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media: vidioc-queryctrl.rst: fix error code 

An attempt to get a BUTTON control returns EACCES, not EINVAL.

BUTTON controls have V4L2_CTRL_FLAG_WRITE_ONLY set, and the documentation
for that flag correctly says that getting a write-only control returns
EACCES. It's the description of the BUTTON type that's wrong, so fix
that so they are consistent.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Hans Verkuil 2020-01-15 18:32:54 +01:00 committed by Mauro Carvalho Chehab
parent 536f561d87
commit 25f98947ce
1 changed files with 1 additions and 1 deletions
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Documentation/media/uapi/v4l/vidioc-queryctrl.rst
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@ -378,7 +378,7 @@ See also the examples in :ref:`control`.
- 0
- 0
- A control which performs an action when set. Drivers must ignore
the value passed with ``VIDIOC_S_CTRL`` and return an ``EINVAL`` error
the value passed with ``VIDIOC_S_CTRL`` and return an ``EACCES`` error
code on a ``VIDIOC_G_CTRL`` attempt.
* - ``V4L2_CTRL_TYPE_INTEGER64``
- any