[PATCH v2 0/7] leds: Support retaining state for the PCA955x

[PATCH v2 0/7] leds: Support retaining state for the PCA955x

[Eddie James]

This series implements the ability to retain the state of the LEDs
controlled by the PCA955x across system reboots. This includes a
change to the LED core driver to respect the retain-state-shutdown
device tree property. It also cleans up the PCA955x driver, adds the
ability to query the hardware LED brightness, switches the I2C probe
function to probe_new, and uses more core functionality for parsing
the fwnode.

Eddie James (7):
  dt-bindings: leds: Add retain-state-shutdown boolean
  leds: leds-core: Implement the retain-state-shutdown property
  leds: pca955x: Clean up code formatting
  leds: pca955x: Add brightness_get function
  leds: pca955x: Implement the default-state property
  leds: pca955x: Let the core process the fwnode
  leds: pca955x: Switch to i2c probe_new

 .../devicetree/bindings/leds/common.yaml      |   6 +
 drivers/leds/led-class.c                      |  10 +-
 drivers/leds/leds-pca955x.c                   | 232 +++++++++++++-----
 3 files changed, 182 insertions(+), 66 deletions(-)

-- 
2.27.0

[PATCH v2 1/7] dt-bindings: leds: Add retain-state-shutdown boolean

[Eddie James]

Document the retain-state-shutdown property that indicates that a LED
should not be turned off or changed during system shutdown.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Acked-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/leds/common.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/leds/common.yaml b/Documentation/devicetree/bindings/leds/common.yaml
index b1f363747a62..697102707703 100644
--- a/Documentation/devicetree/bindings/leds/common.yaml
+++ b/Documentation/devicetree/bindings/leds/common.yaml
@@ -128,6 +128,12 @@ properties:
       as a panic indicator.
     type: boolean
 
+  retain-state-shutdown:
+    description:
+      This property specifies that the LED should not be turned off or changed
+      when the system shuts down.
+    type: boolean
+
   trigger-sources:
     description: |
       List of devices which should be used as a source triggering this LED
-- 
2.27.0

[PATCH v2 2/7] leds: leds-core: Implement the retain-state-shutdown property

[Eddie James]

Read the retain-state-shutdown device tree property to set the
existing LED_RETAIN_AT_SHUTDOWN flag. Then check the flag when
unregistering, and if set, don't set the brightness to OFF. This
is useful for systems that want to keep the HW state of the LED
across reboots.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/leds/led-class.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index f704391d57a8..f4bb02f6e042 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -350,10 +350,15 @@ int led_classdev_register_ext(struct device *parent,
 		if (ret < 0)
 			return ret;
 
-		if (init_data->fwnode)
+		if (init_data->fwnode) {
 			fwnode_property_read_string(init_data->fwnode,
 				"linux,default-trigger",
 				&led_cdev->default_trigger);
+
+			if (fwnode_property_present(init_data->fwnode,
+						    "retain-state-shutdown"))
+				led_cdev->flags |= LED_RETAIN_AT_SHUTDOWN;
+		}
 	} else {
 		proposed_name = led_cdev->name;
 	}
@@ -444,7 +449,8 @@ void led_classdev_unregister(struct led_classdev *led_cdev)
 	/* Stop blinking */
 	led_stop_software_blink(led_cdev);
 
-	led_set_brightness(led_cdev, LED_OFF);
+	if (!(led_cdev->flags & LED_RETAIN_AT_SHUTDOWN))
+		led_set_brightness(led_cdev, LED_OFF);
 
 	flush_work(&led_cdev->set_brightness_work);
 
-- 
2.27.0

[PATCH v2 3/7] leds: pca955x: Clean up code formatting

[Eddie James]

Format the code. Add some variables to help shorten lines.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/leds/leds-pca955x.c | 63 ++++++++++++++++++-------------------
 1 file changed, 30 insertions(+), 33 deletions(-)

diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c
index 7087ca4592fc..f0d841cb59fc 100644
--- a/drivers/leds/leds-pca955x.c
+++ b/drivers/leds/leds-pca955x.c
@@ -166,11 +166,10 @@ static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state)
 static int pca955x_write_psc(struct i2c_client *client, int n, u8 val)
 {
 	struct pca955x *pca955x = i2c_get_clientdata(client);
+	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + (2 * n);
 	int ret;
 
-	ret = i2c_smbus_write_byte_data(client,
-		pca95xx_num_input_regs(pca955x->chipdef->bits) + 2*n,
-		val);
+	ret = i2c_smbus_write_byte_data(client, cmd, val);
 	if (ret < 0)
 		dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
 			__func__, n, val, ret);
@@ -187,11 +186,10 @@ static int pca955x_write_psc(struct i2c_client *client, int n, u8 val)
 static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
 {
 	struct pca955x *pca955x = i2c_get_clientdata(client);
+	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
 	int ret;
 
-	ret = i2c_smbus_write_byte_data(client,
-		pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + 2*n,
-		val);
+	ret = i2c_smbus_write_byte_data(client, cmd, val);
 	if (ret < 0)
 		dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
 			__func__, n, val, ret);
@@ -205,11 +203,10 @@ static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
 static int pca955x_write_ls(struct i2c_client *client, int n, u8 val)
 {
 	struct pca955x *pca955x = i2c_get_clientdata(client);
+	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n;
 	int ret;
 
-	ret = i2c_smbus_write_byte_data(client,
-		pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n,
-		val);
+	ret = i2c_smbus_write_byte_data(client, cmd, val);
 	if (ret < 0)
 		dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
 			__func__, n, val, ret);
@@ -223,10 +220,10 @@ static int pca955x_write_ls(struct i2c_client *client, int n, u8 val)
 static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val)
 {
 	struct pca955x *pca955x = i2c_get_clientdata(client);
+	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n;
 	int ret;
 
-	ret = i2c_smbus_read_byte_data(client,
-		pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n);
+	ret = i2c_smbus_read_byte_data(client, cmd);
 	if (ret < 0) {
 		dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
 			__func__, n, ret);
@@ -371,6 +368,7 @@ static struct pca955x_platform_data *
 pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip)
 {
 	struct pca955x_platform_data *pdata;
+	struct pca955x_led *led;
 	struct fwnode_handle *child;
 	int count;
 
@@ -401,13 +399,13 @@ pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip)
 		if ((res != 0) && is_of_node(child))
 			name = to_of_node(child)->name;
 
-		snprintf(pdata->leds[reg].name, sizeof(pdata->leds[reg].name),
-			 "%s", name);
+		led = &pdata->leds[reg];
+		snprintf(led->name, sizeof(led->name), "%s", name);
 
-		pdata->leds[reg].type = PCA955X_TYPE_LED;
-		fwnode_property_read_u32(child, "type", &pdata->leds[reg].type);
+		led->type = PCA955X_TYPE_LED;
+		fwnode_property_read_u32(child, "type", &led->type);
 		fwnode_property_read_string(child, "linux,default-trigger",
-					&pdata->leds[reg].default_trigger);
+					    &led->default_trigger);
 	}
 
 	pdata->num_leds = chip->bits;
@@ -426,11 +424,12 @@ static const struct of_device_id of_pca955x_match[] = {
 MODULE_DEVICE_TABLE(of, of_pca955x_match);
 
 static int pca955x_probe(struct i2c_client *client,
-					const struct i2c_device_id *id)
+			 const struct i2c_device_id *id)
 {
 	struct pca955x *pca955x;
 	struct pca955x_led *pca955x_led;
 	struct pca955x_chipdef *chip;
+	struct led_classdev *led;
 	struct i2c_adapter *adapter;
 	int i, err;
 	struct pca955x_platform_data *pdata;
@@ -449,13 +448,13 @@ static int pca955x_probe(struct i2c_client *client,
 	if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) !=
 	    chip->slv_addr) {
 		dev_err(&client->dev, "invalid slave address %02x\n",
-				client->addr);
+			client->addr);
 		return -ENODEV;
 	}
 
 	dev_info(&client->dev, "leds-pca955x: Using %s %d-bit LED driver at "
-			"slave address 0x%02x\n",
-			client->name, chip->bits, client->addr);
+		 "slave address 0x%02x\n", client->name, chip->bits,
+		 client->addr);
 
 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 		return -EIO;
@@ -471,8 +470,8 @@ static int pca955x_probe(struct i2c_client *client,
 	if (!pca955x)
 		return -ENOMEM;
 
-	pca955x->leds = devm_kcalloc(&client->dev,
-			chip->bits, sizeof(*pca955x_led), GFP_KERNEL);
+	pca955x->leds = devm_kcalloc(&client->dev, chip->bits,
+				     sizeof(*pca955x_led), GFP_KERNEL);
 	if (!pca955x->leds)
 		return -ENOMEM;
 
@@ -501,27 +500,25 @@ static int pca955x_probe(struct i2c_client *client,
 			 */
 			if (pdata->leds[i].name[0] == '\0')
 				snprintf(pdata->leds[i].name,
-					sizeof(pdata->leds[i].name), "%d", i);
+					 sizeof(pdata->leds[i].name), "%d", i);
 
-			snprintf(pca955x_led->name,
-				sizeof(pca955x_led->name), "pca955x:%s",
-				pdata->leds[i].name);
+			snprintf(pca955x_led->name, sizeof(pca955x_led->name),
+				 "pca955x:%s", pdata->leds[i].name);
 
+			led = &pca955x_led->led_cdev;
 			if (pdata->leds[i].default_trigger)
-				pca955x_led->led_cdev.default_trigger =
+				led->default_trigger =
 					pdata->leds[i].default_trigger;
 
-			pca955x_led->led_cdev.name = pca955x_led->name;
-			pca955x_led->led_cdev.brightness_set_blocking =
-				pca955x_led_set;
+			led->name = pca955x_led->name;
+			led->brightness_set_blocking = pca955x_led_set;
 
-			err = devm_led_classdev_register(&client->dev,
-							&pca955x_led->led_cdev);
+			err = devm_led_classdev_register(&client->dev, led);
 			if (err)
 				return err;
 
 			/* Turn off LED */
-			err = pca955x_led_set(&pca955x_led->led_cdev, LED_OFF);
+			err = pca955x_led_set(led, LED_OFF);
 			if (err)
 				return err;
 		}
-- 
2.27.0

[PATCH v2 4/7] leds: pca955x: Add brightness_get function

[Eddie James]

Add a function to fetch the state of the hardware LED.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/leds/leds-pca955x.c | 52 +++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c
index f0d841cb59fc..e47ba7c3b7c7 100644
--- a/drivers/leds/leds-pca955x.c
+++ b/drivers/leds/leds-pca955x.c
@@ -233,6 +233,57 @@ static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val)
 	return 0;
 }
 
+static int pca955x_read_pwm(struct i2c_client *client, int n, u8 *val)
+{
+	struct pca955x *pca955x = i2c_get_clientdata(client);
+	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
+	int ret;
+
+	ret = i2c_smbus_read_byte_data(client, cmd);
+	if (ret < 0) {
+		dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
+			__func__, n, ret);
+		return ret;
+	}
+	*val = (u8)ret;
+	return 0;
+}
+
+static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev)
+{
+	struct pca955x_led *pca955x_led = container_of(led_cdev,
+						       struct pca955x_led,
+						       led_cdev);
+	struct pca955x *pca955x = pca955x_led->pca955x;
+	u8 ls, pwm;
+	int ret;
+
+	ret = pca955x_read_ls(pca955x->client, pca955x_led->led_num / 4, &ls);
+	if (ret)
+		return ret;
+
+	ls = (ls >> ((pca955x_led->led_num % 4) << 1)) & 0x3;
+	switch (ls) {
+	case PCA955X_LS_LED_ON:
+		ret = LED_FULL;
+		break;
+	case PCA955X_LS_LED_OFF:
+		ret = LED_OFF;
+		break;
+	case PCA955X_LS_BLINK0:
+		ret = LED_HALF;
+		break;
+	case PCA955X_LS_BLINK1:
+		ret = pca955x_read_pwm(pca955x->client, 1, &pwm);
+		if (ret)
+			return ret;
+		ret = 255 - pwm;
+		break;
+	}
+
+	return ret;
+}
+
 static int pca955x_led_set(struct led_classdev *led_cdev,
 			    enum led_brightness value)
 {
@@ -512,6 +563,7 @@ static int pca955x_probe(struct i2c_client *client,
 
 			led->name = pca955x_led->name;
 			led->brightness_set_blocking = pca955x_led_set;
+			led->brightness_get = pca955x_led_get;
 
 			err = devm_led_classdev_register(&client->dev, led);
 			if (err)
-- 
2.27.0

[PATCH v2 5/7] leds: pca955x: Implement the default-state property

[Eddie James]

In order to retain the LED state after a system reboot, check the
documented default-state device tree property during initialization.
Modify the behavior of the probe according to the property.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/leds/leds-pca955x.c | 54 +++++++++++++++++++++++++++++++------
 1 file changed, 46 insertions(+), 8 deletions(-)

diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c
index e47ba7c3b7c7..fa1d77d86ef6 100644
--- a/drivers/leds/leds-pca955x.c
+++ b/drivers/leds/leds-pca955x.c
@@ -129,6 +129,7 @@ struct pca955x_led {
 	int			led_num;	/* 0 .. 15 potentially */
 	char			name[32];
 	u32			type;
+	int			default_state;
 	const char		*default_trigger;
 };
 
@@ -439,6 +440,7 @@ pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip)
 
 	device_for_each_child_node(&client->dev, child) {
 		const char *name;
+		const char *state;
 		u32 reg;
 		int res;
 
@@ -457,6 +459,18 @@ pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip)
 		fwnode_property_read_u32(child, "type", &led->type);
 		fwnode_property_read_string(child, "linux,default-trigger",
 					    &led->default_trigger);
+
+		if (!fwnode_property_read_string(child, "default-state",
+						 &state)) {
+			if (!strcmp(state, "keep"))
+				led->default_state = LEDS_GPIO_DEFSTATE_KEEP;
+			else if (!strcmp(state, "on"))
+				led->default_state = LEDS_GPIO_DEFSTATE_ON;
+			else
+				led->default_state = LEDS_GPIO_DEFSTATE_OFF;
+		} else {
+			led->default_state = LEDS_GPIO_DEFSTATE_OFF;
+		}
 	}
 
 	pdata->num_leds = chip->bits;
@@ -485,6 +499,7 @@ static int pca955x_probe(struct i2c_client *client,
 	int i, err;
 	struct pca955x_platform_data *pdata;
 	int ngpios = 0;
+	bool keep_pwm = false;
 
 	chip = &pca955x_chipdefs[id->driver_data];
 	adapter = client->adapter;
@@ -565,14 +580,35 @@ static int pca955x_probe(struct i2c_client *client,
 			led->brightness_set_blocking = pca955x_led_set;
 			led->brightness_get = pca955x_led_get;
 
+			if (pdata->leds[i].default_state ==
+			    LEDS_GPIO_DEFSTATE_OFF) {
+				err = pca955x_led_set(led, LED_OFF);
+				if (err)
+					return err;
+			} else if (pdata->leds[i].default_state ==
+				   LEDS_GPIO_DEFSTATE_ON) {
+				err = pca955x_led_set(led, LED_FULL);
+				if (err)
+					return err;
+			}
+
 			err = devm_led_classdev_register(&client->dev, led);
 			if (err)
 				return err;
 
-			/* Turn off LED */
-			err = pca955x_led_set(led, LED_OFF);
-			if (err)
-				return err;
+			/*
+			 * For default-state == "keep", let the core update the
+			 * brightness from the hardware, then check the
+			 * brightness to see if it's using PWM1. If so, PWM1
+			 * should not be written below.
+			 */
+			if (pdata->leds[i].default_state ==
+			    LEDS_GPIO_DEFSTATE_KEEP) {
+				if (led->brightness != LED_FULL &&
+				    led->brightness != LED_OFF &&
+				    led->brightness != LED_HALF)
+					keep_pwm = true;
+			}
 		}
 	}
 
@@ -581,10 +617,12 @@ static int pca955x_probe(struct i2c_client *client,
 	if (err)
 		return err;
 
-	/* PWM1 is used for variable brightness, default to OFF */
-	err = pca955x_write_pwm(client, 1, 0);
-	if (err)
-		return err;
+	if (!keep_pwm) {
+		/* PWM1 is used for variable brightness, default to OFF */
+		err = pca955x_write_pwm(client, 1, 0);
+		if (err)
+			return err;
+	}
 
 	/* Set to fast frequency so we do not see flashing */
 	err = pca955x_write_psc(client, 0, 0);
-- 
2.27.0

[PATCH v2 6/7] leds: pca955x: Let the core process the fwnode

[Eddie James]

Much of the fwnode processing in the PCA955x driver is now in the
LEDs core driver, so pass the fwnode in the init data when
registering the LED device. In order to preserve the existing naming
scheme, check for an empty name and set it to the LED number.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/leds/leds-pca955x.c | 58 +++++++++++++++++++------------------
 1 file changed, 30 insertions(+), 28 deletions(-)

diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c
index fa1d77d86ef6..a6aa4b9abde8 100644
--- a/drivers/leds/leds-pca955x.c
+++ b/drivers/leds/leds-pca955x.c
@@ -127,10 +127,9 @@ struct pca955x_led {
 	struct pca955x	*pca955x;
 	struct led_classdev	led_cdev;
 	int			led_num;	/* 0 .. 15 potentially */
-	char			name[32];
 	u32			type;
 	int			default_state;
-	const char		*default_trigger;
+	struct fwnode_handle	*fwnode;
 };
 
 struct pca955x_platform_data {
@@ -439,7 +438,6 @@ pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip)
 		return ERR_PTR(-ENOMEM);
 
 	device_for_each_child_node(&client->dev, child) {
-		const char *name;
 		const char *state;
 		u32 reg;
 		int res;
@@ -448,17 +446,10 @@ pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip)
 		if ((res != 0) || (reg >= chip->bits))
 			continue;
 
-		res = fwnode_property_read_string(child, "label", &name);
-		if ((res != 0) && is_of_node(child))
-			name = to_of_node(child)->name;
-
 		led = &pdata->leds[reg];
-		snprintf(led->name, sizeof(led->name), "%s", name);
-
 		led->type = PCA955X_TYPE_LED;
+		led->fwnode = child;
 		fwnode_property_read_u32(child, "type", &led->type);
-		fwnode_property_read_string(child, "linux,default-trigger",
-					    &led->default_trigger);
 
 		if (!fwnode_property_read_string(child, "default-state",
 						 &state)) {
@@ -495,11 +486,14 @@ static int pca955x_probe(struct i2c_client *client,
 	struct pca955x_led *pca955x_led;
 	struct pca955x_chipdef *chip;
 	struct led_classdev *led;
+	struct led_init_data init_data;
 	struct i2c_adapter *adapter;
 	int i, err;
 	struct pca955x_platform_data *pdata;
 	int ngpios = 0;
+	bool set_default_label = false;
 	bool keep_pwm = false;
+	char default_label[8];
 
 	chip = &pca955x_chipdefs[id->driver_data];
 	adapter = client->adapter;
@@ -547,6 +541,9 @@ static int pca955x_probe(struct i2c_client *client,
 	pca955x->client = client;
 	pca955x->chipdef = chip;
 
+	init_data.devname_mandatory = false;
+	init_data.devicename = "pca955x";
+
 	for (i = 0; i < chip->bits; i++) {
 		pca955x_led = &pca955x->leds[i];
 		pca955x_led->led_num = i;
@@ -560,23 +557,7 @@ static int pca955x_probe(struct i2c_client *client,
 			ngpios++;
 			break;
 		case PCA955X_TYPE_LED:
-			/*
-			 * Platform data can specify LED names and
-			 * default triggers
-			 */
-			if (pdata->leds[i].name[0] == '\0')
-				snprintf(pdata->leds[i].name,
-					 sizeof(pdata->leds[i].name), "%d", i);
-
-			snprintf(pca955x_led->name, sizeof(pca955x_led->name),
-				 "pca955x:%s", pdata->leds[i].name);
-
 			led = &pca955x_led->led_cdev;
-			if (pdata->leds[i].default_trigger)
-				led->default_trigger =
-					pdata->leds[i].default_trigger;
-
-			led->name = pca955x_led->name;
 			led->brightness_set_blocking = pca955x_led_set;
 			led->brightness_get = pca955x_led_get;
 
@@ -592,7 +573,28 @@ static int pca955x_probe(struct i2c_client *client,
 					return err;
 			}
 
-			err = devm_led_classdev_register(&client->dev, led);
+			init_data.fwnode = pdata->leds[i].fwnode;
+
+			if (is_of_node(init_data.fwnode)) {
+				if (to_of_node(init_data.fwnode)->name[0] ==
+				    '\0')
+					set_default_label = true;
+				else
+					set_default_label = false;
+			} else {
+				set_default_label = true;
+			}
+
+			if (set_default_label) {
+				snprintf(default_label, sizeof(default_label),
+					 "%d", i);
+				init_data.default_label = default_label;
+			} else {
+				init_data.default_label = NULL;
+			}
+
+			err = devm_led_classdev_register_ext(&client->dev, led,
+							     &init_data);
 			if (err)
 				return err;
 
-- 
2.27.0

Re: [PATCH v2 6/7] leds: pca955x: Let the core process the fwnode

[Pavel Machek]

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Hi!

> -			err = devm_led_classdev_register(&client->dev, led);
> +			init_data.fwnode = pdata->leds[i].fwnode;
> +
> +			if (is_of_node(init_data.fwnode)) {
> +				if (to_of_node(init_data.fwnode)->name[0] ==
> +				    '\0')
> +					set_default_label = true;
> +				else
> +					set_default_label = false;
> +			} else {
> +				set_default_label = true;
> +			}

I'd write it as

		set_default_label = true;
		if (... && ...)
			set_default_label = false;

> +			if (set_default_label) {
> +				snprintf(default_label, sizeof(default_label),
> +					 "%d", i);
> +				init_data.default_label = default_label;
> +			} else {
> +				init_data.default_label = NULL;
> +			}

		init_data.default_label = NULL;
		if (...) {
		      set_default_label) {
> +				snprintf(default_label, sizeof(default_label),
> +					 "%d", i);
> +				init_data.default_label = default_label;
		}


Thank you,
							Pavel
-- 
http://www.livejournal.com/~pavelmachek

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[PATCH v2 7/7] leds: pca955x: Switch to i2c probe_new

[Eddie James]

The deprecated i2c probe functionality doesn't work with OF
compatible strings, as it only checks for the i2c device id. Switch
to the new way of probing and grab the match data to select the
chip type.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/leds/leds-pca955x.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c
index a6aa4b9abde8..a6b5699aeae4 100644
--- a/drivers/leds/leds-pca955x.c
+++ b/drivers/leds/leds-pca955x.c
@@ -479,8 +479,7 @@ static const struct of_device_id of_pca955x_match[] = {
 };
 MODULE_DEVICE_TABLE(of, of_pca955x_match);
 
-static int pca955x_probe(struct i2c_client *client,
-			 const struct i2c_device_id *id)
+static int pca955x_probe(struct i2c_client *client)
 {
 	struct pca955x *pca955x;
 	struct pca955x_led *pca955x_led;
@@ -494,8 +493,24 @@ static int pca955x_probe(struct i2c_client *client,
 	bool set_default_label = false;
 	bool keep_pwm = false;
 	char default_label[8];
+	enum pca955x_type chip_type;
+	const void *md = device_get_match_data(&client->dev);
 
-	chip = &pca955x_chipdefs[id->driver_data];
+	if (md) {
+		chip_type = (enum pca955x_type)md;
+	} else {
+		const struct i2c_device_id *id = i2c_match_id(pca955x_id,
+							      client);
+
+		if (id) {
+			chip_type = (enum pca955x_type)id->driver_data;
+		} else {
+			dev_err(&client->dev, "unknown chip\n");
+			return -ENODEV;
+		}
+	}
+
+	chip = &pca955x_chipdefs[chip_type];
 	adapter = client->adapter;
 	pdata = dev_get_platdata(&client->dev);
 	if (!pdata) {
@@ -670,7 +685,7 @@ static struct i2c_driver pca955x_driver = {
 		.name	= "leds-pca955x",
 		.of_match_table = of_pca955x_match,
 	},
-	.probe	= pca955x_probe,
+	.probe_new = pca955x_probe,
 	.id_table = pca955x_id,
 };
 
-- 
2.27.0

Re: [PATCH v2 0/7] leds: Support retaining state for the PCA955x

[Pavel Machek]

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Hi!

> This series implements the ability to retain the state of the LEDs
> controlled by the PCA955x across system reboots. This includes a
> change to the LED core driver to respect the retain-state-shutdown
> device tree property. It also cleans up the PCA955x driver, adds the
> ability to query the hardware LED brightness, switches the I2C probe
> function to probe_new, and uses more core functionality for parsing
> the fwnode.

Thanks, applied.
								Pavel
-- 
http://www.livejournal.com/~pavelmachek

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