Messages in this thread Patch in this message | | | From | Jacek Anaszewski <> | Subject | [PATCH/RFC v6 04/36] leds: Add an internal led_set_brightness_nosleep function | Date | Thu, 20 Aug 2015 16:43:34 +0200 |
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This patch adds led_set_brightness_nosleep function. It guarantees setting LED brightness in a non-blocking way.
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Sakari Ailus <sakari.ailus@linux.intel.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: Stas Sergeev <stsp@users.sourceforge.net> --- 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 <rpurdie@openedhand.com> + * Author: Jacek Anaszewski <j.anaszewski@samsung.com> * * 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
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