Re: [PATCH] doc: Add modem Type property

[Lei Yu <lei.2.yu@nokia.com>]

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Hi Denis,

On 01/21/2011 12:15 PM, ext Denis Kenzior wrote:
> Hi Dara,
>
> On 01/20/2011 04:48 PM, Dara Spieker-Doyle wrote:
>> Add support for providing the type of the attached modem device
>> including GSM (3GPP), CDMA (3GPP2) and Bluetooth HFP.
>> ---
>>   doc/modem-api.txt |   13 +++++++++++++
>>   1 files changed, 13 insertions(+), 0 deletions(-)
>>
>> diff --git a/doc/modem-api.txt b/doc/modem-api.txt
>> index 45043b0..fe806c8 100644
>> --- a/doc/modem-api.txt
>> +++ b/doc/modem-api.txt
>> @@ -82,6 +82,19 @@ Properties	boolean Powered [readwrite]
>>
>>   			This is usually obtained by using the +CGSN AT command.
>>
>> +		string Type [readonly, optional, experimental]
>> +
>> +			String representing the type of the modem device.
>> +
>> +			The possible values are:
>> +				"gsm" 	Modem supports one or more of the 3GPP
>> +					family of technologies including GSM,
>> +					EDGE, UMTS, HSPA, LTE.
>> +				"cdma"  Modem supports one or more of the 3GPP2
>> +					family of technologies including CDMA 1x,
>> +					EVDO.
>> +				"hfp"	Bluetooth hands-free profile (HFP) modem
>> +
>
> So one pointed question:
>
> How are we planning to support dual-mode devices with this property?  I
> believe during the CDMA workshop we decided that the clients should
> simply look at the set of interfaces, not a semi-static property...

We understand that the decision during the CDMA workshop but as we 
explained one use case in the cover letter 
(http://lists.ofono.org/pipermail/ofono/2011-January/007890.html) for 
this RFC, there will be cases where atom's D-Bus I/F is not suitable (or 
as a reliable way) for telling what is current mode (CDMA or GSM). E.g., 
in the case of retrieving serial number from modem. Currently both CDMA 
and GSM shares the same I/F (ofono.org.modem) rather than having 
separate (ofono.org.cdma.modem). And, further if no other atom has been 
instantiated, then, there will be no other way to tell which mode (CDMA 
or GSM) the modem is. And, further for displaying serial number, upper 
layer will need to know it is CDMA or GSM. In case of CDMA, the serial 
number is MEID and GSM it is IMEI. As explained in cover letter, we 
anticipate more cases like this.

>
> Regards,
> -Denis
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Regards
Lei