[PATCH v3 0/16] backlight updates

[PATCH v3 0/16] backlight updates

[Sam Ravnborg]

v3:
 - Dropped video patch that was reviewd and thus applied
 - Updated kernel-doc so all fields now have a short intro
 - Improved readability in a lot of places, thanks to review
   feedback from Daniel - thanks!
 - Added better intro to backlight
 - Added acks

   Several other smaller changes documented in the
   patches.
   I left out patches to make functions static as
   there are dependencies to drm-misc-next for these.
   When this is landed I have a pile of follow-up patches waiting,
   mostly introducing backlight_is_blank() all over.

v2:
  - Dropped drm patches that was reviewed and thus applied (Thanks Tomi)
  - Updated backligth_is_blank() based on Daniel's feedback
  - Dropped EXPORT_SYMBOL that was no longer relevant
  - Reordered patches, so patches with no external
    dependencies comes first
  - Updated the description that follows.

This following series touches a lot of backlight things.

Starts with a small refactoring in backligth.c to remove some indents.
This increases the readability and no functional changes.

Then a new helper backlight_is_blank() is added.
This helper will simplify the implementation of update_status()
in almost all backlight drivers.

Then while surfing the code I missed some documentation.
So I got a bit carried away and updated the documentation
for the backlight core and added it to kernel-doc.
The documentation express my current understanding.
Everything from spelling errors to outright wrong content
shall be anticipated - so please review!
We are all best helped if the documentation is correct
and up-to-date and it is readable.

In this process I identified that the backlight_bl driver
was no longer in use - so drop it.

Everything builds, but so far no run-time testing.

	Sam

Sam Ravnborg (13):
      backlight: refactor fb_notifier_callback()
      backlight: add backlight_is_blank()
      backlight: improve backlight_ops documentation
      backlight: improve backlight_properties documentation
      backlight: improve backlight_device documentation
      backlight: document inline functions in backlight.h
      backlight: document enums in backlight.h
      backlight: remove the unused backlight_bl driver
      backlight: drop extern from prototypes
      backlight: add overview and update existing doc
      backlight: wire up kernel-doc documentation
      backlight: as3711_bl: introduce backlight_is_blank()
      backlight: use backlight_is_blank() in all backlight drivers

 Documentation/gpu/backlight.rst          |  12 +
 Documentation/gpu/index.rst              |   1 +
 drivers/video/backlight/88pm860x_bl.c    |   8 +-
 drivers/video/backlight/Kconfig          |   8 -
 drivers/video/backlight/Makefile         |   1 -
 drivers/video/backlight/adp5520_bl.c     |   5 +-
 drivers/video/backlight/adp8860_bl.c     |   5 +-
 drivers/video/backlight/adp8870_bl.c     |   5 +-
 drivers/video/backlight/as3711_bl.c      |   8 +-
 drivers/video/backlight/backlight.c      | 174 +++++++++-----
 drivers/video/backlight/bd6107.c         |   4 +-
 drivers/video/backlight/corgi_lcd.c      |   5 +-
 drivers/video/backlight/cr_bllcd.c       |  22 +-
 drivers/video/backlight/da903x_bl.c      |   8 +-
 drivers/video/backlight/ep93xx_bl.c      |   3 +-
 drivers/video/backlight/generic_bl.c     | 110 ---------
 drivers/video/backlight/gpio_backlight.c |   4 +-
 drivers/video/backlight/hp680_bl.c       |   4 +-
 drivers/video/backlight/jornada720_bl.c  |   2 +-
 drivers/video/backlight/kb3886_bl.c      |   4 +-
 drivers/video/backlight/led_bl.c         |   4 +-
 drivers/video/backlight/lm3533_bl.c      |   4 +-
 drivers/video/backlight/locomolcd.c      |   4 +-
 drivers/video/backlight/lv5207lp.c       |   4 +-
 drivers/video/backlight/max8925_bl.c     |   8 +-
 drivers/video/backlight/pwm_bl.c         |   4 +-
 drivers/video/backlight/qcom-wled.c      |   4 +-
 drivers/video/backlight/tps65217_bl.c    |   4 +-
 drivers/video/backlight/wm831x_bl.c      |   8 +-
 include/linux/backlight.h                | 374 +++++++++++++++++++++++++------
 30 files changed, 465 insertions(+), 346 deletions(-)

[PATCH v3 0/16] backlight updates

[Sam Ravnborg]

v3:
 - Dropped video patch that was reviewd and thus applied
 - Updated kernel-doc so all fields now have a short intro
 - Improved readability in a lot of places, thanks to review
   feedback from Daniel - thanks!
 - Added better intro to backlight
 - Added acks

   Several other smaller changes documented in the
   patches.
   I left out patches to make functions static as
   there are dependencies to drm-misc-next for these.
   When this is landed I have a pile of follow-up patches waiting,
   mostly introducing backlight_is_blank() all over.

v2:
  - Dropped drm patches that was reviewed and thus applied (Thanks Tomi)
  - Updated backligth_is_blank() based on Daniel's feedback
  - Dropped EXPORT_SYMBOL that was no longer relevant
  - Reordered patches, so patches with no external
    dependencies comes first
  - Updated the description that follows.

This following series touches a lot of backlight things.

Starts with a small refactoring in backligth.c to remove some indents.
This increases the readability and no functional changes.

Then a new helper backlight_is_blank() is added.
This helper will simplify the implementation of update_status()
in almost all backlight drivers.

Then while surfing the code I missed some documentation.
So I got a bit carried away and updated the documentation
for the backlight core and added it to kernel-doc.
The documentation express my current understanding.
Everything from spelling errors to outright wrong content
shall be anticipated - so please review!
We are all best helped if the documentation is correct
and up-to-date and it is readable.

In this process I identified that the backlight_bl driver
was no longer in use - so drop it.

Everything builds, but so far no run-time testing.

	Sam

Sam Ravnborg (13):
      backlight: refactor fb_notifier_callback()
      backlight: add backlight_is_blank()
      backlight: improve backlight_ops documentation
      backlight: improve backlight_properties documentation
      backlight: improve backlight_device documentation
      backlight: document inline functions in backlight.h
      backlight: document enums in backlight.h
      backlight: remove the unused backlight_bl driver
      backlight: drop extern from prototypes
      backlight: add overview and update existing doc
      backlight: wire up kernel-doc documentation
      backlight: as3711_bl: introduce backlight_is_blank()
      backlight: use backlight_is_blank() in all backlight drivers

 Documentation/gpu/backlight.rst          |  12 +
 Documentation/gpu/index.rst              |   1 +
 drivers/video/backlight/88pm860x_bl.c    |   8 +-
 drivers/video/backlight/Kconfig          |   8 -
 drivers/video/backlight/Makefile         |   1 -
 drivers/video/backlight/adp5520_bl.c     |   5 +-
 drivers/video/backlight/adp8860_bl.c     |   5 +-
 drivers/video/backlight/adp8870_bl.c     |   5 +-
 drivers/video/backlight/as3711_bl.c      |   8 +-
 drivers/video/backlight/backlight.c      | 174 +++++++++-----
 drivers/video/backlight/bd6107.c         |   4 +-
 drivers/video/backlight/corgi_lcd.c      |   5 +-
 drivers/video/backlight/cr_bllcd.c       |  22 +-
 drivers/video/backlight/da903x_bl.c      |   8 +-
 drivers/video/backlight/ep93xx_bl.c      |   3 +-
 drivers/video/backlight/generic_bl.c     | 110 ---------
 drivers/video/backlight/gpio_backlight.c |   4 +-
 drivers/video/backlight/hp680_bl.c       |   4 +-
 drivers/video/backlight/jornada720_bl.c  |   2 +-
 drivers/video/backlight/kb3886_bl.c      |   4 +-
 drivers/video/backlight/led_bl.c         |   4 +-
 drivers/video/backlight/lm3533_bl.c      |   4 +-
 drivers/video/backlight/locomolcd.c      |   4 +-
 drivers/video/backlight/lv5207lp.c       |   4 +-
 drivers/video/backlight/max8925_bl.c     |   8 +-
 drivers/video/backlight/pwm_bl.c         |   4 +-
 drivers/video/backlight/qcom-wled.c      |   4 +-
 drivers/video/backlight/tps65217_bl.c    |   4 +-
 drivers/video/backlight/wm831x_bl.c      |   8 +-
 include/linux/backlight.h                | 374 +++++++++++++++++++++++++------
 30 files changed, 465 insertions(+), 346 deletions(-)

[PATCH v3 0/16] backlight updates

[Sam Ravnborg]

v3:
 - Dropped video patch that was reviewd and thus applied
 - Updated kernel-doc so all fields now have a short intro
 - Improved readability in a lot of places, thanks to review
   feedback from Daniel - thanks!
 - Added better intro to backlight
 - Added acks

   Several other smaller changes documented in the
   patches.
   I left out patches to make functions static as
   there are dependencies to drm-misc-next for these.
   When this is landed I have a pile of follow-up patches waiting,
   mostly introducing backlight_is_blank() all over.

v2:
  - Dropped drm patches that was reviewed and thus applied (Thanks Tomi)
  - Updated backligth_is_blank() based on Daniel's feedback
  - Dropped EXPORT_SYMBOL that was no longer relevant
  - Reordered patches, so patches with no external
    dependencies comes first
  - Updated the description that follows.

This following series touches a lot of backlight things.

Starts with a small refactoring in backligth.c to remove some indents.
This increases the readability and no functional changes.

Then a new helper backlight_is_blank() is added.
This helper will simplify the implementation of update_status()
in almost all backlight drivers.

Then while surfing the code I missed some documentation.
So I got a bit carried away and updated the documentation
for the backlight core and added it to kernel-doc.
The documentation express my current understanding.
Everything from spelling errors to outright wrong content
shall be anticipated - so please review!
We are all best helped if the documentation is correct
and up-to-date and it is readable.

In this process I identified that the backlight_bl driver
was no longer in use - so drop it.

Everything builds, but so far no run-time testing.

	Sam

Sam Ravnborg (13):
      backlight: refactor fb_notifier_callback()
      backlight: add backlight_is_blank()
      backlight: improve backlight_ops documentation
      backlight: improve backlight_properties documentation
      backlight: improve backlight_device documentation
      backlight: document inline functions in backlight.h
      backlight: document enums in backlight.h
      backlight: remove the unused backlight_bl driver
      backlight: drop extern from prototypes
      backlight: add overview and update existing doc
      backlight: wire up kernel-doc documentation
      backlight: as3711_bl: introduce backlight_is_blank()
      backlight: use backlight_is_blank() in all backlight drivers

 Documentation/gpu/backlight.rst          |  12 +
 Documentation/gpu/index.rst              |   1 +
 drivers/video/backlight/88pm860x_bl.c    |   8 +-
 drivers/video/backlight/Kconfig          |   8 -
 drivers/video/backlight/Makefile         |   1 -
 drivers/video/backlight/adp5520_bl.c     |   5 +-
 drivers/video/backlight/adp8860_bl.c     |   5 +-
 drivers/video/backlight/adp8870_bl.c     |   5 +-
 drivers/video/backlight/as3711_bl.c      |   8 +-
 drivers/video/backlight/backlight.c      | 174 +++++++++-----
 drivers/video/backlight/bd6107.c         |   4 +-
 drivers/video/backlight/corgi_lcd.c      |   5 +-
 drivers/video/backlight/cr_bllcd.c       |  22 +-
 drivers/video/backlight/da903x_bl.c      |   8 +-
 drivers/video/backlight/ep93xx_bl.c      |   3 +-
 drivers/video/backlight/generic_bl.c     | 110 ---------
 drivers/video/backlight/gpio_backlight.c |   4 +-
 drivers/video/backlight/hp680_bl.c       |   4 +-
 drivers/video/backlight/jornada720_bl.c  |   2 +-
 drivers/video/backlight/kb3886_bl.c      |   4 +-
 drivers/video/backlight/led_bl.c         |   4 +-
 drivers/video/backlight/lm3533_bl.c      |   4 +-
 drivers/video/backlight/locomolcd.c      |   4 +-
 drivers/video/backlight/lv5207lp.c       |   4 +-
 drivers/video/backlight/max8925_bl.c     |   8 +-
 drivers/video/backlight/pwm_bl.c         |   4 +-
 drivers/video/backlight/qcom-wled.c      |   4 +-
 drivers/video/backlight/tps65217_bl.c    |   4 +-
 drivers/video/backlight/wm831x_bl.c      |   8 +-
 include/linux/backlight.h                | 374 +++++++++++++++++++++++++------
 30 files changed, 465 insertions(+), 346 deletions(-)


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dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v3 01/13] backlight: refactor fb_notifier_callback()

[Sam Ravnborg]

Increase readability of fb_notifier_callback() by removing
a few indent levels.
No functional change.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 drivers/video/backlight/backlight.c | 43 +++++++++++++++--------------
 1 file changed, 22 insertions(+), 21 deletions(-)

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index cac3e35d7630..17f04cff50ab 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -58,28 +58,29 @@ static int fb_notifier_callback(struct notifier_block *self,
 
 	bd = container_of(self, struct backlight_device, fb_notif);
 	mutex_lock(&bd->ops_lock);
-	if (bd->ops)
-		if (!bd->ops->check_fb ||
-		    bd->ops->check_fb(bd, evdata->info)) {
-			fb_blank = *(int *)evdata->data;
-			if (fb_blank == FB_BLANK_UNBLANK &&
-			    !bd->fb_bl_on[node]) {
-				bd->fb_bl_on[node] = true;
-				if (!bd->use_count++) {
-					bd->props.state &= ~BL_CORE_FBBLANK;
-					bd->props.fb_blank = FB_BLANK_UNBLANK;
-					backlight_update_status(bd);
-				}
-			} else if (fb_blank != FB_BLANK_UNBLANK &&
-				   bd->fb_bl_on[node]) {
-				bd->fb_bl_on[node] = false;
-				if (!(--bd->use_count)) {
-					bd->props.state |= BL_CORE_FBBLANK;
-					bd->props.fb_blank = fb_blank;
-					backlight_update_status(bd);
-				}
-			}
+
+	if (!bd->ops)
+		goto out;
+	if (bd->ops->check_fb && !bd->ops->check_fb(bd, evdata->info))
+		goto out;
+
+	fb_blank = *(int *)evdata->data;
+	if (fb_blank == FB_BLANK_UNBLANK && !bd->fb_bl_on[node]) {
+		bd->fb_bl_on[node] = true;
+		if (!bd->use_count++) {
+			bd->props.state &= ~BL_CORE_FBBLANK;
+			bd->props.fb_blank = FB_BLANK_UNBLANK;
+			backlight_update_status(bd);
+		}
+	} else if (fb_blank != FB_BLANK_UNBLANK && bd->fb_bl_on[node]) {
+		bd->fb_bl_on[node] = false;
+		if (!(--bd->use_count)) {
+			bd->props.state |= BL_CORE_FBBLANK;
+			bd->props.fb_blank = fb_blank;
+			backlight_update_status(bd);
 		}
+	}
+out:
 	mutex_unlock(&bd->ops_lock);
 	return 0;
 }
-- 
2.25.1

[PATCH v3 01/13] backlight: refactor fb_notifier_callback()

[Sam Ravnborg]

Increase readability of fb_notifier_callback() by removing
a few indent levels.
No functional change.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 drivers/video/backlight/backlight.c | 43 +++++++++++++++--------------
 1 file changed, 22 insertions(+), 21 deletions(-)

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index cac3e35d7630..17f04cff50ab 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -58,28 +58,29 @@ static int fb_notifier_callback(struct notifier_block *self,
 
 	bd = container_of(self, struct backlight_device, fb_notif);
 	mutex_lock(&bd->ops_lock);
-	if (bd->ops)
-		if (!bd->ops->check_fb ||
-		    bd->ops->check_fb(bd, evdata->info)) {
-			fb_blank = *(int *)evdata->data;
-			if (fb_blank == FB_BLANK_UNBLANK &&
-			    !bd->fb_bl_on[node]) {
-				bd->fb_bl_on[node] = true;
-				if (!bd->use_count++) {
-					bd->props.state &= ~BL_CORE_FBBLANK;
-					bd->props.fb_blank = FB_BLANK_UNBLANK;
-					backlight_update_status(bd);
-				}
-			} else if (fb_blank != FB_BLANK_UNBLANK &&
-				   bd->fb_bl_on[node]) {
-				bd->fb_bl_on[node] = false;
-				if (!(--bd->use_count)) {
-					bd->props.state |= BL_CORE_FBBLANK;
-					bd->props.fb_blank = fb_blank;
-					backlight_update_status(bd);
-				}
-			}
+
+	if (!bd->ops)
+		goto out;
+	if (bd->ops->check_fb && !bd->ops->check_fb(bd, evdata->info))
+		goto out;
+
+	fb_blank = *(int *)evdata->data;
+	if (fb_blank == FB_BLANK_UNBLANK && !bd->fb_bl_on[node]) {
+		bd->fb_bl_on[node] = true;
+		if (!bd->use_count++) {
+			bd->props.state &= ~BL_CORE_FBBLANK;
+			bd->props.fb_blank = FB_BLANK_UNBLANK;
+			backlight_update_status(bd);
+		}
+	} else if (fb_blank != FB_BLANK_UNBLANK && bd->fb_bl_on[node]) {
+		bd->fb_bl_on[node] = false;
+		if (!(--bd->use_count)) {
+			bd->props.state |= BL_CORE_FBBLANK;
+			bd->props.fb_blank = fb_blank;
+			backlight_update_status(bd);
 		}
+	}
+out:
 	mutex_unlock(&bd->ops_lock);
 	return 0;
 }
-- 
2.25.1

[PATCH v3 01/13] backlight: refactor fb_notifier_callback()

[Sam Ravnborg]

Increase readability of fb_notifier_callback() by removing
a few indent levels.
No functional change.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 drivers/video/backlight/backlight.c | 43 +++++++++++++++--------------
 1 file changed, 22 insertions(+), 21 deletions(-)

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index cac3e35d7630..17f04cff50ab 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -58,28 +58,29 @@ static int fb_notifier_callback(struct notifier_block *self,
 
 	bd = container_of(self, struct backlight_device, fb_notif);
 	mutex_lock(&bd->ops_lock);
-	if (bd->ops)
-		if (!bd->ops->check_fb ||
-		    bd->ops->check_fb(bd, evdata->info)) {
-			fb_blank = *(int *)evdata->data;
-			if (fb_blank == FB_BLANK_UNBLANK &&
-			    !bd->fb_bl_on[node]) {
-				bd->fb_bl_on[node] = true;
-				if (!bd->use_count++) {
-					bd->props.state &= ~BL_CORE_FBBLANK;
-					bd->props.fb_blank = FB_BLANK_UNBLANK;
-					backlight_update_status(bd);
-				}
-			} else if (fb_blank != FB_BLANK_UNBLANK &&
-				   bd->fb_bl_on[node]) {
-				bd->fb_bl_on[node] = false;
-				if (!(--bd->use_count)) {
-					bd->props.state |= BL_CORE_FBBLANK;
-					bd->props.fb_blank = fb_blank;
-					backlight_update_status(bd);
-				}
-			}
+
+	if (!bd->ops)
+		goto out;
+	if (bd->ops->check_fb && !bd->ops->check_fb(bd, evdata->info))
+		goto out;
+
+	fb_blank = *(int *)evdata->data;
+	if (fb_blank == FB_BLANK_UNBLANK && !bd->fb_bl_on[node]) {
+		bd->fb_bl_on[node] = true;
+		if (!bd->use_count++) {
+			bd->props.state &= ~BL_CORE_FBBLANK;
+			bd->props.fb_blank = FB_BLANK_UNBLANK;
+			backlight_update_status(bd);
+		}
+	} else if (fb_blank != FB_BLANK_UNBLANK && bd->fb_bl_on[node]) {
+		bd->fb_bl_on[node] = false;
+		if (!(--bd->use_count)) {
+			bd->props.state |= BL_CORE_FBBLANK;
+			bd->props.fb_blank = fb_blank;
+			backlight_update_status(bd);
 		}
+	}
+out:
 	mutex_unlock(&bd->ops_lock);
 	return 0;
 }
-- 
2.25.1

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https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v3 02/13] backlight: add backlight_is_blank()

[Sam Ravnborg]

The backlight support has two properties that express the state:
- power
- state

It is un-documented and easy to get wrong.
Add backlight_is_blank() helper to make it simpler
for drivers to get the check of the state correct.

A lot of drivers also includes checks for fb_blank.
This check is redundant when the state is checked
and thus not needed in this helper function.
But added anyway to avoid introducing subtle bugs
due to the creative use of fb_blank in some drivers.
Introducing this helper will for some drivers results in
added support for fb_blank. This will be a change in
functionality, which will improve the backlight driver.

Rolling out this helper to all relevant backlight drivers
will eliminate almost all accesses to fb_blank.

v3:
  - Clarified that the fb_blank support in
    backlight_is_blank() may result in functionality
    changes for the users (Emil)

v2:
  - Added fb_blank condition (Daniel)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index c7d6b2e8c3b5..a0a083b35c47 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -175,6 +175,25 @@ static inline void backlight_put(struct backlight_device *bd)
 		put_device(&bd->dev);
 }
 
+/**
+ * backlight_is_blank - Return true if display is expected to be blank
+ * @bd: the backlight device
+ *
+ * Display is expected to be blank if any of these is true::
+ *
+ *   1) if power in not UNBLANK
+ *   2) if fb_blank is not UNBLANK
+ *   3) if state indicate BLANK or SUSPENDED
+ *
+ * Returns true if display is expected to be blank, false otherwise.
+ */
+static inline bool backlight_is_blank(struct backlight_device *bd)
+{
+	return bd->props.power != FB_BLANK_UNBLANK ||
+	       bd->props.fb_blank != FB_BLANK_UNBLANK ||
+	       bd->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK);
+}
+
 extern struct backlight_device *backlight_device_register(const char *name,
 	struct device *dev, void *devdata, const struct backlight_ops *ops,
 	const struct backlight_properties *props);
-- 
2.25.1

[PATCH v3 02/13] backlight: add backlight_is_blank()

[Sam Ravnborg]

The backlight support has two properties that express the state:
- power
- state

It is un-documented and easy to get wrong.
Add backlight_is_blank() helper to make it simpler
for drivers to get the check of the state correct.

A lot of drivers also includes checks for fb_blank.
This check is redundant when the state is checked
and thus not needed in this helper function.
But added anyway to avoid introducing subtle bugs
due to the creative use of fb_blank in some drivers.
Introducing this helper will for some drivers results in
added support for fb_blank. This will be a change in
functionality, which will improve the backlight driver.

Rolling out this helper to all relevant backlight drivers
will eliminate almost all accesses to fb_blank.

v3:
  - Clarified that the fb_blank support in
    backlight_is_blank() may result in functionality
    changes for the users (Emil)

v2:
  - Added fb_blank condition (Daniel)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index c7d6b2e8c3b5..a0a083b35c47 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -175,6 +175,25 @@ static inline void backlight_put(struct backlight_device *bd)
 		put_device(&bd->dev);
 }
 
+/**
+ * backlight_is_blank - Return true if display is expected to be blank
+ * @bd: the backlight device
+ *
+ * Display is expected to be blank if any of these is true::
+ *
+ *   1) if power in not UNBLANK
+ *   2) if fb_blank is not UNBLANK
+ *   3) if state indicate BLANK or SUSPENDED
+ *
+ * Returns true if display is expected to be blank, false otherwise.
+ */
+static inline bool backlight_is_blank(struct backlight_device *bd)
+{
+	return bd->props.power != FB_BLANK_UNBLANK ||
+	       bd->props.fb_blank != FB_BLANK_UNBLANK ||
+	       bd->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK);
+}
+
 extern struct backlight_device *backlight_device_register(const char *name,
 	struct device *dev, void *devdata, const struct backlight_ops *ops,
 	const struct backlight_properties *props);
-- 
2.25.1

[PATCH v3 02/13] backlight: add backlight_is_blank()

[Sam Ravnborg]

The backlight support has two properties that express the state:
- power
- state

It is un-documented and easy to get wrong.
Add backlight_is_blank() helper to make it simpler
for drivers to get the check of the state correct.

A lot of drivers also includes checks for fb_blank.
This check is redundant when the state is checked
and thus not needed in this helper function.
But added anyway to avoid introducing subtle bugs
due to the creative use of fb_blank in some drivers.
Introducing this helper will for some drivers results in
added support for fb_blank. This will be a change in
functionality, which will improve the backlight driver.

Rolling out this helper to all relevant backlight drivers
will eliminate almost all accesses to fb_blank.

v3:
  - Clarified that the fb_blank support in
    backlight_is_blank() may result in functionality
    changes for the users (Emil)

v2:
  - Added fb_blank condition (Daniel)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index c7d6b2e8c3b5..a0a083b35c47 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -175,6 +175,25 @@ static inline void backlight_put(struct backlight_device *bd)
 		put_device(&bd->dev);
 }
 
+/**
+ * backlight_is_blank - Return true if display is expected to be blank
+ * @bd: the backlight device
+ *
+ * Display is expected to be blank if any of these is true::
+ *
+ *   1) if power in not UNBLANK
+ *   2) if fb_blank is not UNBLANK
+ *   3) if state indicate BLANK or SUSPENDED
+ *
+ * Returns true if display is expected to be blank, false otherwise.
+ */
+static inline bool backlight_is_blank(struct backlight_device *bd)
+{
+	return bd->props.power != FB_BLANK_UNBLANK ||
+	       bd->props.fb_blank != FB_BLANK_UNBLANK ||
+	       bd->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK);
+}
+
 extern struct backlight_device *backlight_device_register(const char *name,
 	struct device *dev, void *devdata, const struct backlight_ops *ops,
 	const struct backlight_properties *props);
-- 
2.25.1

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v3 03/13] backlight: improve backlight_ops documentation

[Sam Ravnborg]

Improve the documentation for backlight_ops and
adapt it to kernel-doc style.

v2:
  - Add intro for each field (Daniel)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 59 +++++++++++++++++++++++++++++++++++----
 1 file changed, 53 insertions(+), 6 deletions(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index a0a083b35c47..b6c1ab6c922a 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -55,19 +55,66 @@ enum backlight_scale {
 struct backlight_device;
 struct fb_info;
 
+/**
+ * struct backlight_ops - backlight operations
+ *
+ * The backlight operations are specifed when the backlight device is registered.
+ */
 struct backlight_ops {
+	/**
+	 * @options: Configure how operations are called from the core.
+	 *
+	 * The options parameter is used to adjust the behaviour of the core.
+	 * Set BL_CORE_SUSPENDRESUME to get the update_status() operation called
+	 * upon suspend and resume.
+	 */
 	unsigned int options;
 
 #define BL_CORE_SUSPENDRESUME	(1 << 0)
 
-	/* Notify the backlight driver some property has changed */
+	/**
+	 * @update_status: Operation called when properties have changed.
+	 *
+	 * Notify the backlight driver some property has changed.
+	 * The update_status operation is protected by the update_lock.
+	 *
+	 * The backlight driver is expected to use backlight_is_blank()
+	 * to check if the display is blanked and set brightness accordingly.
+	 * update_status() is called when any of the properties has changed.
+	 *
+	 * RETURNS:
+	 *
+	 * 0 on sucees, negative error code if any failure occured.
+	 */
 	int (*update_status)(struct backlight_device *);
-	/* Return the current backlight brightness (accounting for power,
-	   fb_blank etc.) */
+
+	/**
+	 * @get_brightness: Return the current backlight brightness.
+	 *
+	 * The driver may implement this as a readback from the HW.
+	 * This operation is optional and if not present then the current
+	 * brightness property value is used.
+	 *
+	 * RETURNS:
+	 *
+	 * A brightness value which is 0 or a positive numer.
+	 * On failure a negative error code is returned.
+	 */
 	int (*get_brightness)(struct backlight_device *);
-	/* Check if given framebuffer device is the one bound to this backlight;
-	   return 0 if not, !=0 if it is. If NULL, backlight always matches the fb. */
-	int (*check_fb)(struct backlight_device *, struct fb_info *);
+
+	/**
+	 * @check_fb: Check the framebuffer device.
+	 *
+	 * Check if given framebuffer device is the one bound to this backlight.
+	 * This operation is optional and if not implemented it is assumed that the
+	 * fbdev is always the one bound to the backlight.
+	 *
+	 * RETURNS:
+	 *
+	 * If info is NULL or the info matches the fbdev bound to the backlight return true.
+	 * If info does not match the fbdev bound to the backlight return false.
+	 */
+	int (*check_fb)(struct backlight_device *bd, struct fb_info *info);
 };
 
 /* This structure defines all the properties of a backlight */
-- 
2.25.1

[PATCH v3 03/13] backlight: improve backlight_ops documentation

[Sam Ravnborg]

Improve the documentation for backlight_ops and
adapt it to kernel-doc style.

v2:
  - Add intro for each field (Daniel)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 59 +++++++++++++++++++++++++++++++++++----
 1 file changed, 53 insertions(+), 6 deletions(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index a0a083b35c47..b6c1ab6c922a 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -55,19 +55,66 @@ enum backlight_scale {
 struct backlight_device;
 struct fb_info;
 
+/**
+ * struct backlight_ops - backlight operations
+ *
+ * The backlight operations are specifed when the backlight device is registered.
+ */
 struct backlight_ops {
+	/**
+	 * @options: Configure how operations are called from the core.
+	 *
+	 * The options parameter is used to adjust the behaviour of the core.
+	 * Set BL_CORE_SUSPENDRESUME to get the update_status() operation called
+	 * upon suspend and resume.
+	 */
 	unsigned int options;
 
 #define BL_CORE_SUSPENDRESUME	(1 << 0)
 
-	/* Notify the backlight driver some property has changed */
+	/**
+	 * @update_status: Operation called when properties have changed.
+	 *
+	 * Notify the backlight driver some property has changed.
+	 * The update_status operation is protected by the update_lock.
+	 *
+	 * The backlight driver is expected to use backlight_is_blank()
+	 * to check if the display is blanked and set brightness accordingly.
+	 * update_status() is called when any of the properties has changed.
+	 *
+	 * RETURNS:
+	 *
+	 * 0 on sucees, negative error code if any failure occured.
+	 */
 	int (*update_status)(struct backlight_device *);
-	/* Return the current backlight brightness (accounting for power,
-	   fb_blank etc.) */
+
+	/**
+	 * @get_brightness: Return the current backlight brightness.
+	 *
+	 * The driver may implement this as a readback from the HW.
+	 * This operation is optional and if not present then the current
+	 * brightness property value is used.
+	 *
+	 * RETURNS:
+	 *
+	 * A brightness value which is 0 or a positive numer.
+	 * On failure a negative error code is returned.
+	 */
 	int (*get_brightness)(struct backlight_device *);
-	/* Check if given framebuffer device is the one bound to this backlight;
-	   return 0 if not, !=0 if it is. If NULL, backlight always matches the fb. */
-	int (*check_fb)(struct backlight_device *, struct fb_info *);
+
+	/**
+	 * @check_fb: Check the framebuffer device.
+	 *
+	 * Check if given framebuffer device is the one bound to this backlight.
+	 * This operation is optional and if not implemented it is assumed that the
+	 * fbdev is always the one bound to the backlight.
+	 *
+	 * RETURNS:
+	 *
+	 * If info is NULL or the info matches the fbdev bound to the backlight return true.
+	 * If info does not match the fbdev bound to the backlight return false.
+	 */
+	int (*check_fb)(struct backlight_device *bd, struct fb_info *info);
 };
 
 /* This structure defines all the properties of a backlight */
-- 
2.25.1

[PATCH v3 03/13] backlight: improve backlight_ops documentation

[Sam Ravnborg]

Improve the documentation for backlight_ops and
adapt it to kernel-doc style.

v2:
  - Add intro for each field (Daniel)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 59 +++++++++++++++++++++++++++++++++++----
 1 file changed, 53 insertions(+), 6 deletions(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index a0a083b35c47..b6c1ab6c922a 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -55,19 +55,66 @@ enum backlight_scale {
 struct backlight_device;
 struct fb_info;
 
+/**
+ * struct backlight_ops - backlight operations
+ *
+ * The backlight operations are specifed when the backlight device is registered.
+ */
 struct backlight_ops {
+	/**
+	 * @options: Configure how operations are called from the core.
+	 *
+	 * The options parameter is used to adjust the behaviour of the core.
+	 * Set BL_CORE_SUSPENDRESUME to get the update_status() operation called
+	 * upon suspend and resume.
+	 */
 	unsigned int options;
 
 #define BL_CORE_SUSPENDRESUME	(1 << 0)
 
-	/* Notify the backlight driver some property has changed */
+	/**
+	 * @update_status: Operation called when properties have changed.
+	 *
+	 * Notify the backlight driver some property has changed.
+	 * The update_status operation is protected by the update_lock.
+	 *
+	 * The backlight driver is expected to use backlight_is_blank()
+	 * to check if the display is blanked and set brightness accordingly.
+	 * update_status() is called when any of the properties has changed.
+	 *
+	 * RETURNS:
+	 *
+	 * 0 on sucees, negative error code if any failure occured.
+	 */
 	int (*update_status)(struct backlight_device *);
-	/* Return the current backlight brightness (accounting for power,
-	   fb_blank etc.) */
+
+	/**
+	 * @get_brightness: Return the current backlight brightness.
+	 *
+	 * The driver may implement this as a readback from the HW.
+	 * This operation is optional and if not present then the current
+	 * brightness property value is used.
+	 *
+	 * RETURNS:
+	 *
+	 * A brightness value which is 0 or a positive numer.
+	 * On failure a negative error code is returned.
+	 */
 	int (*get_brightness)(struct backlight_device *);
-	/* Check if given framebuffer device is the one bound to this backlight;
-	   return 0 if not, !=0 if it is. If NULL, backlight always matches the fb. */
-	int (*check_fb)(struct backlight_device *, struct fb_info *);
+
+	/**
+	 * @check_fb: Check the framebuffer device.
+	 *
+	 * Check if given framebuffer device is the one bound to this backlight.
+	 * This operation is optional and if not implemented it is assumed that the
+	 * fbdev is always the one bound to the backlight.
+	 *
+	 * RETURNS:
+	 *
+	 * If info is NULL or the info matches the fbdev bound to the backlight return true.
+	 * If info does not match the fbdev bound to the backlight return false.
+	 */
+	int (*check_fb)(struct backlight_device *bd, struct fb_info *info);
 };
 
 /* This structure defines all the properties of a backlight */
-- 
2.25.1

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v3 04/13] backlight: improve backlight_properties documentation

[Sam Ravnborg]

Improve the documentation for backlight_properties and
adapt it to kernel-doc style.

v2:
  - Added into for each field (Daniel)
  - Re-written some parts to explain what to do, rather
    than what not to do.
    Partly based on suggestions from the review (Daniel)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 96 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 85 insertions(+), 11 deletions(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index b6c1ab6c922a..69a20da03035 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -117,28 +117,102 @@ struct backlight_ops {
 	int (*check_fb)(struct backlight_device *bd, struct fb_info *info);
 };
 
-/* This structure defines all the properties of a backlight */
+/**
+ * struct backlight_properties - backlight properties
+ *
+ * This structure defines all the properties of a backlight.
+ */
 struct backlight_properties {
-	/* Current User requested brightness (0 - max_brightness) */
+	/**
+	 * @brightness: The current brightness requested by the user.
+	 *
+	 * The backlight core makes sure the range is (0 to max_brightness)
+	 * when the brightness is set via the sysfs attribute:
+	 * /sys/class/backlight/<backlight>/brightness.
+	 *
+	 * This value can be set in the backlight_properties passed
+	 * to devm_backlight_device_register() to set a default brightness
+	 * value.
+	 */
 	int brightness;
-	/* Maximal value for brightness (read-only) */
+
+	/**
+	 * @max_brightness: The maximum brightness value.
+	 *
+	 * This value must be set in the backlight_properties passed to
+	 * devm_backlight_device_register() and shall not be modified by the
+	 * driver after registration.
+	 */
 	int max_brightness;
-	/* Current FB Power mode (0: full on, 1..3: power saving
-	   modes; 4: full off), see FB_BLANK_XXX */
+
+	/**
+	 * @power: The current power mode.
+	 *
+	 * User space can configure the power mode using the sysfs
+	 * attribute: /sys/class/backlight/<backlight>/bl_power
+	 * When the power property is updated update_status() is called.
+	 *
+	 * The possible values are: (0: full on, 1 to 3: power saving
+	 * modes; 4: full off), see FB_BLANK_XXX.
+	 *
+	 * When the backlight device is enabled @power is set
+	 * to FB_BLANK_UNBLANK. When the backlight device is disabled
+	 * @power is set to FB_BLANK_POWERDOWN.
+	 */
 	int power;
-	/* FB Blanking active? (values as for power) */
-	/* Due to be removed, please use (state & BL_CORE_FBBLANK) */
+
+	/**
+	 * @fb_blank: The power state from the FBIOBLANK ioclt.
+	 *
+	 * When the FBIOBLANK ioctl is called fb_blank is set to the
+	 * blank parameter and the update_status() operation is called.
+	 *
+	 * When the backlight device is enabled @fb_blank is set
+	 * to FB_BLANK_UNBLANK. When the backlight device is disabled
+	 * @fb_blank is set to FB_BLANK_POWERDOWN.
+	 *
+	 * Backlight drivers should avoid using this property. It has been
+	 * replaced by state & BL_CORE_FBLANK (although most drivers should
+	 * use backlight_is_blank() as the preferred means to get the blank
+	 * state).
+	 *
+	 * fb_blank is deprecated and will be removed.
+	 */
 	int fb_blank;
-	/* Backlight type */
+
+	/**
+	 * @type: The type of backlight supported.
+	 *
+	 * The backlight type allows userspace to make appropriate
+	 * policy desicions based on the backlight type.
+	 *
+	 * This value must be set in the backlight_properties
+	 * passed to devm_backlight_device_register().
+	 */
 	enum backlight_type type;
-	/* Flags used to signal drivers of state changes */
+
+	/**
+	 * @state: The state of the backlight core.
+	 *
+	 * The state is a bitmask. BL_CORE_FBBLANK is set when the display
+	 * is expected to be blank. BL_CORE_SUSPENDED is set when the
+	 * driver is suspended.
+	 *
+	 * backlight drivers are excpected to use backlight_is_blank()
+	 * in their update_status() operation rather than reading the
+	 * state property.
+	 *
+	 * The state is maintained by the core and drivers may not modify it.
+	 */
 	unsigned int state;
-	/* Type of the brightness scale (linear, non-linear, ...) */
-	enum backlight_scale scale;
 
 #define BL_CORE_SUSPENDED	(1 << 0)	/* backlight is suspended */
 #define BL_CORE_FBBLANK		(1 << 1)	/* backlight is under an fb blank event */
 
+	/**
+	 * @scale: The type of the brightness scale.
+	 */
+	enum backlight_scale scale;
 };
 
 struct backlight_device {
-- 
2.25.1

[PATCH v3 04/13] backlight: improve backlight_properties documentation

[Sam Ravnborg]

Improve the documentation for backlight_properties and
adapt it to kernel-doc style.

v2:
  - Added into for each field (Daniel)
  - Re-written some parts to explain what to do, rather
    than what not to do.
    Partly based on suggestions from the review (Daniel)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 96 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 85 insertions(+), 11 deletions(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index b6c1ab6c922a..69a20da03035 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -117,28 +117,102 @@ struct backlight_ops {
 	int (*check_fb)(struct backlight_device *bd, struct fb_info *info);
 };
 
-/* This structure defines all the properties of a backlight */
+/**
+ * struct backlight_properties - backlight properties
+ *
+ * This structure defines all the properties of a backlight.
+ */
 struct backlight_properties {
-	/* Current User requested brightness (0 - max_brightness) */
+	/**
+	 * @brightness: The current brightness requested by the user.
+	 *
+	 * The backlight core makes sure the range is (0 to max_brightness)
+	 * when the brightness is set via the sysfs attribute:
+	 * /sys/class/backlight/<backlight>/brightness.
+	 *
+	 * This value can be set in the backlight_properties passed
+	 * to devm_backlight_device_register() to set a default brightness
+	 * value.
+	 */
 	int brightness;
-	/* Maximal value for brightness (read-only) */
+
+	/**
+	 * @max_brightness: The maximum brightness value.
+	 *
+	 * This value must be set in the backlight_properties passed to
+	 * devm_backlight_device_register() and shall not be modified by the
+	 * driver after registration.
+	 */
 	int max_brightness;
-	/* Current FB Power mode (0: full on, 1..3: power saving
-	   modes; 4: full off), see FB_BLANK_XXX */
+
+	/**
+	 * @power: The current power mode.
+	 *
+	 * User space can configure the power mode using the sysfs
+	 * attribute: /sys/class/backlight/<backlight>/bl_power
+	 * When the power property is updated update_status() is called.
+	 *
+	 * The possible values are: (0: full on, 1 to 3: power saving
+	 * modes; 4: full off), see FB_BLANK_XXX.
+	 *
+	 * When the backlight device is enabled @power is set
+	 * to FB_BLANK_UNBLANK. When the backlight device is disabled
+	 * @power is set to FB_BLANK_POWERDOWN.
+	 */
 	int power;
-	/* FB Blanking active? (values as for power) */
-	/* Due to be removed, please use (state & BL_CORE_FBBLANK) */
+
+	/**
+	 * @fb_blank: The power state from the FBIOBLANK ioclt.
+	 *
+	 * When the FBIOBLANK ioctl is called fb_blank is set to the
+	 * blank parameter and the update_status() operation is called.
+	 *
+	 * When the backlight device is enabled @fb_blank is set
+	 * to FB_BLANK_UNBLANK. When the backlight device is disabled
+	 * @fb_blank is set to FB_BLANK_POWERDOWN.
+	 *
+	 * Backlight drivers should avoid using this property. It has been
+	 * replaced by state & BL_CORE_FBLANK (although most drivers should
+	 * use backlight_is_blank() as the preferred means to get the blank
+	 * state).
+	 *
+	 * fb_blank is deprecated and will be removed.
+	 */
 	int fb_blank;
-	/* Backlight type */
+
+	/**
+	 * @type: The type of backlight supported.
+	 *
+	 * The backlight type allows userspace to make appropriate
+	 * policy desicions based on the backlight type.
+	 *
+	 * This value must be set in the backlight_properties
+	 * passed to devm_backlight_device_register().
+	 */
 	enum backlight_type type;
-	/* Flags used to signal drivers of state changes */
+
+	/**
+	 * @state: The state of the backlight core.
+	 *
+	 * The state is a bitmask. BL_CORE_FBBLANK is set when the display
+	 * is expected to be blank. BL_CORE_SUSPENDED is set when the
+	 * driver is suspended.
+	 *
+	 * backlight drivers are excpected to use backlight_is_blank()
+	 * in their update_status() operation rather than reading the
+	 * state property.
+	 *
+	 * The state is maintained by the core and drivers may not modify it.
+	 */
 	unsigned int state;
-	/* Type of the brightness scale (linear, non-linear, ...) */
-	enum backlight_scale scale;
 
 #define BL_CORE_SUSPENDED	(1 << 0)	/* backlight is suspended */
 #define BL_CORE_FBBLANK		(1 << 1)	/* backlight is under an fb blank event */
 
+	/**
+	 * @scale: The type of the brightness scale.
+	 */
+	enum backlight_scale scale;
 };
 
 struct backlight_device {
-- 
2.25.1

[PATCH v3 04/13] backlight: improve backlight_properties documentation

[Sam Ravnborg]

Improve the documentation for backlight_properties and
adapt it to kernel-doc style.

v2:
  - Added into for each field (Daniel)
  - Re-written some parts to explain what to do, rather
    than what not to do.
    Partly based on suggestions from the review (Daniel)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 96 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 85 insertions(+), 11 deletions(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index b6c1ab6c922a..69a20da03035 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -117,28 +117,102 @@ struct backlight_ops {
 	int (*check_fb)(struct backlight_device *bd, struct fb_info *info);
 };
 
-/* This structure defines all the properties of a backlight */
+/**
+ * struct backlight_properties - backlight properties
+ *
+ * This structure defines all the properties of a backlight.
+ */
 struct backlight_properties {
-	/* Current User requested brightness (0 - max_brightness) */
+	/**
+	 * @brightness: The current brightness requested by the user.
+	 *
+	 * The backlight core makes sure the range is (0 to max_brightness)
+	 * when the brightness is set via the sysfs attribute:
+	 * /sys/class/backlight/<backlight>/brightness.
+	 *
+	 * This value can be set in the backlight_properties passed
+	 * to devm_backlight_device_register() to set a default brightness
+	 * value.
+	 */
 	int brightness;
-	/* Maximal value for brightness (read-only) */
+
+	/**
+	 * @max_brightness: The maximum brightness value.
+	 *
+	 * This value must be set in the backlight_properties passed to
+	 * devm_backlight_device_register() and shall not be modified by the
+	 * driver after registration.
+	 */
 	int max_brightness;
-	/* Current FB Power mode (0: full on, 1..3: power saving
-	   modes; 4: full off), see FB_BLANK_XXX */
+
+	/**
+	 * @power: The current power mode.
+	 *
+	 * User space can configure the power mode using the sysfs
+	 * attribute: /sys/class/backlight/<backlight>/bl_power
+	 * When the power property is updated update_status() is called.
+	 *
+	 * The possible values are: (0: full on, 1 to 3: power saving
+	 * modes; 4: full off), see FB_BLANK_XXX.
+	 *
+	 * When the backlight device is enabled @power is set
+	 * to FB_BLANK_UNBLANK. When the backlight device is disabled
+	 * @power is set to FB_BLANK_POWERDOWN.
+	 */
 	int power;
-	/* FB Blanking active? (values as for power) */
-	/* Due to be removed, please use (state & BL_CORE_FBBLANK) */
+
+	/**
+	 * @fb_blank: The power state from the FBIOBLANK ioclt.
+	 *
+	 * When the FBIOBLANK ioctl is called fb_blank is set to the
+	 * blank parameter and the update_status() operation is called.
+	 *
+	 * When the backlight device is enabled @fb_blank is set
+	 * to FB_BLANK_UNBLANK. When the backlight device is disabled
+	 * @fb_blank is set to FB_BLANK_POWERDOWN.
+	 *
+	 * Backlight drivers should avoid using this property. It has been
+	 * replaced by state & BL_CORE_FBLANK (although most drivers should
+	 * use backlight_is_blank() as the preferred means to get the blank
+	 * state).
+	 *
+	 * fb_blank is deprecated and will be removed.
+	 */
 	int fb_blank;
-	/* Backlight type */
+
+	/**
+	 * @type: The type of backlight supported.
+	 *
+	 * The backlight type allows userspace to make appropriate
+	 * policy desicions based on the backlight type.
+	 *
+	 * This value must be set in the backlight_properties
+	 * passed to devm_backlight_device_register().
+	 */
 	enum backlight_type type;
-	/* Flags used to signal drivers of state changes */
+
+	/**
+	 * @state: The state of the backlight core.
+	 *
+	 * The state is a bitmask. BL_CORE_FBBLANK is set when the display
+	 * is expected to be blank. BL_CORE_SUSPENDED is set when the
+	 * driver is suspended.
+	 *
+	 * backlight drivers are excpected to use backlight_is_blank()
+	 * in their update_status() operation rather than reading the
+	 * state property.
+	 *
+	 * The state is maintained by the core and drivers may not modify it.
+	 */
 	unsigned int state;
-	/* Type of the brightness scale (linear, non-linear, ...) */
-	enum backlight_scale scale;
 
 #define BL_CORE_SUSPENDED	(1 << 0)	/* backlight is suspended */
 #define BL_CORE_FBBLANK		(1 << 1)	/* backlight is under an fb blank event */
 
+	/**
+	 * @scale: The type of the brightness scale.
+	 */
+	enum backlight_scale scale;
 };
 
 struct backlight_device {
-- 
2.25.1

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[PATCH v3 05/13] backlight: improve backlight_device documentation

[Sam Ravnborg]

Improve the documentation for backlight_device and
adapt it to kernel-doc style.

v2:
  - Add short intro to all fields (Daniel)
  - Updated description of update_lock (Daniel)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 72 ++++++++++++++++++++++++++-------------
 1 file changed, 49 insertions(+), 23 deletions(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 69a20da03035..cae1af95dd9d 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -14,21 +14,6 @@
 #include <linux/mutex.h>
 #include <linux/notifier.h>
 
-/* Notes on locking:
- *
- * backlight_device->ops_lock is an internal backlight lock protecting the
- * ops pointer and no code outside the core should need to touch it.
- *
- * Access to update_status() is serialised by the update_lock mutex since
- * most drivers seem to need this and historically get it wrong.
- *
- * Most drivers don't need locking on their get_brightness() method.
- * If yours does, you need to implement it in the driver. You can use the
- * update_lock mutex if appropriate.
- *
- * Any other use of the locks below is probably wrong.
- */
-
 enum backlight_update_reason {
 	BACKLIGHT_UPDATE_HOTKEY,
 	BACKLIGHT_UPDATE_SYSFS,
@@ -215,30 +200,71 @@ struct backlight_properties {
 	enum backlight_scale scale;
 };
 
+/**
+ * struct backlight_device - backlight device data
+ *
+ * This structure holds all data required by a backlight device.
+ */
 struct backlight_device {
-	/* Backlight properties */
+	/**
+	 * @props: Backlight properties
+	 */
 	struct backlight_properties props;
 
-	/* Serialise access to update_status method */
+	/**
+	 * @update_lock: The lock used when calling the update_status() operation.
+	 *
+	 * update_lock is an internal backlight lock that serialise access
+	 * to the update_status() operation. The backlight core holds the update_lock
+	 * when calling the update_status() operation. The update_lock shall not
+	 * be used by backlight drivers.
+	 */
 	struct mutex update_lock;
 
-	/* This protects the 'ops' field. If 'ops' is NULL, the driver that
-	   registered this device has been unloaded, and if class_get_devdata()
-	   points to something in the body of that driver, it is also invalid. */
+	/**
+	 * @ops_lock: The lock used around everything related to backlight_ops.
+	 *
+	 * ops_lock is an internal backlight lock that protects the ops pointer
+	 * and is used around all accesses to ops and when the operations are
+	 * invoked. The ops_lock shall not be used by backlight drivers.
+	 */
 	struct mutex ops_lock;
+
+	/**
+	 * @ops: Pointer to the backlight operations.
+	 *
+	 * If ops is NULL, the driver that registered this device has been unloaded,
+	 * and if class_get_devdata() points to something in the body of that driver,
+	 * it is also invalid.
+	 */
 	const struct backlight_ops *ops;
 
-	/* The framebuffer notifier block */
+	/**
+	 * @fb_notif: The framebuffer notifier block
+	 */
 	struct notifier_block fb_notif;
 
-	/* list entry of all registered backlight devices */
+	/**
+	 * @entry: List entry of all registered backlight devices
+	 */
 	struct list_head entry;
 
+	/**
+	 * @dev: Parent device.
+	 */
 	struct device dev;
 
-	/* Multiple framebuffers may share one backlight device */
+	/**
+	 * @fb_bl_on: The state of individual fbdev's.
+	 *
+	 * Multiple fbdev's may share one backlight device. The fb_bl_on
+	 * records the state of the individual fbdev.
+	 */
 	bool fb_bl_on[FB_MAX];
 
+	/**
+	 * @use_count: The number of uses of fb_bl_on.
+	 */
 	int use_count;
 };
 
-- 
2.25.1

[PATCH v3 05/13] backlight: improve backlight_device documentation

[Sam Ravnborg]

Improve the documentation for backlight_device and
adapt it to kernel-doc style.

v2:
  - Add short intro to all fields (Daniel)
  - Updated description of update_lock (Daniel)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 72 ++++++++++++++++++++++++++-------------
 1 file changed, 49 insertions(+), 23 deletions(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 69a20da03035..cae1af95dd9d 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -14,21 +14,6 @@
 #include <linux/mutex.h>
 #include <linux/notifier.h>
 
-/* Notes on locking:
- *
- * backlight_device->ops_lock is an internal backlight lock protecting the
- * ops pointer and no code outside the core should need to touch it.
- *
- * Access to update_status() is serialised by the update_lock mutex since
- * most drivers seem to need this and historically get it wrong.
- *
- * Most drivers don't need locking on their get_brightness() method.
- * If yours does, you need to implement it in the driver. You can use the
- * update_lock mutex if appropriate.
- *
- * Any other use of the locks below is probably wrong.
- */
-
 enum backlight_update_reason {
 	BACKLIGHT_UPDATE_HOTKEY,
 	BACKLIGHT_UPDATE_SYSFS,
@@ -215,30 +200,71 @@ struct backlight_properties {
 	enum backlight_scale scale;
 };
 
+/**
+ * struct backlight_device - backlight device data
+ *
+ * This structure holds all data required by a backlight device.
+ */
 struct backlight_device {
-	/* Backlight properties */
+	/**
+	 * @props: Backlight properties
+	 */
 	struct backlight_properties props;
 
-	/* Serialise access to update_status method */
+	/**
+	 * @update_lock: The lock used when calling the update_status() operation.
+	 *
+	 * update_lock is an internal backlight lock that serialise access
+	 * to the update_status() operation. The backlight core holds the update_lock
+	 * when calling the update_status() operation. The update_lock shall not
+	 * be used by backlight drivers.
+	 */
 	struct mutex update_lock;
 
-	/* This protects the 'ops' field. If 'ops' is NULL, the driver that
-	   registered this device has been unloaded, and if class_get_devdata()
-	   points to something in the body of that driver, it is also invalid. */
+	/**
+	 * @ops_lock: The lock used around everything related to backlight_ops.
+	 *
+	 * ops_lock is an internal backlight lock that protects the ops pointer
+	 * and is used around all accesses to ops and when the operations are
+	 * invoked. The ops_lock shall not be used by backlight drivers.
+	 */
 	struct mutex ops_lock;
+
+	/**
+	 * @ops: Pointer to the backlight operations.
+	 *
+	 * If ops is NULL, the driver that registered this device has been unloaded,
+	 * and if class_get_devdata() points to something in the body of that driver,
+	 * it is also invalid.
+	 */
 	const struct backlight_ops *ops;
 
-	/* The framebuffer notifier block */
+	/**
+	 * @fb_notif: The framebuffer notifier block
+	 */
 	struct notifier_block fb_notif;
 
-	/* list entry of all registered backlight devices */
+	/**
+	 * @entry: List entry of all registered backlight devices
+	 */
 	struct list_head entry;
 
+	/**
+	 * @dev: Parent device.
+	 */
 	struct device dev;
 
-	/* Multiple framebuffers may share one backlight device */
+	/**
+	 * @fb_bl_on: The state of individual fbdev's.
+	 *
+	 * Multiple fbdev's may share one backlight device. The fb_bl_on
+	 * records the state of the individual fbdev.
+	 */
 	bool fb_bl_on[FB_MAX];
 
+	/**
+	 * @use_count: The number of uses of fb_bl_on.
+	 */
 	int use_count;
 };
 
-- 
2.25.1

[PATCH v3 05/13] backlight: improve backlight_device documentation

[Sam Ravnborg]

Improve the documentation for backlight_device and
adapt it to kernel-doc style.

v2:
  - Add short intro to all fields (Daniel)
  - Updated description of update_lock (Daniel)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 72 ++++++++++++++++++++++++++-------------
 1 file changed, 49 insertions(+), 23 deletions(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 69a20da03035..cae1af95dd9d 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -14,21 +14,6 @@
 #include <linux/mutex.h>
 #include <linux/notifier.h>
 
-/* Notes on locking:
- *
- * backlight_device->ops_lock is an internal backlight lock protecting the
- * ops pointer and no code outside the core should need to touch it.
- *
- * Access to update_status() is serialised by the update_lock mutex since
- * most drivers seem to need this and historically get it wrong.
- *
- * Most drivers don't need locking on their get_brightness() method.
- * If yours does, you need to implement it in the driver. You can use the
- * update_lock mutex if appropriate.
- *
- * Any other use of the locks below is probably wrong.
- */
-
 enum backlight_update_reason {
 	BACKLIGHT_UPDATE_HOTKEY,
 	BACKLIGHT_UPDATE_SYSFS,
@@ -215,30 +200,71 @@ struct backlight_properties {
 	enum backlight_scale scale;
 };
 
+/**
+ * struct backlight_device - backlight device data
+ *
+ * This structure holds all data required by a backlight device.
+ */
 struct backlight_device {
-	/* Backlight properties */
+	/**
+	 * @props: Backlight properties
+	 */
 	struct backlight_properties props;
 
-	/* Serialise access to update_status method */
+	/**
+	 * @update_lock: The lock used when calling the update_status() operation.
+	 *
+	 * update_lock is an internal backlight lock that serialise access
+	 * to the update_status() operation. The backlight core holds the update_lock
+	 * when calling the update_status() operation. The update_lock shall not
+	 * be used by backlight drivers.
+	 */
 	struct mutex update_lock;
 
-	/* This protects the 'ops' field. If 'ops' is NULL, the driver that
-	   registered this device has been unloaded, and if class_get_devdata()
-	   points to something in the body of that driver, it is also invalid. */
+	/**
+	 * @ops_lock: The lock used around everything related to backlight_ops.
+	 *
+	 * ops_lock is an internal backlight lock that protects the ops pointer
+	 * and is used around all accesses to ops and when the operations are
+	 * invoked. The ops_lock shall not be used by backlight drivers.
+	 */
 	struct mutex ops_lock;
+
+	/**
+	 * @ops: Pointer to the backlight operations.
+	 *
+	 * If ops is NULL, the driver that registered this device has been unloaded,
+	 * and if class_get_devdata() points to something in the body of that driver,
+	 * it is also invalid.
+	 */
 	const struct backlight_ops *ops;
 
-	/* The framebuffer notifier block */
+	/**
+	 * @fb_notif: The framebuffer notifier block
+	 */
 	struct notifier_block fb_notif;
 
-	/* list entry of all registered backlight devices */
+	/**
+	 * @entry: List entry of all registered backlight devices
+	 */
 	struct list_head entry;
 
+	/**
+	 * @dev: Parent device.
+	 */
 	struct device dev;
 
-	/* Multiple framebuffers may share one backlight device */
+	/**
+	 * @fb_bl_on: The state of individual fbdev's.
+	 *
+	 * Multiple fbdev's may share one backlight device. The fb_bl_on
+	 * records the state of the individual fbdev.
+	 */
 	bool fb_bl_on[FB_MAX];
 
+	/**
+	 * @use_count: The number of uses of fb_bl_on.
+	 */
 	int use_count;
 };
 
-- 
2.25.1

_______________________________________________
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[PATCH v3 06/13] backlight: document inline functions in backlight.h

[Sam Ravnborg]

Add documentation for the inline functions in backlight.h

v2:
 - Fix spelling (Daniel)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index cae1af95dd9d..f99ca19cc3ec 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -268,6 +268,10 @@ struct backlight_device {
 	int use_count;
 };
 
+/**
+ * backlight_update_status - force an update of the backlight device status
+ * @bd: the backlight device
+ */
 static inline int backlight_update_status(struct backlight_device *bd)
 {
 	int ret = -ENOENT;
@@ -360,6 +364,18 @@ extern int backlight_device_set_brightness(struct backlight_device *bd, unsigned
 
 #define to_backlight_device(obj) container_of(obj, struct backlight_device, dev)
 
+/**
+ * bl_get_data - access devdata
+ * @bl_dev: pointer to backlight device
+ *
+ * When a backlight device is registered the driver has the possibility
+ * to supply a void * devdata. bl_get_data() return a pointer to the
+ * devdata.
+ *
+ * RETURNS:
+ *
+ * pointer to devdata stored while registering the backlight device.
+ */
 static inline void * bl_get_data(struct backlight_device *bl_dev)
 {
 	return dev_get_drvdata(&bl_dev->dev);
-- 
2.25.1

[PATCH v3 06/13] backlight: document inline functions in backlight.h

[Sam Ravnborg]

Add documentation for the inline functions in backlight.h

v2:
 - Fix spelling (Daniel)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index cae1af95dd9d..f99ca19cc3ec 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -268,6 +268,10 @@ struct backlight_device {
 	int use_count;
 };
 
+/**
+ * backlight_update_status - force an update of the backlight device status
+ * @bd: the backlight device
+ */
 static inline int backlight_update_status(struct backlight_device *bd)
 {
 	int ret = -ENOENT;
@@ -360,6 +364,18 @@ extern int backlight_device_set_brightness(struct backlight_device *bd, unsigned
 
 #define to_backlight_device(obj) container_of(obj, struct backlight_device, dev)
 
+/**
+ * bl_get_data - access devdata
+ * @bl_dev: pointer to backlight device
+ *
+ * When a backlight device is registered the driver has the possibility
+ * to supply a void * devdata. bl_get_data() return a pointer to the
+ * devdata.
+ *
+ * RETURNS:
+ *
+ * pointer to devdata stored while registering the backlight device.
+ */
 static inline void * bl_get_data(struct backlight_device *bl_dev)
 {
 	return dev_get_drvdata(&bl_dev->dev);
-- 
2.25.1

[PATCH v3 06/13] backlight: document inline functions in backlight.h

[Sam Ravnborg]

Add documentation for the inline functions in backlight.h

v2:
 - Fix spelling (Daniel)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index cae1af95dd9d..f99ca19cc3ec 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -268,6 +268,10 @@ struct backlight_device {
 	int use_count;
 };
 
+/**
+ * backlight_update_status - force an update of the backlight device status
+ * @bd: the backlight device
+ */
 static inline int backlight_update_status(struct backlight_device *bd)
 {
 	int ret = -ENOENT;
@@ -360,6 +364,18 @@ extern int backlight_device_set_brightness(struct backlight_device *bd, unsigned
 
 #define to_backlight_device(obj) container_of(obj, struct backlight_device, dev)
 
+/**
+ * bl_get_data - access devdata
+ * @bl_dev: pointer to backlight device
+ *
+ * When a backlight device is registered the driver has the possibility
+ * to supply a void * devdata. bl_get_data() return a pointer to the
+ * devdata.
+ *
+ * RETURNS:
+ *
+ * pointer to devdata stored while registering the backlight device.
+ */
 static inline void * bl_get_data(struct backlight_device *bl_dev)
 {
 	return dev_get_drvdata(&bl_dev->dev);
-- 
2.25.1

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[PATCH v3 07/13] backlight: document enums in backlight.h

[Sam Ravnborg]

Add kernel-doc documentation for the backlight enums

v2:
  - Add intro to each enum member (Daniel)
    Except backlight type as line lenght was too long.
    The generated HTML is the same.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 74 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 73 insertions(+), 1 deletion(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index f99ca19cc3ec..c1c7b1666a9b 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -14,26 +14,98 @@
 #include <linux/mutex.h>
 #include <linux/notifier.h>
 
+/**
+ * enum backlight_update_reason - what method was used to update backlight
+ *
+ * A driver indicates the method (reason) used for updating the backlight
+ * when calling backlight_force_update().
+ */
 enum backlight_update_reason {
+	/**
+	 * @BACKLIGHT_UPDATE_HOTKEY: The backlight was updated using a hot-key.
+	 */
 	BACKLIGHT_UPDATE_HOTKEY,
+
+	/**
+	 * @BACKLIGHT_UPDATE_SYSFS: The backlight was updated using sysfs.
+	 */
 	BACKLIGHT_UPDATE_SYSFS,
 };
 
+/**
+ * enum backlight_type - the type of backlight control
+ *
+ * The type of interface used to control the backlight.
+ */
 enum backlight_type {
+	/**
+	 * @BACKLIGHT_RAW:
+	 *
+	 * The backlight is controlled using hardware registers.
+	 */
 	BACKLIGHT_RAW = 1,
+
+	/**
+	 * @BACKLIGHT_PLATFORM:
+	 *
+	 * The backlight is controlled using a platform-specific interface.
+	 */
 	BACKLIGHT_PLATFORM,
+
+	/**
+	 * @BACKLIGHT_FIRMWARE:
+	 *
+	 * The backlight is controlled using a standard firmware interface.
+	 */
 	BACKLIGHT_FIRMWARE,
+
+	/**
+	 * @BACKLIGHT_TYPE_MAX: Number of entries.
+	 */
 	BACKLIGHT_TYPE_MAX,
 };
 
+/**
+ * enum backlight_notification - the type of notification
+ *
+ * The notifications that is used for notification sent to the receiver
+ * that registered notifications using backlight_register_notifier().
+ */
 enum backlight_notification {
+	/**
+	 * @BACKLIGHT_REGISTERED: The backlight device is registered.
+	 */
 	BACKLIGHT_REGISTERED,
+
+	/**
+	 * @BACKLIGHT_UNREGISTERED: The backlight revice is unregistered.
+	 */
 	BACKLIGHT_UNREGISTERED,
 };
 
+/** enum backlight_scale - the type of scale used for brightness values
+ *
+ * The type of scale used for brightness values.
+ */
 enum backlight_scale {
+	/**
+	 * @BACKLIGHT_SCALE_UNKNOWN: The scale is unknown.
+	 */
 	BACKLIGHT_SCALE_UNKNOWN = 0,
+
+	/**
+	 * @BACKLIGHT_SCALE_LINEAR: The scale is linear.
+	 *
+	 * The linear scale will increase brightness the same for each step.
+	 */
 	BACKLIGHT_SCALE_LINEAR,
+
+	/**
+	 * @BACKLIGHT_SCALE_NON_LINEAR: The scale is not linear.
+	 *
+	 * This is often used when the brightness values tries to adjust to
+	 * the relative perception of the eye demanding a non-linear scale.
+	 */
 	BACKLIGHT_SCALE_NON_LINEAR,
 };
 
@@ -149,7 +221,7 @@ struct backlight_properties {
 	/**
 	 * @fb_blank: The power state from the FBIOBLANK ioclt.
 	 *
-	 * When the FBIOBLANK ioctl is called fb_blank is set to the
+	 * When the FBIOBLANK ioctl is called @fb_blank is set to the
 	 * blank parameter and the update_status() operation is called.
 	 *
 	 * When the backlight device is enabled @fb_blank is set
-- 
2.25.1

[PATCH v3 07/13] backlight: document enums in backlight.h

[Sam Ravnborg]

Add kernel-doc documentation for the backlight enums

v2:
  - Add intro to each enum member (Daniel)
    Except backlight type as line lenght was too long.
    The generated HTML is the same.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 74 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 73 insertions(+), 1 deletion(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index f99ca19cc3ec..c1c7b1666a9b 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -14,26 +14,98 @@
 #include <linux/mutex.h>
 #include <linux/notifier.h>
 
+/**
+ * enum backlight_update_reason - what method was used to update backlight
+ *
+ * A driver indicates the method (reason) used for updating the backlight
+ * when calling backlight_force_update().
+ */
 enum backlight_update_reason {
+	/**
+	 * @BACKLIGHT_UPDATE_HOTKEY: The backlight was updated using a hot-key.
+	 */
 	BACKLIGHT_UPDATE_HOTKEY,
+
+	/**
+	 * @BACKLIGHT_UPDATE_SYSFS: The backlight was updated using sysfs.
+	 */
 	BACKLIGHT_UPDATE_SYSFS,
 };
 
+/**
+ * enum backlight_type - the type of backlight control
+ *
+ * The type of interface used to control the backlight.
+ */
 enum backlight_type {
+	/**
+	 * @BACKLIGHT_RAW:
+	 *
+	 * The backlight is controlled using hardware registers.
+	 */
 	BACKLIGHT_RAW = 1,
+
+	/**
+	 * @BACKLIGHT_PLATFORM:
+	 *
+	 * The backlight is controlled using a platform-specific interface.
+	 */
 	BACKLIGHT_PLATFORM,
+
+	/**
+	 * @BACKLIGHT_FIRMWARE:
+	 *
+	 * The backlight is controlled using a standard firmware interface.
+	 */
 	BACKLIGHT_FIRMWARE,
+
+	/**
+	 * @BACKLIGHT_TYPE_MAX: Number of entries.
+	 */
 	BACKLIGHT_TYPE_MAX,
 };
 
+/**
+ * enum backlight_notification - the type of notification
+ *
+ * The notifications that is used for notification sent to the receiver
+ * that registered notifications using backlight_register_notifier().
+ */
 enum backlight_notification {
+	/**
+	 * @BACKLIGHT_REGISTERED: The backlight device is registered.
+	 */
 	BACKLIGHT_REGISTERED,
+
+	/**
+	 * @BACKLIGHT_UNREGISTERED: The backlight revice is unregistered.
+	 */
 	BACKLIGHT_UNREGISTERED,
 };
 
+/** enum backlight_scale - the type of scale used for brightness values
+ *
+ * The type of scale used for brightness values.
+ */
 enum backlight_scale {
+	/**
+	 * @BACKLIGHT_SCALE_UNKNOWN: The scale is unknown.
+	 */
 	BACKLIGHT_SCALE_UNKNOWN = 0,
+
+	/**
+	 * @BACKLIGHT_SCALE_LINEAR: The scale is linear.
+	 *
+	 * The linear scale will increase brightness the same for each step.
+	 */
 	BACKLIGHT_SCALE_LINEAR,
+
+	/**
+	 * @BACKLIGHT_SCALE_NON_LINEAR: The scale is not linear.
+	 *
+	 * This is often used when the brightness values tries to adjust to
+	 * the relative perception of the eye demanding a non-linear scale.
+	 */
 	BACKLIGHT_SCALE_NON_LINEAR,
 };
 
@@ -149,7 +221,7 @@ struct backlight_properties {
 	/**
 	 * @fb_blank: The power state from the FBIOBLANK ioclt.
 	 *
-	 * When the FBIOBLANK ioctl is called fb_blank is set to the
+	 * When the FBIOBLANK ioctl is called @fb_blank is set to the
 	 * blank parameter and the update_status() operation is called.
 	 *
 	 * When the backlight device is enabled @fb_blank is set
-- 
2.25.1

[PATCH v3 07/13] backlight: document enums in backlight.h

[Sam Ravnborg]

Add kernel-doc documentation for the backlight enums

v2:
  - Add intro to each enum member (Daniel)
    Except backlight type as line lenght was too long.
    The generated HTML is the same.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 74 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 73 insertions(+), 1 deletion(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index f99ca19cc3ec..c1c7b1666a9b 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -14,26 +14,98 @@
 #include <linux/mutex.h>
 #include <linux/notifier.h>
 
+/**
+ * enum backlight_update_reason - what method was used to update backlight
+ *
+ * A driver indicates the method (reason) used for updating the backlight
+ * when calling backlight_force_update().
+ */
 enum backlight_update_reason {
+	/**
+	 * @BACKLIGHT_UPDATE_HOTKEY: The backlight was updated using a hot-key.
+	 */
 	BACKLIGHT_UPDATE_HOTKEY,
+
+	/**
+	 * @BACKLIGHT_UPDATE_SYSFS: The backlight was updated using sysfs.
+	 */
 	BACKLIGHT_UPDATE_SYSFS,
 };
 
+/**
+ * enum backlight_type - the type of backlight control
+ *
+ * The type of interface used to control the backlight.
+ */
 enum backlight_type {
+	/**
+	 * @BACKLIGHT_RAW:
+	 *
+	 * The backlight is controlled using hardware registers.
+	 */
 	BACKLIGHT_RAW = 1,
+
+	/**
+	 * @BACKLIGHT_PLATFORM:
+	 *
+	 * The backlight is controlled using a platform-specific interface.
+	 */
 	BACKLIGHT_PLATFORM,
+
+	/**
+	 * @BACKLIGHT_FIRMWARE:
+	 *
+	 * The backlight is controlled using a standard firmware interface.
+	 */
 	BACKLIGHT_FIRMWARE,
+
+	/**
+	 * @BACKLIGHT_TYPE_MAX: Number of entries.
+	 */
 	BACKLIGHT_TYPE_MAX,
 };
 
+/**
+ * enum backlight_notification - the type of notification
+ *
+ * The notifications that is used for notification sent to the receiver
+ * that registered notifications using backlight_register_notifier().
+ */
 enum backlight_notification {
+	/**
+	 * @BACKLIGHT_REGISTERED: The backlight device is registered.
+	 */
 	BACKLIGHT_REGISTERED,
+
+	/**
+	 * @BACKLIGHT_UNREGISTERED: The backlight revice is unregistered.
+	 */
 	BACKLIGHT_UNREGISTERED,
 };
 
+/** enum backlight_scale - the type of scale used for brightness values
+ *
+ * The type of scale used for brightness values.
+ */
 enum backlight_scale {
+	/**
+	 * @BACKLIGHT_SCALE_UNKNOWN: The scale is unknown.
+	 */
 	BACKLIGHT_SCALE_UNKNOWN = 0,
+
+	/**
+	 * @BACKLIGHT_SCALE_LINEAR: The scale is linear.
+	 *
+	 * The linear scale will increase brightness the same for each step.
+	 */
 	BACKLIGHT_SCALE_LINEAR,
+
+	/**
+	 * @BACKLIGHT_SCALE_NON_LINEAR: The scale is not linear.
+	 *
+	 * This is often used when the brightness values tries to adjust to
+	 * the relative perception of the eye demanding a non-linear scale.
+	 */
 	BACKLIGHT_SCALE_NON_LINEAR,
 };
 
@@ -149,7 +221,7 @@ struct backlight_properties {
 	/**
 	 * @fb_blank: The power state from the FBIOBLANK ioclt.
 	 *
-	 * When the FBIOBLANK ioctl is called fb_blank is set to the
+	 * When the FBIOBLANK ioctl is called @fb_blank is set to the
 	 * blank parameter and the update_status() operation is called.
 	 *
 	 * When the backlight device is enabled @fb_blank is set
-- 
2.25.1

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v3 08/13] backlight: remove the unused backlight_bl driver

[Sam Ravnborg]

The backlight_bl driver required initialization using
struct generic_bl_info. As there are no more references
to this struct there is no users left.
So it is safe to delete the driver.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 drivers/video/backlight/Kconfig      |   8 --
 drivers/video/backlight/Makefile     |   1 -
 drivers/video/backlight/generic_bl.c | 110 ---------------------------
 include/linux/backlight.h            |   9 ---
 4 files changed, 128 deletions(-)
 delete mode 100644 drivers/video/backlight/generic_bl.c

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 7d22d7377606..14abfeee8868 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -173,14 +173,6 @@ config BACKLIGHT_EP93XX
 	  To compile this driver as a module, choose M here: the module will
 	  be called ep93xx_bl.
 
-config BACKLIGHT_GENERIC
-	tristate "Generic (aka Sharp Corgi) Backlight Driver"
-	default y
-	help
-	  Say y to enable the generic platform backlight driver previously
-	  known as the Corgi backlight driver. If you have a Sharp Zaurus
-	  SL-C7xx, SL-Cxx00 or SL-6000x say y.
-
 config BACKLIGHT_IPAQ_MICRO
 	tristate "iPAQ microcontroller backlight driver"
 	depends on MFD_IPAQ_MICRO
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 0c1a1524627a..9b998cfdc56d 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -31,7 +31,6 @@ obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE)	+= backlight.o
 obj-$(CONFIG_BACKLIGHT_DA903X)		+= da903x_bl.o
 obj-$(CONFIG_BACKLIGHT_DA9052)		+= da9052_bl.o
 obj-$(CONFIG_BACKLIGHT_EP93XX)		+= ep93xx_bl.o
-obj-$(CONFIG_BACKLIGHT_GENERIC)		+= generic_bl.o
 obj-$(CONFIG_BACKLIGHT_GPIO)		+= gpio_backlight.o
 obj-$(CONFIG_BACKLIGHT_HP680)		+= hp680_bl.o
 obj-$(CONFIG_BACKLIGHT_HP700)		+= jornada720_bl.o
diff --git a/drivers/video/backlight/generic_bl.c b/drivers/video/backlight/generic_bl.c
deleted file mode 100644
index 8fe63dbc8590..000000000000
--- a/drivers/video/backlight/generic_bl.c
+++ /dev/null
@@ -1,110 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- *  Generic Backlight Driver
- *
- *  Copyright (c) 2004-2008 Richard Purdie
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/mutex.h>
-#include <linux/fb.h>
-#include <linux/backlight.h>
-
-static int genericbl_intensity;
-static struct backlight_device *generic_backlight_device;
-static struct generic_bl_info *bl_machinfo;
-
-static int genericbl_send_intensity(struct backlight_device *bd)
-{
-	int intensity = bd->props.brightness;
-
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		intensity = 0;
-	if (bd->props.state & BL_CORE_FBBLANK)
-		intensity = 0;
-	if (bd->props.state & BL_CORE_SUSPENDED)
-		intensity = 0;
-
-	bl_machinfo->set_bl_intensity(intensity);
-
-	genericbl_intensity = intensity;
-
-	if (bl_machinfo->kick_battery)
-		bl_machinfo->kick_battery();
-
-	return 0;
-}
-
-static int genericbl_get_intensity(struct backlight_device *bd)
-{
-	return genericbl_intensity;
-}
-
-static const struct backlight_ops genericbl_ops = {
-	.options = BL_CORE_SUSPENDRESUME,
-	.get_brightness = genericbl_get_intensity,
-	.update_status  = genericbl_send_intensity,
-};
-
-static int genericbl_probe(struct platform_device *pdev)
-{
-	struct backlight_properties props;
-	struct generic_bl_info *machinfo = dev_get_platdata(&pdev->dev);
-	const char *name = "generic-bl";
-	struct backlight_device *bd;
-
-	bl_machinfo = machinfo;
-	if (!machinfo->limit_mask)
-		machinfo->limit_mask = -1;
-
-	if (machinfo->name)
-		name = machinfo->name;
-
-	memset(&props, 0, sizeof(struct backlight_properties));
-	props.type = BACKLIGHT_RAW;
-	props.max_brightness = machinfo->max_intensity;
-	bd = devm_backlight_device_register(&pdev->dev, name, &pdev->dev,
-					NULL, &genericbl_ops, &props);
-	if (IS_ERR(bd))
-		return PTR_ERR(bd);
-
-	platform_set_drvdata(pdev, bd);
-
-	bd->props.power = FB_BLANK_UNBLANK;
-	bd->props.brightness = machinfo->default_intensity;
-	backlight_update_status(bd);
-
-	generic_backlight_device = bd;
-
-	dev_info(&pdev->dev, "Generic Backlight Driver Initialized.\n");
-	return 0;
-}
-
-static int genericbl_remove(struct platform_device *pdev)
-{
-	struct backlight_device *bd = platform_get_drvdata(pdev);
-
-	bd->props.power = 0;
-	bd->props.brightness = 0;
-	backlight_update_status(bd);
-
-	dev_info(&pdev->dev, "Generic Backlight Driver Unloaded\n");
-	return 0;
-}
-
-static struct platform_driver genericbl_driver = {
-	.probe		= genericbl_probe,
-	.remove		= genericbl_remove,
-	.driver		= {
-		.name	= "generic-bl",
-	},
-};
-
-module_platform_driver(genericbl_driver);
-
-MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
-MODULE_DESCRIPTION("Generic Backlight Driver");
-MODULE_LICENSE("GPL");
diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index c1c7b1666a9b..6bd981a600ef 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -453,15 +453,6 @@ static inline void * bl_get_data(struct backlight_device *bl_dev)
 	return dev_get_drvdata(&bl_dev->dev);
 }
 
-struct generic_bl_info {
-	const char *name;
-	int max_intensity;
-	int default_intensity;
-	int limit_mask;
-	void (*set_bl_intensity)(int intensity);
-	void (*kick_battery)(void);
-};
-
 #ifdef CONFIG_OF
 struct backlight_device *of_find_backlight_by_node(struct device_node *node);
 #else
-- 
2.25.1

[PATCH v3 08/13] backlight: remove the unused backlight_bl driver

[Sam Ravnborg]

The backlight_bl driver required initialization using
struct generic_bl_info. As there are no more references
to this struct there is no users left.
So it is safe to delete the driver.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 drivers/video/backlight/Kconfig      |   8 --
 drivers/video/backlight/Makefile     |   1 -
 drivers/video/backlight/generic_bl.c | 110 ---------------------------
 include/linux/backlight.h            |   9 ---
 4 files changed, 128 deletions(-)
 delete mode 100644 drivers/video/backlight/generic_bl.c

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 7d22d7377606..14abfeee8868 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -173,14 +173,6 @@ config BACKLIGHT_EP93XX
 	  To compile this driver as a module, choose M here: the module will
 	  be called ep93xx_bl.
 
-config BACKLIGHT_GENERIC
-	tristate "Generic (aka Sharp Corgi) Backlight Driver"
-	default y
-	help
-	  Say y to enable the generic platform backlight driver previously
-	  known as the Corgi backlight driver. If you have a Sharp Zaurus
-	  SL-C7xx, SL-Cxx00 or SL-6000x say y.
-
 config BACKLIGHT_IPAQ_MICRO
 	tristate "iPAQ microcontroller backlight driver"
 	depends on MFD_IPAQ_MICRO
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 0c1a1524627a..9b998cfdc56d 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -31,7 +31,6 @@ obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE)	+= backlight.o
 obj-$(CONFIG_BACKLIGHT_DA903X)		+= da903x_bl.o
 obj-$(CONFIG_BACKLIGHT_DA9052)		+= da9052_bl.o
 obj-$(CONFIG_BACKLIGHT_EP93XX)		+= ep93xx_bl.o
-obj-$(CONFIG_BACKLIGHT_GENERIC)		+= generic_bl.o
 obj-$(CONFIG_BACKLIGHT_GPIO)		+= gpio_backlight.o
 obj-$(CONFIG_BACKLIGHT_HP680)		+= hp680_bl.o
 obj-$(CONFIG_BACKLIGHT_HP700)		+= jornada720_bl.o
diff --git a/drivers/video/backlight/generic_bl.c b/drivers/video/backlight/generic_bl.c
deleted file mode 100644
index 8fe63dbc8590..000000000000
--- a/drivers/video/backlight/generic_bl.c
+++ /dev/null
@@ -1,110 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- *  Generic Backlight Driver
- *
- *  Copyright (c) 2004-2008 Richard Purdie
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/mutex.h>
-#include <linux/fb.h>
-#include <linux/backlight.h>
-
-static int genericbl_intensity;
-static struct backlight_device *generic_backlight_device;
-static struct generic_bl_info *bl_machinfo;
-
-static int genericbl_send_intensity(struct backlight_device *bd)
-{
-	int intensity = bd->props.brightness;
-
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		intensity = 0;
-	if (bd->props.state & BL_CORE_FBBLANK)
-		intensity = 0;
-	if (bd->props.state & BL_CORE_SUSPENDED)
-		intensity = 0;
-
-	bl_machinfo->set_bl_intensity(intensity);
-
-	genericbl_intensity = intensity;
-
-	if (bl_machinfo->kick_battery)
-		bl_machinfo->kick_battery();
-
-	return 0;
-}
-
-static int genericbl_get_intensity(struct backlight_device *bd)
-{
-	return genericbl_intensity;
-}
-
-static const struct backlight_ops genericbl_ops = {
-	.options = BL_CORE_SUSPENDRESUME,
-	.get_brightness = genericbl_get_intensity,
-	.update_status  = genericbl_send_intensity,
-};
-
-static int genericbl_probe(struct platform_device *pdev)
-{
-	struct backlight_properties props;
-	struct generic_bl_info *machinfo = dev_get_platdata(&pdev->dev);
-	const char *name = "generic-bl";
-	struct backlight_device *bd;
-
-	bl_machinfo = machinfo;
-	if (!machinfo->limit_mask)
-		machinfo->limit_mask = -1;
-
-	if (machinfo->name)
-		name = machinfo->name;
-
-	memset(&props, 0, sizeof(struct backlight_properties));
-	props.type = BACKLIGHT_RAW;
-	props.max_brightness = machinfo->max_intensity;
-	bd = devm_backlight_device_register(&pdev->dev, name, &pdev->dev,
-					NULL, &genericbl_ops, &props);
-	if (IS_ERR(bd))
-		return PTR_ERR(bd);
-
-	platform_set_drvdata(pdev, bd);
-
-	bd->props.power = FB_BLANK_UNBLANK;
-	bd->props.brightness = machinfo->default_intensity;
-	backlight_update_status(bd);
-
-	generic_backlight_device = bd;
-
-	dev_info(&pdev->dev, "Generic Backlight Driver Initialized.\n");
-	return 0;
-}
-
-static int genericbl_remove(struct platform_device *pdev)
-{
-	struct backlight_device *bd = platform_get_drvdata(pdev);
-
-	bd->props.power = 0;
-	bd->props.brightness = 0;
-	backlight_update_status(bd);
-
-	dev_info(&pdev->dev, "Generic Backlight Driver Unloaded\n");
-	return 0;
-}
-
-static struct platform_driver genericbl_driver = {
-	.probe		= genericbl_probe,
-	.remove		= genericbl_remove,
-	.driver		= {
-		.name	= "generic-bl",
-	},
-};
-
-module_platform_driver(genericbl_driver);
-
-MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
-MODULE_DESCRIPTION("Generic Backlight Driver");
-MODULE_LICENSE("GPL");
diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index c1c7b1666a9b..6bd981a600ef 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -453,15 +453,6 @@ static inline void * bl_get_data(struct backlight_device *bl_dev)
 	return dev_get_drvdata(&bl_dev->dev);
 }
 
-struct generic_bl_info {
-	const char *name;
-	int max_intensity;
-	int default_intensity;
-	int limit_mask;
-	void (*set_bl_intensity)(int intensity);
-	void (*kick_battery)(void);
-};
-
 #ifdef CONFIG_OF
 struct backlight_device *of_find_backlight_by_node(struct device_node *node);
 #else
-- 
2.25.1

[PATCH v3 08/13] backlight: remove the unused backlight_bl driver

[Sam Ravnborg]

The backlight_bl driver required initialization using
struct generic_bl_info. As there are no more references
to this struct there is no users left.
So it is safe to delete the driver.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 drivers/video/backlight/Kconfig      |   8 --
 drivers/video/backlight/Makefile     |   1 -
 drivers/video/backlight/generic_bl.c | 110 ---------------------------
 include/linux/backlight.h            |   9 ---
 4 files changed, 128 deletions(-)
 delete mode 100644 drivers/video/backlight/generic_bl.c

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 7d22d7377606..14abfeee8868 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -173,14 +173,6 @@ config BACKLIGHT_EP93XX
 	  To compile this driver as a module, choose M here: the module will
 	  be called ep93xx_bl.
 
-config BACKLIGHT_GENERIC
-	tristate "Generic (aka Sharp Corgi) Backlight Driver"
-	default y
-	help
-	  Say y to enable the generic platform backlight driver previously
-	  known as the Corgi backlight driver. If you have a Sharp Zaurus
-	  SL-C7xx, SL-Cxx00 or SL-6000x say y.
-
 config BACKLIGHT_IPAQ_MICRO
 	tristate "iPAQ microcontroller backlight driver"
 	depends on MFD_IPAQ_MICRO
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 0c1a1524627a..9b998cfdc56d 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -31,7 +31,6 @@ obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE)	+= backlight.o
 obj-$(CONFIG_BACKLIGHT_DA903X)		+= da903x_bl.o
 obj-$(CONFIG_BACKLIGHT_DA9052)		+= da9052_bl.o
 obj-$(CONFIG_BACKLIGHT_EP93XX)		+= ep93xx_bl.o
-obj-$(CONFIG_BACKLIGHT_GENERIC)		+= generic_bl.o
 obj-$(CONFIG_BACKLIGHT_GPIO)		+= gpio_backlight.o
 obj-$(CONFIG_BACKLIGHT_HP680)		+= hp680_bl.o
 obj-$(CONFIG_BACKLIGHT_HP700)		+= jornada720_bl.o
diff --git a/drivers/video/backlight/generic_bl.c b/drivers/video/backlight/generic_bl.c
deleted file mode 100644
index 8fe63dbc8590..000000000000
--- a/drivers/video/backlight/generic_bl.c
+++ /dev/null
@@ -1,110 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- *  Generic Backlight Driver
- *
- *  Copyright (c) 2004-2008 Richard Purdie
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/mutex.h>
-#include <linux/fb.h>
-#include <linux/backlight.h>
-
-static int genericbl_intensity;
-static struct backlight_device *generic_backlight_device;
-static struct generic_bl_info *bl_machinfo;
-
-static int genericbl_send_intensity(struct backlight_device *bd)
-{
-	int intensity = bd->props.brightness;
-
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		intensity = 0;
-	if (bd->props.state & BL_CORE_FBBLANK)
-		intensity = 0;
-	if (bd->props.state & BL_CORE_SUSPENDED)
-		intensity = 0;
-
-	bl_machinfo->set_bl_intensity(intensity);
-
-	genericbl_intensity = intensity;
-
-	if (bl_machinfo->kick_battery)
-		bl_machinfo->kick_battery();
-
-	return 0;
-}
-
-static int genericbl_get_intensity(struct backlight_device *bd)
-{
-	return genericbl_intensity;
-}
-
-static const struct backlight_ops genericbl_ops = {
-	.options = BL_CORE_SUSPENDRESUME,
-	.get_brightness = genericbl_get_intensity,
-	.update_status  = genericbl_send_intensity,
-};
-
-static int genericbl_probe(struct platform_device *pdev)
-{
-	struct backlight_properties props;
-	struct generic_bl_info *machinfo = dev_get_platdata(&pdev->dev);
-	const char *name = "generic-bl";
-	struct backlight_device *bd;
-
-	bl_machinfo = machinfo;
-	if (!machinfo->limit_mask)
-		machinfo->limit_mask = -1;
-
-	if (machinfo->name)
-		name = machinfo->name;
-
-	memset(&props, 0, sizeof(struct backlight_properties));
-	props.type = BACKLIGHT_RAW;
-	props.max_brightness = machinfo->max_intensity;
-	bd = devm_backlight_device_register(&pdev->dev, name, &pdev->dev,
-					NULL, &genericbl_ops, &props);
-	if (IS_ERR(bd))
-		return PTR_ERR(bd);
-
-	platform_set_drvdata(pdev, bd);
-
-	bd->props.power = FB_BLANK_UNBLANK;
-	bd->props.brightness = machinfo->default_intensity;
-	backlight_update_status(bd);
-
-	generic_backlight_device = bd;
-
-	dev_info(&pdev->dev, "Generic Backlight Driver Initialized.\n");
-	return 0;
-}
-
-static int genericbl_remove(struct platform_device *pdev)
-{
-	struct backlight_device *bd = platform_get_drvdata(pdev);
-
-	bd->props.power = 0;
-	bd->props.brightness = 0;
-	backlight_update_status(bd);
-
-	dev_info(&pdev->dev, "Generic Backlight Driver Unloaded\n");
-	return 0;
-}
-
-static struct platform_driver genericbl_driver = {
-	.probe		= genericbl_probe,
-	.remove		= genericbl_remove,
-	.driver		= {
-		.name	= "generic-bl",
-	},
-};
-
-module_platform_driver(genericbl_driver);
-
-MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
-MODULE_DESCRIPTION("Generic Backlight Driver");
-MODULE_LICENSE("GPL");
diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index c1c7b1666a9b..6bd981a600ef 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -453,15 +453,6 @@ static inline void * bl_get_data(struct backlight_device *bl_dev)
 	return dev_get_drvdata(&bl_dev->dev);
 }
 
-struct generic_bl_info {
-	const char *name;
-	int max_intensity;
-	int default_intensity;
-	int limit_mask;
-	void (*set_bl_intensity)(int intensity);
-	void (*kick_battery)(void);
-};
-
 #ifdef CONFIG_OF
 struct backlight_device *of_find_backlight_by_node(struct device_node *node);
 #else
-- 
2.25.1

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https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v3 09/13] backlight: drop extern from prototypes

[Sam Ravnborg]

No need to put "extern" in front of prototypes.
While touching the prototypes adjust indent to follow
the kernel style.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 35 +++++++++++++++++++----------------
 1 file changed, 19 insertions(+), 16 deletions(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 6bd981a600ef..25a3aac89618 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -417,22 +417,25 @@ static inline bool backlight_is_blank(struct backlight_device *bd)
 	       bd->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK);
 }
 
-extern struct backlight_device *backlight_device_register(const char *name,
-	struct device *dev, void *devdata, const struct backlight_ops *ops,
-	const struct backlight_properties *props);
-extern struct backlight_device *devm_backlight_device_register(
-	struct device *dev, const char *name, struct device *parent,
-	void *devdata, const struct backlight_ops *ops,
-	const struct backlight_properties *props);
-extern void backlight_device_unregister(struct backlight_device *bd);
-extern void devm_backlight_device_unregister(struct device *dev,
-					struct backlight_device *bd);
-extern void backlight_force_update(struct backlight_device *bd,
-				   enum backlight_update_reason reason);
-extern int backlight_register_notifier(struct notifier_block *nb);
-extern int backlight_unregister_notifier(struct notifier_block *nb);
-extern struct backlight_device *backlight_device_get_by_type(enum backlight_type type);
-extern int backlight_device_set_brightness(struct backlight_device *bd, unsigned long brightness);
+struct backlight_device *
+backlight_device_register(const char *name, struct device *dev, void *devdata,
+			  const struct backlight_ops *ops,
+			  const struct backlight_properties *props);
+struct backlight_device *
+devm_backlight_device_register(struct device *dev, const char *name,
+			       struct device *parent, void *devdata,
+			       const struct backlight_ops *ops,
+			       const struct backlight_properties *props);
+void backlight_device_unregister(struct backlight_device *bd);
+void devm_backlight_device_unregister(struct device *dev,
+				      struct backlight_device *bd);
+void backlight_force_update(struct backlight_device *bd,
+			    enum backlight_update_reason reason);
+int backlight_register_notifier(struct notifier_block *nb);
+int backlight_unregister_notifier(struct notifier_block *nb);
+struct backlight_device *backlight_device_get_by_type(enum backlight_type type);
+int backlight_device_set_brightness(struct backlight_device *bd,
+				    unsigned long brightness);
 
 #define to_backlight_device(obj) container_of(obj, struct backlight_device, dev)
 
-- 
2.25.1

[PATCH v3 09/13] backlight: drop extern from prototypes

[Sam Ravnborg]

No need to put "extern" in front of prototypes.
While touching the prototypes adjust indent to follow
the kernel style.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 35 +++++++++++++++++++----------------
 1 file changed, 19 insertions(+), 16 deletions(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 6bd981a600ef..25a3aac89618 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -417,22 +417,25 @@ static inline bool backlight_is_blank(struct backlight_device *bd)
 	       bd->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK);
 }
 
-extern struct backlight_device *backlight_device_register(const char *name,
-	struct device *dev, void *devdata, const struct backlight_ops *ops,
-	const struct backlight_properties *props);
-extern struct backlight_device *devm_backlight_device_register(
-	struct device *dev, const char *name, struct device *parent,
-	void *devdata, const struct backlight_ops *ops,
-	const struct backlight_properties *props);
-extern void backlight_device_unregister(struct backlight_device *bd);
-extern void devm_backlight_device_unregister(struct device *dev,
-					struct backlight_device *bd);
-extern void backlight_force_update(struct backlight_device *bd,
-				   enum backlight_update_reason reason);
-extern int backlight_register_notifier(struct notifier_block *nb);
-extern int backlight_unregister_notifier(struct notifier_block *nb);
-extern struct backlight_device *backlight_device_get_by_type(enum backlight_type type);
-extern int backlight_device_set_brightness(struct backlight_device *bd, unsigned long brightness);
+struct backlight_device *
+backlight_device_register(const char *name, struct device *dev, void *devdata,
+			  const struct backlight_ops *ops,
+			  const struct backlight_properties *props);
+struct backlight_device *
+devm_backlight_device_register(struct device *dev, const char *name,
+			       struct device *parent, void *devdata,
+			       const struct backlight_ops *ops,
+			       const struct backlight_properties *props);
+void backlight_device_unregister(struct backlight_device *bd);
+void devm_backlight_device_unregister(struct device *dev,
+				      struct backlight_device *bd);
+void backlight_force_update(struct backlight_device *bd,
+			    enum backlight_update_reason reason);
+int backlight_register_notifier(struct notifier_block *nb);
+int backlight_unregister_notifier(struct notifier_block *nb);
+struct backlight_device *backlight_device_get_by_type(enum backlight_type type);
+int backlight_device_set_brightness(struct backlight_device *bd,
+				    unsigned long brightness);
 
 #define to_backlight_device(obj) container_of(obj, struct backlight_device, dev)
 
-- 
2.25.1

[PATCH v3 09/13] backlight: drop extern from prototypes

[Sam Ravnborg]

No need to put "extern" in front of prototypes.
While touching the prototypes adjust indent to follow
the kernel style.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 include/linux/backlight.h | 35 +++++++++++++++++++----------------
 1 file changed, 19 insertions(+), 16 deletions(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 6bd981a600ef..25a3aac89618 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -417,22 +417,25 @@ static inline bool backlight_is_blank(struct backlight_device *bd)
 	       bd->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK);
 }
 
-extern struct backlight_device *backlight_device_register(const char *name,
-	struct device *dev, void *devdata, const struct backlight_ops *ops,
-	const struct backlight_properties *props);
-extern struct backlight_device *devm_backlight_device_register(
-	struct device *dev, const char *name, struct device *parent,
-	void *devdata, const struct backlight_ops *ops,
-	const struct backlight_properties *props);
-extern void backlight_device_unregister(struct backlight_device *bd);
-extern void devm_backlight_device_unregister(struct device *dev,
-					struct backlight_device *bd);
-extern void backlight_force_update(struct backlight_device *bd,
-				   enum backlight_update_reason reason);
-extern int backlight_register_notifier(struct notifier_block *nb);
-extern int backlight_unregister_notifier(struct notifier_block *nb);
-extern struct backlight_device *backlight_device_get_by_type(enum backlight_type type);
-extern int backlight_device_set_brightness(struct backlight_device *bd, unsigned long brightness);
+struct backlight_device *
+backlight_device_register(const char *name, struct device *dev, void *devdata,
+			  const struct backlight_ops *ops,
+			  const struct backlight_properties *props);
+struct backlight_device *
+devm_backlight_device_register(struct device *dev, const char *name,
+			       struct device *parent, void *devdata,
+			       const struct backlight_ops *ops,
+			       const struct backlight_properties *props);
+void backlight_device_unregister(struct backlight_device *bd);
+void devm_backlight_device_unregister(struct device *dev,
+				      struct backlight_device *bd);
+void backlight_force_update(struct backlight_device *bd,
+			    enum backlight_update_reason reason);
+int backlight_register_notifier(struct notifier_block *nb);
+int backlight_unregister_notifier(struct notifier_block *nb);
+struct backlight_device *backlight_device_get_by_type(enum backlight_type type);
+int backlight_device_set_brightness(struct backlight_device *bd,
+				    unsigned long brightness);
 
 #define to_backlight_device(obj) container_of(obj, struct backlight_device, dev)
 
-- 
2.25.1

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[PATCH v3 10/13] backlight: add overview and update existing doc

[Sam Ravnborg]

Add overview chapter to backlight.c.
Update existing kernel-doc to follow a more consistent
style and drop kernel-doc for deprecated functions.

v2:
  - Sevaral editorial corrections that makes reading
    much easier (Daniel)
  - Spelling fixes (Daniel)
  - updated intro chapter with a little more info

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 drivers/video/backlight/backlight.c | 131 +++++++++++++++++++---------
 1 file changed, 90 insertions(+), 41 deletions(-)

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 17f04cff50ab..06bcddd76a7e 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -22,6 +22,46 @@
 #include <asm/backlight.h>
 #endif
 
+/**
+ * DOC: overview
+ *
+ * The backlight core supports implementing backlight drivers.
+ *
+ * A backlight driver registers a driver using
+ * devm_backlight_device_register(). The properties of the backlight
+ * driver such as type and max_brightness must be specified.
+ * When the core detect changes in for example brightness or power state
+ * the update_status() operation is called. The backlight driver shall
+ * implement this operation and use it to adjust backlight.
+ *
+ * Several sysfs attributes are provided by the backlight core::
+ *
+ * - brightness         R/W, set the requested brightness level
+ * - actual_brighness   RO, the brightness level used by the HW
+ * - max_brightness     RO, the maximum  brightness level supported
+ *
+ * See Documentation/ABI/stable/sysfs-class-backlight for the full list.
+ *
+ * The backlight can be adjusted using the sysfs interface, and
+ * the backlight driver may also support adjusting backlight using
+ * a hot-key or some other platfrom or firmware specific way.
+ *
+ * The driver shall implement the get_brightness() operation if
+ * the HW do not support all the levels that can be specified in
+ * brightness, thus providing user-space access to the actual level
+ * via the actual_brightness attribute.
+ * When the backlight changes this is reported to user-space using
+ * an uevent connected to the actual_brightness attribute.
+ * When brightness is set by platform specific means, for example
+ * a hot-key to adjust backlight, the driver must notify the backlight
+ * core that brightness has changed using backlight_force_update().
+ *
+ * The backlight driver core receives notifications from fbdev and
+ * if the event is FB_EVENT_BLANK and if the value of blank, from the
+ * FBIOBLANK ioclt, results in a change in the backlight state the
+ * update_status() operation is called.
+ */
+
 static struct list_head backlight_dev_list;
 static struct mutex backlight_dev_list_mutex;
 static struct blocking_notifier_head backlight_notifier;
@@ -40,9 +80,17 @@ static const char *const backlight_scale_types[] = {
 
 #if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \
 			   defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE))
-/* This callback gets called when something important happens inside a
- * framebuffer driver. We're looking if that important event is blanking,
- * and if it is and necessary, we're switching backlight power as well ...
+/*
+ * fb_notifier_callback
+ *
+ * This callback gets called when something important happens inside a
+ * framebuffer driver. The backlight core only cares about FB_BLANK_UNBLANK
+ * which is reported to the driver using backlight_update_status()
+ * as a state change.
+ *
+ * There may be several fbdev's connected to the backlight device,
+ * in which case they are kept track of. A state change is only reported
+ * if there is a change in backlight for the specified fbdev.
  */
 static int fb_notifier_callback(struct notifier_block *self,
 				unsigned long event, void *data)
@@ -318,12 +366,15 @@ static struct attribute *bl_device_attrs[] = {
 ATTRIBUTE_GROUPS(bl_device);
 
 /**
- * backlight_force_update - tell the backlight subsystem that hardware state
- *   has changed
+ * backlight_force_update - force an update due to a hardware change
  * @bd: the backlight device to update
+ * @reason: the method used for the backlight update
  *
  * Updates the internal state of the backlight in response to a hardware event,
- * and generate a uevent to notify userspace
+ * and generates an uevent to notify userspace. A backlight driver shall call
+ * backlight_force_update() when the backlight is changed using, for example,
+ * a hot-key. The updated brightness is read using get_brightness() and the
+ * brightness value is reported using an uevent.
  */
 void backlight_force_update(struct backlight_device *bd,
 			    enum backlight_update_reason reason)
@@ -336,19 +387,7 @@ void backlight_force_update(struct backlight_device *bd,
 }
 EXPORT_SYMBOL(backlight_force_update);
 
-/**
- * backlight_device_register - create and register a new object of
- *   backlight_device class.
- * @name: the name of the new object(must be the same as the name of the
- *   respective framebuffer device).
- * @parent: a pointer to the parent device
- * @devdata: an optional pointer to be stored for private driver use. The
- *   methods may retrieve it by using bl_get_data(bd).
- * @ops: the backlight operations structure.
- *
- * Creates and registers new backlight device. Returns either an
- * ERR_PTR() or a pointer to the newly allocated device.
- */
+/* deprecated - use devm_backlight_device_register() */
 struct backlight_device *backlight_device_register(const char *name,
 	struct device *parent, void *devdata, const struct backlight_ops *ops,
 	const struct backlight_properties *props)
@@ -415,6 +454,15 @@ struct backlight_device *backlight_device_register(const char *name,
 }
 EXPORT_SYMBOL(backlight_device_register);
 
+/** backlight_device_get_by_type - find first backlight device of a type
+ * @type: the type of backlight device
+ *
+ * Look up the first backlight device of the specified type
+ *
+ * RETURNS:
+ *
+ * Pointer to backlight device if any was found. Otherwise NULL.
+ */
 struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
 {
 	bool found = false;
@@ -433,12 +481,7 @@ struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
 }
 EXPORT_SYMBOL(backlight_device_get_by_type);
 
-/**
- * backlight_device_unregister - unregisters a backlight device object.
- * @bd: the backlight device object to be unregistered and freed.
- *
- * Unregisters a previously registered via backlight_device_register object.
- */
+/* deprecated - use devm_backlight_device_unregister() */
 void backlight_device_unregister(struct backlight_device *bd)
 {
 	if (!bd)
@@ -486,10 +529,12 @@ static int devm_backlight_device_match(struct device *dev, void *res,
  * backlight_register_notifier - get notified of backlight (un)registration
  * @nb: notifier block with the notifier to call on backlight (un)registration
  *
- * @return 0 on success, otherwise a negative error code
- *
  * Register a notifier to get notified when backlight devices get registered
  * or unregistered.
+ *
+ * RETURNS:
+ *
+ * 0 on success, otherwise a negative error code
  */
 int backlight_register_notifier(struct notifier_block *nb)
 {
@@ -501,10 +546,12 @@ EXPORT_SYMBOL(backlight_register_notifier);
  * backlight_unregister_notifier - unregister a backlight notifier
  * @nb: notifier block to unregister
  *
- * @return 0 on success, otherwise a negative error code
- *
  * Register a notifier to get notified when backlight devices get registered
  * or unregistered.
+ *
+ * RETURNS:
+ *
+ * 0 on success, otherwise a negative error code
  */
 int backlight_unregister_notifier(struct notifier_block *nb)
 {
@@ -513,20 +560,22 @@ int backlight_unregister_notifier(struct notifier_block *nb)
 EXPORT_SYMBOL(backlight_unregister_notifier);
 
 /**
- * devm_backlight_device_register - resource managed backlight_device_register()
+ * devm_backlight_device_register - register a new backlight device
  * @dev: the device to register
  * @name: the name of the device
- * @parent: a pointer to the parent device
+ * @parent: a pointer to the parent device (often the same as @dev)
  * @devdata: an optional pointer to be stored for private driver use
  * @ops: the backlight operations structure
  * @props: the backlight properties
  *
- * @return a struct backlight on success, or an ERR_PTR on error
+ * Creates and registers new backlight device. When a backlight device
+ * is registered the configuration must be specified in the @props
+ * parameter. See description of &backlight_properties.
  *
- * Managed backlight_device_register(). The backlight_device returned
- * from this function are automatically freed on driver detach.
- * See backlight_device_register() for more information.
- */
+ * RETURNS:
+ *
+ * struct backlight on success, or an ERR_PTR on error
+*/
 struct backlight_device *devm_backlight_device_register(struct device *dev,
 	const char *name, struct device *parent, void *devdata,
 	const struct backlight_ops *ops,
@@ -553,13 +602,13 @@ struct backlight_device *devm_backlight_device_register(struct device *dev,
 EXPORT_SYMBOL(devm_backlight_device_register);
 
 /**
- * devm_backlight_device_unregister - resource managed backlight_device_unregister()
+ * devm_backlight_device_unregister - unregister backlight device
  * @dev: the device to unregister
  * @bd: the backlight device to unregister
  *
- * Deallocated a backlight allocated with devm_backlight_device_register().
+ * Deallocates a backlight allocated with devm_backlight_device_register().
  * Normally this function will not need to be called and the resource management
- * code will ensure that the resource is freed.
+ * code will ensure that the resources are freed.
  */
 void devm_backlight_device_unregister(struct device *dev,
 				struct backlight_device *bd)
@@ -650,8 +699,8 @@ static void devm_backlight_release(void *data)
 }
 
 /**
- * devm_of_find_backlight - Resource-managed of_find_backlight()
- * @dev: Device
+ * devm_of_find_backlight - find backlight for a device
+ * @dev: the device
  *
  * Device managed version of of_find_backlight().
  * The reference on the backlight device is automatically
-- 
2.25.1

[PATCH v3 10/13] backlight: add overview and update existing doc

[Sam Ravnborg]

Add overview chapter to backlight.c.
Update existing kernel-doc to follow a more consistent
style and drop kernel-doc for deprecated functions.

v2:
  - Sevaral editorial corrections that makes reading
    much easier (Daniel)
  - Spelling fixes (Daniel)
  - updated intro chapter with a little more info

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 drivers/video/backlight/backlight.c | 131 +++++++++++++++++++---------
 1 file changed, 90 insertions(+), 41 deletions(-)

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 17f04cff50ab..06bcddd76a7e 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -22,6 +22,46 @@
 #include <asm/backlight.h>
 #endif
 
+/**
+ * DOC: overview
+ *
+ * The backlight core supports implementing backlight drivers.
+ *
+ * A backlight driver registers a driver using
+ * devm_backlight_device_register(). The properties of the backlight
+ * driver such as type and max_brightness must be specified.
+ * When the core detect changes in for example brightness or power state
+ * the update_status() operation is called. The backlight driver shall
+ * implement this operation and use it to adjust backlight.
+ *
+ * Several sysfs attributes are provided by the backlight core::
+ *
+ * - brightness         R/W, set the requested brightness level
+ * - actual_brighness   RO, the brightness level used by the HW
+ * - max_brightness     RO, the maximum  brightness level supported
+ *
+ * See Documentation/ABI/stable/sysfs-class-backlight for the full list.
+ *
+ * The backlight can be adjusted using the sysfs interface, and
+ * the backlight driver may also support adjusting backlight using
+ * a hot-key or some other platfrom or firmware specific way.
+ *
+ * The driver shall implement the get_brightness() operation if
+ * the HW do not support all the levels that can be specified in
+ * brightness, thus providing user-space access to the actual level
+ * via the actual_brightness attribute.
+ * When the backlight changes this is reported to user-space using
+ * an uevent connected to the actual_brightness attribute.
+ * When brightness is set by platform specific means, for example
+ * a hot-key to adjust backlight, the driver must notify the backlight
+ * core that brightness has changed using backlight_force_update().
+ *
+ * The backlight driver core receives notifications from fbdev and
+ * if the event is FB_EVENT_BLANK and if the value of blank, from the
+ * FBIOBLANK ioclt, results in a change in the backlight state the
+ * update_status() operation is called.
+ */
+
 static struct list_head backlight_dev_list;
 static struct mutex backlight_dev_list_mutex;
 static struct blocking_notifier_head backlight_notifier;
@@ -40,9 +80,17 @@ static const char *const backlight_scale_types[] = {
 
 #if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \
 			   defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE))
-/* This callback gets called when something important happens inside a
- * framebuffer driver. We're looking if that important event is blanking,
- * and if it is and necessary, we're switching backlight power as well ...
+/*
+ * fb_notifier_callback
+ *
+ * This callback gets called when something important happens inside a
+ * framebuffer driver. The backlight core only cares about FB_BLANK_UNBLANK
+ * which is reported to the driver using backlight_update_status()
+ * as a state change.
+ *
+ * There may be several fbdev's connected to the backlight device,
+ * in which case they are kept track of. A state change is only reported
+ * if there is a change in backlight for the specified fbdev.
  */
 static int fb_notifier_callback(struct notifier_block *self,
 				unsigned long event, void *data)
@@ -318,12 +366,15 @@ static struct attribute *bl_device_attrs[] = {
 ATTRIBUTE_GROUPS(bl_device);
 
 /**
- * backlight_force_update - tell the backlight subsystem that hardware state
- *   has changed
+ * backlight_force_update - force an update due to a hardware change
  * @bd: the backlight device to update
+ * @reason: the method used for the backlight update
  *
  * Updates the internal state of the backlight in response to a hardware event,
- * and generate a uevent to notify userspace
+ * and generates an uevent to notify userspace. A backlight driver shall call
+ * backlight_force_update() when the backlight is changed using, for example,
+ * a hot-key. The updated brightness is read using get_brightness() and the
+ * brightness value is reported using an uevent.
  */
 void backlight_force_update(struct backlight_device *bd,
 			    enum backlight_update_reason reason)
@@ -336,19 +387,7 @@ void backlight_force_update(struct backlight_device *bd,
 }
 EXPORT_SYMBOL(backlight_force_update);
 
-/**
- * backlight_device_register - create and register a new object of
- *   backlight_device class.
- * @name: the name of the new object(must be the same as the name of the
- *   respective framebuffer device).
- * @parent: a pointer to the parent device
- * @devdata: an optional pointer to be stored for private driver use. The
- *   methods may retrieve it by using bl_get_data(bd).
- * @ops: the backlight operations structure.
- *
- * Creates and registers new backlight device. Returns either an
- * ERR_PTR() or a pointer to the newly allocated device.
- */
+/* deprecated - use devm_backlight_device_register() */
 struct backlight_device *backlight_device_register(const char *name,
 	struct device *parent, void *devdata, const struct backlight_ops *ops,
 	const struct backlight_properties *props)
@@ -415,6 +454,15 @@ struct backlight_device *backlight_device_register(const char *name,
 }
 EXPORT_SYMBOL(backlight_device_register);
 
+/** backlight_device_get_by_type - find first backlight device of a type
+ * @type: the type of backlight device
+ *
+ * Look up the first backlight device of the specified type
+ *
+ * RETURNS:
+ *
+ * Pointer to backlight device if any was found. Otherwise NULL.
+ */
 struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
 {
 	bool found = false;
@@ -433,12 +481,7 @@ struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
 }
 EXPORT_SYMBOL(backlight_device_get_by_type);
 
-/**
- * backlight_device_unregister - unregisters a backlight device object.
- * @bd: the backlight device object to be unregistered and freed.
- *
- * Unregisters a previously registered via backlight_device_register object.
- */
+/* deprecated - use devm_backlight_device_unregister() */
 void backlight_device_unregister(struct backlight_device *bd)
 {
 	if (!bd)
@@ -486,10 +529,12 @@ static int devm_backlight_device_match(struct device *dev, void *res,
  * backlight_register_notifier - get notified of backlight (un)registration
  * @nb: notifier block with the notifier to call on backlight (un)registration
  *
- * @return 0 on success, otherwise a negative error code
- *
  * Register a notifier to get notified when backlight devices get registered
  * or unregistered.
+ *
+ * RETURNS:
+ *
+ * 0 on success, otherwise a negative error code
  */
 int backlight_register_notifier(struct notifier_block *nb)
 {
@@ -501,10 +546,12 @@ EXPORT_SYMBOL(backlight_register_notifier);
  * backlight_unregister_notifier - unregister a backlight notifier
  * @nb: notifier block to unregister
  *
- * @return 0 on success, otherwise a negative error code
- *
  * Register a notifier to get notified when backlight devices get registered
  * or unregistered.
+ *
+ * RETURNS:
+ *
+ * 0 on success, otherwise a negative error code
  */
 int backlight_unregister_notifier(struct notifier_block *nb)
 {
@@ -513,20 +560,22 @@ int backlight_unregister_notifier(struct notifier_block *nb)
 EXPORT_SYMBOL(backlight_unregister_notifier);
 
 /**
- * devm_backlight_device_register - resource managed backlight_device_register()
+ * devm_backlight_device_register - register a new backlight device
  * @dev: the device to register
  * @name: the name of the device
- * @parent: a pointer to the parent device
+ * @parent: a pointer to the parent device (often the same as @dev)
  * @devdata: an optional pointer to be stored for private driver use
  * @ops: the backlight operations structure
  * @props: the backlight properties
  *
- * @return a struct backlight on success, or an ERR_PTR on error
+ * Creates and registers new backlight device. When a backlight device
+ * is registered the configuration must be specified in the @props
+ * parameter. See description of &backlight_properties.
  *
- * Managed backlight_device_register(). The backlight_device returned
- * from this function are automatically freed on driver detach.
- * See backlight_device_register() for more information.
- */
+ * RETURNS:
+ *
+ * struct backlight on success, or an ERR_PTR on error
+*/
 struct backlight_device *devm_backlight_device_register(struct device *dev,
 	const char *name, struct device *parent, void *devdata,
 	const struct backlight_ops *ops,
@@ -553,13 +602,13 @@ struct backlight_device *devm_backlight_device_register(struct device *dev,
 EXPORT_SYMBOL(devm_backlight_device_register);
 
 /**
- * devm_backlight_device_unregister - resource managed backlight_device_unregister()
+ * devm_backlight_device_unregister - unregister backlight device
  * @dev: the device to unregister
  * @bd: the backlight device to unregister
  *
- * Deallocated a backlight allocated with devm_backlight_device_register().
+ * Deallocates a backlight allocated with devm_backlight_device_register().
  * Normally this function will not need to be called and the resource management
- * code will ensure that the resource is freed.
+ * code will ensure that the resources are freed.
  */
 void devm_backlight_device_unregister(struct device *dev,
 				struct backlight_device *bd)
@@ -650,8 +699,8 @@ static void devm_backlight_release(void *data)
 }
 
 /**
- * devm_of_find_backlight - Resource-managed of_find_backlight()
- * @dev: Device
+ * devm_of_find_backlight - find backlight for a device
+ * @dev: the device
  *
  * Device managed version of of_find_backlight().
  * The reference on the backlight device is automatically
-- 
2.25.1

[PATCH v3 10/13] backlight: add overview and update existing doc

[Sam Ravnborg]

Add overview chapter to backlight.c.
Update existing kernel-doc to follow a more consistent
style and drop kernel-doc for deprecated functions.

v2:
  - Sevaral editorial corrections that makes reading
    much easier (Daniel)
  - Spelling fixes (Daniel)
  - updated intro chapter with a little more info

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
---
 drivers/video/backlight/backlight.c | 131 +++++++++++++++++++---------
 1 file changed, 90 insertions(+), 41 deletions(-)

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 17f04cff50ab..06bcddd76a7e 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -22,6 +22,46 @@
 #include <asm/backlight.h>
 #endif
 
+/**
+ * DOC: overview
+ *
+ * The backlight core supports implementing backlight drivers.
+ *
+ * A backlight driver registers a driver using
+ * devm_backlight_device_register(). The properties of the backlight
+ * driver such as type and max_brightness must be specified.
+ * When the core detect changes in for example brightness or power state
+ * the update_status() operation is called. The backlight driver shall
+ * implement this operation and use it to adjust backlight.
+ *
+ * Several sysfs attributes are provided by the backlight core::
+ *
+ * - brightness         R/W, set the requested brightness level
+ * - actual_brighness   RO, the brightness level used by the HW
+ * - max_brightness     RO, the maximum  brightness level supported
+ *
+ * See Documentation/ABI/stable/sysfs-class-backlight for the full list.
+ *
+ * The backlight can be adjusted using the sysfs interface, and
+ * the backlight driver may also support adjusting backlight using
+ * a hot-key or some other platfrom or firmware specific way.
+ *
+ * The driver shall implement the get_brightness() operation if
+ * the HW do not support all the levels that can be specified in
+ * brightness, thus providing user-space access to the actual level
+ * via the actual_brightness attribute.
+ * When the backlight changes this is reported to user-space using
+ * an uevent connected to the actual_brightness attribute.
+ * When brightness is set by platform specific means, for example
+ * a hot-key to adjust backlight, the driver must notify the backlight
+ * core that brightness has changed using backlight_force_update().
+ *
+ * The backlight driver core receives notifications from fbdev and
+ * if the event is FB_EVENT_BLANK and if the value of blank, from the
+ * FBIOBLANK ioclt, results in a change in the backlight state the
+ * update_status() operation is called.
+ */
+
 static struct list_head backlight_dev_list;
 static struct mutex backlight_dev_list_mutex;
 static struct blocking_notifier_head backlight_notifier;
@@ -40,9 +80,17 @@ static const char *const backlight_scale_types[] = {
 
 #if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \
 			   defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE))
-/* This callback gets called when something important happens inside a
- * framebuffer driver. We're looking if that important event is blanking,
- * and if it is and necessary, we're switching backlight power as well ...
+/*
+ * fb_notifier_callback
+ *
+ * This callback gets called when something important happens inside a
+ * framebuffer driver. The backlight core only cares about FB_BLANK_UNBLANK
+ * which is reported to the driver using backlight_update_status()
+ * as a state change.
+ *
+ * There may be several fbdev's connected to the backlight device,
+ * in which case they are kept track of. A state change is only reported
+ * if there is a change in backlight for the specified fbdev.
  */
 static int fb_notifier_callback(struct notifier_block *self,
 				unsigned long event, void *data)
@@ -318,12 +366,15 @@ static struct attribute *bl_device_attrs[] = {
 ATTRIBUTE_GROUPS(bl_device);
 
 /**
- * backlight_force_update - tell the backlight subsystem that hardware state
- *   has changed
+ * backlight_force_update - force an update due to a hardware change
  * @bd: the backlight device to update
+ * @reason: the method used for the backlight update
  *
  * Updates the internal state of the backlight in response to a hardware event,
- * and generate a uevent to notify userspace
+ * and generates an uevent to notify userspace. A backlight driver shall call
+ * backlight_force_update() when the backlight is changed using, for example,
+ * a hot-key. The updated brightness is read using get_brightness() and the
+ * brightness value is reported using an uevent.
  */
 void backlight_force_update(struct backlight_device *bd,
 			    enum backlight_update_reason reason)
@@ -336,19 +387,7 @@ void backlight_force_update(struct backlight_device *bd,
 }
 EXPORT_SYMBOL(backlight_force_update);
 
-/**
- * backlight_device_register - create and register a new object of
- *   backlight_device class.
- * @name: the name of the new object(must be the same as the name of the
- *   respective framebuffer device).
- * @parent: a pointer to the parent device
- * @devdata: an optional pointer to be stored for private driver use. The
- *   methods may retrieve it by using bl_get_data(bd).
- * @ops: the backlight operations structure.
- *
- * Creates and registers new backlight device. Returns either an
- * ERR_PTR() or a pointer to the newly allocated device.
- */
+/* deprecated - use devm_backlight_device_register() */
 struct backlight_device *backlight_device_register(const char *name,
 	struct device *parent, void *devdata, const struct backlight_ops *ops,
 	const struct backlight_properties *props)
@@ -415,6 +454,15 @@ struct backlight_device *backlight_device_register(const char *name,
 }
 EXPORT_SYMBOL(backlight_device_register);
 
+/** backlight_device_get_by_type - find first backlight device of a type
+ * @type: the type of backlight device
+ *
+ * Look up the first backlight device of the specified type
+ *
+ * RETURNS:
+ *
+ * Pointer to backlight device if any was found. Otherwise NULL.
+ */
 struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
 {
 	bool found = false;
@@ -433,12 +481,7 @@ struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
 }
 EXPORT_SYMBOL(backlight_device_get_by_type);
 
-/**
- * backlight_device_unregister - unregisters a backlight device object.
- * @bd: the backlight device object to be unregistered and freed.
- *
- * Unregisters a previously registered via backlight_device_register object.
- */
+/* deprecated - use devm_backlight_device_unregister() */
 void backlight_device_unregister(struct backlight_device *bd)
 {
 	if (!bd)
@@ -486,10 +529,12 @@ static int devm_backlight_device_match(struct device *dev, void *res,
  * backlight_register_notifier - get notified of backlight (un)registration
  * @nb: notifier block with the notifier to call on backlight (un)registration
  *
- * @return 0 on success, otherwise a negative error code
- *
  * Register a notifier to get notified when backlight devices get registered
  * or unregistered.
+ *
+ * RETURNS:
+ *
+ * 0 on success, otherwise a negative error code
  */
 int backlight_register_notifier(struct notifier_block *nb)
 {
@@ -501,10 +546,12 @@ EXPORT_SYMBOL(backlight_register_notifier);
  * backlight_unregister_notifier - unregister a backlight notifier
  * @nb: notifier block to unregister
  *
- * @return 0 on success, otherwise a negative error code
- *
  * Register a notifier to get notified when backlight devices get registered
  * or unregistered.
+ *
+ * RETURNS:
+ *
+ * 0 on success, otherwise a negative error code
  */
 int backlight_unregister_notifier(struct notifier_block *nb)
 {
@@ -513,20 +560,22 @@ int backlight_unregister_notifier(struct notifier_block *nb)
 EXPORT_SYMBOL(backlight_unregister_notifier);
 
 /**
- * devm_backlight_device_register - resource managed backlight_device_register()
+ * devm_backlight_device_register - register a new backlight device
  * @dev: the device to register
  * @name: the name of the device
- * @parent: a pointer to the parent device
+ * @parent: a pointer to the parent device (often the same as @dev)
  * @devdata: an optional pointer to be stored for private driver use
  * @ops: the backlight operations structure
  * @props: the backlight properties
  *
- * @return a struct backlight on success, or an ERR_PTR on error
+ * Creates and registers new backlight device. When a backlight device
+ * is registered the configuration must be specified in the @props
+ * parameter. See description of &backlight_properties.
  *
- * Managed backlight_device_register(). The backlight_device returned
- * from this function are automatically freed on driver detach.
- * See backlight_device_register() for more information.
- */
+ * RETURNS:
+ *
+ * struct backlight on success, or an ERR_PTR on error
+*/
 struct backlight_device *devm_backlight_device_register(struct device *dev,
 	const char *name, struct device *parent, void *devdata,
 	const struct backlight_ops *ops,
@@ -553,13 +602,13 @@ struct backlight_device *devm_backlight_device_register(struct device *dev,
 EXPORT_SYMBOL(devm_backlight_device_register);
 
 /**
- * devm_backlight_device_unregister - resource managed backlight_device_unregister()
+ * devm_backlight_device_unregister - unregister backlight device
  * @dev: the device to unregister
  * @bd: the backlight device to unregister
  *
- * Deallocated a backlight allocated with devm_backlight_device_register().
+ * Deallocates a backlight allocated with devm_backlight_device_register().
  * Normally this function will not need to be called and the resource management
- * code will ensure that the resource is freed.
+ * code will ensure that the resources are freed.
  */
 void devm_backlight_device_unregister(struct device *dev,
 				struct backlight_device *bd)
@@ -650,8 +699,8 @@ static void devm_backlight_release(void *data)
 }
 
 /**
- * devm_of_find_backlight - Resource-managed of_find_backlight()
- * @dev: Device
+ * devm_of_find_backlight - find backlight for a device
+ * @dev: the device
  *
  * Device managed version of of_find_backlight().
  * The reference on the backlight device is automatically
-- 
2.25.1

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v3 11/13] backlight: wire up kernel-doc documentation

[Sam Ravnborg]

Include backlight so the documentation is now generated
with make htmldocs and friends.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Jonathan Corbet <corbet@lwn.net>
---
 Documentation/gpu/backlight.rst | 12 ++++++++++++
 Documentation/gpu/index.rst     |  1 +
 2 files changed, 13 insertions(+)
 create mode 100644 Documentation/gpu/backlight.rst

diff --git a/Documentation/gpu/backlight.rst b/Documentation/gpu/backlight.rst
new file mode 100644
index 000000000000..9ebfc9d0aced
--- /dev/null
+++ b/Documentation/gpu/backlight.rst
@@ -0,0 +1,12 @@
+=================
+Backlight support
+=================
+
+.. kernel-doc:: drivers/video/backlight/backlight.c
+   :doc: overview
+
+.. kernel-doc:: include/linux/backlight.h
+   :internal:
+
+.. kernel-doc:: drivers/video/backlight/backlight.c
+   :export:
diff --git a/Documentation/gpu/index.rst b/Documentation/gpu/index.rst
index 1fcf8e851e15..c9a51e3bfb5a 100644
--- a/Documentation/gpu/index.rst
+++ b/Documentation/gpu/index.rst
@@ -12,6 +12,7 @@ Linux GPU Driver Developer's Guide
    drm-uapi
    drm-client
    drivers
+   backlight
    vga-switcheroo
    vgaarbiter
    todo
-- 
2.25.1

[PATCH v3 11/13] backlight: wire up kernel-doc documentation

[Sam Ravnborg]

Include backlight so the documentation is now generated
with make htmldocs and friends.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Jonathan Corbet <corbet@lwn.net>
---
 Documentation/gpu/backlight.rst | 12 ++++++++++++
 Documentation/gpu/index.rst     |  1 +
 2 files changed, 13 insertions(+)
 create mode 100644 Documentation/gpu/backlight.rst

diff --git a/Documentation/gpu/backlight.rst b/Documentation/gpu/backlight.rst
new file mode 100644
index 000000000000..9ebfc9d0aced
--- /dev/null
+++ b/Documentation/gpu/backlight.rst
@@ -0,0 +1,12 @@
+=================
+Backlight support
+=================
+
+.. kernel-doc:: drivers/video/backlight/backlight.c
+   :doc: overview
+
+.. kernel-doc:: include/linux/backlight.h
+   :internal:
+
+.. kernel-doc:: drivers/video/backlight/backlight.c
+   :export:
diff --git a/Documentation/gpu/index.rst b/Documentation/gpu/index.rst
index 1fcf8e851e15..c9a51e3bfb5a 100644
--- a/Documentation/gpu/index.rst
+++ b/Documentation/gpu/index.rst
@@ -12,6 +12,7 @@ Linux GPU Driver Developer's Guide
    drm-uapi
    drm-client
    drivers
+   backlight
    vga-switcheroo
    vgaarbiter
    todo
-- 
2.25.1

[PATCH v3 11/13] backlight: wire up kernel-doc documentation

[Sam Ravnborg]

Include backlight so the documentation is now generated
with make htmldocs and friends.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Jonathan Corbet <corbet@lwn.net>
---
 Documentation/gpu/backlight.rst | 12 ++++++++++++
 Documentation/gpu/index.rst     |  1 +
 2 files changed, 13 insertions(+)
 create mode 100644 Documentation/gpu/backlight.rst

diff --git a/Documentation/gpu/backlight.rst b/Documentation/gpu/backlight.rst
new file mode 100644
index 000000000000..9ebfc9d0aced
--- /dev/null
+++ b/Documentation/gpu/backlight.rst
@@ -0,0 +1,12 @@
+=================
+Backlight support
+=================
+
+.. kernel-doc:: drivers/video/backlight/backlight.c
+   :doc: overview
+
+.. kernel-doc:: include/linux/backlight.h
+   :internal:
+
+.. kernel-doc:: drivers/video/backlight/backlight.c
+   :export:
diff --git a/Documentation/gpu/index.rst b/Documentation/gpu/index.rst
index 1fcf8e851e15..c9a51e3bfb5a 100644
--- a/Documentation/gpu/index.rst
+++ b/Documentation/gpu/index.rst
@@ -12,6 +12,7 @@ Linux GPU Driver Developer's Guide
    drm-uapi
    drm-client
    drivers
+   backlight
    vga-switcheroo
    vgaarbiter
    todo
-- 
2.25.1

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v3 12/13] backlight: as3711_bl: introduce backlight_is_blank()

[Sam Ravnborg]

Replaces the open-coded checks of the state, with the
backlight_is_blank() helper. This increases readability
of the code and aling the functionality across the drivers.

Futhermore drop the debug prints in update_status().
If we need debug printing then we can add it to the backlight core.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
---
 drivers/video/backlight/as3711_bl.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/video/backlight/as3711_bl.c b/drivers/video/backlight/as3711_bl.c
index 33f0f0f2e8b3..cc5628beaffd 100644
--- a/drivers/video/backlight/as3711_bl.c
+++ b/drivers/video/backlight/as3711_bl.c
@@ -107,13 +107,7 @@ static int as3711_bl_update_status(struct backlight_device *bl)
 	int brightness = bl->props.brightness;
 	int ret = 0;
 
-	dev_dbg(&bl->dev, "%s(): brightness %u, pwr %x, blank %x, state %x\n",
-		__func__, bl->props.brightness, bl->props.power,
-		bl->props.fb_blank, bl->props.state);
-
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	if (data->type == AS3711_BL_SU1) {
-- 
2.25.1

[PATCH v3 12/13] backlight: as3711_bl: introduce backlight_is_blank()

[Sam Ravnborg]

Replaces the open-coded checks of the state, with the
backlight_is_blank() helper. This increases readability
of the code and aling the functionality across the drivers.

Futhermore drop the debug prints in update_status().
If we need debug printing then we can add it to the backlight core.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
---
 drivers/video/backlight/as3711_bl.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/video/backlight/as3711_bl.c b/drivers/video/backlight/as3711_bl.c
index 33f0f0f2e8b3..cc5628beaffd 100644
--- a/drivers/video/backlight/as3711_bl.c
+++ b/drivers/video/backlight/as3711_bl.c
@@ -107,13 +107,7 @@ static int as3711_bl_update_status(struct backlight_device *bl)
 	int brightness = bl->props.brightness;
 	int ret = 0;
 
-	dev_dbg(&bl->dev, "%s(): brightness %u, pwr %x, blank %x, state %x\n",
-		__func__, bl->props.brightness, bl->props.power,
-		bl->props.fb_blank, bl->props.state);
-
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	if (data->type == AS3711_BL_SU1) {
-- 
2.25.1

[PATCH v3 12/13] backlight: as3711_bl: introduce backlight_is_blank()

[Sam Ravnborg]

Replaces the open-coded checks of the state, with the
backlight_is_blank() helper. This increases readability
of the code and aling the functionality across the drivers.

Futhermore drop the debug prints in update_status().
If we need debug printing then we can add it to the backlight core.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
---
 drivers/video/backlight/as3711_bl.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/video/backlight/as3711_bl.c b/drivers/video/backlight/as3711_bl.c
index 33f0f0f2e8b3..cc5628beaffd 100644
--- a/drivers/video/backlight/as3711_bl.c
+++ b/drivers/video/backlight/as3711_bl.c
@@ -107,13 +107,7 @@ static int as3711_bl_update_status(struct backlight_device *bl)
 	int brightness = bl->props.brightness;
 	int ret = 0;
 
-	dev_dbg(&bl->dev, "%s(): brightness %u, pwr %x, blank %x, state %x\n",
-		__func__, bl->props.brightness, bl->props.power,
-		bl->props.fb_blank, bl->props.state);
-
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	if (data->type == AS3711_BL_SU1) {
-- 
2.25.1

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v3 13/13] backlight: use backlight_is_blank() in all backlight drivers

[Sam Ravnborg]

Replaces the open-coded checks of the state etc.,
with the backlight_is_blank() helper.
This increases readability of the code and align
the functionality across the drivers.

v3:
  - Dropped as3711_bl, it will be modified in another patch

v2:
  - Fixed so changelog is readable

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Michael Hennerich <michael.hennerich@analog.com>
Cc: Support Opensource <support.opensource@diasemi.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: linux-pwm@vger.kernel.org
Cc: linux-arm-msm@vger.kernel.org
Cc: patches@opensource.cirrus.com
---
 drivers/video/backlight/88pm860x_bl.c    |  8 +-------
 drivers/video/backlight/adp5520_bl.c     |  5 +----
 drivers/video/backlight/adp8860_bl.c     |  5 +----
 drivers/video/backlight/adp8870_bl.c     |  5 +----
 drivers/video/backlight/bd6107.c         |  4 +---
 drivers/video/backlight/corgi_lcd.c      |  5 +----
 drivers/video/backlight/cr_bllcd.c       | 22 +++++++---------------
 drivers/video/backlight/da903x_bl.c      |  8 +-------
 drivers/video/backlight/ep93xx_bl.c      |  3 +--
 drivers/video/backlight/gpio_backlight.c |  4 +---
 drivers/video/backlight/hp680_bl.c       |  4 +---
 drivers/video/backlight/jornada720_bl.c  |  2 +-
 drivers/video/backlight/kb3886_bl.c      |  4 +---
 drivers/video/backlight/led_bl.c         |  4 +---
 drivers/video/backlight/lm3533_bl.c      |  4 +---
 drivers/video/backlight/locomolcd.c      |  4 +---
 drivers/video/backlight/lv5207lp.c       |  4 +---
 drivers/video/backlight/max8925_bl.c     |  8 +-------
 drivers/video/backlight/pwm_bl.c         |  4 +---
 drivers/video/backlight/qcom-wled.c      |  4 +---
 drivers/video/backlight/tps65217_bl.c    |  4 +---
 drivers/video/backlight/wm831x_bl.c      |  8 +-------
 22 files changed, 28 insertions(+), 95 deletions(-)

diff --git a/drivers/video/backlight/88pm860x_bl.c b/drivers/video/backlight/88pm860x_bl.c
index 20d96a5ac384..162c83ab0f5a 100644
--- a/drivers/video/backlight/88pm860x_bl.c
+++ b/drivers/video/backlight/88pm860x_bl.c
@@ -123,13 +123,7 @@ static int pm860x_backlight_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.state & BL_CORE_SUSPENDED)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return pm860x_backlight_set(bl, brightness);
diff --git a/drivers/video/backlight/adp5520_bl.c b/drivers/video/backlight/adp5520_bl.c
index 0f63f76723a5..d817b0d95c9d 100644
--- a/drivers/video/backlight/adp5520_bl.c
+++ b/drivers/video/backlight/adp5520_bl.c
@@ -67,10 +67,7 @@ static int adp5520_bl_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return adp5520_bl_set(bl, brightness);
diff --git a/drivers/video/backlight/adp8860_bl.c b/drivers/video/backlight/adp8860_bl.c
index 19968104fc47..a0ce2a3701fa 100644
--- a/drivers/video/backlight/adp8860_bl.c
+++ b/drivers/video/backlight/adp8860_bl.c
@@ -363,10 +363,7 @@ static int adp8860_bl_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return adp8860_bl_set(bl, brightness);
diff --git a/drivers/video/backlight/adp8870_bl.c b/drivers/video/backlight/adp8870_bl.c
index 4c0032010cfe..ae4269fdb189 100644
--- a/drivers/video/backlight/adp8870_bl.c
+++ b/drivers/video/backlight/adp8870_bl.c
@@ -401,10 +401,7 @@ static int adp8870_bl_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return adp8870_bl_set(bl, brightness);
diff --git a/drivers/video/backlight/bd6107.c b/drivers/video/backlight/bd6107.c
index d5d5fb457e78..f6a5c1dba3bc 100644
--- a/drivers/video/backlight/bd6107.c
+++ b/drivers/video/backlight/bd6107.c
@@ -84,9 +84,7 @@ static int bd6107_backlight_update_status(struct backlight_device *backlight)
 	struct bd6107 *bd = bl_get_data(backlight);
 	int brightness = backlight->props.brightness;
 
-	if (backlight->props.power != FB_BLANK_UNBLANK ||
-	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
-	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+	if (backlight_is_blank(backlight))
 		brightness = 0;
 
 	if (brightness) {
diff --git a/drivers/video/backlight/corgi_lcd.c b/drivers/video/backlight/corgi_lcd.c
index 25ef0cbd7583..c9adf4e26355 100644
--- a/drivers/video/backlight/corgi_lcd.c
+++ b/drivers/video/backlight/corgi_lcd.c
@@ -422,10 +422,7 @@ static int corgi_bl_update_status(struct backlight_device *bd)
 	struct corgi_lcd *lcd = bl_get_data(bd);
 	int intensity = bd->props.brightness;
 
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		intensity = 0;
-
-	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bd))
 		intensity = 0;
 
 	if (corgibl_flags & CORGIBL_SUSPENDED)
diff --git a/drivers/video/backlight/cr_bllcd.c b/drivers/video/backlight/cr_bllcd.c
index 4624b7b7c6a6..d5ab7675f55c 100644
--- a/drivers/video/backlight/cr_bllcd.c
+++ b/drivers/video/backlight/cr_bllcd.c
@@ -59,26 +59,18 @@ struct cr_panel {
 
 static int cr_backlight_set_intensity(struct backlight_device *bd)
 {
-	int intensity = bd->props.brightness;
 	u32 addr = gpio_bar + CRVML_PANEL_PORT;
 	u32 cur = inl(addr);
 
-	if (bd->props.power == FB_BLANK_UNBLANK)
-		intensity = FB_BLANK_UNBLANK;
-	if (bd->props.fb_blank == FB_BLANK_UNBLANK)
-		intensity = FB_BLANK_UNBLANK;
-	if (bd->props.power == FB_BLANK_POWERDOWN)
-		intensity = FB_BLANK_POWERDOWN;
-	if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
-		intensity = FB_BLANK_POWERDOWN;
-
-	if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
-		cur &= ~CRVML_BACKLIGHT_OFF;
-		outl(cur, addr);
-	} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
+	if (backlight_is_blank(bd)) {
+		/* OFF */
 		cur |= CRVML_BACKLIGHT_OFF;
 		outl(cur, addr);
-	} /* anything else, don't bother */
+	} else {
+		/* FULL ON */
+		cur &= ~CRVML_BACKLIGHT_OFF;
+		outl(cur, addr);
+	}
 
 	return 0;
 }
diff --git a/drivers/video/backlight/da903x_bl.c b/drivers/video/backlight/da903x_bl.c
index 62540e4bdedb..ca351badfdcf 100644
--- a/drivers/video/backlight/da903x_bl.c
+++ b/drivers/video/backlight/da903x_bl.c
@@ -79,13 +79,7 @@ static int da903x_backlight_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.state & BL_CORE_SUSPENDED)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return da903x_backlight_set(bl, brightness);
diff --git a/drivers/video/backlight/ep93xx_bl.c b/drivers/video/backlight/ep93xx_bl.c
index 4149e0b2f83c..491185df1411 100644
--- a/drivers/video/backlight/ep93xx_bl.c
+++ b/drivers/video/backlight/ep93xx_bl.c
@@ -38,8 +38,7 @@ static int ep93xxbl_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return ep93xxbl_set(bl, brightness);
diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
index 75409ddfba3e..94b65e4d2aa0 100644
--- a/drivers/video/backlight/gpio_backlight.c
+++ b/drivers/video/backlight/gpio_backlight.c
@@ -25,9 +25,7 @@ static int gpio_backlight_get_next_brightness(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return brightness;
diff --git a/drivers/video/backlight/hp680_bl.c b/drivers/video/backlight/hp680_bl.c
index 8ea42b8d9bc8..01d805ca8415 100644
--- a/drivers/video/backlight/hp680_bl.c
+++ b/drivers/video/backlight/hp680_bl.c
@@ -35,9 +35,7 @@ static void hp680bl_send_intensity(struct backlight_device *bd)
 	u16 v;
 	int intensity = bd->props.brightness;
 
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		intensity = 0;
-	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bd))
 		intensity = 0;
 	if (hp680bl_suspended)
 		intensity = 0;
diff --git a/drivers/video/backlight/jornada720_bl.c b/drivers/video/backlight/jornada720_bl.c
index f0385f9cf9da..996f7ba3b373 100644
--- a/drivers/video/backlight/jornada720_bl.c
+++ b/drivers/video/backlight/jornada720_bl.c
@@ -54,7 +54,7 @@ static int jornada_bl_update_status(struct backlight_device *bd)
 	jornada_ssp_start();
 
 	/* If backlight is off then really turn it off */
-	if ((bd->props.power != FB_BLANK_UNBLANK) || (bd->props.fb_blank != FB_BLANK_UNBLANK)) {
+	if (backlight_is_blank(bd)) {
 		ret = jornada_ssp_byte(BRIGHTNESSOFF);
 		if (ret != TXDUMMY) {
 			dev_info(&bd->dev, "brightness off timeout\n");
diff --git a/drivers/video/backlight/kb3886_bl.c b/drivers/video/backlight/kb3886_bl.c
index 1dfe13c18925..a0fd5d3d82f5 100644
--- a/drivers/video/backlight/kb3886_bl.c
+++ b/drivers/video/backlight/kb3886_bl.c
@@ -89,9 +89,7 @@ static int kb3886bl_send_intensity(struct backlight_device *bd)
 {
 	int intensity = bd->props.brightness;
 
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		intensity = 0;
-	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bd))
 		intensity = 0;
 	if (kb3886bl_flags & KB3886BL_SUSPENDED)
 		intensity = 0;
diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c
index 3f66549997c8..c655ddd99cfb 100644
--- a/drivers/video/backlight/led_bl.c
+++ b/drivers/video/backlight/led_bl.c
@@ -56,9 +56,7 @@ static int led_bl_update_status(struct backlight_device *bl)
 	struct led_bl_data *priv = bl_get_data(bl);
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & BL_CORE_FBBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	if (brightness > 0)
diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
index ee09d1bd02b9..476146b62c4e 100644
--- a/drivers/video/backlight/lm3533_bl.c
+++ b/drivers/video/backlight/lm3533_bl.c
@@ -41,9 +41,7 @@ static int lm3533_bl_update_status(struct backlight_device *bd)
 	struct lm3533_bl *bl = bl_get_data(bd);
 	int brightness = bd->props.brightness;
 
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bd))
 		brightness = 0;
 
 	return lm3533_ctrlbank_set_brightness(&bl->cb, (u8)brightness);
diff --git a/drivers/video/backlight/locomolcd.c b/drivers/video/backlight/locomolcd.c
index cdc02e04f89d..8064cad8d683 100644
--- a/drivers/video/backlight/locomolcd.c
+++ b/drivers/video/backlight/locomolcd.c
@@ -113,9 +113,7 @@ static int locomolcd_set_intensity(struct backlight_device *bd)
 {
 	int intensity = bd->props.brightness;
 
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		intensity = 0;
-	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bd))
 		intensity = 0;
 	if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
 		intensity = 0;
diff --git a/drivers/video/backlight/lv5207lp.c b/drivers/video/backlight/lv5207lp.c
index c6ad73a784e2..ef8aa9803577 100644
--- a/drivers/video/backlight/lv5207lp.c
+++ b/drivers/video/backlight/lv5207lp.c
@@ -48,9 +48,7 @@ static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
 	struct lv5207lp *lv = bl_get_data(backlight);
 	int brightness = backlight->props.brightness;
 
-	if (backlight->props.power != FB_BLANK_UNBLANK ||
-	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
-	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+	if (backlight_is_blank(backlight))
 		brightness = 0;
 
 	if (brightness) {
diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c
index 97cc260ff9d1..b8af2c6407d3 100644
--- a/drivers/video/backlight/max8925_bl.c
+++ b/drivers/video/backlight/max8925_bl.c
@@ -66,13 +66,7 @@ static int max8925_backlight_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.state & BL_CORE_SUSPENDED)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return max8925_backlight_set(bl, brightness);
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 82b8d7594701..7d0ffcd37f07 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -111,9 +111,7 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
 	int brightness = bl->props.brightness;
 	struct pwm_state state;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & BL_CORE_FBBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	if (pb->notify)
diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
index 3d276b30a78c..9600f5d58ece 100644
--- a/drivers/video/backlight/qcom-wled.c
+++ b/drivers/video/backlight/qcom-wled.c
@@ -261,9 +261,7 @@ static int wled_update_status(struct backlight_device *bl)
 	u16 brightness = bl->props.brightness;
 	int rc = 0;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & BL_CORE_FBBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	mutex_lock(&wled->lock);
diff --git a/drivers/video/backlight/tps65217_bl.c b/drivers/video/backlight/tps65217_bl.c
index 762e3feed097..1041e5e62ee3 100644
--- a/drivers/video/backlight/tps65217_bl.c
+++ b/drivers/video/backlight/tps65217_bl.c
@@ -82,9 +82,7 @@ static int tps65217_bl_update_status(struct backlight_device *bl)
 	if (bl->props.state & BL_CORE_SUSPENDED)
 		brightness = 0;
 
-	if ((bl->props.power != FB_BLANK_UNBLANK) ||
-		(bl->props.fb_blank != FB_BLANK_UNBLANK))
-		/* framebuffer in low power mode or blanking active */
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	if (brightness > 0) {
diff --git a/drivers/video/backlight/wm831x_bl.c b/drivers/video/backlight/wm831x_bl.c
index e55977d54c15..dc2ab6c8b7f9 100644
--- a/drivers/video/backlight/wm831x_bl.c
+++ b/drivers/video/backlight/wm831x_bl.c
@@ -93,13 +93,7 @@ static int wm831x_backlight_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.state & BL_CORE_SUSPENDED)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return wm831x_backlight_set(bl, brightness);
-- 
2.25.1

[PATCH v3 13/13] backlight: use backlight_is_blank() in all backlight drivers

[Sam Ravnborg]

Replaces the open-coded checks of the state etc.,
with the backlight_is_blank() helper.
This increases readability of the code and align
the functionality across the drivers.

v3:
  - Dropped as3711_bl, it will be modified in another patch

v2:
  - Fixed so changelog is readable

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Michael Hennerich <michael.hennerich@analog.com>
Cc: Support Opensource <support.opensource@diasemi.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: linux-pwm@vger.kernel.org
Cc: linux-arm-msm@vger.kernel.org
Cc: patches@opensource.cirrus.com
---
 drivers/video/backlight/88pm860x_bl.c    |  8 +-------
 drivers/video/backlight/adp5520_bl.c     |  5 +----
 drivers/video/backlight/adp8860_bl.c     |  5 +----
 drivers/video/backlight/adp8870_bl.c     |  5 +----
 drivers/video/backlight/bd6107.c         |  4 +---
 drivers/video/backlight/corgi_lcd.c      |  5 +----
 drivers/video/backlight/cr_bllcd.c       | 22 +++++++---------------
 drivers/video/backlight/da903x_bl.c      |  8 +-------
 drivers/video/backlight/ep93xx_bl.c      |  3 +--
 drivers/video/backlight/gpio_backlight.c |  4 +---
 drivers/video/backlight/hp680_bl.c       |  4 +---
 drivers/video/backlight/jornada720_bl.c  |  2 +-
 drivers/video/backlight/kb3886_bl.c      |  4 +---
 drivers/video/backlight/led_bl.c         |  4 +---
 drivers/video/backlight/lm3533_bl.c      |  4 +---
 drivers/video/backlight/locomolcd.c      |  4 +---
 drivers/video/backlight/lv5207lp.c       |  4 +---
 drivers/video/backlight/max8925_bl.c     |  8 +-------
 drivers/video/backlight/pwm_bl.c         |  4 +---
 drivers/video/backlight/qcom-wled.c      |  4 +---
 drivers/video/backlight/tps65217_bl.c    |  4 +---
 drivers/video/backlight/wm831x_bl.c      |  8 +-------
 22 files changed, 28 insertions(+), 95 deletions(-)

diff --git a/drivers/video/backlight/88pm860x_bl.c b/drivers/video/backlight/88pm860x_bl.c
index 20d96a5ac384..162c83ab0f5a 100644
--- a/drivers/video/backlight/88pm860x_bl.c
+++ b/drivers/video/backlight/88pm860x_bl.c
@@ -123,13 +123,7 @@ static int pm860x_backlight_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.state & BL_CORE_SUSPENDED)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return pm860x_backlight_set(bl, brightness);
diff --git a/drivers/video/backlight/adp5520_bl.c b/drivers/video/backlight/adp5520_bl.c
index 0f63f76723a5..d817b0d95c9d 100644
--- a/drivers/video/backlight/adp5520_bl.c
+++ b/drivers/video/backlight/adp5520_bl.c
@@ -67,10 +67,7 @@ static int adp5520_bl_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return adp5520_bl_set(bl, brightness);
diff --git a/drivers/video/backlight/adp8860_bl.c b/drivers/video/backlight/adp8860_bl.c
index 19968104fc47..a0ce2a3701fa 100644
--- a/drivers/video/backlight/adp8860_bl.c
+++ b/drivers/video/backlight/adp8860_bl.c
@@ -363,10 +363,7 @@ static int adp8860_bl_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return adp8860_bl_set(bl, brightness);
diff --git a/drivers/video/backlight/adp8870_bl.c b/drivers/video/backlight/adp8870_bl.c
index 4c0032010cfe..ae4269fdb189 100644
--- a/drivers/video/backlight/adp8870_bl.c
+++ b/drivers/video/backlight/adp8870_bl.c
@@ -401,10 +401,7 @@ static int adp8870_bl_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return adp8870_bl_set(bl, brightness);
diff --git a/drivers/video/backlight/bd6107.c b/drivers/video/backlight/bd6107.c
index d5d5fb457e78..f6a5c1dba3bc 100644
--- a/drivers/video/backlight/bd6107.c
+++ b/drivers/video/backlight/bd6107.c
@@ -84,9 +84,7 @@ static int bd6107_backlight_update_status(struct backlight_device *backlight)
 	struct bd6107 *bd = bl_get_data(backlight);
 	int brightness = backlight->props.brightness;
 
-	if (backlight->props.power != FB_BLANK_UNBLANK ||
-	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
-	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+	if (backlight_is_blank(backlight))
 		brightness = 0;
 
 	if (brightness) {
diff --git a/drivers/video/backlight/corgi_lcd.c b/drivers/video/backlight/corgi_lcd.c
index 25ef0cbd7583..c9adf4e26355 100644
--- a/drivers/video/backlight/corgi_lcd.c
+++ b/drivers/video/backlight/corgi_lcd.c
@@ -422,10 +422,7 @@ static int corgi_bl_update_status(struct backlight_device *bd)
 	struct corgi_lcd *lcd = bl_get_data(bd);
 	int intensity = bd->props.brightness;
 
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		intensity = 0;
-
-	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bd))
 		intensity = 0;
 
 	if (corgibl_flags & CORGIBL_SUSPENDED)
diff --git a/drivers/video/backlight/cr_bllcd.c b/drivers/video/backlight/cr_bllcd.c
index 4624b7b7c6a6..d5ab7675f55c 100644
--- a/drivers/video/backlight/cr_bllcd.c
+++ b/drivers/video/backlight/cr_bllcd.c
@@ -59,26 +59,18 @@ struct cr_panel {
 
 static int cr_backlight_set_intensity(struct backlight_device *bd)
 {
-	int intensity = bd->props.brightness;
 	u32 addr = gpio_bar + CRVML_PANEL_PORT;
 	u32 cur = inl(addr);
 
-	if (bd->props.power == FB_BLANK_UNBLANK)
-		intensity = FB_BLANK_UNBLANK;
-	if (bd->props.fb_blank == FB_BLANK_UNBLANK)
-		intensity = FB_BLANK_UNBLANK;
-	if (bd->props.power == FB_BLANK_POWERDOWN)
-		intensity = FB_BLANK_POWERDOWN;
-	if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
-		intensity = FB_BLANK_POWERDOWN;
-
-	if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
-		cur &= ~CRVML_BACKLIGHT_OFF;
-		outl(cur, addr);
-	} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
+	if (backlight_is_blank(bd)) {
+		/* OFF */
 		cur |= CRVML_BACKLIGHT_OFF;
 		outl(cur, addr);
-	} /* anything else, don't bother */
+	} else {
+		/* FULL ON */
+		cur &= ~CRVML_BACKLIGHT_OFF;
+		outl(cur, addr);
+	}
 
 	return 0;
 }
diff --git a/drivers/video/backlight/da903x_bl.c b/drivers/video/backlight/da903x_bl.c
index 62540e4bdedb..ca351badfdcf 100644
--- a/drivers/video/backlight/da903x_bl.c
+++ b/drivers/video/backlight/da903x_bl.c
@@ -79,13 +79,7 @@ static int da903x_backlight_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.state & BL_CORE_SUSPENDED)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return da903x_backlight_set(bl, brightness);
diff --git a/drivers/video/backlight/ep93xx_bl.c b/drivers/video/backlight/ep93xx_bl.c
index 4149e0b2f83c..491185df1411 100644
--- a/drivers/video/backlight/ep93xx_bl.c
+++ b/drivers/video/backlight/ep93xx_bl.c
@@ -38,8 +38,7 @@ static int ep93xxbl_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return ep93xxbl_set(bl, brightness);
diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
index 75409ddfba3e..94b65e4d2aa0 100644
--- a/drivers/video/backlight/gpio_backlight.c
+++ b/drivers/video/backlight/gpio_backlight.c
@@ -25,9 +25,7 @@ static int gpio_backlight_get_next_brightness(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return brightness;
diff --git a/drivers/video/backlight/hp680_bl.c b/drivers/video/backlight/hp680_bl.c
index 8ea42b8d9bc8..01d805ca8415 100644
--- a/drivers/video/backlight/hp680_bl.c
+++ b/drivers/video/backlight/hp680_bl.c
@@ -35,9 +35,7 @@ static void hp680bl_send_intensity(struct backlight_device *bd)
 	u16 v;
 	int intensity = bd->props.brightness;
 
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		intensity = 0;
-	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bd))
 		intensity = 0;
 	if (hp680bl_suspended)
 		intensity = 0;
diff --git a/drivers/video/backlight/jornada720_bl.c b/drivers/video/backlight/jornada720_bl.c
index f0385f9cf9da..996f7ba3b373 100644
--- a/drivers/video/backlight/jornada720_bl.c
+++ b/drivers/video/backlight/jornada720_bl.c
@@ -54,7 +54,7 @@ static int jornada_bl_update_status(struct backlight_device *bd)
 	jornada_ssp_start();
 
 	/* If backlight is off then really turn it off */
-	if ((bd->props.power != FB_BLANK_UNBLANK) || (bd->props.fb_blank != FB_BLANK_UNBLANK)) {
+	if (backlight_is_blank(bd)) {
 		ret = jornada_ssp_byte(BRIGHTNESSOFF);
 		if (ret != TXDUMMY) {
 			dev_info(&bd->dev, "brightness off timeout\n");
diff --git a/drivers/video/backlight/kb3886_bl.c b/drivers/video/backlight/kb3886_bl.c
index 1dfe13c18925..a0fd5d3d82f5 100644
--- a/drivers/video/backlight/kb3886_bl.c
+++ b/drivers/video/backlight/kb3886_bl.c
@@ -89,9 +89,7 @@ static int kb3886bl_send_intensity(struct backlight_device *bd)
 {
 	int intensity = bd->props.brightness;
 
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		intensity = 0;
-	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bd))
 		intensity = 0;
 	if (kb3886bl_flags & KB3886BL_SUSPENDED)
 		intensity = 0;
diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c
index 3f66549997c8..c655ddd99cfb 100644
--- a/drivers/video/backlight/led_bl.c
+++ b/drivers/video/backlight/led_bl.c
@@ -56,9 +56,7 @@ static int led_bl_update_status(struct backlight_device *bl)
 	struct led_bl_data *priv = bl_get_data(bl);
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & BL_CORE_FBBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	if (brightness > 0)
diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
index ee09d1bd02b9..476146b62c4e 100644
--- a/drivers/video/backlight/lm3533_bl.c
+++ b/drivers/video/backlight/lm3533_bl.c
@@ -41,9 +41,7 @@ static int lm3533_bl_update_status(struct backlight_device *bd)
 	struct lm3533_bl *bl = bl_get_data(bd);
 	int brightness = bd->props.brightness;
 
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bd))
 		brightness = 0;
 
 	return lm3533_ctrlbank_set_brightness(&bl->cb, (u8)brightness);
diff --git a/drivers/video/backlight/locomolcd.c b/drivers/video/backlight/locomolcd.c
index cdc02e04f89d..8064cad8d683 100644
--- a/drivers/video/backlight/locomolcd.c
+++ b/drivers/video/backlight/locomolcd.c
@@ -113,9 +113,7 @@ static int locomolcd_set_intensity(struct backlight_device *bd)
 {
 	int intensity = bd->props.brightness;
 
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		intensity = 0;
-	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bd))
 		intensity = 0;
 	if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
 		intensity = 0;
diff --git a/drivers/video/backlight/lv5207lp.c b/drivers/video/backlight/lv5207lp.c
index c6ad73a784e2..ef8aa9803577 100644
--- a/drivers/video/backlight/lv5207lp.c
+++ b/drivers/video/backlight/lv5207lp.c
@@ -48,9 +48,7 @@ static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
 	struct lv5207lp *lv = bl_get_data(backlight);
 	int brightness = backlight->props.brightness;
 
-	if (backlight->props.power != FB_BLANK_UNBLANK ||
-	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
-	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+	if (backlight_is_blank(backlight))
 		brightness = 0;
 
 	if (brightness) {
diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c
index 97cc260ff9d1..b8af2c6407d3 100644
--- a/drivers/video/backlight/max8925_bl.c
+++ b/drivers/video/backlight/max8925_bl.c
@@ -66,13 +66,7 @@ static int max8925_backlight_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.state & BL_CORE_SUSPENDED)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return max8925_backlight_set(bl, brightness);
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 82b8d7594701..7d0ffcd37f07 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -111,9 +111,7 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
 	int brightness = bl->props.brightness;
 	struct pwm_state state;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & BL_CORE_FBBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	if (pb->notify)
diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
index 3d276b30a78c..9600f5d58ece 100644
--- a/drivers/video/backlight/qcom-wled.c
+++ b/drivers/video/backlight/qcom-wled.c
@@ -261,9 +261,7 @@ static int wled_update_status(struct backlight_device *bl)
 	u16 brightness = bl->props.brightness;
 	int rc = 0;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & BL_CORE_FBBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	mutex_lock(&wled->lock);
diff --git a/drivers/video/backlight/tps65217_bl.c b/drivers/video/backlight/tps65217_bl.c
index 762e3feed097..1041e5e62ee3 100644
--- a/drivers/video/backlight/tps65217_bl.c
+++ b/drivers/video/backlight/tps65217_bl.c
@@ -82,9 +82,7 @@ static int tps65217_bl_update_status(struct backlight_device *bl)
 	if (bl->props.state & BL_CORE_SUSPENDED)
 		brightness = 0;
 
-	if ((bl->props.power != FB_BLANK_UNBLANK) ||
-		(bl->props.fb_blank != FB_BLANK_UNBLANK))
-		/* framebuffer in low power mode or blanking active */
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	if (brightness > 0) {
diff --git a/drivers/video/backlight/wm831x_bl.c b/drivers/video/backlight/wm831x_bl.c
index e55977d54c15..dc2ab6c8b7f9 100644
--- a/drivers/video/backlight/wm831x_bl.c
+++ b/drivers/video/backlight/wm831x_bl.c
@@ -93,13 +93,7 @@ static int wm831x_backlight_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.state & BL_CORE_SUSPENDED)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return wm831x_backlight_set(bl, brightness);
-- 
2.25.1

[PATCH v3 13/13] backlight: use backlight_is_blank() in all backlight drivers

[Sam Ravnborg]

Replaces the open-coded checks of the state etc.,
with the backlight_is_blank() helper.
This increases readability of the code and align
the functionality across the drivers.

v3:
  - Dropped as3711_bl, it will be modified in another patch

v2:
  - Fixed so changelog is readable

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Michael Hennerich <michael.hennerich@analog.com>
Cc: Support Opensource <support.opensource@diasemi.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: linux-pwm@vger.kernel.org
Cc: linux-arm-msm@vger.kernel.org
Cc: patches@opensource.cirrus.com
---
 drivers/video/backlight/88pm860x_bl.c    |  8 +-------
 drivers/video/backlight/adp5520_bl.c     |  5 +----
 drivers/video/backlight/adp8860_bl.c     |  5 +----
 drivers/video/backlight/adp8870_bl.c     |  5 +----
 drivers/video/backlight/bd6107.c         |  4 +---
 drivers/video/backlight/corgi_lcd.c      |  5 +----
 drivers/video/backlight/cr_bllcd.c       | 22 +++++++---------------
 drivers/video/backlight/da903x_bl.c      |  8 +-------
 drivers/video/backlight/ep93xx_bl.c      |  3 +--
 drivers/video/backlight/gpio_backlight.c |  4 +---
 drivers/video/backlight/hp680_bl.c       |  4 +---
 drivers/video/backlight/jornada720_bl.c  |  2 +-
 drivers/video/backlight/kb3886_bl.c      |  4 +---
 drivers/video/backlight/led_bl.c         |  4 +---
 drivers/video/backlight/lm3533_bl.c      |  4 +---
 drivers/video/backlight/locomolcd.c      |  4 +---
 drivers/video/backlight/lv5207lp.c       |  4 +---
 drivers/video/backlight/max8925_bl.c     |  8 +-------
 drivers/video/backlight/pwm_bl.c         |  4 +---
 drivers/video/backlight/qcom-wled.c      |  4 +---
 drivers/video/backlight/tps65217_bl.c    |  4 +---
 drivers/video/backlight/wm831x_bl.c      |  8 +-------
 22 files changed, 28 insertions(+), 95 deletions(-)

diff --git a/drivers/video/backlight/88pm860x_bl.c b/drivers/video/backlight/88pm860x_bl.c
index 20d96a5ac384..162c83ab0f5a 100644
--- a/drivers/video/backlight/88pm860x_bl.c
+++ b/drivers/video/backlight/88pm860x_bl.c
@@ -123,13 +123,7 @@ static int pm860x_backlight_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.state & BL_CORE_SUSPENDED)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return pm860x_backlight_set(bl, brightness);
diff --git a/drivers/video/backlight/adp5520_bl.c b/drivers/video/backlight/adp5520_bl.c
index 0f63f76723a5..d817b0d95c9d 100644
--- a/drivers/video/backlight/adp5520_bl.c
+++ b/drivers/video/backlight/adp5520_bl.c
@@ -67,10 +67,7 @@ static int adp5520_bl_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return adp5520_bl_set(bl, brightness);
diff --git a/drivers/video/backlight/adp8860_bl.c b/drivers/video/backlight/adp8860_bl.c
index 19968104fc47..a0ce2a3701fa 100644
--- a/drivers/video/backlight/adp8860_bl.c
+++ b/drivers/video/backlight/adp8860_bl.c
@@ -363,10 +363,7 @@ static int adp8860_bl_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return adp8860_bl_set(bl, brightness);
diff --git a/drivers/video/backlight/adp8870_bl.c b/drivers/video/backlight/adp8870_bl.c
index 4c0032010cfe..ae4269fdb189 100644
--- a/drivers/video/backlight/adp8870_bl.c
+++ b/drivers/video/backlight/adp8870_bl.c
@@ -401,10 +401,7 @@ static int adp8870_bl_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return adp8870_bl_set(bl, brightness);
diff --git a/drivers/video/backlight/bd6107.c b/drivers/video/backlight/bd6107.c
index d5d5fb457e78..f6a5c1dba3bc 100644
--- a/drivers/video/backlight/bd6107.c
+++ b/drivers/video/backlight/bd6107.c
@@ -84,9 +84,7 @@ static int bd6107_backlight_update_status(struct backlight_device *backlight)
 	struct bd6107 *bd = bl_get_data(backlight);
 	int brightness = backlight->props.brightness;
 
-	if (backlight->props.power != FB_BLANK_UNBLANK ||
-	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
-	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+	if (backlight_is_blank(backlight))
 		brightness = 0;
 
 	if (brightness) {
diff --git a/drivers/video/backlight/corgi_lcd.c b/drivers/video/backlight/corgi_lcd.c
index 25ef0cbd7583..c9adf4e26355 100644
--- a/drivers/video/backlight/corgi_lcd.c
+++ b/drivers/video/backlight/corgi_lcd.c
@@ -422,10 +422,7 @@ static int corgi_bl_update_status(struct backlight_device *bd)
 	struct corgi_lcd *lcd = bl_get_data(bd);
 	int intensity = bd->props.brightness;
 
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		intensity = 0;
-
-	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bd))
 		intensity = 0;
 
 	if (corgibl_flags & CORGIBL_SUSPENDED)
diff --git a/drivers/video/backlight/cr_bllcd.c b/drivers/video/backlight/cr_bllcd.c
index 4624b7b7c6a6..d5ab7675f55c 100644
--- a/drivers/video/backlight/cr_bllcd.c
+++ b/drivers/video/backlight/cr_bllcd.c
@@ -59,26 +59,18 @@ struct cr_panel {
 
 static int cr_backlight_set_intensity(struct backlight_device *bd)
 {
-	int intensity = bd->props.brightness;
 	u32 addr = gpio_bar + CRVML_PANEL_PORT;
 	u32 cur = inl(addr);
 
-	if (bd->props.power == FB_BLANK_UNBLANK)
-		intensity = FB_BLANK_UNBLANK;
-	if (bd->props.fb_blank == FB_BLANK_UNBLANK)
-		intensity = FB_BLANK_UNBLANK;
-	if (bd->props.power == FB_BLANK_POWERDOWN)
-		intensity = FB_BLANK_POWERDOWN;
-	if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
-		intensity = FB_BLANK_POWERDOWN;
-
-	if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
-		cur &= ~CRVML_BACKLIGHT_OFF;
-		outl(cur, addr);
-	} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
+	if (backlight_is_blank(bd)) {
+		/* OFF */
 		cur |= CRVML_BACKLIGHT_OFF;
 		outl(cur, addr);
-	} /* anything else, don't bother */
+	} else {
+		/* FULL ON */
+		cur &= ~CRVML_BACKLIGHT_OFF;
+		outl(cur, addr);
+	}
 
 	return 0;
 }
diff --git a/drivers/video/backlight/da903x_bl.c b/drivers/video/backlight/da903x_bl.c
index 62540e4bdedb..ca351badfdcf 100644
--- a/drivers/video/backlight/da903x_bl.c
+++ b/drivers/video/backlight/da903x_bl.c
@@ -79,13 +79,7 @@ static int da903x_backlight_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.state & BL_CORE_SUSPENDED)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return da903x_backlight_set(bl, brightness);
diff --git a/drivers/video/backlight/ep93xx_bl.c b/drivers/video/backlight/ep93xx_bl.c
index 4149e0b2f83c..491185df1411 100644
--- a/drivers/video/backlight/ep93xx_bl.c
+++ b/drivers/video/backlight/ep93xx_bl.c
@@ -38,8 +38,7 @@ static int ep93xxbl_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return ep93xxbl_set(bl, brightness);
diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
index 75409ddfba3e..94b65e4d2aa0 100644
--- a/drivers/video/backlight/gpio_backlight.c
+++ b/drivers/video/backlight/gpio_backlight.c
@@ -25,9 +25,7 @@ static int gpio_backlight_get_next_brightness(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return brightness;
diff --git a/drivers/video/backlight/hp680_bl.c b/drivers/video/backlight/hp680_bl.c
index 8ea42b8d9bc8..01d805ca8415 100644
--- a/drivers/video/backlight/hp680_bl.c
+++ b/drivers/video/backlight/hp680_bl.c
@@ -35,9 +35,7 @@ static void hp680bl_send_intensity(struct backlight_device *bd)
 	u16 v;
 	int intensity = bd->props.brightness;
 
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		intensity = 0;
-	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bd))
 		intensity = 0;
 	if (hp680bl_suspended)
 		intensity = 0;
diff --git a/drivers/video/backlight/jornada720_bl.c b/drivers/video/backlight/jornada720_bl.c
index f0385f9cf9da..996f7ba3b373 100644
--- a/drivers/video/backlight/jornada720_bl.c
+++ b/drivers/video/backlight/jornada720_bl.c
@@ -54,7 +54,7 @@ static int jornada_bl_update_status(struct backlight_device *bd)
 	jornada_ssp_start();
 
 	/* If backlight is off then really turn it off */
-	if ((bd->props.power != FB_BLANK_UNBLANK) || (bd->props.fb_blank != FB_BLANK_UNBLANK)) {
+	if (backlight_is_blank(bd)) {
 		ret = jornada_ssp_byte(BRIGHTNESSOFF);
 		if (ret != TXDUMMY) {
 			dev_info(&bd->dev, "brightness off timeout\n");
diff --git a/drivers/video/backlight/kb3886_bl.c b/drivers/video/backlight/kb3886_bl.c
index 1dfe13c18925..a0fd5d3d82f5 100644
--- a/drivers/video/backlight/kb3886_bl.c
+++ b/drivers/video/backlight/kb3886_bl.c
@@ -89,9 +89,7 @@ static int kb3886bl_send_intensity(struct backlight_device *bd)
 {
 	int intensity = bd->props.brightness;
 
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		intensity = 0;
-	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bd))
 		intensity = 0;
 	if (kb3886bl_flags & KB3886BL_SUSPENDED)
 		intensity = 0;
diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c
index 3f66549997c8..c655ddd99cfb 100644
--- a/drivers/video/backlight/led_bl.c
+++ b/drivers/video/backlight/led_bl.c
@@ -56,9 +56,7 @@ static int led_bl_update_status(struct backlight_device *bl)
 	struct led_bl_data *priv = bl_get_data(bl);
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & BL_CORE_FBBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	if (brightness > 0)
diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
index ee09d1bd02b9..476146b62c4e 100644
--- a/drivers/video/backlight/lm3533_bl.c
+++ b/drivers/video/backlight/lm3533_bl.c
@@ -41,9 +41,7 @@ static int lm3533_bl_update_status(struct backlight_device *bd)
 	struct lm3533_bl *bl = bl_get_data(bd);
 	int brightness = bd->props.brightness;
 
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bd))
 		brightness = 0;
 
 	return lm3533_ctrlbank_set_brightness(&bl->cb, (u8)brightness);
diff --git a/drivers/video/backlight/locomolcd.c b/drivers/video/backlight/locomolcd.c
index cdc02e04f89d..8064cad8d683 100644
--- a/drivers/video/backlight/locomolcd.c
+++ b/drivers/video/backlight/locomolcd.c
@@ -113,9 +113,7 @@ static int locomolcd_set_intensity(struct backlight_device *bd)
 {
 	int intensity = bd->props.brightness;
 
-	if (bd->props.power != FB_BLANK_UNBLANK)
-		intensity = 0;
-	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+	if (backlight_is_blank(bd))
 		intensity = 0;
 	if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
 		intensity = 0;
diff --git a/drivers/video/backlight/lv5207lp.c b/drivers/video/backlight/lv5207lp.c
index c6ad73a784e2..ef8aa9803577 100644
--- a/drivers/video/backlight/lv5207lp.c
+++ b/drivers/video/backlight/lv5207lp.c
@@ -48,9 +48,7 @@ static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
 	struct lv5207lp *lv = bl_get_data(backlight);
 	int brightness = backlight->props.brightness;
 
-	if (backlight->props.power != FB_BLANK_UNBLANK ||
-	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
-	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+	if (backlight_is_blank(backlight))
 		brightness = 0;
 
 	if (brightness) {
diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c
index 97cc260ff9d1..b8af2c6407d3 100644
--- a/drivers/video/backlight/max8925_bl.c
+++ b/drivers/video/backlight/max8925_bl.c
@@ -66,13 +66,7 @@ static int max8925_backlight_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.state & BL_CORE_SUSPENDED)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return max8925_backlight_set(bl, brightness);
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 82b8d7594701..7d0ffcd37f07 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -111,9 +111,7 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
 	int brightness = bl->props.brightness;
 	struct pwm_state state;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & BL_CORE_FBBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	if (pb->notify)
diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
index 3d276b30a78c..9600f5d58ece 100644
--- a/drivers/video/backlight/qcom-wled.c
+++ b/drivers/video/backlight/qcom-wled.c
@@ -261,9 +261,7 @@ static int wled_update_status(struct backlight_device *bl)
 	u16 brightness = bl->props.brightness;
 	int rc = 0;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & BL_CORE_FBBLANK)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	mutex_lock(&wled->lock);
diff --git a/drivers/video/backlight/tps65217_bl.c b/drivers/video/backlight/tps65217_bl.c
index 762e3feed097..1041e5e62ee3 100644
--- a/drivers/video/backlight/tps65217_bl.c
+++ b/drivers/video/backlight/tps65217_bl.c
@@ -82,9 +82,7 @@ static int tps65217_bl_update_status(struct backlight_device *bl)
 	if (bl->props.state & BL_CORE_SUSPENDED)
 		brightness = 0;
 
-	if ((bl->props.power != FB_BLANK_UNBLANK) ||
-		(bl->props.fb_blank != FB_BLANK_UNBLANK))
-		/* framebuffer in low power mode or blanking active */
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	if (brightness > 0) {
diff --git a/drivers/video/backlight/wm831x_bl.c b/drivers/video/backlight/wm831x_bl.c
index e55977d54c15..dc2ab6c8b7f9 100644
--- a/drivers/video/backlight/wm831x_bl.c
+++ b/drivers/video/backlight/wm831x_bl.c
@@ -93,13 +93,7 @@ static int wm831x_backlight_update_status(struct backlight_device *bl)
 {
 	int brightness = bl->props.brightness;
 
-	if (bl->props.power != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
-		brightness = 0;
-
-	if (bl->props.state & BL_CORE_SUSPENDED)
+	if (backlight_is_blank(bl))
 		brightness = 0;
 
 	return wm831x_backlight_set(bl, brightness);
-- 
2.25.1

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Re: [PATCH v3 04/13] backlight: improve backlight_properties documentation

[Daniel Thompson]

On Mon, Jun 01, 2020 at 08:51:58AM +0200, Sam Ravnborg wrote:
> Improve the documentation for backlight_properties and
> adapt it to kernel-doc style.
> 
> v2:
>   - Added into for each field (Daniel)
>   - Re-written some parts to explain what to do, rather
>     than what not to do.
>     Partly based on suggestions from the review (Daniel)
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>


> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> ---
>  include/linux/backlight.h | 96 ++++++++++++++++++++++++++++++++++-----
>  1 file changed, 85 insertions(+), 11 deletions(-)
> 
> diff --git a/include/linux/backlight.h b/include/linux/backlight.h
> index b6c1ab6c922a..69a20da03035 100644
> --- a/include/linux/backlight.h
> +++ b/include/linux/backlight.h
> @@ -117,28 +117,102 @@ struct backlight_ops {
>  	int (*check_fb)(struct backlight_device *bd, struct fb_info *info);
>  };
>  
> -/* This structure defines all the properties of a backlight */
> +/**
> + * struct backlight_properties - backlight properties
> + *
> + * This structure defines all the properties of a backlight.
> + */
>  struct backlight_properties {
> -	/* Current User requested brightness (0 - max_brightness) */
> +	/**
> +	 * @brightness: The current brightness requested by the user.
> +	 *
> +	 * The backlight core makes sure the range is (0 to max_brightness)
> +	 * when the brightness is set via the sysfs attribute:
> +	 * /sys/class/backlight/<backlight>/brightness.
> +	 *
> +	 * This value can be set in the backlight_properties passed
> +	 * to devm_backlight_device_register() to set a default brightness
> +	 * value.
> +	 */
>  	int brightness;
> -	/* Maximal value for brightness (read-only) */
> +
> +	/**
> +	 * @max_brightness: The maximum brightness value.
> +	 *
> +	 * This value must be set in the backlight_properties passed to
> +	 * devm_backlight_device_register() and shall not be modified by the
> +	 * driver after registration.
> +	 */
>  	int max_brightness;
> -	/* Current FB Power mode (0: full on, 1..3: power saving
> -	   modes; 4: full off), see FB_BLANK_XXX */
> +
> +	/**
> +	 * @power: The current power mode.
> +	 *
> +	 * User space can configure the power mode using the sysfs
> +	 * attribute: /sys/class/backlight/<backlight>/bl_power
> +	 * When the power property is updated update_status() is called.
> +	 *
> +	 * The possible values are: (0: full on, 1 to 3: power saving
> +	 * modes; 4: full off), see FB_BLANK_XXX.
> +	 *
> +	 * When the backlight device is enabled @power is set
> +	 * to FB_BLANK_UNBLANK. When the backlight device is disabled
> +	 * @power is set to FB_BLANK_POWERDOWN.
> +	 */
>  	int power;
> -	/* FB Blanking active? (values as for power) */
> -	/* Due to be removed, please use (state & BL_CORE_FBBLANK) */
> +
> +	/**
> +	 * @fb_blank: The power state from the FBIOBLANK ioclt.
> +	 *
> +	 * When the FBIOBLANK ioctl is called fb_blank is set to the
> +	 * blank parameter and the update_status() operation is called.
> +	 *
> +	 * When the backlight device is enabled @fb_blank is set
> +	 * to FB_BLANK_UNBLANK. When the backlight device is disabled
> +	 * @fb_blank is set to FB_BLANK_POWERDOWN.
> +	 *
> +	 * Backlight drivers should avoid using this property. It has been
> +	 * replaced by state & BL_CORE_FBLANK (although most drivers should
> +	 * use backlight_is_blank() as the preferred means to get the blank
> +	 * state).
> +	 *
> +	 * fb_blank is deprecated and will be removed.
> +	 */
>  	int fb_blank;
> -	/* Backlight type */
> +
> +	/**
> +	 * @type: The type of backlight supported.
> +	 *
> +	 * The backlight type allows userspace to make appropriate
> +	 * policy desicions based on the backlight type.
> +	 *
> +	 * This value must be set in the backlight_properties
> +	 * passed to devm_backlight_device_register().
> +	 */
>  	enum backlight_type type;
> -	/* Flags used to signal drivers of state changes */
> +
> +	/**
> +	 * @state: The state of the backlight core.
> +	 *
> +	 * The state is a bitmask. BL_CORE_FBBLANK is set when the display
> +	 * is expected to be blank. BL_CORE_SUSPENDED is set when the
> +	 * driver is suspended.
> +	 *
> +	 * backlight drivers are excpected to use backlight_is_blank()
> +	 * in their update_status() operation rather than reading the
> +	 * state property.
> +	 *
> +	 * The state is maintained by the core and drivers may not modify it.
> +	 */
>  	unsigned int state;
> -	/* Type of the brightness scale (linear, non-linear, ...) */
> -	enum backlight_scale scale;
>  
>  #define BL_CORE_SUSPENDED	(1 << 0)	/* backlight is suspended */
>  #define BL_CORE_FBBLANK		(1 << 1)	/* backlight is under an fb blank event */
>  
> +	/**
> +	 * @scale: The type of the brightness scale.
> +	 */
> +	enum backlight_scale scale;
>  };
>  
>  struct backlight_device {
> -- 
> 2.25.1
> 

Re: [PATCH v3 04/13] backlight: improve backlight_properties documentation

[Daniel Thompson]

On Mon, Jun 01, 2020 at 08:51:58AM +0200, Sam Ravnborg wrote:
> Improve the documentation for backlight_properties and
> adapt it to kernel-doc style.
> 
> v2:
>   - Added into for each field (Daniel)
>   - Re-written some parts to explain what to do, rather
>     than what not to do.
>     Partly based on suggestions from the review (Daniel)
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>


> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> ---
>  include/linux/backlight.h | 96 ++++++++++++++++++++++++++++++++++-----
>  1 file changed, 85 insertions(+), 11 deletions(-)
> 
> diff --git a/include/linux/backlight.h b/include/linux/backlight.h
> index b6c1ab6c922a..69a20da03035 100644
> --- a/include/linux/backlight.h
> +++ b/include/linux/backlight.h
> @@ -117,28 +117,102 @@ struct backlight_ops {
>  	int (*check_fb)(struct backlight_device *bd, struct fb_info *info);
>  };
>  
> -/* This structure defines all the properties of a backlight */
> +/**
> + * struct backlight_properties - backlight properties
> + *
> + * This structure defines all the properties of a backlight.
> + */
>  struct backlight_properties {
> -	/* Current User requested brightness (0 - max_brightness) */
> +	/**
> +	 * @brightness: The current brightness requested by the user.
> +	 *
> +	 * The backlight core makes sure the range is (0 to max_brightness)
> +	 * when the brightness is set via the sysfs attribute:
> +	 * /sys/class/backlight/<backlight>/brightness.
> +	 *
> +	 * This value can be set in the backlight_properties passed
> +	 * to devm_backlight_device_register() to set a default brightness
> +	 * value.
> +	 */
>  	int brightness;
> -	/* Maximal value for brightness (read-only) */
> +
> +	/**
> +	 * @max_brightness: The maximum brightness value.
> +	 *
> +	 * This value must be set in the backlight_properties passed to
> +	 * devm_backlight_device_register() and shall not be modified by the
> +	 * driver after registration.
> +	 */
>  	int max_brightness;
> -	/* Current FB Power mode (0: full on, 1..3: power saving
> -	   modes; 4: full off), see FB_BLANK_XXX */
> +
> +	/**
> +	 * @power: The current power mode.
> +	 *
> +	 * User space can configure the power mode using the sysfs
> +	 * attribute: /sys/class/backlight/<backlight>/bl_power
> +	 * When the power property is updated update_status() is called.
> +	 *
> +	 * The possible values are: (0: full on, 1 to 3: power saving
> +	 * modes; 4: full off), see FB_BLANK_XXX.
> +	 *
> +	 * When the backlight device is enabled @power is set
> +	 * to FB_BLANK_UNBLANK. When the backlight device is disabled
> +	 * @power is set to FB_BLANK_POWERDOWN.
> +	 */
>  	int power;
> -	/* FB Blanking active? (values as for power) */
> -	/* Due to be removed, please use (state & BL_CORE_FBBLANK) */
> +
> +	/**
> +	 * @fb_blank: The power state from the FBIOBLANK ioclt.
> +	 *
> +	 * When the FBIOBLANK ioctl is called fb_blank is set to the
> +	 * blank parameter and the update_status() operation is called.
> +	 *
> +	 * When the backlight device is enabled @fb_blank is set
> +	 * to FB_BLANK_UNBLANK. When the backlight device is disabled
> +	 * @fb_blank is set to FB_BLANK_POWERDOWN.
> +	 *
> +	 * Backlight drivers should avoid using this property. It has been
> +	 * replaced by state & BL_CORE_FBLANK (although most drivers should
> +	 * use backlight_is_blank() as the preferred means to get the blank
> +	 * state).
> +	 *
> +	 * fb_blank is deprecated and will be removed.
> +	 */
>  	int fb_blank;
> -	/* Backlight type */
> +
> +	/**
> +	 * @type: The type of backlight supported.
> +	 *
> +	 * The backlight type allows userspace to make appropriate
> +	 * policy desicions based on the backlight type.
> +	 *
> +	 * This value must be set in the backlight_properties
> +	 * passed to devm_backlight_device_register().
> +	 */
>  	enum backlight_type type;
> -	/* Flags used to signal drivers of state changes */
> +
> +	/**
> +	 * @state: The state of the backlight core.
> +	 *
> +	 * The state is a bitmask. BL_CORE_FBBLANK is set when the display
> +	 * is expected to be blank. BL_CORE_SUSPENDED is set when the
> +	 * driver is suspended.
> +	 *
> +	 * backlight drivers are excpected to use backlight_is_blank()
> +	 * in their update_status() operation rather than reading the
> +	 * state property.
> +	 *
> +	 * The state is maintained by the core and drivers may not modify it.
> +	 */
>  	unsigned int state;
> -	/* Type of the brightness scale (linear, non-linear, ...) */
> -	enum backlight_scale scale;
>  
>  #define BL_CORE_SUSPENDED	(1 << 0)	/* backlight is suspended */
>  #define BL_CORE_FBBLANK		(1 << 1)	/* backlight is under an fb blank event */
>  
> +	/**
> +	 * @scale: The type of the brightness scale.
> +	 */
> +	enum backlight_scale scale;
>  };
>  
>  struct backlight_device {
> -- 
> 2.25.1
> 

Re: [PATCH v3 04/13] backlight: improve backlight_properties documentation

[Daniel Thompson]

On Mon, Jun 01, 2020 at 08:51:58AM +0200, Sam Ravnborg wrote:
> Improve the documentation for backlight_properties and
> adapt it to kernel-doc style.
> 
> v2:
>   - Added into for each field (Daniel)
>   - Re-written some parts to explain what to do, rather
>     than what not to do.
>     Partly based on suggestions from the review (Daniel)
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>


> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> ---
>  include/linux/backlight.h | 96 ++++++++++++++++++++++++++++++++++-----
>  1 file changed, 85 insertions(+), 11 deletions(-)
> 
> diff --git a/include/linux/backlight.h b/include/linux/backlight.h
> index b6c1ab6c922a..69a20da03035 100644
> --- a/include/linux/backlight.h
> +++ b/include/linux/backlight.h
> @@ -117,28 +117,102 @@ struct backlight_ops {
>  	int (*check_fb)(struct backlight_device *bd, struct fb_info *info);
>  };
>  
> -/* This structure defines all the properties of a backlight */
> +/**
> + * struct backlight_properties - backlight properties
> + *
> + * This structure defines all the properties of a backlight.
> + */
>  struct backlight_properties {
> -	/* Current User requested brightness (0 - max_brightness) */
> +	/**
> +	 * @brightness: The current brightness requested by the user.
> +	 *
> +	 * The backlight core makes sure the range is (0 to max_brightness)
> +	 * when the brightness is set via the sysfs attribute:
> +	 * /sys/class/backlight/<backlight>/brightness.
> +	 *
> +	 * This value can be set in the backlight_properties passed
> +	 * to devm_backlight_device_register() to set a default brightness
> +	 * value.
> +	 */
>  	int brightness;
> -	/* Maximal value for brightness (read-only) */
> +
> +	/**
> +	 * @max_brightness: The maximum brightness value.
> +	 *
> +	 * This value must be set in the backlight_properties passed to
> +	 * devm_backlight_device_register() and shall not be modified by the
> +	 * driver after registration.
> +	 */
>  	int max_brightness;
> -	/* Current FB Power mode (0: full on, 1..3: power saving
> -	   modes; 4: full off), see FB_BLANK_XXX */
> +
> +	/**
> +	 * @power: The current power mode.
> +	 *
> +	 * User space can configure the power mode using the sysfs
> +	 * attribute: /sys/class/backlight/<backlight>/bl_power
> +	 * When the power property is updated update_status() is called.
> +	 *
> +	 * The possible values are: (0: full on, 1 to 3: power saving
> +	 * modes; 4: full off), see FB_BLANK_XXX.
> +	 *
> +	 * When the backlight device is enabled @power is set
> +	 * to FB_BLANK_UNBLANK. When the backlight device is disabled
> +	 * @power is set to FB_BLANK_POWERDOWN.
> +	 */
>  	int power;
> -	/* FB Blanking active? (values as for power) */
> -	/* Due to be removed, please use (state & BL_CORE_FBBLANK) */
> +
> +	/**
> +	 * @fb_blank: The power state from the FBIOBLANK ioclt.
> +	 *
> +	 * When the FBIOBLANK ioctl is called fb_blank is set to the
> +	 * blank parameter and the update_status() operation is called.
> +	 *
> +	 * When the backlight device is enabled @fb_blank is set
> +	 * to FB_BLANK_UNBLANK. When the backlight device is disabled
> +	 * @fb_blank is set to FB_BLANK_POWERDOWN.
> +	 *
> +	 * Backlight drivers should avoid using this property. It has been
> +	 * replaced by state & BL_CORE_FBLANK (although most drivers should
> +	 * use backlight_is_blank() as the preferred means to get the blank
> +	 * state).
> +	 *
> +	 * fb_blank is deprecated and will be removed.
> +	 */
>  	int fb_blank;
> -	/* Backlight type */
> +
> +	/**
> +	 * @type: The type of backlight supported.
> +	 *
> +	 * The backlight type allows userspace to make appropriate
> +	 * policy desicions based on the backlight type.
> +	 *
> +	 * This value must be set in the backlight_properties
> +	 * passed to devm_backlight_device_register().
> +	 */
>  	enum backlight_type type;
> -	/* Flags used to signal drivers of state changes */
> +
> +	/**
> +	 * @state: The state of the backlight core.
> +	 *
> +	 * The state is a bitmask. BL_CORE_FBBLANK is set when the display
> +	 * is expected to be blank. BL_CORE_SUSPENDED is set when the
> +	 * driver is suspended.
> +	 *
> +	 * backlight drivers are excpected to use backlight_is_blank()
> +	 * in their update_status() operation rather than reading the
> +	 * state property.
> +	 *
> +	 * The state is maintained by the core and drivers may not modify it.
> +	 */
>  	unsigned int state;
> -	/* Type of the brightness scale (linear, non-linear, ...) */
> -	enum backlight_scale scale;
>  
>  #define BL_CORE_SUSPENDED	(1 << 0)	/* backlight is suspended */
>  #define BL_CORE_FBBLANK		(1 << 1)	/* backlight is under an fb blank event */
>  
> +	/**
> +	 * @scale: The type of the brightness scale.
> +	 */
> +	enum backlight_scale scale;
>  };
>  
>  struct backlight_device {
> -- 
> 2.25.1
> 
_______________________________________________
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dri-devel@lists.freedesktop.org
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Re: [PATCH v3 05/13] backlight: improve backlight_device documentation

[Daniel Thompson]

On Mon, Jun 01, 2020 at 08:51:59AM +0200, Sam Ravnborg wrote:
> Improve the documentation for backlight_device and
> adapt it to kernel-doc style.
> 
> v2:
>   - Add short intro to all fields (Daniel)
>   - Updated description of update_lock (Daniel)

I like the update... but it doesn't cover what I was commenting on.


> diff --git a/include/linux/backlight.h b/include/linux/backlight.h
> index 69a20da03035..cae1af95dd9d 100644
> --- a/include/linux/backlight.h
> +++ b/include/linux/backlight.h
> @@ -14,21 +14,6 @@
>  #include <linux/mutex.h>
>  #include <linux/notifier.h>
>  
> -/* Notes on locking:
> - *
> - * backlight_device->ops_lock is an internal backlight lock protecting the
> - * ops pointer and no code outside the core should need to touch it.
> - *
> - * Access to update_status() is serialised by the update_lock mutex since
> - * most drivers seem to need this and historically get it wrong.
> - *
> - * Most drivers don't need locking on their get_brightness() method.
> - * If yours does, you need to implement it in the driver. You can use the
> - * update_lock mutex if appropriate.

This explicitly says that drivers are permitted to use update_lock in
their get_brightness() method.


> - *
> - * Any other use of the locks below is probably wrong.
> - */
> -
>  enum backlight_update_reason {
>  	BACKLIGHT_UPDATE_HOTKEY,
>  	BACKLIGHT_UPDATE_SYSFS,
> @@ -215,30 +200,71 @@ struct backlight_properties {
>  	enum backlight_scale scale;
>  };
>  
> +/**
> + * struct backlight_device - backlight device data
> + *
> + * This structure holds all data required by a backlight device.
> + */
>  struct backlight_device {
> -	/* Backlight properties */
> +	/**
> +	 * @props: Backlight properties
> +	 */
>  	struct backlight_properties props;
>  
> -	/* Serialise access to update_status method */
> +	/**
> +	 * @update_lock: The lock used when calling the update_status() operation.
> +	 *
> +	 * update_lock is an internal backlight lock that serialise access
> +	 * to the update_status() operation. The backlight core holds the update_lock
> +	 * when calling the update_status() operation. The update_lock shall not
> +	 * be used by backlight drivers.
> +	 */

This contradicts the original comment about locking.

I'm fairly neutral about the change (AFAICT no driver actually ever
uses update_lock from get_brightness) but if we add new documentation
that flatly contradicts old documentary comments then I'd expect to
see something in the patch description explaining that the change
really is deliberate (and why it is a good change).


Daniel.

Re: [PATCH v3 05/13] backlight: improve backlight_device documentation

[Daniel Thompson]

On Mon, Jun 01, 2020 at 08:51:59AM +0200, Sam Ravnborg wrote:
> Improve the documentation for backlight_device and
> adapt it to kernel-doc style.
> 
> v2:
>   - Add short intro to all fields (Daniel)
>   - Updated description of update_lock (Daniel)

I like the update... but it doesn't cover what I was commenting on.


> diff --git a/include/linux/backlight.h b/include/linux/backlight.h
> index 69a20da03035..cae1af95dd9d 100644
> --- a/include/linux/backlight.h
> +++ b/include/linux/backlight.h
> @@ -14,21 +14,6 @@
>  #include <linux/mutex.h>
>  #include <linux/notifier.h>
>  
> -/* Notes on locking:
> - *
> - * backlight_device->ops_lock is an internal backlight lock protecting the
> - * ops pointer and no code outside the core should need to touch it.
> - *
> - * Access to update_status() is serialised by the update_lock mutex since
> - * most drivers seem to need this and historically get it wrong.
> - *
> - * Most drivers don't need locking on their get_brightness() method.
> - * If yours does, you need to implement it in the driver. You can use the
> - * update_lock mutex if appropriate.

This explicitly says that drivers are permitted to use update_lock in
their get_brightness() method.


> - *
> - * Any other use of the locks below is probably wrong.
> - */
> -
>  enum backlight_update_reason {
>  	BACKLIGHT_UPDATE_HOTKEY,
>  	BACKLIGHT_UPDATE_SYSFS,
> @@ -215,30 +200,71 @@ struct backlight_properties {
>  	enum backlight_scale scale;
>  };
>  
> +/**
> + * struct backlight_device - backlight device data
> + *
> + * This structure holds all data required by a backlight device.
> + */
>  struct backlight_device {
> -	/* Backlight properties */
> +	/**
> +	 * @props: Backlight properties
> +	 */
>  	struct backlight_properties props;
>  
> -	/* Serialise access to update_status method */
> +	/**
> +	 * @update_lock: The lock used when calling the update_status() operation.
> +	 *
> +	 * update_lock is an internal backlight lock that serialise access
> +	 * to the update_status() operation. The backlight core holds the update_lock
> +	 * when calling the update_status() operation. The update_lock shall not
> +	 * be used by backlight drivers.
> +	 */

This contradicts the original comment about locking.

I'm fairly neutral about the change (AFAICT no driver actually ever
uses update_lock from get_brightness) but if we add new documentation
that flatly contradicts old documentary comments then I'd expect to
see something in the patch description explaining that the change
really is deliberate (and why it is a good change).


Daniel.

Re: [PATCH v3 05/13] backlight: improve backlight_device documentation

[Daniel Thompson]

On Mon, Jun 01, 2020 at 08:51:59AM +0200, Sam Ravnborg wrote:
> Improve the documentation for backlight_device and
> adapt it to kernel-doc style.
> 
> v2:
>   - Add short intro to all fields (Daniel)
>   - Updated description of update_lock (Daniel)

I like the update... but it doesn't cover what I was commenting on.


> diff --git a/include/linux/backlight.h b/include/linux/backlight.h
> index 69a20da03035..cae1af95dd9d 100644
> --- a/include/linux/backlight.h
> +++ b/include/linux/backlight.h
> @@ -14,21 +14,6 @@
>  #include <linux/mutex.h>
>  #include <linux/notifier.h>
>  
> -/* Notes on locking:
> - *
> - * backlight_device->ops_lock is an internal backlight lock protecting the
> - * ops pointer and no code outside the core should need to touch it.
> - *
> - * Access to update_status() is serialised by the update_lock mutex since
> - * most drivers seem to need this and historically get it wrong.
> - *
> - * Most drivers don't need locking on their get_brightness() method.
> - * If yours does, you need to implement it in the driver. You can use the
> - * update_lock mutex if appropriate.

This explicitly says that drivers are permitted to use update_lock in
their get_brightness() method.


> - *
> - * Any other use of the locks below is probably wrong.
> - */
> -
>  enum backlight_update_reason {
>  	BACKLIGHT_UPDATE_HOTKEY,
>  	BACKLIGHT_UPDATE_SYSFS,
> @@ -215,30 +200,71 @@ struct backlight_properties {
>  	enum backlight_scale scale;
>  };
>  
> +/**
> + * struct backlight_device - backlight device data
> + *
> + * This structure holds all data required by a backlight device.
> + */
>  struct backlight_device {
> -	/* Backlight properties */
> +	/**
> +	 * @props: Backlight properties
> +	 */
>  	struct backlight_properties props;
>  
> -	/* Serialise access to update_status method */
> +	/**
> +	 * @update_lock: The lock used when calling the update_status() operation.
> +	 *
> +	 * update_lock is an internal backlight lock that serialise access
> +	 * to the update_status() operation. The backlight core holds the update_lock
> +	 * when calling the update_status() operation. The update_lock shall not
> +	 * be used by backlight drivers.
> +	 */

This contradicts the original comment about locking.

I'm fairly neutral about the change (AFAICT no driver actually ever
uses update_lock from get_brightness) but if we add new documentation
that flatly contradicts old documentary comments then I'd expect to
see something in the patch description explaining that the change
really is deliberate (and why it is a good change).


Daniel.
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
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Re: [PATCH v3 10/13] backlight: add overview and update existing doc

[Daniel Thompson]

On Mon, Jun 01, 2020 at 08:52:04AM +0200, Sam Ravnborg wrote:
> Add overview chapter to backlight.c.
> Update existing kernel-doc to follow a more consistent
> style and drop kernel-doc for deprecated functions.
> 
> v2:
>   - Sevaral editorial corrections that makes reading
>     much easier (Daniel)
>   - Spelling fixes (Daniel)
>   - updated intro chapter with a little more info
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Two very small nits... but one will affect formatted output so I had to
raise it. Feel free add my Reviewed-by: when recirculating!


Daniel.


> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> ---
>  drivers/video/backlight/backlight.c | 131 +++++++++++++++++++---------
>  1 file changed, 90 insertions(+), 41 deletions(-)
> 
> diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
> index 17f04cff50ab..06bcddd76a7e 100644
> --- a/drivers/video/backlight/backlight.c
> +++ b/drivers/video/backlight/backlight.c
> @@ -22,6 +22,46 @@
>  #include <asm/backlight.h>
>  #endif
>  
> +/**
> + * DOC: overview
> + *
> + * The backlight core supports implementing backlight drivers.
> + *
> + * A backlight driver registers a driver using
> + * devm_backlight_device_register(). The properties of the backlight
> + * driver such as type and max_brightness must be specified.
> + * When the core detect changes in for example brightness or power state
> + * the update_status() operation is called. The backlight driver shall
> + * implement this operation and use it to adjust backlight.
> + *
> + * Several sysfs attributes are provided by the backlight core::
> + *
> + * - brightness         R/W, set the requested brightness level
> + * - actual_brighness   RO, the brightness level used by the HW
> + * - max_brightness     RO, the maximum  brightness level supported
> + *
> + * See Documentation/ABI/stable/sysfs-class-backlight for the full list.
> + *
> + * The backlight can be adjusted using the sysfs interface, and
> + * the backlight driver may also support adjusting backlight using
> + * a hot-key or some other platfrom or firmware specific way.
> + *
> + * The driver shall implement the get_brightness() operation if

I overlooked this before but this reads better with "must" rather
than "shall". It's not wrong to use shall but I think it is more
idiomatic to use "must".


> + * the HW do not support all the levels that can be specified in
> + * brightness, thus providing user-space access to the actual level
> + * via the actual_brightness attribute.
> + * When the backlight changes this is reported to user-space using

Missing newline between paragraphs...


> + * an uevent connected to the actual_brightness attribute.
> + * When brightness is set by platform specific means, for example
> + * a hot-key to adjust backlight, the driver must notify the backlight
> + * core that brightness has changed using backlight_force_update().
> + *
> + * The backlight driver core receives notifications from fbdev and
> + * if the event is FB_EVENT_BLANK and if the value of blank, from the
> + * FBIOBLANK ioclt, results in a change in the backlight state the
> + * update_status() operation is called.
> + */
> +
>  static struct list_head backlight_dev_list;
>  static struct mutex backlight_dev_list_mutex;
>  static struct blocking_notifier_head backlight_notifier;
> @@ -40,9 +80,17 @@ static const char *const backlight_scale_types[] = {
>  
>  #if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \
>  			   defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE))
> -/* This callback gets called when something important happens inside a
> - * framebuffer driver. We're looking if that important event is blanking,
> - * and if it is and necessary, we're switching backlight power as well ...
> +/*
> + * fb_notifier_callback
> + *
> + * This callback gets called when something important happens inside a
> + * framebuffer driver. The backlight core only cares about FB_BLANK_UNBLANK
> + * which is reported to the driver using backlight_update_status()
> + * as a state change.
> + *
> + * There may be several fbdev's connected to the backlight device,
> + * in which case they are kept track of. A state change is only reported
> + * if there is a change in backlight for the specified fbdev.
>   */
>  static int fb_notifier_callback(struct notifier_block *self,
>  				unsigned long event, void *data)
> @@ -318,12 +366,15 @@ static struct attribute *bl_device_attrs[] = {
>  ATTRIBUTE_GROUPS(bl_device);
>  
>  /**
> - * backlight_force_update - tell the backlight subsystem that hardware state
> - *   has changed
> + * backlight_force_update - force an update due to a hardware change
>   * @bd: the backlight device to update
> + * @reason: the method used for the backlight update
>   *
>   * Updates the internal state of the backlight in response to a hardware event,
> - * and generate a uevent to notify userspace
> + * and generates an uevent to notify userspace. A backlight driver shall call
> + * backlight_force_update() when the backlight is changed using, for example,
> + * a hot-key. The updated brightness is read using get_brightness() and the
> + * brightness value is reported using an uevent.
>   */
>  void backlight_force_update(struct backlight_device *bd,
>  			    enum backlight_update_reason reason)
> @@ -336,19 +387,7 @@ void backlight_force_update(struct backlight_device *bd,
>  }
>  EXPORT_SYMBOL(backlight_force_update);
>  
> -/**
> - * backlight_device_register - create and register a new object of
> - *   backlight_device class.
> - * @name: the name of the new object(must be the same as the name of the
> - *   respective framebuffer device).
> - * @parent: a pointer to the parent device
> - * @devdata: an optional pointer to be stored for private driver use. The
> - *   methods may retrieve it by using bl_get_data(bd).
> - * @ops: the backlight operations structure.
> - *
> - * Creates and registers new backlight device. Returns either an
> - * ERR_PTR() or a pointer to the newly allocated device.
> - */
> +/* deprecated - use devm_backlight_device_register() */
>  struct backlight_device *backlight_device_register(const char *name,
>  	struct device *parent, void *devdata, const struct backlight_ops *ops,
>  	const struct backlight_properties *props)
> @@ -415,6 +454,15 @@ struct backlight_device *backlight_device_register(const char *name,
>  }
>  EXPORT_SYMBOL(backlight_device_register);
>  
> +/** backlight_device_get_by_type - find first backlight device of a type
> + * @type: the type of backlight device
> + *
> + * Look up the first backlight device of the specified type
> + *
> + * RETURNS:
> + *
> + * Pointer to backlight device if any was found. Otherwise NULL.
> + */
>  struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
>  {
>  	bool found = false;
> @@ -433,12 +481,7 @@ struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
>  }
>  EXPORT_SYMBOL(backlight_device_get_by_type);
>  
> -/**
> - * backlight_device_unregister - unregisters a backlight device object.
> - * @bd: the backlight device object to be unregistered and freed.
> - *
> - * Unregisters a previously registered via backlight_device_register object.
> - */
> +/* deprecated - use devm_backlight_device_unregister() */
>  void backlight_device_unregister(struct backlight_device *bd)
>  {
>  	if (!bd)
> @@ -486,10 +529,12 @@ static int devm_backlight_device_match(struct device *dev, void *res,
>   * backlight_register_notifier - get notified of backlight (un)registration
>   * @nb: notifier block with the notifier to call on backlight (un)registration
>   *
> - * @return 0 on success, otherwise a negative error code
> - *
>   * Register a notifier to get notified when backlight devices get registered
>   * or unregistered.
> + *
> + * RETURNS:
> + *
> + * 0 on success, otherwise a negative error code
>   */
>  int backlight_register_notifier(struct notifier_block *nb)
>  {
> @@ -501,10 +546,12 @@ EXPORT_SYMBOL(backlight_register_notifier);
>   * backlight_unregister_notifier - unregister a backlight notifier
>   * @nb: notifier block to unregister
>   *
> - * @return 0 on success, otherwise a negative error code
> - *
>   * Register a notifier to get notified when backlight devices get registered
>   * or unregistered.
> + *
> + * RETURNS:
> + *
> + * 0 on success, otherwise a negative error code
>   */
>  int backlight_unregister_notifier(struct notifier_block *nb)
>  {
> @@ -513,20 +560,22 @@ int backlight_unregister_notifier(struct notifier_block *nb)
>  EXPORT_SYMBOL(backlight_unregister_notifier);
>  
>  /**
> - * devm_backlight_device_register - resource managed backlight_device_register()
> + * devm_backlight_device_register - register a new backlight device
>   * @dev: the device to register
>   * @name: the name of the device
> - * @parent: a pointer to the parent device
> + * @parent: a pointer to the parent device (often the same as @dev)
>   * @devdata: an optional pointer to be stored for private driver use
>   * @ops: the backlight operations structure
>   * @props: the backlight properties
>   *
> - * @return a struct backlight on success, or an ERR_PTR on error
> + * Creates and registers new backlight device. When a backlight device
> + * is registered the configuration must be specified in the @props
> + * parameter. See description of &backlight_properties.
>   *
> - * Managed backlight_device_register(). The backlight_device returned
> - * from this function are automatically freed on driver detach.
> - * See backlight_device_register() for more information.
> - */
> + * RETURNS:
> + *
> + * struct backlight on success, or an ERR_PTR on error
> +*/
>  struct backlight_device *devm_backlight_device_register(struct device *dev,
>  	const char *name, struct device *parent, void *devdata,
>  	const struct backlight_ops *ops,
> @@ -553,13 +602,13 @@ struct backlight_device *devm_backlight_device_register(struct device *dev,
>  EXPORT_SYMBOL(devm_backlight_device_register);
>  
>  /**
> - * devm_backlight_device_unregister - resource managed backlight_device_unregister()
> + * devm_backlight_device_unregister - unregister backlight device
>   * @dev: the device to unregister
>   * @bd: the backlight device to unregister
>   *
> - * Deallocated a backlight allocated with devm_backlight_device_register().
> + * Deallocates a backlight allocated with devm_backlight_device_register().
>   * Normally this function will not need to be called and the resource management
> - * code will ensure that the resource is freed.
> + * code will ensure that the resources are freed.
>   */
>  void devm_backlight_device_unregister(struct device *dev,
>  				struct backlight_device *bd)
> @@ -650,8 +699,8 @@ static void devm_backlight_release(void *data)
>  }
>  
>  /**
> - * devm_of_find_backlight - Resource-managed of_find_backlight()
> - * @dev: Device
> + * devm_of_find_backlight - find backlight for a device
> + * @dev: the device
>   *
>   * Device managed version of of_find_backlight().
>   * The reference on the backlight device is automatically
> -- 
> 2.25.1
> 

Re: [PATCH v3 10/13] backlight: add overview and update existing doc

[Daniel Thompson]

On Mon, Jun 01, 2020 at 08:52:04AM +0200, Sam Ravnborg wrote:
> Add overview chapter to backlight.c.
> Update existing kernel-doc to follow a more consistent
> style and drop kernel-doc for deprecated functions.
> 
> v2:
>   - Sevaral editorial corrections that makes reading
>     much easier (Daniel)
>   - Spelling fixes (Daniel)
>   - updated intro chapter with a little more info
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Two very small nits... but one will affect formatted output so I had to
raise it. Feel free add my Reviewed-by: when recirculating!


Daniel.


> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> ---
>  drivers/video/backlight/backlight.c | 131 +++++++++++++++++++---------
>  1 file changed, 90 insertions(+), 41 deletions(-)
> 
> diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
> index 17f04cff50ab..06bcddd76a7e 100644
> --- a/drivers/video/backlight/backlight.c
> +++ b/drivers/video/backlight/backlight.c
> @@ -22,6 +22,46 @@
>  #include <asm/backlight.h>
>  #endif
>  
> +/**
> + * DOC: overview
> + *
> + * The backlight core supports implementing backlight drivers.
> + *
> + * A backlight driver registers a driver using
> + * devm_backlight_device_register(). The properties of the backlight
> + * driver such as type and max_brightness must be specified.
> + * When the core detect changes in for example brightness or power state
> + * the update_status() operation is called. The backlight driver shall
> + * implement this operation and use it to adjust backlight.
> + *
> + * Several sysfs attributes are provided by the backlight core::
> + *
> + * - brightness         R/W, set the requested brightness level
> + * - actual_brighness   RO, the brightness level used by the HW
> + * - max_brightness     RO, the maximum  brightness level supported
> + *
> + * See Documentation/ABI/stable/sysfs-class-backlight for the full list.
> + *
> + * The backlight can be adjusted using the sysfs interface, and
> + * the backlight driver may also support adjusting backlight using
> + * a hot-key or some other platfrom or firmware specific way.
> + *
> + * The driver shall implement the get_brightness() operation if

I overlooked this before but this reads better with "must" rather
than "shall". It's not wrong to use shall but I think it is more
idiomatic to use "must".


> + * the HW do not support all the levels that can be specified in
> + * brightness, thus providing user-space access to the actual level
> + * via the actual_brightness attribute.
> + * When the backlight changes this is reported to user-space using

Missing newline between paragraphs...


> + * an uevent connected to the actual_brightness attribute.
> + * When brightness is set by platform specific means, for example
> + * a hot-key to adjust backlight, the driver must notify the backlight
> + * core that brightness has changed using backlight_force_update().
> + *
> + * The backlight driver core receives notifications from fbdev and
> + * if the event is FB_EVENT_BLANK and if the value of blank, from the
> + * FBIOBLANK ioclt, results in a change in the backlight state the
> + * update_status() operation is called.
> + */
> +
>  static struct list_head backlight_dev_list;
>  static struct mutex backlight_dev_list_mutex;
>  static struct blocking_notifier_head backlight_notifier;
> @@ -40,9 +80,17 @@ static const char *const backlight_scale_types[] = {
>  
>  #if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \
>  			   defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE))
> -/* This callback gets called when something important happens inside a
> - * framebuffer driver. We're looking if that important event is blanking,
> - * and if it is and necessary, we're switching backlight power as well ...
> +/*
> + * fb_notifier_callback
> + *
> + * This callback gets called when something important happens inside a
> + * framebuffer driver. The backlight core only cares about FB_BLANK_UNBLANK
> + * which is reported to the driver using backlight_update_status()
> + * as a state change.
> + *
> + * There may be several fbdev's connected to the backlight device,
> + * in which case they are kept track of. A state change is only reported
> + * if there is a change in backlight for the specified fbdev.
>   */
>  static int fb_notifier_callback(struct notifier_block *self,
>  				unsigned long event, void *data)
> @@ -318,12 +366,15 @@ static struct attribute *bl_device_attrs[] = {
>  ATTRIBUTE_GROUPS(bl_device);
>  
>  /**
> - * backlight_force_update - tell the backlight subsystem that hardware state
> - *   has changed
> + * backlight_force_update - force an update due to a hardware change
>   * @bd: the backlight device to update
> + * @reason: the method used for the backlight update
>   *
>   * Updates the internal state of the backlight in response to a hardware event,
> - * and generate a uevent to notify userspace
> + * and generates an uevent to notify userspace. A backlight driver shall call
> + * backlight_force_update() when the backlight is changed using, for example,
> + * a hot-key. The updated brightness is read using get_brightness() and the
> + * brightness value is reported using an uevent.
>   */
>  void backlight_force_update(struct backlight_device *bd,
>  			    enum backlight_update_reason reason)
> @@ -336,19 +387,7 @@ void backlight_force_update(struct backlight_device *bd,
>  }
>  EXPORT_SYMBOL(backlight_force_update);
>  
> -/**
> - * backlight_device_register - create and register a new object of
> - *   backlight_device class.
> - * @name: the name of the new object(must be the same as the name of the
> - *   respective framebuffer device).
> - * @parent: a pointer to the parent device
> - * @devdata: an optional pointer to be stored for private driver use. The
> - *   methods may retrieve it by using bl_get_data(bd).
> - * @ops: the backlight operations structure.
> - *
> - * Creates and registers new backlight device. Returns either an
> - * ERR_PTR() or a pointer to the newly allocated device.
> - */
> +/* deprecated - use devm_backlight_device_register() */
>  struct backlight_device *backlight_device_register(const char *name,
>  	struct device *parent, void *devdata, const struct backlight_ops *ops,
>  	const struct backlight_properties *props)
> @@ -415,6 +454,15 @@ struct backlight_device *backlight_device_register(const char *name,
>  }
>  EXPORT_SYMBOL(backlight_device_register);
>  
> +/** backlight_device_get_by_type - find first backlight device of a type
> + * @type: the type of backlight device
> + *
> + * Look up the first backlight device of the specified type
> + *
> + * RETURNS:
> + *
> + * Pointer to backlight device if any was found. Otherwise NULL.
> + */
>  struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
>  {
>  	bool found = false;
> @@ -433,12 +481,7 @@ struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
>  }
>  EXPORT_SYMBOL(backlight_device_get_by_type);
>  
> -/**
> - * backlight_device_unregister - unregisters a backlight device object.
> - * @bd: the backlight device object to be unregistered and freed.
> - *
> - * Unregisters a previously registered via backlight_device_register object.
> - */
> +/* deprecated - use devm_backlight_device_unregister() */
>  void backlight_device_unregister(struct backlight_device *bd)
>  {
>  	if (!bd)
> @@ -486,10 +529,12 @@ static int devm_backlight_device_match(struct device *dev, void *res,
>   * backlight_register_notifier - get notified of backlight (un)registration
>   * @nb: notifier block with the notifier to call on backlight (un)registration
>   *
> - * @return 0 on success, otherwise a negative error code
> - *
>   * Register a notifier to get notified when backlight devices get registered
>   * or unregistered.
> + *
> + * RETURNS:
> + *
> + * 0 on success, otherwise a negative error code
>   */
>  int backlight_register_notifier(struct notifier_block *nb)
>  {
> @@ -501,10 +546,12 @@ EXPORT_SYMBOL(backlight_register_notifier);
>   * backlight_unregister_notifier - unregister a backlight notifier
>   * @nb: notifier block to unregister
>   *
> - * @return 0 on success, otherwise a negative error code
> - *
>   * Register a notifier to get notified when backlight devices get registered
>   * or unregistered.
> + *
> + * RETURNS:
> + *
> + * 0 on success, otherwise a negative error code
>   */
>  int backlight_unregister_notifier(struct notifier_block *nb)
>  {
> @@ -513,20 +560,22 @@ int backlight_unregister_notifier(struct notifier_block *nb)
>  EXPORT_SYMBOL(backlight_unregister_notifier);
>  
>  /**
> - * devm_backlight_device_register - resource managed backlight_device_register()
> + * devm_backlight_device_register - register a new backlight device
>   * @dev: the device to register
>   * @name: the name of the device
> - * @parent: a pointer to the parent device
> + * @parent: a pointer to the parent device (often the same as @dev)
>   * @devdata: an optional pointer to be stored for private driver use
>   * @ops: the backlight operations structure
>   * @props: the backlight properties
>   *
> - * @return a struct backlight on success, or an ERR_PTR on error
> + * Creates and registers new backlight device. When a backlight device
> + * is registered the configuration must be specified in the @props
> + * parameter. See description of &backlight_properties.
>   *
> - * Managed backlight_device_register(). The backlight_device returned
> - * from this function are automatically freed on driver detach.
> - * See backlight_device_register() for more information.
> - */
> + * RETURNS:
> + *
> + * struct backlight on success, or an ERR_PTR on error
> +*/
>  struct backlight_device *devm_backlight_device_register(struct device *dev,
>  	const char *name, struct device *parent, void *devdata,
>  	const struct backlight_ops *ops,
> @@ -553,13 +602,13 @@ struct backlight_device *devm_backlight_device_register(struct device *dev,
>  EXPORT_SYMBOL(devm_backlight_device_register);
>  
>  /**
> - * devm_backlight_device_unregister - resource managed backlight_device_unregister()
> + * devm_backlight_device_unregister - unregister backlight device
>   * @dev: the device to unregister
>   * @bd: the backlight device to unregister
>   *
> - * Deallocated a backlight allocated with devm_backlight_device_register().
> + * Deallocates a backlight allocated with devm_backlight_device_register().
>   * Normally this function will not need to be called and the resource management
> - * code will ensure that the resource is freed.
> + * code will ensure that the resources are freed.
>   */
>  void devm_backlight_device_unregister(struct device *dev,
>  				struct backlight_device *bd)
> @@ -650,8 +699,8 @@ static void devm_backlight_release(void *data)
>  }
>  
>  /**
> - * devm_of_find_backlight - Resource-managed of_find_backlight()
> - * @dev: Device
> + * devm_of_find_backlight - find backlight for a device
> + * @dev: the device
>   *
>   * Device managed version of of_find_backlight().
>   * The reference on the backlight device is automatically
> -- 
> 2.25.1
> 

Re: [PATCH v3 10/13] backlight: add overview and update existing doc

[Daniel Thompson]

On Mon, Jun 01, 2020 at 08:52:04AM +0200, Sam Ravnborg wrote:
> Add overview chapter to backlight.c.
> Update existing kernel-doc to follow a more consistent
> style and drop kernel-doc for deprecated functions.
> 
> v2:
>   - Sevaral editorial corrections that makes reading
>     much easier (Daniel)
>   - Spelling fixes (Daniel)
>   - updated intro chapter with a little more info
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Two very small nits... but one will affect formatted output so I had to
raise it. Feel free add my Reviewed-by: when recirculating!


Daniel.


> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> ---
>  drivers/video/backlight/backlight.c | 131 +++++++++++++++++++---------
>  1 file changed, 90 insertions(+), 41 deletions(-)
> 
> diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
> index 17f04cff50ab..06bcddd76a7e 100644
> --- a/drivers/video/backlight/backlight.c
> +++ b/drivers/video/backlight/backlight.c
> @@ -22,6 +22,46 @@
>  #include <asm/backlight.h>
>  #endif
>  
> +/**
> + * DOC: overview
> + *
> + * The backlight core supports implementing backlight drivers.
> + *
> + * A backlight driver registers a driver using
> + * devm_backlight_device_register(). The properties of the backlight
> + * driver such as type and max_brightness must be specified.
> + * When the core detect changes in for example brightness or power state
> + * the update_status() operation is called. The backlight driver shall
> + * implement this operation and use it to adjust backlight.
> + *
> + * Several sysfs attributes are provided by the backlight core::
> + *
> + * - brightness         R/W, set the requested brightness level
> + * - actual_brighness   RO, the brightness level used by the HW
> + * - max_brightness     RO, the maximum  brightness level supported
> + *
> + * See Documentation/ABI/stable/sysfs-class-backlight for the full list.
> + *
> + * The backlight can be adjusted using the sysfs interface, and
> + * the backlight driver may also support adjusting backlight using
> + * a hot-key or some other platfrom or firmware specific way.
> + *
> + * The driver shall implement the get_brightness() operation if

I overlooked this before but this reads better with "must" rather
than "shall". It's not wrong to use shall but I think it is more
idiomatic to use "must".


> + * the HW do not support all the levels that can be specified in
> + * brightness, thus providing user-space access to the actual level
> + * via the actual_brightness attribute.
> + * When the backlight changes this is reported to user-space using

Missing newline between paragraphs...


> + * an uevent connected to the actual_brightness attribute.
> + * When brightness is set by platform specific means, for example
> + * a hot-key to adjust backlight, the driver must notify the backlight
> + * core that brightness has changed using backlight_force_update().
> + *
> + * The backlight driver core receives notifications from fbdev and
> + * if the event is FB_EVENT_BLANK and if the value of blank, from the
> + * FBIOBLANK ioclt, results in a change in the backlight state the
> + * update_status() operation is called.
> + */
> +
>  static struct list_head backlight_dev_list;
>  static struct mutex backlight_dev_list_mutex;
>  static struct blocking_notifier_head backlight_notifier;
> @@ -40,9 +80,17 @@ static const char *const backlight_scale_types[] = {
>  
>  #if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \
>  			   defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE))
> -/* This callback gets called when something important happens inside a
> - * framebuffer driver. We're looking if that important event is blanking,
> - * and if it is and necessary, we're switching backlight power as well ...
> +/*
> + * fb_notifier_callback
> + *
> + * This callback gets called when something important happens inside a
> + * framebuffer driver. The backlight core only cares about FB_BLANK_UNBLANK
> + * which is reported to the driver using backlight_update_status()
> + * as a state change.
> + *
> + * There may be several fbdev's connected to the backlight device,
> + * in which case they are kept track of. A state change is only reported
> + * if there is a change in backlight for the specified fbdev.
>   */
>  static int fb_notifier_callback(struct notifier_block *self,
>  				unsigned long event, void *data)
> @@ -318,12 +366,15 @@ static struct attribute *bl_device_attrs[] = {
>  ATTRIBUTE_GROUPS(bl_device);
>  
>  /**
> - * backlight_force_update - tell the backlight subsystem that hardware state
> - *   has changed
> + * backlight_force_update - force an update due to a hardware change
>   * @bd: the backlight device to update
> + * @reason: the method used for the backlight update
>   *
>   * Updates the internal state of the backlight in response to a hardware event,
> - * and generate a uevent to notify userspace
> + * and generates an uevent to notify userspace. A backlight driver shall call
> + * backlight_force_update() when the backlight is changed using, for example,
> + * a hot-key. The updated brightness is read using get_brightness() and the
> + * brightness value is reported using an uevent.
>   */
>  void backlight_force_update(struct backlight_device *bd,
>  			    enum backlight_update_reason reason)
> @@ -336,19 +387,7 @@ void backlight_force_update(struct backlight_device *bd,
>  }
>  EXPORT_SYMBOL(backlight_force_update);
>  
> -/**
> - * backlight_device_register - create and register a new object of
> - *   backlight_device class.
> - * @name: the name of the new object(must be the same as the name of the
> - *   respective framebuffer device).
> - * @parent: a pointer to the parent device
> - * @devdata: an optional pointer to be stored for private driver use. The
> - *   methods may retrieve it by using bl_get_data(bd).
> - * @ops: the backlight operations structure.
> - *
> - * Creates and registers new backlight device. Returns either an
> - * ERR_PTR() or a pointer to the newly allocated device.
> - */
> +/* deprecated - use devm_backlight_device_register() */
>  struct backlight_device *backlight_device_register(const char *name,
>  	struct device *parent, void *devdata, const struct backlight_ops *ops,
>  	const struct backlight_properties *props)
> @@ -415,6 +454,15 @@ struct backlight_device *backlight_device_register(const char *name,
>  }
>  EXPORT_SYMBOL(backlight_device_register);
>  
> +/** backlight_device_get_by_type - find first backlight device of a type
> + * @type: the type of backlight device
> + *
> + * Look up the first backlight device of the specified type
> + *
> + * RETURNS:
> + *
> + * Pointer to backlight device if any was found. Otherwise NULL.
> + */
>  struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
>  {
>  	bool found = false;
> @@ -433,12 +481,7 @@ struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
>  }
>  EXPORT_SYMBOL(backlight_device_get_by_type);
>  
> -/**
> - * backlight_device_unregister - unregisters a backlight device object.
> - * @bd: the backlight device object to be unregistered and freed.
> - *
> - * Unregisters a previously registered via backlight_device_register object.
> - */
> +/* deprecated - use devm_backlight_device_unregister() */
>  void backlight_device_unregister(struct backlight_device *bd)
>  {
>  	if (!bd)
> @@ -486,10 +529,12 @@ static int devm_backlight_device_match(struct device *dev, void *res,
>   * backlight_register_notifier - get notified of backlight (un)registration
>   * @nb: notifier block with the notifier to call on backlight (un)registration
>   *
> - * @return 0 on success, otherwise a negative error code
> - *
>   * Register a notifier to get notified when backlight devices get registered
>   * or unregistered.
> + *
> + * RETURNS:
> + *
> + * 0 on success, otherwise a negative error code
>   */
>  int backlight_register_notifier(struct notifier_block *nb)
>  {
> @@ -501,10 +546,12 @@ EXPORT_SYMBOL(backlight_register_notifier);
>   * backlight_unregister_notifier - unregister a backlight notifier
>   * @nb: notifier block to unregister
>   *
> - * @return 0 on success, otherwise a negative error code
> - *
>   * Register a notifier to get notified when backlight devices get registered
>   * or unregistered.
> + *
> + * RETURNS:
> + *
> + * 0 on success, otherwise a negative error code
>   */
>  int backlight_unregister_notifier(struct notifier_block *nb)
>  {
> @@ -513,20 +560,22 @@ int backlight_unregister_notifier(struct notifier_block *nb)
>  EXPORT_SYMBOL(backlight_unregister_notifier);
>  
>  /**
> - * devm_backlight_device_register - resource managed backlight_device_register()
> + * devm_backlight_device_register - register a new backlight device
>   * @dev: the device to register
>   * @name: the name of the device
> - * @parent: a pointer to the parent device
> + * @parent: a pointer to the parent device (often the same as @dev)
>   * @devdata: an optional pointer to be stored for private driver use
>   * @ops: the backlight operations structure
>   * @props: the backlight properties
>   *
> - * @return a struct backlight on success, or an ERR_PTR on error
> + * Creates and registers new backlight device. When a backlight device
> + * is registered the configuration must be specified in the @props
> + * parameter. See description of &backlight_properties.
>   *
> - * Managed backlight_device_register(). The backlight_device returned
> - * from this function are automatically freed on driver detach.
> - * See backlight_device_register() for more information.
> - */
> + * RETURNS:
> + *
> + * struct backlight on success, or an ERR_PTR on error
> +*/
>  struct backlight_device *devm_backlight_device_register(struct device *dev,
>  	const char *name, struct device *parent, void *devdata,
>  	const struct backlight_ops *ops,
> @@ -553,13 +602,13 @@ struct backlight_device *devm_backlight_device_register(struct device *dev,
>  EXPORT_SYMBOL(devm_backlight_device_register);
>  
>  /**
> - * devm_backlight_device_unregister - resource managed backlight_device_unregister()
> + * devm_backlight_device_unregister - unregister backlight device
>   * @dev: the device to unregister
>   * @bd: the backlight device to unregister
>   *
> - * Deallocated a backlight allocated with devm_backlight_device_register().
> + * Deallocates a backlight allocated with devm_backlight_device_register().
>   * Normally this function will not need to be called and the resource management
> - * code will ensure that the resource is freed.
> + * code will ensure that the resources are freed.
>   */
>  void devm_backlight_device_unregister(struct device *dev,
>  				struct backlight_device *bd)
> @@ -650,8 +699,8 @@ static void devm_backlight_release(void *data)
>  }
>  
>  /**
> - * devm_of_find_backlight - Resource-managed of_find_backlight()
> - * @dev: Device
> + * devm_of_find_backlight - find backlight for a device
> + * @dev: the device
>   *
>   * Device managed version of of_find_backlight().
>   * The reference on the backlight device is automatically
> -- 
> 2.25.1
> 
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Re: [PATCH v3 12/13] backlight: as3711_bl: introduce backlight_is_blank()

[Daniel Thompson]

On Mon, Jun 01, 2020 at 08:52:06AM +0200, Sam Ravnborg wrote:
> Replaces the open-coded checks of the state, with the
> backlight_is_blank() helper. This increases readability
> of the code and aling the functionality across the drivers.
> 
> Futhermore drop the debug prints in update_status().
> If we need debug printing then we can add it to the backlight core.
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>


> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> Cc: Emil Velikov <emil.l.velikov@gmail.com>
> ---
>  drivers/video/backlight/as3711_bl.c | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/drivers/video/backlight/as3711_bl.c b/drivers/video/backlight/as3711_bl.c
> index 33f0f0f2e8b3..cc5628beaffd 100644
> --- a/drivers/video/backlight/as3711_bl.c
> +++ b/drivers/video/backlight/as3711_bl.c
> @@ -107,13 +107,7 @@ static int as3711_bl_update_status(struct backlight_device *bl)
>  	int brightness = bl->props.brightness;
>  	int ret = 0;
>  
> -	dev_dbg(&bl->dev, "%s(): brightness %u, pwr %x, blank %x, state %x\n",
> -		__func__, bl->props.brightness, bl->props.power,
> -		bl->props.fb_blank, bl->props.state);
> -
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	if (data->type == AS3711_BL_SU1) {
> -- 
> 2.25.1
> 

Re: [PATCH v3 12/13] backlight: as3711_bl: introduce backlight_is_blank()

[Daniel Thompson]

On Mon, Jun 01, 2020 at 08:52:06AM +0200, Sam Ravnborg wrote:
> Replaces the open-coded checks of the state, with the
> backlight_is_blank() helper. This increases readability
> of the code and aling the functionality across the drivers.
> 
> Futhermore drop the debug prints in update_status().
> If we need debug printing then we can add it to the backlight core.
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>


> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> Cc: Emil Velikov <emil.l.velikov@gmail.com>
> ---
>  drivers/video/backlight/as3711_bl.c | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/drivers/video/backlight/as3711_bl.c b/drivers/video/backlight/as3711_bl.c
> index 33f0f0f2e8b3..cc5628beaffd 100644
> --- a/drivers/video/backlight/as3711_bl.c
> +++ b/drivers/video/backlight/as3711_bl.c
> @@ -107,13 +107,7 @@ static int as3711_bl_update_status(struct backlight_device *bl)
>  	int brightness = bl->props.brightness;
>  	int ret = 0;
>  
> -	dev_dbg(&bl->dev, "%s(): brightness %u, pwr %x, blank %x, state %x\n",
> -		__func__, bl->props.brightness, bl->props.power,
> -		bl->props.fb_blank, bl->props.state);
> -
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	if (data->type == AS3711_BL_SU1) {
> -- 
> 2.25.1
> 

Re: [PATCH v3 12/13] backlight: as3711_bl: introduce backlight_is_blank()

[Daniel Thompson]

On Mon, Jun 01, 2020 at 08:52:06AM +0200, Sam Ravnborg wrote:
> Replaces the open-coded checks of the state, with the
> backlight_is_blank() helper. This increases readability
> of the code and aling the functionality across the drivers.
> 
> Futhermore drop the debug prints in update_status().
> If we need debug printing then we can add it to the backlight core.
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>


> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> Cc: Emil Velikov <emil.l.velikov@gmail.com>
> ---
>  drivers/video/backlight/as3711_bl.c | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/drivers/video/backlight/as3711_bl.c b/drivers/video/backlight/as3711_bl.c
> index 33f0f0f2e8b3..cc5628beaffd 100644
> --- a/drivers/video/backlight/as3711_bl.c
> +++ b/drivers/video/backlight/as3711_bl.c
> @@ -107,13 +107,7 @@ static int as3711_bl_update_status(struct backlight_device *bl)
>  	int brightness = bl->props.brightness;
>  	int ret = 0;
>  
> -	dev_dbg(&bl->dev, "%s(): brightness %u, pwr %x, blank %x, state %x\n",
> -		__func__, bl->props.brightness, bl->props.power,
> -		bl->props.fb_blank, bl->props.state);
> -
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	if (data->type == AS3711_BL_SU1) {
> -- 
> 2.25.1
> 
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Re: [PATCH v3 02/13] backlight: add backlight_is_blank()

[Peter Ujfalusi]

[-- Attachment #1: Type: text/plain, Size: 2880 bytes --]



On 01/06/2020 9.51, Sam Ravnborg wrote:
> The backlight support has two properties that express the state:
> - power
> - state
> 
> It is un-documented and easy to get wrong.
> Add backlight_is_blank() helper to make it simpler
> for drivers to get the check of the state correct.
> 
> A lot of drivers also includes checks for fb_blank.
> This check is redundant when the state is checked
> and thus not needed in this helper function.
> But added anyway to avoid introducing subtle bugs
> due to the creative use of fb_blank in some drivers.
> Introducing this helper will for some drivers results in
> added support for fb_blank. This will be a change in
> functionality, which will improve the backlight driver.
> 
> Rolling out this helper to all relevant backlight drivers
> will eliminate almost all accesses to fb_blank.

Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>

> 
> v3:
>   - Clarified that the fb_blank support in
>     backlight_is_blank() may result in functionality
>     changes for the users (Emil)
> 
> v2:
>   - Added fb_blank condition (Daniel)
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Emil Velikov <emil.l.velikov@gmail.com>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> ---
>  include/linux/backlight.h | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/include/linux/backlight.h b/include/linux/backlight.h
> index c7d6b2e8c3b5..a0a083b35c47 100644
> --- a/include/linux/backlight.h
> +++ b/include/linux/backlight.h
> @@ -175,6 +175,25 @@ static inline void backlight_put(struct backlight_device *bd)
>  		put_device(&bd->dev);
>  }
>  
> +/**
> + * backlight_is_blank - Return true if display is expected to be blank
> + * @bd: the backlight device
> + *
> + * Display is expected to be blank if any of these is true::
> + *
> + *   1) if power in not UNBLANK
> + *   2) if fb_blank is not UNBLANK
> + *   3) if state indicate BLANK or SUSPENDED
> + *
> + * Returns true if display is expected to be blank, false otherwise.
> + */
> +static inline bool backlight_is_blank(struct backlight_device *bd)
> +{
> +	return bd->props.power != FB_BLANK_UNBLANK ||
> +	       bd->props.fb_blank != FB_BLANK_UNBLANK ||
> +	       bd->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK);
> +}
> +
>  extern struct backlight_device *backlight_device_register(const char *name,
>  	struct device *dev, void *devdata, const struct backlight_ops *ops,
>  	const struct backlight_properties *props);
> 

- Péter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

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Re: [PATCH v3 02/13] backlight: add backlight_is_blank()

[Peter Ujfalusi]

[-- Attachment #1: Type: text/plain, Size: 2880 bytes --]



On 01/06/2020 9.51, Sam Ravnborg wrote:
> The backlight support has two properties that express the state:
> - power
> - state
> 
> It is un-documented and easy to get wrong.
> Add backlight_is_blank() helper to make it simpler
> for drivers to get the check of the state correct.
> 
> A lot of drivers also includes checks for fb_blank.
> This check is redundant when the state is checked
> and thus not needed in this helper function.
> But added anyway to avoid introducing subtle bugs
> due to the creative use of fb_blank in some drivers.
> Introducing this helper will for some drivers results in
> added support for fb_blank. This will be a change in
> functionality, which will improve the backlight driver.
> 
> Rolling out this helper to all relevant backlight drivers
> will eliminate almost all accesses to fb_blank.

Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>

> 
> v3:
>   - Clarified that the fb_blank support in
>     backlight_is_blank() may result in functionality
>     changes for the users (Emil)
> 
> v2:
>   - Added fb_blank condition (Daniel)
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Emil Velikov <emil.l.velikov@gmail.com>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> ---
>  include/linux/backlight.h | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/include/linux/backlight.h b/include/linux/backlight.h
> index c7d6b2e8c3b5..a0a083b35c47 100644
> --- a/include/linux/backlight.h
> +++ b/include/linux/backlight.h
> @@ -175,6 +175,25 @@ static inline void backlight_put(struct backlight_device *bd)
>  		put_device(&bd->dev);
>  }
>  
> +/**
> + * backlight_is_blank - Return true if display is expected to be blank
> + * @bd: the backlight device
> + *
> + * Display is expected to be blank if any of these is true::
> + *
> + *   1) if power in not UNBLANK
> + *   2) if fb_blank is not UNBLANK
> + *   3) if state indicate BLANK or SUSPENDED
> + *
> + * Returns true if display is expected to be blank, false otherwise.
> + */
> +static inline bool backlight_is_blank(struct backlight_device *bd)
> +{
> +	return bd->props.power != FB_BLANK_UNBLANK ||
> +	       bd->props.fb_blank != FB_BLANK_UNBLANK ||
> +	       bd->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK);
> +}
> +
>  extern struct backlight_device *backlight_device_register(const char *name,
>  	struct device *dev, void *devdata, const struct backlight_ops *ops,
>  	const struct backlight_properties *props);
> 

- Péter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

[-- Attachment #2: pEpkey.asc --]
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Re: [PATCH v3 02/13] backlight: add backlight_is_blank()

[Peter Ujfalusi]

[-- Attachment #1: Type: text/plain, Size: 2880 bytes --]



On 01/06/2020 9.51, Sam Ravnborg wrote:
> The backlight support has two properties that express the state:
> - power
> - state
> 
> It is un-documented and easy to get wrong.
> Add backlight_is_blank() helper to make it simpler
> for drivers to get the check of the state correct.
> 
> A lot of drivers also includes checks for fb_blank.
> This check is redundant when the state is checked
> and thus not needed in this helper function.
> But added anyway to avoid introducing subtle bugs
> due to the creative use of fb_blank in some drivers.
> Introducing this helper will for some drivers results in
> added support for fb_blank. This will be a change in
> functionality, which will improve the backlight driver.
> 
> Rolling out this helper to all relevant backlight drivers
> will eliminate almost all accesses to fb_blank.

Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>

> 
> v3:
>   - Clarified that the fb_blank support in
>     backlight_is_blank() may result in functionality
>     changes for the users (Emil)
> 
> v2:
>   - Added fb_blank condition (Daniel)
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Emil Velikov <emil.l.velikov@gmail.com>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> ---
>  include/linux/backlight.h | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/include/linux/backlight.h b/include/linux/backlight.h
> index c7d6b2e8c3b5..a0a083b35c47 100644
> --- a/include/linux/backlight.h
> +++ b/include/linux/backlight.h
> @@ -175,6 +175,25 @@ static inline void backlight_put(struct backlight_device *bd)
>  		put_device(&bd->dev);
>  }
>  
> +/**
> + * backlight_is_blank - Return true if display is expected to be blank
> + * @bd: the backlight device
> + *
> + * Display is expected to be blank if any of these is true::
> + *
> + *   1) if power in not UNBLANK
> + *   2) if fb_blank is not UNBLANK
> + *   3) if state indicate BLANK or SUSPENDED
> + *
> + * Returns true if display is expected to be blank, false otherwise.
> + */
> +static inline bool backlight_is_blank(struct backlight_device *bd)
> +{
> +	return bd->props.power != FB_BLANK_UNBLANK ||
> +	       bd->props.fb_blank != FB_BLANK_UNBLANK ||
> +	       bd->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK);
> +}
> +
>  extern struct backlight_device *backlight_device_register(const char *name,
>  	struct device *dev, void *devdata, const struct backlight_ops *ops,
>  	const struct backlight_properties *props);
> 

- Péter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

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_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH v3 13/13] backlight: use backlight_is_blank() in all backlight drivers

[Peter Ujfalusi]

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On 01/06/2020 9.52, Sam Ravnborg wrote:
> Replaces the open-coded checks of the state etc.,
> with the backlight_is_blank() helper.
> This increases readability of the code and align
> the functionality across the drivers.

Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>

> v3:
>   - Dropped as3711_bl, it will be modified in another patch
> 
> v2:
>   - Fixed so changelog is readable
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> Cc: Michael Hennerich <michael.hennerich@analog.com>
> Cc: Support Opensource <support.opensource@diasemi.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
> Cc: Andy Gross <agross@kernel.org>
> Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
> Cc: linux-pwm@vger.kernel.org
> Cc: linux-arm-msm@vger.kernel.org
> Cc: patches@opensource.cirrus.com
> ---
>  drivers/video/backlight/88pm860x_bl.c    |  8 +-------
>  drivers/video/backlight/adp5520_bl.c     |  5 +----
>  drivers/video/backlight/adp8860_bl.c     |  5 +----
>  drivers/video/backlight/adp8870_bl.c     |  5 +----
>  drivers/video/backlight/bd6107.c         |  4 +---
>  drivers/video/backlight/corgi_lcd.c      |  5 +----
>  drivers/video/backlight/cr_bllcd.c       | 22 +++++++---------------
>  drivers/video/backlight/da903x_bl.c      |  8 +-------
>  drivers/video/backlight/ep93xx_bl.c      |  3 +--
>  drivers/video/backlight/gpio_backlight.c |  4 +---
>  drivers/video/backlight/hp680_bl.c       |  4 +---
>  drivers/video/backlight/jornada720_bl.c  |  2 +-
>  drivers/video/backlight/kb3886_bl.c      |  4 +---
>  drivers/video/backlight/led_bl.c         |  4 +---
>  drivers/video/backlight/lm3533_bl.c      |  4 +---
>  drivers/video/backlight/locomolcd.c      |  4 +---
>  drivers/video/backlight/lv5207lp.c       |  4 +---
>  drivers/video/backlight/max8925_bl.c     |  8 +-------
>  drivers/video/backlight/pwm_bl.c         |  4 +---
>  drivers/video/backlight/qcom-wled.c      |  4 +---
>  drivers/video/backlight/tps65217_bl.c    |  4 +---
>  drivers/video/backlight/wm831x_bl.c      |  8 +-------
>  22 files changed, 28 insertions(+), 95 deletions(-)
> 
> diff --git a/drivers/video/backlight/88pm860x_bl.c b/drivers/video/backlight/88pm860x_bl.c
> index 20d96a5ac384..162c83ab0f5a 100644
> --- a/drivers/video/backlight/88pm860x_bl.c
> +++ b/drivers/video/backlight/88pm860x_bl.c
> @@ -123,13 +123,7 @@ static int pm860x_backlight_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.state & BL_CORE_SUSPENDED)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return pm860x_backlight_set(bl, brightness);
> diff --git a/drivers/video/backlight/adp5520_bl.c b/drivers/video/backlight/adp5520_bl.c
> index 0f63f76723a5..d817b0d95c9d 100644
> --- a/drivers/video/backlight/adp5520_bl.c
> +++ b/drivers/video/backlight/adp5520_bl.c
> @@ -67,10 +67,7 @@ static int adp5520_bl_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return adp5520_bl_set(bl, brightness);
> diff --git a/drivers/video/backlight/adp8860_bl.c b/drivers/video/backlight/adp8860_bl.c
> index 19968104fc47..a0ce2a3701fa 100644
> --- a/drivers/video/backlight/adp8860_bl.c
> +++ b/drivers/video/backlight/adp8860_bl.c
> @@ -363,10 +363,7 @@ static int adp8860_bl_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return adp8860_bl_set(bl, brightness);
> diff --git a/drivers/video/backlight/adp8870_bl.c b/drivers/video/backlight/adp8870_bl.c
> index 4c0032010cfe..ae4269fdb189 100644
> --- a/drivers/video/backlight/adp8870_bl.c
> +++ b/drivers/video/backlight/adp8870_bl.c
> @@ -401,10 +401,7 @@ static int adp8870_bl_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return adp8870_bl_set(bl, brightness);
> diff --git a/drivers/video/backlight/bd6107.c b/drivers/video/backlight/bd6107.c
> index d5d5fb457e78..f6a5c1dba3bc 100644
> --- a/drivers/video/backlight/bd6107.c
> +++ b/drivers/video/backlight/bd6107.c
> @@ -84,9 +84,7 @@ static int bd6107_backlight_update_status(struct backlight_device *backlight)
>  	struct bd6107 *bd = bl_get_data(backlight);
>  	int brightness = backlight->props.brightness;
>  
> -	if (backlight->props.power != FB_BLANK_UNBLANK ||
> -	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> +	if (backlight_is_blank(backlight))
>  		brightness = 0;
>  
>  	if (brightness) {
> diff --git a/drivers/video/backlight/corgi_lcd.c b/drivers/video/backlight/corgi_lcd.c
> index 25ef0cbd7583..c9adf4e26355 100644
> --- a/drivers/video/backlight/corgi_lcd.c
> +++ b/drivers/video/backlight/corgi_lcd.c
> @@ -422,10 +422,7 @@ static int corgi_bl_update_status(struct backlight_device *bd)
>  	struct corgi_lcd *lcd = bl_get_data(bd);
>  	int intensity = bd->props.brightness;
>  
> -	if (bd->props.power != FB_BLANK_UNBLANK)
> -		intensity = 0;
> -
> -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bd))
>  		intensity = 0;
>  
>  	if (corgibl_flags & CORGIBL_SUSPENDED)
> diff --git a/drivers/video/backlight/cr_bllcd.c b/drivers/video/backlight/cr_bllcd.c
> index 4624b7b7c6a6..d5ab7675f55c 100644
> --- a/drivers/video/backlight/cr_bllcd.c
> +++ b/drivers/video/backlight/cr_bllcd.c
> @@ -59,26 +59,18 @@ struct cr_panel {
>  
>  static int cr_backlight_set_intensity(struct backlight_device *bd)
>  {
> -	int intensity = bd->props.brightness;
>  	u32 addr = gpio_bar + CRVML_PANEL_PORT;
>  	u32 cur = inl(addr);
>  
> -	if (bd->props.power == FB_BLANK_UNBLANK)
> -		intensity = FB_BLANK_UNBLANK;
> -	if (bd->props.fb_blank == FB_BLANK_UNBLANK)
> -		intensity = FB_BLANK_UNBLANK;
> -	if (bd->props.power == FB_BLANK_POWERDOWN)
> -		intensity = FB_BLANK_POWERDOWN;
> -	if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
> -		intensity = FB_BLANK_POWERDOWN;
> -
> -	if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
> -		cur &= ~CRVML_BACKLIGHT_OFF;
> -		outl(cur, addr);
> -	} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
> +	if (backlight_is_blank(bd)) {
> +		/* OFF */
>  		cur |= CRVML_BACKLIGHT_OFF;
>  		outl(cur, addr);
> -	} /* anything else, don't bother */
> +	} else {
> +		/* FULL ON */
> +		cur &= ~CRVML_BACKLIGHT_OFF;
> +		outl(cur, addr);
> +	}
>  
>  	return 0;
>  }
> diff --git a/drivers/video/backlight/da903x_bl.c b/drivers/video/backlight/da903x_bl.c
> index 62540e4bdedb..ca351badfdcf 100644
> --- a/drivers/video/backlight/da903x_bl.c
> +++ b/drivers/video/backlight/da903x_bl.c
> @@ -79,13 +79,7 @@ static int da903x_backlight_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.state & BL_CORE_SUSPENDED)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return da903x_backlight_set(bl, brightness);
> diff --git a/drivers/video/backlight/ep93xx_bl.c b/drivers/video/backlight/ep93xx_bl.c
> index 4149e0b2f83c..491185df1411 100644
> --- a/drivers/video/backlight/ep93xx_bl.c
> +++ b/drivers/video/backlight/ep93xx_bl.c
> @@ -38,8 +38,7 @@ static int ep93xxbl_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return ep93xxbl_set(bl, brightness);
> diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
> index 75409ddfba3e..94b65e4d2aa0 100644
> --- a/drivers/video/backlight/gpio_backlight.c
> +++ b/drivers/video/backlight/gpio_backlight.c
> @@ -25,9 +25,7 @@ static int gpio_backlight_get_next_brightness(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return brightness;
> diff --git a/drivers/video/backlight/hp680_bl.c b/drivers/video/backlight/hp680_bl.c
> index 8ea42b8d9bc8..01d805ca8415 100644
> --- a/drivers/video/backlight/hp680_bl.c
> +++ b/drivers/video/backlight/hp680_bl.c
> @@ -35,9 +35,7 @@ static void hp680bl_send_intensity(struct backlight_device *bd)
>  	u16 v;
>  	int intensity = bd->props.brightness;
>  
> -	if (bd->props.power != FB_BLANK_UNBLANK)
> -		intensity = 0;
> -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bd))
>  		intensity = 0;
>  	if (hp680bl_suspended)
>  		intensity = 0;
> diff --git a/drivers/video/backlight/jornada720_bl.c b/drivers/video/backlight/jornada720_bl.c
> index f0385f9cf9da..996f7ba3b373 100644
> --- a/drivers/video/backlight/jornada720_bl.c
> +++ b/drivers/video/backlight/jornada720_bl.c
> @@ -54,7 +54,7 @@ static int jornada_bl_update_status(struct backlight_device *bd)
>  	jornada_ssp_start();
>  
>  	/* If backlight is off then really turn it off */
> -	if ((bd->props.power != FB_BLANK_UNBLANK) || (bd->props.fb_blank != FB_BLANK_UNBLANK)) {
> +	if (backlight_is_blank(bd)) {
>  		ret = jornada_ssp_byte(BRIGHTNESSOFF);
>  		if (ret != TXDUMMY) {
>  			dev_info(&bd->dev, "brightness off timeout\n");
> diff --git a/drivers/video/backlight/kb3886_bl.c b/drivers/video/backlight/kb3886_bl.c
> index 1dfe13c18925..a0fd5d3d82f5 100644
> --- a/drivers/video/backlight/kb3886_bl.c
> +++ b/drivers/video/backlight/kb3886_bl.c
> @@ -89,9 +89,7 @@ static int kb3886bl_send_intensity(struct backlight_device *bd)
>  {
>  	int intensity = bd->props.brightness;
>  
> -	if (bd->props.power != FB_BLANK_UNBLANK)
> -		intensity = 0;
> -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bd))
>  		intensity = 0;
>  	if (kb3886bl_flags & KB3886BL_SUSPENDED)
>  		intensity = 0;
> diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c
> index 3f66549997c8..c655ddd99cfb 100644
> --- a/drivers/video/backlight/led_bl.c
> +++ b/drivers/video/backlight/led_bl.c
> @@ -56,9 +56,7 @@ static int led_bl_update_status(struct backlight_device *bl)
>  	struct led_bl_data *priv = bl_get_data(bl);
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    bl->props.state & BL_CORE_FBBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	if (brightness > 0)
> diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
> index ee09d1bd02b9..476146b62c4e 100644
> --- a/drivers/video/backlight/lm3533_bl.c
> +++ b/drivers/video/backlight/lm3533_bl.c
> @@ -41,9 +41,7 @@ static int lm3533_bl_update_status(struct backlight_device *bd)
>  	struct lm3533_bl *bl = bl_get_data(bd);
>  	int brightness = bd->props.brightness;
>  
> -	if (bd->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bd))
>  		brightness = 0;
>  
>  	return lm3533_ctrlbank_set_brightness(&bl->cb, (u8)brightness);
> diff --git a/drivers/video/backlight/locomolcd.c b/drivers/video/backlight/locomolcd.c
> index cdc02e04f89d..8064cad8d683 100644
> --- a/drivers/video/backlight/locomolcd.c
> +++ b/drivers/video/backlight/locomolcd.c
> @@ -113,9 +113,7 @@ static int locomolcd_set_intensity(struct backlight_device *bd)
>  {
>  	int intensity = bd->props.brightness;
>  
> -	if (bd->props.power != FB_BLANK_UNBLANK)
> -		intensity = 0;
> -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bd))
>  		intensity = 0;
>  	if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
>  		intensity = 0;
> diff --git a/drivers/video/backlight/lv5207lp.c b/drivers/video/backlight/lv5207lp.c
> index c6ad73a784e2..ef8aa9803577 100644
> --- a/drivers/video/backlight/lv5207lp.c
> +++ b/drivers/video/backlight/lv5207lp.c
> @@ -48,9 +48,7 @@ static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
>  	struct lv5207lp *lv = bl_get_data(backlight);
>  	int brightness = backlight->props.brightness;
>  
> -	if (backlight->props.power != FB_BLANK_UNBLANK ||
> -	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> +	if (backlight_is_blank(backlight))
>  		brightness = 0;
>  
>  	if (brightness) {
> diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c
> index 97cc260ff9d1..b8af2c6407d3 100644
> --- a/drivers/video/backlight/max8925_bl.c
> +++ b/drivers/video/backlight/max8925_bl.c
> @@ -66,13 +66,7 @@ static int max8925_backlight_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.state & BL_CORE_SUSPENDED)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return max8925_backlight_set(bl, brightness);
> diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
> index 82b8d7594701..7d0ffcd37f07 100644
> --- a/drivers/video/backlight/pwm_bl.c
> +++ b/drivers/video/backlight/pwm_bl.c
> @@ -111,9 +111,7 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
>  	int brightness = bl->props.brightness;
>  	struct pwm_state state;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    bl->props.state & BL_CORE_FBBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	if (pb->notify)
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> index 3d276b30a78c..9600f5d58ece 100644
> --- a/drivers/video/backlight/qcom-wled.c
> +++ b/drivers/video/backlight/qcom-wled.c
> @@ -261,9 +261,7 @@ static int wled_update_status(struct backlight_device *bl)
>  	u16 brightness = bl->props.brightness;
>  	int rc = 0;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    bl->props.state & BL_CORE_FBBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	mutex_lock(&wled->lock);
> diff --git a/drivers/video/backlight/tps65217_bl.c b/drivers/video/backlight/tps65217_bl.c
> index 762e3feed097..1041e5e62ee3 100644
> --- a/drivers/video/backlight/tps65217_bl.c
> +++ b/drivers/video/backlight/tps65217_bl.c
> @@ -82,9 +82,7 @@ static int tps65217_bl_update_status(struct backlight_device *bl)
>  	if (bl->props.state & BL_CORE_SUSPENDED)
>  		brightness = 0;
>  
> -	if ((bl->props.power != FB_BLANK_UNBLANK) ||
> -		(bl->props.fb_blank != FB_BLANK_UNBLANK))
> -		/* framebuffer in low power mode or blanking active */
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	if (brightness > 0) {
> diff --git a/drivers/video/backlight/wm831x_bl.c b/drivers/video/backlight/wm831x_bl.c
> index e55977d54c15..dc2ab6c8b7f9 100644
> --- a/drivers/video/backlight/wm831x_bl.c
> +++ b/drivers/video/backlight/wm831x_bl.c
> @@ -93,13 +93,7 @@ static int wm831x_backlight_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.state & BL_CORE_SUSPENDED)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return wm831x_backlight_set(bl, brightness);
> 

- Péter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

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Re: [PATCH v3 13/13] backlight: use backlight_is_blank() in all backlight drivers

[Peter Ujfalusi]

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On 01/06/2020 9.52, Sam Ravnborg wrote:
> Replaces the open-coded checks of the state etc.,
> with the backlight_is_blank() helper.
> This increases readability of the code and align
> the functionality across the drivers.

Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>

> v3:
>   - Dropped as3711_bl, it will be modified in another patch
> 
> v2:
>   - Fixed so changelog is readable
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> Cc: Michael Hennerich <michael.hennerich@analog.com>
> Cc: Support Opensource <support.opensource@diasemi.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
> Cc: Andy Gross <agross@kernel.org>
> Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
> Cc: linux-pwm@vger.kernel.org
> Cc: linux-arm-msm@vger.kernel.org
> Cc: patches@opensource.cirrus.com
> ---
>  drivers/video/backlight/88pm860x_bl.c    |  8 +-------
>  drivers/video/backlight/adp5520_bl.c     |  5 +----
>  drivers/video/backlight/adp8860_bl.c     |  5 +----
>  drivers/video/backlight/adp8870_bl.c     |  5 +----
>  drivers/video/backlight/bd6107.c         |  4 +---
>  drivers/video/backlight/corgi_lcd.c      |  5 +----
>  drivers/video/backlight/cr_bllcd.c       | 22 +++++++---------------
>  drivers/video/backlight/da903x_bl.c      |  8 +-------
>  drivers/video/backlight/ep93xx_bl.c      |  3 +--
>  drivers/video/backlight/gpio_backlight.c |  4 +---
>  drivers/video/backlight/hp680_bl.c       |  4 +---
>  drivers/video/backlight/jornada720_bl.c  |  2 +-
>  drivers/video/backlight/kb3886_bl.c      |  4 +---
>  drivers/video/backlight/led_bl.c         |  4 +---
>  drivers/video/backlight/lm3533_bl.c      |  4 +---
>  drivers/video/backlight/locomolcd.c      |  4 +---
>  drivers/video/backlight/lv5207lp.c       |  4 +---
>  drivers/video/backlight/max8925_bl.c     |  8 +-------
>  drivers/video/backlight/pwm_bl.c         |  4 +---
>  drivers/video/backlight/qcom-wled.c      |  4 +---
>  drivers/video/backlight/tps65217_bl.c    |  4 +---
>  drivers/video/backlight/wm831x_bl.c      |  8 +-------
>  22 files changed, 28 insertions(+), 95 deletions(-)
> 
> diff --git a/drivers/video/backlight/88pm860x_bl.c b/drivers/video/backlight/88pm860x_bl.c
> index 20d96a5ac384..162c83ab0f5a 100644
> --- a/drivers/video/backlight/88pm860x_bl.c
> +++ b/drivers/video/backlight/88pm860x_bl.c
> @@ -123,13 +123,7 @@ static int pm860x_backlight_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.state & BL_CORE_SUSPENDED)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return pm860x_backlight_set(bl, brightness);
> diff --git a/drivers/video/backlight/adp5520_bl.c b/drivers/video/backlight/adp5520_bl.c
> index 0f63f76723a5..d817b0d95c9d 100644
> --- a/drivers/video/backlight/adp5520_bl.c
> +++ b/drivers/video/backlight/adp5520_bl.c
> @@ -67,10 +67,7 @@ static int adp5520_bl_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return adp5520_bl_set(bl, brightness);
> diff --git a/drivers/video/backlight/adp8860_bl.c b/drivers/video/backlight/adp8860_bl.c
> index 19968104fc47..a0ce2a3701fa 100644
> --- a/drivers/video/backlight/adp8860_bl.c
> +++ b/drivers/video/backlight/adp8860_bl.c
> @@ -363,10 +363,7 @@ static int adp8860_bl_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return adp8860_bl_set(bl, brightness);
> diff --git a/drivers/video/backlight/adp8870_bl.c b/drivers/video/backlight/adp8870_bl.c
> index 4c0032010cfe..ae4269fdb189 100644
> --- a/drivers/video/backlight/adp8870_bl.c
> +++ b/drivers/video/backlight/adp8870_bl.c
> @@ -401,10 +401,7 @@ static int adp8870_bl_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return adp8870_bl_set(bl, brightness);
> diff --git a/drivers/video/backlight/bd6107.c b/drivers/video/backlight/bd6107.c
> index d5d5fb457e78..f6a5c1dba3bc 100644
> --- a/drivers/video/backlight/bd6107.c
> +++ b/drivers/video/backlight/bd6107.c
> @@ -84,9 +84,7 @@ static int bd6107_backlight_update_status(struct backlight_device *backlight)
>  	struct bd6107 *bd = bl_get_data(backlight);
>  	int brightness = backlight->props.brightness;
>  
> -	if (backlight->props.power != FB_BLANK_UNBLANK ||
> -	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> +	if (backlight_is_blank(backlight))
>  		brightness = 0;
>  
>  	if (brightness) {
> diff --git a/drivers/video/backlight/corgi_lcd.c b/drivers/video/backlight/corgi_lcd.c
> index 25ef0cbd7583..c9adf4e26355 100644
> --- a/drivers/video/backlight/corgi_lcd.c
> +++ b/drivers/video/backlight/corgi_lcd.c
> @@ -422,10 +422,7 @@ static int corgi_bl_update_status(struct backlight_device *bd)
>  	struct corgi_lcd *lcd = bl_get_data(bd);
>  	int intensity = bd->props.brightness;
>  
> -	if (bd->props.power != FB_BLANK_UNBLANK)
> -		intensity = 0;
> -
> -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bd))
>  		intensity = 0;
>  
>  	if (corgibl_flags & CORGIBL_SUSPENDED)
> diff --git a/drivers/video/backlight/cr_bllcd.c b/drivers/video/backlight/cr_bllcd.c
> index 4624b7b7c6a6..d5ab7675f55c 100644
> --- a/drivers/video/backlight/cr_bllcd.c
> +++ b/drivers/video/backlight/cr_bllcd.c
> @@ -59,26 +59,18 @@ struct cr_panel {
>  
>  static int cr_backlight_set_intensity(struct backlight_device *bd)
>  {
> -	int intensity = bd->props.brightness;
>  	u32 addr = gpio_bar + CRVML_PANEL_PORT;
>  	u32 cur = inl(addr);
>  
> -	if (bd->props.power == FB_BLANK_UNBLANK)
> -		intensity = FB_BLANK_UNBLANK;
> -	if (bd->props.fb_blank == FB_BLANK_UNBLANK)
> -		intensity = FB_BLANK_UNBLANK;
> -	if (bd->props.power == FB_BLANK_POWERDOWN)
> -		intensity = FB_BLANK_POWERDOWN;
> -	if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
> -		intensity = FB_BLANK_POWERDOWN;
> -
> -	if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
> -		cur &= ~CRVML_BACKLIGHT_OFF;
> -		outl(cur, addr);
> -	} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
> +	if (backlight_is_blank(bd)) {
> +		/* OFF */
>  		cur |= CRVML_BACKLIGHT_OFF;
>  		outl(cur, addr);
> -	} /* anything else, don't bother */
> +	} else {
> +		/* FULL ON */
> +		cur &= ~CRVML_BACKLIGHT_OFF;
> +		outl(cur, addr);
> +	}
>  
>  	return 0;
>  }
> diff --git a/drivers/video/backlight/da903x_bl.c b/drivers/video/backlight/da903x_bl.c
> index 62540e4bdedb..ca351badfdcf 100644
> --- a/drivers/video/backlight/da903x_bl.c
> +++ b/drivers/video/backlight/da903x_bl.c
> @@ -79,13 +79,7 @@ static int da903x_backlight_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.state & BL_CORE_SUSPENDED)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return da903x_backlight_set(bl, brightness);
> diff --git a/drivers/video/backlight/ep93xx_bl.c b/drivers/video/backlight/ep93xx_bl.c
> index 4149e0b2f83c..491185df1411 100644
> --- a/drivers/video/backlight/ep93xx_bl.c
> +++ b/drivers/video/backlight/ep93xx_bl.c
> @@ -38,8 +38,7 @@ static int ep93xxbl_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return ep93xxbl_set(bl, brightness);
> diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
> index 75409ddfba3e..94b65e4d2aa0 100644
> --- a/drivers/video/backlight/gpio_backlight.c
> +++ b/drivers/video/backlight/gpio_backlight.c
> @@ -25,9 +25,7 @@ static int gpio_backlight_get_next_brightness(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return brightness;
> diff --git a/drivers/video/backlight/hp680_bl.c b/drivers/video/backlight/hp680_bl.c
> index 8ea42b8d9bc8..01d805ca8415 100644
> --- a/drivers/video/backlight/hp680_bl.c
> +++ b/drivers/video/backlight/hp680_bl.c
> @@ -35,9 +35,7 @@ static void hp680bl_send_intensity(struct backlight_device *bd)
>  	u16 v;
>  	int intensity = bd->props.brightness;
>  
> -	if (bd->props.power != FB_BLANK_UNBLANK)
> -		intensity = 0;
> -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bd))
>  		intensity = 0;
>  	if (hp680bl_suspended)
>  		intensity = 0;
> diff --git a/drivers/video/backlight/jornada720_bl.c b/drivers/video/backlight/jornada720_bl.c
> index f0385f9cf9da..996f7ba3b373 100644
> --- a/drivers/video/backlight/jornada720_bl.c
> +++ b/drivers/video/backlight/jornada720_bl.c
> @@ -54,7 +54,7 @@ static int jornada_bl_update_status(struct backlight_device *bd)
>  	jornada_ssp_start();
>  
>  	/* If backlight is off then really turn it off */
> -	if ((bd->props.power != FB_BLANK_UNBLANK) || (bd->props.fb_blank != FB_BLANK_UNBLANK)) {
> +	if (backlight_is_blank(bd)) {
>  		ret = jornada_ssp_byte(BRIGHTNESSOFF);
>  		if (ret != TXDUMMY) {
>  			dev_info(&bd->dev, "brightness off timeout\n");
> diff --git a/drivers/video/backlight/kb3886_bl.c b/drivers/video/backlight/kb3886_bl.c
> index 1dfe13c18925..a0fd5d3d82f5 100644
> --- a/drivers/video/backlight/kb3886_bl.c
> +++ b/drivers/video/backlight/kb3886_bl.c
> @@ -89,9 +89,7 @@ static int kb3886bl_send_intensity(struct backlight_device *bd)
>  {
>  	int intensity = bd->props.brightness;
>  
> -	if (bd->props.power != FB_BLANK_UNBLANK)
> -		intensity = 0;
> -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bd))
>  		intensity = 0;
>  	if (kb3886bl_flags & KB3886BL_SUSPENDED)
>  		intensity = 0;
> diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c
> index 3f66549997c8..c655ddd99cfb 100644
> --- a/drivers/video/backlight/led_bl.c
> +++ b/drivers/video/backlight/led_bl.c
> @@ -56,9 +56,7 @@ static int led_bl_update_status(struct backlight_device *bl)
>  	struct led_bl_data *priv = bl_get_data(bl);
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    bl->props.state & BL_CORE_FBBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	if (brightness > 0)
> diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
> index ee09d1bd02b9..476146b62c4e 100644
> --- a/drivers/video/backlight/lm3533_bl.c
> +++ b/drivers/video/backlight/lm3533_bl.c
> @@ -41,9 +41,7 @@ static int lm3533_bl_update_status(struct backlight_device *bd)
>  	struct lm3533_bl *bl = bl_get_data(bd);
>  	int brightness = bd->props.brightness;
>  
> -	if (bd->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bd))
>  		brightness = 0;
>  
>  	return lm3533_ctrlbank_set_brightness(&bl->cb, (u8)brightness);
> diff --git a/drivers/video/backlight/locomolcd.c b/drivers/video/backlight/locomolcd.c
> index cdc02e04f89d..8064cad8d683 100644
> --- a/drivers/video/backlight/locomolcd.c
> +++ b/drivers/video/backlight/locomolcd.c
> @@ -113,9 +113,7 @@ static int locomolcd_set_intensity(struct backlight_device *bd)
>  {
>  	int intensity = bd->props.brightness;
>  
> -	if (bd->props.power != FB_BLANK_UNBLANK)
> -		intensity = 0;
> -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bd))
>  		intensity = 0;
>  	if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
>  		intensity = 0;
> diff --git a/drivers/video/backlight/lv5207lp.c b/drivers/video/backlight/lv5207lp.c
> index c6ad73a784e2..ef8aa9803577 100644
> --- a/drivers/video/backlight/lv5207lp.c
> +++ b/drivers/video/backlight/lv5207lp.c
> @@ -48,9 +48,7 @@ static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
>  	struct lv5207lp *lv = bl_get_data(backlight);
>  	int brightness = backlight->props.brightness;
>  
> -	if (backlight->props.power != FB_BLANK_UNBLANK ||
> -	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> +	if (backlight_is_blank(backlight))
>  		brightness = 0;
>  
>  	if (brightness) {
> diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c
> index 97cc260ff9d1..b8af2c6407d3 100644
> --- a/drivers/video/backlight/max8925_bl.c
> +++ b/drivers/video/backlight/max8925_bl.c
> @@ -66,13 +66,7 @@ static int max8925_backlight_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.state & BL_CORE_SUSPENDED)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return max8925_backlight_set(bl, brightness);
> diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
> index 82b8d7594701..7d0ffcd37f07 100644
> --- a/drivers/video/backlight/pwm_bl.c
> +++ b/drivers/video/backlight/pwm_bl.c
> @@ -111,9 +111,7 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
>  	int brightness = bl->props.brightness;
>  	struct pwm_state state;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    bl->props.state & BL_CORE_FBBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	if (pb->notify)
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> index 3d276b30a78c..9600f5d58ece 100644
> --- a/drivers/video/backlight/qcom-wled.c
> +++ b/drivers/video/backlight/qcom-wled.c
> @@ -261,9 +261,7 @@ static int wled_update_status(struct backlight_device *bl)
>  	u16 brightness = bl->props.brightness;
>  	int rc = 0;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    bl->props.state & BL_CORE_FBBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	mutex_lock(&wled->lock);
> diff --git a/drivers/video/backlight/tps65217_bl.c b/drivers/video/backlight/tps65217_bl.c
> index 762e3feed097..1041e5e62ee3 100644
> --- a/drivers/video/backlight/tps65217_bl.c
> +++ b/drivers/video/backlight/tps65217_bl.c
> @@ -82,9 +82,7 @@ static int tps65217_bl_update_status(struct backlight_device *bl)
>  	if (bl->props.state & BL_CORE_SUSPENDED)
>  		brightness = 0;
>  
> -	if ((bl->props.power != FB_BLANK_UNBLANK) ||
> -		(bl->props.fb_blank != FB_BLANK_UNBLANK))
> -		/* framebuffer in low power mode or blanking active */
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	if (brightness > 0) {
> diff --git a/drivers/video/backlight/wm831x_bl.c b/drivers/video/backlight/wm831x_bl.c
> index e55977d54c15..dc2ab6c8b7f9 100644
> --- a/drivers/video/backlight/wm831x_bl.c
> +++ b/drivers/video/backlight/wm831x_bl.c
> @@ -93,13 +93,7 @@ static int wm831x_backlight_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.state & BL_CORE_SUSPENDED)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return wm831x_backlight_set(bl, brightness);
> 

- Péter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

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Re: [PATCH v3 13/13] backlight: use backlight_is_blank() in all backlight drivers

[Peter Ujfalusi]

[-- Attachment #1: Type: text/plain, Size: 17093 bytes --]



On 01/06/2020 9.52, Sam Ravnborg wrote:
> Replaces the open-coded checks of the state etc.,
> with the backlight_is_blank() helper.
> This increases readability of the code and align
> the functionality across the drivers.

Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>

> v3:
>   - Dropped as3711_bl, it will be modified in another patch
> 
> v2:
>   - Fixed so changelog is readable
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> Cc: Michael Hennerich <michael.hennerich@analog.com>
> Cc: Support Opensource <support.opensource@diasemi.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
> Cc: Andy Gross <agross@kernel.org>
> Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
> Cc: linux-pwm@vger.kernel.org
> Cc: linux-arm-msm@vger.kernel.org
> Cc: patches@opensource.cirrus.com
> ---
>  drivers/video/backlight/88pm860x_bl.c    |  8 +-------
>  drivers/video/backlight/adp5520_bl.c     |  5 +----
>  drivers/video/backlight/adp8860_bl.c     |  5 +----
>  drivers/video/backlight/adp8870_bl.c     |  5 +----
>  drivers/video/backlight/bd6107.c         |  4 +---
>  drivers/video/backlight/corgi_lcd.c      |  5 +----
>  drivers/video/backlight/cr_bllcd.c       | 22 +++++++---------------
>  drivers/video/backlight/da903x_bl.c      |  8 +-------
>  drivers/video/backlight/ep93xx_bl.c      |  3 +--
>  drivers/video/backlight/gpio_backlight.c |  4 +---
>  drivers/video/backlight/hp680_bl.c       |  4 +---
>  drivers/video/backlight/jornada720_bl.c  |  2 +-
>  drivers/video/backlight/kb3886_bl.c      |  4 +---
>  drivers/video/backlight/led_bl.c         |  4 +---
>  drivers/video/backlight/lm3533_bl.c      |  4 +---
>  drivers/video/backlight/locomolcd.c      |  4 +---
>  drivers/video/backlight/lv5207lp.c       |  4 +---
>  drivers/video/backlight/max8925_bl.c     |  8 +-------
>  drivers/video/backlight/pwm_bl.c         |  4 +---
>  drivers/video/backlight/qcom-wled.c      |  4 +---
>  drivers/video/backlight/tps65217_bl.c    |  4 +---
>  drivers/video/backlight/wm831x_bl.c      |  8 +-------
>  22 files changed, 28 insertions(+), 95 deletions(-)
> 
> diff --git a/drivers/video/backlight/88pm860x_bl.c b/drivers/video/backlight/88pm860x_bl.c
> index 20d96a5ac384..162c83ab0f5a 100644
> --- a/drivers/video/backlight/88pm860x_bl.c
> +++ b/drivers/video/backlight/88pm860x_bl.c
> @@ -123,13 +123,7 @@ static int pm860x_backlight_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.state & BL_CORE_SUSPENDED)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return pm860x_backlight_set(bl, brightness);
> diff --git a/drivers/video/backlight/adp5520_bl.c b/drivers/video/backlight/adp5520_bl.c
> index 0f63f76723a5..d817b0d95c9d 100644
> --- a/drivers/video/backlight/adp5520_bl.c
> +++ b/drivers/video/backlight/adp5520_bl.c
> @@ -67,10 +67,7 @@ static int adp5520_bl_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return adp5520_bl_set(bl, brightness);
> diff --git a/drivers/video/backlight/adp8860_bl.c b/drivers/video/backlight/adp8860_bl.c
> index 19968104fc47..a0ce2a3701fa 100644
> --- a/drivers/video/backlight/adp8860_bl.c
> +++ b/drivers/video/backlight/adp8860_bl.c
> @@ -363,10 +363,7 @@ static int adp8860_bl_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return adp8860_bl_set(bl, brightness);
> diff --git a/drivers/video/backlight/adp8870_bl.c b/drivers/video/backlight/adp8870_bl.c
> index 4c0032010cfe..ae4269fdb189 100644
> --- a/drivers/video/backlight/adp8870_bl.c
> +++ b/drivers/video/backlight/adp8870_bl.c
> @@ -401,10 +401,7 @@ static int adp8870_bl_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return adp8870_bl_set(bl, brightness);
> diff --git a/drivers/video/backlight/bd6107.c b/drivers/video/backlight/bd6107.c
> index d5d5fb457e78..f6a5c1dba3bc 100644
> --- a/drivers/video/backlight/bd6107.c
> +++ b/drivers/video/backlight/bd6107.c
> @@ -84,9 +84,7 @@ static int bd6107_backlight_update_status(struct backlight_device *backlight)
>  	struct bd6107 *bd = bl_get_data(backlight);
>  	int brightness = backlight->props.brightness;
>  
> -	if (backlight->props.power != FB_BLANK_UNBLANK ||
> -	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> +	if (backlight_is_blank(backlight))
>  		brightness = 0;
>  
>  	if (brightness) {
> diff --git a/drivers/video/backlight/corgi_lcd.c b/drivers/video/backlight/corgi_lcd.c
> index 25ef0cbd7583..c9adf4e26355 100644
> --- a/drivers/video/backlight/corgi_lcd.c
> +++ b/drivers/video/backlight/corgi_lcd.c
> @@ -422,10 +422,7 @@ static int corgi_bl_update_status(struct backlight_device *bd)
>  	struct corgi_lcd *lcd = bl_get_data(bd);
>  	int intensity = bd->props.brightness;
>  
> -	if (bd->props.power != FB_BLANK_UNBLANK)
> -		intensity = 0;
> -
> -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bd))
>  		intensity = 0;
>  
>  	if (corgibl_flags & CORGIBL_SUSPENDED)
> diff --git a/drivers/video/backlight/cr_bllcd.c b/drivers/video/backlight/cr_bllcd.c
> index 4624b7b7c6a6..d5ab7675f55c 100644
> --- a/drivers/video/backlight/cr_bllcd.c
> +++ b/drivers/video/backlight/cr_bllcd.c
> @@ -59,26 +59,18 @@ struct cr_panel {
>  
>  static int cr_backlight_set_intensity(struct backlight_device *bd)
>  {
> -	int intensity = bd->props.brightness;
>  	u32 addr = gpio_bar + CRVML_PANEL_PORT;
>  	u32 cur = inl(addr);
>  
> -	if (bd->props.power == FB_BLANK_UNBLANK)
> -		intensity = FB_BLANK_UNBLANK;
> -	if (bd->props.fb_blank == FB_BLANK_UNBLANK)
> -		intensity = FB_BLANK_UNBLANK;
> -	if (bd->props.power == FB_BLANK_POWERDOWN)
> -		intensity = FB_BLANK_POWERDOWN;
> -	if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
> -		intensity = FB_BLANK_POWERDOWN;
> -
> -	if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
> -		cur &= ~CRVML_BACKLIGHT_OFF;
> -		outl(cur, addr);
> -	} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
> +	if (backlight_is_blank(bd)) {
> +		/* OFF */
>  		cur |= CRVML_BACKLIGHT_OFF;
>  		outl(cur, addr);
> -	} /* anything else, don't bother */
> +	} else {
> +		/* FULL ON */
> +		cur &= ~CRVML_BACKLIGHT_OFF;
> +		outl(cur, addr);
> +	}
>  
>  	return 0;
>  }
> diff --git a/drivers/video/backlight/da903x_bl.c b/drivers/video/backlight/da903x_bl.c
> index 62540e4bdedb..ca351badfdcf 100644
> --- a/drivers/video/backlight/da903x_bl.c
> +++ b/drivers/video/backlight/da903x_bl.c
> @@ -79,13 +79,7 @@ static int da903x_backlight_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.state & BL_CORE_SUSPENDED)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return da903x_backlight_set(bl, brightness);
> diff --git a/drivers/video/backlight/ep93xx_bl.c b/drivers/video/backlight/ep93xx_bl.c
> index 4149e0b2f83c..491185df1411 100644
> --- a/drivers/video/backlight/ep93xx_bl.c
> +++ b/drivers/video/backlight/ep93xx_bl.c
> @@ -38,8 +38,7 @@ static int ep93xxbl_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return ep93xxbl_set(bl, brightness);
> diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
> index 75409ddfba3e..94b65e4d2aa0 100644
> --- a/drivers/video/backlight/gpio_backlight.c
> +++ b/drivers/video/backlight/gpio_backlight.c
> @@ -25,9 +25,7 @@ static int gpio_backlight_get_next_brightness(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return brightness;
> diff --git a/drivers/video/backlight/hp680_bl.c b/drivers/video/backlight/hp680_bl.c
> index 8ea42b8d9bc8..01d805ca8415 100644
> --- a/drivers/video/backlight/hp680_bl.c
> +++ b/drivers/video/backlight/hp680_bl.c
> @@ -35,9 +35,7 @@ static void hp680bl_send_intensity(struct backlight_device *bd)
>  	u16 v;
>  	int intensity = bd->props.brightness;
>  
> -	if (bd->props.power != FB_BLANK_UNBLANK)
> -		intensity = 0;
> -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bd))
>  		intensity = 0;
>  	if (hp680bl_suspended)
>  		intensity = 0;
> diff --git a/drivers/video/backlight/jornada720_bl.c b/drivers/video/backlight/jornada720_bl.c
> index f0385f9cf9da..996f7ba3b373 100644
> --- a/drivers/video/backlight/jornada720_bl.c
> +++ b/drivers/video/backlight/jornada720_bl.c
> @@ -54,7 +54,7 @@ static int jornada_bl_update_status(struct backlight_device *bd)
>  	jornada_ssp_start();
>  
>  	/* If backlight is off then really turn it off */
> -	if ((bd->props.power != FB_BLANK_UNBLANK) || (bd->props.fb_blank != FB_BLANK_UNBLANK)) {
> +	if (backlight_is_blank(bd)) {
>  		ret = jornada_ssp_byte(BRIGHTNESSOFF);
>  		if (ret != TXDUMMY) {
>  			dev_info(&bd->dev, "brightness off timeout\n");
> diff --git a/drivers/video/backlight/kb3886_bl.c b/drivers/video/backlight/kb3886_bl.c
> index 1dfe13c18925..a0fd5d3d82f5 100644
> --- a/drivers/video/backlight/kb3886_bl.c
> +++ b/drivers/video/backlight/kb3886_bl.c
> @@ -89,9 +89,7 @@ static int kb3886bl_send_intensity(struct backlight_device *bd)
>  {
>  	int intensity = bd->props.brightness;
>  
> -	if (bd->props.power != FB_BLANK_UNBLANK)
> -		intensity = 0;
> -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bd))
>  		intensity = 0;
>  	if (kb3886bl_flags & KB3886BL_SUSPENDED)
>  		intensity = 0;
> diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c
> index 3f66549997c8..c655ddd99cfb 100644
> --- a/drivers/video/backlight/led_bl.c
> +++ b/drivers/video/backlight/led_bl.c
> @@ -56,9 +56,7 @@ static int led_bl_update_status(struct backlight_device *bl)
>  	struct led_bl_data *priv = bl_get_data(bl);
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    bl->props.state & BL_CORE_FBBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	if (brightness > 0)
> diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
> index ee09d1bd02b9..476146b62c4e 100644
> --- a/drivers/video/backlight/lm3533_bl.c
> +++ b/drivers/video/backlight/lm3533_bl.c
> @@ -41,9 +41,7 @@ static int lm3533_bl_update_status(struct backlight_device *bd)
>  	struct lm3533_bl *bl = bl_get_data(bd);
>  	int brightness = bd->props.brightness;
>  
> -	if (bd->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bd))
>  		brightness = 0;
>  
>  	return lm3533_ctrlbank_set_brightness(&bl->cb, (u8)brightness);
> diff --git a/drivers/video/backlight/locomolcd.c b/drivers/video/backlight/locomolcd.c
> index cdc02e04f89d..8064cad8d683 100644
> --- a/drivers/video/backlight/locomolcd.c
> +++ b/drivers/video/backlight/locomolcd.c
> @@ -113,9 +113,7 @@ static int locomolcd_set_intensity(struct backlight_device *bd)
>  {
>  	int intensity = bd->props.brightness;
>  
> -	if (bd->props.power != FB_BLANK_UNBLANK)
> -		intensity = 0;
> -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> +	if (backlight_is_blank(bd))
>  		intensity = 0;
>  	if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
>  		intensity = 0;
> diff --git a/drivers/video/backlight/lv5207lp.c b/drivers/video/backlight/lv5207lp.c
> index c6ad73a784e2..ef8aa9803577 100644
> --- a/drivers/video/backlight/lv5207lp.c
> +++ b/drivers/video/backlight/lv5207lp.c
> @@ -48,9 +48,7 @@ static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
>  	struct lv5207lp *lv = bl_get_data(backlight);
>  	int brightness = backlight->props.brightness;
>  
> -	if (backlight->props.power != FB_BLANK_UNBLANK ||
> -	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> +	if (backlight_is_blank(backlight))
>  		brightness = 0;
>  
>  	if (brightness) {
> diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c
> index 97cc260ff9d1..b8af2c6407d3 100644
> --- a/drivers/video/backlight/max8925_bl.c
> +++ b/drivers/video/backlight/max8925_bl.c
> @@ -66,13 +66,7 @@ static int max8925_backlight_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.state & BL_CORE_SUSPENDED)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return max8925_backlight_set(bl, brightness);
> diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
> index 82b8d7594701..7d0ffcd37f07 100644
> --- a/drivers/video/backlight/pwm_bl.c
> +++ b/drivers/video/backlight/pwm_bl.c
> @@ -111,9 +111,7 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
>  	int brightness = bl->props.brightness;
>  	struct pwm_state state;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    bl->props.state & BL_CORE_FBBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	if (pb->notify)
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> index 3d276b30a78c..9600f5d58ece 100644
> --- a/drivers/video/backlight/qcom-wled.c
> +++ b/drivers/video/backlight/qcom-wled.c
> @@ -261,9 +261,7 @@ static int wled_update_status(struct backlight_device *bl)
>  	u16 brightness = bl->props.brightness;
>  	int rc = 0;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> -	    bl->props.state & BL_CORE_FBBLANK)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	mutex_lock(&wled->lock);
> diff --git a/drivers/video/backlight/tps65217_bl.c b/drivers/video/backlight/tps65217_bl.c
> index 762e3feed097..1041e5e62ee3 100644
> --- a/drivers/video/backlight/tps65217_bl.c
> +++ b/drivers/video/backlight/tps65217_bl.c
> @@ -82,9 +82,7 @@ static int tps65217_bl_update_status(struct backlight_device *bl)
>  	if (bl->props.state & BL_CORE_SUSPENDED)
>  		brightness = 0;
>  
> -	if ((bl->props.power != FB_BLANK_UNBLANK) ||
> -		(bl->props.fb_blank != FB_BLANK_UNBLANK))
> -		/* framebuffer in low power mode or blanking active */
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	if (brightness > 0) {
> diff --git a/drivers/video/backlight/wm831x_bl.c b/drivers/video/backlight/wm831x_bl.c
> index e55977d54c15..dc2ab6c8b7f9 100644
> --- a/drivers/video/backlight/wm831x_bl.c
> +++ b/drivers/video/backlight/wm831x_bl.c
> @@ -93,13 +93,7 @@ static int wm831x_backlight_update_status(struct backlight_device *bl)
>  {
>  	int brightness = bl->props.brightness;
>  
> -	if (bl->props.power != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> -		brightness = 0;
> -
> -	if (bl->props.state & BL_CORE_SUSPENDED)
> +	if (backlight_is_blank(bl))
>  		brightness = 0;
>  
>  	return wm831x_backlight_set(bl, brightness);
> 

- Péter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

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Re: [PATCH v3 13/13] backlight: use backlight_is_blank() in all backlight drivers

[Sam Ravnborg]

On Mon, Jun 01, 2020 at 03:28:01PM +0300, Peter Ujfalusi wrote:
> 
> 
> On 01/06/2020 9.52, Sam Ravnborg wrote:
> > Replaces the open-coded checks of the state etc.,
> > with the backlight_is_blank() helper.
> > This increases readability of the code and align
> > the functionality across the drivers.
> 
> Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Thanks, I missed your previsous r-b. Sorry.

	Sam

> 
> > v3:
> >   - Dropped as3711_bl, it will be modified in another patch
> > 
> > v2:
> >   - Fixed so changelog is readable
> > 
> > Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> > Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
> > Cc: Lee Jones <lee.jones@linaro.org>
> > Cc: Daniel Thompson <daniel.thompson@linaro.org>
> > Cc: Jingoo Han <jingoohan1@gmail.com>
> > Cc: Michael Hennerich <michael.hennerich@analog.com>
> > Cc: Support Opensource <support.opensource@diasemi.com>
> > Cc: Thierry Reding <thierry.reding@gmail.com>
> > Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
> > Cc: Andy Gross <agross@kernel.org>
> > Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
> > Cc: linux-pwm@vger.kernel.org
> > Cc: linux-arm-msm@vger.kernel.org
> > Cc: patches@opensource.cirrus.com
> > ---
> >  drivers/video/backlight/88pm860x_bl.c    |  8 +-------
> >  drivers/video/backlight/adp5520_bl.c     |  5 +----
> >  drivers/video/backlight/adp8860_bl.c     |  5 +----
> >  drivers/video/backlight/adp8870_bl.c     |  5 +----
> >  drivers/video/backlight/bd6107.c         |  4 +---
> >  drivers/video/backlight/corgi_lcd.c      |  5 +----
> >  drivers/video/backlight/cr_bllcd.c       | 22 +++++++---------------
> >  drivers/video/backlight/da903x_bl.c      |  8 +-------
> >  drivers/video/backlight/ep93xx_bl.c      |  3 +--
> >  drivers/video/backlight/gpio_backlight.c |  4 +---
> >  drivers/video/backlight/hp680_bl.c       |  4 +---
> >  drivers/video/backlight/jornada720_bl.c  |  2 +-
> >  drivers/video/backlight/kb3886_bl.c      |  4 +---
> >  drivers/video/backlight/led_bl.c         |  4 +---
> >  drivers/video/backlight/lm3533_bl.c      |  4 +---
> >  drivers/video/backlight/locomolcd.c      |  4 +---
> >  drivers/video/backlight/lv5207lp.c       |  4 +---
> >  drivers/video/backlight/max8925_bl.c     |  8 +-------
> >  drivers/video/backlight/pwm_bl.c         |  4 +---
> >  drivers/video/backlight/qcom-wled.c      |  4 +---
> >  drivers/video/backlight/tps65217_bl.c    |  4 +---
> >  drivers/video/backlight/wm831x_bl.c      |  8 +-------
> >  22 files changed, 28 insertions(+), 95 deletions(-)
> > 
> > diff --git a/drivers/video/backlight/88pm860x_bl.c b/drivers/video/backlight/88pm860x_bl.c
> > index 20d96a5ac384..162c83ab0f5a 100644
> > --- a/drivers/video/backlight/88pm860x_bl.c
> > +++ b/drivers/video/backlight/88pm860x_bl.c
> > @@ -123,13 +123,7 @@ static int pm860x_backlight_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.state & BL_CORE_SUSPENDED)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return pm860x_backlight_set(bl, brightness);
> > diff --git a/drivers/video/backlight/adp5520_bl.c b/drivers/video/backlight/adp5520_bl.c
> > index 0f63f76723a5..d817b0d95c9d 100644
> > --- a/drivers/video/backlight/adp5520_bl.c
> > +++ b/drivers/video/backlight/adp5520_bl.c
> > @@ -67,10 +67,7 @@ static int adp5520_bl_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return adp5520_bl_set(bl, brightness);
> > diff --git a/drivers/video/backlight/adp8860_bl.c b/drivers/video/backlight/adp8860_bl.c
> > index 19968104fc47..a0ce2a3701fa 100644
> > --- a/drivers/video/backlight/adp8860_bl.c
> > +++ b/drivers/video/backlight/adp8860_bl.c
> > @@ -363,10 +363,7 @@ static int adp8860_bl_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return adp8860_bl_set(bl, brightness);
> > diff --git a/drivers/video/backlight/adp8870_bl.c b/drivers/video/backlight/adp8870_bl.c
> > index 4c0032010cfe..ae4269fdb189 100644
> > --- a/drivers/video/backlight/adp8870_bl.c
> > +++ b/drivers/video/backlight/adp8870_bl.c
> > @@ -401,10 +401,7 @@ static int adp8870_bl_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return adp8870_bl_set(bl, brightness);
> > diff --git a/drivers/video/backlight/bd6107.c b/drivers/video/backlight/bd6107.c
> > index d5d5fb457e78..f6a5c1dba3bc 100644
> > --- a/drivers/video/backlight/bd6107.c
> > +++ b/drivers/video/backlight/bd6107.c
> > @@ -84,9 +84,7 @@ static int bd6107_backlight_update_status(struct backlight_device *backlight)
> >  	struct bd6107 *bd = bl_get_data(backlight);
> >  	int brightness = backlight->props.brightness;
> >  
> > -	if (backlight->props.power != FB_BLANK_UNBLANK ||
> > -	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> > +	if (backlight_is_blank(backlight))
> >  		brightness = 0;
> >  
> >  	if (brightness) {
> > diff --git a/drivers/video/backlight/corgi_lcd.c b/drivers/video/backlight/corgi_lcd.c
> > index 25ef0cbd7583..c9adf4e26355 100644
> > --- a/drivers/video/backlight/corgi_lcd.c
> > +++ b/drivers/video/backlight/corgi_lcd.c
> > @@ -422,10 +422,7 @@ static int corgi_bl_update_status(struct backlight_device *bd)
> >  	struct corgi_lcd *lcd = bl_get_data(bd);
> >  	int intensity = bd->props.brightness;
> >  
> > -	if (bd->props.power != FB_BLANK_UNBLANK)
> > -		intensity = 0;
> > -
> > -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bd))
> >  		intensity = 0;
> >  
> >  	if (corgibl_flags & CORGIBL_SUSPENDED)
> > diff --git a/drivers/video/backlight/cr_bllcd.c b/drivers/video/backlight/cr_bllcd.c
> > index 4624b7b7c6a6..d5ab7675f55c 100644
> > --- a/drivers/video/backlight/cr_bllcd.c
> > +++ b/drivers/video/backlight/cr_bllcd.c
> > @@ -59,26 +59,18 @@ struct cr_panel {
> >  
> >  static int cr_backlight_set_intensity(struct backlight_device *bd)
> >  {
> > -	int intensity = bd->props.brightness;
> >  	u32 addr = gpio_bar + CRVML_PANEL_PORT;
> >  	u32 cur = inl(addr);
> >  
> > -	if (bd->props.power == FB_BLANK_UNBLANK)
> > -		intensity = FB_BLANK_UNBLANK;
> > -	if (bd->props.fb_blank == FB_BLANK_UNBLANK)
> > -		intensity = FB_BLANK_UNBLANK;
> > -	if (bd->props.power == FB_BLANK_POWERDOWN)
> > -		intensity = FB_BLANK_POWERDOWN;
> > -	if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
> > -		intensity = FB_BLANK_POWERDOWN;
> > -
> > -	if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
> > -		cur &= ~CRVML_BACKLIGHT_OFF;
> > -		outl(cur, addr);
> > -	} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
> > +	if (backlight_is_blank(bd)) {
> > +		/* OFF */
> >  		cur |= CRVML_BACKLIGHT_OFF;
> >  		outl(cur, addr);
> > -	} /* anything else, don't bother */
> > +	} else {
> > +		/* FULL ON */
> > +		cur &= ~CRVML_BACKLIGHT_OFF;
> > +		outl(cur, addr);
> > +	}
> >  
> >  	return 0;
> >  }
> > diff --git a/drivers/video/backlight/da903x_bl.c b/drivers/video/backlight/da903x_bl.c
> > index 62540e4bdedb..ca351badfdcf 100644
> > --- a/drivers/video/backlight/da903x_bl.c
> > +++ b/drivers/video/backlight/da903x_bl.c
> > @@ -79,13 +79,7 @@ static int da903x_backlight_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.state & BL_CORE_SUSPENDED)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return da903x_backlight_set(bl, brightness);
> > diff --git a/drivers/video/backlight/ep93xx_bl.c b/drivers/video/backlight/ep93xx_bl.c
> > index 4149e0b2f83c..491185df1411 100644
> > --- a/drivers/video/backlight/ep93xx_bl.c
> > +++ b/drivers/video/backlight/ep93xx_bl.c
> > @@ -38,8 +38,7 @@ static int ep93xxbl_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK ||
> > -	    bl->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return ep93xxbl_set(bl, brightness);
> > diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
> > index 75409ddfba3e..94b65e4d2aa0 100644
> > --- a/drivers/video/backlight/gpio_backlight.c
> > +++ b/drivers/video/backlight/gpio_backlight.c
> > @@ -25,9 +25,7 @@ static int gpio_backlight_get_next_brightness(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK ||
> > -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return brightness;
> > diff --git a/drivers/video/backlight/hp680_bl.c b/drivers/video/backlight/hp680_bl.c
> > index 8ea42b8d9bc8..01d805ca8415 100644
> > --- a/drivers/video/backlight/hp680_bl.c
> > +++ b/drivers/video/backlight/hp680_bl.c
> > @@ -35,9 +35,7 @@ static void hp680bl_send_intensity(struct backlight_device *bd)
> >  	u16 v;
> >  	int intensity = bd->props.brightness;
> >  
> > -	if (bd->props.power != FB_BLANK_UNBLANK)
> > -		intensity = 0;
> > -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bd))
> >  		intensity = 0;
> >  	if (hp680bl_suspended)
> >  		intensity = 0;
> > diff --git a/drivers/video/backlight/jornada720_bl.c b/drivers/video/backlight/jornada720_bl.c
> > index f0385f9cf9da..996f7ba3b373 100644
> > --- a/drivers/video/backlight/jornada720_bl.c
> > +++ b/drivers/video/backlight/jornada720_bl.c
> > @@ -54,7 +54,7 @@ static int jornada_bl_update_status(struct backlight_device *bd)
> >  	jornada_ssp_start();
> >  
> >  	/* If backlight is off then really turn it off */
> > -	if ((bd->props.power != FB_BLANK_UNBLANK) || (bd->props.fb_blank != FB_BLANK_UNBLANK)) {
> > +	if (backlight_is_blank(bd)) {
> >  		ret = jornada_ssp_byte(BRIGHTNESSOFF);
> >  		if (ret != TXDUMMY) {
> >  			dev_info(&bd->dev, "brightness off timeout\n");
> > diff --git a/drivers/video/backlight/kb3886_bl.c b/drivers/video/backlight/kb3886_bl.c
> > index 1dfe13c18925..a0fd5d3d82f5 100644
> > --- a/drivers/video/backlight/kb3886_bl.c
> > +++ b/drivers/video/backlight/kb3886_bl.c
> > @@ -89,9 +89,7 @@ static int kb3886bl_send_intensity(struct backlight_device *bd)
> >  {
> >  	int intensity = bd->props.brightness;
> >  
> > -	if (bd->props.power != FB_BLANK_UNBLANK)
> > -		intensity = 0;
> > -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bd))
> >  		intensity = 0;
> >  	if (kb3886bl_flags & KB3886BL_SUSPENDED)
> >  		intensity = 0;
> > diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c
> > index 3f66549997c8..c655ddd99cfb 100644
> > --- a/drivers/video/backlight/led_bl.c
> > +++ b/drivers/video/backlight/led_bl.c
> > @@ -56,9 +56,7 @@ static int led_bl_update_status(struct backlight_device *bl)
> >  	struct led_bl_data *priv = bl_get_data(bl);
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK ||
> > -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    bl->props.state & BL_CORE_FBBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	if (brightness > 0)
> > diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
> > index ee09d1bd02b9..476146b62c4e 100644
> > --- a/drivers/video/backlight/lm3533_bl.c
> > +++ b/drivers/video/backlight/lm3533_bl.c
> > @@ -41,9 +41,7 @@ static int lm3533_bl_update_status(struct backlight_device *bd)
> >  	struct lm3533_bl *bl = bl_get_data(bd);
> >  	int brightness = bd->props.brightness;
> >  
> > -	if (bd->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bd))
> >  		brightness = 0;
> >  
> >  	return lm3533_ctrlbank_set_brightness(&bl->cb, (u8)brightness);
> > diff --git a/drivers/video/backlight/locomolcd.c b/drivers/video/backlight/locomolcd.c
> > index cdc02e04f89d..8064cad8d683 100644
> > --- a/drivers/video/backlight/locomolcd.c
> > +++ b/drivers/video/backlight/locomolcd.c
> > @@ -113,9 +113,7 @@ static int locomolcd_set_intensity(struct backlight_device *bd)
> >  {
> >  	int intensity = bd->props.brightness;
> >  
> > -	if (bd->props.power != FB_BLANK_UNBLANK)
> > -		intensity = 0;
> > -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bd))
> >  		intensity = 0;
> >  	if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
> >  		intensity = 0;
> > diff --git a/drivers/video/backlight/lv5207lp.c b/drivers/video/backlight/lv5207lp.c
> > index c6ad73a784e2..ef8aa9803577 100644
> > --- a/drivers/video/backlight/lv5207lp.c
> > +++ b/drivers/video/backlight/lv5207lp.c
> > @@ -48,9 +48,7 @@ static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
> >  	struct lv5207lp *lv = bl_get_data(backlight);
> >  	int brightness = backlight->props.brightness;
> >  
> > -	if (backlight->props.power != FB_BLANK_UNBLANK ||
> > -	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> > +	if (backlight_is_blank(backlight))
> >  		brightness = 0;
> >  
> >  	if (brightness) {
> > diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c
> > index 97cc260ff9d1..b8af2c6407d3 100644
> > --- a/drivers/video/backlight/max8925_bl.c
> > +++ b/drivers/video/backlight/max8925_bl.c
> > @@ -66,13 +66,7 @@ static int max8925_backlight_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.state & BL_CORE_SUSPENDED)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return max8925_backlight_set(bl, brightness);
> > diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
> > index 82b8d7594701..7d0ffcd37f07 100644
> > --- a/drivers/video/backlight/pwm_bl.c
> > +++ b/drivers/video/backlight/pwm_bl.c
> > @@ -111,9 +111,7 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
> >  	int brightness = bl->props.brightness;
> >  	struct pwm_state state;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK ||
> > -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    bl->props.state & BL_CORE_FBBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	if (pb->notify)
> > diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> > index 3d276b30a78c..9600f5d58ece 100644
> > --- a/drivers/video/backlight/qcom-wled.c
> > +++ b/drivers/video/backlight/qcom-wled.c
> > @@ -261,9 +261,7 @@ static int wled_update_status(struct backlight_device *bl)
> >  	u16 brightness = bl->props.brightness;
> >  	int rc = 0;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK ||
> > -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    bl->props.state & BL_CORE_FBBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	mutex_lock(&wled->lock);
> > diff --git a/drivers/video/backlight/tps65217_bl.c b/drivers/video/backlight/tps65217_bl.c
> > index 762e3feed097..1041e5e62ee3 100644
> > --- a/drivers/video/backlight/tps65217_bl.c
> > +++ b/drivers/video/backlight/tps65217_bl.c
> > @@ -82,9 +82,7 @@ static int tps65217_bl_update_status(struct backlight_device *bl)
> >  	if (bl->props.state & BL_CORE_SUSPENDED)
> >  		brightness = 0;
> >  
> > -	if ((bl->props.power != FB_BLANK_UNBLANK) ||
> > -		(bl->props.fb_blank != FB_BLANK_UNBLANK))
> > -		/* framebuffer in low power mode or blanking active */
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	if (brightness > 0) {
> > diff --git a/drivers/video/backlight/wm831x_bl.c b/drivers/video/backlight/wm831x_bl.c
> > index e55977d54c15..dc2ab6c8b7f9 100644
> > --- a/drivers/video/backlight/wm831x_bl.c
> > +++ b/drivers/video/backlight/wm831x_bl.c
> > @@ -93,13 +93,7 @@ static int wm831x_backlight_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.state & BL_CORE_SUSPENDED)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return wm831x_backlight_set(bl, brightness);
> > 
> 
> - Péter
> 
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

Re: [PATCH v3 13/13] backlight: use backlight_is_blank() in all backlight drivers

[Sam Ravnborg]

On Mon, Jun 01, 2020 at 03:28:01PM +0300, Peter Ujfalusi wrote:
> 
> 
> On 01/06/2020 9.52, Sam Ravnborg wrote:
> > Replaces the open-coded checks of the state etc.,
> > with the backlight_is_blank() helper.
> > This increases readability of the code and align
> > the functionality across the drivers.
> 
> Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Thanks, I missed your previsous r-b. Sorry.

	Sam

> 
> > v3:
> >   - Dropped as3711_bl, it will be modified in another patch
> > 
> > v2:
> >   - Fixed so changelog is readable
> > 
> > Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> > Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
> > Cc: Lee Jones <lee.jones@linaro.org>
> > Cc: Daniel Thompson <daniel.thompson@linaro.org>
> > Cc: Jingoo Han <jingoohan1@gmail.com>
> > Cc: Michael Hennerich <michael.hennerich@analog.com>
> > Cc: Support Opensource <support.opensource@diasemi.com>
> > Cc: Thierry Reding <thierry.reding@gmail.com>
> > Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
> > Cc: Andy Gross <agross@kernel.org>
> > Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
> > Cc: linux-pwm@vger.kernel.org
> > Cc: linux-arm-msm@vger.kernel.org
> > Cc: patches@opensource.cirrus.com
> > ---
> >  drivers/video/backlight/88pm860x_bl.c    |  8 +-------
> >  drivers/video/backlight/adp5520_bl.c     |  5 +----
> >  drivers/video/backlight/adp8860_bl.c     |  5 +----
> >  drivers/video/backlight/adp8870_bl.c     |  5 +----
> >  drivers/video/backlight/bd6107.c         |  4 +---
> >  drivers/video/backlight/corgi_lcd.c      |  5 +----
> >  drivers/video/backlight/cr_bllcd.c       | 22 +++++++---------------
> >  drivers/video/backlight/da903x_bl.c      |  8 +-------
> >  drivers/video/backlight/ep93xx_bl.c      |  3 +--
> >  drivers/video/backlight/gpio_backlight.c |  4 +---
> >  drivers/video/backlight/hp680_bl.c       |  4 +---
> >  drivers/video/backlight/jornada720_bl.c  |  2 +-
> >  drivers/video/backlight/kb3886_bl.c      |  4 +---
> >  drivers/video/backlight/led_bl.c         |  4 +---
> >  drivers/video/backlight/lm3533_bl.c      |  4 +---
> >  drivers/video/backlight/locomolcd.c      |  4 +---
> >  drivers/video/backlight/lv5207lp.c       |  4 +---
> >  drivers/video/backlight/max8925_bl.c     |  8 +-------
> >  drivers/video/backlight/pwm_bl.c         |  4 +---
> >  drivers/video/backlight/qcom-wled.c      |  4 +---
> >  drivers/video/backlight/tps65217_bl.c    |  4 +---
> >  drivers/video/backlight/wm831x_bl.c      |  8 +-------
> >  22 files changed, 28 insertions(+), 95 deletions(-)
> > 
> > diff --git a/drivers/video/backlight/88pm860x_bl.c b/drivers/video/backlight/88pm860x_bl.c
> > index 20d96a5ac384..162c83ab0f5a 100644
> > --- a/drivers/video/backlight/88pm860x_bl.c
> > +++ b/drivers/video/backlight/88pm860x_bl.c
> > @@ -123,13 +123,7 @@ static int pm860x_backlight_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.state & BL_CORE_SUSPENDED)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return pm860x_backlight_set(bl, brightness);
> > diff --git a/drivers/video/backlight/adp5520_bl.c b/drivers/video/backlight/adp5520_bl.c
> > index 0f63f76723a5..d817b0d95c9d 100644
> > --- a/drivers/video/backlight/adp5520_bl.c
> > +++ b/drivers/video/backlight/adp5520_bl.c
> > @@ -67,10 +67,7 @@ static int adp5520_bl_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return adp5520_bl_set(bl, brightness);
> > diff --git a/drivers/video/backlight/adp8860_bl.c b/drivers/video/backlight/adp8860_bl.c
> > index 19968104fc47..a0ce2a3701fa 100644
> > --- a/drivers/video/backlight/adp8860_bl.c
> > +++ b/drivers/video/backlight/adp8860_bl.c
> > @@ -363,10 +363,7 @@ static int adp8860_bl_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return adp8860_bl_set(bl, brightness);
> > diff --git a/drivers/video/backlight/adp8870_bl.c b/drivers/video/backlight/adp8870_bl.c
> > index 4c0032010cfe..ae4269fdb189 100644
> > --- a/drivers/video/backlight/adp8870_bl.c
> > +++ b/drivers/video/backlight/adp8870_bl.c
> > @@ -401,10 +401,7 @@ static int adp8870_bl_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return adp8870_bl_set(bl, brightness);
> > diff --git a/drivers/video/backlight/bd6107.c b/drivers/video/backlight/bd6107.c
> > index d5d5fb457e78..f6a5c1dba3bc 100644
> > --- a/drivers/video/backlight/bd6107.c
> > +++ b/drivers/video/backlight/bd6107.c
> > @@ -84,9 +84,7 @@ static int bd6107_backlight_update_status(struct backlight_device *backlight)
> >  	struct bd6107 *bd = bl_get_data(backlight);
> >  	int brightness = backlight->props.brightness;
> >  
> > -	if (backlight->props.power != FB_BLANK_UNBLANK ||
> > -	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> > +	if (backlight_is_blank(backlight))
> >  		brightness = 0;
> >  
> >  	if (brightness) {
> > diff --git a/drivers/video/backlight/corgi_lcd.c b/drivers/video/backlight/corgi_lcd.c
> > index 25ef0cbd7583..c9adf4e26355 100644
> > --- a/drivers/video/backlight/corgi_lcd.c
> > +++ b/drivers/video/backlight/corgi_lcd.c
> > @@ -422,10 +422,7 @@ static int corgi_bl_update_status(struct backlight_device *bd)
> >  	struct corgi_lcd *lcd = bl_get_data(bd);
> >  	int intensity = bd->props.brightness;
> >  
> > -	if (bd->props.power != FB_BLANK_UNBLANK)
> > -		intensity = 0;
> > -
> > -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bd))
> >  		intensity = 0;
> >  
> >  	if (corgibl_flags & CORGIBL_SUSPENDED)
> > diff --git a/drivers/video/backlight/cr_bllcd.c b/drivers/video/backlight/cr_bllcd.c
> > index 4624b7b7c6a6..d5ab7675f55c 100644
> > --- a/drivers/video/backlight/cr_bllcd.c
> > +++ b/drivers/video/backlight/cr_bllcd.c
> > @@ -59,26 +59,18 @@ struct cr_panel {
> >  
> >  static int cr_backlight_set_intensity(struct backlight_device *bd)
> >  {
> > -	int intensity = bd->props.brightness;
> >  	u32 addr = gpio_bar + CRVML_PANEL_PORT;
> >  	u32 cur = inl(addr);
> >  
> > -	if (bd->props.power == FB_BLANK_UNBLANK)
> > -		intensity = FB_BLANK_UNBLANK;
> > -	if (bd->props.fb_blank == FB_BLANK_UNBLANK)
> > -		intensity = FB_BLANK_UNBLANK;
> > -	if (bd->props.power == FB_BLANK_POWERDOWN)
> > -		intensity = FB_BLANK_POWERDOWN;
> > -	if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
> > -		intensity = FB_BLANK_POWERDOWN;
> > -
> > -	if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
> > -		cur &= ~CRVML_BACKLIGHT_OFF;
> > -		outl(cur, addr);
> > -	} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
> > +	if (backlight_is_blank(bd)) {
> > +		/* OFF */
> >  		cur |= CRVML_BACKLIGHT_OFF;
> >  		outl(cur, addr);
> > -	} /* anything else, don't bother */
> > +	} else {
> > +		/* FULL ON */
> > +		cur &= ~CRVML_BACKLIGHT_OFF;
> > +		outl(cur, addr);
> > +	}
> >  
> >  	return 0;
> >  }
> > diff --git a/drivers/video/backlight/da903x_bl.c b/drivers/video/backlight/da903x_bl.c
> > index 62540e4bdedb..ca351badfdcf 100644
> > --- a/drivers/video/backlight/da903x_bl.c
> > +++ b/drivers/video/backlight/da903x_bl.c
> > @@ -79,13 +79,7 @@ static int da903x_backlight_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.state & BL_CORE_SUSPENDED)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return da903x_backlight_set(bl, brightness);
> > diff --git a/drivers/video/backlight/ep93xx_bl.c b/drivers/video/backlight/ep93xx_bl.c
> > index 4149e0b2f83c..491185df1411 100644
> > --- a/drivers/video/backlight/ep93xx_bl.c
> > +++ b/drivers/video/backlight/ep93xx_bl.c
> > @@ -38,8 +38,7 @@ static int ep93xxbl_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK ||
> > -	    bl->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return ep93xxbl_set(bl, brightness);
> > diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
> > index 75409ddfba3e..94b65e4d2aa0 100644
> > --- a/drivers/video/backlight/gpio_backlight.c
> > +++ b/drivers/video/backlight/gpio_backlight.c
> > @@ -25,9 +25,7 @@ static int gpio_backlight_get_next_brightness(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK ||
> > -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return brightness;
> > diff --git a/drivers/video/backlight/hp680_bl.c b/drivers/video/backlight/hp680_bl.c
> > index 8ea42b8d9bc8..01d805ca8415 100644
> > --- a/drivers/video/backlight/hp680_bl.c
> > +++ b/drivers/video/backlight/hp680_bl.c
> > @@ -35,9 +35,7 @@ static void hp680bl_send_intensity(struct backlight_device *bd)
> >  	u16 v;
> >  	int intensity = bd->props.brightness;
> >  
> > -	if (bd->props.power != FB_BLANK_UNBLANK)
> > -		intensity = 0;
> > -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bd))
> >  		intensity = 0;
> >  	if (hp680bl_suspended)
> >  		intensity = 0;
> > diff --git a/drivers/video/backlight/jornada720_bl.c b/drivers/video/backlight/jornada720_bl.c
> > index f0385f9cf9da..996f7ba3b373 100644
> > --- a/drivers/video/backlight/jornada720_bl.c
> > +++ b/drivers/video/backlight/jornada720_bl.c
> > @@ -54,7 +54,7 @@ static int jornada_bl_update_status(struct backlight_device *bd)
> >  	jornada_ssp_start();
> >  
> >  	/* If backlight is off then really turn it off */
> > -	if ((bd->props.power != FB_BLANK_UNBLANK) || (bd->props.fb_blank != FB_BLANK_UNBLANK)) {
> > +	if (backlight_is_blank(bd)) {
> >  		ret = jornada_ssp_byte(BRIGHTNESSOFF);
> >  		if (ret != TXDUMMY) {
> >  			dev_info(&bd->dev, "brightness off timeout\n");
> > diff --git a/drivers/video/backlight/kb3886_bl.c b/drivers/video/backlight/kb3886_bl.c
> > index 1dfe13c18925..a0fd5d3d82f5 100644
> > --- a/drivers/video/backlight/kb3886_bl.c
> > +++ b/drivers/video/backlight/kb3886_bl.c
> > @@ -89,9 +89,7 @@ static int kb3886bl_send_intensity(struct backlight_device *bd)
> >  {
> >  	int intensity = bd->props.brightness;
> >  
> > -	if (bd->props.power != FB_BLANK_UNBLANK)
> > -		intensity = 0;
> > -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bd))
> >  		intensity = 0;
> >  	if (kb3886bl_flags & KB3886BL_SUSPENDED)
> >  		intensity = 0;
> > diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c
> > index 3f66549997c8..c655ddd99cfb 100644
> > --- a/drivers/video/backlight/led_bl.c
> > +++ b/drivers/video/backlight/led_bl.c
> > @@ -56,9 +56,7 @@ static int led_bl_update_status(struct backlight_device *bl)
> >  	struct led_bl_data *priv = bl_get_data(bl);
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK ||
> > -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    bl->props.state & BL_CORE_FBBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	if (brightness > 0)
> > diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
> > index ee09d1bd02b9..476146b62c4e 100644
> > --- a/drivers/video/backlight/lm3533_bl.c
> > +++ b/drivers/video/backlight/lm3533_bl.c
> > @@ -41,9 +41,7 @@ static int lm3533_bl_update_status(struct backlight_device *bd)
> >  	struct lm3533_bl *bl = bl_get_data(bd);
> >  	int brightness = bd->props.brightness;
> >  
> > -	if (bd->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bd))
> >  		brightness = 0;
> >  
> >  	return lm3533_ctrlbank_set_brightness(&bl->cb, (u8)brightness);
> > diff --git a/drivers/video/backlight/locomolcd.c b/drivers/video/backlight/locomolcd.c
> > index cdc02e04f89d..8064cad8d683 100644
> > --- a/drivers/video/backlight/locomolcd.c
> > +++ b/drivers/video/backlight/locomolcd.c
> > @@ -113,9 +113,7 @@ static int locomolcd_set_intensity(struct backlight_device *bd)
> >  {
> >  	int intensity = bd->props.brightness;
> >  
> > -	if (bd->props.power != FB_BLANK_UNBLANK)
> > -		intensity = 0;
> > -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bd))
> >  		intensity = 0;
> >  	if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
> >  		intensity = 0;
> > diff --git a/drivers/video/backlight/lv5207lp.c b/drivers/video/backlight/lv5207lp.c
> > index c6ad73a784e2..ef8aa9803577 100644
> > --- a/drivers/video/backlight/lv5207lp.c
> > +++ b/drivers/video/backlight/lv5207lp.c
> > @@ -48,9 +48,7 @@ static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
> >  	struct lv5207lp *lv = bl_get_data(backlight);
> >  	int brightness = backlight->props.brightness;
> >  
> > -	if (backlight->props.power != FB_BLANK_UNBLANK ||
> > -	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> > +	if (backlight_is_blank(backlight))
> >  		brightness = 0;
> >  
> >  	if (brightness) {
> > diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c
> > index 97cc260ff9d1..b8af2c6407d3 100644
> > --- a/drivers/video/backlight/max8925_bl.c
> > +++ b/drivers/video/backlight/max8925_bl.c
> > @@ -66,13 +66,7 @@ static int max8925_backlight_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.state & BL_CORE_SUSPENDED)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return max8925_backlight_set(bl, brightness);
> > diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
> > index 82b8d7594701..7d0ffcd37f07 100644
> > --- a/drivers/video/backlight/pwm_bl.c
> > +++ b/drivers/video/backlight/pwm_bl.c
> > @@ -111,9 +111,7 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
> >  	int brightness = bl->props.brightness;
> >  	struct pwm_state state;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK ||
> > -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    bl->props.state & BL_CORE_FBBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	if (pb->notify)
> > diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> > index 3d276b30a78c..9600f5d58ece 100644
> > --- a/drivers/video/backlight/qcom-wled.c
> > +++ b/drivers/video/backlight/qcom-wled.c
> > @@ -261,9 +261,7 @@ static int wled_update_status(struct backlight_device *bl)
> >  	u16 brightness = bl->props.brightness;
> >  	int rc = 0;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK ||
> > -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    bl->props.state & BL_CORE_FBBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	mutex_lock(&wled->lock);
> > diff --git a/drivers/video/backlight/tps65217_bl.c b/drivers/video/backlight/tps65217_bl.c
> > index 762e3feed097..1041e5e62ee3 100644
> > --- a/drivers/video/backlight/tps65217_bl.c
> > +++ b/drivers/video/backlight/tps65217_bl.c
> > @@ -82,9 +82,7 @@ static int tps65217_bl_update_status(struct backlight_device *bl)
> >  	if (bl->props.state & BL_CORE_SUSPENDED)
> >  		brightness = 0;
> >  
> > -	if ((bl->props.power != FB_BLANK_UNBLANK) ||
> > -		(bl->props.fb_blank != FB_BLANK_UNBLANK))
> > -		/* framebuffer in low power mode or blanking active */
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	if (brightness > 0) {
> > diff --git a/drivers/video/backlight/wm831x_bl.c b/drivers/video/backlight/wm831x_bl.c
> > index e55977d54c15..dc2ab6c8b7f9 100644
> > --- a/drivers/video/backlight/wm831x_bl.c
> > +++ b/drivers/video/backlight/wm831x_bl.c
> > @@ -93,13 +93,7 @@ static int wm831x_backlight_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.state & BL_CORE_SUSPENDED)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return wm831x_backlight_set(bl, brightness);
> > 
> 
> - Péter
> 
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

Re: [PATCH v3 13/13] backlight: use backlight_is_blank() in all backlight drivers

[Sam Ravnborg]

On Mon, Jun 01, 2020 at 03:28:01PM +0300, Peter Ujfalusi wrote:
> 
> 
> On 01/06/2020 9.52, Sam Ravnborg wrote:
> > Replaces the open-coded checks of the state etc.,
> > with the backlight_is_blank() helper.
> > This increases readability of the code and align
> > the functionality across the drivers.
> 
> Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Thanks, I missed your previsous r-b. Sorry.

	Sam

> 
> > v3:
> >   - Dropped as3711_bl, it will be modified in another patch
> > 
> > v2:
> >   - Fixed so changelog is readable
> > 
> > Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> > Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
> > Cc: Lee Jones <lee.jones@linaro.org>
> > Cc: Daniel Thompson <daniel.thompson@linaro.org>
> > Cc: Jingoo Han <jingoohan1@gmail.com>
> > Cc: Michael Hennerich <michael.hennerich@analog.com>
> > Cc: Support Opensource <support.opensource@diasemi.com>
> > Cc: Thierry Reding <thierry.reding@gmail.com>
> > Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
> > Cc: Andy Gross <agross@kernel.org>
> > Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
> > Cc: linux-pwm@vger.kernel.org
> > Cc: linux-arm-msm@vger.kernel.org
> > Cc: patches@opensource.cirrus.com
> > ---
> >  drivers/video/backlight/88pm860x_bl.c    |  8 +-------
> >  drivers/video/backlight/adp5520_bl.c     |  5 +----
> >  drivers/video/backlight/adp8860_bl.c     |  5 +----
> >  drivers/video/backlight/adp8870_bl.c     |  5 +----
> >  drivers/video/backlight/bd6107.c         |  4 +---
> >  drivers/video/backlight/corgi_lcd.c      |  5 +----
> >  drivers/video/backlight/cr_bllcd.c       | 22 +++++++---------------
> >  drivers/video/backlight/da903x_bl.c      |  8 +-------
> >  drivers/video/backlight/ep93xx_bl.c      |  3 +--
> >  drivers/video/backlight/gpio_backlight.c |  4 +---
> >  drivers/video/backlight/hp680_bl.c       |  4 +---
> >  drivers/video/backlight/jornada720_bl.c  |  2 +-
> >  drivers/video/backlight/kb3886_bl.c      |  4 +---
> >  drivers/video/backlight/led_bl.c         |  4 +---
> >  drivers/video/backlight/lm3533_bl.c      |  4 +---
> >  drivers/video/backlight/locomolcd.c      |  4 +---
> >  drivers/video/backlight/lv5207lp.c       |  4 +---
> >  drivers/video/backlight/max8925_bl.c     |  8 +-------
> >  drivers/video/backlight/pwm_bl.c         |  4 +---
> >  drivers/video/backlight/qcom-wled.c      |  4 +---
> >  drivers/video/backlight/tps65217_bl.c    |  4 +---
> >  drivers/video/backlight/wm831x_bl.c      |  8 +-------
> >  22 files changed, 28 insertions(+), 95 deletions(-)
> > 
> > diff --git a/drivers/video/backlight/88pm860x_bl.c b/drivers/video/backlight/88pm860x_bl.c
> > index 20d96a5ac384..162c83ab0f5a 100644
> > --- a/drivers/video/backlight/88pm860x_bl.c
> > +++ b/drivers/video/backlight/88pm860x_bl.c
> > @@ -123,13 +123,7 @@ static int pm860x_backlight_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.state & BL_CORE_SUSPENDED)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return pm860x_backlight_set(bl, brightness);
> > diff --git a/drivers/video/backlight/adp5520_bl.c b/drivers/video/backlight/adp5520_bl.c
> > index 0f63f76723a5..d817b0d95c9d 100644
> > --- a/drivers/video/backlight/adp5520_bl.c
> > +++ b/drivers/video/backlight/adp5520_bl.c
> > @@ -67,10 +67,7 @@ static int adp5520_bl_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return adp5520_bl_set(bl, brightness);
> > diff --git a/drivers/video/backlight/adp8860_bl.c b/drivers/video/backlight/adp8860_bl.c
> > index 19968104fc47..a0ce2a3701fa 100644
> > --- a/drivers/video/backlight/adp8860_bl.c
> > +++ b/drivers/video/backlight/adp8860_bl.c
> > @@ -363,10 +363,7 @@ static int adp8860_bl_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return adp8860_bl_set(bl, brightness);
> > diff --git a/drivers/video/backlight/adp8870_bl.c b/drivers/video/backlight/adp8870_bl.c
> > index 4c0032010cfe..ae4269fdb189 100644
> > --- a/drivers/video/backlight/adp8870_bl.c
> > +++ b/drivers/video/backlight/adp8870_bl.c
> > @@ -401,10 +401,7 @@ static int adp8870_bl_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return adp8870_bl_set(bl, brightness);
> > diff --git a/drivers/video/backlight/bd6107.c b/drivers/video/backlight/bd6107.c
> > index d5d5fb457e78..f6a5c1dba3bc 100644
> > --- a/drivers/video/backlight/bd6107.c
> > +++ b/drivers/video/backlight/bd6107.c
> > @@ -84,9 +84,7 @@ static int bd6107_backlight_update_status(struct backlight_device *backlight)
> >  	struct bd6107 *bd = bl_get_data(backlight);
> >  	int brightness = backlight->props.brightness;
> >  
> > -	if (backlight->props.power != FB_BLANK_UNBLANK ||
> > -	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> > +	if (backlight_is_blank(backlight))
> >  		brightness = 0;
> >  
> >  	if (brightness) {
> > diff --git a/drivers/video/backlight/corgi_lcd.c b/drivers/video/backlight/corgi_lcd.c
> > index 25ef0cbd7583..c9adf4e26355 100644
> > --- a/drivers/video/backlight/corgi_lcd.c
> > +++ b/drivers/video/backlight/corgi_lcd.c
> > @@ -422,10 +422,7 @@ static int corgi_bl_update_status(struct backlight_device *bd)
> >  	struct corgi_lcd *lcd = bl_get_data(bd);
> >  	int intensity = bd->props.brightness;
> >  
> > -	if (bd->props.power != FB_BLANK_UNBLANK)
> > -		intensity = 0;
> > -
> > -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bd))
> >  		intensity = 0;
> >  
> >  	if (corgibl_flags & CORGIBL_SUSPENDED)
> > diff --git a/drivers/video/backlight/cr_bllcd.c b/drivers/video/backlight/cr_bllcd.c
> > index 4624b7b7c6a6..d5ab7675f55c 100644
> > --- a/drivers/video/backlight/cr_bllcd.c
> > +++ b/drivers/video/backlight/cr_bllcd.c
> > @@ -59,26 +59,18 @@ struct cr_panel {
> >  
> >  static int cr_backlight_set_intensity(struct backlight_device *bd)
> >  {
> > -	int intensity = bd->props.brightness;
> >  	u32 addr = gpio_bar + CRVML_PANEL_PORT;
> >  	u32 cur = inl(addr);
> >  
> > -	if (bd->props.power == FB_BLANK_UNBLANK)
> > -		intensity = FB_BLANK_UNBLANK;
> > -	if (bd->props.fb_blank == FB_BLANK_UNBLANK)
> > -		intensity = FB_BLANK_UNBLANK;
> > -	if (bd->props.power == FB_BLANK_POWERDOWN)
> > -		intensity = FB_BLANK_POWERDOWN;
> > -	if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
> > -		intensity = FB_BLANK_POWERDOWN;
> > -
> > -	if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
> > -		cur &= ~CRVML_BACKLIGHT_OFF;
> > -		outl(cur, addr);
> > -	} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
> > +	if (backlight_is_blank(bd)) {
> > +		/* OFF */
> >  		cur |= CRVML_BACKLIGHT_OFF;
> >  		outl(cur, addr);
> > -	} /* anything else, don't bother */
> > +	} else {
> > +		/* FULL ON */
> > +		cur &= ~CRVML_BACKLIGHT_OFF;
> > +		outl(cur, addr);
> > +	}
> >  
> >  	return 0;
> >  }
> > diff --git a/drivers/video/backlight/da903x_bl.c b/drivers/video/backlight/da903x_bl.c
> > index 62540e4bdedb..ca351badfdcf 100644
> > --- a/drivers/video/backlight/da903x_bl.c
> > +++ b/drivers/video/backlight/da903x_bl.c
> > @@ -79,13 +79,7 @@ static int da903x_backlight_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.state & BL_CORE_SUSPENDED)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return da903x_backlight_set(bl, brightness);
> > diff --git a/drivers/video/backlight/ep93xx_bl.c b/drivers/video/backlight/ep93xx_bl.c
> > index 4149e0b2f83c..491185df1411 100644
> > --- a/drivers/video/backlight/ep93xx_bl.c
> > +++ b/drivers/video/backlight/ep93xx_bl.c
> > @@ -38,8 +38,7 @@ static int ep93xxbl_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK ||
> > -	    bl->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return ep93xxbl_set(bl, brightness);
> > diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
> > index 75409ddfba3e..94b65e4d2aa0 100644
> > --- a/drivers/video/backlight/gpio_backlight.c
> > +++ b/drivers/video/backlight/gpio_backlight.c
> > @@ -25,9 +25,7 @@ static int gpio_backlight_get_next_brightness(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK ||
> > -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return brightness;
> > diff --git a/drivers/video/backlight/hp680_bl.c b/drivers/video/backlight/hp680_bl.c
> > index 8ea42b8d9bc8..01d805ca8415 100644
> > --- a/drivers/video/backlight/hp680_bl.c
> > +++ b/drivers/video/backlight/hp680_bl.c
> > @@ -35,9 +35,7 @@ static void hp680bl_send_intensity(struct backlight_device *bd)
> >  	u16 v;
> >  	int intensity = bd->props.brightness;
> >  
> > -	if (bd->props.power != FB_BLANK_UNBLANK)
> > -		intensity = 0;
> > -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bd))
> >  		intensity = 0;
> >  	if (hp680bl_suspended)
> >  		intensity = 0;
> > diff --git a/drivers/video/backlight/jornada720_bl.c b/drivers/video/backlight/jornada720_bl.c
> > index f0385f9cf9da..996f7ba3b373 100644
> > --- a/drivers/video/backlight/jornada720_bl.c
> > +++ b/drivers/video/backlight/jornada720_bl.c
> > @@ -54,7 +54,7 @@ static int jornada_bl_update_status(struct backlight_device *bd)
> >  	jornada_ssp_start();
> >  
> >  	/* If backlight is off then really turn it off */
> > -	if ((bd->props.power != FB_BLANK_UNBLANK) || (bd->props.fb_blank != FB_BLANK_UNBLANK)) {
> > +	if (backlight_is_blank(bd)) {
> >  		ret = jornada_ssp_byte(BRIGHTNESSOFF);
> >  		if (ret != TXDUMMY) {
> >  			dev_info(&bd->dev, "brightness off timeout\n");
> > diff --git a/drivers/video/backlight/kb3886_bl.c b/drivers/video/backlight/kb3886_bl.c
> > index 1dfe13c18925..a0fd5d3d82f5 100644
> > --- a/drivers/video/backlight/kb3886_bl.c
> > +++ b/drivers/video/backlight/kb3886_bl.c
> > @@ -89,9 +89,7 @@ static int kb3886bl_send_intensity(struct backlight_device *bd)
> >  {
> >  	int intensity = bd->props.brightness;
> >  
> > -	if (bd->props.power != FB_BLANK_UNBLANK)
> > -		intensity = 0;
> > -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bd))
> >  		intensity = 0;
> >  	if (kb3886bl_flags & KB3886BL_SUSPENDED)
> >  		intensity = 0;
> > diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c
> > index 3f66549997c8..c655ddd99cfb 100644
> > --- a/drivers/video/backlight/led_bl.c
> > +++ b/drivers/video/backlight/led_bl.c
> > @@ -56,9 +56,7 @@ static int led_bl_update_status(struct backlight_device *bl)
> >  	struct led_bl_data *priv = bl_get_data(bl);
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK ||
> > -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    bl->props.state & BL_CORE_FBBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	if (brightness > 0)
> > diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
> > index ee09d1bd02b9..476146b62c4e 100644
> > --- a/drivers/video/backlight/lm3533_bl.c
> > +++ b/drivers/video/backlight/lm3533_bl.c
> > @@ -41,9 +41,7 @@ static int lm3533_bl_update_status(struct backlight_device *bd)
> >  	struct lm3533_bl *bl = bl_get_data(bd);
> >  	int brightness = bd->props.brightness;
> >  
> > -	if (bd->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bd))
> >  		brightness = 0;
> >  
> >  	return lm3533_ctrlbank_set_brightness(&bl->cb, (u8)brightness);
> > diff --git a/drivers/video/backlight/locomolcd.c b/drivers/video/backlight/locomolcd.c
> > index cdc02e04f89d..8064cad8d683 100644
> > --- a/drivers/video/backlight/locomolcd.c
> > +++ b/drivers/video/backlight/locomolcd.c
> > @@ -113,9 +113,7 @@ static int locomolcd_set_intensity(struct backlight_device *bd)
> >  {
> >  	int intensity = bd->props.brightness;
> >  
> > -	if (bd->props.power != FB_BLANK_UNBLANK)
> > -		intensity = 0;
> > -	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
> > +	if (backlight_is_blank(bd))
> >  		intensity = 0;
> >  	if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
> >  		intensity = 0;
> > diff --git a/drivers/video/backlight/lv5207lp.c b/drivers/video/backlight/lv5207lp.c
> > index c6ad73a784e2..ef8aa9803577 100644
> > --- a/drivers/video/backlight/lv5207lp.c
> > +++ b/drivers/video/backlight/lv5207lp.c
> > @@ -48,9 +48,7 @@ static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
> >  	struct lv5207lp *lv = bl_get_data(backlight);
> >  	int brightness = backlight->props.brightness;
> >  
> > -	if (backlight->props.power != FB_BLANK_UNBLANK ||
> > -	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> > +	if (backlight_is_blank(backlight))
> >  		brightness = 0;
> >  
> >  	if (brightness) {
> > diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c
> > index 97cc260ff9d1..b8af2c6407d3 100644
> > --- a/drivers/video/backlight/max8925_bl.c
> > +++ b/drivers/video/backlight/max8925_bl.c
> > @@ -66,13 +66,7 @@ static int max8925_backlight_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.state & BL_CORE_SUSPENDED)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return max8925_backlight_set(bl, brightness);
> > diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
> > index 82b8d7594701..7d0ffcd37f07 100644
> > --- a/drivers/video/backlight/pwm_bl.c
> > +++ b/drivers/video/backlight/pwm_bl.c
> > @@ -111,9 +111,7 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
> >  	int brightness = bl->props.brightness;
> >  	struct pwm_state state;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK ||
> > -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    bl->props.state & BL_CORE_FBBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	if (pb->notify)
> > diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> > index 3d276b30a78c..9600f5d58ece 100644
> > --- a/drivers/video/backlight/qcom-wled.c
> > +++ b/drivers/video/backlight/qcom-wled.c
> > @@ -261,9 +261,7 @@ static int wled_update_status(struct backlight_device *bl)
> >  	u16 brightness = bl->props.brightness;
> >  	int rc = 0;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK ||
> > -	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
> > -	    bl->props.state & BL_CORE_FBBLANK)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	mutex_lock(&wled->lock);
> > diff --git a/drivers/video/backlight/tps65217_bl.c b/drivers/video/backlight/tps65217_bl.c
> > index 762e3feed097..1041e5e62ee3 100644
> > --- a/drivers/video/backlight/tps65217_bl.c
> > +++ b/drivers/video/backlight/tps65217_bl.c
> > @@ -82,9 +82,7 @@ static int tps65217_bl_update_status(struct backlight_device *bl)
> >  	if (bl->props.state & BL_CORE_SUSPENDED)
> >  		brightness = 0;
> >  
> > -	if ((bl->props.power != FB_BLANK_UNBLANK) ||
> > -		(bl->props.fb_blank != FB_BLANK_UNBLANK))
> > -		/* framebuffer in low power mode or blanking active */
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	if (brightness > 0) {
> > diff --git a/drivers/video/backlight/wm831x_bl.c b/drivers/video/backlight/wm831x_bl.c
> > index e55977d54c15..dc2ab6c8b7f9 100644
> > --- a/drivers/video/backlight/wm831x_bl.c
> > +++ b/drivers/video/backlight/wm831x_bl.c
> > @@ -93,13 +93,7 @@ static int wm831x_backlight_update_status(struct backlight_device *bl)
> >  {
> >  	int brightness = bl->props.brightness;
> >  
> > -	if (bl->props.power != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
> > -		brightness = 0;
> > -
> > -	if (bl->props.state & BL_CORE_SUSPENDED)
> > +	if (backlight_is_blank(bl))
> >  		brightness = 0;
> >  
> >  	return wm831x_backlight_set(bl, brightness);
> > 
> 
> - Péter
> 
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki


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Re: [PATCH v3 0/16] backlight updates

[Emil Velikov]

Hi Sam,

On Mon, 1 Jun 2020 at 07:52, Sam Ravnborg <sam@ravnborg.org> wrote:
>
> v3:
>  - Dropped video patch that was reviewd and thus applied
>  - Updated kernel-doc so all fields now have a short intro
>  - Improved readability in a lot of places, thanks to review
>    feedback from Daniel - thanks!
>  - Added better intro to backlight
>  - Added acks
>
>    Several other smaller changes documented in the
>    patches.
>    I left out patches to make functions static as
>    there are dependencies to drm-misc-next for these.
>    When this is landed I have a pile of follow-up patches waiting,
>    mostly introducing backlight_is_blank() all over.
>
What happened with my suggestion to use backlight_is_blank() in fbdev
core itself?
It effectively makes 13/13 and the above mentioned follow-up series obsolete.

That said, series look spot on. With the documentation fixed (pointer
by Daniel) patches 1-12 are:
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>

-Emil

Re: [PATCH v3 0/16] backlight updates

[Emil Velikov]

Hi Sam,

On Mon, 1 Jun 2020 at 07:52, Sam Ravnborg <sam@ravnborg.org> wrote:
>
> v3:
>  - Dropped video patch that was reviewd and thus applied
>  - Updated kernel-doc so all fields now have a short intro
>  - Improved readability in a lot of places, thanks to review
>    feedback from Daniel - thanks!
>  - Added better intro to backlight
>  - Added acks
>
>    Several other smaller changes documented in the
>    patches.
>    I left out patches to make functions static as
>    there are dependencies to drm-misc-next for these.
>    When this is landed I have a pile of follow-up patches waiting,
>    mostly introducing backlight_is_blank() all over.
>
What happened with my suggestion to use backlight_is_blank() in fbdev
core itself?
It effectively makes 13/13 and the above mentioned follow-up series obsolete.

That said, series look spot on. With the documentation fixed (pointer
by Daniel) patches 1-12 are:
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>

-Emil

Re: [PATCH v3 0/16] backlight updates

[Emil Velikov]

Hi Sam,

On Mon, 1 Jun 2020 at 07:52, Sam Ravnborg <sam@ravnborg.org> wrote:
>
> v3:
>  - Dropped video patch that was reviewd and thus applied
>  - Updated kernel-doc so all fields now have a short intro
>  - Improved readability in a lot of places, thanks to review
>    feedback from Daniel - thanks!
>  - Added better intro to backlight
>  - Added acks
>
>    Several other smaller changes documented in the
>    patches.
>    I left out patches to make functions static as
>    there are dependencies to drm-misc-next for these.
>    When this is landed I have a pile of follow-up patches waiting,
>    mostly introducing backlight_is_blank() all over.
>
What happened with my suggestion to use backlight_is_blank() in fbdev
core itself?
It effectively makes 13/13 and the above mentioned follow-up series obsolete.

That said, series look spot on. With the documentation fixed (pointer
by Daniel) patches 1-12 are:
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>

-Emil
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH v3 0/16] backlight updates

[Sam Ravnborg]

Hi Emil.

Long overdue feedback, I did not find time to go back to this patch-set
until now.

On Tue, Jun 02, 2020 at 03:04:39PM +0100, Emil Velikov wrote:
> Hi Sam,
> 
> On Mon, 1 Jun 2020 at 07:52, Sam Ravnborg <sam@ravnborg.org> wrote:
> >
> > v3:
> >  - Dropped video patch that was reviewd and thus applied
> >  - Updated kernel-doc so all fields now have a short intro
> >  - Improved readability in a lot of places, thanks to review
> >    feedback from Daniel - thanks!
> >  - Added better intro to backlight
> >  - Added acks
> >
> >    Several other smaller changes documented in the
> >    patches.
> >    I left out patches to make functions static as
> >    there are dependencies to drm-misc-next for these.
> >    When this is landed I have a pile of follow-up patches waiting,
> >    mostly introducing backlight_is_blank() all over.
> >
> What happened with my suggestion to use backlight_is_blank() in fbdev
> core itself?
Following your suggestion I implemented:

+static inline int backlight_get_brightness(struct backlight_device *bd)
+{
+	if (backlight_is_blank(bd))
+		return 0;
+	else
+		return bd->props.brightness;
+}

This results in code like this:

static int adp8870_bl_update_status(struct backlight_device *bl)
{
        return adp8870_bl_set(bl, backlight_get_brightness(bl));
}

Compare that with the original code:
static int adp8870_bl_update_status(struct backlight_device *bl)
{
	int brightness = bl->props.brightness;

	if (bl->props.power != FB_BLANK_UNBLANK)
		brightness = 0;

	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
		brightness = 0;

	return adp8870_bl_set(bl, brightness);
}

Much nicer!

The old code reads the brightness property direct.
I prefer the small helper so we do not hardcode too much of the
internals in the drivers.
Also the above is simpler than trying to maintain the correct value in
props.brightness all the time. And can be introduced gradually.

I will rework the series to use this helper.
I will also fix so I can use a const backlight_device *.

Thanks for the suggestion.

	Sam


> It effectively makes 13/13 and the above mentioned follow-up series obsolete.
> 
> That said, series look spot on. With the documentation fixed (pointer
> by Daniel) patches 1-12 are:
> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
> 
> -Emil
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH v3 0/16] backlight updates

[Sam Ravnborg]

Hi Emil.

Long overdue feedback, I did not find time to go back to this patch-set
until now.

On Tue, Jun 02, 2020 at 03:04:39PM +0100, Emil Velikov wrote:
> Hi Sam,
> 
> On Mon, 1 Jun 2020 at 07:52, Sam Ravnborg <sam@ravnborg.org> wrote:
> >
> > v3:
> >  - Dropped video patch that was reviewd and thus applied
> >  - Updated kernel-doc so all fields now have a short intro
> >  - Improved readability in a lot of places, thanks to review
> >    feedback from Daniel - thanks!
> >  - Added better intro to backlight
> >  - Added acks
> >
> >    Several other smaller changes documented in the
> >    patches.
> >    I left out patches to make functions static as
> >    there are dependencies to drm-misc-next for these.
> >    When this is landed I have a pile of follow-up patches waiting,
> >    mostly introducing backlight_is_blank() all over.
> >
> What happened with my suggestion to use backlight_is_blank() in fbdev
> core itself?
Following your suggestion I implemented:

+static inline int backlight_get_brightness(struct backlight_device *bd)
+{
+	if (backlight_is_blank(bd))
+		return 0;
+	else
+		return bd->props.brightness;
+}

This results in code like this:

static int adp8870_bl_update_status(struct backlight_device *bl)
{
        return adp8870_bl_set(bl, backlight_get_brightness(bl));
}

Compare that with the original code:
static int adp8870_bl_update_status(struct backlight_device *bl)
{
	int brightness = bl->props.brightness;

	if (bl->props.power != FB_BLANK_UNBLANK)
		brightness = 0;

	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
		brightness = 0;

	return adp8870_bl_set(bl, brightness);
}

Much nicer!

The old code reads the brightness property direct.
I prefer the small helper so we do not hardcode too much of the
internals in the drivers.
Also the above is simpler than trying to maintain the correct value in
props.brightness all the time. And can be introduced gradually.

I will rework the series to use this helper.
I will also fix so I can use a const backlight_device *.

Thanks for the suggestion.

	Sam


> It effectively makes 13/13 and the above mentioned follow-up series obsolete.
> 
> That said, series look spot on. With the documentation fixed (pointer
> by Daniel) patches 1-12 are:
> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
> 
> -Emil
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH v3 0/16] backlight updates

[Sam Ravnborg]

Hi Emil.

Long overdue feedback, I did not find time to go back to this patch-set
until now.

On Tue, Jun 02, 2020 at 03:04:39PM +0100, Emil Velikov wrote:
> Hi Sam,
> 
> On Mon, 1 Jun 2020 at 07:52, Sam Ravnborg <sam@ravnborg.org> wrote:
> >
> > v3:
> >  - Dropped video patch that was reviewd and thus applied
> >  - Updated kernel-doc so all fields now have a short intro
> >  - Improved readability in a lot of places, thanks to review
> >    feedback from Daniel - thanks!
> >  - Added better intro to backlight
> >  - Added acks
> >
> >    Several other smaller changes documented in the
> >    patches.
> >    I left out patches to make functions static as
> >    there are dependencies to drm-misc-next for these.
> >    When this is landed I have a pile of follow-up patches waiting,
> >    mostly introducing backlight_is_blank() all over.
> >
> What happened with my suggestion to use backlight_is_blank() in fbdev
> core itself?
Following your suggestion I implemented:

+static inline int backlight_get_brightness(struct backlight_device *bd)
+{
+	if (backlight_is_blank(bd))
+		return 0;
+	else
+		return bd->props.brightness;
+}

This results in code like this:

static int adp8870_bl_update_status(struct backlight_device *bl)
{
        return adp8870_bl_set(bl, backlight_get_brightness(bl));
}

Compare that with the original code:
static int adp8870_bl_update_status(struct backlight_device *bl)
{
	int brightness = bl->props.brightness;

	if (bl->props.power != FB_BLANK_UNBLANK)
		brightness = 0;

	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
		brightness = 0;

	return adp8870_bl_set(bl, brightness);
}

Much nicer!

The old code reads the brightness property direct.
I prefer the small helper so we do not hardcode too much of the
internals in the drivers.
Also the above is simpler than trying to maintain the correct value in
props.brightness all the time. And can be introduced gradually.

I will rework the series to use this helper.
I will also fix so I can use a const backlight_device *.

Thanks for the suggestion.

	Sam


> It effectively makes 13/13 and the above mentioned follow-up series obsolete.
> 
> That said, series look spot on. With the documentation fixed (pointer
> by Daniel) patches 1-12 are:
> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
> 
> -Emil
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel