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43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
/*
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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
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/* 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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#endif
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