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