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    Subject[PATCH] input: Document the bcm5974 driver
    This patch adds documentation for the bcm5974 to Documentation/input/.

    Signed-off-by: Henrik Rydberg <>
    Documentation/input/bcm5974.txt | 65 +++++++++++++++++++++++++++++++++++++++
    1 files changed, 65 insertions(+), 0 deletions(-)
    create mode 100644 Documentation/input/bcm5974.txt

    diff --git a/Documentation/input/bcm5974.txt b/Documentation/input/bcm5974.txt
    new file mode 100644
    index 0000000..6db0763
    --- /dev/null
    +++ b/Documentation/input/bcm5974.txt
    @@ -0,0 +1,65 @@
    +BCM5974 Driver (bcm5974)
    + Copyright (C) 2008-2009 Henrik Rydberg <>
    +The USB initialization and package decoding was made by Scott Shawcroft as
    +part of the touchd user-space driver project:
    + Copyright (C) 2008 Scott Shawcroft (
    +The BCM5974 driver is based on the appletouch driver:
    + Copyright (C) 2001-2004 Greg Kroah-Hartman (
    + Copyright (C) 2005 Johannes Berg (
    + Copyright (C) 2005 Stelian Pop (
    + Copyright (C) 2005 Frank Arnold (
    + Copyright (C) 2005 Peter Osterlund (
    + Copyright (C) 2005 Michael Hanselmann (
    + Copyright (C) 2006 Nicolas Boichat (
    +This driver adds support for the multi-touch trackpad on the new Apple
    +Macbook Air and Macbook Pro laptops. It replaces the appletouch driver on
    +those computers, and integrates well with the synaptics driver of the Xorg
    +Known to work on Macbook Air, Macbook Pro Penryn and the new unibody
    +Macbook 5 and Macbook Pro 5.
    +The driver loads automatically for the supported usb device ids, and
    +becomes available both as an event device (/dev/input/event*) and as a
    +mouse via the mousedev driver (/dev/input/mice).
    +USB Race
    +The Apple multi-touch trackpads report both mouse and keyboard events via
    +different interfaces of the same usb device. This creates a race condition
    +with the HID driver, which, if not told otherwise, will find the standard
    +HID mouse and keyboard, and claim the whole device. To remedy, the usb
    +product id must be listed in the mouse_ignore list of the hid driver.
    +Debug output
    +To ease the development for new hardware version, verbose packet output can
    +be switched on with the debug kernel module parameter. The range [1-9]
    +yields different levels of verbosity. Example (as root):
    +rmmod bcm5974 && sudo modprobe bcm5974 debug=9
    +tail -f /var/log/debug
    +rmmod bcm5974 && sudo modprobe bcm5974 debug=0
    +The driver was developed at the ubuntu forums in June 2008 [1], and now has
    +a more permanent home at [2].
    +[2] http://

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