Thanks Fernando, this seemed to do the trick. I'm not sure why it
didn't work when I used the VendorSpecific Example, as that has the
values you mentioned, but.. I'll just assume I screwed something up
along the way.
Cheers,
Steve
On Mon, 24 Jan 2005 21:45:12 -0700, Fernando Urbina <email@hidden> wrote:
> On Jan 24, 2005, at 4:16 PM, Steve White wrote:
>
> > The peculiar problem is, the kext works on one machine - a PowerBook
> > G4 running 10.3.6, but do not work on another identical PowerBook nor
> > on a Sawtooth G4 running 10.3.7.
> >
> <snip>
>
> > IOKitPersonalities = {
> > "MCC-PMD-1024LS" = {
> > CFBundleIdentifier =
> > "edu.vanderbilt.fel.mendenhall.USB_Interface_Grabber";
> > IOClass = "USB_Interface_Grabber";
> > IOKitDebug = 0;
> > IOProviderClass = IOUSBInterface;
> > bConfigurationValue = 1;
> > bInterfaceNumber = 0;
> > idProduct = 118;
> > idVendor = 2523;
> > };
> >
> <snip>
>
> My educated guess on why it works in some machines and not some others
> is due to the fact that your "codeless" kext is looking for a CFBundle
> of "edu.vanderbilt.fel.mendenhall.USB_Interface_Grabber" and that
> module (wherever it comes from) is not present in one machine and not
> the others.
>
> The idea behind using a codeless kext in this case is to prevent the
> IOUSBHIDDriver from matching to the interface. The HID driver is
> "class" driver, so it matches at a relatively lower probe score (see
> http://developer.apple.com/qa/qa2001/qa1076.html for matching details).
> In order to prevent the HID driver from matching we need a kext that
> will (1) match with a higher probe score, and (2) return true from the
> start() method (so the kext is loaded).
>
> The easiest way to achieve this is to have a personality that specifies
> a vendor specific matching to your interface (or to your device if
> you're writing a device driver) and have it use IOKit as the "driver"
> for it. The way to do this is to specify:
>
> CFBundleIdentifier = " com.apple.kernel.iokit
> IOClass = "IOService"
>
> I trust that implementing it with those changes will yield the desired
> results.
>
> HTH,
> --
> Fernando Urbina
> USB Technology Team
> Apple Computer, Inc.
>
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