diff options
| author | Thomas Zimmermann <tzimmermann@suse.de> | 2024-03-05 17:22:34 +0100 |
|---|---|---|
| committer | Lee Jones <lee@kernel.org> | 2024-03-28 10:08:47 +0000 |
| commit | e6c6fea5c314d90dbfca4983f2ea46388aab3bb0 (patch) | |
| tree | 0da6b01227e9bc5d55be24dc751b1c5a6669233b /include/linux/fb.h | |
| parent | 4cece764965020c22cff7665b18a012006359095 (diff) | |
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 'include/linux/fb.h')
| -rw-r--r-- | include/linux/fb.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/fb.h b/include/linux/fb.h index 0dd27364d56f..75c5f800467c 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -738,6 +738,15 @@ extern struct fb_info *framebuffer_alloc(size_t size, struct device *dev); extern void framebuffer_release(struct fb_info *info); extern void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max); +#if IS_ENABLED(CONFIG_FB_BACKLIGHT) +struct backlight_device *fb_bl_device(struct fb_info *info); +#else +static inline struct backlight_device *fb_bl_device(struct fb_info *info) +{ + return NULL; +} +#endif + /* fbmon.c */ #define FB_MAXTIMINGS 0 #define FB_VSYNCTIMINGS 1 |