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authorHans Verkuil <hverkuil@xs4all.nl>2011-01-11 14:45:03 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2011-01-19 11:45:32 -0200
commit2a863793beaa0fc9ee7aeb87efe85544a6b129c0 (patch)
tree9316b12b95a707eb5541db2e24d6033d9b0e2805 /Documentation
parent45f6f84af3ae9db19f39bc5d0976d626b0ef626e (diff)
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op-kernel-dev-2a863793beaa0fc9ee7aeb87efe85544a6b129c0.tar.gz
[media] v4l2-ctrls: v4l2_ctrl_handler_setup must set is_new to 1
Renamed has_new to is_new. Drivers can use the is_new field to determine if a new value was specified for a control. The v4l2_ctrl_handler_setup() must always set this to 1 since the setup has to force a full update of all controls. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/video4linux/v4l2-controls.txt12
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/video4linux/v4l2-controls.txt b/Documentation/video4linux/v4l2-controls.txt
index 8773778d..881e7f4 100644
--- a/Documentation/video4linux/v4l2-controls.txt
+++ b/Documentation/video4linux/v4l2-controls.txt
@@ -285,6 +285,9 @@ implement g_volatile_ctrl like this:
The 'new value' union is not used in g_volatile_ctrl. In general controls
that need to implement g_volatile_ctrl are read-only controls.
+Note that if one or more controls in a control cluster are marked as volatile,
+then all the controls in the cluster are seen as volatile.
+
To mark a control as volatile you have to set the is_volatile flag:
ctrl = v4l2_ctrl_new_std(&sd->ctrl_handler, ...);
@@ -462,6 +465,15 @@ pointer to the v4l2_ctrl_ops struct that is used for that cluster.
Obviously, all controls in the cluster array must be initialized to either
a valid control or to NULL.
+In rare cases you might want to know which controls of a cluster actually
+were set explicitly by the user. For this you can check the 'is_new' flag of
+each control. For example, in the case of a volume/mute cluster the 'is_new'
+flag of the mute control would be set if the user called VIDIOC_S_CTRL for
+mute only. If the user would call VIDIOC_S_EXT_CTRLS for both mute and volume
+controls, then the 'is_new' flag would be 1 for both controls.
+
+The 'is_new' flag is always 1 when called from v4l2_ctrl_handler_setup().
+
VIDIOC_LOG_STATUS Support
=========================
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