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@xxxxxxxxxx>
> ---
> 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@xxxxxxxxxxxxx>
> 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
