Revision 5885b9b3f030f9b430f6b1c7fa396c885033f2f8 authored by Linus Torvalds on 16 December 2011, 19:14:42 UTC, committed by Linus Torvalds on 16 December 2011, 19:14:42 UTC
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
ALSA: HDA: Use LPIB Position fix for Intel SCH Poulsbo
ALSA: hda: fix mute led polarity for HP laptops with buggy BIOS
ALSA: HDA: Set position fix to LPIB for an Atom/Poulsbo based device
ASoC: Fix hx4700 error handling to free gpios if snd_soc_register_card fails
ASoC: WM8958: correctly show firmware magic on mismatch
ASoC: mxs: Add appropriate MODULE_ALIAS()
ASoC: mxs: Add missing MODULE_LICENSE("GPL")
ASoC: Fix WM8996 24.576MHz clock operation
ASoC: Include linux/module.h for smdk2443_wm9710
ASoC: Fix a typo in jive_wm8750
ASoC: Fix build dependency for SND_SOC_JZ4740_CODEC
ASoC: Include linux/io.h for jz4740 codec
appletouch.txt
Apple Touchpad Driver (appletouch)
----------------------------------
Copyright (C) 2005 Stelian Pop <stelian@popies.net>
appletouch is a Linux kernel driver for the USB touchpad found on post
February 2005 and October 2005 Apple Aluminium Powerbooks.
This driver is derived from Johannes Berg's appletrackpad driver[1], but it has
been improved in some areas:
* appletouch is a full kernel driver, no userspace program is necessary
* appletouch can be interfaced with the synaptics X11 driver, in order
to have touchpad acceleration, scrolling, etc.
Credits go to Johannes Berg for reverse-engineering the touchpad protocol,
Frank Arnold for further improvements, and Alex Harper for some additional
information about the inner workings of the touchpad sensors. Michael
Hanselmann added support for the October 2005 models.
Usage:
------
In order to use the touchpad in the basic mode, compile the driver and load
the module. A new input device will be detected and you will be able to read
the mouse data from /dev/input/mice (using gpm, or X11).
In X11, you can configure the touchpad to use the synaptics X11 driver, which
will give additional functionalities, like acceleration, scrolling, 2 finger
tap for middle button mouse emulation, 3 finger tap for right button mouse
emulation, etc. In order to do this, make sure you're using a recent version of
the synaptics driver (tested with 0.14.2, available from [2]), and configure a
new input device in your X11 configuration file (take a look below for an
example). For additional configuration, see the synaptics driver documentation.
Section "InputDevice"
Identifier "Synaptics Touchpad"
Driver "synaptics"
Option "SendCoreEvents" "true"
Option "Device" "/dev/input/mice"
Option "Protocol" "auto-dev"
Option "LeftEdge" "0"
Option "RightEdge" "850"
Option "TopEdge" "0"
Option "BottomEdge" "645"
Option "MinSpeed" "0.4"
Option "MaxSpeed" "1"
Option "AccelFactor" "0.02"
Option "FingerLow" "0"
Option "FingerHigh" "30"
Option "MaxTapMove" "20"
Option "MaxTapTime" "100"
Option "HorizScrollDelta" "0"
Option "VertScrollDelta" "30"
Option "SHMConfig" "on"
EndSection
Section "ServerLayout"
...
InputDevice "Mouse"
InputDevice "Synaptics Touchpad"
...
EndSection
Fuzz problems:
--------------
The touchpad sensors are very sensitive to heat, and will generate a lot of
noise when the temperature changes. This is especially true when you power-on
the laptop for the first time.
The appletouch driver tries to handle this noise and auto adapt itself, but it
is not perfect. If finger movements are not recognized anymore, try reloading
the driver.
You can activate debugging using the 'debug' module parameter. A value of 0
deactivates any debugging, 1 activates tracing of invalid samples, 2 activates
full tracing (each sample is being traced):
modprobe appletouch debug=1
or
echo "1" > /sys/module/appletouch/parameters/debug
Links:
------
[1]: http://johannes.sipsolutions.net/PowerBook/touchpad/
[2]: http://web.archive.org/web/*/http://web.telia.com/~u89404340/touchpad/index.html
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