Most recent distributions of Linux already contain the driver for Tira.
Tira-2.1 development API is now avaiable for Linux. You can download source code along with a sample applicaton.
Right now LIRC only supports receive mode. Complete support for Lirc will be available shortly.
The linux driver for Tira is available and can be found at sourcforge.net. Note that recent distributions of Linux already have drivers for Tira. However you might need to enable the driver. LIRC is located at www.lirc.org