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 #include <linux/isdnif.h>
  18 #include <linux/slab.h>
  19
  20 #define HW_HDR_LEN      2       /* Header size used to store ack info */
  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
  33  *                      statcallb(ISDN_STAT_BSENT)
  34  *      skb             skb containing data to send
  35  * return value:
  36  *      number of accepted bytes
  37  *      0 if temporarily unable to accept data (out of buffer space)
  38  *      <0 on error (eg. -EINVAL)
  39  */
  40 static int writebuf_from_LL(int driverID, int channel, int ack,
  41                             struct sk_buff *skb)
  42 {
  43         struct cardstate *cs = gigaset_get_cs_by_id(driverID);
  44         struct bc_state *bcs;
  45         unsigned char *ack_header;
  46         unsigned len;
  47
  48         if (!cs) {
  49                 pr_err("%s: invalid driver ID (%d)\n", __func__, driverID);
  50                 return -ENODEV;
  51         }
  52         if (channel < 0 || channel >= cs->channels) {
  53                 dev_err(cs->dev, "%s: invalid channel ID (%d)\n",
  54                         __func__, channel);
  55                 return -ENODEV;
  56         }
  57         bcs = &cs->bcs[channel];
  58
  59         /* can only handle linear sk_buffs */
  60         if (skb_linearize(skb) < 0) {
  61                 dev_err(cs->dev, "%s: skb_linearize failed\n", __func__);
  62                 return -ENOMEM;
  63         }
  64         len = skb->len;
  65
  66         gig_dbg(DEBUG_LLDATA,
  67                 "Receiving data from LL (id: %d, ch: %d, ack: %d, sz: %d)",
  68                 driverID, channel, ack, len);
  69
  70         if (!len) {
  71                 if (ack)
  72                         dev_notice(cs->dev, "%s: not ACKing empty packet\n",
  73                                    __func__);
  74                 return 0;
  75         }
  76         if (len > MAX_BUF_SIZE) {
  77                 dev_err(cs->dev, "%s: packet too large (%d bytes)\n",
  78                         __func__, len);
  79                 return -EINVAL;
  80         }
  81
  82         /* set up acknowledgement header */
  83         if (skb_headroom(skb) < HW_HDR_LEN) {
  84                 /* should never happen */
  85                 dev_err(cs->dev, "%s: insufficient skb headroom\n", __func__);
  86                 return -ENOMEM;
  87         }
  88         skb_set_mac_header(skb, -HW_HDR_LEN);
  89         skb->mac_len = HW_HDR_LEN;
  90         ack_header = skb_mac_header(skb);
  91         if (ack) {
  92                 ack_header[0] = len & 0xff;
  93                 ack_header[1] = len >> 8;
  94         } else {
  95                 ack_header[0] = ack_header[1] = 0;
  96         }
  97         gig_dbg(DEBUG_MCMD, "skb: len=%u, ack=%d: %02x %02x",
  98                 len, ack, ack_header[0], ack_header[1]);
  99
 100         /* pass to device-specific module */
 101         return cs->ops->send_skb(bcs, skb);
 102 }
 103
 104 /**
 105  * gigaset_skb_sent() - acknowledge sending an skb
 106  * @bcs:        B channel descriptor structure.
 107  * @skb:        sent data.
 108  *
 109  * Called by hardware module {bas,ser,usb}_gigaset when the data in a
 110  * skb has been successfully sent, for signalling completion to the LL.
 111  */
 112 void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb)
 113 {
 114         isdn_if *iif = bcs->cs->iif;
 115         unsigned char *ack_header = skb_mac_header(skb);
 116         unsigned len;
 117         isdn_ctrl response;
 118
 119         ++bcs->trans_up;
 120
 121         if (skb->len)
 122                 dev_warn(bcs->cs->dev, "%s: skb->len==%d\n",
 123                          __func__, skb->len);
 124
 125         len = ack_header[0] + ((unsigned) ack_header[1] << 8);
 126         if (len) {
 127                 gig_dbg(DEBUG_MCMD, "ACKing to LL (id: %d, ch: %d, sz: %u)",
 128                         bcs->cs->myid, bcs->channel, len);
 129
 130                 response.driver = bcs->cs->myid;
 131                 response.command = ISDN_STAT_BSENT;
 132                 response.arg = bcs->channel;
 133                 response.parm.length = len;
 134                 iif->statcallb(&response);
 135         }
 136 }
 137 EXPORT_SYMBOL_GPL(gigaset_skb_sent);
 138
 139 /**
 140  * gigaset_skb_rcvd() - pass received skb to LL
 141  * @bcs:        B channel descriptor structure.
 142  * @skb:        received data.
 143  *
 144  * Called by hardware module {bas,ser,usb}_gigaset when user data has
 145  * been successfully received, for passing to the LL.
 146  * Warning: skb must not be accessed anymore!
 147  */
 148 void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb)
 149 {
 150         isdn_if *iif = bcs->cs->iif;
 151
 152         iif->rcvcallb_skb(bcs->cs->myid, bcs->channel, skb);
 153         bcs->trans_down++;
 154 }
 155 EXPORT_SYMBOL_GPL(gigaset_skb_rcvd);
 156
 157 /**
 158  * gigaset_isdn_rcv_err() - signal receive error
 159  * @bcs:        B channel descriptor structure.
 160  *
 161  * Called by hardware module {bas,ser,usb}_gigaset when a receive error
 162  * has occurred, for signalling to the LL.
 163  */
 164 void gigaset_isdn_rcv_err(struct bc_state *bcs)
 165 {
 166         isdn_if *iif = bcs->cs->iif;
 167         isdn_ctrl response;
 168
 169         /* if currently ignoring packets, just count down */
 170         if (bcs->ignore) {
 171                 bcs->ignore--;
 172                 return;
 173         }
 174
 175         /* update statistics */
 176         bcs->corrupted++;
 177
 178         /* error -> LL */
 179         gig_dbg(DEBUG_CMD, "sending L1ERR");
 180         response.driver = bcs->cs->myid;
 181         response.command = ISDN_STAT_L1ERR;
 182         response.arg = bcs->channel;
 183         response.parm.errcode = ISDN_STAT_L1ERR_RECV;
 184         iif->statcallb(&response);
 185 }
 186 EXPORT_SYMBOL_GPL(gigaset_isdn_rcv_err);
 187
 188 /* This function will be called by LL to send commands
 189  * NOTE: LL ignores the returned value, for commands other than ISDN_CMD_IOCTL,
 190  * so don't put too much effort into it.
 191  */
 192 static int command_from_LL(isdn_ctrl *cntrl)
 193 {
 194         struct cardstate *cs;
 195         struct bc_state *bcs;
 196         int retval = 0;
 197         char **commands;
 198         int ch;
 199         int i;
 200         size_t l;
 201
 202         gigaset_debugdrivers();
 203
 204         gig_dbg(DEBUG_CMD, "driver: %d, command: %d, arg: 0x%lx",
 205                 cntrl->driver, cntrl->command, cntrl->arg);
 206
 207         cs = gigaset_get_cs_by_id(cntrl->driver);
 208         if (cs == NULL) {
 209                 pr_err("%s: invalid driver ID (%d)\n", __func__, cntrl->driver);
 210                 return -ENODEV;
 211         }
 212         ch = cntrl->arg & 0xff;
 213
 214         switch (cntrl->command) {
 215         case ISDN_CMD_IOCTL:
 216                 dev_warn(cs->dev, "ISDN_CMD_IOCTL not supported\n");
 217                 return -EINVAL;
 218
 219         case ISDN_CMD_DIAL:
 220                 gig_dbg(DEBUG_CMD,
 221                         "ISDN_CMD_DIAL (phone: %s, msn: %s, si1: %d, si2: %d)",
 222                         cntrl->parm.setup.phone, cntrl->parm.setup.eazmsn,
 223                         cntrl->parm.setup.si1, cntrl->parm.setup.si2);
 224
 225                 if (ch >= cs->channels) {
 226                         dev_err(cs->dev,
 227                                 "ISDN_CMD_DIAL: invalid channel (%d)\n", ch);
 228                         return -EINVAL;
 229                 }
 230                 bcs = cs->bcs + ch;
 231                 if (!gigaset_get_channel(bcs)) {
 232                         dev_err(cs->dev, "ISDN_CMD_DIAL: channel not free\n");
 233                         return -EBUSY;
 234                 }
 235
 236                 commands = kzalloc(AT_NUM*(sizeof *commands), GFP_ATOMIC);
 237                 if (!commands) {
 238                         gigaset_free_channel(bcs);
 239                         dev_err(cs->dev, "ISDN_CMD_DIAL: out of memory\n");
 240                         return -ENOMEM;
 241                 }
 242
 243                 l = 3 + strlen(cntrl->parm.setup.phone);
 244                 commands[AT_DIAL] = kmalloc(l, GFP_ATOMIC);
 245                 if (!commands[AT_DIAL])
 246                         goto oom;
 247                 if (cntrl->parm.setup.phone[0] == '*' &&
 248                     cntrl->parm.setup.phone[1] == '*') {
 249                         /* internal call: translate ** prefix to CTP value */
 250                         commands[AT_TYPE] = kstrdup("^SCTP=0\r", GFP_ATOMIC);
 251                         if (!commands[AT_TYPE])
 252                                 goto oom;
 253                         snprintf(commands[AT_DIAL], l,
 254                                  "D%s\r", cntrl->parm.setup.phone+2);
 255                 } else {
 256                         commands[AT_TYPE] = kstrdup("^SCTP=1\r", GFP_ATOMIC);
 257                         if (!commands[AT_TYPE])
 258                                 goto oom;
 259                         snprintf(commands[AT_DIAL], l,
 260                                  "D%s\r", cntrl->parm.setup.phone);
 261                 }
 262
 263                 l = strlen(cntrl->parm.setup.eazmsn);
 264                 if (l) {
 265                         l += 8;
 266                         commands[AT_MSN] = kmalloc(l, GFP_ATOMIC);
 267                         if (!commands[AT_MSN])
 268                                 goto oom;
 269                         snprintf(commands[AT_MSN], l, "^SMSN=%s\r",
 270                                  cntrl->parm.setup.eazmsn);
 271                 }
 272
 273                 switch (cntrl->parm.setup.si1) {
 274                 case 1:         /* audio */
 275                         /* BC = 9090A3: 3.1 kHz audio, A-law */
 276                         commands[AT_BC] = kstrdup("^SBC=9090A3\r", GFP_ATOMIC);
 277                         if (!commands[AT_BC])
 278                                 goto oom;
 279                         break;
 280                 case 7:         /* data */
 281                 default:        /* hope the app knows what it is doing */
 282                         /* BC = 8890: unrestricted digital information */
 283                         commands[AT_BC] = kstrdup("^SBC=8890\r", GFP_ATOMIC);
 284                         if (!commands[AT_BC])
 285                                 goto oom;
 286                 }
 287                 /* ToDo: other si1 values, inspect si2, set HLC/LLC */
 288
 289                 commands[AT_PROTO] = kmalloc(9, GFP_ATOMIC);
 290                 if (!commands[AT_PROTO])
 291                         goto oom;
 292                 snprintf(commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
 293
 294                 commands[AT_ISO] = kmalloc(9, GFP_ATOMIC);
 295                 if (!commands[AT_ISO])
 296                         goto oom;
 297                 snprintf(commands[AT_ISO], 9, "^SISO=%u\r",
 298                          (unsigned) bcs->channel + 1);
 299
 300                 if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, commands,
 301                                        bcs->at_state.seq_index, NULL)) {
 302                         for (i = 0; i < AT_NUM; ++i)
 303                                 kfree(commands[i]);
 304                         kfree(commands);
 305                         gigaset_free_channel(bcs);
 306                         return -ENOMEM;
 307                 }
 308                 gigaset_schedule_event(cs);
 309                 break;
 310         case ISDN_CMD_ACCEPTD:
 311                 gig_dbg(DEBUG_CMD, "ISDN_CMD_ACCEPTD");
 312                 if (ch >= cs->channels) {
 313                         dev_err(cs->dev,
 314                                 "ISDN_CMD_ACCEPTD: invalid channel (%d)\n", ch);
 315                         return -EINVAL;
 316                 }
 317                 bcs = cs->bcs + ch;
 318                 if (!gigaset_add_event(cs, &bcs->at_state,
 319                                        EV_ACCEPT, NULL, 0, NULL))
 320                         return -ENOMEM;
 321                 gigaset_schedule_event(cs);
 322
 323                 break;
 324         case ISDN_CMD_HANGUP:
 325                 gig_dbg(DEBUG_CMD, "ISDN_CMD_HANGUP");
 326                 if (ch >= cs->channels) {
 327                         dev_err(cs->dev,
 328                                 "ISDN_CMD_HANGUP: invalid channel (%d)\n", ch);
 329                         return -EINVAL;
 330                 }
 331                 bcs = cs->bcs + ch;
 332                 if (!gigaset_add_event(cs, &bcs->at_state,
 333                                        EV_HUP, NULL, 0, NULL))
 334                         return -ENOMEM;
 335                 gigaset_schedule_event(cs);
 336
 337                 break;
 338         case ISDN_CMD_CLREAZ: /* Do not signal incoming signals */
 339                 dev_info(cs->dev, "ignoring ISDN_CMD_CLREAZ\n");
 340                 break;
 341         case ISDN_CMD_SETEAZ: /* Signal incoming calls for given MSN */
 342                 dev_info(cs->dev, "ignoring ISDN_CMD_SETEAZ (%s)\n",
 343                          cntrl->parm.num);
 344                 break;
 345         case ISDN_CMD_SETL2: /* Set L2 to given protocol */
 346                 if (ch >= cs->channels) {
 347                         dev_err(cs->dev,
 348                                 "ISDN_CMD_SETL2: invalid channel (%d)\n", ch);
 349                         return -EINVAL;
 350                 }
 351                 bcs = cs->bcs + ch;
 352                 if (bcs->chstate & CHS_D_UP) {
 353                         dev_err(cs->dev,
 354                                 "ISDN_CMD_SETL2: channel active (%d)\n", ch);
 355                         return -EINVAL;
 356                 }
 357                 switch (cntrl->arg >> 8) {
 358                 case ISDN_PROTO_L2_HDLC:
 359                         gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL2: setting L2_HDLC");
 360                         bcs->proto2 = L2_HDLC;
 361                         break;
 362                 case ISDN_PROTO_L2_TRANS:
 363                         gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL2: setting L2_VOICE");
 364                         bcs->proto2 = L2_VOICE;
 365                         break;
 366                 default:
 367                         dev_err(cs->dev,
 368                                 "ISDN_CMD_SETL2: unsupported protocol (%lu)\n",
 369                                 cntrl->arg >> 8);
 370                         return -EINVAL;
 371                 }
 372                 break;
 373         case ISDN_CMD_SETL3: /* Set L3 to given protocol */
 374                 gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL3");
 375                 if (ch >= cs->channels) {
 376                         dev_err(cs->dev,
 377                                 "ISDN_CMD_SETL3: invalid channel (%d)\n", ch);
 378                         return -EINVAL;
 379                 }
 380
 381                 if (cntrl->arg >> 8 != ISDN_PROTO_L3_TRANS) {
 382                         dev_err(cs->dev,
 383                                 "ISDN_CMD_SETL3: unsupported protocol (%lu)\n",
 384                                 cntrl->arg >> 8);
 385                         return -EINVAL;
 386                 }
 387
 388                 break;
 389
 390         default:
 391                 gig_dbg(DEBUG_CMD, "unknown command %d from LL",
 392                         cntrl->command);
 393                 return -EINVAL;
 394         }
 395
 396         return retval;
 397
 398 oom:
 399         dev_err(bcs->cs->dev, "out of memory\n");
 400         for (i = 0; i < AT_NUM; ++i)
 401                 kfree(commands[i]);
 402         return -ENOMEM;
 403 }
 404
 405 static void gigaset_i4l_cmd(struct cardstate *cs, int cmd)
 406 {
 407         isdn_if *iif = cs->iif;
 408         isdn_ctrl command;
 409
 410         command.driver = cs->myid;
 411         command.command = cmd;
 412         command.arg = 0;
 413         iif->statcallb(&command);
 414 }
 415
 416 static void gigaset_i4l_channel_cmd(struct bc_state *bcs, int cmd)
 417 {
 418         isdn_if *iif = bcs->cs->iif;
 419         isdn_ctrl command;
 420
 421         command.driver = bcs->cs->myid;
 422         command.command = cmd;
 423         command.arg = bcs->channel;
 424         iif->statcallb(&command);
 425 }
 426
 427 /**
 428  * gigaset_isdn_icall() - signal incoming call
 429  * @at_state:   connection state structure.
 430  *
 431  * Called by main module to notify the LL that an incoming call has been
 432  * received. @at_state contains the parameters of the call.
 433  *
 434  * Return value: call disposition (ICALL_*)
 435  */
 436 int gigaset_isdn_icall(struct at_state_t *at_state)
 437 {
 438         struct cardstate *cs = at_state->cs;
 439         struct bc_state *bcs = at_state->bcs;
 440         isdn_if *iif = cs->iif;
 441         isdn_ctrl response;
 442         int retval;
 443
 444         /* fill ICALL structure */
 445         response.parm.setup.si1 = 0;    /* default: unknown */
 446         response.parm.setup.si2 = 0;
 447         response.parm.setup.screen = 0;
 448         response.parm.setup.plan = 0;
 449         if (!at_state->str_var[STR_ZBC]) {
 450                 /* no BC (internal call): assume speech, A-law */
 451                 response.parm.setup.si1 = 1;
 452         } else if (!strcmp(at_state->str_var[STR_ZBC], "8890")) {
 453                 /* unrestricted digital information */
 454                 response.parm.setup.si1 = 7;
 455         } else if (!strcmp(at_state->str_var[STR_ZBC], "8090A3")) {
 456                 /* speech, A-law */
 457                 response.parm.setup.si1 = 1;
 458         } else if (!strcmp(at_state->str_var[STR_ZBC], "9090A3")) {
 459                 /* 3,1 kHz audio, A-law */
 460                 response.parm.setup.si1 = 1;
 461                 response.parm.setup.si2 = 2;
 462         } else {
 463                 dev_warn(cs->dev, "RING ignored - unsupported BC %s\n",
 464                      at_state->str_var[STR_ZBC]);
 465                 return ICALL_IGNORE;
 466         }
 467         if (at_state->str_var[STR_NMBR]) {
 468                 strlcpy(response.parm.setup.phone, at_state->str_var[STR_NMBR],
 469                         sizeof response.parm.setup.phone);
 470         } else
 471                 response.parm.setup.phone[0] = 0;
 472         if (at_state->str_var[STR_ZCPN]) {
 473                 strlcpy(response.parm.setup.eazmsn, at_state->str_var[STR_ZCPN],
 474                         sizeof response.parm.setup.eazmsn);
 475         } else
 476                 response.parm.setup.eazmsn[0] = 0;
 477
 478         if (!bcs) {
 479                 dev_notice(cs->dev, "no channel for incoming call\n");
 480                 response.command = ISDN_STAT_ICALLW;
 481                 response.arg = 0;
 482         } else {
 483                 gig_dbg(DEBUG_CMD, "Sending ICALL");
 484                 response.command = ISDN_STAT_ICALL;
 485                 response.arg = bcs->channel;
 486         }
 487         response.driver = cs->myid;
 488         retval = iif->statcallb(&response);
 489         gig_dbg(DEBUG_CMD, "Response: %d", retval);
 490         switch (retval) {
 491         case 0: /* no takers */
 492                 return ICALL_IGNORE;
 493         case 1: /* alerting */
 494                 bcs->chstate |= CHS_NOTIFY_LL;
 495                 return ICALL_ACCEPT;
 496         case 2: /* reject */
 497                 return ICALL_REJECT;
 498         case 3: /* incomplete */
 499                 dev_warn(cs->dev,
 500                        "LL requested unsupported feature: Incomplete Number\n");
 501                 return ICALL_IGNORE;
 502         case 4: /* proceeding */
 503                 /* Gigaset will send ALERTING anyway.
 504                  * There doesn't seem to be a way to avoid this.
 505                  */
 506                 return ICALL_ACCEPT;
 507         case 5: /* deflect */
 508                 dev_warn(cs->dev,
 509                          "LL requested unsupported feature: Call Deflection\n");
 510                 return ICALL_IGNORE;
 511         default:
 512                 dev_err(cs->dev, "LL error %d on ICALL\n", retval);
 513                 return ICALL_IGNORE;
 514         }
 515 }
 516
 517 /**
 518  * gigaset_isdn_connD() - signal D channel connect
 519  * @bcs:        B channel descriptor structure.
 520  *
 521  * Called by main module to notify the LL that the D channel connection has
 522  * been established.
 523  */
 524 void gigaset_isdn_connD(struct bc_state *bcs)
 525 {
 526         gig_dbg(DEBUG_CMD, "sending DCONN");
 527         gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DCONN);
 528 }
 529
 530 /**
 531  * gigaset_isdn_hupD() - signal D channel hangup
 532  * @bcs:        B channel descriptor structure.
 533  *
 534  * Called by main module to notify the LL that the D channel connection has
 535  * been shut down.
 536  */
 537 void gigaset_isdn_hupD(struct bc_state *bcs)
 538 {
 539         gig_dbg(DEBUG_CMD, "sending DHUP");
 540         gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DHUP);
 541 }
 542
 543 /**
 544  * gigaset_isdn_connB() - signal B channel connect
 545  * @bcs:        B channel descriptor structure.
 546  *
 547  * Called by main module to notify the LL that the B channel connection has
 548  * been established.
 549  */
 550 void gigaset_isdn_connB(struct bc_state *bcs)
 551 {
 552         gig_dbg(DEBUG_CMD, "sending BCONN");
 553         gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BCONN);
 554 }
 555
 556 /**
 557  * gigaset_isdn_hupB() - signal B channel hangup
 558  * @bcs:        B channel descriptor structure.
 559  *
 560  * Called by main module to notify the LL that the B channel connection has
 561  * been shut down.
 562  */
 563 void gigaset_isdn_hupB(struct bc_state *bcs)
 564 {
 565         gig_dbg(DEBUG_CMD, "sending BHUP");
 566         gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BHUP);
 567 }
 568
 569 /**
 570  * gigaset_isdn_start() - signal device availability
 571  * @cs:         device descriptor structure.
 572  *
 573  * Called by main module to notify the LL that the device is available for
 574  * use.
 575  */
 576 void gigaset_isdn_start(struct cardstate *cs)
 577 {
 578         gig_dbg(DEBUG_CMD, "sending RUN");
 579         gigaset_i4l_cmd(cs, ISDN_STAT_RUN);
 580 }
 581
 582 /**
 583  * gigaset_isdn_stop() - signal device unavailability
 584  * @cs:         device descriptor structure.
 585  *
 586  * Called by main module to notify the LL that the device is no longer
 587  * available for use.
 588  */
 589 void gigaset_isdn_stop(struct cardstate *cs)
 590 {
 591         gig_dbg(DEBUG_CMD, "sending STOP");
 592         gigaset_i4l_cmd(cs, ISDN_STAT_STOP);
 593 }
 594
 595 /**
 596  * gigaset_isdn_regdev() - register to LL
 597  * @cs:         device descriptor structure.
 598  * @isdnid:     device name.
 599  *
 600  * Return value: 1 for success, 0 for failure
 601  */
 602 int gigaset_isdn_regdev(struct cardstate *cs, const char *isdnid)
 603 {
 604         isdn_if *iif;
 605
 606         pr_info("ISDN4Linux interface\n");
 607
 608         iif = kmalloc(sizeof *iif, GFP_KERNEL);
 609         if (!iif) {
 610                 pr_err("out of memory\n");
 611                 return 0;
 612         }
 613
 614         if (snprintf(iif->id, sizeof iif->id, "%s_%u", isdnid, cs->minor_index)
 615             >= sizeof iif->id) {
 616                 pr_err("ID too long: %s\n", isdnid);
 617                 kfree(iif);
 618                 return 0;
 619         }
 620
 621         iif->owner = THIS_MODULE;
 622         iif->channels = cs->channels;
 623         iif->maxbufsize = MAX_BUF_SIZE;
 624         iif->features = ISDN_FEATURE_L2_TRANS |
 625                 ISDN_FEATURE_L2_HDLC |
 626 #ifdef GIG_X75
 627                 ISDN_FEATURE_L2_X75I |
 628 #endif
 629                 ISDN_FEATURE_L3_TRANS |
 630                 ISDN_FEATURE_P_EURO;
 631         iif->hl_hdrlen = HW_HDR_LEN;            /* Area for storing ack */
 632         iif->command = command_from_LL;
 633         iif->writebuf_skb = writebuf_from_LL;
 634         iif->writecmd = NULL;                   /* Don't support isdnctrl */
 635         iif->readstat = NULL;                   /* Don't support isdnctrl */
 636         iif->rcvcallb_skb = NULL;               /* Will be set by LL */
 637         iif->statcallb = NULL;                  /* Will be set by LL */
 638
 639         if (!register_isdn(iif)) {
 640                 pr_err("register_isdn failed\n");
 641                 kfree(iif);
 642                 return 0;
 643         }
 644
 645         cs->iif = iif;
 646         cs->myid = iif->channels;               /* Set my device id */
 647         cs->hw_hdr_len = HW_HDR_LEN;
 648         return 1;
 649 }
 650
 651 /**
 652  * gigaset_isdn_unregdev() - unregister device from LL
 653  * @cs:         device descriptor structure.
 654  */
 655 void gigaset_isdn_unregdev(struct cardstate *cs)
 656 {
 657         gig_dbg(DEBUG_CMD, "sending UNLOAD");
 658         gigaset_i4l_cmd(cs, ISDN_STAT_UNLOAD);
 659         kfree(cs->iif);
 660         cs->iif = NULL;
 661 }
 662
 663 /**
 664  * gigaset_isdn_regdrv() - register driver to LL
 665  */
 666 void gigaset_isdn_regdrv(void)
 667 {
 668         /* nothing to do */
 669 }
 670
 671 /**
 672  * gigaset_isdn_unregdrv() - unregister driver from LL
 673  */
 674 void gigaset_isdn_unregdrv(void)
 675 {
 676         /* nothing to do */
 677 }