drivers/isdn/gigaset/i4l.c

   1 /*
   2  * Stuff used by all variants of the driver
   3  *
   4  * Copyright (c) 2001 by Stefan Eilers,
   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                 dev_err(cs->dev, "%s: invalid channel ID (%d)\n",
  50                         __func__, channel);
  51                 return -ENODEV;
  52         }
  53         bcs = &cs->bcs[channel];
  54         len = skb->len;
  55
  56         gig_dbg(DEBUG_LLDATA,
  57                 "Receiving data from LL (id: %d, ch: %d, ack: %d, sz: %d)",
  58                 driverID, channel, ack, len);
  59
  60         if (!len) {
  61                 if (ack)
  62                         dev_notice(cs->dev, "%s: not ACKing empty packet\n",
  63                                    __func__);
  64                 return 0;
  65         }
  66         if (len > MAX_BUF_SIZE) {
  67                 dev_err(cs->dev, "%s: packet too large (%d bytes)\n",
  68                         __func__, len);
  69                 return -EINVAL;
  70         }
  71
  72         skblen = ack ? len : 0;
  73         skb->head[0] = skblen & 0xff;
  74         skb->head[1] = skblen >> 8;
  75         gig_dbg(DEBUG_MCMD, "skb: len=%u, skblen=%u: %02x %02x",
  76                 len, skblen, (unsigned) skb->head[0], (unsigned) skb->head[1]);
  77
  78         /* pass to device-specific module */
  79         return cs->ops->send_skb(bcs, skb);
  80 }
  81
  82 void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb)
  83 {
  84         unsigned len;
  85         isdn_ctrl response;
  86
  87         ++bcs->trans_up;
  88
  89         if (skb->len)
  90                 dev_warn(bcs->cs->dev, "%s: skb->len==%d\n",
  91                          __func__, skb->len);
  92
  93         len = (unsigned char) skb->head[0] |
  94               (unsigned) (unsigned char) skb->head[1] << 8;
  95         if (len) {
  96                 gig_dbg(DEBUG_MCMD, "ACKing to LL (id: %d, ch: %d, sz: %u)",
  97                         bcs->cs->myid, bcs->channel, len);
  98
  99                 response.driver = bcs->cs->myid;
 100                 response.command = ISDN_STAT_BSENT;
 101                 response.arg = bcs->channel;
 102                 response.parm.length = len;
 103                 bcs->cs->iif.statcallb(&response);
 104         }
 105 }
 106 EXPORT_SYMBOL_GPL(gigaset_skb_sent);
 107
 108 /* This function will be called by LL to send commands
 109  * NOTE: LL ignores the returned value, for commands other than ISDN_CMD_IOCTL,
 110  * so don't put too much effort into it.
 111  */
 112 static int command_from_LL(isdn_ctrl *cntrl)
 113 {
 114         struct cardstate *cs = gigaset_get_cs_by_id(cntrl->driver);
 115         struct bc_state *bcs;
 116         int retval = 0;
 117         struct setup_parm *sp;
 118
 119         gigaset_debugdrivers();
 120
 121         if (!cs) {
 122                 err("%s: invalid driver ID (%d)", __func__, cntrl->driver);
 123                 return -ENODEV;
 124         }
 125
 126         switch (cntrl->command) {
 127         case ISDN_CMD_IOCTL:
 128                 gig_dbg(DEBUG_ANY, "ISDN_CMD_IOCTL (driver: %d, arg: %ld)",
 129                         cntrl->driver, cntrl->arg);
 130
 131                 dev_warn(cs->dev, "ISDN_CMD_IOCTL not supported\n");
 132                 return -EINVAL;
 133
 134         case ISDN_CMD_DIAL:
 135                 gig_dbg(DEBUG_ANY,
 136                         "ISDN_CMD_DIAL (driver: %d, ch: %ld, "
 137                         "phone: %s, ownmsn: %s, si1: %d, si2: %d)",
 138                         cntrl->driver, cntrl->arg,
 139                         cntrl->parm.setup.phone, cntrl->parm.setup.eazmsn,
 140                         cntrl->parm.setup.si1, cntrl->parm.setup.si2);
 141
 142                 if (cntrl->arg >= cs->channels) {
 143                         dev_err(cs->dev,
 144                                 "ISDN_CMD_DIAL: invalid channel (%d)\n",
 145                                 (int) cntrl->arg);
 146                         return -EINVAL;
 147                 }
 148
 149                 bcs = cs->bcs + cntrl->arg;
 150
 151                 if (!gigaset_get_channel(bcs)) {
 152                         dev_err(cs->dev, "ISDN_CMD_DIAL: channel not free\n");
 153                         return -EBUSY;
 154                 }
 155
 156                 sp = kmalloc(sizeof *sp, GFP_ATOMIC);
 157                 if (!sp) {
 158                         gigaset_free_channel(bcs);
 159                         dev_err(cs->dev, "ISDN_CMD_DIAL: out of memory\n");
 160                         return -ENOMEM;
 161                 }
 162                 *sp = cntrl->parm.setup;
 163
 164                 if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, sp,
 165                                        bcs->at_state.seq_index, NULL)) {
 166                         //FIXME what should we do?
 167                         kfree(sp);
 168                         gigaset_free_channel(bcs);
 169                         return -ENOMEM;
 170                 }
 171
 172                 gig_dbg(DEBUG_CMD, "scheduling DIAL");
 173                 gigaset_schedule_event(cs);
 174                 break;
 175         case ISDN_CMD_ACCEPTD: //FIXME
 176                 gig_dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTD");
 177
 178                 if (cntrl->arg >= cs->channels) {
 179                         dev_err(cs->dev,
 180                                 "ISDN_CMD_ACCEPTD: invalid channel (%d)\n",
 181                                 (int) cntrl->arg);
 182                         return -EINVAL;
 183                 }
 184
 185                 if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg].at_state,
 186                                        EV_ACCEPT, NULL, 0, NULL)) {
 187                         //FIXME what should we do?
 188                         return -ENOMEM;
 189                 }
 190
 191                 gig_dbg(DEBUG_CMD, "scheduling ACCEPT");
 192                 gigaset_schedule_event(cs);
 193
 194                 break;
 195         case ISDN_CMD_ACCEPTB:
 196                 gig_dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTB");
 197                 break;
 198         case ISDN_CMD_HANGUP:
 199                 gig_dbg(DEBUG_ANY, "ISDN_CMD_HANGUP (ch: %d)",
 200                         (int) cntrl->arg);
 201
 202                 if (cntrl->arg >= cs->channels) {
 203                         dev_err(cs->dev,
 204                                 "ISDN_CMD_HANGUP: invalid channel (%d)\n",
 205                                 (int) cntrl->arg);
 206                         return -EINVAL;
 207                 }
 208
 209                 if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg].at_state,
 210                                        EV_HUP, NULL, 0, NULL)) {
 211                         //FIXME what should we do?
 212                         return -ENOMEM;
 213                 }
 214
 215                 gig_dbg(DEBUG_CMD, "scheduling HUP");
 216                 gigaset_schedule_event(cs);
 217
 218                 break;
 219         case ISDN_CMD_CLREAZ: /* Do not signal incoming signals */ //FIXME
 220                 gig_dbg(DEBUG_ANY, "ISDN_CMD_CLREAZ");
 221                 break;
 222         case ISDN_CMD_SETEAZ: /* Signal incoming calls for given MSN */ //FIXME
 223                 gig_dbg(DEBUG_ANY,
 224                         "ISDN_CMD_SETEAZ (id: %d, ch: %ld, number: %s)",
 225                         cntrl->driver, cntrl->arg, cntrl->parm.num);
 226                 break;
 227         case ISDN_CMD_SETL2: /* Set L2 to given protocol */
 228                 gig_dbg(DEBUG_ANY, "ISDN_CMD_SETL2 (ch: %ld, proto: %lx)",
 229                         cntrl->arg & 0xff, (cntrl->arg >> 8));
 230
 231                 if ((cntrl->arg & 0xff) >= cs->channels) {
 232                         dev_err(cs->dev,
 233                                 "ISDN_CMD_SETL2: invalid channel (%d)\n",
 234                                 (int) cntrl->arg & 0xff);
 235                         return -EINVAL;
 236                 }
 237
 238                 if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg & 0xff].at_state,
 239                                        EV_PROTO_L2, NULL, cntrl->arg >> 8,
 240                                        NULL)) {
 241                         //FIXME what should we do?
 242                         return -ENOMEM;
 243                 }
 244
 245                 gig_dbg(DEBUG_CMD, "scheduling PROTO_L2");
 246                 gigaset_schedule_event(cs);
 247                 break;
 248         case ISDN_CMD_SETL3: /* Set L3 to given protocol */
 249                 gig_dbg(DEBUG_ANY, "ISDN_CMD_SETL3 (ch: %ld, proto: %lx)",
 250                         cntrl->arg & 0xff, (cntrl->arg >> 8));
 251
 252                 if ((cntrl->arg & 0xff) >= cs->channels) {
 253                         dev_err(cs->dev,
 254                                 "ISDN_CMD_SETL3: invalid channel (%d)\n",
 255                                 (int) cntrl->arg & 0xff);
 256                         return -EINVAL;
 257                 }
 258
 259                 if (cntrl->arg >> 8 != ISDN_PROTO_L3_TRANS) {
 260                         dev_err(cs->dev,
 261                                 "ISDN_CMD_SETL3: invalid protocol %lu\n",
 262                                 cntrl->arg >> 8);
 263                         return -EINVAL;
 264                 }
 265
 266                 break;
 267         case ISDN_CMD_PROCEED:
 268                 gig_dbg(DEBUG_ANY, "ISDN_CMD_PROCEED"); //FIXME
 269                 break;
 270         case ISDN_CMD_ALERT:
 271                 gig_dbg(DEBUG_ANY, "ISDN_CMD_ALERT"); //FIXME
 272                 if (cntrl->arg >= cs->channels) {
 273                         dev_err(cs->dev,
 274                                 "ISDN_CMD_ALERT: invalid channel (%d)\n",
 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                 dev_err(cs->dev, "unknown command %d from LL\n",
 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                 dev_err(bcs->cs->dev, "%s: invalid L2 protocol: %u\n",
 354                         __func__, bcs->proto2);
 355                 return -EINVAL;
 356         }
 357
 358         switch (sp->si1) {
 359         case 1:         /* audio */
 360                 bc = "9090A3";  /* 3.1 kHz audio, A-law */
 361                 break;
 362         case 7:         /* data */
 363         default:        /* hope the app knows what it is doing */
 364                 bc = "8890";    /* unrestricted digital information */
 365         }
 366         //FIXME add missing si1 values from 1TR6, inspect si2, set HLC/LLC
 367
 368         length[AT_DIAL ] = 1 + strlen(sp->phone) + 1 + 1;
 369         l = strlen(sp->eazmsn);
 370         length[AT_MSN  ] = l ? 6 + l + 1 + 1 : 0;
 371         length[AT_BC   ] = 5 + strlen(bc) + 1 + 1;
 372         length[AT_PROTO] = 6 + 1 + 1 + 1; /* proto: 1 character */
 373         length[AT_ISO  ] = 6 + 1 + 1 + 1; /* channel: 1 character */
 374         length[AT_TYPE ] = 6 + 1 + 1 + 1; /* call type: 1 character */
 375         length[AT_HLC  ] = 0;
 376
 377         for (i = 0; i < AT_NUM; ++i) {
 378                 kfree(bcs->commands[i]);
 379                 bcs->commands[i] = NULL;
 380                 if (length[i] &&
 381                     !(bcs->commands[i] = kmalloc(length[i], GFP_ATOMIC))) {
 382                         dev_err(bcs->cs->dev, "out of memory\n");
 383                         return -ENOMEM;
 384                 }
 385         }
 386
 387         /* type = 1: extern, 0: intern, 2: recall, 3: door, 4: centrex */
 388         if (sp->phone[0] == '*' && sp->phone[1] == '*') {
 389                 /* internal call: translate ** prefix to CTP value */
 390                 snprintf(bcs->commands[AT_DIAL], length[AT_DIAL],
 391                          "D%s\r", sp->phone+2);
 392                 strncpy(bcs->commands[AT_TYPE], "^SCTP=0\r", length[AT_TYPE]);
 393         } else {
 394                 snprintf(bcs->commands[AT_DIAL], length[AT_DIAL],
 395                          "D%s\r", sp->phone);
 396                 strncpy(bcs->commands[AT_TYPE], "^SCTP=1\r", length[AT_TYPE]);
 397         }
 398
 399         if (bcs->commands[AT_MSN])
 400                 snprintf(bcs->commands[AT_MSN], length[AT_MSN],
 401                          "^SMSN=%s\r", sp->eazmsn);
 402         snprintf(bcs->commands[AT_BC   ], length[AT_BC   ],
 403                  "^SBC=%s\r", bc);
 404         snprintf(bcs->commands[AT_PROTO], length[AT_PROTO],
 405                  "^SBPR=%u\r", proto);
 406         snprintf(bcs->commands[AT_ISO  ], length[AT_ISO  ],
 407                  "^SISO=%u\r", (unsigned)bcs->channel + 1);
 408
 409         return 0;
 410 }
 411
 412 int gigaset_isdn_setup_accept(struct at_state_t *at_state)
 413 {
 414         unsigned proto;
 415         size_t length[AT_NUM];
 416         int i;
 417         struct bc_state *bcs = at_state->bcs;
 418
 419         switch (bcs->proto2) {
 420         case ISDN_PROTO_L2_HDLC:
 421                 proto = 1; /* 0: Bitsynchron, 1: HDLC, 2: voice */
 422                 break;
 423         case ISDN_PROTO_L2_TRANS:
 424                 proto = 2; /* 0: Bitsynchron, 1: HDLC, 2: voice */
 425                 break;
 426         default:
 427                 dev_err(at_state->cs->dev, "%s: invalid protocol: %u\n",
 428                         __func__, bcs->proto2);
 429                 return -EINVAL;
 430         }
 431
 432         length[AT_DIAL ] = 0;
 433         length[AT_MSN  ] = 0;
 434         length[AT_BC   ] = 0;
 435         length[AT_PROTO] = 6 + 1 + 1 + 1; /* proto: 1 character */
 436         length[AT_ISO  ] = 6 + 1 + 1 + 1; /* channel: 1 character */
 437         length[AT_TYPE ] = 0;
 438         length[AT_HLC  ] = 0;
 439
 440         for (i = 0; i < AT_NUM; ++i) {
 441                 kfree(bcs->commands[i]);
 442                 bcs->commands[i] = NULL;
 443                 if (length[i] &&
 444                     !(bcs->commands[i] = kmalloc(length[i], GFP_ATOMIC))) {
 445                         dev_err(at_state->cs->dev, "out of memory\n");
 446                         return -ENOMEM;
 447                 }
 448         }
 449
 450         snprintf(bcs->commands[AT_PROTO], length[AT_PROTO],
 451                  "^SBPR=%u\r", proto);
 452         snprintf(bcs->commands[AT_ISO  ], length[AT_ISO  ],
 453                  "^SISO=%u\r", (unsigned) bcs->channel + 1);
 454
 455         return 0;
 456 }
 457
 458 int gigaset_isdn_icall(struct at_state_t *at_state)
 459 {
 460         struct cardstate *cs = at_state->cs;
 461         struct bc_state *bcs = at_state->bcs;
 462         isdn_ctrl response;
 463         int retval;
 464
 465         /* fill ICALL structure */
 466         response.parm.setup.si1 = 0;    /* default: unknown */
 467         response.parm.setup.si2 = 0;
 468         response.parm.setup.screen = 0; //FIXME how to set these?
 469         response.parm.setup.plan = 0;
 470         if (!at_state->str_var[STR_ZBC]) {
 471                 /* no BC (internal call): assume speech, A-law */
 472                 response.parm.setup.si1 = 1;
 473         } else if (!strcmp(at_state->str_var[STR_ZBC], "8890")) {
 474                 /* unrestricted digital information */
 475                 response.parm.setup.si1 = 7;
 476         } else if (!strcmp(at_state->str_var[STR_ZBC], "8090A3")) {
 477                 /* speech, A-law */
 478                 response.parm.setup.si1 = 1;
 479         } else if (!strcmp(at_state->str_var[STR_ZBC], "9090A3")) {
 480                 /* 3,1 kHz audio, A-law */
 481                 response.parm.setup.si1 = 1;
 482                 response.parm.setup.si2 = 2;
 483         } else {
 484                 dev_warn(cs->dev, "RING ignored - unsupported BC %s\n",
 485                      at_state->str_var[STR_ZBC]);
 486                 return ICALL_IGNORE;
 487         }
 488         if (at_state->str_var[STR_NMBR]) {
 489                 strncpy(response.parm.setup.phone, at_state->str_var[STR_NMBR],
 490                         sizeof response.parm.setup.phone - 1);
 491                 response.parm.setup.phone[sizeof response.parm.setup.phone - 1] = 0;
 492         } else
 493                 response.parm.setup.phone[0] = 0;
 494         if (at_state->str_var[STR_ZCPN]) {
 495                 strncpy(response.parm.setup.eazmsn, at_state->str_var[STR_ZCPN],
 496                         sizeof response.parm.setup.eazmsn - 1);
 497                 response.parm.setup.eazmsn[sizeof response.parm.setup.eazmsn - 1] = 0;
 498         } else
 499                 response.parm.setup.eazmsn[0] = 0;
 500
 501         if (!bcs) {
 502                 dev_notice(cs->dev, "no channel for incoming call\n");
 503                 response.command = ISDN_STAT_ICALLW;
 504                 response.arg = 0; //FIXME
 505         } else {
 506                 gig_dbg(DEBUG_CMD, "Sending ICALL");
 507                 response.command = ISDN_STAT_ICALL;
 508                 response.arg = bcs->channel; //FIXME
 509         }
 510         response.driver = cs->myid;
 511         retval = cs->iif.statcallb(&response);
 512         gig_dbg(DEBUG_CMD, "Response: %d", retval);
 513         switch (retval) {
 514         case 0: /* no takers */
 515                 return ICALL_IGNORE;
 516         case 1: /* alerting */
 517                 bcs->chstate |= CHS_NOTIFY_LL;
 518                 return ICALL_ACCEPT;
 519         case 2: /* reject */
 520                 return ICALL_REJECT;
 521         case 3: /* incomplete */
 522                 dev_warn(cs->dev,
 523                        "LL requested unsupported feature: Incomplete Number\n");
 524                 return ICALL_IGNORE;
 525         case 4: /* proceeding */
 526                 /* Gigaset will send ALERTING anyway.
 527                  * There doesn't seem to be a way to avoid this.
 528                  */
 529                 return ICALL_ACCEPT;
 530         case 5: /* deflect */
 531                 dev_warn(cs->dev,
 532                          "LL requested unsupported feature: Call Deflection\n");
 533                 return ICALL_IGNORE;
 534         default:
 535                 dev_err(cs->dev, "LL error %d on ICALL\n", retval);
 536                 return ICALL_IGNORE;
 537         }
 538 }
 539
 540 /* Set Callback function pointer */
 541 int gigaset_register_to_LL(struct cardstate *cs, const char *isdnid)
 542 {
 543         isdn_if *iif = &cs->iif;
 544
 545         gig_dbg(DEBUG_ANY, "Register driver capabilities to LL");
 546
 547         //iif->id[sizeof(iif->id) - 1]=0;
 548         //strncpy(iif->id, isdnid, sizeof(iif->id) - 1);
 549         if (snprintf(iif->id, sizeof iif->id, "%s_%u", isdnid, cs->minor_index)
 550             >= sizeof iif->id)
 551                 return -ENOMEM; //FIXME EINVAL/...??
 552
 553         iif->owner = THIS_MODULE;
 554         iif->channels = cs->channels;
 555         iif->maxbufsize = MAX_BUF_SIZE;
 556         iif->features = ISDN_FEATURE_L2_TRANS |
 557                 ISDN_FEATURE_L2_HDLC |
 558 #ifdef GIG_X75
 559                 ISDN_FEATURE_L2_X75I |
 560 #endif
 561                 ISDN_FEATURE_L3_TRANS |
 562                 ISDN_FEATURE_P_EURO;
 563         iif->hl_hdrlen = HW_HDR_LEN;            /* Area for storing ack */
 564         iif->command = command_from_LL;
 565         iif->writebuf_skb = writebuf_from_LL;
 566         iif->writecmd = NULL;                   /* Don't support isdnctrl */
 567         iif->readstat = NULL;                   /* Don't support isdnctrl */
 568         iif->rcvcallb_skb = NULL;               /* Will be set by LL */
 569         iif->statcallb = NULL;                  /* Will be set by LL */
 570
 571         if (!register_isdn(iif))
 572                 return 0;
 573
 574         cs->myid = iif->channels;               /* Set my device id */
 575         return 1;
 576 }