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| author | Jacopo Mondi <jacopo@jmondi.org> | 2020-05-07 18:12:49 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-05-12 18:03:26 +0300 |
| commit | 3fb0ee8b3b79ee9c8fb7769bdf802bffeae7e085 (patch) | |
| tree | ed1520460313915b3c985600613d5fee113e1507 /Documentation/userspace-api/media/v4l/vidioc-g-std.rst | |
| parent | 18200e9e243d9095be953cf09cba29f9b3b5f262 (diff) | |
| download | linux-3fb0ee8b3b79ee9c8fb7769bdf802bffeae7e085.tar.xz | |
media: Documentation: media: Document read-only subdevice
Document a new kAPI function to register subdev device nodes in read only
mode and for each affected ioctl report how access is restricted.
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'Documentation/userspace-api/media/v4l/vidioc-g-std.rst')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/vidioc-g-std.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-std.rst b/Documentation/userspace-api/media/v4l/vidioc-g-std.rst index b0bdb719d405..6d8cb7f29ac6 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-g-std.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-g-std.rst @@ -66,6 +66,9 @@ video timings (e.g. if :ref:`VIDIOC_ENUMINPUT` does not set the ``V4L2_IN_CAP_STD`` flag), then ``ENODATA`` error code is returned. +Calling ``VIDIOC_SUBDEV_S_STD`` on a subdev device node that has been registered +in read-only mode is not allowed. An error is returned and the errno variable is +set to ``-EPERM``. Return Value ============ @@ -79,3 +82,6 @@ EINVAL ENODATA Standard video timings are not supported for this input or output. + +EPERM + ``VIDIOC_SUBDEV_S_STD`` has been called on a read-only subdevice. |