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This lets libevdev provide a relatively generic interface for the
creation of uinput devices so we don't need to duplicate this across
multiple projects.
Most of this is lifted from the current test implementation, with a
couple of minor changes.
EV_REP needs special handling:
Kernel allows to set the EV_REP bit, it doesn't set REP_* bits (which we
wrap anyway) but it will also set the default values (500, 33).
Device node is guessed based on the sysfs path:
The sysfs path contains a eventN file, that corresponds to our
/dev/input/eventN number. Use it so clients can quickly get the device
node, without a libudev dependency.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
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