[RFC libinput] Add dial input device support

PrasannaKumar Muralidharan prasannatsmkumar at gmail.com
Fri Feb 19 14:33:52 UTC 2016

> right. the approach we used for this was to have an API that exports the
> value in degrees and an API for get_value_discrete() or similarly named.
> Look up the libinput_event_pointer*axis* API to get an idea.

For several devices (example dimmers used for controlling lamps) value
in degrees is not useful. Exported value depends on device.


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