backlight/fbcon: Add FB_EVENT_CONBLANK

The backlight class wants notification whenever the console is blanked
but doesn't get this when hardware blanking fails and software blanking
is used. Changing FB_EVENT_BLANK to report both would be a behaviour
change which could confuse the console layer so add a new event for
software blanking and have the backlight class listen for both.

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

3 files changed, 11 insertions, 2 deletions

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 4f987c40b72d..5490b2ae5134 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -28,7 +28,7 @@ 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)
+        if (event != FB_EVENT_BLANK && event != FB_EVENT_CONBLANK)
                 return 0;
 
         bd = container_of(self, struct backlight_device, fb_notif);
diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
index be3f2c3f132c..0429fd2cece0 100644
--- a/drivers/video/console/fbcon.c
+++ b/drivers/video/console/fbcon.c
@@ -2233,6 +2233,8 @@ static int fbcon_switch(struct vc_data *vc)
 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
                                 int blank)
 {
+        struct fb_event event;
+
         if (blank) {
                 unsigned short charmask = vc->vc_hi_font_mask ?
                         0x1ff : 0xff;
@@ -2243,6 +2245,11 @@ static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
                 fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
                 vc->vc_video_erase_char = oldc;
         }
+
+
+        event.info = info;
+        event.data = ␣
+        fb_notifier_call_chain(FB_EVENT_CONBLANK, &event);
 }
 
 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
diff --git a/include/linux/fb.h b/include/linux/fb.h
index a78e25683f82..bf7158b59b25 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -516,13 +516,15 @@ struct fb_cursor_user {
 #define FB_EVENT_GET_CONSOLE_MAP        0x07
 /*      CONSOLE-SPECIFIC: set console to framebuffer mapping */
 #define FB_EVENT_SET_CONSOLE_MAP        0x08
-/*      A display blank is requested       */
+/*      A hardware display blank change occured */
 #define FB_EVENT_BLANK                  0x09
 /*      Private modelist is to be replaced */
 #define FB_EVENT_NEW_MODELIST           0x0A
 /*      The resolution of the passed in fb_info about to change and
         all vc's should be changed         */
 #define FB_EVENT_MODE_CHANGE_ALL        0x0B
+/*      A software display blank change occured */
+#define FB_EVENT_CONBLANK               0x0C
 
 struct fb_event {
         struct fb_info *info;