linux/drivers/isdn/gigaset/common.c
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   1/*
   2 * Stuff used by all variants of the driver
   3 *
   4 * Copyright (c) 2001 by Stefan Eilers,
   5 *                       Hansjoerg Lipp <hjlipp@web.de>,
   6 *                       Tilman Schmidt <tilman@imap.cc>.
   7 *
   8 * =====================================================================
   9 *      This program is free software; you can redistribute it and/or
  10 *      modify it under the terms of the GNU General Public License as
  11 *      published by the Free Software Foundation; either version 2 of
  12 *      the License, or (at your option) any later version.
  13 * =====================================================================
  14 */
  15
  16#include "gigaset.h"
  17#include <linux/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 */
  31int gigaset_debuglevel;
  32EXPORT_SYMBOL_GPL(gigaset_debuglevel);
  33module_param_named(debug, gigaset_debuglevel, int, S_IRUGO | S_IWUSR);
  34MODULE_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 */
  51void 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}
  87EXPORT_SYMBOL_GPL(gigaset_dbg_buffer);
  88
  89static 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
 106int 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
 132error:
 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
 140static 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
 156static void timer_tick(struct timer_list *t)
 157{
 158        struct cardstate *cs = from_timer(cs, t, timer);
 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
 188int 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
 206struct 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
 232void 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
 250int 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
 272void 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
 284void 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
 296static 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 */
 332struct 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}
 363EXPORT_SYMBOL_GPL(gigaset_add_event);
 364
 365static 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
 375static 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
 386static 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
 405static 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        }
 423exit:
 424        spin_unlock_irqrestore(&drv->lock, flags);
 425        return ret;
 426}
 427
 428static void free_cs(struct cardstate *cs)
 429{
 430        cs->flags = 0;
 431}
 432
 433static 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
 442static 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 */
 460void 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        spin_lock_irqsave(&cs->lock, flags);
 471        cs->running = 0;
 472        spin_unlock_irqrestore(&cs->lock, flags); /* event handler and timer are
 473                                                     not rescheduled below */
 474
 475        tasklet_kill(&cs->event_tasklet);
 476        del_timer_sync(&cs->timer);
 477
 478        switch (cs->cs_init) {
 479        default:
 480                /* clear B channel structures */
 481                for (i = 0; i < cs->channels; ++i) {
 482                        gig_dbg(DEBUG_INIT, "clearing bcs[%d]", i);
 483                        gigaset_freebcs(cs->bcs + i);
 484                }
 485
 486                /* clear device sysfs */
 487                gigaset_free_dev_sysfs(cs);
 488
 489                gigaset_if_free(cs);
 490
 491                gig_dbg(DEBUG_INIT, "clearing hw");
 492                cs->ops->freecshw(cs);
 493
 494                /* fall through */
 495        case 2: /* error in initcshw */
 496                /* Deregister from LL */
 497                make_invalid(cs, VALID_ID);
 498                gigaset_isdn_unregdev(cs);
 499
 500                /* fall through */
 501        case 1: /* error when registering to LL */
 502                gig_dbg(DEBUG_INIT, "clearing at_state");
 503                clear_at_state(&cs->at_state);
 504                dealloc_temp_at_states(cs);
 505                clear_events(cs);
 506                tty_port_destroy(&cs->port);
 507
 508                /* fall through */
 509        case 0: /* error in basic setup */
 510                gig_dbg(DEBUG_INIT, "freeing inbuf");
 511                kfree(cs->inbuf);
 512                kfree(cs->bcs);
 513        }
 514
 515        mutex_unlock(&cs->mutex);
 516        free_cs(cs);
 517}
 518EXPORT_SYMBOL_GPL(gigaset_freecs);
 519
 520void gigaset_at_init(struct at_state_t *at_state, struct bc_state *bcs,
 521                     struct cardstate *cs, int cid)
 522{
 523        int i;
 524
 525        INIT_LIST_HEAD(&at_state->list);
 526        at_state->waiting = 0;
 527        at_state->getstring = 0;
 528        at_state->pending_commands = 0;
 529        at_state->timer_expires = 0;
 530        at_state->timer_active = 0;
 531        at_state->timer_index = 0;
 532        at_state->seq_index = 0;
 533        at_state->ConState = 0;
 534        for (i = 0; i < STR_NUM; ++i)
 535                at_state->str_var[i] = NULL;
 536        at_state->int_var[VAR_ZDLE] = 0;
 537        at_state->int_var[VAR_ZCTP] = -1;
 538        at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
 539        at_state->cs = cs;
 540        at_state->bcs = bcs;
 541        at_state->cid = cid;
 542        if (!cid)
 543                at_state->replystruct = cs->tabnocid;
 544        else
 545                at_state->replystruct = cs->tabcid;
 546}
 547
 548
 549static void gigaset_inbuf_init(struct inbuf_t *inbuf, struct cardstate *cs)
 550/* inbuf->read must be allocated before! */
 551{
 552        inbuf->head = 0;
 553        inbuf->tail = 0;
 554        inbuf->cs = cs;
 555        inbuf->inputstate = INS_command;
 556}
 557
 558/**
 559 * gigaset_fill_inbuf() - append received data to input buffer
 560 * @inbuf:      buffer structure.
 561 * @src:        received data.
 562 * @numbytes:   number of bytes received.
 563 *
 564 * Return value: !=0 if some data was appended
 565 */
 566int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src,
 567                       unsigned numbytes)
 568{
 569        unsigned n, head, tail, bytesleft;
 570
 571        gig_dbg(DEBUG_INTR, "received %u bytes", numbytes);
 572
 573        if (!numbytes)
 574                return 0;
 575
 576        bytesleft = numbytes;
 577        tail = inbuf->tail;
 578        head = inbuf->head;
 579        gig_dbg(DEBUG_INTR, "buffer state: %u -> %u", head, tail);
 580
 581        while (bytesleft) {
 582                if (head > tail)
 583                        n = head - 1 - tail;
 584                else if (head == 0)
 585                        n = (RBUFSIZE - 1) - tail;
 586                else
 587                        n = RBUFSIZE - tail;
 588                if (!n) {
 589                        dev_err(inbuf->cs->dev,
 590                                "buffer overflow (%u bytes lost)\n",
 591                                bytesleft);
 592                        break;
 593                }
 594                if (n > bytesleft)
 595                        n = bytesleft;
 596                memcpy(inbuf->data + tail, src, n);
 597                bytesleft -= n;
 598                tail = (tail + n) % RBUFSIZE;
 599                src += n;
 600        }
 601        gig_dbg(DEBUG_INTR, "setting tail to %u", tail);
 602        inbuf->tail = tail;
 603        return numbytes != bytesleft;
 604}
 605EXPORT_SYMBOL_GPL(gigaset_fill_inbuf);
 606
 607/* Initialize the b-channel structure */
 608static int gigaset_initbcs(struct bc_state *bcs, struct cardstate *cs,
 609                           int channel)
 610{
 611        int i;
 612
 613        bcs->tx_skb = NULL;
 614
 615        skb_queue_head_init(&bcs->squeue);
 616
 617        bcs->corrupted = 0;
 618        bcs->trans_down = 0;
 619        bcs->trans_up = 0;
 620
 621        gig_dbg(DEBUG_INIT, "setting up bcs[%d]->at_state", channel);
 622        gigaset_at_init(&bcs->at_state, bcs, cs, -1);
 623
 624#ifdef CONFIG_GIGASET_DEBUG
 625        bcs->emptycount = 0;
 626#endif
 627
 628        bcs->rx_bufsize = 0;
 629        bcs->rx_skb = NULL;
 630        bcs->rx_fcs = PPP_INITFCS;
 631        bcs->inputstate = 0;
 632        bcs->channel = channel;
 633        bcs->cs = cs;
 634
 635        bcs->chstate = 0;
 636        bcs->use_count = 1;
 637        bcs->busy = 0;
 638        bcs->ignore = cs->ignoreframes;
 639
 640        for (i = 0; i < AT_NUM; ++i)
 641                bcs->commands[i] = NULL;
 642
 643        spin_lock_init(&bcs->aplock);
 644        bcs->ap = NULL;
 645        bcs->apconnstate = 0;
 646
 647        gig_dbg(DEBUG_INIT, "  setting up bcs[%d]->hw", channel);
 648        return cs->ops->initbcshw(bcs);
 649}
 650
 651/**
 652 * gigaset_initcs() - initialize device structure
 653 * @drv:        hardware driver the device belongs to
 654 * @channels:   number of B channels supported by device
 655 * @onechannel: !=0 if B channel data and AT commands share one
 656 *                  communication channel (M10x),
 657 *              ==0 if B channels have separate communication channels (base)
 658 * @ignoreframes:       number of frames to ignore after setting up B channel
 659 * @cidmode:    !=0: start in CallID mode
 660 * @modulename: name of driver module for LL registration
 661 *
 662 * Allocate and initialize cardstate structure for Gigaset driver
 663 * Calls hardware dependent gigaset_initcshw() function
 664 * Calls B channel initialization function gigaset_initbcs() for each B channel
 665 *
 666 * Return value:
 667 *      pointer to cardstate structure
 668 */
 669struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels,
 670                                 int onechannel, int ignoreframes,
 671                                 int cidmode, const char *modulename)
 672{
 673        struct cardstate *cs;
 674        unsigned long flags;
 675        int i;
 676
 677        gig_dbg(DEBUG_INIT, "allocating cs");
 678        cs = alloc_cs(drv);
 679        if (!cs) {
 680                pr_err("maximum number of devices exceeded\n");
 681                return NULL;
 682        }
 683
 684        cs->cs_init = 0;
 685        cs->channels = channels;
 686        cs->onechannel = onechannel;
 687        cs->ignoreframes = ignoreframes;
 688        INIT_LIST_HEAD(&cs->temp_at_states);
 689        cs->running = 0;
 690        timer_setup(&cs->timer, timer_tick, 0);
 691        spin_lock_init(&cs->ev_lock);
 692        cs->ev_tail = 0;
 693        cs->ev_head = 0;
 694
 695        tasklet_init(&cs->event_tasklet, gigaset_handle_event,
 696                     (unsigned long) cs);
 697        tty_port_init(&cs->port);
 698        cs->commands_pending = 0;
 699        cs->cur_at_seq = 0;
 700        cs->gotfwver = -1;
 701        cs->dev = NULL;
 702        cs->tty_dev = NULL;
 703        cs->cidmode = cidmode != 0;
 704        cs->tabnocid = gigaset_tab_nocid;
 705        cs->tabcid = gigaset_tab_cid;
 706
 707        init_waitqueue_head(&cs->waitqueue);
 708        cs->waiting = 0;
 709
 710        cs->mode = M_UNKNOWN;
 711        cs->mstate = MS_UNINITIALIZED;
 712
 713        cs->bcs = kmalloc(channels * sizeof(struct bc_state), GFP_KERNEL);
 714        cs->inbuf = kmalloc(sizeof(struct inbuf_t), GFP_KERNEL);
 715        if (!cs->bcs || !cs->inbuf) {
 716                pr_err("out of memory\n");
 717                goto error;
 718        }
 719        ++cs->cs_init;
 720
 721        gig_dbg(DEBUG_INIT, "setting up at_state");
 722        spin_lock_init(&cs->lock);
 723        gigaset_at_init(&cs->at_state, NULL, cs, 0);
 724        cs->dle = 0;
 725        cs->cbytes = 0;
 726
 727        gig_dbg(DEBUG_INIT, "setting up inbuf");
 728        gigaset_inbuf_init(cs->inbuf, cs);
 729
 730        cs->connected = 0;
 731        cs->isdn_up = 0;
 732
 733        gig_dbg(DEBUG_INIT, "setting up cmdbuf");
 734        cs->cmdbuf = cs->lastcmdbuf = NULL;
 735        spin_lock_init(&cs->cmdlock);
 736        cs->curlen = 0;
 737        cs->cmdbytes = 0;
 738
 739        gig_dbg(DEBUG_INIT, "setting up iif");
 740        if (gigaset_isdn_regdev(cs, modulename) < 0) {
 741                pr_err("error registering ISDN device\n");
 742                goto error;
 743        }
 744
 745        make_valid(cs, VALID_ID);
 746        ++cs->cs_init;
 747        gig_dbg(DEBUG_INIT, "setting up hw");
 748        if (cs->ops->initcshw(cs) < 0)
 749                goto error;
 750
 751        ++cs->cs_init;
 752
 753        /* set up character device */
 754        gigaset_if_init(cs);
 755
 756        /* set up device sysfs */
 757        gigaset_init_dev_sysfs(cs);
 758
 759        /* set up channel data structures */
 760        for (i = 0; i < channels; ++i) {
 761                gig_dbg(DEBUG_INIT, "setting up bcs[%d]", i);
 762                if (gigaset_initbcs(cs->bcs + i, cs, i) < 0) {
 763                        pr_err("could not allocate channel %d data\n", i);
 764                        goto error;
 765                }
 766        }
 767
 768        spin_lock_irqsave(&cs->lock, flags);
 769        cs->running = 1;
 770        spin_unlock_irqrestore(&cs->lock, flags);
 771        cs->timer.expires = jiffies + msecs_to_jiffies(GIG_TICK);
 772        add_timer(&cs->timer);
 773
 774        gig_dbg(DEBUG_INIT, "cs initialized");
 775        return cs;
 776
 777error:
 778        gig_dbg(DEBUG_INIT, "failed");
 779        gigaset_freecs(cs);
 780        return NULL;
 781}
 782EXPORT_SYMBOL_GPL(gigaset_initcs);
 783
 784/* ReInitialize the b-channel structure on hangup */
 785void gigaset_bcs_reinit(struct bc_state *bcs)
 786{
 787        struct sk_buff *skb;
 788        struct cardstate *cs = bcs->cs;
 789        unsigned long flags;
 790
 791        while ((skb = skb_dequeue(&bcs->squeue)) != NULL)
 792                dev_kfree_skb(skb);
 793
 794        spin_lock_irqsave(&cs->lock, flags);
 795        clear_at_state(&bcs->at_state);
 796        bcs->at_state.ConState = 0;
 797        bcs->at_state.timer_active = 0;
 798        bcs->at_state.timer_expires = 0;
 799        bcs->at_state.cid = -1;                 /* No CID defined */
 800        spin_unlock_irqrestore(&cs->lock, flags);
 801
 802        bcs->inputstate = 0;
 803
 804#ifdef CONFIG_GIGASET_DEBUG
 805        bcs->emptycount = 0;
 806#endif
 807
 808        bcs->rx_fcs = PPP_INITFCS;
 809        bcs->chstate = 0;
 810
 811        bcs->ignore = cs->ignoreframes;
 812        dev_kfree_skb(bcs->rx_skb);
 813        bcs->rx_skb = NULL;
 814
 815        cs->ops->reinitbcshw(bcs);
 816}
 817
 818static void cleanup_cs(struct cardstate *cs)
 819{
 820        struct cmdbuf_t *cb, *tcb;
 821        int i;
 822        unsigned long flags;
 823
 824        spin_lock_irqsave(&cs->lock, flags);
 825
 826        cs->mode = M_UNKNOWN;
 827        cs->mstate = MS_UNINITIALIZED;
 828
 829        clear_at_state(&cs->at_state);
 830        dealloc_temp_at_states(cs);
 831        gigaset_at_init(&cs->at_state, NULL, cs, 0);
 832
 833        cs->inbuf->inputstate = INS_command;
 834        cs->inbuf->head = 0;
 835        cs->inbuf->tail = 0;
 836
 837        cb = cs->cmdbuf;
 838        while (cb) {
 839                tcb = cb;
 840                cb = cb->next;
 841                kfree(tcb);
 842        }
 843        cs->cmdbuf = cs->lastcmdbuf = NULL;
 844        cs->curlen = 0;
 845        cs->cmdbytes = 0;
 846        cs->gotfwver = -1;
 847        cs->dle = 0;
 848        cs->cur_at_seq = 0;
 849        cs->commands_pending = 0;
 850        cs->cbytes = 0;
 851
 852        spin_unlock_irqrestore(&cs->lock, flags);
 853
 854        for (i = 0; i < cs->channels; ++i) {
 855                gigaset_freebcs(cs->bcs + i);
 856                if (gigaset_initbcs(cs->bcs + i, cs, i) < 0)
 857                        pr_err("could not allocate channel %d data\n", i);
 858        }
 859
 860        if (cs->waiting) {
 861                cs->cmd_result = -ENODEV;
 862                cs->waiting = 0;
 863                wake_up_interruptible(&cs->waitqueue);
 864        }
 865}
 866
 867
 868/**
 869 * gigaset_start() - start device operations
 870 * @cs:         device descriptor structure.
 871 *
 872 * Prepares the device for use by setting up communication parameters,
 873 * scheduling an EV_START event to initiate device initialization, and
 874 * waiting for completion of the initialization.
 875 *
 876 * Return value:
 877 *      0 on success, error code < 0 on failure
 878 */
 879int gigaset_start(struct cardstate *cs)
 880{
 881        unsigned long flags;
 882
 883        if (mutex_lock_interruptible(&cs->mutex))
 884                return -EBUSY;
 885
 886        spin_lock_irqsave(&cs->lock, flags);
 887        cs->connected = 1;
 888        spin_unlock_irqrestore(&cs->lock, flags);
 889
 890        if (cs->mstate != MS_LOCKED) {
 891                cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR | TIOCM_RTS);
 892                cs->ops->baud_rate(cs, B115200);
 893                cs->ops->set_line_ctrl(cs, CS8);
 894                cs->control_state = TIOCM_DTR | TIOCM_RTS;
 895        }
 896
 897        cs->waiting = 1;
 898
 899        if (!gigaset_add_event(cs, &cs->at_state, EV_START, NULL, 0, NULL)) {
 900                cs->waiting = 0;
 901                goto error;
 902        }
 903        gigaset_schedule_event(cs);
 904
 905        wait_event(cs->waitqueue, !cs->waiting);
 906
 907        mutex_unlock(&cs->mutex);
 908        return 0;
 909
 910error:
 911        mutex_unlock(&cs->mutex);
 912        return -ENOMEM;
 913}
 914EXPORT_SYMBOL_GPL(gigaset_start);
 915
 916/**
 917 * gigaset_shutdown() - shut down device operations
 918 * @cs:         device descriptor structure.
 919 *
 920 * Deactivates the device by scheduling an EV_SHUTDOWN event and
 921 * waiting for completion of the shutdown.
 922 *
 923 * Return value:
 924 *      0 - success, -ENODEV - error (no device associated)
 925 */
 926int gigaset_shutdown(struct cardstate *cs)
 927{
 928        mutex_lock(&cs->mutex);
 929
 930        if (!(cs->flags & VALID_MINOR)) {
 931                mutex_unlock(&cs->mutex);
 932                return -ENODEV;
 933        }
 934
 935        cs->waiting = 1;
 936
 937        if (!gigaset_add_event(cs, &cs->at_state, EV_SHUTDOWN, NULL, 0, NULL))
 938                goto exit;
 939        gigaset_schedule_event(cs);
 940
 941        wait_event(cs->waitqueue, !cs->waiting);
 942
 943        cleanup_cs(cs);
 944
 945exit:
 946        mutex_unlock(&cs->mutex);
 947        return 0;
 948}
 949EXPORT_SYMBOL_GPL(gigaset_shutdown);
 950
 951/**
 952 * gigaset_stop() - stop device operations
 953 * @cs:         device descriptor structure.
 954 *
 955 * Stops operations on the device by scheduling an EV_STOP event and
 956 * waiting for completion of the shutdown.
 957 */
 958void gigaset_stop(struct cardstate *cs)
 959{
 960        mutex_lock(&cs->mutex);
 961
 962        cs->waiting = 1;
 963
 964        if (!gigaset_add_event(cs, &cs->at_state, EV_STOP, NULL, 0, NULL))
 965                goto exit;
 966        gigaset_schedule_event(cs);
 967
 968        wait_event(cs->waitqueue, !cs->waiting);
 969
 970        cleanup_cs(cs);
 971
 972exit:
 973        mutex_unlock(&cs->mutex);
 974}
 975EXPORT_SYMBOL_GPL(gigaset_stop);
 976
 977static LIST_HEAD(drivers);
 978static DEFINE_SPINLOCK(driver_lock);
 979
 980struct cardstate *gigaset_get_cs_by_id(int id)
 981{
 982        unsigned long flags;
 983        struct cardstate *ret = NULL;
 984        struct cardstate *cs;
 985        struct gigaset_driver *drv;
 986        unsigned i;
 987
 988        spin_lock_irqsave(&driver_lock, flags);
 989        list_for_each_entry(drv, &drivers, list) {
 990                spin_lock(&drv->lock);
 991                for (i = 0; i < drv->minors; ++i) {
 992                        cs = drv->cs + i;
 993                        if ((cs->flags & VALID_ID) && cs->myid == id) {
 994                                ret = cs;
 995                                break;
 996                        }
 997                }
 998                spin_unlock(&drv->lock);
 999                if (ret)
1000                        break;
1001        }
1002        spin_unlock_irqrestore(&driver_lock, flags);
1003        return ret;
1004}
1005
1006static struct cardstate *gigaset_get_cs_by_minor(unsigned minor)
1007{
1008        unsigned long flags;
1009        struct cardstate *ret = NULL;
1010        struct gigaset_driver *drv;
1011        unsigned index;
1012
1013        spin_lock_irqsave(&driver_lock, flags);
1014        list_for_each_entry(drv, &drivers, list) {
1015                if (minor < drv->minor || minor >= drv->minor + drv->minors)
1016                        continue;
1017                index = minor - drv->minor;
1018                spin_lock(&drv->lock);
1019                if (drv->cs[index].flags & VALID_MINOR)
1020                        ret = drv->cs + index;
1021                spin_unlock(&drv->lock);
1022                if (ret)
1023                        break;
1024        }
1025        spin_unlock_irqrestore(&driver_lock, flags);
1026        return ret;
1027}
1028
1029struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty)
1030{
1031        return gigaset_get_cs_by_minor(tty->index + tty->driver->minor_start);
1032}
1033
1034/**
1035 * gigaset_freedriver() - free all associated ressources of a driver
1036 * @drv:        driver descriptor structure.
1037 *
1038 * Unregisters the driver from the system and deallocates the driver
1039 * structure @drv and all structures referenced from it.
1040 * All devices should be shut down before calling this.
1041 */
1042void gigaset_freedriver(struct gigaset_driver *drv)
1043{
1044        unsigned long flags;
1045
1046        spin_lock_irqsave(&driver_lock, flags);
1047        list_del(&drv->list);
1048        spin_unlock_irqrestore(&driver_lock, flags);
1049
1050        gigaset_if_freedriver(drv);
1051
1052        kfree(drv->cs);
1053        kfree(drv);
1054}
1055EXPORT_SYMBOL_GPL(gigaset_freedriver);
1056
1057/**
1058 * gigaset_initdriver() - initialize driver structure
1059 * @minor:      First minor number
1060 * @minors:     Number of minors this driver can handle
1061 * @procname:   Name of the driver
1062 * @devname:    Name of the device files (prefix without minor number)
1063 *
1064 * Allocate and initialize gigaset_driver structure. Initialize interface.
1065 *
1066 * Return value:
1067 *      Pointer to the gigaset_driver structure on success, NULL on failure.
1068 */
1069struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors,
1070                                          const char *procname,
1071                                          const char *devname,
1072                                          const struct gigaset_ops *ops,
1073                                          struct module *owner)
1074{
1075        struct gigaset_driver *drv;
1076        unsigned long flags;
1077        unsigned i;
1078
1079        drv = kmalloc(sizeof *drv, GFP_KERNEL);
1080        if (!drv)
1081                return NULL;
1082
1083        drv->have_tty = 0;
1084        drv->minor = minor;
1085        drv->minors = minors;
1086        spin_lock_init(&drv->lock);
1087        drv->blocked = 0;
1088        drv->ops = ops;
1089        drv->owner = owner;
1090        INIT_LIST_HEAD(&drv->list);
1091
1092        drv->cs = kmalloc(minors * sizeof *drv->cs, GFP_KERNEL);
1093        if (!drv->cs)
1094                goto error;
1095
1096        for (i = 0; i < minors; ++i) {
1097                drv->cs[i].flags = 0;
1098                drv->cs[i].driver = drv;
1099                drv->cs[i].ops = drv->ops;
1100                drv->cs[i].minor_index = i;
1101                mutex_init(&drv->cs[i].mutex);
1102        }
1103
1104        gigaset_if_initdriver(drv, procname, devname);
1105
1106        spin_lock_irqsave(&driver_lock, flags);
1107        list_add(&drv->list, &drivers);
1108        spin_unlock_irqrestore(&driver_lock, flags);
1109
1110        return drv;
1111
1112error:
1113        kfree(drv);
1114        return NULL;
1115}
1116EXPORT_SYMBOL_GPL(gigaset_initdriver);
1117
1118/**
1119 * gigaset_blockdriver() - block driver
1120 * @drv:        driver descriptor structure.
1121 *
1122 * Prevents the driver from attaching new devices, in preparation for
1123 * deregistration.
1124 */
1125void gigaset_blockdriver(struct gigaset_driver *drv)
1126{
1127        drv->blocked = 1;
1128}
1129EXPORT_SYMBOL_GPL(gigaset_blockdriver);
1130
1131static int __init gigaset_init_module(void)
1132{
1133        /* in accordance with the principle of least astonishment,
1134         * setting the 'debug' parameter to 1 activates a sensible
1135         * set of default debug levels
1136         */
1137        if (gigaset_debuglevel == 1)
1138                gigaset_debuglevel = DEBUG_DEFAULT;
1139
1140        pr_info(DRIVER_DESC DRIVER_DESC_DEBUG "\n");
1141        gigaset_isdn_regdrv();
1142        return 0;
1143}
1144
1145static void __exit gigaset_exit_module(void)
1146{
1147        gigaset_isdn_unregdrv();
1148}
1149
1150module_init(gigaset_init_module);
1151module_exit(gigaset_exit_module);
1152
1153MODULE_AUTHOR(DRIVER_AUTHOR);
1154MODULE_DESCRIPTION(DRIVER_DESC);
1155
1156MODULE_LICENSE("GPL");
1157