Calibrate touchpad pressures for Pit

One of the contributing factors to the cursor jumpiness and the missing
tap-to-clicks seems to be the fact that the pressures have not been
calibrated for Pit yet.  This must be redone anytime the firmware has
changed (or some of its features in the config that have to do with
pressure) but the new config looks good and I'm trying to get all the
low-hanging fruit quickly so the dogfooders can use their devices
while I'm picking off the stragglers.  These values were calibrated
using Adlr's probes and formulas to fit a line to the pressures (the
same way as for the other devices).

This is also required for the regression test suite to work properly for
a new platform, so it's important to add this in or I won't be able to
write and regression tests for Pit.

BUG=chrome-os-partner:22131
TEST=manual testing on a Pit DVT1.  The cursor moved smoothly and TTC
perfomance was marginally improved.

Original-Change-Id: If0a85f3904d6b6f51b75383a4576d8e4e0e0aafe
Originally-Signed-off-by: Charlie Mooney <charliemooney@chromium.org>
Originally-Reviewed-on: https://chromium-review.googlesource.com/168310
Originally-Reviewed-by: Benson Leung <bleung@chromium.org>
(cherry picked from commit ee2174f91fdad605176a8f0418366c04cdbf6294)

Change-Id: I6447aa4f59eb8385aa185673bcf3741ac755f65e
Signed-off-by: Charlie Mooney <charliemooney@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/169321
Reviewed-by: Benson Leung <bleung@chromium.org>
1 file changed