[PATCH] Rewritten backlight infrastructure for portable Apple computers
This patch contains a total rewrite of the backlight infrastructure for
portable Apple computers. Backward compatibility is retained. A sysfs
interface allows userland to control the brightness with more steps than
before. Userland is allowed to upload a brightness curve for different
monitors, similar to Mac OS X.
[akpm@osdl.org: add needed exports]
Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/video/chipsfb.c b/drivers/video/chipsfb.c
index 72ff6bf..d76bbfac 100644
--- a/drivers/video/chipsfb.c
+++ b/drivers/video/chipsfb.c
@@ -148,9 +148,24 @@
static int chipsfb_blank(int blank, struct fb_info *info)
{
#ifdef CONFIG_PMAC_BACKLIGHT
- // used to disable backlight only for blank > 1, but it seems
- // useful at blank = 1 too (saves battery, extends backlight life)
- set_backlight_enable(!blank);
+ mutex_lock(&pmac_backlight_mutex);
+
+ if (pmac_backlight) {
+ down(&pmac_backlight->sem);
+
+ /* used to disable backlight only for blank > 1, but it seems
+ * useful at blank = 1 too (saves battery, extends backlight
+ * life)
+ */
+ if (blank)
+ pmac_backlight->props->power = FB_BLANK_POWERDOWN;
+ else
+ pmac_backlight->props->power = FB_BLANK_UNBLANK;
+ pmac_backlight->props->update_status(pmac_backlight);
+ up(&pmac_backlight->sem);
+ }
+
+ mutex_unlock(&pmac_backlight_mutex);
#endif /* CONFIG_PMAC_BACKLIGHT */
return 1; /* get fb_blank to set the colormap to all black */
@@ -401,7 +416,14 @@
#ifdef CONFIG_PMAC_BACKLIGHT
/* turn on the backlight */
- set_backlight_enable(1);
+ mutex_lock(&pmac_backlight_mutex);
+ if (pmac_backlight) {
+ down(&pmac_backlight->sem);
+ pmac_backlight->props->power = FB_BLANK_UNBLANK;
+ pmac_backlight->props->update_status(pmac_backlight);
+ up(&pmac_backlight->sem);
+ }
+ mutex_unlock(&pmac_backlight_mutex);
#endif /* CONFIG_PMAC_BACKLIGHT */
#ifdef CONFIG_PPC