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>
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.
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.