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| author | Hans Verkuil <hans.verkuil@cisco.com> | 2012-09-17 12:06:33 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-09-26 22:34:33 +0400 |
| commit | d2210f9e2e269975db413b8fe4de2f07e6a09b05 (patch) | |
| tree | 7a5db2ecc92b18739062d7ea46b4c91821f27193 /Documentation/video4linux | |
| parent | 90d0fc4985e72c1d09af2078d9e84454b43495f0 (diff) | |
| download | linux-d2210f9e2e269975db413b8fe4de2f07e6a09b05.tar.xz | |
[media] Add vfl_dir field documentation
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation/video4linux')
| -rw-r--r-- | Documentation/video4linux/v4l2-framework.txt | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt index e7006cacc86b..32bfe926e8d7 100644 --- a/Documentation/video4linux/v4l2-framework.txt +++ b/Documentation/video4linux/v4l2-framework.txt @@ -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 |