isdn_tty.c 91.2 KB
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/*
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 * Linux ISDN subsystem, tty functions and AT-command emulator (linklevel).
 *
 * Copyright 1994-1999  by Fritz Elfert (fritz@isdn4linux.de)
 * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */
#undef ISDN_TTY_STAT_DEBUG

#include <linux/isdn.h>
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#include <linux/serial.h> /* ASYNC_* flags */
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#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 */

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

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

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

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

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	tty = info->port.tty;
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	if (!tty)
		return 0;

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

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

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

	return 1;
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}

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

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

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

		r = 0;
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#ifdef CONFIG_ISDN_AUDIO
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		isdn_audio_eval_dtmf(info);
		if ((info->vonline & 1) && (info->emu.vpar[1]))
			isdn_audio_eval_silence(info);
#endif
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		tty = info->port.tty;
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		if (tty) {
			if (info->mcr & UART_MCR_RTS) {
				/* CISCO AsyncPPP Hack */
				if (!(info->emu.mdmreg[REG_CPPP] & BIT_CPPP))
					r = isdn_readbchan_tty(info->isdn_driver, info->isdn_channel, tty, 0);
				else
					r = isdn_readbchan_tty(info->isdn_driver, info->isdn_channel, tty, 1);
				if (r)
					tty_flip_buffer_push(tty);
			} else
				r = 1;
		} else
			r = 1;
		if (r) {
			info->rcvsched = 0;
			resched = 1;
		} else
			info->rcvsched = 1;
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	}
	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;
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	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]) {
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		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;
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		}
		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
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	/* Try to deliver directly via tty-buf if queue is empty */
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	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;
}

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

static void
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isdn_tty_tint(modem_info *info)
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{
	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) {
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		struct tty_struct *tty = info->port.tty;
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		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
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isdn_tty_handleDLEdown(modem_info *info, atemu *m, int len)
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{
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	unsigned char *p = &info->port.xmit_buf[info->xmit_count];
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	int count = 0;

	while (len > 0) {
		if (m->lastDLE) {
			m->lastDLE = 0;
			switch (*p) {
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			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;
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#ifdef ISDN_DEBUG_MODEM_VOICE
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				printk(KERN_DEBUG
				       "DLEdown: got DLE-DC4, send DLE-ETX on ttyI%d\n",
				       info->line);
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#endif
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				isdn_tty_at_cout("\020\003", info);
				if (!info->vonline) {
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#ifdef ISDN_DEBUG_MODEM_VOICE
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					printk(KERN_DEBUG
					       "DLEdown: send VCON on ttyI%d\n",
					       info->line);
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#endif
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					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;
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			}
		} 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
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isdn_tty_senddown(modem_info *info)
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{
	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;
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	if ((info->emu.mdmreg[REG_CTS] & BIT_CTS) != 0)
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		info->msr &= ~UART_MSR_CTS;
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	info->lsr &= ~UART_LSR_TEMT;
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	/* 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);
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	memcpy(skb_put(skb, buflen), info->port.xmit_buf, buflen);
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	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]) {
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		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;
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		}
	}
#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
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 * into the tty's buffer.
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 */
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
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isdn_tty_modem_ncarrier(modem_info *info)
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{
	if (info->ncarrier) {
		info->nc_timer.expires = jiffies + HZ;
		add_timer(&info->nc_timer);
	}
}

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

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

/* isdn_tty_dial() performs dialing of a tty an the necessary
 * setup of the lower levels before that.
 */
static void
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isdn_tty_dial(char *n, modem_info *info, atemu *m)
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{
	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
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	if ((si == 1) &&
	    (l2 != ISDN_PROTO_L2_MODEM)
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#ifdef CONFIG_ISDN_TTY_FAX
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	    && (l2 != ISDN_PROTO_L2_FAX)
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#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
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isdn_tty_modem_hup(modem_info *info, int local)
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{
	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;
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	isdn_tty_flush_buffer(info->port.tty);
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	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;
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	kfree(info->dtmf_state);
	info->dtmf_state = NULL;
	kfree(info->silence_state);
	info->silence_state = NULL;
	kfree(info->adpcms);
	info->adpcms = NULL;
	kfree(info->adpcmr);
	info->adpcmr = NULL;
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#endif
	if ((info->msr & UART_MSR_RI) &&
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	    (info->emu.mdmreg[REG_RUNG] & BIT_RUNG))
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		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;
	}
}

/*
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 * Begin of a CAPI like interface, currently used only for
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 * supplementary service (CAPI 2.0 part III)
 */
#include <linux/isdn/capicmd.h>
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#include <linux/module.h>
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int
isdn_tty_capi_facility(capi_msg *cm) {
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	return (-1); /* dummy */
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}

/* isdn_tty_suspend() tries to suspend the current tty connection
 */
static void
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isdn_tty_suspend(char *id, modem_info *info, atemu *m)
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{
	isdn_ctrl cmd;
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	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)) {
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		cmd.parm.cmsg.Length = l + 18;
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		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
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 * setup of the lower levels before that. unfortunately here is no
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 * 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
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isdn_tty_resume(char *id, modem_info *info, atemu *m)
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{
	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
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	if ((si == 1) &&
	    (l2 != ISDN_PROTO_L2_MODEM)
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#ifdef CONFIG_ISDN_TTY_FAX
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	    && (l2 != ISDN_PROTO_L2_FAX)
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#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;
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		cmd.parm.cmsg.Length = l + 18;
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		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;
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		cmd.parm.cmsg.para[2] = l + 3;
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		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);
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		cmd.command = CAPI_PUT_MESSAGE;
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		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
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isdn_tty_send_msg(modem_info *info, atemu *m, char *msg)
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{
	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
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	if ((si == 1) &&
	    (l2 != ISDN_PROTO_L2_MODEM)
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#ifdef CONFIG_ISDN_TTY_FAX
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	    && (l2 != ISDN_PROTO_L2_FAX)
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#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;
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		cmd.parm.cmsg.Length = l + 14;
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		cmd.parm.cmsg.Command = CAPI_MANUFACTURER;
		cmd.parm.cmsg.Subcommand = CAPI_REQ;
		cmd.parm.cmsg.adr.Controller = info->isdn_driver + 1;
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		cmd.parm.cmsg.para[0] = l + 1;
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		strncpy(&cmd.parm.cmsg.para[1], msg, l);
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		cmd.parm.cmsg.para[l + 1] = 0xd;
		cmd.command = CAPI_PUT_MESSAGE;
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/*		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",
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		       name, routine);
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		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
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isdn_tty_change_speed(modem_info *info)
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{
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	struct tty_port *port = &info->port;
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	uint cflag,
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		cval,
		quot;
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	int i;

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	if (!port->tty || !port->tty->termios)
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		return;
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	cflag = port->tty->termios->c_cflag;
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	quot = i = cflag & CBAUD;
	if (i & CBAUDEX) {
		i &= ~CBAUDEX;
		if (i < 1 || i > 2)
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			port->tty->termios->c_cflag &= ~CBAUDEX;
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		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;

	/* CTS flow control flag and modem status interrupts */
	if (cflag & CRTSCTS) {
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		port->flags |= ASYNC_CTS_FLOW;
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	} else
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		port->flags &= ~ASYNC_CTS_FLOW;
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	if (cflag & CLOCAL)
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		port->flags &= ~ASYNC_CHECK_CD;
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	else {
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		port->flags |= ASYNC_CHECK_CD;
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	}
}

static int
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isdn_tty_startup(modem_info *info)
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{
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	if (info->port.flags & ASYNC_INITIALIZED)
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		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;
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	if (info->port.tty)
		clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
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	/*
	 * and set the speed of the serial port
	 */
	isdn_tty_change_speed(info);

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	info->port.flags |= ASYNC_INITIALIZED;
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	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
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isdn_tty_shutdown(modem_info *info)
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{
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	if (!(info->port.flags & ASYNC_INITIALIZED))
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		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;
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	if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL)) {
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		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);
		}
	}
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	if (info->port.tty)
		set_bit(TTY_IO_ERROR, &info->port.tty->flags);
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	info->port.flags &= ~ASYNC_INITIALIZED;
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}

/* 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
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isdn_tty_write(struct tty_struct *tty, const u_char *buf, int count)
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{
	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));
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			memcpy(&info->port.xmit_buf[info->xmit_count], buf, c);
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#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
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				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;
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#ifdef ISDN_DEBUG_MODEM_VOICE
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					printk(KERN_DEBUG "fax dle cc/c %d/%d\n", cc, c);
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#endif
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					info->xmit_count += cc;
				} else
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#endif
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					info->xmit_count += c;
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		} 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);
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	if ((info->xmit_count) || !skb_queue_empty(&info->xmit_queue)) {
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		if (m->mdmreg[REG_DXMT] & BIT_DXMT) {
			isdn_tty_senddown(info);
			isdn_tty_tint(info);
		}
		isdn_timer_ctrl(ISDN_TIMER_MODEMXMIT, 1);
	}
	return total;
}

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

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

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

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

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

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

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

	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_flush_chars"))
		return;
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	if ((info->xmit_count) || !skb_queue_empty(&info->xmit_queue))
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		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
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isdn_tty_get_lsr_info(modem_info *info, uint __user *value)
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{
	u_char status;
	uint result;

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


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

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	if (isdn_tty_paranoia_check(info, tty->name, __func__))
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		return -ENODEV;
	if (tty->flags & (1 << TTY_IO_ERROR))
		return -EIO;

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

	control = info->mcr;
	status = info->msr;
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	mutex_unlock(&modem_info_mutex);
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	return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
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		| ((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);
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}

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

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	if (isdn_tty_paranoia_check(info, tty->name, __func__))
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		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

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	mutex_lock(&modem_info_mutex);
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	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);
		}
	}
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	mutex_unlock(&modem_info_mutex);
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	return 0;
}

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

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

	if (!old_termios)
		isdn_tty_change_speed(info);
	else {
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		if (tty->termios->c_cflag == old_termios->c_cflag &&
		    tty->termios->c_ispeed == old_termios->c_ispeed &&
		    tty->termios->c_ospeed == old_termios->c_ospeed)
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			return;
		isdn_tty_change_speed(info);
		if ((old_termios->c_cflag & CRTSCTS) &&
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		    !(tty->termios->c_cflag & CRTSCTS))
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			tty->hw_stopped = 0;
	}
}

/*
 * ------------------------------------------------------------
 * isdn_tty_open() and friends
 * ------------------------------------------------------------
 */
static int
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isdn_tty_block_til_ready(struct tty_struct *tty, struct file *filp, modem_info *info)
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{
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	struct tty_port *port = &info->port;
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	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) ||
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	    (port->flags & ASYNC_CLOSING)) {
		if (port->flags & ASYNC_CLOSING)
			interruptible_sleep_on(&port->close_wait);
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#ifdef MODEM_DO_RESTART
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		if (port->flags & ASYNC_HUP_NOTIFY)
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			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))) {
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		port->flags |= ASYNC_NORMAL_ACTIVE;
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		return 0;
	}
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	if (tty->termios->c_cflag & CLOCAL)
		do_clocal = 1;
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	/*
	 * 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;
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	add_wait_queue(&port->open_wait, &wait);
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#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)))
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		port->count--;
	port->blocked_open++;
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	while (1) {
		set_current_state(TASK_INTERRUPTIBLE);
		if (tty_hung_up_p(filp) ||
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		    !(port->flags & ASYNC_INITIALIZED)) {
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#ifdef MODEM_DO_RESTART
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			if (port->flags & ASYNC_HUP_NOTIFY)
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				retval = -EAGAIN;
			else
				retval = -ERESTARTSYS;
#else
			retval = -EAGAIN;
#endif
			break;
		}
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		if (!(port->flags & ASYNC_CLOSING) &&
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		    (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",
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		       info->line, port->count);
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#endif
		schedule();
	}
	current->state = TASK_RUNNING;
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	remove_wait_queue(&port->open_wait, &wait);
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	if (!tty_hung_up_p(filp))
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		port->count++;
	port->blocked_open--;
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#ifdef ISDN_DEBUG_MODEM_OPEN
	printk(KERN_DEBUG "isdn_tty_block_til_ready after blocking: ttyi%d, count = %d\n",
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	       info->line, port->count);
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#endif
	if (retval)
		return retval;
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	port->flags |= ASYNC_NORMAL_ACTIVE;
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	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)
{
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	struct tty_port *port;
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	modem_info *info;
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	int retval;
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	info = &dev->mdm.info[tty->index];
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	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_open"))
		return -ENODEV;
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	port = &info->port;
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#ifdef ISDN_DEBUG_MODEM_OPEN
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	printk(KERN_DEBUG "isdn_tty_open %s, count = %d\n", tty->name,
1602
	       port->count);
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#endif
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	port->count++;
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	tty->driver_data = info;
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	port->tty = tty;
	tty->port = port;
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	/*
	 * Start up serial port
	 */
	retval = isdn_tty_startup(info);
	if (retval) {
#ifdef ISDN_DEBUG_MODEM_OPEN
		printk(KERN_DEBUG "isdn_tty_open return after startup\n");
#endif
		return retval;
	}
	retval = 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
		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;
1639
	struct tty_port *port = &info->port;
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	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;
	}
1650
	if ((tty->count == 1) && (port->count != 1)) {
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		/*
		 * 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, "
1659 1660
		       "info->count is %d\n", port->count);
		port->count = 1;
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	}
1662
	if (--port->count < 0) {
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		printk(KERN_ERR "isdn_tty_close: bad port count for ttyi%d: %d\n",
1664 1665
		       info->line, port->count);
		port->count = 0;
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	}
1667
	if (port->count) {
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#ifdef ISDN_DEBUG_MODEM_OPEN
		printk(KERN_DEBUG "isdn_tty_close after info->count != 0\n");
#endif
		return;
	}
1673
	port->flags |= ASYNC_CLOSING;
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	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.
	 */
1682
	if (port->flags & ASYNC_INITIALIZED) {
1683
		tty_wait_until_sent_from_close(tty, 3000);	/* 30 seconds timeout */
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		/*
		 * 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)) {
1691
			schedule_timeout_interruptible(20);
1692
			if (time_after(jiffies, timeout))
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				break;
		}
	}
	dev->modempoll--;
	isdn_tty_shutdown(info);
1698
	isdn_tty_flush_buffer(tty);
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	tty_ldisc_flush(tty);
1700
	port->tty = NULL;
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	info->ncarrier = 0;
1702 1703

	tty_port_close_end(port, tty);
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#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;
1716
	struct tty_port *port = &info->port;
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	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_hangup"))
		return;
	isdn_tty_shutdown(info);
1721 1722 1723 1724
	port->count = 0;
	port->flags &= ~ASYNC_NORMAL_ACTIVE;
	port->tty = NULL;
	wake_up_interruptible(&port->open_wait);
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}

/* This routine initializes all emulator-data.
 */
static void
1730
isdn_tty_reset_profile(atemu *m)
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{
	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
1760
isdn_tty_modem_reset_vpar(atemu *m)
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{
	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
1773
isdn_tty_modem_reset_faxpar(modem_info *info)
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{
	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
1806
isdn_tty_modem_reset_regs(modem_info *info, int force)
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{
	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
1825
modem_write_profile(atemu *m)
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{
	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);
}

1834
static const struct tty_operations modem_ops = {
1835
	.open = isdn_tty_open,
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	.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->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;
1869
	m->tty_modem->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
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	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
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		tty_port_init(&info->port);
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		spin_lock_init(&info->readlock);
		sprintf(info->last_cause, "0000");
		sprintf(info->last_num, "none");
		info->last_dir = 0;
		info->last_lhup = 1;
		info->last_l2 = -1;
		info->last_si = 0;
		isdn_tty_reset_profile(&info->emu);
		isdn_tty_modem_reset_regs(info, 1);
		info->magic = ISDN_ASYNC_MAGIC;
		info->line = i;
		info->x_char = 0;
		info->isdn_driver = -1;
		info->isdn_channel = -1;
		info->drv_index = -1;
		info->xmit_size = ISDN_SERIAL_XMIT_SIZE;
		init_timer(&info->nc_timer);
		info->nc_timer.function = isdn_tty_modem_do_ncarrier;
		info->nc_timer.data = (unsigned long) info;
		skb_queue_head_init(&info->xmit_queue);
#ifdef CONFIG_ISDN_AUDIO
		skb_queue_head_init(&info->dtmf_queue);
#endif
1910 1911 1912
		info->port.xmit_buf = kmalloc(ISDN_SERIAL_XMIT_MAX + 5,
				GFP_KERNEL);
		if (!info->port.xmit_buf) {
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			printk(KERN_ERR "Could not allocate modem xmit-buffer\n");
			retval = -ENOMEM;
			goto err_unregister;
		}
		/* Make room for T.70 header */
1918
		info->port.xmit_buf += 4;
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	}
	return 0;
err_unregister:
	for (i--; i >= 0; i--) {
		info = &m->info[i];
#ifdef CONFIG_ISDN_TTY_FAX
		kfree(info->fax);
#endif
1927
		kfree(info->port.xmit_buf - 4);
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	}
	tty_unregister_driver(m->tty_modem);
1930
err:
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	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
1948
		kfree(info->port.xmit_buf - 4);
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	}
	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
2000 2001
		printk(KERN_DEBUG "m_fi: mmsn=%s -> tmp=%d\n",
		       isdn_map_eaz2msn(emu->msn, di), tmp);
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#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];

2050
		if (info->port.count == 0)
2051
			continue;
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		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,
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			       info->port.flags, info->isdn_driver,
			       info->isdn_channel, dev->usage[idx]);
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#endif
			if (
#ifndef FIX_FILE_TRANSFER
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				(info->port.flags & ASYNC_NORMAL_ACTIVE) &&
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#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;
2078
					dev->usage[idx] |= isdn_calc_usage(si1, info->emu.mdmreg[REG_L2PROT]);
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					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,
2098 2099
	       ((dev->drv[di]->flags & DRV_FLAG_REJBUS) && (wret != 2)) ? "rejected" : "ignored");
	return (wret == 2) ? 3 : 0;
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}

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#define TTY_IS_ACTIVE(info)	(info->port.flags & ASYNC_NORMAL_ACTIVE)
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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) {
2116 2117 2118 2119 2120 2121 2122 2123
		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:
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#ifdef ISDN_TTY_STAT_DEBUG
2125
			printk(KERN_DEBUG "tty_STAT_BSENT ttyI%d\n", info->line);
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#endif
2127 2128 2129 2130 2131 2132 2133
			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);
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				return 1;
2135 2136 2137
			}
			break;
		case ISDN_STAT_CAUSE:
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#ifdef ISDN_TTY_STAT_DEBUG
2139 2140 2141 2142 2143 2144
			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:
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#ifdef ISDN_TTY_STAT_DEBUG
2146
			printk(KERN_DEBUG "tty_STAT_DISPLAY ttyI%d\n", info->line);
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#endif
2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164
			/* 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;
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				}
2166 2167 2168
			}
			break;
		case ISDN_STAT_DHUP:
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#ifdef ISDN_TTY_STAT_DEBUG
2170
			printk(KERN_DEBUG "tty_STAT_DHUP ttyI%d\n", info->line);
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#endif
2172 2173 2174 2175 2176 2177
			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;
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#ifdef ISDN_DEBUG_MODEM_HUP
2179
				printk(KERN_DEBUG "Mhup in ISDN_STAT_DHUP\n");
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#endif
2181 2182 2183 2184 2185
				isdn_tty_modem_hup(info, 0);
				return 1;
			}
			break;
		case ISDN_STAT_BCONN:
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#ifdef ISDN_TTY_STAT_DEBUG
2187 2188 2189 2190 2191 2192
			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
			 */
2193
			if (info->port.blocked_open &&
2194
			    (info->emu.mdmreg[REG_DCD] & BIT_DCD)) {
2195
				wake_up_interruptible(&info->port.open_wait);
2196
			}
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2198 2199 2200 2201 2202
			/* Schedule CONNECT-Message to any tty
			 * waiting for it and
			 * set DCD-bit of its modem-status.
			 */
			if (TTY_IS_ACTIVE(info) ||
2203 2204
			    (info->port.blocked_open &&
			     (info->emu.mdmreg[REG_DCD] & BIT_DCD))) {
2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218
				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);
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				}
2220 2221 2222 2223 2224 2225
				if (USG_VOICE(dev->usage[i]))
					isdn_tty_modem_result(RESULT_VCON, info);
				return 1;
			}
			break;
		case ISDN_STAT_BHUP:
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#ifdef ISDN_TTY_STAT_DEBUG
2227
			printk(KERN_DEBUG "tty_STAT_BHUP ttyI%d\n", info->line);
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#endif
2229
			if (TTY_IS_ACTIVE(info)) {
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#ifdef ISDN_DEBUG_MODEM_HUP
2231
				printk(KERN_DEBUG "Mhup in ISDN_STAT_BHUP\n");
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#endif
2233 2234 2235 2236 2237
				isdn_tty_modem_hup(info, 0);
				return 1;
			}
			break;
		case ISDN_STAT_NODCH:
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#ifdef ISDN_TTY_STAT_DEBUG
2239 2240 2241 2242 2243 2244 2245 2246 2247
			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);
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				}
2249 2250 2251 2252 2253
				isdn_tty_modem_hup(info, 0);
				return 1;
			}
			break;
		case ISDN_STAT_UNLOAD:
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#ifdef ISDN_TTY_STAT_DEBUG
2255
			printk(KERN_DEBUG "tty_STAT_UNLOAD ttyI%d\n", info->line);
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#endif
2257 2258 2259 2260 2261
			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);
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				}
2263 2264
			}
			return 1;
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#ifdef CONFIG_ISDN_TTY_FAX
2266 2267 2268 2269 2270
		case ISDN_STAT_FAXIND:
			if (TTY_IS_ACTIVE(info)) {
				isdn_tty_fax_command(info, c);
			}
			break;
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#endif
#ifdef CONFIG_ISDN_AUDIO
2273 2274 2275 2276 2277 2278
		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,
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									c->parm.num[1]);
					}
2281
					break;
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				}
2283 2284
			}
			break;
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#endif
		}
	}
	return 0;
}

/*********************************************************************
 Modem-Emulator-Routines
2293
*********************************************************************/
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2295
#define cmdchar(c) ((c >= ' ') && (c <= 0x7f))
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/*
 * 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
2302
isdn_tty_at_cout(char *msg, modem_info *info)
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{
	struct tty_struct *tty;
	atemu *m = &info->emu;
	char *p;
	char c;
	u_long flags;
	struct sk_buff *skb = NULL;
	char *sp = NULL;
2311
	int l;
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	if (!msg) {
		printk(KERN_WARNING "isdn_tty: Null-Message in isdn_tty_at_cout\n");
		return;
	}
2317 2318 2319

	l = strlen(msg);

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	spin_lock_irqsave(&info->readlock, flags);
2321
	tty = info->port.tty;
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	if ((info->port.flags & ASYNC_CLOSING) || (!tty)) {
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		spin_unlock_irqrestore(&info->readlock, flags);
		return;
	}

2327 2328
	/* use queue instead of direct, if online and */
	/* data is in queue or buffer is full */
2329
	if (info->online && ((tty_buffer_request_room(tty, l) < l) ||
2330
			     !skb_queue_empty(&dev->drv[info->isdn_driver]->rpqueue[info->isdn_channel]))) {
2331
		skb = alloc_skb(l, GFP_ATOMIC);
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		if (!skb) {
			spin_unlock_irqrestore(&info->readlock, flags);
			return;
		}
2336
		sp = skb_put(skb, l);
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#ifdef CONFIG_ISDN_AUDIO
		ISDN_AUDIO_SKB_DLECOUNT(skb) = 0;
		ISDN_AUDIO_SKB_LOCK(skb) = 0;
#endif
	}

	for (p = msg; *p; p++) {
		switch (*p) {
2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355
		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;
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		}
		if (skb) {
			*sp++ = c;
		} else {
2360
			if (tty_insert_flip_char(tty, c, TTY_NORMAL) == 0)
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				break;
		}
	}
	if (skb) {
		__skb_queue_tail(&dev->drv[info->isdn_driver]->rpqueue[info->isdn_channel], skb);
		dev->drv[info->isdn_driver]->rcvcount[info->isdn_channel] += skb->len;
		spin_unlock_irqrestore(&info->readlock, flags);
		/* Schedule dequeuing */
2369
		if (dev->modempoll && info->rcvsched)
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			isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 1);

	} else {
		spin_unlock_irqrestore(&info->readlock, flags);
2374
		tty_flip_buffer_push(tty);
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	}
}

/*
 * Perform ATH Hangup
 */
static void
2382
isdn_tty_on_hook(modem_info *info)
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{
	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");
}

2398 2399
#define PLUSWAIT1 (HZ / 2)      /* 0.5 sec. */
#define PLUSWAIT2 (HZ * 3 / 2)  /* 1.5 sec */
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/*
 * 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
2413
isdn_tty_check_esc(const u_char *p, u_char plus, int count, int *pluscount,
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2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452
		   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
2453
isdn_tty_modem_result(int code, modem_info *info)
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{
	atemu *m = &info->emu;
	static char *msg[] =
2457 2458 2459 2460
		{"OK", "CONNECT", "RING", "NO CARRIER", "ERROR",
		 "CONNECT 64000", "NO DIALTONE", "BUSY", "NO ANSWER",
		 "RINGING", "NO MSN/EAZ", "VCON", "RUNG"};
	char s[ISDN_MSNLEN + 10];
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	switch (code) {
2463 2464 2465 2466 2467 2468 2469
	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:
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#ifdef ISDN_DEBUG_MODEM_HUP
2471
		printk(KERN_DEBUG "modem_result: NO CARRIER %d %d\n",
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		       (info->port.flags & ASYNC_CLOSING),
2473
		       (!info->port.tty));
2474 2475 2476 2477
#endif
		m->mdmreg[REG_RINGCNT] = 0;
		del_timer(&info->nc_timer);
		info->ncarrier = 0;
2478
		if ((info->port.flags & ASYNC_CLOSING) || (!info->port.tty))
2479
			return;
2480

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2481
#ifdef CONFIG_ISDN_AUDIO
2482
		if (info->vonline & 1) {
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#ifdef ISDN_DEBUG_MODEM_VOICE
2484 2485
			printk(KERN_DEBUG "res3: send DLE-ETX on ttyI%d\n",
			       info->line);
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#endif
2487 2488 2489 2490
			/* voice-recording, add DLE-ETX */
			isdn_tty_at_cout("\020\003", info);
		}
		if (info->vonline & 2) {
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#ifdef ISDN_DEBUG_MODEM_VOICE
2492 2493
			printk(KERN_DEBUG "res3: send DLE-DC4 on ttyI%d\n",
			       info->line);
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#endif
2495 2496 2497
			/* voice-playing, add DLE-DC4 */
			isdn_tty_at_cout("\020\024", info);
		}
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#endif
2499 2500 2501 2502 2503 2504 2505 2506
		break;
	case RESULT_CONNECT:
	case RESULT_CONNECT64000:
		sprintf(info->last_cause, "0000");
		if (!info->online)
			info->online = 2;
		break;
	case RESULT_VCON:
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#ifdef ISDN_DEBUG_MODEM_VOICE
2508 2509
		printk(KERN_DEBUG "res3: send VCON on ttyI%d\n",
		       info->line);
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#endif
2511 2512 2513 2514 2515
		sprintf(info->last_cause, "0000");
		if (!info->online)
			info->online = 1;
		break;
	} /* switch (code) */
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	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) {
2525 2526
				/* return if "show RUNG" and ringcounter>1 */
				if ((m->mdmreg[REG_RUNG] & BIT_RUNG) &&
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				    (m->mdmreg[REG_RINGCNT] > 1))
2528 2529 2530 2531 2532 2533 2534 2535 2536 2537
					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);
					}
				}
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2538 2539 2540 2541
			}
			isdn_tty_at_cout("\r\n", info);
			isdn_tty_at_cout(msg[code], info);
			switch (code) {
2542 2543 2544 2545 2546
			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);
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					break;
2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564
				}
				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);
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					}
2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585
				}
				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);
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					break;
2587 2588
				case ISDN_PROTO_L2_HDLC:
					isdn_tty_at_cout("/HDLC", info);
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					break;
2590 2591 2592 2593 2594 2595 2596 2597
				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);
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					break;
2599 2600 2601 2602 2603 2604 2605
				}
				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;
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			}
			isdn_tty_at_cout("\r\n", info);
		}
	}
	if (code == RESULT_NO_CARRIER) {
2611
		if ((info->port.flags & ASYNC_CLOSING) || (!info->port.tty))
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			return;
2613

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		if (info->port.flags & ASYNC_CHECK_CD)
2615
			tty_hangup(info->port.tty);
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	}
}


/*
 * Display a modem-register-value.
 */
static void
2624
isdn_tty_show_profile(int ridx, modem_info *info)
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{
	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] == ':')) &&
2643
	       (limit--))
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		*n++ = *p[0]++;
	*n = '\0';
}

/*
 * Get phone-number from modem-commandbuffer
 */
static void
2652
isdn_tty_getdial(char *p, char *q, int cnt)
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{
	int first = 1;
	int limit = ISDN_MSNLEN - 1;	/* MUST match the size of interface var to avoid
2656
					   buffer overflow */
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2658
	while (strchr(" 0123456789,#.*WPTSR-", *p) && *p && --cnt > 0) {
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		if ((*p >= '0' && *p <= '9') || ((*p == 'S') && first) ||
2660
		    ((*p == 'R') && first) ||
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		    (*p == '*') || (*p == '#')) {
			*q++ = *p;
			limit--;
		}
2665
		if (!limit)
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			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
2677
isdn_tty_report(modem_info *info)
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{
	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) {
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	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;
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	}
	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) {
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	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;
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	}
	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
2755
isdn_tty_cmd_ATand(char **p, modem_info *info)
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{
	atemu *m = &info->emu;
	int i;
	char rb[100];

#define MAXRB (sizeof(rb) - 1)

	switch (*p[0]) {
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	case 'B':
		/* &B - Set Buffersize */
		p[0]++;
		i = isdn_getnum(p);
		if ((i < 0) || (i > ISDN_SERIAL_XMIT_MAX))
			PARSE_ERROR1;
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#ifdef CONFIG_ISDN_AUDIO
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		if ((m->mdmreg[REG_SI1] & 1) && (i > VBUF))
			PARSE_ERROR1;
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#endif
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		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;
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			break;
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		case 1:
			m->mdmreg[REG_DCD] |= BIT_DCD;
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			break;
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		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;
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			break;
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		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;
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			break;
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		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;
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#ifdef DUMMY_HAYES_AT
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	case 'K':
		/* only for be compilant with common scripts */
		/* &K Flowcontrol - no function */
		p[0]++;
		isdn_getnum(p);
		break;
#endif
	case 'L':
		/* &L -Set Numbers to listen on */
		p[0]++;
		i = 0;
		while (*p[0] && (strchr("0123456789,-*[]?;", *p[0])) &&
		       (i < ISDN_LMSNLEN - 1))
			m->lmsn[i++] = *p[0]++;
		m->lmsn[i] = '\0';
		break;
	case 'R':
		/* &R - Set V.110 bitrate adaption */
		p[0]++;
		i = isdn_getnum(p);
		switch (i) {
		case 0:
			/* Switch off V.110, back to X.75 */
			m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
			m->mdmreg[REG_SI2] = 0;
			info->xmit_size = m->mdmreg[REG_PSIZE] * 16;
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			break;
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		case 9600:
			m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_V11096;
			m->mdmreg[REG_SI2] = 197;
			info->xmit_size = m->mdmreg[REG_PSIZE] * 16 / 10;
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			break;
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		case 19200:
			m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_V11019;
			m->mdmreg[REG_SI2] = 199;
			info->xmit_size = m->mdmreg[REG_PSIZE] * 16 / 10;
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			break;
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		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;
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			break;
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		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':
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			p[0]++;
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			modem_write_profile(m);
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			break;
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		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;
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			break;
		default:
			PARSE_ERROR1;
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		}
		break;
	default:
		PARSE_ERROR1;
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	}
	return 0;
}

static int
2954
isdn_tty_check_ats(int mreg, int mval, modem_info *info, atemu *m)
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{
	/* Some plausibility checks */
	switch (mreg) {
2958 2959 2960 2961 2962 2963 2964
	case REG_L2PROT:
		if (mval > ISDN_PROTO_L2_MAX)
			return 1;
		break;
	case REG_PSIZE:
		if ((mval * 16) > ISDN_SERIAL_XMIT_MAX)
			return 1;
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#ifdef CONFIG_ISDN_AUDIO
2966
		if ((m->mdmreg[REG_SI1] & 1) && (mval > VBUFX))
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			return 1;
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#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;
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	}
	return 0;
}

/*
 * Perform ATS command
 */
static int
2990
isdn_tty_cmd_ATS(char **p, modem_info *info)
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{
	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]) {
3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017
	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]) {
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		case '=':
			p[0]++;
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			bval = isdn_getnum(p);
			if (bval < 0 || bval > 1)
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				PARSE_ERROR1;
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			if (bval)
				mval = m->mdmreg[mreg] | (1 << bitpos);
			else
				mval = m->mdmreg[mreg] & ~(1 << bitpos);
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			if (isdn_tty_check_ats(mreg, mval, info, m))
				PARSE_ERROR1;
			m->mdmreg[mreg] = mval;
			break;
		case '?':
			p[0]++;
3033 3034 3035
			isdn_tty_at_cout("\r\n", info);
			isdn_tty_at_cout((m->mdmreg[mreg] & (1 << bitpos)) ? "1" : "0",
					 info);
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			break;
		default:
			PARSE_ERROR1;
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		}
		break;
	case '?':
		p[0]++;
		isdn_tty_show_profile(mreg, info);
		break;
	default:
		PARSE_ERROR1;
		break;
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	}
	return 0;
}

/*
 * Perform ATA command
 */
static void
3056
isdn_tty_cmd_ATA(modem_info *info)
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{
	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
3110
isdn_tty_cmd_PLUSF(char **p, modem_info *info)
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{
	atemu *m = &info->emu;
	char rs[20];

	if (!strncmp(p[0], "CLASS", 5)) {
		p[0] += 5;
		switch (*p[0]) {
3118 3119 3120 3121
		case '?':
			p[0]++;
			sprintf(rs, "\r\n%d",
				(m->mdmreg[REG_SI1] & 1) ? 8 : 0);
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#ifdef CONFIG_ISDN_TTY_FAX
3123 3124 3125 3126
			if (TTY_IS_FCLASS2(info))
				sprintf(rs, "\r\n2");
			else if (TTY_IS_FCLASS1(info))
				sprintf(rs, "\r\n1");
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#endif
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			isdn_tty_at_cout(rs, info);
			break;
		case '=':
			p[0]++;
			switch (*p[0]) {
			case '0':
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				p[0]++;
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				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;
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#ifdef CONFIG_ISDN_TTY_FAX
3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163
			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;
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3164
#endif
3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175
			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,");
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3176
#ifdef CONFIG_ISDN_TTY_FAX
3177 3178 3179 3180 3181 3182 3183 3184 3185
				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);
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3186 3187 3188
				break;
			default:
				PARSE_ERROR1;
3189 3190 3191 3192
			}
			break;
		default:
			PARSE_ERROR1;
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		}
		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
3207
isdn_tty_cmd_PLUSV(char **p, modem_info *info)
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{
	atemu *m = &info->emu;
	isdn_ctrl cmd;
	static char *vcmd[] =
3212
		{"NH", "IP", "LS", "RX", "SD", "SM", "TX", "DD", NULL};
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	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) {
3227 3228 3229 3230 3231 3232 3233 3234 3235
	case 0:
		/* AT+VNH - Auto hangup feature */
		switch (*p[0]) {
		case '?':
			p[0]++;
			isdn_tty_at_cout("\r\n1", info);
			break;
		case '=':
			p[0]++;
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3236
			switch (*p[0]) {
3237 3238 3239 3240 3241 3242 3243 3244 3245
			case '1':
				p[0]++;
				break;
			case '?':
				p[0]++;
				isdn_tty_at_cout("\r\n1", info);
				break;
			default:
				PARSE_ERROR1;
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3246 3247
			}
			break;
3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262
		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);
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			break;
3264 3265
		case '=':
			p[0]++;
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3266
			switch (*p[0]) {
3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279
			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:
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3280 3281
				PARSE_ERROR1;
			}
3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308
			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");
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3309 3310
				PARSE_ERROR1;
			}
3311
		}
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3312
#ifdef ISDN_DEBUG_AT
3313
		printk(KERN_DEBUG "AT: +VRX\n");
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3314
#endif
3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327
		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);
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3328
			break;
3329 3330 3331 3332 3333
		case '=':
			p[0]++;
			if ((*p[0] >= '0') && (*p[0] <= '9')) {
				par1 = isdn_getnum(p);
				if ((par1 < 0) || (par1 > 31))
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3334
					PARSE_ERROR1;
3335
				if (*p[0] != ',')
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3336
					PARSE_ERROR1;
3337 3338 3339 3340 3341 3342 3343 3344 3345
				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] == '?') {
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3346
					p[0]++;
3347 3348
					isdn_tty_at_cout("\r\n<0-31>,<0-255>",
							 info);
L
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3349
					break;
3350
				} else
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3351 3352
					PARSE_ERROR1;
			break;
3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393
		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:
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				PARSE_ERROR1;
			}
3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417
			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");
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3418 3419
				PARSE_ERROR1;
			}
3420
		}
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3421
#ifdef ISDN_DEBUG_AT
3422
		printk(KERN_DEBUG "AT: +VTX\n");
L
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3423
#endif
3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437
		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);
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3438
			break;
3439 3440 3441 3442 3443 3444 3445 3446 3447
		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] != ',')
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3448
					PARSE_ERROR1;
3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466
				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);
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3467
					break;
3468
				} else
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3469 3470 3471 3472
					PARSE_ERROR1;
			break;
		default:
			PARSE_ERROR1;
3473 3474 3475 3476
		}
		break;
	default:
		PARSE_ERROR1;
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3477 3478 3479 3480 3481 3482 3483 3484 3485
	}
	return 0;
}
#endif                          /* CONFIG_ISDN_AUDIO */

/*
 * Parse and perform an AT-command-line.
 */
static void
3486
isdn_tty_parse_at(modem_info *info)
L
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3487 3488 3489
{
	atemu *m = &info->emu;
	char *p;
3490
	char ds[ISDN_MSNLEN];
L
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3491 3492 3493 3494 3495 3496

#ifdef ISDN_DEBUG_AT
	printk(KERN_DEBUG "AT: '%s'\n", m->mdmcmd);
#endif
	for (p = &m->mdmcmd[2]; *p;) {
		switch (*p) {
3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528
		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;
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3529
				break;
3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541
			case 1:
				m->mdmreg[REG_ECHO] |= BIT_ECHO;
				break;
			default:
				PARSE_ERROR;
			}
			break;
		case 'H':
			/* H - On/Off-hook */
			p++;
			switch (*p) {
			case '0':
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3542
				p++;
3543
				isdn_tty_on_hook(info);
L
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3544
				break;
3545
			case '1':
L
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3546
				p++;
3547
				isdn_tty_off_hook();
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3548
				break;
3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560
			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':
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3561 3562
				p++;
				break;
3563
			case '2':
L
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3564
				p++;
3565
				isdn_tty_report(info);
L
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3566
				break;
3567
			case '3':
L
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3568
				p++;
3569 3570
				snprintf(ds, sizeof(ds), "\r\n%d", info->emu.charge);
				isdn_tty_at_cout(ds, info);
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3571
				break;
3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582
			default:;
			}
			break;
#ifdef DUMMY_HAYES_AT
		case 'L':
		case 'M':
			/* only for be compilant with common scripts */
			/* no function */
			p++;
			isdn_getnum(&p);
			break;
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3583
#endif
3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610
		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))
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				return;
3612 3613 3614 3615 3616 3617 3618 3619 3620 3621
			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;
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3622
				break;
3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640
			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':
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3641
				p++;
3642
				if (isdn_tty_cmd_PLUSF(&p, info))
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3643 3644 3645
					return;
				break;
			case 'V':
3646 3647 3648
				if ((!(m->mdmreg[REG_SI1] & 1)) ||
				    (m->mdmreg[REG_L2PROT] == ISDN_PROTO_L2_MODEM))
					PARSE_ERROR;
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3649
				p++;
3650 3651
				if (isdn_tty_cmd_PLUSV(&p, info))
					return;
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3652
				break;
3653 3654
#endif                          /* CONFIG_ISDN_AUDIO */
			case 'S':	/* SUSPEND */
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3655
				p++;
3656 3657
				isdn_tty_get_msnstr(ds, &p);
				isdn_tty_suspend(ds, info, m);
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3658
				break;
3659
			case 'R':	/* RESUME */
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3660
				p++;
3661 3662
				isdn_tty_get_msnstr(ds, &p);
				isdn_tty_resume(ds, info, m);
L
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3663
				break;
3664
			case 'M':	/* MESSAGE */
L
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3665
				p++;
3666
				isdn_tty_send_msg(info, m, p);
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3667 3668 3669
				break;
			default:
				PARSE_ERROR;
3670 3671 3672 3673 3674 3675 3676 3677 3678
			}
			break;
		case '&':
			p++;
			if (isdn_tty_cmd_ATand(&p, info))
				return;
			break;
		default:
			PARSE_ERROR;
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3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689
		}
	}
#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.
 */
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#define my_toupper(c) (((c >= 'a') && (c <= 'z')) ? (c & 0xdf) : c)
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/*
 * Perform line-editing of AT-commands
 *
 * Parameters:
 *   p        inputbuffer
 *   count    length of buffer
 *   channel  index to line (minor-device)
 */
static int
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isdn_tty_edit_at(const char *p, int count, modem_info *info)
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{
	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) {
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				case 1:
					if (c == 'T') {
						m->mdmcmd[m->mdmcmdl] = c;
						m->mdmcmd[++m->mdmcmdl] = 0;
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						break;
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					} else
						m->mdmcmdl = 0;
					/* Fall through, check for 'A' */
				case 0:
					if (c == 'A') {
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						m->mdmcmd[m->mdmcmdl] = c;
						m->mdmcmd[++m->mdmcmdl] = 0;
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					}
					break;
				default:
					m->mdmcmd[m->mdmcmdl] = c;
					m->mdmcmd[++m->mdmcmdl] = 0;
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				}
			}
		}
	}
	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++)
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		if (USG_MODEM(dev->usage[i]) && (midx = dev->m_idx[i]) >= 0) {
			modem_info *info = &dev->mdm.info[midx];
			if (info->online) {
				ton = 1;
				if ((info->emu.pluscount == 3) &&
				    time_after(jiffies,
					    info->emu.lastplus + PLUSWAIT2)) {
					info->emu.pluscount = 0;
					info->online = 0;
					isdn_tty_modem_result(RESULT_OK, info);
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				}
			}
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		}
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	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];
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		if (!info->dialing)
			continue;
		if (info->emu.carrierwait++ > info->emu.mdmreg[REG_WAITC]) {
			info->dialing = 0;
			isdn_tty_modem_result(RESULT_NO_CARRIER, info);
			isdn_tty_modem_hup(info, 1);
		} else
			ton = 1;
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	}
	isdn_timer_ctrl(ISDN_TIMER_CARRIER, ton);
}
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