GPRS support for Ofono

[Rémi Denis-Courmont]

On Sat, 05 Dec 2009 17:37:36 +0100, Marcel Holtmann <marcel at holtmann.org>
wrote:
> since we have the upstream GPRS support for MBM and HSO devices, it
> would be great to have this for Phonet, too. I tried to work on the
> patch, but without proper documentation it is impossible. So please
> adapt it to the current upstream and resend it.

I can't quite implement the current API for ISI modem. For a start, ofono
is currently crashing in setpowered as soon as it sees an ISI modem.

But there are some more fundamental issues. First, the ISI General Packet
Data Service does not provide any location informations (roaming/not
roaming, area code, cell ID). And I must say I don't understand why this is
part of the GPRS atom. This has nothing to do with packet data.

Second, I couldn't figure how to handle auto-attach. The ISI protocol
supports it, but I could not find the driver callback. Thus, I would have
to force the device into manual mode. This is going to be an issue as some
operators require auto-attach
Also, it prevents optimizing context activation when detached, i.e. "follow
on" GPRS attach, which the ISI modem provides.

I haven't had time to look at the context stuff yet.

-- 
Rémi Denis-Courmont
http://www.remlab.net
http://fi.linkedin.com/in/remidenis