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