1 files changed, 100 insertions, 0 deletions
diff --git a/src/host/layer23/include/osmocom/bb/common/lapdm.h b/src/host/layer23/include/osmocom/bb/common/lapdm.h
new file mode 100644
index 00000000..ab048b8a
--- /dev/null
+++ b/src/host/layer23/include/osmocom/bb/common/lapdm.h
@@ -0,0 +1,100 @@
+#ifndef _OSMOCOM_LAPDM_H
+#define _OSMOCOM_LAPDM_H
+
+#include <stdint.h>
+
+#include <osmocore/timer.h>
+#include <osmocore/msgb.h>
+
+#include <l1a_l23_interface.h>
+
+enum lapdm_state {
+	LAPDm_STATE_NULL = 0,
+	LAPDm_STATE_IDLE,
+	LAPDm_STATE_SABM_SENT,
+	LAPDm_STATE_MF_EST,
+	LAPDm_STATE_TIMER_RECOV,
+	LAPDm_STATE_DISC_SENT,
+};
+
+struct lapdm_entity;
+struct osmocom_ms;
+
+struct lapdm_msg_ctx {
+	struct lapdm_datalink *dl;
+	int lapdm_fmt;
+	uint8_t n201;
+	uint8_t chan_nr;
+	uint8_t link_id;
+	uint8_t addr;
+	uint8_t ctrl;
+	uint8_t ta_ind;
+	uint8_t tx_power_ind;
+};
+
+/* TS 04.06 / Section 3.5.2 */
+struct lapdm_datalink {
+	uint8_t V_send;	/* seq nr of next I frame to be transmitted */
+	uint8_t V_ack;	/* last frame ACKed by peer */
+	uint8_t N_send;	/* ? set to V_send at Tx time*/
+	uint8_t V_recv;	/* seq nr of next I frame expected to be received */
+	uint8_t N_recv;	/* expected send seq nr of the next received I frame */
+	uint32_t state;
+	int seq_err_cond; /* condition of sequence error */
+	uint8_t own_busy, peer_busy;
+	struct timer_list t200;
+	uint8_t retrans_ctr;
+	struct llist_head send_queue; /* frames from L3 */
+	struct msgb *send_buffer; /* current frame transmitting */
+	int send_out; /* how much was sent from send_buffer */
+	uint8_t tx_hist[8][200]; /* tx history buffer */
+	int tx_length[8]; /* length in history buffer */
+	struct llist_head tx_queue; /* frames to L1 */
+	struct lapdm_msg_ctx mctx; /* context of established connection */
+	struct msgb *rcv_buffer; /* buffer to assemble the received message */
+
+	struct lapdm_entity *entity;
+};
+
+enum lapdm_dl_sapi {
+	DL_SAPI0	= 0,
+	DL_SAPI3	= 1,
+	_NR_DL_SAPI
+};
+
+struct lapdm_entity {
+	struct lapdm_datalink datalink[_NR_DL_SAPI];
+	int last_tx_dequeue; /* last entity that was dequeued */
+	int tx_pending; /* currently a pending frame not confirmed by L1 */
+	struct osmocom_ms *ms;
+};
+
+const char *get_rsl_name(int value);
+extern const char *lapdm_state_names[];
+
+/* initialize a LAPDm entity */
+void lapdm_init(struct lapdm_entity *le, struct osmocom_ms *ms);
+
+/* deinitialize a LAPDm entity */
+void lapdm_exit(struct lapdm_entity *le);
+
+/* input into layer2 (from layer 1) */
+int l2_ph_data_ind(struct msgb *msg, struct lapdm_entity *le, struct l1ctl_info_dl *l1i);
+int l2_ph_data_conf(struct msgb *msg, struct lapdm_entity *le);
+
+/* L1 confirms channel request */
+int l2_ph_chan_conf(struct msgb *msg, struct osmocom_ms *ms,
+			struct l1ctl_info_dl *dl);
+
+/* input into layer2 (from layer 3) */
+int rslms_recvmsg(struct msgb *msg, struct osmocom_ms *ms);
+
+/* sending messages up from L2 to L3 */
+int rslms_sendmsg(struct msgb *msg, struct osmocom_ms *ms);
+
+typedef int (*osmol2_cb_t)(struct msgb *msg, struct osmocom_ms *ms);
+
+/* register message handler for messages that are sent from L2->L3 */
+int osmol2_register_handler(struct osmocom_ms *ms, osmol2_cb_t cb);
+
+#endif /* _OSMOCOM_LAPDM_H */