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   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/ctype.h>
  18 #include <linux/module.h>
  19 #include <linux/moduleparam.h>
  20
  21 /* Version Information */
  22 #define DRIVER_AUTHOR "Hansjoerg Lipp <hjlipp@web.de>, Tilman Schmidt <tilman@imap.cc>, Stefan Eilers"
  23 #define DRIVER_DESC "Driver for Gigaset 307x"
  24
  25 /* Module parameters */
  26 int gigaset_debuglevel = DEBUG_DEFAULT;
  27 EXPORT_SYMBOL_GPL(gigaset_debuglevel);
  28 module_param_named(debug, gigaset_debuglevel, int, S_IRUGO|S_IWUSR);
  29 MODULE_PARM_DESC(debug, "debug level");
  30
  31 /* driver state flags */
  32 #define VALID_MINOR     0x01
  33 #define VALID_ID        0x02
  34
  35 void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
  36                         size_t len, const unsigned char *buf)
  37 {
  38         unsigned char outbuf[80];
  39         unsigned char c;
  40         size_t space = sizeof outbuf - 1;
  41         unsigned char *out = outbuf;
  42         size_t numin = len;
  43
  44         while (numin--) {
  45                 c = *buf++;
  46                 if (c == '~' || c == '^' || c == '\\') {
  47                         if (!space--)
  48                                 break;
  49                         *out++ = '\\';
  50                 }
  51                 if (c & 0x80) {
  52                         if (!space--)
  53                                 break;
  54                         *out++ = '~';
  55                         c ^= 0x80;
  56                 }
  57                 if (c < 0x20 || c == 0x7f) {
  58                         if (!space--)
  59                                 break;
  60                         *out++ = '^';
  61                         c ^= 0x40;
  62                 }
  63                 if (!space--)
  64                         break;
  65                 *out++ = c;
  66         }
  67         *out = 0;
  68
  69         gig_dbg(level, "%s (%u bytes): %s", msg, (unsigned) len, outbuf);
  70 }
  71 EXPORT_SYMBOL_GPL(gigaset_dbg_buffer);
  72
  73 static int setflags(struct cardstate *cs, unsigned flags, unsigned delay)
  74 {
  75         int r;
  76
  77         r = cs->ops->set_modem_ctrl(cs, cs->control_state, flags);
  78         cs->control_state = flags;
  79         if (r < 0)
  80                 return r;
  81
  82         if (delay) {
  83                 set_current_state(TASK_INTERRUPTIBLE);
  84                 schedule_timeout(delay * HZ / 1000);
  85         }
  86
  87         return 0;
  88 }
  89
  90 int gigaset_enterconfigmode(struct cardstate *cs)
  91 {
  92         int i, r;
  93
  94         cs->control_state = TIOCM_RTS; //FIXME
  95
  96         r = setflags(cs, TIOCM_DTR, 200);
  97         if (r < 0)
  98                 goto error;
  99         r = setflags(cs, 0, 200);
 100         if (r < 0)
 101                 goto error;
 102         for (i = 0; i < 5; ++i) {
 103                 r = setflags(cs, TIOCM_RTS, 100);
 104                 if (r < 0)
 105                         goto error;
 106                 r = setflags(cs, 0, 100);
 107                 if (r < 0)
 108                         goto error;
 109         }
 110         r = setflags(cs, TIOCM_RTS|TIOCM_DTR, 800);
 111         if (r < 0)
 112                 goto error;
 113
 114         return 0;
 115
 116 error:
 117         dev_err(cs->dev, "error %d on setuartbits\n", -r);
 118         cs->control_state = TIOCM_RTS|TIOCM_DTR; // FIXME is this a good value?
 119         cs->ops->set_modem_ctrl(cs, 0, TIOCM_RTS|TIOCM_DTR);
 120
 121         return -1; //r
 122 }
 123
 124 static int test_timeout(struct at_state_t *at_state)
 125 {
 126         if (!at_state->timer_expires)
 127                 return 0;
 128
 129         if (--at_state->timer_expires) {
 130                 gig_dbg(DEBUG_MCMD, "decreased timer of %p to %lu",
 131                         at_state, at_state->timer_expires);
 132                 return 0;
 133         }
 134
 135         if (!gigaset_add_event(at_state->cs, at_state, EV_TIMEOUT, NULL,
 136                                at_state->timer_index, NULL)) {
 137                 //FIXME what should we do?
 138         }
 139
 140         return 1;
 141 }
 142
 143 static void timer_tick(unsigned long data)
 144 {
 145         struct cardstate *cs = (struct cardstate *) data;
 146         unsigned long flags;
 147         unsigned channel;
 148         struct at_state_t *at_state;
 149         int timeout = 0;
 150
 151         spin_lock_irqsave(&cs->lock, flags);
 152
 153         for (channel = 0; channel < cs->channels; ++channel)
 154                 if (test_timeout(&cs->bcs[channel].at_state))
 155                         timeout = 1;
 156
 157         if (test_timeout(&cs->at_state))
 158                 timeout = 1;
 159
 160         list_for_each_entry(at_state, &cs->temp_at_states, list)
 161                 if (test_timeout(at_state))
 162                         timeout = 1;
 163
 164         if (cs->running) {
 165                 mod_timer(&cs->timer, jiffies + msecs_to_jiffies(GIG_TICK));
 166                 if (timeout) {
 167                         gig_dbg(DEBUG_CMD, "scheduling timeout");
 168                         tasklet_schedule(&cs->event_tasklet);
 169                 }
 170         }
 171
 172         spin_unlock_irqrestore(&cs->lock, flags);
 173 }
 174
 175 int gigaset_get_channel(struct bc_state *bcs)
 176 {
 177         unsigned long flags;
 178
 179         spin_lock_irqsave(&bcs->cs->lock, flags);
 180         if (bcs->use_count || !try_module_get(bcs->cs->driver->owner)) {
 181                 gig_dbg(DEBUG_ANY, "could not allocate channel %d",
 182                         bcs->channel);
 183                 spin_unlock_irqrestore(&bcs->cs->lock, flags);
 184                 return 0;
 185         }
 186         ++bcs->use_count;
 187         bcs->busy = 1;
 188         gig_dbg(DEBUG_ANY, "allocated channel %d", bcs->channel);
 189         spin_unlock_irqrestore(&bcs->cs->lock, flags);
 190         return 1;
 191 }
 192
 193 void gigaset_free_channel(struct bc_state *bcs)
 194 {
 195         unsigned long flags;
 196
 197         spin_lock_irqsave(&bcs->cs->lock, flags);
 198         if (!bcs->busy) {
 199                 gig_dbg(DEBUG_ANY, "could not free channel %d", bcs->channel);
 200                 spin_unlock_irqrestore(&bcs->cs->lock, flags);
 201                 return;
 202         }
 203         --bcs->use_count;
 204         bcs->busy = 0;
 205         module_put(bcs->cs->driver->owner);
 206         gig_dbg(DEBUG_ANY, "freed channel %d", bcs->channel);
 207         spin_unlock_irqrestore(&bcs->cs->lock, flags);
 208 }
 209
 210 int gigaset_get_channels(struct cardstate *cs)
 211 {
 212         unsigned long flags;
 213         int i;
 214
 215         spin_lock_irqsave(&cs->lock, flags);
 216         for (i = 0; i < cs->channels; ++i)
 217                 if (cs->bcs[i].use_count) {
 218                         spin_unlock_irqrestore(&cs->lock, flags);
 219                         gig_dbg(DEBUG_ANY, "could not allocate all channels");
 220                         return 0;
 221                 }
 222         for (i = 0; i < cs->channels; ++i)
 223                 ++cs->bcs[i].use_count;
 224         spin_unlock_irqrestore(&cs->lock, flags);
 225
 226         gig_dbg(DEBUG_ANY, "allocated all channels");
 227
 228         return 1;
 229 }
 230
 231 void gigaset_free_channels(struct cardstate *cs)
 232 {
 233         unsigned long flags;
 234         int i;
 235
 236         gig_dbg(DEBUG_ANY, "unblocking all channels");
 237         spin_lock_irqsave(&cs->lock, flags);
 238         for (i = 0; i < cs->channels; ++i)
 239                 --cs->bcs[i].use_count;
 240         spin_unlock_irqrestore(&cs->lock, flags);
 241 }
 242
 243 void gigaset_block_channels(struct cardstate *cs)
 244 {
 245         unsigned long flags;
 246         int i;
 247
 248         gig_dbg(DEBUG_ANY, "blocking all channels");
 249         spin_lock_irqsave(&cs->lock, flags);
 250         for (i = 0; i < cs->channels; ++i)
 251                 ++cs->bcs[i].use_count;
 252         spin_unlock_irqrestore(&cs->lock, flags);
 253 }
 254
 255 static void clear_events(struct cardstate *cs)
 256 {
 257         struct event_t *ev;
 258         unsigned head, tail;
 259         unsigned long flags;
 260
 261         spin_lock_irqsave(&cs->ev_lock, flags);
 262
 263         head = cs->ev_head;
 264         tail = cs->ev_tail;
 265
 266         while (tail != head) {
 267                 ev = cs->events + head;
 268                 kfree(ev->ptr);
 269                 head = (head + 1) % MAX_EVENTS;
 270         }
 271
 272         cs->ev_head = tail;
 273
 274         spin_unlock_irqrestore(&cs->ev_lock, flags);
 275 }
 276
 277 struct event_t *gigaset_add_event(struct cardstate *cs,
 278                                   struct at_state_t *at_state, int type,
 279                                   void *ptr, int parameter, void *arg)
 280 {
 281         unsigned long flags;
 282         unsigned next, tail;
 283         struct event_t *event = NULL;
 284
 285         spin_lock_irqsave(&cs->ev_lock, flags);
 286
 287         tail = cs->ev_tail;
 288         next = (tail + 1) % MAX_EVENTS;
 289         if (unlikely(next == cs->ev_head))
 290                 dev_err(cs->dev, "event queue full\n");
 291         else {
 292                 event = cs->events + tail;
 293                 event->type = type;
 294                 event->at_state = at_state;
 295                 event->cid = -1;
 296                 event->ptr = ptr;
 297                 event->arg = arg;
 298                 event->parameter = parameter;
 299                 cs->ev_tail = next;
 300         }
 301
 302         spin_unlock_irqrestore(&cs->ev_lock, flags);
 303
 304         return event;
 305 }
 306 EXPORT_SYMBOL_GPL(gigaset_add_event);
 307
 308 static void free_strings(struct at_state_t *at_state)
 309 {
 310         int i;
 311
 312         for (i = 0; i < STR_NUM; ++i) {
 313                 kfree(at_state->str_var[i]);
 314                 at_state->str_var[i] = NULL;
 315         }
 316 }
 317
 318 static void clear_at_state(struct at_state_t *at_state)
 319 {
 320         free_strings(at_state);
 321 }
 322
 323 static void dealloc_at_states(struct cardstate *cs)
 324 {
 325         struct at_state_t *cur, *next;
 326
 327         list_for_each_entry_safe(cur, next, &cs->temp_at_states, list) {
 328                 list_del(&cur->list);
 329                 free_strings(cur);
 330                 kfree(cur);
 331         }
 332 }
 333
 334 static void gigaset_freebcs(struct bc_state *bcs)
 335 {
 336         int i;
 337
 338         gig_dbg(DEBUG_INIT, "freeing bcs[%d]->hw", bcs->channel);
 339         if (!bcs->cs->ops->freebcshw(bcs)) {
 340                 gig_dbg(DEBUG_INIT, "failed");
 341         }
 342
 343         gig_dbg(DEBUG_INIT, "clearing bcs[%d]->at_state", bcs->channel);
 344         clear_at_state(&bcs->at_state);
 345         gig_dbg(DEBUG_INIT, "freeing bcs[%d]->skb", bcs->channel);
 346
 347         if (bcs->skb)
 348                 dev_kfree_skb(bcs->skb);
 349         for (i = 0; i < AT_NUM; ++i) {
 350                 kfree(bcs->commands[i]);
 351                 bcs->commands[i] = NULL;
 352         }
 353 }
 354
 355 static struct cardstate *alloc_cs(struct gigaset_driver *drv)
 356 {
 357         unsigned long flags;
 358         unsigned i;
 359         struct cardstate *cs;
 360         struct cardstate *ret = NULL;
 361
 362         spin_lock_irqsave(&drv->lock, flags);
 363         if (drv->blocked)
 364                 goto exit;
 365         for (i = 0; i < drv->minors; ++i) {
 366                 cs = drv->cs + i;
 367                 if (!(cs->flags & VALID_MINOR)) {
 368                         cs->flags = VALID_MINOR;
 369                         ret = cs;
 370                         break;
 371                 }
 372         }
 373 exit:
 374         spin_unlock_irqrestore(&drv->lock, flags);
 375         return ret;
 376 }
 377
 378 static void free_cs(struct cardstate *cs)
 379 {
 380         cs->flags = 0;
 381 }
 382
 383 static void make_valid(struct cardstate *cs, unsigned mask)
 384 {
 385         unsigned long flags;
 386         struct gigaset_driver *drv = cs->driver;
 387         spin_lock_irqsave(&drv->lock, flags);
 388         cs->flags |= mask;
 389         spin_unlock_irqrestore(&drv->lock, flags);
 390 }
 391
 392 static void make_invalid(struct cardstate *cs, unsigned mask)
 393 {
 394         unsigned long flags;
 395         struct gigaset_driver *drv = cs->driver;
 396         spin_lock_irqsave(&drv->lock, flags);
 397         cs->flags &= ~mask;
 398         spin_unlock_irqrestore(&drv->lock, flags);
 399 }
 400
 401 void gigaset_freecs(struct cardstate *cs)
 402 {
 403         int i;
 404         unsigned long flags;
 405
 406         if (!cs)
 407                 return;
 408
 409         mutex_lock(&cs->mutex);
 410
 411         if (!cs->bcs)
 412                 goto f_cs;
 413         if (!cs->inbuf)
 414                 goto f_bcs;
 415
 416         spin_lock_irqsave(&cs->lock, flags);
 417         cs->running = 0;
 418         spin_unlock_irqrestore(&cs->lock, flags); /* event handler and timer are
 419                                                      not rescheduled below */
 420
 421         tasklet_kill(&cs->event_tasklet);
 422         del_timer_sync(&cs->timer);
 423
 424         switch (cs->cs_init) {
 425         default:
 426                 /* clear device sysfs */
 427                 gigaset_free_dev_sysfs(cs);
 428
 429                 gigaset_if_free(cs);
 430
 431                 gig_dbg(DEBUG_INIT, "clearing hw");
 432                 cs->ops->freecshw(cs);
 433
 434                 //FIXME cmdbuf
 435
 436                 /* fall through */
 437         case 2: /* error in initcshw */
 438                 /* Deregister from LL */
 439                 make_invalid(cs, VALID_ID);
 440                 gig_dbg(DEBUG_INIT, "clearing iif");
 441                 gigaset_i4l_cmd(cs, ISDN_STAT_UNLOAD);
 442
 443                 /* fall through */
 444         case 1: /* error when regestering to LL */
 445                 gig_dbg(DEBUG_INIT, "clearing at_state");
 446                 clear_at_state(&cs->at_state);
 447                 dealloc_at_states(cs);
 448
 449                 /* fall through */
 450         case 0: /* error in one call to initbcs */
 451                 for (i = 0; i < cs->channels; ++i) {
 452                         gig_dbg(DEBUG_INIT, "clearing bcs[%d]", i);
 453                         gigaset_freebcs(cs->bcs + i);
 454                 }
 455
 456                 clear_events(cs);
 457                 gig_dbg(DEBUG_INIT, "freeing inbuf");
 458                 kfree(cs->inbuf);
 459         }
 460 f_bcs:  gig_dbg(DEBUG_INIT, "freeing bcs[]");
 461         kfree(cs->bcs);
 462 f_cs:   gig_dbg(DEBUG_INIT, "freeing cs");
 463         mutex_unlock(&cs->mutex);
 464         free_cs(cs);
 465 }
 466 EXPORT_SYMBOL_GPL(gigaset_freecs);
 467
 468 void gigaset_at_init(struct at_state_t *at_state, struct bc_state *bcs,
 469                      struct cardstate *cs, int cid)
 470 {
 471         int i;
 472
 473         INIT_LIST_HEAD(&at_state->list);
 474         at_state->waiting = 0;
 475         at_state->getstring = 0;
 476         at_state->pending_commands = 0;
 477         at_state->timer_expires = 0;
 478         at_state->timer_active = 0;
 479         at_state->timer_index = 0;
 480         at_state->seq_index = 0;
 481         at_state->ConState = 0;
 482         for (i = 0; i < STR_NUM; ++i)
 483                 at_state->str_var[i] = NULL;
 484         at_state->int_var[VAR_ZDLE] = 0;
 485         at_state->int_var[VAR_ZCTP] = -1;
 486         at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
 487         at_state->cs = cs;
 488         at_state->bcs = bcs;
 489         at_state->cid = cid;
 490         if (!cid)
 491                 at_state->replystruct = cs->tabnocid;
 492         else
 493                 at_state->replystruct = cs->tabcid;
 494 }
 495
 496
 497 static void gigaset_inbuf_init(struct inbuf_t *inbuf, struct bc_state *bcs,
 498                                struct cardstate *cs, int inputstate)
 499 /* inbuf->read must be allocated before! */
 500 {
 501         inbuf->head = 0;
 502         inbuf->tail = 0;
 503         inbuf->cs = cs;
 504         inbuf->bcs = bcs; /*base driver: NULL*/
 505         inbuf->rcvbuf = NULL;
 506         inbuf->inputstate = inputstate;
 507 }
 508
 509 /* append received bytes to inbuf */
 510 int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src,
 511                        unsigned numbytes)
 512 {
 513         unsigned n, head, tail, bytesleft;
 514
 515         gig_dbg(DEBUG_INTR, "received %u bytes", numbytes);
 516
 517         if (!numbytes)
 518                 return 0;
 519
 520         bytesleft = numbytes;
 521         tail = inbuf->tail;
 522         head = inbuf->head;
 523         gig_dbg(DEBUG_INTR, "buffer state: %u -> %u", head, tail);
 524
 525         while (bytesleft) {
 526                 if (head > tail)
 527                         n = head - 1 - tail;
 528                 else if (head == 0)
 529                         n = (RBUFSIZE-1) - tail;
 530                 else
 531                         n = RBUFSIZE - tail;
 532                 if (!n) {
 533                         dev_err(inbuf->cs->dev,
 534                                 "buffer overflow (%u bytes lost)\n",
 535                                 bytesleft);
 536                         break;
 537                 }
 538                 if (n > bytesleft)
 539                         n = bytesleft;
 540                 memcpy(inbuf->data + tail, src, n);
 541                 bytesleft -= n;
 542                 tail = (tail + n) % RBUFSIZE;
 543                 src += n;
 544         }
 545         gig_dbg(DEBUG_INTR, "setting tail to %u", tail);
 546         inbuf->tail = tail;
 547         return numbytes != bytesleft;
 548 }
 549 EXPORT_SYMBOL_GPL(gigaset_fill_inbuf);
 550
 551 /* Initialize the b-channel structure */
 552 static struct bc_state *gigaset_initbcs(struct bc_state *bcs,
 553                                         struct cardstate *cs, int channel)
 554 {
 555         int i;
 556
 557         bcs->tx_skb = NULL; //FIXME -> hw part
 558
 559         skb_queue_head_init(&bcs->squeue);
 560
 561         bcs->corrupted = 0;
 562         bcs->trans_down = 0;
 563         bcs->trans_up = 0;
 564
 565         gig_dbg(DEBUG_INIT, "setting up bcs[%d]->at_state", channel);
 566         gigaset_at_init(&bcs->at_state, bcs, cs, -1);
 567
 568         bcs->rcvbytes = 0;
 569
 570 #ifdef CONFIG_GIGASET_DEBUG
 571         bcs->emptycount = 0;
 572 #endif
 573
 574         gig_dbg(DEBUG_INIT, "allocating bcs[%d]->skb", channel);
 575         bcs->fcs = PPP_INITFCS;
 576         bcs->inputstate = 0;
 577         if (cs->ignoreframes) {
 578                 bcs->inputstate |= INS_skip_frame;
 579                 bcs->skb = NULL;
 580         } else if ((bcs->skb = dev_alloc_skb(SBUFSIZE + HW_HDR_LEN)) != NULL)
 581                 skb_reserve(bcs->skb, HW_HDR_LEN);
 582         else {
 583                 pr_err("out of memory\n");
 584                 bcs->inputstate |= INS_skip_frame;
 585         }
 586
 587         bcs->channel = channel;
 588         bcs->cs = cs;
 589
 590         bcs->chstate = 0;
 591         bcs->use_count = 1;
 592         bcs->busy = 0;
 593         bcs->ignore = cs->ignoreframes;
 594
 595         for (i = 0; i < AT_NUM; ++i)
 596                 bcs->commands[i] = NULL;
 597
 598         gig_dbg(DEBUG_INIT, "  setting up bcs[%d]->hw", channel);
 599         if (cs->ops->initbcshw(bcs))
 600                 return bcs;
 601
 602         gig_dbg(DEBUG_INIT, "  failed");
 603
 604         gig_dbg(DEBUG_INIT, "  freeing bcs[%d]->skb", channel);
 605         if (bcs->skb)
 606                 dev_kfree_skb(bcs->skb);
 607
 608         return NULL;
 609 }
 610
 611 /* gigaset_initcs
 612  * Allocate and initialize cardstate structure for Gigaset driver
 613  * Calls hardware dependent gigaset_initcshw() function
 614  * Calls B channel initialization function gigaset_initbcs() for each B channel
 615  * parameters:
 616  *      drv             hardware driver the device belongs to
 617  *      channels        number of B channels supported by device
 618  *      onechannel      !=0: B channel data and AT commands share one
 619  *                           communication channel
 620  *                      ==0: B channels have separate communication channels
 621  *      ignoreframes    number of frames to ignore after setting up B channel
 622  *      cidmode         !=0: start in CallID mode
 623  *      modulename      name of driver module (used for I4L registration)
 624  * return value:
 625  *      pointer to cardstate structure
 626  */
 627 struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels,
 628                                  int onechannel, int ignoreframes,
 629                                  int cidmode, const char *modulename)
 630 {
 631         struct cardstate *cs = NULL;
 632         unsigned long flags;
 633         int i;
 634
 635         gig_dbg(DEBUG_INIT, "allocating cs");
 636         if (!(cs = alloc_cs(drv))) {
 637                 pr_err("maximum number of devices exceeded\n");
 638                 return NULL;
 639         }
 640
 641         gig_dbg(DEBUG_INIT, "allocating bcs[0..%d]", channels - 1);
 642         cs->bcs = kmalloc(channels * sizeof(struct bc_state), GFP_KERNEL);
 643         if (!cs->bcs) {
 644                 pr_err("out of memory\n");
 645                 goto error;
 646         }
 647         gig_dbg(DEBUG_INIT, "allocating inbuf");
 648         cs->inbuf = kmalloc(sizeof(struct inbuf_t), GFP_KERNEL);
 649         if (!cs->inbuf) {
 650                 pr_err("out of memory\n");
 651                 goto error;
 652         }
 653
 654         cs->cs_init = 0;
 655         cs->channels = channels;
 656         cs->onechannel = onechannel;
 657         cs->ignoreframes = ignoreframes;
 658         INIT_LIST_HEAD(&cs->temp_at_states);
 659         cs->running = 0;
 660         init_timer(&cs->timer); /* clear next & prev */
 661         spin_lock_init(&cs->ev_lock);
 662         cs->ev_tail = 0;
 663         cs->ev_head = 0;
 664
 665         tasklet_init(&cs->event_tasklet, &gigaset_handle_event,
 666                      (unsigned long) cs);
 667         cs->commands_pending = 0;
 668         cs->cur_at_seq = 0;
 669         cs->gotfwver = -1;
 670         cs->open_count = 0;
 671         cs->dev = NULL;
 672         cs->tty = NULL;
 673         cs->tty_dev = NULL;
 674         cs->cidmode = cidmode != 0;
 675
 676         //if(onechannel) { //FIXME
 677                 cs->tabnocid = gigaset_tab_nocid_m10x;
 678                 cs->tabcid = gigaset_tab_cid_m10x;
 679         //} else {
 680         //      cs->tabnocid = gigaset_tab_nocid;
 681         //      cs->tabcid = gigaset_tab_cid;
 682         //}
 683
 684         init_waitqueue_head(&cs->waitqueue);
 685         cs->waiting = 0;
 686
 687         cs->mode = M_UNKNOWN;
 688         cs->mstate = MS_UNINITIALIZED;
 689
 690         for (i = 0; i < channels; ++i) {
 691                 gig_dbg(DEBUG_INIT, "setting up bcs[%d].read", i);
 692                 if (!gigaset_initbcs(cs->bcs + i, cs, i)) {
 693                         pr_err("could not allocate channel %d data\n", i);
 694                         goto error;
 695                 }
 696         }
 697
 698         ++cs->cs_init;
 699
 700         gig_dbg(DEBUG_INIT, "setting up at_state");
 701         spin_lock_init(&cs->lock);
 702         gigaset_at_init(&cs->at_state, NULL, cs, 0);
 703         cs->dle = 0;
 704         cs->cbytes = 0;
 705
 706         gig_dbg(DEBUG_INIT, "setting up inbuf");
 707         if (onechannel) {                       //FIXME distinction necessary?
 708                 gigaset_inbuf_init(cs->inbuf, cs->bcs, cs, INS_command);
 709         } else
 710                 gigaset_inbuf_init(cs->inbuf, NULL,    cs, INS_command);
 711
 712         cs->connected = 0;
 713         cs->isdn_up = 0;
 714
 715         gig_dbg(DEBUG_INIT, "setting up cmdbuf");
 716         cs->cmdbuf = cs->lastcmdbuf = NULL;
 717         spin_lock_init(&cs->cmdlock);
 718         cs->curlen = 0;
 719         cs->cmdbytes = 0;
 720
 721         gig_dbg(DEBUG_INIT, "setting up iif");
 722         if (!gigaset_register_to_LL(cs, modulename)) {
 723                 pr_err("error registering ISDN device\n");
 724                 goto error;
 725         }
 726
 727         make_valid(cs, VALID_ID);
 728         ++cs->cs_init;
 729         gig_dbg(DEBUG_INIT, "setting up hw");
 730         if (!cs->ops->initcshw(cs))
 731                 goto error;
 732
 733         ++cs->cs_init;
 734
 735         /* set up character device */
 736         gigaset_if_init(cs);
 737
 738         /* set up device sysfs */
 739         gigaset_init_dev_sysfs(cs);
 740
 741         spin_lock_irqsave(&cs->lock, flags);
 742         cs->running = 1;
 743         spin_unlock_irqrestore(&cs->lock, flags);
 744         setup_timer(&cs->timer, timer_tick, (unsigned long) cs);
 745         cs->timer.expires = jiffies + msecs_to_jiffies(GIG_TICK);
 746         /* FIXME: can jiffies increase too much until the timer is added?
 747          * Same problem(?) with mod_timer() in timer_tick(). */
 748         add_timer(&cs->timer);
 749
 750         gig_dbg(DEBUG_INIT, "cs initialized");
 751         return cs;
 752
 753 error:
 754         gig_dbg(DEBUG_INIT, "failed");
 755         gigaset_freecs(cs);
 756         return NULL;
 757 }
 758 EXPORT_SYMBOL_GPL(gigaset_initcs);
 759
 760 /* ReInitialize the b-channel structure on hangup */
 761 void gigaset_bcs_reinit(struct bc_state *bcs)
 762 {
 763         struct sk_buff *skb;
 764         struct cardstate *cs = bcs->cs;
 765         unsigned long flags;
 766
 767         while ((skb = skb_dequeue(&bcs->squeue)) != NULL)
 768                 dev_kfree_skb(skb);
 769
 770         spin_lock_irqsave(&cs->lock, flags);
 771         clear_at_state(&bcs->at_state);
 772         bcs->at_state.ConState = 0;
 773         bcs->at_state.timer_active = 0;
 774         bcs->at_state.timer_expires = 0;
 775         bcs->at_state.cid = -1;                 /* No CID defined */
 776         spin_unlock_irqrestore(&cs->lock, flags);
 777
 778         bcs->inputstate = 0;
 779
 780 #ifdef CONFIG_GIGASET_DEBUG
 781         bcs->emptycount = 0;
 782 #endif
 783
 784         bcs->fcs = PPP_INITFCS;
 785         bcs->chstate = 0;
 786
 787         bcs->ignore = cs->ignoreframes;
 788         if (bcs->ignore)
 789                 bcs->inputstate |= INS_skip_frame;
 790
 791
 792         cs->ops->reinitbcshw(bcs);
 793 }
 794
 795 static void cleanup_cs(struct cardstate *cs)
 796 {
 797         struct cmdbuf_t *cb, *tcb;
 798         int i;
 799         unsigned long flags;
 800
 801         spin_lock_irqsave(&cs->lock, flags);
 802
 803         cs->mode = M_UNKNOWN;
 804         cs->mstate = MS_UNINITIALIZED;
 805
 806         clear_at_state(&cs->at_state);
 807         dealloc_at_states(cs);
 808         free_strings(&cs->at_state);
 809         gigaset_at_init(&cs->at_state, NULL, cs, 0);
 810
 811         kfree(cs->inbuf->rcvbuf);
 812         cs->inbuf->rcvbuf = NULL;
 813         cs->inbuf->inputstate = INS_command;
 814         cs->inbuf->head = 0;
 815         cs->inbuf->tail = 0;
 816
 817         cb = cs->cmdbuf;
 818         while (cb) {
 819                 tcb = cb;
 820                 cb = cb->next;
 821                 kfree(tcb);
 822         }
 823         cs->cmdbuf = cs->lastcmdbuf = NULL;
 824         cs->curlen = 0;
 825         cs->cmdbytes = 0;
 826         cs->gotfwver = -1;
 827         cs->dle = 0;
 828         cs->cur_at_seq = 0;
 829         cs->commands_pending = 0;
 830         cs->cbytes = 0;
 831
 832         spin_unlock_irqrestore(&cs->lock, flags);
 833
 834         for (i = 0; i < cs->channels; ++i) {
 835                 gigaset_freebcs(cs->bcs + i);
 836                 if (!gigaset_initbcs(cs->bcs + i, cs, i))
 837                         pr_err("could not allocate channel %d data\n", i);
 838         }
 839
 840         if (cs->waiting) {
 841                 cs->cmd_result = -ENODEV;
 842                 cs->waiting = 0;
 843                 wake_up_interruptible(&cs->waitqueue);
 844         }
 845 }
 846
 847
 848 int gigaset_start(struct cardstate *cs)
 849 {
 850         unsigned long flags;
 851
 852         if (mutex_lock_interruptible(&cs->mutex))
 853                 return 0;
 854
 855         spin_lock_irqsave(&cs->lock, flags);
 856         cs->connected = 1;
 857         spin_unlock_irqrestore(&cs->lock, flags);
 858
 859         if (cs->mstate != MS_LOCKED) {
 860                 cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR|TIOCM_RTS);
 861                 cs->ops->baud_rate(cs, B115200);
 862                 cs->ops->set_line_ctrl(cs, CS8);
 863                 cs->control_state = TIOCM_DTR|TIOCM_RTS;
 864         } else {
 865                 //FIXME use some saved values?
 866         }
 867
 868         cs->waiting = 1;
 869
 870         if (!gigaset_add_event(cs, &cs->at_state, EV_START, NULL, 0, NULL)) {
 871                 cs->waiting = 0;
 872                 //FIXME what should we do?
 873                 goto error;
 874         }
 875
 876         gig_dbg(DEBUG_CMD, "scheduling START");
 877         gigaset_schedule_event(cs);
 878
 879         wait_event(cs->waitqueue, !cs->waiting);
 880
 881         mutex_unlock(&cs->mutex);
 882         return 1;
 883
 884 error:
 885         mutex_unlock(&cs->mutex);
 886         return 0;
 887 }
 888 EXPORT_SYMBOL_GPL(gigaset_start);
 889
 890 /* gigaset_shutdown
 891  * check if a device is associated to the cardstate structure and stop it
 892  * return value: 0 if ok, -1 if no device was associated
 893  */
 894 int gigaset_shutdown(struct cardstate *cs)
 895 {
 896         mutex_lock(&cs->mutex);
 897
 898         if (!(cs->flags & VALID_MINOR)) {
 899                 mutex_unlock(&cs->mutex);
 900                 return -1;
 901         }
 902
 903         cs->waiting = 1;
 904
 905         if (!gigaset_add_event(cs, &cs->at_state, EV_SHUTDOWN, NULL, 0, NULL)) {
 906                 //FIXME what should we do?
 907                 goto exit;
 908         }
 909
 910         gig_dbg(DEBUG_CMD, "scheduling SHUTDOWN");
 911         gigaset_schedule_event(cs);
 912
 913         wait_event(cs->waitqueue, !cs->waiting);
 914
 915         cleanup_cs(cs);
 916
 917 exit:
 918         mutex_unlock(&cs->mutex);
 919         return 0;
 920 }
 921 EXPORT_SYMBOL_GPL(gigaset_shutdown);
 922
 923 void gigaset_stop(struct cardstate *cs)
 924 {
 925         mutex_lock(&cs->mutex);
 926
 927         cs->waiting = 1;
 928
 929         if (!gigaset_add_event(cs, &cs->at_state, EV_STOP, NULL, 0, NULL)) {
 930                 //FIXME what should we do?
 931                 goto exit;
 932         }
 933
 934         gig_dbg(DEBUG_CMD, "scheduling STOP");
 935         gigaset_schedule_event(cs);
 936
 937         wait_event(cs->waitqueue, !cs->waiting);
 938
 939         cleanup_cs(cs);
 940
 941 exit:
 942         mutex_unlock(&cs->mutex);
 943 }
 944 EXPORT_SYMBOL_GPL(gigaset_stop);
 945
 946 static LIST_HEAD(drivers);
 947 static DEFINE_SPINLOCK(driver_lock);
 948
 949 struct cardstate *gigaset_get_cs_by_id(int id)
 950 {
 951         unsigned long flags;
 952         struct cardstate *ret = NULL;
 953         struct cardstate *cs;
 954         struct gigaset_driver *drv;
 955         unsigned i;
 956
 957         spin_lock_irqsave(&driver_lock, flags);
 958         list_for_each_entry(drv, &drivers, list) {
 959                 spin_lock(&drv->lock);
 960                 for (i = 0; i < drv->minors; ++i) {
 961                         cs = drv->cs + i;
 962                         if ((cs->flags & VALID_ID) && cs->myid == id) {
 963                                 ret = cs;
 964                                 break;
 965                         }
 966                 }
 967                 spin_unlock(&drv->lock);
 968                 if (ret)
 969                         break;
 970         }
 971         spin_unlock_irqrestore(&driver_lock, flags);
 972         return ret;
 973 }
 974
 975 void gigaset_debugdrivers(void)
 976 {
 977         unsigned long flags;
 978         static struct cardstate *cs;
 979         struct gigaset_driver *drv;
 980         unsigned i;
 981
 982         spin_lock_irqsave(&driver_lock, flags);
 983         list_for_each_entry(drv, &drivers, list) {
 984                 gig_dbg(DEBUG_DRIVER, "driver %p", drv);
 985                 spin_lock(&drv->lock);
 986                 for (i = 0; i < drv->minors; ++i) {
 987                         gig_dbg(DEBUG_DRIVER, "  index %u", i);
 988                         cs = drv->cs + i;
 989                         gig_dbg(DEBUG_DRIVER, "    cardstate %p", cs);
 990                         gig_dbg(DEBUG_DRIVER, "    flags 0x%02x", cs->flags);
 991                         gig_dbg(DEBUG_DRIVER, "    minor_index %u",
 992                                 cs->minor_index);
 993                         gig_dbg(DEBUG_DRIVER, "    driver %p", cs->driver);
 994                         gig_dbg(DEBUG_DRIVER, "    i4l id %d", cs->myid);
 995                 }
 996                 spin_unlock(&drv->lock);
 997         }
 998         spin_unlock_irqrestore(&driver_lock, flags);
 999 }
1000
1001 static struct cardstate *gigaset_get_cs_by_minor(unsigned minor)
1002 {
1003         unsigned long flags;
1004         struct cardstate *ret = NULL;
1005         struct gigaset_driver *drv;
1006         unsigned index;
1007
1008         spin_lock_irqsave(&driver_lock, flags);
1009         list_for_each_entry(drv, &drivers, list) {
1010                 if (minor < drv->minor || minor >= drv->minor + drv->minors)
1011                         continue;
1012                 index = minor - drv->minor;
1013                 spin_lock(&drv->lock);
1014                 if (drv->cs[index].flags & VALID_MINOR)
1015                         ret = drv->cs + index;
1016                 spin_unlock(&drv->lock);
1017                 if (ret)
1018                         break;
1019         }
1020         spin_unlock_irqrestore(&driver_lock, flags);
1021         return ret;
1022 }
1023
1024 struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty)
1025 {
1026         if (tty->index < 0 || tty->index >= tty->driver->num)
1027                 return NULL;
1028         return gigaset_get_cs_by_minor(tty->index + tty->driver->minor_start);
1029 }
1030
1031 void gigaset_freedriver(struct gigaset_driver *drv)
1032 {
1033         unsigned long flags;
1034
1035         spin_lock_irqsave(&driver_lock, flags);
1036         list_del(&drv->list);
1037         spin_unlock_irqrestore(&driver_lock, flags);
1038
1039         gigaset_if_freedriver(drv);
1040
1041         kfree(drv->cs);
1042         kfree(drv);
1043 }
1044 EXPORT_SYMBOL_GPL(gigaset_freedriver);
1045
1046 /* gigaset_initdriver
1047  * Allocate and initialize gigaset_driver structure. Initialize interface.
1048  * parameters:
1049  *      minor           First minor number
1050  *      minors          Number of minors this driver can handle
1051  *      procname        Name of the driver
1052  *      devname         Name of the device files (prefix without minor number)
1053  * return value:
1054  *      Pointer to the gigaset_driver structure on success, NULL on failure.
1055  */
1056 struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors,
1057                                           const char *procname,
1058                                           const char *devname,
1059                                           const struct gigaset_ops *ops,
1060                                           struct module *owner)
1061 {
1062         struct gigaset_driver *drv;
1063         unsigned long flags;
1064         unsigned i;
1065
1066         drv = kmalloc(sizeof *drv, GFP_KERNEL);
1067         if (!drv)
1068                 return NULL;
1069
1070         drv->have_tty = 0;
1071         drv->minor = minor;
1072         drv->minors = minors;
1073         spin_lock_init(&drv->lock);
1074         drv->blocked = 0;
1075         drv->ops = ops;
1076         drv->owner = owner;
1077         INIT_LIST_HEAD(&drv->list);
1078
1079         drv->cs = kmalloc(minors * sizeof *drv->cs, GFP_KERNEL);
1080         if (!drv->cs)
1081                 goto error;
1082
1083         for (i = 0; i < minors; ++i) {
1084                 drv->cs[i].flags = 0;
1085                 drv->cs[i].driver = drv;
1086                 drv->cs[i].ops = drv->ops;
1087                 drv->cs[i].minor_index = i;
1088                 mutex_init(&drv->cs[i].mutex);
1089         }
1090
1091         gigaset_if_initdriver(drv, procname, devname);
1092
1093         spin_lock_irqsave(&driver_lock, flags);
1094         list_add(&drv->list, &drivers);
1095         spin_unlock_irqrestore(&driver_lock, flags);
1096
1097         return drv;
1098
1099 error:
1100         kfree(drv->cs);
1101         kfree(drv);
1102         return NULL;
1103 }
1104 EXPORT_SYMBOL_GPL(gigaset_initdriver);
1105
1106 void gigaset_blockdriver(struct gigaset_driver *drv)
1107 {
1108         drv->blocked = 1;
1109 }
1110 EXPORT_SYMBOL_GPL(gigaset_blockdriver);
1111
1112 static int __init gigaset_init_module(void)
1113 {
1114         /* in accordance with the principle of least astonishment,
1115          * setting the 'debug' parameter to 1 activates a sensible
1116          * set of default debug levels
1117          */
1118         if (gigaset_debuglevel == 1)
1119                 gigaset_debuglevel = DEBUG_DEFAULT;
1120
1121         pr_info(DRIVER_DESC "\n");
1122         return 0;
1123 }
1124
1125 static void __exit gigaset_exit_module(void)
1126 {
1127 }
1128
1129 module_init(gigaset_init_module);
1130 module_exit(gigaset_exit_module);
1131
1132 MODULE_AUTHOR(DRIVER_AUTHOR);
1133 MODULE_DESCRIPTION(DRIVER_DESC);
1134
1135 MODULE_LICENSE("GPL");