Hi Kalle,

Please keep the commit header to less than 50 lines.

> +	device = ofono_modem_get_string(modem, "SecondaryDevice");
> +	if (!device)
> +		return -EINVAL;

Two tabs is enough here.

> +
> +	channel = g_at_tty_open(device, NULL);
> +	if (!channel)
> +		return -EIO;
> +
> +	syntax = g_at_syntax_new_gsm_permissive();
> +	data->event = g_at_chat_new(channel, syntax);
> +	g_at_syntax_unref(syntax);
> +	g_io_channel_unref(channel);
> +
> +	if (!data->event)
> +		return -EIO;
> +
> +	g_at_chat_add_terminator(data->event, "COMMAND NOT SUPPORT", -1,
> +				 FALSE);

Don't mix spaces and tabs for indentation

> +
> +	if (getenv("OFONO_AT_DEBUG"))
> +		g_at_chat_set_debug(data->event, huawei_event_debug, NULL);
> +
> +

Why the extra space?

Also, this entire sequence leaks the data->chat in case the 2nd port could not 
be opened.  See plugins/mbm.c for an example on how to do this better.

Regards,
-Denis