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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-subdev-g-frame-interval.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-subdev-g-frame-interval.rst')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/vidioc-subdev-g-frame-interval.rst | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-frame-interval.rst b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-frame-interval.rst index b61baaf11624..51e1bff797f0 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-frame-interval.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-frame-interval.rst @@ -65,6 +65,10 @@ struct contains the current frame interval as would be returned by a ``VIDIOC_SUBDEV_G_FRAME_INTERVAL`` call. +Calling ``VIDIOC_SUBDEV_S_FRAME_INTERVAL`` 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``. + Drivers must not return an error solely because the requested interval doesn't match the device capabilities. They must instead modify the interval to match what the hardware can provide. The modified interval @@ -118,3 +122,7 @@ EINVAL :c:type:`v4l2_subdev_frame_interval` ``pad`` references a non-existing pad, or the pad doesn't support frame intervals. + +EPERM + The ``VIDIOC_SUBDEV_S_FRAME_INTERVAL`` ioctl has been called on a read-only + subdevice. |