Add V4L2_CID_AUTO_EXPOSURE_BIAS control for the automatic exposure
algorithm compensation.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
Documentation/DocBook/media/v4l/controls.xml | 16 ++++++++++++++++
drivers/media/video/v4l2-ctrls.c | 4 ++++
include/linux/videodev2.h | 1 +
3 files changed, 21 insertions(+)
diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml
index 133a176..ebb4431 100644
--- a/Documentation/DocBook/media/v4l/controls.xml
+++ b/Documentation/DocBook/media/v4l/controls.xml
@@ -2775,6 +2775,22 @@ remain constant.</entry>
<row><entry></entry></row>
<row>
+ <entry spanname="id"><constant>V4L2_CID_EXPOSURE_BIAS</constant> </entry>
+ <entry>integer menu</entry>
+ </row><row><entry spanname="descr"> Determines the exposure
+compensation 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> </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 3061b89..53e56be 100644
--- a/drivers/media/video/v4l2-ctrls.c
+++ b/drivers/media/video/v4l2-ctrls.c
@@ -635,6 +635,7 @@ const char *v4l2_ctrl_get_name(u32 id)
case V4L2_CID_WHITE_BALANCE_PRESET: return "White Balance, Preset";
case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
+ 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! */
@@ -791,6 +792,9 @@ 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 9f005bc..3d7bb3d 100644
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -1730,6 +1730,7 @@ enum v4l2_white_balance_preset {
#define V4L2_CID_WIDE_DYNAMIC_RANGE (V4L2_CID_CAMERA_CLASS_BASE+31)
#define V4L2_CID_IMAGE_STABILIZATION (V4L2_CID_CAMERA_CLASS_BASE+32)
+#define V4L2_CID_AUTO_EXPOSURE_BIAS (V4L2_CID_CAMERA_CLASS_BASE+33)
/* FM Modulator class control IDs */
#define V4L2_CID_FM_TX_CLASS_BASE (V4L2_CTRL_CLASS_FM_TX | 0x900)
--
1.7.9.2
--
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