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HID device driver help

I have been reading the USB mailing archives, and as much documentation as I can - it seems circular at times though!!

I have succeeded in being notified of my device being added and removed. I have followed the sample codes and attempted to communicate with my USB device. I believe I am going to have to use the HID manager, as Apple's HID manager opens the device as soon as I plug it in. I have tried to create a Vendor Specific codeless KEXT with little success at the moment. In the system log file it tells me that "someone already has it open" - I think this means my matching values are not quite correct.

I have Windows source which shows how to communicate with this device, and am struggling to work out how to translate this to mach speak.

I need to figure out how to translate this kernel call in Windows:

DeviceIoControl(m_hDevice,
IOCTL_HID_SET_FEATURE, pData, nBytes, NULL, 0, &nBytesTransferred, overlap)

What is the Mac equivalent? m_hDevice is a "file handle" created by calling CreateFile which I noticed someone else enquiring about also.

Sorry for the newb question. I feel like the answer is on the tip of my keyboard.

Thanks for any help!!

gregg
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