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   1 /*
   2  * Stuff used by all variants of the driver
   3  *
   4  * Copyright (c) 2001 by Stefan Eilers (Eilers.Stefan@epost.de),
   5  *                       Hansjoerg Lipp (hjlipp@web.de),
   6  *                       Tilman Schmidt (tilman@imap.cc).
   7  *
   8  * =====================================================================
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License as
  11  *      published by the Free Software Foundation; either version 2 of
  12  *      the License, or (at your option) any later version.
  13  * =====================================================================
  14  * ToDo: ...
  15  * =====================================================================
  16  * Version: $Id: i4l.c,v 1.3.2.9 2006/02/04 18:28:16 hjlipp Exp $
  17  * =====================================================================
  18  */
  19
  20 #include "gigaset.h"
  21
  22 /* == Handling of I4L IO ============================================================================*/
  23
  24 /* writebuf_from_LL
  25  * called by LL to transmit data on an open channel
  26  * inserts the buffer data into the send queue and starts the transmission
  27  * Note that this operation must not sleep!
  28  * When the buffer is processed completely, gigaset_skb_sent() should be called.
  29  * parameters:
  30  *      driverID        driver ID as assigned by LL
  31  *      channel         channel number
  32  *      ack             if != 0 LL wants to be notified on completion via statcallb(ISDN_STAT_BSENT)
  33  *      skb             skb containing data to send
  34  * return value:
  35  *      number of accepted bytes
  36  *      0 if temporarily unable to accept data (out of buffer space)
  37  *      <0 on error (eg. -EINVAL)
  38  */
  39 static int writebuf_from_LL(int driverID, int channel, int ack, struct sk_buff *skb)
  40 {
  41         struct cardstate *cs;
  42         struct bc_state *bcs;
  43         unsigned len;
  44         unsigned skblen;
  45
  46         if (!(cs = gigaset_get_cs_by_id(driverID))) {
  47                 err("%s: invalid driver ID (%d)", __func__, driverID);
  48                 return -ENODEV;
  49         }
  50         if (channel < 0 || channel >= cs->channels) {
  51                 err("%s: invalid channel ID (%d)", __func__, channel);
  52                 return -ENODEV;
  53         }
  54         bcs = &cs->bcs[channel];
  55         len = skb->len;
  56
  57         dbg(DEBUG_LLDATA,
  58             "Receiving data from LL (id: %d, channel: %d, ack: %d, size: %d)",
  59             driverID, channel, ack, len);
  60
  61         if (!len) {
  62                 if (ack)
  63                         warn("not ACKing empty packet from LL");
  64                 return 0;
  65         }
  66         if (len > MAX_BUF_SIZE) {
  67                 err("%s: packet too large (%d bytes)", __func__, channel);
  68                 return -EINVAL;
  69         }
  70
  71         if (!atomic_read(&cs->connected))
  72                 return -ENODEV;
  73
  74         skblen = ack ? len : 0;
  75         skb->head[0] = skblen & 0xff;
  76         skb->head[1] = skblen >> 8;
  77         dbg(DEBUG_MCMD, "skb: len=%u, skblen=%u: %02x %02x", len, skblen,
  78              (unsigned) skb->head[0], (unsigned) skb->head[1]);
  79
  80         /* pass to device-specific module */
  81         return cs->ops->send_skb(bcs, skb);
  82 }
  83
  84 void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb)
  85 {
  86         unsigned len;
  87         isdn_ctrl response;
  88
  89         ++bcs->trans_up;
  90
  91         if (skb->len)
  92                 warn("%s: skb->len==%d", __func__, skb->len);
  93
  94         len = (unsigned char) skb->head[0] |
  95               (unsigned) (unsigned char) skb->head[1] << 8;
  96         if (len) {
  97                 dbg(DEBUG_MCMD,
  98                     "Acknowledge sending to LL (id: %d, channel: %d size: %u)",
  99                     bcs->cs->myid, bcs->channel, len);
 100
 101                 response.driver = bcs->cs->myid;
 102                 response.command = ISDN_STAT_BSENT;
 103                 response.arg = bcs->channel;
 104                 response.parm.length = len;
 105                 bcs->cs->iif.statcallb(&response);
 106         }
 107 }
 108 EXPORT_SYMBOL_GPL(gigaset_skb_sent);
 109
 110 /* This function will be called by LL to send commands
 111  * NOTE: LL ignores the returned value, for commands other than ISDN_CMD_IOCTL,
 112  * so don't put too much effort into it.
 113  */
 114 static int command_from_LL(isdn_ctrl *cntrl)
 115 {
 116         struct cardstate *cs = gigaset_get_cs_by_id(cntrl->driver);
 117         //isdn_ctrl response;
 118         //unsigned long flags;
 119         struct bc_state *bcs;
 120         int retval = 0;
 121         struct setup_parm *sp;
 122
 123         //dbg(DEBUG_ANY, "Gigaset_HW: Receiving command");
 124         gigaset_debugdrivers();
 125
 126         /* Terminate this call if no device is present. Bt if the command is "ISDN_CMD_LOCK" or
 127          * "ISDN_CMD_UNLOCK" then execute it due to the fact that they are device independent !
 128          */
 129         //FIXME "remove test for &connected"
 130         if ((!cs || !atomic_read(&cs->connected))) {
 131                 warn("LL tried to access unknown device with nr. %d",
 132                      cntrl->driver);
 133                 return -ENODEV;
 134         }
 135
 136         switch (cntrl->command) {
 137         case ISDN_CMD_IOCTL:
 138
 139                 dbg(DEBUG_ANY, "ISDN_CMD_IOCTL (driver:%d,arg: %ld)",
 140                     cntrl->driver, cntrl->arg);
 141
 142                 warn("ISDN_CMD_IOCTL is not supported.");
 143                 return -EINVAL;
 144
 145         case ISDN_CMD_DIAL:
 146                 dbg(DEBUG_ANY, "ISDN_CMD_DIAL (driver: %d, channel: %ld, "
 147                     "phone: %s,ownmsn: %s, si1: %d, si2: %d)",
 148                     cntrl->driver, cntrl->arg,
 149                     cntrl->parm.setup.phone, cntrl->parm.setup.eazmsn,
 150                     cntrl->parm.setup.si1, cntrl->parm.setup.si2);
 151
 152                 if (cntrl->arg >= cs->channels) {
 153                         err("invalid channel (%d)", (int) cntrl->arg);
 154                         return -EINVAL;
 155                 }
 156
 157                 bcs = cs->bcs + cntrl->arg;
 158
 159                 if (!gigaset_get_channel(bcs)) {
 160                         err("channel not free");
 161                         return -EBUSY;
 162                 }
 163
 164                 sp = kmalloc(sizeof *sp, GFP_ATOMIC);
 165                 if (!sp) {
 166                         gigaset_free_channel(bcs);
 167                         err("ISDN_CMD_DIAL: out of memory");
 168                         return -ENOMEM;
 169                 }
 170                 *sp = cntrl->parm.setup;
 171
 172                 if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, sp,
 173                                        atomic_read(&bcs->at_state.seq_index),
 174                                        NULL)) {
 175                         //FIXME what should we do?
 176                         kfree(sp);
 177                         gigaset_free_channel(bcs);
 178                         return -ENOMEM;
 179                 }
 180
 181                 dbg(DEBUG_CMD, "scheduling DIAL");
 182                 gigaset_schedule_event(cs);
 183                 break;
 184         case ISDN_CMD_ACCEPTD: //FIXME
 185                 dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTD");
 186
 187                 if (cntrl->arg >= cs->channels) {
 188                         err("invalid channel (%d)", (int) cntrl->arg);
 189                         return -EINVAL;
 190                 }
 191
 192                 if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg].at_state,
 193                                        EV_ACCEPT, NULL, 0, NULL)) {
 194                         //FIXME what should we do?
 195                         return -ENOMEM;
 196                 }
 197
 198                 dbg(DEBUG_CMD, "scheduling ACCEPT");
 199                 gigaset_schedule_event(cs);
 200
 201                 break;
 202         case ISDN_CMD_ACCEPTB:
 203                 dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTB");
 204                 break;
 205         case ISDN_CMD_HANGUP:
 206                 dbg(DEBUG_ANY,
 207                     "ISDN_CMD_HANGUP (channel: %d)", (int) cntrl->arg);
 208
 209                 if (cntrl->arg >= cs->channels) {
 210                         err("ISDN_CMD_HANGUP: invalid channel (%u)",
 211                             (unsigned) cntrl->arg);
 212                         return -EINVAL;
 213                 }
 214
 215                 if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg].at_state,
 216                                        EV_HUP, NULL, 0, NULL)) {
 217                         //FIXME what should we do?
 218                         return -ENOMEM;
 219                 }
 220
 221                 dbg(DEBUG_CMD, "scheduling HUP");
 222                 gigaset_schedule_event(cs);
 223
 224                 break;
 225         case ISDN_CMD_CLREAZ:               /* Do not signal incoming signals */ //FIXME
 226                 dbg(DEBUG_ANY, "ISDN_CMD_CLREAZ");
 227                 break;
 228         case ISDN_CMD_SETEAZ:               /* Signal incoming calls for given MSN */ //FIXME
 229                 dbg(DEBUG_ANY,
 230                     "ISDN_CMD_SETEAZ (id:%d, channel: %ld, number: %s)",
 231                     cntrl->driver, cntrl->arg, cntrl->parm.num);
 232                 break;
 233         case ISDN_CMD_SETL2:                /* Set L2 to given protocol */
 234                 dbg(DEBUG_ANY, "ISDN_CMD_SETL2 (Channel: %ld, Proto: %lx)",
 235                      cntrl->arg & 0xff, (cntrl->arg >> 8));
 236
 237                 if ((cntrl->arg & 0xff) >= cs->channels) {
 238                         err("invalid channel (%u)",
 239                             (unsigned) cntrl->arg & 0xff);
 240                         return -EINVAL;
 241                 }
 242
 243                 if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg & 0xff].at_state,
 244                                        EV_PROTO_L2, NULL, cntrl->arg >> 8,
 245                                        NULL)) {
 246                         //FIXME what should we do?
 247                         return -ENOMEM;
 248                 }
 249
 250                 dbg(DEBUG_CMD, "scheduling PROTO_L2");
 251                 gigaset_schedule_event(cs);
 252                 break;
 253         case ISDN_CMD_SETL3:              /* Set L3 to given protocol */
 254                 dbg(DEBUG_ANY, "ISDN_CMD_SETL3 (Channel: %ld, Proto: %lx)",
 255                      cntrl->arg & 0xff, (cntrl->arg >> 8));
 256
 257                 if ((cntrl->arg & 0xff) >= cs->channels) {
 258                         err("invalid channel (%u)",
 259                             (unsigned) cntrl->arg & 0xff);
 260                         return -EINVAL;
 261                 }
 262
 263                 if (cntrl->arg >> 8 != ISDN_PROTO_L3_TRANS) {
 264                         err("invalid protocol %lu", cntrl->arg >> 8);
 265                         return -EINVAL;
 266                 }
 267
 268                 break;
 269         case ISDN_CMD_PROCEED:
 270                 dbg(DEBUG_ANY, "ISDN_CMD_PROCEED"); //FIXME
 271                 break;
 272         case ISDN_CMD_ALERT:
 273                 dbg(DEBUG_ANY, "ISDN_CMD_ALERT"); //FIXME
 274                 if (cntrl->arg >= cs->channels) {
 275                         err("invalid channel (%d)", (int) cntrl->arg);
 276                         return -EINVAL;
 277                 }
 278                 //bcs = cs->bcs + cntrl->arg;
 279                 //bcs->proto2 = -1;
 280                 // FIXME
 281                 break;
 282         case ISDN_CMD_REDIR:
 283                 dbg(DEBUG_ANY, "ISDN_CMD_REDIR"); //FIXME
 284                 break;
 285         case ISDN_CMD_PROT_IO:
 286                 dbg(DEBUG_ANY, "ISDN_CMD_PROT_IO");
 287                 break;
 288         case ISDN_CMD_FAXCMD:
 289                 dbg(DEBUG_ANY, "ISDN_CMD_FAXCMD");
 290                 break;
 291         case ISDN_CMD_GETL2:
 292                 dbg(DEBUG_ANY, "ISDN_CMD_GETL2");
 293                 break;
 294         case ISDN_CMD_GETL3:
 295                 dbg(DEBUG_ANY, "ISDN_CMD_GETL3");
 296                 break;
 297         case ISDN_CMD_GETEAZ:
 298                 dbg(DEBUG_ANY, "ISDN_CMD_GETEAZ");
 299                 break;
 300         case ISDN_CMD_SETSIL:
 301                 dbg(DEBUG_ANY, "ISDN_CMD_SETSIL");
 302                 break;
 303         case ISDN_CMD_GETSIL:
 304                 dbg(DEBUG_ANY, "ISDN_CMD_GETSIL");
 305                 break;
 306         default:
 307                 err("unknown command %d from LL",
 308                      cntrl->command);
 309                 return -EINVAL;
 310         }
 311
 312         return retval;
 313 }
 314
 315 void gigaset_i4l_cmd(struct cardstate *cs, int cmd)
 316 {
 317         isdn_ctrl command;
 318
 319         command.driver = cs->myid;
 320         command.command = cmd;
 321         command.arg = 0;
 322         cs->iif.statcallb(&command);
 323 }
 324
 325 void gigaset_i4l_channel_cmd(struct bc_state *bcs, int cmd)
 326 {
 327         isdn_ctrl command;
 328
 329         command.driver = bcs->cs->myid;
 330         command.command = cmd;
 331         command.arg = bcs->channel;
 332         bcs->cs->iif.statcallb(&command);
 333 }
 334
 335 int gigaset_isdn_setup_dial(struct at_state_t *at_state, void *data)
 336 {
 337         struct bc_state *bcs = at_state->bcs;
 338         unsigned proto;
 339         const char *bc;
 340         size_t length[AT_NUM];
 341         size_t l;
 342         int i;
 343         struct setup_parm *sp = data;
 344
 345         switch (bcs->proto2) {
 346         case ISDN_PROTO_L2_HDLC:
 347                 proto = 1; /* 0: Bitsynchron, 1: HDLC, 2: voice */
 348                 break;
 349         case ISDN_PROTO_L2_TRANS:
 350                 proto = 2; /* 0: Bitsynchron, 1: HDLC, 2: voice */
 351                 break;
 352         default:
 353                 err("invalid protocol: %u", bcs->proto2);
 354                 return -EINVAL;
 355         }
 356
 357         switch (sp->si1) {
 358         case 1:         /* audio */
 359                 bc = "9090A3";  /* 3.1 kHz audio, A-law */
 360                 break;
 361         case 7:         /* data */
 362         default:        /* hope the app knows what it is doing */
 363                 bc = "8890";    /* unrestricted digital information */
 364         }
 365         //FIXME add missing si1 values from 1TR6, inspect si2, set HLC/LLC
 366
 367         length[AT_DIAL ] = 1 + strlen(sp->phone) + 1 + 1;
 368         l = strlen(sp->eazmsn);
 369         length[AT_MSN  ] = l ? 6 + l + 1 + 1 : 0;
 370         length[AT_BC   ] = 5 + strlen(bc) + 1 + 1;
 371         length[AT_PROTO] = 6 + 1 + 1 + 1; /* proto: 1 character */
 372         length[AT_ISO  ] = 6 + 1 + 1 + 1; /* channel: 1 character */
 373         length[AT_TYPE ] = 6 + 1 + 1 + 1; /* call type: 1 character */
 374         length[AT_HLC  ] = 0;
 375
 376         for (i = 0; i < AT_NUM; ++i) {
 377                 kfree(bcs->commands[i]);
 378                 bcs->commands[i] = NULL;
 379                 if (length[i] &&
 380                     !(bcs->commands[i] = kmalloc(length[i], GFP_ATOMIC))) {
 381                         err("out of memory");
 382                         return -ENOMEM;
 383                 }
 384         }
 385
 386         /* type = 1: extern, 0: intern, 2: recall, 3: door, 4: centrex */
 387         if (sp->phone[0] == '*' && sp->phone[1] == '*') {
 388                 /* internal call: translate ** prefix to CTP value */
 389                 snprintf(bcs->commands[AT_DIAL], length[AT_DIAL],
 390                          "D%s\r", sp->phone+2);
 391                 strncpy(bcs->commands[AT_TYPE], "^SCTP=0\r", length[AT_TYPE]);
 392         } else {
 393                 snprintf(bcs->commands[AT_DIAL], length[AT_DIAL],
 394                          "D%s\r", sp->phone);
 395                 strncpy(bcs->commands[AT_TYPE], "^SCTP=1\r", length[AT_TYPE]);
 396         }
 397
 398         if (bcs->commands[AT_MSN])
 399                 snprintf(bcs->commands[AT_MSN], length[AT_MSN], "^SMSN=%s\r", sp->eazmsn);
 400         snprintf(bcs->commands[AT_BC   ], length[AT_BC   ], "^SBC=%s\r", bc);
 401         snprintf(bcs->commands[AT_PROTO], length[AT_PROTO], "^SBPR=%u\r", proto);
 402         snprintf(bcs->commands[AT_ISO  ], length[AT_ISO  ], "^SISO=%u\r", (unsigned)bcs->channel + 1);
 403
 404         return 0;
 405 }
 406
 407 int gigaset_isdn_setup_accept(struct at_state_t *at_state)
 408 {
 409         unsigned proto;
 410         size_t length[AT_NUM];
 411         int i;
 412         struct bc_state *bcs = at_state->bcs;
 413
 414         switch (bcs->proto2) {
 415         case ISDN_PROTO_L2_HDLC:
 416                 proto = 1; /* 0: Bitsynchron, 1: HDLC, 2: voice */
 417                 break;
 418         case ISDN_PROTO_L2_TRANS:
 419                 proto = 2; /* 0: Bitsynchron, 1: HDLC, 2: voice */
 420                 break;
 421         default:
 422                 err("invalid protocol: %u", bcs->proto2);
 423                 return -EINVAL;
 424         }
 425
 426         length[AT_DIAL ] = 0;
 427         length[AT_MSN  ] = 0;
 428         length[AT_BC   ] = 0;
 429         length[AT_PROTO] = 6 + 1 + 1 + 1; /* proto: 1 character */
 430         length[AT_ISO  ] = 6 + 1 + 1 + 1; /* channel: 1 character */
 431         length[AT_TYPE ] = 0;
 432         length[AT_HLC  ] = 0;
 433
 434         for (i = 0; i < AT_NUM; ++i) {
 435                 kfree(bcs->commands[i]);
 436                 bcs->commands[i] = NULL;
 437                 if (length[i] &&
 438                     !(bcs->commands[i] = kmalloc(length[i], GFP_ATOMIC))) {
 439                         err("out of memory");
 440                         return -ENOMEM;
 441                 }
 442         }
 443
 444         snprintf(bcs->commands[AT_PROTO], length[AT_PROTO], "^SBPR=%u\r", proto);
 445         snprintf(bcs->commands[AT_ISO  ], length[AT_ISO  ], "^SISO=%u\r", (unsigned) bcs->channel + 1);
 446
 447         return 0;
 448 }
 449
 450 int gigaset_isdn_icall(struct at_state_t *at_state)
 451 {
 452         struct cardstate *cs = at_state->cs;
 453         struct bc_state *bcs = at_state->bcs;
 454         isdn_ctrl response;
 455         int retval;
 456
 457         /* fill ICALL structure */
 458         response.parm.setup.si1 = 0;    /* default: unknown */
 459         response.parm.setup.si2 = 0;
 460         response.parm.setup.screen = 0; //FIXME how to set these?
 461         response.parm.setup.plan = 0;
 462         if (!at_state->str_var[STR_ZBC]) {
 463                 /* no BC (internal call): assume speech, A-law */
 464                 response.parm.setup.si1 = 1;
 465         } else if (!strcmp(at_state->str_var[STR_ZBC], "8890")) {
 466                 /* unrestricted digital information */
 467                 response.parm.setup.si1 = 7;
 468         } else if (!strcmp(at_state->str_var[STR_ZBC], "8090A3")) {
 469                 /* speech, A-law */
 470                 response.parm.setup.si1 = 1;
 471         } else if (!strcmp(at_state->str_var[STR_ZBC], "9090A3")) {
 472                 /* 3,1 kHz audio, A-law */
 473                 response.parm.setup.si1 = 1;
 474                 response.parm.setup.si2 = 2;
 475         } else {
 476                 warn("RING ignored - unsupported BC %s",
 477                      at_state->str_var[STR_ZBC]);
 478                 return ICALL_IGNORE;
 479         }
 480         if (at_state->str_var[STR_NMBR]) {
 481                 strncpy(response.parm.setup.phone, at_state->str_var[STR_NMBR],
 482                         sizeof response.parm.setup.phone - 1);
 483                 response.parm.setup.phone[sizeof response.parm.setup.phone - 1] = 0;
 484         } else
 485                 response.parm.setup.phone[0] = 0;
 486         if (at_state->str_var[STR_ZCPN]) {
 487                 strncpy(response.parm.setup.eazmsn, at_state->str_var[STR_ZCPN],
 488                         sizeof response.parm.setup.eazmsn - 1);
 489                 response.parm.setup.eazmsn[sizeof response.parm.setup.eazmsn - 1] = 0;
 490         } else
 491                 response.parm.setup.eazmsn[0] = 0;
 492
 493         if (!bcs) {
 494                 notice("no channel for incoming call");
 495                 dbg(DEBUG_CMD, "Sending ICALLW");
 496                 response.command = ISDN_STAT_ICALLW;
 497                 response.arg = 0; //FIXME
 498         } else {
 499                 dbg(DEBUG_CMD, "Sending ICALL");
 500                 response.command = ISDN_STAT_ICALL;
 501                 response.arg = bcs->channel; //FIXME
 502         }
 503         response.driver = cs->myid;
 504         retval = cs->iif.statcallb(&response);
 505         dbg(DEBUG_CMD, "Response: %d", retval);
 506         switch (retval) {
 507         case 0: /* no takers */
 508                 return ICALL_IGNORE;
 509         case 1: /* alerting */
 510                 bcs->chstate |= CHS_NOTIFY_LL;
 511                 return ICALL_ACCEPT;
 512         case 2: /* reject */
 513                 return ICALL_REJECT;
 514         case 3: /* incomplete */
 515                 warn("LL requested unsupported feature: Incomplete Number");
 516                 return ICALL_IGNORE;
 517         case 4: /* proceeding */
 518                 /* Gigaset will send ALERTING anyway.
 519                  * There doesn't seem to be a way to avoid this.
 520                  */
 521                 return ICALL_ACCEPT;
 522         case 5: /* deflect */
 523                 warn("LL requested unsupported feature: Call Deflection");
 524                 return ICALL_IGNORE;
 525         default:
 526                 err("LL error %d on ICALL", retval);
 527                 return ICALL_IGNORE;
 528         }
 529 }
 530
 531 /* Set Callback function pointer */
 532 int gigaset_register_to_LL(struct cardstate *cs, const char *isdnid)
 533 {
 534         isdn_if *iif = &cs->iif;
 535
 536         dbg(DEBUG_ANY, "Register driver capabilities to LL");
 537
 538         //iif->id[sizeof(iif->id) - 1]=0;
 539         //strncpy(iif->id, isdnid, sizeof(iif->id) - 1);
 540         if (snprintf(iif->id, sizeof iif->id, "%s_%u", isdnid, cs->minor_index)
 541             >= sizeof iif->id)
 542                 return -ENOMEM; //FIXME EINVAL/...??
 543
 544         iif->owner = THIS_MODULE;
 545         iif->channels = cs->channels;                        /* I am supporting just one channel *//* I was supporting...*/
 546         iif->maxbufsize = MAX_BUF_SIZE;
 547         iif->features = ISDN_FEATURE_L2_TRANS |   /* Our device is very advanced, therefore */
 548                 ISDN_FEATURE_L2_HDLC |
 549 #ifdef GIG_X75
 550                 ISDN_FEATURE_L2_X75I |
 551 #endif
 552                 ISDN_FEATURE_L3_TRANS |
 553                 ISDN_FEATURE_P_EURO;
 554         iif->hl_hdrlen = HW_HDR_LEN;              /* Area for storing ack */
 555         iif->command = command_from_LL;
 556         iif->writebuf_skb = writebuf_from_LL;
 557         iif->writecmd = NULL;                     /* Don't support isdnctrl */
 558         iif->readstat = NULL;                     /* Don't support isdnctrl */
 559         iif->rcvcallb_skb = NULL;                 /* Will be set by LL */
 560         iif->statcallb = NULL;                    /* Will be set by LL */
 561
 562         if (!register_isdn(iif))
 563                 return 0;
 564
 565         cs->myid = iif->channels;                 /* Set my device id */
 566         return 1;
 567 }