From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: multipart/mixed; boundary="===============2273259371959877928==" MIME-Version: 1.0 From: Philippe Nunes Subject: Re: [PATCH v2 6/6] cdmamodem: Add serving system identifier support Date: Thu, 24 Nov 2011 18:35:32 +0100 Message-ID: <4ECE8064.7030803@linux.intel.com> In-Reply-To: <4EC6772B.8020804@gmail.com> List-Id: To: ofono@ofono.org --===============2273259371959877928== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Hi Denis, On 11/18/2011 04:18 PM, Denis Kenzior wrote: > Hi Philippe, > >>> I would also like to see how you're planning to use this information in >>> the core, before reviewing this patch in detail. Do note that after >>> taking a quick peek at Huawei CDMA manuals and ModemManager, I very much >>> doubt that +CSS is what you want to use in the first place. >> >> I'm really not familiar with Huawei CDMA AT commands but looking to the >> command interface specification from Huawei and to TIA/EIA/IS-707, I >> can't see other solution than the serving system query to retrieve the >> SID. Also, I don't see any unsolicited result codes which could bring >> such information. >> >> Note that this AT command seems supported by Huawei cdma modem according >> the first revison of TIA/EIA/IS-707 (here, the band class is not >> supported, neither the PREV field). >> >> Now, it's true that we would need to retrieve also the NID (as stated in >> TODO), but so far, I don't see how... > > I don't really have the answer, but take a peek at ModemManager. +CSS > is not how it retrieves SID in the most common case. In fact it doesn't > even do it via AT commands. If that's the case, then you might want to > rethink this implementation completely. > > Regards, > -Denis > Looking to the modem manager, the priority is indeed to retrieve the SID = using the qcdm port com (thanks to the result of a radio status query). In case of error, there is however a fallback to use the AT command = +CSS. Also, if no qcdm port is available, the SID is retrieved by using = this AT command (please refer to 'legacy_get_serving_system'). Note that in modem manager, there is also a special treatment for Huawei = modem which use the IS-707-A format (no band and class). So far, the AT command "Serving system" seems relevant. Now, do you = expect us to communicate also through the qcdm port when using cdma modem? Regards, Philippe. --===============2273259371959877928==--