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-class.c b/drivers/leds/led-class.c
index 65722de..dbeebac 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -55,7 +55,7 @@
if (state == LED_OFF)
led_trigger_remove(led_cdev);
- __led_set_brightness(led_cdev, state);
+ led_set_brightness(led_cdev, state);
ret = size;
unlock:
@@ -109,7 +109,7 @@
unsigned long delay;
if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) {
- __led_set_brightness(led_cdev, LED_OFF);
+ led_set_brightness_async(led_cdev, LED_OFF);
return;
}
@@ -132,7 +132,7 @@
delay = led_cdev->blink_delay_off;
}
- __led_set_brightness(led_cdev, brightness);
+ led_set_brightness_async(led_cdev, brightness);
/* Return in next iteration if led is in one-shot mode and we are in
* the final blink state so that the led is toggled each delay_on +
@@ -158,7 +158,7 @@
led_stop_software_blink(led_cdev);
- __led_set_brightness(led_cdev, led_cdev->delayed_set_value);
+ led_set_brightness_async(led_cdev, led_cdev->delayed_set_value);
}
/**
@@ -233,6 +233,8 @@
if (!led_cdev->max_brightness)
led_cdev->max_brightness = LED_FULL;
+ led_cdev->flags |= SET_BRIGHTNESS_ASYNC;
+
led_update_brightness(led_cdev);
INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);