drivers/isdn/i4l/isdn_tty.c - kernel/quantenna - Git at Google

 /*
  * Linux ISDN subsystem, tty functions and AT-command emulator (linklevel).
  *
  * Copyright 1994-1999  by Fritz Elfert (fritz@isdn4linux.de)
  * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg
  *
  * This software may be used and distributed according to the terms
  * of the GNU General Public License, incorporated herein by reference.
  *
  */
 #undef ISDN_TTY_STAT_DEBUG

 #include <linux/isdn.h>
 #include <linux/serial.h> /* ASYNC_* flags */
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/mutex.h>
 #include "isdn_common.h"
 #include "isdn_tty.h"
 #ifdef CONFIG_ISDN_AUDIO
 #include "isdn_audio.h"
 #define VBUF 0x3e0
 #define VBUFX (VBUF/16)
 #endif

 #define FIX_FILE_TRANSFER
 #define	DUMMY_HAYES_AT

 /* Prototypes */

 static DEFINE_MUTEX(modem_info_mutex);
 static int isdn_tty_edit_at(const char *, int, modem_info *);
 static void isdn_tty_check_esc(const u_char *, u_char, int, int *, u_long *);
 static void isdn_tty_modem_reset_regs(modem_info *, int);
 static void isdn_tty_cmd_ATA(modem_info *);
 static void isdn_tty_flush_buffer(struct tty_struct *);
 static void isdn_tty_modem_result(int, modem_info *);
 #ifdef CONFIG_ISDN_AUDIO
 static int isdn_tty_countDLE(unsigned char *, int);
 #endif

 /* Leave this unchanged unless you know what you do! */
 #define MODEM_PARANOIA_CHECK
 #define MODEM_DO_RESTART

 static int bit2si[8] =
 {1, 5, 7, 7, 7, 7, 7, 7};
 static int si2bit[8] =
 {4, 1, 4, 4, 4, 4, 4, 4};

 /* isdn_tty_try_read() is called from within isdn_tty_rcv_skb()
  * to stuff incoming data directly into a tty's flip-buffer. This
  * is done to speed up tty-receiving if the receive-queue is empty.
  * This routine MUST be called with interrupts off.
  * Return:
  *  1 = Success
  *  0 = Failure, data has to be buffered and later processed by
  *      isdn_tty_readmodem().
  */
 static int
 isdn_tty_try_read(modem_info *info, struct sk_buff *skb)
 {
 	struct tty_port *port = &info->port;
 	int c;
 	int len;
 	char last;

 	if (!info->online)
 		return 0;

 	if (!(info->mcr & UART_MCR_RTS))
 		return 0;

 	len = skb->len
 #ifdef CONFIG_ISDN_AUDIO
 		+ ISDN_AUDIO_SKB_DLECOUNT(skb)
 #endif
 		;

 	c = tty_buffer_request_room(port, len);
 	if (c < len)
 		return 0;

 #ifdef CONFIG_ISDN_AUDIO
 	if (ISDN_AUDIO_SKB_DLECOUNT(skb)) {
 		int l = skb->len;
 		unsigned char *dp = skb->data;
 		while (--l) {
 			if (*dp == DLE)
 				tty_insert_flip_char(port, DLE, 0);
 			tty_insert_flip_char(port, *dp++, 0);
 		}
 		if (*dp == DLE)
 			tty_insert_flip_char(port, DLE, 0);
 		last = *dp;
 	} else {
 #endif
 		if (len > 1)
 			tty_insert_flip_string(port, skb->data, len - 1);
 		last = skb->data[len - 1];
 #ifdef CONFIG_ISDN_AUDIO
 	}
 #endif
 	if (info->emu.mdmreg[REG_CPPP] & BIT_CPPP)
 		tty_insert_flip_char(port, last, 0xFF);
 	else
 		tty_insert_flip_char(port, last, TTY_NORMAL);
 	tty_flip_buffer_push(port);
 	kfree_skb(skb);

 	return 1;
 }

 /* isdn_tty_readmodem() is called periodically from within timer-interrupt.
  * It tries getting received data from the receive queue an stuff it into
  * the tty's flip-buffer.
  */
 void
 isdn_tty_readmodem(void)
 {
 	int resched = 0;
 	int midx;
 	int i;
 	int r;
 	modem_info *info;

 	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
 		midx = dev->m_idx[i];
 		if (midx < 0)
 			continue;

 		info = &dev->mdm.info[midx];
 		if (!info->online)
 			continue;

 		r = 0;
 #ifdef CONFIG_ISDN_AUDIO
 		isdn_audio_eval_dtmf(info);
 		if ((info->vonline & 1) && (info->emu.vpar[1]))
 			isdn_audio_eval_silence(info);
 #endif
 		if (info->mcr & UART_MCR_RTS) {
 			/* CISCO AsyncPPP Hack */
 			if (!(info->emu.mdmreg[REG_CPPP] & BIT_CPPP))
 				r = isdn_readbchan_tty(info->isdn_driver,
 						info->isdn_channel,
 						&info->port, 0);
 			else
 				r = isdn_readbchan_tty(info->isdn_driver,
 						info->isdn_channel,
 						&info->port, 1);
 			if (r)
 				tty_flip_buffer_push(&info->port);
 		} else
 			r = 1;

 		if (r) {
 			info->rcvsched = 0;
 			resched = 1;
 		} else
 			info->rcvsched = 1;
 	}
 	if (!resched)
 		isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 0);
 }

 int
 isdn_tty_rcv_skb(int i, int di, int channel, struct sk_buff *skb)
 {
 	ulong flags;
 	int midx;
 #ifdef CONFIG_ISDN_AUDIO
 	int ifmt;
 #endif
 	modem_info *info;

 	if ((midx = dev->m_idx[i]) < 0) {
 		/* if midx is invalid, packet is not for tty */
 		return 0;
 	}
 	info = &dev->mdm.info[midx];
 #ifdef CONFIG_ISDN_AUDIO
 	ifmt = 1;

 	if ((info->vonline) && (!info->emu.vpar[4]))
 		isdn_audio_calc_dtmf(info, skb->data, skb->len, ifmt);
 	if ((info->vonline & 1) && (info->emu.vpar[1]))
 		isdn_audio_calc_silence(info, skb->data, skb->len, ifmt);
 #endif
 	if ((info->online < 2)
 #ifdef CONFIG_ISDN_AUDIO
 	    && (!(info->vonline & 1))
 #endif
 		) {
 		/* If Modem not listening, drop data */
 		kfree_skb(skb);
 		return 1;
 	}
 	if (info->emu.mdmreg[REG_T70] & BIT_T70) {
 		if (info->emu.mdmreg[REG_T70] & BIT_T70_EXT) {
 			/* T.70 decoding: throw away the T.70 header (2 or 4 bytes)   */
 			if (skb->data[0] == 3) /* pure data packet -> 4 byte headers  */
 				skb_pull(skb, 4);
 			else
 				if (skb->data[0] == 1) /* keepalive packet -> 2 byte hdr  */
 					skb_pull(skb, 2);
 		} else
 			/* T.70 decoding: Simply throw away the T.70 header (4 bytes) */
 			if ((skb->data[0] == 1) && ((skb->data[1] == 0) || (skb->data[1] == 1)))
 				skb_pull(skb, 4);
 	}
 #ifdef CONFIG_ISDN_AUDIO
 	ISDN_AUDIO_SKB_DLECOUNT(skb) = 0;
 	ISDN_AUDIO_SKB_LOCK(skb) = 0;
 	if (info->vonline & 1) {
 		/* voice conversion/compression */
 		switch (info->emu.vpar[3]) {
 		case 2:
 		case 3:
 		case 4:
 			/* adpcm
 			 * Since compressed data takes less
 			 * space, we can overwrite the buffer.
 			 */
 			skb_trim(skb, isdn_audio_xlaw2adpcm(info->adpcmr,
 							    ifmt,
 							    skb->data,
 							    skb->data,
 							    skb->len));
 			break;
 		case 5:
 			/* a-law */
 			if (!ifmt)
 				isdn_audio_ulaw2alaw(skb->data, skb->len);
 			break;
 		case 6:
 			/* u-law */
 			if (ifmt)
 				isdn_audio_alaw2ulaw(skb->data, skb->len);
 			break;
 		}
 		ISDN_AUDIO_SKB_DLECOUNT(skb) =
 			isdn_tty_countDLE(skb->data, skb->len);
 	}
 #ifdef CONFIG_ISDN_TTY_FAX
 	else {
 		if (info->faxonline & 2) {
 			isdn_tty_fax_bitorder(info, skb);
 			ISDN_AUDIO_SKB_DLECOUNT(skb) =
 				isdn_tty_countDLE(skb->data, skb->len);
 		}
 	}
 #endif
 #endif
 	/* Try to deliver directly via tty-buf if queue is empty */
 	spin_lock_irqsave(&info->readlock, flags);
 	if (skb_queue_empty(&dev->drv[di]->rpqueue[channel]))
 		if (isdn_tty_try_read(info, skb)) {
 			spin_unlock_irqrestore(&info->readlock, flags);
 			return 1;
 		}
 	/* Direct deliver failed or queue wasn't empty.
 	 * Queue up for later dequeueing via timer-irq.
 	 */
 	__skb_queue_tail(&dev->drv[di]->rpqueue[channel], skb);
 	dev->drv[di]->rcvcount[channel] +=
 		(skb->len
 #ifdef CONFIG_ISDN_AUDIO
 		 + ISDN_AUDIO_SKB_DLECOUNT(skb)
 #endif
 			);
 	spin_unlock_irqrestore(&info->readlock, flags);
 	/* Schedule dequeuing */
 	if ((dev->modempoll) && (info->rcvsched))
 		isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 1);
 	return 1;
 }

 static void
 isdn_tty_cleanup_xmit(modem_info *info)
 {
 	skb_queue_purge(&info->xmit_queue);
 #ifdef CONFIG_ISDN_AUDIO
 	skb_queue_purge(&info->dtmf_queue);
 #endif
 }

 static void
 isdn_tty_tint(modem_info *info)
 {
 	struct sk_buff *skb = skb_dequeue(&info->xmit_queue);
 	int len, slen;

 	if (!skb)
 		return;
 	len = skb->len;
 	if ((slen = isdn_writebuf_skb_stub(info->isdn_driver,
 					   info->isdn_channel, 1, skb)) == len) {
 		struct tty_struct *tty = info->port.tty;
 		info->send_outstanding++;
 		info->msr &= ~UART_MSR_CTS;
 		info->lsr &= ~UART_LSR_TEMT;
 		tty_wakeup(tty);
 		return;
 	}
 	if (slen < 0) {
 		/* Error: no channel, already shutdown, or wrong parameter */
 		dev_kfree_skb(skb);
 		return;
 	}
 	skb_queue_head(&info->xmit_queue, skb);
 }

 #ifdef CONFIG_ISDN_AUDIO
 static int
 isdn_tty_countDLE(unsigned char *buf, int len)
 {
 	int count = 0;

 	while (len--)
 		if (*buf++ == DLE)
 			count++;
 	return count;
 }

 /* This routine is called from within isdn_tty_write() to perform
  * DLE-decoding when sending audio-data.
  */
 static int
 isdn_tty_handleDLEdown(modem_info *info, atemu *m, int len)
 {
 	unsigned char *p = &info->port.xmit_buf[info->xmit_count];
 	int count = 0;

 	while (len > 0) {
 		if (m->lastDLE) {
 			m->lastDLE = 0;
 			switch (*p) {
 			case DLE:
 				/* Escape code */
 				if (len > 1)
 					memmove(p, p + 1, len - 1);
 				p--;
 				count++;
 				break;
 			case ETX:
 				/* End of data */
 				info->vonline |= 4;
 				return count;
 			case DC4:
 				/* Abort RX */
 				info->vonline &= ~1;
 #ifdef ISDN_DEBUG_MODEM_VOICE
 				printk(KERN_DEBUG
 				       "DLEdown: got DLE-DC4, send DLE-ETX on ttyI%d\n",
 				       info->line);
 #endif
 				isdn_tty_at_cout("\020\003", info);
 				if (!info->vonline) {
 #ifdef ISDN_DEBUG_MODEM_VOICE
 					printk(KERN_DEBUG
 					       "DLEdown: send VCON on ttyI%d\n",
 					       info->line);
 #endif
 					isdn_tty_at_cout("\r\nVCON\r\n", info);
 				}
 				/* Fall through */
 			case 'q':
 			case 's':
 				/* Silence */
 				if (len > 1)
 					memmove(p, p + 1, len - 1);
 				p--;
 				break;
 			}
 		} else {
 			if (*p == DLE)
 				m->lastDLE = 1;
 			else
 				count++;
 		}
 		p++;
 		len--;
 	}
 	if (len < 0) {
 		printk(KERN_WARNING "isdn_tty: len<0 in DLEdown\n");
 		return 0;
 	}
 	return count;
 }

 /* This routine is called from within isdn_tty_write() when receiving
  * audio-data. It interrupts receiving, if an character other than
  * ^S or ^Q is sent.
  */
 static int
 isdn_tty_end_vrx(const char *buf, int c)
 {
 	char ch;

 	while (c--) {
 		ch = *buf;
 		if ((ch != 0x11) && (ch != 0x13))
 			return 1;
 		buf++;
 	}
 	return 0;
 }

 static int voice_cf[7] =
 {0, 0, 4, 3, 2, 0, 0};

 #endif                          /* CONFIG_ISDN_AUDIO */

 /* isdn_tty_senddown() is called either directly from within isdn_tty_write()
  * or via timer-interrupt from within isdn_tty_modem_xmit(). It pulls
  * outgoing data from the tty's xmit-buffer, handles voice-decompression or
  * T.70 if necessary, and finally queues it up for sending via isdn_tty_tint.
  */
 static void
 isdn_tty_senddown(modem_info *info)
 {
 	int buflen;
 	int skb_res;
 #ifdef CONFIG_ISDN_AUDIO
 	int audio_len;
 #endif
 	struct sk_buff *skb;

 #ifdef CONFIG_ISDN_AUDIO
 	if (info->vonline & 4) {
 		info->vonline &= ~6;
 		if (!info->vonline) {
 #ifdef ISDN_DEBUG_MODEM_VOICE
 			printk(KERN_DEBUG
 			       "senddown: send VCON on ttyI%d\n",
 			       info->line);
 #endif
 			isdn_tty_at_cout("\r\nVCON\r\n", info);
 		}
 	}
 #endif
 	if (!(buflen = info->xmit_count))
 		return;
 	if ((info->emu.mdmreg[REG_CTS] & BIT_CTS) != 0)
 		info->msr &= ~UART_MSR_CTS;
 	info->lsr &= ~UART_LSR_TEMT;
 	/* info->xmit_count is modified here and in isdn_tty_write().
 	 * So we return here if isdn_tty_write() is in the
 	 * critical section.
 	 */
 	atomic_inc(&info->xmit_lock);
 	if (!(atomic_dec_and_test(&info->xmit_lock)))
 		return;
 	if (info->isdn_driver < 0) {
 		info->xmit_count = 0;
 		return;
 	}
 	skb_res = dev->drv[info->isdn_driver]->interface->hl_hdrlen + 4;
 #ifdef CONFIG_ISDN_AUDIO
 	if (info->vonline & 2)
 		audio_len = buflen * voice_cf[info->emu.vpar[3]];
 	else
 		audio_len = 0;
 	skb = dev_alloc_skb(skb_res + buflen + audio_len);
 #else
 	skb = dev_alloc_skb(skb_res + buflen);
 #endif
 	if (!skb) {
 		printk(KERN_WARNING
 		       "isdn_tty: Out of memory in ttyI%d senddown\n",
 		       info->line);
 		return;
 	}
 	skb_reserve(skb, skb_res);
 	memcpy(skb_put(skb, buflen), info->port.xmit_buf, buflen);
 	info->xmit_count = 0;
 #ifdef CONFIG_ISDN_AUDIO
 	if (info->vonline & 2) {
 		/* For now, ifmt is fixed to 1 (alaw), since this
 		 * is used with ISDN everywhere in the world, except
 		 * US, Canada and Japan.
 		 * Later, when US-ISDN protocols are implemented,
 		 * this setting will depend on the D-channel protocol.
 		 */
 		int ifmt = 1;

 		/* voice conversion/decompression */
 		switch (info->emu.vpar[3]) {
 		case 2:
 		case 3:
 		case 4:
 			/* adpcm, compatible to ZyXel 1496 modem
 			 * with ROM revision 6.01
 			 */
 			audio_len = isdn_audio_adpcm2xlaw(info->adpcms,
 							  ifmt,
 							  skb->data,
 							  skb_put(skb, audio_len),
 							  buflen);
 			skb_pull(skb, buflen);
 			skb_trim(skb, audio_len);
 			break;
 		case 5:
 			/* a-law */
 			if (!ifmt)
 				isdn_audio_alaw2ulaw(skb->data,
 						     buflen);
 			break;
 		case 6:
 			/* u-law */
 			if (ifmt)
 				isdn_audio_ulaw2alaw(skb->data,
 						     buflen);
 			break;
 		}
 	}
 #endif                          /* CONFIG_ISDN_AUDIO */
 	if (info->emu.mdmreg[REG_T70] & BIT_T70) {
 		/* Add T.70 simplified header */
 		if (info->emu.mdmreg[REG_T70] & BIT_T70_EXT)
 			memcpy(skb_push(skb, 2), "\1\0", 2);
 		else
 			memcpy(skb_push(skb, 4), "\1\0\1\0", 4);
 	}
 	skb_queue_tail(&info->xmit_queue, skb);
 }

 /************************************************************
  *
  * Modem-functions
  *
  * mostly "stolen" from original Linux-serial.c and friends.
  *
  ************************************************************/

 /* The next routine is called once from within timer-interrupt
  * triggered within isdn_tty_modem_ncarrier(). It calls
  * isdn_tty_modem_result() to stuff a "NO CARRIER" Message
  * into the tty's buffer.
  */
 static void
 isdn_tty_modem_do_ncarrier(unsigned long data)
 {
 	modem_info *info = (modem_info *) data;
 	isdn_tty_modem_result(RESULT_NO_CARRIER, info);
 }

 /* Next routine is called, whenever the DTR-signal is raised.
  * It checks the ncarrier-flag, and triggers the above routine
  * when necessary. The ncarrier-flag is set, whenever DTR goes
  * low.
  */
 static void
 isdn_tty_modem_ncarrier(modem_info *info)
 {
 	if (info->ncarrier) {
 		info->nc_timer.expires = jiffies + HZ;
 		add_timer(&info->nc_timer);
 	}
 }

 /*
  * return the usage calculated by si and layer 2 protocol
  */
 static int
 isdn_calc_usage(int si, int l2)
 {
 	int usg = ISDN_USAGE_MODEM;

 #ifdef CONFIG_ISDN_AUDIO
 	if (si == 1) {
 		switch (l2) {
 		case ISDN_PROTO_L2_MODEM:
 			usg = ISDN_USAGE_MODEM;
 			break;
 #ifdef CONFIG_ISDN_TTY_FAX
 		case ISDN_PROTO_L2_FAX:
 			usg = ISDN_USAGE_FAX;
 			break;
 #endif
 		case ISDN_PROTO_L2_TRANS:
 		default:
 			usg = ISDN_USAGE_VOICE;
 			break;
 		}
 	}
 #endif
 	return (usg);
 }

 /* isdn_tty_dial() performs dialing of a tty an the necessary
  * setup of the lower levels before that.
  */
 static void
 isdn_tty_dial(char *n, modem_info *info, atemu *m)
 {
 	int usg = ISDN_USAGE_MODEM;
 	int si = 7;
 	int l2 = m->mdmreg[REG_L2PROT];
 	u_long flags;
 	isdn_ctrl cmd;
 	int i;
 	int j;

 	for (j = 7; j >= 0; j--)
 		if (m->mdmreg[REG_SI1] & (1 << j)) {
 			si = bit2si[j];
 			break;
 		}
 	usg = isdn_calc_usage(si, l2);
 #ifdef CONFIG_ISDN_AUDIO
 	if ((si == 1) &&
 	    (l2 != ISDN_PROTO_L2_MODEM)
 #ifdef CONFIG_ISDN_TTY_FAX
 	    && (l2 != ISDN_PROTO_L2_FAX)
 #endif
 		) {
 		l2 = ISDN_PROTO_L2_TRANS;
 		usg = ISDN_USAGE_VOICE;
 	}
 #endif
 	m->mdmreg[REG_SI1I] = si2bit[si];
 	spin_lock_irqsave(&dev->lock, flags);
 	i = isdn_get_free_channel(usg, l2, m->mdmreg[REG_L3PROT], -1, -1, m->msn);
 	if (i < 0) {
 		spin_unlock_irqrestore(&dev->lock, flags);
 		isdn_tty_modem_result(RESULT_NO_DIALTONE, info);
 	} else {
 		info->isdn_driver = dev->drvmap[i];
 		info->isdn_channel = dev->chanmap[i];
 		info->drv_index = i;
 		dev->m_idx[i] = info->line;
 		dev->usage[i] |= ISDN_USAGE_OUTGOING;
 		info->last_dir = 1;
 		strcpy(info->last_num, n);
 		isdn_info_update();
 		spin_unlock_irqrestore(&dev->lock, flags);
 		cmd.driver = info->isdn_driver;
 		cmd.arg = info->isdn_channel;
 		cmd.command = ISDN_CMD_CLREAZ;
 		isdn_command(&cmd);
 		strcpy(cmd.parm.num, isdn_map_eaz2msn(m->msn, info->isdn_driver));
 		cmd.driver = info->isdn_driver;
 		cmd.command = ISDN_CMD_SETEAZ;
 		isdn_command(&cmd);
 		cmd.driver = info->isdn_driver;
 		cmd.command = ISDN_CMD_SETL2;
 		info->last_l2 = l2;
 		cmd.arg = info->isdn_channel + (l2 << 8);
 		isdn_command(&cmd);
 		cmd.driver = info->isdn_driver;
 		cmd.command = ISDN_CMD_SETL3;
 		cmd.arg = info->isdn_channel + (m->mdmreg[REG_L3PROT] << 8);
 #ifdef CONFIG_ISDN_TTY_FAX
 		if (l2 == ISDN_PROTO_L2_FAX) {
 			cmd.parm.fax = info->fax;
 			info->fax->direction = ISDN_TTY_FAX_CONN_OUT;
 		}
 #endif
 		isdn_command(&cmd);
 		cmd.driver = info->isdn_driver;
 		cmd.arg = info->isdn_channel;
 		sprintf(cmd.parm.setup.phone, "%s", n);
 		sprintf(cmd.parm.setup.eazmsn, "%s",
 			isdn_map_eaz2msn(m->msn, info->isdn_driver));
 		cmd.parm.setup.si1 = si;
 		cmd.parm.setup.si2 = m->mdmreg[REG_SI2];
 		cmd.command = ISDN_CMD_DIAL;
 		info->dialing = 1;
 		info->emu.carrierwait = 0;
 		strcpy(dev->num[i], n);
 		isdn_info_update();
 		isdn_command(&cmd);
 		isdn_timer_ctrl(ISDN_TIMER_CARRIER, 1);
 	}
 }

 /* isdn_tty_hangup() disassociates a tty from the real
  * ISDN-line (hangup). The usage-status is cleared
  * and some cleanup is done also.
  */
 void
 isdn_tty_modem_hup(modem_info *info, int local)
 {
 	isdn_ctrl cmd;
 	int di, ch;

 	if (!info)
 		return;

 	di = info->isdn_driver;
 	ch = info->isdn_channel;
 	if (di < 0 || ch < 0)
 		return;

 	info->isdn_driver = -1;
 	info->isdn_channel = -1;

 #ifdef ISDN_DEBUG_MODEM_HUP
 	printk(KERN_DEBUG "Mhup ttyI%d\n", info->line);
 #endif
 	info->rcvsched = 0;
 	isdn_tty_flush_buffer(info->port.tty);
 	if (info->online) {
 		info->last_lhup = local;
 		info->online = 0;
 		isdn_tty_modem_result(RESULT_NO_CARRIER, info);
 	}
 #ifdef CONFIG_ISDN_AUDIO
 	info->vonline = 0;
 #ifdef CONFIG_ISDN_TTY_FAX
 	info->faxonline = 0;
 	info->fax->phase = ISDN_FAX_PHASE_IDLE;
 #endif
 	info->emu.vpar[4] = 0;
 	info->emu.vpar[5] = 8;
 	kfree(info->dtmf_state);
 	info->dtmf_state = NULL;
 	kfree(info->silence_state);
 	info->silence_state = NULL;
 	kfree(info->adpcms);
 	info->adpcms = NULL;
 	kfree(info->adpcmr);
 	info->adpcmr = NULL;
 #endif
 	if ((info->msr & UART_MSR_RI) &&
 	    (info->emu.mdmreg[REG_RUNG] & BIT_RUNG))
 		isdn_tty_modem_result(RESULT_RUNG, info);
 	info->msr &= ~(UART_MSR_DCD | UART_MSR_RI);
 	info->lsr |= UART_LSR_TEMT;

 	if (local) {
 		cmd.driver = di;
 		cmd.command = ISDN_CMD_HANGUP;
 		cmd.arg = ch;
 		isdn_command(&cmd);
 	}

 	isdn_all_eaz(di, ch);
 	info->emu.mdmreg[REG_RINGCNT] = 0;
 	isdn_free_channel(di, ch, 0);

 	if (info->drv_index >= 0) {
 		dev->m_idx[info->drv_index] = -1;
 		info->drv_index = -1;
 	}
 }

 /*
  * Begin of a CAPI like interface, currently used only for
  * supplementary service (CAPI 2.0 part III)
  */
 #include <linux/isdn/capicmd.h>
 #include <linux/module.h>

 int
 isdn_tty_capi_facility(capi_msg *cm) {
 	return (-1); /* dummy */
 }

 /* isdn_tty_suspend() tries to suspend the current tty connection
  */
 static void
 isdn_tty_suspend(char *id, modem_info *info, atemu *m)
 {
 	isdn_ctrl cmd;

 	int l;

 	if (!info)
 		return;

 #ifdef ISDN_DEBUG_MODEM_SERVICES
 	printk(KERN_DEBUG "Msusp ttyI%d\n", info->line);
 #endif
 	l = strlen(id);
 	if ((info->isdn_driver >= 0)) {
 		cmd.parm.cmsg.Length = l + 18;
 		cmd.parm.cmsg.Command = CAPI_FACILITY;
 		cmd.parm.cmsg.Subcommand = CAPI_REQ;
 		cmd.parm.cmsg.adr.Controller = info->isdn_driver + 1;
 		cmd.parm.cmsg.para[0] = 3; /* 16 bit 0x0003 suplementary service */
 		cmd.parm.cmsg.para[1] = 0;
 		cmd.parm.cmsg.para[2] = l + 3;
 		cmd.parm.cmsg.para[3] = 4; /* 16 bit 0x0004 Suspend */
 		cmd.parm.cmsg.para[4] = 0;
 		cmd.parm.cmsg.para[5] = l;
 		strncpy(&cmd.parm.cmsg.para[6], id, l);
 		cmd.command = CAPI_PUT_MESSAGE;
 		cmd.driver = info->isdn_driver;
 		cmd.arg = info->isdn_channel;
 		isdn_command(&cmd);
 	}
 }

 /* isdn_tty_resume() tries to resume a suspended call
  * setup of the lower levels before that. unfortunately here is no
  * checking for compatibility of used protocols implemented by Q931
  * It does the same things like isdn_tty_dial, the last command
  * is different, may be we can merge it.
  */

 static void
 isdn_tty_resume(char *id, modem_info *info, atemu *m)
 {
 	int usg = ISDN_USAGE_MODEM;
 	int si = 7;
 	int l2 = m->mdmreg[REG_L2PROT];
 	isdn_ctrl cmd;
 	ulong flags;
 	int i;
 	int j;
 	int l;

 	l = strlen(id);
 	for (j = 7; j >= 0; j--)
 		if (m->mdmreg[REG_SI1] & (1 << j)) {
 			si = bit2si[j];
 			break;
 		}
 	usg = isdn_calc_usage(si, l2);
 #ifdef CONFIG_ISDN_AUDIO
 	if ((si == 1) &&
 	    (l2 != ISDN_PROTO_L2_MODEM)
 #ifdef CONFIG_ISDN_TTY_FAX
 	    && (l2 != ISDN_PROTO_L2_FAX)
 #endif
 		) {
 		l2 = ISDN_PROTO_L2_TRANS;
 		usg = ISDN_USAGE_VOICE;
 	}
 #endif
 	m->mdmreg[REG_SI1I] = si2bit[si];
 	spin_lock_irqsave(&dev->lock, flags);
 	i = isdn_get_free_channel(usg, l2, m->mdmreg[REG_L3PROT], -1, -1, m->msn);
 	if (i < 0) {
 		spin_unlock_irqrestore(&dev->lock, flags);
 		isdn_tty_modem_result(RESULT_NO_DIALTONE, info);
 	} else {
 		info->isdn_driver = dev->drvmap[i];
 		info->isdn_channel = dev->chanmap[i];
 		info->drv_index = i;
 		dev->m_idx[i] = info->line;
 		dev->usage[i] |= ISDN_USAGE_OUTGOING;
 		info->last_dir = 1;
 //		strcpy(info->last_num, n);
 		isdn_info_update();
 		spin_unlock_irqrestore(&dev->lock, flags);
 		cmd.driver = info->isdn_driver;
 		cmd.arg = info->isdn_channel;
 		cmd.command = ISDN_CMD_CLREAZ;
 		isdn_command(&cmd);
 		strcpy(cmd.parm.num, isdn_map_eaz2msn(m->msn, info->isdn_driver));
 		cmd.driver = info->isdn_driver;
 		cmd.command = ISDN_CMD_SETEAZ;
 		isdn_command(&cmd);
 		cmd.driver = info->isdn_driver;
 		cmd.command = ISDN_CMD_SETL2;
 		info->last_l2 = l2;
 		cmd.arg = info->isdn_channel + (l2 << 8);
 		isdn_command(&cmd);
 		cmd.driver = info->isdn_driver;
 		cmd.command = ISDN_CMD_SETL3;
 		cmd.arg = info->isdn_channel + (m->mdmreg[REG_L3PROT] << 8);
 		isdn_command(&cmd);
 		cmd.driver = info->isdn_driver;
 		cmd.arg = info->isdn_channel;
 		cmd.parm.cmsg.Length = l + 18;
 		cmd.parm.cmsg.Command = CAPI_FACILITY;
 		cmd.parm.cmsg.Subcommand = CAPI_REQ;
 		cmd.parm.cmsg.adr.Controller = info->isdn_driver + 1;
 		cmd.parm.cmsg.para[0] = 3; /* 16 bit 0x0003 suplementary service */
 		cmd.parm.cmsg.para[1] = 0;
 		cmd.parm.cmsg.para[2] = l + 3;
 		cmd.parm.cmsg.para[3] = 5; /* 16 bit 0x0005 Resume */
 		cmd.parm.cmsg.para[4] = 0;
 		cmd.parm.cmsg.para[5] = l;
 		strncpy(&cmd.parm.cmsg.para[6], id, l);
 		cmd.command = CAPI_PUT_MESSAGE;
 		info->dialing = 1;
 //		strcpy(dev->num[i], n);
 		isdn_info_update();
 		isdn_command(&cmd);
 		isdn_timer_ctrl(ISDN_TIMER_CARRIER, 1);
 	}
 }

 /* isdn_tty_send_msg() sends a message to a HL driver
  * This is used for hybrid modem cards to send AT commands to it
  */

 static void
 isdn_tty_send_msg(modem_info *info, atemu *m, char *msg)
 {
 	int usg = ISDN_USAGE_MODEM;
 	int si = 7;
 	int l2 = m->mdmreg[REG_L2PROT];
 	isdn_ctrl cmd;
 	ulong flags;
 	int i;
 	int j;
 	int l;

 	l = min(strlen(msg), sizeof(cmd.parm) - sizeof(cmd.parm.cmsg)
 		+ sizeof(cmd.parm.cmsg.para) - 2);

 	if (!l) {
 		isdn_tty_modem_result(RESULT_ERROR, info);
 		return;
 	}
 	for (j = 7; j >= 0; j--)
 		if (m->mdmreg[REG_SI1] & (1 << j)) {
 			si = bit2si[j];
 			break;
 		}
 	usg = isdn_calc_usage(si, l2);
 #ifdef CONFIG_ISDN_AUDIO
 	if ((si == 1) &&
 	    (l2 != ISDN_PROTO_L2_MODEM)
 #ifdef CONFIG_ISDN_TTY_FAX
 	    && (l2 != ISDN_PROTO_L2_FAX)
 #endif
 		) {
 		l2 = ISDN_PROTO_L2_TRANS;
 		usg = ISDN_USAGE_VOICE;
 	}
 #endif
 	m->mdmreg[REG_SI1I] = si2bit[si];
 	spin_lock_irqsave(&dev->lock, flags);
 	i = isdn_get_free_channel(usg, l2, m->mdmreg[REG_L3PROT], -1, -1, m->msn);
 	if (i < 0) {
 		spin_unlock_irqrestore(&dev->lock, flags);
 		isdn_tty_modem_result(RESULT_NO_DIALTONE, info);
 	} else {
 		info->isdn_driver = dev->drvmap[i];
 		info->isdn_channel = dev->chanmap[i];
 		info->drv_index = i;
 		dev->m_idx[i] = info->line;
 		dev->usage[i] |= ISDN_USAGE_OUTGOING;
 		info->last_dir = 1;
 		isdn_info_update();
 		spin_unlock_irqrestore(&dev->lock, flags);
 		cmd.driver = info->isdn_driver;
 		cmd.arg = info->isdn_channel;
 		cmd.command = ISDN_CMD_CLREAZ;
 		isdn_command(&cmd);
 		strcpy(cmd.parm.num, isdn_map_eaz2msn(m->msn, info->isdn_driver));
 		cmd.driver = info->isdn_driver;
 		cmd.command = ISDN_CMD_SETEAZ;
 		isdn_command(&cmd);
 		cmd.driver = info->isdn_driver;
 		cmd.command = ISDN_CMD_SETL2;
 		info->last_l2 = l2;
 		cmd.arg = info->isdn_channel + (l2 << 8);
 		isdn_command(&cmd);
 		cmd.driver = info->isdn_driver;
 		cmd.command = ISDN_CMD_SETL3;
 		cmd.arg = info->isdn_channel + (m->mdmreg[REG_L3PROT] << 8);
 		isdn_command(&cmd);
 		cmd.driver = info->isdn_driver;
 		cmd.arg = info->isdn_channel;
 		cmd.parm.cmsg.Length = l + 14;
 		cmd.parm.cmsg.Command = CAPI_MANUFACTURER;
 		cmd.parm.cmsg.Subcommand = CAPI_REQ;
 		cmd.parm.cmsg.adr.Controller = info->isdn_driver + 1;
 		cmd.parm.cmsg.para[0] = l + 1;
 		strncpy(&cmd.parm.cmsg.para[1], msg, l);
 		cmd.parm.cmsg.para[l + 1] = 0xd;
 		cmd.command = CAPI_PUT_MESSAGE;
 /*		info->dialing = 1;
 		strcpy(dev->num[i], n);
 		isdn_info_update();
 */
 		isdn_command(&cmd);
 	}
 }

 static inline int
 isdn_tty_paranoia_check(modem_info *info, char *name, const char *routine)
 {
 #ifdef MODEM_PARANOIA_CHECK
 	if (!info) {
 		printk(KERN_WARNING "isdn_tty: null info_struct for %s in %s\n",
 		       name, routine);
 		return 1;
 	}
 	if (info->magic != ISDN_ASYNC_MAGIC) {
 		printk(KERN_WARNING "isdn_tty: bad magic for modem struct %s in %s\n",
 		       name, routine);
 		return 1;
 	}
 #endif
 	return 0;
 }

 /*
  * This routine is called to set the UART divisor registers to match
  * the specified baud rate for a serial port.
  */
 static void
 isdn_tty_change_speed(modem_info *info)
 {
 	struct tty_port *port = &info->port;
 	uint cflag,
 		cval,
 		quot;
 	int i;

 	if (!port->tty)
 		return;
 	cflag = port->tty->termios.c_cflag;

 	quot = i = cflag & CBAUD;
 	if (i & CBAUDEX) {
 		i &= ~CBAUDEX;
 		if (i < 1 || i > 2)
 			port->tty->termios.c_cflag &= ~CBAUDEX;
 		else
 			i += 15;
 	}
 	if (quot) {
 		info->mcr |= UART_MCR_DTR;
 		isdn_tty_modem_ncarrier(info);
 	} else {
 		info->mcr &= ~UART_MCR_DTR;
 		if (info->emu.mdmreg[REG_DTRHUP] & BIT_DTRHUP) {
 #ifdef ISDN_DEBUG_MODEM_HUP
 			printk(KERN_DEBUG "Mhup in changespeed\n");
 #endif
 			if (info->online)
 				info->ncarrier = 1;
 			isdn_tty_modem_reset_regs(info, 0);
 			isdn_tty_modem_hup(info, 1);
 		}
 		return;
 	}
 	/* byte size and parity */
 	cval = cflag & (CSIZE | CSTOPB);
 	cval >>= 4;
 	if (cflag & PARENB)
 		cval |= UART_LCR_PARITY;
 	if (!(cflag & PARODD))
 		cval |= UART_LCR_EPAR;

 	tty_port_set_check_carrier(port, ~cflag & CLOCAL);
 }

 static int
 isdn_tty_startup(modem_info *info)
 {
 	if (tty_port_initialized(&info->port))
 		return 0;
 	isdn_lock_drivers();
 #ifdef ISDN_DEBUG_MODEM_OPEN
 	printk(KERN_DEBUG "starting up ttyi%d ...\n", info->line);
 #endif
 	/*
 	 * Now, initialize the UART
 	 */
 	info->mcr = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
 	if (info->port.tty)
 		clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
 	/*
 	 * and set the speed of the serial port
 	 */
 	isdn_tty_change_speed(info);

 	tty_port_set_initialized(&info->port, 1);
 	info->msr |= (UART_MSR_DSR | UART_MSR_CTS);
 	info->send_outstanding = 0;
 	return 0;
 }

 /*
  * This routine will shutdown a serial port; interrupts are disabled, and
  * DTR is dropped if the hangup on close termio flag is on.
  */
 static void
 isdn_tty_shutdown(modem_info *info)
 {
 	if (!tty_port_initialized(&info->port))
 		return;
 #ifdef ISDN_DEBUG_MODEM_OPEN
 	printk(KERN_DEBUG "Shutting down isdnmodem port %d ....\n", info->line);
 #endif
 	isdn_unlock_drivers();
 	info->msr &= ~UART_MSR_RI;
 	if (!info->port.tty || (info->port.tty->termios.c_cflag & HUPCL)) {
 		info->mcr &= ~(UART_MCR_DTR | UART_MCR_RTS);
 		if (info->emu.mdmreg[REG_DTRHUP] & BIT_DTRHUP) {
 			isdn_tty_modem_reset_regs(info, 0);
 #ifdef ISDN_DEBUG_MODEM_HUP
 			printk(KERN_DEBUG "Mhup in isdn_tty_shutdown\n");
 #endif
 			isdn_tty_modem_hup(info, 1);
 		}
 	}
 	if (info->port.tty)
 		set_bit(TTY_IO_ERROR, &info->port.tty->flags);

 	tty_port_set_initialized(&info->port, 0);
 }

 /* isdn_tty_write() is the main send-routine. It is called from the upper
  * levels within the kernel to perform sending data. Depending on the
  * online-flag it either directs output to the at-command-interpreter or
  * to the lower level. Additional tasks done here:
  *  - If online, check for escape-sequence (+++)
  *  - If sending audio-data, call isdn_tty_DLEdown() to parse DLE-codes.
  *  - If receiving audio-data, call isdn_tty_end_vrx() to abort if needed.
  *  - If dialing, abort dial.
  */
 static int
 isdn_tty_write(struct tty_struct *tty, const u_char *buf, int count)
 {
 	int c;
 	int total = 0;
 	modem_info *info = (modem_info *) tty->driver_data;
 	atemu *m = &info->emu;

 	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_write"))
 		return 0;
 	/* See isdn_tty_senddown() */
 	atomic_inc(&info->xmit_lock);
 	while (1) {
 		c = count;
 		if (c > info->xmit_size - info->xmit_count)
 			c = info->xmit_size - info->xmit_count;
 		if (info->isdn_driver >= 0 && c > dev->drv[info->isdn_driver]->maxbufsize)
 			c = dev->drv[info->isdn_driver]->maxbufsize;
 		if (c <= 0)
 			break;
 		if ((info->online > 1)
 #ifdef CONFIG_ISDN_AUDIO
 		    || (info->vonline & 3)
 #endif
 			) {
 #ifdef CONFIG_ISDN_AUDIO
 			if (!info->vonline)
 #endif
 				isdn_tty_check_esc(buf, m->mdmreg[REG_ESC], c,
 						   &(m->pluscount),
 						   &(m->lastplus));
 			memcpy(&info->port.xmit_buf[info->xmit_count], buf, c);
 #ifdef CONFIG_ISDN_AUDIO
 			if (info->vonline) {
 				int cc = isdn_tty_handleDLEdown(info, m, c);
 				if (info->vonline & 2) {
 					if (!cc) {
 						/* If DLE decoding results in zero-transmit, but
 						 * c originally was non-zero, do a wakeup.
 						 */
 						tty_wakeup(tty);
 						info->msr |= UART_MSR_CTS;
 						info->lsr |= UART_LSR_TEMT;
 					}
 					info->xmit_count += cc;
 				}
 				if ((info->vonline & 3) == 1) {
 					/* Do NOT handle Ctrl-Q or Ctrl-S
 					 * when in full-duplex audio mode.
 					 */
 					if (isdn_tty_end_vrx(buf, c)) {
 						info->vonline &= ~1;
 #ifdef ISDN_DEBUG_MODEM_VOICE
 						printk(KERN_DEBUG
 						       "got !^Q/^S, send DLE-ETX,VCON on ttyI%d\n",
 						       info->line);
 #endif
 						isdn_tty_at_cout("\020\003\r\nVCON\r\n", info);
 					}
 				}
 			} else
 				if (TTY_IS_FCLASS1(info)) {
 					int cc = isdn_tty_handleDLEdown(info, m, c);

 					if (info->vonline & 4) { /* ETX seen */
 						isdn_ctrl c;

 						c.command = ISDN_CMD_FAXCMD;
 						c.driver = info->isdn_driver;
 						c.arg = info->isdn_channel;
 						c.parm.aux.cmd = ISDN_FAX_CLASS1_CTRL;
 						c.parm.aux.subcmd = ETX;
 						isdn_command(&c);
 					}
 					info->vonline = 0;
 #ifdef ISDN_DEBUG_MODEM_VOICE
 					printk(KERN_DEBUG "fax dle cc/c %d/%d\n", cc, c);
 #endif
 					info->xmit_count += cc;
 				} else
 #endif
 					info->xmit_count += c;
 		} else {
 			info->msr |= UART_MSR_CTS;
 			info->lsr |= UART_LSR_TEMT;
 			if (info->dialing) {
 				info->dialing = 0;
 #ifdef ISDN_DEBUG_MODEM_HUP
 				printk(KERN_DEBUG "Mhup in isdn_tty_write\n");
 #endif
 				isdn_tty_modem_result(RESULT_NO_CARRIER, info);
 				isdn_tty_modem_hup(info, 1);
 			} else
 				c = isdn_tty_edit_at(buf, c, info);
 		}
 		buf += c;
 		count -= c;
 		total += c;
 	}
 	atomic_dec(&info->xmit_lock);
 	if ((info->xmit_count) || !skb_queue_empty(&info->xmit_queue)) {
 		if (m->mdmreg[REG_DXMT] & BIT_DXMT) {
 			isdn_tty_senddown(info);
 			isdn_tty_tint(info);
 		}
 		isdn_timer_ctrl(ISDN_TIMER_MODEMXMIT, 1);
 	}
 	return total;
 }

 static int
 isdn_tty_write_room(struct tty_struct *tty)
 {
 	modem_info *info = (modem_info *) tty->driver_data;
 	int ret;

 	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_write_room"))
 		return 0;
 	if (!info->online)
 		return info->xmit_size;
 	ret = info->xmit_size - info->xmit_count;
 	return (ret < 0) ? 0 : ret;
 }

 static int
 isdn_tty_chars_in_buffer(struct tty_struct *tty)
 {
 	modem_info *info = (modem_info *) tty->driver_data;

 	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_chars_in_buffer"))
 		return 0;
 	if (!info->online)
 		return 0;
 	return (info->xmit_count);
 }

 static void
 isdn_tty_flush_buffer(struct tty_struct *tty)
 {
 	modem_info *info;

 	if (!tty) {
 		return;
 	}
 	info = (modem_info *) tty->driver_data;
 	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_flush_buffer")) {
 		return;
 	}
 	isdn_tty_cleanup_xmit(info);
 	info->xmit_count = 0;
 	tty_wakeup(tty);
 }

 static void
 isdn_tty_flush_chars(struct tty_struct *tty)
 {
 	modem_info *info = (modem_info *) tty->driver_data;

 	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_flush_chars"))
 		return;
 	if ((info->xmit_count) || !skb_queue_empty(&info->xmit_queue))
 		isdn_timer_ctrl(ISDN_TIMER_MODEMXMIT, 1);
 }

 /*
  * ------------------------------------------------------------
  * isdn_tty_throttle()
  *
  * This routine is called by the upper-layer tty layer to signal that
  * incoming characters should be throttled.
  * ------------------------------------------------------------
  */
 static void
 isdn_tty_throttle(struct tty_struct *tty)
 {
 	modem_info *info = (modem_info *) tty->driver_data;

 	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_throttle"))
 		return;
 	if (I_IXOFF(tty))
 		info->x_char = STOP_CHAR(tty);
 	info->mcr &= ~UART_MCR_RTS;
 }

 static void
 isdn_tty_unthrottle(struct tty_struct *tty)
 {
 	modem_info *info = (modem_info *) tty->driver_data;

 	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_unthrottle"))
 		return;
 	if (I_IXOFF(tty)) {
 		if (info->x_char)
 			info->x_char = 0;
 		else
 			info->x_char = START_CHAR(tty);
 	}
 	info->mcr |= UART_MCR_RTS;
 }

 /*
  * ------------------------------------------------------------
  * isdn_tty_ioctl() and friends
  * ------------------------------------------------------------
  */

 /*
  * isdn_tty_get_lsr_info - get line status register info
  *
  * Purpose: Let user call ioctl() to get info when the UART physically
  *          is emptied.  On bus types like RS485, the transmitter must
  *          release the bus after transmitting. This must be done when
  *          the transmit shift register is empty, not be done when the
  *          transmit holding register is empty.  This functionality
  *          allows RS485 driver to be written in user space.
  */
 static int
 isdn_tty_get_lsr_info(modem_info *info, uint __user *value)
 {
 	u_char status;
 	uint result;

 	status = info->lsr;
 	result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
 	return put_user(result, value);
 }


 static int
 isdn_tty_tiocmget(struct tty_struct *tty)
 {
 	modem_info *info = (modem_info *) tty->driver_data;
 	u_char control, status;

 	if (isdn_tty_paranoia_check(info, tty->name, __func__))
 		return -ENODEV;
 	if (tty_io_error(tty))
 		return -EIO;

 	mutex_lock(&modem_info_mutex);
 #ifdef ISDN_DEBUG_MODEM_IOCTL
 	printk(KERN_DEBUG "ttyI%d ioctl TIOCMGET\n", info->line);
 #endif

 	control = info->mcr;
 	status = info->msr;
 	mutex_unlock(&modem_info_mutex);
 	return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
 		| ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
 		| ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
 		| ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
 		| ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
 		| ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
 }

 static int
 isdn_tty_tiocmset(struct tty_struct *tty,
 		  unsigned int set, unsigned int clear)
 {
 	modem_info *info = (modem_info *) tty->driver_data;

 	if (isdn_tty_paranoia_check(info, tty->name, __func__))
 		return -ENODEV;
 	if (tty_io_error(tty))
 		return -EIO;

 #ifdef ISDN_DEBUG_MODEM_IOCTL
 	printk(KERN_DEBUG "ttyI%d ioctl TIOCMxxx: %x %x\n", info->line, set, clear);
 #endif

 	mutex_lock(&modem_info_mutex);
 	if (set & TIOCM_RTS)
 		info->mcr |= UART_MCR_RTS;
 	if (set & TIOCM_DTR) {
 		info->mcr |= UART_MCR_DTR;
 		isdn_tty_modem_ncarrier(info);
 	}

 	if (clear & TIOCM_RTS)
 		info->mcr &= ~UART_MCR_RTS;
 	if (clear & TIOCM_DTR) {
 		info->mcr &= ~UART_MCR_DTR;
 		if (info->emu.mdmreg[REG_DTRHUP] & BIT_DTRHUP) {
 			isdn_tty_modem_reset_regs(info, 0);
 #ifdef ISDN_DEBUG_MODEM_HUP
 			printk(KERN_DEBUG "Mhup in TIOCMSET\n");
 #endif
 			if (info->online)
 				info->ncarrier = 1;
 			isdn_tty_modem_hup(info, 1);
 		}
 	}
 	mutex_unlock(&modem_info_mutex);
 	return 0;
 }

 static int
 isdn_tty_ioctl(struct tty_struct *tty, uint cmd, ulong arg)
 {
 	modem_info *info = (modem_info *) tty->driver_data;
 	int retval;

 	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_ioctl"))
 		return -ENODEV;
 	if (tty_io_error(tty))
 		return -EIO;
 	switch (cmd) {
 	case TCSBRK:   /* SVID version: non-zero arg --> no break */
 #ifdef ISDN_DEBUG_MODEM_IOCTL
 		printk(KERN_DEBUG "ttyI%d ioctl TCSBRK\n", info->line);
 #endif
 		retval = tty_check_change(tty);
 		if (retval)
 			return retval;
 		tty_wait_until_sent(tty, 0);
 		return 0;
 	case TCSBRKP:  /* support for POSIX tcsendbreak() */
 #ifdef ISDN_DEBUG_MODEM_IOCTL
 		printk(KERN_DEBUG "ttyI%d ioctl TCSBRKP\n", info->line);
 #endif
 		retval = tty_check_change(tty);
 		if (retval)
 			return retval;
 		tty_wait_until_sent(tty, 0);
 		return 0;
 	case TIOCSERGETLSR:	/* Get line status register */
 #ifdef ISDN_DEBUG_MODEM_IOCTL
 		printk(KERN_DEBUG "ttyI%d ioctl TIOCSERGETLSR\n", info->line);
 #endif
 		return isdn_tty_get_lsr_info(info, (uint __user *) arg);
 	default:
 #ifdef ISDN_DEBUG_MODEM_IOCTL
 		printk(KERN_DEBUG "UNKNOWN ioctl 0x%08x on ttyi%d\n", cmd, info->line);
 #endif
 		return -ENOIOCTLCMD;
 	}
 	return 0;
 }

 static void
 isdn_tty_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 {
 	modem_info *info = (modem_info *) tty->driver_data;

 	if (!old_termios)
 		isdn_tty_change_speed(info);
 	else {
 		if (tty->termios.c_cflag == old_termios->c_cflag &&
 		    tty->termios.c_ispeed == old_termios->c_ispeed &&
 		    tty->termios.c_ospeed == old_termios->c_ospeed)
 			return;
 		isdn_tty_change_speed(info);
 	}
 }

 /*
  * ------------------------------------------------------------
  * isdn_tty_open() and friends
  * ------------------------------------------------------------
  */

 static int isdn_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 {
 	modem_info *info = &dev->mdm.info[tty->index];

 	if (isdn_tty_paranoia_check(info, tty->name, __func__))
 		return -ENODEV;

 	tty->driver_data = info;

 	return tty_port_install(&info->port, driver, tty);
 }

 /*
  * This routine is called whenever a serial port is opened.  It
  * enables interrupts for a serial port, linking in its async structure into
  * the IRQ chain.   It also performs the serial-specific
  * initialization for the tty structure.
  */
 static int
 isdn_tty_open(struct tty_struct *tty, struct file *filp)
 {
 	modem_info *info = tty->driver_data;
 	struct tty_port *port = &info->port;
 	int retval;

 #ifdef ISDN_DEBUG_MODEM_OPEN
 	printk(KERN_DEBUG "isdn_tty_open %s, count = %d\n", tty->name,
 	       port->count);
 #endif
 	port->count++;
 	port->tty = tty;
 	/*
 	 * Start up serial port
 	 */
 	retval = isdn_tty_startup(info);
 	if (retval) {
 #ifdef ISDN_DEBUG_MODEM_OPEN
 		printk(KERN_DEBUG "isdn_tty_open return after startup\n");
 #endif
 		return retval;
 	}
 	retval = tty_port_block_til_ready(port, tty, filp);
 	if (retval) {
 #ifdef ISDN_DEBUG_MODEM_OPEN
 		printk(KERN_DEBUG "isdn_tty_open return after isdn_tty_block_til_ready \n");
 #endif
 		return retval;
 	}
 #ifdef ISDN_DEBUG_MODEM_OPEN
 	printk(KERN_DEBUG "isdn_tty_open ttyi%d successful...\n", info->line);
 #endif
 	dev->modempoll++;
 #ifdef ISDN_DEBUG_MODEM_OPEN
 	printk(KERN_DEBUG "isdn_tty_open normal exit\n");
 #endif
 	return 0;
 }

 static void
 isdn_tty_close(struct tty_struct *tty, struct file *filp)
 {
 	modem_info *info = (modem_info *) tty->driver_data;
 	struct tty_port *port = &info->port;
 	ulong timeout;

 	if (!info || isdn_tty_paranoia_check(info, tty->name, "isdn_tty_close"))
 		return;
 	if (tty_hung_up_p(filp)) {
 #ifdef ISDN_DEBUG_MODEM_OPEN
 		printk(KERN_DEBUG "isdn_tty_close return after tty_hung_up_p\n");
 #endif
 		return;
 	}
 	if ((tty->count == 1) && (port->count != 1)) {
 		/*
 		 * Uh, oh.  tty->count is 1, which means that the tty
 		 * structure will be freed.  Info->count should always
 		 * be one in these conditions.  If it's greater than
 		 * one, we've got real problems, since it means the
 		 * serial port won't be shutdown.
 		 */
 		printk(KERN_ERR "isdn_tty_close: bad port count; tty->count is 1, "
 		       "info->count is %d\n", port->count);
 		port->count = 1;
 	}
 	if (--port->count < 0) {
 		printk(KERN_ERR "isdn_tty_close: bad port count for ttyi%d: %d\n",
 		       info->line, port->count);
 		port->count = 0;
 	}
 	if (port->count) {
 #ifdef ISDN_DEBUG_MODEM_OPEN
 		printk(KERN_DEBUG "isdn_tty_close after info->count != 0\n");
 #endif
 		return;
 	}
 	info->closing = 1;

 	tty->closing = 1;
 	/*
 	 * At this point we stop accepting input.  To do this, we
 	 * disable the receive line status interrupts, and tell the
 	 * interrupt driver to stop checking the data ready bit in the
 	 * line status register.
 	 */
 	if (tty_port_initialized(port)) {
 		tty_wait_until_sent(tty, 3000);	/* 30 seconds timeout */
 		/*
 		 * Before we drop DTR, make sure the UART transmitter
 		 * has completely drained; this is especially
 		 * important if there is a transmit FIFO!
 		 */
 		timeout = jiffies + HZ;
 		while (!(info->lsr & UART_LSR_TEMT)) {
 			schedule_timeout_interruptible(20);
 			if (time_after(jiffies, timeout))
 				break;
 		}
 	}
 	dev->modempoll--;
 	isdn_tty_shutdown(info);
 	isdn_tty_flush_buffer(tty);
 	tty_ldisc_flush(tty);
 	port->tty = NULL;
 	info->ncarrier = 0;

 	tty_port_close_end(port, tty);
 	info->closing = 0;
 #ifdef ISDN_DEBUG_MODEM_OPEN
 	printk(KERN_DEBUG "isdn_tty_close normal exit\n");
 #endif
 }

 /*
  * isdn_tty_hangup() --- called by tty_hangup() when a hangup is signaled.
  */
 static void
 isdn_tty_hangup(struct tty_struct *tty)
 {
 	modem_info *info = (modem_info *) tty->driver_data;
 	struct tty_port *port = &info->port;

 	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_hangup"))
 		return;
 	isdn_tty_shutdown(info);
 	port->count = 0;
 	tty_port_set_active(port, 0);
 	port->tty = NULL;
 	wake_up_interruptible(&port->open_wait);
 }

 /* This routine initializes all emulator-data.
  */
 static void
 isdn_tty_reset_profile(atemu *m)
 {
 	m->profile[0] = 0;
 	m->profile[1] = 0;
 	m->profile[2] = 43;
 	m->profile[3] = 13;
 	m->profile[4] = 10;
 	m->profile[5] = 8;
 	m->profile[6] = 3;
 	m->profile[7] = 60;
 	m->profile[8] = 2;
 	m->profile[9] = 6;
 	m->profile[10] = 7;
 	m->profile[11] = 70;
 	m->profile[12] = 0x45;
 	m->profile[13] = 4;
 	m->profile[14] = ISDN_PROTO_L2_X75I;
 	m->profile[15] = ISDN_PROTO_L3_TRANS;
 	m->profile[16] = ISDN_SERIAL_XMIT_SIZE / 16;
 	m->profile[17] = ISDN_MODEM_WINSIZE;
 	m->profile[18] = 4;
 	m->profile[19] = 0;
 	m->profile[20] = 0;
 	m->profile[23] = 0;
 	m->pmsn[0] = '\0';
 	m->plmsn[0] = '\0';
 }

 #ifdef CONFIG_ISDN_AUDIO
 static void
 isdn_tty_modem_reset_vpar(atemu *m)
 {
 	m->vpar[0] = 2;         /* Voice-device            (2 = phone line) */
 	m->vpar[1] = 0;         /* Silence detection level (0 = none      ) */
 	m->vpar[2] = 70;        /* Silence interval        (7 sec.        ) */
 	m->vpar[3] = 2;         /* Compression type        (1 = ADPCM-2   ) */
 	m->vpar[4] = 0;         /* DTMF detection level    (0 = softcode  ) */
 	m->vpar[5] = 8;         /* DTMF interval           (8 * 5 ms.     ) */
 }
 #endif

 #ifdef CONFIG_ISDN_TTY_FAX
 static void
 isdn_tty_modem_reset_faxpar(modem_info *info)
 {
 	T30_s *f = info->fax;

 	f->code = 0;
 	f->phase = ISDN_FAX_PHASE_IDLE;
 	f->direction = 0;
 	f->resolution = 1;	/* fine */
 	f->rate = 5;		/* 14400 bit/s */
 	f->width = 0;
 	f->length = 0;
 	f->compression = 0;
 	f->ecm = 0;
 	f->binary = 0;
 	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);
 }

 static const struct tty_operations modem_ops = {
 	.install = isdn_tty_install,
 	.open = isdn_tty_open,
 	.close = isdn_tty_close,
 	.write = isdn_tty_write,
 	.flush_chars = isdn_tty_flush_chars,
 	.write_room = isdn_tty_write_room,
 	.chars_in_buffer = isdn_tty_chars_in_buffer,
 	.flush_buffer = isdn_tty_flush_buffer,
 	.ioctl = isdn_tty_ioctl,
 	.throttle = isdn_tty_throttle,
 	.unthrottle = isdn_tty_unthrottle,
 	.set_termios = isdn_tty_set_termios,
 	.hangup = isdn_tty_hangup,
 	.tiocmget = isdn_tty_tiocmget,
 	.tiocmset = isdn_tty_tiocmset,
 };

 static int isdn_tty_carrier_raised(struct tty_port *port)
 {
 	modem_info *info = container_of(port, modem_info, port);
 	return info->msr & UART_MSR_DCD;
 }

 static const struct tty_port_operations isdn_tty_port_ops = {
 	.carrier_raised = isdn_tty_carrier_raised,
 };

 int
 isdn_tty_modem_init(void)
 {
 	isdn_modem_t	*m;
 	int		i, retval;
 	modem_info	*info;

 	m = &dev->mdm;
 	m->tty_modem = alloc_tty_driver(ISDN_MAX_CHANNELS);
 	if (!m->tty_modem)
 		return -ENOMEM;
 	m->tty_modem->name = "ttyI";
 	m->tty_modem->major = ISDN_TTY_MAJOR;
 	m->tty_modem->minor_start = 0;
 	m->tty_modem->type = TTY_DRIVER_TYPE_SERIAL;
 	m->tty_modem->subtype = 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->driver_name = "isdn_tty";
 	tty_set_operations(m->tty_modem, &modem_ops);
 	retval = tty_register_driver(m->tty_modem);
 	if (retval) {
 		printk(KERN_WARNING "isdn_tty: Couldn't register modem-device\n");
 		goto err;
 	}
 	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");
 			retval = -ENOMEM;
 			goto err_unregister;
 		}
 #endif
 		tty_port_init(&info->port);
 		info->port.ops = &isdn_tty_port_ops;
 		spin_lock_init(&info->readlock);
 		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->x_char = 0;
 		info->isdn_driver = -1;
 		info->isdn_channel = -1;
 		info->drv_index = -1;
 		info->xmit_size = ISDN_SERIAL_XMIT_SIZE;
 		init_timer(&info->nc_timer);
 		info->nc_timer.function = isdn_tty_modem_do_ncarrier;
 		info->nc_timer.data = (unsigned long) info;
 		skb_queue_head_init(&info->xmit_queue);
 #ifdef CONFIG_ISDN_AUDIO
 		skb_queue_head_init(&info->dtmf_queue);
 #endif
 		info->port.xmit_buf = kmalloc(ISDN_SERIAL_XMIT_MAX + 5,
 				GFP_KERNEL);
 		if (!info->port.xmit_buf) {
 			printk(KERN_ERR "Could not allocate modem xmit-buffer\n");
 			retval = -ENOMEM;
 			goto err_unregister;
 		}
 		/* Make room for T.70 header */
 		info->port.xmit_buf += 4;
 	}
 	return 0;
 err_unregister:
 	for (i--; i >= 0; i--) {
 		info = &m->info[i];
 #ifdef CONFIG_ISDN_TTY_FAX
 		kfree(info->fax);
 #endif
 		kfree(info->port.xmit_buf - 4);
 		info->port.xmit_buf = NULL;
 		tty_port_destroy(&info->port);
 	}
 	tty_unregister_driver(m->tty_modem);
 err:
 	put_tty_driver(m->tty_modem);
 	m->tty_modem = NULL;
 	return retval;
 }

 void
 isdn_tty_exit(void)
 {
 	modem_info *info;
 	int i;

 	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
 		info = &dev->mdm.info[i];
 		isdn_tty_cleanup_xmit(info);
 #ifdef CONFIG_ISDN_TTY_FAX
 		kfree(info->fax);
 #endif
 		kfree(info->port.xmit_buf - 4);
 		info->port.xmit_buf = NULL;
 		tty_port_destroy(&info->port);
 	}
 	tty_unregister_driver(dev->mdm.tty_modem);
 	put_tty_driver(dev->mdm.tty_modem);
 	dev->mdm.tty_modem = NULL;
 }


 /*
  * 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;
 	spin_lock_irqsave(&dev->lock, flags);
 	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
 		modem_info *info = &dev->mdm.info[i];

 		if (info->port.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->port.flags, info->isdn_driver,
 			       info->isdn_channel, dev->usage[idx]);
 #endif
 			if (
 #ifndef FIX_FILE_TRANSFER
 			    tty_port_active(&info->port) &&
 #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();
 					spin_unlock_irqrestore(&dev->lock, 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;
 				}
 			}
 		}
 	}
 	spin_unlock_irqrestore(&dev->lock, 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;
 }

 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_port_active(&info->port)) {
 				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_port_active(&info->port)) {
 				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->port.blocked_open &&
 			    (info->emu.mdmreg[REG_DCD] & BIT_DCD)) {
 				wake_up_interruptible(&info->port.open_wait);
 			}

 			/* Schedule CONNECT-Message to any tty
 			 * waiting for it and
 			 * set DCD-bit of its modem-status.
 			 */
 			if (tty_port_active(&info->port) ||
 			    (info->port.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_port_active(&info->port)) {
 #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_port_active(&info->port)) {
 				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_port_active(&info->port)) {
 				isdn_tty_fax_command(info, c);
 			}
 			break;
 #endif
 #ifdef CONFIG_ISDN_AUDIO
 		case ISDN_STAT_AUDIO:
 			if (tty_port_active(&info->port)) {
 				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 in modem-registers 3, 4 and 5.
  */
 void
 isdn_tty_at_cout(char *msg, modem_info *info)
 {
 	struct tty_port *port = &info->port;
 	atemu *m = &info->emu;
 	char *p;
 	char c;
 	u_long flags;
 	struct sk_buff *skb = NULL;
 	char *sp = NULL;
 	int l;

 	if (!msg) {
 		printk(KERN_WARNING "isdn_tty: Null-Message in isdn_tty_at_cout\n");
 		return;
 	}

 	l = strlen(msg);

 	spin_lock_irqsave(&info->readlock, flags);
 	if (info->closing) {
 		spin_unlock_irqrestore(&info->readlock, flags);
 		return;
 	}

 	/* use queue instead of direct, if online and */
 	/* data is in queue or buffer is full */
 	if (info->online && ((tty_buffer_request_room(port, l) < l) ||
 			     !skb_queue_empty(&dev->drv[info->isdn_driver]->rpqueue[info->isdn_channel]))) {
 		skb = alloc_skb(l, GFP_ATOMIC);
 		if (!skb) {
 			spin_unlock_irqrestore(&info->readlock, flags);
 			return;
 		}
 		sp = skb_put(skb, l);
 #ifdef CONFIG_ISDN_AUDIO
 		ISDN_AUDIO_SKB_DLECOUNT(skb) = 0;
 		ISDN_AUDIO_SKB_LOCK(skb) = 0;
 #endif
 	}

 	for (p = msg; *p; p++) {
 		switch (*p) {
 		case '\r':
 			c = m->mdmreg[REG_CR];
 			break;
 		case '\n':
 			c = m->mdmreg[REG_LF];
 			break;
 		case '\b':
 			c = m->mdmreg[REG_BS];
 			break;
 		default:
 			c = *p;
 		}
 		if (skb) {
 			*sp++ = c;
 		} else {
 			if (tty_insert_flip_char(port, c, TTY_NORMAL) == 0)
 				break;
 		}
 	}
 	if (skb) {
 		__skb_queue_tail(&dev->drv[info->isdn_driver]->rpqueue[info->isdn_channel], skb);
 		dev->drv[info->isdn_driver]->rcvcount[info->isdn_channel] += skb->len;
 		spin_unlock_irqrestore(&info->readlock, flags);
 		/* Schedule dequeuing */
 		if (dev->modempoll && info->rcvsched)
 			isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 1);

 	} else {
 		spin_unlock_irqrestore(&info->readlock, flags);
 		tty_flip_buffer_push(port);
 	}
 }

 /*
  * Perform ATH Hangup
  */
 static void
 isdn_tty_on_hook(modem_info *info)
 {
 	if (info->isdn_channel >= 0) {
 #ifdef ISDN_DEBUG_MODEM_HUP
 		printk(KERN_DEBUG "Mhup in isdn_tty_on_hook\n");
 #endif
 		isdn_tty_modem_hup(info, 1);
 	}
 }

 static void
 isdn_tty_off_hook(void)
 {
 	printk(KERN_DEBUG "isdn_tty_off_hook\n");
 }

 #define PLUSWAIT1 (HZ / 2)      /* 0.5 sec. */
 #define PLUSWAIT2 (HZ * 3 / 2)  /* 1.5 sec */

 /*
  * Check Buffer for Modem-escape-sequence, activate timer-callback to
  * isdn_tty_modem_escape() if sequence found.
  *
  * Parameters:
  *   p          pointer to databuffer
  *   plus       escape-character
  *   count      length of buffer
  *   pluscount  count of valid escape-characters so far
  *   lastplus   timestamp of last character
  */
 static void
 isdn_tty_check_esc(const u_char *p, u_char plus, int count, int *pluscount,
 		   u_long *lastplus)
 {
 	if (plus > 127)
 		return;
 	if (count > 3) {
 		p += count - 3;
 		count = 3;
 		*pluscount = 0;
 	}
 	while (count > 0) {
 		if (*(p++) == plus) {
 			if ((*pluscount)++) {
 				/* Time since last '+' > 0.5 sec. ? */
 				if (time_after(jiffies, *lastplus + PLUSWAIT1))
 					*pluscount = 1;
 			} else {
 				/* Time since last non-'+' < 1.5 sec. ? */
 				if (time_before(jiffies, *lastplus + PLUSWAIT2))
 					*pluscount = 0;
 			}
 			if ((*pluscount == 3) && (count == 1))
 				isdn_timer_ctrl(ISDN_TIMER_MODEMPLUS, 1);
 			if (*pluscount > 3)
 				*pluscount = 1;
 		} else
 			*pluscount = 0;
 		*lastplus = jiffies;
 		count--;
 	}
 }

 /*
  * Return result of AT-emulator to tty-receive-buffer, depending on
  * modem-register 12, bit 0 and 1.
  * For CONNECT-messages also switch to online-mode.
  * For RING-message handle auto-ATA if register 0 != 0
  */

 static void
 isdn_tty_modem_result(int code, modem_info *info)
 {
 	atemu *m = &info->emu;
 	static char *msg[] =
 		{"OK", "CONNECT", "RING", "NO CARRIER", "ERROR",
 		 "CONNECT 64000", "NO DIALTONE", "BUSY", "NO ANSWER",
 		 "RINGING", "NO MSN/EAZ", "VCON", "RUNG"};
 	char s[ISDN_MSNLEN + 10];

 	switch (code) {
 	case RESULT_RING:
 		m->mdmreg[REG_RINGCNT]++;
 		if (m->mdmreg[REG_RINGCNT] == m->mdmreg[REG_RINGATA])
 			/* Automatically accept incoming call */
 			isdn_tty_cmd_ATA(info);
 		break;
 	case RESULT_NO_CARRIER:
 #ifdef ISDN_DEBUG_MODEM_HUP
 		printk(KERN_DEBUG "modem_result: NO CARRIER %d %d\n",
 		       info->closing, !info->port.tty);
 #endif
 		m->mdmreg[REG_RINGCNT] = 0;
 		del_timer(&info->nc_timer);
 		info->ncarrier = 0;
 		if (info->closing || !info->port.tty)
 			return;

 #ifdef CONFIG_ISDN_AUDIO
 		if (info->vonline & 1) {
 #ifdef ISDN_DEBUG_MODEM_VOICE
 			printk(KERN_DEBUG "res3: send DLE-ETX on ttyI%d\n",
 			       info->line);
 #endif
 			/* voice-recording, add DLE-ETX */
 			isdn_tty_at_cout("\020\003", info);
 		}
 		if (info->vonline & 2) {
 #ifdef ISDN_DEBUG_MODEM_VOICE
 			printk(KERN_DEBUG "res3: send DLE-DC4 on ttyI%d\n",
 			       info->line);
 #endif
 			/* voice-playing, add DLE-DC4 */
 			isdn_tty_at_cout("\020\024", info);
 		}
 #endif
 		break;
 	case RESULT_CONNECT:
 	case RESULT_CONNECT64000:
 		sprintf(info->last_cause, "0000");
 		if (!info->online)
 			info->online = 2;
 		break;
 	case RESULT_VCON:
 #ifdef ISDN_DEBUG_MODEM_VOICE
 		printk(KERN_DEBUG "res3: send VCON on ttyI%d\n",
 		       info->line);
 #endif
 		sprintf(info->last_cause, "0000");
 		if (!info->online)
 			info->online = 1;
 		break;
 	} /* switch (code) */

 	if (m->mdmreg[REG_RESP] & BIT_RESP) {
 		/* Show results */
 		if (m->mdmreg[REG_RESPNUM] & BIT_RESPNUM) {
 			/* Show numeric results only */
 			sprintf(s, "\r\n%d\r\n", code);
 			isdn_tty_at_cout(s, info);
 		} else {
 			if (code == RESULT_RING) {
 				/* return if "show RUNG" and ringcounter>1 */
 				if ((m->mdmreg[REG_RUNG] & BIT_RUNG) &&
 				    (m->mdmreg[REG_RINGCNT] > 1))
 					return;
 				/* print CID, _before_ _every_ ring */
 				if (!(m->mdmreg[REG_CIDONCE] & BIT_CIDONCE)) {
 					isdn_tty_at_cout("\r\nCALLER NUMBER: ", info);
 					isdn_tty_at_cout(dev->num[info->drv_index], info);
 					if (m->mdmreg[REG_CDN] & BIT_CDN) {
 						isdn_tty_at_cout("\r\nCALLED NUMBER: ", info);
 						isdn_tty_at_cout(info->emu.cpn, info);
 					}
 				}
 			}
 			isdn_tty_at_cout("\r\n", info);
 			isdn_tty_at_cout(msg[code], info);
 			switch (code) {
 			case RESULT_CONNECT:
 				switch (m->mdmreg[REG_L2PROT]) {
 				case ISDN_PROTO_L2_MODEM:
 					isdn_tty_at_cout(" ", info);
 					isdn_tty_at_cout(m->connmsg, info);
 					break;
 				}
 				break;
 			case RESULT_RING:
 				/* Append CPN, if enabled */
 				if ((m->mdmreg[REG_CPN] & BIT_CPN)) {
 					sprintf(s, "/%s", m->cpn);
 					isdn_tty_at_cout(s, info);
 				}
 				/* Print CID only once, _after_ 1st RING */
 				if ((m->mdmreg[REG_CIDONCE] & BIT_CIDONCE) &&
 				    (m->mdmreg[REG_RINGCNT] == 1)) {
 					isdn_tty_at_cout("\r\n", info);
 					isdn_tty_at_cout("CALLER NUMBER: ", info);
 					isdn_tty_at_cout(dev->num[info->drv_index], info);
 					if (m->mdmreg[REG_CDN] & BIT_CDN) {
 						isdn_tty_at_cout("\r\nCALLED NUMBER: ", info);
 						isdn_tty_at_cout(info->emu.cpn, info);
 					}
 				}
 				break;
 			case RESULT_NO_CARRIER:
 			case RESULT_NO_DIALTONE:
 			case RESULT_BUSY:
 			case RESULT_NO_ANSWER:
 				m->mdmreg[REG_RINGCNT] = 0;
 				/* Append Cause-Message if enabled */
 				if (m->mdmreg[REG_RESPXT] & BIT_RESPXT) {
 					sprintf(s, "/%s", info->last_cause);
 					isdn_tty_at_cout(s, info);
 				}
 				break;
 			case RESULT_CONNECT64000:
 				/* Append Protocol to CONNECT message */
 				switch (m->mdmreg[REG_L2PROT]) {
 				case ISDN_PROTO_L2_X75I:
 				case ISDN_PROTO_L2_X75UI:
 				case ISDN_PROTO_L2_X75BUI:
 					isdn_tty_at_cout("/X.75", info);
 					break;
 				case ISDN_PROTO_L2_HDLC:
 					isdn_tty_at_cout("/HDLC", info);
 					break;
 				case ISDN_PROTO_L2_V11096:
 					isdn_tty_at_cout("/V110/9600", info);
 					break;
 				case ISDN_PROTO_L2_V11019:
 					isdn_tty_at_cout("/V110/19200", info);
 					break;
 				case ISDN_PROTO_L2_V11038:
 					isdn_tty_at_cout("/V110/38400", info);
 					break;
 				}
 				if (m->mdmreg[REG_T70] & BIT_T70) {
 					isdn_tty_at_cout("/T.70", info);
 					if (m->mdmreg[REG_T70] & BIT_T70_EXT)
 						isdn_tty_at_cout("+", info);
 				}
 				break;
 			}
 			isdn_tty_at_cout("\r\n", info);
 		}
 	}
 	if (code == RESULT_NO_CARRIER) {
 		if (info->closing || (!info->port.tty))
 			return;

 		if (tty_port_check_carrier(&info->port))
 			tty_hangup(info->port.tty);
 	}
 }


 /*
  * Display a modem-register-value.
  */
 static void
 isdn_tty_show_profile(int ridx, modem_info *info)
 {
 	char v[6];

 	sprintf(v, "\r\n%d", info->emu.mdmreg[ridx]);
 	isdn_tty_at_cout(v, info);
 }

 /*
  * Get MSN-string from char-pointer, set pointer to end of number
  */
 static void
 isdn_tty_get_msnstr(char *n, char **p)
 {
 	int limit = ISDN_MSNLEN - 1;

 	while (((*p[0] >= '0' && *p[0] <= '9') ||
 		/* Why a comma ??? */
 		(*p[0] == ',') || (*p[0] == ':')) &&
 	       (limit--))
 		*n++ = *p[0]++;
 	*n = '\0';
 }

 /*
  * Get phone-number from modem-commandbuffer
  */
 static void
 isdn_tty_getdial(char *p, char *q, int cnt)
 {
 	int first = 1;
 	int limit = ISDN_MSNLEN - 1;	/* MUST match the size of interface var to avoid
 					   buffer overflow */

 	while (strchr(" 0123456789,#.*WPTSR-", *p) && *p && --cnt > 0) {
 		if ((*p >= '0' && *p <= '9') || ((*p == 'S') && first) ||
 		    ((*p == 'R') && first) ||
 		    (*p == '*') || (*p == '#')) {
 			*q++ = *p;
 			limit--;
 		}
 		if (!limit)
 			break;
 		p++;
 		first = 0;
 	}
 	*q = 0;
 }

 #define PARSE_ERROR { isdn_tty_modem_result(RESULT_ERROR, info); return; }
 #define PARSE_ERROR1 { isdn_tty_modem_result(RESULT_ERROR, info); return 1; }

 static void
 isdn_tty_report(modem_info *info)
 {
 	atemu *m = &info->emu;
 	char s[80];

 	isdn_tty_at_cout("\r\nStatistics of last connection:\r\n\r\n", info);
 	sprintf(s, "    Remote Number:    %s\r\n", info->last_num);
 	isdn_tty_at_cout(s, info);
 	sprintf(s, "    Direction:        %s\r\n", info->last_dir ? "outgoing" : "incoming");
 	isdn_tty_at_cout(s, info);
 	isdn_tty_at_cout("    Layer-2 Protocol: ", info);
 	switch (info->last_l2) {
 	case ISDN_PROTO_L2_X75I:
 		isdn_tty_at_cout("X.75i", info);
 		break;
 	case ISDN_PROTO_L2_X75UI:
 		isdn_tty_at_cout("X.75ui", info);
 		break;
 	case ISDN_PROTO_L2_X75BUI:
 		isdn_tty_at_cout("X.75bui", info);
 		break;
 	case ISDN_PROTO_L2_HDLC:
 		isdn_tty_at_cout("HDLC", info);
 		break;
 	case ISDN_PROTO_L2_V11096:
 		isdn_tty_at_cout("V.110 9600 Baud", info);
 		break;
 	case ISDN_PROTO_L2_V11019:
 		isdn_tty_at_cout("V.110 19200 Baud", info);
 		break;
 	case ISDN_PROTO_L2_V11038:
 		isdn_tty_at_cout("V.110 38400 Baud", info);
 		break;
 	case ISDN_PROTO_L2_TRANS:
 		isdn_tty_at_cout("transparent", info);
 		break;
 	case ISDN_PROTO_L2_MODEM:
 		isdn_tty_at_cout("modem", info);
 		break;
 	case ISDN_PROTO_L2_FAX:
 		isdn_tty_at_cout("fax", info);
 		break;
 	default:
 		isdn_tty_at_cout("unknown", info);
 		break;
 	}
 	if (m->mdmreg[REG_T70] & BIT_T70) {
 		isdn_tty_at_cout("/T.70", info);
 		if (m->mdmreg[REG_T70] & BIT_T70_EXT)
 			isdn_tty_at_cout("+", info);
 	}
 	isdn_tty_at_cout("\r\n", info);
 	isdn_tty_at_cout("    Service:          ", info);
 	switch (info->last_si) {
 	case 1:
 		isdn_tty_at_cout("audio\r\n", info);
 		break;
 	case 5:
 		isdn_tty_at_cout("btx\r\n", info);
 		break;
 	case 7:
 		isdn_tty_at_cout("data\r\n", info);
 		break;
 	default:
 		sprintf(s, "%d\r\n", info->last_si);
 		isdn_tty_at_cout(s, info);
 		break;
 	}
 	sprintf(s, "    Hangup location:  %s\r\n", info->last_lhup ? "local" : "remote");
 	isdn_tty_at_cout(s, info);
 	sprintf(s, "    Last cause:       %s\r\n", info->last_cause);
 	isdn_tty_at_cout(s, info);
 }

 /*
  * Parse AT&.. commands.
  */
 static int
 isdn_tty_cmd_ATand(char **p, modem_info *info)
 {
 	atemu *m = &info->emu;
 	int i;
 	char rb[100];

 #define MAXRB (sizeof(rb) - 1)

 	switch (*p[0]) {
 	case 'B':
 		/* &B - Set Buffersize */
 		p[0]++;
 		i = isdn_getnum(p);
 		if ((i < 0) || (i > ISDN_SERIAL_XMIT_MAX))
 			PARSE_ERROR1;
 #ifdef CONFIG_ISDN_AUDIO
 		if ((m->mdmreg[REG_SI1] & 1) && (i > VBUF))
 			PARSE_ERROR1;
 #endif
 		m->mdmreg[REG_PSIZE] = i / 16;
 		info->xmit_size = m->mdmreg[REG_PSIZE] * 16;
 		switch (m->mdmreg[REG_L2PROT]) {
 		case ISDN_PROTO_L2_V11096:
 		case ISDN_PROTO_L2_V11019:
 		case ISDN_PROTO_L2_V11038:
 			info->xmit_size /= 10;
 		}
 		break;
 	case 'C':
 		/* &C - DCD Status */
 		p[0]++;
 		switch (isdn_getnum(p)) {
 		case 0:
 			m->mdmreg[REG_DCD] &= ~BIT_DCD;
 			break;
 		case 1:
 			m->mdmreg[REG_DCD] |= BIT_DCD;
 			break;
 		default:
 			PARSE_ERROR1
 				}
 		break;
 	case 'D':
 		/* &D - Set DTR-Low-behavior */
 		p[0]++;
 		switch (isdn_getnum(p)) {
 		case 0:
 			m->mdmreg[REG_DTRHUP] &= ~BIT_DTRHUP;
 			m->mdmreg[REG_DTRR] &= ~BIT_DTRR;
 			break;
 		case 2:
 			m->mdmreg[REG_DTRHUP] |= BIT_DTRHUP;
 			m->mdmreg[REG_DTRR] &= ~BIT_DTRR;
 			break;
 		case 3:
 			m->mdmreg[REG_DTRHUP] |= BIT_DTRHUP;
 			m->mdmreg[REG_DTRR] |= BIT_DTRR;
 			break;
 		default:
 			PARSE_ERROR1
 				}
 		break;
 	case 'E':
 		/* &E -Set EAZ/MSN */
 		p[0]++;
 		isdn_tty_get_msnstr(m->msn, p);
 		break;
 	case 'F':
 		/* &F -Set Factory-Defaults */
 		p[0]++;
 		if (info->msr & UART_MSR_DCD)
 			PARSE_ERROR1;
 		isdn_tty_reset_profile(m);
 		isdn_tty_modem_reset_regs(info, 1);
 		break;
 #ifdef DUMMY_HAYES_AT
 	case 'K':
 		/* only for be compilant with common scripts */
 		/* &K Flowcontrol - no function */
 		p[0]++;
 		isdn_getnum(p);
 		break;
 #endif
 	case 'L':
 		/* &L -Set Numbers to listen on */
 		p[0]++;
 		i = 0;
 		while (*p[0] && (strchr("0123456789,-*[]?;", *p[0])) &&
 		       (i < ISDN_LMSNLEN - 1))
 			m->lmsn[i++] = *p[0]++;
 		m->lmsn[i] = '\0';
 		break;
 	case 'R':
 		/* &R - Set V.110 bitrate adaption */
 		p[0]++;
 		i = isdn_getnum(p);
 		switch (i) {
 		case 0:
 			/* Switch off V.110, back to X.75 */
 			m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
 			m->mdmreg[REG_SI2] = 0;
 			info->xmit_size = m->mdmreg[REG_PSIZE] * 16;
 			break;
 		case 9600:
 			m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_V11096;
 			m->mdmreg[REG_SI2] = 197;
 			info->xmit_size = m->mdmreg[REG_PSIZE] * 16 / 10;
 			break;
 		case 19200:
 			m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_V11019;
 			m->mdmreg[REG_SI2] = 199;
 			info->xmit_size = m->mdmreg[REG_PSIZE] * 16 / 10;
 			break;
 		case 38400:
 			m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_V11038;
 			m->mdmreg[REG_SI2] = 198; /* no existing standard for this */
 			info->xmit_size = m->mdmreg[REG_PSIZE] * 16 / 10;
 			break;
 		default:
 			PARSE_ERROR1;
 		}
 		/* Switch off T.70 */
 		m->mdmreg[REG_T70] &= ~(BIT_T70 | BIT_T70_EXT);
 		/* Set Service 7 */
 		m->mdmreg[REG_SI1] |= 4;
 		break;
 	case 'S':
 		/* &S - Set Windowsize */
 		p[0]++;
 		i = isdn_getnum(p);
 		if ((i > 0) && (i < 9))
 			m->mdmreg[REG_WSIZE] = i;
 		else
 			PARSE_ERROR1;
 		break;
 	case 'V':
 		/* &V - Show registers */
 		p[0]++;
 		isdn_tty_at_cout("\r\n", info);
 		for (i = 0; i < ISDN_MODEM_NUMREG; i++) {
 			sprintf(rb, "S%02d=%03d%s", i,
 				m->mdmreg[i], ((i + 1) % 10) ? " " : "\r\n");
 			isdn_tty_at_cout(rb, info);
 		}
 		sprintf(rb, "\r\nEAZ/MSN: %.50s\r\n",
 			strlen(m->msn) ? m->msn : "None");
 		isdn_tty_at_cout(rb, info);
 		if (strlen(m->lmsn)) {
 			isdn_tty_at_cout("\r\nListen: ", info);
 			isdn_tty_at_cout(m->lmsn, info);
 			isdn_tty_at_cout("\r\n", info);
 		}
 		break;
 	case 'W':
 		/* &W - Write Profile */
 		p[0]++;
 		switch (*p[0]) {
 		case '0':
 			p[0]++;
 			modem_write_profile(m);
 			break;
 		default:
 			PARSE_ERROR1;
 		}
 		break;
 	case 'X':
 		/* &X - Switch to BTX-Mode and T.70 */
 		p[0]++;
 		switch (isdn_getnum(p)) {
 		case 0:
 			m->mdmreg[REG_T70] &= ~(BIT_T70 | BIT_T70_EXT);
 			info->xmit_size = m->mdmreg[REG_PSIZE] * 16;
 			break;
 		case 1:
 			m->mdmreg[REG_T70] |= BIT_T70;
 			m->mdmreg[REG_T70] &= ~BIT_T70_EXT;
 			m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
 			info->xmit_size = 112;
 			m->mdmreg[REG_SI1] = 4;
 			m->mdmreg[REG_SI2] = 0;
 			break;
 		case 2:
 			m->mdmreg[REG_T70] |= (BIT_T70 | BIT_T70_EXT);
 			m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
 			info->xmit_size = 112;
 			m->mdmreg[REG_SI1] = 4;
 			m->mdmreg[REG_SI2] = 0;
 			break;
 		default:
 			PARSE_ERROR1;
 		}
 		break;
 	default:
 		PARSE_ERROR1;
 	}
 	return 0;
 }

 static int
 isdn_tty_check_ats(int mreg, int mval, modem_info *info, atemu *m)
 {
 	/* Some plausibility checks */
 	switch (mreg) {
 	case REG_L2PROT:
 		if (mval > ISDN_PROTO_L2_MAX)
 			return 1;
 		break;
 	case REG_PSIZE:
 		if ((mval * 16) > ISDN_SERIAL_XMIT_MAX)
 			return 1;
 #ifdef CONFIG_ISDN_AUDIO
 		if ((m->mdmreg[REG_SI1] & 1) && (mval > VBUFX))
 			return 1;
 #endif
 		info->xmit_size = mval * 16;
 		switch (m->mdmreg[REG_L2PROT]) {
 		case ISDN_PROTO_L2_V11096:
 		case ISDN_PROTO_L2_V11019:
 		case ISDN_PROTO_L2_V11038:
 			info->xmit_size /= 10;
 		}
 		break;
 	case REG_SI1I:
 	case REG_PLAN:
 	case REG_SCREEN:
 		/* readonly registers */
 		return 1;
 	}
 	return 0;
 }

 /*
  * Perform ATS command
  */
 static int
 isdn_tty_cmd_ATS(char **p, modem_info *info)
 {
 	atemu *m = &info->emu;
 	int bitpos;
 	int mreg;
 	int mval;
 	int bval;

 	mreg = isdn_getnum(p);
 	if (mreg < 0 || mreg >= ISDN_MODEM_NUMREG)
 		PARSE_ERROR1;
 	switch (*p[0]) {
 	case '=':
 		p[0]++;
 		mval = isdn_getnum(p);
 		if (mval < 0 || mval > 255)
 			PARSE_ERROR1;
 		if (isdn_tty_check_ats(mreg, mval, info, m))
 			PARSE_ERROR1;
 		m->mdmreg[mreg] = mval;
 		break;
 	case '.':
 		/* Set/Clear a single bit */
 		p[0]++;
 		bitpos = isdn_getnum(p);
 		if ((bitpos < 0) || (bitpos > 7))
 			PARSE_ERROR1;
 		switch (*p[0]) {
 		case '=':
 			p[0]++;
 			bval = isdn_getnum(p);
 			if (bval < 0 || bval > 1)
 				PARSE_ERROR1;
 			if (bval)
 				mval = m->mdmreg[mreg] | (1 << bitpos);
 			else
 				mval = m->mdmreg[mreg] & ~(1 << bitpos);
 			if (isdn_tty_check_ats(mreg, mval, info, m))
 				PARSE_ERROR1;
 			m->mdmreg[mreg] = mval;
 			break;
 		case '?':
 			p[0]++;
 			isdn_tty_at_cout("\r\n", info);
 			isdn_tty_at_cout((m->mdmreg[mreg] & (1 << bitpos)) ? "1" : "0",
 					 info);
 			break;
 		default:
 			PARSE_ERROR1;
 		}
 		break;
 	case '?':
 		p[0]++;
 		isdn_tty_show_profile(mreg, info);
 		break;
 	default:
 		PARSE_ERROR1;
 		break;
 	}
 	return 0;
 }

 /*
  * Perform ATA command
  */
 static void
 isdn_tty_cmd_ATA(modem_info *info)
 {
 	atemu *m = &info->emu;
 	isdn_ctrl cmd;
 	int l2;

 	if (info->msr & UART_MSR_RI) {
 		/* Accept incoming call */
 		info->last_dir = 0;
 		strcpy(info->last_num, dev->num[info->drv_index]);
 		m->mdmreg[REG_RINGCNT] = 0;
 		info->msr &= ~UART_MSR_RI;
 		l2 = m->mdmreg[REG_L2PROT];
 #ifdef CONFIG_ISDN_AUDIO
 		/* If more than one bit set in reg18, autoselect Layer2 */
 		if ((m->mdmreg[REG_SI1] & m->mdmreg[REG_SI1I]) != m->mdmreg[REG_SI1]) {
 			if (m->mdmreg[REG_SI1I] == 1) {
 				if ((l2 != ISDN_PROTO_L2_MODEM) && (l2 != ISDN_PROTO_L2_FAX))
 					l2 = ISDN_PROTO_L2_TRANS;
 			} else
 				l2 = ISDN_PROTO_L2_X75I;
 		}
 #endif
 		cmd.driver = info->isdn_driver;
 		cmd.command = ISDN_CMD_SETL2;
 		cmd.arg = info->isdn_channel + (l2 << 8);
 		info->last_l2 = l2;
 		isdn_command(&cmd);
 		cmd.driver = info->isdn_driver;
 		cmd.command = ISDN_CMD_SETL3;
 		cmd.arg = info->isdn_channel + (m->mdmreg[REG_L3PROT] << 8);
 #ifdef CONFIG_ISDN_TTY_FAX
 		if (l2 == ISDN_PROTO_L2_FAX) {
 			cmd.parm.fax = info->fax;
 			info->fax->direction = ISDN_TTY_FAX_CONN_IN;
 		}
 #endif
 		isdn_command(&cmd);
 		cmd.driver = info->isdn_driver;
 		cmd.arg = info->isdn_channel;
 		cmd.command = ISDN_CMD_ACCEPTD;
 		info->dialing = 16;
 		info->emu.carrierwait = 0;
 		isdn_command(&cmd);
 		isdn_timer_ctrl(ISDN_TIMER_CARRIER, 1);
 	} else
 		isdn_tty_modem_result(RESULT_NO_ANSWER, info);
 }

 #ifdef CONFIG_ISDN_AUDIO
 /*
  * Parse AT+F.. commands
  */
 static int
 isdn_tty_cmd_PLUSF(char **p, modem_info *info)
 {
 	atemu *m = &info->emu;
 	char rs[20];

 	if (!strncmp(p[0], "CLASS", 5)) {
 		p[0] += 5;
 		switch (*p[0]) {
 		case '?':
 			p[0]++;
 			sprintf(rs, "\r\n%d",
 				(m->mdmreg[REG_SI1] & 1) ? 8 : 0);
 #ifdef CONFIG_ISDN_TTY_FAX
 			if (TTY_IS_FCLASS2(info))
 				sprintf(rs, "\r\n2");
 			else if (TTY_IS_FCLASS1(info))
 				sprintf(rs, "\r\n1");
 #endif
 			isdn_tty_at_cout(rs, info);
 			break;
 		case '=':
 			p[0]++;
 			switch (*p[0]) {
 			case '0':
 				p[0]++;
 				m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
 				m->mdmreg[REG_L3PROT] = ISDN_PROTO_L3_TRANS;
 				m->mdmreg[REG_SI1] = 4;
 				info->xmit_size =
 					m->mdmreg[REG_PSIZE] * 16;
 				break;
 #ifdef CONFIG_ISDN_TTY_FAX
 			case '1':
 				p[0]++;
 				if (!(dev->global_features &
 				      ISDN_FEATURE_L3_FCLASS1))
 					PARSE_ERROR1;
 				m->mdmreg[REG_SI1] = 1;
 				m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_FAX;
 				m->mdmreg[REG_L3PROT] = ISDN_PROTO_L3_FCLASS1;
 				info->xmit_size =
 					m->mdmreg[REG_PSIZE] * 16;
 				break;
 			case '2':
 				p[0]++;
 				if (!(dev->global_features &
 				      ISDN_FEATURE_L3_FCLASS2))
 					PARSE_ERROR1;
 				m->mdmreg[REG_SI1] = 1;
 				m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_FAX;
 				m->mdmreg[REG_L3PROT] = ISDN_PROTO_L3_FCLASS2;
 				info->xmit_size =
 					m->mdmreg[REG_PSIZE] * 16;
 				break;
 #endif
 			case '8':
 				p[0]++;
 				/* L2 will change on dialout with si=1 */
 				m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
 				m->mdmreg[REG_L3PROT] = ISDN_PROTO_L3_TRANS;
 				m->mdmreg[REG_SI1] = 5;
 				info->xmit_size = VBUF;
 				break;
 			case '?':
 				p[0]++;
 				strcpy(rs, "\r\n0,");
 #ifdef CONFIG_ISDN_TTY_FAX
 				if (dev->global_features &
 				    ISDN_FEATURE_L3_FCLASS1)
 					strcat(rs, "1,");
 				if (dev->global_features &
 				    ISDN_FEATURE_L3_FCLASS2)
 					strcat(rs, "2,");
 #endif
 				strcat(rs, "8");
 				isdn_tty_at_cout(rs, info);
 				break;
 			default:
 				PARSE_ERROR1;
 			}
 			break;
 		default:
 			PARSE_ERROR1;
 		}
 		return 0;
 	}
 #ifdef CONFIG_ISDN_TTY_FAX
 	return (isdn_tty_cmd_PLUSF_FAX(p, info));
 #else
 	PARSE_ERROR1;
 #endif
 }

 /*
  * Parse AT+V.. commands
  */
 static int
 isdn_tty_cmd_PLUSV(char **p, modem_info *info)
 {
 	atemu *m = &info->emu;
 	isdn_ctrl cmd;
 	static char *vcmd[] =
 		{"NH", "IP", "LS", "RX", "SD", "SM", "TX", "DD", NULL};
 	int i;
 	int par1;
 	int par2;
 	char rs[20];

 	i = 0;
 	while (vcmd[i]) {
 		if (!strncmp(vcmd[i], p[0], 2)) {
 			p[0] += 2;
 			break;
 		}
 		i++;
 	}
 	switch (i) {
 	case 0:
 		/* AT+VNH - Auto hangup feature */
 		switch (*p[0]) {
 		case '?':
 			p[0]++;
 			isdn_tty_at_cout("\r\n1", info);
 			break;
 		case '=':
 			p[0]++;
 			switch (*p[0]) {
 			case '1':
 				p[0]++;
 				break;
 			case '?':
 				p[0]++;
 				isdn_tty_at_cout("\r\n1", info);
 				break;
 			default:
 				PARSE_ERROR1;
 			}
 			break;
 		default:
 			PARSE_ERROR1;
 		}
 		break;
 	case 1:
 		/* AT+VIP - Reset all voice parameters */
 		isdn_tty_modem_reset_vpar(m);
 		break;
 	case 2:
 		/* AT+VLS - Select device, accept incoming call */
 		switch (*p[0]) {
 		case '?':
 			p[0]++;
 			sprintf(rs, "\r\n%d", m->vpar[0]);
 			isdn_tty_at_cout(rs, info);
 			break;
 		case '=':
 			p[0]++;
 			switch (*p[0]) {
 			case '0':
 				p[0]++;
 				m->vpar[0] = 0;
 				break;
 			case '2':
 				p[0]++;
 				m->vpar[0] = 2;
 				break;
 			case '?':
 				p[0]++;
 				isdn_tty_at_cout("\r\n0,2", info);
 				break;
 			default:
 				PARSE_ERROR1;
 			}
 			break;
 		default:
 			PARSE_ERROR1;
 		}
 		break;
 	case 3:
 		/* AT+VRX - Start recording */
 		if (!m->vpar[0])
 			PARSE_ERROR1;
 		if (info->online != 1) {
 			isdn_tty_modem_result(RESULT_NO_ANSWER, info);
 			return 1;
 		}
 		info->dtmf_state = isdn_audio_dtmf_init(info->dtmf_state);
 		if (!info->dtmf_state) {
 			printk(KERN_WARNING "isdn_tty: Couldn't malloc dtmf state\n");
 			PARSE_ERROR1;
 		}
 		info->silence_state = isdn_audio_silence_init(info->silence_state);
 		if (!info->silence_state) {
 			printk(KERN_WARNING "isdn_tty: Couldn't malloc silence state\n");
 			PARSE_ERROR1;
 		}
 		if (m->vpar[3] < 5) {
 			info->adpcmr = isdn_audio_adpcm_init(info->adpcmr, m->vpar[3]);
 			if (!info->adpcmr) {
 				printk(KERN_WARNING "isdn_tty: Couldn't malloc adpcm state\n");
 				PARSE_ERROR1;
 			}
 		}
 #ifdef ISDN_DEBUG_AT
 		printk(KERN_DEBUG "AT: +VRX\n");
 #endif
 		info->vonline |= 1;
 		isdn_tty_modem_result(RESULT_CONNECT, info);
 		return 0;
 		break;
 	case 4:
 		/* AT+VSD - Silence detection */
 		switch (*p[0]) {
 		case '?':
 			p[0]++;
 			sprintf(rs, "\r\n<%d>,<%d>",
 				m->vpar[1],
 				m->vpar[2]);
 			isdn_tty_at_cout(rs, info);
 			break;
 		case '=':
 			p[0]++;
 			if ((*p[0] >= '0') && (*p[0] <= '9')) {
 				par1 = isdn_getnum(p);
 				if ((par1 < 0) || (par1 > 31))
 					PARSE_ERROR1;
 				if (*p[0] != ',')
 					PARSE_ERROR1;
 				p[0]++;
 				par2 = isdn_getnum(p);
 				if ((par2 < 0) || (par2 > 255))
 					PARSE_ERROR1;
 				m->vpar[1] = par1;
 				m->vpar[2] = par2;
 				break;
 			} else
 				if (*p[0] == '?') {
 					p[0]++;
 					isdn_tty_at_cout("\r\n<0-31>,<0-255>",
 							 info);
 					break;
 				} else
 					PARSE_ERROR1;
 			break;
 		default:
 			PARSE_ERROR1;
 		}
 		break;
 	case 5:
 		/* AT+VSM - Select compression */
 		switch (*p[0]) {
 		case '?':
 			p[0]++;
 			sprintf(rs, "\r\n<%d>,<%d><8000>",
 				m->vpar[3],
 				m->vpar[1]);
 			isdn_tty_at_cout(rs, info);
 			break;
 		case '=':
 			p[0]++;
 			switch (*p[0]) {
 			case '2':
 			case '3':
 			case '4':
 			case '5':
 			case '6':
 				par1 = isdn_getnum(p);
 				if ((par1 < 2) || (par1 > 6))
 					PARSE_ERROR1;
 				m->vpar[3] = par1;
 				break;
 			case '?':
 				p[0]++;
 				isdn_tty_at_cout("\r\n2;ADPCM;2;0;(8000)\r\n",
 						 info);
 				isdn_tty_at_cout("3;ADPCM;3;0;(8000)\r\n",
 						 info);
 				isdn_tty_at_cout("4;ADPCM;4;0;(8000)\r\n",
 						 info);
 				isdn_tty_at_cout("5;ALAW;8;0;(8000)\r\n",
 						 info);
 				isdn_tty_at_cout("6;ULAW;8;0;(8000)\r\n",
 						 info);
 				break;
 			default:
 				PARSE_ERROR1;
 			}
 			break;
 		default:
 			PARSE_ERROR1;
 		}
 		break;
 	case 6:
 		/* AT+VTX - Start sending */
 		if (!m->vpar[0])
 			PARSE_ERROR1;
 		if (info->online != 1) {
 			isdn_tty_modem_result(RESULT_NO_ANSWER, info);
 			return 1;
 		}
 		info->dtmf_state = isdn_audio_dtmf_init(info->dtmf_state);
 		if (!info->dtmf_state) {
 			printk(KERN_WARNING "isdn_tty: Couldn't malloc dtmf state\n");
 			PARSE_ERROR1;
 		}
 		if (m->vpar[3] < 5) {
 			info->adpcms = isdn_audio_adpcm_init(info->adpcms, m->vpar[3]);
 			if (!info->adpcms) {
 				printk(KERN_WARNING "isdn_tty: Couldn't malloc adpcm state\n");
 				PARSE_ERROR1;
 			}
 		}
 #ifdef ISDN_DEBUG_AT
 		printk(KERN_DEBUG "AT: +VTX\n");
 #endif
 		m->lastDLE = 0;
 		info->vonline |= 2;
 		isdn_tty_modem_result(RESULT_CONNECT, info);
 		return 0;
 		break;
 	case 7:
 		/* AT+VDD - DTMF detection */
 		switch (*p[0]) {
 		case '?':
 			p[0]++;
 			sprintf(rs, "\r\n<%d>,<%d>",
 				m->vpar[4],
 				m->vpar[5]);
 			isdn_tty_at_cout(rs, info);
 			break;
 		case '=':
 			p[0]++;
 			if ((*p[0] >= '0') && (*p[0] <= '9')) {
 				if (info->online != 1)
 					PARSE_ERROR1;
 				par1 = isdn_getnum(p);
 				if ((par1 < 0) || (par1 > 15))
 					PARSE_ERROR1;
 				if (*p[0] != ',')
 					PARSE_ERROR1;
 				p[0]++;
 				par2 = isdn_getnum(p);
 				if ((par2 < 0) || (par2 > 255))
 					PARSE_ERROR1;
 				m->vpar[4] = par1;
 				m->vpar[5] = par2;
 				cmd.driver = info->isdn_driver;
 				cmd.command = ISDN_CMD_AUDIO;
 				cmd.arg = info->isdn_channel + (ISDN_AUDIO_SETDD << 8);
 				cmd.parm.num[0] = par1;
 				cmd.parm.num[1] = par2;
 				isdn_command(&cmd);
 				break;
 			} else
 				if (*p[0] == '?') {
 					p[0]++;
 					isdn_tty_at_cout("\r\n<0-15>,<0-255>",
 							 info);
 					break;
 				} else
 					PARSE_ERROR1;
 			break;
 		default:
 			PARSE_ERROR1;
 		}
 		break;
 	default:
 		PARSE_ERROR1;
 	}
 	return 0;
 }
 #endif                          /* CONFIG_ISDN_AUDIO */

 /*
  * Parse and perform an AT-command-line.
  */
 static void
 isdn_tty_parse_at(modem_info *info)
 {
 	atemu *m = &info->emu;
 	char *p;
 	char ds[ISDN_MSNLEN];

 #ifdef ISDN_DEBUG_AT
 	printk(KERN_DEBUG "AT: '%s'\n", m->mdmcmd);
 #endif
 	for (p = &m->mdmcmd[2]; *p;) {
 		switch (*p) {
 		case ' ':
 			p++;
 			break;
 		case 'A':
 			/* A - Accept incoming call */
 			p++;
 			isdn_tty_cmd_ATA(info);
 			return;
 		case 'D':
 			/* D - Dial */
 			if (info->msr & UART_MSR_DCD)
 				PARSE_ERROR;
 			if (info->msr & UART_MSR_RI) {
 				isdn_tty_modem_result(RESULT_NO_CARRIER, info);
 				return;
 			}
 			isdn_tty_getdial(++p, ds, sizeof ds);
 			p += strlen(p);
 			if (!strlen(m->msn))
 				isdn_tty_modem_result(RESULT_NO_MSN_EAZ, info);
 			else if (strlen(ds))
 				isdn_tty_dial(ds, info, m);
 			else
 				PARSE_ERROR;
 			return;
 		case 'E':
 			/* E - Turn Echo on/off */
 			p++;
 			switch (isdn_getnum(&p)) {
 			case 0:
 				m->mdmreg[REG_ECHO] &= ~BIT_ECHO;
 				break;
 			case 1:
 				m->mdmreg[REG_ECHO] |= BIT_ECHO;
 				break;
 			default:
 				PARSE_ERROR;
 			}
 			break;
 		case 'H':
 			/* H - On/Off-hook */
 			p++;
 			switch (*p) {
 			case '0':
 				p++;
 				isdn_tty_on_hook(info);
 				break;
 			case '1':
 				p++;
 				isdn_tty_off_hook();
 				break;
 			default:
 				isdn_tty_on_hook(info);
 				break;
 			}
 			break;
 		case 'I':
 			/* I - Information */
 			p++;
 			isdn_tty_at_cout("\r\nLinux ISDN", info);
 			switch (*p) {
 			case '0':
 			case '1':
 				p++;
 				break;
 			case '2':
 				p++;
 				isdn_tty_report(info);
 				break;
 			case '3':
 				p++;
 				snprintf(ds, sizeof(ds), "\r\n%d", info->emu.charge);
 				isdn_tty_at_cout(ds, info);
 				break;
 			default:;
 			}
 			break;
 #ifdef DUMMY_HAYES_AT
 		case 'L':
 		case 'M':
 			/* only for be compilant with common scripts */
 			/* no function */
 			p++;
 			isdn_getnum(&p);
 			break;
 #endif
 		case 'O':
 			/* O - Go online */
 			p++;
 			if (info->msr & UART_MSR_DCD)
 				/* if B-Channel is up */
 				isdn_tty_modem_result((m->mdmreg[REG_L2PROT] == ISDN_PROTO_L2_MODEM) ? RESULT_CONNECT : RESULT_CONNECT64000, info);
 			else
 				isdn_tty_modem_result(RESULT_NO_CARRIER, info);
 			return;
 		case 'Q':
 			/* Q - Turn Emulator messages on/off */
 			p++;
 			switch (isdn_getnum(&p)) {
 			case 0:
 				m->mdmreg[REG_RESP] |= BIT_RESP;
 				break;
 			case 1:
 				m->mdmreg[REG_RESP] &= ~BIT_RESP;
 				break;
 			default:
 				PARSE_ERROR;
 			}
 			break;
 		case 'S':
 			/* S - Set/Get Register */
 			p++;
 			if (isdn_tty_cmd_ATS(&p, info))
 				return;
 			break;
 		case 'V':
 			/* V - Numeric or ASCII Emulator-messages */
 			p++;
 			switch (isdn_getnum(&p)) {
 			case 0:
 				m->mdmreg[REG_RESP] |= BIT_RESPNUM;
 				break;
 			case 1:
 				m->mdmreg[REG_RESP] &= ~BIT_RESPNUM;
 				break;
 			default:
 				PARSE_ERROR;
 			}
 			break;
 		case 'Z':
 			/* Z - Load Registers from Profile */
 			p++;
 			if (info->msr & UART_MSR_DCD) {
 				info->online = 0;
 				isdn_tty_on_hook(info);
 			}
 			isdn_tty_modem_reset_regs(info, 1);
 			break;
 		case '+':
 			p++;
 			switch (*p) {
 #ifdef CONFIG_ISDN_AUDIO
 			case 'F':
 				p++;
 				if (isdn_tty_cmd_PLUSF(&p, info))
 					return;
 				break;
 			case 'V':
 				if ((!(m->mdmreg[REG_SI1] & 1)) ||
 				    (m->mdmreg[REG_L2PROT] == ISDN_PROTO_L2_MODEM))
 					PARSE_ERROR;
 				p++;
 				if (isdn_tty_cmd_PLUSV(&p, info))
 					return;
 				break;
 #endif                          /* CONFIG_ISDN_AUDIO */
 			case 'S':	/* SUSPEND */
 				p++;
 				isdn_tty_get_msnstr(ds, &p);
 				isdn_tty_suspend(ds, info, m);
 				break;
 			case 'R':	/* RESUME */
 				p++;
 				isdn_tty_get_msnstr(ds, &p);
 				isdn_tty_resume(ds, info, m);
 				break;
 			case 'M':	/* MESSAGE */
 				p++;
 				isdn_tty_send_msg(info, m, p);
 				break;
 			default:
 				PARSE_ERROR;
 			}
 			break;
 		case '&':
 			p++;
 			if (isdn_tty_cmd_ATand(&p, info))
 				return;
 			break;
 		default:
 			PARSE_ERROR;
 		}
 	}
 #ifdef CONFIG_ISDN_AUDIO
 	if (!info->vonline)
 #endif
 		isdn_tty_modem_result(RESULT_OK, info);
 }

 /* Need own toupper() because standard-toupper is not available
  * within modules.
  */
 #define my_toupper(c) (((c >= 'a') && (c <= 'z')) ? (c & 0xdf) : c)

 /*
  * Perform line-editing of AT-commands
  *
  * Parameters:
  *   p        inputbuffer
  *   count    length of buffer
  *   channel  index to line (minor-device)
  */
 static int
 isdn_tty_edit_at(const char *p, int count, modem_info *info)
 {
 	atemu *m = &info->emu;
 	int total = 0;
 	u_char c;
 	char eb[2];
 	int cnt;

 	for (cnt = count; cnt > 0; p++, cnt--) {
 		c = *p;
 		total++;
 		if (c == m->mdmreg[REG_CR] || c == m->mdmreg[REG_LF]) {
 			/* Separator (CR or LF) */
 			m->mdmcmd[m->mdmcmdl] = 0;
 			if (m->mdmreg[REG_ECHO] & BIT_ECHO) {
 				eb[0] = c;
 				eb[1] = 0;
 				isdn_tty_at_cout(eb, info);
 			}
 			if ((m->mdmcmdl >= 2) && (!(strncmp(m->mdmcmd, "AT", 2))))
 				isdn_tty_parse_at(info);
 			m->mdmcmdl = 0;
 			continue;
 		}
 		if (c == m->mdmreg[REG_BS] && m->mdmreg[REG_BS] < 128) {
 			/* Backspace-Function */
 			if ((m->mdmcmdl > 2) || (!m->mdmcmdl)) {
 				if (m->mdmcmdl)
 					m->mdmcmdl--;
 				if (m->mdmreg[REG_ECHO] & BIT_ECHO)
 					isdn_tty_at_cout("\b", info);
 			}
 			continue;
 		}
 		if (cmdchar(c)) {
 			if (m->mdmreg[REG_ECHO] & BIT_ECHO) {
 				eb[0] = c;
 				eb[1] = 0;
 				isdn_tty_at_cout(eb, info);
 			}
 			if (m->mdmcmdl < 255) {
 				c = my_toupper(c);
 				switch (m->mdmcmdl) {
 				case 1:
 					if (c == 'T') {
 						m->mdmcmd[m->mdmcmdl] = c;
 						m->mdmcmd[++m->mdmcmdl] = 0;
 						break;
 					} else
 						m->mdmcmdl = 0;
 					/* Fall through, check for 'A' */
 				case 0:
 					if (c == 'A') {
 						m->mdmcmd[m->mdmcmdl] = c;
 						m->mdmcmd[++m->mdmcmdl] = 0;
 					}
 					break;
 				default:
 					m->mdmcmd[m->mdmcmdl] = c;
 					m->mdmcmd[++m->mdmcmdl] = 0;
 				}
 			}
 		}
 	}
 	return total;
 }

 /*
  * Switch all modem-channels who are online and got a valid
  * escape-sequence 1.5 seconds ago, to command-mode.
  * This function is called every second via timer-interrupt from within
  * timer-dispatcher isdn_timer_function()
  */
 void
 isdn_tty_modem_escape(void)
 {
 	int ton = 0;
 	int i;
 	int midx;

 	for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 		if (USG_MODEM(dev->usage[i]) && (midx = dev->m_idx[i]) >= 0) {
 			modem_info *info = &dev->mdm.info[midx];
 			if (info->online) {
 				ton = 1;
 				if ((info->emu.pluscount == 3) &&
 				    time_after(jiffies,
 					    info->emu.lastplus + PLUSWAIT2)) {
 					info->emu.pluscount = 0;
 					info->online = 0;
 					isdn_tty_modem_result(RESULT_OK, info);
 				}
 			}
 		}
 	isdn_timer_ctrl(ISDN_TIMER_MODEMPLUS, ton);
 }

 /*
  * Put a RING-message to all modem-channels who have the RI-bit set.
  * This function is called every second via timer-interrupt from within
  * timer-dispatcher isdn_timer_function()
  */
 void
 isdn_tty_modem_ring(void)
 {
 	int ton = 0;
 	int i;

 	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
 		modem_info *info = &dev->mdm.info[i];
 		if (info->msr & UART_MSR_RI) {
 			ton = 1;
 			isdn_tty_modem_result(RESULT_RING, info);
 		}
 	}
 	isdn_timer_ctrl(ISDN_TIMER_MODEMRING, ton);
 }

 /*
  * For all online tty's, try sending data to
  * the lower levels.
  */
 void
 isdn_tty_modem_xmit(void)
 {
 	int ton = 1;
 	int i;

 	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
 		modem_info *info = &dev->mdm.info[i];
 		if (info->online) {
 			ton = 1;
 			isdn_tty_senddown(info);
 			isdn_tty_tint(info);
 		}
 	}
 	isdn_timer_ctrl(ISDN_TIMER_MODEMXMIT, ton);
 }

 /*
  * Check all channels if we have a 'no carrier' timeout.
  * Timeout value is set by Register S7.
  */
 void
 isdn_tty_carrier_timeout(void)
 {
 	int ton = 0;
 	int i;

 	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
 		modem_info *info = &dev->mdm.info[i];
 		if (!info->dialing)
 			continue;
 		if (info->emu.carrierwait++ > info->emu.mdmreg[REG_WAITC]) {
 			info->dialing = 0;
 			isdn_tty_modem_result(RESULT_NO_CARRIER, info);
 			isdn_tty_modem_hup(info, 1);
 		} else
 			ton = 1;
 	}
 	isdn_timer_ctrl(ISDN_TIMER_CARRIER, ton);
 }