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lcd: allow lcd device to handle mode change events 

Some LCD panels are capable of different resolutions, and is allowed
to change at run-time, so to make "struct lcd_device" to be able to
handle mode change events here.

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Acked-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
hifive-unleashed-5.1
Eric Miao 2008-08-29 04:18:43 +08:00 committed by Russell King
parent 6ae19b04ab
commit faa312da9c
3 changed files with 19 additions and 3 deletions
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18
drivers/video/backlight/lcd.c
View File

@ -27,14 +27,26 @@ static int fb_notifier_callback(struct notifier_block *self,
struct fb_event *evdata = data;
/* If we aren't interested in this event, skip it immediately ... */
if (event != FB_EVENT_BLANK)
switch (event) {
case FB_EVENT_BLANK:
case FB_EVENT_MODE_CHANGE:
case FB_EVENT_MODE_CHANGE_ALL:
break;
default:
return 0;
}
ld = container_of(self, struct lcd_device, fb_notif);
if (!ld->ops)
return 0;
mutex_lock(&ld->ops_lock);
if (ld->ops)
if (!ld->ops->check_fb || ld->ops->check_fb(ld, evdata->info))
if (!ld->ops->check_fb || ld->ops->check_fb(ld, evdata->info)) {
if (event == FB_EVENT_BLANK)
ld->ops->set_power(ld, *(int *)evdata->data);
else
ld->ops->set_mode(ld, evdata->data);
}
mutex_unlock(&ld->ops_lock);
return 0;
}

1
drivers/video/fbmem.c
View File

@ -979,6 +979,7 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
info->flags &= ~FBINFO_MISC_USEREVENT;
event.info = info;
event.data = &mode;
fb_notifier_call_chain(evnt, &event);
}
}

3
include/linux/lcd.h
View File

@ -11,6 +11,7 @@
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/fb.h>
/* Notes on locking:
*
@ -45,6 +46,8 @@ struct lcd_ops {
int (*get_contrast)(struct lcd_device *);
/* Set LCD panel contrast */
int (*set_contrast)(struct lcd_device *, int contrast);
/* Set LCD panel mode (resolutions ...) */
int (*set_mode)(struct lcd_device *, struct fb_videomode *);
/* Check if given framebuffer device is the one LCD is bound to;
return 0 if not, !=0 if it is. If NULL, lcd always matches the fb. */
int (*check_fb)(struct lcd_device *, struct fb_info *);