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     atp — Apple touchpad driver


     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



     The atp 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.

     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.

     There is support for 2-finger horizontal scrolling, which translates to page-back/forward
     events; vertical multi-finger scrolling emulates the mouse wheel.

     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 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.
     Smaller values of 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 hw.usb.atp.small_movement.  The maximum tolerable duration of a touch gesture
     is controlled by 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 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 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


     The atp driver provides support for the following Product IDs:

        PowerBooks, iBooks (IDs: 0x020e, 0x020f, 0x0210, 0x0214, 0x0215, 0x0216)
        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)
        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,

     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.


     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.


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


     The atp driver was written by Rohit Grover <>.