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>
diff --git a/drivers/leds/leds.h b/drivers/leds/leds.h
index 4c50365..2348dbd 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;