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Codeless Kext and USB HID

Greetings everybody,

I'm having difficulties using a codeless kext to prevent the Apple drivers from hijacking a HID device. I've read the mailing lists, have tried the sample that is provided in Xcode (in /Developer/Examples/Kernel/IOKit/usb/VendorSpecific Driver) as well as a few others I've found posted on various websites. 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.

I've verified the permissions of the kext, and all are correct. On all three machines, kextload gives the same response:

# kextload -v MCC_HID_Grabber.kext
kextload: extension MCC_HID_Grabber.kext appears to be valid
kextload: loading extension MCC_HID_Grabber.kext

But those two machines are being stubborn and not budging (They fail on the call to USBInterfaceOpen).

I've been advised that sending along the output of 'pl' is valuable. Unfortunately, I've gone through many variations and do not have the working Powerbook next to me at the moment. I believe this output is from the kext that worked on the one Powerbook, although I can't say for certain. I do know that it's essentially unmodified from the original source (a website), so if there's anything horribly wrong with it -- blame them, not me :)

The device in question is the 1208LS - Product ID 122, Vendor ID 2523.

Any help is greatly appreciated.

Thanks,
Steve

{
CFBundleDevelopmentRegion = English;
CFBundleExecutable = "MCC_HID_Grabber";
CFBundleGetInfoString = "shields listed interfaces from system acquisition";
CFBundleIdentifier = "edu.vanderbilt.fel.mendenhall.mccdriver";
CFBundleInfoDictionaryVersion = "6.0";
CFBundleName = "USB Interface grabber";
CFBundlePackageType = KEXT;
CFBundleSignature = "????";
CFBundleVersion = "6.0";
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;
};
"MCC-PMD-1208LS" = {
CFBundleIdentifier = "edu.vanderbilt.fel.mendenhall.USB_Interface_Grabber";
IOClass = "USB_Interface_Grabber";
IOKitDebug = 0;
IOProviderClass = IOUSBInterface;
bConfigurationValue = 1;
bInterfaceNumber = 0;
idProduct = 122;
idVendor = 2523;
};
"MCC-miniLAB-1008LS" = {
CFBundleIdentifier = "edu.vanderbilt.fel.mendenhall.USB_Interface_Grabber";
IOClass = "USB_Interface_Grabber";
IOKitDebug = 0;
IOProviderClass = IOUSBInterface;
bConfigurationValue = 1;
bInterfaceNumber = 0;
idProduct = 117;
idVendor = 2523;
};
};
OSBundleLibraries = {"com.apple.iokit.IOUSBFamily" = "1.8"; };
}

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