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Re: Preventing IOUSBHIDDriver From Claiming a Device

Brandon,

The solution is to implement a Codeless Kext. This is a Kernel Extension which has only a plist - which would be something like follows here. In the following, I present a codeless kext which keeps the white apple keyboard from matching to the default HID driver. In the following, I've set the IOClass of the device to IOService which is the superclass for all devices which will not try to open the device. This leaves it available for your user land driver to be able to access the device.

You will need to ensure that the codeless kext gets installed into the /System/Library/Extensions folder and that you touch the Extensions folder so that the kexts will be re-enumerated on restart.

best wishes.
rich kubota

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd";>
<plist version="1.0">
<dict>
<key>CFBundleDevelopmentRegion</key>
<string>English</string>
<key>CFBundleIconFile</key>
<string></string>
<key>CFBundleIdentifier</key>
<string>com.MySoftwareCompany.driver.HIDNoMatchWhtApplKb</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
<key>CFBundlePackageType</key>
<string>KEXT</string>
<key>CFBundleSignature</key>
<string>????</string>
<key>CFBundleVersion</key>
<string>1.0.0d1</string>
<key>IOKitPersonalities</key>
<dict>
<key>White AppleKeyboard</key>
<dict>
<key>CFBundleIdentifier</key>
<string>com.apple.kernel.iokit</string>
<key>IOClass</key>
<string>IOservice</string>
<key>IOProviderClass</key>
<string>IOUSBInterface</string>
<key>bConfigurationValue</key>
<integer>1</integer>
<key>bInterfaceNumber</key>
<integer>1</integer>
<key>bcdDevice</key>
<integer>290</integer>
<key>idProduct</key>
<integer>516</integer>
<key>idVendor</key>
<integer>1452</integer>
</dict>
</dict>
<key>OSBundleLibraries</key>
<dict>
<key>com.apple.iokit.IOUSBFamily</key>
<string>1.8</string>
</dict>
</dict>
</plist>


I am trying to get my Linux application that uses libusb to work under
OSX.  Unfortunatly the USB device it uses is defined as a HID, and
libusb cannot claim it because IOUSBHIDDriver already has.

But, I found one thread that gives hope that I can get IOUSBHIDDriver to
let go of the device:
http://lists.apple.com/archives/usb/2004/Mar/msg00064.html

It suggests using a kext with a higher probe score to keep
IOUSBHIDDriver from grabbing the device.  Today is the first time I have
ever used a Mac for development and kernel extensions seem like a huge
topic.  So if someone can point me in the right direction it would be
greatly appreciated.

Thank You,
Brandon Philips


--
Sincerely,
Rich Kubota
email@hidden
(408) 974-6212
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 >Preventing IOUSBHIDDriver From Claiming a Device (From: Brandon Philips <email@hidden>)



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