linux-kernel - Re: [PATCH -next] ALSA: control_led

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Date:   Sun, 23 May 2021 18:11:33 +0900
From:   Takashi Sakamoto <o-takashi@...amocchi.jp>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] ALSA: control_led - use DEVICE_ATTR_*() macro

On Sun, May 23, 2021 at 03:11:09PM +0800, YueHaibing wrote:
> Use DEVICE_ATTR_*() helper instead of plain DEVICE_ATTR,
> which makes the code a bit shorter and easier to read.
> 
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
>  sound/core/control_led.c | 34 +++++++++++++++++++---------------
>  1 file changed, 19 insertions(+), 15 deletions(-)
 
The usage of common macro is better way for safe than own way as long as
achieving the same function. This looks good to me.

Reviewed-by: Takashi Sakamoto <o-takashi@...amocchi.jp>

> diff --git a/sound/core/control_led.c b/sound/core/control_led.c
> index 25f57c14f294..a5e751f26d46 100644
> --- a/sound/core/control_led.c
> +++ b/sound/core/control_led.c
> @@ -375,7 +375,7 @@ static void snd_ctl_led_disconnect(struct snd_card *card)
>   * sysfs
>   */
>  
> -static ssize_t show_mode(struct device *dev,
> +static ssize_t mode_show(struct device *dev,
>  			 struct device_attribute *attr, char *buf)
>  {
>  	struct snd_ctl_led *led = container_of(dev, struct snd_ctl_led, dev);
> @@ -390,7 +390,8 @@ static ssize_t show_mode(struct device *dev,
>  	return sprintf(buf, "%s\n", str);
>  }
>  
> -static ssize_t store_mode(struct device *dev, struct device_attribute *attr,
> +static ssize_t mode_store(struct device *dev,
> +			  struct device_attribute *attr,
>  			  const char *buf, size_t count)
>  {
>  	struct snd_ctl_led *led = container_of(dev, struct snd_ctl_led, dev);
> @@ -419,7 +420,7 @@ static ssize_t store_mode(struct device *dev, struct device_attribute *attr,
>  	return count;
>  }
>  
> -static ssize_t show_brightness(struct device *dev,
> +static ssize_t brightness_show(struct device *dev,
>  			       struct device_attribute *attr, char *buf)
>  {
>  	struct snd_ctl_led *led = container_of(dev, struct snd_ctl_led, dev);
> @@ -427,8 +428,8 @@ static ssize_t show_brightness(struct device *dev,
>  	return sprintf(buf, "%u\n", ledtrig_audio_get(led->trigger_type));
>  }
>  
> -static DEVICE_ATTR(mode, 0644, show_mode, store_mode);
> -static DEVICE_ATTR(brightness, 0444, show_brightness, NULL);
> +static DEVICE_ATTR_RW(mode);
> +static DEVICE_ATTR_RO(brightness);
>  
>  static struct attribute *snd_ctl_led_dev_attrs[] = {
>  	&dev_attr_mode.attr,
> @@ -562,22 +563,25 @@ static ssize_t set_led_id(struct snd_ctl_led_card *led_card, const char *buf, si
>  	return count;
>  }
>  
> -static ssize_t parse_attach(struct device *dev, struct device_attribute *attr,
> +static ssize_t attach_store(struct device *dev,
> +			    struct device_attribute *attr,
>  			    const char *buf, size_t count)
>  {
>  	struct snd_ctl_led_card *led_card = container_of(dev, struct snd_ctl_led_card, dev);
>  	return set_led_id(led_card, buf, count, true);
>  }
>  
> -static ssize_t parse_detach(struct device *dev, struct device_attribute *attr,
> +static ssize_t detach_store(struct device *dev,
> +			    struct device_attribute *attr,
>  			    const char *buf, size_t count)
>  {
>  	struct snd_ctl_led_card *led_card = container_of(dev, struct snd_ctl_led_card, dev);
>  	return set_led_id(led_card, buf, count, false);
>  }
>  
> -static ssize_t ctl_reset(struct device *dev, struct device_attribute *attr,
> -			 const char *buf, size_t count)
> +static ssize_t reset_store(struct device *dev,
> +			   struct device_attribute *attr,
> +			   const char *buf, size_t count)
>  {
>  	struct snd_ctl_led_card *led_card = container_of(dev, struct snd_ctl_led_card, dev);
>  	int err;
> @@ -590,8 +594,8 @@ static ssize_t ctl_reset(struct device *dev, struct device_attribute *attr,
>  	return count;
>  }
>  
> -static ssize_t ctl_list(struct device *dev,
> -			struct device_attribute *attr, char *buf)
> +static ssize_t list_show(struct device *dev,
> +			 struct device_attribute *attr, char *buf)
>  {
>  	struct snd_ctl_led_card *led_card = container_of(dev, struct snd_ctl_led_card, dev);
>  	struct snd_card *card;
> @@ -624,10 +628,10 @@ static ssize_t ctl_list(struct device *dev,
>  	return buf2 - buf;
>  }
>  
> -static DEVICE_ATTR(attach, 0200, NULL, parse_attach);
> -static DEVICE_ATTR(detach, 0200, NULL, parse_detach);
> -static DEVICE_ATTR(reset, 0200, NULL, ctl_reset);
> -static DEVICE_ATTR(list, 0444, ctl_list, NULL);
> +static DEVICE_ATTR_WO(attach);
> +static DEVICE_ATTR_WO(detach);
> +static DEVICE_ATTR_WO(reset);
> +static DEVICE_ATTR_RO(list);
>  
>  static struct attribute *snd_ctl_led_card_attrs[] = {
>  	&dev_attr_attach.attr,
> -- 
> 2.17.1
 

Regards

Takashi Sakamoto