From mboxrd@z Thu Jan 1 00:00:00 1970 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 Message-ID: <1440081846-11697-5-git-send-email-j.anaszewski@samsung.com> References: <1440081846-11697-1-git-send-email-j.anaszewski@samsung.com> Return-path: In-reply-to: <1440081846-11697-1-git-send-email-j.anaszewski@samsung.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jacek Anaszewski , Andrew Lunn , Sakari Ailus , Pavel Machek , Stas Sergeev List-Id: linux-leds@vger.kernel.org This patch adds led_set_brightness_nosleep function. It guarantees setting LED brightness in a non-blocking way. Signed-off-by: Jacek Anaszewski Cc: Andrew Lunn Cc: Sakari Ailus Cc: Pavel Machek Cc: Stas Sergeev --- 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 + * Author: Jacek Anaszewski * * 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