[PATCH 1/2] Add Variance filter

[Andy Green]

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Somebody in the thread at some point said:
| Andy, Nelson,
|
| with all your work on improving touchscreen in-kernel, what's your
take on
| tslib?

We don't do the calibration adjustment business in kernel, otherwise I
think you can just use the input event devices directly now: maybe give
it a try.

If you're thinking of binning tslib we can add the calibration stuff
easily enough via /sys that would accept whatever ts_calibrate issues.

- -Andy
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