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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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1bd465e6b0
This patch allows drivers to override the default maximum brightness value of 255. We take care to preserve backwards-compatibility as much as possible, so that user-space ABI doesn't change for existing drivers. LED trigger code has also been updated to use the per-LED maximum. Signed-off-by: Guennadi Liakhovetski <lg@denx.de> Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
/*
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* LED Core
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*
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* Copyright 2005 Openedhand Ltd.
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*
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* Author: Richard Purdie <rpurdie@openedhand.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#ifndef __LEDS_H_INCLUDED
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#define __LEDS_H_INCLUDED
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#include <linux/device.h>
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#include <linux/rwsem.h>
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#include <linux/leds.h>
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static inline void led_set_brightness(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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if (value > led_cdev->max_brightness)
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value = led_cdev->max_brightness;
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led_cdev->brightness = value;
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if (!(led_cdev->flags & LED_SUSPENDED))
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led_cdev->brightness_set(led_cdev, value);
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}
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static inline int led_get_brightness(struct led_classdev *led_cdev)
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{
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return led_cdev->brightness;
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}
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extern struct rw_semaphore leds_list_lock;
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extern struct list_head leds_list;
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#ifdef CONFIG_LEDS_TRIGGERS
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void led_trigger_set_default(struct led_classdev *led_cdev);
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void led_trigger_set(struct led_classdev *led_cdev,
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struct led_trigger *trigger);
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void led_trigger_remove(struct led_classdev *led_cdev);
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#else
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#define led_trigger_set_default(x) do {} while (0)
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#define led_trigger_set(x, y) do {} while (0)
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#define led_trigger_remove(x) do {} while (0)
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#endif
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ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count);
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ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
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char *buf);
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#endif /* __LEDS_H_INCLUDED */
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