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isdn_tty.c

/* $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/isdn.h>
#include <linux/delay.h>
#include <linux/smp_lock.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;
      char last;

      if (info->online) {
            if ((tty = info->tty)) {
                  if (info->mcr & UART_MCR_RTS) {
                        len = skb->len
#ifdef CONFIG_ISDN_AUDIO
                              + ISDN_AUDIO_SKB_DLECOUNT(skb)
#endif
                              ;

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

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

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

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

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

      if (!skb)
            return;
      len = skb->len;
      if ((slen = isdn_writebuf_skb_stub(info->isdn_driver,
                                 info->isdn_channel, 1, skb)) == len) {
            struct tty_struct *tty = info->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 buffer.
 */
static void
isdn_tty_modem_do_ncarrier(unsigned long data)
{
      modem_info *info = (modem_info *) data;
      isdn_tty_modem_result(RESULT_NO_CARRIER, info);
}

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

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

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

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

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

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

      if (!info)
            return;

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

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

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

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

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

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

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

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

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

      if (!info)
            return;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

      info->flags &= ~ISDN_ASYNC_INITIALIZED;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


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

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

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

      control = info->mcr;
      status = info->msr;
      unlock_kernel();
      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, __func__))
            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

      lock_kernel();
      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);
            }
      }
      unlock_kernel();
      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 TIOCSERGETLSR:     /* Get line status register */
#ifdef ISDN_DEBUG_MODEM_IOCTL
                  printk(KERN_DEBUG "ttyI%d ioctl TIOCSERGETLSR\n", info->line);
#endif
                  return isdn_tty_get_lsr_info(info, (uint __user *) arg);
            default:
#ifdef ISDN_DEBUG_MODEM_IOCTL
                  printk(KERN_DEBUG "UNKNOWN ioctl 0x%08x on ttyi%d\n", cmd, info->line);
#endif
                  return -ENOIOCTLCMD;
      }
      return 0;
}

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

      if (!old_termios)
            isdn_tty_change_speed(info);
      else {
            if (tty->termios->c_cflag == old_termios->c_cflag &&
                tty->termios->c_ispeed == old_termios->c_ispeed &&
                tty->termios->c_ospeed == old_termios->c_ospeed)
                  return;
            isdn_tty_change_speed(info);
            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", __func__);
            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
            module_put(info->owner);
            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)) {
                  schedule_timeout_interruptible(20);
                  if (time_after(jiffies,timeout))
                        break;
            }
      }
      dev->modempoll--;
      isdn_tty_shutdown(info);
      isdn_tty_flush_buffer(tty);
      tty_ldisc_flush(tty);
      info->tty = NULL;
      info->ncarrier = 0;
      tty->closing = 0;
      module_put(info->owner);
      if (info->blocked_open) {
            msleep_interruptible(500);
            wake_up_interruptible(&info->open_wait);
      }
      info->flags &= ~(ISDN_ASYNC_NORMAL_ACTIVE | ISDN_ASYNC_CLOSING);
      wake_up_interruptible(&info->close_wait);
#ifdef ISDN_DEBUG_MODEM_OPEN
      printk(KERN_DEBUG "isdn_tty_close normal exit\n");
#endif
}

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

      if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_hangup"))
            return;
      isdn_tty_shutdown(info);
      info->count = 0;
      info->flags &= ~(ISDN_ASYNC_NORMAL_ACTIVE | ISDN_ASYNC_CALLOUT_ACTIVE);
      info->tty = NULL;
      wake_up_interruptible(&info->open_wait);
}

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

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

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

      f->code = 0;
      f->phase = ISDN_FAX_PHASE_IDLE;
      f->direction = 0;
      f->resolution = 1;      /* fine */
      f->rate = 5;            /* 14400 bit/s */
      f->width = 0;
      f->length = 0;
      f->compression = 0;
      f->ecm = 0;
      f->binary = 0;
      f->scantime = 0;
      memset(&f->id[0], 32, FAXIDLEN - 1);
      f->id[FAXIDLEN - 1] = 0;
      f->badlin = 0;
      f->badmul = 0;
      f->bor = 0;
      f->nbc = 0;
      f->cq = 0;
      f->cr = 0;
      f->ctcrty = 0;
      f->minsp = 0;
      f->phcto = 30;
      f->rel = 0;
      memset(&f->pollid[0], 32, FAXIDLEN - 1);
      f->pollid[FAXIDLEN - 1] = 0;
}
#endif

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

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

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

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

      m = &dev->mdm;
      m->tty_modem = alloc_tty_driver(ISDN_MAX_CHANNELS);
      if (!m->tty_modem)
            return -ENOMEM;
      m->tty_modem->name = "ttyI";
      m->tty_modem->major = ISDN_TTY_MAJOR;
      m->tty_modem->minor_start = 0;
      m->tty_modem->type = TTY_DRIVER_TYPE_SERIAL;
      m->tty_modem->subtype = SERIAL_TYPE_NORMAL;
      m->tty_modem->init_termios = tty_std_termios;
      m->tty_modem->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
      m->tty_modem->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
      m->tty_modem->driver_name = "isdn_tty";
      tty_set_operations(m->tty_modem, &modem_ops);
      retval = tty_register_driver(m->tty_modem);
      if (retval) {
            printk(KERN_WARNING "isdn_tty: Couldn't register modem-device\n");
            goto err;
      }
      for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
            info = &m->info[i];
#ifdef CONFIG_ISDN_TTY_FAX
            if (!(info->fax = kmalloc(sizeof(T30_s), GFP_KERNEL))) {
                  printk(KERN_ERR "Could not allocate fax t30-buffer\n");
                  retval = -ENOMEM;
                  goto err_unregister;
            }
#endif
#ifdef MODULE
            info->owner = THIS_MODULE;
#endif
            spin_lock_init(&info->readlock);
            sprintf(info->last_cause, "0000");
            sprintf(info->last_num, "none");
            info->last_dir = 0;
            info->last_lhup = 1;
            info->last_l2 = -1;
            info->last_si = 0;
            isdn_tty_reset_profile(&info->emu);
            isdn_tty_modem_reset_regs(info, 1);
            info->magic = ISDN_ASYNC_MAGIC;
            info->line = i;
            info->tty = NULL;
            info->x_char = 0;
            info->count = 0;
            info->blocked_open = 0;
            init_waitqueue_head(&info->open_wait);
            init_waitqueue_head(&info->close_wait);
            info->isdn_driver = -1;
            info->isdn_channel = -1;
            info->drv_index = -1;
            info->xmit_size = ISDN_SERIAL_XMIT_SIZE;
            init_timer(&info->nc_timer);
            info->nc_timer.function = isdn_tty_modem_do_ncarrier;
            info->nc_timer.data = (unsigned long) info;
            skb_queue_head_init(&info->xmit_queue);
#ifdef CONFIG_ISDN_AUDIO
            skb_queue_head_init(&info->dtmf_queue);
#endif
            if (!(info->xmit_buf = kmalloc(ISDN_SERIAL_XMIT_MAX + 5, GFP_KERNEL))) {
                  printk(KERN_ERR "Could not allocate modem xmit-buffer\n");
                  retval = -ENOMEM;
                  goto err_unregister;
            }
            /* Make room for T.70 header */
            info->xmit_buf += 4;
      }
      return 0;
err_unregister:
      for (i--; i >= 0; i--) {
            info = &m->info[i];
#ifdef CONFIG_ISDN_TTY_FAX
            kfree(info->fax);
#endif
            kfree(info->xmit_buf - 4);
      }
      tty_unregister_driver(m->tty_modem);
 err:
      put_tty_driver(m->tty_modem);
      m->tty_modem = NULL;
      return retval;
}

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

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


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

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

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

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

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

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

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

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

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

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

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

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

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

/*
 * Put a message from the AT-emulator into receive-buffer of tty,
 * convert CR, LF, and BS to values in modem-registers 3, 4 and 5.
 */
void
isdn_tty_at_cout(char *msg, modem_info * info)
{
      struct tty_struct *tty;
      atemu *m = &info->emu;
      char *p;
      char c;
      u_long flags;
      struct sk_buff *skb = NULL;
      char *sp = NULL;
      int l;

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

      l = strlen(msg);

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

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

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

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

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

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

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

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

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

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

      switch (code) {
            case RESULT_RING:
                  m->mdmreg[REG_RINGCNT]++;
                  if (m->mdmreg[REG_RINGCNT] == m->mdmreg[REG_RINGATA])
                        /* Automatically accept incoming call */
                        isdn_tty_cmd_ATA(info);
                  break;
            case RESULT_NO_CARRIER:
#ifdef ISDN_DEBUG_MODEM_HUP
                  printk(KERN_DEBUG "modem_result: NO CARRIER %d %d\n",
                         (info->flags & ISDN_ASYNC_CLOSING),
                         (!info->tty));
#endif
                  m->mdmreg[REG_RINGCNT] = 0;
                  del_timer(&info->nc_timer);
                  info->ncarrier = 0;
                  if ((info->flags & ISDN_ASYNC_CLOSING) || (!info->tty)) {
                        return;
                  }
#ifdef CONFIG_ISDN_AUDIO
                  if (info->vonline & 1) {
#ifdef ISDN_DEBUG_MODEM_VOICE
                        printk(KERN_DEBUG "res3: send DLE-ETX on ttyI%d\n",
                               info->line);
#endif
                        /* voice-recording, add DLE-ETX */
                        isdn_tty_at_cout("\020\003", info);
                  }
                  if (info->vonline & 2) {
#ifdef ISDN_DEBUG_MODEM_VOICE
                        printk(KERN_DEBUG "res3: send DLE-DC4 on ttyI%d\n",
                               info->line);
#endif
                        /* voice-playing, add DLE-DC4 */
                        isdn_tty_at_cout("\020\024", info);
                  }
#endif
                  break;
            case RESULT_CONNECT:
            case RESULT_CONNECT64000:
                  sprintf(info->last_cause, "0000");
                  if (!info->online)
                        info->online = 2;
                  break;
            case RESULT_VCON:
#ifdef ISDN_DEBUG_MODEM_VOICE
                  printk(KERN_DEBUG "res3: send VCON on ttyI%d\n",
                         info->line);
#endif
                  sprintf(info->last_cause, "0000");
                  if (!info->online)
                        info->online = 1;
                  break;
      } /* switch(code) */

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


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

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

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

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

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

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

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

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

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

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

#define MAXRB (sizeof(rb) - 1)

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

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

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

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

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

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

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

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

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

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

/*
 * Parse and perform an AT-command-line.
 */
static void
isdn_tty_parse_at(modem_info * info)
{
      atemu *m = &info->emu;
      char *p;
      char ds[40];

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

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

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

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

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

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

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

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

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

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

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

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

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