diff --git a/drivers/atmodem/atutil.c b/drivers/atmodem/atutil.c
index adcca85b..1db524e3 100644
--- a/drivers/atmodem/atutil.c
+++ b/drivers/atmodem/atutil.c
@@ -24,15 +24,17 @@
 #include <config.h>
 #endif
 
-#include <glib.h>
-#include <gatchat.h>
 #include <string.h>
 #include <stdlib.h>
 #include <errno.h>
 
+#include <glib.h>
+#include <gattty.h>
+
 #define OFONO_API_SUBJECT_TO_CHANGE
 #include <ofono/log.h>
 #include <ofono/types.h>
+#include <ofono/modem.h>
 
 #include "atutil.h"
 #include "vendor.h"
@@ -736,3 +738,52 @@ char *at_util_get_cgdcont_command(guint cid, enum ofono_gprs_proto proto,
 	return g_strdup_printf("AT+CGDCONT=%u,\"%s\",\"%s\"", cid, pdp_type,
 									apn);
 }
+
+GAtChat *at_util_open_device(struct ofono_modem *modem, const char *key,
+				GAtDebugFunc debug_func, char *debug_prefix,
+				char *tty_option, ...)
+{
+	const char *device;
+	va_list args;
+	GIOChannel *channel;
+	GAtSyntax *syntax;
+	GAtChat *chat;
+	GHashTable *options = NULL;
+
+	device = ofono_modem_get_string(modem, key);
+	if (device == NULL)
+		return NULL;
+
+	if (tty_option) {
+		options = g_hash_table_new(g_str_hash, g_str_equal);
+		if (options == NULL)
+			return NULL;
+
+		va_start(args, tty_option);
+		while (tty_option) {
+			gpointer value = (gpointer) va_arg(args, const char *);
+
+			g_hash_table_insert(options, tty_option, value);
+			tty_option = (gpointer) va_arg(args, const char *);
+		}
+	}
+
+	channel = g_at_tty_open(device, options);
+	g_hash_table_destroy(options);
+
+	if (channel == NULL)
+		return NULL;
+
+	syntax = g_at_syntax_new_gsm_permissive();
+	chat = g_at_chat_new(channel, syntax);
+	g_at_syntax_unref(syntax);
+	g_io_channel_unref(channel);
+
+	if (chat == NULL)
+		return NULL;
+
+	if (getenv("OFONO_AT_DEBUG"))
+		g_at_chat_set_debug(chat, debug_func, debug_prefix);
+
+	return chat;
+}
diff --git a/drivers/atmodem/atutil.h b/drivers/atmodem/atutil.h
index 61800ff4..fe2acb39 100644
--- a/drivers/atmodem/atutil.h
+++ b/drivers/atmodem/atutil.h
@@ -20,6 +20,10 @@
  *
  */
 
+#include <gatchat.h>
+
+struct ofono_modem;
+
 enum at_util_sms_store {
 	AT_UTIL_SMS_STORE_SM =	0,
 	AT_UTIL_SMS_STORE_ME =	1,
@@ -169,3 +173,7 @@ static inline int at_util_convert_signal_strength(int strength)
 		e.error = 0;				\
 		f(&e, ##args);				\
 	} while (0)
+
+GAtChat *at_util_open_device(struct ofono_modem *modem, const char *key,
+				GAtDebugFunc debug_func, char *debug_prefix,
+				char *tty_option, ...);