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| author |   Jacopo Mondi <jacopo@jmondi.org> | 2020-05-07 17:12:49 +0200 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-05-12 17:03:26 +0200 |
| commit | 3fb0ee8b3b79ee9c8fb7769bdf802bffeae7e085 (patch) | |
| tree | ed1520460313915b3c985600613d5fee113e1507 /Documentation/userspace-api/media/v4l/vidioc-g-dv-timings.rst | |
| parent | media: Documentation: media: Update sub-device API intro (diff) | |
| download | wireguard-linux-3fb0ee8b3b79ee9c8fb7769bdf802bffeae7e085.tar.xz wireguard-linux-3fb0ee8b3b79ee9c8fb7769bdf802bffeae7e085.zip | |
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-dv-timings.rst')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/vidioc-g-dv-timings.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-dv-timings.rst b/Documentation/userspace-api/media/v4l/vidioc-g-dv-timings.rst index 84806a893cb7..9a035a4ea0f0 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-g-dv-timings.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-g-dv-timings.rst @@ -57,6 +57,10 @@ pointer to the struct :c:type:`v4l2_dv_timings` structure as argument. If the ioctl is not supported or the timing values are not correct, the driver returns ``EINVAL`` error code. +Calling ``VIDIOC_SUBDEV_S_DV_TIMINGS`` 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``. + The ``linux/v4l2-dv-timings.h`` header can be used to get the timings of the formats in the :ref:`cea861` and :ref:`vesadmt` standards. If the current input or output does not support DV timings (e.g. if @@ -81,6 +85,8 @@ ENODATA EBUSY The device is busy and therefore can not change the timings. +EPERM + ``VIDIOC_SUBDEV_S_DV_TIMINGS`` has been called on a read-only subdevice. .. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}| |