multi-touch limits?

[Rich_Morin]

tl;dr - what are the limits on multi-touch for the PinePhone?

I'm interested in supporting braille input on a PinePhone. Ideally, the user should be able to activate every possible dot in the braille cell. For six-dot braille, this would use three fingers on each hand; eight-dot braille would use four fingers on each hand. So, how many simultaneous locations can the PinePhone support?

Per the PinePhone touch screen controller GT917S datasheet, should able support up to ten points.

Thanks!  The datasheet contains a lot of useful-looking information. Moving up a level, can you point me to any information on APIs for the touch screen? In particular, do the various Linux flavors (e.g., Mobian, pmOS) all use the same API?