display: add getter for the maximum brightness of display

- The maximum brightness of display varies
  according to the driver. Thus maximum brightness
  function is added for platform to adjust all cases.

Change-Id: Iab3c2b82372b174d569487b7c85f2024185a89b5
Signed-off-by: taeyoung <ty317.kim@samsung.com>

diff --git a/hw/display.h b/hw/display.h
index a913d39..2dbdf46 100644 (file)
--- a/hw/display.h
+++ b/hw/display.h
@@ -62,7 +62,8 @@ enum display_panel_mode {
 struct display_device {
        struct hw_common common;
 
-       /* The brightness value is 0 to 100. */
+       /* Control display brightness */
+       int (*get_max_brightness)(int *brightness);
        int (*get_brightness)(int *brightness);
        int (*set_brightness)(int brightness);