kolibrios-gitea/drivers/include/linux/backlight.h

/*
 * Backlight Lowlevel Control Abstraction
 *
 * Copyright (C) 2003,2004 Hewlett-Packard Company
 *
 */

#ifndef _LINUX_BACKLIGHT_H
#define _LINUX_BACKLIGHT_H

#include <linux/device.h>
#include <linux/fb.h>
#include <linux/mutex.h>
#include <linux/notifier.h>

/* Notes on locking:
 *
 * backlight_device->ops_lock is an internal backlight lock protecting the
 * ops pointer and no code outside the core should need to touch it.
 *
 * Access to update_status() is serialised by the update_lock mutex since
 * most drivers seem to need this and historically get it wrong.
 *
 * Most drivers don't need locking on their get_brightness() method.
 * If yours does, you need to implement it in the driver. You can use the
 * update_lock mutex if appropriate.
 *
 * Any other use of the locks below is probably wrong.
 */

enum backlight_update_reason {
	BACKLIGHT_UPDATE_HOTKEY,
	BACKLIGHT_UPDATE_SYSFS,
};

enum backlight_type {
	BACKLIGHT_RAW = 1,
	BACKLIGHT_PLATFORM,
	BACKLIGHT_FIRMWARE,
	BACKLIGHT_TYPE_MAX,
};

enum backlight_notification {
	BACKLIGHT_REGISTERED,
	BACKLIGHT_UNREGISTERED,
};

struct backlight_device;
struct fb_info;
#endif