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@@ -619,6 +619,16 @@ in your v4l2_file_operations struct.
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Do not use .ioctl! This is deprecated and will go away in the future.
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+In some cases you want to tell the core that a function you had specified in
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+your v4l2_ioctl_ops should be ignored. You can mark such ioctls by calling this
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+function before video_device_register is called:
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+
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+void v4l2_dont_use_cmd(struct video_device *vdev, unsigned int cmd);
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+
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+This tends to be needed if based on external factors (e.g. which card is
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+being used) you want to turns off certain features in v4l2_ioctl_ops without
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+having to make a new struct.
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+
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The v4l2_file_operations struct is a subset of file_operations. The main
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difference is that the inode argument is omitted since it is never used.
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Hans Verkuil