diff --git a/libmctp-astlpc.h b/libmctp-astlpc.h
index 4bffd93..81f3b1b 100644
--- a/libmctp-astlpc.h
+++ b/libmctp-astlpc.h
@@ -7,16 +7,36 @@
 extern "C" {
 #endif
 
+#include <unistd.h>
 #include <libmctp.h>
 
 struct mctp_binding_astlpc;
 
-struct mctp_binding_astlpc *mctp_astlpc_init(void);
-int mctp_astlpc_get_fd(struct mctp_binding_astlpc *astlpc);
+enum mctp_binding_astlpc_kcs_reg {
+	MCTP_ASTLPC_KCS_REG_DATA = 0,
+	MCTP_ASTLPC_KCS_REG_STATUS = 1,
+};
+
+struct mctp_binding_astlpc_ops {
+	int	(*kcs_read)(void *data, enum mctp_binding_astlpc_kcs_reg reg,
+			uint8_t *val);
+	int	(*kcs_write)(void *data, enum mctp_binding_astlpc_kcs_reg reg,
+			uint8_t val);
+	int	(*lpc_read)(void *data, void *buf, off_t offset, size_t len);
+	int	(*lpc_write)(void *data, void *buf, off_t offset, size_t len);
+};
+
+struct mctp_binding_astlpc *mctp_astlpc_init_ops(
+		struct mctp_binding_astlpc_ops *ops,
+		void *ops_data, void *lpc_map);
 void mctp_astlpc_register_bus(struct mctp_binding_astlpc *astlpc,
 		struct mctp *mctp, mctp_eid_t eid);
 int mctp_astlpc_poll(struct mctp_binding_astlpc *astlpc);
 
+/* fileio-based interface */
+struct mctp_binding_astlpc *mctp_astlpc_init_fileio(void);
+int mctp_astlpc_get_fd(struct mctp_binding_astlpc *astlpc);
+
 #ifdef __cplusplus
 }
 #endif