1 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 0b5897446dca..c7d6b2e8c3b5 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -46,6 +46,12 @@ enum backlight_notification {
         BACKLIGHT_UNREGISTERED,
 };
 
+enum backlight_scale {
+        BACKLIGHT_SCALE_UNKNOWN = 0,
+        BACKLIGHT_SCALE_LINEAR,
+        BACKLIGHT_SCALE_NON_LINEAR,
+};
+
 struct backlight_device;
 struct fb_info;
 
@@ -80,6 +86,8 @@ struct backlight_properties {
         enum backlight_type type;
         /* Flags used to signal drivers of state changes */
         unsigned int state;
+        /* Type of the brightness scale (linear, non-linear, ...) */
+        enum backlight_scale scale;
 
 #define BL_CORE_SUSPENDED       (1 << 0)        /* backlight is suspended */
 #define BL_CORE_FBBLANK         (1 << 1)        /* backlight is under an fb blank event */