Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 3911 insertions, 0 deletions

diff --git a/drivers/isdn/i4l/isdn_tty.c b/drivers/isdn/i4l/isdn_tty.c
new file mode 100644
index 0000000..e21007e
--- /dev/null
+++ b/drivers/isdn/i4l/isdn_tty.c
@@ -0,0 +1,3911 @@
+/* $Id: isdn_tty.c,v 1.1.2.3 2004/02/10 01:07:13 keil Exp $
+ *
+ * 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/config.h>
+#include <linux/isdn.h>
+#include <linux/delay.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 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};
+
+char *isdn_tty_revision = "$Revision: 1.1.2.3 $";
+
+
+/* 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)
+{
+	int c;
+	int len;
+	struct tty_struct *tty;
+
+	if (info->online) {
+		if ((tty = info->tty)) {
+			if (info->mcr & UART_MCR_RTS) {
+				c = TTY_FLIPBUF_SIZE - tty->flip.count;
+				len = skb->len
+#ifdef CONFIG_ISDN_AUDIO
+					+ ISDN_AUDIO_SKB_DLECOUNT(skb)
+#endif
+					;
+				if (c >= len) {
+#ifdef CONFIG_ISDN_AUDIO
+					if (ISDN_AUDIO_SKB_DLECOUNT(skb))
+						while (skb->len--) {
+							if (*skb->data == DLE)
+								tty_insert_flip_char(tty, DLE, 0);
+							tty_insert_flip_char(tty, *skb->data++, 0);
+					} else {
+#endif
+						memcpy(tty->flip.char_buf_ptr,
+						       skb->data, len);
+						tty->flip.count += len;
+						tty->flip.char_buf_ptr += len;
+						memset(tty->flip.flag_buf_ptr, 0, len);
+						tty->flip.flag_buf_ptr += len;
+#ifdef CONFIG_ISDN_AUDIO
+					}
+#endif
+					if (info->emu.mdmreg[REG_CPPP] & BIT_CPPP)
+						tty->flip.flag_buf_ptr[len - 1] = 0xff;
+					schedule_delayed_work(&tty->flip.work, 1);
+					kfree_skb(skb);
+					return 1;
+				}
+			}
+		}
+	}
+	return 0;
+}
+
+/* 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 c;
+	int r;
+	struct tty_struct *tty;
+	modem_info *info;
+
+	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
+		if ((midx = dev->m_idx[i]) >= 0) {
+			info = &dev->mdm.info[midx];
+			if (info->online) {
+				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 ((tty = info->tty)) {
+					if (info->mcr & UART_MCR_RTS) {
+						c = TTY_FLIPBUF_SIZE - tty->flip.count;
+						if (c > 0) {
+							r = isdn_readbchan(info->isdn_driver, info->isdn_channel,
+									   tty->flip.char_buf_ptr,
+									   tty->flip.flag_buf_ptr, c, NULL);
+							/* CISCO AsyncPPP Hack */
+							if (!(info->emu.mdmreg[REG_CPPP] & BIT_CPPP))
+								memset(tty->flip.flag_buf_ptr, 0, r);
+							tty->flip.count += r;
+							tty->flip.flag_buf_ptr += r;
+							tty->flip.char_buf_ptr += r;
+							if (r)
+								schedule_delayed_work(&tty->flip.work, 1);
+						}
+					} else
+						r = 1;
+				} 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-flip-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;
+}
+
+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->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->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->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 flip-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
+ */
+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->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;
+	if (info->dtmf_state) {
+		kfree(info->dtmf_state);
+		info->dtmf_state = NULL;
+	}
+	if (info->silence_state) {
+		kfree(info->silence_state);
+		info->silence_state = NULL;
+	}
+	if (info->adpcms) {
+		kfree(info->adpcms);
+		info->adpcms = NULL;
+	}
+	if (info->adpcmr) {
+		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>
+
+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. unfortunatly 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 = strlen(msg);
+	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)
+{
+	uint cflag,
+	 cval,
+	 fcr,
+	 quot;
+	int i;
+
+	if (!info->tty || !info->tty->termios)
+		return;
+	cflag = info->tty->termios->c_cflag;
+
+	quot = i = cflag & CBAUD;
+	if (i & CBAUDEX) {
+		i &= ~CBAUDEX;
+		if (i < 1 || i > 2)
+			info->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;
+	fcr = 0;
+
+	/* CTS flow control flag and modem status interrupts */
+	if (cflag & CRTSCTS) {
+		info->flags |= ISDN_ASYNC_CTS_FLOW;
+	} else
+		info->flags &= ~ISDN_ASYNC_CTS_FLOW;
+	if (cflag & CLOCAL)
+		info->flags &= ~ISDN_ASYNC_CHECK_CD;
+	else {
+		info->flags |= ISDN_ASYNC_CHECK_CD;
+	}
+}
+
+static int
+isdn_tty_startup(modem_info * info)
+{
+	if (info->flags & ISDN_ASYNC_INITIALIZED)
+		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->tty)
+		clear_bit(TTY_IO_ERROR, &info->tty->flags);
+	/*
+	 * and set the speed of the serial port
+	 */
+	isdn_tty_change_speed(info);
+
+	info->flags |= ISDN_ASYNC_INITIALIZED;
+	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 (!(info->flags & ISDN_ASYNC_INITIALIZED))
+		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->tty || (info->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->tty)
+		set_bit(TTY_IO_ERROR, &info->tty->flags);
+
+	info->flags &= ~ISDN_ASYNC_INITIALIZED;
+}
+
+/* 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->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_len(&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;
+	wake_up_interruptible(&tty->write_wait);
+	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_len(&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, struct file *file)
+{
+	modem_info *info = (modem_info *) tty->driver_data;
+	u_char control, status;
+
+	if (isdn_tty_paranoia_check(info, tty->name, __FUNCTION__))
+		return -ENODEV;
+	if (tty->flags & (1 << TTY_IO_ERROR))
+		return -EIO;
+
+#ifdef ISDN_DEBUG_MODEM_IOCTL
+	printk(KERN_DEBUG "ttyI%d ioctl TIOCMGET\n", info->line);
+#endif
+
+	control = info->mcr;
+	status = info->msr;
+	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, struct file *file,
+		unsigned int set, unsigned int clear)
+{
+	modem_info *info = (modem_info *) tty->driver_data;
+
+	if (isdn_tty_paranoia_check(info, tty->name, __FUNCTION__))
+		return -ENODEV;
+	if (tty->flags & (1 << TTY_IO_ERROR))
+		return -EIO;
+
+#ifdef ISDN_DEBUG_MODEM_IOCTL
+	printk(KERN_DEBUG "ttyI%d ioctl TIOCMxxx: %x %x\n", info->line, set, clear);
+#endif
+
+	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);
+		}
+	}
+	return 0;
+}
+
+static int
+isdn_tty_ioctl(struct tty_struct *tty, struct file *file,
+	       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->flags & (1 << TTY_IO_ERROR))
+		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 TIOCGSOFTCAR:
+#ifdef ISDN_DEBUG_MODEM_IOCTL
+			printk(KERN_DEBUG "ttyI%d ioctl TIOCGSOFTCAR\n", info->line);
+#endif
+			return put_user(C_CLOCAL(tty) ? 1 : 0, (ulong __user *) arg);
+		case TIOCSSOFTCAR:
+#ifdef ISDN_DEBUG_MODEM_IOCTL
+			printk(KERN_DEBUG "ttyI%d ioctl TIOCSSOFTCAR\n", info->line);
+#endif
+			if (get_user(arg, (ulong __user *) arg))
+				return -EFAULT;
+			tty->termios->c_cflag =
+			    ((tty->termios->c_cflag & ~CLOCAL) |
+			     (arg ? CLOCAL : 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 termios *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)
+			return;
+		isdn_tty_change_speed(info);
+		if ((old_termios->c_cflag & CRTSCTS) &&
+		    !(tty->termios->c_cflag & CRTSCTS)) {
+			tty->hw_stopped = 0;
+		}
+	}
+}
+
+/*
+ * ------------------------------------------------------------
+ * isdn_tty_open() and friends
+ * ------------------------------------------------------------
+ */
+static int
+isdn_tty_block_til_ready(struct tty_struct *tty, struct file *filp, modem_info * info)
+{
+	DECLARE_WAITQUEUE(wait, NULL);
+	int do_clocal = 0;
+	int retval;
+
+	/*
+	 * If the device is in the middle of being closed, then block
+	 * until it's done, and then try again.
+	 */
+	if (tty_hung_up_p(filp) ||
+	    (info->flags & ISDN_ASYNC_CLOSING)) {
+		if (info->flags & ISDN_ASYNC_CLOSING)
+			interruptible_sleep_on(&info->close_wait);
+#ifdef MODEM_DO_RESTART
+		if (info->flags & ISDN_ASYNC_HUP_NOTIFY)
+			return -EAGAIN;
+		else
+			return -ERESTARTSYS;
+#else
+		return -EAGAIN;
+#endif
+	}
+	/*
+	 * If non-blocking mode is set, then make the check up front
+	 * and then exit.
+	 */
+	if ((filp->f_flags & O_NONBLOCK) ||
+	    (tty->flags & (1 << TTY_IO_ERROR))) {
+		if (info->flags & ISDN_ASYNC_CALLOUT_ACTIVE)
+			return -EBUSY;
+		info->flags |= ISDN_ASYNC_NORMAL_ACTIVE;
+		return 0;
+	}
+	if (info->flags & ISDN_ASYNC_CALLOUT_ACTIVE) {
+		if (info->normal_termios.c_cflag & CLOCAL)
+			do_clocal = 1;
+	} else {
+		if (tty->termios->c_cflag & CLOCAL)
+			do_clocal = 1;
+	}
+	/*
+	 * Block waiting for the carrier detect and the line to become
+	 * free (i.e., not in use by the callout).  While we are in
+	 * this loop, info->count is dropped by one, so that
+	 * isdn_tty_close() knows when to free things.  We restore it upon
+	 * exit, either normal or abnormal.
+	 */
+	retval = 0;
+	add_wait_queue(&info->open_wait, &wait);
+#ifdef ISDN_DEBUG_MODEM_OPEN
+	printk(KERN_DEBUG "isdn_tty_block_til_ready before block: ttyi%d, count = %d\n",
+	       info->line, info->count);
+#endif
+	if (!(tty_hung_up_p(filp)))
+		info->count--;
+	info->blocked_open++;
+	while (1) {
+		set_current_state(TASK_INTERRUPTIBLE);
+		if (tty_hung_up_p(filp) ||
+		    !(info->flags & ISDN_ASYNC_INITIALIZED)) {
+#ifdef MODEM_DO_RESTART
+			if (info->flags & ISDN_ASYNC_HUP_NOTIFY)
+				retval = -EAGAIN;
+			else
+				retval = -ERESTARTSYS;
+#else
+			retval = -EAGAIN;
+#endif
+			break;
+		}
+		if (!(info->flags & ISDN_ASYNC_CALLOUT_ACTIVE) &&
+		    !(info->flags & ISDN_ASYNC_CLOSING) &&
+		    (do_clocal || (info->msr & UART_MSR_DCD))) {
+			break;
+		}
+		if (signal_pending(current)) {
+			retval = -ERESTARTSYS;
+			break;
+		}
+#ifdef ISDN_DEBUG_MODEM_OPEN
+		printk(KERN_DEBUG "isdn_tty_block_til_ready blocking: ttyi%d, count = %d\n",
+		       info->line, info->count);
+#endif
+		schedule();
+	}
+	current->state = TASK_RUNNING;
+	remove_wait_queue(&info->open_wait, &wait);
+	if (!tty_hung_up_p(filp))
+		info->count++;
+	info->blocked_open--;
+#ifdef ISDN_DEBUG_MODEM_OPEN
+	printk(KERN_DEBUG "isdn_tty_block_til_ready after blocking: ttyi%d, count = %d\n",
+	       info->line, info->count);
+#endif
+	if (retval)
+		return retval;
+	info->flags |= ISDN_ASYNC_NORMAL_ACTIVE;
+	return 0;
+}
+
+/*
+ * 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;
+	int retval, line;
+
+	line = tty->index;
+	if (line < 0 || line > ISDN_MAX_CHANNELS)
+		return -ENODEV;
+	info = &dev->mdm.info[line];
+	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_open"))
+		return -ENODEV;
+	if (!try_module_get(info->owner)) {
+		printk(KERN_WARNING "%s: cannot reserve module\n", __FUNCTION__);
+		return -ENODEV;
+	}
+#ifdef ISDN_DEBUG_MODEM_OPEN
+	printk(KERN_DEBUG "isdn_tty_open %s, count = %d\n", tty->name, 
+	       info->count);
+#endif
+	info->count++;
+	tty->driver_data = info;
+	info->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
+		module_put(info->owner);
+		return retval;
+	}
+	retval = isdn_tty_block_til_ready(tty, filp, info);
+	if (retval) {
+#ifdef ISDN_DEBUG_MODEM_OPEN
+		printk(KERN_DEBUG "isdn_tty_open return after isdn_tty_block_til_ready \n");
+#endif
+		module_put(info->owner);
+		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;
+	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) && (info->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", info->count);
+		info->count = 1;
+	}
+	if (--info->count < 0) {
+		printk(KERN_ERR "isdn_tty_close: bad port count for ttyi%d: %d\n",
+		       info->line, info->count);
+		info->count = 0;
+	}
+	if (info->count) {
+#ifdef ISDN_DEBUG_MODEM_OPEN
+		printk(KERN_DEBUG "isdn_tty_close after info->count != 0\n");
+#endif
+		return;
+	}
+	info->flags |= ISDN_ASYNC_CLOSING;
+	/*
+	 * Save the termios structure, since this port may have
+	 * separate termios for callout and dialin.
+	 */
+	if (info->flags & ISDN_ASYNC_NORMAL_ACTIVE)
+		info->normal_termios = *tty->termios;
+	if (info->flags & ISDN_ASYNC_CALLOUT_ACTIVE)
+		info->callout_termios = *tty->termios;
+
+	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 (info->flags & ISDN_ASYNC_INITIALIZED) {
+		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)) {
+			set_current_state(TASK_INTERRUPTIBLE);
+			schedule_timeout(20);
+			if (time_after(jiffies,timeout))
+				break;
+		}
+	}
+	dev->modempoll--;
+	isdn_tty_shutdown(info);
+	
+	if (tty->driver->flush_buffer)
+		tty->driver->flush_buffer(tty);
+	tty_ldisc_flush(tty);
+	info->tty = NULL;
+	info->ncarrier = 0;
+	tty->closing = 0;
+	module_put(info->owner);
+	if (info->blocked_open) {
+		msleep_interruptible(500);
+		wake_up_interruptible(&info->open_wait);
+	}
+	info->flags &= ~(ISDN_ASYNC_NORMAL_ACTIVE | ISDN_ASYNC_CLOSING);
+	wake_up_interruptible(&info->close_wait);
+#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;
+
+	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_hangup"))
+		return;
+	isdn_tty_shutdown(info);
+	info->count = 0;
+	info->flags &= ~(ISDN_ASYNC_NORMAL_ACTIVE | ISDN_ASYNC_CALLOUT_ACTIVE);
+	info->tty = NULL;
+	wake_up_interruptible(&info->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 struct tty_operations modem_ops = {
+        .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,
+};
+
+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->devfs_name = "isdn/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 | TTY_DRIVER_NO_DEVFS;
+	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
+#ifdef MODULE
+		info->owner = THIS_MODULE;
+#endif
+		spin_lock_init(&info->readlock);
+		init_MUTEX(&info->write_sem);
+		sprintf(info->last_cause, "0000");
+		sprintf(info->last_num, "none");
+		info->last_dir = 0;
+		info->last_lhup = 1;
+		info->last_l2 = -1;
+		info->last_si = 0;
+		isdn_tty_reset_profile(&info->emu);
+		isdn_tty_modem_reset_regs(info, 1);
+		info->magic = ISDN_ASYNC_MAGIC;
+		info->line = i;
+		info->tty = NULL;
+		info->x_char = 0;
+		info->count = 0;
+		info->blocked_open = 0;
+		init_waitqueue_head(&info->open_wait);
+		init_waitqueue_head(&info->close_wait);
+		info->isdn_driver = -1;
+		info->isdn_channel = -1;
+		info->drv_index = -1;
+		info->xmit_size = ISDN_SERIAL_XMIT_SIZE;
+		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
+		if (!(info->xmit_buf = kmalloc(ISDN_SERIAL_XMIT_MAX + 5, GFP_KERNEL))) {
+			printk(KERN_ERR "Could not allocate modem xmit-buffer\n");
+			retval = -ENOMEM;
+			goto err_unregister;
+		}
+		/* Make room for T.70 header */
+		info->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->xmit_buf - 4);
+	}
+	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->xmit_buf - 4);
+	}
+	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->count == 0)
+                    continue;
+		if ((info->emu.mdmreg[REG_SI1] & si2bit[si1]) &&  /* SI1 is matching */
+		    (info->emu.mdmreg[REG_SI2] == si2))	{         /* SI2 is matching */
+			idx = isdn_dc2minor(di, ch);
+#ifdef ISDN_DEBUG_MODEM_ICALL
+			printk(KERN_DEBUG "m_fi: match1 wret=%d\n", wret);
+			printk(KERN_DEBUG "m_fi: idx=%d flags=%08lx drv=%d ch=%d usg=%d\n", idx,
+			       info->flags, info->isdn_driver, info->isdn_channel,
+			       dev->usage[idx]);
+#endif
+			if (
+#ifndef FIX_FILE_TRANSFER
+				(info->flags & ISDN_ASYNC_NORMAL_ACTIVE) &&
+#endif
+				(info->isdn_driver == -1) &&
+				(info->isdn_channel == -1) &&
+				(USG_NONE(dev->usage[idx]))) {
+				int matchret;
+
+				if ((matchret = isdn_tty_match_icall(eaz, &info->emu, di)) > wret)
+					wret = matchret;
+				if (!matchret) {                  /* EAZ is matching */
+					info->isdn_driver = di;
+					info->isdn_channel = ch;
+					info->drv_index = idx;
+					dev->m_idx[idx] = info->line;
+					dev->usage[idx] &= ISDN_USAGE_EXCLUSIVE;
+					dev->usage[idx] |= isdn_calc_usage(si1, info->emu.mdmreg[REG_L2PROT]); 
+					strcpy(dev->num[idx], nr);
+					strcpy(info->emu.cpn, eaz);
+					info->emu.mdmreg[REG_SI1I] = si2bit[si1];
+					info->emu.mdmreg[REG_PLAN] = setup->plan;
+					info->emu.mdmreg[REG_SCREEN] = setup->screen;
+					isdn_info_update();
+					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;
+}
+
+#define TTY_IS_ACTIVE(info) \
+	(info->flags & (ISDN_ASYNC_NORMAL_ACTIVE | ISDN_ASYNC_CALLOUT_ACTIVE))
+
+int
+isdn_tty_stat_callback(int i, isdn_ctrl *c)
+{
+	int mi;
+	modem_info *info;
+	char *e;
+
+	if (i < 0)
+		return 0;
+	if ((mi = dev->m_idx[i]) >= 0) {
+		info = &dev->mdm.info[mi];
+		switch (c->command) {
+                        case ISDN_STAT_CINF:
+                                printk(KERN_DEBUG "CHARGEINFO on ttyI%d: %ld %s\n", info->line, c->arg, c->parm.num);
+                                info->emu.charge = (unsigned) simple_strtoul(c->parm.num, &e, 10);
+                                if (e == (char *)c->parm.num)
+					info->emu.charge = 0;
+				
+                                break;			
+			case ISDN_STAT_BSENT:
+#ifdef ISDN_TTY_STAT_DEBUG
+				printk(KERN_DEBUG "tty_STAT_BSENT ttyI%d\n", info->line);
+#endif
+				if ((info->isdn_driver == c->driver) &&
+				    (info->isdn_channel == c->arg)) {
+					info->msr |= UART_MSR_CTS;
+					if (info->send_outstanding)
+						if (!(--info->send_outstanding))
+							info->lsr |= UART_LSR_TEMT;
+					isdn_tty_tint(info);
+					return 1;
+				}
+				break;
+			case ISDN_STAT_CAUSE:
+#ifdef ISDN_TTY_STAT_DEBUG
+				printk(KERN_DEBUG "tty_STAT_CAUSE ttyI%d\n", info->line);
+#endif
+				/* Signal cause to tty-device */
+				strncpy(info->last_cause, c->parm.num, 5);
+				return 1;
+			case ISDN_STAT_DISPLAY:
+#ifdef ISDN_TTY_STAT_DEBUG
+				printk(KERN_DEBUG "tty_STAT_DISPLAY ttyI%d\n", info->line);
+#endif
+				/* Signal display to tty-device */
+				if ((info->emu.mdmreg[REG_DISPLAY] & BIT_DISPLAY) && 
+					!(info->emu.mdmreg[REG_RESPNUM] & BIT_RESPNUM)) {
+				  isdn_tty_at_cout("\r\n", info);
+				  isdn_tty_at_cout("DISPLAY: ", info);
+				  isdn_tty_at_cout(c->parm.display, info);
+				  isdn_tty_at_cout("\r\n", info);
+				}
+				return 1;
+			case ISDN_STAT_DCONN:
+#ifdef ISDN_TTY_STAT_DEBUG
+				printk(KERN_DEBUG "tty_STAT_DCONN ttyI%d\n", info->line);
+#endif
+				if (TTY_IS_ACTIVE(info)) {
+					if (info->dialing == 1) {
+						info->dialing = 2;
+						return 1;
+					}
+				}
+				break;
+			case ISDN_STAT_DHUP:
+#ifdef ISDN_TTY_STAT_DEBUG
+				printk(KERN_DEBUG "tty_STAT_DHUP ttyI%d\n", info->line);
+#endif
+				if (TTY_IS_ACTIVE(info)) {
+					if (info->dialing == 1) 
+						isdn_tty_modem_result(RESULT_BUSY, info);
+					if (info->dialing > 1) 
+						isdn_tty_modem_result(RESULT_NO_CARRIER, info);
+					info->dialing = 0;
+#ifdef ISDN_DEBUG_MODEM_HUP
+					printk(KERN_DEBUG "Mhup in ISDN_STAT_DHUP\n");
+#endif
+					isdn_tty_modem_hup(info, 0);
+					return 1;
+				}
+				break;
+			case ISDN_STAT_BCONN:
+#ifdef ISDN_TTY_STAT_DEBUG
+				printk(KERN_DEBUG "tty_STAT_BCONN ttyI%d\n", info->line);
+#endif
+				/* Wake up any processes waiting
+				 * for incoming call of this device when
+				 * DCD follow the state of incoming carrier
+				 */
+				if (info->blocked_open &&
+				   (info->emu.mdmreg[REG_DCD] & BIT_DCD)) {
+					wake_up_interruptible(&info->open_wait);
+				}
+
+				/* Schedule CONNECT-Message to any tty
+				 * waiting for it and
+				 * set DCD-bit of its modem-status.
+				 */
+				if (TTY_IS_ACTIVE(info) ||
+				    (info->blocked_open && (info->emu.mdmreg[REG_DCD] & BIT_DCD))) {
+					info->msr |= UART_MSR_DCD;
+					info->emu.charge = 0;
+					if (info->dialing & 0xf)
+						info->last_dir = 1;
+					else
+						info->last_dir = 0;
+					info->dialing = 0;
+					info->rcvsched = 1;
+					if (USG_MODEM(dev->usage[i])) {
+						if (info->emu.mdmreg[REG_L2PROT] == ISDN_PROTO_L2_MODEM) {
+							strcpy(info->emu.connmsg, c->parm.num);
+							isdn_tty_modem_result(RESULT_CONNECT, info);
+						} else
+							isdn_tty_modem_result(RESULT_CONNECT64000, info);
+					}
+					if (USG_VOICE(dev->usage[i]))
+						isdn_tty_modem_result(RESULT_VCON, info);
+					return 1;
+				}
+				break;
+			case ISDN_STAT_BHUP:
+#ifdef ISDN_TTY_STAT_DEBUG
+				printk(KERN_DEBUG "tty_STAT_BHUP ttyI%d\n", info->line);
+#endif
+				if (TTY_IS_ACTIVE(info)) {
+#ifdef ISDN_DEBUG_MODEM_HUP
+					printk(KERN_DEBUG "Mhup in ISDN_STAT_BHUP\n");
+#endif
+					isdn_tty_modem_hup(info, 0);
+					return 1;
+				}
+				break;
+			case ISDN_STAT_NODCH:
+#ifdef ISDN_TTY_STAT_DEBUG
+				printk(KERN_DEBUG "tty_STAT_NODCH ttyI%d\n", info->line);
+#endif
+				if (TTY_IS_ACTIVE(info)) {
+					if (info->dialing) {
+						info->dialing = 0;
+						info->last_l2 = -1;
+						info->last_si = 0;
+						sprintf(info->last_cause, "0000");
+						isdn_tty_modem_result(RESULT_NO_DIALTONE, info);
+					}
+					isdn_tty_modem_hup(info, 0);
+					return 1;
+				}
+				break;
+			case ISDN_STAT_UNLOAD:
+#ifdef ISDN_TTY_STAT_DEBUG
+				printk(KERN_DEBUG "tty_STAT_UNLOAD ttyI%d\n", info->line);
+#endif
+				for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
+					info = &dev->mdm.info[i];
+					if (info->isdn_driver == c->driver) {
+						if (info->online)
+							isdn_tty_modem_hup(info, 1);
+					}
+				}
+				return 1;
+#ifdef CONFIG_ISDN_TTY_FAX
+			case ISDN_STAT_FAXIND:
+				if (TTY_IS_ACTIVE(info)) {
+					isdn_tty_fax_command(info, c); 
+				}
+				break;
+#endif
+#ifdef CONFIG_ISDN_AUDIO
+			case ISDN_STAT_AUDIO:
+				if (TTY_IS_ACTIVE(info)) {
+					switch(c->parm.num[0]) {
+						case ISDN_AUDIO_DTMF:
+							if (info->vonline) {
+								isdn_audio_put_dle_code(info,
+									c->parm.num[1]);
+							}
+							break;
+					}
+				}
+				break;
+#endif
+		}
+	}
+	return 0;
+}
+
+/*********************************************************************
+ Modem-Emulator-Routines
+ *********************************************************************/
+
+#define cmdchar(c) ((c>=' ')&&(c<=0x7f))
+
+/*
+ * Put a message from the AT-emulator into receive-buffer of tty,
+ * convert CR, LF, and BS to values in modem-registers 3, 4 and 5.
+ */
+void
+isdn_tty_at_cout(char *msg, modem_info * info)
+{
+	struct tty_struct *tty;
+	atemu *m = &info->emu;
+	char *p;
+	char c;
+	u_long flags;
+	struct sk_buff *skb = NULL;
+	char *sp = NULL;
+
+	if (!msg) {
+		printk(KERN_WARNING "isdn_tty: Null-Message in isdn_tty_at_cout\n");
+		return;
+	}
+	spin_lock_irqsave(&info->readlock, flags);
+	tty = info->tty;
+	if ((info->flags & ISDN_ASYNC_CLOSING) || (!tty)) {
+		spin_unlock_irqrestore(&info->readlock, flags);
+		return;
+	}
+
+	/* use queue instead of direct flip, if online and */
+	/* data is in queue or flip buffer is full */
+	if ((info->online) && (((tty->flip.count + strlen(msg)) >= TTY_FLIPBUF_SIZE) ||
+	    (!skb_queue_empty(&dev->drv[info->isdn_driver]->rpqueue[info->isdn_channel])))) {
+		skb = alloc_skb(strlen(msg), GFP_ATOMIC);
+		if (!skb) {
+			spin_unlock_irqrestore(&info->readlock, flags);
+			return;
+		}
+		sp = skb_put(skb, strlen(msg));
+#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->flip.count >= TTY_FLIPBUF_SIZE)
+				break;
+			tty_insert_flip_char(tty, c, 0);
+		}
+	}
+	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);
+		schedule_delayed_work(&tty->flip.work, 1);
+	}
+}
+
+/*
+ * 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->flags & ISDN_ASYNC_CLOSING),
+			       (!info->tty));
+#endif
+			m->mdmreg[REG_RINGCNT] = 0;
+			del_timer(&info->nc_timer);
+			info->ncarrier = 0;
+			if ((info->flags & ISDN_ASYNC_CLOSING) || (!info->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->flags & ISDN_ASYNC_CLOSING) || (!info->tty)) {
+			return;
+		}
+		tty_ldisc_flush(info->tty);
+		if ((info->flags & ISDN_ASYNC_CHECK_CD) &&
+		    (!((info->flags & ISDN_ASYNC_CALLOUT_ACTIVE) &&
+		       (info->flags & ISDN_ASYNC_CALLOUT_NOHUP)))) {
+			tty_hangup(info->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,#.*WPTS-", *p) && *p && --cnt>0) {
+		if ((*p >= '0' && *p <= '9') || ((*p == 'S') && 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))
+				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[40];
+
+#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;
+				break;
+			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++;
+                                                sprintf(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]))
+			if ((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) {
+			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);
+}