RE: The way to install proper driver for 3G dongle in oFono

>> >> We are facing a problem in oFono when using 3G modems: >> >> >> >> A CDMA2000 modem can have same PID with WCDMA modem, or >TDS-CDMA >> >> modem -- 3G modem vendors already confirm they do that. >> >> >> >> That's to say, if following current strategy, it will be a problem to >> >> install proper driver for this kind of 3G modem. >> >> >> >> So, is it feasible to find out a solution such as to probe the modem >> >> firstly, find out what kind of network modes it supports, and then >> >> install the driver? >> >> >> >> The way to probe the modem could be some action as to read the >> >> capability or get system mode, or issue some specific AT command that >> >> only response to certain network mode? >> >> >> > >> > Indeed, we could use for Huawei modems for instance the AT^SYSINFO >> > command and retrieve the sys_mode field and parse it, I have found >> > this in public Huawei specifications: >> > >> > <sys_mode>: System mode. The values are as follows: >> > 0 No service. >> > 1 AMPS mode >> > 2 CDMA mode >> > 3 GSM/GPRS mode >> > 4 HDR mode >> > 5 WCDMA mode >> > 8 CDMA/HDR HYBRID mode >> > >> > Thus we can chose accordingly the drivers to create oFono atoms. >> >> After some investigations, it seems SYSINFO won't be enough to get the >> modem type because with this AT command we will have to be registered to >> the network to get the system mode. >> The only way I found until now is using the AT+GCAP to check whether the >> modem is CDMA or GSM type. >> However if we do the AT+GCAP request for each constructor plugin >> (huawei, zte, ...) it will bring some duplicated code. >> Does someone see any better solution? > >I like to see that we do proper homework here. The first question is >actually can you execute AT+GCAP if not SIM card has been inserted or is >actually locked? And if not does, ATI provide an extra +GCAP response. >Without a SIM atom you will not be able to unlock the modem. And you can >only create the SIM atom if you know what modem technology you are >using. Additionally of course additionally, what are the responses for >various modem models and manufactures. Are they doing this actually >properly. > >We need OFONO_AT_DEBUG traces for all the various permutations of this >behavior. This needs to be documented first. Feel free to send patches >to add the results to doc/ directory inside oFono. > >Just randomly hacking around will get us in trouble and will make well >behaved modems like MBM or IFX fail or suffer for no apparent reasons. The at+gcap command only effective after SIM card inserted. It is feasible to firstly find the vendor, then choose specific method to detect if it is wcdma/cdma2k, then install proper driver?