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#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,

};