netdev - Re: [PATCH] USB host CDC Phonet network interface driver

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Message-Id: <200907241514.18871.remi.denis-courmont@nokia.com>
Date:	Fri, 24 Jul 2009 15:14:17 +0300
From:	"Rémi Denis-Courmont" 
	<remi.denis-courmont@...ia.com>
To:	ext Oliver Neukum <oliver@...kum.org>
Cc:	Marcel Holtmann <marcel@...tmann.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	ext Dan Williams <dcbw@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH] USB host CDC Phonet network interface driver

On Friday 24 July 2009 15:01:19 ext Oliver Neukum wrote:
> Am Mittwoch, 22. Juli 2009 11:15:34 schrieb Marcel Holtmann:
> > > > The AT stuff is really problematic. Look at the hoops ISDN and
> > > > software modem drivers go through to emulate AT commands. I know even
> > > > of a CDC-ACM modem which can't deal with AT commands inline (that's
> > > > within spec). It seems to me we should have a modem API in kernel.
> > >
> > > For devices which don't deal in AT commands probably but for devices
> > > whose firmware provides an AT command interface over serial I would
> > > disagree.
> >
> > I fully agree here. Even if you think you get AT commands under control,
> > you really won't in the end. That standard is so wildly mis-interpreted
> > that it is not even funny anymore.
>
> For these devices we could at least separate the data channel from the
> control channel.

"These" as in AT devices? You want a line discipline to multiplex AT commands 
inspite of PPP? I wonder if that'd work.

-- 
Rémi Denis-Courmont
Nokia Devices R&D, Maemo Software, Helsinki

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