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Date: Fri, 30 Jan 2009 14:10:17 +0100 From: Henrik Rydberg <rydberg@...omail.se> To: Joon Young Shim <dofmind@...il.com> CC: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 6/6] input: Add a detailed multi-touch finger data report protocol (rev2) Joon Young Shim wrote: > 2009/1/28 Henrik Rydberg <rydberg@...omail.se>: [snip] > > Hi Henrik, > > Sorry for multiple posts. > > I want to know how calculates touch coordinates at user space using a > set of ABS_MT. > If i do dual touch, can i get correct two coordinates through ABS_MT report? The coordinates for the two fingers are sent from the driver in sequence as two separate finger packets. What then happens with it depends on the kind of application. For normal desktop usage, the packets are read from the input device by the multitouch X driver (a modified version of the synaptics driver), which does finger matching and transforms the messages into gestures, reported as X events. It is of course also possible to read the input device directly. It goes without saying that further development is needed before the multitouch X driver hits the repos, but none of this can really become reality without basic support in the kernel. Henrik -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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