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Good point, that's actually what I did earlier in my much sloppier version.  I'll rewrite this patch.

Stéphane Chatty wrote:

Le 17 juin 09 à 07:50, Rafi Rubin a écrit :

quoted

When both touch and pen are active send a tool announcement before
sending any status changes so that event users may differentiate
which tool is changing.

With my multitouch-enabled TouchSmart tx2 (firwmare 4.2.17.8.5, finally
found it!) I get a series of ten BTN_TOOL_DOUBLETAP (value = 0 then 1,
five times) in every event. This is because the device emits HID_GD_X
several times in every event, whatever the real number of touches on the
screen.

The way to avoid this would be to delay the emission of your
BTN_TOOL_DOUBLETAP as I did for ABS_X and ABS_Y, that is when we receive
HID_DG_HEIGHT (single touch firmware) or 0xff000002 (multi-touch firmware)

St.

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