isdn_tty.c 95 KB
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/* $Id: isdn_tty.c,v 1.1.2.3 2004/02/10 01:07:13 keil Exp $
 *
 * Linux ISDN subsystem, tty functions and AT-command emulator (linklevel).
 *
 * Copyright 1994-1999  by Fritz Elfert (fritz@isdn4linux.de)
 * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */
#undef ISDN_TTY_STAT_DEBUG

#include <linux/config.h>
#include <linux/isdn.h>
#include <linux/delay.h>
#include "isdn_common.h"
#include "isdn_tty.h"
#ifdef CONFIG_ISDN_AUDIO
#include "isdn_audio.h"
#define VBUF 0x3e0
#define VBUFX (VBUF/16)
#endif

#define FIX_FILE_TRANSFER
#define	DUMMY_HAYES_AT

/* Prototypes */

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

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

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

char *isdn_tty_revision = "$Revision: 1.1.2.3 $";


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

	if (info->online) {
		if ((tty = info->tty)) {
			if (info->mcr & UART_MCR_RTS) {
				c = TTY_FLIPBUF_SIZE - tty->flip.count;
				len = skb->len
#ifdef CONFIG_ISDN_AUDIO
					+ ISDN_AUDIO_SKB_DLECOUNT(skb)
#endif
					;
				if (c >= len) {
#ifdef CONFIG_ISDN_AUDIO
					if (ISDN_AUDIO_SKB_DLECOUNT(skb))
						while (skb->len--) {
							if (*skb->data == DLE)
								tty_insert_flip_char(tty, DLE, 0);
							tty_insert_flip_char(tty, *skb->data++, 0);
					} else {
#endif
						memcpy(tty->flip.char_buf_ptr,
						       skb->data, len);
						tty->flip.count += len;
						tty->flip.char_buf_ptr += len;
						memset(tty->flip.flag_buf_ptr, 0, len);
						tty->flip.flag_buf_ptr += len;
#ifdef CONFIG_ISDN_AUDIO
					}
#endif
					if (info->emu.mdmreg[REG_CPPP] & BIT_CPPP)
						tty->flip.flag_buf_ptr[len - 1] = 0xff;
					schedule_delayed_work(&tty->flip.work, 1);
					kfree_skb(skb);
					return 1;
				}
			}
		}
	}
	return 0;
}

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

	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
		if ((midx = dev->m_idx[i]) >= 0) {
			info = &dev->mdm.info[midx];
			if (info->online) {
				r = 0;
#ifdef CONFIG_ISDN_AUDIO
				isdn_audio_eval_dtmf(info);
				if ((info->vonline & 1) && (info->emu.vpar[1]))
					isdn_audio_eval_silence(info);
#endif
				if ((tty = info->tty)) {
					if (info->mcr & UART_MCR_RTS) {
						c = TTY_FLIPBUF_SIZE - tty->flip.count;
						if (c > 0) {
							r = isdn_readbchan(info->isdn_driver, info->isdn_channel,
									   tty->flip.char_buf_ptr,
									   tty->flip.flag_buf_ptr, c, NULL);
							/* CISCO AsyncPPP Hack */
							if (!(info->emu.mdmreg[REG_CPPP] & BIT_CPPP))
								memset(tty->flip.flag_buf_ptr, 0, r);
							tty->flip.count += r;
							tty->flip.flag_buf_ptr += r;
							tty->flip.char_buf_ptr += r;
							if (r)
								schedule_delayed_work(&tty->flip.work, 1);
						}
					} else
						r = 1;
				} else
					r = 1;
				if (r) {
					info->rcvsched = 0;
					resched = 1;
				} else
					info->rcvsched = 1;
			}
		}
	}
	if (!resched)
		isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 0);
}

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

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

276
static void
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isdn_tty_cleanup_xmit(modem_info * info)
{
	skb_queue_purge(&info->xmit_queue);
#ifdef CONFIG_ISDN_AUDIO
	skb_queue_purge(&info->dtmf_queue);
#endif
}

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

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

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

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

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

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

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

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

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

#endif                          /* CONFIG_ISDN_AUDIO */

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

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

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

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

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

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

/*
 * return the usage calculated by si and layer 2 protocol
 */
563
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) {
		switch(l2) {
			case ISDN_PROTO_L2_MODEM: 
				usg = ISDN_USAGE_MODEM;
				break;
#ifdef CONFIG_ISDN_TTY_FAX
			case ISDN_PROTO_L2_FAX: 
				usg = ISDN_USAGE_FAX;
				break;
#endif
			case ISDN_PROTO_L2_TRANS: 
			default:
				usg = ISDN_USAGE_VOICE;
				break;
		}
	}
#endif
	return(usg);
}

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

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

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

	if (!info)
		return;

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

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

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

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

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

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

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

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

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

	if (!info)
		return;

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

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

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

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

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

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

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

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

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

	if (!info->tty || !info->tty->termios)
		return;
	cflag = info->tty->termios->c_cflag;

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

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

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

	info->flags |= ISDN_ASYNC_INITIALIZED;
	info->msr |= (UART_MSR_DSR | UART_MSR_CTS);
	info->send_outstanding = 0;
	return 0;
}

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

	info->flags &= ~ISDN_ASYNC_INITIALIZED;
}

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

	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_write"))
		return 0;
	/* See isdn_tty_senddown() */
	atomic_inc(&info->xmit_lock);
	while (1) {
		c = count;
		if (c > info->xmit_size - info->xmit_count)
			c = info->xmit_size - info->xmit_count;
		if (info->isdn_driver >= 0 && c > dev->drv[info->isdn_driver]->maxbufsize)
			c = dev->drv[info->isdn_driver]->maxbufsize;
		if (c <= 0)
			break;
		if ((info->online > 1)
#ifdef CONFIG_ISDN_AUDIO
		    || (info->vonline & 3)
#endif
			) {
#ifdef CONFIG_ISDN_AUDIO
			if (!info->vonline)
#endif
				isdn_tty_check_esc(buf, m->mdmreg[REG_ESC], c,
						   &(m->pluscount),
						   &(m->lastplus));
			memcpy(&(info->xmit_buf[info->xmit_count]), buf, c);
#ifdef CONFIG_ISDN_AUDIO
			if (info->vonline) {
				int cc = isdn_tty_handleDLEdown(info, m, c);
				if (info->vonline & 2) {
					if (!cc) {
						/* If DLE decoding results in zero-transmit, but
						 * c originally was non-zero, do a wakeup.
						 */
						tty_wakeup(tty);
						info->msr |= UART_MSR_CTS;
						info->lsr |= UART_LSR_TEMT;
					}
					info->xmit_count += cc;
				}
				if ((info->vonline & 3) == 1) {
					/* Do NOT handle Ctrl-Q or Ctrl-S
					 * when in full-duplex audio mode.
					 */
					if (isdn_tty_end_vrx(buf, c)) {
						info->vonline &= ~1;
#ifdef ISDN_DEBUG_MODEM_VOICE
						printk(KERN_DEBUG
						       "got !^Q/^S, send DLE-ETX,VCON on ttyI%d\n",
						       info->line);
#endif
						isdn_tty_at_cout("\020\003\r\nVCON\r\n", info);
					}
				}
			} else
			if (TTY_IS_FCLASS1(info)) {
				int cc = isdn_tty_handleDLEdown(info, m, c);
				
				if (info->vonline & 4) { /* ETX seen */
					isdn_ctrl c;

					c.command = ISDN_CMD_FAXCMD;
					c.driver = info->isdn_driver;
					c.arg = info->isdn_channel;
					c.parm.aux.cmd = ISDN_FAX_CLASS1_CTRL;
					c.parm.aux.subcmd = ETX;
					isdn_command(&c);
				}
				info->vonline = 0;
#ifdef ISDN_DEBUG_MODEM_VOICE
				printk(KERN_DEBUG "fax dle cc/c %d/%d\n", cc, c);
#endif
				info->xmit_count += cc;
			} else
#endif
				info->xmit_count += c;
		} else {
			info->msr |= UART_MSR_CTS;
			info->lsr |= UART_LSR_TEMT;
			if (info->dialing) {
				info->dialing = 0;
#ifdef ISDN_DEBUG_MODEM_HUP
				printk(KERN_DEBUG "Mhup in isdn_tty_write\n");
#endif
				isdn_tty_modem_result(RESULT_NO_CARRIER, info);
				isdn_tty_modem_hup(info, 1);
			} else
				c = isdn_tty_edit_at(buf, c, info);
		}
		buf += c;
		count -= c;
		total += c;
	}
	atomic_dec(&info->xmit_lock);
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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;
	wake_up_interruptible(&tty->write_wait);
	tty_wakeup(tty);
}

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

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

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


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

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

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

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

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

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

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

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

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

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

	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_ioctl"))
		return -ENODEV;
	if (tty->flags & (1 << TTY_IO_ERROR))
		return -EIO;
	switch (cmd) {
		case TCSBRK:   /* SVID version: non-zero arg --> no break */
#ifdef ISDN_DEBUG_MODEM_IOCTL
			printk(KERN_DEBUG "ttyI%d ioctl TCSBRK\n", info->line);
#endif
			retval = tty_check_change(tty);
			if (retval)
				return retval;
			tty_wait_until_sent(tty, 0);
			return 0;
		case TCSBRKP:  /* support for POSIX tcsendbreak() */
#ifdef ISDN_DEBUG_MODEM_IOCTL
			printk(KERN_DEBUG "ttyI%d ioctl TCSBRKP\n", info->line);
#endif
			retval = tty_check_change(tty);
			if (retval)
				return retval;
			tty_wait_until_sent(tty, 0);
			return 0;
		case TIOCGSOFTCAR:
#ifdef ISDN_DEBUG_MODEM_IOCTL
			printk(KERN_DEBUG "ttyI%d ioctl TIOCGSOFTCAR\n", info->line);
#endif
			return put_user(C_CLOCAL(tty) ? 1 : 0, (ulong __user *) arg);
		case TIOCSSOFTCAR:
#ifdef ISDN_DEBUG_MODEM_IOCTL
			printk(KERN_DEBUG "ttyI%d ioctl TIOCSSOFTCAR\n", info->line);
#endif
			if (get_user(arg, (ulong __user *) arg))
				return -EFAULT;
			tty->termios->c_cflag =
			    ((tty->termios->c_cflag & ~CLOCAL) |
			     (arg ? CLOCAL : 0));
			return 0;
		case TIOCSERGETLSR:	/* Get line status register */
#ifdef ISDN_DEBUG_MODEM_IOCTL
			printk(KERN_DEBUG "ttyI%d ioctl TIOCSERGETLSR\n", info->line);
#endif
			return isdn_tty_get_lsr_info(info, (uint __user *) arg);
		default:
#ifdef ISDN_DEBUG_MODEM_IOCTL
			printk(KERN_DEBUG "UNKNOWN ioctl 0x%08x on ttyi%d\n", cmd, info->line);
#endif
			return -ENOIOCTLCMD;
	}
	return 0;
}

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

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

/*
 * ------------------------------------------------------------
 * isdn_tty_open() and friends
 * ------------------------------------------------------------
 */
static int
isdn_tty_block_til_ready(struct tty_struct *tty, struct file *filp, modem_info * info)
{
	DECLARE_WAITQUEUE(wait, NULL);
	int do_clocal = 0;
	int retval;

	/*
	 * If the device is in the middle of being closed, then block
	 * until it's done, and then try again.
	 */
	if (tty_hung_up_p(filp) ||
	    (info->flags & ISDN_ASYNC_CLOSING)) {
		if (info->flags & ISDN_ASYNC_CLOSING)
			interruptible_sleep_on(&info->close_wait);
#ifdef MODEM_DO_RESTART
		if (info->flags & ISDN_ASYNC_HUP_NOTIFY)
			return -EAGAIN;
		else
			return -ERESTARTSYS;
#else
		return -EAGAIN;
#endif
	}
	/*
	 * If non-blocking mode is set, then make the check up front
	 * and then exit.
	 */
	if ((filp->f_flags & O_NONBLOCK) ||
	    (tty->flags & (1 << TTY_IO_ERROR))) {
		if (info->flags & ISDN_ASYNC_CALLOUT_ACTIVE)
			return -EBUSY;
		info->flags |= ISDN_ASYNC_NORMAL_ACTIVE;
		return 0;
	}
	if (info->flags & ISDN_ASYNC_CALLOUT_ACTIVE) {
		if (info->normal_termios.c_cflag & CLOCAL)
			do_clocal = 1;
	} else {
		if (tty->termios->c_cflag & CLOCAL)
			do_clocal = 1;
	}
	/*
	 * Block waiting for the carrier detect and the line to become
	 * free (i.e., not in use by the callout).  While we are in
	 * this loop, info->count is dropped by one, so that
	 * isdn_tty_close() knows when to free things.  We restore it upon
	 * exit, either normal or abnormal.
	 */
	retval = 0;
	add_wait_queue(&info->open_wait, &wait);
#ifdef ISDN_DEBUG_MODEM_OPEN
	printk(KERN_DEBUG "isdn_tty_block_til_ready before block: ttyi%d, count = %d\n",
	       info->line, info->count);
#endif
	if (!(tty_hung_up_p(filp)))
		info->count--;
	info->blocked_open++;
	while (1) {
		set_current_state(TASK_INTERRUPTIBLE);
		if (tty_hung_up_p(filp) ||
		    !(info->flags & ISDN_ASYNC_INITIALIZED)) {
#ifdef MODEM_DO_RESTART
			if (info->flags & ISDN_ASYNC_HUP_NOTIFY)
				retval = -EAGAIN;
			else
				retval = -ERESTARTSYS;
#else
			retval = -EAGAIN;
#endif
			break;
		}
		if (!(info->flags & ISDN_ASYNC_CALLOUT_ACTIVE) &&
		    !(info->flags & ISDN_ASYNC_CLOSING) &&
		    (do_clocal || (info->msr & UART_MSR_DCD))) {
			break;
		}
		if (signal_pending(current)) {
			retval = -ERESTARTSYS;
			break;
		}
#ifdef ISDN_DEBUG_MODEM_OPEN
		printk(KERN_DEBUG "isdn_tty_block_til_ready blocking: ttyi%d, count = %d\n",
		       info->line, info->count);
#endif
		schedule();
	}
	current->state = TASK_RUNNING;
	remove_wait_queue(&info->open_wait, &wait);
	if (!tty_hung_up_p(filp))
		info->count++;
	info->blocked_open--;
#ifdef ISDN_DEBUG_MODEM_OPEN
	printk(KERN_DEBUG "isdn_tty_block_til_ready after blocking: ttyi%d, count = %d\n",
	       info->line, info->count);
#endif
	if (retval)
		return retval;
	info->flags |= ISDN_ASYNC_NORMAL_ACTIVE;
	return 0;
}

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

	line = tty->index;
	if (line < 0 || line > ISDN_MAX_CHANNELS)
		return -ENODEV;
	info = &dev->mdm.info[line];
	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_open"))
		return -ENODEV;
	if (!try_module_get(info->owner)) {
		printk(KERN_WARNING "%s: cannot reserve module\n", __FUNCTION__);
		return -ENODEV;
	}
#ifdef ISDN_DEBUG_MODEM_OPEN
	printk(KERN_DEBUG "isdn_tty_open %s, count = %d\n", tty->name, 
	       info->count);
#endif
	info->count++;
	tty->driver_data = info;
	info->tty = tty;
	/*
	 * Start up serial port
	 */
	retval = isdn_tty_startup(info);
	if (retval) {
#ifdef ISDN_DEBUG_MODEM_OPEN
		printk(KERN_DEBUG "isdn_tty_open return after startup\n");
#endif
		module_put(info->owner);
		return retval;
	}
	retval = isdn_tty_block_til_ready(tty, filp, info);
	if (retval) {
#ifdef ISDN_DEBUG_MODEM_OPEN
		printk(KERN_DEBUG "isdn_tty_open return after isdn_tty_block_til_ready \n");
#endif
		module_put(info->owner);
		return retval;
	}
#ifdef ISDN_DEBUG_MODEM_OPEN
	printk(KERN_DEBUG "isdn_tty_open ttyi%d successful...\n", info->line);
#endif
	dev->modempoll++;
#ifdef ISDN_DEBUG_MODEM_OPEN
	printk(KERN_DEBUG "isdn_tty_open normal exit\n");
#endif
	return 0;
}

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

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

	tty->closing = 1;
	/*
	 * At this point we stop accepting input.  To do this, we
	 * disable the receive line status interrupts, and tell the
	 * interrupt driver to stop checking the data ready bit in the
	 * line status register.
	 */
	if (info->flags & ISDN_ASYNC_INITIALIZED) {
		tty_wait_until_sent(tty, 3000);	/* 30 seconds timeout */
		/*
		 * Before we drop DTR, make sure the UART transmitter
		 * has completely drained; this is especially
		 * important if there is a transmit FIFO!
		 */
		timeout = jiffies + HZ;
		while (!(info->lsr & UART_LSR_TEMT)) {
1724
			schedule_timeout_interruptible(20);
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