drivers/isdn/isdnloop/isdnloop.c

   1 /* $Id: isdnloop.c,v 1.11.6.7 2001/11/11 19:54:31 kai Exp $
   2  *
   3  * ISDN low-level module implementing a dummy loop driver.
   4  *
   5  * Copyright 1997 by Fritz Elfert (fritz@isdn4linux.de)
   6  *
   7  * This software may be used and distributed according to the terms
   8  * of the GNU General Public License, incorporated herein by reference.
   9  *
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/init.h>
  15 #include <linux/sched.h>
  16 #include "isdnloop.h"
  17
  18 static char *revision = "$Revision: 1.11.6.7 $";
  19 static char *isdnloop_id = "loop0";
  20
  21 MODULE_DESCRIPTION("ISDN4Linux: Pseudo Driver that simulates an ISDN card");
  22 MODULE_AUTHOR("Fritz Elfert");
  23 MODULE_LICENSE("GPL");
  24 module_param(isdnloop_id, charp, 0);
  25 MODULE_PARM_DESC(isdnloop_id, "ID-String of first card");
  26
  27 static int isdnloop_addcard(char *);
  28
  29 /*
  30  * Free queue completely.
  31  *
  32  * Parameter:
  33  *   card    = pointer to card struct
  34  *   channel = channel number
  35  */
  36 static void
  37 isdnloop_free_queue(isdnloop_card * card, int channel)
  38 {
  39         struct sk_buff_head *queue = &card->bqueue[channel];
  40
  41         skb_queue_purge(queue);
  42         card->sndcount[channel] = 0;
  43 }
  44
  45 /*
  46  * Send B-Channel data to another virtual card.
  47  * This routine is called via timer-callback from isdnloop_pollbchan().
  48  *
  49  * Parameter:
  50  *   card = pointer to card struct.
  51  *   ch   = channel number (0-based)
  52  */
  53 static void
  54 isdnloop_bchan_send(isdnloop_card * card, int ch)
  55 {
  56         isdnloop_card *rcard = card->rcard[ch];
  57         int rch = card->rch[ch], len, ack;
  58         struct sk_buff *skb;
  59         isdn_ctrl cmd;
  60
  61         while (card->sndcount[ch]) {
  62                 if ((skb = skb_dequeue(&card->bqueue[ch]))) {
  63                         len = skb->len;
  64                         card->sndcount[ch] -= len;
  65                         ack = *(skb->head); /* used as scratch area */
  66                         cmd.driver = card->myid;
  67                         cmd.arg = ch;
  68                         if (rcard){
  69                                 rcard->interface.rcvcallb_skb(rcard->myid, rch, skb);
  70                         } else {
  71                                 printk(KERN_WARNING "isdnloop: no rcard, skb dropped\n");
  72                                 dev_kfree_skb(skb);
  73
  74                         };
  75                         cmd.command = ISDN_STAT_BSENT;
  76                         cmd.parm.length = len;
  77                         card->interface.statcallb(&cmd);
  78                 } else
  79                         card->sndcount[ch] = 0;
  80         }
  81 }
  82
  83 /*
  84  * Send/Receive Data to/from the B-Channel.
  85  * This routine is called via timer-callback.
  86  * It schedules itself while any B-Channel is open.
  87  *
  88  * Parameter:
  89  *   data = pointer to card struct, set by kernel timer.data
  90  */
  91 static void
  92 isdnloop_pollbchan(unsigned long data)
  93 {
  94         isdnloop_card *card = (isdnloop_card *) data;
  95         unsigned long flags;
  96
  97         if (card->flags & ISDNLOOP_FLAGS_B1ACTIVE)
  98                 isdnloop_bchan_send(card, 0);
  99         if (card->flags & ISDNLOOP_FLAGS_B2ACTIVE)
 100                 isdnloop_bchan_send(card, 1);
 101         if (card->flags & (ISDNLOOP_FLAGS_B1ACTIVE | ISDNLOOP_FLAGS_B2ACTIVE)) {
 102                 /* schedule b-channel polling again */
 103                 save_flags(flags);
 104                 cli();
 105                 card->rb_timer.expires = jiffies + ISDNLOOP_TIMER_BCREAD;
 106                 add_timer(&card->rb_timer);
 107                 card->flags |= ISDNLOOP_FLAGS_RBTIMER;
 108                 restore_flags(flags);
 109         } else
 110                 card->flags &= ~ISDNLOOP_FLAGS_RBTIMER;
 111 }
 112
 113 /*
 114  * Parse ICN-type setup string and fill fields of setup-struct
 115  * with parsed data.
 116  *
 117  * Parameter:
 118  *   setup = setup string, format: [caller-id],si1,si2,[called-id]
 119  *   cmd   = pointer to struct to be filled.
 120  */
 121 static void
 122 isdnloop_parse_setup(char *setup, isdn_ctrl * cmd)
 123 {
 124         char *t = setup;
 125         char *s = strchr(t, ',');
 126
 127         *s++ = '\0';
 128         strlcpy(cmd->parm.setup.phone, t, sizeof(cmd->parm.setup.phone));
 129         s = strchr(t = s, ',');
 130         *s++ = '\0';
 131         if (!strlen(t))
 132                 cmd->parm.setup.si1 = 0;
 133         else
 134                 cmd->parm.setup.si1 = simple_strtoul(t, NULL, 10);
 135         s = strchr(t = s, ',');
 136         *s++ = '\0';
 137         if (!strlen(t))
 138                 cmd->parm.setup.si2 = 0;
 139         else
 140                 cmd->parm.setup.si2 =
 141                     simple_strtoul(t, NULL, 10);
 142         strlcpy(cmd->parm.setup.eazmsn, s, sizeof(cmd->parm.setup.eazmsn));
 143         cmd->parm.setup.plan = 0;
 144         cmd->parm.setup.screen = 0;
 145 }
 146
 147 typedef struct isdnloop_stat {
 148         char *statstr;
 149         int command;
 150         int action;
 151 } isdnloop_stat;
 152 /* *INDENT-OFF* */
 153 static isdnloop_stat isdnloop_stat_table[] =
 154 {
 155         {"BCON_",          ISDN_STAT_BCONN, 1}, /* B-Channel connected        */
 156         {"BDIS_",          ISDN_STAT_BHUP,  2}, /* B-Channel disconnected     */
 157         {"DCON_",          ISDN_STAT_DCONN, 0}, /* D-Channel connected        */
 158         {"DDIS_",          ISDN_STAT_DHUP,  0}, /* D-Channel disconnected     */
 159         {"DCAL_I",         ISDN_STAT_ICALL, 3}, /* Incoming call dialup-line  */
 160         {"DSCA_I",         ISDN_STAT_ICALL, 3}, /* Incoming call 1TR6-SPV     */
 161         {"FCALL",          ISDN_STAT_ICALL, 4}, /* Leased line connection up  */
 162         {"CIF",            ISDN_STAT_CINF,  5}, /* Charge-info, 1TR6-type     */
 163         {"AOC",            ISDN_STAT_CINF,  6}, /* Charge-info, DSS1-type     */
 164         {"CAU",            ISDN_STAT_CAUSE, 7}, /* Cause code                 */
 165         {"TEI OK",         ISDN_STAT_RUN,   0}, /* Card connected to wallplug */
 166         {"E_L1: ACT FAIL", ISDN_STAT_BHUP,  8}, /* Layer-1 activation failed  */
 167         {"E_L2: DATA LIN", ISDN_STAT_BHUP,  8}, /* Layer-2 data link lost     */
 168         {"E_L1: ACTIVATION FAILED",
 169                            ISDN_STAT_BHUP,  8},         /* Layer-1 activation failed  */
 170         {NULL, 0, -1}
 171 };
 172 /* *INDENT-ON* */
 173
 174
 175 /*
 176  * Parse Status message-strings from virtual card.
 177  * Depending on status, call statcallb for sending messages to upper
 178  * levels. Also set/reset B-Channel active-flags.
 179  *
 180  * Parameter:
 181  *   status  = status string to parse.
 182  *   channel = channel where message comes from.
 183  *   card    = card where message comes from.
 184  */
 185 static void
 186 isdnloop_parse_status(u_char * status, int channel, isdnloop_card * card)
 187 {
 188         isdnloop_stat *s = isdnloop_stat_table;
 189         int action = -1;
 190         isdn_ctrl cmd;
 191
 192         while (s->statstr) {
 193                 if (!strncmp(status, s->statstr, strlen(s->statstr))) {
 194                         cmd.command = s->command;
 195                         action = s->action;
 196                         break;
 197                 }
 198                 s++;
 199         }
 200         if (action == -1)
 201                 return;
 202         cmd.driver = card->myid;
 203         cmd.arg = channel;
 204         switch (action) {
 205                 case 1:
 206                         /* BCON_x */
 207                         card->flags |= (channel) ?
 208                             ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE;
 209                         break;
 210                 case 2:
 211                         /* BDIS_x */
 212                         card->flags &= ~((channel) ?
 213                                          ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE);
 214                         isdnloop_free_queue(card, channel);
 215                         break;
 216                 case 3:
 217                         /* DCAL_I and DSCA_I */
 218                         isdnloop_parse_setup(status + 6, &cmd);
 219                         break;
 220                 case 4:
 221                         /* FCALL */
 222                         sprintf(cmd.parm.setup.phone, "LEASED%d", card->myid);
 223                         sprintf(cmd.parm.setup.eazmsn, "%d", channel + 1);
 224                         cmd.parm.setup.si1 = 7;
 225                         cmd.parm.setup.si2 = 0;
 226                         cmd.parm.setup.plan = 0;
 227                         cmd.parm.setup.screen = 0;
 228                         break;
 229                 case 5:
 230                         /* CIF */
 231                         strlcpy(cmd.parm.num, status + 3, sizeof(cmd.parm.num));
 232                         break;
 233                 case 6:
 234                         /* AOC */
 235                         snprintf(cmd.parm.num, sizeof(cmd.parm.num), "%d",
 236                              (int) simple_strtoul(status + 7, NULL, 16));
 237                         break;
 238                 case 7:
 239                         /* CAU */
 240                         status += 3;
 241                         if (strlen(status) == 4)
 242                                 snprintf(cmd.parm.num, sizeof(cmd.parm.num), "%s%c%c",
 243                                      status + 2, *status, *(status + 1));
 244                         else
 245                                 strlcpy(cmd.parm.num, status + 1, sizeof(cmd.parm.num));
 246                         break;
 247                 case 8:
 248                         /* Misc Errors on L1 and L2 */
 249                         card->flags &= ~ISDNLOOP_FLAGS_B1ACTIVE;
 250                         isdnloop_free_queue(card, 0);
 251                         cmd.arg = 0;
 252                         cmd.driver = card->myid;
 253                         card->interface.statcallb(&cmd);
 254                         cmd.command = ISDN_STAT_DHUP;
 255                         cmd.arg = 0;
 256                         cmd.driver = card->myid;
 257                         card->interface.statcallb(&cmd);
 258                         cmd.command = ISDN_STAT_BHUP;
 259                         card->flags &= ~ISDNLOOP_FLAGS_B2ACTIVE;
 260                         isdnloop_free_queue(card, 1);
 261                         cmd.arg = 1;
 262                         cmd.driver = card->myid;
 263                         card->interface.statcallb(&cmd);
 264                         cmd.command = ISDN_STAT_DHUP;
 265                         cmd.arg = 1;
 266                         cmd.driver = card->myid;
 267                         break;
 268         }
 269         card->interface.statcallb(&cmd);
 270 }
 271
 272 /*
 273  * Store a cwcharacter into ringbuffer for reading from /dev/isdnctrl
 274  *
 275  * Parameter:
 276  *   card = pointer to card struct.
 277  *   c    = char to store.
 278  */
 279 static void
 280 isdnloop_putmsg(isdnloop_card * card, unsigned char c)
 281 {
 282         ulong flags;
 283
 284         save_flags(flags);
 285         cli();
 286         *card->msg_buf_write++ = (c == 0xff) ? '\n' : c;
 287         if (card->msg_buf_write == card->msg_buf_read) {
 288                 if (++card->msg_buf_read > card->msg_buf_end)
 289                         card->msg_buf_read = card->msg_buf;
 290         }
 291         if (card->msg_buf_write > card->msg_buf_end)
 292                 card->msg_buf_write = card->msg_buf;
 293         restore_flags(flags);
 294 }
 295
 296 /*
 297  * Poll a virtual cards message queue.
 298  * If there are new status-replies from the card, copy them to
 299  * ringbuffer for reading on /dev/isdnctrl and call
 300  * isdnloop_parse_status() for processing them. Watch for special
 301  * Firmware bootmessage and parse it, to get the D-Channel protocol.
 302  * If there are B-Channels open, initiate a timer-callback to
 303  * isdnloop_pollbchan().
 304  * This routine is called periodically via timer interrupt.
 305  *
 306  * Parameter:
 307  *   data = pointer to card struct
 308  */
 309 static void
 310 isdnloop_polldchan(unsigned long data)
 311 {
 312         isdnloop_card *card = (isdnloop_card *) data;
 313         struct sk_buff *skb;
 314         int avail;
 315         int left;
 316         u_char c;
 317         int ch;
 318         unsigned long flags;
 319         u_char *p;
 320         isdn_ctrl cmd;
 321
 322         if ((skb = skb_dequeue(&card->dqueue)))
 323                 avail = skb->len;
 324         else
 325                 avail = 0;
 326         for (left = avail; left > 0; left--) {
 327                 c = *skb->data;
 328                 skb_pull(skb, 1);
 329                 isdnloop_putmsg(card, c);
 330                 card->imsg[card->iptr] = c;
 331                 if (card->iptr < 59)
 332                         card->iptr++;
 333                 if (!skb->len) {
 334                         avail++;
 335                         isdnloop_putmsg(card, '\n');
 336                         card->imsg[card->iptr] = 0;
 337                         card->iptr = 0;
 338                         if (card->imsg[0] == '0' && card->imsg[1] >= '0' &&
 339                           card->imsg[1] <= '2' && card->imsg[2] == ';') {
 340                                 ch = (card->imsg[1] - '0') - 1;
 341                                 p = &card->imsg[3];
 342                                 isdnloop_parse_status(p, ch, card);
 343                         } else {
 344                                 p = card->imsg;
 345                                 if (!strncmp(p, "DRV1.", 5)) {
 346                                         printk(KERN_INFO "isdnloop: (%s) %s\n", CID, p);
 347                                         if (!strncmp(p + 7, "TC", 2)) {
 348                                                 card->ptype = ISDN_PTYPE_1TR6;
 349                                                 card->interface.features |= ISDN_FEATURE_P_1TR6;
 350                                                 printk(KERN_INFO
 351                                                        "isdnloop: (%s) 1TR6-Protocol loaded and running\n", CID);
 352                                         }
 353                                         if (!strncmp(p + 7, "EC", 2)) {
 354                                                 card->ptype = ISDN_PTYPE_EURO;
 355                                                 card->interface.features |= ISDN_FEATURE_P_EURO;
 356                                                 printk(KERN_INFO
 357                                                        "isdnloop: (%s) Euro-Protocol loaded and running\n", CID);
 358                                         }
 359                                         continue;
 360
 361                                 }
 362                         }
 363                 }
 364         }
 365         if (avail) {
 366                 cmd.command = ISDN_STAT_STAVAIL;
 367                 cmd.driver = card->myid;
 368                 cmd.arg = avail;
 369                 card->interface.statcallb(&cmd);
 370         }
 371         if (card->flags & (ISDNLOOP_FLAGS_B1ACTIVE | ISDNLOOP_FLAGS_B2ACTIVE))
 372                 if (!(card->flags & ISDNLOOP_FLAGS_RBTIMER)) {
 373                         /* schedule b-channel polling */
 374                         card->flags |= ISDNLOOP_FLAGS_RBTIMER;
 375                         save_flags(flags);
 376                         cli();
 377                         del_timer(&card->rb_timer);
 378                         card->rb_timer.function = isdnloop_pollbchan;
 379                         card->rb_timer.data = (unsigned long) card;
 380                         card->rb_timer.expires = jiffies + ISDNLOOP_TIMER_BCREAD;
 381                         add_timer(&card->rb_timer);
 382                         restore_flags(flags);
 383                 }
 384         /* schedule again */
 385         save_flags(flags);
 386         cli();
 387         card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
 388         add_timer(&card->st_timer);
 389         restore_flags(flags);
 390 }
 391
 392 /*
 393  * Append a packet to the transmit buffer-queue.
 394  *
 395  * Parameter:
 396  *   channel = Number of B-channel
 397  *   skb     = packet to send.
 398  *   card    = pointer to card-struct
 399  * Return:
 400  *   Number of bytes transferred, -E??? on error
 401  */
 402 static int
 403 isdnloop_sendbuf(int channel, struct sk_buff *skb, isdnloop_card * card)
 404 {
 405         int len = skb->len;
 406         unsigned long flags;
 407         struct sk_buff *nskb;
 408
 409         if (len > 4000) {
 410                 printk(KERN_WARNING
 411                        "isdnloop: Send packet too large\n");
 412                 return -EINVAL;
 413         }
 414         if (len) {
 415                 if (!(card->flags & (channel) ? ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE))
 416                         return 0;
 417                 if (card->sndcount[channel] > ISDNLOOP_MAX_SQUEUE)
 418                         return 0;
 419                 save_flags(flags);
 420                 cli();
 421                 nskb = dev_alloc_skb(skb->len);
 422                 if (nskb) {
 423                         memcpy(skb_put(nskb, len), skb->data, len);
 424                         skb_queue_tail(&card->bqueue[channel], nskb);
 425                         dev_kfree_skb(skb);
 426                 } else
 427                         len = 0;
 428                 card->sndcount[channel] += len;
 429                 restore_flags(flags);
 430         }
 431         return len;
 432 }
 433
 434 /*
 435  * Read the messages from the card's ringbuffer
 436  *
 437  * Parameter:
 438  *   buf  = pointer to buffer.
 439  *   len  = number of bytes to read.
 440  *   user = flag, 1: called from userlevel 0: called from kernel.
 441  *   card = pointer to card struct.
 442  * Return:
 443  *   number of bytes actually transferred.
 444  */
 445 static int
 446 isdnloop_readstatus(u_char __user *buf, int len, isdnloop_card * card)
 447 {
 448         int count;
 449         u_char __user *p;
 450
 451         for (p = buf, count = 0; count < len; p++, count++) {
 452                 if (card->msg_buf_read == card->msg_buf_write)
 453                         return count;
 454                 if (put_user(*card->msg_buf_read++, p))
 455                         return -EFAULT;
 456                 if (card->msg_buf_read > card->msg_buf_end)
 457                         card->msg_buf_read = card->msg_buf;
 458         }
 459         return count;
 460 }
 461
 462 /*
 463  * Simulate a card's response by appending it to the cards
 464  * message queue.
 465  *
 466  * Parameter:
 467  *   card = pointer to card struct.
 468  *   s    = pointer to message-string.
 469  *   ch   = channel: 0 = generic messages, 1 and 2 = D-channel messages.
 470  * Return:
 471  *   0 on success, 1 on memory squeeze.
 472  */
 473 static int
 474 isdnloop_fake(isdnloop_card * card, char *s, int ch)
 475 {
 476         struct sk_buff *skb;
 477         int len = strlen(s) + ((ch >= 0) ? 3 : 0);
 478
 479         if (!(skb = dev_alloc_skb(len))) {
 480                 printk(KERN_WARNING "isdnloop: Out of memory in isdnloop_fake\n");
 481                 return 1;
 482         }
 483         if (ch >= 0)
 484                 sprintf(skb_put(skb, 3), "%02d;", ch);
 485         memcpy(skb_put(skb, strlen(s)), s, strlen(s));
 486         skb_queue_tail(&card->dqueue, skb);
 487         return 0;
 488 }
 489 /* *INDENT-OFF* */
 490 static isdnloop_stat isdnloop_cmd_table[] =
 491 {
 492         {"BCON_R",         0,  1},      /* B-Channel connect        */
 493         {"BCON_I",         0, 17},      /* B-Channel connect ind    */
 494         {"BDIS_R",         0,  2},      /* B-Channel disconnect     */
 495         {"DDIS_R",         0,  3},      /* D-Channel disconnect     */
 496         {"DCON_R",         0, 16},      /* D-Channel connect        */
 497         {"DSCA_R",         0,  4},      /* Dial 1TR6-SPV     */
 498         {"DCAL_R",         0,  5},      /* Dial */
 499         {"EAZC",           0,  6},      /* Clear EAZ listener */
 500         {"EAZ",            0,  7},      /* Set EAZ listener */
 501         {"SEEAZ",          0,  8},      /* Get EAZ listener */
 502         {"MSN",            0,  9},      /* Set/Clear MSN listener */
 503         {"MSALL",          0, 10},      /* Set multi MSN listeners */
 504         {"SETSIL",         0, 11},      /* Set SI list     */
 505         {"SEESIL",         0, 12},      /* Get SI list     */
 506         {"SILC",           0, 13},      /* Clear SI list     */
 507         {"LOCK",           0, -1},      /* LOCK channel     */
 508         {"UNLOCK",         0, -1},      /* UNLOCK channel     */
 509         {"FV2ON",          1, 14},      /* Leased mode on               */
 510         {"FV2OFF",         1, 15},      /* Leased mode off              */
 511         {NULL, 0, -1}
 512 };
 513 /* *INDENT-ON* */
 514
 515
 516 /*
 517  * Simulate an error-response from a card.
 518  *
 519  * Parameter:
 520  *   card = pointer to card struct.
 521  */
 522 static void
 523 isdnloop_fake_err(isdnloop_card * card)
 524 {
 525         char buf[60];
 526
 527         sprintf(buf, "E%s", card->omsg);
 528         isdnloop_fake(card, buf, -1);
 529         isdnloop_fake(card, "NAK", -1);
 530 }
 531
 532 static u_char ctable_eu[] =
 533 {0x00, 0x11, 0x01, 0x12};
 534 static u_char ctable_1t[] =
 535 {0x00, 0x3b, 0x01, 0x3a};
 536
 537 /*
 538  * Assemble a simplified cause message depending on the
 539  * D-channel protocol used.
 540  *
 541  * Parameter:
 542  *   card = pointer to card struct.
 543  *   loc  = location: 0 = local, 1 = remote.
 544  *   cau  = cause: 1 = busy, 2 = nonexistent callerid, 3 = no user responding.
 545  * Return:
 546  *   Pointer to buffer containing the assembled message.
 547  */
 548 static char *
 549 isdnloop_unicause(isdnloop_card * card, int loc, int cau)
 550 {
 551         static char buf[6];
 552
 553         switch (card->ptype) {
 554                 case ISDN_PTYPE_EURO:
 555                         sprintf(buf, "E%02X%02X", (loc) ? 4 : 2, ctable_eu[cau]);
 556                         break;
 557                 case ISDN_PTYPE_1TR6:
 558                         sprintf(buf, "%02X44", ctable_1t[cau]);
 559                         break;
 560                 default:
 561                         return ("0000");
 562         }
 563         return (buf);
 564 }
 565
 566 /*
 567  * Release a virtual connection. Called from timer interrupt, when
 568  * called party did not respond.
 569  *
 570  * Parameter:
 571  *   card = pointer to card struct.
 572  *   ch   = channel (0-based)
 573  */
 574 static void
 575 isdnloop_atimeout(isdnloop_card * card, int ch)
 576 {
 577         unsigned long flags;
 578         char buf[60];
 579
 580         save_flags(flags);
 581         cli();
 582         if (card->rcard) {
 583                 isdnloop_fake(card->rcard[ch], "DDIS_I", card->rch[ch] + 1);
 584                 card->rcard[ch]->rcard[card->rch[ch]] = NULL;
 585                 card->rcard[ch] = NULL;
 586         }
 587         isdnloop_fake(card, "DDIS_I", ch + 1);
 588         /* No user responding */
 589         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 3));
 590         isdnloop_fake(card, buf, ch + 1);
 591         restore_flags(flags);
 592 }
 593
 594 /*
 595  * Wrapper for isdnloop_atimeout().
 596  */
 597 static void
 598 isdnloop_atimeout0(unsigned long data)
 599 {
 600         isdnloop_card *card = (isdnloop_card *) data;
 601         isdnloop_atimeout(card, 0);
 602 }
 603
 604 /*
 605  * Wrapper for isdnloop_atimeout().
 606  */
 607 static void
 608 isdnloop_atimeout1(unsigned long data)
 609 {
 610         isdnloop_card *card = (isdnloop_card *) data;
 611         isdnloop_atimeout(card, 1);
 612 }
 613
 614 /*
 615  * Install a watchdog for a user, not responding.
 616  *
 617  * Parameter:
 618  *   card = pointer to card struct.
 619  *   ch   = channel to watch for.
 620  */
 621 static void
 622 isdnloop_start_ctimer(isdnloop_card * card, int ch)
 623 {
 624         unsigned long flags;
 625
 626         save_flags(flags);
 627         cli();
 628         init_timer(&card->c_timer[ch]);
 629         card->c_timer[ch].expires = jiffies + ISDNLOOP_TIMER_ALERTWAIT;
 630         if (ch)
 631                 card->c_timer[ch].function = isdnloop_atimeout1;
 632         else
 633                 card->c_timer[ch].function = isdnloop_atimeout0;
 634         card->c_timer[ch].data = (unsigned long) card;
 635         add_timer(&card->c_timer[ch]);
 636         restore_flags(flags);
 637 }
 638
 639 /*
 640  * Kill a pending channel watchdog.
 641  *
 642  * Parameter:
 643  *   card = pointer to card struct.
 644  *   ch   = channel (0-based).
 645  */
 646 static void
 647 isdnloop_kill_ctimer(isdnloop_card * card, int ch)
 648 {
 649         unsigned long flags;
 650
 651         save_flags(flags);
 652         cli();
 653         del_timer(&card->c_timer[ch]);
 654         restore_flags(flags);
 655 }
 656
 657 static u_char si2bit[] =
 658 {0, 1, 0, 0, 0, 2, 0, 4, 0, 0};
 659 static u_char bit2si[] =
 660 {1, 5, 7};
 661
 662 /*
 663  * Try finding a listener for an outgoing call.
 664  *
 665  * Parameter:
 666  *   card = pointer to calling card.
 667  *   p    = pointer to ICN-type setup-string.
 668  *   lch  = channel of calling card.
 669  *   cmd  = pointer to struct to be filled when parsing setup.
 670  * Return:
 671  *   0 = found match, alerting should happen.
 672  *   1 = found matching number but it is busy.
 673  *   2 = no matching listener.
 674  *   3 = found matching number but SI does not match.
 675  */
 676 static int
 677 isdnloop_try_call(isdnloop_card * card, char *p, int lch, isdn_ctrl * cmd)
 678 {
 679         isdnloop_card *cc = cards;
 680         unsigned long flags;
 681         int ch;
 682         int num_match;
 683         int i;
 684         char *e;
 685         char nbuf[32];
 686
 687         isdnloop_parse_setup(p, cmd);
 688         while (cc) {
 689                 for (ch = 0; ch < 2; ch++) {
 690                         /* Exclude ourself */
 691                         if ((cc == card) && (ch == lch))
 692                                 continue;
 693                         num_match = 0;
 694                         switch (cc->ptype) {
 695                                 case ISDN_PTYPE_EURO:
 696                                         for (i = 0; i < 3; i++)
 697                                                 if (!(strcmp(cc->s0num[i], cmd->parm.setup.phone)))
 698                                                         num_match = 1;
 699                                         break;
 700                                 case ISDN_PTYPE_1TR6:
 701                                         e = cc->eazlist[ch];
 702                                         while (*e) {
 703                                                 sprintf(nbuf, "%s%c", cc->s0num[0], *e);
 704                                                 if (!(strcmp(nbuf, cmd->parm.setup.phone)))
 705                                                         num_match = 1;
 706                                                 e++;
 707                                         }
 708                         }
 709                         if (num_match) {
 710                                 save_flags(flags);
 711                                 cli();
 712                                 /* channel idle? */
 713                                 if (!(cc->rcard[ch])) {
 714                                         /* Check SI */
 715                                         if (!(si2bit[cmd->parm.setup.si1] & cc->sil[ch])) {
 716                                                 restore_flags(flags);
 717                                                 return 3;
 718                                         }
 719                                         /* ch is idle, si and number matches */
 720                                         cc->rcard[ch] = card;
 721                                         cc->rch[ch] = lch;
 722                                         card->rcard[lch] = cc;
 723                                         card->rch[lch] = ch;
 724                                         restore_flags(flags);
 725                                         return 0;
 726                                 } else {
 727                                         restore_flags(flags);
 728                                         /* num matches, but busy */
 729                                         if (ch == 1)
 730                                                 return 1;
 731                                 }
 732                         }
 733                 }
 734                 cc = cc->next;
 735         }
 736         return 2;
 737 }
 738
 739 /*
 740  * Depending on D-channel protocol and caller/called, modify
 741  * phone number.
 742  *
 743  * Parameter:
 744  *   card   = pointer to card struct.
 745  *   phone  = pointer phone number.
 746  *   caller = flag: 1 = caller, 0 = called.
 747  * Return:
 748  *   pointer to new phone number.
 749  */
 750 static char *
 751 isdnloop_vstphone(isdnloop_card * card, char *phone, int caller)
 752 {
 753         int i;
 754         static char nphone[30];
 755
 756         if (!card) {
 757                 printk("BUG!!!\n");
 758                 return "";
 759         }
 760         switch (card->ptype) {
 761                 case ISDN_PTYPE_EURO:
 762                         if (caller) {
 763                                 for (i = 0; i < 2; i++)
 764                                         if (!(strcmp(card->s0num[i], phone)))
 765                                                 return (phone);
 766                                 return (card->s0num[0]);
 767                         }
 768                         return (phone);
 769                         break;
 770                 case ISDN_PTYPE_1TR6:
 771                         if (caller) {
 772                                 sprintf(nphone, "%s%c", card->s0num[0], phone[0]);
 773                                 return (nphone);
 774                         } else
 775                                 return (&phone[strlen(phone) - 1]);
 776                         break;
 777         }
 778         return "";
 779 }
 780
 781 /*
 782  * Parse an ICN-type command string sent to the 'card'.
 783  * Perform misc. actions depending on the command.
 784  *
 785  * Parameter:
 786  *   card = pointer to card struct.
 787  */
 788 static void
 789 isdnloop_parse_cmd(isdnloop_card * card)
 790 {
 791         char *p = card->omsg;
 792         isdn_ctrl cmd;
 793         char buf[60];
 794         isdnloop_stat *s = isdnloop_cmd_table;
 795         int action = -1;
 796         int i;
 797         int ch;
 798
 799         if ((card->omsg[0] != '0') && (card->omsg[2] != ';')) {
 800                 isdnloop_fake_err(card);
 801                 return;
 802         }
 803         ch = card->omsg[1] - '0';
 804         if ((ch < 0) || (ch > 2)) {
 805                 isdnloop_fake_err(card);
 806                 return;
 807         }
 808         p += 3;
 809         while (s->statstr) {
 810                 if (!strncmp(p, s->statstr, strlen(s->statstr))) {
 811                         action = s->action;
 812                         if (s->command && (ch != 0)) {
 813                                 isdnloop_fake_err(card);
 814                                 return;
 815                         }
 816                         break;
 817                 }
 818                 s++;
 819         }
 820         if (action == -1)
 821                 return;
 822         switch (action) {
 823                 case 1:
 824                         /* 0x;BCON_R */
 825                         if (card->rcard[ch - 1]) {
 826                                 isdnloop_fake(card->rcard[ch - 1], "BCON_I",
 827                                               card->rch[ch - 1] + 1);
 828                                 isdnloop_fake(card, "BCON_C", ch);
 829                         }
 830                         break;
 831                 case 17:
 832                         /* 0x;BCON_I */
 833                         if (card->rcard[ch - 1]) {
 834                                 isdnloop_fake(card->rcard[ch - 1], "BCON_C",
 835                                               card->rch[ch - 1] + 1);
 836                         }
 837                         break;
 838                 case 2:
 839                         /* 0x;BDIS_R */
 840                         isdnloop_fake(card, "BDIS_C", ch);
 841                         if (card->rcard[ch - 1]) {
 842                                 isdnloop_fake(card->rcard[ch - 1], "BDIS_I",
 843                                               card->rch[ch - 1] + 1);
 844                         }
 845                         break;
 846                 case 16:
 847                         /* 0x;DCON_R */
 848                         isdnloop_kill_ctimer(card, ch - 1);
 849                         if (card->rcard[ch - 1]) {
 850                                 isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
 851                                 isdnloop_fake(card->rcard[ch - 1], "DCON_C",
 852                                               card->rch[ch - 1] + 1);
 853                                 isdnloop_fake(card, "DCON_C", ch);
 854                         }
 855                         break;
 856                 case 3:
 857                         /* 0x;DDIS_R */
 858                         isdnloop_kill_ctimer(card, ch - 1);
 859                         if (card->rcard[ch - 1]) {
 860                                 isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
 861                                 isdnloop_fake(card->rcard[ch - 1], "DDIS_I",
 862                                               card->rch[ch - 1] + 1);
 863                                 card->rcard[ch - 1] = NULL;
 864                         }
 865                         isdnloop_fake(card, "DDIS_C", ch);
 866                         break;
 867                 case 4:
 868                         /* 0x;DSCA_Rdd,yy,zz,oo */
 869                         if (card->ptype != ISDN_PTYPE_1TR6) {
 870                                 isdnloop_fake_err(card);
 871                                 return;
 872                         }
 873                         /* Fall through */
 874                 case 5:
 875                         /* 0x;DCAL_Rdd,yy,zz,oo */
 876                         p += 6;
 877                         switch (isdnloop_try_call(card, p, ch - 1, &cmd)) {
 878                                 case 0:
 879                                         /* Alerting */
 880                                         sprintf(buf, "D%s_I%s,%02d,%02d,%s",
 881                                            (action == 4) ? "SCA" : "CAL",
 882                                                 isdnloop_vstphone(card, cmd.parm.setup.eazmsn, 1),
 883                                                 cmd.parm.setup.si1,
 884                                                 cmd.parm.setup.si2,
 885                                         isdnloop_vstphone(card->rcard[ch - 1],
 886                                                cmd.parm.setup.phone, 0));
 887                                         isdnloop_fake(card->rcard[ch - 1], buf, card->rch[ch - 1] + 1);
 888                                         /* Fall through */
 889                                 case 3:
 890                                         /* si1 does not match, don't alert but start timer */
 891                                         isdnloop_start_ctimer(card, ch - 1);
 892                                         break;
 893                                 case 1:
 894                                         /* Remote busy */
 895                                         isdnloop_fake(card, "DDIS_I", ch);
 896                                         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 1));
 897                                         isdnloop_fake(card, buf, ch);
 898                                         break;
 899                                 case 2:
 900                                         /* No such user */
 901                                         isdnloop_fake(card, "DDIS_I", ch);
 902                                         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 2));
 903                                         isdnloop_fake(card, buf, ch);
 904                                         break;
 905                         }
 906                         break;
 907                 case 6:
 908                         /* 0x;EAZC */
 909                         card->eazlist[ch - 1][0] = '\0';
 910                         break;
 911                 case 7:
 912                         /* 0x;EAZ */
 913                         p += 3;
 914                         strcpy(card->eazlist[ch - 1], p);
 915                         break;
 916                 case 8:
 917                         /* 0x;SEEAZ */
 918                         sprintf(buf, "EAZ-LIST: %s", card->eazlist[ch - 1]);
 919                         isdnloop_fake(card, buf, ch + 1);
 920                         break;
 921                 case 9:
 922                         /* 0x;MSN */
 923                         break;
 924                 case 10:
 925                         /* 0x;MSNALL */
 926                         break;
 927                 case 11:
 928                         /* 0x;SETSIL */
 929                         p += 6;
 930                         i = 0;
 931                         while (strchr("0157", *p)) {
 932                                 if (i)
 933                                         card->sil[ch - 1] |= si2bit[*p - '0'];
 934                                 i = (*p++ == '0');
 935                         }
 936                         if (*p)
 937                                 isdnloop_fake_err(card);
 938                         break;
 939                 case 12:
 940                         /* 0x;SEESIL */
 941                         sprintf(buf, "SIN-LIST: ");
 942                         p = buf + 10;
 943                         for (i = 0; i < 3; i++)
 944                                 if (card->sil[ch - 1] & (1 << i))
 945                                         p += sprintf(p, "%02d", bit2si[i]);
 946                         isdnloop_fake(card, buf, ch + 1);
 947                         break;
 948                 case 13:
 949                         /* 0x;SILC */
 950                         card->sil[ch - 1] = 0;
 951                         break;
 952                 case 14:
 953                         /* 00;FV2ON */
 954                         break;
 955                 case 15:
 956                         /* 00;FV2OFF */
 957                         break;
 958         }
 959 }
 960
 961 /*
 962  * Put command-strings into the of the 'card'. In reality, execute them
 963  * right in place by calling isdnloop_parse_cmd(). Also copy every
 964  * command to the read message ringbuffer, preceeding it with a '>'.
 965  * These mesagges can be read at /dev/isdnctrl.
 966  *
 967  * Parameter:
 968  *   buf  = pointer to command buffer.
 969  *   len  = length of buffer data.
 970  *   user = flag: 1 = called form userlevel, 0 called from kernel.
 971  *   card = pointer to card struct.
 972  * Return:
 973  *   number of bytes transferred (currently always equals len).
 974  */
 975 static int
 976 isdnloop_writecmd(const u_char * buf, int len, int user, isdnloop_card * card)
 977 {
 978         int xcount = 0;
 979         int ocount = 1;
 980         isdn_ctrl cmd;
 981
 982         while (len) {
 983                 int count = len;
 984                 u_char *p;
 985                 u_char msg[0x100];
 986
 987                 if (count > 255)
 988                         count = 255;
 989                 if (user) {
 990                         if (copy_from_user(msg, buf, count))
 991                                 return -EFAULT;
 992                 } else
 993                         memcpy(msg, buf, count);
 994                 isdnloop_putmsg(card, '>');
 995                 for (p = msg; count > 0; count--, p++) {
 996                         len--;
 997                         xcount++;
 998                         isdnloop_putmsg(card, *p);
 999                         card->omsg[card->optr] = *p;
1000                         if (*p == '\n') {
1001                                 card->omsg[card->optr] = '\0';
1002                                 card->optr = 0;
1003                                 isdnloop_parse_cmd(card);
1004                                 if (len) {
1005                                         isdnloop_putmsg(card, '>');
1006                                         ocount++;
1007                                 }
1008                         } else {
1009                                 if (card->optr < 59)
1010                                         card->optr++;
1011                         }
1012                         ocount++;
1013                 }
1014         }
1015         cmd.command = ISDN_STAT_STAVAIL;
1016         cmd.driver = card->myid;
1017         cmd.arg = ocount;
1018         card->interface.statcallb(&cmd);
1019         return xcount;
1020 }
1021
1022 /*
1023  * Delete card's pending timers, send STOP to linklevel
1024  */
1025 static void
1026 isdnloop_stopcard(isdnloop_card * card)
1027 {
1028         unsigned long flags;
1029         isdn_ctrl cmd;
1030
1031         save_flags(flags);
1032         cli();
1033         if (card->flags & ISDNLOOP_FLAGS_RUNNING) {
1034                 card->flags &= ~ISDNLOOP_FLAGS_RUNNING;
1035                 del_timer(&card->st_timer);
1036                 del_timer(&card->rb_timer);
1037                 del_timer(&card->c_timer[0]);
1038                 del_timer(&card->c_timer[1]);
1039                 cmd.command = ISDN_STAT_STOP;
1040                 cmd.driver = card->myid;
1041                 card->interface.statcallb(&cmd);
1042         }
1043         restore_flags(flags);
1044 }
1045
1046 /*
1047  * Stop all cards before unload.
1048  */
1049 static void
1050 isdnloop_stopallcards(void)
1051 {
1052         isdnloop_card *p = cards;
1053
1054         while (p) {
1055                 isdnloop_stopcard(p);
1056                 p = p->next;
1057         }
1058 }
1059
1060 /*
1061  * Start a 'card'. Simulate card's boot message and set the phone
1062  * number(s) of the virtual 'S0-Interface'. Install D-channel
1063  * poll timer.
1064  *
1065  * Parameter:
1066  *   card  = pointer to card struct.
1067  *   sdefp = pointer to struct holding ioctl parameters.
1068  * Return:
1069  *   0 on success, -E??? otherwise.
1070  */
1071 static int
1072 isdnloop_start(isdnloop_card * card, isdnloop_sdef * sdefp)
1073 {
1074         unsigned long flags;
1075         isdnloop_sdef sdef;
1076         int i;
1077
1078         if (card->flags & ISDNLOOP_FLAGS_RUNNING)
1079                 return -EBUSY;
1080         if (copy_from_user((char *) &sdef, (char *) sdefp, sizeof(sdef)))
1081                 return -EFAULT;
1082         save_flags(flags);
1083         cli();
1084         switch (sdef.ptype) {
1085                 case ISDN_PTYPE_EURO:
1086                         if (isdnloop_fake(card, "DRV1.23EC-Q.931-CAPI-CNS-BASIS-20.02.96",
1087                                           -1)) {
1088                                 restore_flags(flags);
1089                                 return -ENOMEM;
1090                         }
1091                         card->sil[0] = card->sil[1] = 4;
1092                         if (isdnloop_fake(card, "TEI OK", 0)) {
1093                                 restore_flags(flags);
1094                                 return -ENOMEM;
1095                         }
1096                         for (i = 0; i < 3; i++)
1097                                 strcpy(card->s0num[i], sdef.num[i]);
1098                         break;
1099                 case ISDN_PTYPE_1TR6:
1100                         if (isdnloop_fake(card, "DRV1.04TC-1TR6-CAPI-CNS-BASIS-29.11.95",
1101                                           -1)) {
1102                                 restore_flags(flags);
1103                                 return -ENOMEM;
1104                         }
1105                         card->sil[0] = card->sil[1] = 4;
1106                         if (isdnloop_fake(card, "TEI OK", 0)) {
1107                                 restore_flags(flags);
1108                                 return -ENOMEM;
1109                         }
1110                         strcpy(card->s0num[0], sdef.num[0]);
1111                         card->s0num[1][0] = '\0';
1112                         card->s0num[2][0] = '\0';
1113                         break;
1114                 default:
1115                         restore_flags(flags);
1116                         printk(KERN_WARNING "isdnloop: Illegal D-channel protocol %d\n",
1117                                sdef.ptype);
1118                         return -EINVAL;
1119         }
1120         init_timer(&card->st_timer);
1121         card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
1122         card->st_timer.function = isdnloop_polldchan;
1123         card->st_timer.data = (unsigned long) card;
1124         add_timer(&card->st_timer);
1125         card->flags |= ISDNLOOP_FLAGS_RUNNING;
1126         restore_flags(flags);
1127         return 0;
1128 }
1129
1130 /*
1131  * Main handler for commands sent by linklevel.
1132  */
1133 static int
1134 isdnloop_command(isdn_ctrl * c, isdnloop_card * card)
1135 {
1136         ulong a;
1137         int i;
1138         char cbuf[60];
1139         isdn_ctrl cmd;
1140         isdnloop_cdef cdef;
1141
1142         switch (c->command) {
1143                 case ISDN_CMD_IOCTL:
1144                         memcpy(&a, c->parm.num, sizeof(ulong));
1145                         switch (c->arg) {
1146                                 case ISDNLOOP_IOCTL_DEBUGVAR:
1147                                         return (ulong) card;
1148                                 case ISDNLOOP_IOCTL_STARTUP:
1149                                         if (!access_ok(VERIFY_READ, (void *) a, sizeof(isdnloop_sdef)))
1150                                                 return -EFAULT;
1151                                         return (isdnloop_start(card, (isdnloop_sdef *) a));
1152                                         break;
1153                                 case ISDNLOOP_IOCTL_ADDCARD:
1154                                         if (copy_from_user((char *)&cdef,
1155                                                            (char *)a,
1156                                                            sizeof(cdef)))
1157                                                 return -EFAULT;
1158                                         return (isdnloop_addcard(cdef.id1));
1159                                         break;
1160                                 case ISDNLOOP_IOCTL_LEASEDCFG:
1161                                         if (a) {
1162                                                 if (!card->leased) {
1163                                                         card->leased = 1;
1164                                                         while (card->ptype == ISDN_PTYPE_UNKNOWN)
1165                                                                 schedule_timeout_interruptible(10);
1166                                                         schedule_timeout_interruptible(10);
1167                                                         sprintf(cbuf, "00;FV2ON\n01;EAZ1\n02;EAZ2\n");
1168                                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1169                                                         printk(KERN_INFO
1170                                                                "isdnloop: (%s) Leased-line mode enabled\n",
1171                                                                CID);
1172                                                         cmd.command = ISDN_STAT_RUN;
1173                                                         cmd.driver = card->myid;
1174                                                         cmd.arg = 0;
1175                                                         card->interface.statcallb(&cmd);
1176                                                 }
1177                                         } else {
1178                                                 if (card->leased) {
1179                                                         card->leased = 0;
1180                                                         sprintf(cbuf, "00;FV2OFF\n");
1181                                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1182                                                         printk(KERN_INFO
1183                                                                "isdnloop: (%s) Leased-line mode disabled\n",
1184                                                                CID);
1185                                                         cmd.command = ISDN_STAT_RUN;
1186                                                         cmd.driver = card->myid;
1187                                                         cmd.arg = 0;
1188                                                         card->interface.statcallb(&cmd);
1189                                                 }
1190                                         }
1191                                         return 0;
1192                                 default:
1193                                         return -EINVAL;
1194                         }
1195                         break;
1196                 case ISDN_CMD_DIAL:
1197                         if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1198                                 return -ENODEV;
1199                         if (card->leased)
1200                                 break;
1201                         if ((c->arg & 255) < ISDNLOOP_BCH) {
1202                                 char *p;
1203                                 char dial[50];
1204                                 char dcode[4];
1205
1206                                 a = c->arg;
1207                                 p = c->parm.setup.phone;
1208                                 if (*p == 's' || *p == 'S') {
1209                                         /* Dial for SPV */
1210                                         p++;
1211                                         strcpy(dcode, "SCA");
1212                                 } else
1213                                         /* Normal Dial */
1214                                         strcpy(dcode, "CAL");
1215                                 strcpy(dial, p);
1216                                 sprintf(cbuf, "%02d;D%s_R%s,%02d,%02d,%s\n", (int) (a + 1),
1217                                         dcode, dial, c->parm.setup.si1,
1218                                 c->parm.setup.si2, c->parm.setup.eazmsn);
1219                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1220                         }
1221                         break;
1222                 case ISDN_CMD_ACCEPTD:
1223                         if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1224                                 return -ENODEV;
1225                         if (c->arg < ISDNLOOP_BCH) {
1226                                 a = c->arg + 1;
1227                                 cbuf[0] = 0;
1228                                 switch (card->l2_proto[a - 1]) {
1229                                         case ISDN_PROTO_L2_X75I:
1230                                                 sprintf(cbuf, "%02d;BX75\n", (int) a);
1231                                                 break;
1232 #ifdef CONFIG_ISDN_X25
1233                                         case ISDN_PROTO_L2_X25DTE:
1234                                                 sprintf(cbuf, "%02d;BX2T\n", (int) a);
1235                                                 break;
1236                                         case ISDN_PROTO_L2_X25DCE:
1237                                                 sprintf(cbuf, "%02d;BX2C\n", (int) a);
1238                                                 break;
1239 #endif
1240                                         case ISDN_PROTO_L2_HDLC:
1241                                                 sprintf(cbuf, "%02d;BTRA\n", (int) a);
1242                                                 break;
1243                                 }
1244                                 if (strlen(cbuf))
1245                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1246                                 sprintf(cbuf, "%02d;DCON_R\n", (int) a);
1247                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1248                         }
1249                         break;
1250                 case ISDN_CMD_ACCEPTB:
1251                         if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1252                                 return -ENODEV;
1253                         if (c->arg < ISDNLOOP_BCH) {
1254                                 a = c->arg + 1;
1255                                 switch (card->l2_proto[a - 1]) {
1256                                         case ISDN_PROTO_L2_X75I:
1257                                                 sprintf(cbuf, "%02d;BCON_R,BX75\n", (int) a);
1258                                                 break;
1259 #ifdef CONFIG_ISDN_X25
1260                                         case ISDN_PROTO_L2_X25DTE:
1261                                                 sprintf(cbuf, "%02d;BCON_R,BX2T\n", (int) a);
1262                                                 break;
1263                                         case ISDN_PROTO_L2_X25DCE:
1264                                                 sprintf(cbuf, "%02d;BCON_R,BX2C\n", (int) a);
1265                                                 break;
1266 #endif
1267                                         case ISDN_PROTO_L2_HDLC:
1268                                                 sprintf(cbuf, "%02d;BCON_R,BTRA\n", (int) a);
1269                                                 break;
1270                                         default:
1271                                                 sprintf(cbuf, "%02d;BCON_R\n", (int) a);
1272                                 }
1273                                 printk(KERN_DEBUG "isdnloop writecmd '%s'\n", cbuf);
1274                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1275                                 break;
1276                 case ISDN_CMD_HANGUP:
1277                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1278                                         return -ENODEV;
1279                                 if (c->arg < ISDNLOOP_BCH) {
1280                                         a = c->arg + 1;
1281                                         sprintf(cbuf, "%02d;BDIS_R\n%02d;DDIS_R\n", (int) a, (int) a);
1282                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1283                                 }
1284                                 break;
1285                 case ISDN_CMD_SETEAZ:
1286                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1287                                         return -ENODEV;
1288                                 if (card->leased)
1289                                         break;
1290                                 if (c->arg < ISDNLOOP_BCH) {
1291                                         a = c->arg + 1;
1292                                         if (card->ptype == ISDN_PTYPE_EURO) {
1293                                                 sprintf(cbuf, "%02d;MS%s%s\n", (int) a,
1294                                                         c->parm.num[0] ? "N" : "ALL", c->parm.num);
1295                                         } else
1296                                                 sprintf(cbuf, "%02d;EAZ%s\n", (int) a,
1297                                                         c->parm.num[0] ? c->parm.num : (u_char *) "0123456789");
1298                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1299                                 }
1300                                 break;
1301                 case ISDN_CMD_CLREAZ:
1302                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1303                                         return -ENODEV;
1304                                 if (card->leased)
1305                                         break;
1306                                 if (c->arg < ISDNLOOP_BCH) {
1307                                         a = c->arg + 1;
1308                                         if (card->ptype == ISDN_PTYPE_EURO)
1309                                                 sprintf(cbuf, "%02d;MSNC\n", (int) a);
1310                                         else
1311                                                 sprintf(cbuf, "%02d;EAZC\n", (int) a);
1312                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1313                                 }
1314                                 break;
1315                 case ISDN_CMD_SETL2:
1316                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1317                                         return -ENODEV;
1318                                 if ((c->arg & 255) < ISDNLOOP_BCH) {
1319                                         a = c->arg;
1320                                         switch (a >> 8) {
1321                                                 case ISDN_PROTO_L2_X75I:
1322                                                         sprintf(cbuf, "%02d;BX75\n", (int) (a & 255) + 1);
1323                                                         break;
1324 #ifdef CONFIG_ISDN_X25
1325                                                 case ISDN_PROTO_L2_X25DTE:
1326                                                         sprintf(cbuf, "%02d;BX2T\n", (int) (a & 255) + 1);
1327                                                         break;
1328                                                 case ISDN_PROTO_L2_X25DCE:
1329                                                         sprintf(cbuf, "%02d;BX2C\n", (int) (a & 255) + 1);
1330                                                         break;
1331 #endif
1332                                                 case ISDN_PROTO_L2_HDLC:
1333                                                         sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1334                                                         break;
1335                                                 case ISDN_PROTO_L2_TRANS:
1336                                                         sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1337                                                         break;
1338                                                 default:
1339                                                         return -EINVAL;
1340                                         }
1341                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1342                                         card->l2_proto[a & 255] = (a >> 8);
1343                                 }
1344                                 break;
1345                 case ISDN_CMD_SETL3:
1346                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1347                                         return -ENODEV;
1348                                 return 0;
1349                 default:
1350                                 return -EINVAL;
1351                         }
1352         }
1353         return 0;
1354 }
1355
1356 /*
1357  * Find card with given driverId
1358  */
1359 static inline isdnloop_card *
1360 isdnloop_findcard(int driverid)
1361 {
1362         isdnloop_card *p = cards;
1363
1364         while (p) {
1365                 if (p->myid == driverid)
1366                         return p;
1367                 p = p->next;
1368         }
1369         return (isdnloop_card *) 0;
1370 }
1371
1372 /*
1373  * Wrapper functions for interface to linklevel
1374  */
1375 static int
1376 if_command(isdn_ctrl * c)
1377 {
1378         isdnloop_card *card = isdnloop_findcard(c->driver);
1379
1380         if (card)
1381                 return (isdnloop_command(c, card));
1382         printk(KERN_ERR
1383                "isdnloop: if_command called with invalid driverId!\n");
1384         return -ENODEV;
1385 }
1386
1387 static int
1388 if_writecmd(const u_char __user *buf, int len, int id, int channel)
1389 {
1390         isdnloop_card *card = isdnloop_findcard(id);
1391
1392         if (card) {
1393                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1394                         return -ENODEV;
1395                 return (isdnloop_writecmd(buf, len, 1, card));
1396         }
1397         printk(KERN_ERR
1398                "isdnloop: if_writecmd called with invalid driverId!\n");
1399         return -ENODEV;
1400 }
1401
1402 static int
1403 if_readstatus(u_char __user *buf, int len, int id, int channel)
1404 {
1405         isdnloop_card *card = isdnloop_findcard(id);
1406
1407         if (card) {
1408                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1409                         return -ENODEV;
1410                 return (isdnloop_readstatus(buf, len, card));
1411         }
1412         printk(KERN_ERR
1413                "isdnloop: if_readstatus called with invalid driverId!\n");
1414         return -ENODEV;
1415 }
1416
1417 static int
1418 if_sendbuf(int id, int channel, int ack, struct sk_buff *skb)
1419 {
1420         isdnloop_card *card = isdnloop_findcard(id);
1421
1422         if (card) {
1423                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1424                         return -ENODEV;
1425                 /* ack request stored in skb scratch area */
1426                 *(skb->head) = ack;
1427                 return (isdnloop_sendbuf(channel, skb, card));
1428         }
1429         printk(KERN_ERR
1430                "isdnloop: if_sendbuf called with invalid driverId!\n");
1431         return -ENODEV;
1432 }
1433
1434 /*
1435  * Allocate a new card-struct, initialize it
1436  * link it into cards-list and register it at linklevel.
1437  */
1438 static isdnloop_card *
1439 isdnloop_initcard(char *id)
1440 {
1441         isdnloop_card *card;
1442         int i;
1443
1444         if (!(card = (isdnloop_card *) kmalloc(sizeof(isdnloop_card), GFP_KERNEL))) {
1445                 printk(KERN_WARNING
1446                  "isdnloop: (%s) Could not allocate card-struct.\n", id);
1447                 return (isdnloop_card *) 0;
1448         }
1449         memset((char *) card, 0, sizeof(isdnloop_card));
1450         card->interface.owner = THIS_MODULE;
1451         card->interface.channels = ISDNLOOP_BCH;
1452         card->interface.hl_hdrlen  = 1; /* scratch area for storing ack flag*/
1453         card->interface.maxbufsize = 4000;
1454         card->interface.command = if_command;
1455         card->interface.writebuf_skb = if_sendbuf;
1456         card->interface.writecmd = if_writecmd;
1457         card->interface.readstat = if_readstatus;
1458         card->interface.features = ISDN_FEATURE_L2_X75I |
1459 #ifdef CONFIG_ISDN_X25
1460             ISDN_FEATURE_L2_X25DTE |
1461             ISDN_FEATURE_L2_X25DCE |
1462 #endif
1463             ISDN_FEATURE_L2_HDLC |
1464             ISDN_FEATURE_L3_TRANS |
1465             ISDN_FEATURE_P_UNKNOWN;
1466         card->ptype = ISDN_PTYPE_UNKNOWN;
1467         strlcpy(card->interface.id, id, sizeof(card->interface.id));
1468         card->msg_buf_write = card->msg_buf;
1469         card->msg_buf_read = card->msg_buf;
1470         card->msg_buf_end = &card->msg_buf[sizeof(card->msg_buf) - 1];
1471         for (i = 0; i < ISDNLOOP_BCH; i++) {
1472                 card->l2_proto[i] = ISDN_PROTO_L2_X75I;
1473                 skb_queue_head_init(&card->bqueue[i]);
1474         }
1475         skb_queue_head_init(&card->dqueue);
1476         card->next = cards;
1477         cards = card;
1478         if (!register_isdn(&card->interface)) {
1479                 cards = cards->next;
1480                 printk(KERN_WARNING
1481                        "isdnloop: Unable to register %s\n", id);
1482                 kfree(card);
1483                 return (isdnloop_card *) 0;
1484         }
1485         card->myid = card->interface.channels;
1486         return card;
1487 }
1488
1489 static int
1490 isdnloop_addcard(char *id1)
1491 {
1492         isdnloop_card *card;
1493
1494         if (!(card = isdnloop_initcard(id1))) {
1495                 return -EIO;
1496         }
1497         printk(KERN_INFO
1498                "isdnloop: (%s) virtual card added\n",
1499                card->interface.id);
1500         return 0;
1501 }
1502
1503 static int __init
1504 isdnloop_init(void)
1505 {
1506         char *p;
1507         char rev[10];
1508
1509         if ((p = strchr(revision, ':'))) {
1510                 strcpy(rev, p + 1);
1511                 p = strchr(rev, '$');
1512                 *p = 0;
1513         } else
1514                 strcpy(rev, " ??? ");
1515         printk(KERN_NOTICE "isdnloop-ISDN-driver Rev%s\n", rev);
1516
1517         if (isdnloop_id)
1518                 return (isdnloop_addcard(isdnloop_id));
1519
1520         return 0;
1521 }
1522
1523 static void __exit
1524 isdnloop_exit(void)
1525 {
1526         isdn_ctrl cmd;
1527         isdnloop_card *card = cards;
1528         isdnloop_card *last;
1529         int i;
1530
1531         isdnloop_stopallcards();
1532         while (card) {
1533                 cmd.command = ISDN_STAT_UNLOAD;
1534                 cmd.driver = card->myid;
1535                 card->interface.statcallb(&cmd);
1536                 for (i = 0; i < ISDNLOOP_BCH; i++)
1537                         isdnloop_free_queue(card, i);
1538                 card = card->next;
1539         }
1540         card = cards;
1541         while (card) {
1542                 last = card;
1543                 skb_queue_purge(&card->dqueue);
1544                 card = card->next;
1545                 kfree(last);
1546         }
1547         printk(KERN_NOTICE "isdnloop-ISDN-driver unloaded\n");
1548 }
1549
1550 module_init(isdnloop_init);
1551 module_exit(isdnloop_exit);