diff --git a/include/lapd.h b/include/lapd.h
new file mode 100644
index 0000000..fb980d1
--- /dev/null
+++ b/include/lapd.h
@@ -0,0 +1,46 @@
+#ifndef OPENBSC_LAPD_H
+#define OPENBSC_LAPD_H
+
+#include <stdint.h>
+
+#include <osmocom/core/linuxlist.h>
+
+typedef enum {
+	LAPD_MPH_NONE	= 0,
+
+	LAPD_MPH_ACTIVATE_IND,
+	LAPD_MPH_DEACTIVATE_IND,
+
+	LAPD_DL_DATA_IND,
+	LAPD_DL_UNITDATA_IND,
+
+} lapd_mph_type;
+
+struct lapd_instance {
+	struct llist_head list;		/* list of LAPD instances */
+	int network_side;
+
+	void (*transmit_cb)(uint8_t *data, int len, void *cbdata);
+	void *cbdata;
+
+	struct llist_head tei_list;	/* list of TEI in this LAPD instance */
+};
+
+extern uint8_t *lapd_receive(struct lapd_instance *li, uint8_t *data, unsigned int len,
+			     int *ilen, lapd_mph_type *prim);
+
+extern void lapd_transmit(struct lapd_instance *li, uint8_t tei, uint8_t sapi,
+			  uint8_t *data, unsigned int len);
+
+struct lapd_instance *lapd_instance_alloc(int network_side,
+					  void (*tx_cb)(uint8_t *data, int len,
+							void *cbdata), void *cbdata);
+
+
+/* Start a (user-side) SAP for the specified TEI/SAPI on the LAPD instance */
+int lapd_sap_start(struct lapd_instance *li, uint8_t tei, uint8_t sapi);
+
+/* Stop a (user-side) SAP for the specified TEI/SAPI on the LAPD instance */
+int lapd_sap_stop(struct lapd_instance *li, uint8_t tei, uint8_t sapi);
+
+#endif /* OPENBSC_LAPD_H */