From owner-freebsd-hackers@FreeBSD.ORG  Tue Sep  6 07:15:24 2011
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 9FA6F106566B
	for <freebsd-hackers@freebsd.org>; Tue,  6 Sep 2011 07:15:24 +0000 (UTC)
	(envelope-from hselasky@c2i.net)
Received: from swip.net (mailfe03.c2i.net [212.247.154.66])
	by mx1.freebsd.org (Postfix) with ESMTP id 23EB68FC12
	for <freebsd-hackers@freebsd.org>; Tue,  6 Sep 2011 07:15:23 +0000 (UTC)
X-Cloudmark-Score: 0.000000 []
X-Cloudmark-Analysis: v=1.1 cv=yVKV3zusvCapyMfYJBNW2j35FMEuTKq6vh/tt/1L5+g=
	c=1 sm=1 a=SvYTsOw2Z4kA:10 a=ze3EKyZnpQUA:10 a=WQU8e4WWZSUA:10
	a=8nJEP1OIZ-IA:10 a=CL8lFSKtTFcA:10
	a=i9M/sDlu2rpZ9XS819oYzg==:17 a=xF7t-OYbmS5wLagobAoA:9
	a=wPNLvfGTeEIA:10 a=i9M/sDlu2rpZ9XS819oYzg==:117
Received: from [188.126.198.129] (account mc467741@c2i.net HELO
	laptop002.hselasky.homeunix.org)
	by mailfe03.swip.net (CommuniGate Pro SMTP 5.2.19)
	with ESMTPA id 7981201; Tue, 06 Sep 2011 09:11:58 +0200
From: Hans Petter Selasky <hselasky@c2i.net>
To: freebsd-hackers@freebsd.org
Date: Tue, 6 Sep 2011 09:09:18 +0200
User-Agent: KMail/1.13.5 (FreeBSD/8.2-STABLE; KDE/4.4.5; amd64; ; )
References: <CAG167sZd4WBSx--ukEb2RXKq0V0-DZJcMYt176bR1Y-snjkFaQ@mail.gmail.com>
	<C44D95B8-2351-4BCD-BC44-071304EFD4FD@gsoft.com.au>
In-Reply-To: <C44D95B8-2351-4BCD-BC44-071304EFD4FD@gsoft.com.au>
X-Face: *nPdTl_}RuAI6^PVpA02T?$%Xa^>@hE0uyUIoiha$pC:9TVgl.Oq, NwSZ4V"|LR.+tj}g5
	%V,x^qOs~mnU3]Gn; cQLv&.N>TrxmSFf+p6(30a/{)KUU!s}w\IhQBj}[g}bj0I3^glmC(
	:AuzV9:.hESm-x4h240C`9=w
MIME-Version: 1.0
Content-Type: Text/Plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Message-Id: <201109060909.18300.hselasky@c2i.net>
Cc: Daniel Grech <dgre090@gmail.com>
Subject: Re: Detach USB Device Driver and Attach it to ugen driver at runtime
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 06 Sep 2011 07:15:24 -0000

On Tuesday 06 September 2011 03:53:55 Daniel O'Connor wrote:
> On 05/09/2011, at 23:10, Daniel Grech wrote:
> > Hi, I'm using libusb to gain access to raw USB Data from userspace. My
> > problem is that this library only works with devices which are treated as
> > generic devices ("handled by the ugen driver"). I need a mechanism that
> > will allow me to detach any device specific drivers that are attached to
> > a device and attach the ugen driver instead. I want to do this without
> > re-compiling the FreeBSD Kernel. Thanks in advance for your help.
> 
> You can access the device via ugen even if a kernel driver has attached to
> it.
> 
> I suspect you wouldn't be able to if the kernel driver that did attach is
> in use, but I am not sure.

You can attach even if a kernel driver is attached, though it is best to only 
have one driver attached at the same time.

--HPS