LIRC Kernel Module for FreeBSD

lirc-kmod is a kernel module for LIRC compatible device driver (framework) and hardware specific backends. Current implementation supports LIRC_MODE_MODE2 receivers only.

Build

You need to have FreeBSD kernel source installed before you start. If you use a binary distribution please make sure that kernel source version matches. When ready, simply kick start the build from the directory where you put the lirc-kmod source:

# make
# make install

All files will be installed under the /boot/modules directory.

Configuration

Add a line specific for your IR hardware to the /boot/loader.conf file to enable the driver. For example:

itecir_load="YES"

A hw.lirc.rx_buffersize tunable can be used to control LIRC receive buffer size if required. Use /boot/loader.conf file to change the default:

hw.lirc.rx_buffersize=128

ITE CIR Backend

Currently supported chips are ITE8704 and ITE8713. There are global tunables provided to control the default IR communication frequency and baudrate. For example:

hw.itecir.default_freq=38000
hw.itecir.default_baudrate=115200

A device specific hints can be given in the /boot/device.hints file to enable precious signal demodulation. For example:

hints.itecir.0.lowcarrierfreq=27000
hints.itecir.0.highcarrierfreq=400000

Known Issues

FreeBSD ACPI support does not strictly follow the original specification. It is always assumed that _CRS verb provides a correct value for the subsequent _SRS call. This is not true for at least ASUS EeeBox PC EB1505. A workaround put in place in order to build a working _SRS buffer. You may need to adjust values inside the code guarded by the LIRC_ACPI_HACK knob.