fbdev: Add FB_EVENT_BLANK to notify listeners of a blanking status change

["Richard Purdie" <rpurdie@rpsys.net>]

Add FB_EVENT_BLANK to notify listeners of a blanking status change. This 
allows backlight drivers to be implemented completely separately from any 
framebuffer driver. The new blanking mode is passed in event.data.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>

--- linux-2.6.10-rc2/drivers/video/fbmem.c~fb_blank
+++ linux-2.6.10-rc2/drivers/video/fbmem.c
@@ -744,9 +744,14 @@
 fb_blank(struct fb_info *info, int blank)
 {
  int err = -EINVAL;
+ struct fb_event event;

   if (blank > FB_BLANK_POWERDOWN)
    blank = FB_BLANK_POWERDOWN;
+
+ event.info = info;
+ event.data = &blank;
+ notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);

  if (info->fbops->fb_blank)
    err = info->fbops->fb_blank(blank, info);
--- linux-2.6.10-rc2/include/linux/fb.h~fb_blank
+++ linux-2.6.10-rc2/include/linux/fb.h
@@ -488,6 +488,8 @@
 #define FB_EVENT_GET_CONSOLE_MAP        0x06
 /*      set console to framebuffer mapping */
 #define FB_EVENT_SET_CONSOLE_MAP        0x07
+/*      Blanking on the display on this fb_info has changed */
+#define FB_EVENT_BLANK                  0x08


 struct fb_event {
--- linux-2.6.10-rc2/drivers/video/console/fbcon.c~fb_blank
+++ linux-2.6.10-rc2/drivers/video/console/fbcon.c
@@ -2063,8 +2063,7 @@
    fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
    ops->cursor_flash = (!blank);

-   if (info->fbops->fb_blank)
-    ret = info->fbops->fb_blank(blank, info);
+  ret = fb_blank(info, blank);

    if (ret)
     fbcon_generic_blank(vc, info, blank);




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