altos/driver: Add support for one-step-per-click quadrature encoder
authorKeith Packard <keithp@keithp.com>
Mon, 28 May 2018 21:15:34 +0000 (14:15 -0700)
committerKeith Packard <keithp@keithp.com>
Mon, 28 May 2018 21:15:34 +0000 (14:15 -0700)
The mechanical encoders go through all four steps per click while the
optical ones have a single step per click. Support both kinds.

Signed-off-by: Keith Packard <keithp@keithp.com>

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