Add lapd.c and lapd.h
diff --git a/openbsc/src/input/lapd.h b/openbsc/src/input/lapd.h
new file mode 100644
index 0000000..73195d6
--- /dev/null
+++ b/openbsc/src/input/lapd.h
@@ -0,0 +1,19 @@
+
+#include <stdint.h>
+
+typedef enum {
+ LAPD_MPH_NONE = 0,
+
+ LAPD_MPH_ACTIVATE_IND,
+ LAPD_MPH_DEACTIVATE_IND,
+
+ LAPD_DL_DATA_IND,
+
+} lapd_mph_type;
+
+extern uint8_t *lapd_receive(uint8_t *data, int len, int *ilen, lapd_mph_type *prim, void *cbdata);
+
+extern void (*lapd_transmit_cb)(uint8_t *data, int len, void *cbdata);
+
+extern void lapd_transmit(int tei, uint8_t *data, int len, void *cbdata);
+