summaryrefslogtreecommitdiff
path: root/Documentation/DocBook/media
diff options
context:
space:
mode:
authorSylwester Nawrocki <s.nawrocki@samsung.com>2012-05-02 13:24:33 +0400
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-05-14 21:29:35 +0400
commitfc162a099e7b34bfe3501028c919ff5d43e5e3d3 (patch)
treeed3e60fe068ad65c5a8846c110852d86582095f8 /Documentation/DocBook/media
parent0bf6b7dc5fd1e60e93657d4fe4b3d788216b9d5e (diff)
downloadlinux-fc162a099e7b34bfe3501028c919ff5d43e5e3d3.tar.xz
[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>
Diffstat (limited to 'Documentation/DocBook/media')
-rw-r--r--Documentation/DocBook/media/v4l/controls.xml39
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>