export list of e1 drivers and e1 lines

diff --git a/include/openbsc/e1_input.h b/include/openbsc/e1_input.h
index 7804fa4..bf91b49 100644
--- a/include/openbsc/e1_input.h
+++ b/include/openbsc/e1_input.h
@@ -144,5 +144,7 @@
 int ia_config(struct gsm_bts *bts);
 int ipaccess_setup(struct e1inp_line *line);
 
+struct llist_head e1inp_driver_list;
+struct llist_head e1inp_line_list;
 
 #endif /* _E1_INPUT_H */