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, 93 deletions

diff --git a/Documentation/media/uapi/dvb/dmx-qbuf.rst b/Documentation/media/uapi/dvb/dmx-qbuf.rst
deleted file mode 100644
index 9dc845daa59d..000000000000
--- a/Documentation/media/uapi/dvb/dmx-qbuf.rst
+++ /dev/null
@@ -1,93 +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
-
-.. _DMX_QBUF:
-
-*************************
-ioctl DMX_QBUF, DMX_DQBUF
-*************************
-
-Name
-====
-
-DMX_QBUF - DMX_DQBUF - Exchange a buffer with the driver
-
-.. warning:: this API is still experimental
-
-
-Synopsis
-========
-
-.. c:function:: int ioctl( int fd, DMX_QBUF, struct dmx_buffer *argp )
-    :name: DMX_QBUF
-
-.. c:function:: int ioctl( int fd, DMX_DQBUF, struct dmx_buffer *argp )
-    :name: DMX_DQBUF
-
-
-Arguments
-=========
-
-``fd``
-    File descriptor returned by :ref:`open() <dmx_fopen>`.
-
-``argp``
-    Pointer to struct :c:type:`dmx_buffer`.
-
-
-Description
-===========
-
-Applications call the ``DMX_QBUF`` ioctl to enqueue an empty
-(capturing) or filled (output) buffer in the driver's incoming queue.
-The semantics depend on the selected I/O method.
-
-To enqueue a buffer applications set the ``index`` field. Valid index
-numbers range from zero to the number of buffers allocated with
-:ref:`DMX_REQBUFS` (struct :c:type:`dmx_requestbuffers` ``count``) minus
-one. The contents of the struct :c:type:`dmx_buffer` returned
-by a :ref:`DMX_QUERYBUF` ioctl will do as well.
-
-When ``DMX_QBUF`` is called with a pointer to this structure, it locks the
-memory pages of the buffer in physical memory, so they cannot be swapped
-out to disk. Buffers remain locked until dequeued, until the
-the device is closed.
-
-Applications call the ``DMX_DQBUF`` ioctl to dequeue a filled
-(capturing) buffer from the driver's outgoing queue.
-They just set the ``index`` field with the buffer ID to be queued.
-When ``DMX_DQBUF`` is called with a pointer to struct :c:type:`dmx_buffer`,
-the driver fills the remaining fields or returns an error code.
-
-By default ``DMX_DQBUF`` blocks when no buffer is in the outgoing
-queue. When the ``O_NONBLOCK`` flag was given to the
-:ref:`open() <dmx_fopen>` function, ``DMX_DQBUF`` returns
-immediately with an ``EAGAIN`` error code when no buffer is available.
-
-The struct :c:type:`dmx_buffer` structure is specified in
-:ref:`buffer`.
-
-
-Return Value
-============
-
-On success 0 is returned, on error -1 and the ``errno`` variable is set
-appropriately. The generic error codes are described at the
-:ref:`Generic Error Codes <gen-errors>` chapter.
-
-EAGAIN
-    Non-blocking I/O has been selected using ``O_NONBLOCK`` and no
-    buffer was in the outgoing queue.
-
-EINVAL
-    The ``index`` is out of bounds, or no buffers have been allocated yet.
-
-EIO
-    ``DMX_DQBUF`` failed due to an internal error. Can also indicate
-    temporary problems like signal loss or CRC errors.