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| 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 /include/linux/leds.h | |
| parent | leds: implement sysfs interface locking mechanism (diff) | |
| download | linux-dev-4d71a4a12b130ad033219e6f58c74a64059415eb.tar.xz linux-dev-4d71a4a12b130ad033219e6f58c74a64059415eb.zip | |
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 'include/linux/leds.h')
| -rw-r--r-- | include/linux/leds.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/leds.h b/include/linux/leds.h index 737f9b1051f2..dfe70e928eae 100644 --- a/include/linux/leds.h +++ b/include/linux/leds.h @@ -44,11 +44,19 @@ struct led_classdev { #define LED_BLINK_ONESHOT_STOP (1 << 18) #define LED_BLINK_INVERT (1 << 19) #define LED_SYSFS_DISABLE (1 << 20) +#define SET_BRIGHTNESS_ASYNC (1 << 21) +#define SET_BRIGHTNESS_SYNC (1 << 22) /* Set LED brightness level */ /* Must not sleep, use a workqueue if needed */ void (*brightness_set)(struct led_classdev *led_cdev, enum led_brightness brightness); + /* + * Set LED brightness level immediately - it can block the caller for + * the time required for accessing a LED device register. + */ + int (*brightness_set_sync)(struct led_classdev *led_cdev, + enum led_brightness brightness); /* Get LED brightness level */ enum led_brightness (*brightness_get)(struct led_classdev *led_cdev); |