[PATCH v2 2/2] fb: add events for early fb event support.

[Inki Dae <inki.dae@samsung.com>]

this patch adds 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>
---
 drivers/video/fbmem.c |   21 +++++++++++++++------
 include/linux/fb.h    |    4 ++++
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index ad93629..a2bd17b 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1032,20 +1032,29 @@ 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 = &blank;
+
+	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 = &blank;
+	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 < 0)
+			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 1d6836c..29f53d5 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -549,6 +549,10 @@ 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;
-- 
1.7.4.1