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

File Facts

System

Linux kernel

Corpus path

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

Extension

.rst

Size

1112 bytes

Lines

53

Domain

Support Tooling And Documentation

Bucket

Documentation

Inferred role

Support Tooling And Documentation: documentation

Status

atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. c:namespace:: DTV.fe

.. _FE_ENABLE_HIGH_LNB_VOLTAGE:

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

Name
====

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

Synopsis
========

.. c:macro:: FE_ENABLE_HIGH_LNB_VOLTAGE

``int ioctl(int fd, FE_ENABLE_HIGH_LNB_VOLTAGE, unsigned int high)``

Arguments
=========

``fd``
    File descriptor returned by :c:func:`open()`.

``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 is returned, and the ``errno`` variable is set
appropriately.

Generic error codes are described at the
:ref:`Generic Error Codes <gen-errors>` chapter.

Annotation

• Atlas domain: Support Tooling And Documentation / Documentation.
• Implementation status: atlas-only.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.