2005-09-08 16:19:48 +08:00
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Apple Touchpad Driver (appletouch)
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----------------------------------
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Copyright (C) 2005 Stelian Pop <stelian@popies.net>
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appletouch is a Linux kernel driver for the USB touchpad found on post
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2005-12-21 13:50:23 +08:00
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February 2005 and October 2005 Apple Aluminium Powerbooks.
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2005-09-08 16:19:48 +08:00
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This driver is derived from Johannes Berg's appletrackpad driver[1], but it has
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been improved in some areas:
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* appletouch is a full kernel driver, no userspace program is necessary
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* appletouch can be interfaced with the synaptics X11 driver, in order
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to have touchpad acceleration, scrolling, etc.
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Credits go to Johannes Berg for reverse-engineering the touchpad protocol,
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Frank Arnold for further improvements, and Alex Harper for some additional
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2005-12-21 13:50:23 +08:00
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information about the inner workings of the touchpad sensors. Michael
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Hanselmann added support for the October 2005 models.
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2005-09-08 16:19:48 +08:00
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Usage:
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------
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In order to use the touchpad in the basic mode, compile the driver and load
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the module. A new input device will be detected and you will be able to read
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the mouse data from /dev/input/mice (using gpm, or X11).
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In X11, you can configure the touchpad to use the synaptics X11 driver, which
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will give additional functionalities, like acceleration, scrolling, 2 finger
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tap for middle button mouse emulation, 3 finger tap for right button mouse
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emulation, etc. In order to do this, make sure you're using a recent version of
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the synaptics driver (tested with 0.14.2, available from [2]), and configure a
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new input device in your X11 configuration file (take a look below for an
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example). For additional configuration, see the synaptics driver documentation.
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Section "InputDevice"
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Identifier "Synaptics Touchpad"
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Driver "synaptics"
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Option "SendCoreEvents" "true"
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Option "Device" "/dev/input/mice"
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Option "Protocol" "auto-dev"
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Option "LeftEdge" "0"
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Option "RightEdge" "850"
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Option "TopEdge" "0"
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Option "BottomEdge" "645"
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Option "MinSpeed" "0.4"
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Option "MaxSpeed" "1"
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Option "AccelFactor" "0.02"
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Option "FingerLow" "0"
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Option "FingerHigh" "30"
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Option "MaxTapMove" "20"
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Option "MaxTapTime" "100"
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Option "HorizScrollDelta" "0"
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Option "VertScrollDelta" "30"
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Option "SHMConfig" "on"
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EndSection
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Section "ServerLayout"
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...
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InputDevice "Mouse"
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InputDevice "Synaptics Touchpad"
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...
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EndSection
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Fuzz problems:
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--------------
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The touchpad sensors are very sensitive to heat, and will generate a lot of
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noise when the temperature changes. This is especially true when you power-on
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the laptop for the first time.
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The appletouch driver tries to handle this noise and auto adapt itself, but it
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is not perfect. If finger movements are not recognized anymore, try reloading
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the driver.
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You can activate debugging using the 'debug' module parameter. A value of 0
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deactivates any debugging, 1 activates tracing of invalid samples, 2 activates
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full tracing (each sample is being traced):
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modprobe appletouch debug=1
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or
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echo "1" > /sys/module/appletouch/parameters/debug
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Links:
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------
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[1]: http://johannes.sipsolutions.net/PowerBook/touchpad/
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[2]: http://web.telia.com/~u89404340/touchpad/index.html
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