[media] V4L: Add camera exposure metering control
The V4L2_CID_EXPOSURE_METERING control allows to determine
a method used by the camera for measuring the amount of light
available for automatic 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>
diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml
index 8fccfe1..e8c63e0 100644
--- a/Documentation/DocBook/media/v4l/controls.xml
+++ b/Documentation/DocBook/media/v4l/controls.xml
@@ -2864,6 +2864,35 @@
</row>
<row><entry></entry></row>
+ <row id="v4l2-exposure-metering">
+ <entry spanname="id"><constant>V4L2_CID_EXPOSURE_METERING</constant> </entry>
+ <entry>enum v4l2_exposure_metering</entry>
+ </row><row><entry spanname="descr">Determines how the camera measures
+the amount of light available for the frame exposure. Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_EXPOSURE_METERING_AVERAGE</constant> </entry>
+ <entry>Use the light information coming from the entire frame
+and average giving no weighting to any particular portion of the metered area.
+ </entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_EXPOSURE_METERING_CENTER_WEIGHTED</constant> </entry>
+ <entry>Average the light information coming from the entire frame
+giving priority to the center of the metered area.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_EXPOSURE_METERING_SPOT</constant> </entry>
+ <entry>Measure only very small area at the center of the frame.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+
<row>
<entry spanname="id"><constant>V4L2_CID_PAN_RELATIVE</constant> </entry>
<entry>integer</entry>