Bump.
Second vote for importing what's already in the mainline tree: https://github.com/micropython/micropython/blob/v1.9.4/ports/esp32/machine_touchpad.c
(it must be quite a lot of work for Pycom to maintain their own fork of MicroPython.. not to mention how the MicroPython world is starting to get a bit fragmented with all the forks now)