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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. 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 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. difference is that the inode argument is omitted since it is never used.