drivers/isdn/i4l/isdn_tty.c

   1 /* $Id: isdn_tty.c,v 1.1.2.3 2004/02/10 01:07:13 keil Exp $
   2  *
   3  * Linux ISDN subsystem, tty functions and AT-command emulator (linklevel).
   4  *
   5  * Copyright 1994-1999  by Fritz Elfert (fritz@isdn4linux.de)
   6  * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg
   7  *
   8  * This software may be used and distributed according to the terms
   9  * of the GNU General Public License, incorporated herein by reference.
  10  *
  11  */
  12 #undef ISDN_TTY_STAT_DEBUG
  13
  14 #include <linux/config.h>
  15 #include <linux/isdn.h>
  16 #include <linux/delay.h>
  17 #include "isdn_common.h"
  18 #include "isdn_tty.h"
  19 #ifdef CONFIG_ISDN_AUDIO
  20 #include "isdn_audio.h"
  21 #define VBUF 0x3e0
  22 #define VBUFX (VBUF/16)
  23 #endif
  24
  25 #define FIX_FILE_TRANSFER
  26 #define DUMMY_HAYES_AT
  27
  28 /* Prototypes */
  29
  30 static int isdn_tty_edit_at(const char *, int, modem_info *);
  31 static void isdn_tty_check_esc(const u_char *, u_char, int, int *, u_long *);
  32 static void isdn_tty_modem_reset_regs(modem_info *, int);
  33 static void isdn_tty_cmd_ATA(modem_info *);
  34 static void isdn_tty_flush_buffer(struct tty_struct *);
  35 static void isdn_tty_modem_result(int, modem_info *);
  36 #ifdef CONFIG_ISDN_AUDIO
  37 static int isdn_tty_countDLE(unsigned char *, int);
  38 #endif
  39
  40 /* Leave this unchanged unless you know what you do! */
  41 #define MODEM_PARANOIA_CHECK
  42 #define MODEM_DO_RESTART
  43
  44 static int bit2si[8] =
  45 {1, 5, 7, 7, 7, 7, 7, 7};
  46 static int si2bit[8] =
  47 {4, 1, 4, 4, 4, 4, 4, 4};
  48
  49 char *isdn_tty_revision = "$Revision: 1.1.2.3 $";
  50
  51
  52 /* isdn_tty_try_read() is called from within isdn_tty_rcv_skb()
  53  * to stuff incoming data directly into a tty's flip-buffer. This
  54  * is done to speed up tty-receiving if the receive-queue is empty.
  55  * This routine MUST be called with interrupts off.
  56  * Return:
  57  *  1 = Success
  58  *  0 = Failure, data has to be buffered and later processed by
  59  *      isdn_tty_readmodem().
  60  */
  61 static int
  62 isdn_tty_try_read(modem_info * info, struct sk_buff *skb)
  63 {
  64         int c;
  65         int len;
  66         struct tty_struct *tty;
  67         char last;
  68
  69         if (info->online) {
  70                 if ((tty = info->tty)) {
  71                         if (info->mcr & UART_MCR_RTS) {
  72                                 len = skb->len
  73 #ifdef CONFIG_ISDN_AUDIO
  74                                         + ISDN_AUDIO_SKB_DLECOUNT(skb)
  75 #endif
  76                                         ;
  77
  78                                 c = tty_buffer_request_room(tty, len);
  79                                 if (c >= len) {
  80 #ifdef CONFIG_ISDN_AUDIO
  81                                         if (ISDN_AUDIO_SKB_DLECOUNT(skb)) {
  82                                                 int l = skb->len;
  83                                                 unsigned char *dp = skb->data;
  84                                                 while (--l) {
  85                                                         if (*skb->data == DLE)
  86                                                                 tty_insert_flip_char(tty, DLE, 0);
  87                                                         tty_insert_flip_char(tty, *dp++, 0);
  88                                                 }
  89                                                 last = *dp;
  90                                         } else {
  91 #endif
  92                                                 if(len > 1)
  93                                                         tty_insert_flip_string(tty, skb->data, len - 1);
  94                                                 last = skb->data[len - 1];
  95 #ifdef CONFIG_ISDN_AUDIO
  96                                         }
  97 #endif
  98                                         if (info->emu.mdmreg[REG_CPPP] & BIT_CPPP)
  99                                                 tty_insert_flip_char(tty, last, 0xFF);
 100                                         else
 101                                                 tty_insert_flip_char(tty, last, TTY_NORMAL);
 102                                         tty_flip_buffer_push(tty);
 103                                         kfree_skb(skb);
 104                                         return 1;
 105                                 }
 106                         }
 107                 }
 108         }
 109         return 0;
 110 }
 111
 112 /* isdn_tty_readmodem() is called periodically from within timer-interrupt.
 113  * It tries getting received data from the receive queue an stuff it into
 114  * the tty's flip-buffer.
 115  */
 116 void
 117 isdn_tty_readmodem(void)
 118 {
 119         int resched = 0;
 120         int midx;
 121         int i;
 122         int r;
 123         struct tty_struct *tty;
 124         modem_info *info;
 125
 126         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
 127                 if ((midx = dev->m_idx[i]) >= 0) {
 128                         info = &dev->mdm.info[midx];
 129                         if (info->online) {
 130                                 r = 0;
 131 #ifdef CONFIG_ISDN_AUDIO
 132                                 isdn_audio_eval_dtmf(info);
 133                                 if ((info->vonline & 1) && (info->emu.vpar[1]))
 134                                         isdn_audio_eval_silence(info);
 135 #endif
 136                                 if ((tty = info->tty)) {
 137                                         if (info->mcr & UART_MCR_RTS) {
 138                                                 /* CISCO AsyncPPP Hack */
 139                                                 if (!(info->emu.mdmreg[REG_CPPP] & BIT_CPPP))
 140                                                         r = isdn_readbchan_tty(info->isdn_driver, info->isdn_channel, tty, 0);
 141                                                 else
 142                                                         r = isdn_readbchan_tty(info->isdn_driver, info->isdn_channel, tty, 1);
 143                                                 if (r)
 144                                                         tty_flip_buffer_push(tty);
 145                                         } else
 146                                                 r = 1;
 147                                 } else
 148                                         r = 1;
 149                                 if (r) {
 150                                         info->rcvsched = 0;
 151                                         resched = 1;
 152                                 } else
 153                                         info->rcvsched = 1;
 154                         }
 155                 }
 156         }
 157         if (!resched)
 158                 isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 0);
 159 }
 160
 161 int
 162 isdn_tty_rcv_skb(int i, int di, int channel, struct sk_buff *skb)
 163 {
 164         ulong flags;
 165         int midx;
 166 #ifdef CONFIG_ISDN_AUDIO
 167         int ifmt;
 168 #endif
 169         modem_info *info;
 170
 171         if ((midx = dev->m_idx[i]) < 0) {
 172                 /* if midx is invalid, packet is not for tty */
 173                 return 0;
 174         }
 175         info = &dev->mdm.info[midx];
 176 #ifdef CONFIG_ISDN_AUDIO
 177         ifmt = 1;
 178
 179         if ((info->vonline) && (!info->emu.vpar[4]))
 180                 isdn_audio_calc_dtmf(info, skb->data, skb->len, ifmt);
 181         if ((info->vonline & 1) && (info->emu.vpar[1]))
 182                 isdn_audio_calc_silence(info, skb->data, skb->len, ifmt);
 183 #endif
 184         if ((info->online < 2)
 185 #ifdef CONFIG_ISDN_AUDIO
 186             && (!(info->vonline & 1))
 187 #endif
 188                 ) {
 189                 /* If Modem not listening, drop data */
 190                 kfree_skb(skb);
 191                 return 1;
 192         }
 193         if (info->emu.mdmreg[REG_T70] & BIT_T70) {
 194                 if (info->emu.mdmreg[REG_T70] & BIT_T70_EXT) {
 195                         /* T.70 decoding: throw away the T.70 header (2 or 4 bytes)   */
 196                         if (skb->data[0] == 3) /* pure data packet -> 4 byte headers  */
 197                                 skb_pull(skb, 4);
 198                         else
 199                                 if (skb->data[0] == 1) /* keepalive packet -> 2 byte hdr  */
 200                                         skb_pull(skb, 2);
 201                 } else
 202                         /* T.70 decoding: Simply throw away the T.70 header (4 bytes) */
 203                         if ((skb->data[0] == 1) && ((skb->data[1] == 0) || (skb->data[1] == 1)))
 204                                 skb_pull(skb, 4);
 205         }
 206 #ifdef CONFIG_ISDN_AUDIO
 207         ISDN_AUDIO_SKB_DLECOUNT(skb) = 0;
 208         ISDN_AUDIO_SKB_LOCK(skb) = 0;
 209         if (info->vonline & 1) {
 210                 /* voice conversion/compression */
 211                 switch (info->emu.vpar[3]) {
 212                         case 2:
 213                         case 3:
 214                         case 4:
 215                                 /* adpcm
 216                                  * Since compressed data takes less
 217                                  * space, we can overwrite the buffer.
 218                                  */
 219                                 skb_trim(skb, isdn_audio_xlaw2adpcm(info->adpcmr,
 220                                                                     ifmt,
 221                                                                     skb->data,
 222                                                                     skb->data,
 223                                                                     skb->len));
 224                                 break;
 225                         case 5:
 226                                 /* a-law */
 227                                 if (!ifmt)
 228                                         isdn_audio_ulaw2alaw(skb->data, skb->len);
 229                                 break;
 230                         case 6:
 231                                 /* u-law */
 232                                 if (ifmt)
 233                                         isdn_audio_alaw2ulaw(skb->data, skb->len);
 234                                 break;
 235                 }
 236                 ISDN_AUDIO_SKB_DLECOUNT(skb) =
 237                         isdn_tty_countDLE(skb->data, skb->len);
 238         }
 239 #ifdef CONFIG_ISDN_TTY_FAX
 240         else {
 241                 if (info->faxonline & 2) {
 242                         isdn_tty_fax_bitorder(info, skb);
 243                         ISDN_AUDIO_SKB_DLECOUNT(skb) =
 244                                 isdn_tty_countDLE(skb->data, skb->len);
 245                 }
 246         }
 247 #endif
 248 #endif
 249         /* Try to deliver directly via tty-buf if queue is empty */
 250         spin_lock_irqsave(&info->readlock, flags);
 251         if (skb_queue_empty(&dev->drv[di]->rpqueue[channel]))
 252                 if (isdn_tty_try_read(info, skb)) {
 253                         spin_unlock_irqrestore(&info->readlock, flags);
 254                         return 1;
 255                 }
 256         /* Direct deliver failed or queue wasn't empty.
 257          * Queue up for later dequeueing via timer-irq.
 258          */
 259         __skb_queue_tail(&dev->drv[di]->rpqueue[channel], skb);
 260         dev->drv[di]->rcvcount[channel] +=
 261                 (skb->len
 262 #ifdef CONFIG_ISDN_AUDIO
 263                  + ISDN_AUDIO_SKB_DLECOUNT(skb)
 264 #endif
 265                         );
 266         spin_unlock_irqrestore(&info->readlock, flags);
 267         /* Schedule dequeuing */
 268         if ((dev->modempoll) && (info->rcvsched))
 269                 isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 1);
 270         return 1;
 271 }
 272
 273 static void
 274 isdn_tty_cleanup_xmit(modem_info * info)
 275 {
 276         skb_queue_purge(&info->xmit_queue);
 277 #ifdef CONFIG_ISDN_AUDIO
 278         skb_queue_purge(&info->dtmf_queue);
 279 #endif
 280 }
 281
 282 static void
 283 isdn_tty_tint(modem_info * info)
 284 {
 285         struct sk_buff *skb = skb_dequeue(&info->xmit_queue);
 286         int len, slen;
 287
 288         if (!skb)
 289                 return;
 290         len = skb->len;
 291         if ((slen = isdn_writebuf_skb_stub(info->isdn_driver,
 292                                            info->isdn_channel, 1, skb)) == len) {
 293                 struct tty_struct *tty = info->tty;
 294                 info->send_outstanding++;
 295                 info->msr &= ~UART_MSR_CTS;
 296                 info->lsr &= ~UART_LSR_TEMT;
 297                 tty_wakeup(tty);
 298                 return;
 299         }
 300         if (slen < 0) {
 301                 /* Error: no channel, already shutdown, or wrong parameter */
 302                 dev_kfree_skb(skb);
 303                 return;
 304         }
 305         skb_queue_head(&info->xmit_queue, skb);
 306 }
 307
 308 #ifdef CONFIG_ISDN_AUDIO
 309 static int
 310 isdn_tty_countDLE(unsigned char *buf, int len)
 311 {
 312         int count = 0;
 313
 314         while (len--)
 315                 if (*buf++ == DLE)
 316                         count++;
 317         return count;
 318 }
 319
 320 /* This routine is called from within isdn_tty_write() to perform
 321  * DLE-decoding when sending audio-data.
 322  */
 323 static int
 324 isdn_tty_handleDLEdown(modem_info * info, atemu * m, int len)
 325 {
 326         unsigned char *p = &info->xmit_buf[info->xmit_count];
 327         int count = 0;
 328
 329         while (len > 0) {
 330                 if (m->lastDLE) {
 331                         m->lastDLE = 0;
 332                         switch (*p) {
 333                                 case DLE:
 334                                         /* Escape code */
 335                                         if (len > 1)
 336                                                 memmove(p, p + 1, len - 1);
 337                                         p--;
 338                                         count++;
 339                                         break;
 340                                 case ETX:
 341                                         /* End of data */
 342                                         info->vonline |= 4;
 343                                         return count;
 344                                 case DC4:
 345                                         /* Abort RX */
 346                                         info->vonline &= ~1;
 347 #ifdef ISDN_DEBUG_MODEM_VOICE
 348                                         printk(KERN_DEBUG
 349                                                "DLEdown: got DLE-DC4, send DLE-ETX on ttyI%d\n",
 350                                                info->line);
 351 #endif
 352                                         isdn_tty_at_cout("\020\003", info);
 353                                         if (!info->vonline) {
 354 #ifdef ISDN_DEBUG_MODEM_VOICE
 355                                                 printk(KERN_DEBUG
 356                                                        "DLEdown: send VCON on ttyI%d\n",
 357                                                        info->line);
 358 #endif
 359                                                 isdn_tty_at_cout("\r\nVCON\r\n", info);
 360                                         }
 361                                         /* Fall through */
 362                                 case 'q':
 363                                 case 's':
 364                                         /* Silence */
 365                                         if (len > 1)
 366                                                 memmove(p, p + 1, len - 1);
 367                                         p--;
 368                                         break;
 369                         }
 370                 } else {
 371                         if (*p == DLE)
 372                                 m->lastDLE = 1;
 373                         else
 374                                 count++;
 375                 }
 376                 p++;
 377                 len--;
 378         }
 379         if (len < 0) {
 380                 printk(KERN_WARNING "isdn_tty: len<0 in DLEdown\n");
 381                 return 0;
 382         }
 383         return count;
 384 }
 385
 386 /* This routine is called from within isdn_tty_write() when receiving
 387  * audio-data. It interrupts receiving, if an character other than
 388  * ^S or ^Q is sent.
 389  */
 390 static int
 391 isdn_tty_end_vrx(const char *buf, int c)
 392 {
 393         char ch;
 394
 395         while (c--) {
 396                 ch = *buf;
 397                 if ((ch != 0x11) && (ch != 0x13))
 398                         return 1;
 399                 buf++;
 400         }
 401         return 0;
 402 }
 403
 404 static int voice_cf[7] =
 405 {0, 0, 4, 3, 2, 0, 0};
 406
 407 #endif                          /* CONFIG_ISDN_AUDIO */
 408
 409 /* isdn_tty_senddown() is called either directly from within isdn_tty_write()
 410  * or via timer-interrupt from within isdn_tty_modem_xmit(). It pulls
 411  * outgoing data from the tty's xmit-buffer, handles voice-decompression or
 412  * T.70 if necessary, and finally queues it up for sending via isdn_tty_tint.
 413  */
 414 static void
 415 isdn_tty_senddown(modem_info * info)
 416 {
 417         int buflen;
 418         int skb_res;
 419 #ifdef CONFIG_ISDN_AUDIO
 420         int audio_len;
 421 #endif
 422         struct sk_buff *skb;
 423
 424 #ifdef CONFIG_ISDN_AUDIO
 425         if (info->vonline & 4) {
 426                 info->vonline &= ~6;
 427                 if (!info->vonline) {
 428 #ifdef ISDN_DEBUG_MODEM_VOICE
 429                         printk(KERN_DEBUG
 430                                "senddown: send VCON on ttyI%d\n",
 431                                info->line);
 432 #endif
 433                         isdn_tty_at_cout("\r\nVCON\r\n", info);
 434                 }
 435         }
 436 #endif
 437         if (!(buflen = info->xmit_count))
 438                 return;
 439         if ((info->emu.mdmreg[REG_CTS] & BIT_CTS) != 0)
 440                 info->msr &= ~UART_MSR_CTS;
 441         info->lsr &= ~UART_LSR_TEMT;
 442         /* info->xmit_count is modified here and in isdn_tty_write().
 443          * So we return here if isdn_tty_write() is in the
 444          * critical section.
 445          */
 446         atomic_inc(&info->xmit_lock);
 447         if (!(atomic_dec_and_test(&info->xmit_lock)))
 448                 return;
 449         if (info->isdn_driver < 0) {
 450                 info->xmit_count = 0;
 451                 return;
 452         }
 453         skb_res = dev->drv[info->isdn_driver]->interface->hl_hdrlen + 4;
 454 #ifdef CONFIG_ISDN_AUDIO
 455         if (info->vonline & 2)
 456                 audio_len = buflen * voice_cf[info->emu.vpar[3]];
 457         else
 458                 audio_len = 0;
 459         skb = dev_alloc_skb(skb_res + buflen + audio_len);
 460 #else
 461         skb = dev_alloc_skb(skb_res + buflen);
 462 #endif
 463         if (!skb) {
 464                 printk(KERN_WARNING
 465                        "isdn_tty: Out of memory in ttyI%d senddown\n",
 466                        info->line);
 467                 return;
 468         }
 469         skb_reserve(skb, skb_res);
 470         memcpy(skb_put(skb, buflen), info->xmit_buf, buflen);
 471         info->xmit_count = 0;
 472 #ifdef CONFIG_ISDN_AUDIO
 473         if (info->vonline & 2) {
 474                 /* For now, ifmt is fixed to 1 (alaw), since this
 475                  * is used with ISDN everywhere in the world, except
 476                  * US, Canada and Japan.
 477                  * Later, when US-ISDN protocols are implemented,
 478                  * this setting will depend on the D-channel protocol.
 479                  */
 480                 int ifmt = 1;
 481
 482                 /* voice conversion/decompression */
 483                 switch (info->emu.vpar[3]) {
 484                         case 2:
 485                         case 3:
 486                         case 4:
 487                                 /* adpcm, compatible to ZyXel 1496 modem
 488                                  * with ROM revision 6.01
 489                                  */
 490                                 audio_len = isdn_audio_adpcm2xlaw(info->adpcms,
 491                                                                   ifmt,
 492                                                                   skb->data,
 493                                                     skb_put(skb, audio_len),
 494                                                                   buflen);
 495                                 skb_pull(skb, buflen);
 496                                 skb_trim(skb, audio_len);
 497                                 break;
 498                         case 5:
 499                                 /* a-law */
 500                                 if (!ifmt)
 501                                         isdn_audio_alaw2ulaw(skb->data,
 502                                                              buflen);
 503                                 break;
 504                         case 6:
 505                                 /* u-law */
 506                                 if (ifmt)
 507                                         isdn_audio_ulaw2alaw(skb->data,
 508                                                              buflen);
 509                                 break;
 510                 }
 511         }
 512 #endif                          /* CONFIG_ISDN_AUDIO */
 513         if (info->emu.mdmreg[REG_T70] & BIT_T70) {
 514                 /* Add T.70 simplified header */
 515                 if (info->emu.mdmreg[REG_T70] & BIT_T70_EXT)
 516                         memcpy(skb_push(skb, 2), "\1\0", 2);
 517                 else
 518                         memcpy(skb_push(skb, 4), "\1\0\1\0", 4);
 519         }
 520         skb_queue_tail(&info->xmit_queue, skb);
 521 }
 522
 523 /************************************************************
 524  *
 525  * Modem-functions
 526  *
 527  * mostly "stolen" from original Linux-serial.c and friends.
 528  *
 529  ************************************************************/
 530
 531 /* The next routine is called once from within timer-interrupt
 532  * triggered within isdn_tty_modem_ncarrier(). It calls
 533  * isdn_tty_modem_result() to stuff a "NO CARRIER" Message
 534  * into the tty's buffer.
 535  */
 536 static void
 537 isdn_tty_modem_do_ncarrier(unsigned long data)
 538 {
 539         modem_info *info = (modem_info *) data;
 540         isdn_tty_modem_result(RESULT_NO_CARRIER, info);
 541 }
 542
 543 /* Next routine is called, whenever the DTR-signal is raised.
 544  * It checks the ncarrier-flag, and triggers the above routine
 545  * when necessary. The ncarrier-flag is set, whenever DTR goes
 546  * low.
 547  */
 548 static void
 549 isdn_tty_modem_ncarrier(modem_info * info)
 550 {
 551         if (info->ncarrier) {
 552                 info->nc_timer.expires = jiffies + HZ;
 553                 add_timer(&info->nc_timer);
 554         }
 555 }
 556
 557 /*
 558  * return the usage calculated by si and layer 2 protocol
 559  */
 560 static int
 561 isdn_calc_usage(int si, int l2)
 562 {
 563         int usg = ISDN_USAGE_MODEM;
 564
 565 #ifdef CONFIG_ISDN_AUDIO
 566         if (si == 1) {
 567                 switch(l2) {
 568                         case ISDN_PROTO_L2_MODEM:
 569                                 usg = ISDN_USAGE_MODEM;
 570                                 break;
 571 #ifdef CONFIG_ISDN_TTY_FAX
 572                         case ISDN_PROTO_L2_FAX:
 573                                 usg = ISDN_USAGE_FAX;
 574                                 break;
 575 #endif
 576                         case ISDN_PROTO_L2_TRANS:
 577                         default:
 578                                 usg = ISDN_USAGE_VOICE;
 579                                 break;
 580                 }
 581         }
 582 #endif
 583         return(usg);
 584 }
 585
 586 /* isdn_tty_dial() performs dialing of a tty an the necessary
 587  * setup of the lower levels before that.
 588  */
 589 static void
 590 isdn_tty_dial(char *n, modem_info * info, atemu * m)
 591 {
 592         int usg = ISDN_USAGE_MODEM;
 593         int si = 7;
 594         int l2 = m->mdmreg[REG_L2PROT];
 595         u_long flags;
 596         isdn_ctrl cmd;
 597         int i;
 598         int j;
 599
 600         for (j = 7; j >= 0; j--)
 601                 if (m->mdmreg[REG_SI1] & (1 << j)) {
 602                         si = bit2si[j];
 603                         break;
 604                 }
 605         usg = isdn_calc_usage(si, l2);
 606 #ifdef CONFIG_ISDN_AUDIO
 607         if ((si == 1) &&
 608                 (l2 != ISDN_PROTO_L2_MODEM)
 609 #ifdef CONFIG_ISDN_TTY_FAX
 610                 && (l2 != ISDN_PROTO_L2_FAX)
 611 #endif
 612                 ) {
 613                 l2 = ISDN_PROTO_L2_TRANS;
 614                 usg = ISDN_USAGE_VOICE;
 615         }
 616 #endif
 617         m->mdmreg[REG_SI1I] = si2bit[si];
 618         spin_lock_irqsave(&dev->lock, flags);
 619         i = isdn_get_free_channel(usg, l2, m->mdmreg[REG_L3PROT], -1, -1, m->msn);
 620         if (i < 0) {
 621                 spin_unlock_irqrestore(&dev->lock, flags);
 622                 isdn_tty_modem_result(RESULT_NO_DIALTONE, info);
 623         } else {
 624                 info->isdn_driver = dev->drvmap[i];
 625                 info->isdn_channel = dev->chanmap[i];
 626                 info->drv_index = i;
 627                 dev->m_idx[i] = info->line;
 628                 dev->usage[i] |= ISDN_USAGE_OUTGOING;
 629                 info->last_dir = 1;
 630                 strcpy(info->last_num, n);
 631                 isdn_info_update();
 632                 spin_unlock_irqrestore(&dev->lock, flags);
 633                 cmd.driver = info->isdn_driver;
 634                 cmd.arg = info->isdn_channel;
 635                 cmd.command = ISDN_CMD_CLREAZ;
 636                 isdn_command(&cmd);
 637                 strcpy(cmd.parm.num, isdn_map_eaz2msn(m->msn, info->isdn_driver));
 638                 cmd.driver = info->isdn_driver;
 639                 cmd.command = ISDN_CMD_SETEAZ;
 640                 isdn_command(&cmd);
 641                 cmd.driver = info->isdn_driver;
 642                 cmd.command = ISDN_CMD_SETL2;
 643                 info->last_l2 = l2;
 644                 cmd.arg = info->isdn_channel + (l2 << 8);
 645                 isdn_command(&cmd);
 646                 cmd.driver = info->isdn_driver;
 647                 cmd.command = ISDN_CMD_SETL3;
 648                 cmd.arg = info->isdn_channel + (m->mdmreg[REG_L3PROT] << 8);
 649 #ifdef CONFIG_ISDN_TTY_FAX
 650                 if (l2 == ISDN_PROTO_L2_FAX) {
 651                         cmd.parm.fax = info->fax;
 652                         info->fax->direction = ISDN_TTY_FAX_CONN_OUT;
 653                 }
 654 #endif
 655                 isdn_command(&cmd);
 656                 cmd.driver = info->isdn_driver;
 657                 cmd.arg = info->isdn_channel;
 658                 sprintf(cmd.parm.setup.phone, "%s", n);
 659                 sprintf(cmd.parm.setup.eazmsn, "%s",
 660                         isdn_map_eaz2msn(m->msn, info->isdn_driver));
 661                 cmd.parm.setup.si1 = si;
 662                 cmd.parm.setup.si2 = m->mdmreg[REG_SI2];
 663                 cmd.command = ISDN_CMD_DIAL;
 664                 info->dialing = 1;
 665                 info->emu.carrierwait = 0;
 666                 strcpy(dev->num[i], n);
 667                 isdn_info_update();
 668                 isdn_command(&cmd);
 669                 isdn_timer_ctrl(ISDN_TIMER_CARRIER, 1);
 670         }
 671 }
 672
 673 /* isdn_tty_hangup() disassociates a tty from the real
 674  * ISDN-line (hangup). The usage-status is cleared
 675  * and some cleanup is done also.
 676  */
 677 void
 678 isdn_tty_modem_hup(modem_info * info, int local)
 679 {
 680         isdn_ctrl cmd;
 681         int di, ch;
 682
 683         if (!info)
 684                 return;
 685
 686         di = info->isdn_driver;
 687         ch = info->isdn_channel;
 688         if (di < 0 || ch < 0)
 689                 return;
 690
 691         info->isdn_driver = -1;
 692         info->isdn_channel = -1;
 693
 694 #ifdef ISDN_DEBUG_MODEM_HUP
 695         printk(KERN_DEBUG "Mhup ttyI%d\n", info->line);
 696 #endif
 697         info->rcvsched = 0;
 698         isdn_tty_flush_buffer(info->tty);
 699         if (info->online) {
 700                 info->last_lhup = local;
 701                 info->online = 0;
 702                 isdn_tty_modem_result(RESULT_NO_CARRIER, info);
 703         }
 704 #ifdef CONFIG_ISDN_AUDIO
 705         info->vonline = 0;
 706 #ifdef CONFIG_ISDN_TTY_FAX
 707         info->faxonline = 0;
 708         info->fax->phase = ISDN_FAX_PHASE_IDLE;
 709 #endif
 710         info->emu.vpar[4] = 0;
 711         info->emu.vpar[5] = 8;
 712         kfree(info->dtmf_state);
 713         info->dtmf_state = NULL;
 714         kfree(info->silence_state);
 715         info->silence_state = NULL;
 716         kfree(info->adpcms);
 717         info->adpcms = NULL;
 718         kfree(info->adpcmr);
 719         info->adpcmr = NULL;
 720 #endif
 721         if ((info->msr & UART_MSR_RI) &&
 722                 (info->emu.mdmreg[REG_RUNG] & BIT_RUNG))
 723                 isdn_tty_modem_result(RESULT_RUNG, info);
 724         info->msr &= ~(UART_MSR_DCD | UART_MSR_RI);
 725         info->lsr |= UART_LSR_TEMT;
 726
 727         if (local) {
 728                 cmd.driver = di;
 729                 cmd.command = ISDN_CMD_HANGUP;
 730                 cmd.arg = ch;
 731                 isdn_command(&cmd);
 732         }
 733
 734         isdn_all_eaz(di, ch);
 735         info->emu.mdmreg[REG_RINGCNT] = 0;
 736         isdn_free_channel(di, ch, 0);
 737
 738         if (info->drv_index >= 0) {
 739                 dev->m_idx[info->drv_index] = -1;
 740                 info->drv_index = -1;
 741         }
 742 }
 743
 744 /*
 745  * Begin of a CAPI like interface, currently used only for
 746  * supplementary service (CAPI 2.0 part III)
 747  */
 748 #include <linux/isdn/capicmd.h>
 749
 750 int
 751 isdn_tty_capi_facility(capi_msg *cm) {
 752         return(-1); /* dummy */
 753 }
 754
 755 /* isdn_tty_suspend() tries to suspend the current tty connection
 756  */
 757 static void
 758 isdn_tty_suspend(char *id, modem_info * info, atemu * m)
 759 {
 760         isdn_ctrl cmd;
 761
 762         int l;
 763
 764         if (!info)
 765                 return;
 766
 767 #ifdef ISDN_DEBUG_MODEM_SERVICES
 768         printk(KERN_DEBUG "Msusp ttyI%d\n", info->line);
 769 #endif
 770         l = strlen(id);
 771         if ((info->isdn_driver >= 0)) {
 772                 cmd.parm.cmsg.Length = l+18;
 773                 cmd.parm.cmsg.Command = CAPI_FACILITY;
 774                 cmd.parm.cmsg.Subcommand = CAPI_REQ;
 775                 cmd.parm.cmsg.adr.Controller = info->isdn_driver + 1;
 776                 cmd.parm.cmsg.para[0] = 3; /* 16 bit 0x0003 suplementary service */
 777                 cmd.parm.cmsg.para[1] = 0;
 778                 cmd.parm.cmsg.para[2] = l + 3;
 779                 cmd.parm.cmsg.para[3] = 4; /* 16 bit 0x0004 Suspend */
 780                 cmd.parm.cmsg.para[4] = 0;
 781                 cmd.parm.cmsg.para[5] = l;
 782                 strncpy(&cmd.parm.cmsg.para[6], id, l);
 783                 cmd.command = CAPI_PUT_MESSAGE;
 784                 cmd.driver = info->isdn_driver;
 785                 cmd.arg = info->isdn_channel;
 786                 isdn_command(&cmd);
 787         }
 788 }
 789
 790 /* isdn_tty_resume() tries to resume a suspended call
 791  * setup of the lower levels before that. unfortunatly here is no
 792  * checking for compatibility of used protocols implemented by Q931
 793  * It does the same things like isdn_tty_dial, the last command
 794  * is different, may be we can merge it.
 795  */
 796
 797 static void
 798 isdn_tty_resume(char *id, modem_info * info, atemu * m)
 799 {
 800         int usg = ISDN_USAGE_MODEM;
 801         int si = 7;
 802         int l2 = m->mdmreg[REG_L2PROT];
 803         isdn_ctrl cmd;
 804         ulong flags;
 805         int i;
 806         int j;
 807         int l;
 808
 809         l = strlen(id);
 810         for (j = 7; j >= 0; j--)
 811                 if (m->mdmreg[REG_SI1] & (1 << j)) {
 812                         si = bit2si[j];
 813                         break;
 814                 }
 815         usg = isdn_calc_usage(si, l2);
 816 #ifdef CONFIG_ISDN_AUDIO
 817         if ((si == 1) &&
 818                 (l2 != ISDN_PROTO_L2_MODEM)
 819 #ifdef CONFIG_ISDN_TTY_FAX
 820                 && (l2 != ISDN_PROTO_L2_FAX)
 821 #endif
 822                 ) {
 823                 l2 = ISDN_PROTO_L2_TRANS;
 824                 usg = ISDN_USAGE_VOICE;
 825         }
 826 #endif
 827         m->mdmreg[REG_SI1I] = si2bit[si];
 828         spin_lock_irqsave(&dev->lock, flags);
 829         i = isdn_get_free_channel(usg, l2, m->mdmreg[REG_L3PROT], -1, -1, m->msn);
 830         if (i < 0) {
 831                 spin_unlock_irqrestore(&dev->lock, flags);
 832                 isdn_tty_modem_result(RESULT_NO_DIALTONE, info);
 833         } else {
 834                 info->isdn_driver = dev->drvmap[i];
 835                 info->isdn_channel = dev->chanmap[i];
 836                 info->drv_index = i;
 837                 dev->m_idx[i] = info->line;
 838                 dev->usage[i] |= ISDN_USAGE_OUTGOING;
 839                 info->last_dir = 1;
 840 //              strcpy(info->last_num, n);
 841                 isdn_info_update();
 842                 spin_unlock_irqrestore(&dev->lock, flags);
 843                 cmd.driver = info->isdn_driver;
 844                 cmd.arg = info->isdn_channel;
 845                 cmd.command = ISDN_CMD_CLREAZ;
 846                 isdn_command(&cmd);
 847                 strcpy(cmd.parm.num, isdn_map_eaz2msn(m->msn, info->isdn_driver));
 848                 cmd.driver = info->isdn_driver;
 849                 cmd.command = ISDN_CMD_SETEAZ;
 850                 isdn_command(&cmd);
 851                 cmd.driver = info->isdn_driver;
 852                 cmd.command = ISDN_CMD_SETL2;
 853                 info->last_l2 = l2;
 854                 cmd.arg = info->isdn_channel + (l2 << 8);
 855                 isdn_command(&cmd);
 856                 cmd.driver = info->isdn_driver;
 857                 cmd.command = ISDN_CMD_SETL3;
 858                 cmd.arg = info->isdn_channel + (m->mdmreg[REG_L3PROT] << 8);
 859                 isdn_command(&cmd);
 860                 cmd.driver = info->isdn_driver;
 861                 cmd.arg = info->isdn_channel;
 862                 cmd.parm.cmsg.Length = l+18;
 863                 cmd.parm.cmsg.Command = CAPI_FACILITY;
 864                 cmd.parm.cmsg.Subcommand = CAPI_REQ;
 865                 cmd.parm.cmsg.adr.Controller = info->isdn_driver + 1;
 866                 cmd.parm.cmsg.para[0] = 3; /* 16 bit 0x0003 suplementary service */
 867                 cmd.parm.cmsg.para[1] = 0;
 868                 cmd.parm.cmsg.para[2] = l+3;
 869                 cmd.parm.cmsg.para[3] = 5; /* 16 bit 0x0005 Resume */
 870                 cmd.parm.cmsg.para[4] = 0;
 871                 cmd.parm.cmsg.para[5] = l;
 872                 strncpy(&cmd.parm.cmsg.para[6], id, l);
 873                 cmd.command =CAPI_PUT_MESSAGE;
 874                 info->dialing = 1;
 875 //              strcpy(dev->num[i], n);
 876                 isdn_info_update();
 877                 isdn_command(&cmd);
 878                 isdn_timer_ctrl(ISDN_TIMER_CARRIER, 1);
 879         }
 880 }
 881
 882 /* isdn_tty_send_msg() sends a message to a HL driver
 883  * This is used for hybrid modem cards to send AT commands to it
 884  */
 885
 886 static void
 887 isdn_tty_send_msg(modem_info * info, atemu * m, char *msg)
 888 {
 889         int usg = ISDN_USAGE_MODEM;
 890         int si = 7;
 891         int l2 = m->mdmreg[REG_L2PROT];
 892         isdn_ctrl cmd;
 893         ulong flags;
 894         int i;
 895         int j;
 896         int l;
 897
 898         l = strlen(msg);
 899         if (!l) {
 900                 isdn_tty_modem_result(RESULT_ERROR, info);
 901                 return;
 902         }
 903         for (j = 7; j >= 0; j--)
 904                 if (m->mdmreg[REG_SI1] & (1 << j)) {
 905                         si = bit2si[j];
 906                         break;
 907                 }
 908         usg = isdn_calc_usage(si, l2);
 909 #ifdef CONFIG_ISDN_AUDIO
 910         if ((si == 1) &&
 911                 (l2 != ISDN_PROTO_L2_MODEM)
 912 #ifdef CONFIG_ISDN_TTY_FAX
 913                 && (l2 != ISDN_PROTO_L2_FAX)
 914 #endif
 915                 ) {
 916                 l2 = ISDN_PROTO_L2_TRANS;
 917                 usg = ISDN_USAGE_VOICE;
 918         }
 919 #endif
 920         m->mdmreg[REG_SI1I] = si2bit[si];
 921         spin_lock_irqsave(&dev->lock, flags);
 922         i = isdn_get_free_channel(usg, l2, m->mdmreg[REG_L3PROT], -1, -1, m->msn);
 923         if (i < 0) {
 924                 spin_unlock_irqrestore(&dev->lock, flags);
 925                 isdn_tty_modem_result(RESULT_NO_DIALTONE, info);
 926         } else {
 927                 info->isdn_driver = dev->drvmap[i];
 928                 info->isdn_channel = dev->chanmap[i];
 929                 info->drv_index = i;
 930                 dev->m_idx[i] = info->line;
 931                 dev->usage[i] |= ISDN_USAGE_OUTGOING;
 932                 info->last_dir = 1;
 933                 isdn_info_update();
 934                 spin_unlock_irqrestore(&dev->lock, flags);
 935                 cmd.driver = info->isdn_driver;
 936                 cmd.arg = info->isdn_channel;
 937                 cmd.command = ISDN_CMD_CLREAZ;
 938                 isdn_command(&cmd);
 939                 strcpy(cmd.parm.num, isdn_map_eaz2msn(m->msn, info->isdn_driver));
 940                 cmd.driver = info->isdn_driver;
 941                 cmd.command = ISDN_CMD_SETEAZ;
 942                 isdn_command(&cmd);
 943                 cmd.driver = info->isdn_driver;
 944                 cmd.command = ISDN_CMD_SETL2;
 945                 info->last_l2 = l2;
 946                 cmd.arg = info->isdn_channel + (l2 << 8);
 947                 isdn_command(&cmd);
 948                 cmd.driver = info->isdn_driver;
 949                 cmd.command = ISDN_CMD_SETL3;
 950                 cmd.arg = info->isdn_channel + (m->mdmreg[REG_L3PROT] << 8);
 951                 isdn_command(&cmd);
 952                 cmd.driver = info->isdn_driver;
 953                 cmd.arg = info->isdn_channel;
 954                 cmd.parm.cmsg.Length = l+14;
 955                 cmd.parm.cmsg.Command = CAPI_MANUFACTURER;
 956                 cmd.parm.cmsg.Subcommand = CAPI_REQ;
 957                 cmd.parm.cmsg.adr.Controller = info->isdn_driver + 1;
 958                 cmd.parm.cmsg.para[0] = l+1;
 959                 strncpy(&cmd.parm.cmsg.para[1], msg, l);
 960                 cmd.parm.cmsg.para[l+1] = 0xd;
 961                 cmd.command =CAPI_PUT_MESSAGE;
 962 /*              info->dialing = 1;
 963                 strcpy(dev->num[i], n);
 964                 isdn_info_update();
 965 */
 966                 isdn_command(&cmd);
 967         }
 968 }
 969
 970 static inline int
 971 isdn_tty_paranoia_check(modem_info *info, char *name, const char *routine)
 972 {
 973 #ifdef MODEM_PARANOIA_CHECK
 974         if (!info) {
 975                 printk(KERN_WARNING "isdn_tty: null info_struct for %s in %s\n",
 976                         name, routine);
 977                 return 1;
 978         }
 979         if (info->magic != ISDN_ASYNC_MAGIC) {
 980                 printk(KERN_WARNING "isdn_tty: bad magic for modem struct %s in %s\n",
 981                        name, routine);
 982                 return 1;
 983         }
 984 #endif
 985         return 0;
 986 }
 987
 988 /*
 989  * This routine is called to set the UART divisor registers to match
 990  * the specified baud rate for a serial port.
 991  */
 992 static void
 993 isdn_tty_change_speed(modem_info * info)
 994 {
 995         uint cflag,
 996          cval,
 997          fcr,
 998          quot;
 999         int i;
1000
1001         if (!info->tty || !info->tty->termios)
1002                 return;
1003         cflag = info->tty->termios->c_cflag;
1004
1005         quot = i = cflag & CBAUD;
1006         if (i & CBAUDEX) {
1007                 i &= ~CBAUDEX;
1008                 if (i < 1 || i > 2)
1009                         info->tty->termios->c_cflag &= ~CBAUDEX;
1010                 else
1011                         i += 15;
1012         }
1013         if (quot) {
1014                 info->mcr |= UART_MCR_DTR;
1015                 isdn_tty_modem_ncarrier(info);
1016         } else {
1017                 info->mcr &= ~UART_MCR_DTR;
1018                 if (info->emu.mdmreg[REG_DTRHUP] & BIT_DTRHUP) {
1019 #ifdef ISDN_DEBUG_MODEM_HUP
1020                         printk(KERN_DEBUG "Mhup in changespeed\n");
1021 #endif
1022                         if (info->online)
1023                                 info->ncarrier = 1;
1024                         isdn_tty_modem_reset_regs(info, 0);
1025                         isdn_tty_modem_hup(info, 1);
1026                 }
1027                 return;
1028         }
1029         /* byte size and parity */
1030         cval = cflag & (CSIZE | CSTOPB);
1031         cval >>= 4;
1032         if (cflag & PARENB)
1033                 cval |= UART_LCR_PARITY;
1034         if (!(cflag & PARODD))
1035                 cval |= UART_LCR_EPAR;
1036         fcr = 0;
1037
1038         /* CTS flow control flag and modem status interrupts */
1039         if (cflag & CRTSCTS) {
1040                 info->flags |= ISDN_ASYNC_CTS_FLOW;
1041         } else
1042                 info->flags &= ~ISDN_ASYNC_CTS_FLOW;
1043         if (cflag & CLOCAL)
1044                 info->flags &= ~ISDN_ASYNC_CHECK_CD;
1045         else {
1046                 info->flags |= ISDN_ASYNC_CHECK_CD;
1047         }
1048 }
1049
1050 static int
1051 isdn_tty_startup(modem_info * info)
1052 {
1053         if (info->flags & ISDN_ASYNC_INITIALIZED)
1054                 return 0;
1055         isdn_lock_drivers();
1056 #ifdef ISDN_DEBUG_MODEM_OPEN
1057         printk(KERN_DEBUG "starting up ttyi%d ...\n", info->line);
1058 #endif
1059         /*
1060          * Now, initialize the UART
1061          */
1062         info->mcr = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
1063         if (info->tty)
1064                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1065         /*
1066          * and set the speed of the serial port
1067          */
1068         isdn_tty_change_speed(info);
1069
1070         info->flags |= ISDN_ASYNC_INITIALIZED;
1071         info->msr |= (UART_MSR_DSR | UART_MSR_CTS);
1072         info->send_outstanding = 0;
1073         return 0;
1074 }
1075
1076 /*
1077  * This routine will shutdown a serial port; interrupts are disabled, and
1078  * DTR is dropped if the hangup on close termio flag is on.
1079  */
1080 static void
1081 isdn_tty_shutdown(modem_info * info)
1082 {
1083         if (!(info->flags & ISDN_ASYNC_INITIALIZED))
1084                 return;
1085 #ifdef ISDN_DEBUG_MODEM_OPEN
1086         printk(KERN_DEBUG "Shutting down isdnmodem port %d ....\n", info->line);
1087 #endif
1088         isdn_unlock_drivers();
1089         info->msr &= ~UART_MSR_RI;
1090         if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
1091                 info->mcr &= ~(UART_MCR_DTR | UART_MCR_RTS);
1092                 if (info->emu.mdmreg[REG_DTRHUP] & BIT_DTRHUP) {
1093                         isdn_tty_modem_reset_regs(info, 0);
1094 #ifdef ISDN_DEBUG_MODEM_HUP
1095                         printk(KERN_DEBUG "Mhup in isdn_tty_shutdown\n");
1096 #endif
1097                         isdn_tty_modem_hup(info, 1);
1098                 }
1099         }
1100         if (info->tty)
1101                 set_bit(TTY_IO_ERROR, &info->tty->flags);
1102
1103         info->flags &= ~ISDN_ASYNC_INITIALIZED;
1104 }
1105
1106 /* isdn_tty_write() is the main send-routine. It is called from the upper
1107  * levels within the kernel to perform sending data. Depending on the
1108  * online-flag it either directs output to the at-command-interpreter or
1109  * to the lower level. Additional tasks done here:
1110  *  - If online, check for escape-sequence (+++)
1111  *  - If sending audio-data, call isdn_tty_DLEdown() to parse DLE-codes.
1112  *  - If receiving audio-data, call isdn_tty_end_vrx() to abort if needed.
1113  *  - If dialing, abort dial.
1114  */
1115 static int
1116 isdn_tty_write(struct tty_struct *tty, const u_char * buf, int count)
1117 {
1118         int c;
1119         int total = 0;
1120         modem_info *info = (modem_info *) tty->driver_data;
1121         atemu *m = &info->emu;
1122
1123         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_write"))
1124                 return 0;
1125         /* See isdn_tty_senddown() */
1126         atomic_inc(&info->xmit_lock);
1127         while (1) {
1128                 c = count;
1129                 if (c > info->xmit_size - info->xmit_count)
1130                         c = info->xmit_size - info->xmit_count;
1131                 if (info->isdn_driver >= 0 && c > dev->drv[info->isdn_driver]->maxbufsize)
1132                         c = dev->drv[info->isdn_driver]->maxbufsize;
1133                 if (c <= 0)
1134                         break;
1135                 if ((info->online > 1)
1136 #ifdef CONFIG_ISDN_AUDIO
1137                     || (info->vonline & 3)
1138 #endif
1139                         ) {
1140 #ifdef CONFIG_ISDN_AUDIO
1141                         if (!info->vonline)
1142 #endif
1143                                 isdn_tty_check_esc(buf, m->mdmreg[REG_ESC], c,
1144                                                    &(m->pluscount),
1145                                                    &(m->lastplus));
1146                         memcpy(&(info->xmit_buf[info->xmit_count]), buf, c);
1147 #ifdef CONFIG_ISDN_AUDIO
1148                         if (info->vonline) {
1149                                 int cc = isdn_tty_handleDLEdown(info, m, c);
1150                                 if (info->vonline & 2) {
1151                                         if (!cc) {
1152                                                 /* If DLE decoding results in zero-transmit, but
1153                                                  * c originally was non-zero, do a wakeup.
1154                                                  */
1155                                                 tty_wakeup(tty);
1156                                                 info->msr |= UART_MSR_CTS;
1157                                                 info->lsr |= UART_LSR_TEMT;
1158                                         }
1159                                         info->xmit_count += cc;
1160                                 }
1161                                 if ((info->vonline & 3) == 1) {
1162                                         /* Do NOT handle Ctrl-Q or Ctrl-S
1163                                          * when in full-duplex audio mode.
1164                                          */
1165                                         if (isdn_tty_end_vrx(buf, c)) {
1166                                                 info->vonline &= ~1;
1167 #ifdef ISDN_DEBUG_MODEM_VOICE
1168                                                 printk(KERN_DEBUG
1169                                                        "got !^Q/^S, send DLE-ETX,VCON on ttyI%d\n",
1170                                                        info->line);
1171 #endif
1172                                                 isdn_tty_at_cout("\020\003\r\nVCON\r\n", info);
1173                                         }
1174                                 }
1175                         } else
1176                         if (TTY_IS_FCLASS1(info)) {
1177                                 int cc = isdn_tty_handleDLEdown(info, m, c);
1178
1179                                 if (info->vonline & 4) { /* ETX seen */
1180                                         isdn_ctrl c;
1181
1182                                         c.command = ISDN_CMD_FAXCMD;
1183                                         c.driver = info->isdn_driver;
1184                                         c.arg = info->isdn_channel;
1185                                         c.parm.aux.cmd = ISDN_FAX_CLASS1_CTRL;
1186                                         c.parm.aux.subcmd = ETX;
1187                                         isdn_command(&c);
1188                                 }
1189                                 info->vonline = 0;
1190 #ifdef ISDN_DEBUG_MODEM_VOICE
1191                                 printk(KERN_DEBUG "fax dle cc/c %d/%d\n", cc, c);
1192 #endif
1193                                 info->xmit_count += cc;
1194                         } else
1195 #endif
1196                                 info->xmit_count += c;
1197                 } else {
1198                         info->msr |= UART_MSR_CTS;
1199                         info->lsr |= UART_LSR_TEMT;
1200                         if (info->dialing) {
1201                                 info->dialing = 0;
1202 #ifdef ISDN_DEBUG_MODEM_HUP
1203                                 printk(KERN_DEBUG "Mhup in isdn_tty_write\n");
1204 #endif
1205                                 isdn_tty_modem_result(RESULT_NO_CARRIER, info);
1206                                 isdn_tty_modem_hup(info, 1);
1207                         } else
1208                                 c = isdn_tty_edit_at(buf, c, info);
1209                 }
1210                 buf += c;
1211                 count -= c;
1212                 total += c;
1213         }
1214         atomic_dec(&info->xmit_lock);
1215         if ((info->xmit_count) || !skb_queue_empty(&info->xmit_queue)) {
1216                 if (m->mdmreg[REG_DXMT] & BIT_DXMT) {
1217                         isdn_tty_senddown(info);
1218                         isdn_tty_tint(info);
1219                 }
1220                 isdn_timer_ctrl(ISDN_TIMER_MODEMXMIT, 1);
1221         }
1222         return total;
1223 }
1224
1225 static int
1226 isdn_tty_write_room(struct tty_struct *tty)
1227 {
1228         modem_info *info = (modem_info *) tty->driver_data;
1229         int ret;
1230
1231         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_write_room"))
1232                 return 0;
1233         if (!info->online)
1234                 return info->xmit_size;
1235         ret = info->xmit_size - info->xmit_count;
1236         return (ret < 0) ? 0 : ret;
1237 }
1238
1239 static int
1240 isdn_tty_chars_in_buffer(struct tty_struct *tty)
1241 {
1242         modem_info *info = (modem_info *) tty->driver_data;
1243
1244         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_chars_in_buffer"))
1245                 return 0;
1246         if (!info->online)
1247                 return 0;
1248         return (info->xmit_count);
1249 }
1250
1251 static void
1252 isdn_tty_flush_buffer(struct tty_struct *tty)
1253 {
1254         modem_info *info;
1255
1256         if (!tty) {
1257                 return;
1258         }
1259         info = (modem_info *) tty->driver_data;
1260         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_flush_buffer")) {
1261                 return;
1262         }
1263         isdn_tty_cleanup_xmit(info);
1264         info->xmit_count = 0;
1265         wake_up_interruptible(&tty->write_wait);
1266         tty_wakeup(tty);
1267 }
1268
1269 static void
1270 isdn_tty_flush_chars(struct tty_struct *tty)
1271 {
1272         modem_info *info = (modem_info *) tty->driver_data;
1273
1274         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_flush_chars"))
1275                 return;
1276         if ((info->xmit_count) || !skb_queue_empty(&info->xmit_queue))
1277                 isdn_timer_ctrl(ISDN_TIMER_MODEMXMIT, 1);
1278 }
1279
1280 /*
1281  * ------------------------------------------------------------
1282  * isdn_tty_throttle()
1283  *
1284  * This routine is called by the upper-layer tty layer to signal that
1285  * incoming characters should be throttled.
1286  * ------------------------------------------------------------
1287  */
1288 static void
1289 isdn_tty_throttle(struct tty_struct *tty)
1290 {
1291         modem_info *info = (modem_info *) tty->driver_data;
1292
1293         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_throttle"))
1294                 return;
1295         if (I_IXOFF(tty))
1296                 info->x_char = STOP_CHAR(tty);
1297         info->mcr &= ~UART_MCR_RTS;
1298 }
1299
1300 static void
1301 isdn_tty_unthrottle(struct tty_struct *tty)
1302 {
1303         modem_info *info = (modem_info *) tty->driver_data;
1304
1305         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_unthrottle"))
1306                 return;
1307         if (I_IXOFF(tty)) {
1308                 if (info->x_char)
1309                         info->x_char = 0;
1310                 else
1311                         info->x_char = START_CHAR(tty);
1312         }
1313         info->mcr |= UART_MCR_RTS;
1314 }
1315
1316 /*
1317  * ------------------------------------------------------------
1318  * isdn_tty_ioctl() and friends
1319  * ------------------------------------------------------------
1320  */
1321
1322 /*
1323  * isdn_tty_get_lsr_info - get line status register info
1324  *
1325  * Purpose: Let user call ioctl() to get info when the UART physically
1326  *          is emptied.  On bus types like RS485, the transmitter must
1327  *          release the bus after transmitting. This must be done when
1328  *          the transmit shift register is empty, not be done when the
1329  *          transmit holding register is empty.  This functionality
1330  *          allows RS485 driver to be written in user space.
1331  */
1332 static int
1333 isdn_tty_get_lsr_info(modem_info * info, uint __user * value)
1334 {
1335         u_char status;
1336         uint result;
1337
1338         status = info->lsr;
1339         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1340         return put_user(result, value);
1341 }
1342
1343
1344 static int
1345 isdn_tty_tiocmget(struct tty_struct *tty, struct file *file)
1346 {
1347         modem_info *info = (modem_info *) tty->driver_data;
1348         u_char control, status;
1349
1350         if (isdn_tty_paranoia_check(info, tty->name, __FUNCTION__))
1351                 return -ENODEV;
1352         if (tty->flags & (1 << TTY_IO_ERROR))
1353                 return -EIO;
1354
1355 #ifdef ISDN_DEBUG_MODEM_IOCTL
1356         printk(KERN_DEBUG "ttyI%d ioctl TIOCMGET\n", info->line);
1357 #endif
1358
1359         control = info->mcr;
1360         status = info->msr;
1361         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
1362             | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
1363             | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
1364             | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
1365             | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
1366             | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1367 }
1368
1369 static int
1370 isdn_tty_tiocmset(struct tty_struct *tty, struct file *file,
1371                 unsigned int set, unsigned int clear)
1372 {
1373         modem_info *info = (modem_info *) tty->driver_data;
1374
1375         if (isdn_tty_paranoia_check(info, tty->name, __FUNCTION__))
1376                 return -ENODEV;
1377         if (tty->flags & (1 << TTY_IO_ERROR))
1378                 return -EIO;
1379
1380 #ifdef ISDN_DEBUG_MODEM_IOCTL
1381         printk(KERN_DEBUG "ttyI%d ioctl TIOCMxxx: %x %x\n", info->line, set, clear);
1382 #endif
1383
1384         if (set & TIOCM_RTS)
1385                 info->mcr |= UART_MCR_RTS;
1386         if (set & TIOCM_DTR) {
1387                 info->mcr |= UART_MCR_DTR;
1388                 isdn_tty_modem_ncarrier(info);
1389         }
1390
1391         if (clear & TIOCM_RTS)
1392                 info->mcr &= ~UART_MCR_RTS;
1393         if (clear & TIOCM_DTR) {
1394                 info->mcr &= ~UART_MCR_DTR;
1395                 if (info->emu.mdmreg[REG_DTRHUP] & BIT_DTRHUP) {
1396                         isdn_tty_modem_reset_regs(info, 0);
1397 #ifdef ISDN_DEBUG_MODEM_HUP
1398                         printk(KERN_DEBUG "Mhup in TIOCMSET\n");
1399 #endif
1400                         if (info->online)
1401                                 info->ncarrier = 1;
1402                         isdn_tty_modem_hup(info, 1);
1403                 }
1404         }
1405         return 0;
1406 }
1407
1408 static int
1409 isdn_tty_ioctl(struct tty_struct *tty, struct file *file,
1410                uint cmd, ulong arg)
1411 {
1412         modem_info *info = (modem_info *) tty->driver_data;
1413         int retval;
1414
1415         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_ioctl"))
1416                 return -ENODEV;
1417         if (tty->flags & (1 << TTY_IO_ERROR))
1418                 return -EIO;
1419         switch (cmd) {
1420                 case TCSBRK:   /* SVID version: non-zero arg --> no break */
1421 #ifdef ISDN_DEBUG_MODEM_IOCTL
1422                         printk(KERN_DEBUG "ttyI%d ioctl TCSBRK\n", info->line);
1423 #endif
1424                         retval = tty_check_change(tty);
1425                         if (retval)
1426                                 return retval;
1427                         tty_wait_until_sent(tty, 0);
1428                         return 0;
1429                 case TCSBRKP:  /* support for POSIX tcsendbreak() */
1430 #ifdef ISDN_DEBUG_MODEM_IOCTL
1431                         printk(KERN_DEBUG "ttyI%d ioctl TCSBRKP\n", info->line);
1432 #endif
1433                         retval = tty_check_change(tty);
1434                         if (retval)
1435                                 return retval;
1436                         tty_wait_until_sent(tty, 0);
1437                         return 0;
1438                 case TIOCGSOFTCAR:
1439 #ifdef ISDN_DEBUG_MODEM_IOCTL
1440                         printk(KERN_DEBUG "ttyI%d ioctl TIOCGSOFTCAR\n", info->line);
1441 #endif
1442                         return put_user(C_CLOCAL(tty) ? 1 : 0, (ulong __user *) arg);
1443                 case TIOCSSOFTCAR:
1444 #ifdef ISDN_DEBUG_MODEM_IOCTL
1445                         printk(KERN_DEBUG "ttyI%d ioctl TIOCSSOFTCAR\n", info->line);
1446 #endif
1447                         if (get_user(arg, (ulong __user *) arg))
1448                                 return -EFAULT;
1449                         tty->termios->c_cflag =
1450                             ((tty->termios->c_cflag & ~CLOCAL) |
1451                              (arg ? CLOCAL : 0));
1452                         return 0;
1453                 case TIOCSERGETLSR:     /* Get line status register */
1454 #ifdef ISDN_DEBUG_MODEM_IOCTL
1455                         printk(KERN_DEBUG "ttyI%d ioctl TIOCSERGETLSR\n", info->line);
1456 #endif
1457                         return isdn_tty_get_lsr_info(info, (uint __user *) arg);
1458                 default:
1459 #ifdef ISDN_DEBUG_MODEM_IOCTL
1460                         printk(KERN_DEBUG "UNKNOWN ioctl 0x%08x on ttyi%d\n", cmd, info->line);
1461 #endif
1462                         return -ENOIOCTLCMD;
1463         }
1464         return 0;
1465 }
1466
1467 static void
1468 isdn_tty_set_termios(struct tty_struct *tty, struct termios *old_termios)
1469 {
1470         modem_info *info = (modem_info *) tty->driver_data;
1471
1472         if (!old_termios)
1473                 isdn_tty_change_speed(info);
1474         else {
1475                 if (tty->termios->c_cflag == old_termios->c_cflag)
1476                         return;
1477                 isdn_tty_change_speed(info);
1478                 if ((old_termios->c_cflag & CRTSCTS) &&
1479                     !(tty->termios->c_cflag & CRTSCTS)) {
1480                         tty->hw_stopped = 0;
1481                 }
1482         }
1483 }
1484
1485 /*
1486  * ------------------------------------------------------------
1487  * isdn_tty_open() and friends
1488  * ------------------------------------------------------------
1489  */
1490 static int
1491 isdn_tty_block_til_ready(struct tty_struct *tty, struct file *filp, modem_info * info)
1492 {
1493         DECLARE_WAITQUEUE(wait, NULL);
1494         int do_clocal = 0;
1495         int retval;
1496
1497         /*
1498          * If the device is in the middle of being closed, then block
1499          * until it's done, and then try again.
1500          */
1501         if (tty_hung_up_p(filp) ||
1502             (info->flags & ISDN_ASYNC_CLOSING)) {
1503                 if (info->flags & ISDN_ASYNC_CLOSING)
1504                         interruptible_sleep_on(&info->close_wait);
1505 #ifdef MODEM_DO_RESTART
1506                 if (info->flags & ISDN_ASYNC_HUP_NOTIFY)
1507                         return -EAGAIN;
1508                 else
1509                         return -ERESTARTSYS;
1510 #else
1511                 return -EAGAIN;
1512 #endif
1513         }
1514         /*
1515          * If non-blocking mode is set, then make the check up front
1516          * and then exit.
1517          */
1518         if ((filp->f_flags & O_NONBLOCK) ||
1519             (tty->flags & (1 << TTY_IO_ERROR))) {
1520                 if (info->flags & ISDN_ASYNC_CALLOUT_ACTIVE)
1521                         return -EBUSY;
1522                 info->flags |= ISDN_ASYNC_NORMAL_ACTIVE;
1523                 return 0;
1524         }
1525         if (info->flags & ISDN_ASYNC_CALLOUT_ACTIVE) {
1526                 if (info->normal_termios.c_cflag & CLOCAL)
1527                         do_clocal = 1;
1528         } else {
1529                 if (tty->termios->c_cflag & CLOCAL)
1530                         do_clocal = 1;
1531         }
1532         /*
1533          * Block waiting for the carrier detect and the line to become
1534          * free (i.e., not in use by the callout).  While we are in
1535          * this loop, info->count is dropped by one, so that
1536          * isdn_tty_close() knows when to free things.  We restore it upon
1537          * exit, either normal or abnormal.
1538          */
1539         retval = 0;
1540         add_wait_queue(&info->open_wait, &wait);
1541 #ifdef ISDN_DEBUG_MODEM_OPEN
1542         printk(KERN_DEBUG "isdn_tty_block_til_ready before block: ttyi%d, count = %d\n",
1543                info->line, info->count);
1544 #endif
1545         if (!(tty_hung_up_p(filp)))
1546                 info->count--;
1547         info->blocked_open++;
1548         while (1) {
1549                 set_current_state(TASK_INTERRUPTIBLE);
1550                 if (tty_hung_up_p(filp) ||
1551                     !(info->flags & ISDN_ASYNC_INITIALIZED)) {
1552 #ifdef MODEM_DO_RESTART
1553                         if (info->flags & ISDN_ASYNC_HUP_NOTIFY)
1554                                 retval = -EAGAIN;
1555                         else
1556                                 retval = -ERESTARTSYS;
1557 #else
1558                         retval = -EAGAIN;
1559 #endif
1560                         break;
1561                 }
1562                 if (!(info->flags & ISDN_ASYNC_CALLOUT_ACTIVE) &&
1563                     !(info->flags & ISDN_ASYNC_CLOSING) &&
1564                     (do_clocal || (info->msr & UART_MSR_DCD))) {
1565                         break;
1566                 }
1567                 if (signal_pending(current)) {
1568                         retval = -ERESTARTSYS;
1569                         break;
1570                 }
1571 #ifdef ISDN_DEBUG_MODEM_OPEN
1572                 printk(KERN_DEBUG "isdn_tty_block_til_ready blocking: ttyi%d, count = %d\n",
1573                        info->line, info->count);
1574 #endif
1575                 schedule();
1576         }
1577         current->state = TASK_RUNNING;
1578         remove_wait_queue(&info->open_wait, &wait);
1579         if (!tty_hung_up_p(filp))
1580                 info->count++;
1581         info->blocked_open--;
1582 #ifdef ISDN_DEBUG_MODEM_OPEN
1583         printk(KERN_DEBUG "isdn_tty_block_til_ready after blocking: ttyi%d, count = %d\n",
1584                info->line, info->count);
1585 #endif
1586         if (retval)
1587                 return retval;
1588         info->flags |= ISDN_ASYNC_NORMAL_ACTIVE;
1589         return 0;
1590 }
1591
1592 /*
1593  * This routine is called whenever a serial port is opened.  It
1594  * enables interrupts for a serial port, linking in its async structure into
1595  * the IRQ chain.   It also performs the serial-specific
1596  * initialization for the tty structure.
1597  */
1598 static int
1599 isdn_tty_open(struct tty_struct *tty, struct file *filp)
1600 {
1601         modem_info *info;
1602         int retval, line;
1603
1604         line = tty->index;
1605         if (line < 0 || line > ISDN_MAX_CHANNELS)
1606                 return -ENODEV;
1607         info = &dev->mdm.info[line];
1608         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_open"))
1609                 return -ENODEV;
1610         if (!try_module_get(info->owner)) {
1611                 printk(KERN_WARNING "%s: cannot reserve module\n", __FUNCTION__);
1612                 return -ENODEV;
1613         }
1614 #ifdef ISDN_DEBUG_MODEM_OPEN
1615         printk(KERN_DEBUG "isdn_tty_open %s, count = %d\n", tty->name,
1616                info->count);
1617 #endif
1618         info->count++;
1619         tty->driver_data = info;
1620         info->tty = tty;
1621         /*
1622          * Start up serial port
1623          */
1624         retval = isdn_tty_startup(info);
1625         if (retval) {
1626 #ifdef ISDN_DEBUG_MODEM_OPEN
1627                 printk(KERN_DEBUG "isdn_tty_open return after startup\n");
1628 #endif
1629                 module_put(info->owner);
1630                 return retval;
1631         }
1632         retval = isdn_tty_block_til_ready(tty, filp, info);
1633         if (retval) {
1634 #ifdef ISDN_DEBUG_MODEM_OPEN
1635                 printk(KERN_DEBUG "isdn_tty_open return after isdn_tty_block_til_ready \n");
1636 #endif
1637                 module_put(info->owner);
1638                 return retval;
1639         }
1640 #ifdef ISDN_DEBUG_MODEM_OPEN
1641         printk(KERN_DEBUG "isdn_tty_open ttyi%d successful...\n", info->line);
1642 #endif
1643         dev->modempoll++;
1644 #ifdef ISDN_DEBUG_MODEM_OPEN
1645         printk(KERN_DEBUG "isdn_tty_open normal exit\n");
1646 #endif
1647         return 0;
1648 }
1649
1650 static void
1651 isdn_tty_close(struct tty_struct *tty, struct file *filp)
1652 {
1653         modem_info *info = (modem_info *) tty->driver_data;
1654         ulong timeout;
1655
1656         if (!info || isdn_tty_paranoia_check(info, tty->name, "isdn_tty_close"))
1657                 return;
1658         if (tty_hung_up_p(filp)) {
1659 #ifdef ISDN_DEBUG_MODEM_OPEN
1660                 printk(KERN_DEBUG "isdn_tty_close return after tty_hung_up_p\n");
1661 #endif
1662                 return;
1663         }
1664         if ((tty->count == 1) && (info->count != 1)) {
1665                 /*
1666                  * Uh, oh.  tty->count is 1, which means that the tty
1667                  * structure will be freed.  Info->count should always
1668                  * be one in these conditions.  If it's greater than
1669                  * one, we've got real problems, since it means the
1670                  * serial port won't be shutdown.
1671                  */
1672                 printk(KERN_ERR "isdn_tty_close: bad port count; tty->count is 1, "
1673                        "info->count is %d\n", info->count);
1674                 info->count = 1;
1675         }
1676         if (--info->count < 0) {
1677                 printk(KERN_ERR "isdn_tty_close: bad port count for ttyi%d: %d\n",
1678                        info->line, info->count);
1679                 info->count = 0;
1680         }
1681         if (info->count) {
1682 #ifdef ISDN_DEBUG_MODEM_OPEN
1683                 printk(KERN_DEBUG "isdn_tty_close after info->count != 0\n");
1684 #endif
1685                 module_put(info->owner);
1686                 return;
1687         }
1688         info->flags |= ISDN_ASYNC_CLOSING;
1689         /*
1690          * Save the termios structure, since this port may have
1691          * separate termios for callout and dialin.
1692          */
1693         if (info->flags & ISDN_ASYNC_NORMAL_ACTIVE)
1694                 info->normal_termios = *tty->termios;
1695         if (info->flags & ISDN_ASYNC_CALLOUT_ACTIVE)
1696                 info->callout_termios = *tty->termios;
1697
1698         tty->closing = 1;
1699         /*
1700          * At this point we stop accepting input.  To do this, we
1701          * disable the receive line status interrupts, and tell the
1702          * interrupt driver to stop checking the data ready bit in the
1703          * line status register.
1704          */
1705         if (info->flags & ISDN_ASYNC_INITIALIZED) {
1706                 tty_wait_until_sent(tty, 3000); /* 30 seconds timeout */
1707                 /*
1708                  * Before we drop DTR, make sure the UART transmitter
1709                  * has completely drained; this is especially
1710                  * important if there is a transmit FIFO!
1711                  */
1712                 timeout = jiffies + HZ;
1713                 while (!(info->lsr & UART_LSR_TEMT)) {
1714                         schedule_timeout_interruptible(20);
1715                         if (time_after(jiffies,timeout))
1716                                 break;
1717                 }
1718         }
1719         dev->modempoll--;
1720         isdn_tty_shutdown(info);
1721
1722         if (tty->driver->flush_buffer)
1723                 tty->driver->flush_buffer(tty);
1724         tty_ldisc_flush(tty);
1725         info->tty = NULL;
1726         info->ncarrier = 0;
1727         tty->closing = 0;
1728         module_put(info->owner);
1729         if (info->blocked_open) {
1730                 msleep_interruptible(500);
1731                 wake_up_interruptible(&info->open_wait);
1732         }
1733         info->flags &= ~(ISDN_ASYNC_NORMAL_ACTIVE | ISDN_ASYNC_CLOSING);
1734         wake_up_interruptible(&info->close_wait);
1735 #ifdef ISDN_DEBUG_MODEM_OPEN
1736         printk(KERN_DEBUG "isdn_tty_close normal exit\n");
1737 #endif
1738 }
1739
1740 /*
1741  * isdn_tty_hangup() --- called by tty_hangup() when a hangup is signaled.
1742  */
1743 static void
1744 isdn_tty_hangup(struct tty_struct *tty)
1745 {
1746         modem_info *info = (modem_info *) tty->driver_data;
1747
1748         if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_hangup"))
1749                 return;
1750         isdn_tty_shutdown(info);
1751         info->count = 0;
1752         info->flags &= ~(ISDN_ASYNC_NORMAL_ACTIVE | ISDN_ASYNC_CALLOUT_ACTIVE);
1753         info->tty = NULL;
1754         wake_up_interruptible(&info->open_wait);
1755 }
1756
1757 /* This routine initializes all emulator-data.
1758  */
1759 static void
1760 isdn_tty_reset_profile(atemu * m)
1761 {
1762         m->profile[0] = 0;
1763         m->profile[1] = 0;
1764         m->profile[2] = 43;
1765         m->profile[3] = 13;
1766         m->profile[4] = 10;
1767         m->profile[5] = 8;
1768         m->profile[6] = 3;
1769         m->profile[7] = 60;
1770         m->profile[8] = 2;
1771         m->profile[9] = 6;
1772         m->profile[10] = 7;
1773         m->profile[11] = 70;
1774         m->profile[12] = 0x45;
1775         m->profile[13] = 4;
1776         m->profile[14] = ISDN_PROTO_L2_X75I;
1777         m->profile[15] = ISDN_PROTO_L3_TRANS;
1778         m->profile[16] = ISDN_SERIAL_XMIT_SIZE / 16;
1779         m->profile[17] = ISDN_MODEM_WINSIZE;
1780         m->profile[18] = 4;
1781         m->profile[19] = 0;
1782         m->profile[20] = 0;
1783         m->profile[23] = 0;
1784         m->pmsn[0] = '\0';
1785         m->plmsn[0] = '\0';
1786 }
1787
1788 #ifdef CONFIG_ISDN_AUDIO
1789 static void
1790 isdn_tty_modem_reset_vpar(atemu * m)
1791 {
1792         m->vpar[0] = 2;         /* Voice-device            (2 = phone line) */
1793         m->vpar[1] = 0;         /* Silence detection level (0 = none      ) */
1794         m->vpar[2] = 70;        /* Silence interval        (7 sec.        ) */
1795         m->vpar[3] = 2;         /* Compression type        (1 = ADPCM-2   ) */
1796         m->vpar[4] = 0;         /* DTMF detection level    (0 = softcode  ) */
1797         m->vpar[5] = 8;         /* DTMF interval           (8 * 5 ms.     ) */
1798 }
1799 #endif
1800
1801 #ifdef CONFIG_ISDN_TTY_FAX
1802 static void
1803 isdn_tty_modem_reset_faxpar(modem_info * info)
1804 {
1805         T30_s *f = info->fax;
1806
1807         f->code = 0;
1808         f->phase = ISDN_FAX_PHASE_IDLE;
1809         f->direction = 0;
1810         f->resolution = 1;      /* fine */
1811         f->rate = 5;            /* 14400 bit/s */
1812         f->width = 0;
1813         f->length = 0;
1814         f->compression = 0;
1815         f->ecm = 0;
1816         f->binary = 0;
1817         f->scantime = 0;
1818         memset(&f->id[0], 32, FAXIDLEN - 1);
1819         f->id[FAXIDLEN - 1] = 0;
1820         f->badlin = 0;
1821         f->badmul = 0;
1822         f->bor = 0;
1823         f->nbc = 0;
1824         f->cq = 0;
1825         f->cr = 0;
1826         f->ctcrty = 0;
1827         f->minsp = 0;
1828         f->phcto = 30;
1829         f->rel = 0;
1830         memset(&f->pollid[0], 32, FAXIDLEN - 1);
1831         f->pollid[FAXIDLEN - 1] = 0;
1832 }
1833 #endif
1834
1835 static void
1836 isdn_tty_modem_reset_regs(modem_info * info, int force)
1837 {
1838         atemu *m = &info->emu;
1839         if ((m->mdmreg[REG_DTRR] & BIT_DTRR) || force) {
1840                 memcpy(m->mdmreg, m->profile, ISDN_MODEM_NUMREG);
1841                 memcpy(m->msn, m->pmsn, ISDN_MSNLEN);
1842                 memcpy(m->lmsn, m->plmsn, ISDN_LMSNLEN);
1843                 info->xmit_size = m->mdmreg[REG_PSIZE] * 16;
1844         }
1845 #ifdef CONFIG_ISDN_AUDIO
1846         isdn_tty_modem_reset_vpar(m);
1847 #endif
1848 #ifdef CONFIG_ISDN_TTY_FAX
1849         isdn_tty_modem_reset_faxpar(info);
1850 #endif
1851         m->mdmcmdl = 0;
1852 }
1853
1854 static void
1855 modem_write_profile(atemu * m)
1856 {
1857         memcpy(m->profile, m->mdmreg, ISDN_MODEM_NUMREG);
1858         memcpy(m->pmsn, m->msn, ISDN_MSNLEN);
1859         memcpy(m->plmsn, m->lmsn, ISDN_LMSNLEN);
1860         if (dev->profd)
1861                 send_sig(SIGIO, dev->profd, 1);
1862 }
1863
1864 static struct tty_operations modem_ops = {
1865         .open = isdn_tty_open,
1866         .close = isdn_tty_close,
1867         .write = isdn_tty_write,
1868         .flush_chars = isdn_tty_flush_chars,
1869         .write_room = isdn_tty_write_room,
1870         .chars_in_buffer = isdn_tty_chars_in_buffer,
1871         .flush_buffer = isdn_tty_flush_buffer,
1872         .ioctl = isdn_tty_ioctl,
1873         .throttle = isdn_tty_throttle,
1874         .unthrottle = isdn_tty_unthrottle,
1875         .set_termios = isdn_tty_set_termios,
1876         .hangup = isdn_tty_hangup,
1877         .tiocmget = isdn_tty_tiocmget,
1878         .tiocmset = isdn_tty_tiocmset,
1879 };
1880
1881 int
1882 isdn_tty_modem_init(void)
1883 {
1884         isdn_modem_t    *m;
1885         int             i, retval;
1886         modem_info      *info;
1887
1888         m = &dev->mdm;
1889         m->tty_modem = alloc_tty_driver(ISDN_MAX_CHANNELS);
1890         if (!m->tty_modem)
1891                 return -ENOMEM;
1892         m->tty_modem->name = "ttyI";
1893         m->tty_modem->devfs_name = "isdn/ttyI";
1894         m->tty_modem->major = ISDN_TTY_MAJOR;
1895         m->tty_modem->minor_start = 0;
1896         m->tty_modem->type = TTY_DRIVER_TYPE_SERIAL;
1897         m->tty_modem->subtype = SERIAL_TYPE_NORMAL;
1898         m->tty_modem->init_termios = tty_std_termios;
1899         m->tty_modem->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1900         m->tty_modem->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
1901         m->tty_modem->driver_name = "isdn_tty";
1902         tty_set_operations(m->tty_modem, &modem_ops);
1903         retval = tty_register_driver(m->tty_modem);
1904         if (retval) {
1905                 printk(KERN_WARNING "isdn_tty: Couldn't register modem-device\n");
1906                 goto err;
1907         }
1908         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1909                 info = &m->info[i];
1910 #ifdef CONFIG_ISDN_TTY_FAX
1911                 if (!(info->fax = kmalloc(sizeof(T30_s), GFP_KERNEL))) {
1912                         printk(KERN_ERR "Could not allocate fax t30-buffer\n");
1913                         retval = -ENOMEM;
1914                         goto err_unregister;
1915                 }
1916 #endif
1917 #ifdef MODULE
1918                 info->owner = THIS_MODULE;
1919 #endif
1920                 spin_lock_init(&info->readlock);
1921                 init_MUTEX(&info->write_sem);
1922                 sprintf(info->last_cause, "0000");
1923                 sprintf(info->last_num, "none");
1924                 info->last_dir = 0;
1925                 info->last_lhup = 1;
1926                 info->last_l2 = -1;
1927                 info->last_si = 0;
1928                 isdn_tty_reset_profile(&info->emu);
1929                 isdn_tty_modem_reset_regs(info, 1);
1930                 info->magic = ISDN_ASYNC_MAGIC;
1931                 info->line = i;
1932                 info->tty = NULL;
1933                 info->x_char = 0;
1934                 info->count = 0;
1935                 info->blocked_open = 0;
1936                 init_waitqueue_head(&info->open_wait);
1937                 init_waitqueue_head(&info->close_wait);
1938                 info->isdn_driver = -1;
1939                 info->isdn_channel = -1;
1940                 info->drv_index = -1;
1941                 info->xmit_size = ISDN_SERIAL_XMIT_SIZE;
1942                 init_timer(&info->nc_timer);
1943                 info->nc_timer.function = isdn_tty_modem_do_ncarrier;
1944                 info->nc_timer.data = (unsigned long) info;
1945                 skb_queue_head_init(&info->xmit_queue);
1946 #ifdef CONFIG_ISDN_AUDIO
1947                 skb_queue_head_init(&info->dtmf_queue);
1948 #endif
1949                 if (!(info->xmit_buf = kmalloc(ISDN_SERIAL_XMIT_MAX + 5, GFP_KERNEL))) {
1950                         printk(KERN_ERR "Could not allocate modem xmit-buffer\n");
1951                         retval = -ENOMEM;
1952                         goto err_unregister;
1953                 }
1954                 /* Make room for T.70 header */
1955                 info->xmit_buf += 4;
1956         }
1957         return 0;
1958 err_unregister:
1959         for (i--; i >= 0; i--) {
1960                 info = &m->info[i];
1961 #ifdef CONFIG_ISDN_TTY_FAX
1962                 kfree(info->fax);
1963 #endif
1964                 kfree(info->xmit_buf - 4);
1965         }
1966         tty_unregister_driver(m->tty_modem);
1967  err:
1968         put_tty_driver(m->tty_modem);
1969         m->tty_modem = NULL;
1970         return retval;
1971 }
1972
1973 void
1974 isdn_tty_exit(void)
1975 {
1976         modem_info *info;
1977         int i;
1978
1979         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1980                 info = &dev->mdm.info[i];
1981                 isdn_tty_cleanup_xmit(info);
1982 #ifdef CONFIG_ISDN_TTY_FAX
1983                 kfree(info->fax);
1984 #endif
1985                 kfree(info->xmit_buf - 4);
1986         }
1987         tty_unregister_driver(dev->mdm.tty_modem);
1988         put_tty_driver(dev->mdm.tty_modem);
1989         dev->mdm.tty_modem = NULL;
1990 }
1991
1992
1993 /*
1994  * isdn_tty_match_icall(char *MSN, atemu *tty_emulator, int dev_idx)
1995  *      match the MSN against the MSNs (glob patterns) defined for tty_emulator,
1996  *      and return 0 for match, 1 for no match, 2 if MSN could match if longer.
1997  */
1998
1999 static int
2000 isdn_tty_match_icall(char *cid, atemu *emu, int di)
2001 {
2002 #ifdef ISDN_DEBUG_MODEM_ICALL
2003         printk(KERN_DEBUG "m_fi: msn=%s lmsn=%s mmsn=%s mreg[SI1]=%d mreg[SI2]=%d\n",
2004                emu->msn, emu->lmsn, isdn_map_eaz2msn(emu->msn, di),
2005                emu->mdmreg[REG_SI1], emu->mdmreg[REG_SI2]);
2006 #endif
2007         if (strlen(emu->lmsn)) {
2008                 char *p = emu->lmsn;
2009                 char *q;
2010                 int  tmp;
2011                 int  ret = 0;
2012
2013                 while (1) {
2014                         if ((q = strchr(p, ';')))
2015                                 *q = '\0';
2016                         if ((tmp = isdn_msncmp(cid, isdn_map_eaz2msn(p, di))) > ret)
2017                                 ret = tmp;
2018 #ifdef ISDN_DEBUG_MODEM_ICALL
2019                         printk(KERN_DEBUG "m_fi: lmsnX=%s mmsn=%s -> tmp=%d\n",
2020                                p, isdn_map_eaz2msn(emu->msn, di), tmp);
2021 #endif
2022                         if (q) {
2023                                 *q = ';';
2024                                 p = q;
2025                                 p++;
2026                         }
2027                         if (!tmp)
2028                                 return 0;
2029                         if (!q)
2030                                 break;
2031                 }
2032                 return ret;
2033         } else {
2034                 int tmp;
2035                 tmp = isdn_msncmp(cid, isdn_map_eaz2msn(emu->msn, di));
2036 #ifdef ISDN_DEBUG_MODEM_ICALL
2037                         printk(KERN_DEBUG "m_fi: mmsn=%s -> tmp=%d\n",
2038                                isdn_map_eaz2msn(emu->msn, di), tmp);
2039 #endif
2040                 return tmp;
2041         }
2042 }
2043
2044 /*
2045  * An incoming call-request has arrived.
2046  * Search the tty-devices for an appropriate device and bind
2047  * it to the ISDN-Channel.
2048  * Return:
2049  *
2050  *  0 = No matching device found.
2051  *  1 = A matching device found.
2052  *  3 = No match found, but eventually would match, if
2053  *      CID is longer.
2054  */
2055 int
2056 isdn_tty_find_icall(int di, int ch, setup_parm *setup)
2057 {
2058         char *eaz;
2059         int i;
2060         int wret;
2061         int idx;
2062         int si1;
2063         int si2;
2064         char *nr;
2065         ulong flags;
2066
2067         if (!setup->phone[0]) {
2068                 nr = "0";
2069                 printk(KERN_INFO "isdn_tty: Incoming call without OAD, assuming '0'\n");
2070         } else
2071                 nr = setup->phone;
2072         si1 = (int) setup->si1;
2073         si2 = (int) setup->si2;
2074         if (!setup->eazmsn[0]) {
2075                 printk(KERN_WARNING "isdn_tty: Incoming call without CPN, assuming '0'\n");
2076                 eaz = "0";
2077         } else
2078                 eaz = setup->eazmsn;
2079 #ifdef ISDN_DEBUG_MODEM_ICALL
2080         printk(KERN_DEBUG "m_fi: eaz=%s si1=%d si2=%d\n", eaz, si1, si2);
2081 #endif
2082         wret = 0;
2083         spin_lock_irqsave(&dev->lock, flags);
2084         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
2085                 modem_info *info = &dev->mdm.info[i];
2086
2087                 if (info->count == 0)
2088                     continue;
2089                 if ((info->emu.mdmreg[REG_SI1] & si2bit[si1]) &&  /* SI1 is matching */
2090                     (info->emu.mdmreg[REG_SI2] == si2)) {         /* SI2 is matching */
2091                         idx = isdn_dc2minor(di, ch);
2092 #ifdef ISDN_DEBUG_MODEM_ICALL
2093                         printk(KERN_DEBUG "m_fi: match1 wret=%d\n", wret);
2094                         printk(KERN_DEBUG "m_fi: idx=%d flags=%08lx drv=%d ch=%d usg=%d\n", idx,
2095                                info->flags, info->isdn_driver, info->isdn_channel,
2096                                dev->usage[idx]);
2097 #endif
2098                         if (
2099 #ifndef FIX_FILE_TRANSFER
2100                                 (info->flags & ISDN_ASYNC_NORMAL_ACTIVE) &&
2101 #endif
2102                                 (info->isdn_driver == -1) &&
2103                                 (info->isdn_channel == -1) &&
2104                                 (USG_NONE(dev->usage[idx]))) {
2105                                 int matchret;
2106
2107                                 if ((matchret = isdn_tty_match_icall(eaz, &info->emu, di)) > wret)
2108                                         wret = matchret;
2109                                 if (!matchret) {                  /* EAZ is matching */
2110                                         info->isdn_driver = di;
2111                                         info->isdn_channel = ch;
2112                                         info->drv_index = idx;
2113                                         dev->m_idx[idx] = info->line;
2114                                         dev->usage[idx] &= ISDN_USAGE_EXCLUSIVE;
2115                                         dev->usage[idx] |= isdn_calc_usage(si1, info->emu.mdmreg[REG_L2PROT]);
2116                                         strcpy(dev->num[idx], nr);
2117                                         strcpy(info->emu.cpn, eaz);
2118                                         info->emu.mdmreg[REG_SI1I] = si2bit[si1];
2119                                         info->emu.mdmreg[REG_PLAN] = setup->plan;
2120                                         info->emu.mdmreg[REG_SCREEN] = setup->screen;
2121                                         isdn_info_update();
2122                                         spin_unlock_irqrestore(&dev->lock, flags);
2123                                         printk(KERN_INFO "isdn_tty: call from %s, -> RING on ttyI%d\n", nr,
2124                                                info->line);
2125                                         info->msr |= UART_MSR_RI;
2126                                         isdn_tty_modem_result(RESULT_RING, info);
2127                                         isdn_timer_ctrl(ISDN_TIMER_MODEMRING, 1);
2128                                         return 1;
2129                                 }
2130                         }
2131                 }
2132         }
2133         spin_unlock_irqrestore(&dev->lock, flags);
2134         printk(KERN_INFO "isdn_tty: call from %s -> %s %s\n", nr, eaz,
2135                ((dev->drv[di]->flags & DRV_FLAG_REJBUS) && (wret != 2))? "rejected" : "ignored");
2136         return (wret == 2)?3:0;
2137 }
2138
2139 #define TTY_IS_ACTIVE(info) \
2140         (info->flags & (ISDN_ASYNC_NORMAL_ACTIVE | ISDN_ASYNC_CALLOUT_ACTIVE))
2141
2142 int
2143 isdn_tty_stat_callback(int i, isdn_ctrl *c)
2144 {
2145         int mi;
2146         modem_info *info;
2147         char *e;
2148
2149         if (i < 0)
2150                 return 0;
2151         if ((mi = dev->m_idx[i]) >= 0) {
2152                 info = &dev->mdm.info[mi];
2153                 switch (c->command) {
2154                         case ISDN_STAT_CINF:
2155                                 printk(KERN_DEBUG "CHARGEINFO on ttyI%d: %ld %s\n", info->line, c->arg, c->parm.num);
2156                                 info->emu.charge = (unsigned) simple_strtoul(c->parm.num, &e, 10);
2157                                 if (e == (char *)c->parm.num)
2158                                         info->emu.charge = 0;
2159
2160                                 break;
2161                         case ISDN_STAT_BSENT:
2162 #ifdef ISDN_TTY_STAT_DEBUG
2163                                 printk(KERN_DEBUG "tty_STAT_BSENT ttyI%d\n", info->line);
2164 #endif
2165                                 if ((info->isdn_driver == c->driver) &&
2166                                     (info->isdn_channel == c->arg)) {
2167                                         info->msr |= UART_MSR_CTS;
2168                                         if (info->send_outstanding)
2169                                                 if (!(--info->send_outstanding))
2170                                                         info->lsr |= UART_LSR_TEMT;
2171                                         isdn_tty_tint(info);
2172                                         return 1;
2173                                 }
2174                                 break;
2175                         case ISDN_STAT_CAUSE:
2176 #ifdef ISDN_TTY_STAT_DEBUG
2177                                 printk(KERN_DEBUG "tty_STAT_CAUSE ttyI%d\n", info->line);
2178 #endif
2179                                 /* Signal cause to tty-device */
2180                                 strncpy(info->last_cause, c->parm.num, 5);
2181                                 return 1;
2182                         case ISDN_STAT_DISPLAY:
2183 #ifdef ISDN_TTY_STAT_DEBUG
2184                                 printk(KERN_DEBUG "tty_STAT_DISPLAY ttyI%d\n", info->line);
2185 #endif
2186                                 /* Signal display to tty-device */
2187                                 if ((info->emu.mdmreg[REG_DISPLAY] & BIT_DISPLAY) &&
2188                                         !(info->emu.mdmreg[REG_RESPNUM] & BIT_RESPNUM)) {
2189                                   isdn_tty_at_cout("\r\n", info);
2190                                   isdn_tty_at_cout("DISPLAY: ", info);
2191                                   isdn_tty_at_cout(c->parm.display, info);
2192                                   isdn_tty_at_cout("\r\n", info);
2193                                 }
2194                                 return 1;
2195                         case ISDN_STAT_DCONN:
2196 #ifdef ISDN_TTY_STAT_DEBUG
2197                                 printk(KERN_DEBUG "tty_STAT_DCONN ttyI%d\n", info->line);
2198 #endif
2199                                 if (TTY_IS_ACTIVE(info)) {
2200                                         if (info->dialing == 1) {
2201                                                 info->dialing = 2;
2202                                                 return 1;
2203                                         }
2204                                 }
2205                                 break;
2206                         case ISDN_STAT_DHUP:
2207 #ifdef ISDN_TTY_STAT_DEBUG
2208                                 printk(KERN_DEBUG "tty_STAT_DHUP ttyI%d\n", info->line);
2209 #endif
2210                                 if (TTY_IS_ACTIVE(info)) {
2211                                         if (info->dialing == 1)
2212                                                 isdn_tty_modem_result(RESULT_BUSY, info);
2213                                         if (info->dialing > 1)
2214                                                 isdn_tty_modem_result(RESULT_NO_CARRIER, info);
2215                                         info->dialing = 0;
2216 #ifdef ISDN_DEBUG_MODEM_HUP
2217                                         printk(KERN_DEBUG "Mhup in ISDN_STAT_DHUP\n");
2218 #endif
2219                                         isdn_tty_modem_hup(info, 0);
2220                                         return 1;
2221                                 }
2222                                 break;
2223                         case ISDN_STAT_BCONN:
2224 #ifdef ISDN_TTY_STAT_DEBUG
2225                                 printk(KERN_DEBUG "tty_STAT_BCONN ttyI%d\n", info->line);
2226 #endif
2227                                 /* Wake up any processes waiting
2228                                  * for incoming call of this device when
2229                                  * DCD follow the state of incoming carrier
2230                                  */
2231                                 if (info->blocked_open &&
2232                                    (info->emu.mdmreg[REG_DCD] & BIT_DCD)) {
2233                                         wake_up_interruptible(&info->open_wait);
2234                                 }
2235
2236                                 /* Schedule CONNECT-Message to any tty
2237                                  * waiting for it and
2238                                  * set DCD-bit of its modem-status.
2239                                  */
2240                                 if (TTY_IS_ACTIVE(info) ||
2241                                     (info->blocked_open && (info->emu.mdmreg[REG_DCD] & BIT_DCD))) {
2242                                         info->msr |= UART_MSR_DCD;
2243                                         info->emu.charge = 0;
2244                                         if (info->dialing & 0xf)
2245                                                 info->last_dir = 1;
2246                                         else
2247                                                 info->last_dir = 0;
2248                                         info->dialing = 0;
2249                                         info->rcvsched = 1;
2250                                         if (USG_MODEM(dev->usage[i])) {
2251                                                 if (info->emu.mdmreg[REG_L2PROT] == ISDN_PROTO_L2_MODEM) {
2252                                                         strcpy(info->emu.connmsg, c->parm.num);
2253                                                         isdn_tty_modem_result(RESULT_CONNECT, info);
2254                                                 } else
2255                                                         isdn_tty_modem_result(RESULT_CONNECT64000, info);
2256                                         }
2257                                         if (USG_VOICE(dev->usage[i]))
2258                                                 isdn_tty_modem_result(RESULT_VCON, info);
2259                                         return 1;
2260                                 }
2261                                 break;
2262                         case ISDN_STAT_BHUP:
2263 #ifdef ISDN_TTY_STAT_DEBUG
2264                                 printk(KERN_DEBUG "tty_STAT_BHUP ttyI%d\n", info->line);
2265 #endif
2266                                 if (TTY_IS_ACTIVE(info)) {
2267 #ifdef ISDN_DEBUG_MODEM_HUP
2268                                         printk(KERN_DEBUG "Mhup in ISDN_STAT_BHUP\n");
2269 #endif
2270                                         isdn_tty_modem_hup(info, 0);
2271                                         return 1;
2272                                 }
2273                                 break;
2274                         case ISDN_STAT_NODCH:
2275 #ifdef ISDN_TTY_STAT_DEBUG
2276                                 printk(KERN_DEBUG "tty_STAT_NODCH ttyI%d\n", info->line);
2277 #endif
2278                                 if (TTY_IS_ACTIVE(info)) {
2279                                         if (info->dialing) {
2280                                                 info->dialing = 0;
2281                                                 info->last_l2 = -1;
2282                                                 info->last_si = 0;
2283                                                 sprintf(info->last_cause, "0000");
2284                                                 isdn_tty_modem_result(RESULT_NO_DIALTONE, info);
2285                                         }
2286                                         isdn_tty_modem_hup(info, 0);
2287                                         return 1;
2288                                 }
2289                                 break;
2290                         case ISDN_STAT_UNLOAD:
2291 #ifdef ISDN_TTY_STAT_DEBUG
2292                                 printk(KERN_DEBUG "tty_STAT_UNLOAD ttyI%d\n", info->line);
2293 #endif
2294                                 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
2295                                         info = &dev->mdm.info[i];
2296                                         if (info->isdn_driver == c->driver) {
2297                                                 if (info->online)
2298                                                         isdn_tty_modem_hup(info, 1);
2299                                         }
2300                                 }
2301                                 return 1;
2302 #ifdef CONFIG_ISDN_TTY_FAX
2303                         case ISDN_STAT_FAXIND:
2304                                 if (TTY_IS_ACTIVE(info)) {
2305                                         isdn_tty_fax_command(info, c);
2306                                 }
2307                                 break;
2308 #endif
2309 #ifdef CONFIG_ISDN_AUDIO
2310                         case ISDN_STAT_AUDIO:
2311                                 if (TTY_IS_ACTIVE(info)) {
2312                                         switch(c->parm.num[0]) {
2313                                                 case ISDN_AUDIO_DTMF:
2314                                                         if (info->vonline) {
2315                                                                 isdn_audio_put_dle_code(info,
2316                                                                         c->parm.num[1]);
2317                                                         }
2318                                                         break;
2319                                         }
2320                                 }
2321                                 break;
2322 #endif
2323                 }
2324         }
2325         return 0;
2326 }
2327
2328 /*********************************************************************
2329  Modem-Emulator-Routines
2330  *********************************************************************/
2331
2332 #define cmdchar(c) ((c>=' ')&&(c<=0x7f))
2333
2334 /*
2335  * Put a message from the AT-emulator into receive-buffer of tty,
2336  * convert CR, LF, and BS to values in modem-registers 3, 4 and 5.
2337  */
2338 void
2339 isdn_tty_at_cout(char *msg, modem_info * info)
2340 {
2341         struct tty_struct *tty;
2342         atemu *m = &info->emu;
2343         char *p;
2344         char c;
2345         u_long flags;
2346         struct sk_buff *skb = NULL;
2347         char *sp = NULL;
2348         int l = strlen(msg);
2349
2350         if (!msg) {
2351                 printk(KERN_WARNING "isdn_tty: Null-Message in isdn_tty_at_cout\n");
2352                 return;
2353         }
2354         spin_lock_irqsave(&info->readlock, flags);
2355         tty = info->tty;
2356         if ((info->flags & ISDN_ASYNC_CLOSING) || (!tty)) {
2357                 spin_unlock_irqrestore(&info->readlock, flags);
2358                 return;
2359         }
2360
2361         /* use queue instead of direct, if online and */
2362         /* data is in queue or buffer is full */
2363         if (info->online && ((tty_buffer_request_room(tty, l) < l) ||
2364             !skb_queue_empty(&dev->drv[info->isdn_driver]->rpqueue[info->isdn_channel]))) {
2365                 skb = alloc_skb(l, GFP_ATOMIC);
2366                 if (!skb) {
2367                         spin_unlock_irqrestore(&info->readlock, flags);
2368                         return;
2369                 }
2370                 sp = skb_put(skb, l);
2371 #ifdef CONFIG_ISDN_AUDIO
2372                 ISDN_AUDIO_SKB_DLECOUNT(skb) = 0;
2373                 ISDN_AUDIO_SKB_LOCK(skb) = 0;
2374 #endif
2375         }
2376
2377         for (p = msg; *p; p++) {
2378                 switch (*p) {
2379                         case '\r':
2380                                 c = m->mdmreg[REG_CR];
2381                                 break;
2382                         case '\n':
2383                                 c = m->mdmreg[REG_LF];
2384                                 break;
2385                         case '\b':
2386                                 c = m->mdmreg[REG_BS];
2387                                 break;
2388                         default:
2389                                 c = *p;
2390                 }
2391                 if (skb) {
2392                         *sp++ = c;
2393                 } else {
2394                         if(tty_insert_flip_char(tty, c, TTY_NORMAL) == 0)
2395                                 break;
2396                 }
2397         }
2398         if (skb) {
2399                 __skb_queue_tail(&dev->drv[info->isdn_driver]->rpqueue[info->isdn_channel], skb);
2400                 dev->drv[info->isdn_driver]->rcvcount[info->isdn_channel] += skb->len;
2401                 spin_unlock_irqrestore(&info->readlock, flags);
2402                 /* Schedule dequeuing */
2403                 if (dev->modempoll && info->rcvsched)
2404                         isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 1);
2405
2406         } else {
2407                 spin_unlock_irqrestore(&info->readlock, flags);
2408                 tty_flip_buffer_push(tty);
2409         }
2410 }
2411
2412 /*
2413  * Perform ATH Hangup
2414  */
2415 static void
2416 isdn_tty_on_hook(modem_info * info)
2417 {
2418         if (info->isdn_channel >= 0) {
2419 #ifdef ISDN_DEBUG_MODEM_HUP
2420                 printk(KERN_DEBUG "Mhup in isdn_tty_on_hook\n");
2421 #endif
2422                 isdn_tty_modem_hup(info, 1);
2423         }
2424 }
2425
2426 static void
2427 isdn_tty_off_hook(void)
2428 {
2429         printk(KERN_DEBUG "isdn_tty_off_hook\n");
2430 }
2431
2432 #define PLUSWAIT1 (HZ/2)        /* 0.5 sec. */
2433 #define PLUSWAIT2 (HZ*3/2)      /* 1.5 sec */
2434
2435 /*
2436  * Check Buffer for Modem-escape-sequence, activate timer-callback to
2437  * isdn_tty_modem_escape() if sequence found.
2438  *
2439  * Parameters:
2440  *   p          pointer to databuffer
2441  *   plus       escape-character
2442  *   count      length of buffer
2443  *   pluscount  count of valid escape-characters so far
2444  *   lastplus   timestamp of last character
2445  */
2446 static void
2447 isdn_tty_check_esc(const u_char * p, u_char plus, int count, int *pluscount,
2448                    u_long *lastplus)
2449 {
2450         if (plus > 127)
2451                 return;
2452         if (count > 3) {
2453                 p += count - 3;
2454                 count = 3;
2455                 *pluscount = 0;
2456         }
2457         while (count > 0) {
2458                 if (*(p++) == plus) {
2459                         if ((*pluscount)++) {
2460                                 /* Time since last '+' > 0.5 sec. ? */
2461                                 if (time_after(jiffies, *lastplus + PLUSWAIT1))
2462                                         *pluscount = 1;
2463                         } else {
2464                                 /* Time since last non-'+' < 1.5 sec. ? */
2465                                 if (time_before(jiffies, *lastplus + PLUSWAIT2))
2466                                         *pluscount = 0;
2467                         }
2468                         if ((*pluscount == 3) && (count == 1))
2469                                 isdn_timer_ctrl(ISDN_TIMER_MODEMPLUS, 1);
2470                         if (*pluscount > 3)
2471                                 *pluscount = 1;
2472                 } else
2473                         *pluscount = 0;
2474                 *lastplus = jiffies;
2475                 count--;
2476         }
2477 }
2478
2479 /*
2480  * Return result of AT-emulator to tty-receive-buffer, depending on
2481  * modem-register 12, bit 0 and 1.
2482  * For CONNECT-messages also switch to online-mode.
2483  * For RING-message handle auto-ATA if register 0 != 0
2484  */
2485
2486 static void
2487 isdn_tty_modem_result(int code, modem_info * info)
2488 {
2489         atemu *m = &info->emu;
2490         static char *msg[] =
2491         {"OK", "CONNECT", "RING", "NO CARRIER", "ERROR",
2492          "CONNECT 64000", "NO DIALTONE", "BUSY", "NO ANSWER",
2493          "RINGING", "NO MSN/EAZ", "VCON", "RUNG"};
2494         char s[ISDN_MSNLEN+10];
2495
2496         switch (code) {
2497                 case RESULT_RING:
2498                         m->mdmreg[REG_RINGCNT]++;
2499                         if (m->mdmreg[REG_RINGCNT] == m->mdmreg[REG_RINGATA])
2500                                 /* Automatically accept incoming call */
2501                                 isdn_tty_cmd_ATA(info);
2502                         break;
2503                 case RESULT_NO_CARRIER:
2504 #ifdef ISDN_DEBUG_MODEM_HUP
2505                         printk(KERN_DEBUG "modem_result: NO CARRIER %d %d\n",
2506                                (info->flags & ISDN_ASYNC_CLOSING),
2507                                (!info->tty));
2508 #endif
2509                         m->mdmreg[REG_RINGCNT] = 0;
2510                         del_timer(&info->nc_timer);
2511                         info->ncarrier = 0;
2512                         if ((info->flags & ISDN_ASYNC_CLOSING) || (!info->tty)) {
2513                                 return;
2514                         }
2515 #ifdef CONFIG_ISDN_AUDIO
2516                         if (info->vonline & 1) {
2517 #ifdef ISDN_DEBUG_MODEM_VOICE
2518                                 printk(KERN_DEBUG "res3: send DLE-ETX on ttyI%d\n",
2519                                        info->line);
2520 #endif
2521                                 /* voice-recording, add DLE-ETX */
2522                                 isdn_tty_at_cout("\020\003", info);
2523                         }
2524                         if (info->vonline & 2) {
2525 #ifdef ISDN_DEBUG_MODEM_VOICE
2526                                 printk(KERN_DEBUG "res3: send DLE-DC4 on ttyI%d\n",
2527                                        info->line);
2528 #endif
2529                                 /* voice-playing, add DLE-DC4 */
2530                                 isdn_tty_at_cout("\020\024", info);
2531                         }
2532 #endif
2533                         break;
2534                 case RESULT_CONNECT:
2535                 case RESULT_CONNECT64000:
2536                         sprintf(info->last_cause, "0000");
2537                         if (!info->online)
2538                                 info->online = 2;
2539                         break;
2540                 case RESULT_VCON:
2541 #ifdef ISDN_DEBUG_MODEM_VOICE
2542                         printk(KERN_DEBUG "res3: send VCON on ttyI%d\n",
2543                                info->line);
2544 #endif
2545                         sprintf(info->last_cause, "0000");
2546                         if (!info->online)
2547                                 info->online = 1;
2548                         break;
2549         } /* switch(code) */
2550
2551         if (m->mdmreg[REG_RESP] & BIT_RESP) {
2552                 /* Show results */
2553                 if (m->mdmreg[REG_RESPNUM] & BIT_RESPNUM) {
2554                         /* Show numeric results only */
2555                         sprintf(s, "\r\n%d\r\n", code);
2556                         isdn_tty_at_cout(s, info);
2557                 } else {
2558                         if (code == RESULT_RING) {
2559                             /* return if "show RUNG" and ringcounter>1 */
2560                             if ((m->mdmreg[REG_RUNG] & BIT_RUNG) &&
2561                                     (m->mdmreg[REG_RINGCNT] > 1))
2562                                                 return;
2563                             /* print CID, _before_ _every_ ring */
2564                             if (!(m->mdmreg[REG_CIDONCE] & BIT_CIDONCE)) {
2565                                     isdn_tty_at_cout("\r\nCALLER NUMBER: ", info);
2566                                     isdn_tty_at_cout(dev->num[info->drv_index], info);
2567                                     if (m->mdmreg[REG_CDN] & BIT_CDN) {
2568                                             isdn_tty_at_cout("\r\nCALLED NUMBER: ", info);
2569                                             isdn_tty_at_cout(info->emu.cpn, info);
2570                                     }
2571                             }
2572                         }
2573                         isdn_tty_at_cout("\r\n", info);
2574                         isdn_tty_at_cout(msg[code], info);
2575                         switch (code) {
2576                                 case RESULT_CONNECT:
2577                                         switch (m->mdmreg[REG_L2PROT]) {
2578                                                 case ISDN_PROTO_L2_MODEM:
2579                                                         isdn_tty_at_cout(" ", info);
2580                                                         isdn_tty_at_cout(m->connmsg, info);
2581                                                         break;
2582                                         }
2583                                         break;
2584                                 case RESULT_RING:
2585                                         /* Append CPN, if enabled */
2586                                         if ((m->mdmreg[REG_CPN] & BIT_CPN)) {
2587                                                 sprintf(s, "/%s", m->cpn);
2588                                                 isdn_tty_at_cout(s, info);
2589                                         }
2590                                         /* Print CID only once, _after_ 1st RING */
2591                                         if ((m->mdmreg[REG_CIDONCE] & BIT_CIDONCE) &&
2592                                             (m->mdmreg[REG_RINGCNT] == 1)) {
2593                                                 isdn_tty_at_cout("\r\n", info);
2594                                                 isdn_tty_at_cout("CALLER NUMBER: ", info);
2595                                                 isdn_tty_at_cout(dev->num[info->drv_index], info);
2596                                                 if (m->mdmreg[REG_CDN] & BIT_CDN) {
2597                                                         isdn_tty_at_cout("\r\nCALLED NUMBER: ", info);
2598                                                         isdn_tty_at_cout(info->emu.cpn, info);
2599                                                 }
2600                                         }
2601                                         break;
2602                                 case RESULT_NO_CARRIER:
2603                                 case RESULT_NO_DIALTONE:
2604                                 case RESULT_BUSY:
2605                                 case RESULT_NO_ANSWER:
2606                                         m->mdmreg[REG_RINGCNT] = 0;
2607                                         /* Append Cause-Message if enabled */
2608                                         if (m->mdmreg[REG_RESPXT] & BIT_RESPXT) {
2609                                                 sprintf(s, "/%s", info->last_cause);
2610                                                 isdn_tty_at_cout(s, info);
2611                                         }
2612                                         break;
2613                                 case RESULT_CONNECT64000:
2614                                         /* Append Protocol to CONNECT message */
2615                                         switch (m->mdmreg[REG_L2PROT]) {
2616                                                 case ISDN_PROTO_L2_X75I:
2617                                                 case ISDN_PROTO_L2_X75UI:
2618                                                 case ISDN_PROTO_L2_X75BUI:
2619                                                         isdn_tty_at_cout("/X.75", info);
2620                                                         break;
2621                                                 case ISDN_PROTO_L2_HDLC:
2622                                                         isdn_tty_at_cout("/HDLC", info);
2623                                                         break;
2624                                                 case ISDN_PROTO_L2_V11096:
2625                                                         isdn_tty_at_cout("/V110/9600", info);
2626                                                         break;
2627                                                 case ISDN_PROTO_L2_V11019:
2628                                                         isdn_tty_at_cout("/V110/19200", info);
2629                                                         break;
2630                                                 case ISDN_PROTO_L2_V11038:
2631                                                         isdn_tty_at_cout("/V110/38400", info);
2632                                                         break;
2633                                         }
2634                                         if (m->mdmreg[REG_T70] & BIT_T70) {
2635                                                 isdn_tty_at_cout("/T.70", info);
2636                                                 if (m->mdmreg[REG_T70] & BIT_T70_EXT)
2637                                                         isdn_tty_at_cout("+", info);
2638                                         }
2639                                         break;
2640                         }
2641                         isdn_tty_at_cout("\r\n", info);
2642                 }
2643         }
2644         if (code == RESULT_NO_CARRIER) {
2645                 if ((info->flags & ISDN_ASYNC_CLOSING) || (!info->tty)) {
2646                         return;
2647                 }
2648                 tty_ldisc_flush(info->tty);
2649                 if ((info->flags & ISDN_ASYNC_CHECK_CD) &&
2650                     (!((info->flags & ISDN_ASYNC_CALLOUT_ACTIVE) &&
2651                        (info->flags & ISDN_ASYNC_CALLOUT_NOHUP)))) {
2652                         tty_hangup(info->tty);
2653                 }
2654         }
2655 }
2656
2657
2658 /*
2659  * Display a modem-register-value.
2660  */
2661 static void
2662 isdn_tty_show_profile(int ridx, modem_info * info)
2663 {
2664         char v[6];
2665
2666         sprintf(v, "\r\n%d", info->emu.mdmreg[ridx]);
2667         isdn_tty_at_cout(v, info);
2668 }
2669
2670 /*
2671  * Get MSN-string from char-pointer, set pointer to end of number
2672  */
2673 static void
2674 isdn_tty_get_msnstr(char *n, char **p)
2675 {
2676         int limit = ISDN_MSNLEN - 1;
2677
2678         while (((*p[0] >= '0' && *p[0] <= '9') ||
2679                 /* Why a comma ??? */
2680                 (*p[0] == ',') || (*p[0] == ':')) &&
2681                 (limit--))
2682                 *n++ = *p[0]++;
2683         *n = '\0';
2684 }
2685
2686 /*
2687  * Get phone-number from modem-commandbuffer
2688  */
2689 static void
2690 isdn_tty_getdial(char *p, char *q,int cnt)
2691 {
2692         int first = 1;
2693         int limit = ISDN_MSNLEN - 1;    /* MUST match the size of interface var to avoid
2694                                         buffer overflow */
2695
2696         while (strchr(" 0123456789,#.*WPTS-", *p) && *p && --cnt>0) {
2697                 if ((*p >= '0' && *p <= '9') || ((*p == 'S') && first) ||
2698                     (*p == '*') || (*p == '#')) {
2699                         *q++ = *p;
2700                         limit--;
2701                 }
2702                 if(!limit)
2703                         break;
2704                 p++;
2705                 first = 0;
2706         }
2707         *q = 0;
2708 }
2709
2710 #define PARSE_ERROR { isdn_tty_modem_result(RESULT_ERROR, info); return; }
2711 #define PARSE_ERROR1 { isdn_tty_modem_result(RESULT_ERROR, info); return 1; }
2712
2713 static void
2714 isdn_tty_report(modem_info * info)
2715 {
2716         atemu *m = &info->emu;
2717         char s[80];
2718
2719         isdn_tty_at_cout("\r\nStatistics of last connection:\r\n\r\n", info);
2720         sprintf(s, "    Remote Number:    %s\r\n", info->last_num);
2721         isdn_tty_at_cout(s, info);
2722         sprintf(s, "    Direction:        %s\r\n", info->last_dir ? "outgoing" : "incoming");
2723         isdn_tty_at_cout(s, info);
2724         isdn_tty_at_cout("    Layer-2 Protocol: ", info);
2725         switch (info->last_l2) {
2726                 case ISDN_PROTO_L2_X75I:
2727                         isdn_tty_at_cout("X.75i", info);
2728                         break;
2729                 case ISDN_PROTO_L2_X75UI:
2730                         isdn_tty_at_cout("X.75ui", info);
2731                         break;
2732                 case ISDN_PROTO_L2_X75BUI:
2733                         isdn_tty_at_cout("X.75bui", info);
2734                         break;
2735                 case ISDN_PROTO_L2_HDLC:
2736                         isdn_tty_at_cout("HDLC", info);
2737                         break;
2738                 case ISDN_PROTO_L2_V11096:
2739                         isdn_tty_at_cout("V.110 9600 Baud", info);
2740                         break;
2741                 case ISDN_PROTO_L2_V11019:
2742                         isdn_tty_at_cout("V.110 19200 Baud", info);
2743                         break;
2744                 case ISDN_PROTO_L2_V11038:
2745                         isdn_tty_at_cout("V.110 38400 Baud", info);
2746                         break;
2747                 case ISDN_PROTO_L2_TRANS:
2748                         isdn_tty_at_cout("transparent", info);
2749                         break;
2750                 case ISDN_PROTO_L2_MODEM:
2751                         isdn_tty_at_cout("modem", info);
2752                         break;
2753                 case ISDN_PROTO_L2_FAX:
2754                         isdn_tty_at_cout("fax", info);
2755                         break;
2756                 default:
2757                         isdn_tty_at_cout("unknown", info);
2758                         break;
2759         }
2760         if (m->mdmreg[REG_T70] & BIT_T70) {
2761                 isdn_tty_at_cout("/T.70", info);
2762                 if (m->mdmreg[REG_T70] & BIT_T70_EXT)
2763                         isdn_tty_at_cout("+", info);
2764         }
2765         isdn_tty_at_cout("\r\n", info);
2766         isdn_tty_at_cout("    Service:          ", info);
2767         switch (info->last_si) {
2768                 case 1:
2769                         isdn_tty_at_cout("audio\r\n", info);
2770                         break;
2771                 case 5:
2772                         isdn_tty_at_cout("btx\r\n", info);
2773                         break;
2774                 case 7:
2775                         isdn_tty_at_cout("data\r\n", info);
2776                         break;
2777                 default:
2778                         sprintf(s, "%d\r\n", info->last_si);
2779                         isdn_tty_at_cout(s, info);
2780                         break;
2781         }
2782         sprintf(s, "    Hangup location:  %s\r\n", info->last_lhup ? "local" : "remote");
2783         isdn_tty_at_cout(s, info);
2784         sprintf(s, "    Last cause:       %s\r\n", info->last_cause);
2785         isdn_tty_at_cout(s, info);
2786 }
2787
2788 /*
2789  * Parse AT&.. commands.
2790  */
2791 static int
2792 isdn_tty_cmd_ATand(char **p, modem_info * info)
2793 {
2794         atemu *m = &info->emu;
2795         int i;
2796         char rb[100];
2797
2798 #define MAXRB (sizeof(rb) - 1)
2799
2800         switch (*p[0]) {
2801                 case 'B':
2802                         /* &B - Set Buffersize */
2803                         p[0]++;
2804                         i = isdn_getnum(p);
2805                         if ((i < 0) || (i > ISDN_SERIAL_XMIT_MAX))
2806                                 PARSE_ERROR1;
2807 #ifdef CONFIG_ISDN_AUDIO
2808                         if ((m->mdmreg[REG_SI1] & 1) && (i > VBUF))
2809                                 PARSE_ERROR1;
2810 #endif
2811                         m->mdmreg[REG_PSIZE] = i / 16;
2812                         info->xmit_size = m->mdmreg[REG_PSIZE] * 16;
2813                         switch (m->mdmreg[REG_L2PROT]) {
2814                                 case ISDN_PROTO_L2_V11096:
2815                                 case ISDN_PROTO_L2_V11019:
2816                                 case ISDN_PROTO_L2_V11038:
2817                                         info->xmit_size /= 10;
2818                         }
2819                         break;
2820                 case 'C':
2821                         /* &C - DCD Status */
2822                         p[0]++;
2823                         switch (isdn_getnum(p)) {
2824                                 case 0:
2825                                         m->mdmreg[REG_DCD] &= ~BIT_DCD;
2826                                         break;
2827                                 case 1:
2828                                         m->mdmreg[REG_DCD] |= BIT_DCD;
2829                                         break;
2830                                 default:
2831                                         PARSE_ERROR1
2832                         }
2833                         break;
2834                 case 'D':
2835                         /* &D - Set DTR-Low-behavior */
2836                         p[0]++;
2837                         switch (isdn_getnum(p)) {
2838                                 case 0:
2839                                         m->mdmreg[REG_DTRHUP] &= ~BIT_DTRHUP;
2840                                         m->mdmreg[REG_DTRR] &= ~BIT_DTRR;
2841                                         break;
2842                                 case 2:
2843                                         m->mdmreg[REG_DTRHUP] |= BIT_DTRHUP;
2844                                         m->mdmreg[REG_DTRR] &= ~BIT_DTRR;
2845                                         break;
2846                                 case 3:
2847                                         m->mdmreg[REG_DTRHUP] |= BIT_DTRHUP;
2848                                         m->mdmreg[REG_DTRR] |= BIT_DTRR;
2849                                         break;
2850                                 default:
2851                                         PARSE_ERROR1
2852                         }
2853                         break;
2854                 case 'E':
2855                         /* &E -Set EAZ/MSN */
2856                         p[0]++;
2857                         isdn_tty_get_msnstr(m->msn, p);
2858                         break;
2859                 case 'F':
2860                         /* &F -Set Factory-Defaults */
2861                         p[0]++;
2862                         if (info->msr & UART_MSR_DCD)
2863                                 PARSE_ERROR1;
2864                         isdn_tty_reset_profile(m);
2865                         isdn_tty_modem_reset_regs(info, 1);
2866                         break;
2867 #ifdef DUMMY_HAYES_AT
2868                 case 'K':
2869                         /* only for be compilant with common scripts */
2870                         /* &K Flowcontrol - no function */
2871                         p[0]++;
2872                         isdn_getnum(p);
2873                         break;
2874 #endif
2875                 case 'L':
2876                         /* &L -Set Numbers to listen on */
2877                         p[0]++;
2878                         i = 0;
2879                         while (*p[0] && (strchr("0123456789,-*[]?;", *p[0])) &&
2880                                (i < ISDN_LMSNLEN))
2881                                 m->lmsn[i++] = *p[0]++;
2882                         m->lmsn[i] = '\0';
2883                         break;
2884                 case 'R':
2885                         /* &R - Set V.110 bitrate adaption */
2886                         p[0]++;
2887                         i = isdn_getnum(p);
2888                         switch (i) {
2889                                 case 0:
2890                                         /* Switch off V.110, back to X.75 */
2891                                         m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
2892                                         m->mdmreg[REG_SI2] = 0;
2893                                         info->xmit_size = m->mdmreg[REG_PSIZE] * 16;
2894                                         break;
2895                                 case 9600:
2896                                         m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_V11096;
2897                                         m->mdmreg[REG_SI2] = 197;
2898                                         info->xmit_size = m->mdmreg[REG_PSIZE] * 16 / 10;
2899                                         break;
2900                                 case 19200:
2901                                         m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_V11019;
2902                                         m->mdmreg[REG_SI2] = 199;
2903                                         info->xmit_size = m->mdmreg[REG_PSIZE] * 16 / 10;
2904                                         break;
2905                                 case 38400:
2906                                         m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_V11038;
2907                                         m->mdmreg[REG_SI2] = 198; /* no existing standard for this */
2908                                         info->xmit_size = m->mdmreg[REG_PSIZE] * 16 / 10;
2909                                         break;
2910                                 default:
2911                                         PARSE_ERROR1;
2912                         }
2913                         /* Switch off T.70 */
2914                         m->mdmreg[REG_T70] &= ~(BIT_T70 | BIT_T70_EXT);
2915                         /* Set Service 7 */
2916                         m->mdmreg[REG_SI1] |= 4;
2917                         break;
2918                 case 'S':
2919                         /* &S - Set Windowsize */
2920                         p[0]++;
2921                         i = isdn_getnum(p);
2922                         if ((i > 0) && (i < 9))
2923                                 m->mdmreg[REG_WSIZE] = i;
2924                         else
2925                                 PARSE_ERROR1;
2926                         break;
2927                 case 'V':
2928                         /* &V - Show registers */
2929                         p[0]++;
2930                         isdn_tty_at_cout("\r\n", info);
2931                         for (i = 0; i < ISDN_MODEM_NUMREG; i++) {
2932                                 sprintf(rb, "S%02d=%03d%s", i,
2933                                         m->mdmreg[i], ((i + 1) % 10) ? " " : "\r\n");
2934                                 isdn_tty_at_cout(rb, info);
2935                         }
2936                         sprintf(rb, "\r\nEAZ/MSN: %.50s\r\n",
2937                                 strlen(m->msn) ? m->msn : "None");
2938                         isdn_tty_at_cout(rb, info);
2939                         if (strlen(m->lmsn)) {
2940                                 isdn_tty_at_cout("\r\nListen: ", info);
2941                                 isdn_tty_at_cout(m->lmsn, info);
2942                                 isdn_tty_at_cout("\r\n", info);
2943                         }
2944                         break;
2945                 case 'W':
2946                         /* &W - Write Profile */
2947                         p[0]++;
2948                         switch (*p[0]) {
2949                                 case '0':
2950                                         p[0]++;
2951                                         modem_write_profile(m);
2952                                         break;
2953                                 default:
2954                                         PARSE_ERROR1;
2955                         }
2956                         break;
2957                 case 'X':
2958                         /* &X - Switch to BTX-Mode and T.70 */
2959                         p[0]++;
2960                         switch (isdn_getnum(p)) {
2961                                 case 0:
2962                                         m->mdmreg[REG_T70] &= ~(BIT_T70 | BIT_T70_EXT);
2963                                         info->xmit_size = m->mdmreg[REG_PSIZE] * 16;
2964                                         break;
2965                                 case 1:
2966                                         m->mdmreg[REG_T70] |= BIT_T70;
2967                                         m->mdmreg[REG_T70] &= ~BIT_T70_EXT;
2968                                         m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
2969                                         info->xmit_size = 112;
2970                                         m->mdmreg[REG_SI1] = 4;
2971                                         m->mdmreg[REG_SI2] = 0;
2972                                         break;
2973                                 case 2:
2974                                         m->mdmreg[REG_T70] |= (BIT_T70 | BIT_T70_EXT);
2975                                         m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
2976                                         info->xmit_size = 112;
2977                                         m->mdmreg[REG_SI1] = 4;
2978                                         m->mdmreg[REG_SI2] = 0;
2979                                         break;
2980                                 default:
2981                                         PARSE_ERROR1;
2982                         }
2983                         break;
2984                 default:
2985                         PARSE_ERROR1;
2986         }
2987         return 0;
2988 }
2989
2990 static int
2991 isdn_tty_check_ats(int mreg, int mval, modem_info * info, atemu * m)
2992 {
2993         /* Some plausibility checks */
2994         switch (mreg) {
2995                 case REG_L2PROT:
2996                         if (mval > ISDN_PROTO_L2_MAX)
2997                                 return 1;
2998                         break;
2999                 case REG_PSIZE:
3000                         if ((mval * 16) > ISDN_SERIAL_XMIT_MAX)
3001                                 return 1;
3002 #ifdef CONFIG_ISDN_AUDIO
3003                         if ((m->mdmreg[REG_SI1] & 1) && (mval > VBUFX))
3004                                 return 1;
3005 #endif
3006                         info->xmit_size = mval * 16;
3007                         switch (m->mdmreg[REG_L2PROT]) {
3008                                 case ISDN_PROTO_L2_V11096:
3009                                 case ISDN_PROTO_L2_V11019:
3010                                 case ISDN_PROTO_L2_V11038:
3011                                         info->xmit_size /= 10;
3012                         }
3013                         break;
3014                 case REG_SI1I:
3015                 case REG_PLAN:
3016                 case REG_SCREEN:
3017                         /* readonly registers */
3018                         return 1;
3019         }
3020         return 0;
3021 }
3022
3023 /*
3024  * Perform ATS command
3025  */
3026 static int
3027 isdn_tty_cmd_ATS(char **p, modem_info * info)
3028 {
3029         atemu *m = &info->emu;
3030         int bitpos;
3031         int mreg;
3032         int mval;
3033         int bval;
3034
3035         mreg = isdn_getnum(p);
3036         if (mreg < 0 || mreg >= ISDN_MODEM_NUMREG)
3037                 PARSE_ERROR1;
3038         switch (*p[0]) {
3039                 case '=':
3040                         p[0]++;
3041                         mval = isdn_getnum(p);
3042                         if (mval < 0 || mval > 255)
3043                                 PARSE_ERROR1;
3044                         if (isdn_tty_check_ats(mreg, mval, info, m))
3045                                 PARSE_ERROR1;
3046                         m->mdmreg[mreg] = mval;
3047                         break;
3048                 case '.':
3049                         /* Set/Clear a single bit */
3050                         p[0]++;
3051                         bitpos = isdn_getnum(p);
3052                         if ((bitpos < 0) || (bitpos > 7))
3053                                 PARSE_ERROR1;
3054                         switch (*p[0]) {
3055                                 case '=':
3056                                         p[0]++;
3057                                         bval = isdn_getnum(p);
3058                                         if (bval < 0 || bval > 1)
3059                                                 PARSE_ERROR1;
3060                                         if (bval)
3061                                                 mval = m->mdmreg[mreg] | (1 << bitpos);
3062                                         else
3063                                                 mval = m->mdmreg[mreg] & ~(1 << bitpos);
3064                                         if (isdn_tty_check_ats(mreg, mval, info, m))
3065                                                 PARSE_ERROR1;
3066                                         m->mdmreg[mreg] = mval;
3067                                         break;
3068                                 case '?':
3069                                         p[0]++;
3070                                         isdn_tty_at_cout("\r\n", info);
3071                                         isdn_tty_at_cout((m->mdmreg[mreg] & (1 << bitpos)) ? "1" : "0",
3072                                                          info);
3073                                         break;
3074                                 default:
3075                                         PARSE_ERROR1;
3076                         }
3077                         break;
3078                 case '?':
3079                         p[0]++;
3080                         isdn_tty_show_profile(mreg, info);
3081                         break;
3082                 default:
3083                         PARSE_ERROR1;
3084                         break;
3085         }
3086         return 0;
3087 }
3088
3089 /*
3090  * Perform ATA command
3091  */
3092 static void
3093 isdn_tty_cmd_ATA(modem_info * info)
3094 {
3095         atemu *m = &info->emu;
3096         isdn_ctrl cmd;
3097         int l2;
3098
3099         if (info->msr & UART_MSR_RI) {
3100                 /* Accept incoming call */
3101                 info->last_dir = 0;
3102                 strcpy(info->last_num, dev->num[info->drv_index]);
3103                 m->mdmreg[REG_RINGCNT] = 0;
3104                 info->msr &= ~UART_MSR_RI;
3105                 l2 = m->mdmreg[REG_L2PROT];
3106 #ifdef CONFIG_ISDN_AUDIO
3107                 /* If more than one bit set in reg18, autoselect Layer2 */
3108                 if ((m->mdmreg[REG_SI1] & m->mdmreg[REG_SI1I]) != m->mdmreg[REG_SI1]) {
3109                         if (m->mdmreg[REG_SI1I] == 1) {
3110                                 if ((l2 != ISDN_PROTO_L2_MODEM) && (l2 != ISDN_PROTO_L2_FAX))
3111                                         l2 = ISDN_PROTO_L2_TRANS;
3112                         } else
3113                                 l2 = ISDN_PROTO_L2_X75I;
3114                 }
3115 #endif
3116                 cmd.driver = info->isdn_driver;
3117                 cmd.command = ISDN_CMD_SETL2;
3118                 cmd.arg = info->isdn_channel + (l2 << 8);
3119                 info->last_l2 = l2;
3120                 isdn_command(&cmd);
3121                 cmd.driver = info->isdn_driver;
3122                 cmd.command = ISDN_CMD_SETL3;
3123                 cmd.arg = info->isdn_channel + (m->mdmreg[REG_L3PROT] << 8);
3124 #ifdef CONFIG_ISDN_TTY_FAX
3125                 if (l2 == ISDN_PROTO_L2_FAX) {
3126                         cmd.parm.fax = info->fax;
3127                         info->fax->direction = ISDN_TTY_FAX_CONN_IN;
3128                 }
3129 #endif
3130                 isdn_command(&cmd);
3131                 cmd.driver = info->isdn_driver;
3132                 cmd.arg = info->isdn_channel;
3133                 cmd.command = ISDN_CMD_ACCEPTD;
3134                 info->dialing = 16;
3135                 info->emu.carrierwait = 0;
3136                 isdn_command(&cmd);
3137                 isdn_timer_ctrl(ISDN_TIMER_CARRIER, 1);
3138         } else
3139                 isdn_tty_modem_result(RESULT_NO_ANSWER, info);
3140 }
3141
3142 #ifdef CONFIG_ISDN_AUDIO
3143 /*
3144  * Parse AT+F.. commands
3145  */
3146 static int
3147 isdn_tty_cmd_PLUSF(char **p, modem_info * info)
3148 {
3149         atemu *m = &info->emu;
3150         char rs[20];
3151
3152         if (!strncmp(p[0], "CLASS", 5)) {
3153                 p[0] += 5;
3154                 switch (*p[0]) {
3155                         case '?':
3156                                 p[0]++;
3157                                 sprintf(rs, "\r\n%d",
3158                                         (m->mdmreg[REG_SI1] & 1) ? 8 : 0);
3159 #ifdef CONFIG_ISDN_TTY_FAX
3160                                 if (TTY_IS_FCLASS2(info))
3161                                                 sprintf(rs, "\r\n2");
3162                                 else if (TTY_IS_FCLASS1(info))
3163                                                 sprintf(rs, "\r\n1");
3164 #endif
3165                                 isdn_tty_at_cout(rs, info);
3166                                 break;
3167                         case '=':
3168                                 p[0]++;
3169                                 switch (*p[0]) {
3170                                         case '0':
3171                                                 p[0]++;
3172                                                 m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
3173                                                 m->mdmreg[REG_L3PROT] = ISDN_PROTO_L3_TRANS;
3174                                                 m->mdmreg[REG_SI1] = 4;
3175                                                 info->xmit_size =
3176                                                     m->mdmreg[REG_PSIZE] * 16;
3177                                                 break;
3178 #ifdef CONFIG_ISDN_TTY_FAX
3179                                         case '1':
3180                                                 p[0]++;
3181                                                 if (!(dev->global_features &
3182                                                         ISDN_FEATURE_L3_FCLASS1))
3183                                                         PARSE_ERROR1;
3184                                                 m->mdmreg[REG_SI1] = 1;
3185                                                 m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_FAX;
3186                                                 m->mdmreg[REG_L3PROT] = ISDN_PROTO_L3_FCLASS1;
3187                                                 info->xmit_size =
3188                                                     m->mdmreg[REG_PSIZE] * 16;
3189                                                 break;
3190                                         case '2':
3191                                                 p[0]++;
3192                                                 if (!(dev->global_features &
3193                                                         ISDN_FEATURE_L3_FCLASS2))
3194                                                         PARSE_ERROR1;
3195                                                 m->mdmreg[REG_SI1] = 1;
3196                                                 m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_FAX;
3197                                                 m->mdmreg[REG_L3PROT] = ISDN_PROTO_L3_FCLASS2;
3198                                                 info->xmit_size =
3199                                                     m->mdmreg[REG_PSIZE] * 16;
3200                                                 break;
3201 #endif
3202                                         case '8':
3203                                                 p[0]++;
3204                                                 /* L2 will change on dialout with si=1 */
3205                                                 m->mdmreg[REG_L2PROT] = ISDN_PROTO_L2_X75I;
3206                                                 m->mdmreg[REG_L3PROT] = ISDN_PROTO_L3_TRANS;
3207                                                 m->mdmreg[REG_SI1] = 5;
3208                                                 info->xmit_size = VBUF;
3209                                                 break;
3210                                         case '?':
3211                                                 p[0]++;
3212                                                 strcpy(rs, "\r\n0,");
3213 #ifdef CONFIG_ISDN_TTY_FAX
3214                                                 if (dev->global_features &
3215                                                         ISDN_FEATURE_L3_FCLASS1)
3216                                                         strcat(rs, "1,");
3217                                                 if (dev->global_features &
3218                                                         ISDN_FEATURE_L3_FCLASS2)
3219                                                         strcat(rs, "2,");
3220 #endif
3221                                                 strcat(rs, "8");
3222                                                 isdn_tty_at_cout(rs, info);
3223                                                 break;
3224                                         default:
3225                                                 PARSE_ERROR1;
3226                                 }
3227                                 break;
3228                         default:
3229                                 PARSE_ERROR1;
3230                 }
3231                 return 0;
3232         }
3233 #ifdef CONFIG_ISDN_TTY_FAX
3234         return (isdn_tty_cmd_PLUSF_FAX(p, info));
3235 #else
3236         PARSE_ERROR1;
3237 #endif
3238 }
3239
3240 /*
3241  * Parse AT+V.. commands
3242  */
3243 static int
3244 isdn_tty_cmd_PLUSV(char **p, modem_info * info)
3245 {
3246         atemu *m = &info->emu;
3247         isdn_ctrl cmd;
3248         static char *vcmd[] =
3249         {"NH", "IP", "LS", "RX", "SD", "SM", "TX", "DD", NULL};
3250         int i;
3251         int par1;
3252         int par2;
3253         char rs[20];
3254
3255         i = 0;
3256         while (vcmd[i]) {
3257                 if (!strncmp(vcmd[i], p[0], 2)) {
3258                         p[0] += 2;
3259                         break;
3260                 }
3261                 i++;
3262         }
3263         switch (i) {
3264                 case 0:
3265                         /* AT+VNH - Auto hangup feature */
3266                         switch (*p[0]) {
3267                                 case '?':
3268                                         p[0]++;
3269                                         isdn_tty_at_cout("\r\n1", info);
3270                                         break;
3271                                 case '=':
3272                                         p[0]++;
3273                                         switch (*p[0]) {
3274                                                 case '1':
3275                                                         p[0]++;
3276                                                         break;
3277                                                 case '?':
3278                                                         p[0]++;
3279                                                         isdn_tty_at_cout("\r\n1", info);
3280                                                         break;
3281                                                 default:
3282                                                         PARSE_ERROR1;
3283                                         }
3284                                         break;
3285                                 default:
3286                                         PARSE_ERROR1;
3287                         }
3288                         break;
3289                 case 1:
3290                         /* AT+VIP - Reset all voice parameters */
3291                         isdn_tty_modem_reset_vpar(m);
3292                         break;
3293                 case 2:
3294                         /* AT+VLS - Select device, accept incoming call */
3295                         switch (*p[0]) {
3296                                 case '?':
3297                                         p[0]++;
3298                                         sprintf(rs, "\r\n%d", m->vpar[0]);
3299                                         isdn_tty_at_cout(rs, info);
3300                                         break;
3301                                 case '=':
3302                                         p[0]++;
3303                                         switch (*p[0]) {
3304                                                 case '0':
3305                                                         p[0]++;
3306                                                         m->vpar[0] = 0;
3307                                                         break;
3308                                                 case '2':
3309                                                         p[0]++;
3310                                                         m->vpar[0] = 2;
3311                                                         break;
3312                                                 case '?':
3313                                                         p[0]++;
3314                                                         isdn_tty_at_cout("\r\n0,2", info);
3315                                                         break;
3316                                                 default:
3317                                                         PARSE_ERROR1;
3318                                         }
3319                                         break;
3320                                 default:
3321                                         PARSE_ERROR1;
3322                         }
3323                         break;
3324                 case 3:
3325                         /* AT+VRX - Start recording */
3326                         if (!m->vpar[0])
3327                                 PARSE_ERROR1;
3328                         if (info->online != 1) {
3329                                 isdn_tty_modem_result(RESULT_NO_ANSWER, info);
3330                                 return 1;
3331                         }
3332                         info->dtmf_state = isdn_audio_dtmf_init(info->dtmf_state);
3333                         if (!info->dtmf_state) {
3334                                 printk(KERN_WARNING "isdn_tty: Couldn't malloc dtmf state\n");
3335                                 PARSE_ERROR1;
3336                         }
3337                         info->silence_state = isdn_audio_silence_init(info->silence_state);
3338                         if (!info->silence_state) {
3339                                 printk(KERN_WARNING "isdn_tty: Couldn't malloc silence state\n");
3340                                 PARSE_ERROR1;
3341                         }
3342                         if (m->vpar[3] < 5) {
3343                                 info->adpcmr = isdn_audio_adpcm_init(info->adpcmr, m->vpar[3]);
3344                                 if (!info->adpcmr) {
3345                                         printk(KERN_WARNING "isdn_tty: Couldn't malloc adpcm state\n");
3346                                         PARSE_ERROR1;
3347                                 }
3348                         }
3349 #ifdef ISDN_DEBUG_AT
3350                         printk(KERN_DEBUG "AT: +VRX\n");
3351 #endif
3352                         info->vonline |= 1;
3353                         isdn_tty_modem_result(RESULT_CONNECT, info);
3354                         return 0;
3355                         break;
3356                 case 4:
3357                         /* AT+VSD - Silence detection */
3358                         switch (*p[0]) {
3359                                 case '?':
3360                                         p[0]++;
3361                                         sprintf(rs, "\r\n<%d>,<%d>",
3362                                                 m->vpar[1],
3363                                                 m->vpar[2]);
3364                                         isdn_tty_at_cout(rs, info);
3365                                         break;
3366                                 case '=':
3367                                         p[0]++;
3368                                         if ((*p[0]>='0') && (*p[0]<='9')) {
3369                                                 par1 = isdn_getnum(p);
3370                                                 if ((par1 < 0) || (par1 > 31))
3371                                                         PARSE_ERROR1;
3372                                                 if (*p[0] != ',')
3373                                                         PARSE_ERROR1;
3374                                                 p[0]++;
3375                                                 par2 = isdn_getnum(p);
3376                                                 if ((par2 < 0) || (par2 > 255))
3377                                                         PARSE_ERROR1;
3378                                                 m->vpar[1] = par1;
3379                                                 m->vpar[2] = par2;
3380                                                 break;
3381                                         } else
3382                                         if (*p[0] == '?') {
3383                                                 p[0]++;
3384                                                 isdn_tty_at_cout("\r\n<0-31>,<0-255>",
3385                                                            info);
3386                                                 break;
3387                                         } else
3388                                         PARSE_ERROR1;
3389                                         break;
3390                                 default:
3391                                         PARSE_ERROR1;
3392                         }
3393                         break;
3394                 case 5:
3395                         /* AT+VSM - Select compression */
3396                         switch (*p[0]) {
3397                                 case '?':
3398                                         p[0]++;
3399                                         sprintf(rs, "\r\n<%d>,<%d><8000>",
3400                                                 m->vpar[3],
3401                                                 m->vpar[1]);
3402                                         isdn_tty_at_cout(rs, info);
3403                                         break;
3404                                 case '=':
3405                                         p[0]++;
3406                                         switch (*p[0]) {
3407                                                 case '2':
3408                                                 case '3':
3409                                                 case '4':
3410                                                 case '5':
3411                                                 case '6':
3412                                                         par1 = isdn_getnum(p);
3413                                                         if ((par1 < 2) || (par1 > 6))
3414                                                                 PARSE_ERROR1;
3415                                                         m->vpar[3] = par1;
3416                                                         break;
3417                                                 case '?':
3418                                                         p[0]++;
3419                                                         isdn_tty_at_cout("\r\n2;ADPCM;2;0;(8000)\r\n",
3420                                                                    info);
3421                                                         isdn_tty_at_cout("3;ADPCM;3;0;(8000)\r\n",
3422                                                                    info);
3423                                                         isdn_tty_at_cout("4;ADPCM;4;0;(8000)\r\n",
3424                                                                    info);
3425                                                         isdn_tty_at_cout("5;ALAW;8;0;(8000)\r\n",
3426                                                                    info);
3427                                                         isdn_tty_at_cout("6;ULAW;8;0;(8000)\r\n",
3428                                                                    info);
3429                                                         break;
3430                                                 default:
3431                                                         PARSE_ERROR1;
3432                                         }
3433                                         break;
3434                                 default:
3435                                         PARSE_ERROR1;
3436                         }
3437                         break;
3438                 case 6:
3439                         /* AT+VTX - Start sending */
3440                         if (!m->vpar[0])
3441                                 PARSE_ERROR1;
3442                         if (info->online != 1) {
3443                                 isdn_tty_modem_result(RESULT_NO_ANSWER, info);
3444                                 return 1;
3445                         }
3446                         info->dtmf_state = isdn_audio_dtmf_init(info->dtmf_state);
3447                         if (!info->dtmf_state) {
3448                                 printk(KERN_WARNING "isdn_tty: Couldn't malloc dtmf state\n");
3449                                 PARSE_ERROR1;
3450                         }
3451                         if (m->vpar[3] < 5) {
3452                                 info->adpcms = isdn_audio_adpcm_init(info->adpcms, m->vpar[3]);
3453                                 if (!info->adpcms) {
3454                                         printk(KERN_WARNING "isdn_tty: Couldn't malloc adpcm state\n");
3455                                         PARSE_ERROR1;
3456                                 }
3457                         }
3458 #ifdef ISDN_DEBUG_AT
3459                         printk(KERN_DEBUG "AT: +VTX\n");
3460 #endif
3461                         m->lastDLE = 0;
3462                         info->vonline |= 2;
3463                         isdn_tty_modem_result(RESULT_CONNECT, info);
3464                         return 0;
3465                         break;
3466                 case 7:
3467                         /* AT+VDD - DTMF detection */
3468                         switch (*p[0]) {
3469                                 case '?':
3470                                         p[0]++;
3471                                         sprintf(rs, "\r\n<%d>,<%d>",
3472                                                 m->vpar[4],
3473                                                 m->vpar[5]);
3474                                         isdn_tty_at_cout(rs, info);
3475                                         break;
3476                                 case '=':
3477                                         p[0]++;
3478                                         if ((*p[0]>='0') && (*p[0]<='9')) {
3479                                                 if (info->online != 1)
3480                                                         PARSE_ERROR1;
3481                                                 par1 = isdn_getnum(p);
3482                                                 if ((par1 < 0) || (par1 > 15))
3483                                                         PARSE_ERROR1;
3484                                                 if (*p[0] != ',')
3485                                                         PARSE_ERROR1;
3486                                                 p[0]++;
3487                                                 par2 = isdn_getnum(p);
3488                                                 if ((par2 < 0) || (par2 > 255))
3489                                                         PARSE_ERROR1;
3490                                                 m->vpar[4] = par1;
3491                                                 m->vpar[5] = par2;
3492                                                 cmd.driver = info->isdn_driver;
3493                                                 cmd.command = ISDN_CMD_AUDIO;
3494                                                 cmd.arg = info->isdn_channel + (ISDN_AUDIO_SETDD << 8);
3495                                                 cmd.parm.num[0] = par1;
3496                                                 cmd.parm.num[1] = par2;
3497                                                 isdn_command(&cmd);
3498                                                 break;
3499                                         } else
3500                                         if (*p[0] == '?') {
3501                                                 p[0]++;
3502                                                 isdn_tty_at_cout("\r\n<0-15>,<0-255>",
3503                                                         info);
3504                                                 break;
3505                                         } else
3506                                         PARSE_ERROR1;
3507                                         break;
3508                                 default:
3509                                         PARSE_ERROR1;
3510                         }
3511                         break;
3512                 default:
3513                         PARSE_ERROR1;
3514         }
3515         return 0;
3516 }
3517 #endif                          /* CONFIG_ISDN_AUDIO */
3518
3519 /*
3520  * Parse and perform an AT-command-line.
3521  */
3522 static void
3523 isdn_tty_parse_at(modem_info * info)
3524 {
3525         atemu *m = &info->emu;
3526         char *p;
3527         char ds[40];
3528
3529 #ifdef ISDN_DEBUG_AT
3530         printk(KERN_DEBUG "AT: '%s'\n", m->mdmcmd);
3531 #endif
3532         for (p = &m->mdmcmd[2]; *p;) {
3533                 switch (*p) {
3534                         case ' ':
3535                                 p++;
3536                                 break;
3537                         case 'A':
3538                                 /* A - Accept incoming call */
3539                                 p++;
3540                                 isdn_tty_cmd_ATA(info);
3541                                 return;
3542                                 break;
3543                         case 'D':
3544                                 /* D - Dial */
3545                                 if (info->msr & UART_MSR_DCD)
3546                                         PARSE_ERROR;
3547                                 if (info->msr & UART_MSR_RI) {
3548                                         isdn_tty_modem_result(RESULT_NO_CARRIER, info);
3549                                         return;
3550                                 }
3551                                 isdn_tty_getdial(++p, ds, sizeof ds);
3552                                 p += strlen(p);
3553                                 if (!strlen(m->msn))
3554                                         isdn_tty_modem_result(RESULT_NO_MSN_EAZ, info);
3555                                 else if (strlen(ds))
3556                                         isdn_tty_dial(ds, info, m);
3557                                 else
3558                                         PARSE_ERROR;
3559                                 return;
3560                         case 'E':
3561                                 /* E - Turn Echo on/off */
3562                                 p++;
3563                                 switch (isdn_getnum(&p)) {
3564                                         case 0:
3565                                                 m->mdmreg[REG_ECHO] &= ~BIT_ECHO;
3566                                                 break;
3567                                         case 1:
3568                                                 m->mdmreg[REG_ECHO] |= BIT_ECHO;
3569                                                 break;
3570                                         default:
3571                                                 PARSE_ERROR;
3572                                 }
3573                                 break;
3574                         case 'H':
3575                                 /* H - On/Off-hook */
3576                                 p++;
3577                                 switch (*p) {
3578                                         case '0':
3579                                                 p++;
3580                                                 isdn_tty_on_hook(info);
3581                                                 break;
3582                                         case '1':
3583                                                 p++;
3584                                                 isdn_tty_off_hook();
3585                                                 break;
3586                                         default:
3587                                                 isdn_tty_on_hook(info);
3588                                                 break;
3589                                 }
3590                                 break;
3591                         case 'I':
3592                                 /* I - Information */
3593                                 p++;
3594                                 isdn_tty_at_cout("\r\nLinux ISDN", info);
3595                                 switch (*p) {
3596                                         case '0':
3597                                         case '1':
3598                                                 p++;
3599                                                 break;
3600                                         case '2':
3601                                                 p++;
3602                                                 isdn_tty_report(info);
3603                                                 break;
3604                                         case '3':
3605                                                 p++;
3606                                                 sprintf(ds, "\r\n%d", info->emu.charge);
3607                                                 isdn_tty_at_cout(ds, info);
3608                                                 break;
3609                                         default:;
3610                                 }
3611                                 break;
3612 #ifdef DUMMY_HAYES_AT
3613                         case 'L':
3614                         case 'M':
3615                                 /* only for be compilant with common scripts */
3616                                 /* no function */
3617                                 p++;
3618                                 isdn_getnum(&p);
3619                                 break;
3620 #endif
3621                         case 'O':
3622                                 /* O - Go online */
3623                                 p++;
3624                                 if (info->msr & UART_MSR_DCD)
3625                                         /* if B-Channel is up */
3626                                         isdn_tty_modem_result((m->mdmreg[REG_L2PROT] == ISDN_PROTO_L2_MODEM) ? RESULT_CONNECT:RESULT_CONNECT64000, info);
3627                                 else
3628                                         isdn_tty_modem_result(RESULT_NO_CARRIER, info);
3629                                 return;
3630                         case 'Q':
3631                                 /* Q - Turn Emulator messages on/off */
3632                                 p++;
3633                                 switch (isdn_getnum(&p)) {
3634                                         case 0:
3635                                                 m->mdmreg[REG_RESP] |= BIT_RESP;
3636                                                 break;
3637                                         case 1:
3638                                                 m->mdmreg[REG_RESP] &= ~BIT_RESP;
3639                                                 break;
3640                                         default:
3641                                                 PARSE_ERROR;
3642                                 }
3643                                 break;
3644                         case 'S':
3645                                 /* S - Set/Get Register */
3646                                 p++;
3647                                 if (isdn_tty_cmd_ATS(&p, info))
3648                                         return;
3649                                 break;
3650                         case 'V':
3651                                 /* V - Numeric or ASCII Emulator-messages */
3652                                 p++;
3653                                 switch (isdn_getnum(&p)) {
3654                                         case 0:
3655                                                 m->mdmreg[REG_RESP] |= BIT_RESPNUM;
3656                                                 break;
3657                                         case 1:
3658                                                 m->mdmreg[REG_RESP] &= ~BIT_RESPNUM;
3659                                                 break;
3660                                         default:
3661                                                 PARSE_ERROR;
3662                                 }
3663                                 break;
3664                         case 'Z':
3665                                 /* Z - Load Registers from Profile */
3666                                 p++;
3667                                 if (info->msr & UART_MSR_DCD) {
3668                                         info->online = 0;
3669                                         isdn_tty_on_hook(info);
3670                                 }
3671                                 isdn_tty_modem_reset_regs(info, 1);
3672                                 break;
3673                         case '+':
3674                                 p++;
3675                                 switch (*p) {
3676 #ifdef CONFIG_ISDN_AUDIO
3677                                         case 'F':
3678                                                 p++;
3679                                                 if (isdn_tty_cmd_PLUSF(&p, info))
3680                                                         return;
3681                                                 break;
3682                                         case 'V':
3683                                                 if ((!(m->mdmreg[REG_SI1] & 1)) ||
3684                                                         (m->mdmreg[REG_L2PROT] == ISDN_PROTO_L2_MODEM))
3685                                                         PARSE_ERROR;
3686                                                 p++;
3687                                                 if (isdn_tty_cmd_PLUSV(&p, info))
3688                                                         return;
3689                                                 break;
3690 #endif                          /* CONFIG_ISDN_AUDIO */
3691                                         case 'S':       /* SUSPEND */
3692                                                 p++;
3693                                                 isdn_tty_get_msnstr(ds, &p);
3694                                                 isdn_tty_suspend(ds, info, m);
3695                                                 break;
3696                                         case 'R':       /* RESUME */
3697                                                 p++;
3698                                                 isdn_tty_get_msnstr(ds, &p);
3699                                                 isdn_tty_resume(ds, info, m);
3700                                                 break;
3701                                         case 'M':       /* MESSAGE */
3702                                                 p++;
3703                                                 isdn_tty_send_msg(info, m, p);
3704                                                 break;
3705                                         default:
3706                                                 PARSE_ERROR;
3707                                 }
3708                                 break;
3709                         case '&':
3710                                 p++;
3711                                 if (isdn_tty_cmd_ATand(&p, info))
3712                                         return;
3713                                 break;
3714                         default:
3715                                 PARSE_ERROR;
3716                 }
3717         }
3718 #ifdef CONFIG_ISDN_AUDIO
3719         if (!info->vonline)
3720 #endif
3721                 isdn_tty_modem_result(RESULT_OK, info);
3722 }
3723
3724 /* Need own toupper() because standard-toupper is not available
3725  * within modules.
3726  */
3727 #define my_toupper(c) (((c>='a')&&(c<='z'))?(c&0xdf):c)
3728
3729 /*
3730  * Perform line-editing of AT-commands
3731  *
3732  * Parameters:
3733  *   p        inputbuffer
3734  *   count    length of buffer
3735  *   channel  index to line (minor-device)
3736  */
3737 static int
3738 isdn_tty_edit_at(const char *p, int count, modem_info * info)
3739 {
3740         atemu *m = &info->emu;
3741         int total = 0;
3742         u_char c;
3743         char eb[2];
3744         int cnt;
3745
3746         for (cnt = count; cnt > 0; p++, cnt--) {
3747                 c = *p;
3748                 total++;
3749                 if (c == m->mdmreg[REG_CR] || c == m->mdmreg[REG_LF]) {
3750                         /* Separator (CR or LF) */
3751                         m->mdmcmd[m->mdmcmdl] = 0;
3752                         if (m->mdmreg[REG_ECHO] & BIT_ECHO) {
3753                                 eb[0] = c;
3754                                 eb[1] = 0;
3755                                 isdn_tty_at_cout(eb, info);
3756                         }
3757                         if ((m->mdmcmdl >= 2) && (!(strncmp(m->mdmcmd, "AT", 2))))
3758                                 isdn_tty_parse_at(info);
3759                         m->mdmcmdl = 0;
3760                         continue;
3761                 }
3762                 if (c == m->mdmreg[REG_BS] && m->mdmreg[REG_BS] < 128) {
3763                         /* Backspace-Function */
3764                         if ((m->mdmcmdl > 2) || (!m->mdmcmdl)) {
3765                                 if (m->mdmcmdl)
3766                                         m->mdmcmdl--;
3767                                 if (m->mdmreg[REG_ECHO] & BIT_ECHO)
3768                                         isdn_tty_at_cout("\b", info);
3769                         }
3770                         continue;
3771                 }
3772                 if (cmdchar(c)) {
3773                         if (m->mdmreg[REG_ECHO] & BIT_ECHO) {
3774                                 eb[0] = c;
3775                                 eb[1] = 0;
3776                                 isdn_tty_at_cout(eb, info);
3777                         }
3778                         if (m->mdmcmdl < 255) {
3779                                 c = my_toupper(c);
3780                                 switch (m->mdmcmdl) {
3781                                         case 1:
3782                                                 if (c == 'T') {
3783                                                         m->mdmcmd[m->mdmcmdl] = c;
3784                                                         m->mdmcmd[++m->mdmcmdl] = 0;
3785                                                         break;
3786                                                 } else
3787                                                         m->mdmcmdl = 0;
3788                                                 /* Fall through, check for 'A' */
3789                                         case 0:
3790                                                 if (c == 'A') {
3791                                                         m->mdmcmd[m->mdmcmdl] = c;
3792                                                         m->mdmcmd[++m->mdmcmdl] = 0;
3793                                                 }
3794                                                 break;
3795                                         default:
3796                                                 m->mdmcmd[m->mdmcmdl] = c;
3797                                                 m->mdmcmd[++m->mdmcmdl] = 0;
3798                                 }
3799                         }
3800                 }
3801         }
3802         return total;
3803 }
3804
3805 /*
3806  * Switch all modem-channels who are online and got a valid
3807  * escape-sequence 1.5 seconds ago, to command-mode.
3808  * This function is called every second via timer-interrupt from within
3809  * timer-dispatcher isdn_timer_function()
3810  */
3811 void
3812 isdn_tty_modem_escape(void)
3813 {
3814         int ton = 0;
3815         int i;
3816         int midx;
3817
3818         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
3819                 if (USG_MODEM(dev->usage[i]))
3820                         if ((midx = dev->m_idx[i]) >= 0) {
3821                                 modem_info *info = &dev->mdm.info[midx];
3822                                 if (info->online) {
3823                                         ton = 1;
3824                                         if ((info->emu.pluscount == 3) &&
3825                                             time_after(jiffies , info->emu.lastplus + PLUSWAIT2)) {
3826                                                 info->emu.pluscount = 0;
3827                                                 info->online = 0;
3828                                                 isdn_tty_modem_result(RESULT_OK, info);
3829                                         }
3830                                 }
3831                         }
3832         isdn_timer_ctrl(ISDN_TIMER_MODEMPLUS, ton);
3833 }
3834
3835 /*
3836  * Put a RING-message to all modem-channels who have the RI-bit set.
3837  * This function is called every second via timer-interrupt from within
3838  * timer-dispatcher isdn_timer_function()
3839  */
3840 void
3841 isdn_tty_modem_ring(void)
3842 {
3843         int ton = 0;
3844         int i;
3845
3846         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
3847                 modem_info *info = &dev->mdm.info[i];
3848                 if (info->msr & UART_MSR_RI) {
3849                         ton = 1;
3850                         isdn_tty_modem_result(RESULT_RING, info);
3851                 }
3852         }
3853         isdn_timer_ctrl(ISDN_TIMER_MODEMRING, ton);
3854 }
3855
3856 /*
3857  * For all online tty's, try sending data to
3858  * the lower levels.
3859  */
3860 void
3861 isdn_tty_modem_xmit(void)
3862 {
3863         int ton = 1;
3864         int i;
3865
3866         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
3867                 modem_info *info = &dev->mdm.info[i];
3868                 if (info->online) {
3869                         ton = 1;
3870                         isdn_tty_senddown(info);
3871                         isdn_tty_tint(info);
3872                 }
3873         }
3874         isdn_timer_ctrl(ISDN_TIMER_MODEMXMIT, ton);
3875 }
3876
3877 /*
3878  * Check all channels if we have a 'no carrier' timeout.
3879  * Timeout value is set by Register S7.
3880  */
3881 void
3882 isdn_tty_carrier_timeout(void)
3883 {
3884         int ton = 0;
3885         int i;
3886
3887         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
3888                 modem_info *info = &dev->mdm.info[i];
3889                 if (info->dialing) {
3890                         if (info->emu.carrierwait++ > info->emu.mdmreg[REG_WAITC]) {
3891                                 info->dialing = 0;
3892                                 isdn_tty_modem_result(RESULT_NO_CARRIER, info);
3893                                 isdn_tty_modem_hup(info, 1);
3894                         }
3895                         else
3896                                 ton = 1;
3897                 }
3898         }
3899         isdn_timer_ctrl(ISDN_TIMER_CARRIER, ton);
3900 }