diff options
| author | Jacek Anaszewski <j.anaszewski@samsung.com> | 2014-11-14 02:50:18 -0800 |
|---|---|---|
| committer | Bryan Wu <cooloney@gmail.com> | 2014-11-14 14:29:35 -0800 |
| commit | 4d71a4a12b130ad033219e6f58c74a64059415eb (patch) | |
| tree | 5b9560719835c5a204b92f4bb7e44aae6793281c /drivers/leds/leds.h | |
| parent | acd899e4f3066b6662f6047da5b795cc762093cb (diff) | |
| download | linux-4d71a4a12b130ad033219e6f58c74a64059415eb.tar.bz2 | |
leds: Add support for setting brightness in a synchronous way
There are use cases when setting a LED brightness has to
have immediate effect (e.g. setting a torch LED brightness).
This patch extends LED subsystem to support such operations.
The LED subsystem internal API __led_set_brightness is changed
to led_set_brightness_async and new led_set_brightness_sync API
is added.
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
Diffstat (limited to 'drivers/leds/leds.h')
| -rw-r--r-- | drivers/leds/leds.h | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/drivers/leds/leds.h b/drivers/leds/leds.h index 4c50365344a9..2348dbda5269 100644 --- a/drivers/leds/leds.h +++ b/drivers/leds/leds.h @@ -17,16 +17,28 @@ #include <linux/rwsem.h> #include <linux/leds.h> -static inline void __led_set_brightness(struct led_classdev *led_cdev, +static inline void led_set_brightness_async(struct led_classdev *led_cdev, enum led_brightness value) { - if (value > led_cdev->max_brightness) - value = led_cdev->max_brightness; - led_cdev->brightness = value; + led_cdev->brightness = min(value, led_cdev->max_brightness); + if (!(led_cdev->flags & LED_SUSPENDED)) led_cdev->brightness_set(led_cdev, value); } +static inline int led_set_brightness_sync(struct led_classdev *led_cdev, + enum led_brightness value) +{ + int ret = 0; + + led_cdev->brightness = min(value, led_cdev->max_brightness); + + if (!(led_cdev->flags & LED_SUSPENDED)) + ret = led_cdev->brightness_set_sync(led_cdev, + led_cdev->brightness); + return ret; +} + static inline int led_get_brightness(struct led_classdev *led_cdev) { return led_cdev->brightness; |