projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 4c57e379 HR |
1 | BCM5974 Driver (bcm5974) |
| 2 | ------------------------ | |
| 3 | Copyright (C) 2008-2009 Henrik Rydberg <[email protected]> | |
| 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 ([email protected]) | |
| 8 | ||
| 9 | The BCM5974 driver is based on the appletouch driver: | |
| 10 | Copyright (C) 2001-2004 Greg Kroah-Hartman ([email protected]) | |
| 11 | Copyright (C) 2005 Johannes Berg ([email protected]) | |
| 12 | Copyright (C) 2005 Stelian Pop ([email protected]) | |
| 13 | Copyright (C) 2005 Frank Arnold ([email protected]) | |
| 14 | Copyright (C) 2005 Peter Osterlund ([email protected]) | |
| 15 | Copyright (C) 2005 Michael Hanselmann ([email protected]) | |
| 16 | Copyright (C) 2006 Nicolas Boichat ([email protected]) | |
| 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 | |
| 0ea6e611 | 65 | [2] http://bitmath.org/code/ |