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authorRicardo Ribalda <ricardo.ribalda@gmail.com>2015-03-20 11:13:14 -0300
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-04-08 06:35:16 -0300
commitacd2b672b45e557829c1f080e46457586aab9d74 (patch)
tree9dc5ba94ea6425877edd6f94e254010f938b7ba7 /Documentation/video4linux
parent45f014c5264f5e68ef0e51b36f4ef5ede3d18397 (diff)
downloadkernel-acd2b672b45e557829c1f080e46457586aab9d74.tar.gz
[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.txt4
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: