.\" Copyright (c) 2014 Rohit Grover <rgrover1 at gmail dot com>.
.\" All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" $FreeBSD$
.\"
.Dd February 24, 2014
.Dt ATP 4
.Os
.Sh NAME
.Nm atp
.Nd Apple touchpad driver
.Sh SYNOPSIS
To compile this driver into the kernel, place the following lines into
your kernel configuration file:
.Bd -ragged -offset indent
.Cd "device atp"
.Cd "device hid"
.Cd "device usb"
.Ed
.Pp
Alternatively, to load the driver as a module at boot time, place the following line in
.Xr loader.conf 5 :
.Bd -literal -offset indent
atp_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
driver provides support for the Apple Internal Trackpad device found in many
Apple laptops.
Older (Fountain/Geyser) and the newer (Wellspring) trackpad
families are all supported through a unified driver.
.Pp
The driver simulates a three\-button mouse using multi\-finger tap detection.
Single finger tap generates a left\-button click; two\-finger tap maps to the
middle button; whereas a three\-finger tap gets treated as a right button
click.
.Pp
There is support for 2\-finger horizontal scrolling, which translates to
page\-back/forward events; vertical multi\-finger scrolling emulates the mouse
wheel.
.Pp
A double\-tap followed by a drag is treated as a selection gesture; a
virtual left\-button click is assumed for the lifespan of the drag.
.Pp
.Nm
supports dynamic reconfiguration using
.Xr sysctl 8 ;
through nodes under
.Nm hw.usb.atp .
Pointer sensitivity can be controlled using the sysctl tunable
.Nm hw.usb.atp.scale_factor .
Smaller values of
.Fa scale_factor
result in faster movement.
.
A simple high-pass filter is used to reduce contributions
from small movements; the threshold for this filter may be controlled by
.Nm hw.usb.atp.small_movement .
.
The maximum tolerable duration of a touch gesture is controlled by
.Nm hw.usb.atp.touch_timeout
(in microseconds); beyond this period, touches are considered to be slides.
(This conversion also happens when a finger stroke accumulates at least
.Nm hw.usb.atp.slide_min_movement
movement (in mickeys).
.
The maximum time (in microseconds) to allow an association between a double-
tap and drag gesture may be controlled by
.Nm hw.usb.atp.double_tap_threshold .
.
Should one want to disable tap detection and rely only upon physical button
presses, set the following sysctl to a value of 2
.Nm hw.usb.atp.tap_minimum .
.
.Sh HARDWARE
The
.Nm
driver provides support for the following Product IDs:
.Pp
.Bl -bullet -compact
.It
PowerBooks, iBooks (IDs: 0x020e, 0x020f, 0x0210, 0x0214, 0x0215, 0x0216)
.It
Core Duo MacBook & MacBook Pro (IDs: 0x0217, 0x0218, 0x0219)
.It
Core2 Duo MacBook & MacBook Pro (IDs: 0x021a, 0x021b, 0x021c)
.It
Core2 Duo MacBook3,1 (IDs: 0x0229, 0x022a, 0x022b)
.It
12 inch PowerBook and iBook (IDs: 0x030a, 0x030b)
.It
15 inch PowerBook (IDs: 0x020e, 0x020f, 0x0215)
.It
17 inch PowerBook (ID: 0x020d)
.It
Almost all recent Macbook-Pros and Airs (IDs: 0x0223, 0x0223, 0x0224, 0x0224,
0x0225, 0x0225, 0x0230, 0x0230, 0x0231, 0x0231, 0x0232, 0x0232, 0x0236,
0x0236, 0x0237, 0x0237, 0x0238, 0x0238, 0x023f, 0x023f, 0x0240, 0x0241,
0x0242, 0x0243, 0x0244, 0x0245, 0x0246, 0x0247, 0x0249, 0x024a, 0x024b,
0x024c, 0x024d, 0x024e, 0x0252, 0x0252, 0x0253, 0x0253, 0x0254, 0x0254,
0x0259, 0x025a, 0x025b, 0x0262, 0x0262, 0x0263, 0x0264, 0x0290, 0x0291,
0x0292)
.El
.Pp
To discover the product\-id of a touchpad, search for 'Trackpad' in the
output of
.Xr lshal 1
and look up the property
.Nm usb_device.product_id .
.Sh FILES
.Nm
creates a blocking pseudo\-device file,
.Pa /dev/atp0 ,
which presents the mouse as a
.Ar sysmouse
or
.Ar mousesystems
type device\-\-see
.Xr moused 8
for an explanation of these mouse
types.
.Sh SEE ALSO
.Xr sysmouse 4 ,
.Xr usb 4 ,
.Xr loader.conf 5 ,
.Xr xorg.conf 5 Pq Pa ports/x11/xorg ,
.Xr moused 8 ,
.Xr sysctl 8
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Rohit Grover Aq Mt rgrover1@gmail.com .
