From owner-freebsd-stable Mon Jul 1 18: 5:48 2002 Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3AF8637B401; Mon, 1 Jul 2002 18:05:42 -0700 (PDT) Received: from tao.org.uk (genius.tao.org.uk [212.135.162.51]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5D7A643E13; Mon, 1 Jul 2002 18:05:41 -0700 (PDT) (envelope-from joe@tao.org.uk) Received: by tao.org.uk (Postfix, from userid 100) id 5D28238B; Tue, 2 Jul 2002 02:05:27 +0100 (BST) Date: Tue, 2 Jul 2002 02:05:27 +0100 From: Josef Karthauser To: Nick Sayer Cc: freebsd-hardware@freebsd.org, freebsd-stable@freebsd.org Subject: Re: porting uaudio Message-ID: <20020702010527.GA2701@genius.tao.org.uk> Mail-Followup-To: Josef Karthauser , Nick Sayer , freebsd-hardware@freebsd.org, freebsd-stable@freebsd.org References: <3D20EA59.6040701@kfu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3D20EA59.6040701@kfu.com> User-Agent: Mutt/1.3.99i Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Mon, Jul 01, 2002 at 04:48:41PM -0700, Nick Sayer wrote: > I'm giving some preliminary thought to attempting to port NetBSD's > uaudio to the PCM framework. I *believe* I have a good idea what the > various entry points for CHANNEL_DECLARE() (in PCM) do. I think. Maybe. > > What is less clear to me is the sort of hows and whys of USB device > drivers. My presumption is that the USB side of uaudio.c (from NetBSD) > should be relatively straightforward to port, and that the majority of > the work will be to shoehorn that into the PCM side. I further presume > that when I'm done, I'll have a snd_uaudio.ko module that will have > module dependencies on USB and PCM and that it will just work and stuff. :-) That sounds fair, and exactly what I'd assume too. I've not looked at the code yet, but if you're up for doing the work I'll help out in whatever way I can. I'm not sure whether NetBSD use the same pcm framework that we do. I doubt that they use the same drivers, but the infrastructure might be compatible. It's probably worth dropping Cameron (cg@FreeBSD.org) and seeing what his opinion is. I know he was talking about doing some usb audio work a little while ago, but was waiting for the async pipes to be ported to FreeBSD. (It's possible that there's not enough support in -stable to run uaudio at this time - the USB controller code is a bit behind and I'm not sure whether it has async pipes yet). Joe To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message