Based on kernel version 4.10.8. Page generated on 2017-04-01 14:43 EST.
1 BCM5974 Driver (bcm5974) 2 ------------------------ 3 Copyright (C) 2008-2009 Henrik Rydberg <rydberg@euromail.se> 4 5 The USB initialization and package decoding was made by Scott Shawcroft as 6 part of the touchd user-space driver project: 7 Copyright (C) 2008 Scott Shawcroft (scott.shawcroft@gmail.com) 8 9 The 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 18 This driver adds support for the multi-touch trackpad on the new Apple 19 Macbook Air and Macbook Pro laptops. It replaces the appletouch driver on 20 those computers, and integrates well with the synaptics driver of the Xorg 21 system. 22 23 Known to work on Macbook Air, Macbook Pro Penryn and the new unibody 24 Macbook 5 and Macbook Pro 5. 25 26 Usage 27 ----- 28 29 The driver loads automatically for the supported usb device ids, and 30 becomes available both as an event device (/dev/input/event*) and as a 31 mouse via the mousedev driver (/dev/input/mice). 32 33 USB Race 34 -------- 35 36 The Apple multi-touch trackpads report both mouse and keyboard events via 37 different interfaces of the same usb device. This creates a race condition 38 with the HID driver, which, if not told otherwise, will find the standard 39 HID mouse and keyboard, and claim the whole device. To remedy, the usb 40 product id must be listed in the mouse_ignore list of the hid driver. 41 42 Debug output 43 ------------ 44 45 To ease the development for new hardware version, verbose packet output can 46 be switched on with the debug kernel module parameter. The range [1-9] 47 yields different levels of verbosity. Example (as root): 48 49 echo -n 9 > /sys/module/bcm5974/parameters/debug 50 51 tail -f /var/log/debug 52 53 echo -n 0 > /sys/module/bcm5974/parameters/debug 54 55 Trivia 56 ------ 57 58 The driver was developed at the ubuntu forums in June 2008 [1], and now has 59 a more permanent home at bitmath.org [2]. 60 61 Links 62 ----- 63 64 [1] http://ubuntuforums.org/showthread.php?t=840040 65 [2] http://bitmath.org/code/