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backlight: Match backlight device against struct fb_info.bl_dev

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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>
This commit is contained in:
Thomas Zimmermann
2024-03-05 17:22:34 +01:00
committed by Lee Jones
parent 4cece76496
commit e6c6fea5c3
3 changed files with 21 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/linux/fb.h
+9
View File
@@ -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