[media] V4L: Add camera 3A lock control

The V4L2_CID_3A_LOCK bitmask control allows applications to pause
or resume the automatic exposure, focus and wite balance adjustments.
It can be used, for example, to lock the 3A adjustments right before
a still image is captured, for pre-focus, etc.
The applications can control each of the algorithms independently,
through a corresponding control bit, if driver allows that.

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, 39 insertions, 0 deletions

diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml
index ad0d53d3ffdd..f38f06169795 100644
--- a/Documentation/DocBook/media/v4l/controls.xml
+++ b/Documentation/DocBook/media/v4l/controls.xml
@@ -3301,6 +3301,45 @@ lens-distortion correction.</entry>
           </row>
           <row><entry></entry></row>
 
+          <row>
+            <entry spanname="id"><constant>V4L2_CID_3A_LOCK</constant></entry>
+            <entry>bitmask</entry>
+          </row>
+          <row>
+            <entry spanname="descr">This control locks or unlocks the automatic
+focus, exposure and white balance. The automatic adjustments can be paused
+independently by setting the corresponding lock bit to 1. The camera then retains
+the settings until the lock bit is cleared. The following lock bits are defined:
+</entry>
+          </row>
+          <row>
+            <entrytbl spanname="descr" cols="2">
+              <tbody valign="top">
+                <row>
+                  <entry><constant>V4L2_LOCK_EXPOSURE</constant></entry>
+                  <entry>Automatic exposure adjustments lock.</entry>
+                </row>
+                <row>
+                  <entry><constant>V4L2_LOCK_WHITE_BALANCE</constant></entry>
+                  <entry>Automatic white balance adjustments lock.</entry>
+                </row>
+                <row>
+                  <entry><constant>V4L2_LOCK_FOCUS</constant></entry>
+                  <entry>Automatic focus lock.</entry>
+                </row>
+              </tbody>
+            </entrytbl>
+          </row>
+          <row><entry spanname="descr">
+When a given algorithm is not enabled, drivers should ignore requests
+to lock it and should return no error. An example might be an application
+setting bit <constant>V4L2_LOCK_WHITE_BALANCE</constant> when the
+<constant>V4L2_CID_AUTO_WHITE_BALANCE</constant> control is set to
+<constant>FALSE</constant>. The value of this control may be changed
+by exposure, white balance or focus controls.</entry>
+          </row>
+          <row><entry></entry></row>
+
         </tbody>
       </tgroup>
     </table>