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