Re: [PATCH 7/8] sierra: Support CDMA modems

[=?unknown-8bit?q?Bj=C3=B8rn?= Mork <bjorn@mork.no>]

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Forest Bond <forest@alittletooquiet.net> writes:
> On Tue, Mar 05, 2013 at 10:45:15PM +0100, Bjørn Mork wrote:
>> Forest Bond <forest@alittletooquiet.net> writes:
>> 
>> > Anyway, I notice that one of the ports appears to be QCDM.  It appears that QCDM
>> > support is partially implemented in oFono?  But I don't know QCDM at all.  Can
>> > we use it to do netreg?
>> 
>> What kind of Sierra device is this?  And what vid is it using?
>
> Well, I'm really after a few devices:
>
> * Sierra Wireless USB 598 (Sprint/Telus branded)
> * Sierra Wireless MC5728V (Feeney Wireless Skyus 3G)
>
> The 598 has VID 0025.  I think the Skyus 3G does, too (at least in some
> configurations), but I don't have one in front of me to check.  In any case it
> is a very similar part to the 598.  All I have to test with right now is a Telus
> demo device (with no service :/) as my other parts were returned to their
> respective owners some time ago.
>
>> I ask because I have only seen QCDM ports active on Sierra devices
>> in firmware modes with rmnet/qmi_wwan interfaces.  In which case you
>> should have QMI support.
>
> I couldn't get qmicli to do anything with any of the ports, but test-qcdm (from
> the ModemManager source tree) seems to like talking to the last port.
>
>> > If not, I could probably implement (partial) CnS support at some point.  I'm
>> > just not sure I will have time to do it right away.
>> 
>> And those modes do not have any CnS ports.
>
> These parts definitely have CnS ports.  We've used CnS for an unrelated project
> with all of these devices.
>
> In all, I think the ports are as follows:
>
> 1. AT commands
> 2. CnS
> 3. NMEA 0183 (GPS)
> 4. QCDM
>
> WRT #3, I remember seeing what looked like NMEA a while back using a Sprint
> part.  WRT #4 I've only ever tested the Telus part.
>
> What do you think?

Thanks.  I think you are right.  Learning something new every day.
Until know I thought they had a clear split between "Qualcomm" and
"Sierra" protocols, but these devices obviously do a mix.  Is the NMEA
port Sierra style (enabled using the SetNmea control message) or
Qualcomm style (enabled by writing "$GPS_START" to the port)?


Bjørn