"I have a basic driver that appears to make this work, based on I2C captures from the Hauppauge windows software. I will say right now that I have no idea how the hardware actually works — various people have made suggestions but it was not enough for me to figure it out (search the ivtv-devel list on “cheapi2c/lmilk” for more information)."
It's a good first step to getting the hauppauge wintv PVR 150 IR blaster working in linux/mythtv!