From 4d71a4a12b130ad033219e6f58c74a64059415eb Mon Sep 17 00:00:00 2001 From: Jacek Anaszewski Date: Fri, 14 Nov 2014 02:50:18 -0800 Subject: 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 Acked-by: Kyungmin Park Cc: Richard Purdie Signed-off-by: Bryan Wu --- drivers/leds/led-class.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'drivers/leds/led-class.c') diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c index 65722deb8d28..dbeebac38d31 100644 --- a/drivers/leds/led-class.c +++ b/drivers/leds/led-class.c @@ -55,7 +55,7 @@ static ssize_t brightness_store(struct device *dev, 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 @@ static void led_timer_function(unsigned long data) 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 @@ static void led_timer_function(unsigned long data) 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 @@ static void set_brightness_delayed(struct work_struct *ws) 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 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) 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); -- cgit v1.2.3