* [PATCH v5 1/2] devicetree: i2c-hid: Add regulator support
@ 2017-02-10 2:03 ` Brian Norris
0 siblings, 0 replies; 5+ messages in thread
From: Brian Norris @ 2017-02-10 2:03 UTC (permalink / raw)
To: Jiri Kosina, Benjamin Tissoires
Cc: Caesar Wang, linux-rockchip, Rob Herring, linux-input,
devicetree, linux-kernel, Dmitry Torokhov, Mark Rutland,
Doug Anderson, Brian Norris
From: Caesar Wang <wxt@rock-chips.com>
Document a "vdd-supply" and an initialization delay. Can be used for
powering on/off a HID.
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: linux-input@vger.kernel.org
Signed-off-by: Brian Norris <briannorris@chromium.org>
---
Sorry for the delay on resending this. I *think* I've addressed all the
concerns from last time though?
v2:
* add compatible property for wacom, per Rob's request
* name the regulator property specifically (VDD)
v3:
* remove wacom property, per Benjamin's request
* add delay property
v4: no change
v5:
* change name to "post-power-on-delay-ms"
* reword to describe how the power sequencing properties require a
specific 'compatible' property
---
Documentation/devicetree/bindings/input/hid-over-i2c.txt | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/Documentation/devicetree/bindings/input/hid-over-i2c.txt b/Documentation/devicetree/bindings/input/hid-over-i2c.txt
index 488edcb264c4..28e8bd8b7d64 100644
--- a/Documentation/devicetree/bindings/input/hid-over-i2c.txt
+++ b/Documentation/devicetree/bindings/input/hid-over-i2c.txt
@@ -17,6 +17,22 @@ Required properties:
- interrupt-parent: the phandle for the interrupt controller
- interrupts: interrupt line
+Additional optional properties:
+
+Some devices may support additional optional properties to help with, e.g.,
+power sequencing. The following properties can be supported by one or more
+device-specific compatible properties, which should be used in addition to the
+"hid-over-i2c" string.
+
+- compatible:
+ * "wacom,w9013" (Wacom W9013 digitizer). Supports:
+ - vdd-supply
+ - post-power-on-delay-ms
+
+- vdd-supply: phandle of the regulator that provides the supply voltage.
+- post-power-on-delay-ms: time required by the device after enabling its regulators
+ before it is ready for communication. Must be used with 'vdd-supply'.
+
Example:
i2c-hid-dev@2c {
--
2.11.0.483.g087da7b7c-goog
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v5 1/2] devicetree: i2c-hid: Add regulator support
@ 2017-02-10 2:03 ` Brian Norris
0 siblings, 0 replies; 5+ messages in thread
From: Brian Norris @ 2017-02-10 2:03 UTC (permalink / raw)
To: Jiri Kosina, Benjamin Tissoires
Cc: Caesar Wang, linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
Rob Herring, linux-input-u79uwXL29TY76Z2rM5mHXA,
devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA, Dmitry Torokhov,
Mark Rutland, Doug Anderson, Brian Norris
From: Caesar Wang <wxt-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
Document a "vdd-supply" and an initialization delay. Can be used for
powering on/off a HID.
Signed-off-by: Caesar Wang <wxt-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
Cc: Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Jiri Kosina <jikos-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Signed-off-by: Brian Norris <briannorris-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
---
Sorry for the delay on resending this. I *think* I've addressed all the
concerns from last time though?
v2:
* add compatible property for wacom, per Rob's request
* name the regulator property specifically (VDD)
v3:
* remove wacom property, per Benjamin's request
* add delay property
v4: no change
v5:
* change name to "post-power-on-delay-ms"
* reword to describe how the power sequencing properties require a
specific 'compatible' property
---
Documentation/devicetree/bindings/input/hid-over-i2c.txt | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/Documentation/devicetree/bindings/input/hid-over-i2c.txt b/Documentation/devicetree/bindings/input/hid-over-i2c.txt
index 488edcb264c4..28e8bd8b7d64 100644
--- a/Documentation/devicetree/bindings/input/hid-over-i2c.txt
+++ b/Documentation/devicetree/bindings/input/hid-over-i2c.txt
@@ -17,6 +17,22 @@ Required properties:
- interrupt-parent: the phandle for the interrupt controller
- interrupts: interrupt line
+Additional optional properties:
+
+Some devices may support additional optional properties to help with, e.g.,
+power sequencing. The following properties can be supported by one or more
+device-specific compatible properties, which should be used in addition to the
+"hid-over-i2c" string.
+
+- compatible:
+ * "wacom,w9013" (Wacom W9013 digitizer). Supports:
+ - vdd-supply
+ - post-power-on-delay-ms
+
+- vdd-supply: phandle of the regulator that provides the supply voltage.
+- post-power-on-delay-ms: time required by the device after enabling its regulators
+ before it is ready for communication. Must be used with 'vdd-supply'.
+
Example:
i2c-hid-dev@2c {
--
2.11.0.483.g087da7b7c-goog
--
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^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v5 2/2] HID: i2c-hid: support regulator power on/off
2017-02-10 2:03 ` Brian Norris
(?)
@ 2017-02-10 2:03 ` Brian Norris
-1 siblings, 0 replies; 5+ messages in thread
From: Brian Norris @ 2017-02-10 2:03 UTC (permalink / raw)
To: Jiri Kosina, Benjamin Tissoires
Cc: Caesar Wang, linux-rockchip, Rob Herring, linux-input,
devicetree, linux-kernel, Dmitry Torokhov, Mark Rutland,
Doug Anderson, Brian Norris
On some boards, we need to enable a regulator before using the HID, and
it's also nice to save power in suspend by disabling it. Support an
optional "vdd-supply" and a companion initialization delay.
Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: linux-input@vger.kernel.org
---
v2:
* support compatible property for wacom, with specific "vdd-supply"
* name
* support the 100ms delay needed for this digitizer
* target regulator support only at specific device
v3:
* drop Wacom specifics and allow this to be used generically
* add "init-delay-ms" property support
v4:
* use devm_regulator_get() (with a 'dummy' regulator for most cases)
instead of _optional() version, to make code less conditional (Dmitry)
* fix but where 'init_delay_ms' wasn't getting assigned properly
* disable regulator in probe() failure path
v5:
* rebase
* use 'post-power-on-delay-ms' name
---
drivers/hid/i2c-hid/i2c-hid.c | 42 ++++++++++++++++++++++++++++++++++++++++--
include/linux/i2c/i2c-hid.h | 6 ++++++
2 files changed, 46 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index ea3c3546cef7..a3f6daf0886b 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -994,6 +994,11 @@ static int i2c_hid_of_probe(struct i2c_client *client,
}
pdata->hid_descriptor_address = val;
+ ret = of_property_read_u32(dev->of_node, "post-power-on-delay-ms",
+ &val);
+ if (!ret)
+ pdata->post_power_delay_ms = val;
+
return 0;
}
@@ -1053,6 +1058,24 @@ static int i2c_hid_probe(struct i2c_client *client,
ihid->pdata = *platform_data;
}
+ ihid->pdata.supply = devm_regulator_get(&client->dev, "vdd");
+ if (IS_ERR(ihid->pdata.supply)) {
+ ret = PTR_ERR(ihid->pdata.supply);
+ if (ret != -EPROBE_DEFER)
+ dev_err(&client->dev, "Failed to get regulator: %d\n",
+ ret);
+ return ret;
+ }
+
+ ret = regulator_enable(ihid->pdata.supply);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to enable regulator: %d\n",
+ ret);
+ goto err;
+ }
+ if (ihid->pdata.post_power_delay_ms)
+ msleep(ihid->pdata.post_power_delay_ms);
+
i2c_set_clientdata(client, ihid);
ihid->client = client;
@@ -1068,7 +1091,7 @@ static int i2c_hid_probe(struct i2c_client *client,
* real computation later. */
ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
if (ret < 0)
- goto err;
+ goto err_regulator;
pm_runtime_get_noresume(&client->dev);
pm_runtime_set_active(&client->dev);
@@ -1125,6 +1148,9 @@ static int i2c_hid_probe(struct i2c_client *client,
pm_runtime_put_noidle(&client->dev);
pm_runtime_disable(&client->dev);
+err_regulator:
+ regulator_disable(ihid->pdata.supply);
+
err:
i2c_hid_free_buffers(ihid);
kfree(ihid);
@@ -1149,6 +1175,8 @@ static int i2c_hid_remove(struct i2c_client *client)
if (ihid->bufsize)
i2c_hid_free_buffers(ihid);
+ regulator_disable(ihid->pdata.supply);
+
kfree(ihid);
return 0;
@@ -1199,6 +1227,10 @@ static int i2c_hid_suspend(struct device *dev)
else
hid_warn(hid, "Failed to enable irq wake: %d\n",
wake_status);
+ } else {
+ ret = regulator_disable(ihid->pdata.supply);
+ if (ret < 0)
+ hid_warn(hid, "Failed to disable supply: %d\n", ret);
}
return 0;
@@ -1212,7 +1244,13 @@ static int i2c_hid_resume(struct device *dev)
struct hid_device *hid = ihid->hid;
int wake_status;
- if (device_may_wakeup(&client->dev) && ihid->irq_wake_enabled) {
+ if (!device_may_wakeup(&client->dev)) {
+ ret = regulator_enable(ihid->pdata.supply);
+ if (ret < 0)
+ hid_warn(hid, "Failed to enable supply: %d\n", ret);
+ if (ihid->pdata.post_power_delay_ms)
+ msleep(ihid->pdata.post_power_delay_ms);
+ } else if (ihid->irq_wake_enabled) {
wake_status = disable_irq_wake(client->irq);
if (!wake_status)
ihid->irq_wake_enabled = false;
diff --git a/include/linux/i2c/i2c-hid.h b/include/linux/i2c/i2c-hid.h
index 7aa901d92058..1fb088239d12 100644
--- a/include/linux/i2c/i2c-hid.h
+++ b/include/linux/i2c/i2c-hid.h
@@ -14,9 +14,13 @@
#include <linux/types.h>
+struct regulator;
+
/**
* struct i2chid_platform_data - used by hid over i2c implementation.
* @hid_descriptor_address: i2c register where the HID descriptor is stored.
+ * @supply: regulator for powering on the device.
+ * @post_power_delay_ms: delay after powering on before device is usable.
*
* Note that it is the responsibility of the platform driver (or the acpi 5.0
* driver, or the flattened device tree) to setup the irq related to the gpio in
@@ -31,6 +35,8 @@
*/
struct i2c_hid_platform_data {
u16 hid_descriptor_address;
+ struct regulator *supply;
+ int post_power_delay_ms;
};
#endif /* __LINUX_I2C_HID_H */
--
2.11.0.483.g087da7b7c-goog
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v5 1/2] devicetree: i2c-hid: Add regulator support
2017-02-10 2:03 ` Brian Norris
(?)
(?)
@ 2017-02-16 2:12 ` Rob Herring
-1 siblings, 0 replies; 5+ messages in thread
From: Rob Herring @ 2017-02-16 2:12 UTC (permalink / raw)
To: Brian Norris
Cc: Jiri Kosina, Benjamin Tissoires, Caesar Wang, linux-rockchip,
linux-input, devicetree, linux-kernel, Dmitry Torokhov,
Mark Rutland, Doug Anderson
On Thu, Feb 09, 2017 at 06:03:56PM -0800, Brian Norris wrote:
> From: Caesar Wang <wxt@rock-chips.com>
>
> Document a "vdd-supply" and an initialization delay. Can be used for
> powering on/off a HID.
>
> Signed-off-by: Caesar Wang <wxt@rock-chips.com>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Jiri Kosina <jikos@kernel.org>
> Cc: linux-input@vger.kernel.org
> Signed-off-by: Brian Norris <briannorris@chromium.org>
> ---
> Sorry for the delay on resending this. I *think* I've addressed all the
> concerns from last time though?
>
> v2:
> * add compatible property for wacom, per Rob's request
> * name the regulator property specifically (VDD)
>
> v3:
> * remove wacom property, per Benjamin's request
> * add delay property
>
> v4: no change
>
> v5:
> * change name to "post-power-on-delay-ms"
> * reword to describe how the power sequencing properties require a
> specific 'compatible' property
> ---
> Documentation/devicetree/bindings/input/hid-over-i2c.txt | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
Acked-by: Rob Herring <robh@kernel.org>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v5 1/2] devicetree: i2c-hid: Add regulator support
2017-02-10 2:03 ` Brian Norris
` (2 preceding siblings ...)
(?)
@ 2017-03-06 12:50 ` Jiri Kosina
-1 siblings, 0 replies; 5+ messages in thread
From: Jiri Kosina @ 2017-03-06 12:50 UTC (permalink / raw)
To: Brian Norris
Cc: Benjamin Tissoires, Caesar Wang, linux-rockchip, Rob Herring,
linux-input, devicetree, linux-kernel, Dmitry Torokhov,
Mark Rutland, Doug Anderson
On Thu, 9 Feb 2017, Brian Norris wrote:
> From: Caesar Wang <wxt@rock-chips.com>
>
> Document a "vdd-supply" and an initialization delay. Can be used for
> powering on/off a HID.
>
> Signed-off-by: Caesar Wang <wxt@rock-chips.com>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Jiri Kosina <jikos@kernel.org>
> Cc: linux-input@vger.kernel.org
> Signed-off-by: Brian Norris <briannorris@chromium.org>
> ---
> Sorry for the delay on resending this. I *think* I've addressed all the
> concerns from last time though?
Both patches applied to for-4.12/i2c-hid. Thanks,
--
Jiri Kosina
SUSE Labs
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2017-03-06 12:50 UTC | newest]
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2017-02-10 2:03 [PATCH v5 1/2] devicetree: i2c-hid: Add regulator support Brian Norris
2017-02-10 2:03 ` Brian Norris
2017-02-10 2:03 ` [PATCH v5 2/2] HID: i2c-hid: support regulator power on/off Brian Norris
2017-02-16 2:12 ` [PATCH v5 1/2] devicetree: i2c-hid: Add regulator support Rob Herring
2017-03-06 12:50 ` Jiri Kosina
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