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 /**
  42  * gigaset_dbg_buffer() - dump data in ASCII and hex for debugging
  43  * @level:      debugging level.
  44  * @msg:        message prefix.
  45  * @len:        number of bytes to dump.
  46  * @buf:        data to dump.
  47  *
  48  * If the current debugging level includes one of the bits set in @level,
  49  * @len bytes starting at @buf are logged to dmesg at KERN_DEBUG prio,
  50  * prefixed by the text @msg.
  51  */
  52 void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
  53                         size_t len, const unsigned char *buf)
  54 {
  55         unsigned char outbuf[80];
  56         unsigned char c;
  57         size_t space = sizeof outbuf - 1;
  58         unsigned char *out = outbuf;
  59         size_t numin = len;
  60
  61         while (numin--) {
  62                 c = *buf++;
  63                 if (c == '~' || c == '^' || c == '\\') {
  64                         if (!space--)
  65                                 break;
  66                         *out++ = '\\';
  67                 }
  68                 if (c & 0x80) {
  69                         if (!space--)
  70                                 break;
  71                         *out++ = '~';
  72                         c ^= 0x80;
  73                 }
  74                 if (c < 0x20 || c == 0x7f) {
  75                         if (!space--)
  76                                 break;
  77                         *out++ = '^';
  78                         c ^= 0x40;
  79                 }
  80                 if (!space--)
  81                         break;
  82                 *out++ = c;
  83         }
  84         *out = 0;
  85
  86         gig_dbg(level, "%s (%u bytes): %s", msg, (unsigned) len, outbuf);
  87 }
  88 EXPORT_SYMBOL_GPL(gigaset_dbg_buffer);
  89
  90 static int setflags(struct cardstate *cs, unsigned flags, unsigned delay)
  91 {
  92         int r;
  93
  94         r = cs->ops->set_modem_ctrl(cs, cs->control_state, flags);
  95         cs->control_state = flags;
  96         if (r < 0)
  97                 return r;
  98
  99         if (delay) {
 100                 set_current_state(TASK_INTERRUPTIBLE);
 101                 schedule_timeout(delay * HZ / 1000);
 102         }
 103
 104         return 0;
 105 }
 106
 107 int gigaset_enterconfigmode(struct cardstate *cs)
 108 {
 109         int i, r;
 110
 111         cs->control_state = TIOCM_RTS; //FIXME
 112
 113         r = setflags(cs, TIOCM_DTR, 200);
 114         if (r < 0)
 115                 goto error;
 116         r = setflags(cs, 0, 200);
 117         if (r < 0)
 118                 goto error;
 119         for (i = 0; i < 5; ++i) {
 120                 r = setflags(cs, TIOCM_RTS, 100);
 121                 if (r < 0)
 122                         goto error;
 123                 r = setflags(cs, 0, 100);
 124                 if (r < 0)
 125                         goto error;
 126         }
 127         r = setflags(cs, TIOCM_RTS|TIOCM_DTR, 800);
 128         if (r < 0)
 129                 goto error;
 130
 131         return 0;
 132
 133 error:
 134         dev_err(cs->dev, "error %d on setuartbits\n", -r);
 135         cs->control_state = TIOCM_RTS|TIOCM_DTR; // FIXME is this a good value?
 136         cs->ops->set_modem_ctrl(cs, 0, TIOCM_RTS|TIOCM_DTR);
 137
 138         return -1; //r
 139 }
 140
 141 static int test_timeout(struct at_state_t *at_state)
 142 {
 143         if (!at_state->timer_expires)
 144                 return 0;
 145
 146         if (--at_state->timer_expires) {
 147                 gig_dbg(DEBUG_MCMD, "decreased timer of %p to %lu",
 148                         at_state, at_state->timer_expires);
 149                 return 0;
 150         }
 151
 152         if (!gigaset_add_event(at_state->cs, at_state, EV_TIMEOUT, NULL,
 153                                at_state->timer_index, NULL)) {
 154                 //FIXME what should we do?
 155         }
 156
 157         return 1;
 158 }
 159
 160 static void timer_tick(unsigned long data)
 161 {
 162         struct cardstate *cs = (struct cardstate *) data;
 163         unsigned long flags;
 164         unsigned channel;
 165         struct at_state_t *at_state;
 166         int timeout = 0;
 167
 168         spin_lock_irqsave(&cs->lock, flags);
 169
 170         for (channel = 0; channel < cs->channels; ++channel)
 171                 if (test_timeout(&cs->bcs[channel].at_state))
 172                         timeout = 1;
 173
 174         if (test_timeout(&cs->at_state))
 175                 timeout = 1;
 176
 177         list_for_each_entry(at_state, &cs->temp_at_states, list)
 178                 if (test_timeout(at_state))
 179                         timeout = 1;
 180
 181         if (cs->running) {
 182                 mod_timer(&cs->timer, jiffies + msecs_to_jiffies(GIG_TICK));
 183                 if (timeout) {
 184                         gig_dbg(DEBUG_CMD, "scheduling timeout");
 185                         tasklet_schedule(&cs->event_tasklet);
 186                 }
 187         }
 188
 189         spin_unlock_irqrestore(&cs->lock, flags);
 190 }
 191
 192 int gigaset_get_channel(struct bc_state *bcs)
 193 {
 194         unsigned long flags;
 195
 196         spin_lock_irqsave(&bcs->cs->lock, flags);
 197         if (bcs->use_count || !try_module_get(bcs->cs->driver->owner)) {
 198                 gig_dbg(DEBUG_ANY, "could not allocate channel %d",
 199                         bcs->channel);
 200                 spin_unlock_irqrestore(&bcs->cs->lock, flags);
 201                 return 0;
 202         }
 203         ++bcs->use_count;
 204         bcs->busy = 1;
 205         gig_dbg(DEBUG_ANY, "allocated channel %d", bcs->channel);
 206         spin_unlock_irqrestore(&bcs->cs->lock, flags);
 207         return 1;
 208 }
 209
 210 void gigaset_free_channel(struct bc_state *bcs)
 211 {
 212         unsigned long flags;
 213
 214         spin_lock_irqsave(&bcs->cs->lock, flags);
 215         if (!bcs->busy) {
 216                 gig_dbg(DEBUG_ANY, "could not free channel %d", bcs->channel);
 217                 spin_unlock_irqrestore(&bcs->cs->lock, flags);
 218                 return;
 219         }
 220         --bcs->use_count;
 221         bcs->busy = 0;
 222         module_put(bcs->cs->driver->owner);
 223         gig_dbg(DEBUG_ANY, "freed channel %d", bcs->channel);
 224         spin_unlock_irqrestore(&bcs->cs->lock, flags);
 225 }
 226
 227 int gigaset_get_channels(struct cardstate *cs)
 228 {
 229         unsigned long flags;
 230         int i;
 231
 232         spin_lock_irqsave(&cs->lock, flags);
 233         for (i = 0; i < cs->channels; ++i)
 234                 if (cs->bcs[i].use_count) {
 235                         spin_unlock_irqrestore(&cs->lock, flags);
 236                         gig_dbg(DEBUG_ANY, "could not allocate all channels");
 237                         return 0;
 238                 }
 239         for (i = 0; i < cs->channels; ++i)
 240                 ++cs->bcs[i].use_count;
 241         spin_unlock_irqrestore(&cs->lock, flags);
 242
 243         gig_dbg(DEBUG_ANY, "allocated all channels");
 244
 245         return 1;
 246 }
 247
 248 void gigaset_free_channels(struct cardstate *cs)
 249 {
 250         unsigned long flags;
 251         int i;
 252
 253         gig_dbg(DEBUG_ANY, "unblocking all channels");
 254         spin_lock_irqsave(&cs->lock, flags);
 255         for (i = 0; i < cs->channels; ++i)
 256                 --cs->bcs[i].use_count;
 257         spin_unlock_irqrestore(&cs->lock, flags);
 258 }
 259
 260 void gigaset_block_channels(struct cardstate *cs)
 261 {
 262         unsigned long flags;
 263         int i;
 264
 265         gig_dbg(DEBUG_ANY, "blocking all channels");
 266         spin_lock_irqsave(&cs->lock, flags);
 267         for (i = 0; i < cs->channels; ++i)
 268                 ++cs->bcs[i].use_count;
 269         spin_unlock_irqrestore(&cs->lock, flags);
 270 }
 271
 272 static void clear_events(struct cardstate *cs)
 273 {
 274         struct event_t *ev;
 275         unsigned head, tail;
 276         unsigned long flags;
 277
 278         spin_lock_irqsave(&cs->ev_lock, flags);
 279
 280         head = cs->ev_head;
 281         tail = cs->ev_tail;
 282
 283         while (tail != head) {
 284                 ev = cs->events + head;
 285                 kfree(ev->ptr);
 286                 head = (head + 1) % MAX_EVENTS;
 287         }
 288
 289         cs->ev_head = tail;
 290
 291         spin_unlock_irqrestore(&cs->ev_lock, flags);
 292 }
 293
 294 /**
 295  * gigaset_add_event() - add event to device event queue
 296  * @cs:         device descriptor structure.
 297  * @at_state:   connection state structure.
 298  * @type:       event type.
 299  * @ptr:        pointer parameter for event.
 300  * @parameter:  integer parameter for event.
 301  * @arg:        pointer parameter for event.
 302  *
 303  * Allocate an event queue entry from the device's event queue, and set it up
 304  * with the parameters given.
 305  *
 306  * Return value: added event
 307  */
 308 struct event_t *gigaset_add_event(struct cardstate *cs,
 309                                   struct at_state_t *at_state, int type,
 310                                   void *ptr, int parameter, void *arg)
 311 {
 312         unsigned long flags;
 313         unsigned next, tail;
 314         struct event_t *event = NULL;
 315
 316         spin_lock_irqsave(&cs->ev_lock, flags);
 317
 318         tail = cs->ev_tail;
 319         next = (tail + 1) % MAX_EVENTS;
 320         if (unlikely(next == cs->ev_head))
 321                 dev_err(cs->dev, "event queue full\n");
 322         else {
 323                 event = cs->events + tail;
 324                 event->type = type;
 325                 event->at_state = at_state;
 326                 event->cid = -1;
 327                 event->ptr = ptr;
 328                 event->arg = arg;
 329                 event->parameter = parameter;
 330                 cs->ev_tail = next;
 331         }
 332
 333         spin_unlock_irqrestore(&cs->ev_lock, flags);
 334
 335         return event;
 336 }
 337 EXPORT_SYMBOL_GPL(gigaset_add_event);
 338
 339 static void free_strings(struct at_state_t *at_state)
 340 {
 341         int i;
 342
 343         for (i = 0; i < STR_NUM; ++i) {
 344                 kfree(at_state->str_var[i]);
 345                 at_state->str_var[i] = NULL;
 346         }
 347 }
 348
 349 static void clear_at_state(struct at_state_t *at_state)
 350 {
 351         free_strings(at_state);
 352 }
 353
 354 static void dealloc_at_states(struct cardstate *cs)
 355 {
 356         struct at_state_t *cur, *next;
 357
 358         list_for_each_entry_safe(cur, next, &cs->temp_at_states, list) {
 359                 list_del(&cur->list);
 360                 free_strings(cur);
 361                 kfree(cur);
 362         }
 363 }
 364
 365 static void gigaset_freebcs(struct bc_state *bcs)
 366 {
 367         int i;
 368
 369         gig_dbg(DEBUG_INIT, "freeing bcs[%d]->hw", bcs->channel);
 370         if (!bcs->cs->ops->freebcshw(bcs)) {
 371                 gig_dbg(DEBUG_INIT, "failed");
 372         }
 373
 374         gig_dbg(DEBUG_INIT, "clearing bcs[%d]->at_state", bcs->channel);
 375         clear_at_state(&bcs->at_state);
 376         gig_dbg(DEBUG_INIT, "freeing bcs[%d]->skb", bcs->channel);
 377
 378         if (bcs->skb)
 379                 dev_kfree_skb(bcs->skb);
 380         for (i = 0; i < AT_NUM; ++i) {
 381                 kfree(bcs->commands[i]);
 382                 bcs->commands[i] = NULL;
 383         }
 384 }
 385
 386 static struct cardstate *alloc_cs(struct gigaset_driver *drv)
 387 {
 388         unsigned long flags;
 389         unsigned i;
 390         struct cardstate *cs;
 391         struct cardstate *ret = NULL;
 392
 393         spin_lock_irqsave(&drv->lock, flags);
 394         if (drv->blocked)
 395                 goto exit;
 396         for (i = 0; i < drv->minors; ++i) {
 397                 cs = drv->cs + i;
 398                 if (!(cs->flags & VALID_MINOR)) {
 399                         cs->flags = VALID_MINOR;
 400                         ret = cs;
 401                         break;
 402                 }
 403         }
 404 exit:
 405         spin_unlock_irqrestore(&drv->lock, flags);
 406         return ret;
 407 }
 408
 409 static void free_cs(struct cardstate *cs)
 410 {
 411         cs->flags = 0;
 412 }
 413
 414 static void make_valid(struct cardstate *cs, unsigned mask)
 415 {
 416         unsigned long flags;
 417         struct gigaset_driver *drv = cs->driver;
 418         spin_lock_irqsave(&drv->lock, flags);
 419         cs->flags |= mask;
 420         spin_unlock_irqrestore(&drv->lock, flags);
 421 }
 422
 423 static void make_invalid(struct cardstate *cs, unsigned mask)
 424 {
 425         unsigned long flags;
 426         struct gigaset_driver *drv = cs->driver;
 427         spin_lock_irqsave(&drv->lock, flags);
 428         cs->flags &= ~mask;
 429         spin_unlock_irqrestore(&drv->lock, flags);
 430 }
 431
 432 /**
 433  * gigaset_freecs() - free all associated ressources of a device
 434  * @cs:         device descriptor structure.
 435  *
 436  * Stops all tasklets and timers, unregisters the device from all
 437  * subsystems it was registered to, deallocates the device structure
 438  * @cs and all structures referenced from it.
 439  * Operations on the device should be stopped before calling this.
 440  */
 441 void gigaset_freecs(struct cardstate *cs)
 442 {
 443         int i;
 444         unsigned long flags;
 445
 446         if (!cs)
 447                 return;
 448
 449         mutex_lock(&cs->mutex);
 450
 451         if (!cs->bcs)
 452                 goto f_cs;
 453         if (!cs->inbuf)
 454                 goto f_bcs;
 455
 456         spin_lock_irqsave(&cs->lock, flags);
 457         cs->running = 0;
 458         spin_unlock_irqrestore(&cs->lock, flags); /* event handler and timer are
 459                                                      not rescheduled below */
 460
 461         tasklet_kill(&cs->event_tasklet);
 462         del_timer_sync(&cs->timer);
 463
 464         switch (cs->cs_init) {
 465         default:
 466                 /* clear device sysfs */
 467                 gigaset_free_dev_sysfs(cs);
 468
 469                 gigaset_if_free(cs);
 470
 471                 gig_dbg(DEBUG_INIT, "clearing hw");
 472                 cs->ops->freecshw(cs);
 473
 474                 //FIXME cmdbuf
 475
 476                 /* fall through */
 477         case 2: /* error in initcshw */
 478                 /* Deregister from LL */
 479                 make_invalid(cs, VALID_ID);
 480                 gig_dbg(DEBUG_INIT, "clearing iif");
 481                 gigaset_i4l_cmd(cs, ISDN_STAT_UNLOAD);
 482
 483                 /* fall through */
 484         case 1: /* error when regestering to LL */
 485                 gig_dbg(DEBUG_INIT, "clearing at_state");
 486                 clear_at_state(&cs->at_state);
 487                 dealloc_at_states(cs);
 488
 489                 /* fall through */
 490         case 0: /* error in one call to initbcs */
 491                 for (i = 0; i < cs->channels; ++i) {
 492                         gig_dbg(DEBUG_INIT, "clearing bcs[%d]", i);
 493                         gigaset_freebcs(cs->bcs + i);
 494                 }
 495
 496                 clear_events(cs);
 497                 gig_dbg(DEBUG_INIT, "freeing inbuf");
 498                 kfree(cs->inbuf);
 499         }
 500 f_bcs:  gig_dbg(DEBUG_INIT, "freeing bcs[]");
 501         kfree(cs->bcs);
 502 f_cs:   gig_dbg(DEBUG_INIT, "freeing cs");
 503         mutex_unlock(&cs->mutex);
 504         free_cs(cs);
 505 }
 506 EXPORT_SYMBOL_GPL(gigaset_freecs);
 507
 508 void gigaset_at_init(struct at_state_t *at_state, struct bc_state *bcs,
 509                      struct cardstate *cs, int cid)
 510 {
 511         int i;
 512
 513         INIT_LIST_HEAD(&at_state->list);
 514         at_state->waiting = 0;
 515         at_state->getstring = 0;
 516         at_state->pending_commands = 0;
 517         at_state->timer_expires = 0;
 518         at_state->timer_active = 0;
 519         at_state->timer_index = 0;
 520         at_state->seq_index = 0;
 521         at_state->ConState = 0;
 522         for (i = 0; i < STR_NUM; ++i)
 523                 at_state->str_var[i] = NULL;
 524         at_state->int_var[VAR_ZDLE] = 0;
 525         at_state->int_var[VAR_ZCTP] = -1;
 526         at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
 527         at_state->cs = cs;
 528         at_state->bcs = bcs;
 529         at_state->cid = cid;
 530         if (!cid)
 531                 at_state->replystruct = cs->tabnocid;
 532         else
 533                 at_state->replystruct = cs->tabcid;
 534 }
 535
 536
 537 static void gigaset_inbuf_init(struct inbuf_t *inbuf, struct bc_state *bcs,
 538                                struct cardstate *cs, int inputstate)
 539 /* inbuf->read must be allocated before! */
 540 {
 541         inbuf->head = 0;
 542         inbuf->tail = 0;
 543         inbuf->cs = cs;
 544         inbuf->bcs = bcs; /*base driver: NULL*/
 545         inbuf->rcvbuf = NULL;
 546         inbuf->inputstate = inputstate;
 547 }
 548
 549 /**
 550  * gigaset_fill_inbuf() - append received data to input buffer
 551  * @inbuf:      buffer structure.
 552  * @src:        received data.
 553  * @numbytes:   number of bytes received.
 554  */
 555 int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src,
 556                        unsigned numbytes)
 557 {
 558         unsigned n, head, tail, bytesleft;
 559
 560         gig_dbg(DEBUG_INTR, "received %u bytes", numbytes);
 561
 562         if (!numbytes)
 563                 return 0;
 564
 565         bytesleft = numbytes;
 566         tail = inbuf->tail;
 567         head = inbuf->head;
 568         gig_dbg(DEBUG_INTR, "buffer state: %u -> %u", head, tail);
 569
 570         while (bytesleft) {
 571                 if (head > tail)
 572                         n = head - 1 - tail;
 573                 else if (head == 0)
 574                         n = (RBUFSIZE-1) - tail;
 575                 else
 576                         n = RBUFSIZE - tail;
 577                 if (!n) {
 578                         dev_err(inbuf->cs->dev,
 579                                 "buffer overflow (%u bytes lost)\n",
 580                                 bytesleft);
 581                         break;
 582                 }
 583                 if (n > bytesleft)
 584                         n = bytesleft;
 585                 memcpy(inbuf->data + tail, src, n);
 586                 bytesleft -= n;
 587                 tail = (tail + n) % RBUFSIZE;
 588                 src += n;
 589         }
 590         gig_dbg(DEBUG_INTR, "setting tail to %u", tail);
 591         inbuf->tail = tail;
 592         return numbytes != bytesleft;
 593 }
 594 EXPORT_SYMBOL_GPL(gigaset_fill_inbuf);
 595
 596 /* Initialize the b-channel structure */
 597 static struct bc_state *gigaset_initbcs(struct bc_state *bcs,
 598                                         struct cardstate *cs, int channel)
 599 {
 600         int i;
 601
 602         bcs->tx_skb = NULL; //FIXME -> hw part
 603
 604         skb_queue_head_init(&bcs->squeue);
 605
 606         bcs->corrupted = 0;
 607         bcs->trans_down = 0;
 608         bcs->trans_up = 0;
 609
 610         gig_dbg(DEBUG_INIT, "setting up bcs[%d]->at_state", channel);
 611         gigaset_at_init(&bcs->at_state, bcs, cs, -1);
 612
 613 #ifdef CONFIG_GIGASET_DEBUG
 614         bcs->emptycount = 0;
 615 #endif
 616
 617         gig_dbg(DEBUG_INIT, "allocating bcs[%d]->skb", channel);
 618         bcs->fcs = PPP_INITFCS;
 619         bcs->inputstate = 0;
 620         if (cs->ignoreframes) {
 621                 bcs->inputstate |= INS_skip_frame;
 622                 bcs->skb = NULL;
 623         } else if ((bcs->skb = dev_alloc_skb(SBUFSIZE + HW_HDR_LEN)) != NULL)
 624                 skb_reserve(bcs->skb, HW_HDR_LEN);
 625         else {
 626                 pr_err("out of memory\n");
 627                 bcs->inputstate |= INS_skip_frame;
 628         }
 629
 630         bcs->channel = channel;
 631         bcs->cs = cs;
 632
 633         bcs->chstate = 0;
 634         bcs->use_count = 1;
 635         bcs->busy = 0;
 636         bcs->ignore = cs->ignoreframes;
 637
 638         for (i = 0; i < AT_NUM; ++i)
 639                 bcs->commands[i] = NULL;
 640
 641         gig_dbg(DEBUG_INIT, "  setting up bcs[%d]->hw", channel);
 642         if (cs->ops->initbcshw(bcs))
 643                 return bcs;
 644
 645         gig_dbg(DEBUG_INIT, "  failed");
 646
 647         gig_dbg(DEBUG_INIT, "  freeing bcs[%d]->skb", channel);
 648         if (bcs->skb)
 649                 dev_kfree_skb(bcs->skb);
 650
 651         return NULL;
 652 }
 653
 654 /**
 655  * gigaset_initcs() - initialize device structure
 656  * @drv:        hardware driver the device belongs to
 657  * @channels:   number of B channels supported by device
 658  * @onechannel: !=0 if B channel data and AT commands share one
 659  *                  communication channel (M10x),
 660  *              ==0 if B channels have separate communication channels (base)
 661  * @ignoreframes:       number of frames to ignore after setting up B channel
 662  * @cidmode:    !=0: start in CallID mode
 663  * @modulename: name of driver module for LL registration
 664  *
 665  * Allocate and initialize cardstate structure for Gigaset driver
 666  * Calls hardware dependent gigaset_initcshw() function
 667  * Calls B channel initialization function gigaset_initbcs() for each B channel
 668  *
 669  * Return value:
 670  *      pointer to cardstate structure
 671  */
 672 struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels,
 673                                  int onechannel, int ignoreframes,
 674                                  int cidmode, const char *modulename)
 675 {
 676         struct cardstate *cs = NULL;
 677         unsigned long flags;
 678         int i;
 679
 680         gig_dbg(DEBUG_INIT, "allocating cs");
 681         if (!(cs = alloc_cs(drv))) {
 682                 pr_err("maximum number of devices exceeded\n");
 683                 return NULL;
 684         }
 685
 686         gig_dbg(DEBUG_INIT, "allocating bcs[0..%d]", channels - 1);
 687         cs->bcs = kmalloc(channels * sizeof(struct bc_state), GFP_KERNEL);
 688         if (!cs->bcs) {
 689                 pr_err("out of memory\n");
 690                 goto error;
 691         }
 692         gig_dbg(DEBUG_INIT, "allocating inbuf");
 693         cs->inbuf = kmalloc(sizeof(struct inbuf_t), GFP_KERNEL);
 694         if (!cs->inbuf) {
 695                 pr_err("out of memory\n");
 696                 goto error;
 697         }
 698
 699         cs->cs_init = 0;
 700         cs->channels = channels;
 701         cs->onechannel = onechannel;
 702         cs->ignoreframes = ignoreframes;
 703         INIT_LIST_HEAD(&cs->temp_at_states);
 704         cs->running = 0;
 705         init_timer(&cs->timer); /* clear next & prev */
 706         spin_lock_init(&cs->ev_lock);
 707         cs->ev_tail = 0;
 708         cs->ev_head = 0;
 709
 710         tasklet_init(&cs->event_tasklet, &gigaset_handle_event,
 711                      (unsigned long) cs);
 712         cs->commands_pending = 0;
 713         cs->cur_at_seq = 0;
 714         cs->gotfwver = -1;
 715         cs->open_count = 0;
 716         cs->dev = NULL;
 717         cs->tty = NULL;
 718         cs->tty_dev = NULL;
 719         cs->cidmode = cidmode != 0;
 720         cs->tabnocid = gigaset_tab_nocid;
 721         cs->tabcid = gigaset_tab_cid;
 722
 723         init_waitqueue_head(&cs->waitqueue);
 724         cs->waiting = 0;
 725
 726         cs->mode = M_UNKNOWN;
 727         cs->mstate = MS_UNINITIALIZED;
 728
 729         for (i = 0; i < channels; ++i) {
 730                 gig_dbg(DEBUG_INIT, "setting up bcs[%d].read", i);
 731                 if (!gigaset_initbcs(cs->bcs + i, cs, i)) {
 732                         pr_err("could not allocate channel %d data\n", i);
 733                         goto error;
 734                 }
 735         }
 736
 737         ++cs->cs_init;
 738
 739         gig_dbg(DEBUG_INIT, "setting up at_state");
 740         spin_lock_init(&cs->lock);
 741         gigaset_at_init(&cs->at_state, NULL, cs, 0);
 742         cs->dle = 0;
 743         cs->cbytes = 0;
 744
 745         gig_dbg(DEBUG_INIT, "setting up inbuf");
 746         if (onechannel) {                       //FIXME distinction necessary?
 747                 gigaset_inbuf_init(cs->inbuf, cs->bcs, cs, INS_command);
 748         } else
 749                 gigaset_inbuf_init(cs->inbuf, NULL,    cs, INS_command);
 750
 751         cs->connected = 0;
 752         cs->isdn_up = 0;
 753
 754         gig_dbg(DEBUG_INIT, "setting up cmdbuf");
 755         cs->cmdbuf = cs->lastcmdbuf = NULL;
 756         spin_lock_init(&cs->cmdlock);
 757         cs->curlen = 0;
 758         cs->cmdbytes = 0;
 759
 760         gig_dbg(DEBUG_INIT, "setting up iif");
 761         if (!gigaset_register_to_LL(cs, modulename)) {
 762                 pr_err("error registering ISDN device\n");
 763                 goto error;
 764         }
 765
 766         make_valid(cs, VALID_ID);
 767         ++cs->cs_init;
 768         gig_dbg(DEBUG_INIT, "setting up hw");
 769         if (!cs->ops->initcshw(cs))
 770                 goto error;
 771
 772         ++cs->cs_init;
 773
 774         /* set up character device */
 775         gigaset_if_init(cs);
 776
 777         /* set up device sysfs */
 778         gigaset_init_dev_sysfs(cs);
 779
 780         spin_lock_irqsave(&cs->lock, flags);
 781         cs->running = 1;
 782         spin_unlock_irqrestore(&cs->lock, flags);
 783         setup_timer(&cs->timer, timer_tick, (unsigned long) cs);
 784         cs->timer.expires = jiffies + msecs_to_jiffies(GIG_TICK);
 785         /* FIXME: can jiffies increase too much until the timer is added?
 786          * Same problem(?) with mod_timer() in timer_tick(). */
 787         add_timer(&cs->timer);
 788
 789         gig_dbg(DEBUG_INIT, "cs initialized");
 790         return cs;
 791
 792 error:
 793         gig_dbg(DEBUG_INIT, "failed");
 794         gigaset_freecs(cs);
 795         return NULL;
 796 }
 797 EXPORT_SYMBOL_GPL(gigaset_initcs);
 798
 799 /* ReInitialize the b-channel structure on hangup */
 800 void gigaset_bcs_reinit(struct bc_state *bcs)
 801 {
 802         struct sk_buff *skb;
 803         struct cardstate *cs = bcs->cs;
 804         unsigned long flags;
 805
 806         while ((skb = skb_dequeue(&bcs->squeue)) != NULL)
 807                 dev_kfree_skb(skb);
 808
 809         spin_lock_irqsave(&cs->lock, flags);
 810         clear_at_state(&bcs->at_state);
 811         bcs->at_state.ConState = 0;
 812         bcs->at_state.timer_active = 0;
 813         bcs->at_state.timer_expires = 0;
 814         bcs->at_state.cid = -1;                 /* No CID defined */
 815         spin_unlock_irqrestore(&cs->lock, flags);
 816
 817         bcs->inputstate = 0;
 818
 819 #ifdef CONFIG_GIGASET_DEBUG
 820         bcs->emptycount = 0;
 821 #endif
 822
 823         bcs->fcs = PPP_INITFCS;
 824         bcs->chstate = 0;
 825
 826         bcs->ignore = cs->ignoreframes;
 827         if (bcs->ignore)
 828                 bcs->inputstate |= INS_skip_frame;
 829
 830
 831         cs->ops->reinitbcshw(bcs);
 832 }
 833
 834 static void cleanup_cs(struct cardstate *cs)
 835 {
 836         struct cmdbuf_t *cb, *tcb;
 837         int i;
 838         unsigned long flags;
 839
 840         spin_lock_irqsave(&cs->lock, flags);
 841
 842         cs->mode = M_UNKNOWN;
 843         cs->mstate = MS_UNINITIALIZED;
 844
 845         clear_at_state(&cs->at_state);
 846         dealloc_at_states(cs);
 847         free_strings(&cs->at_state);
 848         gigaset_at_init(&cs->at_state, NULL, cs, 0);
 849
 850         kfree(cs->inbuf->rcvbuf);
 851         cs->inbuf->rcvbuf = NULL;
 852         cs->inbuf->inputstate = INS_command;
 853         cs->inbuf->head = 0;
 854         cs->inbuf->tail = 0;
 855
 856         cb = cs->cmdbuf;
 857         while (cb) {
 858                 tcb = cb;
 859                 cb = cb->next;
 860                 kfree(tcb);
 861         }
 862         cs->cmdbuf = cs->lastcmdbuf = NULL;
 863         cs->curlen = 0;
 864         cs->cmdbytes = 0;
 865         cs->gotfwver = -1;
 866         cs->dle = 0;
 867         cs->cur_at_seq = 0;
 868         cs->commands_pending = 0;
 869         cs->cbytes = 0;
 870
 871         spin_unlock_irqrestore(&cs->lock, flags);
 872
 873         for (i = 0; i < cs->channels; ++i) {
 874                 gigaset_freebcs(cs->bcs + i);
 875                 if (!gigaset_initbcs(cs->bcs + i, cs, i))
 876                         pr_err("could not allocate channel %d data\n", i);
 877         }
 878
 879         if (cs->waiting) {
 880                 cs->cmd_result = -ENODEV;
 881                 cs->waiting = 0;
 882                 wake_up_interruptible(&cs->waitqueue);
 883         }
 884 }
 885
 886
 887 /**
 888  * gigaset_start() - start device operations
 889  * @cs:         device descriptor structure.
 890  *
 891  * Prepares the device for use by setting up communication parameters,
 892  * scheduling an EV_START event to initiate device initialization, and
 893  * waiting for completion of the initialization.
 894  *
 895  * Return value:
 896  *      1 - success, 0 - error
 897  */
 898 int gigaset_start(struct cardstate *cs)
 899 {
 900         unsigned long flags;
 901
 902         if (mutex_lock_interruptible(&cs->mutex))
 903                 return 0;
 904
 905         spin_lock_irqsave(&cs->lock, flags);
 906         cs->connected = 1;
 907         spin_unlock_irqrestore(&cs->lock, flags);
 908
 909         if (cs->mstate != MS_LOCKED) {
 910                 cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR|TIOCM_RTS);
 911                 cs->ops->baud_rate(cs, B115200);
 912                 cs->ops->set_line_ctrl(cs, CS8);
 913                 cs->control_state = TIOCM_DTR|TIOCM_RTS;
 914         } else {
 915                 //FIXME use some saved values?
 916         }
 917
 918         cs->waiting = 1;
 919
 920         if (!gigaset_add_event(cs, &cs->at_state, EV_START, NULL, 0, NULL)) {
 921                 cs->waiting = 0;
 922                 //FIXME what should we do?
 923                 goto error;
 924         }
 925
 926         gig_dbg(DEBUG_CMD, "scheduling START");
 927         gigaset_schedule_event(cs);
 928
 929         wait_event(cs->waitqueue, !cs->waiting);
 930
 931         mutex_unlock(&cs->mutex);
 932         return 1;
 933
 934 error:
 935         mutex_unlock(&cs->mutex);
 936         return 0;
 937 }
 938 EXPORT_SYMBOL_GPL(gigaset_start);
 939
 940 /**
 941  * gigaset_shutdown() - shut down device operations
 942  * @cs:         device descriptor structure.
 943  *
 944  * Deactivates the device by scheduling an EV_SHUTDOWN event and
 945  * waiting for completion of the shutdown.
 946  *
 947  * Return value:
 948  *      0 - success, -1 - error (no device associated)
 949  */
 950 int gigaset_shutdown(struct cardstate *cs)
 951 {
 952         mutex_lock(&cs->mutex);
 953
 954         if (!(cs->flags & VALID_MINOR)) {
 955                 mutex_unlock(&cs->mutex);
 956                 return -1;
 957         }
 958
 959         cs->waiting = 1;
 960
 961         if (!gigaset_add_event(cs, &cs->at_state, EV_SHUTDOWN, NULL, 0, NULL)) {
 962                 //FIXME what should we do?
 963                 goto exit;
 964         }
 965
 966         gig_dbg(DEBUG_CMD, "scheduling SHUTDOWN");
 967         gigaset_schedule_event(cs);
 968
 969         wait_event(cs->waitqueue, !cs->waiting);
 970
 971         cleanup_cs(cs);
 972
 973 exit:
 974         mutex_unlock(&cs->mutex);
 975         return 0;
 976 }
 977 EXPORT_SYMBOL_GPL(gigaset_shutdown);
 978
 979 /**
 980  * gigaset_stop() - stop device operations
 981  * @cs:         device descriptor structure.
 982  *
 983  * Stops operations on the device by scheduling an EV_STOP event and
 984  * waiting for completion of the shutdown.
 985  */
 986 void gigaset_stop(struct cardstate *cs)
 987 {
 988         mutex_lock(&cs->mutex);
 989
 990         cs->waiting = 1;
 991
 992         if (!gigaset_add_event(cs, &cs->at_state, EV_STOP, NULL, 0, NULL)) {
 993                 //FIXME what should we do?
 994                 goto exit;
 995         }
 996
 997         gig_dbg(DEBUG_CMD, "scheduling STOP");
 998         gigaset_schedule_event(cs);
 999
1000         wait_event(cs->waitqueue, !cs->waiting);
1001
1002         cleanup_cs(cs);
1003
1004 exit:
1005         mutex_unlock(&cs->mutex);
1006 }
1007 EXPORT_SYMBOL_GPL(gigaset_stop);
1008
1009 static LIST_HEAD(drivers);
1010 static DEFINE_SPINLOCK(driver_lock);
1011
1012 struct cardstate *gigaset_get_cs_by_id(int id)
1013 {
1014         unsigned long flags;
1015         struct cardstate *ret = NULL;
1016         struct cardstate *cs;
1017         struct gigaset_driver *drv;
1018         unsigned i;
1019
1020         spin_lock_irqsave(&driver_lock, flags);
1021         list_for_each_entry(drv, &drivers, list) {
1022                 spin_lock(&drv->lock);
1023                 for (i = 0; i < drv->minors; ++i) {
1024                         cs = drv->cs + i;
1025                         if ((cs->flags & VALID_ID) && cs->myid == id) {
1026                                 ret = cs;
1027                                 break;
1028                         }
1029                 }
1030                 spin_unlock(&drv->lock);
1031                 if (ret)
1032                         break;
1033         }
1034         spin_unlock_irqrestore(&driver_lock, flags);
1035         return ret;
1036 }
1037
1038 void gigaset_debugdrivers(void)
1039 {
1040         unsigned long flags;
1041         static struct cardstate *cs;
1042         struct gigaset_driver *drv;
1043         unsigned i;
1044
1045         spin_lock_irqsave(&driver_lock, flags);
1046         list_for_each_entry(drv, &drivers, list) {
1047                 gig_dbg(DEBUG_DRIVER, "driver %p", drv);
1048                 spin_lock(&drv->lock);
1049                 for (i = 0; i < drv->minors; ++i) {
1050                         gig_dbg(DEBUG_DRIVER, "  index %u", i);
1051                         cs = drv->cs + i;
1052                         gig_dbg(DEBUG_DRIVER, "    cardstate %p", cs);
1053                         gig_dbg(DEBUG_DRIVER, "    flags 0x%02x", cs->flags);
1054                         gig_dbg(DEBUG_DRIVER, "    minor_index %u",
1055                                 cs->minor_index);
1056                         gig_dbg(DEBUG_DRIVER, "    driver %p", cs->driver);
1057                         gig_dbg(DEBUG_DRIVER, "    i4l id %d", cs->myid);
1058                 }
1059                 spin_unlock(&drv->lock);
1060         }
1061         spin_unlock_irqrestore(&driver_lock, flags);
1062 }
1063
1064 static struct cardstate *gigaset_get_cs_by_minor(unsigned minor)
1065 {
1066         unsigned long flags;
1067         struct cardstate *ret = NULL;
1068         struct gigaset_driver *drv;
1069         unsigned index;
1070
1071         spin_lock_irqsave(&driver_lock, flags);
1072         list_for_each_entry(drv, &drivers, list) {
1073                 if (minor < drv->minor || minor >= drv->minor + drv->minors)
1074                         continue;
1075                 index = minor - drv->minor;
1076                 spin_lock(&drv->lock);
1077                 if (drv->cs[index].flags & VALID_MINOR)
1078                         ret = drv->cs + index;
1079                 spin_unlock(&drv->lock);
1080                 if (ret)
1081                         break;
1082         }
1083         spin_unlock_irqrestore(&driver_lock, flags);
1084         return ret;
1085 }
1086
1087 struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty)
1088 {
1089         if (tty->index < 0 || tty->index >= tty->driver->num)
1090                 return NULL;
1091         return gigaset_get_cs_by_minor(tty->index + tty->driver->minor_start);
1092 }
1093
1094 /**
1095  * gigaset_freedriver() - free all associated ressources of a driver
1096  * @drv:        driver descriptor structure.
1097  *
1098  * Unregisters the driver from the system and deallocates the driver
1099  * structure @drv and all structures referenced from it.
1100  * All devices should be shut down before calling this.
1101  */
1102 void gigaset_freedriver(struct gigaset_driver *drv)
1103 {
1104         unsigned long flags;
1105
1106         spin_lock_irqsave(&driver_lock, flags);
1107         list_del(&drv->list);
1108         spin_unlock_irqrestore(&driver_lock, flags);
1109
1110         gigaset_if_freedriver(drv);
1111
1112         kfree(drv->cs);
1113         kfree(drv);
1114 }
1115 EXPORT_SYMBOL_GPL(gigaset_freedriver);
1116
1117 /**
1118  * gigaset_initdriver() - initialize driver structure
1119  * @minor:      First minor number
1120  * @minors:     Number of minors this driver can handle
1121  * @procname:   Name of the driver
1122  * @devname:    Name of the device files (prefix without minor number)
1123  *
1124  * Allocate and initialize gigaset_driver structure. Initialize interface.
1125  *
1126  * Return value:
1127  *      Pointer to the gigaset_driver structure on success, NULL on failure.
1128  */
1129 struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors,
1130                                           const char *procname,
1131                                           const char *devname,
1132                                           const struct gigaset_ops *ops,
1133                                           struct module *owner)
1134 {
1135         struct gigaset_driver *drv;
1136         unsigned long flags;
1137         unsigned i;
1138
1139         drv = kmalloc(sizeof *drv, GFP_KERNEL);
1140         if (!drv)
1141                 return NULL;
1142
1143         drv->have_tty = 0;
1144         drv->minor = minor;
1145         drv->minors = minors;
1146         spin_lock_init(&drv->lock);
1147         drv->blocked = 0;
1148         drv->ops = ops;
1149         drv->owner = owner;
1150         INIT_LIST_HEAD(&drv->list);
1151
1152         drv->cs = kmalloc(minors * sizeof *drv->cs, GFP_KERNEL);
1153         if (!drv->cs)
1154                 goto error;
1155
1156         for (i = 0; i < minors; ++i) {
1157                 drv->cs[i].flags = 0;
1158                 drv->cs[i].driver = drv;
1159                 drv->cs[i].ops = drv->ops;
1160                 drv->cs[i].minor_index = i;
1161                 mutex_init(&drv->cs[i].mutex);
1162         }
1163
1164         gigaset_if_initdriver(drv, procname, devname);
1165
1166         spin_lock_irqsave(&driver_lock, flags);
1167         list_add(&drv->list, &drivers);
1168         spin_unlock_irqrestore(&driver_lock, flags);
1169
1170         return drv;
1171
1172 error:
1173         kfree(drv->cs);
1174         kfree(drv);
1175         return NULL;
1176 }
1177 EXPORT_SYMBOL_GPL(gigaset_initdriver);
1178
1179 /**
1180  * gigaset_blockdriver() - block driver
1181  * @drv:        driver descriptor structure.
1182  *
1183  * Prevents the driver from attaching new devices, in preparation for
1184  * deregistration.
1185  */
1186 void gigaset_blockdriver(struct gigaset_driver *drv)
1187 {
1188         drv->blocked = 1;
1189 }
1190 EXPORT_SYMBOL_GPL(gigaset_blockdriver);
1191
1192 static int __init gigaset_init_module(void)
1193 {
1194         /* in accordance with the principle of least astonishment,
1195          * setting the 'debug' parameter to 1 activates a sensible
1196          * set of default debug levels
1197          */
1198         if (gigaset_debuglevel == 1)
1199                 gigaset_debuglevel = DEBUG_DEFAULT;
1200
1201         pr_info(DRIVER_DESC DRIVER_DESC_DEBUG "\n");
1202         return 0;
1203 }
1204
1205 static void __exit gigaset_exit_module(void)
1206 {
1207 }
1208
1209 module_init(gigaset_init_module);
1210 module_exit(gigaset_exit_module);
1211
1212 MODULE_AUTHOR(DRIVER_AUTHOR);
1213 MODULE_DESCRIPTION(DRIVER_DESC);
1214
1215 MODULE_LICENSE("GPL");