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[PATCH] LED: add LED class

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Add the foundations of a new LEDs subsystem.  This patch adds a class which
presents LED devices within sysfs and allows their brightness to be
controlled.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Richard Purdie
2006-03-31 02:31:04 -08:00
committed by Linus Torvalds
parent 75c1d31d9e
commit c72a1d608d
9 changed files with 281 additions and 0 deletions
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51
include/linux/leds.h Normal file
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/*
* Driver model for leds and led triggers
*
* Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
* Copyright (C) 2005 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 __LINUX_LEDS_H_INCLUDED
#define __LINUX_LEDS_H_INCLUDED
struct device;
struct class_device;
/*
* LED Core
*/
enum led_brightness {
LED_OFF = 0,
LED_HALF = 127,
LED_FULL = 255,
};
struct led_classdev {
const char *name;
int brightness;
int flags;
#define LED_SUSPENDED (1 << 0)
/* A function to set the brightness of the led */
void (*brightness_set)(struct led_classdev *led_cdev,
enum led_brightness brightness);
struct class_device *class_dev;
/* LED Device linked list */
struct list_head node;
/* Trigger data */
char *default_trigger;
};
extern int led_classdev_register(struct device *parent,
struct led_classdev *led_cdev);
extern void led_classdev_unregister(struct led_classdev *led_cdev);
extern void led_classdev_suspend(struct led_classdev *led_cdev);
extern void led_classdev_resume(struct led_classdev *led_cdev);
#endif /* __LINUX_LEDS_H_INCLUDED */