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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  */
  15
  16 #include "gigaset.h"
  17
  18 /* == Handling of I4L IO =====================================================*/
  19
  20 /* writebuf_from_LL
  21  * called by LL to transmit data on an open channel
  22  * inserts the buffer data into the send queue and starts the transmission
  23  * Note that this operation must not sleep!
  24  * When the buffer is processed completely, gigaset_skb_sent() should be called.
  25  * parameters:
  26  *      driverID        driver ID as assigned by LL
  27  *      channel         channel number
  28  *      ack             if != 0 LL wants to be notified on completion via
  29  *                      statcallb(ISDN_STAT_BSENT)
  30  *      skb             skb containing data to send
  31  * return value:
  32  *      number of accepted bytes
  33  *      0 if temporarily unable to accept data (out of buffer space)
  34  *      <0 on error (eg. -EINVAL)
  35  */
  36 static int writebuf_from_LL(int driverID, int channel, int ack,
  37                             struct sk_buff *skb)
  38 {
  39         struct cardstate *cs;
  40         struct bc_state *bcs;
  41         unsigned len;
  42         unsigned skblen;
  43
  44         if (!(cs = gigaset_get_cs_by_id(driverID))) {
  45                 err("%s: invalid driver ID (%d)", __func__, driverID);
  46                 return -ENODEV;
  47         }
  48         if (channel < 0 || channel >= cs->channels) {
  49                 err("%s: invalid channel ID (%d)", __func__, channel);
  50                 return -ENODEV;
  51         }
  52         bcs = &cs->bcs[channel];
  53         len = skb->len;
  54
  55         gig_dbg(DEBUG_LLDATA,
  56                 "Receiving data from LL (id: %d, ch: %d, ack: %d, sz: %d)",
  57                 driverID, channel, ack, len);
  58
  59         if (!atomic_read(&cs->connected)) {
  60                 err("%s: disconnected", __func__);
  61                 return -ENODEV;
  62         }
  63
  64         if (!len) {
  65                 if (ack)
  66                         notice("%s: not ACKing empty packet", __func__);
  67                 return 0;
  68         }
  69         if (len > MAX_BUF_SIZE) {
  70                 err("%s: packet too large (%d bytes)", __func__, len);
  71                 return -EINVAL;
  72         }
  73
  74         skblen = ack ? len : 0;
  75         skb->head[0] = skblen & 0xff;
  76         skb->head[1] = skblen >> 8;
  77         gig_dbg(DEBUG_MCMD, "skb: len=%u, skblen=%u: %02x %02x",
  78                 len, skblen, (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                 dev_warn(bcs->cs->dev, "%s: skb->len==%d\n",
  93                          __func__, skb->len);
  94
  95         len = (unsigned char) skb->head[0] |
  96               (unsigned) (unsigned char) skb->head[1] << 8;
  97         if (len) {
  98                 gig_dbg(DEBUG_MCMD, "ACKing to LL (id: %d, ch: %d, sz: %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         gigaset_debugdrivers();
 124
 125         //FIXME "remove test for &connected"
 126         if ((!cs || !atomic_read(&cs->connected))) {
 127                 warn("LL tried to access unknown device with nr. %d",
 128                      cntrl->driver);
 129                 return -ENODEV;
 130         }
 131
 132         switch (cntrl->command) {
 133         case ISDN_CMD_IOCTL:
 134                 gig_dbg(DEBUG_ANY, "ISDN_CMD_IOCTL (driver: %d, arg: %ld)",
 135                         cntrl->driver, cntrl->arg);
 136
 137                 warn("ISDN_CMD_IOCTL is not supported.");
 138                 return -EINVAL;
 139
 140         case ISDN_CMD_DIAL:
 141                 gig_dbg(DEBUG_ANY,
 142                         "ISDN_CMD_DIAL (driver: %d, ch: %ld, "
 143                         "phone: %s, ownmsn: %s, si1: %d, si2: %d)",
 144                         cntrl->driver, cntrl->arg,
 145                         cntrl->parm.setup.phone, cntrl->parm.setup.eazmsn,
 146                         cntrl->parm.setup.si1, cntrl->parm.setup.si2);
 147
 148                 if (cntrl->arg >= cs->channels) {
 149                         err("ISDN_CMD_DIAL: invalid channel (%d)",
 150                             (int) cntrl->arg);
 151                         return -EINVAL;
 152                 }
 153
 154                 bcs = cs->bcs + cntrl->arg;
 155
 156                 if (!gigaset_get_channel(bcs)) {
 157                         err("ISDN_CMD_DIAL: channel not free");
 158                         return -EBUSY;
 159                 }
 160
 161                 sp = kmalloc(sizeof *sp, GFP_ATOMIC);
 162                 if (!sp) {
 163                         gigaset_free_channel(bcs);
 164                         err("ISDN_CMD_DIAL: out of memory");
 165                         return -ENOMEM;
 166                 }
 167                 *sp = cntrl->parm.setup;
 168
 169                 if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, sp,
 170                                        atomic_read(&bcs->at_state.seq_index),
 171                                        NULL)) {
 172                         //FIXME what should we do?
 173                         kfree(sp);
 174                         gigaset_free_channel(bcs);
 175                         return -ENOMEM;
 176                 }
 177
 178                 gig_dbg(DEBUG_CMD, "scheduling DIAL");
 179                 gigaset_schedule_event(cs);
 180                 break;
 181         case ISDN_CMD_ACCEPTD: //FIXME
 182                 gig_dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTD");
 183
 184                 if (cntrl->arg >= cs->channels) {
 185                         err("ISDN_CMD_ACCEPTD: invalid channel (%d)",
 186                             (int) cntrl->arg);
 187                         return -EINVAL;
 188                 }
 189
 190                 if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg].at_state,
 191                                        EV_ACCEPT, NULL, 0, NULL)) {
 192                         //FIXME what should we do?
 193                         return -ENOMEM;
 194                 }
 195
 196                 gig_dbg(DEBUG_CMD, "scheduling ACCEPT");
 197                 gigaset_schedule_event(cs);
 198
 199                 break;
 200         case ISDN_CMD_ACCEPTB:
 201                 gig_dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTB");
 202                 break;
 203         case ISDN_CMD_HANGUP:
 204                 gig_dbg(DEBUG_ANY, "ISDN_CMD_HANGUP (ch: %d)",
 205                         (int) cntrl->arg);
 206
 207                 if (cntrl->arg >= cs->channels) {
 208                         err("ISDN_CMD_HANGUP: invalid channel (%u)",
 209                             (unsigned) cntrl->arg);
 210                         return -EINVAL;
 211                 }
 212
 213                 if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg].at_state,
 214                                        EV_HUP, NULL, 0, NULL)) {
 215                         //FIXME what should we do?
 216                         return -ENOMEM;
 217                 }
 218
 219                 gig_dbg(DEBUG_CMD, "scheduling HUP");
 220                 gigaset_schedule_event(cs);
 221
 222                 break;
 223         case ISDN_CMD_CLREAZ: /* Do not signal incoming signals */ //FIXME
 224                 gig_dbg(DEBUG_ANY, "ISDN_CMD_CLREAZ");
 225                 break;
 226         case ISDN_CMD_SETEAZ: /* Signal incoming calls for given MSN */ //FIXME
 227                 gig_dbg(DEBUG_ANY,
 228                         "ISDN_CMD_SETEAZ (id: %d, ch: %ld, number: %s)",
 229                         cntrl->driver, cntrl->arg, cntrl->parm.num);
 230                 break;
 231         case ISDN_CMD_SETL2: /* Set L2 to given protocol */
 232                 gig_dbg(DEBUG_ANY, "ISDN_CMD_SETL2 (ch: %ld, proto: %lx)",
 233                         cntrl->arg & 0xff, (cntrl->arg >> 8));
 234
 235                 if ((cntrl->arg & 0xff) >= cs->channels) {
 236                         err("ISDN_CMD_SETL2: invalid channel (%u)",
 237                             (unsigned) cntrl->arg & 0xff);
 238                         return -EINVAL;
 239                 }
 240
 241                 if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg & 0xff].at_state,
 242                                        EV_PROTO_L2, NULL, cntrl->arg >> 8,
 243                                        NULL)) {
 244                         //FIXME what should we do?
 245                         return -ENOMEM;
 246                 }
 247
 248                 gig_dbg(DEBUG_CMD, "scheduling PROTO_L2");
 249                 gigaset_schedule_event(cs);
 250                 break;
 251         case ISDN_CMD_SETL3: /* Set L3 to given protocol */
 252                 gig_dbg(DEBUG_ANY, "ISDN_CMD_SETL3 (ch: %ld, proto: %lx)",
 253                         cntrl->arg & 0xff, (cntrl->arg >> 8));
 254
 255                 if ((cntrl->arg & 0xff) >= cs->channels) {
 256                         err("ISDN_CMD_SETL3: invalid channel (%u)",
 257                             (unsigned) cntrl->arg & 0xff);
 258                         return -EINVAL;
 259                 }
 260
 261                 if (cntrl->arg >> 8 != ISDN_PROTO_L3_TRANS) {
 262                         err("ISDN_CMD_SETL3: invalid protocol %lu",
 263                             cntrl->arg >> 8);
 264                         return -EINVAL;
 265                 }
 266
 267                 break;
 268         case ISDN_CMD_PROCEED:
 269                 gig_dbg(DEBUG_ANY, "ISDN_CMD_PROCEED"); //FIXME
 270                 break;
 271         case ISDN_CMD_ALERT:
 272                 gig_dbg(DEBUG_ANY, "ISDN_CMD_ALERT"); //FIXME
 273                 if (cntrl->arg >= cs->channels) {
 274                         err("ISDN_CMD_ALERT: invalid channel (%d)",
 275                             (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                 gig_dbg(DEBUG_ANY, "ISDN_CMD_REDIR"); //FIXME
 284                 break;
 285         case ISDN_CMD_PROT_IO:
 286                 gig_dbg(DEBUG_ANY, "ISDN_CMD_PROT_IO");
 287                 break;
 288         case ISDN_CMD_FAXCMD:
 289                 gig_dbg(DEBUG_ANY, "ISDN_CMD_FAXCMD");
 290                 break;
 291         case ISDN_CMD_GETL2:
 292                 gig_dbg(DEBUG_ANY, "ISDN_CMD_GETL2");
 293                 break;
 294         case ISDN_CMD_GETL3:
 295                 gig_dbg(DEBUG_ANY, "ISDN_CMD_GETL3");
 296                 break;
 297         case ISDN_CMD_GETEAZ:
 298                 gig_dbg(DEBUG_ANY, "ISDN_CMD_GETEAZ");
 299                 break;
 300         case ISDN_CMD_SETSIL:
 301                 gig_dbg(DEBUG_ANY, "ISDN_CMD_SETSIL");
 302                 break;
 303         case ISDN_CMD_GETSIL:
 304                 gig_dbg(DEBUG_ANY, "ISDN_CMD_GETSIL");
 305                 break;
 306         default:
 307                 err("unknown command %d from LL", cntrl->command);
 308                 return -EINVAL;
 309         }
 310
 311         return retval;
 312 }
 313
 314 void gigaset_i4l_cmd(struct cardstate *cs, int cmd)
 315 {
 316         isdn_ctrl command;
 317
 318         command.driver = cs->myid;
 319         command.command = cmd;
 320         command.arg = 0;
 321         cs->iif.statcallb(&command);
 322 }
 323
 324 void gigaset_i4l_channel_cmd(struct bc_state *bcs, int cmd)
 325 {
 326         isdn_ctrl command;
 327
 328         command.driver = bcs->cs->myid;
 329         command.command = cmd;
 330         command.arg = bcs->channel;
 331         bcs->cs->iif.statcallb(&command);
 332 }
 333
 334 int gigaset_isdn_setup_dial(struct at_state_t *at_state, void *data)
 335 {
 336         struct bc_state *bcs = at_state->bcs;
 337         unsigned proto;
 338         const char *bc;
 339         size_t length[AT_NUM];
 340         size_t l;
 341         int i;
 342         struct setup_parm *sp = data;
 343
 344         switch (bcs->proto2) {
 345         case ISDN_PROTO_L2_HDLC:
 346                 proto = 1; /* 0: Bitsynchron, 1: HDLC, 2: voice */
 347                 break;
 348         case ISDN_PROTO_L2_TRANS:
 349                 proto = 2; /* 0: Bitsynchron, 1: HDLC, 2: voice */
 350                 break;
 351         default:
 352                 dev_err(bcs->cs->dev, "%s: invalid L2 protocol: %u\n",
 353                         __func__, 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                         dev_err(bcs->cs->dev, "out of memory\n");
 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],
 400                          "^SMSN=%s\r", sp->eazmsn);
 401         snprintf(bcs->commands[AT_BC   ], length[AT_BC   ],
 402                  "^SBC=%s\r", bc);
 403         snprintf(bcs->commands[AT_PROTO], length[AT_PROTO],
 404                  "^SBPR=%u\r", proto);
 405         snprintf(bcs->commands[AT_ISO  ], length[AT_ISO  ],
 406                  "^SISO=%u\r", (unsigned)bcs->channel + 1);
 407
 408         return 0;
 409 }
 410
 411 int gigaset_isdn_setup_accept(struct at_state_t *at_state)
 412 {
 413         unsigned proto;
 414         size_t length[AT_NUM];
 415         int i;
 416         struct bc_state *bcs = at_state->bcs;
 417
 418         switch (bcs->proto2) {
 419         case ISDN_PROTO_L2_HDLC:
 420                 proto = 1; /* 0: Bitsynchron, 1: HDLC, 2: voice */
 421                 break;
 422         case ISDN_PROTO_L2_TRANS:
 423                 proto = 2; /* 0: Bitsynchron, 1: HDLC, 2: voice */
 424                 break;
 425         default:
 426                 dev_err(at_state->cs->dev, "%s: invalid protocol: %u\n",
 427                         __func__, bcs->proto2);
 428                 return -EINVAL;
 429         }
 430
 431         length[AT_DIAL ] = 0;
 432         length[AT_MSN  ] = 0;
 433         length[AT_BC   ] = 0;
 434         length[AT_PROTO] = 6 + 1 + 1 + 1; /* proto: 1 character */
 435         length[AT_ISO  ] = 6 + 1 + 1 + 1; /* channel: 1 character */
 436         length[AT_TYPE ] = 0;
 437         length[AT_HLC  ] = 0;
 438
 439         for (i = 0; i < AT_NUM; ++i) {
 440                 kfree(bcs->commands[i]);
 441                 bcs->commands[i] = NULL;
 442                 if (length[i] &&
 443                     !(bcs->commands[i] = kmalloc(length[i], GFP_ATOMIC))) {
 444                         dev_err(at_state->cs->dev, "out of memory\n");
 445                         return -ENOMEM;
 446                 }
 447         }
 448
 449         snprintf(bcs->commands[AT_PROTO], length[AT_PROTO],
 450                  "^SBPR=%u\r", proto);
 451         snprintf(bcs->commands[AT_ISO  ], length[AT_ISO  ],
 452                  "^SISO=%u\r", (unsigned) bcs->channel + 1);
 453
 454         return 0;
 455 }
 456
 457 int gigaset_isdn_icall(struct at_state_t *at_state)
 458 {
 459         struct cardstate *cs = at_state->cs;
 460         struct bc_state *bcs = at_state->bcs;
 461         isdn_ctrl response;
 462         int retval;
 463
 464         /* fill ICALL structure */
 465         response.parm.setup.si1 = 0;    /* default: unknown */
 466         response.parm.setup.si2 = 0;
 467         response.parm.setup.screen = 0; //FIXME how to set these?
 468         response.parm.setup.plan = 0;
 469         if (!at_state->str_var[STR_ZBC]) {
 470                 /* no BC (internal call): assume speech, A-law */
 471                 response.parm.setup.si1 = 1;
 472         } else if (!strcmp(at_state->str_var[STR_ZBC], "8890")) {
 473                 /* unrestricted digital information */
 474                 response.parm.setup.si1 = 7;
 475         } else if (!strcmp(at_state->str_var[STR_ZBC], "8090A3")) {
 476                 /* speech, A-law */
 477                 response.parm.setup.si1 = 1;
 478         } else if (!strcmp(at_state->str_var[STR_ZBC], "9090A3")) {
 479                 /* 3,1 kHz audio, A-law */
 480                 response.parm.setup.si1 = 1;
 481                 response.parm.setup.si2 = 2;
 482         } else {
 483                 dev_warn(cs->dev, "RING ignored - unsupported BC %s\n",
 484                      at_state->str_var[STR_ZBC]);
 485                 return ICALL_IGNORE;
 486         }
 487         if (at_state->str_var[STR_NMBR]) {
 488                 strncpy(response.parm.setup.phone, at_state->str_var[STR_NMBR],
 489                         sizeof response.parm.setup.phone - 1);
 490                 response.parm.setup.phone[sizeof response.parm.setup.phone - 1] = 0;
 491         } else
 492                 response.parm.setup.phone[0] = 0;
 493         if (at_state->str_var[STR_ZCPN]) {
 494                 strncpy(response.parm.setup.eazmsn, at_state->str_var[STR_ZCPN],
 495                         sizeof response.parm.setup.eazmsn - 1);
 496                 response.parm.setup.eazmsn[sizeof response.parm.setup.eazmsn - 1] = 0;
 497         } else
 498                 response.parm.setup.eazmsn[0] = 0;
 499
 500         if (!bcs) {
 501                 dev_notice(cs->dev, "no channel for incoming call\n");
 502                 response.command = ISDN_STAT_ICALLW;
 503                 response.arg = 0; //FIXME
 504         } else {
 505                 gig_dbg(DEBUG_CMD, "Sending ICALL");
 506                 response.command = ISDN_STAT_ICALL;
 507                 response.arg = bcs->channel; //FIXME
 508         }
 509         response.driver = cs->myid;
 510         retval = cs->iif.statcallb(&response);
 511         gig_dbg(DEBUG_CMD, "Response: %d", retval);
 512         switch (retval) {
 513         case 0: /* no takers */
 514                 return ICALL_IGNORE;
 515         case 1: /* alerting */
 516                 bcs->chstate |= CHS_NOTIFY_LL;
 517                 return ICALL_ACCEPT;
 518         case 2: /* reject */
 519                 return ICALL_REJECT;
 520         case 3: /* incomplete */
 521                 dev_warn(cs->dev,
 522                        "LL requested unsupported feature: Incomplete Number\n");
 523                 return ICALL_IGNORE;
 524         case 4: /* proceeding */
 525                 /* Gigaset will send ALERTING anyway.
 526                  * There doesn't seem to be a way to avoid this.
 527                  */
 528                 return ICALL_ACCEPT;
 529         case 5: /* deflect */
 530                 dev_warn(cs->dev,
 531                          "LL requested unsupported feature: Call Deflection\n");
 532                 return ICALL_IGNORE;
 533         default:
 534                 dev_err(cs->dev, "LL error %d on ICALL\n", retval);
 535                 return ICALL_IGNORE;
 536         }
 537 }
 538
 539 /* Set Callback function pointer */
 540 int gigaset_register_to_LL(struct cardstate *cs, const char *isdnid)
 541 {
 542         isdn_if *iif = &cs->iif;
 543
 544         gig_dbg(DEBUG_ANY, "Register driver capabilities to LL");
 545
 546         //iif->id[sizeof(iif->id) - 1]=0;
 547         //strncpy(iif->id, isdnid, sizeof(iif->id) - 1);
 548         if (snprintf(iif->id, sizeof iif->id, "%s_%u", isdnid, cs->minor_index)
 549             >= sizeof iif->id)
 550                 return -ENOMEM; //FIXME EINVAL/...??
 551
 552         iif->owner = THIS_MODULE;
 553         iif->channels = cs->channels;
 554         iif->maxbufsize = MAX_BUF_SIZE;
 555         iif->features = ISDN_FEATURE_L2_TRANS |
 556                 ISDN_FEATURE_L2_HDLC |
 557 #ifdef GIG_X75
 558                 ISDN_FEATURE_L2_X75I |
 559 #endif
 560                 ISDN_FEATURE_L3_TRANS |
 561                 ISDN_FEATURE_P_EURO;
 562         iif->hl_hdrlen = HW_HDR_LEN;            /* Area for storing ack */
 563         iif->command = command_from_LL;
 564         iif->writebuf_skb = writebuf_from_LL;
 565         iif->writecmd = NULL;                   /* Don't support isdnctrl */
 566         iif->readstat = NULL;                   /* Don't support isdnctrl */
 567         iif->rcvcallb_skb = NULL;               /* Will be set by LL */
 568         iif->statcallb = NULL;                  /* Will be set by LL */
 569
 570         if (!register_isdn(iif))
 571                 return 0;
 572
 573         cs->myid = iif->channels;               /* Set my device id */
 574         return 1;
 575 }