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backlight: lcd: Test against struct fb_info.lcd_dev

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Add struct fb_info.lcd_dev for fbdev drivers to store a reference to
their lcd device. Update the lcd's fb_notifier_callback() to test for
this field. The lcd module can now detect if an lcd device belongs to
an fbdev device.

This works similar to the bl_dev for backlights and will allow for
the removal of the check_fb callback from several fbdev driver's lcd
devices.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20240906075439.98476-3-tzimmermann@suse.de
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Thomas Zimmermann 2024-09-06 09:52:16 +02:00 committed by Lee Jones
parent d36870367c
commit 26228256b7
2 changed files with 16 additions and 0 deletions
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3
drivers/video/backlight/lcd.c
View File

@ -30,6 +30,7 @@ static int fb_notifier_callback(struct notifier_block *self,
struct lcd_device *ld = container_of(self, struct lcd_device, fb_notif);
struct fb_event *evdata = data;
struct fb_info *info = evdata->info;
struct lcd_device *fb_lcd = fb_lcd_device(info);
guard(mutex)(&ld->ops_lock);
@ -37,6 +38,8 @@ static int fb_notifier_callback(struct notifier_block *self,
return 0;
if (ld->ops->check_fb && !ld->ops->check_fb(ld, info))
return 0;
if (fb_lcd && fb_lcd != ld)
return 0;
if (event == FB_EVENT_BLANK) {
if (ld->ops->set_power)

13
include/linux/fb.h
View File

@ -21,6 +21,7 @@ struct fb_info;
struct file;
struct i2c_adapter;
struct inode;
struct lcd_device;
struct module;
struct notifier_block;
struct page;
@ -480,6 +481,13 @@ struct fb_info {
struct mutex bl_curve_mutex;
u8 bl_curve[FB_BACKLIGHT_LEVELS];
#endif
/*
* Assigned LCD device; set before framebuffer
* registration, remove after unregister
*/
struct lcd_device *lcd_dev;
#ifdef CONFIG_FB_DEFERRED_IO
struct delayed_work deferred_work;
unsigned long npagerefs;
@ -754,6 +762,11 @@ static inline struct backlight_device *fb_bl_device(struct fb_info *info)
}
#endif
static inline struct lcd_device *fb_lcd_device(struct fb_info *info)
{
return info->lcd_dev;
}
/* fbmon.c */
#define FB_MAXTIMINGS 0
#define FB_VSYNCTIMINGS 1