[media] V4L: Add camera exposure bias control

The camera may in some conditions incorrectly determine the exposure,
and a manual automatic exposure correction may be needed. This patch
adds V4L2_CID_AUTO_EXPOSURE_BIAS control which allows to add some
offset in the automatic exposure control loop, to compensate for
frame under- or over-exposure.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/media/video/v4l2-ctrls.c b/drivers/media/video/v4l2-ctrls.c
index fdcb9e21d9d3..5bfef90e88ee 100644
--- a/drivers/media/video/v4l2-ctrls.c
+++ b/drivers/media/video/v4l2-ctrls.c
@@ -604,6 +604,7 @@ const char *v4l2_ctrl_get_name(u32 id)
         case V4L2_CID_PRIVACY:                  return "Privacy";
         case V4L2_CID_IRIS_ABSOLUTE:            return "Iris, Absolute";
         case V4L2_CID_IRIS_RELATIVE:            return "Iris, Relative";
+        case V4L2_CID_AUTO_EXPOSURE_BIAS:       return "Auto Exposure, Bias";
 
         /* FM Radio Modulator control */
         /* Keep the order of the 'case's the same as in videodev2.h! */
@@ -760,6 +761,9 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
         case V4L2_CID_RDS_TX_RADIO_TEXT:
                 *type = V4L2_CTRL_TYPE_STRING;
                 break;
+        case V4L2_CID_AUTO_EXPOSURE_BIAS:
+                *type = V4L2_CTRL_TYPE_INTEGER_MENU;
+                break;
         case V4L2_CID_USER_CLASS:
         case V4L2_CID_CAMERA_CLASS:
         case V4L2_CID_MPEG_CLASS: