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| author | Hans Verkuil <hans.verkuil@cisco.com> | 2018-08-28 05:11:04 -0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2018-09-11 09:58:43 -0400 |
| commit | d4215edbd4b170b207b0e5a1d8ae42fb49f5c470 (patch) | |
| tree | db1df36c81efab414012420efe3f28a868f1c754 /Documentation/media/uapi/v4l/vidioc-g-ext-ctrls.rst | |
| parent | 15cd442e79e2a60a725ee5501e4ffb537698c802 (diff) | |
| download | linux-0-day-d4215edbd4b170b207b0e5a1d8ae42fb49f5c470.tar.gz linux-0-day-d4215edbd4b170b207b0e5a1d8ae42fb49f5c470.tar.xz | |
media: media-request: update documentation
Various clarifications and readability improvements based on
Laurent Pinchart's review of the documentation.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'Documentation/media/uapi/v4l/vidioc-g-ext-ctrls.rst')
| -rw-r--r-- | Documentation/media/uapi/v4l/vidioc-g-ext-ctrls.rst | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/media/uapi/v4l/vidioc-g-ext-ctrls.rst b/Documentation/media/uapi/v4l/vidioc-g-ext-ctrls.rst index 54a999df5aec4..d9930fe776cf8 100644 --- a/Documentation/media/uapi/v4l/vidioc-g-ext-ctrls.rst +++ b/Documentation/media/uapi/v4l/vidioc-g-ext-ctrls.rst @@ -237,7 +237,7 @@ still cause this situation. .. note:: - When using ``V4L2_CTRL_WHICH_DEF_VAL`` note that You can only + When using ``V4L2_CTRL_WHICH_DEF_VAL`` be aware that you can only get the default value of the control, you cannot set or try it. For backwards compatibility you can also use a control class here @@ -382,7 +382,8 @@ EINVAL :c:type:`v4l2_ext_control` ``value`` was inappropriate (e.g. the given menu index is not supported by the driver), or the ``which`` field was set to ``V4L2_CTRL_WHICH_REQUEST_VAL`` - but the given ``request_fd`` was invalid. + but the given ``request_fd`` was invalid or ``V4L2_CTRL_WHICH_REQUEST_VAL`` + is not supported by the kernel. This error code is also returned by the :ref:`VIDIOC_S_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` and :ref:`VIDIOC_TRY_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` ioctls if two or more control values are in conflict. |