drivers/isdn/isdnloop/isdnloop.c

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