Re: [PATCH RESEND] USB HID: Add ID for eGalax Multitouch used in JooJoo tablet

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Le 16 août 10 à 15:58, Jiri Kosina a écrit :



thanks for the analysis. How do devices in their report descriptor
describe the fact whether the events should be interleaved by sync or not?

As far as I know, they don't. I know of two multitouch devices that send groups of fingers over several HID messages: - the 3M 22" panel, when there are more than 6 fingers on the panel. You know there are more messages coming when the number of fingers (reported through ContactCount in the first message) is greater than 6. - the eGalax 72xx series, that adds a second message whenever there are two fingers; I am not sure yet how one knows when to wait for a second message. Mathieu might be able to tell us.


The short term solution could be to add a .sync hook similar to .event. Each specific driver could override the call to input_sync () based on its knowledge of the device.


We definitely could create a specialized version of
hidinput_report_event() for certain reports, which wouldn't issue the
input_sync() call, but I wonder what is the distinguishing factor.

Yes, for months now I have wondered what the generic multitouch HID driver in Windows 7 might look like :-) I suspect that we now have a sufficient sample of devices (about 10 different ones, all claiming to be Win7 compliant) to extrapolate from their behaviour.

Cheers

St.

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