From owner-freebsd-usb@FreeBSD.ORG  Fri Aug 27 07:02:15 2010
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From: Hans Petter Selasky <hselasky@c2i.net>
To: Jim Bryant <kc5vdj.freebsd@gmail.com>
Date: Fri, 27 Aug 2010 08:58:14 +0200
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Cc: freebsd-usb@freebsd.org
Subject: Re: writing usb drivers under 8.x
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On Thursday 26 August 2010 23:42:46 Jim Bryant wrote:
> does the libusb interface apply to kernel-level drivers, or is it userland?
> 
> Hans Petter Selasky wrote:
> > On Thursday 26 August 2010 22:32:44 Hans Petter Selasky wrote:
> >>> where can i find documentation on this subsystem?
> > 
> > man libusb
> > 
> > --HPS

It is user-space only.

--HPS