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[media] media/Documentation: New flag EXECUTE_ON_WRITE

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Document new flag V4L2_CTRL_FLAG_EXECUTE_ON_WRITE, and the new behavior
of CH_VALUE event on VOLATILE controls.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Ricardo Ribalda
2015-03-20 11:13:14 -03:00
committed by Mauro Carvalho Chehab
parent 45f014c526
commit acd2b672b4
3 changed files with 17 additions and 5 deletions
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4
Documentation/video4linux/v4l2-controls.txt
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@@ -344,7 +344,9 @@ implement g_volatile_ctrl like this:
}
Note that you use the 'new value' union as well in g_volatile_ctrl. In general
controls that need to implement g_volatile_ctrl are read-only controls.
controls that need to implement g_volatile_ctrl are read-only controls. If they
are not, a V4L2_EVENT_CTRL_CH_VALUE will not be generated when the control
changes.
To mark a control as volatile you have to set V4L2_CTRL_FLAG_VOLATILE: