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backlight: add backlight type

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There may be multiple ways of controlling the backlight on a given
machine.  Allow drivers to expose the type of interface they are
providing, making it possible for userspace to make appropriate policy
decisions.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: David Airlie <airlied@linux.ie>
Cc: Alex Deucher <alexdeucher@gmail.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Garrett 2011-03-22 16:30:21 -07:00 • committed by Linus Torvalds
parent ccd7510fd8
commit bb7ca747f8
59 changed files with 111 additions and 2 deletions
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9
include/linux/backlight.h
View file

@ -32,6 +32,13 @@ enum backlight_update_reason {
BACKLIGHT_UPDATE_SYSFS,
};
enum backlight_type {
BACKLIGHT_RAW = 1,
BACKLIGHT_PLATFORM,
BACKLIGHT_FIRMWARE,
BACKLIGHT_TYPE_MAX,
};
struct backlight_device;
struct fb_info;
@ -62,6 +69,8 @@ struct backlight_properties {
/* FB Blanking active? (values as for power) */
/* Due to be removed, please use (state & BL_CORE_FBBLANK) */
int fb_blank;
/* Backlight type */
enum backlight_type type;
/* Flags used to signal drivers of state changes */
/* Upper 4 bits are reserved for driver internal use */
unsigned int state;