path: root/Documentation
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authorHans Verkuil <hans.verkuil@cisco.com>2011-08-26 07:35:14 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2011-09-21 09:52:21 -0300
commit88365105d683187e02a4f75220eaf51fd0c0b6e0 (patch)
treeacbc18b9e8eb7f74630fb7fd709cb35eafd30f54 /Documentation
parent74a45790861f659058e8f8b565d98e5a1fdd8440 (diff)
[media] v4l2-ctrls: replace is_volatile with V4L2_CTRL_FLAG_VOLATILE
With the new flag there is no need anymore to have a separate is_volatile field. Modify all users to use the new flag. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Acked-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation')
1 files changed, 6 insertions, 7 deletions
diff --git a/Documentation/video4linux/v4l2-controls.txt b/Documentation/video4linux/v4l2-controls.txt
index 9346fc8cbf2b..f92ee3053940 100644
--- a/Documentation/video4linux/v4l2-controls.txt
+++ b/Documentation/video4linux/v4l2-controls.txt
@@ -285,11 +285,11 @@ 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.
-To mark a control as volatile you have to set the is_volatile flag:
+To mark a control as volatile you have to set V4L2_CTRL_FLAG_VOLATILE:
ctrl = v4l2_ctrl_new_std(&sd->ctrl_handler, ...);
if (ctrl)
- ctrl->is_volatile = 1;
+ ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
For try/s_ctrl the new values (i.e. as passed by the user) are filled in and
you can modify them in try_ctrl or set them in s_ctrl. The 'cur' union
@@ -367,8 +367,7 @@ Driver specific controls can be created using v4l2_ctrl_new_custom():
The last argument is the priv pointer which can be set to driver-specific
private data.
-The v4l2_ctrl_config struct also has fields to set the is_private and is_volatile
+The v4l2_ctrl_config struct also has a field to set the is_private flag.
If the name field is not set, then the framework will assume this is a standard
control and will fill in the name, type and flags fields accordingly.
@@ -506,8 +505,8 @@ operation should return the value that the hardware's automatic mode set up
If the cluster is put in manual mode, then the manual controls should become
-active again and the is_volatile flag should be ignored (so g_volatile_ctrl is
-no longer called while in manual mode).
+active again and V4L2_CTRL_FLAG_VOLATILE should be ignored (so g_volatile_ctrl
+is no longer called while in manual mode).
Finally the V4L2_CTRL_FLAG_UPDATE should be set for the auto control since
changing that control affects the control flags of the manual controls.
@@ -520,7 +519,7 @@ void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
The first two arguments are identical to v4l2_ctrl_cluster. The third argument
tells the framework which value switches the cluster into manual mode. The
-last argument will optionally set the is_volatile flag for the non-auto controls.
+last argument will optionally set V4L2_CTRL_FLAG_VOLATILE for the non-auto controls.
The first control of the cluster is assumed to be the 'auto' control.

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