linux-next/Documentation/userspace-api/media/rc/lirc-set-rec-carrier-range.rst

.. 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/userspace-api/media/fdl-appendix.rst.
..
.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections

.. _lirc_set_rec_carrier_range:

********************************
ioctl LIRC_SET_REC_CARRIER_RANGE
********************************

Name
====

LIRC_SET_REC_CARRIER_RANGE - Set lower bound of the carrier used to modulate
IR receive.

Synopsis
========

.. c:function:: int ioctl( int fd, LIRC_SET_REC_CARRIER_RANGE, __u32 *frequency )
    :name: LIRC_SET_REC_CARRIER_RANGE

Arguments
=========

``fd``
    File descriptor returned by open().

``frequency``
    Frequency of the carrier that modulates PWM data, in Hz.

Description
===========

This ioctl sets the upper range of carrier frequency that will be recognized
by the IR receiver.

.. note::

   To set a range use :ref:`LIRC_SET_REC_CARRIER_RANGE
   <LIRC_SET_REC_CARRIER_RANGE>` with the lower bound first and later call
   :ref:`LIRC_SET_REC_CARRIER <LIRC_SET_REC_CARRIER>` with the upper bound.

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.