Hi Rafael,

>  
> -	if (modem_dev == NULL || data_dev == NULL)
> +	if (modem_dev == NULL || data_dev == NULL || gps_dev == NULL)
>  		return -EINVAL;

I don't think that failing because the gps device isn't set is such a
good idea.  There might be mbm cards without a gps node.  Let udev
autodetection handle this part.

>  
>  	data->modem_port = create_port(modem_dev);
> @@ -383,6 +389,20 @@ static int mbm_enable(struct ofono_modem *modem)
>  	if (getenv("OFONO_AT_DEBUG"))
>  		g_at_chat_set_debug(data->data_port, mbm_debug, "Data: ");
>  
> +	data->gps_port = create_port(gps_dev);
> +	if (data->gps_port == NULL) {
> +		g_at_chat_unref(data->data_port);
> +		data->data_port = NULL;
> +
> +		g_at_chat_unref(data->modem_port);
> +		data->modem_port = NULL;
> +
> +		return -EIO;
> +	}

So from what I understand we have to send AT*E2GPSNPD to the GPS port in
order to turn it from a regular AT command port into a GPS port.  At
this point this port is no longer usable for AT commands.  Right?

> +
> +	if (getenv("OFONO_AT_DEBUG"))
> +		g_at_chat_set_debug(data->gps_port, mbm_debug, "GPS: ");
> +
>  	g_at_chat_set_disconnect_function(data->data_port,
>  						mbm_disconnect, modem);
>  
> @@ -415,6 +435,9 @@ static void cfun_disable(gboolean ok, GAtResult *result, gpointer user_data)
>  	g_at_chat_unref(data->data_port);
>  	data->data_port = NULL;
>  
> +	g_at_chat_unref(data->gps_port);
> +	data->gps_port = NULL;
> +
>  	if (ok)
>  		ofono_modem_set_powered(modem, FALSE);
>  }
> @@ -541,6 +564,9 @@ static void mbm_post_online(struct ofono_modem *modem)
>  					OFONO_GPRS_CONTEXT_TYPE_MMS);
>  		ofono_gprs_add_context(data->gprs, data->gc);
>  	}
> +
> +	data->gps = ofono_gps_create(modem, 0,
> +					"mbmmodem", data->gps_port);

If my previous comment is correct, then the gps driver should be running
on the dev port, not on the gps port.

>  }
>  
>  static struct ofono_modem_driver mbm_driver = {

Regards,
-Denis