@@ -95,3 +95,8 @@ 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 keeping the new value until the control is active again.
+ This is the case for drivers that do not use the standard control
+ framework and rely purely on the hardware to keep the controls' state.
@@ -438,3 +438,8 @@ 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 keeping the new value until the control is active again.
+ This is the case for drivers that do not use the standard control
+ framework and rely purely on the hardware to keep the controls' state.
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 -EACESS in those cases. Signed-off-by: Ricardo Ribalda <ribalda@chromium.org> --- Documentation/userspace-api/media/v4l/vidioc-g-ctrl.rst | 5 +++++ Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst | 5 +++++ 2 files changed, 10 insertions(+)