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
  19 #define HW_HDR_LEN      2       /* Header size used to store ack info */
  20
  21 /* == Handling of I4L IO =====================================================*/
  22
  23 /* writebuf_from_LL
  24  * called by LL to transmit data on an open channel
  25  * inserts the buffer data into the send queue and starts the transmission
  26  * Note that this operation must not sleep!
  27  * When the buffer is processed completely, gigaset_skb_sent() should be called.
  28  * parameters:
  29  *      driverID        driver ID as assigned by LL
  30  *      channel         channel number
  31  *      ack             if != 0 LL wants to be notified on completion via
  32  *                      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,
  40                             struct sk_buff *skb)
  41 {
  42         struct cardstate *cs = gigaset_get_cs_by_id(driverID);
  43         struct bc_state *bcs;
  44         unsigned char *ack_header;
  45         unsigned len;
  46
  47         if (!cs) {
  48                 pr_err("%s: invalid driver ID (%d)\n", __func__, driverID);
  49                 return -ENODEV;
  50         }
  51         if (channel < 0 || channel >= cs->channels) {
  52                 dev_err(cs->dev, "%s: invalid channel ID (%d)\n",
  53                         __func__, channel);
  54                 return -ENODEV;
  55         }
  56         bcs = &cs->bcs[channel];
  57
  58         /* can only handle linear sk_buffs */
  59         if (skb_linearize(skb) < 0) {
  60                 dev_err(cs->dev, "%s: skb_linearize failed\n", __func__);
  61                 return -ENOMEM;
  62         }
  63         len = skb->len;
  64
  65         gig_dbg(DEBUG_LLDATA,
  66                 "Receiving data from LL (id: %d, ch: %d, ack: %d, sz: %d)",
  67                 driverID, channel, ack, len);
  68
  69         if (!len) {
  70                 if (ack)
  71                         dev_notice(cs->dev, "%s: not ACKing empty packet\n",
  72                                    __func__);
  73                 return 0;
  74         }
  75         if (len > MAX_BUF_SIZE) {
  76                 dev_err(cs->dev, "%s: packet too large (%d bytes)\n",
  77                         __func__, len);
  78                 return -EINVAL;
  79         }
  80
  81         /* set up acknowledgement header */
  82         if (skb_headroom(skb) < HW_HDR_LEN) {
  83                 /* should never happen */
  84                 dev_err(cs->dev, "%s: insufficient skb headroom\n", __func__);
  85                 return -ENOMEM;
  86         }
  87         skb_set_mac_header(skb, -HW_HDR_LEN);
  88         skb->mac_len = HW_HDR_LEN;
  89         ack_header = skb_mac_header(skb);
  90         if (ack) {
  91                 ack_header[0] = len & 0xff;
  92                 ack_header[1] = len >> 8;
  93         } else {
  94                 ack_header[0] = ack_header[1] = 0;
  95         }
  96         gig_dbg(DEBUG_MCMD, "skb: len=%u, ack=%d: %02x %02x",
  97                 len, ack, ack_header[0], ack_header[1]);
  98
  99         /* pass to device-specific module */
 100         return cs->ops->send_skb(bcs, skb);
 101 }
 102
 103 /**
 104  * gigaset_skb_sent() - acknowledge sending an skb
 105  * @bcs:        B channel descriptor structure.
 106  * @skb:        sent data.
 107  *
 108  * Called by hardware module {bas,ser,usb}_gigaset when the data in a
 109  * skb has been successfully sent, for signalling completion to the LL.
 110  */
 111 void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb)
 112 {
 113         isdn_if *iif = bcs->cs->iif;
 114         unsigned char *ack_header = skb_mac_header(skb);
 115         unsigned len;
 116         isdn_ctrl response;
 117
 118         ++bcs->trans_up;
 119
 120         if (skb->len)
 121                 dev_warn(bcs->cs->dev, "%s: skb->len==%d\n",
 122                          __func__, skb->len);
 123
 124         len = ack_header[0] + ((unsigned) ack_header[1] << 8);
 125         if (len) {
 126                 gig_dbg(DEBUG_MCMD, "ACKing to LL (id: %d, ch: %d, sz: %u)",
 127                         bcs->cs->myid, bcs->channel, len);
 128
 129                 response.driver = bcs->cs->myid;
 130                 response.command = ISDN_STAT_BSENT;
 131                 response.arg = bcs->channel;
 132                 response.parm.length = len;
 133                 iif->statcallb(&response);
 134         }
 135 }
 136 EXPORT_SYMBOL_GPL(gigaset_skb_sent);
 137
 138 /**
 139  * gigaset_skb_rcvd() - pass received skb to LL
 140  * @bcs:        B channel descriptor structure.
 141  * @skb:        received data.
 142  *
 143  * Called by hardware module {bas,ser,usb}_gigaset when user data has
 144  * been successfully received, for passing to the LL.
 145  * Warning: skb must not be accessed anymore!
 146  */
 147 void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb)
 148 {
 149         isdn_if *iif = bcs->cs->iif;
 150
 151         iif->rcvcallb_skb(bcs->cs->myid, bcs->channel, skb);
 152         bcs->trans_down++;
 153 }
 154 EXPORT_SYMBOL_GPL(gigaset_skb_rcvd);
 155
 156 /**
 157  * gigaset_isdn_rcv_err() - signal receive error
 158  * @bcs:        B channel descriptor structure.
 159  *
 160  * Called by hardware module {bas,ser,usb}_gigaset when a receive error
 161  * has occurred, for signalling to the LL.
 162  */
 163 void gigaset_isdn_rcv_err(struct bc_state *bcs)
 164 {
 165         isdn_if *iif = bcs->cs->iif;
 166         isdn_ctrl response;
 167
 168         /* if currently ignoring packets, just count down */
 169         if (bcs->ignore) {
 170                 bcs->ignore--;
 171                 return;
 172         }
 173
 174         /* update statistics */
 175         bcs->corrupted++;
 176
 177         /* error -> LL */
 178         gig_dbg(DEBUG_CMD, "sending L1ERR");
 179         response.driver = bcs->cs->myid;
 180         response.command = ISDN_STAT_L1ERR;
 181         response.arg = bcs->channel;
 182         response.parm.errcode = ISDN_STAT_L1ERR_RECV;
 183         iif->statcallb(&response);
 184 }
 185 EXPORT_SYMBOL_GPL(gigaset_isdn_rcv_err);
 186
 187 /* This function will be called by LL to send commands
 188  * NOTE: LL ignores the returned value, for commands other than ISDN_CMD_IOCTL,
 189  * so don't put too much effort into it.
 190  */
 191 static int command_from_LL(isdn_ctrl *cntrl)
 192 {
 193         struct cardstate *cs;
 194         struct bc_state *bcs;
 195         int retval = 0;
 196         char **commands;
 197         int ch;
 198         int i;
 199         size_t l;
 200
 201         gigaset_debugdrivers();
 202
 203         gig_dbg(DEBUG_CMD, "driver: %d, command: %d, arg: 0x%lx",
 204                 cntrl->driver, cntrl->command, cntrl->arg);
 205
 206         cs = gigaset_get_cs_by_id(cntrl->driver);
 207         if (cs == NULL) {
 208                 pr_err("%s: invalid driver ID (%d)\n", __func__, cntrl->driver);
 209                 return -ENODEV;
 210         }
 211         ch = cntrl->arg & 0xff;
 212
 213         switch (cntrl->command) {
 214         case ISDN_CMD_IOCTL:
 215                 dev_warn(cs->dev, "ISDN_CMD_IOCTL not supported\n");
 216                 return -EINVAL;
 217
 218         case ISDN_CMD_DIAL:
 219                 gig_dbg(DEBUG_ANY,
 220                         "ISDN_CMD_DIAL (phone: %s, msn: %s, si1: %d, si2: %d)",
 221                         cntrl->parm.setup.phone, cntrl->parm.setup.eazmsn,
 222                         cntrl->parm.setup.si1, cntrl->parm.setup.si2);
 223
 224                 if (ch >= cs->channels) {
 225                         dev_err(cs->dev,
 226                                 "ISDN_CMD_DIAL: invalid channel (%d)\n", ch);
 227                         return -EINVAL;
 228                 }
 229                 bcs = cs->bcs + ch;
 230                 if (!gigaset_get_channel(bcs)) {
 231                         dev_err(cs->dev, "ISDN_CMD_DIAL: channel not free\n");
 232                         return -EBUSY;
 233                 }
 234
 235                 commands = kzalloc(AT_NUM*(sizeof *commands), GFP_ATOMIC);
 236                 if (!commands) {
 237                         gigaset_free_channel(bcs);
 238                         dev_err(cs->dev, "ISDN_CMD_DIAL: out of memory\n");
 239                         return -ENOMEM;
 240                 }
 241
 242                 l = 3 + strlen(cntrl->parm.setup.phone);
 243                 commands[AT_DIAL] = kmalloc(l, GFP_ATOMIC);
 244                 if (!commands[AT_DIAL])
 245                         goto oom;
 246                 if (cntrl->parm.setup.phone[0] == '*' &&
 247                     cntrl->parm.setup.phone[1] == '*') {
 248                         /* internal call: translate ** prefix to CTP value */
 249                         commands[AT_TYPE] = kstrdup("^SCTP=0\r", GFP_ATOMIC);
 250                         if (!commands[AT_TYPE])
 251                                 goto oom;
 252                         snprintf(commands[AT_DIAL], l,
 253                                  "D%s\r", cntrl->parm.setup.phone+2);
 254                 } else {
 255                         commands[AT_TYPE] = kstrdup("^SCTP=1\r", GFP_ATOMIC);
 256                         if (!commands[AT_TYPE])
 257                                 goto oom;
 258                         snprintf(commands[AT_DIAL], l,
 259                                  "D%s\r", cntrl->parm.setup.phone);
 260                 }
 261
 262                 l = strlen(cntrl->parm.setup.eazmsn);
 263                 if (l) {
 264                         l += 8;
 265                         commands[AT_MSN] = kmalloc(l, GFP_ATOMIC);
 266                         if (!commands[AT_MSN])
 267                                 goto oom;
 268                         snprintf(commands[AT_MSN], l, "^SMSN=%s\r",
 269                                  cntrl->parm.setup.eazmsn);
 270                 }
 271
 272                 switch (cntrl->parm.setup.si1) {
 273                 case 1:         /* audio */
 274                         /* BC = 9090A3: 3.1 kHz audio, A-law */
 275                         commands[AT_BC] = kstrdup("^SBC=9090A3\r", GFP_ATOMIC);
 276                         if (!commands[AT_BC])
 277                                 goto oom;
 278                         break;
 279                 case 7:         /* data */
 280                 default:        /* hope the app knows what it is doing */
 281                         /* BC = 8890: unrestricted digital information */
 282                         commands[AT_BC] = kstrdup("^SBC=8890\r", GFP_ATOMIC);
 283                         if (!commands[AT_BC])
 284                                 goto oom;
 285                 }
 286                 /* ToDo: other si1 values, inspect si2, set HLC/LLC */
 287
 288                 commands[AT_PROTO] = kmalloc(9, GFP_ATOMIC);
 289                 if (!commands[AT_PROTO])
 290                         goto oom;
 291                 snprintf(commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
 292
 293                 commands[AT_ISO] = kmalloc(9, GFP_ATOMIC);
 294                 if (!commands[AT_ISO])
 295                         goto oom;
 296                 snprintf(commands[AT_ISO], 9, "^SISO=%u\r",
 297                          (unsigned) bcs->channel + 1);
 298
 299                 if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, commands,
 300                                        bcs->at_state.seq_index, NULL)) {
 301                         for (i = 0; i < AT_NUM; ++i)
 302                                 kfree(commands[i]);
 303                         kfree(commands);
 304                         gigaset_free_channel(bcs);
 305                         return -ENOMEM;
 306                 }
 307
 308                 gig_dbg(DEBUG_CMD, "scheduling DIAL");
 309                 gigaset_schedule_event(cs);
 310                 break;
 311         case 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
 322                 gig_dbg(DEBUG_CMD, "scheduling ACCEPT");
 323                 gigaset_schedule_event(cs);
 324
 325                 break;
 326         case ISDN_CMD_ACCEPTB:
 327                 break;
 328         case ISDN_CMD_HANGUP:
 329                 if (ch >= cs->channels) {
 330                         dev_err(cs->dev,
 331                                 "ISDN_CMD_HANGUP: invalid channel (%d)\n", ch);
 332                         return -EINVAL;
 333                 }
 334                 bcs = cs->bcs + ch;
 335                 if (!gigaset_add_event(cs, &bcs->at_state,
 336                                        EV_HUP, NULL, 0, NULL))
 337                         return -ENOMEM;
 338
 339                 gig_dbg(DEBUG_CMD, "scheduling HUP");
 340                 gigaset_schedule_event(cs);
 341
 342                 break;
 343         case ISDN_CMD_CLREAZ: /* Do not signal incoming signals */
 344                 dev_info(cs->dev, "ignoring ISDN_CMD_CLREAZ\n");
 345                 break;
 346         case ISDN_CMD_SETEAZ: /* Signal incoming calls for given MSN */
 347                 dev_info(cs->dev, "ignoring ISDN_CMD_SETEAZ (%s)\n",
 348                          cntrl->parm.num);
 349                 break;
 350         case ISDN_CMD_SETL2: /* Set L2 to given protocol */
 351                 if (ch >= cs->channels) {
 352                         dev_err(cs->dev,
 353                                 "ISDN_CMD_SETL2: invalid channel (%d)\n", ch);
 354                         return -EINVAL;
 355                 }
 356                 bcs = cs->bcs + ch;
 357                 if (bcs->chstate & CHS_D_UP) {
 358                         dev_err(cs->dev,
 359                                 "ISDN_CMD_SETL2: channel active (%d)\n", ch);
 360                         return -EINVAL;
 361                 }
 362                 switch (cntrl->arg >> 8) {
 363                 case ISDN_PROTO_L2_HDLC:
 364                         gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL2: setting L2_HDLC");
 365                         bcs->proto2 = L2_HDLC;
 366                         break;
 367                 case ISDN_PROTO_L2_TRANS:
 368                         gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL2: setting L2_VOICE");
 369                         bcs->proto2 = L2_VOICE;
 370                         break;
 371                 default:
 372                         dev_err(cs->dev,
 373                                 "ISDN_CMD_SETL2: unsupported protocol (%lu)\n",
 374                                 cntrl->arg >> 8);
 375                         return -EINVAL;
 376                 }
 377                 break;
 378         case ISDN_CMD_SETL3: /* Set L3 to given protocol */
 379                 if (ch >= cs->channels) {
 380                         dev_err(cs->dev,
 381                                 "ISDN_CMD_SETL3: invalid channel (%d)\n", ch);
 382                         return -EINVAL;
 383                 }
 384
 385                 if (cntrl->arg >> 8 != ISDN_PROTO_L3_TRANS) {
 386                         dev_err(cs->dev,
 387                                 "ISDN_CMD_SETL3: unsupported protocol (%lu)\n",
 388                                 cntrl->arg >> 8);
 389                         return -EINVAL;
 390                 }
 391
 392                 break;
 393         case ISDN_CMD_PROCEED:
 394                 gig_dbg(DEBUG_ANY, "ISDN_CMD_PROCEED");
 395                 break;
 396         case ISDN_CMD_ALERT:
 397                 gig_dbg(DEBUG_ANY, "ISDN_CMD_ALERT");
 398                 if (cntrl->arg >= cs->channels) {
 399                         dev_err(cs->dev,
 400                                 "ISDN_CMD_ALERT: invalid channel (%d)\n",
 401                                 (int) cntrl->arg);
 402                         return -EINVAL;
 403                 }
 404                 break;
 405         case ISDN_CMD_REDIR:
 406                 gig_dbg(DEBUG_ANY, "ISDN_CMD_REDIR");
 407                 break;
 408         case ISDN_CMD_PROT_IO:
 409                 gig_dbg(DEBUG_ANY, "ISDN_CMD_PROT_IO");
 410                 break;
 411         case ISDN_CMD_FAXCMD:
 412                 gig_dbg(DEBUG_ANY, "ISDN_CMD_FAXCMD");
 413                 break;
 414         case ISDN_CMD_GETL2:
 415                 gig_dbg(DEBUG_ANY, "ISDN_CMD_GETL2");
 416                 break;
 417         case ISDN_CMD_GETL3:
 418                 gig_dbg(DEBUG_ANY, "ISDN_CMD_GETL3");
 419                 break;
 420         case ISDN_CMD_GETEAZ:
 421                 gig_dbg(DEBUG_ANY, "ISDN_CMD_GETEAZ");
 422                 break;
 423         case ISDN_CMD_SETSIL:
 424                 gig_dbg(DEBUG_ANY, "ISDN_CMD_SETSIL");
 425                 break;
 426         case ISDN_CMD_GETSIL:
 427                 gig_dbg(DEBUG_ANY, "ISDN_CMD_GETSIL");
 428                 break;
 429         default:
 430                 dev_err(cs->dev, "unknown command %d from LL\n",
 431                         cntrl->command);
 432                 return -EINVAL;
 433         }
 434
 435         return retval;
 436
 437 oom:
 438         dev_err(bcs->cs->dev, "out of memory\n");
 439         for (i = 0; i < AT_NUM; ++i)
 440                 kfree(commands[i]);
 441         return -ENOMEM;
 442 }
 443
 444 static void gigaset_i4l_cmd(struct cardstate *cs, int cmd)
 445 {
 446         isdn_if *iif = cs->iif;
 447         isdn_ctrl command;
 448
 449         command.driver = cs->myid;
 450         command.command = cmd;
 451         command.arg = 0;
 452         iif->statcallb(&command);
 453 }
 454
 455 static void gigaset_i4l_channel_cmd(struct bc_state *bcs, int cmd)
 456 {
 457         isdn_if *iif = bcs->cs->iif;
 458         isdn_ctrl command;
 459
 460         command.driver = bcs->cs->myid;
 461         command.command = cmd;
 462         command.arg = bcs->channel;
 463         iif->statcallb(&command);
 464 }
 465
 466 /**
 467  * gigaset_isdn_icall() - signal incoming call
 468  * @at_state:   connection state structure.
 469  *
 470  * Called by main module to notify the LL that an incoming call has been
 471  * received. @at_state contains the parameters of the call.
 472  *
 473  * Return value: call disposition (ICALL_*)
 474  */
 475 int gigaset_isdn_icall(struct at_state_t *at_state)
 476 {
 477         struct cardstate *cs = at_state->cs;
 478         struct bc_state *bcs = at_state->bcs;
 479         isdn_if *iif = cs->iif;
 480         isdn_ctrl response;
 481         int retval;
 482
 483         /* fill ICALL structure */
 484         response.parm.setup.si1 = 0;    /* default: unknown */
 485         response.parm.setup.si2 = 0;
 486         response.parm.setup.screen = 0;
 487         response.parm.setup.plan = 0;
 488         if (!at_state->str_var[STR_ZBC]) {
 489                 /* no BC (internal call): assume speech, A-law */
 490                 response.parm.setup.si1 = 1;
 491         } else if (!strcmp(at_state->str_var[STR_ZBC], "8890")) {
 492                 /* unrestricted digital information */
 493                 response.parm.setup.si1 = 7;
 494         } else if (!strcmp(at_state->str_var[STR_ZBC], "8090A3")) {
 495                 /* speech, A-law */
 496                 response.parm.setup.si1 = 1;
 497         } else if (!strcmp(at_state->str_var[STR_ZBC], "9090A3")) {
 498                 /* 3,1 kHz audio, A-law */
 499                 response.parm.setup.si1 = 1;
 500                 response.parm.setup.si2 = 2;
 501         } else {
 502                 dev_warn(cs->dev, "RING ignored - unsupported BC %s\n",
 503                      at_state->str_var[STR_ZBC]);
 504                 return ICALL_IGNORE;
 505         }
 506         if (at_state->str_var[STR_NMBR]) {
 507                 strlcpy(response.parm.setup.phone, at_state->str_var[STR_NMBR],
 508                         sizeof response.parm.setup.phone);
 509         } else
 510                 response.parm.setup.phone[0] = 0;
 511         if (at_state->str_var[STR_ZCPN]) {
 512                 strlcpy(response.parm.setup.eazmsn, at_state->str_var[STR_ZCPN],
 513                         sizeof response.parm.setup.eazmsn);
 514         } else
 515                 response.parm.setup.eazmsn[0] = 0;
 516
 517         if (!bcs) {
 518                 dev_notice(cs->dev, "no channel for incoming call\n");
 519                 response.command = ISDN_STAT_ICALLW;
 520                 response.arg = 0;
 521         } else {
 522                 gig_dbg(DEBUG_CMD, "Sending ICALL");
 523                 response.command = ISDN_STAT_ICALL;
 524                 response.arg = bcs->channel;
 525         }
 526         response.driver = cs->myid;
 527         retval = iif->statcallb(&response);
 528         gig_dbg(DEBUG_CMD, "Response: %d", retval);
 529         switch (retval) {
 530         case 0: /* no takers */
 531                 return ICALL_IGNORE;
 532         case 1: /* alerting */
 533                 bcs->chstate |= CHS_NOTIFY_LL;
 534                 return ICALL_ACCEPT;
 535         case 2: /* reject */
 536                 return ICALL_REJECT;
 537         case 3: /* incomplete */
 538                 dev_warn(cs->dev,
 539                        "LL requested unsupported feature: Incomplete Number\n");
 540                 return ICALL_IGNORE;
 541         case 4: /* proceeding */
 542                 /* Gigaset will send ALERTING anyway.
 543                  * There doesn't seem to be a way to avoid this.
 544                  */
 545                 return ICALL_ACCEPT;
 546         case 5: /* deflect */
 547                 dev_warn(cs->dev,
 548                          "LL requested unsupported feature: Call Deflection\n");
 549                 return ICALL_IGNORE;
 550         default:
 551                 dev_err(cs->dev, "LL error %d on ICALL\n", retval);
 552                 return ICALL_IGNORE;
 553         }
 554 }
 555
 556 /**
 557  * gigaset_isdn_connD() - signal D channel connect
 558  * @bcs:        B channel descriptor structure.
 559  *
 560  * Called by main module to notify the LL that the D channel connection has
 561  * been established.
 562  */
 563 void gigaset_isdn_connD(struct bc_state *bcs)
 564 {
 565         gig_dbg(DEBUG_CMD, "sending DCONN");
 566         gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DCONN);
 567 }
 568
 569 /**
 570  * gigaset_isdn_hupD() - signal D channel hangup
 571  * @bcs:        B channel descriptor structure.
 572  *
 573  * Called by main module to notify the LL that the D channel connection has
 574  * been shut down.
 575  */
 576 void gigaset_isdn_hupD(struct bc_state *bcs)
 577 {
 578         gig_dbg(DEBUG_CMD, "sending DHUP");
 579         gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DHUP);
 580 }
 581
 582 /**
 583  * gigaset_isdn_connB() - signal B channel connect
 584  * @bcs:        B channel descriptor structure.
 585  *
 586  * Called by main module to notify the LL that the B channel connection has
 587  * been established.
 588  */
 589 void gigaset_isdn_connB(struct bc_state *bcs)
 590 {
 591         gig_dbg(DEBUG_CMD, "sending BCONN");
 592         gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BCONN);
 593 }
 594
 595 /**
 596  * gigaset_isdn_hupB() - signal B channel hangup
 597  * @bcs:        B channel descriptor structure.
 598  *
 599  * Called by main module to notify the LL that the B channel connection has
 600  * been shut down.
 601  */
 602 void gigaset_isdn_hupB(struct bc_state *bcs)
 603 {
 604         gig_dbg(DEBUG_CMD, "sending BHUP");
 605         gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BHUP);
 606 }
 607
 608 /**
 609  * gigaset_isdn_start() - signal device availability
 610  * @cs:         device descriptor structure.
 611  *
 612  * Called by main module to notify the LL that the device is available for
 613  * use.
 614  */
 615 void gigaset_isdn_start(struct cardstate *cs)
 616 {
 617         gig_dbg(DEBUG_CMD, "sending RUN");
 618         gigaset_i4l_cmd(cs, ISDN_STAT_RUN);
 619 }
 620
 621 /**
 622  * gigaset_isdn_stop() - signal device unavailability
 623  * @cs:         device descriptor structure.
 624  *
 625  * Called by main module to notify the LL that the device is no longer
 626  * available for use.
 627  */
 628 void gigaset_isdn_stop(struct cardstate *cs)
 629 {
 630         gig_dbg(DEBUG_CMD, "sending STOP");
 631         gigaset_i4l_cmd(cs, ISDN_STAT_STOP);
 632 }
 633
 634 /**
 635  * gigaset_isdn_register() - register to LL
 636  * @cs:         device descriptor structure.
 637  * @isdnid:     device name.
 638  *
 639  * Called by main module to register the device with the LL.
 640  *
 641  * Return value: 1 for success, 0 for failure
 642  */
 643 int gigaset_isdn_register(struct cardstate *cs, const char *isdnid)
 644 {
 645         isdn_if *iif;
 646
 647         pr_info("ISDN4Linux interface\n");
 648
 649         iif = kmalloc(sizeof *iif, GFP_KERNEL);
 650         if (!iif) {
 651                 pr_err("out of memory\n");
 652                 return 0;
 653         }
 654
 655         if (snprintf(iif->id, sizeof iif->id, "%s_%u", isdnid, cs->minor_index)
 656             >= sizeof iif->id) {
 657                 pr_err("ID too long: %s\n", isdnid);
 658                 kfree(iif);
 659                 return 0;
 660         }
 661
 662         iif->owner = THIS_MODULE;
 663         iif->channels = cs->channels;
 664         iif->maxbufsize = MAX_BUF_SIZE;
 665         iif->features = ISDN_FEATURE_L2_TRANS |
 666                 ISDN_FEATURE_L2_HDLC |
 667 #ifdef GIG_X75
 668                 ISDN_FEATURE_L2_X75I |
 669 #endif
 670                 ISDN_FEATURE_L3_TRANS |
 671                 ISDN_FEATURE_P_EURO;
 672         iif->hl_hdrlen = HW_HDR_LEN;            /* Area for storing ack */
 673         iif->command = command_from_LL;
 674         iif->writebuf_skb = writebuf_from_LL;
 675         iif->writecmd = NULL;                   /* Don't support isdnctrl */
 676         iif->readstat = NULL;                   /* Don't support isdnctrl */
 677         iif->rcvcallb_skb = NULL;               /* Will be set by LL */
 678         iif->statcallb = NULL;                  /* Will be set by LL */
 679
 680         if (!register_isdn(iif)) {
 681                 pr_err("register_isdn failed\n");
 682                 kfree(iif);
 683                 return 0;
 684         }
 685
 686         cs->iif = iif;
 687         cs->myid = iif->channels;               /* Set my device id */
 688         cs->hw_hdr_len = HW_HDR_LEN;
 689         return 1;
 690 }
 691
 692 /**
 693  * gigaset_isdn_unregister() - unregister from LL
 694  * @cs:         device descriptor structure.
 695  *
 696  * Called by main module to unregister the device from the LL.
 697  */
 698 void gigaset_isdn_unregister(struct cardstate *cs)
 699 {
 700         gig_dbg(DEBUG_CMD, "sending UNLOAD");
 701         gigaset_i4l_cmd(cs, ISDN_STAT_UNLOAD);
 702         kfree(cs->iif);
 703         cs->iif = NULL;
 704 }