Various fixes

[JohnMH]

Honestly, I don't expect you to merge this since it changes the structure and scope, but there are a few fixes in there

[Dax89]

Hi! There is an official driver merged from kernel 4.18 and developed by @jwrdegoede

You can see it here: https://elixir.bootlin.com/linux/v4.18-rc3/source/drivers/input/touchscreen/chipone_icn8505.c

Discussion link (for reference): https://github.com/Dax89/chuwi-dev/issues/1

[JohnMH]

Didn't know, I no longer have this device, but figured the code may be useful.

[JohnMH]

Writing that with extremely limited documentation was very interesting.