GM965 Thermal Sensor detect

I just write a litte program to try to detect my Lenovo F31G laptop's GPU's temperature. Maybe the hardware has not enable GM965's thermal sensor，
and I can’t get the temperatur of my GM965. Of course, it can be: I don't process as required so I failed.
I was wrong, and find the way to read TR1's value, I need to transfer “calibrated current temperature” to "centigrade degree".