Documentation/linux_tv/media/dvb/fe-enable-high-lnb-voltage.rst

.. -*- coding: utf-8; mode: rst -*-

.. _FE_ENABLE_HIGH_LNB_VOLTAGE:

********************************
ioctl FE_ENABLE_HIGH_LNB_VOLTAGE
********************************

*man FE_ENABLE_HIGH_LNB_VOLTAGE(2)*

Select output DC level between normal LNBf voltages or higher LNBf
voltages.


Synopsis
========

.. c:function:: int ioctl( int fd, int request, unsigned int high )

Arguments
=========

``fd``
    File descriptor returned by :ref:`open() <frontend_f_open>`.

``request``
    FE_ENABLE_HIGH_LNB_VOLTAGE

``high``
    Valid flags:

    -  0 - normal 13V and 18V.

    -  >0 - enables slightly higher voltages instead of 13/18V, in order
       to compensate for long antenna cables.


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

Select output DC level between normal LNBf voltages or higher LNBf
voltages between 0 (normal) or a value grater than 0 for higher
voltages.

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.


.. ------------------------------------------------------------------------------
.. This file was automatically converted from DocBook-XML with the dbxml
.. library (https://github.com/return42/sphkerneldoc). The origin XML comes
.. from the linux kernel, refer to:
..
.. * https://github.com/torvalds/linux/tree/master/Documentation/DocBook
.. ------------------------------------------------------------------------------