drivers/isdn/i4l/isdn_tty.c

   1 /*
   2  * Linux ISDN subsystem, tty functions and AT-command emulator (linklevel).
   3  *
   4  * Copyright 1994-1999  by Fritz Elfert (fritz@isdn4linux.de)
   5  * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg
   6  *
   7  * This software may be used and distributed according to the terms
   8  * of the GNU General Public License, incorporated herein by reference.
   9  *
  10  */
  11 #undef ISDN_TTY_STAT_DEBUG
  12
  13 #include <linux/isdn.h>
  14 #include <linux/serial.h> /* ASYNC_* flags */
  15 #include <linux/slab.h>
  16 #include <linux/delay.h>
  17 #include <linux/mutex.h>
  18 #include "isdn_common.h"
  19 #include "isdn_tty.h"
  20 #ifdef CONFIG_ISDN_AUDIO
  21 #include "isdn_audio.h"
  22 #define VBUF 0x3e0
  23 #define VBUFX (VBUF/16)
  24 #endif
  25
  26 #define FIX_FILE_TRANSFER
  27 #define DUMMY_HAYES_AT
  28
  29 /* Prototypes */
  30
  31 static DEFINE_MUTEX(modem_info_mutex);
  32 static int isdn_tty_edit_at(const char *, int, modem_info *);
  33 static void isdn_tty_check_esc(const u_char *, u_char, int, int *, u_long *);
  34 static void isdn_tty_modem_reset_regs(modem_info *, int);
  35 static void isdn_tty_cmd_ATA(modem_info *);
  36 static void isdn_tty_flush_buffer(struct tty_struct *);
  37 static void isdn_tty_modem_result(int, modem_info *);
  38 #ifdef CONFIG_ISDN_AUDIO
  39 static int isdn_tty_countDLE(unsigned char *, int);
  40 #endif
  41
  42 /* Leave this unchanged unless you know what you do! */
  43 #define MODEM_PARANOIA_CHECK
  44 #define MODEM_DO_RESTART
  45
  46 static int bit2si[8] =
  47 {1, 5, 7, 7, 7, 7, 7, 7};
  48 static int si2bit[8] =
  49 {4, 1, 4, 4, 4, 4, 4, 4};
  50
  51 /* isdn_tty_try_read() is called from within isdn_tty_rcv_skb()
  52  * to stuff incoming data directly into a tty's flip-buffer. This
  53  * is done to speed up tty-receiving if the receive-queue is empty.
  54  * This routine MUST be called with interrupts off.
  55  * Return:
  56  *  1 = Success
  57  *  0 = Failure, data has to be buffered and later processed by
  58  *      isdn_tty_readmodem().
  59  */
  60 static int
  61 isdn_tty_try_read(modem_info *info, struct sk_buff *skb)
  62 {
  63         int c;
  64         int len;
  65         struct tty_struct *tty;
  66         char last;
  67
  68         if (!info->online)
  69                 return 0;
  70
  71         tty = info->port.tty;
  72         if (!tty)
  73                 return 0;
  74
  75         if (!(info->mcr & UART_MCR_RTS))
  76                 return 0;
  77
  78         len = skb->len
  79 #ifdef CONFIG_ISDN_AUDIO
  80                 + ISDN_AUDIO_SKB_DLECOUNT(skb)
  81 #endif
  82                 ;
  83
  84         c = tty_buffer_request_room(tty, len);
  85         if (c < len)
  86                 return 0;
  87
  88 #ifdef CONFIG_ISDN_AUDIO
  89         if (ISDN_AUDIO_SKB_DLECOUNT(skb)) {
  90                 int l = skb->len;
  91                 unsigned char *dp = skb->data;
  92                 while (--l) {
  93                         if (*dp == DLE)
  94                                 tty_insert_flip_char(tty, DLE, 0);
  95                         tty_insert_flip_char(tty, *dp++, 0);
  96                 }
  97                 if (*dp == DLE)
  98                         tty_insert_flip_char(tty, DLE, 0);
  99                 last = *dp;
 100         } else {
 101 #endif
 102                 if (len > 1)
 103                         tty_insert_flip_string(tty, skb->data, len - 1);
 104                 last = skb->data[len - 1];
 105 #ifdef CONFIG_ISDN_AUDIO
 106         }
 107 #endif
 108         if (info->emu.mdmreg[REG_CPPP] & BIT_CPPP)
 109                 tty_insert_flip_char(tty, last, 0xFF);
 110         else
 111                 tty_insert_flip_char(tty, last, TTY_NORMAL);
 112         tty_flip_buffer_push(tty);
 113         kfree_skb(skb);
 114
 115         return 1;
 116 }
 117
 118 /* isdn_tty_readmodem() is called periodically from within timer-interrupt.
 119  * It tries getting received data from the receive queue an stuff it into
 120  * the tty's flip-buffer.
 121  */
 122 void
 123 isdn_tty_readmodem(void)
 124 {
 125         int resched = 0;
 126         int midx;
 127         int i;
 128         int r;
 129         struct tty_struct *tty;
 130         modem_info *info;
 131
 132         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
 133                 midx = dev->m_idx[i];
 134                 if (midx < 0)
 135                         continue;
 136
 137                 info = &dev->mdm.info[midx];
 138                 if (!info->online)
 139                         continue;
 140
 141                 r = 0;
 142 #ifdef CONFIG_ISDN_AUDIO
 143                 isdn_audio_eval_dtmf(info);
 144                 if ((info->vonline & 1) && (info->emu.vpar[1]))
 145                         isdn_audio_eval_silence(info);
 146 #endif
 147                 tty = info->port.tty;
 148                 if (tty) {
 149                         if (info->mcr & UART_MCR_RTS) {
 150                                 /* CISCO AsyncPPP Hack */
 151                                 if (!(info->emu.mdmreg[REG_CPPP] & BIT_CPPP))
 152                                         r = isdn_readbchan_tty(info->isdn_driver, info->isdn_channel, tty, 0);
 153                                 else
 154                                         r = isdn_readbchan_tty(info->isdn_driver, info->isdn_channel, tty, 1);
 155                                 if (r)
 156                                         tty_flip_buffer_push(tty);
 157                         } else
 158                                 r = 1;
 159                 } else
 160                         r = 1;
 161                 if (r) {
 162                         info->rcvsched = 0;
 163                         resched = 1;
 164                 } else
 165                         info->rcvsched = 1;
 166         }
 167         if (!resched)
 168                 isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 0);
 169 }
 170
 171 int
 172 isdn_tty_rcv_skb(int i, int di, int channel, struct sk_buff *skb)
 173 {
 174         ulong flags;
 175         int midx;
 176 #ifdef CONFIG_ISDN_AUDIO
 177         int ifmt;
 178 #endif
 179         modem_info *info;
 180
 181         if ((midx = dev->m_idx[i]) < 0) {
 182                 /* if midx is invalid, packet is not for tty */
 183                 return 0;
 184         }
 185         info = &dev->mdm.info[midx];
 186 #ifdef CONFIG_ISDN_AUDIO
 187         ifmt = 1;
 188
 189         if ((info->vonline) && (!info->emu.vpar[4]))
 190                 isdn_audio_calc_dtmf(info, skb->data, skb->len, ifmt);
 191         if ((info->vonline & 1) && (info->emu.vpar[1]))
 192                 isdn_audio_calc_silence(info, skb->data, skb->len, ifmt);
 193 #endif
 194         if ((info->online < 2)
 195 #ifdef CONFIG_ISDN_AUDIO
 196             && (!(info->vonline & 1))
 197 #endif
 198                 ) {
 199                 /* If Modem not listening, drop data */
 200                 kfree_skb(skb);
 201                 return 1;
 202         }
 203         if (info->emu.mdmreg[REG_T70] & BIT_T70) {
 204                 if (info->emu.mdmreg[REG_T70] & BIT_T70_EXT) {
 205                         /* T.70 decoding: throw away the T.70 header (2 or 4 bytes)   */
 206                         if (skb->data[0] == 3) /* pure data packet -> 4 byte headers  */
 207                                 skb_pull(skb, 4);
 208                         else
 209                                 if (skb->data[0] == 1) /* keepalive packet -> 2 byte hdr  */
 210                                         skb_pull(skb, 2);
 211                 } else
 212                         /* T.70 decoding: Simply throw away the T.70 header (4 bytes) */
 213                         if ((skb->data[0] == 1) && ((skb->data[1] == 0) || (skb->data[1] == 1)))
 214                                 skb_pull(skb, 4);
 215         }
 216 #ifdef CONFIG_ISDN_AUDIO
 217         ISDN_AUDIO_SKB_DLECOUNT(skb) = 0;
 218         ISDN_AUDIO_SKB_LOCK(skb) = 0;
 219         if (info->vonline & 1) {
 220                 /* voice conversion/compression */
 221                 switch (info->emu.vpar[3]) {
 222                 case 2:
 223                 case 3:
 224                 case 4:
 225                         /* adpcm
 226                          * Since compressed data takes less
 227                          * space, we can overwrite the buffer.
 228                          */
 229                         skb_trim(skb, isdn_audio_xlaw2adpcm(info->adpcmr,
 230                                                             ifmt,
 231                                                             skb->data,
 232                                                             skb->data,
 233                                                             skb->len));
 234                         break;
 235                 case 5:
 236                         /* a-law */
 237                         if (!ifmt)
 238                                 isdn_audio_ulaw2alaw(skb->data, skb->len);
 239                         break;
 240                 case 6:
 241                         /* u-law */
 242                         if (ifmt)
 243                                 isdn_audio_alaw2ulaw(skb->data, skb->len);
 244                         break;
 245                 }
 246                 ISDN_AUDIO_SKB_DLECOUNT(skb) =
 247                         isdn_tty_countDLE(skb->data, skb->len);
 248         }
 249 #ifdef CONFIG_ISDN_TTY_FAX
 250         else {
 251                 if (info->faxonline & 2) {
 252                         isdn_tty_fax_bitorder(info, skb);
 253                         ISDN_AUDIO_SKB_DLECOUNT(skb) =
 254                                 isdn_tty_countDLE(skb->data, skb->len);
 255                 }
 256         }
 257 #endif
 258 #endif
 259         /* Try to deliver directly via tty-buf if queue is empty */
 260         spin_lock_irqsave(&info->readlock, flags);
 261         if (skb_queue_empty(&dev->drv[di]->rpqueue[channel]))
 262                 if (isdn_tty_try_read(info, skb)) {
 263                         spin_unlock_irqrestore(&info->readlock, flags);
 264                         return 1;
 265                 }
 266         /* Direct deliver failed or queue wasn't empty.
 267          * Queue up for later dequeueing via timer-irq.
 268          */
 269         __skb_queue_tail(&dev->drv[di]->rpqueue[channel], skb);
 270         dev->drv[di]->rcvcount[channel] +=
 271                 (skb->len
 272 #ifdef CONFIG_ISDN_AUDIO
 273                  + ISDN_AUDIO_SKB_DLECOUNT(skb)
 274 #endif
 275                         );
 276         spin_unlock_irqrestore(&info->readlock, flags);
 277         /* Schedule dequeuing */
 278         if ((dev->modempoll) && (info->rcvsched))
 279                 isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 1);
 280         return 1;
 281 }
 282
 283 static void
 284 isdn_tty_cleanup_xmit(modem_info *info)
 285 {
 286         skb_queue_purge(&info->xmit_queue);
 287 #ifdef CONFIG_ISDN_AUDIO
 288         skb_queue_purge(&info->dtmf_queue);
 289 #endif
 290 }
 291
 292 static void
 293 isdn_tty_tint(modem_info *info)
 294 {
 295         struct sk_buff *skb = skb_dequeue(&info->xmit_queue);
 296         int len, slen;
 297
 298         if (!skb)
 299                 return;
 300         len = skb->len;
 301         if ((slen = isdn_writebuf_skb_stub(info->isdn_driver,
 302                                            info->isdn_channel, 1, skb)) == len) {
 303                 struct tty_struct *tty = info->port.tty;
 304                 info->send_outstanding++;
 305                 info->msr &= ~UART_MSR_CTS;
 306                 info->lsr &= ~UART_LSR_TEMT;
 307                 tty_wakeup(tty);
 308                 return;
 309         }
 310         if (slen < 0) {
 311                 /* Error: no channel, already shutdown, or wrong parameter */
 312                 dev_kfree_skb(skb);
 313                 return;
 314         }
 315         skb_queue_head(&info->xmit_queue, skb);
 316 }
 317
 318 #ifdef CONFIG_ISDN_AUDIO
 319 static int
 320 isdn_tty_countDLE(unsigned char *buf, int len)
 321 {
 322         int count = 0;
 323
 324         while (len--)
 325                 if (*buf++ == DLE)
 326                         count++;
 327         return count;
 328 }
 329
 330 /* This routine is called from within isdn_tty_write() to perform
 331  * DLE-decoding when sending audio-data.
 332  */
 333 static int
 334 isdn_tty_handleDLEdown(modem_info *info, atemu *m, int len)
 335 {
 336         unsigned char *p = &info->port.xmit_buf[info->xmit_count];
 337         int count = 0;
 338
 339         while (len > 0) {
 340                 if (m->lastDLE) {
 341                         m->lastDLE = 0;
 342                         switch (*p) {
 343                         case DLE:
 344                                 /* Escape code */
 345                                 if (len > 1)
 346                                         memmove(p, p + 1, len - 1);
 347                                 p--;
 348                                 count++;
 349                                 break;
 350                         case ETX:
 351                                 /* End of data */
 352                                 info->vonline |= 4;
 353                                 return count;
 354                         case DC4:
 355                                 /* Abort RX */
 356                                 info->vonline &= ~1;
 357 #ifdef ISDN_DEBUG_MODEM_VOICE
 358                                 printk(KERN_DEBUG
 359                                        "DLEdown: got DLE-DC4, send DLE-ETX on ttyI%d\n",
 360                                        info->line);
 361 #endif
 362                                 isdn_tty_at_cout("\020\003", info);
 363                                 if (!info->vonline) {
 364 #ifdef ISDN_DEBUG_MODEM_VOICE
 365                                         printk(KERN_DEBUG
 366                                                "DLEdown: send VCON on ttyI%d\n",
 367                                                info->line);
 368 #endif
 369                                         isdn_tty_at_cout("\r\nVCON\r\n", info);
 370                                 }
 371                                 /* Fall through */
 372                         case 'q':
 373                         case 's':
 374                                 /* Silence */
 375                                 if (len > 1)
 376                                         memmove(p, p + 1, len - 1);
 377                                 p--;
 378                                 break;
 379                         }
 380                 } else {
 381                         if (*p == DLE)
 382                                 m->lastDLE = 1;
 383                         else
 384                                 count++;
 385                 }
 386                 p++;
 387                 len--;
 388         }
 389         if (len < 0) {
 390                 printk(KERN_WARNING "isdn_tty: len<0 in DLEdown\n");
 391                 return 0;
 392         }
 393         return count;
 394 }
 395
 396 /* This routine is called from within isdn_tty_write() when receiving
 397  * audio-data. It interrupts receiving, if an character other than
 398  * ^S or ^Q is sent.
 399  */
 400 static int
 401 isdn_tty_end_vrx(const char *buf, int c)
 402 {
 403         char ch;
 404
 405         while (c--) {
 406                 ch = *buf;
 407                 if ((ch != 0x11) && (ch != 0x13))
 408                         return 1;
 409                 buf++;
 410         }
 411         return 0;
 412 }
 413
 414 static int voice_cf[7] =
 415 {0, 0, 4, 3, 2, 0, 0};
 416
 417 #endif                          /* CONFIG_ISDN_AUDIO */
 418
 419 /* isdn_tty_senddown() is called either directly from within isdn_tty_write()
 420  * or via timer-interrupt from within isdn_tty_modem_xmit(). It pulls
 421  * outgoing data from the tty's xmit-buffer, handles voice-decompression or
 422  * T.70 if necessary, and finally queues it up for sending via isdn_tty_tint.
 423  */
 424 static void
 425 isdn_tty_senddown(modem_info *info)
 426 {
 427         int buflen;
 428         int skb_res;
 429 #ifdef CONFIG_ISDN_AUDIO
 430         int audio_len;
 431 #endif
 432         struct sk_buff *skb;
 433
 434 #ifdef CONFIG_ISDN_AUDIO
 435         if (info->vonline & 4) {
 436                 info->vonline &= ~6;
 437                 if (!info->vonline) {
 438 #ifdef ISDN_DEBUG_MODEM_VOICE
 439                         printk(KERN_DEBUG
 440                                "senddown: send VCON on ttyI%d\n",
 441                                info->line);
 442 #endif
 443                         isdn_tty_at_cout("\r\nVCON\r\n", info);
 444                 }
 445         }
 446 #endif
 447         if (!(buflen = info->xmit_count))
 448                 return;
 449         if ((info->emu.mdmreg[REG_CTS] & BIT_CTS) != 0)
 450                 info->msr &= ~UART_MSR_CTS;
 451         info->lsr &= ~UART_LSR_TEMT;
 452         /* info->xmit_count is modified here and in isdn_tty_write().
 453          * So we return here if isdn_tty_write() is in the
 454          * critical section.
 455          */
 456         atomic_inc(&info->xmit_lock);
 457         if (!(atomic_dec_and_test(&info->xmit_lock)))
 458                 return;
 459         if (info->isdn_driver < 0) {
 460                 info->xmit_count = 0;
 461                 return;
 462         }
 463         skb_res = dev->drv[info->isdn_driver]->interface->hl_hdrlen + 4;
 464 #ifdef CONFIG_ISDN_AUDIO
 465         if (info->vonline & 2)
 466                 audio_len = buflen * voice_cf[info->emu.vpar[3]];
 467         else
 468                 audio_len = 0;
 469         skb = dev_alloc_skb(skb_res + buflen + audio_len);
 470 #else
 471         skb = dev_alloc_skb(skb_res + buflen);
 472 #endif
 473         if (!skb) {
 474                 printk(KERN_WARNING
 475                        "isdn_tty: Out of memory in ttyI%d senddown\n",
 476                        info->line);
 477                 return;
 478         }
 479         skb_reserve(skb, skb_res);
 480         memcpy(skb_put(skb, buflen), info->port.xmit_buf, buflen);
 481         info->xmit_count = 0;
 482 #ifdef CONFIG_ISDN_AUDIO
 483         if (info->vonline & 2) {
 484                 /* For now, ifmt is fixed to 1 (alaw), since this
 485                  * is used with ISDN everywhere in the world, except
 486                  * US, Canada and Japan.
 487                  * Later, when US-ISDN protocols are implemented,
 488                  * this setting will depend on the D-channel protocol.
 489                  */
 490                 int ifmt = 1;
 491
 492                 /* voice conversion/decompression */
 493                 switch (info->emu.vpar[3]) {
 494                 case 2:
 495                 case 3:
 496                 case 4:
 497                         /* adpcm, compatible to ZyXel 1496 modem
 498                          * with ROM revision 6.01
 499                          */
 500                         audio_len = isdn_audio_adpcm2xlaw(info->adpcms,
 501                                                           ifmt,
 502                                                           skb->data,
 503                                                           skb_put(skb, audio_len),
 504                                                           buflen);
 505                         skb_pull(skb, buflen);
 506                         skb_trim(skb, audio_len);
 507                         break;
 508                 case 5:
 509                         /* a-law */
 510                         if (!ifmt)
 511                                 isdn_audio_alaw2ulaw(skb->data,
 512                                                      buflen);
 513                         break;
 514                 case 6:
 515                         /* u-law */
 516                         if (ifmt)
 517                                 isdn_audio_ulaw2alaw(skb->data,
 518                                                      buflen);
 519                         break;
 520                 }
 521         }
 522 #endif                          /* CONFIG_ISDN_AUDIO */
 523         if (info->emu.mdmreg[REG_T70] & BIT_T70) {
 524                 /* Add T.70 simplified header */
 525                 if (info->emu.mdmreg[REG_T70] & BIT_T70_EXT)
 526                         memcpy(skb_push(skb, 2), "\1\0", 2);
 527                 else
 528                         memcpy(skb_push(skb, 4), "\1\0\1\0", 4);
 529         }
 530         skb_queue_tail(&info->xmit_queue, skb);
 531 }
 532
 533 /************************************************************
 534  *
 535  * Modem-functions
 536  *
 537  * mostly "stolen" from original Linux-serial.c and friends.
 538  *
 539  ************************************************************/
 540
 541 /* The next routine is called once from within timer-interrupt
 542  * triggered within isdn_tty_modem_ncarrier(). It calls
 543  * isdn_tty_modem_result() to stuff a "NO CARRIER" Message
 544  * into the tty's buffer.
 545  */
 546 static void
 547 isdn_tty_modem_do_ncarrier(unsigned long data)
 548 {
 549         modem_info *info = (modem_info *) data;
 550         isdn_tty_modem_result(RESULT_NO_CARRIER, info);
 551 }
 552
 553 /* Next routine is called, whenever the DTR-signal is raised.
 554  * It checks the ncarrier-flag, and triggers the above routine
 555  * when necessary. The ncarrier-flag is set, whenever DTR goes
 556  * low.
 557  */
 558 static void
 559 isdn_tty_modem_ncarrier(modem_info *info)
 560 {
 561         if (info->ncarrier) {
 562                 info->nc_timer.expires = jiffies + HZ;
 563                 add_timer(&info->nc_timer);
 564         }
 565 }
 566
 567 /*
 568  * return the usage calculated by si and layer 2 protocol
 569  */
 570 static int
 571 isdn_calc_usage(int si, int l2)
 572 {
 573         int usg = ISDN_USAGE_MODEM;
 574
 575 #ifdef CONFIG_ISDN_AUDIO
 576         if (si == 1) {
 577                 switch (l2) {
 578                 case ISDN_PROTO_L2_MODEM:
 579                         usg = ISDN_USAGE_MODEM;
 580                         break;
 581 #ifdef CONFIG_ISDN_TTY_FAX
 582                 case ISDN_PROTO_L2_FAX:
 583                         usg = ISDN_USAGE_FAX;
 584                         break;
 585 #endif
 586                 case ISDN_PROTO_L2_TRANS:
 587                 default:
 588                         usg = ISDN_USAGE_VOICE;
 589                         break;
 590                 }
 591         }
 592 #endif
 593         return (usg);
 594 }
 595
 596 /* isdn_tty_dial() performs dialing of a tty an the necessary
 597  * setup of the lower levels before that.
 598  */
 599 static void
 600 isdn_tty_dial(char *n, modem_info *info, atemu *m)
 601 {
 602         int usg = ISDN_USAGE_MODEM;
 603         int si = 7;
 604         int l2 = m->mdmreg[REG_L2PROT];
 605         u_long flags;
 606         isdn_ctrl cmd;
 607         int i;
 608         int j;
 609
 610         for (j = 7; j >= 0; j--)
 611                 if (m->mdmreg[REG_SI1] & (1 << j)) {
 612                         si = bit2si[j];
 613                         break;
 614                 }
 615         usg = isdn_calc_usage(si, l2);
 616 #ifdef CONFIG_ISDN_AUDIO
 617         if ((si == 1) &&
 618             (l2 != ISDN_PROTO_L2_MODEM)
 619 #ifdef CONFIG_ISDN_TTY_FAX
 620             && (l2 != ISDN_PROTO_L2_FAX)
 621 #endif
 622                 ) {
 623                 l2 = ISDN_PROTO_L2_TRANS;
 624                 usg = ISDN_USAGE_VOICE;
 625         }
 626 #endif
 627         m->mdmreg[REG_SI1I] = si2bit[si];
 628         spin_lock_irqsave(&dev->lock, flags);
 629         i = isdn_get_free_channel(usg, l2, m->mdmreg[REG_L3PROT], -1, -1, m->msn);
 630         if (i < 0) {
 631                 spin_unlock_irqrestore(&dev->lock, flags);
 632                 isdn_tty_modem_result(RESULT_NO_DIALTONE, info);
 633         } else {
 634                 info->isdn_driver = dev->drvmap[i];
 635                 info->isdn_channel = dev->chanmap[i];
 636                 info->drv_index = i;
 637                 dev->m_idx[i] = info->line;
 638                 dev->usage[i] |= ISDN_USAGE_OUTGOING;
 639                 info->last_dir = 1;
 640                 strcpy(info->last_num, n);
 641                 isdn_info_update();
 642                 spin_unlock_irqrestore(&dev->lock, flags);
 643                 cmd.driver = info->isdn_driver;
 644                 cmd.arg = info->isdn_channel;
 645                 cmd.command = ISDN_CMD_CLREAZ;
 646                 isdn_command(&cmd);
 647                 strcpy(cmd.parm.num, isdn_map_eaz2msn(m->msn, info->isdn_driver));
 648                 cmd.driver = info->isdn_driver;
 649                 cmd.command = ISDN_CMD_SETEAZ;
 650                 isdn_command(&cmd);
 651                 cmd.driver = info->isdn_driver;
 652                 cmd.command = ISDN_CMD_SETL2;
 653                 info->last_l2 = l2;
 654                 cmd.arg = info->isdn_channel + (l2 << 8);
 655                 isdn_command(&cmd);
 656                 cmd.driver = info->isdn_driver;
 657                 cmd.command = ISDN_CMD_SETL3;
 658                 cmd.arg = info->isdn_channel + (m->mdmreg[REG_L3PROT] << 8);
 659 #ifdef CONFIG_ISDN_TTY_FAX
 660                 if (l2 == ISDN_PROTO_L2_FAX) {
 661                         cmd.parm.fax = info->fax;
 662                         info->fax->direction = ISDN_TTY_FAX_CONN_OUT;
 663                 }
 664 #endif
 665                 isdn_command(&cmd);
 666                 cmd.driver = info->isdn_driver;
 667                 cmd.arg = info->isdn_channel;
 668                 sprintf(cmd.parm.setup.phone, "%s", n);
 669                 sprintf(cmd.parm.setup.eazmsn, "%s",
 670                         isdn_map_eaz2msn(m->msn, info->isdn_driver));
 671                 cmd.parm.setup.si1 = si;
 672                 cmd.parm.setup.si2 = m->mdmreg[REG_SI2];
 673                 cmd.command = ISDN_CMD_DIAL;
 674                 info->dialing = 1;
 675                 info->emu.carrierwait = 0;
 676                 strcpy(dev->num[i], n);
 677                 isdn_info_update();
 678                 isdn_command(&cmd);
 679                 isdn_timer_ctrl(ISDN_TIMER_CARRIER, 1);
 680         }
 681 }
 682
 683 /* isdn_tty_hangup() disassociates a tty from the real
 684  * ISDN-line (hangup). The usage-status is cleared
 685  * and some cleanup is done also.
 686  */
 687 void
 688 isdn_tty_modem_hup(modem_info *info, int local)
 689 {
 690         isdn_ctrl cmd;
 691         int di, ch;
 692
 693         if (!info)
 694                 return;
 695
 696         di = info->isdn_driver;
 697         ch = info->isdn_channel;
 698         if (di < 0 || ch < 0)
 699                 return;
 700
 701         info->isdn_driver = -1;
 702         info->isdn_channel = -1;
 703
 704 #ifdef ISDN_DEBUG_MODEM_HUP
 705         printk(KERN_DEBUG "Mhup ttyI%d\n", info->line);
 706 #endif
 707         info->rcvsched = 0;
 708         isdn_tty_flush_buffer(info->port.tty);
 709         if (info->online) {
 710                 info->last_lhup = local;
 711                 info->online = 0;
 712                 isdn_tty_modem_result(RESULT_NO_CARRIER, info);
 713         }
 714 #ifdef CONFIG_ISDN_AUDIO
 715         info->vonline = 0;
 716 #ifdef CONFIG_ISDN_TTY_FAX
 717         info->faxonline = 0;
 718         info->fax->phase = ISDN_FAX_PHASE_IDLE;
 719 #endif
 720         info->emu.vpar[4] = 0;
 721         info->emu.vpar[5] = 8;
 722         kfree(info->dtmf_state);
 723         info->dtmf_state = NULL;
 724         kfree(info->silence_state);
 725         info->silence_state = NULL;
 726         kfree(info->adpcms);
 727         info->adpcms = NULL;
 728         kfree(info->adpcmr);
 729         info->adpcmr = NULL;
 730 #endif
 731         if ((info->msr & UART_MSR_RI) &&
 732             (info->emu.mdmreg[REG_RUNG] & BIT_RUNG))
 733                 isdn_tty_modem_result(RESULT_RUNG, info);
 734         info->msr &= ~(UART_MSR_DCD | UART_MSR_RI);
 735         info->lsr |= UART_LSR_TEMT;
 736
 737         if (local) {
 738                 cmd.driver = di;
 739                 cmd.command = ISDN_CMD_HANGUP;
 740                 cmd.arg = ch;
 741                 isdn_command(&cmd);
 742         }
 743
 744         isdn_all_eaz(di, ch);
 745         info->emu.mdmreg[REG_RINGCNT] = 0;
 746         isdn_free_channel(di, ch, 0);
 747
 748         if (info->drv_index >= 0) {
 749                 dev->m_idx[info->drv_index] = -1;
 750                 info->drv_index = -1;
 751         }
 752 }
 753
 754 /*
 755  * Begin of a CAPI like interface, currently used only for
 756  * supplementary service (CAPI 2.0 part III)
 757  */
 758 #include <linux/isdn/capicmd.h>
 759 #include <linux/module.h>
 760
 761 int
 762 isdn_tty_capi_facility(capi_msg *cm) {
 763         return (-1); /* dummy */
 764 }
 765
 766 /* isdn_tty_suspend() tries to suspend the current tty connection
 767  */
 768 static void
 769 isdn_tty_suspend(char *id, modem_info *info, atemu *m)
 770 {
 771         isdn_ctrl cmd;
 772
 773         int l;
 774
 775         if (!info)
 776                 return;
 777
 778 #ifdef ISDN_DEBUG_MODEM_SERVICES
 779         printk(KERN_DEBUG "Msusp ttyI%d\n", info->line);
 780 #endif
 781         l = strlen(id);
 782         if ((info->isdn_driver >= 0)) {
 783                 cmd.parm.cmsg.Length = l + 18;
 784                 cmd.parm.cmsg.Command = CAPI_FACILITY;
 785                 cmd.parm.cmsg.Subcommand = CAPI_REQ;
 786                 cmd.parm.cmsg.adr.Controller = info->isdn_driver + 1;
 787                 cmd.parm.cmsg.para[0] = 3; /* 16 bit 0x0003 suplementary service */
 788                 cmd.parm.cmsg.para[1] = 0;
 789                 cmd.parm.cmsg.para[2] = l + 3;
 790                 cmd.parm.cmsg.para[3] = 4; /* 16 bit 0x0004 Suspend */
 791                 cmd.parm.cmsg.para[4] = 0;
 792                 cmd.parm.cmsg.para[5] = l;
 793                 strncpy(&cmd.parm.cmsg.para[6], id, l);
 794                 cmd.command = CAPI_PUT_MESSAGE;
 795                 cmd.driver = info->isdn_driver;
 796                 cmd.arg = info->isdn_channel;
 797                 isdn_command(&cmd);
 798         }
 799 }
 800
 801 /* isdn_tty_resume() tries to resume a suspended call
 802  * setup of the lower levels before that. unfortunately here is no
 803  * checking for compatibility of used protocols implemented by Q931
 804  * It does the same things like isdn_tty_dial, the last command
 805  * is different, may be we can merge it.
 806  */
 807
 808 static void
 809 isdn_tty_resume(char *id, modem_info *info, atemu *m)
 810 {
 811         int usg = ISDN_USAGE_MODEM;
 812         int si = 7;
 813         int l2 = m->mdmreg[REG_L2PROT];
 814         isdn_ctrl cmd;
 815         ulong flags;
 816         int i;
 817         int j;
 818         int l;
 819
 820         l = strlen(id);
 821         for (j = 7; j >= 0; j--)
 822                 if (m->mdmreg[REG_SI1] & (1 << j)) {
 823                         si = bit2si[j];
 824                         break;
 825                 }
 826         usg = isdn_calc_usage(si, l2);
 827 #ifdef CONFIG_ISDN_AUDIO
 828         if ((si == 1) &&
 829             (l2 != ISDN_PROTO_L2_MODEM)
 830 #ifdef CONFIG_ISDN_TTY_FAX
 831             && (l2 != ISDN_PROTO_L2_FAX)
 832 #endif
 833                 ) {
 834                 l2 = ISDN_PROTO_L2_TRANS;
 835                 usg = ISDN_USAGE_VOICE;
 836         }
 837 #endif
 838         m->mdmreg[REG_SI1I] = si2bit[si];
 839         spin_lock_irqsave(&dev->lock, flags);
 840         i = isdn_get_free_channel(usg, l2, m->mdmreg[REG_L3PROT], -1, -1, m->msn);
 841         if (i < 0) {
 842                 spin_unlock_irqrestore(&dev->lock, flags);
 843                 isdn_tty_modem_result(RESULT_NO_DIALTONE, info);
 844         } else {
 845                 info->isdn_driver = dev->drvmap[i];
 846                 info->isdn_channel = dev->chanmap[i];
 847                 info->drv_index = i;
 848                 dev->m_idx[i] = info->line;
 849                 dev->usage[i] |= ISDN_USAGE_OUTGOING;
 850                 info->last_dir = 1;
 851 //              strcpy(info->last_num, n);
 852                 isdn_info_update();
 853                 spin_unlock_irqrestore(&dev->lock, flags);
 854                 cmd.driver = info->isdn_driver;
 855                 cmd.arg = info->isdn_channel;
 856                 cmd.command = ISDN_CMD_CLREAZ;
 857                 isdn_command(&cmd);
 858                 strcpy(cmd.parm.num, isdn_map_eaz2msn(m->msn, info->isdn_driver));
 859                 cmd.driver = info->isdn_driver;
 860                 cmd.command = ISDN_CMD_SETEAZ;
 861                 isdn_command(&cmd);
 862                 cmd.driver = info->isdn_driver;
 863                 cmd.command = ISDN_CMD_SETL2;
 864                 info->last_l2 = l2;
 865                 cmd.arg = info->isdn_channel + (l2 << 8);
 866                 isdn_command(&cmd);
 867                 cmd.driver = info->isdn_driver;
 868                 cmd.command = ISDN_CMD_SETL3;
 869                 cmd.arg = info->isdn_channel + (m->mdmreg[REG_L3PROT] << 8);
 870                 isdn_command(&cmd);
 871                 cmd.driver = info->isdn_driver;
 872                 cmd.arg = info->isdn_channel;
 873                 cmd.parm.cmsg.Length = l + 18;
 874                 cmd.parm.cmsg.Command = CAPI_FACILITY;
 875                 cmd.parm.cmsg.Subcommand = CAPI_REQ;
 876                 cmd.parm.cmsg.adr.Controller = info->isdn_driver + 1;
 877                 cmd.parm.cmsg.para[0] = 3; /* 16 bit 0x0003 suplementary service */
 878                 cmd.parm.cmsg.para[1] = 0;
 879                 cmd.parm.cmsg.para[2] = l + 3;
 880                 cmd.parm.cmsg.para[3] = 5; /* 16 bit 0x0005 Resume */
 881                 cmd.parm.cmsg.para[4] = 0;
 882                 cmd.parm.cmsg.para[5] = l;
 883                 strncpy(&cmd.parm.cmsg.para[6], id, l);
 884                 cmd.command = CAPI_PUT_MESSAGE;
 885                 info->dialing = 1;
 886 //              strcpy(dev->num[i], n);
 887                 isdn_info_update();
 888                 isdn_command(&cmd);
 889                 isdn_timer_ctrl(ISDN_TIMER_CARRIER, 1);
 890         }
 891 }
 892
 893 /* isdn_tty_send_msg() sends a message to a HL driver
 894  * This is used for hybrid modem cards to send AT commands to it
 895  */
 896
 897 static void
 898 isdn_tty_send_msg(modem_info *info, atemu *m, char *msg)
 899 {
 900         int usg = ISDN_USAGE_MODEM;
 901         int si = 7;
 902         int l2 = m->mdmreg[REG_L2PROT];
 903         isdn_ctrl cmd;
 904         ulong flags;
 905         int i;
 906         int j;
 907         int l;
 908
 909         l = strlen(msg);
 910         if (!l) {
 911                 isdn_tty_modem_result(RESULT_ERROR, info);
 912                 return;
 913         }
 914         for (j = 7; j >= 0; j--)
 915                 if (m->mdmreg[REG_SI1] & (1 << j)) {
 916                         si = bit2si[j];
 917                         break;
 918                 }
 919         usg = isdn_calc_usage(si, l2);
 920 #ifdef CONFIG_ISDN_AUDIO
 921         if ((si == 1) &&
 922             (l2 != ISDN_PROTO_L2_MODEM)
 923 #ifdef CONFIG_ISDN_TTY_FAX
 924             && (l2 != ISDN_PROTO_L2_FAX)
 925 #endif
 926                 ) {
 927                 l2 = ISDN_PROTO_L2_TRANS;
 928                 usg = ISDN_USAGE_VOICE;
 929         }
 930 #endif
 931         m->mdmreg[REG_SI1I] = si2bit[si];
 932         spin_lock_irqsave(&dev->lock, flags);
 933         i = isdn_get_free_channel(usg, l2, m->mdmreg[REG_L3PROT], -1, -1, m->msn);
 934         if (i < 0) {
 935                 spin_unlock_irqrestore(&dev->lock, flags);
 936                 isdn_tty_modem_result(RESULT_NO_DIALTONE, info);
 937         } else {
 938                 info->isdn_driver = dev->drvmap[i];
 939                 info->isdn_channel = dev->chanmap[i];
 940                 info->drv_index = i;
 941                 dev->m_idx[i] = info->line;
 942                 dev->usage[i] |= ISDN_USAGE_OUTGOING;
 943                 info->last_dir = 1;
 944                 isdn_info_update();
 945                 spin_unlock_irqrestore(&dev->lock, flags);
 946                 cmd.driver = info->isdn_driver;
 947                 cmd.arg = info->isdn_channel;
 948                 cmd.command = ISDN_CMD_CLREAZ;
 949                 isdn_command(&cmd);
 950                 strcpy(cmd.parm.num, isdn_map_eaz2msn(m->msn, info->isdn_driver));
 951                 cmd.driver = info->isdn_driver;
 952                 cmd.command = ISDN_CMD_SETEAZ;
 953                 isdn_command(&cmd);
 954                 cmd.driver = info->isdn_driver;
 955                 cmd.command = ISDN_CMD_SETL2;
 956                 info->last_l2 = l2;
 957                 cmd.arg = info->isdn_channel + (l2 << 8);
 958                 isdn_command(&cmd);
 959                 cmd.driver = info->isdn_driver;
 960                 cmd.command = ISDN_CMD_SETL3;
 961                 cmd.arg = info->isdn_channel + (m->mdmreg[REG_L3PROT] << 8);
 962                 isdn_command(&cmd);
 963                 cmd.driver = info->isdn_driver;
 964                 cmd.arg = info->isdn_channel;
 965                 cmd.parm.cmsg.Length = l + 14;
 966                 cmd.parm.cmsg.Command = CAPI_MANUFACTURER;
 967                 cmd.parm.cmsg.Subcommand = CAPI_REQ;
 968                 cmd.parm.cmsg.adr.Controller = info->isdn_driver + 1;
 969                 cmd.parm.cmsg.para[0] = l + 1;
 970                 strncpy(&cmd.parm.cmsg.para[1], msg, l);
 971                 cmd.parm.cmsg.para[l + 1] = 0xd;
 972                 cmd.command = CAPI_PUT_MESSAGE;
 973 /*              info->dialing = 1;
 974                 strcpy(dev->num[i], n);
 975                 isdn_info_update();
 976 */
 977                 isdn_command(&cmd);
 978         }
 979 }
 980
 981 static inline int
 982 isdn_tty_paranoia_check(modem_info *info, char *name, const char *routine)
 983 {
 984 #ifdef MODEM_PARANOIA_CHECK
 985         if (!info) {
 986                 printk(KERN_WARNING "isdn_tty: null info_struct for %s in %s\n",
 987                        name, routine);
 988                 return 1;
 989         }
 990         if (info->magic != ISDN_ASYNC_MAGIC) {
 991                 printk(KERN_WARNING "isdn_tty: bad magic for modem struct %s in %s\n",
 992                        name, routine);
 993                 return 1;
 994         }
 995 #endif
 996         return 0;
 997 }
 998
 999 /*
1000  * This routine is called to set the UART divisor registers to match
1001  * the specified baud rate for a serial port.
1002  */
1003 static void
1004 isdn_tty_change_speed(modem_info *info)
1005 {
1006         struct tty_port *port = &info->port;
1007         uint cflag,
1008                 cval,
1009                 quot;
1010         int i;
1011
1012         if (!port->tty)
1013                 return;
1014         cflag = port->tty->termios.c_cflag;
1015
1016         quot = i = cflag & CBAUD;
1017         if (i & CBAUDEX) {
1018                 i &= ~CBAUDEX;
1019                 if (i < 1 || i > 2)
1020                         port->tty->termios.c_cflag &= ~CBAUDEX;
1021                 else
1022                         i += 15;
1023         }
1024         if (quot) {
1025                 info->mcr |= UART_MCR_DTR;
1026                 isdn_tty_modem_ncarrier(info);
1027         } else {
1028                 info->mcr &= ~UART_MCR_DTR;
1029                 if (info->emu.mdmreg[REG_DTRHUP] & BIT_DTRHUP) {
1030 #ifdef ISDN_DEBUG_MODEM_HUP
1031                         printk(KERN_DEBUG "Mhup in changespeed\n");
1032 #endif
1033                         if (info->online)
1034                                 info->ncarrier = 1;
1035                         isdn_tty_modem_reset_regs(info, 0);
1036                         isdn_tty_modem_hup(info, 1);
1037                 }
1038                 return;
1039         }
1040         /* byte size and parity */
1041         cval = cflag & (CSIZE | CSTOPB);
1042         cval >>= 4;
1043         if (cflag & PARENB)
1044                 cval |= UART_LCR_PARITY;
1045         if (!(cflag & PARODD))
1046                 cval |= UART_LCR_EPAR;
1047
1048         /* CTS flow control flag and modem status interrupts */
1049         if (cflag & CRTSCTS) {
1050                 port->flags |= ASYNC_CTS_FLOW;
1051         } else
1052                 port->flags &= ~ASYNC_CTS_FLOW;
1053         if (cflag & CLOCAL)
1054                 port->flags &= ~ASYNC_CHECK_CD;
1055         else {
1056                 port->flags |= ASYNC_CHECK_CD;
1057         }
1058 }
1059
1060 static int
1061 isdn_tty_startup(modem_info *info)
1062 {
1063         if (info->port.flags & ASYNC_INITIALIZED)
1064                 return 0;
1065         isdn_lock_drivers();
1066 #ifdef ISDN_DEBUG_MODEM_OPEN
1067         printk(KERN_DEBUG "starting up ttyi%d ...\n", info->line);
1068 #endif
1069         /*
1070          * Now, initialize the UART
1071          */
1072         info->mcr = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
1073         if (info->port.tty)
1074                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
1075         /*
1076          * and set the speed of the serial port
1077          */
1078         isdn_tty_change_speed(info);
1079
1080         info->port.flags |= ASYNC_INITIALIZED;
1081         info->msr |= (UART_MSR_DSR | UART_MSR_CTS);
1082         info->send_outstanding = 0;
1083         return 0;
1084 }
1085
1086 /*
1087  * This routine will shutdown a serial port; interrupts are disabled, and
1088  * DTR is dropped if the hangup on close termio flag is on.
1089  */
1090 static void
1091 isdn_tty_shutdown(modem_info *info)
1092 {
1093         if (!(info->port.flags & ASYNC_INITIALIZED))
1094                 return;
1095 #ifdef ISDN_DEBUG_MODEM_OPEN
1096         printk(KERN_DEBUG "Shutting down isdnmodem port %d ....\n", info->line);
1097 #endif
1098         isdn_unlock_drivers();
1099         info->msr &= ~UART_MSR_RI;
1100         if (!info->port.tty || (info->port.tty->termios.c_cflag & HUPCL)) {
1101                 info->mcr &= ~(UART_MCR_DTR | UART_MCR_RTS);
1102                 if (info->emu.mdmreg[REG_DTRHUP] & BIT_DTRHUP) {
1103                         isdn_tty_modem_reset_regs(info, 0);
1104 #ifdef ISDN_DEBUG_MODEM_HUP
1105                         printk(KERN_DEBUG "Mhup in isdn_tty_shutdown\n");
1106 #endif
1107                         isdn_tty_modem_hup(info, 1);
1108                 }
1109         }
1110         if (info->port.tty)
1111                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1112
1113         info->port.flags &= ~ASYNC_INITIALIZED;
1114 }
1115
1116 /* isdn_tty_write() is the main send-routine. It is called from the upper
1117  * levels within the kernel to perform sending data. Depending on the
1118  * online-flag it either directs output to the at-command-interpreter or
1119  * to the lower level. Additional tasks done here:
1120  *  - If online, check for escape-sequence (+++)
1121  *  - If sending audio-data, call isdn_tty_DLEdown() to parse DLE-codes.
1122  *  - If receiving audio-data, call isdn_tty_end_vrx() to abort if needed.
1123  *  - If dialing, abort dial.
1124  */
1125 static int
1126 isdn_tty_write(struct tty_struct *tty, const u_char *buf, int count)
1127 {
1128         int c;
1129         int total = 0;
1130         modem_info *info = (modem_info *) tty->driver_data;
1131         atemu *m = &info->emu;
1132
1133         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_write"))
1134                 return 0;
1135         /* See isdn_tty_senddown() */
1136         atomic_inc(&info->xmit_lock);
1137         while (1) {
1138                 c = count;
1139                 if (c > info->xmit_size - info->xmit_count)
1140                         c = info->xmit_size - info->xmit_count;
1141                 if (info->isdn_driver >= 0 && c > dev->drv[info->isdn_driver]->maxbufsize)
1142                         c = dev->drv[info->isdn_driver]->maxbufsize;
1143                 if (c <= 0)
1144                         break;
1145                 if ((info->online > 1)
1146 #ifdef CONFIG_ISDN_AUDIO
1147                     || (info->vonline & 3)
1148 #endif
1149                         ) {
1150 #ifdef CONFIG_ISDN_AUDIO
1151                         if (!info->vonline)
1152 #endif
1153                                 isdn_tty_check_esc(buf, m->mdmreg[REG_ESC], c,
1154                                                    &(m->pluscount),
1155                                                    &(m->lastplus));
1156                         memcpy(&info->port.xmit_buf[info->xmit_count], buf, c);
1157 #ifdef CONFIG_ISDN_AUDIO
1158                         if (info->vonline) {
1159                                 int cc = isdn_tty_handleDLEdown(info, m, c);
1160                                 if (info->vonline & 2) {
1161                                         if (!cc) {
1162                                                 /* If DLE decoding results in zero-transmit, but
1163                                                  * c originally was non-zero, do a wakeup.
1164                                                  */
1165                                                 tty_wakeup(tty);
1166                                                 info->msr |= UART_MSR_CTS;
1167                                                 info->lsr |= UART_LSR_TEMT;
1168                                         }
1169                                         info->xmit_count += cc;
1170                                 }
1171                                 if ((info->vonline & 3) == 1) {
1172                                         /* Do NOT handle Ctrl-Q or Ctrl-S
1173                                          * when in full-duplex audio mode.
1174                                          */
1175                                         if (isdn_tty_end_vrx(buf, c)) {
1176                                                 info->vonline &= ~1;
1177 #ifdef ISDN_DEBUG_MODEM_VOICE
1178                                                 printk(KERN_DEBUG
1179                                                        "got !^Q/^S, send DLE-ETX,VCON on ttyI%d\n",
1180                                                        info->line);
1181 #endif
1182                                                 isdn_tty_at_cout("\020\003\r\nVCON\r\n", info);
1183                                         }
1184                                 }
1185                         } else
1186                                 if (TTY_IS_FCLASS1(info)) {
1187                                         int cc = isdn_tty_handleDLEdown(info, m, c);
1188
1189                                         if (info->vonline & 4) { /* ETX seen */
1190                                                 isdn_ctrl c;
1191
1192                                                 c.command = ISDN_CMD_FAXCMD;
1193                                                 c.driver = info->isdn_driver;
1194                                                 c.arg = info->isdn_channel;
1195                                                 c.parm.aux.cmd = ISDN_FAX_CLASS1_CTRL;
1196                                                 c.parm.aux.subcmd = ETX;
1197                                                 isdn_command(&c);
1198                                         }
1199                                         info->vonline = 0;
1200 #ifdef ISDN_DEBUG_MODEM_VOICE
1201                                         printk(KERN_DEBUG "fax dle cc/c %d/%d\n", cc, c);
1202 #endif
1203                                         info->xmit_count += cc;
1204                                 } else
1205 #endif
1206                                         info->xmit_count += c;
1207                 } else {
1208                         info->msr |= UART_MSR_CTS;
1209                         info->lsr |= UART_LSR_TEMT;
1210                         if (info->dialing) {
1211                                 info->dialing = 0;
1212 #ifdef ISDN_DEBUG_MODEM_HUP
1213                                 printk(KERN_DEBUG "Mhup in isdn_tty_write\n");
1214 #endif
1215                                 isdn_tty_modem_result(RESULT_NO_CARRIER, info);
1216                                 isdn_tty_modem_hup(info, 1);
1217                         } else
1218                                 c = isdn_tty_edit_at(buf, c, info);
1219                 }
1220                 buf += c;
1221                 count -= c;
1222                 total += c;
1223         }
1224         atomic_dec(&info->xmit_lock);
1225         if ((info->xmit_count) || !skb_queue_empty(&info->xmit_queue)) {
1226                 if (m->mdmreg[REG_DXMT] & BIT_DXMT) {
1227                         isdn_tty_senddown(info);
1228                         isdn_tty_tint(info);
1229                 }
1230                 isdn_timer_ctrl(ISDN_TIMER_MODEMXMIT, 1);
1231         }
1232         return total;
1233 }
1234
1235 static int
1236 isdn_tty_write_room(struct tty_struct *tty)
1237 {
1238         modem_info *info = (modem_info *) tty->driver_data;
1239         int ret;
1240
1241         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_write_room"))
1242                 return 0;
1243         if (!info->online)
1244                 return info->xmit_size;
1245         ret = info->xmit_size - info->xmit_count;
1246         return (ret < 0) ? 0 : ret;
1247 }
1248
1249 static int
1250 isdn_tty_chars_in_buffer(struct tty_struct *tty)
1251 {
1252         modem_info *info = (modem_info *) tty->driver_data;
1253
1254         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_chars_in_buffer"))
1255                 return 0;
1256         if (!info->online)
1257                 return 0;
1258         return (info->xmit_count);
1259 }
1260
1261 static void
1262 isdn_tty_flush_buffer(struct tty_struct *tty)
1263 {
1264         modem_info *info;
1265
1266         if (!tty) {
1267                 return;
1268         }
1269         info = (modem_info *) tty->driver_data;
1270         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_flush_buffer")) {
1271                 return;
1272         }
1273         isdn_tty_cleanup_xmit(info);
1274         info->xmit_count = 0;
1275         tty_wakeup(tty);
1276 }
1277
1278 static void
1279 isdn_tty_flush_chars(struct tty_struct *tty)
1280 {
1281         modem_info *info = (modem_info *) tty->driver_data;
1282
1283         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_flush_chars"))
1284                 return;
1285         if ((info->xmit_count) || !skb_queue_empty(&info->xmit_queue))
1286                 isdn_timer_ctrl(ISDN_TIMER_MODEMXMIT, 1);
1287 }
1288
1289 /*
1290  * ------------------------------------------------------------
1291  * isdn_tty_throttle()
1292  *
1293  * This routine is called by the upper-layer tty layer to signal that
1294  * incoming characters should be throttled.
1295  * ------------------------------------------------------------
1296  */
1297 static void
1298 isdn_tty_throttle(struct tty_struct *tty)
1299 {
1300         modem_info *info = (modem_info *) tty->driver_data;
1301
1302         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_throttle"))
1303                 return;
1304         if (I_IXOFF(tty))
1305                 info->x_char = STOP_CHAR(tty);
1306         info->mcr &= ~UART_MCR_RTS;
1307 }
1308
1309 static void
1310 isdn_tty_unthrottle(struct tty_struct *tty)
1311 {
1312         modem_info *info = (modem_info *) tty->driver_data;
1313
1314         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_unthrottle"))
1315                 return;
1316         if (I_IXOFF(tty)) {
1317                 if (info->x_char)
1318                         info->x_char = 0;
1319                 else
1320                         info->x_char = START_CHAR(tty);
1321         }
1322         info->mcr |= UART_MCR_RTS;
1323 }
1324
1325 /*
1326  * ------------------------------------------------------------
1327  * isdn_tty_ioctl() and friends
1328  * ------------------------------------------------------------
1329  */
1330
1331 /*
1332  * isdn_tty_get_lsr_info - get line status register info
1333  *
1334  * Purpose: Let user call ioctl() to get info when the UART physically
1335  *          is emptied.  On bus types like RS485, the transmitter must
1336  *          release the bus after transmitting. This must be done when
1337  *          the transmit shift register is empty, not be done when the
1338  *          transmit holding register is empty.  This functionality
1339  *          allows RS485 driver to be written in user space.
1340  */
1341 static int
1342 isdn_tty_get_lsr_info(modem_info *info, uint __user *value)
1343 {
1344         u_char status;
1345         uint result;
1346
1347         status = info->lsr;
1348         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1349         return put_user(result, value);
1350 }
1351
1352
1353 static int
1354 isdn_tty_tiocmget(struct tty_struct *tty)
1355 {
1356         modem_info *info = (modem_info *) tty->driver_data;
1357         u_char control, status;
1358
1359         if (isdn_tty_paranoia_check(info, tty->name, __func__))
1360                 return -ENODEV;
1361         if (tty->flags & (1 << TTY_IO_ERROR))
1362                 return -EIO;
1363
1364         mutex_lock(&modem_info_mutex);
1365 #ifdef ISDN_DEBUG_MODEM_IOCTL
1366         printk(KERN_DEBUG "ttyI%d ioctl TIOCMGET\n", info->line);
1367 #endif
1368
1369         control = info->mcr;
1370         status = info->msr;
1371         mutex_unlock(&modem_info_mutex);
1372         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
1373                 | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
1374                 | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
1375                 | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
1376                 | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
1377                 | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1378 }
1379
1380 static int
1381 isdn_tty_tiocmset(struct tty_struct *tty,
1382                   unsigned int set, unsigned int clear)
1383 {
1384         modem_info *info = (modem_info *) tty->driver_data;
1385
1386         if (isdn_tty_paranoia_check(info, tty->name, __func__))
1387                 return -ENODEV;
1388         if (tty->flags & (1 << TTY_IO_ERROR))
1389                 return -EIO;
1390
1391 #ifdef ISDN_DEBUG_MODEM_IOCTL
1392         printk(KERN_DEBUG "ttyI%d ioctl TIOCMxxx: %x %x\n", info->line, set, clear);
1393 #endif
1394
1395         mutex_lock(&modem_info_mutex);
1396         if (set & TIOCM_RTS)
1397                 info->mcr |= UART_MCR_RTS;
1398         if (set & TIOCM_DTR) {
1399                 info->mcr |= UART_MCR_DTR;
1400                 isdn_tty_modem_ncarrier(info);
1401         }
1402
1403         if (clear & TIOCM_RTS)
1404                 info->mcr &= ~UART_MCR_RTS;
1405         if (clear & TIOCM_DTR) {
1406                 info->mcr &= ~UART_MCR_DTR;
1407                 if (info->emu.mdmreg[REG_DTRHUP] & BIT_DTRHUP) {
1408                         isdn_tty_modem_reset_regs(info, 0);
1409 #ifdef ISDN_DEBUG_MODEM_HUP
1410                         printk(KERN_DEBUG "Mhup in TIOCMSET\n");
1411 #endif
1412                         if (info->online)
1413                                 info->ncarrier = 1;
1414                         isdn_tty_modem_hup(info, 1);
1415                 }
1416         }
1417         mutex_unlock(&modem_info_mutex);
1418         return 0;
1419 }
1420
1421 static int
1422 isdn_tty_ioctl(struct tty_struct *tty, uint cmd, ulong arg)
1423 {
1424         modem_info *info = (modem_info *) tty->driver_data;
1425         int retval;
1426
1427         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_ioctl"))
1428                 return -ENODEV;
1429         if (tty->flags & (1 << TTY_IO_ERROR))
1430                 return -EIO;
1431         switch (cmd) {
1432         case TCSBRK:   /* SVID version: non-zero arg --> no break */
1433 #ifdef ISDN_DEBUG_MODEM_IOCTL
1434                 printk(KERN_DEBUG "ttyI%d ioctl TCSBRK\n", info->line);
1435 #endif
1436                 retval = tty_check_change(tty);
1437                 if (retval)
1438                         return retval;
1439                 tty_wait_until_sent(tty, 0);
1440                 return 0;
1441         case TCSBRKP:  /* support for POSIX tcsendbreak() */
1442 #ifdef ISDN_DEBUG_MODEM_IOCTL
1443                 printk(KERN_DEBUG "ttyI%d ioctl TCSBRKP\n", info->line);
1444 #endif
1445                 retval = tty_check_change(tty);
1446                 if (retval)
1447                         return retval;
1448                 tty_wait_until_sent(tty, 0);
1449                 return 0;
1450         case TIOCSERGETLSR:     /* Get line status register */
1451 #ifdef ISDN_DEBUG_MODEM_IOCTL
1452                 printk(KERN_DEBUG "ttyI%d ioctl TIOCSERGETLSR\n", info->line);
1453 #endif
1454                 return isdn_tty_get_lsr_info(info, (uint __user *) arg);
1455         default:
1456 #ifdef ISDN_DEBUG_MODEM_IOCTL
1457                 printk(KERN_DEBUG "UNKNOWN ioctl 0x%08x on ttyi%d\n", cmd, info->line);
1458 #endif
1459                 return -ENOIOCTLCMD;
1460         }
1461         return 0;
1462 }
1463
1464 static void
1465 isdn_tty_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1466 {
1467         modem_info *info = (modem_info *) tty->driver_data;
1468
1469         if (!old_termios)
1470                 isdn_tty_change_speed(info);
1471         else {
1472                 if (tty->termios.c_cflag == old_termios->c_cflag &&
1473                     tty->termios.c_ispeed == old_termios->c_ispeed &&
1474                     tty->termios.c_ospeed == old_termios->c_ospeed)
1475                         return;
1476                 isdn_tty_change_speed(info);
1477                 if ((old_termios->c_cflag & CRTSCTS) &&
1478                     !(tty->termios.c_cflag & CRTSCTS))
1479                         tty->hw_stopped = 0;
1480         }
1481 }
1482
1483 /*
1484  * ------------------------------------------------------------
1485  * isdn_tty_open() and friends
1486  * ------------------------------------------------------------
1487  */
1488
1489 static int isdn_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1490 {
1491         modem_info *info = &dev->mdm.info[tty->index];
1492
1493         if (isdn_tty_paranoia_check(info, tty->name, __func__))
1494                 return -ENODEV;
1495
1496         tty->driver_data = info;
1497
1498         return tty_port_install(&info->port, driver, tty);
1499 }
1500
1501 /*
1502  * This routine is called whenever a serial port is opened.  It
1503  * enables interrupts for a serial port, linking in its async structure into
1504  * the IRQ chain.   It also performs the serial-specific
1505  * initialization for the tty structure.
1506  */
1507 static int
1508 isdn_tty_open(struct tty_struct *tty, struct file *filp)
1509 {
1510         modem_info *info = tty->driver_data;
1511         struct tty_port *port = &info->port;
1512         int retval;
1513
1514 #ifdef ISDN_DEBUG_MODEM_OPEN
1515         printk(KERN_DEBUG "isdn_tty_open %s, count = %d\n", tty->name,
1516                port->count);
1517 #endif
1518         port->count++;
1519         port->tty = tty;
1520         /*
1521          * Start up serial port
1522          */
1523         retval = isdn_tty_startup(info);
1524         if (retval) {
1525 #ifdef ISDN_DEBUG_MODEM_OPEN
1526                 printk(KERN_DEBUG "isdn_tty_open return after startup\n");
1527 #endif
1528                 return retval;
1529         }
1530         retval = tty_port_block_til_ready(port, tty, filp);
1531         if (retval) {
1532 #ifdef ISDN_DEBUG_MODEM_OPEN
1533                 printk(KERN_DEBUG "isdn_tty_open return after isdn_tty_block_til_ready \n");
1534 #endif
1535                 return retval;
1536         }
1537 #ifdef ISDN_DEBUG_MODEM_OPEN
1538         printk(KERN_DEBUG "isdn_tty_open ttyi%d successful...\n", info->line);
1539 #endif
1540         dev->modempoll++;
1541 #ifdef ISDN_DEBUG_MODEM_OPEN
1542         printk(KERN_DEBUG "isdn_tty_open normal exit\n");
1543 #endif
1544         return 0;
1545 }
1546
1547 static void
1548 isdn_tty_close(struct tty_struct *tty, struct file *filp)
1549 {
1550         modem_info *info = (modem_info *) tty->driver_data;
1551         struct tty_port *port = &info->port;
1552         ulong timeout;
1553
1554         if (!info || isdn_tty_paranoia_check(info, tty->name, "isdn_tty_close"))
1555                 return;
1556         if (tty_hung_up_p(filp)) {
1557 #ifdef ISDN_DEBUG_MODEM_OPEN
1558                 printk(KERN_DEBUG "isdn_tty_close return after tty_hung_up_p\n");
1559 #endif
1560                 return;
1561         }
1562         if ((tty->count == 1) && (port->count != 1)) {
1563                 /*
1564                  * Uh, oh.  tty->count is 1, which means that the tty
1565                  * structure will be freed.  Info->count should always
1566                  * be one in these conditions.  If it's greater than
1567                  * one, we've got real problems, since it means the
1568                  * serial port won't be shutdown.
1569                  */
1570                 printk(KERN_ERR "isdn_tty_close: bad port count; tty->count is 1, "
1571                        "info->count is %d\n", port->count);
1572                 port->count = 1;
1573         }
1574         if (--port->count < 0) {
1575                 printk(KERN_ERR "isdn_tty_close: bad port count for ttyi%d: %d\n",
1576                        info->line, port->count);
1577                 port->count = 0;
1578         }
1579         if (port->count) {
1580 #ifdef ISDN_DEBUG_MODEM_OPEN
1581                 printk(KERN_DEBUG "isdn_tty_close after info->count != 0\n");
1582 #endif
1583                 return;
1584         }
1585         port->flags |= ASYNC_CLOSING;
1586
1587         tty->closing = 1;
1588         /*
1589          * At this point we stop accepting input.  To do this, we
1590          * disable the receive line status interrupts, and tell the
1591          * interrupt driver to stop checking the data ready bit in the
1592          * line status register.
1593          */
1594         if (port->flags & ASYNC_INITIALIZED) {
1595                 tty_wait_until_sent_from_close(tty, 3000);      /* 30 seconds timeout */
1596                 /*
1597                  * Before we drop DTR, make sure the UART transmitter
1598                  * has completely drained; this is especially
1599                  * important if there is a transmit FIFO!
1600                  */
1601                 timeout = jiffies + HZ;
1602                 while (!(info->lsr & UART_LSR_TEMT)) {
1603                         schedule_timeout_interruptible(20);
1604                         if (time_after(jiffies, timeout))
1605                                 break;
1606                 }
1607         }
1608         dev->modempoll--;
1609         isdn_tty_shutdown(info);
1610         isdn_tty_flush_buffer(tty);
1611         tty_ldisc_flush(tty);
1612         port->tty = NULL;
1613         info->ncarrier = 0;
1614
1615         tty_port_close_end(port, tty);
1616 #ifdef ISDN_DEBUG_MODEM_OPEN
1617         printk(KERN_DEBUG "isdn_tty_close normal exit\n");
1618 #endif
1619 }
1620
1621 /*
1622  * isdn_tty_hangup() --- called by tty_hangup() when a hangup is signaled.
1623  */
1624 static void
1625 isdn_tty_hangup(struct tty_struct *tty)
1626 {
1627         modem_info *info = (modem_info *) tty->driver_data;
1628         struct tty_port *port = &info->port;
1629
1630         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_hangup"))
1631                 return;
1632         isdn_tty_shutdown(info);
1633         port->count = 0;
1634         port->flags &= ~ASYNC_NORMAL_ACTIVE;
1635         port->tty = NULL;
1636         wake_up_interruptible(&port->open_wait);
1637 }
1638
1639 /* This routine initializes all emulator-data.
1640  */
1641 static void
1642 isdn_tty_reset_profile(atemu *m)
1643 {
1644         m->profile[0] = 0;
1645         m->profile[1] = 0;
1646         m->profile[2] = 43;
1647         m->profile[3] = 13;
1648         m->profile[4] = 10;
1649         m->profile[5] = 8;
1650         m->profile[6] = 3;
1651         m->profile[7] = 60;
1652         m->profile[8] = 2;
1653         m->profile[9] = 6;
1654         m->profile[10] = 7;
1655         m->profile[11] = 70;
1656         m->profile[12] = 0x45;
1657         m->profile[13] = 4;
1658         m->profile[14] = ISDN_PROTO_L2_X75I;
1659         m->profile[15] = ISDN_PROTO_L3_TRANS;
1660         m->profile[16] = ISDN_SERIAL_XMIT_SIZE / 16;
1661         m->profile[17] = ISDN_MODEM_WINSIZE;
1662         m->profile[18] = 4;
1663         m->profile[19] = 0;
1664         m->profile[20] = 0;
1665         m->profile[23] = 0;
1666         m->pmsn[0] = '\0';
1667         m->plmsn[0] = '\0';
1668 }
1669
1670 #ifdef CONFIG_ISDN_AUDIO
1671 static void
1672 isdn_tty_modem_reset_vpar(atemu *m)
1673 {
1674         m->vpar[0] = 2;         /* Voice-device            (2 = phone line) */
1675         m->vpar[1] = 0;         /* Silence detection level (0 = none      ) */
1676         m->vpar[2] = 70;        /* Silence interval        (7 sec.        ) */
1677         m->vpar[3] = 2;         /* Compression type        (1 = ADPCM-2   ) */
1678         m->vpar[4] = 0;         /* DTMF detection level    (0 = softcode  ) */
1679         m->vpar[5] = 8;         /* DTMF interval           (8 * 5 ms.     ) */
1680 }
1681 #endif
1682
1683 #ifdef CONFIG_ISDN_TTY_FAX
1684 static void
1685 isdn_tty_modem_reset_faxpar(modem_info *info)
1686 {
1687         T30_s *f = info->fax;
1688
1689         f->code = 0;
1690         f->phase = ISDN_FAX_PHASE_IDLE;
1691         f->direction = 0;
1692         f->resolution = 1;      /* fine */
1693         f->rate = 5;            /* 14400 bit/s */
1694         f->width = 0;
1695         f->length = 0;
1696         f->compression = 0;
1697         f->ecm = 0;
1698         f->binary = 0;
1699         f->scantime = 0;
1700         memset(&f->id[0], 32, FAXIDLEN - 1);
1701         f->id[FAXIDLEN - 1] = 0;
1702         f->badlin = 0;
1703         f->badmul = 0;
1704         f->bor = 0;
1705         f->nbc = 0;
1706         f->cq = 0;
1707         f->cr = 0;
1708         f->ctcrty = 0;
1709         f->minsp = 0;
1710         f->phcto = 30;
1711         f->rel = 0;
1712         memset(&f->pollid[0], 32, FAXIDLEN - 1);
1713         f->pollid[FAXIDLEN - 1] = 0;
1714 }
1715 #endif
1716
1717 static void
1718 isdn_tty_modem_reset_regs(modem_info *info, int force)
1719 {
1720         atemu *m = &info->emu;
1721         if ((m->mdmreg[REG_DTRR] & BIT_DTRR) || force) {
1722                 memcpy(m->mdmreg, m->profile, ISDN_MODEM_NUMREG);
1723                 memcpy(m->msn, m->pmsn, ISDN_MSNLEN);
1724                 memcpy(m->lmsn, m->plmsn, ISDN_LMSNLEN);
1725                 info->xmit_size = m->mdmreg[REG_PSIZE] * 16;
1726         }
1727 #ifdef CONFIG_ISDN_AUDIO
1728         isdn_tty_modem_reset_vpar(m);
1729 #endif
1730 #ifdef CONFIG_ISDN_TTY_FAX
1731         isdn_tty_modem_reset_faxpar(info);
1732 #endif
1733         m->mdmcmdl = 0;
1734 }
1735
1736 static void
1737 modem_write_profile(atemu *m)
1738 {
1739         memcpy(m->profile, m->mdmreg, ISDN_MODEM_NUMREG);
1740         memcpy(m->pmsn, m->msn, ISDN_MSNLEN);
1741         memcpy(m->plmsn, m->lmsn, ISDN_LMSNLEN);
1742         if (dev->profd)
1743                 send_sig(SIGIO, dev->profd, 1);
1744 }
1745
1746 static const struct tty_operations modem_ops = {
1747         .install = isdn_tty_install,
1748         .open = isdn_tty_open,
1749         .close = isdn_tty_close,
1750         .write = isdn_tty_write,
1751         .flush_chars = isdn_tty_flush_chars,
1752         .write_room = isdn_tty_write_room,
1753         .chars_in_buffer = isdn_tty_chars_in_buffer,
1754         .flush_buffer = isdn_tty_flush_buffer,
1755         .ioctl = isdn_tty_ioctl,
1756         .throttle = isdn_tty_throttle,
1757         .unthrottle = isdn_tty_unthrottle,
1758         .set_termios = isdn_tty_set_termios,
1759         .hangup = isdn_tty_hangup,
1760         .tiocmget = isdn_tty_tiocmget,
1761         .tiocmset = isdn_tty_tiocmset,
1762 };
1763
1764 static int isdn_tty_carrier_raised(struct tty_port *port)
1765 {
1766         modem_info *info = container_of(port, modem_info, port);
1767         return info->msr & UART_MSR_DCD;
1768 }
1769
1770 static const struct tty_port_operations isdn_tty_port_ops = {
1771         .carrier_raised = isdn_tty_carrier_raised,
1772 };
1773
1774 int
1775 isdn_tty_modem_init(void)
1776 {
1777         isdn_modem_t    *m;
1778         int             i, retval;
1779         modem_info      *info;
1780
1781         m = &dev->mdm;
1782         m->tty_modem = alloc_tty_driver(ISDN_MAX_CHANNELS);
1783         if (!m->tty_modem)
1784                 return -ENOMEM;
1785         m->tty_modem->name = "ttyI";
1786         m->tty_modem->major = ISDN_TTY_MAJOR;
1787         m->tty_modem->minor_start = 0;
1788         m->tty_modem->type = TTY_DRIVER_TYPE_SERIAL;
1789         m->tty_modem->subtype = SERIAL_TYPE_NORMAL;
1790         m->tty_modem->init_termios = tty_std_termios;
1791         m->tty_modem->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1792         m->tty_modem->flags = TTY_DRIVER_REAL_RAW;
1793         m->tty_modem->driver_name = "isdn_tty";
1794         tty_set_operations(m->tty_modem, &modem_ops);
1795         retval = tty_register_driver(m->tty_modem);
1796         if (retval) {
1797                 printk(KERN_WARNING "isdn_tty: Couldn't register modem-device\n");
1798                 goto err;
1799         }
1800         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1801                 info = &m->info[i];
1802 #ifdef CONFIG_ISDN_TTY_FAX
1803                 if (!(info->fax = kmalloc(sizeof(T30_s), GFP_KERNEL))) {
1804                         printk(KERN_ERR "Could not allocate fax t30-buffer\n");
1805                         retval = -ENOMEM;
1806                         goto err_unregister;
1807                 }
1808 #endif
1809                 tty_port_init(&info->port);
1810                 info->port.ops = &isdn_tty_port_ops;
1811                 spin_lock_init(&info->readlock);
1812                 sprintf(info->last_cause, "0000");
1813                 sprintf(info->last_num, "none");
1814                 info->last_dir = 0;
1815                 info->last_lhup = 1;
1816                 info->last_l2 = -1;
1817                 info->last_si = 0;
1818                 isdn_tty_reset_profile(&info->emu);
1819                 isdn_tty_modem_reset_regs(info, 1);
1820                 info->magic = ISDN_ASYNC_MAGIC;
1821                 info->line = i;
1822                 info->x_char = 0;
1823                 info->isdn_driver = -1;
1824                 info->isdn_channel = -1;
1825                 info->drv_index = -1;
1826                 info->xmit_size = ISDN_SERIAL_XMIT_SIZE;
1827                 init_timer(&info->nc_timer);
1828                 info->nc_timer.function = isdn_tty_modem_do_ncarrier;
1829                 info->nc_timer.data = (unsigned long) info;
1830                 skb_queue_head_init(&info->xmit_queue);
1831 #ifdef CONFIG_ISDN_AUDIO
1832                 skb_queue_head_init(&info->dtmf_queue);
1833 #endif
1834                 info->port.xmit_buf = kmalloc(ISDN_SERIAL_XMIT_MAX + 5,
1835                                 GFP_KERNEL);
1836                 if (!info->port.xmit_buf) {
1837                         printk(KERN_ERR "Could not allocate modem xmit-buffer\n");
1838                         retval = -ENOMEM;
1839                         goto err_unregister;
1840                 }
1841                 /* Make room for T.70 header */
1842                 info->port.xmit_buf += 4;
1843         }
1844         return 0;
1845 err_unregister:
1846         for (i--; i >= 0; i--) {
1847                 info = &m->info[i];
1848 #ifdef CONFIG_ISDN_TTY_FAX
1849                 kfree(info->fax);
1850 #endif
1851                 kfree(info->port.xmit_buf - 4);
1852         }
1853         tty_unregister_driver(m->tty_modem);
1854 err:
1855         put_tty_driver(m->tty_modem);
1856         m->tty_modem = NULL;
1857         return retval;
1858 }
1859
1860 void
1861 isdn_tty_exit(void)
1862 {
1863         modem_info *info;
1864         int i;
1865
1866         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1867                 info = &dev->mdm.info[i];
1868                 isdn_tty_cleanup_xmit(info);
1869 #ifdef CONFIG_ISDN_TTY_FAX
1870                 kfree(info->fax);
1871 #endif
1872                 kfree(info->port.xmit_buf - 4);
1873         }
1874         tty_unregister_driver(dev->mdm.tty_modem);
1875         put_tty_driver(dev->mdm.tty_modem);
1876         dev->mdm.tty_modem = NULL;
1877 }
1878
1879
1880 /*
1881  * isdn_tty_match_icall(char *MSN, atemu *tty_emulator, int dev_idx)
1882  *      match the MSN against the MSNs (glob patterns) defined for tty_emulator,
1883  *      and return 0 for match, 1 for no match, 2 if MSN could match if longer.
1884  */
1885
1886 static int
1887 isdn_tty_match_icall(char *cid, atemu *emu, int di)
1888 {
1889 #ifdef ISDN_DEBUG_MODEM_ICALL
1890         printk(KERN_DEBUG "m_fi: msn=%s lmsn=%s mmsn=%s mreg[SI1]=%d mreg[SI2]=%d\n",
1891                emu->msn, emu->lmsn, isdn_map_eaz2msn(emu->msn, di),
1892                emu->mdmreg[REG_SI1], emu->mdmreg[REG_SI2]);
1893 #endif
1894         if (strlen(emu->lmsn)) {
1895                 char *p = emu->lmsn;
1896                 char *q;
1897                 int  tmp;
1898                 int  ret = 0;
1899
1900                 while (1) {
1901                         if ((q = strchr(p, ';')))
1902                                 *q = '\0';
1903                         if ((tmp = isdn_msncmp(cid, isdn_map_eaz2msn(p, di))) > ret)
1904                                 ret = tmp;
1905 #ifdef ISDN_DEBUG_MODEM_ICALL
1906                         printk(KERN_DEBUG "m_fi: lmsnX=%s mmsn=%s -> tmp=%d\n",
1907                                p, isdn_map_eaz2msn(emu->msn, di), tmp);
1908 #endif
1909                         if (q) {
1910                                 *q = ';';
1911                                 p = q;
1912                                 p++;
1913                         }
1914                         if (!tmp)
1915                                 return 0;
1916                         if (!q)
1917                                 break;
1918                 }
1919                 return ret;
1920         } else {
1921                 int tmp;
1922                 tmp = isdn_msncmp(cid, isdn_map_eaz2msn(emu->msn, di));
1923 #ifdef ISDN_DEBUG_MODEM_ICALL
1924                 printk(KERN_DEBUG "m_fi: mmsn=%s -> tmp=%d\n",
1925                        isdn_map_eaz2msn(emu->msn, di), tmp);
1926 #endif
1927                 return tmp;
1928         }
1929 }
1930
1931 /*
1932  * An incoming call-request has arrived.
1933  * Search the tty-devices for an appropriate device and bind
1934  * it to the ISDN-Channel.
1935  * Return:
1936  *
1937  *  0 = No matching device found.
1938  *  1 = A matching device found.
1939  *  3 = No match found, but eventually would match, if
1940  *      CID is longer.
1941  */
1942 int
1943 isdn_tty_find_icall(int di, int ch, setup_parm *setup)
1944 {
1945         char *eaz;
1946         int i;
1947         int wret;
1948         int idx;
1949         int si1;
1950         int si2;
1951         char *nr;
1952         ulong flags;
1953
1954         if (!setup->phone[0]) {
1955                 nr = "0";
1956                 printk(KERN_INFO "isdn_tty: Incoming call without OAD, assuming '0'\n");
1957         } else
1958                 nr = setup->phone;
1959         si1 = (int) setup->si1;
1960         si2 = (int) setup->si2;
1961         if (!setup->eazmsn[0]) {
1962                 printk(KERN_WARNING "isdn_tty: Incoming call without CPN, assuming '0'\n");
1963                 eaz = "0";
1964         } else
1965                 eaz = setup->eazmsn;
1966 #ifdef ISDN_DEBUG_MODEM_ICALL
1967         printk(KERN_DEBUG "m_fi: eaz=%s si1=%d si2=%d\n", eaz, si1, si2);
1968 #endif
1969         wret = 0;
1970         spin_lock_irqsave(&dev->lock, flags);
1971         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1972                 modem_info *info = &dev->mdm.info[i];
1973
1974                 if (info->port.count == 0)
1975                         continue;
1976                 if ((info->emu.mdmreg[REG_SI1] & si2bit[si1]) &&  /* SI1 is matching */
1977                     (info->emu.mdmreg[REG_SI2] == si2)) {         /* SI2 is matching */
1978                         idx = isdn_dc2minor(di, ch);
1979 #ifdef ISDN_DEBUG_MODEM_ICALL
1980                         printk(KERN_DEBUG "m_fi: match1 wret=%d\n", wret);
1981                         printk(KERN_DEBUG "m_fi: idx=%d flags=%08lx drv=%d ch=%d usg=%d\n", idx,
1982                                info->port.flags, info->isdn_driver,
1983                                info->isdn_channel, dev->usage[idx]);
1984 #endif
1985                         if (
1986 #ifndef FIX_FILE_TRANSFER
1987                                 (info->port.flags & ASYNC_NORMAL_ACTIVE) &&
1988 #endif
1989                                 (info->isdn_driver == -1) &&
1990                                 (info->isdn_channel == -1) &&
1991                                 (USG_NONE(dev->usage[idx]))) {
1992                                 int matchret;
1993
1994                                 if ((matchret = isdn_tty_match_icall(eaz, &info->emu, di)) > wret)
1995                                         wret = matchret;
1996                                 if (!matchret) {                  /* EAZ is matching */
1997                                         info->isdn_driver = di;
1998                                         info->isdn_channel = ch;
1999                                         info->drv_index = idx;
2000                                         dev->m_idx[idx] = info->line;
2001                                         dev->usage[idx] &= ISDN_USAGE_EXCLUSIVE;
2002                                         dev->usage[idx] |= isdn_calc_usage(si1, info->emu.mdmreg[REG_L2PROT]);
2003                                         strcpy(dev->num[idx], nr);
2004                                         strcpy(info->emu.cpn, eaz);
2005                                         info->emu.mdmreg[REG_SI1I] = si2bit[si1];
2006                                         info->emu.mdmreg[REG_PLAN] = setup->plan;
2007                                         info->emu.mdmreg[REG_SCREEN] = setup->screen;
2008                                         isdn_info_update();
2009                                         spin_unlock_irqrestore(&dev->lock, flags);
2010                                         printk(KERN_INFO "isdn_tty: call from %s, -> RING on ttyI%d\n", nr,
2011                                                info->line);
2012                                         info->msr |= UART_MSR_RI;
2013                                         isdn_tty_modem_result(RESULT_RING, info);
2014                                         isdn_timer_ctrl(ISDN_TIMER_MODEMRING, 1);
2015                                         return 1;
2016                                 }
2017                         }
2018                 }
2019         }
2020         spin_unlock_irqrestore(&dev->lock, flags);
2021         printk(KERN_INFO "isdn_tty: call from %s -> %s %s\n", nr, eaz,
2022                ((dev->drv[di]->flags & DRV_FLAG_REJBUS) && (wret != 2)) ? "rejected" : "ignored");
2023         return (wret == 2) ? 3 : 0;
2024 }
2025
2026 #define TTY_IS_ACTIVE(info)     (info->port.flags & ASYNC_NORMAL_ACTIVE)
2027
2028 int
2029 isdn_tty_stat_callback(int i, isdn_ctrl *c)
2030 {
2031         int mi;
2032         modem_info *info;
2033         char *e;
2034
2035         if (i < 0)
2036                 return 0;
2037         if ((mi = dev->m_idx[i]) >= 0) {
2038                 info = &dev->mdm.info[mi];
2039                 switch (c->command) {
2040                 case ISDN_STAT_CINF:
2041                         printk(KERN_DEBUG "CHARGEINFO on ttyI%d: %ld %s\n", info->line, c->arg, c->parm.num);
2042                         info->emu.charge = (unsigned) simple_strtoul(c->parm.num, &e, 10);
2043                         if (e == (char *)c->parm.num)
2044                                 info->emu.charge = 0;
2045
2046                         break;
2047                 case ISDN_STAT_BSENT:
2048 #ifdef ISDN_TTY_STAT_DEBUG
2049                         printk(KERN_DEBUG "tty_STAT_BSENT ttyI%d\n", info->line);
2050 #endif
2051                         if ((info->isdn_driver == c->driver) &&
2052                             (info->isdn_channel == c->arg)) {
2053                                 info->msr |= UART_MSR_CTS;
2054                                 if (info->send_outstanding)
2055                                         if (!(--info->send_outstanding))
2056                                                 info->lsr |= UART_LSR_TEMT;
2057                                 isdn_tty_tint(info);
2058                                 return 1;
2059                         }
2060                         break;
2061                 case ISDN_STAT_CAUSE:
2062 #ifdef ISDN_TTY_STAT_DEBUG
2063                         printk(KERN_DEBUG "tty_STAT_CAUSE ttyI%d\n", info->line);
2064 #endif
2065                         /* Signal cause to tty-device */
2066                         strncpy(info->last_cause, c->parm.num, 5);
2067                         return 1;
2068                 case ISDN_STAT_DISPLAY:
2069 #ifdef ISDN_TTY_STAT_DEBUG
2070                         printk(KERN_DEBUG "tty_STAT_DISPLAY ttyI%d\n", info->line);
2071 #endif
2072                         /* Signal display to tty-device */
2073                         if ((info->emu.mdmreg[REG_DISPLAY] & BIT_DISPLAY) &&
2074                             !(info->emu.mdmreg[REG_RESPNUM] & BIT_RESPNUM)) {
2075                                 isdn_tty_at_cout("\r\n", info);
2076                                 isdn_tty_at_cout("DISPLAY: ", info);
2077                                 isdn_tty_at_cout(c->parm.display, info);
2078                                 isdn_tty_at_cout("\r\n", info);
2079                         }
2080                         return 1;
2081                 case ISDN_STAT_DCONN:
2082 #ifdef ISDN_TTY_STAT_DEBUG
2083                         printk(KERN_DEBUG "tty_STAT_DCONN ttyI%d\n", info->line);
2084 #endif
2085                         if (TTY_IS_ACTIVE(info)) {
2086                                 if (info->dialing == 1) {
2087                                         info->dialing = 2;
2088                                         return 1;
2089                                 }
2090                         }
2091                         break;
2092                 case ISDN_STAT_DHUP:
2093 #ifdef ISDN_TTY_STAT_DEBUG
2094                         printk(KERN_DEBUG "tty_STAT_DHUP ttyI%d\n", info->line);
2095 #endif
2096                         if (TTY_IS_ACTIVE(info)) {
2097                                 if (info->dialing == 1)
2098                                         isdn_tty_modem_result(RESULT_BUSY, info);
2099                                 if (info->dialing > 1)
2100                                         isdn_tty_modem_result(RESULT_NO_CARRIER, info);
2101                                 info->dialing = 0;
2102 #ifdef ISDN_DEBUG_MODEM_HUP
2103                                 printk(KERN_DEBUG "Mhup in ISDN_STAT_DHUP\n");
2104 #endif
2105                                 isdn_tty_modem_hup(info, 0);
2106                                 return 1;
2107                         }
2108                         break;
2109                 case ISDN_STAT_BCONN:
2110 #ifdef ISDN_TTY_STAT_DEBUG
2111                         printk(KERN_DEBUG "tty_STAT_BCONN ttyI%d\n", info->line);
2112 #endif
2113                         /* Wake up any processes waiting
2114                          * for incoming call of this device when
2115                          * DCD follow the state of incoming carrier
2116                          */
2117                         if (info->port.blocked_open &&
2118                             (info->emu.mdmreg[REG_DCD] & BIT_DCD)) {
2119                                 wake_up_interruptible(&info->port.open_wait);
2120                         }
2121
2122                         /* Schedule CONNECT-Message to any tty
2123                          * waiting for it and
2124                          * set DCD-bit of its modem-status.
2125                          */
2126                         if (TTY_IS_ACTIVE(info) ||
2127                             (info->port.blocked_open &&
2128                              (info->emu.mdmreg[REG_DCD] & BIT_DCD))) {
2129                                 info->msr |= UART_MSR_DCD;
2130                                 info->emu.charge = 0;
2131                                 if (info->dialing & 0xf)
2132                                         info->last_dir = 1;
2133                                 else
2134                                         info->last_dir = 0;
2135                                 info->dialing = 0;
2136                                 info->rcvsched = 1;
2137                                 if (USG_MODEM(dev->usage[i])) {
2138                                         if (info->emu.mdmreg[REG_L2PROT] == ISDN_PROTO_L2_MODEM) {
2139                                                 strcpy(info->emu.connmsg, c->parm.num);
2140                                                 isdn_tty_modem_result(RESULT_CONNECT, info);
2141                                         } else
2142                                                 isdn_tty_modem_result(RESULT_CONNECT64000, info);
2143                                 }
2144                                 if (USG_VOICE(dev->usage[i]))
2145                                         isdn_tty_modem_result(RESULT_VCON, info);
2146                                 return 1;
2147                         }
2148                         break;
2149                 case ISDN_STAT_BHUP:
2150 #ifdef ISDN_TTY_STAT_DEBUG
2151                         printk(KERN_DEBUG "tty_STAT_BHUP ttyI%d\n", info->line);
2152 #endif
2153                         if (TTY_IS_ACTIVE(info)) {
2154 #ifdef ISDN_DEBUG_MODEM_HUP
2155                                 printk(KERN_DEBUG "Mhup in ISDN_STAT_BHUP\n");
2156 #endif
2157                                 isdn_tty_modem_hup(info, 0);
2158                                 return 1;
2159                         }
2160                         break;
2161                 case ISDN_STAT_NODCH:
2162 #ifdef ISDN_TTY_STAT_DEBUG
2163                         printk(KERN_DEBUG "tty_STAT_NODCH ttyI%d\n", info->line);
2164 #endif
2165                         if (TTY_IS_ACTIVE(info)) {
2166                                 if (info->dialing) {
2167                                         info->dialing = 0;
2168                                         info->last_l2 = -1;
2169                                         info->last_si = 0;
2170                                         sprintf(info->last_cause, "0000");
2171                                         isdn_tty_modem_result(RESULT_NO_DIALTONE, info);
2172                                 }
2173                                 isdn_tty_modem_hup(info, 0);
2174                                 return 1;
2175                         }
2176                         break;
2177                 case ISDN_STAT_UNLOAD:
2178 #ifdef ISDN_TTY_STAT_DEBUG
2179                         printk(KERN_DEBUG "tty_STAT_UNLOAD ttyI%d\n", info->line);
2180 #endif
2181                         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
2182                                 info = &dev->mdm.info[i];
2183                                 if (info->isdn_driver == c->driver) {
2184                                         if (info->online)
2185                                                 isdn_tty_modem_hup(info, 1);
2186                                 }
2187                         }
2188                         return 1;
2189 #ifdef CONFIG_ISDN_TTY_FAX
2190                 case ISDN_STAT_FAXIND:
2191                         if (TTY_IS_ACTIVE(info)) {
2192                                 isdn_tty_fax_command(info, c);
2193                         }
2194                         break;
2195 #endif
2196 #ifdef CONFIG_ISDN_AUDIO
2197                 case ISDN_STAT_AUDIO:
2198                         if (TTY_IS_ACTIVE(info)) {
2199                                 switch (c->parm.num[0]) {
2200                                 case ISDN_AUDIO_DTMF:
2201                                         if (info->vonline) {
2202                                                 isdn_audio_put_dle_code(info,
2203                                                                         c->parm.num[1]);
2204                                         }
2205                                         break;
2206                                 }
2207                         }
2208                         break;
2209 #endif
2210                 }
2211         }
2212         return 0;
2213 }
2214
2215 /*********************************************************************
2216  Modem-Emulator-Routines
2217 *********************************************************************/
2218
2219 #define cmdchar(c) ((c >= ' ') && (c <= 0x7f))
2220
2221 /*
2222  * Put a message from the AT-emulator into receive-buffer of tty,
2223  * convert CR, LF, and BS to values in modem-registers 3, 4 and 5.
2224  */
2225 void
2226 isdn_tty_at_cout(char *msg, modem_info *info)
2227 {
2228         struct tty_struct *tty;
2229         atemu *m = &info->emu;
2230         char *p;
2231         char c;
2232         u_long flags;
2233         struct sk_buff *skb = NULL;
2234         char *sp = NULL;
2235         int l;
2236
2237         if (!msg) {
2238                 printk(KERN_WARNING "isdn_tty: Null-Message in isdn_tty_at_cout\n");
2239                 return;
2240         }
2241
2242         l = strlen(msg);
2243
2244         spin_lock_irqsave(&info->readlock, flags);
2245         tty = info->port.tty;
2246         if ((info->port.flags & ASYNC_CLOSING) || (!tty)) {
2247                 spin_unlock_irqrestore(&info->readlock, flags);
2248                 return;
2249         }
2250
2251         /* use queue instead of direct, if online and */
2252         /* data is in queue or buffer is full */
2253         if (info->online && ((tty_buffer_request_room(tty, l) < l) ||
2254                              !skb_queue_empty(&dev->drv[info->isdn_driver]->rpqueue[info->isdn_channel]))) {
2255                 skb = alloc_skb(l, GFP_ATOMIC);
2256                 if (!skb) {
2257                         spin_unlock_irqrestore(&info->readlock, flags);
2258                         return;
2259                 }
2260                 sp = skb_put(skb, l);
2261 #ifdef CONFIG_ISDN_AUDIO
2262                 ISDN_AUDIO_SKB_DLECOUNT(skb) = 0;
2263                 ISDN_AUDIO_SKB_LOCK(skb) = 0;
2264 #endif
2265         }
2266
2267         for (p = msg; *p; p++) {
2268                 switch (*p) {
2269                 case '\r':
2270                         c = m->mdmreg[REG_CR];
2271                         break;
2272                 case '\n':
2273                         c = m->mdmreg[REG_LF];
2274                         break;
2275                 case '\b':
2276                         c = m->mdmreg[REG_BS];
2277                         break;
2278                 default:
2279                         c = *p;
2280                 }
2281                 if (skb) {
2282                         *sp++ = c;
2283                 } else {
2284                         if (tty_insert_flip_char(tty, c, TTY_NORMAL) == 0)
2285                                 break;
2286                 }
2287         }
2288         if (skb) {
2289                 __skb_queue_tail(&dev->drv[info->isdn_driver]->rpqueue[info->isdn_channel], skb);
2290                 dev->drv[info->isdn_driver]->rcvcount[info->isdn_channel] += skb->len;
2291                 spin_unlock_irqrestore(&info->readlock, flags);
2292                 /* Schedule dequeuing */
2293                 if (dev->modempoll && info->rcvsched)
2294                         isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 1);
2295
2296         } else {
2297                 spin_unlock_irqrestore(&info->readlock, flags);
2298                 tty_flip_buffer_push(tty);
2299         }
2300 }
2301
2302 /*
2303  * Perform ATH Hangup
2304  */
2305 static void
2306 isdn_tty_on_hook(modem_info *info)
2307 {
2308         if (info->isdn_channel >= 0) {
2309 #ifdef ISDN_DEBUG_MODEM_HUP
2310                 printk(KERN_DEBUG "Mhup in isdn_tty_on_hook\n");
2311 #endif
2312                 isdn_tty_modem_hup(info, 1);
2313         }
2314 }
2315
2316 static void
2317 isdn_tty_off_hook(void)
2318 {
2319         printk(KERN_DEBUG "isdn_tty_off_hook\n");
2320 }
2321
2322 #define PLUSWAIT1 (HZ / 2)      /* 0.5 sec. */
2323 #define PLUSWAIT2 (HZ * 3 / 2)  /* 1.5 sec */
2324
2325 /*
2326  * Check Buffer for Modem-escape-sequence, activate timer-callback to
2327  * isdn_tty_modem_escape() if sequence found.
2328  *
2329  * Parameters:
2330  *   p          pointer to databuffer
2331  *   plus       escape-character
2332  *   count      length of buffer
2333  *   pluscount  count of valid escape-characters so far
2334  *   lastplus   timestamp of last character
2335  */
2336 static void
2337 isdn_tty_check_esc(const u_char *p, u_char plus, int count, int *pluscount,
2338                    u_long *lastplus)
2339 {
2340         if (plus > 127)
2341                 return;
2342         if (count > 3) {
2343                 p += count - 3;
2344                 count = 3;
2345                 *pluscount = 0;
2346         }
2347         while (count > 0) {
2348                 if (*(p++) == plus) {
2349                         if ((*pluscount)++) {
2350                                 /* Time since last '+' > 0.5 sec. ? */
2351                                 if (time_after(jiffies, *lastplus + PLUSWAIT1))
2352                                         *pluscount = 1;
2353                         } else {
2354                                 /* Time since last non-'+' < 1.5 sec. ? */
2355                                 if (time_before(jiffies, *lastplus + PLUSWAIT2))
2356                                         *pluscount = 0;
2357                         }
2358                         if ((*pluscount == 3) && (count == 1))
2359                                 isdn_timer_ctrl(ISDN_TIMER_MODEMPLUS, 1);
2360                         if (*pluscount > 3)
2361                                 *pluscount = 1;
2362                 } else
2363                         *pluscount = 0;
2364                 *lastplus = jiffies;
2365                 count--;
2366         }
2367 }
2368
2369 /*
2370  * Return result of AT-emulator to tty-receive-buffer, depending on
2371  * modem-register 12, bit 0 and 1.
2372  * For CONNECT-messages also switch to online-mode.
2373  * For RING-message handle auto-ATA if register 0 != 0
2374  */
2375
2376 static void
2377 isdn_tty_modem_result(int code, modem_info *info)
2378 {
2379         atemu *m = &info->emu;
2380         static char *msg[] =
2381                 {"OK", "CONNECT", "RING", "NO CARRIER", "ERROR",
2382                  "CONNECT 64000", "NO DIALTONE", "BUSY", "NO ANSWER",
2383                  "RINGING", "NO MSN/EAZ", "VCON", "RUNG"};
2384         char s[ISDN_MSNLEN + 10];
2385
2386         switch (code) {
2387         case RESULT_RING:
2388                 m->mdmreg[REG_RINGCNT]++;
2389                 if (m->mdmreg[REG_RINGCNT] == m->mdmreg[REG_RINGATA])
2390                         /* Automatically accept incoming call */
2391                         isdn_tty_cmd_ATA(info);
2392                 break;
2393         case RESULT_NO_CARRIER:
2394 #ifdef ISDN_DEBUG_MODEM_HUP
2395                 printk(KERN_DEBUG "modem_result: NO CARRIER %d %d\n",
2396                        (info->port.flags & ASYNC_CLOSING),
2397                        (!info->port.tty));
2398 #endif
2399                 m->mdmreg[REG_RINGCNT] = 0;
2400                 del_timer(&info->nc_timer);
2401                 info->ncarrier = 0;
2402                 if ((info->port.flags & ASYNC_CLOSING) || (!info->port.tty))
2403                         return;
2404
2405 #ifdef CONFIG_ISDN_AUDIO
2406                 if (info->vonline & 1) {
2407 #ifdef ISDN_DEBUG_MODEM_VOICE
2408                         printk(KERN_DEBUG "res3: send DLE-ETX on ttyI%d\n",
2409                                info->line);
2410 #endif
2411                         /* voice-recording, add DLE-ETX */
2412                         isdn_tty_at_cout("\020\003", info);
2413                 }
2414                 if (info->vonline & 2) {
2415 #ifdef ISDN_DEBUG_MODEM_VOICE
2416                         printk(KERN_DEBUG "res3: send DLE-DC4 on ttyI%d\n",
2417                                info->line);
2418 #endif
2419                         /* voice-playing, add DLE-DC4 */
2420                         isdn_tty_at_cout("\020\024", info);
2421                 }
2422 #endif
2423                 break;
2424         case RESULT_CONNECT:
2425         case RESULT_CONNECT64000:
2426                 sprintf(info->last_cause, "0000");
2427                 if (!info->online)
2428                         info->online = 2;
2429                 break;
2430         case RESULT_VCON:
2431 #ifdef ISDN_DEBUG_MODEM_VOICE
2432                 printk(KERN_DEBUG "res3: send VCON on ttyI%d\n",
2433                        info->line);
2434 #endif
2435                 sprintf(info->last_cause, "0000");
2436                 if (!info->online)
2437                         info->online = 1;
2438                 break;
2439         } /* switch (code) */
2440
2441         if (m->mdmreg[REG_RESP] & BIT_RESP) {
2442                 /* Show results */
2443                 if (m->mdmreg[REG_RESPNUM] & BIT_RESPNUM) {
2444                         /* Show numeric results only */
2445                         sprintf(s, "\r\n%d\r\n", code);
2446                         isdn_tty_at_cout(s, info);
2447                 } else {
2448                         if (code == RESULT_RING) {
2449                                 /* return if "show RUNG" and ringcounter>1 */
2450                                 if ((m->mdmreg[REG_RUNG] & BIT_RUNG) &&
2451                                     (m->mdmreg[REG_RINGCNT] > 1))
2452                                         return;
2453                                 /* print CID, _before_ _every_ ring */
2454                                 if (!(m->mdmreg[REG_CIDONCE] & BIT_CIDONCE)) {
2455                                         isdn_tty_at_cout("\r\nCALLER NUMBER: ", info);
2456                                         isdn_tty_at_cout(dev->num[info->drv_index], info);
2457                                         if (m->mdmreg[REG_CDN] & BIT_CDN) {
2458                                                 isdn_tty_at_cout("\r\nCALLED NUMBER: ", info);
2459                                                 isdn_tty_at_cout(info->emu.cpn, info);
2460                                         }
2461                                 }
2462                         }
2463                         isdn_tty_at_cout("\r\n", info);
2464                         isdn_tty_at_cout(msg[code], info);
2465                         switch (code) {
2466                         case RESULT_CONNECT:
2467                                 switch (m->mdmreg[REG_L2PROT]) {
2468                                 case ISDN_PROTO_L2_MODEM:
2469                                         isdn_tty_at_cout(" ", info);
2470                                         isdn_tty_at_cout(m->connmsg, info);
2471                                         break;
2472                                 }
2473                                 break;
2474                         case RESULT_RING:
2475                                 /* Append CPN, if enabled */
2476                                 if ((m->mdmreg[REG_CPN] & BIT_CPN)) {
2477                                         sprintf(s, "/%s", m->cpn);
2478                                         isdn_tty_at_cout(s, info);
2479                                 }
2480                                 /* Print CID only once, _after_ 1st RING */
2481                                 if ((m->mdmreg[REG_CIDONCE] & BIT_CIDONCE) &&
2482                                     (m->mdmreg[REG_RINGCNT] == 1)) {
2483                                         isdn_tty_at_cout("\r\n", info);
2484                                         isdn_tty_at_cout("CALLER NUMBER: ", info);
2485                                         isdn_tty_at_cout(dev->num[info->drv_index], info);
2486                                         if (m->mdmreg[REG_CDN] & BIT_CDN) {
2487                                                 isdn_tty_at_cout("\r\nCALLED NUMBER: ", info);
2488                                                 isdn_tty_at_cout(info->emu.cpn, info);
2489                                         }
2490                                 }
2491                                 break;
2492                         case RESULT_NO_CARRIER:
2493                         case RESULT_NO_DIALTONE:
2494                         case RESULT_BUSY:
2495                         case RESULT_NO_ANSWER:
2496                                 m->mdmreg[REG_RINGCNT] = 0;
2497                                 /* Append Cause-Message if enabled */
2498                                 if (m->mdmreg[REG_RESPXT] & BIT_RESPXT) {
2499                                         sprintf(s, "/%s", info->last_cause);
2500                                         isdn_tty_at_cout(s, info);
2501                                 }
2502                                 break;
2503                         case RESULT_CONNECT64000:
2504                                 /* Append Protocol to CONNECT message */
2505                                 switch (m->mdmreg[REG_L2PROT]) {
2506                                 case ISDN_PROTO_L2_X75I:
2507                                 case ISDN_PROTO_L2_X75UI:
2508                                 case ISDN_PROTO_L2_X75BUI:
2509                                         isdn_tty_at_cout("/X.75", info);
2510                                         break;
2511                                 case ISDN_PROTO_L2_HDLC:
2512                                         isdn_tty_at_cout("/HDLC", info);
2513                                         break;
2514                                 case ISDN_PROTO_L2_V11096:
2515                                         isdn_tty_at_cout("/V110/9600", info);
2516                                         break;
2517                                 case ISDN_PROTO_L2_V11019:
2518                                         isdn_tty_at_cout("/V110/19200", info);
2519                                         break;
2520                                 case ISDN_PROTO_L2_V11038:
2521                                         isdn_tty_at_cout("/V110/38400", info);
2522                                         break;
2523                                 }
2524                                 if (m->mdmreg[REG_T70] & BIT_T70) {
2525                                         isdn_tty_at_cout("/T.70", info);
2526                                         if (m->mdmreg[REG_T70] & BIT_T70_EXT)
2527                                                 isdn_tty_at_cout("+", info);
2528                                 }
2529                                 break;
2530                         }
2531                         isdn_tty_at_cout("\r\n", info);
2532                 }
2533         }
2534         if (code == RESULT_NO_CARRIER) {
2535                 if ((info->port.flags & ASYNC_CLOSING) || (!info->port.tty))
2536                         return;
2537
2538                 if (info->port.flags & ASYNC_CHECK_CD)
2539                         tty_hangup(info->port.tty);
2540         }
2541 }
2542
2543
2544 /*
2545  * Display a modem-register-value.
2546  */
2547 static void
2548 isdn_tty_show_profile(int ridx, modem_info *info)
2549 {
2550         char v[6];
2551
2552         sprintf(v, "\r\n%d", info->emu.mdmreg[ridx]);
2553         isdn_tty_at_cout(v, info);
2554 }
2555
2556 /*
2557  * Get MSN-string from char-pointer, set pointer to end of number
2558  */
2559 static void
2560 isdn_tty_get_msnstr(char *n, char **p)
2561 {
2562         int limit = ISDN_MSNLEN - 1;
2563
2564         while (((*p[0] >= '0' && *p[0] <= '9') ||
2565                 /* Why a comma ??? */
2566                 (*p[0] == ',') || (*p[0] == ':')) &&
2567                (limit--))
2568                 *n++ = *p[0]++;
2569         *n = '\0';
2570 }
2571
2572 /*
2573  * Get phone-number from modem-commandbuffer
2574  */
2575 static void
2576 isdn_tty_getdial(char *p, char *q, int cnt)
2577 {
2578         int first = 1;
2579         int limit = ISDN_MSNLEN - 1;    /* MUST match the size of interface var to avoid
2580                                            buffer overflow */
2581
2582         while (strchr(" 0123456789,#.*WPTSR-", *p) && *p && --cnt > 0) {
2583                 if ((*p >= '0' && *p <= '9') || ((*p == 'S') && first) ||
2584                     ((*p == 'R') && first) ||
2585                     (*p == '*') || (*p == '#')) {
2586                         *q++ = *p;
2587                         limit--;
2588                 }
2589                 if (!limit)
2590                         break;
2591                 p++;
2592                 first = 0;
2593         }
2594         *q = 0;
2595 }
2596
2597 #define PARSE_ERROR { isdn_tty_modem_result(RESULT_ERROR, info); return; }
2598 #define PARSE_ERROR1 { isdn_tty_modem_result(RESULT_ERROR, info); return 1; }
2599
2600 static void
2601 isdn_tty_report(modem_info *info)
2602 {
2603         atemu *m = &info->emu;
2604         char s[80];
2605
2606         isdn_tty_at_cout("\r\nStatistics of last connection:\r\n\r\n", info);
2607         sprintf(s, "    Remote Number:    %s\r\n", info->last_num);
2608         isdn_tty_at_cout(s, info);
2609         sprintf(s, "    Direction:        %s\r\n", info->last_dir ? "outgoing" : "incoming");
2610         isdn_tty_at_cout(s, info);
2611         isdn_tty_at_cout("    Layer-2 Protocol: ", info);
2612         switch (info->last_l2) {
2613         case ISDN_PROTO_L2_X75I:
2614                 isdn_tty_at_cout("X.75i", info);
2615                 break;
2616         case ISDN_PROTO_L2_X75UI:
2617                 isdn_tty_at_cout("X.75ui", info);
2618                 break;
2619         case ISDN_PROTO_L2_X75BUI:
2620                 isdn_tty_at_cout("X.75bui", info);
2621                 break;
2622         case ISDN_PROTO_L2_HDLC:
2623                 isdn_tty_at_cout("HDLC", info);
2624                 break;
2625         case ISDN_PROTO_L2_V11096:
2626                 isdn_tty_at_cout("V.110 9600 Baud", info);
2627                 break;
2628         case ISDN_PROTO_L2_V11019:
2629                 isdn_tty_at_cout("V.110 19200 Baud", info);
2630                 break;
2631         case ISDN_PROTO_L2_V11038:
2632                 isdn_tty_at_cout("V.110 38400 Baud", info);
2633                 break;
2634         case ISDN_PROTO_L2_TRANS:
2635                 isdn_tty_at_cout("transparent", info);
2636                 break;
2637         case ISDN_PROTO_L2_MODEM:
2638                 isdn_tty_at_cout("modem", info);
2639                 break;
2640         case ISDN_PROTO_L2_FAX:
2641                 isdn_tty_at_cout("fax", info);
2642                 break;
2643         default:
2644                 isdn_tty_at_cout("unknown", info);
2645                 break;
2646         }
2647         if (m->mdmreg[REG_T70] & BIT_T70) {
2648                 isdn_tty_at_cout("/T.70", info);
2649                 if (m->mdmreg[REG_T70] & BIT_T70_EXT)
2650                         isdn_tty_at_cout("+", info);
2651         }
2652         isdn_tty_at_cout("\r\n", info);
2653         isdn_tty_at_cout("    Service:          ", info);
2654         switch (info->last_si) {
2655         case 1:
2656                 isdn_tty_at_cout("audio\r\n", info);
2657                 break;
2658         case 5:
2659                 isdn_tty_at_cout("btx\r\n", info);
2660                 break;
2661         case 7:
2662                 isdn_tty_at_cout("data\r\n", info);
2663                 break;
2664         default:
2665                 sprintf(s, "%d\r\n", info->last_si);
2666                 isdn_tty_at_cout(s, info);
2667                 break;
2668         }
2669         sprintf(s, "    Hangup location:  %s\r\n", info->last_lhup ? "local" : "remote");
2670         isdn_tty_at_cout(s, info);
2671         sprintf(s, "    Last cause:       %s\r\n", info->last_cause);
2672         isdn_tty_at_cout(s, info);
2673 }
2674
2675 /*
2676  * Parse AT&.. commands.
2677  */
2678 static int
2679 isdn_tty_cmd_ATand(char **p, modem_info *info)
2680 {
2681         atemu *m = &info->emu;
2682         int i;
2683         char rb[100];
2684
2685 #define MAXRB (sizeof(rb) - 1)
2686
2687         switch (*p[0]) {
2688         case 'B':
2689                 /* &B - Set Buffersize */
2690                 p[0]++;
2691                 i = isdn_getnum(p);
2692                 if ((i < 0) || (i > ISDN_SERIAL_XMIT_MAX))
2693                         PARSE_ERROR1;
2694 #ifdef CONFIG_ISDN_AUDIO
2695                 if ((m->mdmreg[REG_SI1] & 1) && (i > VBUF))
2696                         PARSE_ERROR1;
2697 #endif
2698                 m->mdmreg[REG_PSIZE] = i / 16;
2699                 info->xmit_size = m->mdmreg[REG_PSIZE] * 16;
2700                 switch (m->mdmreg[REG_L2PROT]) {
2701                 case ISDN_PROTO_L2_V11096:
2702                 case ISDN_PROTO_L2_V11019:
2703                 case ISDN_PROTO_L2_V11038:
2704                         info->xmit_size /= 10;
2705                 }
2706                 break;
2707         case 'C':
2708                 /* &C - DCD Status */
2709                 p[0]++;
2710                 switch (isdn_getnum(p)) {
2711                 case 0:
2712                         m->mdmreg[REG_DCD] &= ~BIT_DCD;
2713                         break;
2714                 case 1:
2715                         m->mdmreg[REG_DCD] |= BIT_DCD;
2716                         break;
2717                 default:
2718                         PARSE_ERROR1
2719                                 }
2720                 break;
2721         case 'D':
2722                 /* &D - Set DTR-Low-behavior */
2723                 p[0]++;
2724                 switch (isdn_getnum(p)) {
2725                 case 0:
2726                         m->mdmreg[REG_DTRHUP] &= ~BIT_DTRHUP;
2727                         m->mdmreg[REG_DTRR] &= ~BIT_DTRR;
2728                         break;
2729                 case 2:
2730                         m->mdmreg[REG_DTRHUP] |= BIT_DTRHUP;
2731                         m->mdmreg[REG_DTRR] &= ~BIT_DTRR;
2732                         break;
2733                 case 3:
2734                         m->mdmreg[REG_DTRHUP] |= BIT_DTRHUP;
2735                         m->mdmreg[REG_DTRR] |= BIT_DTRR;
2736                         break;
2737                 default:
2738                         PARSE_ERROR1
2739                                 }
2740                 break;
2741         case 'E':
2742                 /* &E -Set EAZ/MSN */
2743                 p[0]++;
2744                 isdn_tty_get_msnstr(m->msn, p);
2745                 break;
2746         case 'F':
2747                 /* &F -Set Factory-Defaults */
2748                 p[0]++;
2749                 if (info->msr & UART_MSR_DCD)
2750                         PARSE_ERROR1;
2751                 isdn_tty_reset_profile(m);
2752                 isdn_tty_modem_reset_regs(info, 1);
2753                 break;
2754 #ifdef DUMMY_HAYES_AT
2755         case 'K':
2756                 /* only for be compilant with common scripts */
2757                 /* &K Flowcontrol - no function */
2758                 p[0]++;
2759                 isdn_getnum(p);
2760                 break;
2761 #endif
2762         case 'L':
2763                 /* &L -Set Numbers to listen on */
2764                 p[0]++;
2765                 i = 0;
2766                 while (*p[0] && (strchr("0123456789,-*[]?;", *p[0])) &&
2767                        (i < ISDN_LMSNLEN - 1))
2768                         m->lmsn[i++] = *p[0]++;
2769                 m->lmsn[i] = '\0';
2770                 break;
2771         case 'R':
2772                 /* &R - Set V.110 bitrate adaption */
2773                 p[0]++;
2774                 i = isdn_getnum(p);
2775                 switch (i) {
2776                 case 0:
2777                         /* Switch off V.110, back to X.75 */
2778                         m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
2779                         m->mdmreg[REG_SI2] = 0;
2780                         info->xmit_size = m->mdmreg[REG_PSIZE] * 16;
2781                         break;
2782                 case 9600:
2783                         m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_V11096;
2784                         m->mdmreg[REG_SI2] = 197;
2785                         info->xmit_size = m->mdmreg[REG_PSIZE] * 16 / 10;
2786                         break;
2787                 case 19200:
2788                         m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_V11019;
2789                         m->mdmreg[REG_SI2] = 199;
2790                         info->xmit_size = m->mdmreg[REG_PSIZE] * 16 / 10;
2791                         break;
2792                 case 38400:
2793                         m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_V11038;
2794                         m->mdmreg[REG_SI2] = 198; /* no existing standard for this */
2795                         info->xmit_size = m->mdmreg[REG_PSIZE] * 16 / 10;
2796                         break;
2797                 default:
2798                         PARSE_ERROR1;
2799                 }
2800                 /* Switch off T.70 */
2801                 m->mdmreg[REG_T70] &= ~(BIT_T70 | BIT_T70_EXT);
2802                 /* Set Service 7 */
2803                 m->mdmreg[REG_SI1] |= 4;
2804                 break;
2805         case 'S':
2806                 /* &S - Set Windowsize */
2807                 p[0]++;
2808                 i = isdn_getnum(p);
2809                 if ((i > 0) && (i < 9))
2810                         m->mdmreg[REG_WSIZE] = i;
2811                 else
2812                         PARSE_ERROR1;
2813                 break;
2814         case 'V':
2815                 /* &V - Show registers */
2816                 p[0]++;
2817                 isdn_tty_at_cout("\r\n", info);
2818                 for (i = 0; i < ISDN_MODEM_NUMREG; i++) {
2819                         sprintf(rb, "S%02d=%03d%s", i,
2820                                 m->mdmreg[i], ((i + 1) % 10) ? " " : "\r\n");
2821                         isdn_tty_at_cout(rb, info);
2822                 }
2823                 sprintf(rb, "\r\nEAZ/MSN: %.50s\r\n",
2824                         strlen(m->msn) ? m->msn : "None");
2825                 isdn_tty_at_cout(rb, info);
2826                 if (strlen(m->lmsn)) {
2827                         isdn_tty_at_cout("\r\nListen: ", info);
2828                         isdn_tty_at_cout(m->lmsn, info);
2829                         isdn_tty_at_cout("\r\n", info);
2830                 }
2831                 break;
2832         case 'W':
2833                 /* &W - Write Profile */
2834                 p[0]++;
2835                 switch (*p[0]) {
2836                 case '0':
2837                         p[0]++;
2838                         modem_write_profile(m);
2839                         break;
2840                 default:
2841                         PARSE_ERROR1;
2842                 }
2843                 break;
2844         case 'X':
2845                 /* &X - Switch to BTX-Mode and T.70 */
2846                 p[0]++;
2847                 switch (isdn_getnum(p)) {
2848                 case 0:
2849                         m->mdmreg[REG_T70] &= ~(BIT_T70 | BIT_T70_EXT);
2850                         info->xmit_size = m->mdmreg[REG_PSIZE] * 16;
2851                         break;
2852                 case 1:
2853                         m->mdmreg[REG_T70] |= BIT_T70;
2854                         m->mdmreg[REG_T70] &= ~BIT_T70_EXT;
2855                         m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
2856                         info->xmit_size = 112;
2857                         m->mdmreg[REG_SI1] = 4;
2858                         m->mdmreg[REG_SI2] = 0;
2859                         break;
2860                 case 2:
2861                         m->mdmreg[REG_T70] |= (BIT_T70 | BIT_T70_EXT);
2862                         m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
2863                         info->xmit_size = 112;
2864                         m->mdmreg[REG_SI1] = 4;
2865                         m->mdmreg[REG_SI2] = 0;
2866                         break;
2867                 default:
2868                         PARSE_ERROR1;
2869                 }
2870                 break;
2871         default:
2872                 PARSE_ERROR1;
2873         }
2874         return 0;
2875 }
2876
2877 static int
2878 isdn_tty_check_ats(int mreg, int mval, modem_info *info, atemu *m)
2879 {
2880         /* Some plausibility checks */
2881         switch (mreg) {
2882         case REG_L2PROT:
2883                 if (mval > ISDN_PROTO_L2_MAX)
2884                         return 1;
2885                 break;
2886         case REG_PSIZE:
2887                 if ((mval * 16) > ISDN_SERIAL_XMIT_MAX)
2888                         return 1;
2889 #ifdef CONFIG_ISDN_AUDIO
2890                 if ((m->mdmreg[REG_SI1] & 1) && (mval > VBUFX))
2891                         return 1;
2892 #endif
2893                 info->xmit_size = mval * 16;
2894                 switch (m->mdmreg[REG_L2PROT]) {
2895                 case ISDN_PROTO_L2_V11096:
2896                 case ISDN_PROTO_L2_V11019:
2897                 case ISDN_PROTO_L2_V11038:
2898                         info->xmit_size /= 10;
2899                 }
2900                 break;
2901         case REG_SI1I:
2902         case REG_PLAN:
2903         case REG_SCREEN:
2904                 /* readonly registers */
2905                 return 1;
2906         }
2907         return 0;
2908 }
2909
2910 /*
2911  * Perform ATS command
2912  */
2913 static int
2914 isdn_tty_cmd_ATS(char **p, modem_info *info)
2915 {
2916         atemu *m = &info->emu;
2917         int bitpos;
2918         int mreg;
2919         int mval;
2920         int bval;
2921
2922         mreg = isdn_getnum(p);
2923         if (mreg < 0 || mreg >= ISDN_MODEM_NUMREG)
2924                 PARSE_ERROR1;
2925         switch (*p[0]) {
2926         case '=':
2927                 p[0]++;
2928                 mval = isdn_getnum(p);
2929                 if (mval < 0 || mval > 255)
2930                         PARSE_ERROR1;
2931                 if (isdn_tty_check_ats(mreg, mval, info, m))
2932                         PARSE_ERROR1;
2933                 m->mdmreg[mreg] = mval;
2934                 break;
2935         case '.':
2936                 /* Set/Clear a single bit */
2937                 p[0]++;
2938                 bitpos = isdn_getnum(p);
2939                 if ((bitpos < 0) || (bitpos > 7))
2940                         PARSE_ERROR1;
2941                 switch (*p[0]) {
2942                 case '=':
2943                         p[0]++;
2944                         bval = isdn_getnum(p);
2945                         if (bval < 0 || bval > 1)
2946                                 PARSE_ERROR1;
2947                         if (bval)
2948                                 mval = m->mdmreg[mreg] | (1 << bitpos);
2949                         else
2950                                 mval = m->mdmreg[mreg] & ~(1 << bitpos);
2951                         if (isdn_tty_check_ats(mreg, mval, info, m))
2952                                 PARSE_ERROR1;
2953                         m->mdmreg[mreg] = mval;
2954                         break;
2955                 case '?':
2956                         p[0]++;
2957                         isdn_tty_at_cout("\r\n", info);
2958                         isdn_tty_at_cout((m->mdmreg[mreg] & (1 << bitpos)) ? "1" : "0",
2959                                          info);
2960                         break;
2961                 default:
2962                         PARSE_ERROR1;
2963                 }
2964                 break;
2965         case '?':
2966                 p[0]++;
2967                 isdn_tty_show_profile(mreg, info);
2968                 break;
2969         default:
2970                 PARSE_ERROR1;
2971                 break;
2972         }
2973         return 0;
2974 }
2975
2976 /*
2977  * Perform ATA command
2978  */
2979 static void
2980 isdn_tty_cmd_ATA(modem_info *info)
2981 {
2982         atemu *m = &info->emu;
2983         isdn_ctrl cmd;
2984         int l2;
2985
2986         if (info->msr & UART_MSR_RI) {
2987                 /* Accept incoming call */
2988                 info->last_dir = 0;
2989                 strcpy(info->last_num, dev->num[info->drv_index]);
2990                 m->mdmreg[REG_RINGCNT] = 0;
2991                 info->msr &= ~UART_MSR_RI;
2992                 l2 = m->mdmreg[REG_L2PROT];
2993 #ifdef CONFIG_ISDN_AUDIO
2994                 /* If more than one bit set in reg18, autoselect Layer2 */
2995                 if ((m->mdmreg[REG_SI1] & m->mdmreg[REG_SI1I]) != m->mdmreg[REG_SI1]) {
2996                         if (m->mdmreg[REG_SI1I] == 1) {
2997                                 if ((l2 != ISDN_PROTO_L2_MODEM) && (l2 != ISDN_PROTO_L2_FAX))
2998                                         l2 = ISDN_PROTO_L2_TRANS;
2999                         } else
3000                                 l2 = ISDN_PROTO_L2_X75I;
3001                 }
3002 #endif
3003                 cmd.driver = info->isdn_driver;
3004                 cmd.command = ISDN_CMD_SETL2;
3005                 cmd.arg = info->isdn_channel + (l2 << 8);
3006                 info->last_l2 = l2;
3007                 isdn_command(&cmd);
3008                 cmd.driver = info->isdn_driver;
3009                 cmd.command = ISDN_CMD_SETL3;
3010                 cmd.arg = info->isdn_channel + (m->mdmreg[REG_L3PROT] << 8);
3011 #ifdef CONFIG_ISDN_TTY_FAX
3012                 if (l2 == ISDN_PROTO_L2_FAX) {
3013                         cmd.parm.fax = info->fax;
3014                         info->fax->direction = ISDN_TTY_FAX_CONN_IN;
3015                 }
3016 #endif
3017                 isdn_command(&cmd);
3018                 cmd.driver = info->isdn_driver;
3019                 cmd.arg = info->isdn_channel;
3020                 cmd.command = ISDN_CMD_ACCEPTD;
3021                 info->dialing = 16;
3022                 info->emu.carrierwait = 0;
3023                 isdn_command(&cmd);
3024                 isdn_timer_ctrl(ISDN_TIMER_CARRIER, 1);
3025         } else
3026                 isdn_tty_modem_result(RESULT_NO_ANSWER, info);
3027 }
3028
3029 #ifdef CONFIG_ISDN_AUDIO
3030 /*
3031  * Parse AT+F.. commands
3032  */
3033 static int
3034 isdn_tty_cmd_PLUSF(char **p, modem_info *info)
3035 {
3036         atemu *m = &info->emu;
3037         char rs[20];
3038
3039         if (!strncmp(p[0], "CLASS", 5)) {
3040                 p[0] += 5;
3041                 switch (*p[0]) {
3042                 case '?':
3043                         p[0]++;
3044                         sprintf(rs, "\r\n%d",
3045                                 (m->mdmreg[REG_SI1] & 1) ? 8 : 0);
3046 #ifdef CONFIG_ISDN_TTY_FAX
3047                         if (TTY_IS_FCLASS2(info))
3048                                 sprintf(rs, "\r\n2");
3049                         else if (TTY_IS_FCLASS1(info))
3050                                 sprintf(rs, "\r\n1");
3051 #endif
3052                         isdn_tty_at_cout(rs, info);
3053                         break;
3054                 case '=':
3055                         p[0]++;
3056                         switch (*p[0]) {
3057                         case '0':
3058                                 p[0]++;
3059                                 m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
3060                                 m->mdmreg[REG_L3PROT] = ISDN_PROTO_L3_TRANS;
3061                                 m->mdmreg[REG_SI1] = 4;
3062                                 info->xmit_size =
3063                                         m->mdmreg[REG_PSIZE] * 16;
3064                                 break;
3065 #ifdef CONFIG_ISDN_TTY_FAX
3066                         case '1':
3067                                 p[0]++;
3068                                 if (!(dev->global_features &
3069                                       ISDN_FEATURE_L3_FCLASS1))
3070                                         PARSE_ERROR1;
3071                                 m->mdmreg[REG_SI1] = 1;
3072                                 m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_FAX;
3073                                 m->mdmreg[REG_L3PROT] = ISDN_PROTO_L3_FCLASS1;
3074                                 info->xmit_size =
3075                                         m->mdmreg[REG_PSIZE] * 16;
3076                                 break;
3077                         case '2':
3078                                 p[0]++;
3079                                 if (!(dev->global_features &
3080                                       ISDN_FEATURE_L3_FCLASS2))
3081                                         PARSE_ERROR1;
3082                                 m->mdmreg[REG_SI1] = 1;
3083                                 m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_FAX;
3084                                 m->mdmreg[REG_L3PROT] = ISDN_PROTO_L3_FCLASS2;
3085                                 info->xmit_size =
3086                                         m->mdmreg[REG_PSIZE] * 16;
3087                                 break;
3088 #endif
3089                         case '8':
3090                                 p[0]++;
3091                                 /* L2 will change on dialout with si=1 */
3092                                 m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
3093                                 m->mdmreg[REG_L3PROT] = ISDN_PROTO_L3_TRANS;
3094                                 m->mdmreg[REG_SI1] = 5;
3095                                 info->xmit_size = VBUF;
3096                                 break;
3097                         case '?':
3098                                 p[0]++;
3099                                 strcpy(rs, "\r\n0,");
3100 #ifdef CONFIG_ISDN_TTY_FAX
3101                                 if (dev->global_features &
3102                                     ISDN_FEATURE_L3_FCLASS1)
3103                                         strcat(rs, "1,");
3104                                 if (dev->global_features &
3105                                     ISDN_FEATURE_L3_FCLASS2)
3106                                         strcat(rs, "2,");
3107 #endif
3108                                 strcat(rs, "8");
3109                                 isdn_tty_at_cout(rs, info);
3110                                 break;
3111                         default:
3112                                 PARSE_ERROR1;
3113                         }
3114                         break;
3115                 default:
3116                         PARSE_ERROR1;
3117                 }
3118                 return 0;
3119         }
3120 #ifdef CONFIG_ISDN_TTY_FAX
3121         return (isdn_tty_cmd_PLUSF_FAX(p, info));
3122 #else
3123         PARSE_ERROR1;
3124 #endif
3125 }
3126
3127 /*
3128  * Parse AT+V.. commands
3129  */
3130 static int
3131 isdn_tty_cmd_PLUSV(char **p, modem_info *info)
3132 {
3133         atemu *m = &info->emu;
3134         isdn_ctrl cmd;
3135         static char *vcmd[] =
3136                 {"NH", "IP", "LS", "RX", "SD", "SM", "TX", "DD", NULL};
3137         int i;
3138         int par1;
3139         int par2;
3140         char rs[20];
3141
3142         i = 0;
3143         while (vcmd[i]) {
3144                 if (!strncmp(vcmd[i], p[0], 2)) {
3145                         p[0] += 2;
3146                         break;
3147                 }
3148                 i++;
3149         }
3150         switch (i) {
3151         case 0:
3152                 /* AT+VNH - Auto hangup feature */
3153                 switch (*p[0]) {
3154                 case '?':
3155                         p[0]++;
3156                         isdn_tty_at_cout("\r\n1", info);
3157                         break;
3158                 case '=':
3159                         p[0]++;
3160                         switch (*p[0]) {
3161                         case '1':
3162                                 p[0]++;
3163                                 break;
3164                         case '?':
3165                                 p[0]++;
3166                                 isdn_tty_at_cout("\r\n1", info);
3167                                 break;
3168                         default:
3169                                 PARSE_ERROR1;
3170                         }
3171                         break;
3172                 default:
3173                         PARSE_ERROR1;
3174                 }
3175                 break;
3176         case 1:
3177                 /* AT+VIP - Reset all voice parameters */
3178                 isdn_tty_modem_reset_vpar(m);
3179                 break;
3180         case 2:
3181                 /* AT+VLS - Select device, accept incoming call */
3182                 switch (*p[0]) {
3183                 case '?':
3184                         p[0]++;
3185                         sprintf(rs, "\r\n%d", m->vpar[0]);
3186                         isdn_tty_at_cout(rs, info);
3187                         break;
3188                 case '=':
3189                         p[0]++;
3190                         switch (*p[0]) {
3191                         case '0':
3192                                 p[0]++;
3193                                 m->vpar[0] = 0;
3194                                 break;
3195                         case '2':
3196                                 p[0]++;
3197                                 m->vpar[0] = 2;
3198                                 break;
3199                         case '?':
3200                                 p[0]++;
3201                                 isdn_tty_at_cout("\r\n0,2", info);
3202                                 break;
3203                         default:
3204                                 PARSE_ERROR1;
3205                         }
3206                         break;
3207                 default:
3208                         PARSE_ERROR1;
3209                 }
3210                 break;
3211         case 3:
3212                 /* AT+VRX - Start recording */
3213                 if (!m->vpar[0])
3214                         PARSE_ERROR1;
3215                 if (info->online != 1) {
3216                         isdn_tty_modem_result(RESULT_NO_ANSWER, info);
3217                         return 1;
3218                 }
3219                 info->dtmf_state = isdn_audio_dtmf_init(info->dtmf_state);
3220                 if (!info->dtmf_state) {
3221                         printk(KERN_WARNING "isdn_tty: Couldn't malloc dtmf state\n");
3222                         PARSE_ERROR1;
3223                 }
3224                 info->silence_state = isdn_audio_silence_init(info->silence_state);
3225                 if (!info->silence_state) {
3226                         printk(KERN_WARNING "isdn_tty: Couldn't malloc silence state\n");
3227                         PARSE_ERROR1;
3228                 }
3229                 if (m->vpar[3] < 5) {
3230                         info->adpcmr = isdn_audio_adpcm_init(info->adpcmr, m->vpar[3]);
3231                         if (!info->adpcmr) {
3232                                 printk(KERN_WARNING "isdn_tty: Couldn't malloc adpcm state\n");
3233                                 PARSE_ERROR1;
3234                         }
3235                 }
3236 #ifdef ISDN_DEBUG_AT
3237                 printk(KERN_DEBUG "AT: +VRX\n");
3238 #endif
3239                 info->vonline |= 1;
3240                 isdn_tty_modem_result(RESULT_CONNECT, info);
3241                 return 0;
3242                 break;
3243         case 4:
3244                 /* AT+VSD - Silence detection */
3245                 switch (*p[0]) {
3246                 case '?':
3247                         p[0]++;
3248                         sprintf(rs, "\r\n<%d>,<%d>",
3249                                 m->vpar[1],
3250                                 m->vpar[2]);
3251                         isdn_tty_at_cout(rs, info);
3252                         break;
3253                 case '=':
3254                         p[0]++;
3255                         if ((*p[0] >= '0') && (*p[0] <= '9')) {
3256                                 par1 = isdn_getnum(p);
3257                                 if ((par1 < 0) || (par1 > 31))
3258                                         PARSE_ERROR1;
3259                                 if (*p[0] != ',')
3260                                         PARSE_ERROR1;
3261                                 p[0]++;
3262                                 par2 = isdn_getnum(p);
3263                                 if ((par2 < 0) || (par2 > 255))
3264                                         PARSE_ERROR1;
3265                                 m->vpar[1] = par1;
3266                                 m->vpar[2] = par2;
3267                                 break;
3268                         } else
3269                                 if (*p[0] == '?') {
3270                                         p[0]++;
3271                                         isdn_tty_at_cout("\r\n<0-31>,<0-255>",
3272                                                          info);
3273                                         break;
3274                                 } else
3275                                         PARSE_ERROR1;
3276                         break;
3277                 default:
3278                         PARSE_ERROR1;
3279                 }
3280                 break;
3281         case 5:
3282                 /* AT+VSM - Select compression */
3283                 switch (*p[0]) {
3284                 case '?':
3285                         p[0]++;
3286                         sprintf(rs, "\r\n<%d>,<%d><8000>",
3287                                 m->vpar[3],
3288                                 m->vpar[1]);
3289                         isdn_tty_at_cout(rs, info);
3290                         break;
3291                 case '=':
3292                         p[0]++;
3293                         switch (*p[0]) {
3294                         case '2':
3295                         case '3':
3296                         case '4':
3297                         case '5':
3298                         case '6':
3299                                 par1 = isdn_getnum(p);
3300                                 if ((par1 < 2) || (par1 > 6))
3301                                         PARSE_ERROR1;
3302                                 m->vpar[3] = par1;
3303                                 break;
3304                         case '?':
3305                                 p[0]++;
3306                                 isdn_tty_at_cout("\r\n2;ADPCM;2;0;(8000)\r\n",
3307                                                  info);
3308                                 isdn_tty_at_cout("3;ADPCM;3;0;(8000)\r\n",
3309                                                  info);
3310                                 isdn_tty_at_cout("4;ADPCM;4;0;(8000)\r\n",
3311                                                  info);
3312                                 isdn_tty_at_cout("5;ALAW;8;0;(8000)\r\n",
3313                                                  info);
3314                                 isdn_tty_at_cout("6;ULAW;8;0;(8000)\r\n",
3315                                                  info);
3316                                 break;
3317                         default:
3318                                 PARSE_ERROR1;
3319                         }
3320                         break;
3321                 default:
3322                         PARSE_ERROR1;
3323                 }
3324                 break;
3325         case 6:
3326                 /* AT+VTX - Start sending */
3327                 if (!m->vpar[0])
3328                         PARSE_ERROR1;
3329                 if (info->online != 1) {
3330                         isdn_tty_modem_result(RESULT_NO_ANSWER, info);
3331                         return 1;
3332                 }
3333                 info->dtmf_state = isdn_audio_dtmf_init(info->dtmf_state);
3334                 if (!info->dtmf_state) {
3335                         printk(KERN_WARNING "isdn_tty: Couldn't malloc dtmf state\n");
3336                         PARSE_ERROR1;
3337                 }
3338                 if (m->vpar[3] < 5) {
3339                         info->adpcms = isdn_audio_adpcm_init(info->adpcms, m->vpar[3]);
3340                         if (!info->adpcms) {
3341                                 printk(KERN_WARNING "isdn_tty: Couldn't malloc adpcm state\n");
3342                                 PARSE_ERROR1;
3343                         }
3344                 }
3345 #ifdef ISDN_DEBUG_AT
3346                 printk(KERN_DEBUG "AT: +VTX\n");
3347 #endif
3348                 m->lastDLE = 0;
3349                 info->vonline |= 2;
3350                 isdn_tty_modem_result(RESULT_CONNECT, info);
3351                 return 0;
3352                 break;
3353         case 7:
3354                 /* AT+VDD - DTMF detection */
3355                 switch (*p[0]) {
3356                 case '?':
3357                         p[0]++;
3358                         sprintf(rs, "\r\n<%d>,<%d>",
3359                                 m->vpar[4],
3360                                 m->vpar[5]);
3361                         isdn_tty_at_cout(rs, info);
3362                         break;
3363                 case '=':
3364                         p[0]++;
3365                         if ((*p[0] >= '0') && (*p[0] <= '9')) {
3366                                 if (info->online != 1)
3367                                         PARSE_ERROR1;
3368                                 par1 = isdn_getnum(p);
3369                                 if ((par1 < 0) || (par1 > 15))
3370                                         PARSE_ERROR1;
3371                                 if (*p[0] != ',')
3372                                         PARSE_ERROR1;
3373                                 p[0]++;
3374                                 par2 = isdn_getnum(p);
3375                                 if ((par2 < 0) || (par2 > 255))
3376                                         PARSE_ERROR1;
3377                                 m->vpar[4] = par1;
3378                                 m->vpar[5] = par2;
3379                                 cmd.driver = info->isdn_driver;
3380                                 cmd.command = ISDN_CMD_AUDIO;
3381                                 cmd.arg = info->isdn_channel + (ISDN_AUDIO_SETDD << 8);
3382                                 cmd.parm.num[0] = par1;
3383                                 cmd.parm.num[1] = par2;
3384                                 isdn_command(&cmd);
3385                                 break;
3386                         } else
3387                                 if (*p[0] == '?') {
3388                                         p[0]++;
3389                                         isdn_tty_at_cout("\r\n<0-15>,<0-255>",
3390                                                          info);
3391                                         break;
3392                                 } else
3393                                         PARSE_ERROR1;
3394                         break;
3395                 default:
3396                         PARSE_ERROR1;
3397                 }
3398                 break;
3399         default:
3400                 PARSE_ERROR1;
3401         }
3402         return 0;
3403 }
3404 #endif                          /* CONFIG_ISDN_AUDIO */
3405
3406 /*
3407  * Parse and perform an AT-command-line.
3408  */
3409 static void
3410 isdn_tty_parse_at(modem_info *info)
3411 {
3412         atemu *m = &info->emu;
3413         char *p;
3414         char ds[ISDN_MSNLEN];
3415
3416 #ifdef ISDN_DEBUG_AT
3417         printk(KERN_DEBUG "AT: '%s'\n", m->mdmcmd);
3418 #endif
3419         for (p = &m->mdmcmd[2]; *p;) {
3420                 switch (*p) {
3421                 case ' ':
3422                         p++;
3423                         break;
3424                 case 'A':
3425                         /* A - Accept incoming call */
3426                         p++;
3427                         isdn_tty_cmd_ATA(info);
3428                         return;
3429                         break;
3430                 case 'D':
3431                         /* D - Dial */
3432                         if (info->msr & UART_MSR_DCD)
3433                                 PARSE_ERROR;
3434                         if (info->msr & UART_MSR_RI) {
3435                                 isdn_tty_modem_result(RESULT_NO_CARRIER, info);
3436                                 return;
3437                         }
3438                         isdn_tty_getdial(++p, ds, sizeof ds);
3439                         p += strlen(p);
3440                         if (!strlen(m->msn))
3441                                 isdn_tty_modem_result(RESULT_NO_MSN_EAZ, info);
3442                         else if (strlen(ds))
3443                                 isdn_tty_dial(ds, info, m);
3444                         else
3445                                 PARSE_ERROR;
3446                         return;
3447                 case 'E':
3448                         /* E - Turn Echo on/off */
3449                         p++;
3450                         switch (isdn_getnum(&p)) {
3451                         case 0:
3452                                 m->mdmreg[REG_ECHO] &= ~BIT_ECHO;
3453                                 break;
3454                         case 1:
3455                                 m->mdmreg[REG_ECHO] |= BIT_ECHO;
3456                                 break;
3457                         default:
3458                                 PARSE_ERROR;
3459                         }
3460                         break;
3461                 case 'H':
3462                         /* H - On/Off-hook */
3463                         p++;
3464                         switch (*p) {
3465                         case '0':
3466                                 p++;
3467                                 isdn_tty_on_hook(info);
3468                                 break;
3469                         case '1':
3470                                 p++;
3471                                 isdn_tty_off_hook();
3472                                 break;
3473                         default:
3474                                 isdn_tty_on_hook(info);
3475                                 break;
3476                         }
3477                         break;
3478                 case 'I':
3479                         /* I - Information */
3480                         p++;
3481                         isdn_tty_at_cout("\r\nLinux ISDN", info);
3482                         switch (*p) {
3483                         case '0':
3484                         case '1':
3485                                 p++;
3486                                 break;
3487                         case '2':
3488                                 p++;
3489                                 isdn_tty_report(info);
3490                                 break;
3491                         case '3':
3492                                 p++;
3493                                 snprintf(ds, sizeof(ds), "\r\n%d", info->emu.charge);
3494                                 isdn_tty_at_cout(ds, info);
3495                                 break;
3496                         default:;
3497                         }
3498                         break;
3499 #ifdef DUMMY_HAYES_AT
3500                 case 'L':
3501                 case 'M':
3502                         /* only for be compilant with common scripts */
3503                         /* no function */
3504                         p++;
3505                         isdn_getnum(&p);
3506                         break;
3507 #endif
3508                 case 'O':
3509                         /* O - Go online */
3510                         p++;
3511                         if (info->msr & UART_MSR_DCD)
3512                                 /* if B-Channel is up */
3513                                 isdn_tty_modem_result((m->mdmreg[REG_L2PROT] == ISDN_PROTO_L2_MODEM) ? RESULT_CONNECT : RESULT_CONNECT64000, info);
3514                         else
3515                                 isdn_tty_modem_result(RESULT_NO_CARRIER, info);
3516                         return;
3517                 case 'Q':
3518                         /* Q - Turn Emulator messages on/off */
3519                         p++;
3520                         switch (isdn_getnum(&p)) {
3521                         case 0:
3522                                 m->mdmreg[REG_RESP] |= BIT_RESP;
3523                                 break;
3524                         case 1:
3525                                 m->mdmreg[REG_RESP] &= ~BIT_RESP;
3526                                 break;
3527                         default:
3528                                 PARSE_ERROR;
3529                         }
3530                         break;
3531                 case 'S':
3532                         /* S - Set/Get Register */
3533                         p++;
3534                         if (isdn_tty_cmd_ATS(&p, info))
3535                                 return;
3536                         break;
3537                 case 'V':
3538                         /* V - Numeric or ASCII Emulator-messages */
3539                         p++;
3540                         switch (isdn_getnum(&p)) {
3541                         case 0:
3542                                 m->mdmreg[REG_RESP] |= BIT_RESPNUM;
3543                                 break;
3544                         case 1:
3545                                 m->mdmreg[REG_RESP] &= ~BIT_RESPNUM;
3546                                 break;
3547                         default:
3548                                 PARSE_ERROR;
3549                         }
3550                         break;
3551                 case 'Z':
3552                         /* Z - Load Registers from Profile */
3553                         p++;
3554                         if (info->msr & UART_MSR_DCD) {
3555                                 info->online = 0;
3556                                 isdn_tty_on_hook(info);
3557                         }
3558                         isdn_tty_modem_reset_regs(info, 1);
3559                         break;
3560                 case '+':
3561                         p++;
3562                         switch (*p) {
3563 #ifdef CONFIG_ISDN_AUDIO
3564                         case 'F':
3565                                 p++;
3566                                 if (isdn_tty_cmd_PLUSF(&p, info))
3567                                         return;
3568                                 break;
3569                         case 'V':
3570                                 if ((!(m->mdmreg[REG_SI1] & 1)) ||
3571                                     (m->mdmreg[REG_L2PROT] == ISDN_PROTO_L2_MODEM))
3572                                         PARSE_ERROR;
3573                                 p++;
3574                                 if (isdn_tty_cmd_PLUSV(&p, info))
3575                                         return;
3576                                 break;
3577 #endif                          /* CONFIG_ISDN_AUDIO */
3578                         case 'S':       /* SUSPEND */
3579                                 p++;
3580                                 isdn_tty_get_msnstr(ds, &p);
3581                                 isdn_tty_suspend(ds, info, m);
3582                                 break;
3583                         case 'R':       /* RESUME */
3584                                 p++;
3585                                 isdn_tty_get_msnstr(ds, &p);
3586                                 isdn_tty_resume(ds, info, m);
3587                                 break;
3588                         case 'M':       /* MESSAGE */
3589                                 p++;
3590                                 isdn_tty_send_msg(info, m, p);
3591                                 break;
3592                         default:
3593                                 PARSE_ERROR;
3594                         }
3595                         break;
3596                 case '&':
3597                         p++;
3598                         if (isdn_tty_cmd_ATand(&p, info))
3599                                 return;
3600                         break;
3601                 default:
3602                         PARSE_ERROR;
3603                 }
3604         }
3605 #ifdef CONFIG_ISDN_AUDIO
3606         if (!info->vonline)
3607 #endif
3608                 isdn_tty_modem_result(RESULT_OK, info);
3609 }
3610
3611 /* Need own toupper() because standard-toupper is not available
3612  * within modules.
3613  */
3614 #define my_toupper(c) (((c >= 'a') && (c <= 'z')) ? (c & 0xdf) : c)
3615
3616 /*
3617  * Perform line-editing of AT-commands
3618  *
3619  * Parameters:
3620  *   p        inputbuffer
3621  *   count    length of buffer
3622  *   channel  index to line (minor-device)
3623  */
3624 static int
3625 isdn_tty_edit_at(const char *p, int count, modem_info *info)
3626 {
3627         atemu *m = &info->emu;
3628         int total = 0;
3629         u_char c;
3630         char eb[2];
3631         int cnt;
3632
3633         for (cnt = count; cnt > 0; p++, cnt--) {
3634                 c = *p;
3635                 total++;
3636                 if (c == m->mdmreg[REG_CR] || c == m->mdmreg[REG_LF]) {
3637                         /* Separator (CR or LF) */
3638                         m->mdmcmd[m->mdmcmdl] = 0;
3639                         if (m->mdmreg[REG_ECHO] & BIT_ECHO) {
3640                                 eb[0] = c;
3641                                 eb[1] = 0;
3642                                 isdn_tty_at_cout(eb, info);
3643                         }
3644                         if ((m->mdmcmdl >= 2) && (!(strncmp(m->mdmcmd, "AT", 2))))
3645                                 isdn_tty_parse_at(info);
3646                         m->mdmcmdl = 0;
3647                         continue;
3648                 }
3649                 if (c == m->mdmreg[REG_BS] && m->mdmreg[REG_BS] < 128) {
3650                         /* Backspace-Function */
3651                         if ((m->mdmcmdl > 2) || (!m->mdmcmdl)) {
3652                                 if (m->mdmcmdl)
3653                                         m->mdmcmdl--;
3654                                 if (m->mdmreg[REG_ECHO] & BIT_ECHO)
3655                                         isdn_tty_at_cout("\b", info);
3656                         }
3657                         continue;
3658                 }
3659                 if (cmdchar(c)) {
3660                         if (m->mdmreg[REG_ECHO] & BIT_ECHO) {
3661                                 eb[0] = c;
3662                                 eb[1] = 0;
3663                                 isdn_tty_at_cout(eb, info);
3664                         }
3665                         if (m->mdmcmdl < 255) {
3666                                 c = my_toupper(c);
3667                                 switch (m->mdmcmdl) {
3668                                 case 1:
3669                                         if (c == 'T') {
3670                                                 m->mdmcmd[m->mdmcmdl] = c;
3671                                                 m->mdmcmd[++m->mdmcmdl] = 0;
3672                                                 break;
3673                                         } else
3674                                                 m->mdmcmdl = 0;
3675                                         /* Fall through, check for 'A' */
3676                                 case 0:
3677                                         if (c == 'A') {
3678                                                 m->mdmcmd[m->mdmcmdl] = c;
3679                                                 m->mdmcmd[++m->mdmcmdl] = 0;
3680                                         }
3681                                         break;
3682                                 default:
3683                                         m->mdmcmd[m->mdmcmdl] = c;
3684                                         m->mdmcmd[++m->mdmcmdl] = 0;
3685                                 }
3686                         }
3687                 }
3688         }
3689         return total;
3690 }
3691
3692 /*
3693  * Switch all modem-channels who are online and got a valid
3694  * escape-sequence 1.5 seconds ago, to command-mode.
3695  * This function is called every second via timer-interrupt from within
3696  * timer-dispatcher isdn_timer_function()
3697  */
3698 void
3699 isdn_tty_modem_escape(void)
3700 {
3701         int ton = 0;
3702         int i;
3703         int midx;
3704
3705         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
3706                 if (USG_MODEM(dev->usage[i]) && (midx = dev->m_idx[i]) >= 0) {
3707                         modem_info *info = &dev->mdm.info[midx];
3708                         if (info->online) {
3709                                 ton = 1;
3710                                 if ((info->emu.pluscount == 3) &&
3711                                     time_after(jiffies,
3712                                             info->emu.lastplus + PLUSWAIT2)) {
3713                                         info->emu.pluscount = 0;
3714                                         info->online = 0;
3715                                         isdn_tty_modem_result(RESULT_OK, info);
3716                                 }
3717                         }
3718                 }
3719         isdn_timer_ctrl(ISDN_TIMER_MODEMPLUS, ton);
3720 }
3721
3722 /*
3723  * Put a RING-message to all modem-channels who have the RI-bit set.
3724  * This function is called every second via timer-interrupt from within
3725  * timer-dispatcher isdn_timer_function()
3726  */
3727 void
3728 isdn_tty_modem_ring(void)
3729 {
3730         int ton = 0;
3731         int i;
3732
3733         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
3734                 modem_info *info = &dev->mdm.info[i];
3735                 if (info->msr & UART_MSR_RI) {
3736                         ton = 1;
3737                         isdn_tty_modem_result(RESULT_RING, info);
3738                 }
3739         }
3740         isdn_timer_ctrl(ISDN_TIMER_MODEMRING, ton);
3741 }
3742
3743 /*
3744  * For all online tty's, try sending data to
3745  * the lower levels.
3746  */
3747 void
3748 isdn_tty_modem_xmit(void)
3749 {
3750         int ton = 1;
3751         int i;
3752
3753         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
3754                 modem_info *info = &dev->mdm.info[i];
3755                 if (info->online) {
3756                         ton = 1;
3757                         isdn_tty_senddown(info);
3758                         isdn_tty_tint(info);
3759                 }
3760         }
3761         isdn_timer_ctrl(ISDN_TIMER_MODEMXMIT, ton);
3762 }
3763
3764 /*
3765  * Check all channels if we have a 'no carrier' timeout.
3766  * Timeout value is set by Register S7.
3767  */
3768 void
3769 isdn_tty_carrier_timeout(void)
3770 {
3771         int ton = 0;
3772         int i;
3773
3774         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
3775                 modem_info *info = &dev->mdm.info[i];
3776                 if (!info->dialing)
3777                         continue;
3778                 if (info->emu.carrierwait++ > info->emu.mdmreg[REG_WAITC]) {
3779                         info->dialing = 0;
3780                         isdn_tty_modem_result(RESULT_NO_CARRIER, info);
3781                         isdn_tty_modem_hup(info, 1);
3782                 } else
3783                         ton = 1;
3784         }
3785         isdn_timer_ctrl(ISDN_TIMER_CARRIER, ton);
3786 }