This patch adds led_set_brightness_nosleep function. It guarantees setting LED brightness in a non-blocking way.
Signed-off-by: Jacek Anaszewski <[email protected]> Cc: Andrew Lunn <[email protected]> Cc: Sakari Ailus <[email protected]> Cc: Pavel Machek <[email protected]> Cc: Stas Sergeev <[email protected]> --- drivers/leds/led-core.c | 21 +++++++++++++++++++++ drivers/leds/leds.h | 4 ++++ 2 files changed, 25 insertions(+) diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c index b69271f..0200407 100644 --- a/drivers/leds/led-core.c +++ b/drivers/leds/led-core.c @@ -114,6 +114,27 @@ void led_stop_software_blink(struct led_classdev *led_cdev) } EXPORT_SYMBOL_GPL(led_stop_software_blink); +void led_set_brightness_nosleep(struct led_classdev *led_cdev, + enum led_brightness value) +{ + int ret; + + /* + * Drivers that implement brightness_set op are guaranteed + * not to sleep while setting brightness. + */ + if (led_cdev->brightness_set) { + ret = led_set_brightness_sync(led_cdev, value); + if (ret < 0) + dev_err(led_cdev->dev, + "cannot set led brightness %d\n", ret); + return; + } + + led_set_brightness_async(led_cdev, value); +} +EXPORT_SYMBOL_GPL(led_set_brightness_nosleep); + void led_set_brightness(struct led_classdev *led_cdev, enum led_brightness brightness) { diff --git a/drivers/leds/leds.h b/drivers/leds/leds.h index ca38f6a..cd251be 100644 --- a/drivers/leds/leds.h +++ b/drivers/leds/leds.h @@ -2,8 +2,10 @@ * LED Core * * Copyright 2005 Openedhand Ltd. + * Copyright 2014, 2015 Samsung Electronics Co., Ltd. * * Author: Richard Purdie <[email protected]> + * Author: Jacek Anaszewski <[email protected]> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as @@ -28,6 +30,8 @@ static inline int led_get_brightness(struct led_classdev *led_cdev) return led_cdev->brightness; } +void led_set_brightness_nosleep(struct led_classdev *led_cdev, + enum led_brightness value); void led_stop_software_blink(struct led_classdev *led_cdev); extern struct rw_semaphore leds_list_lock; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-leds" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
