Whoa, wasn't aware of temperature sensor inside touchscreen controller. Frankly, I'm afraid it would tell more about whole device's ground plane temperature (maybe degree or two lower than one reported by battery gauge), rather than ambient one...

Still, it looks interesting, even though i don't have slightest idea where to start, and if/how we can access such info via i2c bus. will try to ask some knowledgeable folks (as you may know from readme and documentation, bnf is based on research and proof-of-concepts/usable tools by ShadowJK). don't get your hopes right, but will check what could be done.

/Estel