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>
diff --git a/drivers/video/backlight/lcd.c b/drivers/video/backlight/lcd.c
index b15b2b8..8e1731d 100644
--- a/drivers/video/backlight/lcd.c
+++ b/drivers/video/backlight/lcd.c
@@ -27,14 +27,26 @@
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;
}
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 98843c2..0737570 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -979,6 +979,7 @@
info->flags &= ~FBINFO_MISC_USEREVENT;
event.info = info;
+ event.data = &mode;
fb_notifier_call_chain(evnt, &event);
}
}
diff --git a/include/linux/lcd.h b/include/linux/lcd.h
index 173feba..c67feca 100644
--- a/include/linux/lcd.h
+++ b/include/linux/lcd.h
@@ -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 @@
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 *);