include/openbsc/e1_input.h

#ifndef _E1_INPUT_H
#define _E1_INPUT_H

#include <stdlib.h>

#include <openbsc/linuxlist.h>
#include <openbsc/gsm_data.h>
#include <openbsc/msgb.h>
#include <openbsc/select.h>
#include <openbsc/subchan_demux.h>

#define NUM_E1_TS   32

enum e1inp_sign_type {
	E1INP_SIGN_NONE,
	E1INP_SIGN_OML,
	E1INP_SIGN_RSL,
};

struct e1inp_ts;

struct e1inp_sign_link {
	/* list of signalling links */
	struct llist_head list;

	/* to which timeslot do we belong? */
	struct e1inp_ts *ts;

	enum e1inp_sign_type type;

	/* trx for msg->trx of received msgs */	
	struct gsm_bts_trx *trx;

	/* msgb queue of to-be-transmitted msgs */
	struct llist_head tx_list;

	/* SAPI and TEI on the E1 TS */
	u_int8_t sapi;
	u_int8_t tei;

	union {
		struct {
			u_int8_t channel;
		} misdn;
	} driver;
};

enum e1inp_ts_type {
	E1INP_TS_TYPE_NONE,
	E1INP_TS_TYPE_SIGN,
	E1INP_TS_TYPE_TRAU,
};

/* A timeslot in the E1 interface */
struct e1inp_ts {
	enum e1inp_ts_type type;
	int num;

	/* to which line do we belong ? */
	struct e1inp_line *line;

	union {
		struct {
			struct llist_head sign_links;
		} sign;
		struct {
			/* subchannel demuxer for frames from E1 */
			struct subch_demux demux;
			/* subchannel muxer for frames to E1 */
			struct subch_mux mux;
		} trau;
	};
	union {
		struct {
			/* mISDN driver has one fd for each ts */
			struct bsc_fd fd;
		} misdn;
	} driver;
};

struct e1inp_driver {
	struct llist_head list;
	const char *name;
	int (*want_write)(struct e1inp_ts *ts);
};	

struct e1inp_line {
	struct llist_head list;
	unsigned int num;
	const char *name;

	/* array of timestlots */
	struct e1inp_ts ts[NUM_E1_TS];

	struct e1inp_driver *driver;
	void *driver_data;
};

/* register a driver with the E1 core */
int e1inp_driver_register(struct e1inp_driver *drv);

/* register a line with the E1 core */
int e1inp_line_register(struct e1inp_line *line);

/* find a sign_link for given TEI and SAPI in a TS */
struct e1inp_sign_link *
e1inp_lookup_sign_link(struct e1inp_ts *ts, u_int8_t tei,
			u_int8_t sapi);

/* create a new signalling link in a E1 timeslot */
struct e1inp_sign_link *
e1inp_sign_link_create(struct e1inp_ts *ts, enum e1inp_sign_type type,
			struct gsm_bts_trx *trx, u_int8_t tei,
			u_int8_t sapi);

/* configure and initialize one e1inp_ts */
int e1inp_ts_config(struct e1inp_ts *ts, struct e1inp_line *line,
		    enum e1inp_ts_type type);

/* Call from the Stack: configuration of this TS has changed */
int e1inp_update_ts(struct e1inp_ts *ts);

/* Receive a packet from the E1 driver */
int e1inp_rx_ts(struct e1inp_ts *ts, struct msgb *msg,
		u_int8_t tei, u_int8_t sapi);

/* called by driver if it wants to transmit on a given TS */
struct msgb *e1inp_tx_ts(struct e1inp_ts *e1i_ts,
			 struct e1inp_sign_link **sign_link);

/* called by driver in case some kind of link state event */
int e1inp_event(struct e1inp_ts *ts, int evt, u_int8_t tei, u_int8_t sapi);

/* called by TRAU muxer to obtain the destination mux entity */
struct subch_mux *e1inp_get_mux(u_int8_t e1_nr, u_int8_t ts_nr);

#endif /* _E1_INPUT_H */