bcm5974.rst (2391B)
1.. include:: <isonum.txt> 2 3------------------------ 4BCM5974 Driver (bcm5974) 5------------------------ 6 7:Copyright: |copy| 2008-2009 Henrik Rydberg <rydberg@euromail.se> 8 9The USB initialization and package decoding was made by Scott Shawcroft as 10part of the touchd user-space driver project: 11 12:Copyright: |copy| 2008 Scott Shawcroft (scott.shawcroft@gmail.com) 13 14The BCM5974 driver is based on the appletouch driver: 15 16:Copyright: |copy| 2001-2004 Greg Kroah-Hartman (greg@kroah.com) 17:Copyright: |copy| 2005 Johannes Berg (johannes@sipsolutions.net) 18:Copyright: |copy| 2005 Stelian Pop (stelian@popies.net) 19:Copyright: |copy| 2005 Frank Arnold (frank@scirocco-5v-turbo.de) 20:Copyright: |copy| 2005 Peter Osterlund (petero2@telia.com) 21:Copyright: |copy| 2005 Michael Hanselmann (linux-kernel@hansmi.ch) 22:Copyright: |copy| 2006 Nicolas Boichat (nicolas@boichat.ch) 23 24This driver adds support for the multi-touch trackpad on the new Apple 25Macbook Air and Macbook Pro laptops. It replaces the appletouch driver on 26those computers, and integrates well with the synaptics driver of the Xorg 27system. 28 29Known to work on Macbook Air, Macbook Pro Penryn and the new unibody 30Macbook 5 and Macbook Pro 5. 31 32Usage 33----- 34 35The driver loads automatically for the supported usb device ids, and 36becomes available both as an event device (/dev/input/event*) and as a 37mouse via the mousedev driver (/dev/input/mice). 38 39USB Race 40-------- 41 42The Apple multi-touch trackpads report both mouse and keyboard events via 43different interfaces of the same usb device. This creates a race condition 44with the HID driver, which, if not told otherwise, will find the standard 45HID mouse and keyboard, and claim the whole device. To remedy, the usb 46product id must be listed in the mouse_ignore list of the hid driver. 47 48Debug output 49------------ 50 51To ease the development for new hardware version, verbose packet output can 52be switched on with the debug kernel module parameter. The range [1-9] 53yields different levels of verbosity. Example (as root):: 54 55 echo -n 9 > /sys/module/bcm5974/parameters/debug 56 57 tail -f /var/log/debug 58 59 echo -n 0 > /sys/module/bcm5974/parameters/debug 60 61Trivia 62------ 63 64The driver was developed at the ubuntu forums in June 2008 [#f1]_, and now has 65a more permanent home at bitmath.org [#f2]_. 66 67.. Links 68 69.. [#f1] http://ubuntuforums.org/showthread.php?t=840040 70.. [#f2] http://bitmath.org/code/