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| author | Ricardo Ribalda <ribalda@chromium.org> | 2021-06-18 14:29:18 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-09-30 10:07:48 +0200 |
| commit | 8c42694150c27ea68a8d46996d943918c769d1d0 (patch) | |
| tree | c5bdab387304680e2c6d0e290c607d074964d4dd /Documentation/userspace-api | |
| parent | 6350d6a4ed487d16a3a021f76a7edcb9cb60fdbf (diff) | |
| download | linux-8c42694150c27ea68a8d46996d943918c769d1d0.tar.bz2 | |
media: docs: Document the behaviour of uvcvideo driver
The uvc driver relies on the camera firmware to keep the control states
and therefore is not capable of changing an inactive control.
Allow returning -EACCES in those cases.
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'Documentation/userspace-api')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/vidioc-g-ctrl.rst | 3 | ||||
| -rw-r--r-- | Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst | 3 |
2 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-ctrl.rst b/Documentation/userspace-api/media/v4l/vidioc-g-ctrl.rst index 80e8c63d530f..fd09677f64f8 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-g-ctrl.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-g-ctrl.rst @@ -95,3 +95,6 @@ EBUSY EACCES Attempt to set a read-only control or to get a write-only control. + + Or if there is an attempt to set an inactive control and the driver is + not capable of caching the new value until the control is active again. diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst index 2d6bc8d94380..fdde0ae6d521 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst @@ -470,3 +470,6 @@ EACCES Or the ``which`` field was set to ``V4L2_CTRL_WHICH_REQUEST_VAL`` but the device does not support requests. + + Or if there is an attempt to set an inactive control and the driver is + not capable of caching the new value until the control is active again. |