From owner-freebsd-hackers@FreeBSD.ORG  Sat Jul 10 02:55:51 2004
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from green.homeunix.org (freefall.freebsd.org [216.136.204.21])
	by hub.freebsd.org (Postfix) with ESMTP
	id D2AC416A4CE; Sat, 10 Jul 2004 02:55:50 +0000 (GMT)
Received: from green.homeunix.org (green@localhost [127.0.0.1])
	by green.homeunix.org (8.12.11/8.12.11) with ESMTP id i6A2tnjc014517;
	Fri, 9 Jul 2004 22:55:49 -0400 (EDT)
	(envelope-from green@green.homeunix.org)
Received: (from green@localhost)
	by green.homeunix.org (8.12.11/8.12.11/Submit) id i6A2tfs2014516;
	Fri, 9 Jul 2004 22:55:41 -0400 (EDT)
	(envelope-from green)
Date: Fri, 9 Jul 2004 22:55:41 -0400
From: Brian Fundakowski Feldman <green@freebsd.org>
To: "Aho K.F. Li" <thinker@branda.to>
Message-ID: <20040710025541.GE1626@green.homeunix.org>
References: <E1Bh6Xf-0005UW-02@mailsrv2.tranzpeer.net>
	<40E87B4D.1050203@branda.to>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <40E87B4D.1050203@branda.to>
User-Agent: Mutt/1.5.6i
cc: freebsd-hackers@freebsd.org
cc: idownes@slingshot.co.nz
Subject: Re: where to get info to write basic usb driver for own device?
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
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: Sat, 10 Jul 2004 02:55:51 -0000

On Sun, Jul 04, 2004 at 09:49:01PM +0000, Aho K.F. Li wrote:
> What kind of device do you had build?
> A HID?
> If your device is not with heaven traffic, you can consider to
> develop your driver at user space with ugen(4) or uhid(4) at first.
> And then, move it into kernel space when you need.
> I had wrote a drive for a touch panel device.
> Actually, it is a input device for XFree86.
> I worked it with uhid(4), all my work was finished at user space.
> It would be a good entry point.

I absolutely agree with this -- it's very hard to write good kernel
USB drivers in FreeBSD, and if it can be done with ugen(4)/libusb, you'll
safe yourself a lot of time and pain.

-- 
Brian Fundakowski Feldman                           \'[ FreeBSD ]''''''''''\
  <> green@FreeBSD.org                               \  The Power to Serve! \
 Opinions expressed are my own.                       \,,,,,,,,,,,,,,,,,,,,,,\