ATP(4)

NAME
atp - Apple touchpad driver

SYNOPSIS
To compile this driver into the kernel, place the following lines into your kernel configuration file:

device atp
device usb

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

    atp_load="YES"

DESCRIPTION
The atp driver provides support for the Apple Internal Trackpad device found in many Apple laptops.

The driver simulates a three-button mouse using multi-finger tap detection. A 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. 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. atp attempts to filter away activity at the horizontal edges of the trackpad--this is to keep unintentional palm movement from being considered as user input.

atp supports dynamic reconfiguration using sysctl(8); through nodes under hw.usb.atp. Pointer sensitivity can be controlled using the sysctl tunable hw.usb.atp.scale_factor.

HARDWARE
The atp driver provides support for the following Product IDs:

•   Core Duo MacBook & MacBook Pro (IDs: 0x0217, 0x0218, 0x0219)
•   Core2 Duo MacBook & MacBook Pro (IDs: 0x021a, 0x021b, 0x021c)
•   Core2 Duo MacBook3,1 (IDs: 0x0229, 0x022a, 0x022b)
•   12 inch PowerBook and iBook (IDs: 0x030a, 0x030b)
•   15 inch PowerBook (IDs: 0x020e, 0x020f, 0x0215)
•   17 inch PowerBook (ID: 0x020d)

To discover the product-id of a touchpad, search for 'Trackpad' in the output of lshal(1) and look up the property usb_device.product_id.

FILES
atp creates a blocking pseudo-device file, /dev/atp0, which presents the mouse as a sysmouse or mousesystems type device--see moused(8) for an explanation of these mouse types. moused(8) can be configured to read touchpad data from /dev/atp0 and pass it along to the sysmouse(4) driver so that any process wanting to utilize mouse operation (such as an X server) may fetch it from /dev/sysmouse; alternatively, /dev/atp0 may be manipulated via read(2) and ioctl(2) calls to get mouse data directly.

EXAMPLES
To use a compatible Apple Trackpad as your console mouse:

    moused -p /dev/atp0 -t auto

To launch moused(8) automatically upon boot, add the following to /etc/rc.conf:

    moused_enable="YES"
    moused_type="auto"
    moused_port="/dev/atp0"

If you want moused(8) to also probe for external USB mice or other devices, then add the following to /etc/rc.conf:

    moused_nondefault_enable="YES"
    moused_ums0_enable="YES"
    moused_ums1_enable="YES"

To be able to use the trackpad under X, change the "Pointer" section in xorg.conf to the following:

    Device /dev/atp0
    Protocol Auto

Better still, if you want to be able to use the mouse in both virtual consoles as well as in X change it to:

    Device /dev/sysmouse
    Protocol Auto

SEE ALSO
sysmouse(4), usb(4), loader.conf(5), xorg.conf(5) (ports/x11/xorg), moused(8), sysctl(8).

AUTHORS
-nosplit The atp driver was written by Rohit Grover <rgrover1@gmail.com>