linux-kernel - Re: [PATCH 13/25] leds: lm3692x: Use led_compose

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Date:   Mon, 11 Mar 2019 07:38:27 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        <linux-leds@...r.kernel.org>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <pavel@....cz>, <robh@...nel.org>
Subject: Re: [PATCH 13/25] leds: lm3692x: Use led_compose_name()

On 3/10/19 1:28 PM, Jacek Anaszewski wrote:
> Switch to using generic LED support for composing LED class
> device name.
> 
> Since the same device strings would be used in two places,
> then add macros LM36922_NAME and LM36922_NAME for use in
> lm3692x_probe_dt(() and lm3692x_id array.
> 
> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@...il.com>
> Acked-by: Pavel Machek <pavel@....cz>
> Cc: Dan Murphy <dmurphy@...com>
> ---
>  drivers/leds/leds-lm3692x.c | 39 ++++++++++++++++++++-------------------
>  1 file changed, 20 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/leds/leds-lm3692x.c b/drivers/leds/leds-lm3692x.c
> index 4f413a7c5f05..9dfc0f28a9c8 100644
> --- a/drivers/leds/leds-lm3692x.c
> +++ b/drivers/leds/leds-lm3692x.c
> @@ -13,7 +13,6 @@
>  #include <linux/regmap.h>
>  #include <linux/regulator/consumer.h>
>  #include <linux/slab.h>
> -#include <uapi/linux/uleds.h>
>  
>  #define LM36922_MODEL	0
>  #define LM36923_MODEL	1
> @@ -95,6 +94,9 @@
>  #define LM3692X_FAULT_FLAG_SHRT BIT(3)
>  #define LM3692X_FAULT_FLAG_OPEN BIT(4)
>  
> +#define LM36922_NAME "lm36922"
> +#define LM36923_NAME "lm36923"
> +
>  /**
>   * struct lm3692x_led -
>   * @lock - Lock for reading/writing the device
> @@ -103,7 +105,6 @@
>   * @regmap - Devices register map
>   * @enable_gpio - VDDIO/EN gpio to enable communication interface
>   * @regulator - LED supply regulator pointer
> - * @label - LED label
>   * @led_enable - LED sync to be enabled
>   * @model_id - Current device model ID enumerated
>   */
> @@ -114,7 +115,6 @@ struct lm3692x_led {
>  	struct regmap *regmap;
>  	struct gpio_desc *enable_gpio;
>  	struct regulator *regulator;
> -	char label[LED_MAX_NAME_SIZE];
>  	int led_enable;
>  	int model_id;
>  };
> @@ -325,7 +325,8 @@ static int lm3692x_init(struct lm3692x_led *led)
>  static int lm3692x_probe_dt(struct lm3692x_led *led)
>  {
>  	struct fwnode_handle *child = NULL;
> -	const char *name;
> +	struct led_init_data init_data;
> +	char *model_name;
>  	int ret;
>  
>  	led->enable_gpio = devm_gpiod_get_optional(&led->client->dev,
> @@ -346,17 +347,20 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
>  		dev_err(&led->client->dev, "No LED Child node\n");
>  		return -ENODEV;
>  	}
> +	init_data.fwnode = child;
>  
> -	fwnode_property_read_string(child, "linux,default-trigger",
> -				    &led->led_dev.default_trigger);
> +	if (led->model_id == LM36922_MODEL)
> +		model_name =  LM36922_NAME;
> +	else
> +		model_name =  LM36923_NAME;
>  


Why do we need this change?

led->client->name should suffice here and then we do not have to #define the name at all.


> -	ret = fwnode_property_read_string(child, "label", &name);
> +	ret = led_compose_name(child, model_name, ":backlight_cluster",
> +			       init_data.name);
>  	if (ret)
> -		snprintf(led->label, sizeof(led->label),
> -			"%s::", led->client->name);
> -	else
> -		snprintf(led->label, sizeof(led->label),
> -			 "%s:%s", led->client->name, name);
> +		return ret;
> +
> +	fwnode_property_read_string(child, "linux,default-trigger",
> +				    &led->led_dev.default_trigger);
>  
>  	ret = fwnode_property_read_u32(child, "reg", &led->led_enable);
>  	if (ret) {
> @@ -364,16 +368,13 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
>  		return ret;
>  	}
>  
> -	led->led_dev.name = led->label;
> -
> -	ret = devm_led_classdev_register(&led->client->dev, &led->led_dev);
> +	ret = devm_led_classdev_register_ext(&led->client->dev, &led->led_dev,
> +					     &init_data);
>  	if (ret) {
>  		dev_err(&led->client->dev, "led register err: %d\n", ret);
>  		return ret;
>  	}
>  
> -	led->led_dev.dev->of_node = to_of_node(child);
> -

Seems like an additional change here not documented.
If it is a bug fix or an enhancement probably need a separate patch.

I do know why this is removed just need tracability on the log.

Dan

>  	return 0;
>  }
>  
> @@ -439,8 +440,8 @@ static int lm3692x_remove(struct i2c_client *client)
>  }
>  
>  static const struct i2c_device_id lm3692x_id[] = {
> -	{ "lm36922", LM36922_MODEL },
> -	{ "lm36923", LM36923_MODEL },
> +	{ LM36922_NAME, LM36922_MODEL },
> +	{ LM36923_NAME, LM36923_MODEL },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(i2c, lm3692x_id);
> 


-- 
------------------
Dan Murphy