isdn_tty.c

讲述linux的初始化过程

	f->scantime = 0;
	memset(&f->id[0], 32, FAXIDLEN - 1);
	f->id[FAXIDLEN - 1] = 0;
	f->badlin = 0;
	f->badmul = 0;
	f->bor = 0;
	f->nbc = 0;
	f->cq = 0;
	f->cr = 0;
	f->ctcrty = 0;
	f->minsp = 0;
	f->phcto = 30;
	f->rel = 0;
	memset(&f->pollid[0], 32, FAXIDLEN - 1);
	f->pollid[FAXIDLEN - 1] = 0;
}
#endif

static void
isdn_tty_modem_reset_regs(modem_info * info, int force)
{
	atemu *m = &info->emu;
	if ((m->mdmreg[REG_DTRR] & BIT_DTRR) || force) {
		memcpy(m->mdmreg, m->profile, ISDN_MODEM_NUMREG);
		memcpy(m->msn, m->pmsn, ISDN_MSNLEN);
		memcpy(m->lmsn, m->plmsn, ISDN_LMSNLEN);
		info->xmit_size = m->mdmreg[REG_PSIZE] * 16;
	}
#ifdef CONFIG_ISDN_AUDIO
	isdn_tty_modem_reset_vpar(m);
#endif
#ifdef CONFIG_ISDN_TTY_FAX
	isdn_tty_modem_reset_faxpar(info);
#endif
	m->mdmcmdl = 0;
}

static void
modem_write_profile(atemu * m)
{
	memcpy(m->profile, m->mdmreg, ISDN_MODEM_NUMREG);
	memcpy(m->pmsn, m->msn, ISDN_MSNLEN);
	memcpy(m->plmsn, m->lmsn, ISDN_LMSNLEN);
	if (dev->profd)
		send_sig(SIGIO, dev->profd, 1);
}

int
isdn_tty_modem_init(void)
{
	modem *m;
	int i;
	modem_info *info;

	m = &dev->mdm;
	memset(&m->tty_modem, 0, sizeof(struct tty_driver));
	m->tty_modem.magic = TTY_DRIVER_MAGIC;
	m->tty_modem.name = isdn_ttyname_ttyI;
	m->tty_modem.major = ISDN_TTY_MAJOR;
	m->tty_modem.minor_start = 0;
	m->tty_modem.num = ISDN_MAX_CHANNELS;
	m->tty_modem.type = TTY_DRIVER_TYPE_SERIAL;
	m->tty_modem.subtype = ISDN_SERIAL_TYPE_NORMAL;
	m->tty_modem.init_termios = tty_std_termios;
	m->tty_modem.init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
	m->tty_modem.flags = TTY_DRIVER_REAL_RAW;
	m->tty_modem.refcount = &m->refcount;
	m->tty_modem.table = m->modem_table;
	m->tty_modem.termios = m->modem_termios;
	m->tty_modem.termios_locked = m->modem_termios_locked;
	m->tty_modem.open = isdn_tty_open;
	m->tty_modem.close = isdn_tty_close;
	m->tty_modem.write = isdn_tty_write;
	m->tty_modem.put_char = NULL;
	m->tty_modem.flush_chars = isdn_tty_flush_chars;
	m->tty_modem.write_room = isdn_tty_write_room;
	m->tty_modem.chars_in_buffer = isdn_tty_chars_in_buffer;
	m->tty_modem.flush_buffer = isdn_tty_flush_buffer;
	m->tty_modem.ioctl = isdn_tty_ioctl;
	m->tty_modem.throttle = isdn_tty_throttle;
	m->tty_modem.unthrottle = isdn_tty_unthrottle;
	m->tty_modem.set_termios = isdn_tty_set_termios;
	m->tty_modem.stop = NULL;
	m->tty_modem.start = NULL;
	m->tty_modem.hangup = isdn_tty_hangup;
	m->tty_modem.driver_name = "isdn_tty";
	/*
	 * The callout device is just like normal device except for
	 * major number and the subtype code.
	 */
	m->cua_modem = m->tty_modem;
	m->cua_modem.name = isdn_ttyname_cui;
	m->cua_modem.major = ISDN_TTYAUX_MAJOR;
	m->tty_modem.minor_start = 0;
	m->cua_modem.subtype = ISDN_SERIAL_TYPE_CALLOUT;

	if (tty_register_driver(&m->tty_modem)) {
		printk(KERN_WARNING "isdn_tty: Couldn't register modem-device\n");
		return -1;
	}
	if (tty_register_driver(&m->cua_modem)) {
		printk(KERN_WARNING "isdn_tty: Couldn't register modem-callout-device\n");
		return -2;
	}
	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
		info = &m->info[i];
#ifdef CONFIG_ISDN_TTY_FAX
		if (!(info->fax = kmalloc(sizeof(T30_s), GFP_KERNEL))) {
			printk(KERN_ERR "Could not allocate fax t30-buffer\n");
			return -3;
		}
#endif
		init_MUTEX(&info->write_sem);
		sprintf(info->last_cause, "0000");
		sprintf(info->last_num, "none");
		info->last_dir = 0;
		info->last_lhup = 1;
		info->last_l2 = -1;
		info->last_si = 0;
		isdn_tty_reset_profile(&info->emu);
		isdn_tty_modem_reset_regs(info, 1);
		info->magic = ISDN_ASYNC_MAGIC;
		info->line = i;
		info->tty = 0;
		info->x_char = 0;
		info->count = 0;
		info->blocked_open = 0;
		info->callout_termios = m->cua_modem.init_termios;
		info->normal_termios = m->tty_modem.init_termios;
		init_waitqueue_head(&info->open_wait);
		init_waitqueue_head(&info->close_wait);
		info->isdn_driver = -1;
		info->isdn_channel = -1;
		info->drv_index = -1;
		info->xmit_size = ISDN_SERIAL_XMIT_SIZE;
		skb_queue_head_init(&info->xmit_queue);
#ifdef CONFIG_ISDN_AUDIO
		skb_queue_head_init(&info->dtmf_queue);
#endif
		if (!(info->xmit_buf = kmalloc(ISDN_SERIAL_XMIT_MAX + 5, GFP_KERNEL))) {
			printk(KERN_ERR "Could not allocate modem xmit-buffer\n");
			return -3;
		}
		/* Make room for T.70 header */
		info->xmit_buf += 4;
	}
	return 0;
}


/*
 * isdn_tty_match_icall(char *MSN, atemu *tty_emulator, int dev_idx)
 *      match the MSN against the MSNs (glob patterns) defined for tty_emulator,
 *      and return 0 for match, 1 for no match, 2 if MSN could match if longer.
 */

static int
isdn_tty_match_icall(char *cid, atemu *emu, int di)
{
#ifdef ISDN_DEBUG_MODEM_ICALL
	printk(KERN_DEBUG "m_fi: msn=%s lmsn=%s mmsn=%s mreg[SI1]=%d mreg[SI2]=%d\n",
	       emu->msn, emu->lmsn, isdn_map_eaz2msn(emu->msn, di),
	       emu->mdmreg[REG_SI1], emu->mdmreg[REG_SI2]);
#endif
	if (strlen(emu->lmsn)) {
		char *p = emu->lmsn;
		char *q;
		int  tmp;
		int  ret = 0;

		while (1) {
			if ((q = strchr(p, ';')))
				*q = '\0';
			if ((tmp = isdn_msncmp(cid, isdn_map_eaz2msn(p, di))) > ret)
				ret = tmp;
#ifdef ISDN_DEBUG_MODEM_ICALL
			printk(KERN_DEBUG "m_fi: lmsnX=%s mmsn=%s -> tmp=%d\n",
			       p, isdn_map_eaz2msn(emu->msn, di), tmp);
#endif
			if (q) {
				*q = ';';
				p = q;
				p++;
			}
			if (!tmp)
				return 0;
			if (!q)
				break;
		}
		return ret;
	} else {
		int tmp;
		tmp = isdn_msncmp(cid, isdn_map_eaz2msn(emu->msn, di));
#ifdef ISDN_DEBUG_MODEM_ICALL
			printk(KERN_DEBUG "m_fi: mmsn=%s -> tmp=%d\n",
			       isdn_map_eaz2msn(emu->msn, di), tmp);
#endif
		return tmp;
	}
}

/*
 * An incoming call-request has arrived.
 * Search the tty-devices for an appropriate device and bind
 * it to the ISDN-Channel.
 * Return:
 *
 *  0 = No matching device found.
 *  1 = A matching device found.
 *  3 = No match found, but eventually would match, if
 *      CID is longer.
 */
int
isdn_tty_find_icall(int di, int ch, setup_parm *setup)
{
	char *eaz;
	int i;
	int wret;
	int idx;
	int si1;
	int si2;
	char *nr;
	ulong flags;

	if (!setup->phone[0]) {
		nr = "0";
		printk(KERN_INFO "isdn_tty: Incoming call without OAD, assuming '0'\n");
	} else
		nr = setup->phone;
	si1 = (int) setup->si1;
	si2 = (int) setup->si2;
	if (!setup->eazmsn[0]) {
		printk(KERN_WARNING "isdn_tty: Incoming call without CPN, assuming '0'\n");
		eaz = "0";
	} else
		eaz = setup->eazmsn;
#ifdef ISDN_DEBUG_MODEM_ICALL
	printk(KERN_DEBUG "m_fi: eaz=%s si1=%d si2=%d\n", eaz, si1, si2);
#endif
	wret = 0;
	save_flags(flags);
	cli();
	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
		modem_info *info = &dev->mdm.info[i];

                if (info->count == 0)
                    continue;
		if ((info->emu.mdmreg[REG_SI1] & si2bit[si1]) &&  /* SI1 is matching */
		    (info->emu.mdmreg[REG_SI2] == si2))	{         /* SI2 is matching */
			idx = isdn_dc2minor(di, ch);
#ifdef ISDN_DEBUG_MODEM_ICALL
			printk(KERN_DEBUG "m_fi: match1 wret=%d\n", wret);
			printk(KERN_DEBUG "m_fi: idx=%d flags=%08lx drv=%d ch=%d usg=%d\n", idx,
			       info->flags, info->isdn_driver, info->isdn_channel,
			       dev->usage[idx]);
#endif
			if (
#ifndef FIX_FILE_TRANSFER
				(info->flags & ISDN_ASYNC_NORMAL_ACTIVE) &&
#endif
				(info->isdn_driver == -1) &&
				(info->isdn_channel == -1) &&
				(USG_NONE(dev->usage[idx]))) {
				int matchret;

				if ((matchret = isdn_tty_match_icall(eaz, &info->emu, di)) > wret)
					wret = matchret;
				if (!matchret) {                  /* EAZ is matching */
					info->isdn_driver = di;
					info->isdn_channel = ch;
					info->drv_index = idx;
					dev->m_idx[idx] = info->line;
					dev->usage[idx] &= ISDN_USAGE_EXCLUSIVE;
					dev->usage[idx] |= isdn_calc_usage(si1, info->emu.mdmreg[REG_L2PROT]); 
					strcpy(dev->num[idx], nr);
					strcpy(info->emu.cpn, eaz);
					info->emu.mdmreg[REG_SI1I] = si2bit[si1];
					info->emu.mdmreg[REG_PLAN] = setup->plan;
					info->emu.mdmreg[REG_SCREEN] = setup->screen;
					isdn_info_update();
					restore_flags(flags);
					printk(KERN_INFO "isdn_tty: call from %s, -> RING on ttyI%d\n", nr,
					       info->line);
					info->msr |= UART_MSR_RI;
					isdn_tty_modem_result(RESULT_RING, info);
					isdn_timer_ctrl(ISDN_TIMER_MODEMRING, 1);
					return 1;
				}
			}
		}
	}
	restore_flags(flags);
	printk(KERN_INFO "isdn_tty: call from %s -> %s %s\n", nr, eaz,
	       ((dev->drv[di]->flags & DRV_FLAG_REJBUS) && (wret != 2))? "rejected" : "ignored");
	return (wret == 2)?3:0;
}

#define TTY_IS_ACTIVE(info) \
	(info->flags & (ISDN_ASYNC_NORMAL_ACTIVE | ISDN_ASYNC_CALLOUT_ACTIVE))

int
isdn_tty_stat_callback(int i, isdn_ctrl *c)
{
	int mi;
	modem_info *info;
	char *e;

	if (i < 0)
		return 0;
	if ((mi = dev->m_idx[i]) >= 0) {
		info = &dev->mdm.info[mi];
		switch (c->command) {
                        case ISDN_STAT_CINF:
                                printk(KERN_DEBUG "CHARGEINFO on ttyI%d: %ld %s\n", info->line, c->arg, c->parm.num);
                                info->emu.charge = (unsigned) simple_strtoul(c->parm.num, &e, 10);
                                if (e == (char *)c->parm.num)
					info->emu.charge = 0;
				
                                break;			
			case ISDN_STAT_BSENT:
#ifdef ISDN_TTY_STAT_DEBUG
				printk(KERN_DEBUG "tty_STAT_BSENT ttyI%d\n", info->line);
#endif
				if ((info->isdn_driver == c->driver) &&
				    (info->isdn_channel == c->arg)) {
					info->msr |= UART_MSR_CTS;
					if (info->send_outstanding)
						if (!(--info->send_outstanding))
							info->lsr |= UART_LSR_TEMT;
					isdn_tty_tint(info);
					return 1;
				}
				break;
			case ISDN_STAT_CAUSE:
#ifdef ISDN_TTY_STAT_DEBUG
				printk(KERN_DEBUG "tty_STAT_CAUSE ttyI%d\n", info->line);
#endif
				/* Signal cause to tty-device */
				strncpy(info->last_cause, c->parm.num, 5);
				return 1;
			case ISDN_STAT_DISPLAY:
#ifdef ISDN_TTY_STAT_DEBUG
				printk(KERN_DEBUG "tty_STAT_DISPLAY ttyI%d\n", info->line);
#endif
				/* Signal display to tty-device */
				if ((info->emu.mdmreg[REG_DISPLAY] & BIT_DISPLAY) && 
					!(info->emu.mdmreg[REG_RESPNUM] & BIT_RESPNUM)) {
				  isdn_tty_at_cout("\r\n", info);
				  isdn_tty_at_cout("DISPLAY: ", info);
				  isdn_tty_at_cout(c->parm.display, info);
				  isdn_tty_at_cout("\r\n", info);
				}
				return 1;
			case ISDN_STAT_DCONN:
#ifdef ISDN_TTY_STAT_DEBUG
				printk(KERN_DEBUG "tty_STAT_DCONN ttyI%d\n", info->line);
#endif
				if (TTY_IS_ACTIVE(info)) {
					if (info->dialing == 1) {
						info->dialing = 2;
						return 1;
					}
				}
				break;
			case ISDN_STAT_DHUP:
#ifdef ISDN_TTY_STAT_DEBUG
				printk(KERN_DEBUG "tty_STAT_DHUP ttyI%d\n", info->line);
#endif
				if (TTY_IS_ACTIVE(info)) {
					if (info->dialing == 1) 
						isdn_tty_modem_result(RESULT_BUSY, info);
					if (info->dialing > 1) 
						isdn_tty_modem_result(RESULT_NO_CARRIER, info);
					info->dialing = 0;
#ifdef ISDN_DEBUG_MODEM_HUP
					printk(KERN_DEBUG "Mhup in ISDN_STAT_DHUP\n");
#endif
					isdn_tty_modem_hup(info, 0);
					return 1;
				}
				break;
			case ISDN_STAT_BCONN:
#ifdef ISDN_TTY_STAT_DEBUG
				printk(KERN_DEBUG "tty_STAT_BCONN ttyI%d\n", info->line);
#endif
				/* Wake up any processes waiting
				 * for incoming call of this device when
				 * DCD follow the state of incoming carrier
				 */
				if (info->blocked_open &&
				   (info->emu.mdmreg[REG_DCD] & BIT_DCD)) {
					wake_up_interruptible(&info->open_wait);
				}

				/* Schedule CONNECT-Message to any tty
				 * waiting for it and
				 * set DCD-bit of its modem-status.
				 */
				if (TTY_IS_ACTIVE(info) ||
				    (info->blocked_open && (info->emu.mdmreg[REG_DCD] & BIT_DCD))) {
					info->msr |= UART_MSR_DCD;
					info->emu.charge = 0;
					if (info->dialing & 0xf)
						info->last_dir = 1;
					else
						info->last_dir = 0;
					info->dialing = 0;
					info->rcvsched = 1;
					if (USG_MODEM(dev->usage[i])) {
						if (info->emu.mdmreg[REG_L2PROT] == ISDN_PROTO_L2_MODEM) {
							strcpy(info->emu.connmsg, c->parm.num);
							isdn_tty_modem_result(RESULT_CONNECT, info);
						} else
							isdn_tty_modem_result(RESULT_CONNECT64000, info);
					}
					if (USG_VOICE(dev->usage[i]))
						isdn_tty_modem_result(RESULT_VCON, info);
					return 1;
				}
				break;
			case ISDN_STAT_BHUP:
#ifdef ISDN_TTY_STAT_DEBUG
				printk(KERN_DEBUG "tty_STAT_BHUP ttyI%d\n", info->line);
#endif
				if (TTY_IS_ACTIVE(info)) {
#ifdef ISDN_DEBUG_MODEM_HUP
					printk(KERN_DEBUG "Mhup in ISDN_STAT_BHUP\n");
#endif
					isdn_tty_modem_hup(info, 0);
					return 1;
				}
				break;
			case ISDN_STAT_NODCH:
#ifdef ISDN_TTY_STAT_DEBUG
				printk(KERN_DEBUG "tty_STAT_NODCH ttyI%d\n", info->line);
#endif
				if (TTY_IS_ACTIVE(info)) {
					if (info->dialing) {
						info->dialing = 0;
						info->last_l2 = -1;
						info->last_si = 0;
						sprintf(info->last_cause, "0000");
						isdn_tty_modem_result(RESULT_NO_DIALTONE, info);
					}
					isdn_tty_modem_hup(info, 0);
					return 1;
				}
				break;
			case ISDN_STAT_UNLOAD:
#ifdef ISDN_TTY_STAT_DEBUG
				printk(KERN_DEBUG "tty_STAT_UNLOAD ttyI%d\n", info->line);
#endif
				for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
					info = &dev->mdm.info[i];
					if (info->isdn_driver == c->driver) {
						if (info->online)
							isdn_tty_modem_hup(info, 1);
					}
				}
				return 1;
#ifdef CONFIG_ISDN_TTY_FAX
			case ISDN_STAT_FAXIND:
				if (TTY_IS_ACTIVE(info)) {
					isdn_tty_fax_command(info, c); 
				}
				break;
#endif
#ifdef CONFIG_ISDN_AUDIO
			case ISDN_STAT_AUDIO:
				if (TTY_IS_ACTIVE(info)) {
					switch(c->parm.num[0]) {
						case ISDN_AUDIO_DTMF:
							if (info->vonline) {
								isdn_audio_put_dle_code(info,
									c->parm.num[1]);
							}
							break;
					}
				}
				break;
#endif
		}
	}
	return 0;
}

/*********************************************************************
 Modem-Emulator-Routines
 *********************************************************************/

#define cmdchar(c) ((c>=' ')&&(c<=0x7f))

/*
 * Put a message from the AT-emulator into receive-buffer of tty,
 * convert CR, LF, and BS to values