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    SubjectRe: [PATCH 3/3] hid: 3m: Correct touchscreen emulation
    On 08/28/2010 05:56 PM, Stéphane Chatty wrote:

    >
    > Le 28 août 10 à 16:29, Henrik Rydberg a écrit :
    >
    >> The current code sometimes misses to report the last BTN_TOUCH event
    >> when multiple fingers are lifted simultaneously. With the
    >> introduction of MT slots, the tracking id is available to determine
    >> the oldest active contact.
    >
    > Hi Henrik,
    >
    > good job on exploiting the sync quirk!
    >
    > About the oldest active contact, I'm not so sure though. I don't have the device
    > with me but I remember that 3M recycle IDs, giving the lowest available ID to
    > any new finger; this means that the lowest ID is not always the oldest finger.


    Hi Stéphane,

    I think we use the term tracking id differently here. The HID_DG_CONTACTID is
    actually the slot id, and the tracking id is a sequential number, increased
    whenever the touch is new. I believe the patchset works correctly as long as
    there is less than 32768 new touches before releasing the oldest one. :-)

    Cheers,
    Henrik
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