linux-kernel - Re: interface for modems with out of band signalling

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Date:	Fri, 15 Dec 2006 17:19:37 +0100 (MET)
From:	Oliver Neukum <oliver@...kum.name>
To:	Phillip Susi <psusi@....rr.com>
Cc:	Oliver Neukum <oliver@...kum.org>, linux-kernel@...r.kernel.org
Subject: Re: interface for modems with out of band signalling

Am Freitag, 15. Dezember 2006 16:53 schrieb Phillip Susi:
> Oliver Neukum wrote:
> > Hi,
> > 
> > I have got a question about modems which use the AT command set, but
> > don't use in band signalling like true rs232 modems. Would two device nodes
> > per communication channel be a good interface?
> 
> Huh?  What do you mean "don't use in band signaling"?  If you are asking 
> how you issue AT commands to the modem while connected, you have to 
> break to command mode.  IIRC, this involves sending a special break 

No, I am talking about how to support modems which don't have a
command mode. These USB modems don't accept AT commands
through the same channel as data. They take them encapsulated in special
command messages to endpoint 0.
How do I export this capability to user space? I am thinking about having
two device nodes. But there may be a driver setting another precedent.
Therefor I am asking.

	Regards
		Oliver

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