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[media] v4l: Add camera pan/tilt speed controls 

The V4L2_CID_PAN_SPEED and V4L2_CID_TILT_SPEED controls allow to move the
camera by setting its rotation speed around its axis.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Pawel Osciak <posciak@chromium.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Vincent Palatin 2014-09-03 16:38:39 -03:00 committed by Mauro Carvalho Chehab
parent 7000e325de
commit e3d6eb1c16
4 changed files with 35 additions and 0 deletions
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10
Documentation/DocBook/media/v4l/compat.xml
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@ -2545,6 +2545,16 @@ fields changed from _s32 to _u32.
</orderedlist>
</section>
<section>
<title>V4L2 in Linux 3.18</title>
<orderedlist>
<listitem>
<para>Added <constant>V4L2_CID_PAN_SPEED</constant> and
<constant>V4L2_CID_TILT_SPEED</constant> camera controls.</para>
</listitem>
</orderedlist>
</section>
<section id="other">
<title>Relation of V4L2 to other Linux multimedia APIs</title>

21
Documentation/DocBook/media/v4l/controls.xml
View File

@ -3965,6 +3965,27 @@ by exposure, white balance or focus controls.</entry>
</row>
<row><entry></entry></row>
<row>
<entry spanname="id"><constant>V4L2_CID_PAN_SPEED</constant>&nbsp;</entry>
<entry>integer</entry>
</row><row><entry spanname="descr">This control turns the
camera horizontally at the specific speed. The unit is undefined. A
positive value moves the camera to the right (clockwise when viewed
from above), a negative value to the left. A value of zero stops the motion
if one is in progress and has no effect otherwise.</entry>
</row>
<row><entry></entry></row>
<row>
<entry spanname="id"><constant>V4L2_CID_TILT_SPEED</constant>&nbsp;</entry>
<entry>integer</entry>
</row><row><entry spanname="descr">This control turns the
camera vertically at the specified speed. The unit is undefined. A
positive value moves the camera up, a negative value down. A value of zero
stops the motion if one is in progress and has no effect otherwise.</entry>
</row>
<row><entry></entry></row>
</tbody>
</tgroup>
</table>

2
drivers/media/v4l2-core/v4l2-ctrls.c
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@ -796,6 +796,8 @@ const char *v4l2_ctrl_get_name(u32 id)
case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
case V4L2_CID_PAN_SPEED: return "Pan, Speed";
case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
/* FM Radio Modulator controls */
/* Keep the order of the 'case's the same as in v4l2-controls.h! */

2
include/uapi/linux/v4l2-controls.h
View File

@ -746,6 +746,8 @@ enum v4l2_auto_focus_range {
V4L2_AUTO_FOCUS_RANGE_INFINITY = 3,
};
#define V4L2_CID_PAN_SPEED (V4L2_CID_CAMERA_CLASS_BASE+32)
#define V4L2_CID_TILT_SPEED (V4L2_CID_CAMERA_CLASS_BASE+33)
/* FM Modulator class control IDs */