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kolibrios/drivers/include/linux/backlight.h
Sergey Semyonov (Serge) 0ede580d2f ddk: 3.17-rc1
git-svn-id: svn://kolibrios.org@5056 a494cfbc-eb01-0410-851d-a64ba20cac60
2014-08-23 10:29:27 +00:00

43 lines
1.0 KiB
C

/*
* Backlight Lowlevel Control Abstraction
*
* Copyright (C) 2003,2004 Hewlett-Packard Company
*
*/
#ifndef _LINUX_BACKLIGHT_H
#define _LINUX_BACKLIGHT_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,
};
#endif