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94 lines
3.2 KiB
94 lines
3.2 KiB
.. include:: <isonum.txt> |
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Apple Touchpad Driver (appletouch) |
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:Copyright: |copy| 2005 Stelian Pop <[email protected]> |
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appletouch is a Linux kernel driver for the USB touchpad found on post |
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February 2005 and October 2005 Apple Aluminium Powerbooks. |
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This driver is derived from Johannes Berg's appletrackpad driver [#f1]_, |
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but it has 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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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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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 [#f2]_), and configure |
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a 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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.. [#f1] http://johannes.sipsolutions.net/PowerBook/touchpad/ |
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.. [#f2] `<http://web.archive.org/web/*/http://web.telia.com/~u89404340/touchpad/index.html>`_
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