On Friday 24 July 2009 15:01:19 ext Oliver Neukum wrote:

Am Mittwoch, 22. Juli 2009 11:15:34 schrieb Marcel Holtmann:

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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