I'm wondering about what each component of a USB instance ID means.
I see that when a device has a USB serial number, the instance ID is just the serial number.
But, say I have a composite device with three interfaces. I get this:
6&390b9358&2&0005 (for interface 5)
Here's what I think I know so far:
5/6 -- appears to be the number of steps up to the root of the device tree.
1d4952dc/390b9358 -- I have no idea. I believe Maxim described this as "some junk" in a post. I don't know if the parent and child instance IDs are related or not.
0/2 -- don't know.
2/5 -- in the former case, don't know. In the latter case, appears to be the interface number.
Thanks for any information.