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Input: bcm5974 - add documentation for the driver

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This patch adds documentation for the bcm5974 to Documentation/input/.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Henrik Rydberg 2009-04-28 07:07:07 -07:00 committed by Dmitry Torokhov
parent 5340219317
commit 4c57e379f4
1 changed files with 65 additions and 0 deletions
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Documentation/input/bcm5974.txt Normal file
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BCM5974 Driver (bcm5974)
------------------------
Copyright (C) 2008-2009 Henrik Rydberg <rydberg@euromail.se>
The USB initialization and package decoding was made by Scott Shawcroft as
part of the touchd user-space driver project:
Copyright (C) 2008 Scott Shawcroft (scott.shawcroft@gmail.com)
The BCM5974 driver is based on the appletouch driver:
Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
Copyright (C) 2005 Johannes Berg (johannes@sipsolutions.net)
Copyright (C) 2005 Stelian Pop (stelian@popies.net)
Copyright (C) 2005 Frank Arnold (frank@scirocco-5v-turbo.de)
Copyright (C) 2005 Peter Osterlund (petero2@telia.com)
Copyright (C) 2005 Michael Hanselmann (linux-kernel@hansmi.ch)
Copyright (C) 2006 Nicolas Boichat (nicolas@boichat.ch)
This driver adds support for the multi-touch trackpad on the new Apple
Macbook Air and Macbook Pro laptops. It replaces the appletouch driver on
those computers, and integrates well with the synaptics driver of the Xorg
system.
Known to work on Macbook Air, Macbook Pro Penryn and the new unibody
Macbook 5 and Macbook Pro 5.
Usage
-----
The driver loads automatically for the supported usb device ids, and
becomes available both as an event device (/dev/input/event*) and as a
mouse via the mousedev driver (/dev/input/mice).
USB Race
--------
The Apple multi-touch trackpads report both mouse and keyboard events via
different interfaces of the same usb device. This creates a race condition
with the HID driver, which, if not told otherwise, will find the standard
HID mouse and keyboard, and claim the whole device. To remedy, the usb
product id must be listed in the mouse_ignore list of the hid driver.
Debug output
------------
To ease the development for new hardware version, verbose packet output can
be switched on with the debug kernel module parameter. The range [1-9]
yields different levels of verbosity. Example (as root):
echo -n 9 > /sys/module/bcm5974/parameters/debug
tail -f /var/log/debug
echo -n 0 > /sys/module/bcm5974/parameters/debug
Trivia
------
The driver was developed at the ubuntu forums in June 2008 [1], and now has
a more permanent home at bitmath.org [2].
Links
-----
[1] http://ubuntuforums.org/showthread.php?t=840040
[2] http://http://bitmath.org/code/