mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-23 11:04:44 +08:00
4c57e379f4
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>
66 lines
2.2 KiB
Plaintext
66 lines
2.2 KiB
Plaintext
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/
|