LibUSB fails to enumerate all devices

[Loren M. Lang]

I am developing a USB device which has two interfaces, one interface
uses a standard HID protocol, the other is completely custom at the
moment.  FreeBSD attaches appropriately to the HID interface and works
correctly.  For the custom interface, I was going to write a device
driver in userspace using libusb, but I can't seem to find it.  I wrote
a program to enumerate all devices on all busses, but the only device I
see is the one device I don't have any driver loaded for.  Does FreeBSD
not allow a userspace to access an interface of a usb device when any of
it's interfaces are grabbed by a kernel driver even though the interface
I want is not grabbed?
-- 
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Bluescreen leads to downtime.
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