> None of the line is low. If I touch the screen the interrupt line goes down, and on SDA and SCL I see some waveform. The reset pin is always up.
The line goes low, but does it come back up?
You might want to put some simple printk calls in the touchscreen driver interrupt routine (function ft5x06_ts_isr )and also in the work queue function ( ft5x06_ts_poscheck ). What should happen is that the interrupt should fire, then the ISR should wake up the work function to go out and get the touch coordinates from the chip.
Putting some printk messages in might help you track down what is the issue.