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Add button mappings for two- and three-finger clicks on clickpads.

Based on a proposal of tobhe@.

ok tobhe@

.\" $OpenBSD: wsmouse.4,v 1.23 2023/07/02 21:44:04 bru Exp $
.\" $NetBSD: wsmouse.4,v 1.3 1999/12/06 14:52:08 augustss Exp $
.\"
.\" Copyright (c) 2018 Ulf Brosziewski <bru@openbsd.org>
.\" Copyright (c) 1999
.\" 	Matthias Drochner.  All rights reserved.
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.Dd $Mdocdate: July 2 2023 $
.Dt WSMOUSE 4
.Os
.Sh NAME
.Nm wsmouse
.Nd generic mouse support in wscons
.Sh SYNOPSIS
.Cd "wsmouse* at ..."
.Sh DESCRIPTION
The
.Nm
driver is an abstraction layer for mice and other pointing devices within the
.Xr wscons 4
framework.
It is attached to the hardware specific drivers and
provides a character device interface which returns
.Fa struct wscons_event
via
.Xr read 2 .
For use with X servers,
.Dq mouse events
or
.Dq touch events
can be generated.
.Pp
The
.Nm
driver provides a number of ioctl functions to control various parameters (see
.Pa /usr/include/dev/wscons/wsconsio.h ) .
The
.Xr wsconsctl 8
utility gives access to these variables.
.Pp
Touchpad input is processed in one of two modes:
In
.Dq absolute mode ,
the
.Nm
driver generates touch events.
Absolute mode is activated by
.Xr synaptics 4 .
In
.Dq compatibility mode ,
which is the default,
.Nm
converts the input internally and generates mouse events.
.Xr wsconsctl 8
can query and set several configuration parameters for this mode.
The composite field names have the form
.Cm mouse Ns Oo Ar N Oc . Ns Cm tp . Ns Ar field
where
.Ar N
is the index of the
.Nm
device.
If
.Ar N
is omitted, commands apply to
.Pa /dev/wsmouse0 .
.Bl -tag -width Ds
.It Cm mouse.tp.tapping
Contacts on the touchpad that are immediately released again can
be mapped to mouse button clicks.
This list of three parameters configures these mappings, in the order:
.Bd -literal -offset indent
.Sm off
.Ar one-finger , two-finger , three-finger
.Sm on
.Ed
.Pp
Setting a parameter to a positive value enables that tap gesture
and maps it to the given mouse button.
To disable all three tap gestures at once, provide the single value of 0.
Conversely, a single non-zero value will enable one-finger, two-finger, and
three-finger tap gestures with their default mappings of left
button, right button, and middle button, respectively.
If, within a short time interval, a second touch follows a tap gesture
mapped to a left-button click, the button-up event is not issued
until that touch ends
.Pq Dq tap-and-drag .
.It Cm mouse.tp.mtbuttons
This feature is supported for some clickpads.
If enabled, two-finger clicks - with the fingers side by side - generate
left-button events, and three-finger clicks generate middle-button events.
.It Cm mouse.tp.scaling
The value is a scale coefficient that is applied to the relative
coordinates.
It determines the base speed of the pointer.
.It Cm mouse.tp.swapsides
If this parameter has a non-zero value, the order of software
button areas is inverted.
If edge scrolling is enabled, the scroll area is set up at the left
edge of the touchpad.
.It Cm mouse.tp.disable
A non-zero value disables pointer movement, tapping, and scrolling.
Software buttons (and external physical buttons) will work as usual.
.It Cm mouse.tp.edges
This field contains a list of four values that define the relative
sizes of the edge areas, in the order:
.Bd -literal -offset indent
.Sm off
.Ar top , right , bottom , left
.Sm on
.Ed
.Pp
The unit is percent of the total height of the touchpad surface, or
of its total width, respectively.
In order to mitigate the effects of accidental touches, the driver
ignores most types of input from an edge area (see below).
If an edge area contains software buttons, they fill up the space
provided.
.El
.Pp
The automatic configuration enables two-finger scrolling and sets up
edge areas at the vertical edges.
On clickpads - where the device surface serves as a single, large
button - it provides three software button areas at the bottom edge,
for left-button, middle-button, and right-button clicks.
On some laptops with a trackpoint, the software buttons are at the
top edge.
Vertical edge scrolling will be enabled on older touchpads that do not
report contact counts.
.Pp
A touch that starts and remains in an edge area does not trigger pointer
movement.
At the vertical edges and the top edge, tapping and two-finger scrolling
require that at least one touch is in the main area of the touchpad (the
exact behaviour of a single-touch device depends on its firmware in this
case).
When multi-touch input is available, a touch is ignored if it rests in
the bottom area while there are other inputs - movement, scrolling, or
tapping -, and the driver continues to ignore it as long as and whenever
other touches are present.
.Sh FILES
.Bl -tag -width /usr/include/dev/wscons/wsconsio.h -compact
.It Pa /dev/wsmouse*
.It Pa /usr/include/dev/wscons/wsconsio.h
.El
.Sh SEE ALSO
.Xr ams 4 ,
.Xr hilms 4 ,
.Xr intro 4 ,
.Xr lms 4 ,
.Xr mms 4 ,
.Xr pms 4 ,
.Xr ubcmtp 4 ,
.Xr ums 4 ,
.Xr utpms 4 ,
.Xr wscons 4 ,
.Xr wsmux 4 ,
.Xr wsconsctl 8 ,
.Xr wsmoused 8