From: Hans Verkuil <hans.verkuil@xxxxxxxxx> Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx> --- Documentation/video4linux/v4l2-framework.txt | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt index 89318be..20f1c05 100644 --- a/Documentation/video4linux/v4l2-framework.txt +++ b/Documentation/video4linux/v4l2-framework.txt @@ -583,11 +583,18 @@ You should also set these fields: - name: set to something descriptive and unique. +- vfl_dir: set to VFL_DIR_TX for output devices and VFL_DIR_M2M for mem2mem + (codec) devices. + - fops: set to the v4l2_file_operations struct. - ioctl_ops: if you use the v4l2_ioctl_ops to simplify ioctl maintenance (highly recommended to use this and it might become compulsory in the - future!), then set this to your v4l2_ioctl_ops struct. + future!), then set this to your v4l2_ioctl_ops struct. The vfl_type and + vfl_dir fields are used to disable ops that do not match the type/dir + combination. E.g. VBI ops are disabled for non-VBI nodes, and output ops + are disabled for a capture device. This makes it possible to provide + just one v4l2_ioctl_ops struct for both vbi and video nodes. - lock: leave to NULL if you want to do all the locking in the driver. Otherwise you give it a pointer to a struct mutex_lock and before the -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
