v4l2: Add a Greyworld AWB mode.

Adds a simple greyworld white balance preset, mainly for use
with cameras without an IR filter (eg Raspberry Pi NoIR)

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>

diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index c3604a0..80f82c2 100644 (file)
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -1004,6 +1004,7 @@ enum v4l2_auto_n_preset_white_balance {
        V4L2_WHITE_BALANCE_FLASH                = 7,
        V4L2_WHITE_BALANCE_CLOUDY               = 8,
        V4L2_WHITE_BALANCE_SHADE                = 9,
+       V4L2_WHITE_BALANCE_GREYWORLD            = 10,
 };
 
 #define V4L2_CID_WIDE_DYNAMIC_RANGE            (V4L2_CID_CAMERA_CLASS_BASE+21)