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[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>
This commit is contained in:
Sylwester Nawrocki 2012-05-02 06:24:33 -03:00 committed by Mauro Carvalho Chehab
parent 0bf6b7dc5f
commit fc162a099e
3 changed files with 46 additions and 0 deletions
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39
Documentation/DocBook/media/v4l/controls.xml
View File

@ -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>

2
drivers/media/video/v4l2-ctrls.c
View File

@ -661,6 +661,7 @@ const char *v4l2_ctrl_get_name(u32 id)
case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
case V4L2_CID_SCENE_MODE: return "Scene Mode";
case V4L2_CID_3A_LOCK: return "3A Lock";
/* FM Radio Modulator control */
/* Keep the order of the 'case's the same as in videodev2.h! */
@ -849,6 +850,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
break;
case V4L2_CID_FLASH_FAULT:
case V4L2_CID_JPEG_ACTIVE_MARKER:
case V4L2_CID_3A_LOCK:
*type = V4L2_CTRL_TYPE_BITMASK;
break;
case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:

5
include/linux/videodev2.h
View File

@ -1758,6 +1758,11 @@ enum v4l2_scene_mode {
V4L2_SCENE_MODE_TEXT = 13,
};
#define V4L2_CID_3A_LOCK (V4L2_CID_CAMERA_CLASS_BASE+27)
#define V4L2_LOCK_EXPOSURE (1 << 0)
#define V4L2_LOCK_WHITE_BALANCE (1 << 1)
#define V4L2_LOCK_FOCUS (1 << 2)
/* 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)