drivers/pcmcia/cs.c

   1 /*
   2  * cs.c -- Kernel Card Services - core services
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * The initial developer of the original code is David A. Hinds
   9  * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
  10  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
  11  *
  12  * (C) 1999             David A. Hinds
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/moduleparam.h>
  17 #include <linux/init.h>
  18 #include <linux/kernel.h>
  19 #include <linux/string.h>
  20 #include <linux/major.h>
  21 #include <linux/errno.h>
  22 #include <linux/slab.h>
  23 #include <linux/mm.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/timer.h>
  26 #include <linux/ioport.h>
  27 #include <linux/delay.h>
  28 #include <linux/pm.h>
  29 #include <linux/device.h>
  30 #include <linux/kthread.h>
  31 #include <linux/freezer.h>
  32 #include <asm/irq.h>
  33
  34 #include <pcmcia/ss.h>
  35 #include <pcmcia/cistpl.h>
  36 #include <pcmcia/cisreg.h>
  37 #include <pcmcia/ds.h>
  38 #include "cs_internal.h"
  39
  40
  41 /* Module parameters */
  42
  43 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
  44 MODULE_DESCRIPTION("Linux Kernel Card Services");
  45 MODULE_LICENSE("GPL");
  46
  47 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
  48
  49 INT_MODULE_PARM(setup_delay,    10);            /* centiseconds */
  50 INT_MODULE_PARM(resume_delay,   20);            /* centiseconds */
  51 INT_MODULE_PARM(shutdown_delay, 3);             /* centiseconds */
  52 INT_MODULE_PARM(vcc_settle,     40);            /* centiseconds */
  53 INT_MODULE_PARM(reset_time,     10);            /* usecs */
  54 INT_MODULE_PARM(unreset_delay,  10);            /* centiseconds */
  55 INT_MODULE_PARM(unreset_check,  10);            /* centiseconds */
  56 INT_MODULE_PARM(unreset_limit,  30);            /* unreset_check's */
  57
  58 /* Access speed for attribute memory windows */
  59 INT_MODULE_PARM(cis_speed,      300);           /* ns */
  60
  61
  62 socket_state_t dead_socket = {
  63         .csc_mask       = SS_DETECT,
  64 };
  65 EXPORT_SYMBOL(dead_socket);
  66
  67
  68 /* List of all sockets, protected by a rwsem */
  69 LIST_HEAD(pcmcia_socket_list);
  70 EXPORT_SYMBOL(pcmcia_socket_list);
  71
  72 DECLARE_RWSEM(pcmcia_socket_list_rwsem);
  73 EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
  74
  75
  76 struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt)
  77 {
  78         struct device *dev = get_device(&skt->dev);
  79         if (!dev)
  80                 return NULL;
  81         return dev_get_drvdata(dev);
  82 }
  83 EXPORT_SYMBOL(pcmcia_get_socket);
  84
  85
  86 void pcmcia_put_socket(struct pcmcia_socket *skt)
  87 {
  88         put_device(&skt->dev);
  89 }
  90 EXPORT_SYMBOL(pcmcia_put_socket);
  91
  92
  93 static void pcmcia_release_socket(struct device *dev)
  94 {
  95         struct pcmcia_socket *socket = dev_get_drvdata(dev);
  96
  97         complete(&socket->socket_released);
  98 }
  99
 100 static int pccardd(void *__skt);
 101
 102 /**
 103  * pcmcia_register_socket - add a new pcmcia socket device
 104  * @socket: the &socket to register
 105  */
 106 int pcmcia_register_socket(struct pcmcia_socket *socket)
 107 {
 108         struct task_struct *tsk;
 109         int ret;
 110
 111         if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
 112                 return -EINVAL;
 113
 114         dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);
 115
 116         /* try to obtain a socket number [yes, it gets ugly if we
 117          * register more than 2^sizeof(unsigned int) pcmcia
 118          * sockets... but the socket number is deprecated
 119          * anyways, so I don't care] */
 120         down_write(&pcmcia_socket_list_rwsem);
 121         if (list_empty(&pcmcia_socket_list))
 122                 socket->sock = 0;
 123         else {
 124                 unsigned int found, i = 1;
 125                 struct pcmcia_socket *tmp;
 126                 do {
 127                         found = 1;
 128                         list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
 129                                 if (tmp->sock == i)
 130                                         found = 0;
 131                         }
 132                         i++;
 133                 } while (!found);
 134                 socket->sock = i - 1;
 135         }
 136         list_add_tail(&socket->socket_list, &pcmcia_socket_list);
 137         up_write(&pcmcia_socket_list_rwsem);
 138
 139 #ifndef CONFIG_CARDBUS
 140         /*
 141          * If we do not support Cardbus, ensure that
 142          * the Cardbus socket capability is disabled.
 143          */
 144         socket->features &= ~SS_CAP_CARDBUS;
 145 #endif
 146
 147         /* set proper values in socket->dev */
 148         dev_set_drvdata(&socket->dev, socket);
 149         socket->dev.class = &pcmcia_socket_class;
 150         dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock);
 151
 152         /* base address = 0, map = 0 */
 153         socket->cis_mem.flags = 0;
 154         socket->cis_mem.speed = cis_speed;
 155
 156         INIT_LIST_HEAD(&socket->cis_cache);
 157
 158         init_completion(&socket->socket_released);
 159         init_completion(&socket->thread_done);
 160         mutex_init(&socket->skt_mutex);
 161         mutex_init(&socket->ops_mutex);
 162         spin_lock_init(&socket->thread_lock);
 163
 164         if (socket->resource_ops->init) {
 165                 mutex_lock(&socket->ops_mutex);
 166                 ret = socket->resource_ops->init(socket);
 167                 mutex_unlock(&socket->ops_mutex);
 168                 if (ret)
 169                         goto err;
 170         }
 171
 172         tsk = kthread_run(pccardd, socket, "pccardd");
 173         if (IS_ERR(tsk)) {
 174                 ret = PTR_ERR(tsk);
 175                 goto err;
 176         }
 177
 178         wait_for_completion(&socket->thread_done);
 179         if (!socket->thread) {
 180                 dev_warn(&socket->dev,
 181                          "PCMCIA: warning: socket thread did not start\n");
 182                 return -EIO;
 183         }
 184
 185         pcmcia_parse_events(socket, SS_DETECT);
 186
 187         /*
 188          * Let's try to get the PCMCIA module for 16-bit PCMCIA support.
 189          * If it fails, it doesn't matter -- we still have 32-bit CardBus
 190          * support to offer, so this is not a failure mode.
 191          */
 192         request_module_nowait("pcmcia");
 193
 194         return 0;
 195
 196  err:
 197         down_write(&pcmcia_socket_list_rwsem);
 198         list_del(&socket->socket_list);
 199         up_write(&pcmcia_socket_list_rwsem);
 200         return ret;
 201 } /* pcmcia_register_socket */
 202 EXPORT_SYMBOL(pcmcia_register_socket);
 203
 204
 205 /**
 206  * pcmcia_unregister_socket - remove a pcmcia socket device
 207  * @socket: the &socket to unregister
 208  */
 209 void pcmcia_unregister_socket(struct pcmcia_socket *socket)
 210 {
 211         if (!socket)
 212                 return;
 213
 214         dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
 215
 216         if (socket->thread)
 217                 kthread_stop(socket->thread);
 218
 219         /* remove from our own list */
 220         down_write(&pcmcia_socket_list_rwsem);
 221         list_del(&socket->socket_list);
 222         up_write(&pcmcia_socket_list_rwsem);
 223
 224         /* wait for sysfs to drop all references */
 225         if (socket->resource_ops->exit) {
 226                 mutex_lock(&socket->ops_mutex);
 227                 socket->resource_ops->exit(socket);
 228                 mutex_unlock(&socket->ops_mutex);
 229         }
 230         wait_for_completion(&socket->socket_released);
 231 } /* pcmcia_unregister_socket */
 232 EXPORT_SYMBOL(pcmcia_unregister_socket);
 233
 234
 235 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr)
 236 {
 237         struct pcmcia_socket *s;
 238
 239         down_read(&pcmcia_socket_list_rwsem);
 240         list_for_each_entry(s, &pcmcia_socket_list, socket_list)
 241                 if (s->sock == nr) {
 242                         up_read(&pcmcia_socket_list_rwsem);
 243                         return s;
 244                 }
 245         up_read(&pcmcia_socket_list_rwsem);
 246
 247         return NULL;
 248
 249 }
 250 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
 251
 252 static int socket_reset(struct pcmcia_socket *skt)
 253 {
 254         int status, i;
 255
 256         dev_dbg(&skt->dev, "reset\n");
 257
 258         skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
 259         skt->ops->set_socket(skt, &skt->socket);
 260         udelay((long)reset_time);
 261
 262         skt->socket.flags &= ~SS_RESET;
 263         skt->ops->set_socket(skt, &skt->socket);
 264
 265         msleep(unreset_delay * 10);
 266         for (i = 0; i < unreset_limit; i++) {
 267                 skt->ops->get_status(skt, &status);
 268
 269                 if (!(status & SS_DETECT))
 270                         return -ENODEV;
 271
 272                 if (status & SS_READY)
 273                         return 0;
 274
 275                 msleep(unreset_check * 10);
 276         }
 277
 278         dev_err(&skt->dev, "time out after reset\n");
 279         return -ETIMEDOUT;
 280 }
 281
 282 /*
 283  * socket_setup() and socket_shutdown() are called by the main event handler
 284  * when card insertion and removal events are received.
 285  * socket_setup() turns on socket power and resets the socket, in two stages.
 286  * socket_shutdown() unconfigures a socket and turns off socket power.
 287  */
 288 static void socket_shutdown(struct pcmcia_socket *s)
 289 {
 290         int status;
 291
 292         dev_dbg(&s->dev, "shutdown\n");
 293
 294         if (s->callback)
 295                 s->callback->remove(s);
 296
 297         mutex_lock(&s->ops_mutex);
 298         s->state &= SOCKET_INUSE | SOCKET_PRESENT;
 299         msleep(shutdown_delay * 10);
 300         s->state &= SOCKET_INUSE;
 301
 302         /* Blank out the socket state */
 303         s->socket = dead_socket;
 304         s->ops->init(s);
 305         s->ops->set_socket(s, &s->socket);
 306         s->lock_count = 0;
 307         kfree(s->fake_cis);
 308         s->fake_cis = NULL;
 309         s->functions = 0;
 310
 311         /* From here on we can be sure that only we (that is, the
 312          * pccardd thread) accesses this socket, and all (16-bit)
 313          * PCMCIA interactions are gone. Therefore, release
 314          * ops_mutex so that we don't get a sysfs-related lockdep
 315          * warning.
 316          */
 317         mutex_unlock(&s->ops_mutex);
 318
 319 #ifdef CONFIG_CARDBUS
 320         cb_free(s);
 321 #endif
 322
 323         /* give socket some time to power down */
 324         msleep(100);
 325
 326         s->ops->get_status(s, &status);
 327         if (status & SS_POWERON) {
 328                 dev_err(&s->dev,
 329                         "*** DANGER *** unable to remove socket power\n");
 330         }
 331
 332         s->state &= ~SOCKET_INUSE;
 333 }
 334
 335 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
 336 {
 337         int status, i;
 338
 339         dev_dbg(&skt->dev, "setup\n");
 340
 341         skt->ops->get_status(skt, &status);
 342         if (!(status & SS_DETECT))
 343                 return -ENODEV;
 344
 345         msleep(initial_delay * 10);
 346
 347         for (i = 0; i < 100; i++) {
 348                 skt->ops->get_status(skt, &status);
 349                 if (!(status & SS_DETECT))
 350                         return -ENODEV;
 351
 352                 if (!(status & SS_PENDING))
 353                         break;
 354
 355                 msleep(100);
 356         }
 357
 358         if (status & SS_PENDING) {
 359                 dev_err(&skt->dev, "voltage interrogation timed out\n");
 360                 return -ETIMEDOUT;
 361         }
 362
 363         if (status & SS_CARDBUS) {
 364                 if (!(skt->features & SS_CAP_CARDBUS)) {
 365                         dev_err(&skt->dev, "cardbus cards are not supported\n");
 366                         return -EINVAL;
 367                 }
 368                 skt->state |= SOCKET_CARDBUS;
 369         } else
 370                 skt->state &= ~SOCKET_CARDBUS;
 371
 372         /*
 373          * Decode the card voltage requirements, and apply power to the card.
 374          */
 375         if (status & SS_3VCARD)
 376                 skt->socket.Vcc = skt->socket.Vpp = 33;
 377         else if (!(status & SS_XVCARD))
 378                 skt->socket.Vcc = skt->socket.Vpp = 50;
 379         else {
 380                 dev_err(&skt->dev, "unsupported voltage key\n");
 381                 return -EIO;
 382         }
 383
 384         if (skt->power_hook)
 385                 skt->power_hook(skt, HOOK_POWER_PRE);
 386
 387         skt->socket.flags = 0;
 388         skt->ops->set_socket(skt, &skt->socket);
 389
 390         /*
 391          * Wait "vcc_settle" for the supply to stabilise.
 392          */
 393         msleep(vcc_settle * 10);
 394
 395         skt->ops->get_status(skt, &status);
 396         if (!(status & SS_POWERON)) {
 397                 dev_err(&skt->dev, "unable to apply power\n");
 398                 return -EIO;
 399         }
 400
 401         status = socket_reset(skt);
 402
 403         if (skt->power_hook)
 404                 skt->power_hook(skt, HOOK_POWER_POST);
 405
 406         return status;
 407 }
 408
 409 /*
 410  * Handle card insertion.  Setup the socket, reset the card,
 411  * and then tell the rest of PCMCIA that a card is present.
 412  */
 413 static int socket_insert(struct pcmcia_socket *skt)
 414 {
 415         int ret;
 416
 417         dev_dbg(&skt->dev, "insert\n");
 418
 419         mutex_lock(&skt->ops_mutex);
 420         if (skt->state & SOCKET_INUSE) {
 421                 mutex_unlock(&skt->ops_mutex);
 422                 return -EINVAL;
 423         }
 424         skt->state |= SOCKET_INUSE;
 425
 426         ret = socket_setup(skt, setup_delay);
 427         if (ret == 0) {
 428                 skt->state |= SOCKET_PRESENT;
 429
 430                 dev_notice(&skt->dev, "pccard: %s card inserted into slot %d\n",
 431                            (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
 432                            skt->sock);
 433
 434 #ifdef CONFIG_CARDBUS
 435                 if (skt->state & SOCKET_CARDBUS) {
 436                         cb_alloc(skt);
 437                         skt->state |= SOCKET_CARDBUS_CONFIG;
 438                 }
 439 #endif
 440                 dev_dbg(&skt->dev, "insert done\n");
 441                 mutex_unlock(&skt->ops_mutex);
 442
 443                 if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
 444                         skt->callback->add(skt);
 445         } else {
 446                 mutex_unlock(&skt->ops_mutex);
 447                 socket_shutdown(skt);
 448         }
 449
 450         return ret;
 451 }
 452
 453 static int socket_suspend(struct pcmcia_socket *skt)
 454 {
 455         if ((skt->state & SOCKET_SUSPEND) && !(skt->state & SOCKET_IN_RESUME))
 456                 return -EBUSY;
 457
 458         mutex_lock(&skt->ops_mutex);
 459         /* store state on first suspend, but not after spurious wakeups */
 460         if (!(skt->state & SOCKET_IN_RESUME))
 461                 skt->suspended_state = skt->state;
 462
 463         skt->socket = dead_socket;
 464         skt->ops->set_socket(skt, &skt->socket);
 465         if (skt->ops->suspend)
 466                 skt->ops->suspend(skt);
 467         skt->state |= SOCKET_SUSPEND;
 468         skt->state &= ~SOCKET_IN_RESUME;
 469         mutex_unlock(&skt->ops_mutex);
 470         return 0;
 471 }
 472
 473 static int socket_early_resume(struct pcmcia_socket *skt)
 474 {
 475         mutex_lock(&skt->ops_mutex);
 476         skt->socket = dead_socket;
 477         skt->ops->init(skt);
 478         skt->ops->set_socket(skt, &skt->socket);
 479         if (skt->state & SOCKET_PRESENT)
 480                 skt->resume_status = socket_setup(skt, resume_delay);
 481         skt->state |= SOCKET_IN_RESUME;
 482         mutex_unlock(&skt->ops_mutex);
 483         return 0;
 484 }
 485
 486 static int socket_late_resume(struct pcmcia_socket *skt)
 487 {
 488         int ret = 0;
 489
 490         mutex_lock(&skt->ops_mutex);
 491         skt->state &= ~(SOCKET_SUSPEND | SOCKET_IN_RESUME);
 492         mutex_unlock(&skt->ops_mutex);
 493
 494         if (!(skt->state & SOCKET_PRESENT)) {
 495                 ret = socket_insert(skt);
 496                 if (ret == -ENODEV)
 497                         ret = 0;
 498                 return ret;
 499         }
 500
 501         if (skt->resume_status) {
 502                 socket_shutdown(skt);
 503                 return 0;
 504         }
 505
 506         if (skt->suspended_state != skt->state) {
 507                 dev_dbg(&skt->dev,
 508                         "suspend state 0x%x != resume state 0x%x\n",
 509                         skt->suspended_state, skt->state);
 510
 511                 socket_shutdown(skt);
 512                 return socket_insert(skt);
 513         }
 514
 515         if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
 516                 ret = skt->callback->early_resume(skt);
 517         return ret;
 518 }
 519
 520 /*
 521  * Finalize the resume. In case of a cardbus socket, we have
 522  * to rebind the devices as we can't be certain that it has been
 523  * replaced, or not.
 524  */
 525 static int socket_complete_resume(struct pcmcia_socket *skt)
 526 {
 527         int ret = 0;
 528 #ifdef CONFIG_CARDBUS
 529         if (skt->state & SOCKET_CARDBUS) {
 530                 /* We can't be sure the CardBus card is the same
 531                  * as the one previously inserted. Therefore, remove
 532                  * and re-add... */
 533                 cb_free(skt);
 534                 ret = cb_alloc(skt);
 535                 if (ret)
 536                         cb_free(skt);
 537         }
 538 #endif
 539         return ret;
 540 }
 541
 542 /*
 543  * Resume a socket.  If a card is present, verify its CIS against
 544  * our cached copy.  If they are different, the card has been
 545  * replaced, and we need to tell the drivers.
 546  */
 547 static int socket_resume(struct pcmcia_socket *skt)
 548 {
 549         int err;
 550         if (!(skt->state & SOCKET_SUSPEND))
 551                 return -EBUSY;
 552
 553         socket_early_resume(skt);
 554         err = socket_late_resume(skt);
 555         if (!err)
 556                 err = socket_complete_resume(skt);
 557         return err;
 558 }
 559
 560 static void socket_remove(struct pcmcia_socket *skt)
 561 {
 562         dev_notice(&skt->dev, "pccard: card ejected from slot %d\n", skt->sock);
 563         socket_shutdown(skt);
 564 }
 565
 566 /*
 567  * Process a socket card detect status change.
 568  *
 569  * If we don't have a card already present, delay the detect event for
 570  * about 20ms (to be on the safe side) before reading the socket status.
 571  *
 572  * Some i82365-based systems send multiple SS_DETECT events during card
 573  * insertion, and the "card present" status bit seems to bounce.  This
 574  * will probably be true with GPIO-based card detection systems after
 575  * the product has aged.
 576  */
 577 static void socket_detect_change(struct pcmcia_socket *skt)
 578 {
 579         if (!(skt->state & SOCKET_SUSPEND)) {
 580                 int status;
 581
 582                 if (!(skt->state & SOCKET_PRESENT))
 583                         msleep(20);
 584
 585                 skt->ops->get_status(skt, &status);
 586                 if ((skt->state & SOCKET_PRESENT) &&
 587                      !(status & SS_DETECT))
 588                         socket_remove(skt);
 589                 if (!(skt->state & SOCKET_PRESENT) &&
 590                     (status & SS_DETECT))
 591                         socket_insert(skt);
 592         }
 593 }
 594
 595 static int pccardd(void *__skt)
 596 {
 597         struct pcmcia_socket *skt = __skt;
 598         int ret;
 599
 600         skt->thread = current;
 601         skt->socket = dead_socket;
 602         skt->ops->init(skt);
 603         skt->ops->set_socket(skt, &skt->socket);
 604
 605         /* register with the device core */
 606         ret = device_register(&skt->dev);
 607         if (ret) {
 608                 dev_warn(&skt->dev, "PCMCIA: unable to register socket\n");
 609                 skt->thread = NULL;
 610                 complete(&skt->thread_done);
 611                 return 0;
 612         }
 613         ret = pccard_sysfs_add_socket(&skt->dev);
 614         if (ret)
 615                 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
 616
 617         complete(&skt->thread_done);
 618
 619         /* wait for userspace to catch up */
 620         msleep(250);
 621
 622         set_freezable();
 623         for (;;) {
 624                 unsigned long flags;
 625                 unsigned int events;
 626                 unsigned int sysfs_events;
 627
 628                 spin_lock_irqsave(&skt->thread_lock, flags);
 629                 events = skt->thread_events;
 630                 skt->thread_events = 0;
 631                 sysfs_events = skt->sysfs_events;
 632                 skt->sysfs_events = 0;
 633                 spin_unlock_irqrestore(&skt->thread_lock, flags);
 634
 635                 mutex_lock(&skt->skt_mutex);
 636                 if (events & SS_DETECT)
 637                         socket_detect_change(skt);
 638
 639                 if (sysfs_events) {
 640                         if (sysfs_events & PCMCIA_UEVENT_EJECT)
 641                                 socket_remove(skt);
 642                         if (sysfs_events & PCMCIA_UEVENT_INSERT)
 643                                 socket_insert(skt);
 644                         if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) &&
 645                                 !(skt->state & SOCKET_CARDBUS)) {
 646                                 if (skt->callback)
 647                                         ret = skt->callback->suspend(skt);
 648                                 else
 649                                         ret = 0;
 650                                 if (!ret) {
 651                                         socket_suspend(skt);
 652                                         msleep(100);
 653                                 }
 654                         }
 655                         if ((sysfs_events & PCMCIA_UEVENT_RESUME) &&
 656                                 !(skt->state & SOCKET_CARDBUS)) {
 657                                 ret = socket_resume(skt);
 658                                 if (!ret && skt->callback)
 659                                         skt->callback->resume(skt);
 660                         }
 661                         if ((sysfs_events & PCMCIA_UEVENT_REQUERY) &&
 662                                 !(skt->state & SOCKET_CARDBUS)) {
 663                                 if (!ret && skt->callback)
 664                                         skt->callback->requery(skt);
 665                         }
 666                 }
 667                 mutex_unlock(&skt->skt_mutex);
 668
 669                 if (events || sysfs_events)
 670                         continue;
 671
 672                 if (kthread_should_stop())
 673                         break;
 674
 675                 set_current_state(TASK_INTERRUPTIBLE);
 676
 677                 schedule();
 678
 679                 /* make sure we are running */
 680                 __set_current_state(TASK_RUNNING);
 681
 682                 try_to_freeze();
 683         }
 684
 685         /* shut down socket, if a device is still present */
 686         if (skt->state & SOCKET_PRESENT) {
 687                 mutex_lock(&skt->skt_mutex);
 688                 socket_remove(skt);
 689                 mutex_unlock(&skt->skt_mutex);
 690         }
 691
 692         /* remove from the device core */
 693         pccard_sysfs_remove_socket(&skt->dev);
 694         device_unregister(&skt->dev);
 695
 696         return 0;
 697 }
 698
 699 /*
 700  * Yenta (at least) probes interrupts before registering the socket and
 701  * starting the handler thread.
 702  */
 703 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
 704 {
 705         unsigned long flags;
 706         dev_dbg(&s->dev, "parse_events: events %08x\n", events);
 707         if (s->thread) {
 708                 spin_lock_irqsave(&s->thread_lock, flags);
 709                 s->thread_events |= events;
 710                 spin_unlock_irqrestore(&s->thread_lock, flags);
 711
 712                 wake_up_process(s->thread);
 713         }
 714 } /* pcmcia_parse_events */
 715 EXPORT_SYMBOL(pcmcia_parse_events);
 716
 717 /**
 718  * pcmcia_parse_uevents() - tell pccardd to issue manual commands
 719  * @s:          the PCMCIA socket we wan't to command
 720  * @events:     events to pass to pccardd
 721  *
 722  * userspace-issued insert, eject, suspend and resume commands must be
 723  * handled by pccardd to avoid any sysfs-related deadlocks. Valid events
 724  * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert),
 725  * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend)
 726  * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card).
 727  */
 728 void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events)
 729 {
 730         unsigned long flags;
 731         dev_dbg(&s->dev, "parse_uevents: events %08x\n", events);
 732         if (s->thread) {
 733                 spin_lock_irqsave(&s->thread_lock, flags);
 734                 s->sysfs_events |= events;
 735                 spin_unlock_irqrestore(&s->thread_lock, flags);
 736
 737                 wake_up_process(s->thread);
 738         }
 739 }
 740 EXPORT_SYMBOL(pcmcia_parse_uevents);
 741
 742
 743 /* register pcmcia_callback */
 744 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
 745 {
 746         int ret = 0;
 747
 748         /* s->skt_mutex also protects s->callback */
 749         mutex_lock(&s->skt_mutex);
 750
 751         if (c) {
 752                 /* registration */
 753                 if (s->callback) {
 754                         ret = -EBUSY;
 755                         goto err;
 756                 }
 757
 758                 s->callback = c;
 759
 760                 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
 761                         s->callback->add(s);
 762         } else
 763                 s->callback = NULL;
 764  err:
 765         mutex_unlock(&s->skt_mutex);
 766
 767         return ret;
 768 }
 769 EXPORT_SYMBOL(pccard_register_pcmcia);
 770
 771
 772 /* I'm not sure which "reset" function this is supposed to use,
 773  * but for now, it uses the low-level interface's reset, not the
 774  * CIS register.
 775  */
 776
 777 int pcmcia_reset_card(struct pcmcia_socket *skt)
 778 {
 779         int ret;
 780
 781         dev_dbg(&skt->dev, "resetting socket\n");
 782
 783         mutex_lock(&skt->skt_mutex);
 784         do {
 785                 if (!(skt->state & SOCKET_PRESENT)) {
 786                         dev_dbg(&skt->dev, "can't reset, not present\n");
 787                         ret = -ENODEV;
 788                         break;
 789                 }
 790                 if (skt->state & SOCKET_SUSPEND) {
 791                         dev_dbg(&skt->dev, "can't reset, suspended\n");
 792                         ret = -EBUSY;
 793                         break;
 794                 }
 795                 if (skt->state & SOCKET_CARDBUS) {
 796                         dev_dbg(&skt->dev, "can't reset, is cardbus\n");
 797                         ret = -EPERM;
 798                         break;
 799                 }
 800
 801                 if (skt->callback)
 802                         skt->callback->suspend(skt);
 803                 mutex_lock(&skt->ops_mutex);
 804                 ret = socket_reset(skt);
 805                 mutex_unlock(&skt->ops_mutex);
 806                 if ((ret == 0) && (skt->callback))
 807                         skt->callback->resume(skt);
 808
 809                 ret = 0;
 810         } while (0);
 811         mutex_unlock(&skt->skt_mutex);
 812
 813         return ret;
 814 } /* reset_card */
 815 EXPORT_SYMBOL(pcmcia_reset_card);
 816
 817
 818 static int pcmcia_socket_uevent(struct device *dev,
 819                                 struct kobj_uevent_env *env)
 820 {
 821         struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 822
 823         if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
 824                 return -ENOMEM;
 825
 826         return 0;
 827 }
 828
 829
 830 static struct completion pcmcia_unload;
 831
 832 static void pcmcia_release_socket_class(struct class *data)
 833 {
 834         complete(&pcmcia_unload);
 835 }
 836
 837
 838 #ifdef CONFIG_PM
 839
 840 static int __pcmcia_pm_op(struct device *dev,
 841                           int (*callback) (struct pcmcia_socket *skt))
 842 {
 843         struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 844         int ret;
 845
 846         mutex_lock(&s->skt_mutex);
 847         ret = callback(s);
 848         mutex_unlock(&s->skt_mutex);
 849
 850         return ret;
 851 }
 852
 853 static int pcmcia_socket_dev_suspend_noirq(struct device *dev)
 854 {
 855         return __pcmcia_pm_op(dev, socket_suspend);
 856 }
 857
 858 static int pcmcia_socket_dev_resume_noirq(struct device *dev)
 859 {
 860         return __pcmcia_pm_op(dev, socket_early_resume);
 861 }
 862
 863 static int __used pcmcia_socket_dev_resume(struct device *dev)
 864 {
 865         return __pcmcia_pm_op(dev, socket_late_resume);
 866 }
 867
 868 static void __used pcmcia_socket_dev_complete(struct device *dev)
 869 {
 870         WARN(__pcmcia_pm_op(dev, socket_complete_resume),
 871                 "failed to complete resume");
 872 }
 873
 874 static const struct dev_pm_ops pcmcia_socket_pm_ops = {
 875         /* dev_resume may be called with IRQs enabled */
 876         SET_SYSTEM_SLEEP_PM_OPS(NULL,
 877                                 pcmcia_socket_dev_resume)
 878
 879         /* late suspend must be called with IRQs disabled */
 880         .suspend_noirq = pcmcia_socket_dev_suspend_noirq,
 881         .freeze_noirq = pcmcia_socket_dev_suspend_noirq,
 882         .poweroff_noirq = pcmcia_socket_dev_suspend_noirq,
 883
 884         /* early resume must be called with IRQs disabled */
 885         .resume_noirq = pcmcia_socket_dev_resume_noirq,
 886         .thaw_noirq = pcmcia_socket_dev_resume_noirq,
 887         .restore_noirq = pcmcia_socket_dev_resume_noirq,
 888         .complete = pcmcia_socket_dev_complete,
 889 };
 890
 891 #define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops)
 892
 893 #else /* CONFIG_PM */
 894
 895 #define PCMCIA_SOCKET_CLASS_PM_OPS NULL
 896
 897 #endif /* CONFIG_PM */
 898
 899 struct class pcmcia_socket_class = {
 900         .name = "pcmcia_socket",
 901         .dev_uevent = pcmcia_socket_uevent,
 902         .dev_release = pcmcia_release_socket,
 903         .class_release = pcmcia_release_socket_class,
 904         .pm = PCMCIA_SOCKET_CLASS_PM_OPS,
 905 };
 906 EXPORT_SYMBOL(pcmcia_socket_class);
 907
 908
 909 static int __init init_pcmcia_cs(void)
 910 {
 911         init_completion(&pcmcia_unload);
 912         return class_register(&pcmcia_socket_class);
 913 }
 914
 915 static void __exit exit_pcmcia_cs(void)
 916 {
 917         class_unregister(&pcmcia_socket_class);
 918         wait_for_completion(&pcmcia_unload);
 919 }
 920
 921 subsys_initcall(init_pcmcia_cs);
 922 module_exit(exit_pcmcia_cs);
 923