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/config.h>
  13 #include <linux/module.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/init.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_PARM(isdnloop_id, "s");
  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 * buf, int len, int user, isdnloop_card * card)
 447 {
 448         int count;
 449         u_char *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 (user)
 455                         put_user(*card->msg_buf_read++, p);
 456                 else
 457                         *p = *card->msg_buf_read++;
 458                 if (card->msg_buf_read > card->msg_buf_end)
 459                         card->msg_buf_read = card->msg_buf;
 460         }
 461         return count;
 462 }
 463
 464 /*
 465  * Simulate a card's response by appending it to the cards
 466  * message queue.
 467  *
 468  * Parameter:
 469  *   card = pointer to card struct.
 470  *   s    = pointer to message-string.
 471  *   ch   = channel: 0 = generic messages, 1 and 2 = D-channel messages.
 472  * Return:
 473  *   0 on success, 1 on memory squeeze.
 474  */
 475 static int
 476 isdnloop_fake(isdnloop_card * card, char *s, int ch)
 477 {
 478         struct sk_buff *skb;
 479         int len = strlen(s) + ((ch >= 0) ? 3 : 0);
 480
 481         if (!(skb = dev_alloc_skb(len))) {
 482                 printk(KERN_WARNING "isdnloop: Out of memory in isdnloop_fake\n");
 483                 return 1;
 484         }
 485         if (ch >= 0)
 486                 sprintf(skb_put(skb, 3), "%02d;", ch);
 487         memcpy(skb_put(skb, strlen(s)), s, strlen(s));
 488         skb_queue_tail(&card->dqueue, skb);
 489         return 0;
 490 }
 491 /* *INDENT-OFF* */
 492 static isdnloop_stat isdnloop_cmd_table[] =
 493 {
 494         {"BCON_R",         0,  1},      /* B-Channel connect        */
 495         {"BCON_I",         0, 17},      /* B-Channel connect ind    */
 496         {"BDIS_R",         0,  2},      /* B-Channel disconnect     */
 497         {"DDIS_R",         0,  3},      /* D-Channel disconnect     */
 498         {"DCON_R",         0, 16},      /* D-Channel connect        */
 499         {"DSCA_R",         0,  4},      /* Dial 1TR6-SPV     */
 500         {"DCAL_R",         0,  5},      /* Dial */
 501         {"EAZC",           0,  6},      /* Clear EAZ listener */
 502         {"EAZ",            0,  7},      /* Set EAZ listener */
 503         {"SEEAZ",          0,  8},      /* Get EAZ listener */
 504         {"MSN",            0,  9},      /* Set/Clear MSN listener */
 505         {"MSALL",          0, 10},      /* Set multi MSN listeners */
 506         {"SETSIL",         0, 11},      /* Set SI list     */
 507         {"SEESIL",         0, 12},      /* Get SI list     */
 508         {"SILC",           0, 13},      /* Clear SI list     */
 509         {"LOCK",           0, -1},      /* LOCK channel     */
 510         {"UNLOCK",         0, -1},      /* UNLOCK channel     */
 511         {"FV2ON",          1, 14},      /* Leased mode on               */
 512         {"FV2OFF",         1, 15},      /* Leased mode off              */
 513         {NULL, 0, -1}
 514 };
 515 /* *INDENT-ON* */
 516
 517
 518 /*
 519  * Simulate an error-response from a card.
 520  *
 521  * Parameter:
 522  *   card = pointer to card struct.
 523  */
 524 static void
 525 isdnloop_fake_err(isdnloop_card * card)
 526 {
 527         char buf[60];
 528
 529         sprintf(buf, "E%s", card->omsg);
 530         isdnloop_fake(card, buf, -1);
 531         isdnloop_fake(card, "NAK", -1);
 532 }
 533
 534 static u_char ctable_eu[] =
 535 {0x00, 0x11, 0x01, 0x12};
 536 static u_char ctable_1t[] =
 537 {0x00, 0x3b, 0x01, 0x3a};
 538
 539 /*
 540  * Assemble a simplified cause message depending on the
 541  * D-channel protocol used.
 542  *
 543  * Parameter:
 544  *   card = pointer to card struct.
 545  *   loc  = location: 0 = local, 1 = remote.
 546  *   cau  = cause: 1 = busy, 2 = nonexistent callerid, 3 = no user responding.
 547  * Return:
 548  *   Pointer to buffer containing the assembled message.
 549  */
 550 static char *
 551 isdnloop_unicause(isdnloop_card * card, int loc, int cau)
 552 {
 553         static char buf[6];
 554
 555         switch (card->ptype) {
 556                 case ISDN_PTYPE_EURO:
 557                         sprintf(buf, "E%02X%02X", (loc) ? 4 : 2, ctable_eu[cau]);
 558                         break;
 559                 case ISDN_PTYPE_1TR6:
 560                         sprintf(buf, "%02X44", ctable_1t[cau]);
 561                         break;
 562                 default:
 563                         return ("0000");
 564         }
 565         return (buf);
 566 }
 567
 568 /*
 569  * Release a virtual connection. Called from timer interrupt, when
 570  * called party did not respond.
 571  *
 572  * Parameter:
 573  *   card = pointer to card struct.
 574  *   ch   = channel (0-based)
 575  */
 576 static void
 577 isdnloop_atimeout(isdnloop_card * card, int ch)
 578 {
 579         unsigned long flags;
 580         char buf[60];
 581
 582         save_flags(flags);
 583         cli();
 584         if (card->rcard) {
 585                 isdnloop_fake(card->rcard[ch], "DDIS_I", card->rch[ch] + 1);
 586                 card->rcard[ch]->rcard[card->rch[ch]] = NULL;
 587                 card->rcard[ch] = NULL;
 588         }
 589         isdnloop_fake(card, "DDIS_I", ch + 1);
 590         /* No user responding */
 591         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 3));
 592         isdnloop_fake(card, buf, ch + 1);
 593         restore_flags(flags);
 594 }
 595
 596 /*
 597  * Wrapper for isdnloop_atimeout().
 598  */
 599 static void
 600 isdnloop_atimeout0(unsigned long data)
 601 {
 602         isdnloop_card *card = (isdnloop_card *) data;
 603         isdnloop_atimeout(card, 0);
 604 }
 605
 606 /*
 607  * Wrapper for isdnloop_atimeout().
 608  */
 609 static void
 610 isdnloop_atimeout1(unsigned long data)
 611 {
 612         isdnloop_card *card = (isdnloop_card *) data;
 613         isdnloop_atimeout(card, 1);
 614 }
 615
 616 /*
 617  * Install a watchdog for a user, not responding.
 618  *
 619  * Parameter:
 620  *   card = pointer to card struct.
 621  *   ch   = channel to watch for.
 622  */
 623 static void
 624 isdnloop_start_ctimer(isdnloop_card * card, int ch)
 625 {
 626         unsigned long flags;
 627
 628         save_flags(flags);
 629         cli();
 630         init_timer(&card->c_timer[ch]);
 631         card->c_timer[ch].expires = jiffies + ISDNLOOP_TIMER_ALERTWAIT;
 632         if (ch)
 633                 card->c_timer[ch].function = isdnloop_atimeout1;
 634         else
 635                 card->c_timer[ch].function = isdnloop_atimeout0;
 636         card->c_timer[ch].data = (unsigned long) card;
 637         add_timer(&card->c_timer[ch]);
 638         restore_flags(flags);
 639 }
 640
 641 /*
 642  * Kill a pending channel watchdog.
 643  *
 644  * Parameter:
 645  *   card = pointer to card struct.
 646  *   ch   = channel (0-based).
 647  */
 648 static void
 649 isdnloop_kill_ctimer(isdnloop_card * card, int ch)
 650 {
 651         unsigned long flags;
 652
 653         save_flags(flags);
 654         cli();
 655         del_timer(&card->c_timer[ch]);
 656         restore_flags(flags);
 657 }
 658
 659 static u_char si2bit[] =
 660 {0, 1, 0, 0, 0, 2, 0, 4, 0, 0};
 661 static u_char bit2si[] =
 662 {1, 5, 7};
 663
 664 /*
 665  * Try finding a listener for an outgoing call.
 666  *
 667  * Parameter:
 668  *   card = pointer to calling card.
 669  *   p    = pointer to ICN-type setup-string.
 670  *   lch  = channel of calling card.
 671  *   cmd  = pointer to struct to be filled when parsing setup.
 672  * Return:
 673  *   0 = found match, alerting should happen.
 674  *   1 = found matching number but it is busy.
 675  *   2 = no matching listener.
 676  *   3 = found matching number but SI does not match.
 677  */
 678 static int
 679 isdnloop_try_call(isdnloop_card * card, char *p, int lch, isdn_ctrl * cmd)
 680 {
 681         isdnloop_card *cc = cards;
 682         unsigned long flags;
 683         int ch;
 684         int num_match;
 685         int i;
 686         char *e;
 687         char nbuf[32];
 688
 689         isdnloop_parse_setup(p, cmd);
 690         while (cc) {
 691                 for (ch = 0; ch < 2; ch++) {
 692                         /* Exclude ourself */
 693                         if ((cc == card) && (ch == lch))
 694                                 continue;
 695                         num_match = 0;
 696                         switch (cc->ptype) {
 697                                 case ISDN_PTYPE_EURO:
 698                                         for (i = 0; i < 3; i++)
 699                                                 if (!(strcmp(cc->s0num[i], cmd->parm.setup.phone)))
 700                                                         num_match = 1;
 701                                         break;
 702                                 case ISDN_PTYPE_1TR6:
 703                                         e = cc->eazlist[ch];
 704                                         while (*e) {
 705                                                 sprintf(nbuf, "%s%c", cc->s0num[0], *e);
 706                                                 if (!(strcmp(nbuf, cmd->parm.setup.phone)))
 707                                                         num_match = 1;
 708                                                 e++;
 709                                         }
 710                         }
 711                         if (num_match) {
 712                                 save_flags(flags);
 713                                 cli();
 714                                 /* channel idle? */
 715                                 if (!(cc->rcard[ch])) {
 716                                         /* Check SI */
 717                                         if (!(si2bit[cmd->parm.setup.si1] & cc->sil[ch])) {
 718                                                 restore_flags(flags);
 719                                                 return 3;
 720                                         }
 721                                         /* ch is idle, si and number matches */
 722                                         cc->rcard[ch] = card;
 723                                         cc->rch[ch] = lch;
 724                                         card->rcard[lch] = cc;
 725                                         card->rch[lch] = ch;
 726                                         restore_flags(flags);
 727                                         return 0;
 728                                 } else {
 729                                         restore_flags(flags);
 730                                         /* num matches, but busy */
 731                                         if (ch == 1)
 732                                                 return 1;
 733                                 }
 734                         }
 735                 }
 736                 cc = cc->next;
 737         }
 738         return 2;
 739 }
 740
 741 /*
 742  * Depending on D-channel protocol and caller/called, modify
 743  * phone number.
 744  *
 745  * Parameter:
 746  *   card   = pointer to card struct.
 747  *   phone  = pointer phone number.
 748  *   caller = flag: 1 = caller, 0 = called.
 749  * Return:
 750  *   pointer to new phone number.
 751  */
 752 static char *
 753 isdnloop_vstphone(isdnloop_card * card, char *phone, int caller)
 754 {
 755         int i;
 756         static char nphone[30];
 757
 758         if (!card) {
 759                 printk("BUG!!!\n");
 760                 return "";
 761         }
 762         switch (card->ptype) {
 763                 case ISDN_PTYPE_EURO:
 764                         if (caller) {
 765                                 for (i = 0; i < 2; i++)
 766                                         if (!(strcmp(card->s0num[i], phone)))
 767                                                 return (phone);
 768                                 return (card->s0num[0]);
 769                         }
 770                         return (phone);
 771                         break;
 772                 case ISDN_PTYPE_1TR6:
 773                         if (caller) {
 774                                 sprintf(nphone, "%s%c", card->s0num[0], phone[0]);
 775                                 return (nphone);
 776                         } else
 777                                 return (&phone[strlen(phone) - 1]);
 778                         break;
 779         }
 780         return "";
 781 }
 782
 783 /*
 784  * Parse an ICN-type command string sent to the 'card'.
 785  * Perform misc. actions depending on the command.
 786  *
 787  * Parameter:
 788  *   card = pointer to card struct.
 789  */
 790 static void
 791 isdnloop_parse_cmd(isdnloop_card * card)
 792 {
 793         char *p = card->omsg;
 794         isdn_ctrl cmd;
 795         char buf[60];
 796         isdnloop_stat *s = isdnloop_cmd_table;
 797         int action = -1;
 798         int i;
 799         int ch;
 800
 801         if ((card->omsg[0] != '0') && (card->omsg[2] != ';')) {
 802                 isdnloop_fake_err(card);
 803                 return;
 804         }
 805         ch = card->omsg[1] - '0';
 806         if ((ch < 0) || (ch > 2)) {
 807                 isdnloop_fake_err(card);
 808                 return;
 809         }
 810         p += 3;
 811         while (s->statstr) {
 812                 if (!strncmp(p, s->statstr, strlen(s->statstr))) {
 813                         action = s->action;
 814                         if (s->command && (ch != 0)) {
 815                                 isdnloop_fake_err(card);
 816                                 return;
 817                         }
 818                         break;
 819                 }
 820                 s++;
 821         }
 822         if (action == -1)
 823                 return;
 824         switch (action) {
 825                 case 1:
 826                         /* 0x;BCON_R */
 827                         if (card->rcard[ch - 1]) {
 828                                 isdnloop_fake(card->rcard[ch - 1], "BCON_I",
 829                                               card->rch[ch - 1] + 1);
 830                                 isdnloop_fake(card, "BCON_C", ch);
 831                         }
 832                         break;
 833                 case 17:
 834                         /* 0x;BCON_I */
 835                         if (card->rcard[ch - 1]) {
 836                                 isdnloop_fake(card->rcard[ch - 1], "BCON_C",
 837                                               card->rch[ch - 1] + 1);
 838                         }
 839                         break;
 840                 case 2:
 841                         /* 0x;BDIS_R */
 842                         isdnloop_fake(card, "BDIS_C", ch);
 843                         if (card->rcard[ch - 1]) {
 844                                 isdnloop_fake(card->rcard[ch - 1], "BDIS_I",
 845                                               card->rch[ch - 1] + 1);
 846                         }
 847                         break;
 848                 case 16:
 849                         /* 0x;DCON_R */
 850                         isdnloop_kill_ctimer(card, ch - 1);
 851                         if (card->rcard[ch - 1]) {
 852                                 isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
 853                                 isdnloop_fake(card->rcard[ch - 1], "DCON_C",
 854                                               card->rch[ch - 1] + 1);
 855                                 isdnloop_fake(card, "DCON_C", ch);
 856                         }
 857                         break;
 858                 case 3:
 859                         /* 0x;DDIS_R */
 860                         isdnloop_kill_ctimer(card, ch - 1);
 861                         if (card->rcard[ch - 1]) {
 862                                 isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
 863                                 isdnloop_fake(card->rcard[ch - 1], "DDIS_I",
 864                                               card->rch[ch - 1] + 1);
 865                                 card->rcard[ch - 1] = NULL;
 866                         }
 867                         isdnloop_fake(card, "DDIS_C", ch);
 868                         break;
 869                 case 4:
 870                         /* 0x;DSCA_Rdd,yy,zz,oo */
 871                         if (card->ptype != ISDN_PTYPE_1TR6) {
 872                                 isdnloop_fake_err(card);
 873                                 return;
 874                         }
 875                         /* Fall through */
 876                 case 5:
 877                         /* 0x;DCAL_Rdd,yy,zz,oo */
 878                         p += 6;
 879                         switch (isdnloop_try_call(card, p, ch - 1, &cmd)) {
 880                                 case 0:
 881                                         /* Alerting */
 882                                         sprintf(buf, "D%s_I%s,%02d,%02d,%s",
 883                                            (action == 4) ? "SCA" : "CAL",
 884                                                 isdnloop_vstphone(card, cmd.parm.setup.eazmsn, 1),
 885                                                 cmd.parm.setup.si1,
 886                                                 cmd.parm.setup.si2,
 887                                         isdnloop_vstphone(card->rcard[ch - 1],
 888                                                cmd.parm.setup.phone, 0));
 889                                         isdnloop_fake(card->rcard[ch - 1], buf, card->rch[ch - 1] + 1);
 890                                         /* Fall through */
 891                                 case 3:
 892                                         /* si1 does not match, don't alert but start timer */
 893                                         isdnloop_start_ctimer(card, ch - 1);
 894                                         break;
 895                                 case 1:
 896                                         /* Remote busy */
 897                                         isdnloop_fake(card, "DDIS_I", ch);
 898                                         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 1));
 899                                         isdnloop_fake(card, buf, ch);
 900                                         break;
 901                                 case 2:
 902                                         /* No such user */
 903                                         isdnloop_fake(card, "DDIS_I", ch);
 904                                         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 2));
 905                                         isdnloop_fake(card, buf, ch);
 906                                         break;
 907                         }
 908                         break;
 909                 case 6:
 910                         /* 0x;EAZC */
 911                         card->eazlist[ch - 1][0] = '\0';
 912                         break;
 913                 case 7:
 914                         /* 0x;EAZ */
 915                         p += 3;
 916                         strcpy(card->eazlist[ch - 1], p);
 917                         break;
 918                 case 8:
 919                         /* 0x;SEEAZ */
 920                         sprintf(buf, "EAZ-LIST: %s", card->eazlist[ch - 1]);
 921                         isdnloop_fake(card, buf, ch + 1);
 922                         break;
 923                 case 9:
 924                         /* 0x;MSN */
 925                         break;
 926                 case 10:
 927                         /* 0x;MSNALL */
 928                         break;
 929                 case 11:
 930                         /* 0x;SETSIL */
 931                         p += 6;
 932                         i = 0;
 933                         while (strchr("0157", *p)) {
 934                                 if (i)
 935                                         card->sil[ch - 1] |= si2bit[*p - '0'];
 936                                 i = (*p++ == '0');
 937                         }
 938                         if (*p)
 939                                 isdnloop_fake_err(card);
 940                         break;
 941                 case 12:
 942                         /* 0x;SEESIL */
 943                         sprintf(buf, "SIN-LIST: ");
 944                         p = buf + 10;
 945                         for (i = 0; i < 3; i++)
 946                                 if (card->sil[ch - 1] & (1 << i))
 947                                         p += sprintf(p, "%02d", bit2si[i]);
 948                         isdnloop_fake(card, buf, ch + 1);
 949                         break;
 950                 case 13:
 951                         /* 0x;SILC */
 952                         card->sil[ch - 1] = 0;
 953                         break;
 954                 case 14:
 955                         /* 00;FV2ON */
 956                         break;
 957                 case 15:
 958                         /* 00;FV2OFF */
 959                         break;
 960         }
 961 }
 962
 963 /*
 964  * Put command-strings into the of the 'card'. In reality, execute them
 965  * right in place by calling isdnloop_parse_cmd(). Also copy every
 966  * command to the read message ringbuffer, preceeding it with a '>'.
 967  * These mesagges can be read at /dev/isdnctrl.
 968  *
 969  * Parameter:
 970  *   buf  = pointer to command buffer.
 971  *   len  = length of buffer data.
 972  *   user = flag: 1 = called form userlevel, 0 called from kernel.
 973  *   card = pointer to card struct.
 974  * Return:
 975  *   number of bytes transferred (currently always equals len).
 976  */
 977 static int
 978 isdnloop_writecmd(const u_char * buf, int len, int user, isdnloop_card * card)
 979 {
 980         int xcount = 0;
 981         int ocount = 1;
 982         isdn_ctrl cmd;
 983
 984         while (len) {
 985                 int count = len;
 986                 u_char *p;
 987                 u_char msg[0x100];
 988
 989                 if (count > 255)
 990                         count = 255;
 991                 if (user) {
 992                         if (copy_from_user(msg, buf, count))
 993                                 return -EFAULT;
 994                 } else
 995                         memcpy(msg, buf, count);
 996                 isdnloop_putmsg(card, '>');
 997                 for (p = msg; count > 0; count--, p++) {
 998                         len--;
 999                         xcount++;
1000                         isdnloop_putmsg(card, *p);
1001                         card->omsg[card->optr] = *p;
1002                         if (*p == '\n') {
1003                                 card->omsg[card->optr] = '\0';
1004                                 card->optr = 0;
1005                                 isdnloop_parse_cmd(card);
1006                                 if (len) {
1007                                         isdnloop_putmsg(card, '>');
1008                                         ocount++;
1009                                 }
1010                         } else {
1011                                 if (card->optr < 59)
1012                                         card->optr++;
1013                         }
1014                         ocount++;
1015                 }
1016         }
1017         cmd.command = ISDN_STAT_STAVAIL;
1018         cmd.driver = card->myid;
1019         cmd.arg = ocount;
1020         card->interface.statcallb(&cmd);
1021         return xcount;
1022 }
1023
1024 /*
1025  * Delete card's pending timers, send STOP to linklevel
1026  */
1027 static void
1028 isdnloop_stopcard(isdnloop_card * card)
1029 {
1030         unsigned long flags;
1031         isdn_ctrl cmd;
1032
1033         save_flags(flags);
1034         cli();
1035         if (card->flags & ISDNLOOP_FLAGS_RUNNING) {
1036                 card->flags &= ~ISDNLOOP_FLAGS_RUNNING;
1037                 del_timer(&card->st_timer);
1038                 del_timer(&card->rb_timer);
1039                 del_timer(&card->c_timer[0]);
1040                 del_timer(&card->c_timer[1]);
1041                 cmd.command = ISDN_STAT_STOP;
1042                 cmd.driver = card->myid;
1043                 card->interface.statcallb(&cmd);
1044         }
1045         restore_flags(flags);
1046 }
1047
1048 /*
1049  * Stop all cards before unload.
1050  */
1051 static void
1052 isdnloop_stopallcards(void)
1053 {
1054         isdnloop_card *p = cards;
1055
1056         while (p) {
1057                 isdnloop_stopcard(p);
1058                 p = p->next;
1059         }
1060 }
1061
1062 /*
1063  * Start a 'card'. Simulate card's boot message and set the phone
1064  * number(s) of the virtual 'S0-Interface'. Install D-channel
1065  * poll timer.
1066  *
1067  * Parameter:
1068  *   card  = pointer to card struct.
1069  *   sdefp = pointer to struct holding ioctl parameters.
1070  * Return:
1071  *   0 on success, -E??? otherwise.
1072  */
1073 static int
1074 isdnloop_start(isdnloop_card * card, isdnloop_sdef * sdefp)
1075 {
1076         unsigned long flags;
1077         isdnloop_sdef sdef;
1078         int i;
1079
1080         if (card->flags & ISDNLOOP_FLAGS_RUNNING)
1081                 return -EBUSY;
1082         if (copy_from_user((char *) &sdef, (char *) sdefp, sizeof(sdef)))
1083                 return -EFAULT;
1084         save_flags(flags);
1085         cli();
1086         switch (sdef.ptype) {
1087                 case ISDN_PTYPE_EURO:
1088                         if (isdnloop_fake(card, "DRV1.23EC-Q.931-CAPI-CNS-BASIS-20.02.96",
1089                                           -1)) {
1090                                 restore_flags(flags);
1091                                 return -ENOMEM;
1092                         }
1093                         card->sil[0] = card->sil[1] = 4;
1094                         if (isdnloop_fake(card, "TEI OK", 0)) {
1095                                 restore_flags(flags);
1096                                 return -ENOMEM;
1097                         }
1098                         for (i = 0; i < 3; i++)
1099                                 strcpy(card->s0num[i], sdef.num[i]);
1100                         break;
1101                 case ISDN_PTYPE_1TR6:
1102                         if (isdnloop_fake(card, "DRV1.04TC-1TR6-CAPI-CNS-BASIS-29.11.95",
1103                                           -1)) {
1104                                 restore_flags(flags);
1105                                 return -ENOMEM;
1106                         }
1107                         card->sil[0] = card->sil[1] = 4;
1108                         if (isdnloop_fake(card, "TEI OK", 0)) {
1109                                 restore_flags(flags);
1110                                 return -ENOMEM;
1111                         }
1112                         strcpy(card->s0num[0], sdef.num[0]);
1113                         card->s0num[1][0] = '\0';
1114                         card->s0num[2][0] = '\0';
1115                         break;
1116                 default:
1117                         restore_flags(flags);
1118                         printk(KERN_WARNING "isdnloop: Illegal D-channel protocol %d\n",
1119                                sdef.ptype);
1120                         return -EINVAL;
1121         }
1122         init_timer(&card->st_timer);
1123         card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
1124         card->st_timer.function = isdnloop_polldchan;
1125         card->st_timer.data = (unsigned long) card;
1126         add_timer(&card->st_timer);
1127         card->flags |= ISDNLOOP_FLAGS_RUNNING;
1128         restore_flags(flags);
1129         return 0;
1130 }
1131
1132 /*
1133  * Main handler for commands sent by linklevel.
1134  */
1135 static int
1136 isdnloop_command(isdn_ctrl * c, isdnloop_card * card)
1137 {
1138         ulong a;
1139         int i;
1140         char cbuf[60];
1141         isdn_ctrl cmd;
1142         isdnloop_cdef cdef;
1143
1144         switch (c->command) {
1145                 case ISDN_CMD_IOCTL:
1146                         memcpy(&a, c->parm.num, sizeof(ulong));
1147                         switch (c->arg) {
1148                                 case ISDNLOOP_IOCTL_DEBUGVAR:
1149                                         return (ulong) card;
1150                                 case ISDNLOOP_IOCTL_STARTUP:
1151                                         if ((i = verify_area(VERIFY_READ, (void *) a, sizeof(isdnloop_sdef))))
1152                                                 return i;
1153                                         return (isdnloop_start(card, (isdnloop_sdef *) a));
1154                                         break;
1155                                 case ISDNLOOP_IOCTL_ADDCARD:
1156                                         if (copy_from_user((char *)&cdef,
1157                                                            (char *)a,
1158                                                            sizeof(cdef)))
1159                                                 return -EFAULT;
1160                                         return (isdnloop_addcard(cdef.id1));
1161                                         break;
1162                                 case ISDNLOOP_IOCTL_LEASEDCFG:
1163                                         if (a) {
1164                                                 if (!card->leased) {
1165                                                         card->leased = 1;
1166                                                         while (card->ptype == ISDN_PTYPE_UNKNOWN) {
1167                                                                 schedule_timeout(10);
1168                                                         }
1169                                                         schedule_timeout(10);
1170                                                         sprintf(cbuf, "00;FV2ON\n01;EAZ1\n02;EAZ2\n");
1171                                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1172                                                         printk(KERN_INFO
1173                                                                "isdnloop: (%s) Leased-line mode enabled\n",
1174                                                                CID);
1175                                                         cmd.command = ISDN_STAT_RUN;
1176                                                         cmd.driver = card->myid;
1177                                                         cmd.arg = 0;
1178                                                         card->interface.statcallb(&cmd);
1179                                                 }
1180                                         } else {
1181                                                 if (card->leased) {
1182                                                         card->leased = 0;
1183                                                         sprintf(cbuf, "00;FV2OFF\n");
1184                                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1185                                                         printk(KERN_INFO
1186                                                                "isdnloop: (%s) Leased-line mode disabled\n",
1187                                                                CID);
1188                                                         cmd.command = ISDN_STAT_RUN;
1189                                                         cmd.driver = card->myid;
1190                                                         cmd.arg = 0;
1191                                                         card->interface.statcallb(&cmd);
1192                                                 }
1193                                         }
1194                                         return 0;
1195                                 default:
1196                                         return -EINVAL;
1197                         }
1198                         break;
1199                 case ISDN_CMD_DIAL:
1200                         if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1201                                 return -ENODEV;
1202                         if (card->leased)
1203                                 break;
1204                         if ((c->arg & 255) < ISDNLOOP_BCH) {
1205                                 char *p;
1206                                 char dial[50];
1207                                 char dcode[4];
1208
1209                                 a = c->arg;
1210                                 p = c->parm.setup.phone;
1211                                 if (*p == 's' || *p == 'S') {
1212                                         /* Dial for SPV */
1213                                         p++;
1214                                         strcpy(dcode, "SCA");
1215                                 } else
1216                                         /* Normal Dial */
1217                                         strcpy(dcode, "CAL");
1218                                 strcpy(dial, p);
1219                                 sprintf(cbuf, "%02d;D%s_R%s,%02d,%02d,%s\n", (int) (a + 1),
1220                                         dcode, dial, c->parm.setup.si1,
1221                                 c->parm.setup.si2, c->parm.setup.eazmsn);
1222                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1223                         }
1224                         break;
1225                 case ISDN_CMD_ACCEPTD:
1226                         if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1227                                 return -ENODEV;
1228                         if (c->arg < ISDNLOOP_BCH) {
1229                                 a = c->arg + 1;
1230                                 cbuf[0] = 0;
1231                                 switch (card->l2_proto[a - 1]) {
1232                                         case ISDN_PROTO_L2_X75I:
1233                                                 sprintf(cbuf, "%02d;BX75\n", (int) a);
1234                                                 break;
1235 #ifdef CONFIG_ISDN_X25
1236                                         case ISDN_PROTO_L2_X25DTE:
1237                                                 sprintf(cbuf, "%02d;BX2T\n", (int) a);
1238                                                 break;
1239                                         case ISDN_PROTO_L2_X25DCE:
1240                                                 sprintf(cbuf, "%02d;BX2C\n", (int) a);
1241                                                 break;
1242 #endif
1243                                         case ISDN_PROTO_L2_HDLC:
1244                                                 sprintf(cbuf, "%02d;BTRA\n", (int) a);
1245                                                 break;
1246                                 }
1247                                 if (strlen(cbuf))
1248                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1249                                 sprintf(cbuf, "%02d;DCON_R\n", (int) a);
1250                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1251                         }
1252                         break;
1253                 case ISDN_CMD_ACCEPTB:
1254                         if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1255                                 return -ENODEV;
1256                         if (c->arg < ISDNLOOP_BCH) {
1257                                 a = c->arg + 1;
1258                                 switch (card->l2_proto[a - 1]) {
1259                                         case ISDN_PROTO_L2_X75I:
1260                                                 sprintf(cbuf, "%02d;BCON_R,BX75\n", (int) a);
1261                                                 break;
1262 #ifdef CONFIG_ISDN_X25
1263                                         case ISDN_PROTO_L2_X25DTE:
1264                                                 sprintf(cbuf, "%02d;BCON_R,BX2T\n", (int) a);
1265                                                 break;
1266                                         case ISDN_PROTO_L2_X25DCE:
1267                                                 sprintf(cbuf, "%02d;BCON_R,BX2C\n", (int) a);
1268                                                 break;
1269 #endif
1270                                         case ISDN_PROTO_L2_HDLC:
1271                                                 sprintf(cbuf, "%02d;BCON_R,BTRA\n", (int) a);
1272                                                 break;
1273                                         default:
1274                                                 sprintf(cbuf, "%02d;BCON_R\n", (int) a);
1275                                 }
1276                                 printk(KERN_DEBUG "isdnloop writecmd '%s'\n", cbuf);
1277                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1278                                 break;
1279                 case ISDN_CMD_HANGUP:
1280                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1281                                         return -ENODEV;
1282                                 if (c->arg < ISDNLOOP_BCH) {
1283                                         a = c->arg + 1;
1284                                         sprintf(cbuf, "%02d;BDIS_R\n%02d;DDIS_R\n", (int) a, (int) a);
1285                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1286                                 }
1287                                 break;
1288                 case ISDN_CMD_SETEAZ:
1289                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1290                                         return -ENODEV;
1291                                 if (card->leased)
1292                                         break;
1293                                 if (c->arg < ISDNLOOP_BCH) {
1294                                         a = c->arg + 1;
1295                                         if (card->ptype == ISDN_PTYPE_EURO) {
1296                                                 sprintf(cbuf, "%02d;MS%s%s\n", (int) a,
1297                                                         c->parm.num[0] ? "N" : "ALL", c->parm.num);
1298                                         } else
1299                                                 sprintf(cbuf, "%02d;EAZ%s\n", (int) a,
1300                                                         c->parm.num[0] ? c->parm.num : (u_char *) "0123456789");
1301                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1302                                 }
1303                                 break;
1304                 case ISDN_CMD_CLREAZ:
1305                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1306                                         return -ENODEV;
1307                                 if (card->leased)
1308                                         break;
1309                                 if (c->arg < ISDNLOOP_BCH) {
1310                                         a = c->arg + 1;
1311                                         if (card->ptype == ISDN_PTYPE_EURO)
1312                                                 sprintf(cbuf, "%02d;MSNC\n", (int) a);
1313                                         else
1314                                                 sprintf(cbuf, "%02d;EAZC\n", (int) a);
1315                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1316                                 }
1317                                 break;
1318                 case ISDN_CMD_SETL2:
1319                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1320                                         return -ENODEV;
1321                                 if ((c->arg & 255) < ISDNLOOP_BCH) {
1322                                         a = c->arg;
1323                                         switch (a >> 8) {
1324                                                 case ISDN_PROTO_L2_X75I:
1325                                                         sprintf(cbuf, "%02d;BX75\n", (int) (a & 255) + 1);
1326                                                         break;
1327 #ifdef CONFIG_ISDN_X25
1328                                                 case ISDN_PROTO_L2_X25DTE:
1329                                                         sprintf(cbuf, "%02d;BX2T\n", (int) (a & 255) + 1);
1330                                                         break;
1331                                                 case ISDN_PROTO_L2_X25DCE:
1332                                                         sprintf(cbuf, "%02d;BX2C\n", (int) (a & 255) + 1);
1333                                                         break;
1334 #endif
1335                                                 case ISDN_PROTO_L2_HDLC:
1336                                                         sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1337                                                         break;
1338                                                 case ISDN_PROTO_L2_TRANS:
1339                                                         sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1340                                                         break;
1341                                                 default:
1342                                                         return -EINVAL;
1343                                         }
1344                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1345                                         card->l2_proto[a & 255] = (a >> 8);
1346                                 }
1347                                 break;
1348                 case ISDN_CMD_SETL3:
1349                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1350                                         return -ENODEV;
1351                                 return 0;
1352                 default:
1353                                 return -EINVAL;
1354                         }
1355         }
1356         return 0;
1357 }
1358
1359 /*
1360  * Find card with given driverId
1361  */
1362 static inline isdnloop_card *
1363 isdnloop_findcard(int driverid)
1364 {
1365         isdnloop_card *p = cards;
1366
1367         while (p) {
1368                 if (p->myid == driverid)
1369                         return p;
1370                 p = p->next;
1371         }
1372         return (isdnloop_card *) 0;
1373 }
1374
1375 /*
1376  * Wrapper functions for interface to linklevel
1377  */
1378 static int
1379 if_command(isdn_ctrl * c)
1380 {
1381         isdnloop_card *card = isdnloop_findcard(c->driver);
1382
1383         if (card)
1384                 return (isdnloop_command(c, card));
1385         printk(KERN_ERR
1386                "isdnloop: if_command called with invalid driverId!\n");
1387         return -ENODEV;
1388 }
1389
1390 static int
1391 if_writecmd(const u_char * buf, int len, int user, int id, int channel)
1392 {
1393         isdnloop_card *card = isdnloop_findcard(id);
1394
1395         if (card) {
1396                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1397                         return -ENODEV;
1398                 return (isdnloop_writecmd(buf, len, user, card));
1399         }
1400         printk(KERN_ERR
1401                "isdnloop: if_writecmd called with invalid driverId!\n");
1402         return -ENODEV;
1403 }
1404
1405 static int
1406 if_readstatus(u_char * buf, int len, int user, int id, int channel)
1407 {
1408         isdnloop_card *card = isdnloop_findcard(id);
1409
1410         if (card) {
1411                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1412                         return -ENODEV;
1413                 return (isdnloop_readstatus(buf, len, user, card));
1414         }
1415         printk(KERN_ERR
1416                "isdnloop: if_readstatus called with invalid driverId!\n");
1417         return -ENODEV;
1418 }
1419
1420 static int
1421 if_sendbuf(int id, int channel, int ack, struct sk_buff *skb)
1422 {
1423         isdnloop_card *card = isdnloop_findcard(id);
1424
1425         if (card) {
1426                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1427                         return -ENODEV;
1428                 /* ack request stored in skb scratch area */
1429                 *(skb->head) = ack;
1430                 return (isdnloop_sendbuf(channel, skb, card));
1431         }
1432         printk(KERN_ERR
1433                "isdnloop: if_sendbuf called with invalid driverId!\n");
1434         return -ENODEV;
1435 }
1436
1437 /*
1438  * Allocate a new card-struct, initialize it
1439  * link it into cards-list and register it at linklevel.
1440  */
1441 static isdnloop_card *
1442 isdnloop_initcard(char *id)
1443 {
1444         isdnloop_card *card;
1445         int i;
1446
1447         if (!(card = (isdnloop_card *) kmalloc(sizeof(isdnloop_card), GFP_KERNEL))) {
1448                 printk(KERN_WARNING
1449                  "isdnloop: (%s) Could not allocate card-struct.\n", id);
1450                 return (isdnloop_card *) 0;
1451         }
1452         memset((char *) card, 0, sizeof(isdnloop_card));
1453         card->interface.owner = THIS_MODULE;
1454         card->interface.channels = ISDNLOOP_BCH;
1455         card->interface.hl_hdrlen  = 1; /* scratch area for storing ack flag*/
1456         card->interface.maxbufsize = 4000;
1457         card->interface.command = if_command;
1458         card->interface.writebuf_skb = if_sendbuf;
1459         card->interface.writecmd = if_writecmd;
1460         card->interface.readstat = if_readstatus;
1461         card->interface.features = ISDN_FEATURE_L2_X75I |
1462 #ifdef CONFIG_ISDN_X25
1463             ISDN_FEATURE_L2_X25DTE |
1464             ISDN_FEATURE_L2_X25DCE |
1465 #endif
1466             ISDN_FEATURE_L2_HDLC |
1467             ISDN_FEATURE_L3_TRANS |
1468             ISDN_FEATURE_P_UNKNOWN;
1469         card->ptype = ISDN_PTYPE_UNKNOWN;
1470         strlcpy(card->interface.id, id, sizeof(card->interface.id));
1471         card->msg_buf_write = card->msg_buf;
1472         card->msg_buf_read = card->msg_buf;
1473         card->msg_buf_end = &card->msg_buf[sizeof(card->msg_buf) - 1];
1474         for (i = 0; i < ISDNLOOP_BCH; i++) {
1475                 card->l2_proto[i] = ISDN_PROTO_L2_X75I;
1476                 skb_queue_head_init(&card->bqueue[i]);
1477         }
1478         skb_queue_head_init(&card->dqueue);
1479         card->next = cards;
1480         cards = card;
1481         if (!register_isdn(&card->interface)) {
1482                 cards = cards->next;
1483                 printk(KERN_WARNING
1484                        "isdnloop: Unable to register %s\n", id);
1485                 kfree(card);
1486                 return (isdnloop_card *) 0;
1487         }
1488         card->myid = card->interface.channels;
1489         return card;
1490 }
1491
1492 static int
1493 isdnloop_addcard(char *id1)
1494 {
1495         isdnloop_card *card;
1496
1497         if (!(card = isdnloop_initcard(id1))) {
1498                 return -EIO;
1499         }
1500         printk(KERN_INFO
1501                "isdnloop: (%s) virtual card added\n",
1502                card->interface.id);
1503         return 0;
1504 }
1505
1506 static int __init
1507 isdnloop_init(void)
1508 {
1509         char *p;
1510         char rev[10];
1511
1512         if ((p = strchr(revision, ':'))) {
1513                 strcpy(rev, p + 1);
1514                 p = strchr(rev, '$');
1515                 *p = 0;
1516         } else
1517                 strcpy(rev, " ??? ");
1518         printk(KERN_NOTICE "isdnloop-ISDN-driver Rev%s\n", rev);
1519
1520         if (isdnloop_id)
1521                 return (isdnloop_addcard(isdnloop_id));
1522
1523         return 0;
1524 }
1525
1526 static void __exit
1527 isdnloop_exit(void)
1528 {
1529         isdn_ctrl cmd;
1530         isdnloop_card *card = cards;
1531         isdnloop_card *last;
1532         int i;
1533
1534         isdnloop_stopallcards();
1535         while (card) {
1536                 cmd.command = ISDN_STAT_UNLOAD;
1537                 cmd.driver = card->myid;
1538                 card->interface.statcallb(&cmd);
1539                 for (i = 0; i < ISDNLOOP_BCH; i++)
1540                         isdnloop_free_queue(card, i);
1541                 card = card->next;
1542         }
1543         card = cards;
1544         while (card) {
1545                 last = card;
1546                 skb_queue_purge(&card->dqueue);
1547                 card = card->next;
1548                 kfree(last);
1549         }
1550         printk(KERN_NOTICE "isdnloop-ISDN-driver unloaded\n");
1551 }
1552
1553 module_init(isdnloop_init);
1554 module_exit(isdnloop_exit);