1 .. include:: <isonum.txt> 2 3 ---------------------------------- 4 Apple Touchpad Driver (appletouch) 5 ---------------------------------- 6 7 :Copyright: |copy| 2005 Stelian Pop <stelian@popies.net> 8 9 appletouch is a Linux kernel driver for the USB touchpad found on post 10 February 2005 and October 2005 Apple Aluminium Powerbooks. 11 12 This driver is derived from Johannes Berg's appletrackpad driver [#f1]_, 13 but it has been improved in some areas: 14 15 * appletouch is a full kernel driver, no userspace program is necessary 16 * appletouch can be interfaced with the synaptics X11 driver, in order 17 to have touchpad acceleration, scrolling, etc. 18 19 Credits go to Johannes Berg for reverse-engineering the touchpad protocol, 20 Frank Arnold for further improvements, and Alex Harper for some additional 21 information about the inner workings of the touchpad sensors. Michael 22 Hanselmann added support for the October 2005 models. 23 24 Usage 25 ----- 26 27 In order to use the touchpad in the basic mode, compile the driver and load 28 the module. A new input device will be detected and you will be able to read 29 the mouse data from /dev/input/mice (using gpm, or X11). 30 31 In X11, you can configure the touchpad to use the synaptics X11 driver, which 32 will give additional functionalities, like acceleration, scrolling, 2 finger 33 tap for middle button mouse emulation, 3 finger tap for right button mouse 34 emulation, etc. In order to do this, make sure you're using a recent version of 35 the synaptics driver (tested with 0.14.2, available from [#f2]_), and configure 36 a new input device in your X11 configuration file (take a look below for an 37 example). For additional configuration, see the synaptics driver documentation:: 38 39 Section "InputDevice" 40 Identifier "Synaptics Touchpad" 41 Driver "synaptics" 42 Option "SendCoreEvents" "true" 43 Option "Device" "/dev/input/mice" 44 Option "Protocol" "auto-dev" 45 Option "LeftEdge" "0" 46 Option "RightEdge" "850" 47 Option "TopEdge" "0" 48 Option "BottomEdge" "645" 49 Option "MinSpeed" "0.4" 50 Option "MaxSpeed" "1" 51 Option "AccelFactor" "0.02" 52 Option "FingerLow" "0" 53 Option "FingerHigh" "30" 54 Option "MaxTapMove" "20" 55 Option "MaxTapTime" "100" 56 Option "HorizScrollDelta" "0" 57 Option "VertScrollDelta" "30" 58 Option "SHMConfig" "on" 59 EndSection 60 61 Section "ServerLayout" 62 ... 63 InputDevice "Mouse" 64 InputDevice "Synaptics Touchpad" 65 ... 66 EndSection 67 68 Fuzz problems 69 ------------- 70 71 The touchpad sensors are very sensitive to heat, and will generate a lot of 72 noise when the temperature changes. This is especially true when you power-on 73 the laptop for the first time. 74 75 The appletouch driver tries to handle this noise and auto adapt itself, but it 76 is not perfect. If finger movements are not recognized anymore, try reloading 77 the driver. 78 79 You can activate debugging using the 'debug' module parameter. A value of 0 80 deactivates any debugging, 1 activates tracing of invalid samples, 2 activates 81 full tracing (each sample is being traced):: 82 83 modprobe appletouch debug=1 84 85 or:: 86 87 echo "1" > /sys/module/appletouch/parameters/debug 88 89 90 .. Links: 91 92 .. [#f1] http://johannes.sipsolutions.net/PowerBook/touchpad/ 93 94 .. [#f2] `<http://web.archive.org/web/*/http://web.telia.com/~u89404340/touchpad/index.html>`_
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