1BCM5974 Driver (bcm5974) 2------------------------ 3 Copyright (C) 2008-2009 Henrik Rydberg <rydberg@euromail.se> 4 5The USB initialization and package decoding was made by Scott Shawcroft as 6part of the touchd user-space driver project: 7 Copyright (C) 2008 Scott Shawcroft (scott.shawcroft@gmail.com) 8 9The BCM5974 driver is based on the appletouch driver: 10 Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com) 11 Copyright (C) 2005 Johannes Berg (johannes@sipsolutions.net) 12 Copyright (C) 2005 Stelian Pop (stelian@popies.net) 13 Copyright (C) 2005 Frank Arnold (frank@scirocco-5v-turbo.de) 14 Copyright (C) 2005 Peter Osterlund (petero2@telia.com) 15 Copyright (C) 2005 Michael Hanselmann (linux-kernel@hansmi.ch) 16 Copyright (C) 2006 Nicolas Boichat (nicolas@boichat.ch) 17 18This driver adds support for the multi-touch trackpad on the new Apple 19Macbook Air and Macbook Pro laptops. It replaces the appletouch driver on 20those computers, and integrates well with the synaptics driver of the Xorg 21system. 22 23Known to work on Macbook Air, Macbook Pro Penryn and the new unibody 24Macbook 5 and Macbook Pro 5. 25 26Usage 27----- 28 29The driver loads automatically for the supported usb device ids, and 30becomes available both as an event device (/dev/input/event*) and as a 31mouse via the mousedev driver (/dev/input/mice). 32 33USB Race 34-------- 35 36The Apple multi-touch trackpads report both mouse and keyboard events via 37different interfaces of the same usb device. This creates a race condition 38with the HID driver, which, if not told otherwise, will find the standard 39HID mouse and keyboard, and claim the whole device. To remedy, the usb 40product id must be listed in the mouse_ignore list of the hid driver. 41 42Debug output 43------------ 44 45To ease the development for new hardware version, verbose packet output can 46be switched on with the debug kernel module parameter. The range [1-9] 47yields different levels of verbosity. Example (as root): 48 49echo -n 9 > /sys/module/bcm5974/parameters/debug 50 51tail -f /var/log/debug 52 53echo -n 0 > /sys/module/bcm5974/parameters/debug 54 55Trivia 56------ 57 58The driver was developed at the ubuntu forums in June 2008 [1], and now has 59a more permanent home at bitmath.org [2]. 60 61Links 62----- 63 64[1] http://ubuntuforums.org/showthread.php?t=840040 65[2] http://bitmath.org/code/ 66