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bcm5974.txt

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  1. BCM5974 Driver (bcm5974)
    2. 

  2. ------------------------
    3. 

  3. 	Copyright (C) 2008-2009	Henrik Rydberg <rydberg@euromail.se>
    4. 

  4. 

  5. The USB initialization and package decoding was made by Scott Shawcroft as
    6. 

  6. part of the touchd user-space driver project:
    7. 

  7. 	Copyright (C) 2008	Scott Shawcroft (scott.shawcroft@gmail.com)
    8. 

  8. 

  9. The BCM5974 driver is based on the appletouch driver:
    10. 

  10. 	Copyright (C) 2001-2004	Greg Kroah-Hartman (greg@kroah.com)
    11. 

  11. 	Copyright (C) 2005	Johannes Berg (johannes@sipsolutions.net)
    12. 

  12. 	Copyright (C) 2005	Stelian Pop (stelian@popies.net)
    13. 

  13. 	Copyright (C) 2005	Frank Arnold (frank@scirocco-5v-turbo.de)
    14. 

  14. 	Copyright (C) 2005	Peter Osterlund (petero2@telia.com)
    15. 

  15. 	Copyright (C) 2005	Michael Hanselmann (linux-kernel@hansmi.ch)
    16. 

  16. 	Copyright (C) 2006	Nicolas Boichat (nicolas@boichat.ch)
    17. 

  17. 

  18. This driver adds support for the multi-touch trackpad on the new Apple
    19. 

  19. Macbook Air and Macbook Pro laptops. It replaces the appletouch driver on
    20. 

  20. those computers, and integrates well with the synaptics driver of the Xorg
    21. 

  21. system.
    22. 

  22. 

  23. Known to work on Macbook Air, Macbook Pro Penryn and the new unibody
    24. 

  24. Macbook 5 and Macbook Pro 5.
    25. 

  25. 

  26. Usage
    27. 

  27. -----
    28. 

  28. 

  29. The driver loads automatically for the supported usb device ids, and
    30. 

  30. becomes available both as an event device (/dev/input/event*) and as a
    31. 

  31. mouse via the mousedev driver (/dev/input/mice).
    32. 

  32. 

  33. USB Race
    34. 

  34. --------
    35. 

  35. 

  36. The Apple multi-touch trackpads report both mouse and keyboard events via
    37. 

  37. different interfaces of the same usb device. This creates a race condition
    38. 

  38. with the HID driver, which, if not told otherwise, will find the standard
    39. 

  39. HID mouse and keyboard, and claim the whole device. To remedy, the usb
    40. 

  40. product id must be listed in the mouse_ignore list of the hid driver.
    41. 

  41. 

  42. Debug output
    43. 

  43. ------------
    44. 

  44. 

  45. To ease the development for new hardware version, verbose packet output can
    46. 

  46. be switched on with the debug kernel module parameter. The range [1-9]
    47. 

  47. yields different levels of verbosity. Example (as root):
    48. 

  48. 

  49. echo -n 9 > /sys/module/bcm5974/parameters/debug
    50. 

  50. 

  51. tail -f /var/log/debug
    52. 

  52. 

  53. echo -n 0 > /sys/module/bcm5974/parameters/debug
    54. 

  54. 

  55. Trivia
    56. 

  56. ------
    57. 

  57. 

  58. The driver was developed at the ubuntu forums in June 2008 [1], and now has
    59. 

  59. a more permanent home at bitmath.org [2].
    60. 

  60. 

  61. Links
    62. 

  62. -----
    63. 

  63. 

  64. [1] http://ubuntuforums.org/showthread.php?t=840040
    65. 

  65. [2] http://bitmath.org/code/
    66.