fbdev: add events for early fb event support

Add FB_EARLY_EVENT_BLANK and FB_R_EARLY_EVENT_BLANK event mode supports.
first, fb_notifier_call_chain() is called with FB_EARLY_EVENT_BLANK and
fb_blank() of specific fb driver is called and then
fb_notifier_call_chain() is called with FB_EVENT_BLANK again at
fb_blank().  and if fb_blank() was failed then fb_nitifier_call_chain()
would be called with FB_R_EARLY_EVENT_BLANK to revert the previous
effects.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index c6ce416..0dff12a 100644 (file)
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1046,20 +1046,29 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 int
 fb_blank(struct fb_info *info, int blank)
 {      
-       int ret = -EINVAL;
+       struct fb_event event;
+       int ret = -EINVAL, early_ret;
 
        if (blank > FB_BLANK_POWERDOWN)
                blank = FB_BLANK_POWERDOWN;
 
+       event.info = info;
+       event.data = ␣
+
+       early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
+
        if (info->fbops->fb_blank)
                ret = info->fbops->fb_blank(blank, info);
 
-       if (!ret) {
-               struct fb_event event;
-
-               event.info = info;
-               event.data = ␣
+       if (!ret)
                fb_notifier_call_chain(FB_EVENT_BLANK, &event);
+       else {
+               /*
+                * if fb_blank is failed then revert effects of
+                * the early blank event.
+                */
+               if (!early_ret)
+                       fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
        }
 
        return ret;

diff --git a/include/linux/fb.h b/include/linux/fb.h
index d31cb68..a3229d7 100644 (file)
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -554,6 +554,10 @@ struct fb_cursor_user {
 #define FB_EVENT_FB_UNBIND              0x0E
 /*      CONSOLE-SPECIFIC: remap all consoles to new fb - for vga switcheroo */
 #define FB_EVENT_REMAP_ALL_CONSOLE      0x0F
+/*      A hardware display blank early change occured */
+#define FB_EARLY_EVENT_BLANK           0x10
+/*      A hardware display blank revert early change occured */
+#define FB_R_EARLY_EVENT_BLANK         0x11
 
 struct fb_event {
        struct fb_info *info;