Hi Pekka,

> The online/offline state is changed with the new set_online() modem driver
> method.
> 
> In order to track atoms, there are modem states as follows:
> - OFONO_MODEM_STATE_POWER_OFF
> - OFONO_MODEM_STATE_PRE_SIM
> - OFONO_MODEM_STATE_OFFLINE
> - OFONO_MODEM_STATE_ONLINE
> 
> Atoms are added with driver methods pre_sim(), post_sim() and
>  post_online(). Atoms are removed by modem core when the state changes.

Patch has been applied, however I did some refactoring afterward.  Please test 
that I didn't break something.

Regards,
-Denis