mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
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
/*
|
|
* LED Core
|
|
*
|
|
* Copyright 2005 Openedhand Ltd.
|
|
*
|
|
* Author: Richard Purdie <rpurdie@openedhand.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
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
#ifndef __LEDS_H_INCLUDED
|
|
#define __LEDS_H_INCLUDED
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/rwsem.h>
|
|
#include <linux/leds.h>
|
|
|
|
static inline void led_set_brightness(struct led_classdev *led_cdev,
|
|
enum led_brightness value)
|
|
{
|
|
if (value > led_cdev->max_brightness)
|
|
value = led_cdev->max_brightness;
|
|
led_cdev->brightness = value;
|
|
if (!(led_cdev->flags & LED_SUSPENDED))
|
|
led_cdev->brightness_set(led_cdev, value);
|
|
}
|
|
|
|
static inline int led_get_brightness(struct led_classdev *led_cdev)
|
|
{
|
|
return led_cdev->brightness;
|
|
}
|
|
|
|
extern struct rw_semaphore leds_list_lock;
|
|
extern struct list_head leds_list;
|
|
|
|
#ifdef CONFIG_LEDS_TRIGGERS
|
|
void led_trigger_set_default(struct led_classdev *led_cdev);
|
|
void led_trigger_set(struct led_classdev *led_cdev,
|
|
struct led_trigger *trigger);
|
|
void led_trigger_remove(struct led_classdev *led_cdev);
|
|
#else
|
|
#define led_trigger_set_default(x) do {} while (0)
|
|
#define led_trigger_set(x, y) do {} while (0)
|
|
#define led_trigger_remove(x) do {} while (0)
|
|
#endif
|
|
|
|
ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count);
|
|
ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf);
|
|
|
|
#endif /* __LEDS_H_INCLUDED */
|