From owner-freebsd-current@FreeBSD.ORG Sat Aug 7 22:01:34 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3AE2216A4CE for ; Sat, 7 Aug 2004 22:01:34 +0000 (GMT) Received: from harmony.village.org (rover.village.org [168.103.84.182]) by mx1.FreeBSD.org (Postfix) with ESMTP id B0CA143D5A for ; Sat, 7 Aug 2004 22:01:33 +0000 (GMT) (envelope-from imp@bsdimp.com) Received: from localhost (warner@rover2.village.org [10.0.0.1]) by harmony.village.org (8.12.11/8.12.11) with ESMTP id i77LweqE038945; Sat, 7 Aug 2004 15:58:40 -0600 (MDT) (envelope-from imp@bsdimp.com) Date: Sat, 07 Aug 2004 15:59:20 -0600 (MDT) Message-Id: <20040807.155920.66760165.imp@bsdimp.com> To: dmp@bitfreak.org From: "M. Warner Losh" In-Reply-To: <000001c47cb8$8ef1bb50$142a15ac@spud> References: <20040806.231231.33567668.imp@bsdimp.com> <000001c47cb8$8ef1bb50$142a15ac@spud> X-Mailer: Mew version 3.3 on Emacs 21.3 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit cc: freebsd-current@freebsd.org cc: chris@tellme3times.com Subject: Re: USB drivers X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 07 Aug 2004 22:01:34 -0000 In message: <000001c47cb8$8ef1bb50$142a15ac@spud> "Darren Pilgrim" writes: : > From: M. Warner Losh : > : > In message: <41124C8B.2060902@tellme3times.com> : > Chris writes: : > : : > : What I am trying to determine is why my multifunction : printer/scanner : > : receives only one of the two drivers. Is it because the printer : does : > : not respond properly? Is it because the printer is not defined? I : > : have many questions here. : > : > Yes. Usb is a little complicated in this area, and there are a number : > of details that are hard to get right. It wouldn't surprise me if the : > current set of drivers are less than completely optimal. : : On a bit of a side-track, I'm wondering if it could be due to how the : multifunction device presents itself? A bit back in this thread someone : mentioned that a pointer must be present for a driver to attach to a : device. If there is only one pointer for a device, only one driver may : attach. Since a single USB bus can have a LOT of devices and each : device's capabilities are determined through the presence of usage : pages, I see two ways for a multifunction device to present itself: : : - A single device ID with more than one usage page. All the : functionality is there and is compatible with FreeBSD drivers, but since : there is only one device probed on the bus, only one driver may attach. : Perhaps a "simple" mux driver would be useful? : : - A multiple single-usage device IDs. Same functionality as before, but : now FreeBSD can probe unique printer and scanner devices and thus let : both ulpt and uscanner attach simutaneously. : : Am I way off base? No. You are exactly on base. That's why I pointed at you at the usb information program. Run it with the device plugged in, and we'll be able to know the details. Warner