linux-loongson/Documentation/userspace-api/media/dvb/fe-dishnetwork-send-legacy-cmd.rst
Mauro Carvalho Chehab f9b2e8aa32 media: docs: make DVB documents more compatible with Sphinx 3.1+
Sphinx 3.x broke support for the cdomain.py extension, as the
c domain code was rewritten. Due to that, the c tags need to
be re-written, in order to use the new c domain notation.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
2020-10-15 07:49:39 +02:00

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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. c:namespace:: DTV.fe
.. _FE_DISHNETWORK_SEND_LEGACY_CMD:
******************************
FE_DISHNETWORK_SEND_LEGACY_CMD
******************************
Name
====
FE_DISHNETWORK_SEND_LEGACY_CMD
Synopsis
========
.. c:macro:: FE_DISHNETWORK_SEND_LEGACY_CMD
``int ioctl(int fd, FE_DISHNETWORK_SEND_LEGACY_CMD, unsigned long cmd)``
Arguments
=========
``fd``
File descriptor returned by :c:func:`open()`.
``cmd``
Sends the specified raw cmd to the dish via DISEqC.
Description
===========
.. warning::
This is a very obscure legacy command, used only at stv0299
driver. Should not be used on newer drivers.
It provides a non-standard method for selecting Diseqc voltage on the
frontend, for Dish Network legacy switches.
As support for this ioctl were added in 2004, this means that such
dishes were already legacy in 2004.
Return Value
============
On success 0 is returned.
On error -1 is returned, and the ``errno`` variable is set
appropriately.
Generic error codes are described at the
:ref:`Generic Error Codes <gen-errors>` chapter.