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Commit faa312da authored by Eric Miao's avatar Eric Miao Committed by Russell King
Browse files

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: default avatarEric Miao <eric.miao@marvell.com>
Acked-by: default avatarKrzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 6ae19b04

drivers/video/backlight/lcd.c

+15 −3
Original line number Diff line number Diff line
@@ -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;

}

drivers/video/fbmem.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

			}

		}

include/linux/lcd.h

+3 −0
Original line number Diff line number Diff line
@@ -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 *);