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[media] v4l2-framework.txt: document v4l2_dont_use_cmd

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Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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Hans Verkuil 2012-05-10 05:04:41 -03:00 committed by Mauro Carvalho Chehab
parent 5126f2590b
commit 1dd8728e21
1 changed files with 10 additions and 0 deletions
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10
Documentation/video4linux/v4l2-framework.txt
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@ -619,6 +619,16 @@ in your v4l2_file_operations struct.
Do not use .ioctl! This is deprecated and will go away in the future.
In some cases you want to tell the core that a function you had specified in
your v4l2_ioctl_ops should be ignored. You can mark such ioctls by calling this
function before video_device_register is called:
void v4l2_dont_use_cmd(struct video_device *vdev, unsigned int cmd);
This tends to be needed if based on external factors (e.g. which card is
being used) you want to turns off certain features in v4l2_ioctl_ops without
having to make a new struct.
The v4l2_file_operations struct is a subset of file_operations. The main
difference is that the inode argument is omitted since it is never used.