K 10
svn:author
V 4
wulf
K 8
svn:date
V 27
2019-06-03T10:04:34.884221Z
K 7
svn:log
V 608
psm(4): Add natural scrolling support to sysmouse protocol

This change enables natural scrolling with two finger scroll enabled
and when user is using a trackpad (mouse and trackpoint are not affected).
Depending on trackpad model it can be activated with setting of
hw.psm.synaptics.natural_scroll or hw.psm.elantech.natural_scroll sysctl
values to 1.

Evdev protocol is not affected by this change too. Tune userland client
e.g. libinput to enable natural scrolling in that case.

Submitted by:	nyan_myuji.xyz
Reviewed by:	wulf
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D20447

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