Need help in understanding USB driver

[Waitman Gobble]

aseem jolly <aseem.jolly at gmail.com> wrote ..
> I'm new to USB and need help in understanding USB driver.
> Any pointers to usb documentation would be really helpful or a mentor to
> help me come to pace would be the best.
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Hi,

there's three drivers, enhanced (1.0) universal (2.0) and extensible (3.0). 
ehci, ohci, xhci
A great way to see how they work is to take a look at /usr/src/sys/dev/usb/ on your machine. 
But here's a link to the source directory on one of my 10.0-CURRENT machines, https://dx.burplex.com/src/sys/dev/usb/controller/ 
Also I've noticed a book on bn.com about FreeBSD drivers, it *might* be good, it's on my 'to buy and see if it's any good' list. Might check it out.

-- 
Waitman Gobble
San Jose California USA