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authorRichard Purdie <rpurdie@rpsys.net>2006-03-31 05:31:49 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-31 15:19:00 -0500
commit6ca017658b1f902c9bba2cc1017e301581f7728d (patch)
tree9180b3923d4f6ef09c11d7f7386024f391508759 /include/linux/backlight.h
parent9b0e1c5dd2941aec566047e10a5cc929ca7f7d4f (diff)
[PATCH] backlight: Backlight Class Improvements
Backlight class attributes are currently easy to implement incorrectly. Moving certain handling into the backlight core prevents this whilst at the same time makes the drivers simpler and consistent. The following changes are included: The brightness attribute only sets and reads the brightness variable in the backlight_properties structure. The power attribute only sets and reads the power variable in the backlight_properties structure. Any framebuffer blanking events change a variable fb_blank in the backlight_properties structure. The backlight driver has only two functions to implement. One function is called when any of the above properties change (to update the backlight brightness), the second is called to return the current backlight brightness value. A new attribute "actual_brightness" is added to return this brightness as determined by the driver having combined all the above factors (and any driver/device specific factors). Additionally, the backlight core takes care of checking the maximum brightness is not exceeded and of turning off the backlight before device removal. The corgi backlight driver is updated to reflect these changes. Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/backlight.h')
-rw-r--r--include/linux/backlight.h25
1 files changed, 15 insertions, 10 deletions
diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index bb9e54322322..75e91f5b6a04 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -19,20 +19,25 @@ struct fb_info;
19struct backlight_properties { 19struct backlight_properties {
20 /* Owner module */ 20 /* Owner module */
21 struct module *owner; 21 struct module *owner;
22 /* Get the backlight power status (0: full on, 1..3: power saving 22
23 modes; 4: full off), see FB_BLANK_XXX */ 23 /* Notify the backlight driver some property has changed */
24 int (*get_power)(struct backlight_device *); 24 int (*update_status)(struct backlight_device *);
25 /* Enable or disable power to the LCD (0: on; 4: off, see FB_BLANK_XXX) */ 25 /* Return the current backlight brightness (accounting for power,
26 int (*set_power)(struct backlight_device *, int power); 26 fb_blank etc.) */
27 /* Maximal value for brightness (read-only) */
28 int max_brightness;
29 /* Get current backlight brightness */
30 int (*get_brightness)(struct backlight_device *); 27 int (*get_brightness)(struct backlight_device *);
31 /* Set backlight brightness (0..max_brightness) */
32 int (*set_brightness)(struct backlight_device *, int brightness);
33 /* Check if given framebuffer device is the one bound to this backlight; 28 /* Check if given framebuffer device is the one bound to this backlight;
34 return 0 if not, !=0 if it is. If NULL, backlight always matches the fb. */ 29 return 0 if not, !=0 if it is. If NULL, backlight always matches the fb. */
35 int (*check_fb)(struct fb_info *); 30 int (*check_fb)(struct fb_info *);
31
32 /* Current User requested brightness (0 - max_brightness) */
33 int brightness;
34 /* Maximal value for brightness (read-only) */
35 int max_brightness;
36 /* Current FB Power mode (0: full on, 1..3: power saving
37 modes; 4: full off), see FB_BLANK_XXX */
38 int power;
39 /* FB Blanking active? (values as for power) */
40 int fb_blank;
36}; 41};
37 42
38struct backlight_device { 43struct backlight_device {