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linux-next/drivers/leds/leds.h
Jacek Anaszewski 4d71a4a12b leds: Add support for setting brightness in a synchronous way
There are use cases when setting a LED brightness has to
have immediate effect (e.g. setting a torch LED brightness).
This patch extends LED subsystem to support such operations.
The LED subsystem internal API __led_set_brightness is changed
to led_set_brightness_async and new led_set_brightness_sync API
is added.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
2014-11-14 14:29:35 -08:00

76 lines
2.0 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_async(struct led_classdev *led_cdev,
enum led_brightness value)
{
led_cdev->brightness = min(value, led_cdev->max_brightness);
if (!(led_cdev->flags & LED_SUSPENDED))
led_cdev->brightness_set(led_cdev, value);
}
static inline int led_set_brightness_sync(struct led_classdev *led_cdev,
enum led_brightness value)
{
int ret = 0;
led_cdev->brightness = min(value, led_cdev->max_brightness);
if (!(led_cdev->flags & LED_SUSPENDED))
ret = led_cdev->brightness_set_sync(led_cdev,
led_cdev->brightness);
return ret;
}
static inline int led_get_brightness(struct led_classdev *led_cdev)
{
return led_cdev->brightness;
}
void led_stop_software_blink(struct led_classdev *led_cdev);
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);
static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
{
return led_cdev->trigger_data;
}
#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)
#define led_get_trigger_data(x) (NULL)
#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 */