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