FreeBSD USB driver Documents?

[Hans Petter Selasky]

On Tuesday 11 August 2009 16:15:21 vishalu93 wrote:
> I am trying to understand FreeBSD USB driver stack. The code is not
> commented and hence it is difficult/time consuming to understand the code.
> Are there any documents available describing different functions of USB
> driver.

There is /usr/src/tools/kerneldoc/

man 3 usb
man 4 usb
man libusb

Else look at already existing drivers. No books from O'reilly available yet 
:-)

--HPS