drivers/isdn/gigaset/common.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/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 #define ASSIGNED        0x04
  35
  36 void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
  37                         size_t len, const unsigned char *buf)
  38 {
  39         unsigned char outbuf[80];
  40         unsigned char c;
  41         size_t space = sizeof outbuf - 1;
  42         unsigned char *out = outbuf;
  43         size_t numin = len;
  44
  45         while (numin--) {
  46                 c = *buf++;
  47                 if (c == '~' || c == '^' || c == '\\') {
  48                         if (!space--)
  49                                 break;
  50                         *out++ = '\\';
  51                 }
  52                 if (c & 0x80) {
  53                         if (!space--)
  54                                 break;
  55                         *out++ = '~';
  56                         c ^= 0x80;
  57                 }
  58                 if (c < 0x20 || c == 0x7f) {
  59                         if (!space--)
  60                                 break;
  61                         *out++ = '^';
  62                         c ^= 0x40;
  63                 }
  64                 if (!space--)
  65                         break;
  66                 *out++ = c;
  67         }
  68         *out = 0;
  69
  70         gig_dbg(level, "%s (%u bytes): %s", msg, (unsigned) len, outbuf);
  71 }
  72 EXPORT_SYMBOL_GPL(gigaset_dbg_buffer);
  73
  74 static int setflags(struct cardstate *cs, unsigned flags, unsigned delay)
  75 {
  76         int r;
  77
  78         r = cs->ops->set_modem_ctrl(cs, cs->control_state, flags);
  79         cs->control_state = flags;
  80         if (r < 0)
  81                 return r;
  82
  83         if (delay) {
  84                 set_current_state(TASK_INTERRUPTIBLE);
  85                 schedule_timeout(delay * HZ / 1000);
  86         }
  87
  88         return 0;
  89 }
  90
  91 int gigaset_enterconfigmode(struct cardstate *cs)
  92 {
  93         int i, r;
  94
  95         cs->control_state = TIOCM_RTS; //FIXME
  96
  97         r = setflags(cs, TIOCM_DTR, 200);
  98         if (r < 0)
  99                 goto error;
 100         r = setflags(cs, 0, 200);
 101         if (r < 0)
 102                 goto error;
 103         for (i = 0; i < 5; ++i) {
 104                 r = setflags(cs, TIOCM_RTS, 100);
 105                 if (r < 0)
 106                         goto error;
 107                 r = setflags(cs, 0, 100);
 108                 if (r < 0)
 109                         goto error;
 110         }
 111         r = setflags(cs, TIOCM_RTS|TIOCM_DTR, 800);
 112         if (r < 0)
 113                 goto error;
 114
 115         return 0;
 116
 117 error:
 118         dev_err(cs->dev, "error %d on setuartbits\n", -r);
 119         cs->control_state = TIOCM_RTS|TIOCM_DTR; // FIXME is this a good value?
 120         cs->ops->set_modem_ctrl(cs, 0, TIOCM_RTS|TIOCM_DTR);
 121
 122         return -1; //r
 123 }
 124
 125 static int test_timeout(struct at_state_t *at_state)
 126 {
 127         if (!at_state->timer_expires)
 128                 return 0;
 129
 130         if (--at_state->timer_expires) {
 131                 gig_dbg(DEBUG_MCMD, "decreased timer of %p to %lu",
 132                         at_state, at_state->timer_expires);
 133                 return 0;
 134         }
 135
 136         if (!gigaset_add_event(at_state->cs, at_state, EV_TIMEOUT, NULL,
 137                                at_state->timer_index, NULL)) {
 138                 //FIXME what should we do?
 139         }
 140
 141         return 1;
 142 }
 143
 144 static void timer_tick(unsigned long data)
 145 {
 146         struct cardstate *cs = (struct cardstate *) data;
 147         unsigned long flags;
 148         unsigned channel;
 149         struct at_state_t *at_state;
 150         int timeout = 0;
 151
 152         spin_lock_irqsave(&cs->lock, flags);
 153
 154         for (channel = 0; channel < cs->channels; ++channel)
 155                 if (test_timeout(&cs->bcs[channel].at_state))
 156                         timeout = 1;
 157
 158         if (test_timeout(&cs->at_state))
 159                 timeout = 1;
 160
 161         list_for_each_entry(at_state, &cs->temp_at_states, list)
 162                 if (test_timeout(at_state))
 163                         timeout = 1;
 164
 165         if (cs->running) {
 166                 mod_timer(&cs->timer, jiffies + msecs_to_jiffies(GIG_TICK));
 167                 if (timeout) {
 168                         gig_dbg(DEBUG_CMD, "scheduling timeout");
 169                         tasklet_schedule(&cs->event_tasklet);
 170                 }
 171         }
 172
 173         spin_unlock_irqrestore(&cs->lock, flags);
 174 }
 175
 176 int gigaset_get_channel(struct bc_state *bcs)
 177 {
 178         unsigned long flags;
 179
 180         spin_lock_irqsave(&bcs->cs->lock, flags);
 181         if (bcs->use_count) {
 182                 gig_dbg(DEBUG_ANY, "could not allocate channel %d",
 183                         bcs->channel);
 184                 spin_unlock_irqrestore(&bcs->cs->lock, flags);
 185                 return 0;
 186         }
 187         ++bcs->use_count;
 188         bcs->busy = 1;
 189         gig_dbg(DEBUG_ANY, "allocated channel %d", bcs->channel);
 190         spin_unlock_irqrestore(&bcs->cs->lock, flags);
 191         return 1;
 192 }
 193
 194 void gigaset_free_channel(struct bc_state *bcs)
 195 {
 196         unsigned long flags;
 197
 198         spin_lock_irqsave(&bcs->cs->lock, flags);
 199         if (!bcs->busy) {
 200                 gig_dbg(DEBUG_ANY, "could not free channel %d", bcs->channel);
 201                 spin_unlock_irqrestore(&bcs->cs->lock, flags);
 202                 return;
 203         }
 204         --bcs->use_count;
 205         bcs->busy = 0;
 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                 err("event queue full");
 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 *ret = NULL;
 360
 361         spin_lock_irqsave(&drv->lock, flags);
 362         for (i = 0; i < drv->minors; ++i) {
 363                 if (!(drv->flags[i] & VALID_MINOR)) {
 364                         if (try_module_get(drv->owner)) {
 365                                 drv->flags[i] = VALID_MINOR;
 366                                 ret = drv->cs + i;
 367                         }
 368                         break;
 369                 }
 370         }
 371         spin_unlock_irqrestore(&drv->lock, flags);
 372         return ret;
 373 }
 374
 375 static void free_cs(struct cardstate *cs)
 376 {
 377         unsigned long flags;
 378         struct gigaset_driver *drv = cs->driver;
 379         spin_lock_irqsave(&drv->lock, flags);
 380         if (drv->flags[cs->minor_index] & VALID_MINOR)
 381                 module_put(drv->owner);
 382         drv->flags[cs->minor_index] = 0;
 383         spin_unlock_irqrestore(&drv->lock, flags);
 384 }
 385
 386 static void make_valid(struct cardstate *cs, unsigned mask)
 387 {
 388         unsigned long flags;
 389         struct gigaset_driver *drv = cs->driver;
 390         spin_lock_irqsave(&drv->lock, flags);
 391         drv->flags[cs->minor_index] |= mask;
 392         spin_unlock_irqrestore(&drv->lock, flags);
 393 }
 394
 395 static void make_invalid(struct cardstate *cs, unsigned mask)
 396 {
 397         unsigned long flags;
 398         struct gigaset_driver *drv = cs->driver;
 399         spin_lock_irqsave(&drv->lock, flags);
 400         drv->flags[cs->minor_index] &= ~mask;
 401         spin_unlock_irqrestore(&drv->lock, flags);
 402 }
 403
 404 void gigaset_freecs(struct cardstate *cs)
 405 {
 406         int i;
 407         unsigned long flags;
 408
 409         if (!cs)
 410                 return;
 411
 412         mutex_lock(&cs->mutex);
 413
 414         if (!cs->bcs)
 415                 goto f_cs;
 416         if (!cs->inbuf)
 417                 goto f_bcs;
 418
 419         spin_lock_irqsave(&cs->lock, flags);
 420         cs->running = 0;
 421         spin_unlock_irqrestore(&cs->lock, flags); /* event handler and timer are
 422                                                      not rescheduled below */
 423
 424         tasklet_kill(&cs->event_tasklet);
 425         del_timer_sync(&cs->timer);
 426
 427         switch (cs->cs_init) {
 428         default:
 429                 /* clear device sysfs */
 430                 gigaset_free_dev_sysfs(cs);
 431
 432                 gigaset_if_free(cs);
 433
 434                 gig_dbg(DEBUG_INIT, "clearing hw");
 435                 cs->ops->freecshw(cs);
 436
 437                 //FIXME cmdbuf
 438
 439                 /* fall through */
 440         case 2: /* error in initcshw */
 441                 /* Deregister from LL */
 442                 make_invalid(cs, VALID_ID);
 443                 gig_dbg(DEBUG_INIT, "clearing iif");
 444                 gigaset_i4l_cmd(cs, ISDN_STAT_UNLOAD);
 445
 446                 /* fall through */
 447         case 1: /* error when regestering to LL */
 448                 gig_dbg(DEBUG_INIT, "clearing at_state");
 449                 clear_at_state(&cs->at_state);
 450                 dealloc_at_states(cs);
 451
 452                 /* fall through */
 453         case 0: /* error in one call to initbcs */
 454                 for (i = 0; i < cs->channels; ++i) {
 455                         gig_dbg(DEBUG_INIT, "clearing bcs[%d]", i);
 456                         gigaset_freebcs(cs->bcs + i);
 457                 }
 458
 459                 clear_events(cs);
 460                 gig_dbg(DEBUG_INIT, "freeing inbuf");
 461                 kfree(cs->inbuf);
 462         }
 463 f_bcs:  gig_dbg(DEBUG_INIT, "freeing bcs[]");
 464         kfree(cs->bcs);
 465 f_cs:   gig_dbg(DEBUG_INIT, "freeing cs");
 466         mutex_unlock(&cs->mutex);
 467         free_cs(cs);
 468 }
 469 EXPORT_SYMBOL_GPL(gigaset_freecs);
 470
 471 void gigaset_at_init(struct at_state_t *at_state, struct bc_state *bcs,
 472                      struct cardstate *cs, int cid)
 473 {
 474         int i;
 475
 476         INIT_LIST_HEAD(&at_state->list);
 477         at_state->waiting = 0;
 478         at_state->getstring = 0;
 479         at_state->pending_commands = 0;
 480         at_state->timer_expires = 0;
 481         at_state->timer_active = 0;
 482         at_state->timer_index = 0;
 483         at_state->seq_index = 0;
 484         at_state->ConState = 0;
 485         for (i = 0; i < STR_NUM; ++i)
 486                 at_state->str_var[i] = NULL;
 487         at_state->int_var[VAR_ZDLE] = 0;
 488         at_state->int_var[VAR_ZCTP] = -1;
 489         at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
 490         at_state->cs = cs;
 491         at_state->bcs = bcs;
 492         at_state->cid = cid;
 493         if (!cid)
 494                 at_state->replystruct = cs->tabnocid;
 495         else
 496                 at_state->replystruct = cs->tabcid;
 497 }
 498
 499
 500 static void gigaset_inbuf_init(struct inbuf_t *inbuf, struct bc_state *bcs,
 501                                struct cardstate *cs, int inputstate)
 502 /* inbuf->read must be allocated before! */
 503 {
 504         atomic_set(&inbuf->head, 0);
 505         atomic_set(&inbuf->tail, 0);
 506         inbuf->cs = cs;
 507         inbuf->bcs = bcs; /*base driver: NULL*/
 508         inbuf->rcvbuf = NULL; //FIXME
 509         inbuf->inputstate = inputstate;
 510 }
 511
 512 /* append received bytes to inbuf */
 513 int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src,
 514                        unsigned numbytes)
 515 {
 516         unsigned n, head, tail, bytesleft;
 517
 518         gig_dbg(DEBUG_INTR, "received %u bytes", numbytes);
 519
 520         if (!numbytes)
 521                 return 0;
 522
 523         bytesleft = numbytes;
 524         tail = atomic_read(&inbuf->tail);
 525         head = atomic_read(&inbuf->head);
 526         gig_dbg(DEBUG_INTR, "buffer state: %u -> %u", head, tail);
 527
 528         while (bytesleft) {
 529                 if (head > tail)
 530                         n = head - 1 - tail;
 531                 else if (head == 0)
 532                         n = (RBUFSIZE-1) - tail;
 533                 else
 534                         n = RBUFSIZE - tail;
 535                 if (!n) {
 536                         dev_err(inbuf->cs->dev,
 537                                 "buffer overflow (%u bytes lost)\n",
 538                                 bytesleft);
 539                         break;
 540                 }
 541                 if (n > bytesleft)
 542                         n = bytesleft;
 543                 memcpy(inbuf->data + tail, src, n);
 544                 bytesleft -= n;
 545                 tail = (tail + n) % RBUFSIZE;
 546                 src += n;
 547         }
 548         gig_dbg(DEBUG_INTR, "setting tail to %u", tail);
 549         atomic_set(&inbuf->tail, tail);
 550         return numbytes != bytesleft;
 551 }
 552 EXPORT_SYMBOL_GPL(gigaset_fill_inbuf);
 553
 554 /* Initialize the b-channel structure */
 555 static struct bc_state *gigaset_initbcs(struct bc_state *bcs,
 556                                         struct cardstate *cs, int channel)
 557 {
 558         int i;
 559
 560         bcs->tx_skb = NULL; //FIXME -> hw part
 561
 562         skb_queue_head_init(&bcs->squeue);
 563
 564         bcs->corrupted = 0;
 565         bcs->trans_down = 0;
 566         bcs->trans_up = 0;
 567
 568         gig_dbg(DEBUG_INIT, "setting up bcs[%d]->at_state", channel);
 569         gigaset_at_init(&bcs->at_state, bcs, cs, -1);
 570
 571         bcs->rcvbytes = 0;
 572
 573 #ifdef CONFIG_GIGASET_DEBUG
 574         bcs->emptycount = 0;
 575 #endif
 576
 577         gig_dbg(DEBUG_INIT, "allocating bcs[%d]->skb", channel);
 578         bcs->fcs = PPP_INITFCS;
 579         bcs->inputstate = 0;
 580         if (cs->ignoreframes) {
 581                 bcs->inputstate |= INS_skip_frame;
 582                 bcs->skb = NULL;
 583         } else if ((bcs->skb = dev_alloc_skb(SBUFSIZE + HW_HDR_LEN)) != NULL)
 584                 skb_reserve(bcs->skb, HW_HDR_LEN);
 585         else {
 586                 warn("could not allocate skb");
 587                 bcs->inputstate |= INS_skip_frame;
 588         }
 589
 590         bcs->channel = channel;
 591         bcs->cs = cs;
 592
 593         bcs->chstate = 0;
 594         bcs->use_count = 1;
 595         bcs->busy = 0;
 596         bcs->ignore = cs->ignoreframes;
 597
 598         for (i = 0; i < AT_NUM; ++i)
 599                 bcs->commands[i] = NULL;
 600
 601         gig_dbg(DEBUG_INIT, "  setting up bcs[%d]->hw", channel);
 602         if (cs->ops->initbcshw(bcs))
 603                 return bcs;
 604
 605         gig_dbg(DEBUG_INIT, "  failed");
 606
 607         gig_dbg(DEBUG_INIT, "  freeing bcs[%d]->skb", channel);
 608         if (bcs->skb)
 609                 dev_kfree_skb(bcs->skb);
 610
 611         return NULL;
 612 }
 613
 614 /* gigaset_initcs
 615  * Allocate and initialize cardstate structure for Gigaset driver
 616  * Calls hardware dependent gigaset_initcshw() function
 617  * Calls B channel initialization function gigaset_initbcs() for each B channel
 618  * parameters:
 619  *      drv             hardware driver the device belongs to
 620  *      channels        number of B channels supported by device
 621  *      onechannel      !=0: B channel data and AT commands share one
 622  *                           communication channel
 623  *                      ==0: B channels have separate communication channels
 624  *      ignoreframes    number of frames to ignore after setting up B channel
 625  *      cidmode         !=0: start in CallID mode
 626  *      modulename      name of driver module (used for I4L registration)
 627  * return value:
 628  *      pointer to cardstate structure
 629  */
 630 struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels,
 631                                  int onechannel, int ignoreframes,
 632                                  int cidmode, const char *modulename)
 633 {
 634         struct cardstate *cs = NULL;
 635         unsigned long flags;
 636         int i;
 637
 638         gig_dbg(DEBUG_INIT, "allocating cs");
 639         if (!(cs = alloc_cs(drv))) {
 640                 err("maximum number of devices exceeded");
 641                 return NULL;
 642         }
 643         mutex_init(&cs->mutex);
 644
 645         gig_dbg(DEBUG_INIT, "allocating bcs[0..%d]", channels - 1);
 646         cs->bcs = kmalloc(channels * sizeof(struct bc_state), GFP_KERNEL);
 647         if (!cs->bcs) {
 648                 err("out of memory");
 649                 goto error;
 650         }
 651         gig_dbg(DEBUG_INIT, "allocating inbuf");
 652         cs->inbuf = kmalloc(sizeof(struct inbuf_t), GFP_KERNEL);
 653         if (!cs->inbuf) {
 654                 err("out of memory");
 655                 goto error;
 656         }
 657
 658         cs->cs_init = 0;
 659         cs->channels = channels;
 660         cs->onechannel = onechannel;
 661         cs->ignoreframes = ignoreframes;
 662         INIT_LIST_HEAD(&cs->temp_at_states);
 663         cs->running = 0;
 664         init_timer(&cs->timer); /* clear next & prev */
 665         spin_lock_init(&cs->ev_lock);
 666         cs->ev_tail = 0;
 667         cs->ev_head = 0;
 668
 669         tasklet_init(&cs->event_tasklet, &gigaset_handle_event,
 670                      (unsigned long) cs);
 671         atomic_set(&cs->commands_pending, 0);
 672         cs->cur_at_seq = 0;
 673         cs->gotfwver = -1;
 674         cs->open_count = 0;
 675         cs->dev = NULL;
 676         cs->tty = NULL;
 677         cs->tty_dev = NULL;
 678         cs->cidmode = cidmode != 0;
 679
 680         //if(onechannel) { //FIXME
 681                 cs->tabnocid = gigaset_tab_nocid_m10x;
 682                 cs->tabcid = gigaset_tab_cid_m10x;
 683         //} else {
 684         //      cs->tabnocid = gigaset_tab_nocid;
 685         //      cs->tabcid = gigaset_tab_cid;
 686         //}
 687
 688         init_waitqueue_head(&cs->waitqueue);
 689         cs->waiting = 0;
 690
 691         atomic_set(&cs->mode, M_UNKNOWN);
 692         atomic_set(&cs->mstate, MS_UNINITIALIZED);
 693
 694         for (i = 0; i < channels; ++i) {
 695                 gig_dbg(DEBUG_INIT, "setting up bcs[%d].read", i);
 696                 if (!gigaset_initbcs(cs->bcs + i, cs, i)) {
 697                         err("could not allocate channel %d data", i);
 698                         goto error;
 699                 }
 700         }
 701
 702         ++cs->cs_init;
 703
 704         gig_dbg(DEBUG_INIT, "setting up at_state");
 705         spin_lock_init(&cs->lock);
 706         gigaset_at_init(&cs->at_state, NULL, cs, 0);
 707         cs->dle = 0;
 708         cs->cbytes = 0;
 709
 710         gig_dbg(DEBUG_INIT, "setting up inbuf");
 711         if (onechannel) {                       //FIXME distinction necessary?
 712                 gigaset_inbuf_init(cs->inbuf, cs->bcs, cs, INS_command);
 713         } else
 714                 gigaset_inbuf_init(cs->inbuf, NULL,    cs, INS_command);
 715
 716         cs->connected = 0;
 717         cs->isdn_up = 0;
 718
 719         gig_dbg(DEBUG_INIT, "setting up cmdbuf");
 720         cs->cmdbuf = cs->lastcmdbuf = NULL;
 721         spin_lock_init(&cs->cmdlock);
 722         cs->curlen = 0;
 723         cs->cmdbytes = 0;
 724
 725         gig_dbg(DEBUG_INIT, "setting up iif");
 726         if (!gigaset_register_to_LL(cs, modulename)) {
 727                 err("register_isdn failed");
 728                 goto error;
 729         }
 730
 731         make_valid(cs, VALID_ID);
 732         ++cs->cs_init;
 733         gig_dbg(DEBUG_INIT, "setting up hw");
 734         if (!cs->ops->initcshw(cs)) {
 735                 err("could not allocate device specific data");
 736                 goto error;
 737         }
 738
 739         ++cs->cs_init;
 740
 741         /* set up character device */
 742         gigaset_if_init(cs);
 743
 744         /* set up device sysfs */
 745         gigaset_init_dev_sysfs(cs);
 746
 747         spin_lock_irqsave(&cs->lock, flags);
 748         cs->running = 1;
 749         spin_unlock_irqrestore(&cs->lock, flags);
 750         setup_timer(&cs->timer, timer_tick, (unsigned long) cs);
 751         cs->timer.expires = jiffies + msecs_to_jiffies(GIG_TICK);
 752         /* FIXME: can jiffies increase too much until the timer is added?
 753          * Same problem(?) with mod_timer() in timer_tick(). */
 754         add_timer(&cs->timer);
 755
 756         gig_dbg(DEBUG_INIT, "cs initialized");
 757         return cs;
 758
 759 error:
 760         gig_dbg(DEBUG_INIT, "failed");
 761         gigaset_freecs(cs);
 762         return NULL;
 763 }
 764 EXPORT_SYMBOL_GPL(gigaset_initcs);
 765
 766 /* ReInitialize the b-channel structure on hangup */
 767 void gigaset_bcs_reinit(struct bc_state *bcs)
 768 {
 769         struct sk_buff *skb;
 770         struct cardstate *cs = bcs->cs;
 771         unsigned long flags;
 772
 773         while ((skb = skb_dequeue(&bcs->squeue)) != NULL)
 774                 dev_kfree_skb(skb);
 775
 776         spin_lock_irqsave(&cs->lock, flags);
 777         clear_at_state(&bcs->at_state);
 778         bcs->at_state.ConState = 0;
 779         bcs->at_state.timer_active = 0;
 780         bcs->at_state.timer_expires = 0;
 781         bcs->at_state.cid = -1;                 /* No CID defined */
 782         spin_unlock_irqrestore(&cs->lock, flags);
 783
 784         bcs->inputstate = 0;
 785
 786 #ifdef CONFIG_GIGASET_DEBUG
 787         bcs->emptycount = 0;
 788 #endif
 789
 790         bcs->fcs = PPP_INITFCS;
 791         bcs->chstate = 0;
 792
 793         bcs->ignore = cs->ignoreframes;
 794         if (bcs->ignore)
 795                 bcs->inputstate |= INS_skip_frame;
 796
 797
 798         cs->ops->reinitbcshw(bcs);
 799 }
 800
 801 static void cleanup_cs(struct cardstate *cs)
 802 {
 803         struct cmdbuf_t *cb, *tcb;
 804         int i;
 805         unsigned long flags;
 806
 807         spin_lock_irqsave(&cs->lock, flags);
 808
 809         atomic_set(&cs->mode, M_UNKNOWN);
 810         atomic_set(&cs->mstate, MS_UNINITIALIZED);
 811
 812         clear_at_state(&cs->at_state);
 813         dealloc_at_states(cs);
 814         free_strings(&cs->at_state);
 815         gigaset_at_init(&cs->at_state, NULL, cs, 0);
 816
 817         kfree(cs->inbuf->rcvbuf);
 818         cs->inbuf->rcvbuf = NULL;
 819         cs->inbuf->inputstate = INS_command;
 820         atomic_set(&cs->inbuf->head, 0);
 821         atomic_set(&cs->inbuf->tail, 0);
 822
 823         cb = cs->cmdbuf;
 824         while (cb) {
 825                 tcb = cb;
 826                 cb = cb->next;
 827                 kfree(tcb);
 828         }
 829         cs->cmdbuf = cs->lastcmdbuf = NULL;
 830         cs->curlen = 0;
 831         cs->cmdbytes = 0;
 832         cs->gotfwver = -1;
 833         cs->dle = 0;
 834         cs->cur_at_seq = 0;
 835         atomic_set(&cs->commands_pending, 0);
 836         cs->cbytes = 0;
 837
 838         spin_unlock_irqrestore(&cs->lock, flags);
 839
 840         for (i = 0; i < cs->channels; ++i) {
 841                 gigaset_freebcs(cs->bcs + i);
 842                 if (!gigaset_initbcs(cs->bcs + i, cs, i))
 843                         break;                  //FIXME error handling
 844         }
 845
 846         if (cs->waiting) {
 847                 cs->cmd_result = -ENODEV;
 848                 cs->waiting = 0;
 849                 wake_up_interruptible(&cs->waitqueue);
 850         }
 851 }
 852
 853
 854 int gigaset_start(struct cardstate *cs)
 855 {
 856         unsigned long flags;
 857
 858         if (mutex_lock_interruptible(&cs->mutex))
 859                 return 0;
 860
 861         spin_lock_irqsave(&cs->lock, flags);
 862         cs->connected = 1;
 863         spin_unlock_irqrestore(&cs->lock, flags);
 864
 865         if (atomic_read(&cs->mstate) != MS_LOCKED) {
 866                 cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR|TIOCM_RTS);
 867                 cs->ops->baud_rate(cs, B115200);
 868                 cs->ops->set_line_ctrl(cs, CS8);
 869                 cs->control_state = TIOCM_DTR|TIOCM_RTS;
 870         } else {
 871                 //FIXME use some saved values?
 872         }
 873
 874         cs->waiting = 1;
 875
 876         if (!gigaset_add_event(cs, &cs->at_state, EV_START, NULL, 0, NULL)) {
 877                 cs->waiting = 0;
 878                 //FIXME what should we do?
 879                 goto error;
 880         }
 881
 882         gig_dbg(DEBUG_CMD, "scheduling START");
 883         gigaset_schedule_event(cs);
 884
 885         wait_event(cs->waitqueue, !cs->waiting);
 886
 887         mutex_unlock(&cs->mutex);
 888         return 1;
 889
 890 error:
 891         mutex_unlock(&cs->mutex);
 892         return 0;
 893 }
 894 EXPORT_SYMBOL_GPL(gigaset_start);
 895
 896 void gigaset_shutdown(struct cardstate *cs)
 897 {
 898         mutex_lock(&cs->mutex);
 899
 900         cs->waiting = 1;
 901
 902         if (!gigaset_add_event(cs, &cs->at_state, EV_SHUTDOWN, NULL, 0, NULL)) {
 903                 //FIXME what should we do?
 904                 goto exit;
 905         }
 906
 907         gig_dbg(DEBUG_CMD, "scheduling SHUTDOWN");
 908         gigaset_schedule_event(cs);
 909
 910         wait_event(cs->waitqueue, !cs->waiting);
 911
 912         cleanup_cs(cs);
 913
 914 exit:
 915         mutex_unlock(&cs->mutex);
 916 }
 917 EXPORT_SYMBOL_GPL(gigaset_shutdown);
 918
 919 void gigaset_stop(struct cardstate *cs)
 920 {
 921         mutex_lock(&cs->mutex);
 922
 923         cs->waiting = 1;
 924
 925         if (!gigaset_add_event(cs, &cs->at_state, EV_STOP, NULL, 0, NULL)) {
 926                 //FIXME what should we do?
 927                 goto exit;
 928         }
 929
 930         gig_dbg(DEBUG_CMD, "scheduling STOP");
 931         gigaset_schedule_event(cs);
 932
 933         wait_event(cs->waitqueue, !cs->waiting);
 934
 935         cleanup_cs(cs);
 936
 937 exit:
 938         mutex_unlock(&cs->mutex);
 939 }
 940 EXPORT_SYMBOL_GPL(gigaset_stop);
 941
 942 static LIST_HEAD(drivers);
 943 static DEFINE_SPINLOCK(driver_lock);
 944
 945 struct cardstate *gigaset_get_cs_by_id(int id)
 946 {
 947         unsigned long flags;
 948         struct cardstate *ret = NULL;
 949         struct cardstate *cs;
 950         struct gigaset_driver *drv;
 951         unsigned i;
 952
 953         spin_lock_irqsave(&driver_lock, flags);
 954         list_for_each_entry(drv, &drivers, list) {
 955                 spin_lock(&drv->lock);
 956                 for (i = 0; i < drv->minors; ++i) {
 957                         if (drv->flags[i] & VALID_ID) {
 958                                 cs = drv->cs + i;
 959                                 if (cs->myid == id)
 960                                         ret = cs;
 961                         }
 962                         if (ret)
 963                                 break;
 964                 }
 965                 spin_unlock(&drv->lock);
 966                 if (ret)
 967                         break;
 968         }
 969         spin_unlock_irqrestore(&driver_lock, flags);
 970         return ret;
 971 }
 972
 973 void gigaset_debugdrivers(void)
 974 {
 975         unsigned long flags;
 976         static struct cardstate *cs;
 977         struct gigaset_driver *drv;
 978         unsigned i;
 979
 980         spin_lock_irqsave(&driver_lock, flags);
 981         list_for_each_entry(drv, &drivers, list) {
 982                 gig_dbg(DEBUG_DRIVER, "driver %p", drv);
 983                 spin_lock(&drv->lock);
 984                 for (i = 0; i < drv->minors; ++i) {
 985                         gig_dbg(DEBUG_DRIVER, "  index %u", i);
 986                         gig_dbg(DEBUG_DRIVER, "    flags 0x%02x",
 987                                 drv->flags[i]);
 988                         cs = drv->cs + i;
 989                         gig_dbg(DEBUG_DRIVER, "    cardstate %p", cs);
 990                         gig_dbg(DEBUG_DRIVER, "    minor_index %u",
 991                                 cs->minor_index);
 992                         gig_dbg(DEBUG_DRIVER, "    driver %p", cs->driver);
 993                         gig_dbg(DEBUG_DRIVER, "    i4l id %d", cs->myid);
 994                 }
 995                 spin_unlock(&drv->lock);
 996         }
 997         spin_unlock_irqrestore(&driver_lock, flags);
 998 }
 999
1000 static struct cardstate *gigaset_get_cs_by_minor(unsigned minor)
1001 {
1002         unsigned long flags;
1003         struct cardstate *ret = NULL;
1004         struct gigaset_driver *drv;
1005         unsigned index;
1006
1007         spin_lock_irqsave(&driver_lock, flags);
1008         list_for_each_entry(drv, &drivers, list) {
1009                 if (minor < drv->minor || minor >= drv->minor + drv->minors)
1010                         continue;
1011                 index = minor - drv->minor;
1012                 spin_lock(&drv->lock);
1013                 if (drv->flags[index] & VALID_MINOR)
1014                         ret = drv->cs + index;
1015                 spin_unlock(&drv->lock);
1016                 if (ret)
1017                         break;
1018         }
1019         spin_unlock_irqrestore(&driver_lock, flags);
1020         return ret;
1021 }
1022
1023 struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty)
1024 {
1025         if (tty->index < 0 || tty->index >= tty->driver->num)
1026                 return NULL;
1027         return gigaset_get_cs_by_minor(tty->index + tty->driver->minor_start);
1028 }
1029
1030 void gigaset_freedriver(struct gigaset_driver *drv)
1031 {
1032         unsigned long flags;
1033
1034         spin_lock_irqsave(&driver_lock, flags);
1035         list_del(&drv->list);
1036         spin_unlock_irqrestore(&driver_lock, flags);
1037
1038         gigaset_if_freedriver(drv);
1039
1040         kfree(drv->cs);
1041         kfree(drv->flags);
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         drv->flags = kmalloc(minors * sizeof *drv->flags, GFP_KERNEL);
1084         if (!drv->flags)
1085                 goto error;
1086
1087         for (i = 0; i < minors; ++i) {
1088                 drv->flags[i] = 0;
1089                 drv->cs[i].driver = drv;
1090                 drv->cs[i].ops = drv->ops;
1091                 drv->cs[i].minor_index = i;
1092         }
1093
1094         gigaset_if_initdriver(drv, procname, devname);
1095
1096         spin_lock_irqsave(&driver_lock, flags);
1097         list_add(&drv->list, &drivers);
1098         spin_unlock_irqrestore(&driver_lock, flags);
1099
1100         return drv;
1101
1102 error:
1103         kfree(drv->cs);
1104         kfree(drv);
1105         return NULL;
1106 }
1107 EXPORT_SYMBOL_GPL(gigaset_initdriver);
1108
1109 /* For drivers without fixed assignment device<->cardstate (usb) */
1110 struct cardstate *gigaset_getunassignedcs(struct gigaset_driver *drv)
1111 {
1112         unsigned long flags;
1113         struct cardstate *cs = NULL;
1114         unsigned i;
1115
1116         spin_lock_irqsave(&drv->lock, flags);
1117         if (drv->blocked)
1118                 goto exit;
1119         for (i = 0; i < drv->minors; ++i) {
1120                 if ((drv->flags[i] & VALID_MINOR) &&
1121                     !(drv->flags[i] & ASSIGNED)) {
1122                         drv->flags[i] |= ASSIGNED;
1123                         cs = drv->cs + i;
1124                         break;
1125                 }
1126         }
1127 exit:
1128         spin_unlock_irqrestore(&drv->lock, flags);
1129         return cs;
1130 }
1131 EXPORT_SYMBOL_GPL(gigaset_getunassignedcs);
1132
1133 void gigaset_unassign(struct cardstate *cs)
1134 {
1135         unsigned long flags;
1136         unsigned *minor_flags;
1137         struct gigaset_driver *drv;
1138
1139         if (!cs)
1140                 return;
1141         drv = cs->driver;
1142         spin_lock_irqsave(&drv->lock, flags);
1143         minor_flags = drv->flags + cs->minor_index;
1144         if (*minor_flags & VALID_MINOR)
1145                 *minor_flags &= ~ASSIGNED;
1146         spin_unlock_irqrestore(&drv->lock, flags);
1147 }
1148 EXPORT_SYMBOL_GPL(gigaset_unassign);
1149
1150 void gigaset_blockdriver(struct gigaset_driver *drv)
1151 {
1152         unsigned long flags;
1153         spin_lock_irqsave(&drv->lock, flags);
1154         drv->blocked = 1;
1155         spin_unlock_irqrestore(&drv->lock, flags);
1156 }
1157 EXPORT_SYMBOL_GPL(gigaset_blockdriver);
1158
1159 static int __init gigaset_init_module(void)
1160 {
1161         /* in accordance with the principle of least astonishment,
1162          * setting the 'debug' parameter to 1 activates a sensible
1163          * set of default debug levels
1164          */
1165         if (gigaset_debuglevel == 1)
1166                 gigaset_debuglevel = DEBUG_DEFAULT;
1167
1168         info(DRIVER_AUTHOR);
1169         info(DRIVER_DESC);
1170         return 0;
1171 }
1172
1173 static void __exit gigaset_exit_module(void)
1174 {
1175 }
1176
1177 module_init(gigaset_init_module);
1178 module_exit(gigaset_exit_module);
1179
1180 MODULE_AUTHOR(DRIVER_AUTHOR);
1181 MODULE_DESCRIPTION(DRIVER_DESC);
1182
1183 MODULE_LICENSE("GPL");