diff options
author | Thomas Zimmermann <tzimmermann@suse.de> | 2024-03-05 19:22:34 +0300 |
---|---|---|
committer | Lee Jones <lee@kernel.org> | 2024-03-28 13:08:47 +0300 |
commit | e6c6fea5c314d90dbfca4983f2ea46388aab3bb0 (patch) | |
tree | 0da6b01227e9bc5d55be24dc751b1c5a6669233b /drivers/video/fbdev | |
parent | 4cece764965020c22cff7665b18a012006359095 (diff) | |
download | linux-e6c6fea5c314d90dbfca4983f2ea46388aab3bb0.tar.xz |
backlight: Match backlight device against struct fb_info.bl_dev
Framebuffer drivers for devices with dedicated backlight are supposed
to set struct fb_info.bl_dev to the backlight's respective device. Use
the value to match backlight and framebuffer in the backlight core code.
The code first tests against struct backlight_ops.check_ops. If this
test succeeds, it performs the test against fbdev. So backlight drivers
can override the later test as before.
Fbdev's backlight support depends on CONFIG_FB_BACKLIGHT. To avoid
ifdef in the code, the new helper fb_bl_device() returns the backlight
device, or NULL if the config option has been disabled. The test in
the backlight code will then do nothing.
v4:
* declare empty fb_bl_device() as static inline
* export fb_bl_device()
v3:
* hide ifdef in fb_bl_device() (Lee)
* no if-else blocks (Andy)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20240305162425.23845-2-tzimmermann@suse.de
Signed-off-by: Lee Jones <lee@kernel.org>
Diffstat (limited to 'drivers/video/fbdev')
-rw-r--r-- | drivers/video/fbdev/core/fb_backlight.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/video/fbdev/core/fb_backlight.c b/drivers/video/fbdev/core/fb_backlight.c index e2d3b3adc870..6fdaa9f81be9 100644 --- a/drivers/video/fbdev/core/fb_backlight.c +++ b/drivers/video/fbdev/core/fb_backlight.c @@ -30,4 +30,10 @@ void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max) mutex_unlock(&fb_info->bl_curve_mutex); } EXPORT_SYMBOL_GPL(fb_bl_default_curve); + +struct backlight_device *fb_bl_device(struct fb_info *info) +{ + return info->bl_dev; +} +EXPORT_SYMBOL(fb_bl_device); #endif |