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| author | Ricardo Ribalda <ricardo.ribalda@gmail.com> | 2015-03-20 17:13:14 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-04-08 12:35:16 +0300 |
| commit | acd2b672b45e557829c1f080e46457586aab9d74 (patch) | |
| tree | 9dc5ba94ea6425877edd6f94e254010f938b7ba7 /Documentation/video4linux | |
| parent | 45f014c5264f5e68ef0e51b36f4ef5ede3d18397 (diff) | |
| download | linux-acd2b672b45e557829c1f080e46457586aab9d74.tar.xz | |
[media] media/Documentation: New flag EXECUTE_ON_WRITE
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>
Diffstat (limited to 'Documentation/video4linux')
| -rw-r--r-- | Documentation/video4linux/v4l2-controls.txt | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/video4linux/v4l2-controls.txt b/Documentation/video4linux/v4l2-controls.txt index 0f84ce8c9a7b..5517db602f37 100644 --- a/Documentation/video4linux/v4l2-controls.txt +++ b/Documentation/video4linux/v4l2-controls.txt @@ -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: |