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3120 serge 1 
/*
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 * Backlight Lowlevel Control Abstraction
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 *
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 * Copyright (C) 2003,2004 Hewlett-Packard Company
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 *
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 */
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#ifndef _LINUX_BACKLIGHT_H
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#define _LINUX_BACKLIGHT_H
5056 serge 10 
/* Notes on locking:
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 *
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 * backlight_device->ops_lock is an internal backlight lock protecting the
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 * ops pointer and no code outside the core should need to touch it.
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 *
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 * Access to update_status() is serialised by the update_lock mutex since
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 * most drivers seem to need this and historically get it wrong.
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 *
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 * Most drivers don't need locking on their get_brightness() method.
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 * If yours does, you need to implement it in the driver. You can use the
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 * update_lock mutex if appropriate.
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 *
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 * Any other use of the locks below is probably wrong.
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 */
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enum backlight_update_reason {
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	BACKLIGHT_UPDATE_HOTKEY,
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	BACKLIGHT_UPDATE_SYSFS,
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};
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enum backlight_type {
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	BACKLIGHT_RAW = 1,
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	BACKLIGHT_PLATFORM,
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	BACKLIGHT_FIRMWARE,
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	BACKLIGHT_TYPE_MAX,
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};
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enum backlight_notification {
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	BACKLIGHT_REGISTERED,
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	BACKLIGHT_UNREGISTERED,
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};
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3120 serge 42 
#endif