[PATCH 03/13] fbdev: Send old blank state in FB_EVENT_BLANK

[Thomas Zimmermann <tzimmermann@xxxxxxx>]

The event FB_EVENT_BLANK sends the new blank state in the event's
data field. Also send the old state. It's an additional field in the
data array; existing receivers won't notice the difference.

The backlight subsystem currently tracks blank state per display per
backlight. That is not optional as it ties backlight code to fbdev. A
subsystem should also not track internal state of another subsystem.
With both, new and old, blank state in FB_EVENT_BLANK, the backlight
code will not require its own state tracker any longer.

Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
 drivers/video/fbdev/core/fbmem.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index f34a80c7fc3a..997f0bfcdbb6 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -343,6 +343,7 @@ int fb_blank(struct fb_info *info, int blank)
 {
 	int old_blank = info->blank;
 	struct fb_event event;
+	int data[2];
 	int ret;
 
 	if (!info->fbops->fb_blank)
@@ -351,8 +352,10 @@ int fb_blank(struct fb_info *info, int blank)
 	if (blank > FB_BLANK_POWERDOWN)
 		blank = FB_BLANK_POWERDOWN;
 
+	data[0] = blank;
+	data[1] = old_blank;
 	event.info = info;
-	event.data = &blank;
+	event.data = data;
 
 	info->blank = blank;
 
-- 
2.48.1