diff options
| author | Richard Purdie <rpurdie@rpsys.net> | 2007-02-10 14:10:33 +0000 |
|---|---|---|
| committer | Richard Purdie <rpurdie@rpsys.net> | 2007-02-20 08:38:46 +0000 |
| commit | 37ce69a57ff217a4ca0871e9ee5aa58c052b7d86 (patch) | |
| tree | 21cdbb8c988eed585437bb502ca15c2998ea7fbc /drivers/video/fbsysfs.c | |
| parent | b5c6916b3118d4301dc2f8cf8d33f13e5324a3a5 (diff) | |
| download | linux-3.10-37ce69a57ff217a4ca0871e9ee5aa58c052b7d86.tar.gz linux-3.10-37ce69a57ff217a4ca0871e9ee5aa58c052b7d86.tar.bz2 linux-3.10-37ce69a57ff217a4ca0871e9ee5aa58c052b7d86.zip | |
backlight: Rework backlight/fb interaction simplifying, lots
fb_info->bl_mutex is badly thought out and the backlight class doesn't
need it if the framebuffer/backlight register/unregister order is
consistent, particularly after the backlight locking fixes.
Fix the drivers to use the order:
backlight_device_register()
register_framebuffer()
unregister_framebuffer()
backlight_device_unregister()
and turn bl_mutex into a lock for the bl_curve data only.
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Diffstat (limited to 'drivers/video/fbsysfs.c')
| -rw-r--r-- | drivers/video/fbsysfs.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/video/fbsysfs.c b/drivers/video/fbsysfs.c index 818fb09105f..40c80c8190e 100644 --- a/drivers/video/fbsysfs.c +++ b/drivers/video/fbsysfs.c @@ -59,7 +59,7 @@ struct fb_info *framebuffer_alloc(size_t size, struct device *dev) info->device = dev; #ifdef CONFIG_FB_BACKLIGHT - mutex_init(&info->bl_mutex); + mutex_init(&info->bl_curve_mutex); #endif return info; @@ -445,10 +445,10 @@ static ssize_t store_bl_curve(struct device *device, /* If there has been an error in the input data, we won't * reach this loop. */ - mutex_lock(&fb_info->bl_mutex); + mutex_lock(&fb_info->bl_curve_mutex); for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i) fb_info->bl_curve[i] = tmp_curve[i]; - mutex_unlock(&fb_info->bl_mutex); + mutex_unlock(&fb_info->bl_curve_mutex); return count; } @@ -466,7 +466,7 @@ static ssize_t show_bl_curve(struct device *device, if (!fb_info || !fb_info->bl_dev) return -ENODEV; - mutex_lock(&fb_info->bl_mutex); + mutex_lock(&fb_info->bl_curve_mutex); for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8) len += snprintf(&buf[len], PAGE_SIZE, "%02x %02x %02x %02x %02x %02x %02x %02x\n", @@ -478,7 +478,7 @@ static ssize_t show_bl_curve(struct device *device, fb_info->bl_curve[i + 5], fb_info->bl_curve[i + 6], fb_info->bl_curve[i + 7]); - mutex_unlock(&fb_info->bl_mutex); + mutex_unlock(&fb_info->bl_curve_mutex); return len; } @@ -552,6 +552,8 @@ void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max) { unsigned int i, flat, count, range = (max - min); + mutex_lock(&fb_info->bl_curve_mutex); + fb_info->bl_curve[0] = off; for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat) @@ -560,6 +562,8 @@ void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max) count = FB_BACKLIGHT_LEVELS * 15 / 16; for (i = 0; i < count; ++i) fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count); + + mutex_unlock(&fb_info->bl_curve_mutex); } EXPORT_SYMBOL_GPL(fb_bl_default_curve); #endif |