[PATCH libinput 0/8] tablet pressure offsets and calibration matrix

[Peter Hutterer]

This series adds two missing features, pressure offset (6/8) and the use of
the calibration matrix for tablets (8/8). 

Pressure offsets deal with worn-out stylus nibs, unlike the X.Org driver
which tries to detect this automatically (and thus needs a config option to
turn the automatic detection off) I decided to make this a udev property
instead and delegate the task of measuring the pressure offset to
an external calibration tool.

Cheers,
  Peter