Editing Porting/Cellular Modem

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The Cellular Modem architecture on the N900 consists of a daemon, the Cellular Services Daemon that talks to the cellular modem via ISI packets, a daemon, the System Synchronization Controller Daemon that handles cellular modem state, a daemon, the Phonet AT modem daemon that emulates AT commands on top of phonet and configuration utilities to configure phonet interfaces.
The Cellular Modem architecture on the N900 consists of a daemon, the Cellular Services Daemon that talks to the cellular modem via ISI packets, a daemon, the System Synchronization Controller Daemon that handles cellular modem state, a daemon, the Phonet AT modem daemon that emulates AT commands on top of phonet and configuration utilities to configure phonet interfaces.
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== CSD DBus Interfaces ==
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The Cellular Services Daemon exposes the following dbus interfaces:
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* com.nokia.csd.Call (handles phone calls)
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The Cellular Services Daemon exposes the following dbus interfaces
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* com.nokia.csd.Call.Instance (handles a specific instance of a phone call)
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* com.nokia.csd.Call.Conference (handles conference calls)
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{| class="wikitable sortable"
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* com.nokia.csd.GPRS (handles cellular data transfer)
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! Interface !! Handles
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* com.nokia.csd.GPRS.Context (handles a specific cellular data context)
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|-
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* Phone.Net (handles network related things including signal strength, change of cell/operator, change between 2g/3g and network time info change)
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| com.nokia.csd.Call || Phone calls
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* Phone.Sim (handles SIM related things including IMSI, HPLMN and SIM status)
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|-
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* Phone.Sim.Security (handles SIM security related things including IMEI, simlock and SIM PIN)
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| com.nokia.csd.Call.Instance || A specific instance of a phone call
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* Phone.Sim.Phonebook (handles SIM phonebook)
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|-
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* com.nokia.csd.SMS.Outgoing (handles outgoing SMS messages)
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| com.nokia.csd.Call.Conference || Conference calls  
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* com.nokia.csd.SMS.SIM (handles SMS messages stored on the SIM)
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|-
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* Phone.SMS (handles SMS messages including Cell Broadcast SMS messages)
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| com.nokia.csd.GPRS || Cellular data transfer
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* com.nokia.csd.SS (handles Supplementary Services such as call divert call barring and call waiting)
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|-
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* com.nokia.csd.SS.USSD (handles USSD codes)
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| com.nokia.csd.GPRS.Context || A specific cellular data context
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* com.nokia.phone.SSC (handles cellular modem state and status)
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|-
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| Phone.Net || Network related things including:-
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*signal strength
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*change of cell/operator  
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*change between 2g/3g  
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*network time info change  
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|-
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| Phone.Sim || SIM related things including:-
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*IMSI  
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*HPLMN  
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*SIM status  
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|-
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| Phone.Sim.Security || SIM security related things including :-
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*IMEI
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*simlock  
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*SIM PIN  
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|-
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| Phone.Sim.Phonebook || SIM phonebook
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|-
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| com.nokia.csd.SMS.Outgoing || Outgoing SMS messages  
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|-
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| com.nokia.csd.SMS.SIM || SMS messages stored on the SIM  
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|-
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| Phone.SMS || SMS messages including Cell Broadcast SMS messages  
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|-
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| com.nokia.csd.SS || Supplementary Services such as call divert call barring and call waiting  
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|-
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| com.nokia.csd.SS.USSD || USSD codes  
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|-
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| com.nokia.phone.SSC || cellular modem state and status
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|}
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==Proposal==
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The proposal I have for porting the Cellular stack to new hardware (anything with a different cellular modem to the N900) is as follows:-
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The proposal I have for porting the Cellular stack to new hardware (anything with a different cellular modem to the N900) is as follows:
# Reverse engineer the dbus interfaces (as listed above) exposed by the Cellular Services Daemon and System Synchronization Controller Daemon.
# Reverse engineer the dbus interfaces (as listed above) exposed by the Cellular Services Daemon and System Synchronization Controller Daemon.
# For each interface/signal/method call, implement a compatible interface/signal/method call on top of oFono or fsogsmd (or another cellular stack)
# For each interface/signal/method call, implement a compatible interface/signal/method call on top of oFono or fsogsmd (or another cellular stack)

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