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/module.h>
  18 #include <linux/moduleparam.h>
  19
  20 /* Version Information */
  21 #define DRIVER_AUTHOR "Hansjoerg Lipp <hjlipp@web.de>, Tilman Schmidt <tilman@imap.cc>, Stefan Eilers"
  22 #define DRIVER_DESC "Driver for Gigaset 307x"
  23
  24 #ifdef CONFIG_GIGASET_DEBUG
  25 #define DRIVER_DESC_DEBUG " (debug build)"
  26 #else
  27 #define DRIVER_DESC_DEBUG ""
  28 #endif
  29
  30 /* Module parameters */
  31 int gigaset_debuglevel;
  32 EXPORT_SYMBOL_GPL(gigaset_debuglevel);
  33 module_param_named(debug, gigaset_debuglevel, int, S_IRUGO | S_IWUSR);
  34 MODULE_PARM_DESC(debug, "debug level");
  35
  36 /* driver state flags */
  37 #define VALID_MINOR     0x01
  38 #define VALID_ID        0x02
  39
  40 /**
  41  * gigaset_dbg_buffer() - dump data in ASCII and hex for debugging
  42  * @level:      debugging level.
  43  * @msg:        message prefix.
  44  * @len:        number of bytes to dump.
  45  * @buf:        data to dump.
  46  *
  47  * If the current debugging level includes one of the bits set in @level,
  48  * @len bytes starting at @buf are logged to dmesg at KERN_DEBUG prio,
  49  * prefixed by the text @msg.
  50  */
  51 void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
  52                         size_t len, const unsigned char *buf)
  53 {
  54         unsigned char outbuf[80];
  55         unsigned char c;
  56         size_t space = sizeof outbuf - 1;
  57         unsigned char *out = outbuf;
  58         size_t numin = len;
  59
  60         while (numin--) {
  61                 c = *buf++;
  62                 if (c == '~' || c == '^' || c == '\\') {
  63                         if (!space--)
  64                                 break;
  65                         *out++ = '\\';
  66                 }
  67                 if (c & 0x80) {
  68                         if (!space--)
  69                                 break;
  70                         *out++ = '~';
  71                         c ^= 0x80;
  72                 }
  73                 if (c < 0x20 || c == 0x7f) {
  74                         if (!space--)
  75                                 break;
  76                         *out++ = '^';
  77                         c ^= 0x40;
  78                 }
  79                 if (!space--)
  80                         break;
  81                 *out++ = c;
  82         }
  83         *out = 0;
  84
  85         gig_dbg(level, "%s (%u bytes): %s", msg, (unsigned) len, outbuf);
  86 }
  87 EXPORT_SYMBOL_GPL(gigaset_dbg_buffer);
  88
  89 static int setflags(struct cardstate *cs, unsigned flags, unsigned delay)
  90 {
  91         int r;
  92
  93         r = cs->ops->set_modem_ctrl(cs, cs->control_state, flags);
  94         cs->control_state = flags;
  95         if (r < 0)
  96                 return r;
  97
  98         if (delay) {
  99                 set_current_state(TASK_INTERRUPTIBLE);
 100                 schedule_timeout(delay * HZ / 1000);
 101         }
 102
 103         return 0;
 104 }
 105
 106 int gigaset_enterconfigmode(struct cardstate *cs)
 107 {
 108         int i, r;
 109
 110         cs->control_state = TIOCM_RTS;
 111
 112         r = setflags(cs, TIOCM_DTR, 200);
 113         if (r < 0)
 114                 goto error;
 115         r = setflags(cs, 0, 200);
 116         if (r < 0)
 117                 goto error;
 118         for (i = 0; i < 5; ++i) {
 119                 r = setflags(cs, TIOCM_RTS, 100);
 120                 if (r < 0)
 121                         goto error;
 122                 r = setflags(cs, 0, 100);
 123                 if (r < 0)
 124                         goto error;
 125         }
 126         r = setflags(cs, TIOCM_RTS | TIOCM_DTR, 800);
 127         if (r < 0)
 128                 goto error;
 129
 130         return 0;
 131
 132 error:
 133         dev_err(cs->dev, "error %d on setuartbits\n", -r);
 134         cs->control_state = TIOCM_RTS | TIOCM_DTR;
 135         cs->ops->set_modem_ctrl(cs, 0, TIOCM_RTS | TIOCM_DTR);
 136
 137         return -1;
 138 }
 139
 140 static int test_timeout(struct at_state_t *at_state)
 141 {
 142         if (!at_state->timer_expires)
 143                 return 0;
 144
 145         if (--at_state->timer_expires) {
 146                 gig_dbg(DEBUG_MCMD, "decreased timer of %p to %lu",
 147                         at_state, at_state->timer_expires);
 148                 return 0;
 149         }
 150
 151         gigaset_add_event(at_state->cs, at_state, EV_TIMEOUT, NULL,
 152                           at_state->timer_index, NULL);
 153         return 1;
 154 }
 155
 156 static void timer_tick(unsigned long data)
 157 {
 158         struct cardstate *cs = (struct cardstate *) data;
 159         unsigned long flags;
 160         unsigned channel;
 161         struct at_state_t *at_state;
 162         int timeout = 0;
 163
 164         spin_lock_irqsave(&cs->lock, flags);
 165
 166         for (channel = 0; channel < cs->channels; ++channel)
 167                 if (test_timeout(&cs->bcs[channel].at_state))
 168                         timeout = 1;
 169
 170         if (test_timeout(&cs->at_state))
 171                 timeout = 1;
 172
 173         list_for_each_entry(at_state, &cs->temp_at_states, list)
 174                 if (test_timeout(at_state))
 175                         timeout = 1;
 176
 177         if (cs->running) {
 178                 mod_timer(&cs->timer, jiffies + msecs_to_jiffies(GIG_TICK));
 179                 if (timeout) {
 180                         gig_dbg(DEBUG_EVENT, "scheduling timeout");
 181                         tasklet_schedule(&cs->event_tasklet);
 182                 }
 183         }
 184
 185         spin_unlock_irqrestore(&cs->lock, flags);
 186 }
 187
 188 int gigaset_get_channel(struct bc_state *bcs)
 189 {
 190         unsigned long flags;
 191
 192         spin_lock_irqsave(&bcs->cs->lock, flags);
 193         if (bcs->use_count || !try_module_get(bcs->cs->driver->owner)) {
 194                 gig_dbg(DEBUG_CHANNEL, "could not allocate channel %d",
 195                         bcs->channel);
 196                 spin_unlock_irqrestore(&bcs->cs->lock, flags);
 197                 return -EBUSY;
 198         }
 199         ++bcs->use_count;
 200         bcs->busy = 1;
 201         gig_dbg(DEBUG_CHANNEL, "allocated channel %d", bcs->channel);
 202         spin_unlock_irqrestore(&bcs->cs->lock, flags);
 203         return 0;
 204 }
 205
 206 struct bc_state *gigaset_get_free_channel(struct cardstate *cs)
 207 {
 208         unsigned long flags;
 209         int i;
 210
 211         spin_lock_irqsave(&cs->lock, flags);
 212         if (!try_module_get(cs->driver->owner)) {
 213                 gig_dbg(DEBUG_CHANNEL,
 214                         "could not get module for allocating channel");
 215                 spin_unlock_irqrestore(&cs->lock, flags);
 216                 return NULL;
 217         }
 218         for (i = 0; i < cs->channels; ++i)
 219                 if (!cs->bcs[i].use_count) {
 220                         ++cs->bcs[i].use_count;
 221                         cs->bcs[i].busy = 1;
 222                         spin_unlock_irqrestore(&cs->lock, flags);
 223                         gig_dbg(DEBUG_CHANNEL, "allocated channel %d", i);
 224                         return cs->bcs + i;
 225                 }
 226         module_put(cs->driver->owner);
 227         spin_unlock_irqrestore(&cs->lock, flags);
 228         gig_dbg(DEBUG_CHANNEL, "no free channel");
 229         return NULL;
 230 }
 231
 232 void gigaset_free_channel(struct bc_state *bcs)
 233 {
 234         unsigned long flags;
 235
 236         spin_lock_irqsave(&bcs->cs->lock, flags);
 237         if (!bcs->busy) {
 238                 gig_dbg(DEBUG_CHANNEL, "could not free channel %d",
 239                         bcs->channel);
 240                 spin_unlock_irqrestore(&bcs->cs->lock, flags);
 241                 return;
 242         }
 243         --bcs->use_count;
 244         bcs->busy = 0;
 245         module_put(bcs->cs->driver->owner);
 246         gig_dbg(DEBUG_CHANNEL, "freed channel %d", bcs->channel);
 247         spin_unlock_irqrestore(&bcs->cs->lock, flags);
 248 }
 249
 250 int gigaset_get_channels(struct cardstate *cs)
 251 {
 252         unsigned long flags;
 253         int i;
 254
 255         spin_lock_irqsave(&cs->lock, flags);
 256         for (i = 0; i < cs->channels; ++i)
 257                 if (cs->bcs[i].use_count) {
 258                         spin_unlock_irqrestore(&cs->lock, flags);
 259                         gig_dbg(DEBUG_CHANNEL,
 260                                 "could not allocate all channels");
 261                         return -EBUSY;
 262                 }
 263         for (i = 0; i < cs->channels; ++i)
 264                 ++cs->bcs[i].use_count;
 265         spin_unlock_irqrestore(&cs->lock, flags);
 266
 267         gig_dbg(DEBUG_CHANNEL, "allocated all channels");
 268
 269         return 0;
 270 }
 271
 272 void gigaset_free_channels(struct cardstate *cs)
 273 {
 274         unsigned long flags;
 275         int i;
 276
 277         gig_dbg(DEBUG_CHANNEL, "unblocking all channels");
 278         spin_lock_irqsave(&cs->lock, flags);
 279         for (i = 0; i < cs->channels; ++i)
 280                 --cs->bcs[i].use_count;
 281         spin_unlock_irqrestore(&cs->lock, flags);
 282 }
 283
 284 void gigaset_block_channels(struct cardstate *cs)
 285 {
 286         unsigned long flags;
 287         int i;
 288
 289         gig_dbg(DEBUG_CHANNEL, "blocking all channels");
 290         spin_lock_irqsave(&cs->lock, flags);
 291         for (i = 0; i < cs->channels; ++i)
 292                 ++cs->bcs[i].use_count;
 293         spin_unlock_irqrestore(&cs->lock, flags);
 294 }
 295
 296 static void clear_events(struct cardstate *cs)
 297 {
 298         struct event_t *ev;
 299         unsigned head, tail;
 300         unsigned long flags;
 301
 302         spin_lock_irqsave(&cs->ev_lock, flags);
 303
 304         head = cs->ev_head;
 305         tail = cs->ev_tail;
 306
 307         while (tail != head) {
 308                 ev = cs->events + head;
 309                 kfree(ev->ptr);
 310                 head = (head + 1) % MAX_EVENTS;
 311         }
 312
 313         cs->ev_head = tail;
 314
 315         spin_unlock_irqrestore(&cs->ev_lock, flags);
 316 }
 317
 318 /**
 319  * gigaset_add_event() - add event to device event queue
 320  * @cs:         device descriptor structure.
 321  * @at_state:   connection state structure.
 322  * @type:       event type.
 323  * @ptr:        pointer parameter for event.
 324  * @parameter:  integer parameter for event.
 325  * @arg:        pointer parameter for event.
 326  *
 327  * Allocate an event queue entry from the device's event queue, and set it up
 328  * with the parameters given.
 329  *
 330  * Return value: added event
 331  */
 332 struct event_t *gigaset_add_event(struct cardstate *cs,
 333                                   struct at_state_t *at_state, int type,
 334                                   void *ptr, int parameter, void *arg)
 335 {
 336         unsigned long flags;
 337         unsigned next, tail;
 338         struct event_t *event = NULL;
 339
 340         gig_dbg(DEBUG_EVENT, "queueing event %d", type);
 341
 342         spin_lock_irqsave(&cs->ev_lock, flags);
 343
 344         tail = cs->ev_tail;
 345         next = (tail + 1) % MAX_EVENTS;
 346         if (unlikely(next == cs->ev_head))
 347                 dev_err(cs->dev, "event queue full\n");
 348         else {
 349                 event = cs->events + tail;
 350                 event->type = type;
 351                 event->at_state = at_state;
 352                 event->cid = -1;
 353                 event->ptr = ptr;
 354                 event->arg = arg;
 355                 event->parameter = parameter;
 356                 cs->ev_tail = next;
 357         }
 358
 359         spin_unlock_irqrestore(&cs->ev_lock, flags);
 360
 361         return event;
 362 }
 363 EXPORT_SYMBOL_GPL(gigaset_add_event);
 364
 365 static void clear_at_state(struct at_state_t *at_state)
 366 {
 367         int i;
 368
 369         for (i = 0; i < STR_NUM; ++i) {
 370                 kfree(at_state->str_var[i]);
 371                 at_state->str_var[i] = NULL;
 372         }
 373 }
 374
 375 static void dealloc_temp_at_states(struct cardstate *cs)
 376 {
 377         struct at_state_t *cur, *next;
 378
 379         list_for_each_entry_safe(cur, next, &cs->temp_at_states, list) {
 380                 list_del(&cur->list);
 381                 clear_at_state(cur);
 382                 kfree(cur);
 383         }
 384 }
 385
 386 static void gigaset_freebcs(struct bc_state *bcs)
 387 {
 388         int i;
 389
 390         gig_dbg(DEBUG_INIT, "freeing bcs[%d]->hw", bcs->channel);
 391         bcs->cs->ops->freebcshw(bcs);
 392
 393         gig_dbg(DEBUG_INIT, "clearing bcs[%d]->at_state", bcs->channel);
 394         clear_at_state(&bcs->at_state);
 395         gig_dbg(DEBUG_INIT, "freeing bcs[%d]->skb", bcs->channel);
 396         dev_kfree_skb(bcs->rx_skb);
 397         bcs->rx_skb = NULL;
 398
 399         for (i = 0; i < AT_NUM; ++i) {
 400                 kfree(bcs->commands[i]);
 401                 bcs->commands[i] = NULL;
 402         }
 403 }
 404
 405 static struct cardstate *alloc_cs(struct gigaset_driver *drv)
 406 {
 407         unsigned long flags;
 408         unsigned i;
 409         struct cardstate *cs;
 410         struct cardstate *ret = NULL;
 411
 412         spin_lock_irqsave(&drv->lock, flags);
 413         if (drv->blocked)
 414                 goto exit;
 415         for (i = 0; i < drv->minors; ++i) {
 416                 cs = drv->cs + i;
 417                 if (!(cs->flags & VALID_MINOR)) {
 418                         cs->flags = VALID_MINOR;
 419                         ret = cs;
 420                         break;
 421                 }
 422         }
 423 exit:
 424         spin_unlock_irqrestore(&drv->lock, flags);
 425         return ret;
 426 }
 427
 428 static void free_cs(struct cardstate *cs)
 429 {
 430         cs->flags = 0;
 431 }
 432
 433 static void make_valid(struct cardstate *cs, unsigned mask)
 434 {
 435         unsigned long flags;
 436         struct gigaset_driver *drv = cs->driver;
 437         spin_lock_irqsave(&drv->lock, flags);
 438         cs->flags |= mask;
 439         spin_unlock_irqrestore(&drv->lock, flags);
 440 }
 441
 442 static void make_invalid(struct cardstate *cs, unsigned mask)
 443 {
 444         unsigned long flags;
 445         struct gigaset_driver *drv = cs->driver;
 446         spin_lock_irqsave(&drv->lock, flags);
 447         cs->flags &= ~mask;
 448         spin_unlock_irqrestore(&drv->lock, flags);
 449 }
 450
 451 /**
 452  * gigaset_freecs() - free all associated ressources of a device
 453  * @cs:         device descriptor structure.
 454  *
 455  * Stops all tasklets and timers, unregisters the device from all
 456  * subsystems it was registered to, deallocates the device structure
 457  * @cs and all structures referenced from it.
 458  * Operations on the device should be stopped before calling this.
 459  */
 460 void gigaset_freecs(struct cardstate *cs)
 461 {
 462         int i;
 463         unsigned long flags;
 464
 465         if (!cs)
 466                 return;
 467
 468         mutex_lock(&cs->mutex);
 469
 470         if (!cs->bcs)
 471                 goto f_cs;
 472         if (!cs->inbuf)
 473                 goto f_bcs;
 474
 475         spin_lock_irqsave(&cs->lock, flags);
 476         cs->running = 0;
 477         spin_unlock_irqrestore(&cs->lock, flags); /* event handler and timer are
 478                                                      not rescheduled below */
 479
 480         tasklet_kill(&cs->event_tasklet);
 481         del_timer_sync(&cs->timer);
 482
 483         switch (cs->cs_init) {
 484         default:
 485                 /* clear B channel structures */
 486                 for (i = 0; i < cs->channels; ++i) {
 487                         gig_dbg(DEBUG_INIT, "clearing bcs[%d]", i);
 488                         gigaset_freebcs(cs->bcs + i);
 489                 }
 490
 491                 /* clear device sysfs */
 492                 gigaset_free_dev_sysfs(cs);
 493
 494                 gigaset_if_free(cs);
 495
 496                 gig_dbg(DEBUG_INIT, "clearing hw");
 497                 cs->ops->freecshw(cs);
 498
 499                 /* fall through */
 500         case 2: /* error in initcshw */
 501                 /* Deregister from LL */
 502                 make_invalid(cs, VALID_ID);
 503                 gigaset_isdn_unregdev(cs);
 504
 505                 /* fall through */
 506         case 1: /* error when registering to LL */
 507                 gig_dbg(DEBUG_INIT, "clearing at_state");
 508                 clear_at_state(&cs->at_state);
 509                 dealloc_temp_at_states(cs);
 510
 511                 /* fall through */
 512         case 0: /* error in basic setup */
 513                 clear_events(cs);
 514                 gig_dbg(DEBUG_INIT, "freeing inbuf");
 515                 kfree(cs->inbuf);
 516         }
 517 f_bcs:  gig_dbg(DEBUG_INIT, "freeing bcs[]");
 518         kfree(cs->bcs);
 519 f_cs:   gig_dbg(DEBUG_INIT, "freeing cs");
 520         mutex_unlock(&cs->mutex);
 521         free_cs(cs);
 522 }
 523 EXPORT_SYMBOL_GPL(gigaset_freecs);
 524
 525 void gigaset_at_init(struct at_state_t *at_state, struct bc_state *bcs,
 526                      struct cardstate *cs, int cid)
 527 {
 528         int i;
 529
 530         INIT_LIST_HEAD(&at_state->list);
 531         at_state->waiting = 0;
 532         at_state->getstring = 0;
 533         at_state->pending_commands = 0;
 534         at_state->timer_expires = 0;
 535         at_state->timer_active = 0;
 536         at_state->timer_index = 0;
 537         at_state->seq_index = 0;
 538         at_state->ConState = 0;
 539         for (i = 0; i < STR_NUM; ++i)
 540                 at_state->str_var[i] = NULL;
 541         at_state->int_var[VAR_ZDLE] = 0;
 542         at_state->int_var[VAR_ZCTP] = -1;
 543         at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
 544         at_state->cs = cs;
 545         at_state->bcs = bcs;
 546         at_state->cid = cid;
 547         if (!cid)
 548                 at_state->replystruct = cs->tabnocid;
 549         else
 550                 at_state->replystruct = cs->tabcid;
 551 }
 552
 553
 554 static void gigaset_inbuf_init(struct inbuf_t *inbuf, struct cardstate *cs)
 555 /* inbuf->read must be allocated before! */
 556 {
 557         inbuf->head = 0;
 558         inbuf->tail = 0;
 559         inbuf->cs = cs;
 560         inbuf->inputstate = INS_command;
 561 }
 562
 563 /**
 564  * gigaset_fill_inbuf() - append received data to input buffer
 565  * @inbuf:      buffer structure.
 566  * @src:        received data.
 567  * @numbytes:   number of bytes received.
 568  *
 569  * Return value: !=0 if some data was appended
 570  */
 571 int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src,
 572                        unsigned numbytes)
 573 {
 574         unsigned n, head, tail, bytesleft;
 575
 576         gig_dbg(DEBUG_INTR, "received %u bytes", numbytes);
 577
 578         if (!numbytes)
 579                 return 0;
 580
 581         bytesleft = numbytes;
 582         tail = inbuf->tail;
 583         head = inbuf->head;
 584         gig_dbg(DEBUG_INTR, "buffer state: %u -> %u", head, tail);
 585
 586         while (bytesleft) {
 587                 if (head > tail)
 588                         n = head - 1 - tail;
 589                 else if (head == 0)
 590                         n = (RBUFSIZE - 1) - tail;
 591                 else
 592                         n = RBUFSIZE - tail;
 593                 if (!n) {
 594                         dev_err(inbuf->cs->dev,
 595                                 "buffer overflow (%u bytes lost)\n",
 596                                 bytesleft);
 597                         break;
 598                 }
 599                 if (n > bytesleft)
 600                         n = bytesleft;
 601                 memcpy(inbuf->data + tail, src, n);
 602                 bytesleft -= n;
 603                 tail = (tail + n) % RBUFSIZE;
 604                 src += n;
 605         }
 606         gig_dbg(DEBUG_INTR, "setting tail to %u", tail);
 607         inbuf->tail = tail;
 608         return numbytes != bytesleft;
 609 }
 610 EXPORT_SYMBOL_GPL(gigaset_fill_inbuf);
 611
 612 /* Initialize the b-channel structure */
 613 static int gigaset_initbcs(struct bc_state *bcs, struct cardstate *cs,
 614                            int channel)
 615 {
 616         int i;
 617
 618         bcs->tx_skb = NULL;
 619
 620         skb_queue_head_init(&bcs->squeue);
 621
 622         bcs->corrupted = 0;
 623         bcs->trans_down = 0;
 624         bcs->trans_up = 0;
 625
 626         gig_dbg(DEBUG_INIT, "setting up bcs[%d]->at_state", channel);
 627         gigaset_at_init(&bcs->at_state, bcs, cs, -1);
 628
 629 #ifdef CONFIG_GIGASET_DEBUG
 630         bcs->emptycount = 0;
 631 #endif
 632
 633         bcs->rx_bufsize = 0;
 634         bcs->rx_skb = NULL;
 635         bcs->rx_fcs = PPP_INITFCS;
 636         bcs->inputstate = 0;
 637         bcs->channel = channel;
 638         bcs->cs = cs;
 639
 640         bcs->chstate = 0;
 641         bcs->use_count = 1;
 642         bcs->busy = 0;
 643         bcs->ignore = cs->ignoreframes;
 644
 645         for (i = 0; i < AT_NUM; ++i)
 646                 bcs->commands[i] = NULL;
 647
 648         spin_lock_init(&bcs->aplock);
 649         bcs->ap = NULL;
 650         bcs->apconnstate = 0;
 651
 652         gig_dbg(DEBUG_INIT, "  setting up bcs[%d]->hw", channel);
 653         return cs->ops->initbcshw(bcs);
 654 }
 655
 656 /**
 657  * gigaset_initcs() - initialize device structure
 658  * @drv:        hardware driver the device belongs to
 659  * @channels:   number of B channels supported by device
 660  * @onechannel: !=0 if B channel data and AT commands share one
 661  *                  communication channel (M10x),
 662  *              ==0 if B channels have separate communication channels (base)
 663  * @ignoreframes:       number of frames to ignore after setting up B channel
 664  * @cidmode:    !=0: start in CallID mode
 665  * @modulename: name of driver module for LL registration
 666  *
 667  * Allocate and initialize cardstate structure for Gigaset driver
 668  * Calls hardware dependent gigaset_initcshw() function
 669  * Calls B channel initialization function gigaset_initbcs() for each B channel
 670  *
 671  * Return value:
 672  *      pointer to cardstate structure
 673  */
 674 struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels,
 675                                  int onechannel, int ignoreframes,
 676                                  int cidmode, const char *modulename)
 677 {
 678         struct cardstate *cs;
 679         unsigned long flags;
 680         int i;
 681
 682         gig_dbg(DEBUG_INIT, "allocating cs");
 683         cs = alloc_cs(drv);
 684         if (!cs) {
 685                 pr_err("maximum number of devices exceeded\n");
 686                 return NULL;
 687         }
 688
 689         gig_dbg(DEBUG_INIT, "allocating bcs[0..%d]", channels - 1);
 690         cs->bcs = kmalloc(channels * sizeof(struct bc_state), GFP_KERNEL);
 691         if (!cs->bcs) {
 692                 pr_err("out of memory\n");
 693                 goto error;
 694         }
 695         gig_dbg(DEBUG_INIT, "allocating inbuf");
 696         cs->inbuf = kmalloc(sizeof(struct inbuf_t), GFP_KERNEL);
 697         if (!cs->inbuf) {
 698                 pr_err("out of memory\n");
 699                 goto error;
 700         }
 701
 702         cs->cs_init = 0;
 703         cs->channels = channels;
 704         cs->onechannel = onechannel;
 705         cs->ignoreframes = ignoreframes;
 706         INIT_LIST_HEAD(&cs->temp_at_states);
 707         cs->running = 0;
 708         init_timer(&cs->timer); /* clear next & prev */
 709         spin_lock_init(&cs->ev_lock);
 710         cs->ev_tail = 0;
 711         cs->ev_head = 0;
 712
 713         tasklet_init(&cs->event_tasklet, gigaset_handle_event,
 714                      (unsigned long) cs);
 715         tty_port_init(&cs->port);
 716         cs->commands_pending = 0;
 717         cs->cur_at_seq = 0;
 718         cs->gotfwver = -1;
 719         cs->dev = NULL;
 720         cs->tty_dev = NULL;
 721         cs->cidmode = cidmode != 0;
 722         cs->tabnocid = gigaset_tab_nocid;
 723         cs->tabcid = gigaset_tab_cid;
 724
 725         init_waitqueue_head(&cs->waitqueue);
 726         cs->waiting = 0;
 727
 728         cs->mode = M_UNKNOWN;
 729         cs->mstate = MS_UNINITIALIZED;
 730
 731         ++cs->cs_init;
 732
 733         gig_dbg(DEBUG_INIT, "setting up at_state");
 734         spin_lock_init(&cs->lock);
 735         gigaset_at_init(&cs->at_state, NULL, cs, 0);
 736         cs->dle = 0;
 737         cs->cbytes = 0;
 738
 739         gig_dbg(DEBUG_INIT, "setting up inbuf");
 740         gigaset_inbuf_init(cs->inbuf, cs);
 741
 742         cs->connected = 0;
 743         cs->isdn_up = 0;
 744
 745         gig_dbg(DEBUG_INIT, "setting up cmdbuf");
 746         cs->cmdbuf = cs->lastcmdbuf = NULL;
 747         spin_lock_init(&cs->cmdlock);
 748         cs->curlen = 0;
 749         cs->cmdbytes = 0;
 750
 751         gig_dbg(DEBUG_INIT, "setting up iif");
 752         if (gigaset_isdn_regdev(cs, modulename) < 0) {
 753                 pr_err("error registering ISDN device\n");
 754                 goto error;
 755         }
 756
 757         make_valid(cs, VALID_ID);
 758         ++cs->cs_init;
 759         gig_dbg(DEBUG_INIT, "setting up hw");
 760         if (cs->ops->initcshw(cs) < 0)
 761                 goto error;
 762
 763         ++cs->cs_init;
 764
 765         /* set up character device */
 766         gigaset_if_init(cs);
 767
 768         /* set up device sysfs */
 769         gigaset_init_dev_sysfs(cs);
 770
 771         /* set up channel data structures */
 772         for (i = 0; i < channels; ++i) {
 773                 gig_dbg(DEBUG_INIT, "setting up bcs[%d]", i);
 774                 if (gigaset_initbcs(cs->bcs + i, cs, i) < 0) {
 775                         pr_err("could not allocate channel %d data\n", i);
 776                         goto error;
 777                 }
 778         }
 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         add_timer(&cs->timer);
 786
 787         gig_dbg(DEBUG_INIT, "cs initialized");
 788         return cs;
 789
 790 error:
 791         gig_dbg(DEBUG_INIT, "failed");
 792         gigaset_freecs(cs);
 793         return NULL;
 794 }
 795 EXPORT_SYMBOL_GPL(gigaset_initcs);
 796
 797 /* ReInitialize the b-channel structure on hangup */
 798 void gigaset_bcs_reinit(struct bc_state *bcs)
 799 {
 800         struct sk_buff *skb;
 801         struct cardstate *cs = bcs->cs;
 802         unsigned long flags;
 803
 804         while ((skb = skb_dequeue(&bcs->squeue)) != NULL)
 805                 dev_kfree_skb(skb);
 806
 807         spin_lock_irqsave(&cs->lock, flags);
 808         clear_at_state(&bcs->at_state);
 809         bcs->at_state.ConState = 0;
 810         bcs->at_state.timer_active = 0;
 811         bcs->at_state.timer_expires = 0;
 812         bcs->at_state.cid = -1;                 /* No CID defined */
 813         spin_unlock_irqrestore(&cs->lock, flags);
 814
 815         bcs->inputstate = 0;
 816
 817 #ifdef CONFIG_GIGASET_DEBUG
 818         bcs->emptycount = 0;
 819 #endif
 820
 821         bcs->rx_fcs = PPP_INITFCS;
 822         bcs->chstate = 0;
 823
 824         bcs->ignore = cs->ignoreframes;
 825         dev_kfree_skb(bcs->rx_skb);
 826         bcs->rx_skb = NULL;
 827
 828         cs->ops->reinitbcshw(bcs);
 829 }
 830
 831 static void cleanup_cs(struct cardstate *cs)
 832 {
 833         struct cmdbuf_t *cb, *tcb;
 834         int i;
 835         unsigned long flags;
 836
 837         spin_lock_irqsave(&cs->lock, flags);
 838
 839         cs->mode = M_UNKNOWN;
 840         cs->mstate = MS_UNINITIALIZED;
 841
 842         clear_at_state(&cs->at_state);
 843         dealloc_temp_at_states(cs);
 844         gigaset_at_init(&cs->at_state, NULL, cs, 0);
 845
 846         cs->inbuf->inputstate = INS_command;
 847         cs->inbuf->head = 0;
 848         cs->inbuf->tail = 0;
 849
 850         cb = cs->cmdbuf;
 851         while (cb) {
 852                 tcb = cb;
 853                 cb = cb->next;
 854                 kfree(tcb);
 855         }
 856         cs->cmdbuf = cs->lastcmdbuf = NULL;
 857         cs->curlen = 0;
 858         cs->cmdbytes = 0;
 859         cs->gotfwver = -1;
 860         cs->dle = 0;
 861         cs->cur_at_seq = 0;
 862         cs->commands_pending = 0;
 863         cs->cbytes = 0;
 864
 865         spin_unlock_irqrestore(&cs->lock, flags);
 866
 867         for (i = 0; i < cs->channels; ++i) {
 868                 gigaset_freebcs(cs->bcs + i);
 869                 if (gigaset_initbcs(cs->bcs + i, cs, i) < 0)
 870                         pr_err("could not allocate channel %d data\n", i);
 871         }
 872
 873         if (cs->waiting) {
 874                 cs->cmd_result = -ENODEV;
 875                 cs->waiting = 0;
 876                 wake_up_interruptible(&cs->waitqueue);
 877         }
 878 }
 879
 880
 881 /**
 882  * gigaset_start() - start device operations
 883  * @cs:         device descriptor structure.
 884  *
 885  * Prepares the device for use by setting up communication parameters,
 886  * scheduling an EV_START event to initiate device initialization, and
 887  * waiting for completion of the initialization.
 888  *
 889  * Return value:
 890  *      0 on success, error code < 0 on failure
 891  */
 892 int gigaset_start(struct cardstate *cs)
 893 {
 894         unsigned long flags;
 895
 896         if (mutex_lock_interruptible(&cs->mutex))
 897                 return -EBUSY;
 898
 899         spin_lock_irqsave(&cs->lock, flags);
 900         cs->connected = 1;
 901         spin_unlock_irqrestore(&cs->lock, flags);
 902
 903         if (cs->mstate != MS_LOCKED) {
 904                 cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR | TIOCM_RTS);
 905                 cs->ops->baud_rate(cs, B115200);
 906                 cs->ops->set_line_ctrl(cs, CS8);
 907                 cs->control_state = TIOCM_DTR | TIOCM_RTS;
 908         }
 909
 910         cs->waiting = 1;
 911
 912         if (!gigaset_add_event(cs, &cs->at_state, EV_START, NULL, 0, NULL)) {
 913                 cs->waiting = 0;
 914                 goto error;
 915         }
 916         gigaset_schedule_event(cs);
 917
 918         wait_event(cs->waitqueue, !cs->waiting);
 919
 920         mutex_unlock(&cs->mutex);
 921         return 0;
 922
 923 error:
 924         mutex_unlock(&cs->mutex);
 925         return -ENOMEM;
 926 }
 927 EXPORT_SYMBOL_GPL(gigaset_start);
 928
 929 /**
 930  * gigaset_shutdown() - shut down device operations
 931  * @cs:         device descriptor structure.
 932  *
 933  * Deactivates the device by scheduling an EV_SHUTDOWN event and
 934  * waiting for completion of the shutdown.
 935  *
 936  * Return value:
 937  *      0 - success, -ENODEV - error (no device associated)
 938  */
 939 int gigaset_shutdown(struct cardstate *cs)
 940 {
 941         mutex_lock(&cs->mutex);
 942
 943         if (!(cs->flags & VALID_MINOR)) {
 944                 mutex_unlock(&cs->mutex);
 945                 return -ENODEV;
 946         }
 947
 948         cs->waiting = 1;
 949
 950         if (!gigaset_add_event(cs, &cs->at_state, EV_SHUTDOWN, NULL, 0, NULL))
 951                 goto exit;
 952         gigaset_schedule_event(cs);
 953
 954         wait_event(cs->waitqueue, !cs->waiting);
 955
 956         cleanup_cs(cs);
 957
 958 exit:
 959         mutex_unlock(&cs->mutex);
 960         return 0;
 961 }
 962 EXPORT_SYMBOL_GPL(gigaset_shutdown);
 963
 964 /**
 965  * gigaset_stop() - stop device operations
 966  * @cs:         device descriptor structure.
 967  *
 968  * Stops operations on the device by scheduling an EV_STOP event and
 969  * waiting for completion of the shutdown.
 970  */
 971 void gigaset_stop(struct cardstate *cs)
 972 {
 973         mutex_lock(&cs->mutex);
 974
 975         cs->waiting = 1;
 976
 977         if (!gigaset_add_event(cs, &cs->at_state, EV_STOP, NULL, 0, NULL))
 978                 goto exit;
 979         gigaset_schedule_event(cs);
 980
 981         wait_event(cs->waitqueue, !cs->waiting);
 982
 983         cleanup_cs(cs);
 984
 985 exit:
 986         mutex_unlock(&cs->mutex);
 987 }
 988 EXPORT_SYMBOL_GPL(gigaset_stop);
 989
 990 static LIST_HEAD(drivers);
 991 static DEFINE_SPINLOCK(driver_lock);
 992
 993 struct cardstate *gigaset_get_cs_by_id(int id)
 994 {
 995         unsigned long flags;
 996         struct cardstate *ret = NULL;
 997         struct cardstate *cs;
 998         struct gigaset_driver *drv;
 999         unsigned i;
1000
1001         spin_lock_irqsave(&driver_lock, flags);
1002         list_for_each_entry(drv, &drivers, list) {
1003                 spin_lock(&drv->lock);
1004                 for (i = 0; i < drv->minors; ++i) {
1005                         cs = drv->cs + i;
1006                         if ((cs->flags & VALID_ID) && cs->myid == id) {
1007                                 ret = cs;
1008                                 break;
1009                         }
1010                 }
1011                 spin_unlock(&drv->lock);
1012                 if (ret)
1013                         break;
1014         }
1015         spin_unlock_irqrestore(&driver_lock, flags);
1016         return ret;
1017 }
1018
1019 static struct cardstate *gigaset_get_cs_by_minor(unsigned minor)
1020 {
1021         unsigned long flags;
1022         struct cardstate *ret = NULL;
1023         struct gigaset_driver *drv;
1024         unsigned index;
1025
1026         spin_lock_irqsave(&driver_lock, flags);
1027         list_for_each_entry(drv, &drivers, list) {
1028                 if (minor < drv->minor || minor >= drv->minor + drv->minors)
1029                         continue;
1030                 index = minor - drv->minor;
1031                 spin_lock(&drv->lock);
1032                 if (drv->cs[index].flags & VALID_MINOR)
1033                         ret = drv->cs + index;
1034                 spin_unlock(&drv->lock);
1035                 if (ret)
1036                         break;
1037         }
1038         spin_unlock_irqrestore(&driver_lock, flags);
1039         return ret;
1040 }
1041
1042 struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty)
1043 {
1044         return gigaset_get_cs_by_minor(tty->index + tty->driver->minor_start);
1045 }
1046
1047 /**
1048  * gigaset_freedriver() - free all associated ressources of a driver
1049  * @drv:        driver descriptor structure.
1050  *
1051  * Unregisters the driver from the system and deallocates the driver
1052  * structure @drv and all structures referenced from it.
1053  * All devices should be shut down before calling this.
1054  */
1055 void gigaset_freedriver(struct gigaset_driver *drv)
1056 {
1057         unsigned long flags;
1058
1059         spin_lock_irqsave(&driver_lock, flags);
1060         list_del(&drv->list);
1061         spin_unlock_irqrestore(&driver_lock, flags);
1062
1063         gigaset_if_freedriver(drv);
1064
1065         kfree(drv->cs);
1066         kfree(drv);
1067 }
1068 EXPORT_SYMBOL_GPL(gigaset_freedriver);
1069
1070 /**
1071  * gigaset_initdriver() - initialize driver structure
1072  * @minor:      First minor number
1073  * @minors:     Number of minors this driver can handle
1074  * @procname:   Name of the driver
1075  * @devname:    Name of the device files (prefix without minor number)
1076  *
1077  * Allocate and initialize gigaset_driver structure. Initialize interface.
1078  *
1079  * Return value:
1080  *      Pointer to the gigaset_driver structure on success, NULL on failure.
1081  */
1082 struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors,
1083                                           const char *procname,
1084                                           const char *devname,
1085                                           const struct gigaset_ops *ops,
1086                                           struct module *owner)
1087 {
1088         struct gigaset_driver *drv;
1089         unsigned long flags;
1090         unsigned i;
1091
1092         drv = kmalloc(sizeof *drv, GFP_KERNEL);
1093         if (!drv)
1094                 return NULL;
1095
1096         drv->have_tty = 0;
1097         drv->minor = minor;
1098         drv->minors = minors;
1099         spin_lock_init(&drv->lock);
1100         drv->blocked = 0;
1101         drv->ops = ops;
1102         drv->owner = owner;
1103         INIT_LIST_HEAD(&drv->list);
1104
1105         drv->cs = kmalloc(minors * sizeof *drv->cs, GFP_KERNEL);
1106         if (!drv->cs)
1107                 goto error;
1108
1109         for (i = 0; i < minors; ++i) {
1110                 drv->cs[i].flags = 0;
1111                 drv->cs[i].driver = drv;
1112                 drv->cs[i].ops = drv->ops;
1113                 drv->cs[i].minor_index = i;
1114                 mutex_init(&drv->cs[i].mutex);
1115         }
1116
1117         gigaset_if_initdriver(drv, procname, devname);
1118
1119         spin_lock_irqsave(&driver_lock, flags);
1120         list_add(&drv->list, &drivers);
1121         spin_unlock_irqrestore(&driver_lock, flags);
1122
1123         return drv;
1124
1125 error:
1126         kfree(drv);
1127         return NULL;
1128 }
1129 EXPORT_SYMBOL_GPL(gigaset_initdriver);
1130
1131 /**
1132  * gigaset_blockdriver() - block driver
1133  * @drv:        driver descriptor structure.
1134  *
1135  * Prevents the driver from attaching new devices, in preparation for
1136  * deregistration.
1137  */
1138 void gigaset_blockdriver(struct gigaset_driver *drv)
1139 {
1140         drv->blocked = 1;
1141 }
1142 EXPORT_SYMBOL_GPL(gigaset_blockdriver);
1143
1144 static int __init gigaset_init_module(void)
1145 {
1146         /* in accordance with the principle of least astonishment,
1147          * setting the 'debug' parameter to 1 activates a sensible
1148          * set of default debug levels
1149          */
1150         if (gigaset_debuglevel == 1)
1151                 gigaset_debuglevel = DEBUG_DEFAULT;
1152
1153         pr_info(DRIVER_DESC DRIVER_DESC_DEBUG "\n");
1154         gigaset_isdn_regdrv();
1155         return 0;
1156 }
1157
1158 static void __exit gigaset_exit_module(void)
1159 {
1160         gigaset_isdn_unregdrv();
1161 }
1162
1163 module_init(gigaset_init_module);
1164 module_exit(gigaset_exit_module);
1165
1166 MODULE_AUTHOR(DRIVER_AUTHOR);
1167 MODULE_DESCRIPTION(DRIVER_DESC);
1168
1169 MODULE_LICENSE("GPL");