Re: [PATCH 0/6] Add touch-keys support to the Zinitix touch driver

On Tue, Nov 9, 2021 at 4:23 PM Nikita Travkin [off-list ref] wrote:

[Me]

quoted

Have you notices some behaviour like surplus touch events
(like many press/release events fall through to the UI)
when using this driver? I think it might need some z fuzzing
but I am not sure.

On my device (8 inch tablet with BT532) I saw no problems with touch
so far. However another person with a different tablet (10 inch with
ZT7554)
indeed says that they notice "multiplied" touches that make typing hard
so maybe that depends on controller model/firmware...

It may even be depending on specimen. I saw that the vendor driver
does contain some debouncing code.

And speaking of that ZT7554: Seems like it's works with the driver
and I'd like to add the compatible for it in v2 but I'd also have to add
it to the bindings. Looking at how you add all other similar names for BT*
there does it make sense to add ZT* as well?

Yeah probably, if they are electrically very similar.

Maybe you have some hints where
to look for a list of the models?

I usually google ... try to find things like powerpoints with roadmaps
from the vendor and things like that. Best thing is if they answer
to mail but I don't know if Zinitix are even around anymore.

I've noticed a yet another quirky issue with the touch controller:
At least on my device, for some reason enabling touchkeys changes the
way the
controller reports the finger touch events which breaks multi-touch...
Assuming that *not* enabling the touchkeys leads to calibration being
wrong
(controller assigns the touchkey sense lines to the touch area in that
case)
I now have to resolve this quirk as well...

Hm yeah I guess refer to the (messy) vendor driver for hints.

Yours,
Linus Walleij