Documentation/linux_tv/media/v4l/lirc_dev_intro.rst

   1 .. -*- coding: utf-8; mode: rst -*-
   2
   3 .. _lirc_dev_intro:
   4
   5 ************
   6 Introduction
   7 ************
   8
   9 The LIRC device interface is a bi-directional interface for transporting
  10 raw IR data between userspace and kernelspace. Fundamentally, it is just
  11 a chardev (/dev/lircX, for X = 0, 1, 2, ...), with a number of standard
  12 struct file_operations defined on it. With respect to transporting raw
  13 IR data to and fro, the essential fops are read, write and ioctl.
  14
  15 Example dmesg output upon a driver registering w/LIRC:
  16
  17     $ dmesg |grep lirc_dev
  18
  19     lirc_dev: IR Remote Control driver registered, major 248
  20
  21     rc rc0: lirc_dev: driver ir-lirc-codec (mceusb) registered at minor
  22     = 0
  23
  24 What you should see for a chardev:
  25
  26     $ ls -l /dev/lirc*
  27
  28     crw-rw---- 1 root root 248, 0 Jul 2 22:20 /dev/lirc0
  29
  30
  31 .. ------------------------------------------------------------------------------
  32 .. This file was automatically converted from DocBook-XML with the dbxml
  33 .. library (https://github.com/return42/sphkerneldoc). The origin XML comes
  34 .. from the linux kernel, refer to:
  35 ..
  36 .. * https://github.com/torvalds/linux/tree/master/Documentation/DocBook
  37 .. ------------------------------------------------------------------------------