Re: [PATCH 1/1] telit: stay 'online' until POST_SIM state reached

[Christopher Vogl <christopher.vogl@hale.at>]

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Hi Jonas & Denis,

On 07/12/12 14:58, Denis Kenzior wrote:
> Hi Jonas,
>
> On 12/07/2012 12:22 AM, Jonas Bonn wrote:
>> Hi Denis,
>>
>> On Tue, 2012-12-04 at 23:55 -0600, Denis Kenzior wrote:
>>> Hi Jonas,
>>>
>>> On 12/04/2012 09:46 AM, Jonas Bonn wrote:
>>>> In offline state where CFUN=4, the Telit HE910 also powers down the 
>>>> SIM
>>>> card so AT commands that query the SIM will fail.  These failures 
>>>> result
>>>> in ofono not getting to POST_SIM state where it will export the GPRS
>>>> feature.

I suppose the failing of AT+CMER results in the missing of the GPRS atom.
AT+CMER fails because of the SIM being busy and in consequence the 
network registration atom is removed - see Ming Li Wu's problem (Telit 
HE910: CMER command problem).

I also tried the HE910 and had the same problem. In case a PIN is 
required, the following solves the problem:

In /drivers/atmodem/sim.c, at_qss_notify()
case 2:    /* PIN unlocked */
has to be changed to
case 3:    /* SIM INSERTED and READY */


After the PIN was entered, we wait until the modem states that the SIM 
is ready, i.e. #QSS: 3.


I haven't found a proper way to do this in case there is no PIN required.
We should only get to "post sim state" if we received #QSS: 3


>>
>>>
>>> Does the HE910 have a proper CFUN mode where it does not turn off the
>>> SIM?  You are making some nasty hacks because of it, and the other 
>>> Telit
>>> devices support this just fine.
>>
>> No, the HE910 supports CFUN modes 0,1,4,5,7 where:
>> 1: online
>> 4: offline (airplane) mode with SIM powered off
>> 0,5,7: online w/ power saving modes; SMS and phone calls are active in
>> these modes, but AT command handling seems to be turned off
>>
>> See Telit Modules Software User Guide, 1vv0300784 rev 11, 2012-09-20,
>> section 3.6 (page 105) for a description of these modes.
>>
>
> I read the description of CFUN in that document and got lost rather 
> quickly.  The bottom line is that oFono does not use any serial 
> signaling, so all of these DTR and RTS conditions do not apply.  If 
> the Telit modems do not support radio off with SIM on, then you need 
> to structure the driver differently, most likely removing the 'online' 
> method implementation would do what you want, and use only 
> enable/disable.  In theory that should work putting the modem online 
> as soon as the sim is in the ready state.
>
> Better yet, ask Telit to fix their firmware and document what the 
> <rst> parameter to CFUN actually means.

Is it really unusual for a modem to deactivate the SIM in flight mode? I 
had a look at some mobile phones and they seem to deactivate the SIM in 
flight mode.


Regards,
Christopher

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