[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>

3 files changed, 22 insertions, 0 deletions

diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml
index e2ff0f98f08d..745b611c3593 100644
--- a/Documentation/DocBook/media/v4l/controls.xml
+++ b/Documentation/DocBook/media/v4l/controls.xml
@@ -2849,6 +2849,22 @@ remain constant.</entry>
           <row><entry></entry></row>
 
           <row>
+            <entry spanname="id"><constant>V4L2_CID_EXPOSURE_BIAS</constant>&nbsp;</entry>
+            <entry>integer menu</entry>
+          </row><row><entry spanname="descr"> Determines the automatic
+exposure compensation, it is effective only when <constant>V4L2_CID_EXPOSURE_AUTO</constant>
+control is set to <constant>AUTO</constant>, <constant>SHUTTER_PRIORITY </constant>
+or <constant>APERTURE_PRIORITY</constant>.
+It is expressed in terms of EV, drivers should interpret the values as 0.001 EV
+units, where the value 1000 stands for +1 EV.
+<para>Increasing the exposure compensation value is equivalent to decreasing
+the exposure value (EV) and will increase the amount of light at the image
+sensor. The camera performs the exposure compensation by adjusting absolute
+exposure time and/or aperture.</para></entry>
+          </row>
+          <row><entry></entry></row>
+
+          <row>
             <entry spanname="id"><constant>V4L2_CID_PAN_RELATIVE</constant>&nbsp;</entry>
             <entry>integer</entry>
           </row><row><entry spanname="descr">This control turns the
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:
diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
index 07bce86f3548..dfd209816df6 100644
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -1707,6 +1707,8 @@ enum  v4l2_exposure_auto_type {
 #define V4L2_CID_IRIS_ABSOLUTE                  (V4L2_CID_CAMERA_CLASS_BASE+17)
 #define V4L2_CID_IRIS_RELATIVE                  (V4L2_CID_CAMERA_CLASS_BASE+18)
 
+#define V4L2_CID_AUTO_EXPOSURE_BIAS             (V4L2_CID_CAMERA_CLASS_BASE+19)
+
 /* FM Modulator class control IDs */
 #define V4L2_CID_FM_TX_CLASS_BASE               (V4L2_CTRL_CLASS_FM_TX | 0x900)
 #define V4L2_CID_FM_TX_CLASS                    (V4L2_CTRL_CLASS_FM_TX | 1)