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/system.h>
  33 #include <asm/irq.h>
  34
  35 #include <pcmcia/cs_types.h>
  36 #include <pcmcia/ss.h>
  37 #include <pcmcia/cs.h>
  38 #include <pcmcia/cistpl.h>
  39 #include <pcmcia/cisreg.h>
  40 #include <pcmcia/ds.h>
  41 #include "cs_internal.h"
  42
  43
  44 /* Module parameters */
  45
  46 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
  47 MODULE_DESCRIPTION("Linux Kernel Card Services");
  48 MODULE_LICENSE("GPL");
  49
  50 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
  51
  52 INT_MODULE_PARM(setup_delay,    10);            /* centiseconds */
  53 INT_MODULE_PARM(resume_delay,   20);            /* centiseconds */
  54 INT_MODULE_PARM(shutdown_delay, 3);             /* centiseconds */
  55 INT_MODULE_PARM(vcc_settle,     40);            /* centiseconds */
  56 INT_MODULE_PARM(reset_time,     10);            /* usecs */
  57 INT_MODULE_PARM(unreset_delay,  10);            /* centiseconds */
  58 INT_MODULE_PARM(unreset_check,  10);            /* centiseconds */
  59 INT_MODULE_PARM(unreset_limit,  30);            /* unreset_check's */
  60
  61 /* Access speed for attribute memory windows */
  62 INT_MODULE_PARM(cis_speed,      300);           /* ns */
  63
  64 #ifdef DEBUG
  65 static int pc_debug;
  66
  67 module_param(pc_debug, int, 0644);
  68
  69 int cs_debug_level(int level)
  70 {
  71         return pc_debug > level;
  72 }
  73 #endif
  74
  75
  76 socket_state_t dead_socket = {
  77         .csc_mask       = SS_DETECT,
  78 };
  79 EXPORT_SYMBOL(dead_socket);
  80
  81
  82 /* List of all sockets, protected by a rwsem */
  83 LIST_HEAD(pcmcia_socket_list);
  84 EXPORT_SYMBOL(pcmcia_socket_list);
  85
  86 DECLARE_RWSEM(pcmcia_socket_list_rwsem);
  87 EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
  88
  89
  90 /*
  91  * Low-level PCMCIA socket drivers need to register with the PCCard
  92  * core using pcmcia_register_socket.
  93  *
  94  * socket drivers are expected to use the following callbacks in their
  95  * .drv struct:
  96  *  - pcmcia_socket_dev_suspend
  97  *  - pcmcia_socket_dev_resume
  98  * These functions check for the appropriate struct pcmcia_soket arrays,
  99  * and pass them to the low-level functions pcmcia_{suspend,resume}_socket
 100  */
 101 static int socket_resume(struct pcmcia_socket *skt);
 102 static int socket_suspend(struct pcmcia_socket *skt);
 103
 104 int pcmcia_socket_dev_suspend(struct device *dev, pm_message_t state)
 105 {
 106         struct pcmcia_socket *socket;
 107
 108         down_read(&pcmcia_socket_list_rwsem);
 109         list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
 110                 if (socket->dev.parent != dev)
 111                         continue;
 112                 mutex_lock(&socket->skt_mutex);
 113                 socket_suspend(socket);
 114                 mutex_unlock(&socket->skt_mutex);
 115         }
 116         up_read(&pcmcia_socket_list_rwsem);
 117
 118         return 0;
 119 }
 120 EXPORT_SYMBOL(pcmcia_socket_dev_suspend);
 121
 122 int pcmcia_socket_dev_resume(struct device *dev)
 123 {
 124         struct pcmcia_socket *socket;
 125
 126         down_read(&pcmcia_socket_list_rwsem);
 127         list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
 128                 if (socket->dev.parent != dev)
 129                         continue;
 130                 mutex_lock(&socket->skt_mutex);
 131                 socket_resume(socket);
 132                 mutex_unlock(&socket->skt_mutex);
 133         }
 134         up_read(&pcmcia_socket_list_rwsem);
 135
 136         return 0;
 137 }
 138 EXPORT_SYMBOL(pcmcia_socket_dev_resume);
 139
 140
 141 struct pcmcia_socket * pcmcia_get_socket(struct pcmcia_socket *skt)
 142 {
 143         struct device *dev = get_device(&skt->dev);
 144         if (!dev)
 145                 return NULL;
 146         skt = dev_get_drvdata(dev);
 147         if (!try_module_get(skt->owner)) {
 148                 put_device(&skt->dev);
 149                 return NULL;
 150         }
 151         return (skt);
 152 }
 153 EXPORT_SYMBOL(pcmcia_get_socket);
 154
 155
 156 void pcmcia_put_socket(struct pcmcia_socket *skt)
 157 {
 158         module_put(skt->owner);
 159         put_device(&skt->dev);
 160 }
 161 EXPORT_SYMBOL(pcmcia_put_socket);
 162
 163
 164 static void pcmcia_release_socket(struct device *dev)
 165 {
 166         struct pcmcia_socket *socket = dev_get_drvdata(dev);
 167
 168         complete(&socket->socket_released);
 169 }
 170
 171 static int pccardd(void *__skt);
 172
 173 /**
 174  * pcmcia_register_socket - add a new pcmcia socket device
 175  * @socket: the &socket to register
 176  */
 177 int pcmcia_register_socket(struct pcmcia_socket *socket)
 178 {
 179         struct task_struct *tsk;
 180         int ret;
 181
 182         if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
 183                 return -EINVAL;
 184
 185         cs_dbg(socket, 0, "pcmcia_register_socket(0x%p)\n", socket->ops);
 186
 187         spin_lock_init(&socket->lock);
 188
 189         if (socket->resource_ops->init) {
 190                 ret = socket->resource_ops->init(socket);
 191                 if (ret)
 192                         return (ret);
 193         }
 194
 195         /* try to obtain a socket number [yes, it gets ugly if we
 196          * register more than 2^sizeof(unsigned int) pcmcia
 197          * sockets... but the socket number is deprecated
 198          * anyways, so I don't care] */
 199         down_write(&pcmcia_socket_list_rwsem);
 200         if (list_empty(&pcmcia_socket_list))
 201                 socket->sock = 0;
 202         else {
 203                 unsigned int found, i = 1;
 204                 struct pcmcia_socket *tmp;
 205                 do {
 206                         found = 1;
 207                         list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
 208                                 if (tmp->sock == i)
 209                                         found = 0;
 210                         }
 211                         i++;
 212                 } while (!found);
 213                 socket->sock = i - 1;
 214         }
 215         list_add_tail(&socket->socket_list, &pcmcia_socket_list);
 216         up_write(&pcmcia_socket_list_rwsem);
 217
 218 #ifndef CONFIG_CARDBUS
 219         /*
 220          * If we do not support Cardbus, ensure that
 221          * the Cardbus socket capability is disabled.
 222          */
 223         socket->features &= ~SS_CAP_CARDBUS;
 224 #endif
 225
 226         /* set proper values in socket->dev */
 227         dev_set_drvdata(&socket->dev, socket);
 228         socket->dev.class = &pcmcia_socket_class;
 229         snprintf(socket->dev.bus_id, BUS_ID_SIZE, "pcmcia_socket%u", socket->sock);
 230
 231         /* base address = 0, map = 0 */
 232         socket->cis_mem.flags = 0;
 233         socket->cis_mem.speed = cis_speed;
 234
 235         INIT_LIST_HEAD(&socket->cis_cache);
 236
 237         init_completion(&socket->socket_released);
 238         init_completion(&socket->thread_done);
 239         mutex_init(&socket->skt_mutex);
 240         spin_lock_init(&socket->thread_lock);
 241
 242         tsk = kthread_run(pccardd, socket, "pccardd");
 243         if (IS_ERR(tsk)) {
 244                 ret = PTR_ERR(tsk);
 245                 goto err;
 246         }
 247
 248         wait_for_completion(&socket->thread_done);
 249         if (!socket->thread) {
 250                 printk(KERN_WARNING "PCMCIA: warning: socket thread for socket %p did not start\n", socket);
 251                 return -EIO;
 252         }
 253
 254         pcmcia_parse_events(socket, SS_DETECT);
 255
 256         return 0;
 257
 258  err:
 259         down_write(&pcmcia_socket_list_rwsem);
 260         list_del(&socket->socket_list);
 261         up_write(&pcmcia_socket_list_rwsem);
 262         return ret;
 263 } /* pcmcia_register_socket */
 264 EXPORT_SYMBOL(pcmcia_register_socket);
 265
 266
 267 /**
 268  * pcmcia_unregister_socket - remove a pcmcia socket device
 269  * @socket: the &socket to unregister
 270  */
 271 void pcmcia_unregister_socket(struct pcmcia_socket *socket)
 272 {
 273         if (!socket)
 274                 return;
 275
 276         cs_dbg(socket, 0, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
 277
 278         if (socket->thread)
 279                 kthread_stop(socket->thread);
 280
 281         release_cis_mem(socket);
 282
 283         /* remove from our own list */
 284         down_write(&pcmcia_socket_list_rwsem);
 285         list_del(&socket->socket_list);
 286         up_write(&pcmcia_socket_list_rwsem);
 287
 288         /* wait for sysfs to drop all references */
 289         release_resource_db(socket);
 290         wait_for_completion(&socket->socket_released);
 291 } /* pcmcia_unregister_socket */
 292 EXPORT_SYMBOL(pcmcia_unregister_socket);
 293
 294
 295 struct pcmcia_socket * pcmcia_get_socket_by_nr(unsigned int nr)
 296 {
 297         struct pcmcia_socket *s;
 298
 299         down_read(&pcmcia_socket_list_rwsem);
 300         list_for_each_entry(s, &pcmcia_socket_list, socket_list)
 301                 if (s->sock == nr) {
 302                         up_read(&pcmcia_socket_list_rwsem);
 303                         return s;
 304                 }
 305         up_read(&pcmcia_socket_list_rwsem);
 306
 307         return NULL;
 308
 309 }
 310 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
 311
 312 /*
 313  * The central event handler.  Send_event() sends an event to the
 314  * 16-bit subsystem, which then calls the relevant device drivers.
 315  * Parse_events() interprets the event bits from
 316  * a card status change report.  Do_shutdown() handles the high
 317  * priority stuff associated with a card removal.
 318  */
 319
 320 /* NOTE: send_event needs to be called with skt->sem held. */
 321
 322 static int send_event(struct pcmcia_socket *s, event_t event, int priority)
 323 {
 324         int ret;
 325
 326         if (s->state & SOCKET_CARDBUS)
 327                 return 0;
 328
 329         cs_dbg(s, 1, "send_event(event %d, pri %d, callback 0x%p)\n",
 330            event, priority, s->callback);
 331
 332         if (!s->callback)
 333                 return 0;
 334         if (!try_module_get(s->callback->owner))
 335                 return 0;
 336
 337         ret = s->callback->event(s, event, priority);
 338
 339         module_put(s->callback->owner);
 340
 341         return ret;
 342 }
 343
 344 static void socket_remove_drivers(struct pcmcia_socket *skt)
 345 {
 346         cs_dbg(skt, 4, "remove_drivers\n");
 347
 348         send_event(skt, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
 349 }
 350
 351 static int socket_reset(struct pcmcia_socket *skt)
 352 {
 353         int status, i;
 354
 355         cs_dbg(skt, 4, "reset\n");
 356
 357         skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
 358         skt->ops->set_socket(skt, &skt->socket);
 359         udelay((long)reset_time);
 360
 361         skt->socket.flags &= ~SS_RESET;
 362         skt->ops->set_socket(skt, &skt->socket);
 363
 364         msleep(unreset_delay * 10);
 365         for (i = 0; i < unreset_limit; i++) {
 366                 skt->ops->get_status(skt, &status);
 367
 368                 if (!(status & SS_DETECT))
 369                         return CS_NO_CARD;
 370
 371                 if (status & SS_READY)
 372                         return CS_SUCCESS;
 373
 374                 msleep(unreset_check * 10);
 375         }
 376
 377         cs_err(skt, "time out after reset.\n");
 378         return CS_GENERAL_FAILURE;
 379 }
 380
 381 /*
 382  * socket_setup() and socket_shutdown() are called by the main event handler
 383  * when card insertion and removal events are received.
 384  * socket_setup() turns on socket power and resets the socket, in two stages.
 385  * socket_shutdown() unconfigures a socket and turns off socket power.
 386  */
 387 static void socket_shutdown(struct pcmcia_socket *s)
 388 {
 389         int status;
 390
 391         cs_dbg(s, 4, "shutdown\n");
 392
 393         socket_remove_drivers(s);
 394         s->state &= SOCKET_INUSE | SOCKET_PRESENT;
 395         msleep(shutdown_delay * 10);
 396         s->state &= SOCKET_INUSE;
 397
 398         /* Blank out the socket state */
 399         s->socket = dead_socket;
 400         s->ops->init(s);
 401         s->ops->set_socket(s, &s->socket);
 402         s->irq.AssignedIRQ = s->irq.Config = 0;
 403         s->lock_count = 0;
 404         destroy_cis_cache(s);
 405 #ifdef CONFIG_CARDBUS
 406         cb_free(s);
 407 #endif
 408         s->functions = 0;
 409
 410         /* give socket some time to power down */
 411         msleep(100);
 412
 413         s->ops->get_status(s, &status);
 414         if (status & SS_POWERON) {
 415                 printk(KERN_ERR "PCMCIA: socket %p: *** DANGER *** unable to remove socket power\n", s);
 416         }
 417
 418         cs_socket_put(s);
 419 }
 420
 421 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
 422 {
 423         int status, i;
 424
 425         cs_dbg(skt, 4, "setup\n");
 426
 427         skt->ops->get_status(skt, &status);
 428         if (!(status & SS_DETECT))
 429                 return CS_NO_CARD;
 430
 431         msleep(initial_delay * 10);
 432
 433         for (i = 0; i < 100; i++) {
 434                 skt->ops->get_status(skt, &status);
 435                 if (!(status & SS_DETECT))
 436                         return CS_NO_CARD;
 437
 438                 if (!(status & SS_PENDING))
 439                         break;
 440
 441                 msleep(100);
 442         }
 443
 444         if (status & SS_PENDING) {
 445                 cs_err(skt, "voltage interrogation timed out.\n");
 446                 return CS_GENERAL_FAILURE;
 447         }
 448
 449         if (status & SS_CARDBUS) {
 450                 if (!(skt->features & SS_CAP_CARDBUS)) {
 451                         cs_err(skt, "cardbus cards are not supported.\n");
 452                         return CS_BAD_TYPE;
 453                 }
 454                 skt->state |= SOCKET_CARDBUS;
 455         }
 456
 457         /*
 458          * Decode the card voltage requirements, and apply power to the card.
 459          */
 460         if (status & SS_3VCARD)
 461                 skt->socket.Vcc = skt->socket.Vpp = 33;
 462         else if (!(status & SS_XVCARD))
 463                 skt->socket.Vcc = skt->socket.Vpp = 50;
 464         else {
 465                 cs_err(skt, "unsupported voltage key.\n");
 466                 return CS_BAD_TYPE;
 467         }
 468
 469         if (skt->power_hook)
 470                 skt->power_hook(skt, HOOK_POWER_PRE);
 471
 472         skt->socket.flags = 0;
 473         skt->ops->set_socket(skt, &skt->socket);
 474
 475         /*
 476          * Wait "vcc_settle" for the supply to stabilise.
 477          */
 478         msleep(vcc_settle * 10);
 479
 480         skt->ops->get_status(skt, &status);
 481         if (!(status & SS_POWERON)) {
 482                 cs_err(skt, "unable to apply power.\n");
 483                 return CS_BAD_TYPE;
 484         }
 485
 486         status = socket_reset(skt);
 487
 488         if (skt->power_hook)
 489                 skt->power_hook(skt, HOOK_POWER_POST);
 490
 491         return status;
 492 }
 493
 494 /*
 495  * Handle card insertion.  Setup the socket, reset the card,
 496  * and then tell the rest of PCMCIA that a card is present.
 497  */
 498 static int socket_insert(struct pcmcia_socket *skt)
 499 {
 500         int ret;
 501
 502         cs_dbg(skt, 4, "insert\n");
 503
 504         if (!cs_socket_get(skt))
 505                 return CS_NO_CARD;
 506
 507         ret = socket_setup(skt, setup_delay);
 508         if (ret == CS_SUCCESS) {
 509                 skt->state |= SOCKET_PRESENT;
 510
 511                 printk(KERN_NOTICE "pccard: %s card inserted into slot %d\n",
 512                        (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
 513                        skt->sock);
 514
 515 #ifdef CONFIG_CARDBUS
 516                 if (skt->state & SOCKET_CARDBUS) {
 517                         cb_alloc(skt);
 518                         skt->state |= SOCKET_CARDBUS_CONFIG;
 519                 }
 520 #endif
 521                 cs_dbg(skt, 4, "insert done\n");
 522
 523                 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 524         } else {
 525                 socket_shutdown(skt);
 526         }
 527
 528         return ret;
 529 }
 530
 531 static int socket_suspend(struct pcmcia_socket *skt)
 532 {
 533         if (skt->state & SOCKET_SUSPEND)
 534                 return CS_IN_USE;
 535
 536         send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
 537         skt->socket = dead_socket;
 538         skt->ops->set_socket(skt, &skt->socket);
 539         if (skt->ops->suspend)
 540                 skt->ops->suspend(skt);
 541         skt->state |= SOCKET_SUSPEND;
 542
 543         return CS_SUCCESS;
 544 }
 545
 546 /*
 547  * Resume a socket.  If a card is present, verify its CIS against
 548  * our cached copy.  If they are different, the card has been
 549  * replaced, and we need to tell the drivers.
 550  */
 551 static int socket_resume(struct pcmcia_socket *skt)
 552 {
 553         int ret;
 554
 555         if (!(skt->state & SOCKET_SUSPEND))
 556                 return CS_IN_USE;
 557
 558         skt->socket = dead_socket;
 559         skt->ops->init(skt);
 560         skt->ops->set_socket(skt, &skt->socket);
 561
 562         if (!(skt->state & SOCKET_PRESENT)) {
 563                 skt->state &= ~SOCKET_SUSPEND;
 564                 return socket_insert(skt);
 565         }
 566
 567         ret = socket_setup(skt, resume_delay);
 568         if (ret == CS_SUCCESS) {
 569                 /*
 570                  * FIXME: need a better check here for cardbus cards.
 571                  */
 572                 if (verify_cis_cache(skt) != 0) {
 573                         cs_dbg(skt, 4, "cis mismatch - different card\n");
 574                         socket_remove_drivers(skt);
 575                         destroy_cis_cache(skt);
 576                         /*
 577                          * Workaround: give DS time to schedule removal.
 578                          * Remove me once the 100ms delay is eliminated
 579                          * in ds.c
 580                          */
 581                         msleep(200);
 582                         send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 583                 } else {
 584                         cs_dbg(skt, 4, "cis matches cache\n");
 585                         send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
 586                 }
 587         } else {
 588                 socket_shutdown(skt);
 589         }
 590
 591         skt->state &= ~SOCKET_SUSPEND;
 592
 593         return CS_SUCCESS;
 594 }
 595
 596 static void socket_remove(struct pcmcia_socket *skt)
 597 {
 598         printk(KERN_NOTICE "pccard: card ejected from slot %d\n", skt->sock);
 599         socket_shutdown(skt);
 600 }
 601
 602 /*
 603  * Process a socket card detect status change.
 604  *
 605  * If we don't have a card already present, delay the detect event for
 606  * about 20ms (to be on the safe side) before reading the socket status.
 607  *
 608  * Some i82365-based systems send multiple SS_DETECT events during card
 609  * insertion, and the "card present" status bit seems to bounce.  This
 610  * will probably be true with GPIO-based card detection systems after
 611  * the product has aged.
 612  */
 613 static void socket_detect_change(struct pcmcia_socket *skt)
 614 {
 615         if (!(skt->state & SOCKET_SUSPEND)) {
 616                 int status;
 617
 618                 if (!(skt->state & SOCKET_PRESENT))
 619                         msleep(20);
 620
 621                 skt->ops->get_status(skt, &status);
 622                 if ((skt->state & SOCKET_PRESENT) &&
 623                      !(status & SS_DETECT))
 624                         socket_remove(skt);
 625                 if (!(skt->state & SOCKET_PRESENT) &&
 626                     (status & SS_DETECT))
 627                         socket_insert(skt);
 628         }
 629 }
 630
 631 static int pccardd(void *__skt)
 632 {
 633         struct pcmcia_socket *skt = __skt;
 634         int ret;
 635
 636         skt->thread = current;
 637         skt->socket = dead_socket;
 638         skt->ops->init(skt);
 639         skt->ops->set_socket(skt, &skt->socket);
 640
 641         /* register with the device core */
 642         ret = device_register(&skt->dev);
 643         if (ret) {
 644                 printk(KERN_WARNING "PCMCIA: unable to register socket 0x%p\n",
 645                         skt);
 646                 skt->thread = NULL;
 647                 complete(&skt->thread_done);
 648                 return 0;
 649         }
 650         ret = pccard_sysfs_add_socket(&skt->dev);
 651         if (ret)
 652                 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
 653
 654         complete(&skt->thread_done);
 655
 656         set_freezable();
 657         for (;;) {
 658                 unsigned long flags;
 659                 unsigned int events;
 660
 661                 set_current_state(TASK_INTERRUPTIBLE);
 662
 663                 spin_lock_irqsave(&skt->thread_lock, flags);
 664                 events = skt->thread_events;
 665                 skt->thread_events = 0;
 666                 spin_unlock_irqrestore(&skt->thread_lock, flags);
 667
 668                 if (events) {
 669                         mutex_lock(&skt->skt_mutex);
 670                         if (events & SS_DETECT)
 671                                 socket_detect_change(skt);
 672                         if (events & SS_BATDEAD)
 673                                 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
 674                         if (events & SS_BATWARN)
 675                                 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
 676                         if (events & SS_READY)
 677                                 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
 678                         mutex_unlock(&skt->skt_mutex);
 679                         continue;
 680                 }
 681
 682                 if (kthread_should_stop())
 683                         break;
 684
 685                 schedule();
 686                 try_to_freeze();
 687         }
 688         /* make sure we are running before we exit */
 689         set_current_state(TASK_RUNNING);
 690
 691         /* remove from the device core */
 692         pccard_sysfs_remove_socket(&skt->dev);
 693         device_unregister(&skt->dev);
 694
 695         return 0;
 696 }
 697
 698 /*
 699  * Yenta (at least) probes interrupts before registering the socket and
 700  * starting the handler thread.
 701  */
 702 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
 703 {
 704         unsigned long flags;
 705         cs_dbg(s, 4, "parse_events: events %08x\n", events);
 706         if (s->thread) {
 707                 spin_lock_irqsave(&s->thread_lock, flags);
 708                 s->thread_events |= events;
 709                 spin_unlock_irqrestore(&s->thread_lock, flags);
 710
 711                 wake_up_process(s->thread);
 712         }
 713 } /* pcmcia_parse_events */
 714 EXPORT_SYMBOL(pcmcia_parse_events);
 715
 716
 717 /* register pcmcia_callback */
 718 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
 719 {
 720         int ret = 0;
 721
 722         /* s->skt_mutex also protects s->callback */
 723         mutex_lock(&s->skt_mutex);
 724
 725         if (c) {
 726                 /* registration */
 727                 if (s->callback) {
 728                         ret = -EBUSY;
 729                         goto err;
 730                 }
 731
 732                 s->callback = c;
 733
 734                 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
 735                         send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 736         } else
 737                 s->callback = NULL;
 738  err:
 739         mutex_unlock(&s->skt_mutex);
 740
 741         return ret;
 742 }
 743 EXPORT_SYMBOL(pccard_register_pcmcia);
 744
 745
 746 /* I'm not sure which "reset" function this is supposed to use,
 747  * but for now, it uses the low-level interface's reset, not the
 748  * CIS register.
 749  */
 750
 751 int pccard_reset_card(struct pcmcia_socket *skt)
 752 {
 753         int ret;
 754
 755         cs_dbg(skt, 1, "resetting socket\n");
 756
 757         mutex_lock(&skt->skt_mutex);
 758         do {
 759                 if (!(skt->state & SOCKET_PRESENT)) {
 760                         ret = CS_NO_CARD;
 761                         break;
 762                 }
 763                 if (skt->state & SOCKET_SUSPEND) {
 764                         ret = CS_IN_USE;
 765                         break;
 766                 }
 767                 if (skt->state & SOCKET_CARDBUS) {
 768                         ret = CS_UNSUPPORTED_FUNCTION;
 769                         break;
 770                 }
 771
 772                 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW);
 773                 if (ret == 0) {
 774                         send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
 775                         if (skt->callback)
 776                                 skt->callback->suspend(skt);
 777                         if (socket_reset(skt) == CS_SUCCESS) {
 778                                 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
 779                                 if (skt->callback)
 780                                         skt->callback->resume(skt);
 781                         }
 782                 }
 783
 784                 ret = CS_SUCCESS;
 785         } while (0);
 786         mutex_unlock(&skt->skt_mutex);
 787
 788         return ret;
 789 } /* reset_card */
 790 EXPORT_SYMBOL(pccard_reset_card);
 791
 792
 793 /* These shut down or wake up a socket.  They are sort of user
 794  * initiated versions of the APM suspend and resume actions.
 795  */
 796 int pcmcia_suspend_card(struct pcmcia_socket *skt)
 797 {
 798         int ret;
 799
 800         cs_dbg(skt, 1, "suspending socket\n");
 801
 802         mutex_lock(&skt->skt_mutex);
 803         do {
 804                 if (!(skt->state & SOCKET_PRESENT)) {
 805                         ret = CS_NO_CARD;
 806                         break;
 807                 }
 808                 if (skt->state & SOCKET_CARDBUS) {
 809                         ret = CS_UNSUPPORTED_FUNCTION;
 810                         break;
 811                 }
 812                 if (skt->callback) {
 813                         ret = skt->callback->suspend(skt);
 814                         if (ret)
 815                                 break;
 816                 }
 817                 ret = socket_suspend(skt);
 818         } while (0);
 819         mutex_unlock(&skt->skt_mutex);
 820
 821         return ret;
 822 } /* suspend_card */
 823 EXPORT_SYMBOL(pcmcia_suspend_card);
 824
 825
 826 int pcmcia_resume_card(struct pcmcia_socket *skt)
 827 {
 828         int ret;
 829
 830         cs_dbg(skt, 1, "waking up socket\n");
 831
 832         mutex_lock(&skt->skt_mutex);
 833         do {
 834                 if (!(skt->state & SOCKET_PRESENT)) {
 835                         ret = CS_NO_CARD;
 836                         break;
 837                 }
 838                 if (skt->state & SOCKET_CARDBUS) {
 839                         ret = CS_UNSUPPORTED_FUNCTION;
 840                         break;
 841                 }
 842                 ret = socket_resume(skt);
 843                 if (!ret && skt->callback)
 844                         skt->callback->resume(skt);
 845         } while (0);
 846         mutex_unlock(&skt->skt_mutex);
 847
 848         return ret;
 849 } /* resume_card */
 850 EXPORT_SYMBOL(pcmcia_resume_card);
 851
 852
 853 /* These handle user requests to eject or insert a card. */
 854 int pcmcia_eject_card(struct pcmcia_socket *skt)
 855 {
 856         int ret;
 857
 858         cs_dbg(skt, 1, "user eject request\n");
 859
 860         mutex_lock(&skt->skt_mutex);
 861         do {
 862                 if (!(skt->state & SOCKET_PRESENT)) {
 863                         ret = -ENODEV;
 864                         break;
 865                 }
 866
 867                 ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW);
 868                 if (ret != 0) {
 869                         ret = -EINVAL;
 870                         break;
 871                 }
 872
 873                 socket_remove(skt);
 874                 ret = 0;
 875         } while (0);
 876         mutex_unlock(&skt->skt_mutex);
 877
 878         return ret;
 879 } /* eject_card */
 880 EXPORT_SYMBOL(pcmcia_eject_card);
 881
 882
 883 int pcmcia_insert_card(struct pcmcia_socket *skt)
 884 {
 885         int ret;
 886
 887         cs_dbg(skt, 1, "user insert request\n");
 888
 889         mutex_lock(&skt->skt_mutex);
 890         do {
 891                 if (skt->state & SOCKET_PRESENT) {
 892                         ret = -EBUSY;
 893                         break;
 894                 }
 895                 if (socket_insert(skt) == CS_NO_CARD) {
 896                         ret = -ENODEV;
 897                         break;
 898                 }
 899                 ret = 0;
 900         } while (0);
 901         mutex_unlock(&skt->skt_mutex);
 902
 903         return ret;
 904 } /* insert_card */
 905 EXPORT_SYMBOL(pcmcia_insert_card);
 906
 907
 908 static int pcmcia_socket_uevent(struct device *dev,
 909                                 struct kobj_uevent_env *env)
 910 {
 911         struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 912
 913         if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
 914                 return -ENOMEM;
 915
 916         return 0;
 917 }
 918
 919
 920 static struct completion pcmcia_unload;
 921
 922 static void pcmcia_release_socket_class(struct class *data)
 923 {
 924         complete(&pcmcia_unload);
 925 }
 926
 927
 928 struct class pcmcia_socket_class = {
 929         .name = "pcmcia_socket",
 930         .dev_uevent = pcmcia_socket_uevent,
 931         .dev_release = pcmcia_release_socket,
 932         .class_release = pcmcia_release_socket_class,
 933 };
 934 EXPORT_SYMBOL(pcmcia_socket_class);
 935
 936
 937 static int __init init_pcmcia_cs(void)
 938 {
 939         init_completion(&pcmcia_unload);
 940         return class_register(&pcmcia_socket_class);
 941 }
 942
 943 static void __exit exit_pcmcia_cs(void)
 944 {
 945         class_unregister(&pcmcia_socket_class);
 946         wait_for_completion(&pcmcia_unload);
 947 }
 948
 949 subsys_initcall(init_pcmcia_cs);
 950 module_exit(exit_pcmcia_cs);
 951