[PORT to 2.6.x] "Disable Trackpad while typing" on Notebooks with a PS/2 Trackpad

From: Hans-Georg Thien (1682-600_at_onlinehome.de)
Date: 09/30/03

  • Next message: Arun Sharma: "[PATCH] incorrect use of sizeof() in ioctl definitions" 
    Date:	Tue, 30 Sep 2003 22:51:54 +0200
To: linux-kernel@vger.kernel.org

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    I have written a patch against the linux 2.4.x kernel and I want to port
    it to the 2.6.x Kernel now.

    What it is
    - ----------
    The trackpad on the MacIntosh iBook notebooks have a feature that
    prevents unintended trackpad input while typing on the keyboard. There
    are no mouse-moves or mouse-taps for a short period of time after each
    keystroke.

    I thougt that was a nice-to-have for my i386 notebook and have
    implemented it ( with some very important help of other people, namely
    Torsten Foertsch ).

    This feature is fully configurable via a proc entry.

    How it currently works
    - ----------------------

    In the 2.4.x kernel the handling of keyboard and PS/2 mouse where both
    done in linux/drivers/char/pc_keyb.c. So it was easy to apply a patch
    without touching other files.

    It simply stores a timestamp whenever a key event occurs. If a mouse
    event occurs it compares the timestamp of the mouse event with stored
    timestamp of the key event. If the delta of these timestamps is less
    than a treshold value, than this mouse event is simply discarded. There
    where some things more to consider about, but I think you have the idea.

    Where I need help now
    - ---------------------
    Since I do not want to touch the keyboard driver, I wonder if there is
    better way to get the timestamp when the last keyboard event occured?

    Maybe a function call, a callback function where I can register to the
    be notified when a event occurs, a global accessible variable, a proc
    entry or something like that.

    Any ideas ?

    - - Hans

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  • Next message: Arun Sharma: "[PATCH] incorrect use of sizeof() in ioctl definitions"

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