backlight: Add suspend/resume support to the backlight core

Add suspend/resume support to the backlight core and enable use of it
by appropriate drivers.

Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 1ee9488ca2e4..79ca2da81c87 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -31,6 +31,10 @@ struct backlight_device;
 struct fb_info;
 
 struct backlight_ops {
+        unsigned int options;
+
+#define BL_CORE_SUSPENDRESUME   (1 << 0)
+
         /* Notify the backlight driver some property has changed */
         int (*update_status)(struct backlight_device *);
         /* Return the current backlight brightness (accounting for power,
@@ -51,7 +55,19 @@ struct backlight_properties {
            modes; 4: full off), see FB_BLANK_XXX */
         int power;
         /* FB Blanking active? (values as for power) */
+        /* Due to be removed, please use (state & BL_CORE_FBBLANK) */
         int fb_blank;
+        /* Flags used to signal drivers of state changes */
+        /* Upper 4 bits are reserved for driver internal use */
+        unsigned int state;
+
+#define BL_CORE_SUSPENDED       (1 << 0)        /* backlight is suspended */
+#define BL_CORE_FBBLANK         (1 << 1)        /* backlight is under an fb blank event */
+#define BL_CORE_DRIVER4         (1 << 28)       /* reserved for driver specific use */
+#define BL_CORE_DRIVER3         (1 << 29)       /* reserved for driver specific use */
+#define BL_CORE_DRIVER2         (1 << 30)       /* reserved for driver specific use */
+#define BL_CORE_DRIVER1         (1 << 31)       /* reserved for driver specific use */
+
 };
 
 struct backlight_device {