Does this hack work for devices that break the USB spec in some
subtle way?
I would not categorize this as a hack. It is a recommended and
supported way of preventing drivers from matching to a device. Hack
implies something that is unsupported and bound to break in future
releases of the OS.
The reason I ask is that I am looking for a way to use the Polar IR
device (with the USB connector obviously). Others have noted that it
does not comply with the USB specifications, but I'm not sure exactly
how.
Would a code-less kext be able to prevent Mac OS X from claiming it,
and allow a user-space program/thread to communicate with it?
As David responded, the Polar IR device had trouble enumerating. I
don't recall exactly what the failure mode was. However, under
10.3.9 and Tiger we did add some compatibilty code to deal with
devices that do not follow section 9.3.5 of the spec.
Surely if MS Windows can load drivers for it, it couldn't break the
USB spec too severly??
That's like saying that you're half pregnant. Either you follow the
spec or you don't. Non-compliant devices are sometimes tested
(especially early ones) on particular releases of Windows and do not
go through the USB Compliance certification.
Regards,
--
Fernando Urbina
USB Technology Team
Apple Computer, Inc.
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