The irman driver is originally developed for the irman devices, see http://www.intolect.com/irmandetail.htm. These are nowadays discontinued. However, some modern hardware (notably the irtoy) is able to emulate the irman protocol.
The driver is a LIRC_MODE2 driver which gives timing information and thus can be used with most remotes. It expects a /dev/tty* type of device option, defaulting to /dev/ttyS0.
The driver does not support transmitting (IR blasting).