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media: docs: Document the behaviour of uvcvideo driver

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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>
This commit is contained in:
Ricardo Ribalda 2021-06-18 14:29:18 +02:00 committed by Mauro Carvalho Chehab
parent 6350d6a4ed
commit 8c42694150
2 changed files with 6 additions and 0 deletions
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3
Documentation/userspace-api/media/v4l/vidioc-g-ctrl.rst
View File

@ -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.

3
Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
View File

@ -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.