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/led-core.c b/drivers/leds/led-core.c
index be6d9fa..9886dac 100644
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -42,13 +42,13 @@
/* never on - just set to off */
if (!delay_on) {
- __led_set_brightness(led_cdev, LED_OFF);
+ led_set_brightness_async(led_cdev, LED_OFF);
return;
}
/* never off - just set to brightness */
if (!delay_off) {
- __led_set_brightness(led_cdev, led_cdev->blink_brightness);
+ led_set_brightness_async(led_cdev, led_cdev->blink_brightness);
return;
}
@@ -117,6 +117,8 @@
void led_set_brightness(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
+ int ret = 0;
+
/* delay brightness setting if need to stop soft-blink timer */
if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) {
led_cdev->delayed_set_value = brightness;
@@ -124,7 +126,17 @@
return;
}
- __led_set_brightness(led_cdev, brightness);
+ if (led_cdev->flags & SET_BRIGHTNESS_ASYNC) {
+ led_set_brightness_async(led_cdev, brightness);
+ return;
+ } else if (led_cdev->flags & SET_BRIGHTNESS_SYNC)
+ ret = led_set_brightness_sync(led_cdev, brightness);
+ else
+ ret = -EINVAL;
+
+ if (ret < 0)
+ dev_dbg(led_cdev->dev, "Setting LED brightness failed (%d)\n",
+ ret);
}
EXPORT_SYMBOL(led_set_brightness);