[RFC] input: cap11xx: plasma globe proof

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Hey,

I built a raspberry-pi wakeup for my kids. Recently, one of them bought
a plasma globe. That globe leaves an electrostatic field that disturbes
the cap11xx when it operates with default settings.
So I grabbed the datasheet and started modifying the configuration.
This is the result that should apply to other scenarios as well.

The patch series improves the cap11xx in 2 ways.
It adds support for a cap1208 as on the explorer hat of Pimoroni,
and allows to run in polling mode (the explorer hat omitted the irq,
or I didn't find it).
It then exposes the major configuration parts of the chip so one can
tune it to her/his needs.

Please feel free to comment

Kind regards,
Kurt




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