callc.c

是关于linux2.5.1的完全源码

/* $Id: callc.c,v 2.51.6.6 2001/09/23 22:24:46 kai Exp $
 *
 * Author       Karsten Keil
 * Copyright    by Karsten Keil      <[e-mail]>
 * 
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 * For changes and modifications please read
 * ../../../Documentation/isdn/HiSax.cert
 *
 * based on the teles driver from Jan den Ouden
 *
 * Thanks to    Jan den Ouden
 *              Fritz Elfert
 *
 */

#define __NO_VERSION__
#include <linux/module.h>
#include <linux/init.h>
#include "hisax.h"
#include <linux/isdn/capicmd.h>

#ifdef MODULE
#define MOD_USE_COUNT ( GET_USE_COUNT (&__this_module))
#endif	/* MODULE */

const char *lli_revision = "$Revision: 2.51.6.6 $";

extern struct IsdnCard cards[];
extern int nrcards;
extern void HiSax_mod_dec_use_count(struct IsdnCardState *cs);
extern void HiSax_mod_inc_use_count(struct IsdnCardState *cs);

static int init_b_st(struct Channel *chanp, int incoming);
static void release_b_st(struct Channel *chanp);

static struct Fsm callcfsm;
static int chancount;

/* experimental REJECT after ALERTING for CALLBACK to beat the 4s delay */
#define ALERT_REJECT 0

/* Value to delay the sending of the first B-channel paket after CONNECT
 * here is no value given by ITU, but experience shows that 300 ms will
 * work on many networks, if you or your other side is behind local exchanges
 * a greater value may be recommented. If the delay is to short the first paket
 * will be lost and autodetect on many comercial routers goes wrong !
 * You can adjust this value on runtime with
 * hisaxctrl <id> 2 <value>
 * value is in milliseconds
 */
#define DEFAULT_B_DELAY	300

/* Flags for remembering action done in lli */

#define  FLG_START_B	0

/*
 * Find card with given driverId
 */
static inline struct IsdnCardState *
hisax_findcard(int driverid)
{
	int i;

	for (i = 0; i < nrcards; i++)
		if (cards[i].cs)
			if (cards[i].cs->myid == driverid)
				return (cards[i].cs);
	return (struct IsdnCardState *) 0;
}

static void
link_debug(struct Channel *chanp, int direction, char *fmt, ...)
{
	va_list args;
	char tmp[16];

	va_start(args, fmt);
	sprintf(tmp, "Ch%d %s ", chanp->chan,
		direction ? "LL->HL" : "HL->LL");
	VHiSax_putstatus(chanp->cs, tmp, fmt, args);
	va_end(args);
}

enum {
	ST_NULL,		/*  0 inactive */
	ST_OUT_DIAL,		/*  1 outgoing, SETUP send; awaiting confirm */
	ST_IN_WAIT_LL,		/*  2 incoming call received; wait for LL confirm */
	ST_IN_ALERT_SENT,	/*  3 incoming call received; ALERT send */
	ST_IN_WAIT_CONN_ACK,	/*  4 incoming CONNECT send; awaiting CONN_ACK */
	ST_WAIT_BCONN,		/*  5 CONNECT/CONN_ACK received, awaiting b-channel prot. estbl. */
	ST_ACTIVE,		/*  6 active, b channel prot. established */
	ST_WAIT_BRELEASE,	/*  7 call clear. (initiator), awaiting b channel prot. rel. */
	ST_WAIT_BREL_DISC,	/*  8 call clear. (receiver), DISCONNECT req. received */
	ST_WAIT_DCOMMAND,	/*  9 call clear. (receiver), awaiting DCHANNEL message */
	ST_WAIT_DRELEASE,	/* 10 DISCONNECT sent, awaiting RELEASE */
	ST_WAIT_D_REL_CNF,	/* 11 RELEASE sent, awaiting RELEASE confirm */
	ST_IN_PROCEED_SEND,	/* 12 incoming call, proceeding send */ 
};
  

#define STATE_COUNT (ST_IN_PROCEED_SEND + 1)

static char *strState[] =
{
	"ST_NULL",
	"ST_OUT_DIAL",
	"ST_IN_WAIT_LL",
	"ST_IN_ALERT_SENT",
	"ST_IN_WAIT_CONN_ACK",
	"ST_WAIT_BCONN",
	"ST_ACTIVE",
	"ST_WAIT_BRELEASE",
	"ST_WAIT_BREL_DISC",
	"ST_WAIT_DCOMMAND",
	"ST_WAIT_DRELEASE",
	"ST_WAIT_D_REL_CNF",
	"ST_IN_PROCEED_SEND",
};

enum {
	EV_DIAL,		/*  0 */
	EV_SETUP_CNF,		/*  1 */
	EV_ACCEPTB,		/*  2 */
	EV_DISCONNECT_IND,	/*  3 */
	EV_RELEASE, 		/*  4 */
	EV_LEASED,		/*  5 */
	EV_LEASED_REL,		/*  6 */
	EV_SETUP_IND,		/*  7 */
	EV_ACCEPTD,		/*  8 */
	EV_SETUP_CMPL_IND,	/*  9 */
	EV_BC_EST,		/* 10 */
	EV_WRITEBUF,		/* 11 */
	EV_HANGUP,		/* 12 */
	EV_BC_REL,		/* 13 */
	EV_CINF,		/* 14 */
	EV_SUSPEND,		/* 15 */
	EV_RESUME,		/* 16 */
	EV_NOSETUP_RSP,		/* 17 */
	EV_SETUP_ERR,		/* 18 */
	EV_CONNECT_ERR,		/* 19 */
	EV_PROCEED,		/* 20 */
	EV_ALERT,		/* 21 */ 
	EV_REDIR,		/* 22 */ 
};

#define EVENT_COUNT (EV_REDIR + 1)

static char *strEvent[] =
{
	"EV_DIAL",
	"EV_SETUP_CNF",
	"EV_ACCEPTB",
	"EV_DISCONNECT_IND",
	"EV_RELEASE",
	"EV_LEASED",
	"EV_LEASED_REL",
	"EV_SETUP_IND",
	"EV_ACCEPTD",
	"EV_SETUP_CMPL_IND",
	"EV_BC_EST",
	"EV_WRITEBUF",
	"EV_HANGUP",
	"EV_BC_REL",
	"EV_CINF",
	"EV_SUSPEND",
	"EV_RESUME",
	"EV_NOSETUP_RSP",
	"EV_SETUP_ERR",
	"EV_CONNECT_ERR",
	"EV_PROCEED",
	"EV_ALERT",
	"EV_REDIR",
};


static inline void
HL_LL(struct Channel *chanp, int command)
{
	isdn_ctrl ic;

	ic.driver = chanp->cs->myid;
	ic.command = command;
	ic.arg = chanp->chan;
	chanp->cs->iif.statcallb(&ic);
}

static inline void
lli_deliver_cause(struct Channel *chanp)
{
	isdn_ctrl ic;

	if (!chanp->proc)
		return;
	if (chanp->proc->para.cause == NO_CAUSE)
		return;
	ic.driver = chanp->cs->myid;
	ic.command = ISDN_STAT_CAUSE;
	ic.arg = chanp->chan;
	if (chanp->cs->protocol == ISDN_PTYPE_EURO)
		sprintf(ic.parm.num, "E%02X%02X", chanp->proc->para.loc & 0x7f,
			chanp->proc->para.cause & 0x7f);
	else
		sprintf(ic.parm.num, "%02X%02X", chanp->proc->para.loc & 0x7f,
			chanp->proc->para.cause & 0x7f);
	chanp->cs->iif.statcallb(&ic);
}

static inline void
lli_close(struct FsmInst *fi)
{
	struct Channel *chanp = fi->userdata;

	FsmChangeState(fi, ST_NULL);
	chanp->Flags = 0;
	chanp->cs->cardmsg(chanp->cs, MDL_INFO_REL, (void *) (long)chanp->chan);
}

static void
lli_leased_in(struct FsmInst *fi, int event, void *arg)
{
	struct Channel *chanp = fi->userdata;
	isdn_ctrl ic;
	int ret;

	if (!chanp->leased)
		return;
	chanp->cs->cardmsg(chanp->cs, MDL_INFO_SETUP, (void *) (long)chanp->chan);
	FsmChangeState(fi, ST_IN_WAIT_LL);
	if (chanp->debug & 1)
		link_debug(chanp, 0, "STAT_ICALL_LEASED");
	ic.driver = chanp->cs->myid;
	ic.command = ((chanp->chan < 2) ? ISDN_STAT_ICALL : ISDN_STAT_ICALLW);
	ic.arg = chanp->chan;
	ic.parm.setup.si1 = 7;
	ic.parm.setup.si2 = 0;
	ic.parm.setup.plan = 0;
	ic.parm.setup.screen = 0;
	sprintf(ic.parm.setup.eazmsn,"%d", chanp->chan + 1);
	sprintf(ic.parm.setup.phone,"LEASED%d", chanp->cs->myid);
	ret = chanp->cs->iif.statcallb(&ic);
	if (chanp->debug & 1)
		link_debug(chanp, 1, "statcallb ret=%d", ret);
	if (!ret) {
		chanp->cs->cardmsg(chanp->cs, MDL_INFO_REL, (void *) (long)chanp->chan);
		FsmChangeState(fi, ST_NULL);
	}
}

/*
 * Dial out
 */
static void
lli_init_bchan_out(struct FsmInst *fi, int event, void *arg)
{
	struct Channel *chanp = fi->userdata;

	FsmChangeState(fi, ST_WAIT_BCONN);
	if (chanp->debug & 1)
		link_debug(chanp, 0, "STAT_DCONN");
	HL_LL(chanp, ISDN_STAT_DCONN);
	init_b_st(chanp, 0);
	L4L3(chanp->b_st, DL_ESTABLISH | REQUEST, NULL);
}

static void
lli_prep_dialout(struct FsmInst *fi, int event, void *arg)
{
	struct Channel *chanp = fi->userdata;

	FsmDelTimer(&chanp->drel_timer, 60);
	FsmDelTimer(&chanp->dial_timer, 73);
	chanp->l2_active_protocol = chanp->l2_protocol;
	chanp->incoming = 0;
	chanp->cs->cardmsg(chanp->cs, MDL_INFO_SETUP, (void *) (long)chanp->chan);
	if (chanp->leased) {
		lli_init_bchan_out(fi, event, arg);
	} else {
		FsmChangeState(fi, ST_OUT_DIAL);
		L4L3(chanp->d_st, CC_SETUP | REQUEST, chanp);
	}
}

static void
lli_resume(struct FsmInst *fi, int event, void *arg)
{
	struct Channel *chanp = fi->userdata;

	FsmDelTimer(&chanp->drel_timer, 60);
	FsmDelTimer(&chanp->dial_timer, 73);
	chanp->l2_active_protocol = chanp->l2_protocol;
	chanp->incoming = 0;
	chanp->cs->cardmsg(chanp->cs, MDL_INFO_SETUP, (void *) (long)chanp->chan);
	if (chanp->leased) {
		lli_init_bchan_out(fi, event, arg);
	} else {
		FsmChangeState(fi, ST_OUT_DIAL);
		L4L3(chanp->d_st, CC_RESUME | REQUEST, chanp);
	}
}

static void
lli_go_active(struct FsmInst *fi, int event, void *arg)
{
	struct Channel *chanp = fi->userdata;
	isdn_ctrl ic;


	FsmChangeState(fi, ST_ACTIVE);
	chanp->data_open = !0;
	if (chanp->bcs->conmsg)
		strcpy(ic.parm.num, chanp->bcs->conmsg);
	else
		ic.parm.num[0] = 0;
	if (chanp->debug & 1)
		link_debug(chanp, 0, "STAT_BCONN %s", ic.parm.num);
	ic.driver = chanp->cs->myid;
	ic.command = ISDN_STAT_BCONN;
	ic.arg = chanp->chan;
	chanp->cs->iif.statcallb(&ic);
	chanp->cs->cardmsg(chanp->cs, MDL_INFO_CONN, (void *) (long)chanp->chan);
}


/*
 * RESUME
 */

/* incoming call */

static void
lli_deliver_call(struct FsmInst *fi, int event, void *arg)
{
	struct Channel *chanp = fi->userdata;
	isdn_ctrl ic;
	int ret;

	chanp->cs->cardmsg(chanp->cs, MDL_INFO_SETUP, (void *) (long)chanp->chan);
	/*
	 * Report incoming calls only once to linklevel, use CallFlags
	 * which is set to 3 with each broadcast message in isdnl1.c
	 * and resetted if a interface  answered the STAT_ICALL.
	 */
	if (1) { /* for only one TEI */
		FsmChangeState(fi, ST_IN_WAIT_LL);
		if (chanp->debug & 1)
			link_debug(chanp, 0, (chanp->chan < 2) ? "STAT_ICALL" : "STAT_ICALLW");
		ic.driver = chanp->cs->myid;
		ic.command = ((chanp->chan < 2) ? ISDN_STAT_ICALL : ISDN_STAT_ICALLW);

		ic.arg = chanp->chan;
		/*
		 * No need to return "unknown" for calls without OAD,
		 * cause that's handled in linklevel now (replaced by '0')
		 */
		memcpy(&ic.parm.setup, &chanp->proc->para.setup, sizeof(setup_parm));
		ret = chanp->cs->iif.statcallb(&ic);
		if (chanp->debug & 1)
			link_debug(chanp, 1, "statcallb ret=%d", ret);

		switch (ret) {
			case 1:	/* OK, someone likes this call */
				FsmDelTimer(&chanp->drel_timer, 61);
				FsmChangeState(fi, ST_IN_ALERT_SENT);
				L4L3(chanp->d_st, CC_ALERTING | REQUEST, chanp->proc);
				break;
			case 5: /* direct redirect */
			case 4: /* Proceeding desired */
				FsmDelTimer(&chanp->drel_timer, 61);
				FsmChangeState(fi, ST_IN_PROCEED_SEND);
				L4L3(chanp->d_st, CC_PROCEED_SEND | REQUEST, chanp->proc);
				if (ret == 5) {
					memcpy(&chanp->setup, &ic.parm.setup, sizeof(setup_parm));
					L4L3(chanp->d_st, CC_REDIR | REQUEST, chanp->proc);
				}
				break;
			case 2:	/* Rejecting Call */
				break;
			case 3:	/* incomplete number */
				FsmDelTimer(&chanp->drel_timer, 61);
				L4L3(chanp->d_st, CC_MORE_INFO | REQUEST, chanp->proc);
				break;
			case 0:	/* OK, nobody likes this call */
			default:	/* statcallb problems */
				L4L3(chanp->d_st, CC_IGNORE | REQUEST, chanp->proc);
				chanp->cs->cardmsg(chanp->cs, MDL_INFO_REL, (void *) (long)chanp->chan);
				FsmChangeState(fi, ST_NULL);
				break;
		}
	} else {
		L4L3(chanp->d_st, CC_IGNORE | REQUEST, chanp->proc);
		chanp->cs->cardmsg(chanp->cs, MDL_INFO_REL, (void *) (long)chanp->chan);
	}
}

static void
lli_send_dconnect(struct FsmInst *fi, int event, void *arg)
{
	struct Channel *chanp = fi->userdata;

	FsmChangeState(fi, ST_IN_WAIT_CONN_ACK);
	L4L3(chanp->d_st, CC_SETUP | RESPONSE, chanp->proc);
}

static void
lli_send_alert(struct FsmInst *fi, int event, void *arg)
{
	struct Channel *chanp = fi->userdata;

	FsmChangeState(fi, ST_IN_ALERT_SENT);
	L4L3(chanp->d_st, CC_ALERTING | REQUEST, chanp->proc);
}

static void
lli_send_redir(struct FsmInst *fi, int event, void *arg)
{
	struct Channel *chanp = fi->userdata;

	L4L3(chanp->d_st, CC_REDIR | REQUEST, chanp->proc);
}

static void
lli_init_bchan_in(struct FsmInst *fi, int event, void *arg)
{
	struct Channel *chanp = fi->userdata;

	FsmChangeState(fi, ST_WAIT_BCONN);
	if (chanp->debug & 1)
		link_debug(chanp, 0, "STAT_DCONN");
	HL_LL(chanp, ISDN_STAT_DCONN);
	chanp->l2_active_protocol = chanp->l2_protocol;
	chanp->incoming = !0;
	init_b_st(chanp, !0);
	L4L3(chanp->b_st, DL_ESTABLISH | REQUEST, NULL);
}

static void
lli_setup_rsp(struct FsmInst *fi, int event, void *arg)
{
	struct Channel *chanp = fi->userdata;

	if (chanp->leased) {
		lli_init_bchan_in(fi, event, arg);
	} else {
		FsmChangeState(fi, ST_IN_WAIT_CONN_ACK);
#ifdef WANT_ALERT
		L4L3(chanp->d_st, CC_ALERTING | REQUEST, chanp->proc);
#endif
		L4L3(chanp->d_st, CC_SETUP | RESPONSE, chanp->proc);
	}
}

/* Call suspend */