USB device tree

• Subject: USB device tree
• From: Rolf <email@hidden>
• Date: Tue, 14 Oct 2003 21:07:45 +0200

Hi,

I need to develop an application that displays the USB device tree. As far as I can see the clue to figuring out the position of each USB device in tree is looking at their location ID's (in hex string format). Through experimentation I think I have figured out how to do that but I 
have a few questions:

1. Can I trust that the format of the location ID's will not change in future versions of OS X ? Is it documented anywhere ?
2. How do I determine with 100% accuracy if a device at a given location ID is a hub or not ? I guess one could search for the word "Hub" in the product string but that seems a bit risky.
3. On my PowerBook G4 DVI I get two "OHCI Root Hub simulation" - one at locationID 0x0000000 and the other at location 0x01000000. Why is this ?

Thanks

/Rolf
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