[PATCH v2 0/2] leds: tlc591xx: switch to OF and managed API

[PATCH v2 0/2] leds: tlc591xx: switch to OF and managed API

[Jean-Jacques Hiblot]

This mini-series updates the tlc591xx driver to use the managed API. The
driver is also modified to pass the DT node to the LED core layer.
The goal is to be able to the generic led-backlight [0] driver on top of
it.

changes in v2:
- fixed LED indexing. Previous version did not allow for holes: if n LEDs
  were used, they had to be led(0) to led(n-1)

Jean-Jacques Hiblot (2):
  leds: tlc591xx: simplify driver by using the managed led API
  leds: tlc591xx: Use the OF version of the LED registration function

 drivers/leds/leds-tlc591xx.c | 79 +++++++++---------------------------
 1 file changed, 20 insertions(+), 59 deletions(-)

-- 
2.17.1

[PATCH v2 0/2] leds: tlc591xx: switch to OF and managed API

[Jean-Jacques Hiblot]

This mini-series updates the tlc591xx driver to use the managed API. The
driver is also modified to pass the DT node to the LED core layer.
The goal is to be able to the generic led-backlight [0] driver on top of
it.

changes in v2:
- fixed LED indexing. Previous version did not allow for holes: if n LEDs
  were used, they had to be led(0) to led(n-1)

Jean-Jacques Hiblot (2):
  leds: tlc591xx: simplify driver by using the managed led API
  leds: tlc591xx: Use the OF version of the LED registration function

 drivers/leds/leds-tlc591xx.c | 79 +++++++++---------------------------
 1 file changed, 20 insertions(+), 59 deletions(-)

-- 
2.17.1

[PATCH v2 1/2] leds: tlc591xx: simplify driver by using the managed led API

[Jean-Jacques Hiblot]

Use the managed API of the LED class (devm_led_classdev_register()
instead of led_classdev_register()).
This allows us to remove the code used to track-and-destroy the LED devices

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
---
 drivers/leds/leds-tlc591xx.c | 79 +++++++++---------------------------
 1 file changed, 20 insertions(+), 59 deletions(-)

diff --git a/drivers/leds/leds-tlc591xx.c b/drivers/leds/leds-tlc591xx.c
index 59ff088c7d75..3d5a4b92f016 100644
--- a/drivers/leds/leds-tlc591xx.c
+++ b/drivers/leds/leds-tlc591xx.c
@@ -128,51 +128,6 @@ tlc591xx_brightness_set(struct led_classdev *led_cdev,
 	return err;
 }
 
-static void
-tlc591xx_destroy_devices(struct tlc591xx_priv *priv, unsigned int j)
-{
-	int i = j;
-
-	while (--i >= 0) {
-		if (priv->leds[i].active)
-			led_classdev_unregister(&priv->leds[i].ldev);
-	}
-}
-
-static int
-tlc591xx_configure(struct device *dev,
-		   struct tlc591xx_priv *priv,
-		   const struct tlc591xx *tlc591xx)
-{
-	unsigned int i;
-	int err = 0;
-
-	tlc591xx_set_mode(priv->regmap, MODE2_DIM);
-	for (i = 0; i < TLC591XX_MAX_LEDS; i++) {
-		struct tlc591xx_led *led = &priv->leds[i];
-
-		if (!led->active)
-			continue;
-
-		led->priv = priv;
-		led->led_no = i;
-		led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
-		led->ldev.max_brightness = LED_FULL;
-		err = led_classdev_register(dev, &led->ldev);
-		if (err < 0) {
-			dev_err(dev, "couldn't register LED %s\n",
-				led->ldev.name);
-			goto exit;
-		}
-	}
-
-	return 0;
-
-exit:
-	tlc591xx_destroy_devices(priv, i);
-	return err;
-}
-
 static const struct regmap_config tlc591xx_regmap = {
 	.reg_bits = 8,
 	.val_bits = 8,
@@ -225,7 +180,11 @@ tlc591xx_probe(struct i2c_client *client,
 
 	i2c_set_clientdata(client, priv);
 
+	tlc591xx_set_mode(priv->regmap, MODE2_DIM);
+
 	for_each_child_of_node(np, child) {
+		struct tlc591xx_led *led;
+
 		err = of_property_read_u32(child, "reg", &reg);
 		if (err) {
 			of_node_put(child);
@@ -236,22 +195,25 @@ tlc591xx_probe(struct i2c_client *client,
 			of_node_put(child);
 			return -EINVAL;
 		}
-		priv->leds[reg].active = true;
-		priv->leds[reg].ldev.name =
+		led = &priv->leds[reg];
+
+		led->active = true;
+		led->ldev.name =
 			of_get_property(child, "label", NULL) ? : child->name;
-		priv->leds[reg].ldev.default_trigger =
+		led->ldev.default_trigger =
 			of_get_property(child, "linux,default-trigger", NULL);
-	}
-	return tlc591xx_configure(dev, priv, tlc591xx);
-}
-
-static int
-tlc591xx_remove(struct i2c_client *client)
-{
-	struct tlc591xx_priv *priv = i2c_get_clientdata(client);
-
-	tlc591xx_destroy_devices(priv, TLC591XX_MAX_LEDS);
 
+		led->priv = priv;
+		led->led_no = reg;
+		led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
+		led->ldev.max_brightness = LED_FULL;
+		err = devm_led_classdev_register(dev, &led->ldev);
+		if (err < 0) {
+			dev_err(dev, "couldn't register LED %s\n",
+				led->ldev.name);
+			return err;
+		}
+	}
 	return 0;
 }
 
@@ -268,7 +230,6 @@ static struct i2c_driver tlc591xx_driver = {
 		.of_match_table = of_match_ptr(of_tlc591xx_leds_match),
 	},
 	.probe = tlc591xx_probe,
-	.remove = tlc591xx_remove,
 	.id_table = tlc591xx_id,
 };
 
-- 
2.17.1

[PATCH v2 1/2] leds: tlc591xx: simplify driver by using the managed led API

[Jean-Jacques Hiblot]

Use the managed API of the LED class (devm_led_classdev_register()
instead of led_classdev_register()).
This allows us to remove the code used to track-and-destroy the LED devices

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
---
 drivers/leds/leds-tlc591xx.c | 79 +++++++++---------------------------
 1 file changed, 20 insertions(+), 59 deletions(-)

diff --git a/drivers/leds/leds-tlc591xx.c b/drivers/leds/leds-tlc591xx.c
index 59ff088c7d75..3d5a4b92f016 100644
--- a/drivers/leds/leds-tlc591xx.c
+++ b/drivers/leds/leds-tlc591xx.c
@@ -128,51 +128,6 @@ tlc591xx_brightness_set(struct led_classdev *led_cdev,
 	return err;
 }
 
-static void
-tlc591xx_destroy_devices(struct tlc591xx_priv *priv, unsigned int j)
-{
-	int i = j;
-
-	while (--i >= 0) {
-		if (priv->leds[i].active)
-			led_classdev_unregister(&priv->leds[i].ldev);
-	}
-}
-
-static int
-tlc591xx_configure(struct device *dev,
-		   struct tlc591xx_priv *priv,
-		   const struct tlc591xx *tlc591xx)
-{
-	unsigned int i;
-	int err = 0;
-
-	tlc591xx_set_mode(priv->regmap, MODE2_DIM);
-	for (i = 0; i < TLC591XX_MAX_LEDS; i++) {
-		struct tlc591xx_led *led = &priv->leds[i];
-
-		if (!led->active)
-			continue;
-
-		led->priv = priv;
-		led->led_no = i;
-		led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
-		led->ldev.max_brightness = LED_FULL;
-		err = led_classdev_register(dev, &led->ldev);
-		if (err < 0) {
-			dev_err(dev, "couldn't register LED %s\n",
-				led->ldev.name);
-			goto exit;
-		}
-	}
-
-	return 0;
-
-exit:
-	tlc591xx_destroy_devices(priv, i);
-	return err;
-}
-
 static const struct regmap_config tlc591xx_regmap = {
 	.reg_bits = 8,
 	.val_bits = 8,
@@ -225,7 +180,11 @@ tlc591xx_probe(struct i2c_client *client,
 
 	i2c_set_clientdata(client, priv);
 
+	tlc591xx_set_mode(priv->regmap, MODE2_DIM);
+
 	for_each_child_of_node(np, child) {
+		struct tlc591xx_led *led;
+
 		err = of_property_read_u32(child, "reg", &reg);
 		if (err) {
 			of_node_put(child);
@@ -236,22 +195,25 @@ tlc591xx_probe(struct i2c_client *client,
 			of_node_put(child);
 			return -EINVAL;
 		}
-		priv->leds[reg].active = true;
-		priv->leds[reg].ldev.name =
+		led = &priv->leds[reg];
+
+		led->active = true;
+		led->ldev.name =
 			of_get_property(child, "label", NULL) ? : child->name;
-		priv->leds[reg].ldev.default_trigger =
+		led->ldev.default_trigger =
 			of_get_property(child, "linux,default-trigger", NULL);
-	}
-	return tlc591xx_configure(dev, priv, tlc591xx);
-}
-
-static int
-tlc591xx_remove(struct i2c_client *client)
-{
-	struct tlc591xx_priv *priv = i2c_get_clientdata(client);
-
-	tlc591xx_destroy_devices(priv, TLC591XX_MAX_LEDS);
 
+		led->priv = priv;
+		led->led_no = reg;
+		led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
+		led->ldev.max_brightness = LED_FULL;
+		err = devm_led_classdev_register(dev, &led->ldev);
+		if (err < 0) {
+			dev_err(dev, "couldn't register LED %s\n",
+				led->ldev.name);
+			return err;
+		}
+	}
 	return 0;
 }
 
@@ -268,7 +230,6 @@ static struct i2c_driver tlc591xx_driver = {
 		.of_match_table = of_match_ptr(of_tlc591xx_leds_match),
 	},
 	.probe = tlc591xx_probe,
-	.remove = tlc591xx_remove,
 	.id_table = tlc591xx_id,
 };
 
-- 
2.17.1

[PATCH v2 2/2] leds: tlc591xx: Use the OF version of the LED registration function

[Jean-Jacques Hiblot]

The driver parses the device-tree to identify which LED should be handled.
Since the information about the device node is known at this time, we can
provide the LED core with it. It may be useful later.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
---
 drivers/leds/leds-tlc591xx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/leds/leds-tlc591xx.c b/drivers/leds/leds-tlc591xx.c
index 3d5a4b92f016..10764a62cb71 100644
--- a/drivers/leds/leds-tlc591xx.c
+++ b/drivers/leds/leds-tlc591xx.c
@@ -207,7 +207,7 @@ tlc591xx_probe(struct i2c_client *client,
 		led->led_no = reg;
 		led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
 		led->ldev.max_brightness = LED_FULL;
-		err = devm_led_classdev_register(dev, &led->ldev);
+		err = devm_of_led_classdev_register(dev, child, &led->ldev);
 		if (err < 0) {
 			dev_err(dev, "couldn't register LED %s\n",
 				led->ldev.name);
-- 
2.17.1

[PATCH v2 2/2] leds: tlc591xx: Use the OF version of the LED registration function

[Jean-Jacques Hiblot]

The driver parses the device-tree to identify which LED should be handled.
Since the information about the device node is known at this time, we can
provide the LED core with it. It may be useful later.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
---
 drivers/leds/leds-tlc591xx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/leds/leds-tlc591xx.c b/drivers/leds/leds-tlc591xx.c
index 3d5a4b92f016..10764a62cb71 100644
--- a/drivers/leds/leds-tlc591xx.c
+++ b/drivers/leds/leds-tlc591xx.c
@@ -207,7 +207,7 @@ tlc591xx_probe(struct i2c_client *client,
 		led->led_no = reg;
 		led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
 		led->ldev.max_brightness = LED_FULL;
-		err = devm_led_classdev_register(dev, &led->ldev);
+		err = devm_of_led_classdev_register(dev, child, &led->ldev);
 		if (err < 0) {
 			dev_err(dev, "couldn't register LED %s\n",
 				led->ldev.name);
-- 
2.17.1

Re: [PATCH v2 1/2] leds: tlc591xx: simplify driver by using the managed led API

[Dan Murphy]

JJ

On 7/8/19 5:06 AM, Jean-Jacques Hiblot wrote:
> Use the managed API of the LED class (devm_led_classdev_register()
> instead of led_classdev_register()).
> This allows us to remove the code used to track-and-destroy the LED devices

What changed from v1?

I don't see any changes especially the bounds on the reg property.

Dan


> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
> ---
>   drivers/leds/leds-tlc591xx.c | 79 +++++++++---------------------------
>   1 file changed, 20 insertions(+), 59 deletions(-)
>
> diff --git a/drivers/leds/leds-tlc591xx.c b/drivers/leds/leds-tlc591xx.c
> index 59ff088c7d75..3d5a4b92f016 100644
> --- a/drivers/leds/leds-tlc591xx.c
> +++ b/drivers/leds/leds-tlc591xx.c
> @@ -128,51 +128,6 @@ tlc591xx_brightness_set(struct led_classdev *led_cdev,
>   	return err;
>   }
>   
> -static void
> -tlc591xx_destroy_devices(struct tlc591xx_priv *priv, unsigned int j)
> -{
> -	int i = j;
> -
> -	while (--i >= 0) {
> -		if (priv->leds[i].active)
> -			led_classdev_unregister(&priv->leds[i].ldev);
> -	}
> -}
> -
> -static int
> -tlc591xx_configure(struct device *dev,
> -		   struct tlc591xx_priv *priv,
> -		   const struct tlc591xx *tlc591xx)
> -{
> -	unsigned int i;
> -	int err = 0;
> -
> -	tlc591xx_set_mode(priv->regmap, MODE2_DIM);
> -	for (i = 0; i < TLC591XX_MAX_LEDS; i++) {
> -		struct tlc591xx_led *led = &priv->leds[i];
> -
> -		if (!led->active)
> -			continue;
> -
> -		led->priv = priv;
> -		led->led_no = i;
> -		led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
> -		led->ldev.max_brightness = LED_FULL;
> -		err = led_classdev_register(dev, &led->ldev);
> -		if (err < 0) {
> -			dev_err(dev, "couldn't register LED %s\n",
> -				led->ldev.name);
> -			goto exit;
> -		}
> -	}
> -
> -	return 0;
> -
> -exit:
> -	tlc591xx_destroy_devices(priv, i);
> -	return err;
> -}
> -
>   static const struct regmap_config tlc591xx_regmap = {
>   	.reg_bits = 8,
>   	.val_bits = 8,
> @@ -225,7 +180,11 @@ tlc591xx_probe(struct i2c_client *client,
>   
>   	i2c_set_clientdata(client, priv);
>   
> +	tlc591xx_set_mode(priv->regmap, MODE2_DIM);
> +
>   	for_each_child_of_node(np, child) {
> +		struct tlc591xx_led *led;
> +
>   		err = of_property_read_u32(child, "reg", &reg);
>   		if (err) {
>   			of_node_put(child);
> @@ -236,22 +195,25 @@ tlc591xx_probe(struct i2c_client *client,
>   			of_node_put(child);
>   			return -EINVAL;
>   		}
> -		priv->leds[reg].active = true;
> -		priv->leds[reg].ldev.name =
> +		led = &priv->leds[reg];
> +
> +		led->active = true;
> +		led->ldev.name =
>   			of_get_property(child, "label", NULL) ? : child->name;
> -		priv->leds[reg].ldev.default_trigger =
> +		led->ldev.default_trigger =
>   			of_get_property(child, "linux,default-trigger", NULL);
> -	}
> -	return tlc591xx_configure(dev, priv, tlc591xx);
> -}
> -
> -static int
> -tlc591xx_remove(struct i2c_client *client)
> -{
> -	struct tlc591xx_priv *priv = i2c_get_clientdata(client);
> -
> -	tlc591xx_destroy_devices(priv, TLC591XX_MAX_LEDS);
>   
> +		led->priv = priv;
> +		led->led_no = reg;
> +		led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
> +		led->ldev.max_brightness = LED_FULL;
> +		err = devm_led_classdev_register(dev, &led->ldev);
> +		if (err < 0) {
> +			dev_err(dev, "couldn't register LED %s\n",
> +				led->ldev.name);
> +			return err;
> +		}
> +	}
>   	return 0;
>   }
>   
> @@ -268,7 +230,6 @@ static struct i2c_driver tlc591xx_driver = {
>   		.of_match_table = of_match_ptr(of_tlc591xx_leds_match),
>   	},
>   	.probe = tlc591xx_probe,
> -	.remove = tlc591xx_remove,
>   	.id_table = tlc591xx_id,
>   };
>   

Re: [PATCH v2 1/2] leds: tlc591xx: simplify driver by using the managed led API

[Dan Murphy]

JJ

On 7/8/19 5:06 AM, Jean-Jacques Hiblot wrote:
> Use the managed API of the LED class (devm_led_classdev_register()
> instead of led_classdev_register()).
> This allows us to remove the code used to track-and-destroy the LED devices

What changed from v1?

I don't see any changes especially the bounds on the reg property.

Dan


> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
> ---
>   drivers/leds/leds-tlc591xx.c | 79 +++++++++---------------------------
>   1 file changed, 20 insertions(+), 59 deletions(-)
>
> diff --git a/drivers/leds/leds-tlc591xx.c b/drivers/leds/leds-tlc591xx.c
> index 59ff088c7d75..3d5a4b92f016 100644
> --- a/drivers/leds/leds-tlc591xx.c
> +++ b/drivers/leds/leds-tlc591xx.c
> @@ -128,51 +128,6 @@ tlc591xx_brightness_set(struct led_classdev *led_cdev,
>   	return err;
>   }
>   
> -static void
> -tlc591xx_destroy_devices(struct tlc591xx_priv *priv, unsigned int j)
> -{
> -	int i = j;
> -
> -	while (--i >= 0) {
> -		if (priv->leds[i].active)
> -			led_classdev_unregister(&priv->leds[i].ldev);
> -	}
> -}
> -
> -static int
> -tlc591xx_configure(struct device *dev,
> -		   struct tlc591xx_priv *priv,
> -		   const struct tlc591xx *tlc591xx)
> -{
> -	unsigned int i;
> -	int err = 0;
> -
> -	tlc591xx_set_mode(priv->regmap, MODE2_DIM);
> -	for (i = 0; i < TLC591XX_MAX_LEDS; i++) {
> -		struct tlc591xx_led *led = &priv->leds[i];
> -
> -		if (!led->active)
> -			continue;
> -
> -		led->priv = priv;
> -		led->led_no = i;
> -		led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
> -		led->ldev.max_brightness = LED_FULL;
> -		err = led_classdev_register(dev, &led->ldev);
> -		if (err < 0) {
> -			dev_err(dev, "couldn't register LED %s\n",
> -				led->ldev.name);
> -			goto exit;
> -		}
> -	}
> -
> -	return 0;
> -
> -exit:
> -	tlc591xx_destroy_devices(priv, i);
> -	return err;
> -}
> -
>   static const struct regmap_config tlc591xx_regmap = {
>   	.reg_bits = 8,
>   	.val_bits = 8,
> @@ -225,7 +180,11 @@ tlc591xx_probe(struct i2c_client *client,
>   
>   	i2c_set_clientdata(client, priv);
>   
> +	tlc591xx_set_mode(priv->regmap, MODE2_DIM);
> +
>   	for_each_child_of_node(np, child) {
> +		struct tlc591xx_led *led;
> +
>   		err = of_property_read_u32(child, "reg", &reg);
>   		if (err) {
>   			of_node_put(child);
> @@ -236,22 +195,25 @@ tlc591xx_probe(struct i2c_client *client,
>   			of_node_put(child);
>   			return -EINVAL;
>   		}
> -		priv->leds[reg].active = true;
> -		priv->leds[reg].ldev.name =
> +		led = &priv->leds[reg];
> +
> +		led->active = true;
> +		led->ldev.name =
>   			of_get_property(child, "label", NULL) ? : child->name;
> -		priv->leds[reg].ldev.default_trigger =
> +		led->ldev.default_trigger =
>   			of_get_property(child, "linux,default-trigger", NULL);
> -	}
> -	return tlc591xx_configure(dev, priv, tlc591xx);
> -}
> -
> -static int
> -tlc591xx_remove(struct i2c_client *client)
> -{
> -	struct tlc591xx_priv *priv = i2c_get_clientdata(client);
> -
> -	tlc591xx_destroy_devices(priv, TLC591XX_MAX_LEDS);
>   
> +		led->priv = priv;
> +		led->led_no = reg;
> +		led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
> +		led->ldev.max_brightness = LED_FULL;
> +		err = devm_led_classdev_register(dev, &led->ldev);
> +		if (err < 0) {
> +			dev_err(dev, "couldn't register LED %s\n",
> +				led->ldev.name);
> +			return err;
> +		}
> +	}
>   	return 0;
>   }
>   
> @@ -268,7 +230,6 @@ static struct i2c_driver tlc591xx_driver = {
>   		.of_match_table = of_match_ptr(of_tlc591xx_leds_match),
>   	},
>   	.probe = tlc591xx_probe,
> -	.remove = tlc591xx_remove,
>   	.id_table = tlc591xx_id,
>   };
>   

Re: [PATCH v2 1/2] leds: tlc591xx: simplify driver by using the managed led API

[Jean-Jacques Hiblot]

Hi Dan,

On 08/07/2019 20:08, Dan Murphy wrote:
> JJ
>
> On 7/8/19 5:06 AM, Jean-Jacques Hiblot wrote:
>> Use the managed API of the LED class (devm_led_classdev_register()
>> instead of led_classdev_register()).
>> This allows us to remove the code used to track-and-destroy the LED 
>> devices
>
> What changed from v1?

What changed is a bug fix in the loop: replaced led = &priv->leds[idx] 
with led = &priv->leds[reg];


>
> I don't see any changes especially the bounds on the reg property.

It is not quite apparent in the diff, but there is such a check. Here is 
what we have in the probe():

     for_each_child_of_node(np, child) {
         struct tlc591xx_led *led;

         err = of_property_read_u32(child, "reg", &reg);
         if (err) {
             of_node_put(child);
             return err;
         }
         if (reg < 0 || reg >= tlc591xx->max_leds ||
             priv->leds[reg].active) {
             of_node_put(child);
             return -EINVAL;
         }
         led = &priv->leds[reg];

[...]
         }
     }

>
> Dan
>
>
>> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
>> ---
>>   drivers/leds/leds-tlc591xx.c | 79 +++++++++---------------------------
>>   1 file changed, 20 insertions(+), 59 deletions(-)
>>
>> diff --git a/drivers/leds/leds-tlc591xx.c b/drivers/leds/leds-tlc591xx.c
>> index 59ff088c7d75..3d5a4b92f016 100644
>> --- a/drivers/leds/leds-tlc591xx.c
>> +++ b/drivers/leds/leds-tlc591xx.c
>> @@ -128,51 +128,6 @@ tlc591xx_brightness_set(struct led_classdev 
>> *led_cdev,
>>       return err;
>>   }
>>   -static void
>> -tlc591xx_destroy_devices(struct tlc591xx_priv *priv, unsigned int j)
>> -{
>> -    int i = j;
>> -
>> -    while (--i >= 0) {
>> -        if (priv->leds[i].active)
>> - led_classdev_unregister(&priv->leds[i].ldev);
>> -    }
>> -}
>> -
>> -static int
>> -tlc591xx_configure(struct device *dev,
>> -           struct tlc591xx_priv *priv,
>> -           const struct tlc591xx *tlc591xx)
>> -{
>> -    unsigned int i;
>> -    int err = 0;
>> -
>> -    tlc591xx_set_mode(priv->regmap, MODE2_DIM);
>> -    for (i = 0; i < TLC591XX_MAX_LEDS; i++) {
>> -        struct tlc591xx_led *led = &priv->leds[i];
>> -
>> -        if (!led->active)
>> -            continue;
>> -
>> -        led->priv = priv;
>> -        led->led_no = i;
>> -        led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
>> -        led->ldev.max_brightness = LED_FULL;
>> -        err = led_classdev_register(dev, &led->ldev);
>> -        if (err < 0) {
>> -            dev_err(dev, "couldn't register LED %s\n",
>> -                led->ldev.name);
>> -            goto exit;
>> -        }
>> -    }
>> -
>> -    return 0;
>> -
>> -exit:
>> -    tlc591xx_destroy_devices(priv, i);
>> -    return err;
>> -}
>> -
>>   static const struct regmap_config tlc591xx_regmap = {
>>       .reg_bits = 8,
>>       .val_bits = 8,
>> @@ -225,7 +180,11 @@ tlc591xx_probe(struct i2c_client *client,
>>         i2c_set_clientdata(client, priv);
>>   +    tlc591xx_set_mode(priv->regmap, MODE2_DIM);
>> +
>>       for_each_child_of_node(np, child) {
>> +        struct tlc591xx_led *led;
>> +
>>           err = of_property_read_u32(child, "reg", &reg);
>>           if (err) {
>>               of_node_put(child);
>> @@ -236,22 +195,25 @@ tlc591xx_probe(struct i2c_client *client,
>>               of_node_put(child);
>>               return -EINVAL;
>>           }
>> -        priv->leds[reg].active = true;
>> -        priv->leds[reg].ldev.name =
>> +        led = &priv->leds[reg];
>> +
>> +        led->active = true;
>> +        led->ldev.name =
>>               of_get_property(child, "label", NULL) ? : child->name;
>> -        priv->leds[reg].ldev.default_trigger =
>> +        led->ldev.default_trigger =
>>               of_get_property(child, "linux,default-trigger", NULL);
>> -    }
>> -    return tlc591xx_configure(dev, priv, tlc591xx);
>> -}
>> -
>> -static int
>> -tlc591xx_remove(struct i2c_client *client)
>> -{
>> -    struct tlc591xx_priv *priv = i2c_get_clientdata(client);
>> -
>> -    tlc591xx_destroy_devices(priv, TLC591XX_MAX_LEDS);
>>   +        led->priv = priv;
>> +        led->led_no = reg;
>> +        led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
>> +        led->ldev.max_brightness = LED_FULL;
>> +        err = devm_led_classdev_register(dev, &led->ldev);
>> +        if (err < 0) {
>> +            dev_err(dev, "couldn't register LED %s\n",
>> +                led->ldev.name);
>> +            return err;
>> +        }
>> +    }
>>       return 0;
>>   }
>>   @@ -268,7 +230,6 @@ static struct i2c_driver tlc591xx_driver = {
>>           .of_match_table = of_match_ptr(of_tlc591xx_leds_match),
>>       },
>>       .probe = tlc591xx_probe,
>> -    .remove = tlc591xx_remove,
>>       .id_table = tlc591xx_id,
>>   };

Re: [PATCH v2 1/2] leds: tlc591xx: simplify driver by using the managed led API

[Jean-Jacques Hiblot]

Hi Dan,

On 08/07/2019 20:08, Dan Murphy wrote:
> JJ
>
> On 7/8/19 5:06 AM, Jean-Jacques Hiblot wrote:
>> Use the managed API of the LED class (devm_led_classdev_register()
>> instead of led_classdev_register()).
>> This allows us to remove the code used to track-and-destroy the LED 
>> devices
>
> What changed from v1?

What changed is a bug fix in the loop: replaced led = &priv->leds[idx] 
with led = &priv->leds[reg];


>
> I don't see any changes especially the bounds on the reg property.

It is not quite apparent in the diff, but there is such a check. Here is 
what we have in the probe():

     for_each_child_of_node(np, child) {
         struct tlc591xx_led *led;

         err = of_property_read_u32(child, "reg", &reg);
         if (err) {
             of_node_put(child);
             return err;
         }
         if (reg < 0 || reg >= tlc591xx->max_leds ||
             priv->leds[reg].active) {
             of_node_put(child);
             return -EINVAL;
         }
         led = &priv->leds[reg];

[...]
         }
     }

>
> Dan
>
>
>> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
>> ---
>>   drivers/leds/leds-tlc591xx.c | 79 +++++++++---------------------------
>>   1 file changed, 20 insertions(+), 59 deletions(-)
>>
>> diff --git a/drivers/leds/leds-tlc591xx.c b/drivers/leds/leds-tlc591xx.c
>> index 59ff088c7d75..3d5a4b92f016 100644
>> --- a/drivers/leds/leds-tlc591xx.c
>> +++ b/drivers/leds/leds-tlc591xx.c
>> @@ -128,51 +128,6 @@ tlc591xx_brightness_set(struct led_classdev 
>> *led_cdev,
>>       return err;
>>   }
>>   -static void
>> -tlc591xx_destroy_devices(struct tlc591xx_priv *priv, unsigned int j)
>> -{
>> -    int i = j;
>> -
>> -    while (--i >= 0) {
>> -        if (priv->leds[i].active)
>> - led_classdev_unregister(&priv->leds[i].ldev);
>> -    }
>> -}
>> -
>> -static int
>> -tlc591xx_configure(struct device *dev,
>> -           struct tlc591xx_priv *priv,
>> -           const struct tlc591xx *tlc591xx)
>> -{
>> -    unsigned int i;
>> -    int err = 0;
>> -
>> -    tlc591xx_set_mode(priv->regmap, MODE2_DIM);
>> -    for (i = 0; i < TLC591XX_MAX_LEDS; i++) {
>> -        struct tlc591xx_led *led = &priv->leds[i];
>> -
>> -        if (!led->active)
>> -            continue;
>> -
>> -        led->priv = priv;
>> -        led->led_no = i;
>> -        led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
>> -        led->ldev.max_brightness = LED_FULL;
>> -        err = led_classdev_register(dev, &led->ldev);
>> -        if (err < 0) {
>> -            dev_err(dev, "couldn't register LED %s\n",
>> -                led->ldev.name);
>> -            goto exit;
>> -        }
>> -    }
>> -
>> -    return 0;
>> -
>> -exit:
>> -    tlc591xx_destroy_devices(priv, i);
>> -    return err;
>> -}
>> -
>>   static const struct regmap_config tlc591xx_regmap = {
>>       .reg_bits = 8,
>>       .val_bits = 8,
>> @@ -225,7 +180,11 @@ tlc591xx_probe(struct i2c_client *client,
>>         i2c_set_clientdata(client, priv);
>>   +    tlc591xx_set_mode(priv->regmap, MODE2_DIM);
>> +
>>       for_each_child_of_node(np, child) {
>> +        struct tlc591xx_led *led;
>> +
>>           err = of_property_read_u32(child, "reg", &reg);
>>           if (err) {
>>               of_node_put(child);
>> @@ -236,22 +195,25 @@ tlc591xx_probe(struct i2c_client *client,
>>               of_node_put(child);
>>               return -EINVAL;
>>           }
>> -        priv->leds[reg].active = true;
>> -        priv->leds[reg].ldev.name =
>> +        led = &priv->leds[reg];
>> +
>> +        led->active = true;
>> +        led->ldev.name =
>>               of_get_property(child, "label", NULL) ? : child->name;
>> -        priv->leds[reg].ldev.default_trigger =
>> +        led->ldev.default_trigger =
>>               of_get_property(child, "linux,default-trigger", NULL);
>> -    }
>> -    return tlc591xx_configure(dev, priv, tlc591xx);
>> -}
>> -
>> -static int
>> -tlc591xx_remove(struct i2c_client *client)
>> -{
>> -    struct tlc591xx_priv *priv = i2c_get_clientdata(client);
>> -
>> -    tlc591xx_destroy_devices(priv, TLC591XX_MAX_LEDS);
>>   +        led->priv = priv;
>> +        led->led_no = reg;
>> +        led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
>> +        led->ldev.max_brightness = LED_FULL;
>> +        err = devm_led_classdev_register(dev, &led->ldev);
>> +        if (err < 0) {
>> +            dev_err(dev, "couldn't register LED %s\n",
>> +                led->ldev.name);
>> +            return err;
>> +        }
>> +    }
>>       return 0;
>>   }
>>   @@ -268,7 +230,6 @@ static struct i2c_driver tlc591xx_driver = {
>>           .of_match_table = of_match_ptr(of_tlc591xx_leds_match),
>>       },
>>       .probe = tlc591xx_probe,
>> -    .remove = tlc591xx_remove,
>>       .id_table = tlc591xx_id,
>>   };

Re: [PATCH v2 0/2] leds: tlc591xx: switch to OF and managed API

[Tomi Valkeinen]

On 08/07/2019 13:06, Jean-Jacques Hiblot wrote:
> This mini-series updates the tlc591xx driver to use the managed API. The
> driver is also modified to pass the DT node to the LED core layer.
> The goal is to be able to the generic led-backlight [0] driver on top of
> it.
> 
> changes in v2:
> - fixed LED indexing. Previous version did not allow for holes: if n LEDs
>    were used, they had to be led(0) to led(n-1)
> 
> Jean-Jacques Hiblot (2):
>    leds: tlc591xx: simplify driver by using the managed led API
>    leds: tlc591xx: Use the OF version of the LED registration function
> 
>   drivers/leds/leds-tlc591xx.c | 79 +++++++++---------------------------
>   1 file changed, 20 insertions(+), 59 deletions(-)
> 

For the series:

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

  Tomi

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