git.oblomov.eu Git - linux-2.6/blob - drivers/isdn/isdnloop/isdnloop.c

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