Documentation/userspace-api/media/rc/rc-sysfs-nodes.rst

Source file repositories/reference/linux-study-clean/Documentation/userspace-api/media/rc/rc-sysfs-nodes.rst

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Linux kernel
Corpus path
Documentation/userspace-api/media/rc/rc-sysfs-nodes.rst
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.rst
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4321 bytes
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145
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.

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Detected Declarations

Annotated Snippet

.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later

.. _remote_controllers_sysfs_nodes:

*******************************
Remote Controller's sysfs nodes
*******************************

As defined at Documentation/ABI/testing/sysfs-class-rc, those are
the sysfs nodes that control the Remote Controllers:


.. _sys_class_rc:

/sys/class/rc/
==============

The ``/sys/class/rc/`` class sub-directory belongs to the Remote
Controller core and provides a sysfs interface for configuring infrared
remote controller receivers.


.. _sys_class_rc_rcN:

/sys/class/rc/rcN/
==================

A ``/sys/class/rc/rcN`` directory is created for each remote control
receiver device where N is the number of the receiver.


.. _sys_class_rc_rcN_protocols:

/sys/class/rc/rcN/protocols
===========================

Reading this file returns a list of available protocols, something like::

	rc5 [rc6] nec jvc [sony]

Enabled protocols are shown in [] brackets.

Writing "+proto" will add a protocol to the list of enabled protocols.

Writing "-proto" will remove a protocol from the list of enabled
protocols.

Writing "proto" will enable only "proto".

Writing "none" will disable all protocols.

Write fails with ``EINVAL`` if an invalid protocol combination or unknown
protocol name is used.


.. _sys_class_rc_rcN_filter:

/sys/class/rc/rcN/filter
========================

Sets the scancode filter expected value.

Use in combination with ``/sys/class/rc/rcN/filter_mask`` to set the
expected value of the bits set in the filter mask. If the hardware
supports it then scancodes which do not match the filter will be
ignored. Otherwise the write will fail with an error.

This value may be reset to 0 if the current protocol is altered.

Annotation

Implementation Notes