[media] doc-rst: document LIRC_GET_*_TIMEOUT ioctls

Improve the documentation for those ioctls, adding them to
a separate file, in order to look like the rest of the
book, and to later allow to generate a man page for those
ioctls.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/Documentation/media/uapi/rc/lirc-get-timeout.rst b/Documentation/media/uapi/rc/lirc-get-timeout.rst
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+.. -*- coding: utf-8; mode: rst -*-
+
+.. _lirc_get_min_timeout:
+.. _lirc_get_max_timeout:
+
+****************************************************
+ioctls LIRC_GET_MIN_TIMEOUT and LIRC_GET_MAX_TIMEOUT
+****************************************************
+
+Name
+====
+
+LIRC_GET_MIN_TIMEOUT / LIRC_GET_MAX_TIMEOUT - Obtain the possible timeout
+range for IR receive.
+
+Synopsis
+========
+
+.. cpp:function:: int ioctl( int fd, int request, __u32 *timeout)
+
+Arguments
+=========
+
+``fd``
+    File descriptor returned by open().
+
+``request``
+    LIRC_GET_MIN_TIMEOUT or LIRC_GET_MAX_TIMEOUT
+
+``timeout``
+    Timeout, in microseconds.
+
+
+Description
+===========
+
+Some devices have internal timers that can be used to detect when
+there's no IR activity for a long time. This can help lircd in
+detecting that a IR signal is finished and can speed up the decoding
+process. Returns an integer value with the minimum/maximum timeout
+that can be set.
+
+.. note::
+
+   Some devices have a fixed timeout, in that case
+   both ioctls will return the same value even though the timeout
+   cannot be changed via :ref:`LIRC_SET_REC_TIMEOUT`.
+
+
+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.