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This are just my notes - use this stuff at your own risk!
There is a driver for this.
The Keypad is connected to the ucbs gpios from 3 to 8. if the state of the gpios change the ucb will give a irq. than you can read out the gpio state.
I don't know if they are connected to the ucb
The Battary is attached over the ucbs ADC (Analog to Digital convertor) There is a driver from Zecke in the handhelds.org 2.6 tree. But I beleafe that it is broken. ucb1x00.h has changed.
There is a driver for this, but I don't know if it is working.