media: docs: move uAPI book to userspace-api/media

Since 2017, there is an space reserved for userspace API,
created by changeset 1d596dee3862 ("docs: Create a user-space API guide").

As the media subsystem was one of the first subsystems to use
Sphinx, until this patch, we were keeping things on a separate
place.

Let's just use the new location, as having all uAPI altogether
will likely make things easier for developers.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

1 files changed, 0 insertions, 90 deletions

diff --git a/Documentation/media/uapi/v4l/func-open.rst b/Documentation/media/uapi/v4l/func-open.rst
deleted file mode 100644
index a3d149ce6635..000000000000
--- a/Documentation/media/uapi/v4l/func-open.rst
+++ /dev/null
@@ -1,90 +0,0 @@
-.. Permission is granted to copy, distribute and/or modify this
-.. document under the terms of the GNU Free Documentation License,
-.. Version 1.1 or any later version published by the Free Software
-.. Foundation, with no Invariant Sections, no Front-Cover Texts
-.. and no Back-Cover Texts. A copy of the license is included at
-.. Documentation/media/uapi/fdl-appendix.rst.
-..
-.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
-
-.. _func-open:
-
-***********
-V4L2 open()
-***********
-
-Name
-====
-
-v4l2-open - Open a V4L2 device
-
-
-Synopsis
-========
-
-.. code-block:: c
-
-    #include <fcntl.h>
-
-
-.. c:function:: int open( const char *device_name, int flags )
-    :name: v4l2-open
-
-Arguments
-=========
-
-``device_name``
-    Device to be opened.
-
-``flags``
-    Open flags. Access mode must be ``O_RDWR``. This is just a
-    technicality, input devices still support only reading and output
-    devices only writing.
-
-    When the ``O_NONBLOCK`` flag is given, the :ref:`read() <func-read>`
-    function and the :ref:`VIDIOC_DQBUF <VIDIOC_QBUF>` ioctl will
-    return the ``EAGAIN`` error code when no data is available or no
-    buffer is in the driver outgoing queue, otherwise these functions
-    block until data becomes available. All V4L2 drivers exchanging data
-    with applications must support the ``O_NONBLOCK`` flag.
-
-    Other flags have no effect.
-
-
-Description
-===========
-
-To open a V4L2 device applications call :ref:`open() <func-open>` with the
-desired device name. This function has no side effects; all data format
-parameters, current input or output, control values or other properties
-remain unchanged. At the first :ref:`open() <func-open>` call after loading the
-driver they will be reset to default values, drivers are never in an
-undefined state.
-
-
-Return Value
-============
-
-On success :ref:`open() <func-open>` returns the new file descriptor. On error
--1 is returned, and the ``errno`` variable is set appropriately.
-Possible error codes are:
-
-EACCES
-    The caller has no permission to access the device.
-
-EBUSY
-    The driver does not support multiple opens and the device is already
-    in use.
-
-ENXIO
-    No device corresponding to this device special file exists.
-
-ENOMEM
-    Not enough kernel memory was available to complete the request.
-
-EMFILE
-    The process already has the maximum number of files open.
-
-ENFILE
-    The limit on the total number of files open on the system has been
-    reached.