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 SBUFSIZE        4096    /* sk_buff payload size */
  20 #define TRANSBUFSIZE    768     /* bytes per skb for transparent receive */
  21 #define HW_HDR_LEN      2       /* Header size used to store ack info */
  22 #define MAX_BUF_SIZE    (SBUFSIZE - HW_HDR_LEN) /* max data packet from LL */
  23
  24 /* == Handling of I4L IO =====================================================*/
  25
  26 /* writebuf_from_LL
  27  * called by LL to transmit data on an open channel
  28  * inserts the buffer data into the send queue and starts the transmission
  29  * Note that this operation must not sleep!
  30  * When the buffer is processed completely, gigaset_skb_sent() should be called.
  31  * parameters:
  32  *      driverID        driver ID as assigned by LL
  33  *      channel         channel number
  34  *      ack             if != 0 LL wants to be notified on completion via
  35  *                      statcallb(ISDN_STAT_BSENT)
  36  *      skb             skb containing data to send
  37  * return value:
  38  *      number of accepted bytes
  39  *      0 if temporarily unable to accept data (out of buffer space)
  40  *      <0 on error (eg. -EINVAL)
  41  */
  42 static int writebuf_from_LL(int driverID, int channel, int ack,
  43                             struct sk_buff *skb)
  44 {
  45         struct cardstate *cs = gigaset_get_cs_by_id(driverID);
  46         struct bc_state *bcs;
  47         unsigned char *ack_header;
  48         unsigned len;
  49
  50         if (!cs) {
  51                 pr_err("%s: invalid driver ID (%d)\n", __func__, driverID);
  52                 return -ENODEV;
  53         }
  54         if (channel < 0 || channel >= cs->channels) {
  55                 dev_err(cs->dev, "%s: invalid channel ID (%d)\n",
  56                         __func__, channel);
  57                 return -ENODEV;
  58         }
  59         bcs = &cs->bcs[channel];
  60
  61         /* can only handle linear sk_buffs */
  62         if (skb_linearize(skb) < 0) {
  63                 dev_err(cs->dev, "%s: skb_linearize failed\n", __func__);
  64                 return -ENOMEM;
  65         }
  66         len = skb->len;
  67
  68         gig_dbg(DEBUG_LLDATA,
  69                 "Receiving data from LL (id: %d, ch: %d, ack: %d, sz: %d)",
  70                 driverID, channel, ack, len);
  71
  72         if (!len) {
  73                 if (ack)
  74                         dev_notice(cs->dev, "%s: not ACKing empty packet\n",
  75                                    __func__);
  76                 return 0;
  77         }
  78         if (len > MAX_BUF_SIZE) {
  79                 dev_err(cs->dev, "%s: packet too large (%d bytes)\n",
  80                         __func__, len);
  81                 return -EINVAL;
  82         }
  83
  84         /* set up acknowledgement header */
  85         if (skb_headroom(skb) < HW_HDR_LEN) {
  86                 /* should never happen */
  87                 dev_err(cs->dev, "%s: insufficient skb headroom\n", __func__);
  88                 return -ENOMEM;
  89         }
  90         skb_set_mac_header(skb, -HW_HDR_LEN);
  91         skb->mac_len = HW_HDR_LEN;
  92         ack_header = skb_mac_header(skb);
  93         if (ack) {
  94                 ack_header[0] = len & 0xff;
  95                 ack_header[1] = len >> 8;
  96         } else {
  97                 ack_header[0] = ack_header[1] = 0;
  98         }
  99         gig_dbg(DEBUG_MCMD, "skb: len=%u, ack=%d: %02x %02x",
 100                 len, ack, ack_header[0], ack_header[1]);
 101
 102         /* pass to device-specific module */
 103         return cs->ops->send_skb(bcs, skb);
 104 }
 105
 106 /**
 107  * gigaset_skb_sent() - acknowledge sending an skb
 108  * @bcs:        B channel descriptor structure.
 109  * @skb:        sent data.
 110  *
 111  * Called by hardware module {bas,ser,usb}_gigaset when the data in a
 112  * skb has been successfully sent, for signalling completion to the LL.
 113  */
 114 void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb)
 115 {
 116         isdn_if *iif = bcs->cs->iif;
 117         unsigned char *ack_header = skb_mac_header(skb);
 118         unsigned len;
 119         isdn_ctrl response;
 120
 121         ++bcs->trans_up;
 122
 123         if (skb->len)
 124                 dev_warn(bcs->cs->dev, "%s: skb->len==%d\n",
 125                          __func__, skb->len);
 126
 127         len = ack_header[0] + ((unsigned) ack_header[1] << 8);
 128         if (len) {
 129                 gig_dbg(DEBUG_MCMD, "ACKing to LL (id: %d, ch: %d, sz: %u)",
 130                         bcs->cs->myid, bcs->channel, len);
 131
 132                 response.driver = bcs->cs->myid;
 133                 response.command = ISDN_STAT_BSENT;
 134                 response.arg = bcs->channel;
 135                 response.parm.length = len;
 136                 iif->statcallb(&response);
 137         }
 138 }
 139 EXPORT_SYMBOL_GPL(gigaset_skb_sent);
 140
 141 /**
 142  * gigaset_skb_rcvd() - pass received skb to LL
 143  * @bcs:        B channel descriptor structure.
 144  * @skb:        received data.
 145  *
 146  * Called by hardware module {bas,ser,usb}_gigaset when user data has
 147  * been successfully received, for passing to the LL.
 148  * Warning: skb must not be accessed anymore!
 149  */
 150 void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb)
 151 {
 152         isdn_if *iif = bcs->cs->iif;
 153
 154         iif->rcvcallb_skb(bcs->cs->myid, bcs->channel, skb);
 155         bcs->trans_down++;
 156 }
 157 EXPORT_SYMBOL_GPL(gigaset_skb_rcvd);
 158
 159 /**
 160  * gigaset_isdn_rcv_err() - signal receive error
 161  * @bcs:        B channel descriptor structure.
 162  *
 163  * Called by hardware module {bas,ser,usb}_gigaset when a receive error
 164  * has occurred, for signalling to the LL.
 165  */
 166 void gigaset_isdn_rcv_err(struct bc_state *bcs)
 167 {
 168         isdn_if *iif = bcs->cs->iif;
 169         isdn_ctrl response;
 170
 171         /* if currently ignoring packets, just count down */
 172         if (bcs->ignore) {
 173                 bcs->ignore--;
 174                 return;
 175         }
 176
 177         /* update statistics */
 178         bcs->corrupted++;
 179
 180         /* error -> LL */
 181         gig_dbg(DEBUG_CMD, "sending L1ERR");
 182         response.driver = bcs->cs->myid;
 183         response.command = ISDN_STAT_L1ERR;
 184         response.arg = bcs->channel;
 185         response.parm.errcode = ISDN_STAT_L1ERR_RECV;
 186         iif->statcallb(&response);
 187 }
 188 EXPORT_SYMBOL_GPL(gigaset_isdn_rcv_err);
 189
 190 /* This function will be called by LL to send commands
 191  * NOTE: LL ignores the returned value, for commands other than ISDN_CMD_IOCTL,
 192  * so don't put too much effort into it.
 193  */
 194 static int command_from_LL(isdn_ctrl *cntrl)
 195 {
 196         struct cardstate *cs;
 197         struct bc_state *bcs;
 198         int retval = 0;
 199         char **commands;
 200         int ch;
 201         int i;
 202         size_t l;
 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                 switch (bcs->proto2) {
 236                 case L2_HDLC:
 237                         bcs->rx_bufsize = SBUFSIZE;
 238                         break;
 239                 default:                        /* assume transparent */
 240                         bcs->rx_bufsize = TRANSBUFSIZE;
 241                 }
 242                 dev_kfree_skb(bcs->rx_skb);
 243                 gigaset_new_rx_skb(bcs);
 244
 245                 commands = kzalloc(AT_NUM*(sizeof *commands), GFP_ATOMIC);
 246                 if (!commands) {
 247                         gigaset_free_channel(bcs);
 248                         dev_err(cs->dev, "ISDN_CMD_DIAL: out of memory\n");
 249                         return -ENOMEM;
 250                 }
 251
 252                 l = 3 + strlen(cntrl->parm.setup.phone);
 253                 commands[AT_DIAL] = kmalloc(l, GFP_ATOMIC);
 254                 if (!commands[AT_DIAL])
 255                         goto oom;
 256                 if (cntrl->parm.setup.phone[0] == '*' &&
 257                     cntrl->parm.setup.phone[1] == '*') {
 258                         /* internal call: translate ** prefix to CTP value */
 259                         commands[AT_TYPE] = kstrdup("^SCTP=0\r", GFP_ATOMIC);
 260                         if (!commands[AT_TYPE])
 261                                 goto oom;
 262                         snprintf(commands[AT_DIAL], l,
 263                                  "D%s\r", cntrl->parm.setup.phone+2);
 264                 } else {
 265                         commands[AT_TYPE] = kstrdup("^SCTP=1\r", GFP_ATOMIC);
 266                         if (!commands[AT_TYPE])
 267                                 goto oom;
 268                         snprintf(commands[AT_DIAL], l,
 269                                  "D%s\r", cntrl->parm.setup.phone);
 270                 }
 271
 272                 l = strlen(cntrl->parm.setup.eazmsn);
 273                 if (l) {
 274                         l += 8;
 275                         commands[AT_MSN] = kmalloc(l, GFP_ATOMIC);
 276                         if (!commands[AT_MSN])
 277                                 goto oom;
 278                         snprintf(commands[AT_MSN], l, "^SMSN=%s\r",
 279                                  cntrl->parm.setup.eazmsn);
 280                 }
 281
 282                 switch (cntrl->parm.setup.si1) {
 283                 case 1:         /* audio */
 284                         /* BC = 9090A3: 3.1 kHz audio, A-law */
 285                         commands[AT_BC] = kstrdup("^SBC=9090A3\r", GFP_ATOMIC);
 286                         if (!commands[AT_BC])
 287                                 goto oom;
 288                         break;
 289                 case 7:         /* data */
 290                 default:        /* hope the app knows what it is doing */
 291                         /* BC = 8890: unrestricted digital information */
 292                         commands[AT_BC] = kstrdup("^SBC=8890\r", GFP_ATOMIC);
 293                         if (!commands[AT_BC])
 294                                 goto oom;
 295                 }
 296                 /* ToDo: other si1 values, inspect si2, set HLC/LLC */
 297
 298                 commands[AT_PROTO] = kmalloc(9, GFP_ATOMIC);
 299                 if (!commands[AT_PROTO])
 300                         goto oom;
 301                 snprintf(commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
 302
 303                 commands[AT_ISO] = kmalloc(9, GFP_ATOMIC);
 304                 if (!commands[AT_ISO])
 305                         goto oom;
 306                 snprintf(commands[AT_ISO], 9, "^SISO=%u\r",
 307                          (unsigned) bcs->channel + 1);
 308
 309                 if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, commands,
 310                                        bcs->at_state.seq_index, NULL)) {
 311                         for (i = 0; i < AT_NUM; ++i)
 312                                 kfree(commands[i]);
 313                         kfree(commands);
 314                         gigaset_free_channel(bcs);
 315                         return -ENOMEM;
 316                 }
 317                 gigaset_schedule_event(cs);
 318                 break;
 319         case ISDN_CMD_ACCEPTD:
 320                 gig_dbg(DEBUG_CMD, "ISDN_CMD_ACCEPTD");
 321                 if (ch >= cs->channels) {
 322                         dev_err(cs->dev,
 323                                 "ISDN_CMD_ACCEPTD: invalid channel (%d)\n", ch);
 324                         return -EINVAL;
 325                 }
 326                 bcs = cs->bcs + ch;
 327                 switch (bcs->proto2) {
 328                 case L2_HDLC:
 329                         bcs->rx_bufsize = SBUFSIZE;
 330                         break;
 331                 default:                        /* assume transparent */
 332                         bcs->rx_bufsize = TRANSBUFSIZE;
 333                 }
 334                 dev_kfree_skb(bcs->rx_skb);
 335                 gigaset_new_rx_skb(bcs);
 336                 if (!gigaset_add_event(cs, &bcs->at_state,
 337                                        EV_ACCEPT, NULL, 0, NULL))
 338                         return -ENOMEM;
 339                 gigaset_schedule_event(cs);
 340
 341                 break;
 342         case ISDN_CMD_HANGUP:
 343                 gig_dbg(DEBUG_CMD, "ISDN_CMD_HANGUP");
 344                 if (ch >= cs->channels) {
 345                         dev_err(cs->dev,
 346                                 "ISDN_CMD_HANGUP: invalid channel (%d)\n", ch);
 347                         return -EINVAL;
 348                 }
 349                 bcs = cs->bcs + ch;
 350                 if (!gigaset_add_event(cs, &bcs->at_state,
 351                                        EV_HUP, NULL, 0, NULL))
 352                         return -ENOMEM;
 353                 gigaset_schedule_event(cs);
 354
 355                 break;
 356         case ISDN_CMD_CLREAZ: /* Do not signal incoming signals */
 357                 dev_info(cs->dev, "ignoring ISDN_CMD_CLREAZ\n");
 358                 break;
 359         case ISDN_CMD_SETEAZ: /* Signal incoming calls for given MSN */
 360                 dev_info(cs->dev, "ignoring ISDN_CMD_SETEAZ (%s)\n",
 361                          cntrl->parm.num);
 362                 break;
 363         case ISDN_CMD_SETL2: /* Set L2 to given protocol */
 364                 if (ch >= cs->channels) {
 365                         dev_err(cs->dev,
 366                                 "ISDN_CMD_SETL2: invalid channel (%d)\n", ch);
 367                         return -EINVAL;
 368                 }
 369                 bcs = cs->bcs + ch;
 370                 if (bcs->chstate & CHS_D_UP) {
 371                         dev_err(cs->dev,
 372                                 "ISDN_CMD_SETL2: channel active (%d)\n", ch);
 373                         return -EINVAL;
 374                 }
 375                 switch (cntrl->arg >> 8) {
 376                 case ISDN_PROTO_L2_HDLC:
 377                         gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL2: setting L2_HDLC");
 378                         bcs->proto2 = L2_HDLC;
 379                         break;
 380                 case ISDN_PROTO_L2_TRANS:
 381                         gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL2: setting L2_VOICE");
 382                         bcs->proto2 = L2_VOICE;
 383                         break;
 384                 default:
 385                         dev_err(cs->dev,
 386                                 "ISDN_CMD_SETL2: unsupported protocol (%lu)\n",
 387                                 cntrl->arg >> 8);
 388                         return -EINVAL;
 389                 }
 390                 break;
 391         case ISDN_CMD_SETL3: /* Set L3 to given protocol */
 392                 gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL3");
 393                 if (ch >= cs->channels) {
 394                         dev_err(cs->dev,
 395                                 "ISDN_CMD_SETL3: invalid channel (%d)\n", ch);
 396                         return -EINVAL;
 397                 }
 398
 399                 if (cntrl->arg >> 8 != ISDN_PROTO_L3_TRANS) {
 400                         dev_err(cs->dev,
 401                                 "ISDN_CMD_SETL3: unsupported protocol (%lu)\n",
 402                                 cntrl->arg >> 8);
 403                         return -EINVAL;
 404                 }
 405
 406                 break;
 407
 408         default:
 409                 gig_dbg(DEBUG_CMD, "unknown command %d from LL",
 410                         cntrl->command);
 411                 return -EINVAL;
 412         }
 413
 414         return retval;
 415
 416 oom:
 417         dev_err(bcs->cs->dev, "out of memory\n");
 418         for (i = 0; i < AT_NUM; ++i)
 419                 kfree(commands[i]);
 420         kfree(commands);
 421         gigaset_free_channel(bcs);
 422         return -ENOMEM;
 423 }
 424
 425 static void gigaset_i4l_cmd(struct cardstate *cs, int cmd)
 426 {
 427         isdn_if *iif = cs->iif;
 428         isdn_ctrl command;
 429
 430         command.driver = cs->myid;
 431         command.command = cmd;
 432         command.arg = 0;
 433         iif->statcallb(&command);
 434 }
 435
 436 static void gigaset_i4l_channel_cmd(struct bc_state *bcs, int cmd)
 437 {
 438         isdn_if *iif = bcs->cs->iif;
 439         isdn_ctrl command;
 440
 441         command.driver = bcs->cs->myid;
 442         command.command = cmd;
 443         command.arg = bcs->channel;
 444         iif->statcallb(&command);
 445 }
 446
 447 /**
 448  * gigaset_isdn_icall() - signal incoming call
 449  * @at_state:   connection state structure.
 450  *
 451  * Called by main module to notify the LL that an incoming call has been
 452  * received. @at_state contains the parameters of the call.
 453  *
 454  * Return value: call disposition (ICALL_*)
 455  */
 456 int gigaset_isdn_icall(struct at_state_t *at_state)
 457 {
 458         struct cardstate *cs = at_state->cs;
 459         struct bc_state *bcs = at_state->bcs;
 460         isdn_if *iif = cs->iif;
 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;
 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                 strlcpy(response.parm.setup.phone, at_state->str_var[STR_NMBR],
 489                         sizeof response.parm.setup.phone);
 490         } else
 491                 response.parm.setup.phone[0] = 0;
 492         if (at_state->str_var[STR_ZCPN]) {
 493                 strlcpy(response.parm.setup.eazmsn, at_state->str_var[STR_ZCPN],
 494                         sizeof response.parm.setup.eazmsn);
 495         } else
 496                 response.parm.setup.eazmsn[0] = 0;
 497
 498         if (!bcs) {
 499                 dev_notice(cs->dev, "no channel for incoming call\n");
 500                 response.command = ISDN_STAT_ICALLW;
 501                 response.arg = 0;
 502         } else {
 503                 gig_dbg(DEBUG_CMD, "Sending ICALL");
 504                 response.command = ISDN_STAT_ICALL;
 505                 response.arg = bcs->channel;
 506         }
 507         response.driver = cs->myid;
 508         retval = iif->statcallb(&response);
 509         gig_dbg(DEBUG_CMD, "Response: %d", retval);
 510         switch (retval) {
 511         case 0: /* no takers */
 512                 return ICALL_IGNORE;
 513         case 1: /* alerting */
 514                 bcs->chstate |= CHS_NOTIFY_LL;
 515                 return ICALL_ACCEPT;
 516         case 2: /* reject */
 517                 return ICALL_REJECT;
 518         case 3: /* incomplete */
 519                 dev_warn(cs->dev,
 520                        "LL requested unsupported feature: Incomplete Number\n");
 521                 return ICALL_IGNORE;
 522         case 4: /* proceeding */
 523                 /* Gigaset will send ALERTING anyway.
 524                  * There doesn't seem to be a way to avoid this.
 525                  */
 526                 return ICALL_ACCEPT;
 527         case 5: /* deflect */
 528                 dev_warn(cs->dev,
 529                          "LL requested unsupported feature: Call Deflection\n");
 530                 return ICALL_IGNORE;
 531         default:
 532                 dev_err(cs->dev, "LL error %d on ICALL\n", retval);
 533                 return ICALL_IGNORE;
 534         }
 535 }
 536
 537 /**
 538  * gigaset_isdn_connD() - signal D channel connect
 539  * @bcs:        B channel descriptor structure.
 540  *
 541  * Called by main module to notify the LL that the D channel connection has
 542  * been established.
 543  */
 544 void gigaset_isdn_connD(struct bc_state *bcs)
 545 {
 546         gig_dbg(DEBUG_CMD, "sending DCONN");
 547         gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DCONN);
 548 }
 549
 550 /**
 551  * gigaset_isdn_hupD() - signal D channel hangup
 552  * @bcs:        B channel descriptor structure.
 553  *
 554  * Called by main module to notify the LL that the D channel connection has
 555  * been shut down.
 556  */
 557 void gigaset_isdn_hupD(struct bc_state *bcs)
 558 {
 559         gig_dbg(DEBUG_CMD, "sending DHUP");
 560         gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DHUP);
 561 }
 562
 563 /**
 564  * gigaset_isdn_connB() - signal B channel connect
 565  * @bcs:        B channel descriptor structure.
 566  *
 567  * Called by main module to notify the LL that the B channel connection has
 568  * been established.
 569  */
 570 void gigaset_isdn_connB(struct bc_state *bcs)
 571 {
 572         gig_dbg(DEBUG_CMD, "sending BCONN");
 573         gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BCONN);
 574 }
 575
 576 /**
 577  * gigaset_isdn_hupB() - signal B channel hangup
 578  * @bcs:        B channel descriptor structure.
 579  *
 580  * Called by main module to notify the LL that the B channel connection has
 581  * been shut down.
 582  */
 583 void gigaset_isdn_hupB(struct bc_state *bcs)
 584 {
 585         gig_dbg(DEBUG_CMD, "sending BHUP");
 586         gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BHUP);
 587 }
 588
 589 /**
 590  * gigaset_isdn_start() - signal device availability
 591  * @cs:         device descriptor structure.
 592  *
 593  * Called by main module to notify the LL that the device is available for
 594  * use.
 595  */
 596 void gigaset_isdn_start(struct cardstate *cs)
 597 {
 598         gig_dbg(DEBUG_CMD, "sending RUN");
 599         gigaset_i4l_cmd(cs, ISDN_STAT_RUN);
 600 }
 601
 602 /**
 603  * gigaset_isdn_stop() - signal device unavailability
 604  * @cs:         device descriptor structure.
 605  *
 606  * Called by main module to notify the LL that the device is no longer
 607  * available for use.
 608  */
 609 void gigaset_isdn_stop(struct cardstate *cs)
 610 {
 611         gig_dbg(DEBUG_CMD, "sending STOP");
 612         gigaset_i4l_cmd(cs, ISDN_STAT_STOP);
 613 }
 614
 615 /**
 616  * gigaset_isdn_regdev() - register to LL
 617  * @cs:         device descriptor structure.
 618  * @isdnid:     device name.
 619  *
 620  * Return value: 1 for success, 0 for failure
 621  */
 622 int gigaset_isdn_regdev(struct cardstate *cs, const char *isdnid)
 623 {
 624         isdn_if *iif;
 625
 626         pr_info("ISDN4Linux interface\n");
 627
 628         iif = kmalloc(sizeof *iif, GFP_KERNEL);
 629         if (!iif) {
 630                 pr_err("out of memory\n");
 631                 return 0;
 632         }
 633
 634         if (snprintf(iif->id, sizeof iif->id, "%s_%u", isdnid, cs->minor_index)
 635             >= sizeof iif->id) {
 636                 pr_err("ID too long: %s\n", isdnid);
 637                 kfree(iif);
 638                 return 0;
 639         }
 640
 641         iif->owner = THIS_MODULE;
 642         iif->channels = cs->channels;
 643         iif->maxbufsize = MAX_BUF_SIZE;
 644         iif->features = ISDN_FEATURE_L2_TRANS |
 645                 ISDN_FEATURE_L2_HDLC |
 646                 ISDN_FEATURE_L2_X75I |
 647                 ISDN_FEATURE_L3_TRANS |
 648                 ISDN_FEATURE_P_EURO;
 649         iif->hl_hdrlen = HW_HDR_LEN;            /* Area for storing ack */
 650         iif->command = command_from_LL;
 651         iif->writebuf_skb = writebuf_from_LL;
 652         iif->writecmd = NULL;                   /* Don't support isdnctrl */
 653         iif->readstat = NULL;                   /* Don't support isdnctrl */
 654         iif->rcvcallb_skb = NULL;               /* Will be set by LL */
 655         iif->statcallb = NULL;                  /* Will be set by LL */
 656
 657         if (!register_isdn(iif)) {
 658                 pr_err("register_isdn failed\n");
 659                 kfree(iif);
 660                 return 0;
 661         }
 662
 663         cs->iif = iif;
 664         cs->myid = iif->channels;               /* Set my device id */
 665         cs->hw_hdr_len = HW_HDR_LEN;
 666         return 1;
 667 }
 668
 669 /**
 670  * gigaset_isdn_unregdev() - unregister device from LL
 671  * @cs:         device descriptor structure.
 672  */
 673 void gigaset_isdn_unregdev(struct cardstate *cs)
 674 {
 675         gig_dbg(DEBUG_CMD, "sending UNLOAD");
 676         gigaset_i4l_cmd(cs, ISDN_STAT_UNLOAD);
 677         kfree(cs->iif);
 678         cs->iif = NULL;
 679 }
 680
 681 /**
 682  * gigaset_isdn_regdrv() - register driver to LL
 683  */
 684 void gigaset_isdn_regdrv(void)
 685 {
 686         /* nothing to do */
 687 }
 688
 689 /**
 690  * gigaset_isdn_unregdrv() - unregister driver from LL
 691  */
 692 void gigaset_isdn_unregdrv(void)
 693 {
 694         /* nothing to do */
 695 }