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# LIRC

From ArchWiki

Summary
This article covers using LIRC with serial or USB infrared devices.

LIRC stands for "Linux Infrared Remote Control", a program to use infrared devices (like your remote control from your TV) with linux.

## Supported hardware

First of all, check the official list of supported hardware. Check the table to know, which LIRC kernel modules and lircd driver required for your infrared receiver.

## Installation

Install the lirc-utils package, which is available in the official repositories.

The most of LIRC kernel drivers are already included in the mainline kernel. You need to install lirc package only, if your hardware requires lirc_atiusb, lirc_i2c or lirc_wpc8769l modules.

## Serial receivers

### Serial receivers that depend on lirc_serial

Make sure that your serial port is activated in the BIOS. There you can also set and lookup I/O address and IRQ settings of your ports.

Now there might be a problem: the module lirc_serial is build to use ttyS0 (COM1), if your device is not connected to ttyS0, you will have to either change the module-options or rebuild the LIRC module. If your device is connected to ttyS0, you can skip this step

To change the options for the lirc_serial module, you edit `/etc/modprobe.d/modprobe.conf` and add this line:

    options lirc_serial io=0x2f8 irq=3

You should change the values after io and irq to reflect you serial port settings, the values above may work for you if you are using ttyS1 (COM2) to connect your IR-device. But you will find the correct values by checking dmesg:

    $ dmesg | grep ttyS

### Other serial receivers

See LIRC#Other_receivers

### Building the lirc_serial module for another ttySx

Update abs

    # abs

Copy the LIRC files to a directory you choose yourself:

    $ cp /var/abs/extra/system/lirc /some/dir

    $ cd /some/dir

Edit the PKGBUILD in that directory.

Replace the line:

    ./configure --enable-sandboxed --prefix=/usr \
        --with-driver=all \\
        return 1[/code]

with:

    ./configure --enable-sandboxed --prefix=/usr \
        --with-driver=com2 \
        || return 1[/code]

Where you replace com2 with the com-port you need.

Build and install the package:

    $ makepkg
    # pacman -U lirc-version.pkg.tar.gz

### Loading

Now try to load the serial module:

    # modprobe lirc_serial

If this produces an error which says your serial port is not ready, you have the problem that your serial port support is build into the kernel and not as a module (in the default arch kernel it is build into the kernel)

If it is built into the kernel you will have to do the following (remember that it is built into the kernel, you will need to make some changes later too)

You will have to release the serial port:

    # setserial /dev/ttySx uart none

(Replace x with your port number)

Load the module again:

    # modprobe lirc_serial

Now it should not show any errors, and the modules lirc_serial should be listed in lsmod

## USB receivers including most onboard devices

This outlines the general procedure, the mceusb module which is used by many devices is used as an example.

    # modprobe mceusb

Start the LIRC daemon:

    $ /etc/rc.d/lircd start

Test it with irw, it will output the commands received by the IR receiver that match your `lircd.conf` file. So start irw, point your remote and start pressing buttons.

    $ irw
    000000037ff07bfe 00 One mceusb
    000000037ff07bfd 00 Two mceusb
    000000037ff07bfd 01 Two mceusb
    000000037ff07bf2 00 Home mceusb
    000000037ff07bf2 01 Home mceusb

The above procedure however has been simplified and may not work that easily. One of the reasons the lircd daemon may not be working is because it expects to be run at startup and needs root permissions because it will create device nodes in `/dev`. Try "man lircd" for more information.

Continue with #Making a configuration file

### Setup a HID device with LIRC

Some remotes are supported in the kernel where they are treated as a keyboard and mouse. Every button on the device is recognized as keyboard or mouse events which can be used even without LIRC. LIRC can still be used with these devices to gain greater control over the events raised and integrate with programs that expect a LIRC remote rather than a keyboard. As drivers are migrated to the kernel, devices which use to only be useable through LIRC with their own `lirc.conf` files become standard HID devices.

Some HID remotes actually simulate a USB infrared keyboard and mouse. These remotes show up as two devices so you need to add two LIRC devices to `lircd.conf`.

First we need the `/dev/input` device for our remote:

     $ ls /sys/class/rc/rc0

One of the files should be input#, where the number matches the event# of the device. (To clarify you can check that directory, it will have an event# file.

Note: If you have more than one ir device then there may be multiple directories under `/sys/class/rc`. Under event# `cat name` to verify which device you are looking at.

then go to `/dev/input/by-id`

     $ ls -l /dev/input/by-id

You should find a file that symlinks to the input# above, and possibly others with a similar names for mouse events.

     lrwxrwxrwx 1 root root  9 10月 14 06:43 usb-3353_3713-event-if00 -> ../event9
     lrwxrwxrwx 1 root root 10 10月 14 06:43 usb-3353_3713-event-if01 -> ../event10

Here 'usb-3353_3713-event-if00' and 'usb-3353_3713-event-if01' are the Linux input device event for our HID device, one for the keyboard, another for the mouse.

Then, we need to edit `/etc/conf.d/lircd.conf`. This file contains the parameters for LIRC daemon

     #
     #Parameters for daemon
     #

     LIRC_DEVICE="/dev/input/by-id/usb-3353_3713-event-if00"
     LIRC_DRIVER="devinput"
     LIRC_EXTRAOPS=""
     LIRC_CONFIGFILE="/etc/lirc/lircd.conf"

Note: Here we set up a LIRC device with the id 3353_3713, you should replace it with your own device input event name, whatever it is.

The latest version of the config file for HID remotes exists in the LIRC git repository [1]. Simply save it as `/etc/lirc/lircd.conf`.

In order to launch the LIRC daemon for HID remote, You must enable evdev module first

    # modprobe evdev

Note: LIRC 0.8.6 has changed the default socket location from `/dev/lircd` to `/var/run/lirc/lircd`, but many applications still look for the socket in the old location. Since lirc-utils 0.8.6-3 the `/etc/rc.d/lircd` script creates a symlink from `/dev/lircd` to the `/var/run/lirc/lircd` socket when it starts the lircd daemon and removes the link when the daemon is stopped.

## Other receivers

There are many receivers that do not need any kernel module at all. This applies to any type of receiver, including serial receivers and usb receivers. Check the next link to see what kernel modules you need to load, if any:

LIRC supported devices

## Checking module based receivers

NOTE: This section only applies if your device requires a lirc_[driver] kernel module.

Before you start using lirc, you should check if your receiver is working, and if there is IR interference. Possible sources of interference include monitors/televisions (especially plasma displays), fluorescent lamps and direct or ambient sunlight. Start the following command to display raw receiver input.

    # mode2 -d /dev/lirc0

If you press buttons on any IR remote, you should see a series of pulses and spaces. If there is very frequent output without pressing buttons on your remote, your receiver suffers from interference. You want to avoid such interference, e.g. by placing the receiver behind or under your plasma tv.

If you can't make out where the interference is coming from, you can try to put a cardboard roll right in front of the receiving diode, so that it only gets light from a specific direction. Invoke mode2 as above. Then point at different locations till you receive IR noise.

## LIRC daemon configuration

The lircd configuration lives under /etc/conf.d/lircd.conf, and it is all you need to setup your device if it does not require any special kernel module.

IMPORTANT: lirc-utils package on ArchLinux has a bug. You will have to create your own systemd unit or find another workaround. See bug#31890

## Making a configuration file

You need a configuration file for your remote control copied or symlinked to `/etc/lirc/lircd.conf`. A number of devices have already been included with the lirc package, they can be found in `/usr/share/lirc`. If your specific device is not included, the LIRC site offers configuration files for a large number of extra devices.

If your device does not already have a config file, you can create it yourself with the following command. You should avoid interference (see above) while creating the config file.

    # irrecord -d /dev/lirc0 /tmp/my_remote

Just follow the instructions. To get a list of valid button names, refer to the output of

    # irrecord --list-namespace

The resulting file, `/tmp/my_remote`, should then be copied to `/etc/lirc/lircd.conf`. If you want to use several remotes, you repeat the irrecord step with each remote and different filenames, and then concatenate all the resulting files into `/etc/lirc/lircd.conf`:

    # cat /tmp/my_remote /tmp/my_remote2 /tmp/my_remote3 > /etc/lirc/lircd.conf

Note: As of lirc-0.8.6 the default location of lircd, lircmd and lircrcd config files was moved to `/etc/lirc/lircd.conf`, `/etc/lirc/lircmd.conf` and `/etc/lirc/lircrc`. If the config files are not found in that location, they are still searched at the old location in `/etc/.`

### Testing

First start the lircd daemon:

    # /etc/rc.d/lircd start

A good way to see if LIRC is running is to run irw.

    $ irw

When you press a button, you should see something like this:

    0000000000000001 00 play sony2
    0000000000000001 01 play sony2
    0000000000000001 02 play sony2
    0000000000000001 03 play sony2

In this case the remote is called sony2, the button is called play, and LIRC has seen it 4 times.

## Run LIRC at bootup

Remember if you had to execute the setserial command while loading the module?

If so, your serial port support is compiled into the kernel

### Your serial port support is compiled as a module in the kernel

This is rather easy: you will just have to add lirc_serial to the modules list and lircd to the daemons list in `/etc/rc.conf`

### Your serial port support is compiled into the kernel

This is more complicated, you cannot just add the lirc_serial to the modules list in `/etc/rc.conf`, as the serial port should be released first.

So I created a custom startup script to fix this problem.

    /etc/rc.d/start_lirc

    #!/bin/bash
    #/etc/rc.d/start_lirc
    #releases ttySx and loads lirc_serial module

    . /etc/rc.conf
    . /etc/rc.d/functions

    case "$1" in
      start)
        stat_busy "release ttySx"
        setserial /dev/ttySx uart none
        #load lirc module
        modprobe lirc_serial
        stat_done
        ;;
      stop)
        stat_busy "unload lirc module"
        rmmod lirc_serial
        stat_done
        ;;
      restart)
        $0 stop
        $0 start
        ;;
      *)
        echo "usage: $0 {start|stop|restart}"
    esac
    exit 0

Now load the daemons: add "start_lirc" and "lircd" to the daemons list in `/etc/rc.conf`

## Program specific configuration

### Generate your own lircrc with Mythbuntu's lircrc-generator

mythbuntu-lircrc-generator is intended to be started from a system with LIRC installed. It requires that you choose a remote via the LIRC package or have a `lircd.conf` handy prior to running. It will then produce a sane `.lircrc` for the current user.

Mythbuntu's Lirc/Lircrc Generator is available on AUR
Man page

### Enable LIRC support in xine

Now LIRC works, but you have no program that can communicate with LIRC. This section will explain how to make xine work, but you can use xmms and mplayer (and probably a lot of other programs too) to work with LIRC.

#### Compile xine with LIRC support

Download the xine-ui PKGBUILD with ABS.

Add " --enable-lirc" to the `./configure` line

Compile:

    $ makepkg

Uninstall old xine-ui and install the new one

    # pacman -R xine-ui
    # pacman -U xine-filename.pkg.tar.gz

#### Configure xine to use LIRC

Let xine produce a default `.lircrc` file. In your home directory, type:

    $ xine --keymap=lirc>.lircrc

Now, in order to have a functioning xine+lirc, edit the `.lircrc` file to your preferences.

However, you may choose to configure LIRC to control more than just xine. If this is the case, you will need to manually edit the `.lircrc` file, and add elements.

Xine-ui Mplayer Totem Vlc Rhythmbox

All work with LIRC, but you must enable LIRC support in the program in some cases, such as VLC. Simply copy the vlc packagebuild and edit it so that "--enable-lirc" is one of the compile options for VLC not FFMPEG!

### Configure Amarok2 to use LIRC

Depending on your controller model, the following configuration works with Amarok2-svn. This configuration file will work with the MCEUSB controller.

    ~/.lircrc

    ##amarok2

    begin
    button = Play
    prog   = irexec
    repeat = 0
    config = qdbus org.mpris.amarok /Player Play
    end

    begin
    button = Pause
    prog   = irexec
    repeat = 0
    config = qdbus org.mpris.amarok /Player Pause
    end

    begin
    button = Stop
    prog   = irexec
    repeat = 0
    config = qdbus org.mpris.amarok /Player Stop
    end

    begin
    button = Skip
    prog   = irexec
    repeat = 0
    config = qdbus org.mpris.amarok /Player Next
    end

    begin
    button = Replay
    prog   = irexec
    repeat = 0
    config = qdbus org.mpris.amarok /Player Prev
    end

### Configure Audacious(2) to use LIRC

Depending on your controller model, the following configuration works with all versions of Audacious, including the mercurial builds. This configuration file will work with the MCEUSB controller.

    ~/.lircrc

    ##audacious

    begin
         prog = audacious
         button = Play
         config = PLAY
         repeat = 0
    end

    begin
         prog = audacious
         button = Pause
         config = PAUSE
         repeat = 0
    end

    begin
         prog = audacious
         button = Stop
         config = STOP
         repeat = 0
    end

    begin
         prog = audacious
         button = Skip
         config = NEXT
         repeat = 0
    end

    begin
         prog = audacious
         button = Replay
         config = PREV
         repeat = 0
    end

    begin
         prog = audacious
         button = VolUp
         config = VOL_UP
         repeat = 1
    end

    begin
         prog = audacious
         button = VolDown
         config = VOL_DOWN
         repeat = 1
    end

Additionally, there are other values that may be set according to the model set forth above. This was taken from the lirc.c file from audacious-plugins source code:

    lirc.c

    PLAY
    STOP
    PAUSE
    PLAYPAUSE
    NEXT
    PREV
    SHUFFLE
    REPEAT
    FWD
    BWD
    VOL_UP
    VOL_DOWN
    QUIT
    MUTE
    BAL_LEFT
    BAL_RIGHT
    BAL_CENTER
    LIST
    PLAYLIST_CLEAR
    PLAYLIST_ADD

### Configure Mplayer to use LIRC

    ~/.lircrc

    ##mplayer

    begin
        button = PLAY/PAUSE
        prog = mplayer
        config = pause
        repeat = 1
    end
    begin
        button = FWD
        prog = mplayer
        config = seek 5
    end
    begin
        button = REV
        prog = mplayer
        config = seek -5
    end
    begin
        button = MAXIMIZE
        prog = mplayer
        config = vo_fullscreen
    end

only change PLAY/PAUSE, FWD etc. on keys from your /etc/lircd.conf

## Device Specific Examples

### X10

There is a dedicated wiki page with information about X10

### Asus DH Deluxe series motherboard

Check the output of:

    $ cat /dev/usb/hiddevX

where X is 0,1 or bigger, and press some buttons on remote. If you can see reply, device works fine, follow steps:

1. In file `/etc/conf.d/lircd.conf` add:

    LIRC_DRIVER="dvico"

2. Reload LIRC:

    /etc/rc.d/lircd restart

### ASRock ION series (Nuvoton) quickstart

    $ ln -s /usr/share/lirc/remotes/lirc_wb677/lircd.conf.wb677 /etc/lirc/lircd.conf
    $ /etc/rc.d/lircd restart

### Streamzap PC Remote (USB)

Note: Xorg now auto recognizes this remote as a keybaord!

To disable this behavior, add the following to `/etc/X11/xorg.conf.d/90-streamzap.conf`:

    Section "InputClass"
      Identifier "Ignore Streamzap IR"
      MatchProduct "Streamzap"
      MatchIsKeyboard "true"
      Option "Ignore" "true"
    EndSection

1. Install both packages (lirc lirc-utils)
2. Modprobe both kernel mods (lirc_dev and streamzap). To have modules autoload at boot create the following file

    /etc/modules-load.d/lirc_streamzap.conf

    #modules for streamzap remote
    lirc_dev
    streamzap

1. Create your `/etc/lirc/lircd.conf` (for this remote, copy `/usr/share/lirc/streamzap/lircd.conf.streamzap` to `/etc/lirc/lircd.conf`)
2. Fix the broken lirc.service file:

    /usr/lib/systemd/system/lirc.service

    [Unit]
    Description=Linux Infrared Remote Control

    [Service]
    EnvironmentFile=/etc/lirc/lircd.conf
    ExecStartPre=/usr/bin/ln -sf /run/lirc/lircd /dev/lircd
    ExecStart=/usr/bin/lircd --pidfile=/run/lirc/lircd.pid -d /dev/lirc0
    Type=forking
    PIDFile=/run/lirc/lircd.pid

    [Install]
    WantedBy=multi-user.target

You might have to play around with lircd and irw to find your remote. In the above example, it's /dev/lirc0.

Use `lircd -d /dev/...` to start lircd with a certain device. Run `irw` and test it out. When you find the right device, modify `/usr/lib/systemd/system/lirc.service` accordingly.

1. Start lircd via `# systemctl start lirc` to survive a reboot use `# systemctl enable lirc`
2. Test the remote/lirc with irw

    $ irw
    00000000000028cc 00 CH_UP Streamzap_PC_Remote
    00000000000028ce 00 CH_DOWN Streamzap_PC_Remote
    00000000000028c8 00 8 Streamzap_PC_Remote
    00000000000028c5 00 5 Streamzap_PC_Remote
    00000000000028d2 00 OK Streamzap_PC_Remote
    00000000000028d1 00 LEFT Streamzap_PC_Remote
    00000000000028d1 01 LEFT Streamzap_PC_Remote
    00000000000028d1 00 LEFT Streamzap_PC_Remote
    00000000000028d3 00 RIGHT Streamzap_PC_Remote
    00000000000028d3 00 RIGHT Streamzap_PC_Remote
    00000000000028d3 00 RIGHT Streamzap_PC_Remote
    00000000000028d3 00 RIGHT Streamzap_PC_Remote
    00000000000028d4 00 DOWN Streamzap_PC_Remote
    00000000000028d4 00 DOWN Streamzap_PC_Remote
    00000000000028d4 00 DOWN Streamzap_PC_Remote

Note: When the batteries in this remote are low, it may stop working even though the red LED on the received still flashes when you hit buttons!

### Serial Port "Home Brew" IR Receiver

Here's how to get a "Home Brew" serial port IR receiver working:

1. Create a udev rule to give non-privleged users read/write access to the serial port. I will be using ttyS0 in my example.

    /etc/udev/rules.d/z98-serial.rules

    # For serial port ttyS0 and LIRC
    KERNEL=="ttyS0",SUBSYSTEM=="tty",DRIVERS=="serial",MODE="0666"

2. Create the needed modprobe configs

    /etc/modules-load.d/lirc_serial.conf

    lirc_serial

    /etc/modprobe.d/lirc_serial.conf

    install lirc_serial /usr/bin/setserial /dev/ttyS0 uart none && /sbin/modprobe --first-time --ignore-install lirc_serial
    options lirc_serial type=0
    remove lirc_serial /sbin/modprobe -r --first-time --ignore-remove lirc_serial && /sbin/modprobe -r lirc_dev

Note: Using udev rules to run the setserial command does not work in my experience because lirc_serial gets loaded before the serial port rules are applied.

3. Install your systemd service file.

    /etc/systemd/system/lirc.service

    [Unit]
    Description=Linux Infrared Remote Control
    After=network.target

    [Service]
    Type=simple
    PIDFile=/run/lirc/lircd.pid
    ExecStartPre=/bin/rm -f /dev/lirc /dev/lircd /var/run/lirc/lircd
    ExecStart=/usr/sbin/lircd -n -r -P /run/lirc/lircd.pid -d /dev/lirc0 -o /run/lirc/lircd
    ExecStartPost=/usr/bin/ln -sf /run/lirc/lircd /dev/lircd
    ExecStartPost=/usr/bin/ln -sf /dev/lirc0 /dev/lirc
    ExecReload=/bin/kill -SIGHUP $MAINPID

    [Install]
    WantedBy=multi-user.target

4. We still need the default tmpfiles to be created, so copy that config file to `/etc/tmpfiles.d/lirc.conf`.

    # cp -a /usr/lib/tmpfiles.d/lirc.conf /etc/tmpfiles.d/lirc.conf

5. Create a `.lircrc` file in your home directory for your user or a `/etc/lirc/lircrc` file for system wide use.

6. Have your service start at boot and then test with a reboot

    # systemctl enable lirc.service
    # systemctl reboot

or load the module and start the lirc.service.

    # modprobe lirc_serial
    # systemctl start lirc.service

### Receivers that do not depend on a kernel module

Usually, you only need to specify your the device where the receiver is plugged in and the lirc driver. This is an example for pinnacle or miro serial receivers):

     LIRC_DEVICE="/dev/ttySX"
     LIRC_DRIVER="pinsys"

Then, start lircd daemon and create the remote/s configuration (/etc/lirc/lircd.conf), either by copying one of the configured defaults that comes with lirc-utils or by using irrecord. Even if you find your remote in the list of preconfigured remotes it might not work so you will have to use irrecord anyway.

After this you can use irw to check the remote, create your ~/.lircrc to assign remote buttons to actions and start irexec if you need to run arbitrary commands.

## Troubleshooting

### Buttons processed several times when pressed

Problem in module ir_core which processes IR commands with LIRC at the same time. Simply blacklist it by creating the following file:

    /etc/modprobe.d/remote_blacklist.conf

    # Prevent processing button several times when pressed
    blacklist ir_core

### After upgrading or installing Arch, an existing configuration stopped working

#### Kernel module change

As of kernel 2.6.36, LIRC modules have been included in the kernel. Arch's lirc package has included the older kernel modules, which work with lircd without any additional configuration. However, a recent update removed those older modules, which results in the stock kernel modules being used. Unfortunately, these kernel modules treat the remote as a keyboard by default, which is incompatible for lircd. To correct this, put the following line to `/etc/rc.local`:

    /etc/rc.local

    echo lirc > /sys/class/rc/rc0/protocols

You may also run that command as root to enable LIRC for your current session.

Systemd has moved away from `rc.local`. It is possible to use tmpfiles.d (read "man tmpfiles.d") to run the command `echo lirc > /sys/class/rc/rc0/protocols`. Create the file `/etc/tmpfiles.d/lirc-protocols.conf`:

    /etc/tmpfiles.d/lirc-protocols.conf

    w /sys/class/rc/rc0/protocols - - - - lirc

Note: It is also a good idea to remove the old LIRC kernel module from your MODULES array in `/etc/rc.conf`, as it is no longer present.

### Problems using default systemd lirc.service file

The lirc service used to use a conf.d file for configuring command-line parameters, but the functionality was removed for systemd since the default configuration tends to work for the majority of use cases after kernel support for lirc was introduced. See FS#31890.

As the bug report states, the "correct" way to fix this issue is to use a drop-in service file; however, the workaround below can be a quick fix for a particular common problem.

#### Workaround

How to know you might need the workaround -- `/var/log/lirc` shows error finding `/dev/lirc`:

    lircd: could not get file information for /dev/lirc

Workaround: make a symbolic link for `/dev/lirc` that points to `/dev/lirc0` with file

    /etc/tmpfiles.d/lirc-dev.conf

    L /dev/lirc - - - - /dev/lirc0

#### Replacing/overriding the existing service file

    /etc/systemd/system/multi-user.target.wants/lirc.service

    [Unit]
    Description=Linux Infrared Remote Control
    [Service]
    EnvironmentFile=/etc/conf.d/lircd.conf
    ExecStartPre=/usr/bin/ln -sf /run/lirc/lircd /dev/lircd
    ExecStart=/usr/bin/lircd --pidfile=/run/lirc/lircd.pid --device=${LIRC_DEVICE} --driver=${LIRC_DRIVER} $LIRC_EXTRAOPTS ${LIRC_CONFIGFILE}
    Type=forking
    PIDFile=/run/lirc/lircd.pid
    [Install]
    WantedBy=multi-user.target

    /etc/conf.d/lircd.conf

    #
    # Parameters for lirc daemon
    #
    LIRC_DEVICE="YOUR DEVICE"
    LIRC_DRIVER="YOUR DRIVER"
    LIRC_EXTRAOPTS=""
    LIRC_CONFIGFILE="/etc/lircd.conf"

With these you can start the daemon with preferred parameters from the config file.

`EnvironmentFile=` in the service file specifies the file with service parameters. `–device=${LIRC_DEVICE} –driver=${LIRC_DRIVER} $LIRC_EXTRAOPTS ${LIRC_CONFIG}` uses the created variables from file as parameters to the daemon.

## See also

- http://www.mythtv.org/wiki/Category:Remote_Controls -- MythTV wiki main LIRC article
- http://www.mythtv.org/wiki/MCE_Remote -- MythTV wiki on MCE remotes
- http://en.gentoo-wiki.com/wiki/LIRC -- Gentoo wiki LIRC how-to
- https://aur.archlinux.org/packages.php?ID=33849 -- Lirc/Lircrc Configuration Generator

Retrieved from "https://wiki.archlinux.org/index.php?title=LIRC&oldid=280289"
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