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[media] Add vfl_dir field documentation 

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2012-09-17 05:06:33 -03:00 committed by Mauro Carvalho Chehab
parent 90d0fc4985
commit d2210f9e2e
1 changed files with 9 additions and 1 deletions
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10
Documentation/video4linux/v4l2-framework.txt
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@ -583,11 +583,19 @@ You should also set these fields:
- name: set to something descriptive and unique.
- vfl_dir: set this to VFL_DIR_RX for capture devices (VFL_DIR_RX has value 0,
so this is normally already the default), 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