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/pci.h>
  30 #include <linux/device.h>
  31 #include <asm/system.h>
  32 #include <asm/irq.h>
  33
  34 #define IN_CARD_SERVICES
  35 #include <pcmcia/cs_types.h>
  36 #include <pcmcia/ss.h>
  37 #include <pcmcia/cs.h>
  38 #include <pcmcia/bulkmem.h>
  39 #include <pcmcia/cistpl.h>
  40 #include <pcmcia/cisreg.h>
  41 #include <pcmcia/ds.h>
  42 #include "cs_internal.h"
  43
  44
  45 /* Module parameters */
  46
  47 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
  48 MODULE_DESCRIPTION("Linux Kernel Card Services");
  49 MODULE_LICENSE("GPL");
  50
  51 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
  52
  53 INT_MODULE_PARM(setup_delay,    10);            /* centiseconds */
  54 INT_MODULE_PARM(resume_delay,   20);            /* centiseconds */
  55 INT_MODULE_PARM(shutdown_delay, 3);             /* centiseconds */
  56 INT_MODULE_PARM(vcc_settle,     40);            /* centiseconds */
  57 INT_MODULE_PARM(reset_time,     10);            /* usecs */
  58 INT_MODULE_PARM(unreset_delay,  10);            /* centiseconds */
  59 INT_MODULE_PARM(unreset_check,  10);            /* centiseconds */
  60 INT_MODULE_PARM(unreset_limit,  30);            /* unreset_check's */
  61
  62 /* Access speed for attribute memory windows */
  63 INT_MODULE_PARM(cis_speed,      300);           /* ns */
  64
  65 #ifdef DEBUG
  66 static int pc_debug;
  67
  68 module_param(pc_debug, int, 0644);
  69
  70 int cs_debug_level(int level)
  71 {
  72         return pc_debug > level;
  73 }
  74 #endif
  75
  76
  77 socket_state_t dead_socket = {
  78         .csc_mask       = SS_DETECT,
  79 };
  80 EXPORT_SYMBOL(dead_socket);
  81
  82
  83 /* List of all sockets, protected by a rwsem */
  84 LIST_HEAD(pcmcia_socket_list);
  85 EXPORT_SYMBOL(pcmcia_socket_list);
  86
  87 DECLARE_RWSEM(pcmcia_socket_list_rwsem);
  88 EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
  89
  90
  91 /**
  92  * Low-level PCMCIA socket drivers need to register with the PCCard
  93  * core using pcmcia_register_socket.
  94  *
  95  * socket drivers are expected to use the following callbacks in their
  96  * .drv struct:
  97  *  - pcmcia_socket_dev_suspend
  98  *  - pcmcia_socket_dev_resume
  99  * These functions check for the appropriate struct pcmcia_soket arrays,
 100  * and pass them to the low-level functions pcmcia_{suspend,resume}_socket
 101  */
 102 static int socket_resume(struct pcmcia_socket *skt);
 103 static int socket_suspend(struct pcmcia_socket *skt);
 104
 105 int pcmcia_socket_dev_suspend(struct device *dev, pm_message_t state)
 106 {
 107         struct pcmcia_socket *socket;
 108
 109         down_read(&pcmcia_socket_list_rwsem);
 110         list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
 111                 if (socket->dev.dev != dev)
 112                         continue;
 113                 mutex_lock(&socket->skt_mutex);
 114                 socket_suspend(socket);
 115                 mutex_unlock(&socket->skt_mutex);
 116         }
 117         up_read(&pcmcia_socket_list_rwsem);
 118
 119         return 0;
 120 }
 121 EXPORT_SYMBOL(pcmcia_socket_dev_suspend);
 122
 123 int pcmcia_socket_dev_resume(struct device *dev)
 124 {
 125         struct pcmcia_socket *socket;
 126
 127         down_read(&pcmcia_socket_list_rwsem);
 128         list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
 129                 if (socket->dev.dev != dev)
 130                         continue;
 131                 mutex_lock(&socket->skt_mutex);
 132                 socket_resume(socket);
 133                 mutex_unlock(&socket->skt_mutex);
 134         }
 135         up_read(&pcmcia_socket_list_rwsem);
 136
 137         return 0;
 138 }
 139 EXPORT_SYMBOL(pcmcia_socket_dev_resume);
 140
 141
 142 struct pcmcia_socket * pcmcia_get_socket(struct pcmcia_socket *skt)
 143 {
 144         struct class_device *cl_dev = class_device_get(&skt->dev);
 145         if (!cl_dev)
 146                 return NULL;
 147         skt = class_get_devdata(cl_dev);
 148         if (!try_module_get(skt->owner)) {
 149                 class_device_put(&skt->dev);
 150                 return NULL;
 151         }
 152         return (skt);
 153 }
 154 EXPORT_SYMBOL(pcmcia_get_socket);
 155
 156
 157 void pcmcia_put_socket(struct pcmcia_socket *skt)
 158 {
 159         module_put(skt->owner);
 160         class_device_put(&skt->dev);
 161 }
 162 EXPORT_SYMBOL(pcmcia_put_socket);
 163
 164
 165 static void pcmcia_release_socket(struct class_device *class_dev)
 166 {
 167         struct pcmcia_socket *socket = class_get_devdata(class_dev);
 168
 169         complete(&socket->socket_released);
 170 }
 171
 172 static int pccardd(void *__skt);
 173
 174 /**
 175  * pcmcia_register_socket - add a new pcmcia socket device
 176  */
 177 int pcmcia_register_socket(struct pcmcia_socket *socket)
 178 {
 179         int ret;
 180
 181         if (!socket || !socket->ops || !socket->dev.dev || !socket->resource_ops)
 182                 return -EINVAL;
 183
 184         cs_dbg(socket, 0, "pcmcia_register_socket(0x%p)\n", socket->ops);
 185
 186         spin_lock_init(&socket->lock);
 187
 188         if (socket->resource_ops->init) {
 189                 ret = socket->resource_ops->init(socket);
 190                 if (ret)
 191                         return (ret);
 192         }
 193
 194         /* try to obtain a socket number [yes, it gets ugly if we
 195          * register more than 2^sizeof(unsigned int) pcmcia
 196          * sockets... but the socket number is deprecated
 197          * anyways, so I don't care] */
 198         down_write(&pcmcia_socket_list_rwsem);
 199         if (list_empty(&pcmcia_socket_list))
 200                 socket->sock = 0;
 201         else {
 202                 unsigned int found, i = 1;
 203                 struct pcmcia_socket *tmp;
 204                 do {
 205                         found = 1;
 206                         list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
 207                                 if (tmp->sock == i)
 208                                         found = 0;
 209                         }
 210                         i++;
 211                 } while (!found);
 212                 socket->sock = i - 1;
 213         }
 214         list_add_tail(&socket->socket_list, &pcmcia_socket_list);
 215         up_write(&pcmcia_socket_list_rwsem);
 216
 217 #ifndef CONFIG_CARDBUS
 218         /*
 219          * If we do not support Cardbus, ensure that
 220          * the Cardbus socket capability is disabled.
 221          */
 222         socket->features &= ~SS_CAP_CARDBUS;
 223 #endif
 224
 225         /* set proper values in socket->dev */
 226         socket->dev.class_data = socket;
 227         socket->dev.class = &pcmcia_socket_class;
 228         snprintf(socket->dev.class_id, BUS_ID_SIZE, "pcmcia_socket%u", socket->sock);
 229
 230         /* base address = 0, map = 0 */
 231         socket->cis_mem.flags = 0;
 232         socket->cis_mem.speed = cis_speed;
 233
 234         INIT_LIST_HEAD(&socket->cis_cache);
 235
 236         init_completion(&socket->socket_released);
 237         init_completion(&socket->thread_done);
 238         init_waitqueue_head(&socket->thread_wait);
 239         mutex_init(&socket->skt_mutex);
 240         spin_lock_init(&socket->thread_lock);
 241
 242         ret = kernel_thread(pccardd, socket, CLONE_KERNEL);
 243         if (ret < 0)
 244                 goto err;
 245
 246         wait_for_completion(&socket->thread_done);
 247         if(!socket->thread) {
 248                 printk(KERN_WARNING "PCMCIA: warning: socket thread for socket %p did not start\n", socket);
 249                 return -EIO;
 250         }
 251         pcmcia_parse_events(socket, SS_DETECT);
 252
 253         return 0;
 254
 255  err:
 256         down_write(&pcmcia_socket_list_rwsem);
 257         list_del(&socket->socket_list);
 258         up_write(&pcmcia_socket_list_rwsem);
 259         return ret;
 260 } /* pcmcia_register_socket */
 261 EXPORT_SYMBOL(pcmcia_register_socket);
 262
 263
 264 /**
 265  * pcmcia_unregister_socket - remove a pcmcia socket device
 266  */
 267 void pcmcia_unregister_socket(struct pcmcia_socket *socket)
 268 {
 269         if (!socket)
 270                 return;
 271
 272         cs_dbg(socket, 0, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
 273
 274         if (socket->thread) {
 275                 init_completion(&socket->thread_done);
 276                 socket->thread = NULL;
 277                 wake_up(&socket->thread_wait);
 278                 wait_for_completion(&socket->thread_done);
 279         }
 280         release_cis_mem(socket);
 281
 282         /* remove from our own list */
 283         down_write(&pcmcia_socket_list_rwsem);
 284         list_del(&socket->socket_list);
 285         up_write(&pcmcia_socket_list_rwsem);
 286
 287         /* wait for sysfs to drop all references */
 288         release_resource_db(socket);
 289         wait_for_completion(&socket->socket_released);
 290 } /* pcmcia_unregister_socket */
 291 EXPORT_SYMBOL(pcmcia_unregister_socket);
 292
 293
 294 struct pcmcia_socket * pcmcia_get_socket_by_nr(unsigned int nr)
 295 {
 296         struct pcmcia_socket *s;
 297
 298         down_read(&pcmcia_socket_list_rwsem);
 299         list_for_each_entry(s, &pcmcia_socket_list, socket_list)
 300                 if (s->sock == nr) {
 301                         up_read(&pcmcia_socket_list_rwsem);
 302                         return s;
 303                 }
 304         up_read(&pcmcia_socket_list_rwsem);
 305
 306         return NULL;
 307
 308 }
 309 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
 310
 311 /**
 312  * The central event handler.  Send_event() sends an event to the
 313  * 16-bit subsystem, which then calls the relevant device drivers.
 314  * Parse_events() interprets the event bits from
 315  * a card status change report.  Do_shutdown() handles the high
 316  * priority stuff associated with a card removal.
 317  */
 318
 319 /* NOTE: send_event needs to be called with skt->sem held. */
 320
 321 static int send_event(struct pcmcia_socket *s, event_t event, int priority)
 322 {
 323         int ret;
 324
 325         if (s->state & SOCKET_CARDBUS)
 326                 return 0;
 327
 328         cs_dbg(s, 1, "send_event(event %d, pri %d, callback 0x%p)\n",
 329            event, priority, s->callback);
 330
 331         if (!s->callback)
 332                 return 0;
 333         if (!try_module_get(s->callback->owner))
 334                 return 0;
 335
 336         ret = s->callback->event(s, event, priority);
 337
 338         module_put(s->callback->owner);
 339
 340         return ret;
 341 }
 342
 343 static void socket_remove_drivers(struct pcmcia_socket *skt)
 344 {
 345         cs_dbg(skt, 4, "remove_drivers\n");
 346
 347         send_event(skt, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
 348 }
 349
 350 static int socket_reset(struct pcmcia_socket *skt)
 351 {
 352         int status, i;
 353
 354         cs_dbg(skt, 4, "reset\n");
 355
 356         skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
 357         skt->ops->set_socket(skt, &skt->socket);
 358         udelay((long)reset_time);
 359
 360         skt->socket.flags &= ~SS_RESET;
 361         skt->ops->set_socket(skt, &skt->socket);
 362
 363         msleep(unreset_delay * 10);
 364         for (i = 0; i < unreset_limit; i++) {
 365                 skt->ops->get_status(skt, &status);
 366
 367                 if (!(status & SS_DETECT))
 368                         return CS_NO_CARD;
 369
 370                 if (status & SS_READY)
 371                         return CS_SUCCESS;
 372
 373                 msleep(unreset_check * 10);
 374         }
 375
 376         cs_err(skt, "time out after reset.\n");
 377         return CS_GENERAL_FAILURE;
 378 }
 379
 380 /**
 381  * socket_setup() and socket_shutdown() are called by the main event handler
 382  * when card insertion and removal events are received.
 383  * socket_setup() turns on socket power and resets the socket, in two stages.
 384  * socket_shutdown() unconfigures a socket and turns off socket power.
 385  */
 386 static void socket_shutdown(struct pcmcia_socket *s)
 387 {
 388         int status;
 389
 390         cs_dbg(s, 4, "shutdown\n");
 391
 392         socket_remove_drivers(s);
 393         s->state &= SOCKET_INUSE | SOCKET_PRESENT;
 394         msleep(shutdown_delay * 10);
 395         s->state &= SOCKET_INUSE;
 396
 397         /* Blank out the socket state */
 398         s->socket = dead_socket;
 399         s->ops->init(s);
 400         s->ops->set_socket(s, &s->socket);
 401         s->irq.AssignedIRQ = s->irq.Config = 0;
 402         s->lock_count = 0;
 403         destroy_cis_cache(s);
 404 #ifdef CONFIG_CARDBUS
 405         cb_free(s);
 406 #endif
 407         s->functions = 0;
 408
 409         s->ops->get_status(s, &status);
 410         if (status & SS_POWERON) {
 411                 printk(KERN_ERR "PCMCIA: socket %p: *** DANGER *** unable to remove socket power\n", s);
 412         }
 413
 414         cs_socket_put(s);
 415 }
 416
 417 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
 418 {
 419         int status, i;
 420
 421         cs_dbg(skt, 4, "setup\n");
 422
 423         skt->ops->get_status(skt, &status);
 424         if (!(status & SS_DETECT))
 425                 return CS_NO_CARD;
 426
 427         msleep(initial_delay * 10);
 428
 429         for (i = 0; i < 100; i++) {
 430                 skt->ops->get_status(skt, &status);
 431                 if (!(status & SS_DETECT))
 432                         return CS_NO_CARD;
 433
 434                 if (!(status & SS_PENDING))
 435                         break;
 436
 437                 msleep(100);
 438         }
 439
 440         if (status & SS_PENDING) {
 441                 cs_err(skt, "voltage interrogation timed out.\n");
 442                 return CS_GENERAL_FAILURE;
 443         }
 444
 445         if (status & SS_CARDBUS) {
 446                 if (!(skt->features & SS_CAP_CARDBUS)) {
 447                         cs_err(skt, "cardbus cards are not supported.\n");
 448                         return CS_BAD_TYPE;
 449                 }
 450                 skt->state |= SOCKET_CARDBUS;
 451         }
 452
 453         /*
 454          * Decode the card voltage requirements, and apply power to the card.
 455          */
 456         if (status & SS_3VCARD)
 457                 skt->socket.Vcc = skt->socket.Vpp = 33;
 458         else if (!(status & SS_XVCARD))
 459                 skt->socket.Vcc = skt->socket.Vpp = 50;
 460         else {
 461                 cs_err(skt, "unsupported voltage key.\n");
 462                 return CS_BAD_TYPE;
 463         }
 464
 465         if (skt->power_hook)
 466                 skt->power_hook(skt, HOOK_POWER_PRE);
 467
 468         skt->socket.flags = 0;
 469         skt->ops->set_socket(skt, &skt->socket);
 470
 471         /*
 472          * Wait "vcc_settle" for the supply to stabilise.
 473          */
 474         msleep(vcc_settle * 10);
 475
 476         skt->ops->get_status(skt, &status);
 477         if (!(status & SS_POWERON)) {
 478                 cs_err(skt, "unable to apply power.\n");
 479                 return CS_BAD_TYPE;
 480         }
 481
 482         status = socket_reset(skt);
 483
 484         if (skt->power_hook)
 485                 skt->power_hook(skt, HOOK_POWER_POST);
 486
 487         return status;
 488 }
 489
 490 /*
 491  * Handle card insertion.  Setup the socket, reset the card,
 492  * and then tell the rest of PCMCIA that a card is present.
 493  */
 494 static int socket_insert(struct pcmcia_socket *skt)
 495 {
 496         int ret;
 497
 498         cs_dbg(skt, 4, "insert\n");
 499
 500         if (!cs_socket_get(skt))
 501                 return CS_NO_CARD;
 502
 503         ret = socket_setup(skt, setup_delay);
 504         if (ret == CS_SUCCESS) {
 505                 skt->state |= SOCKET_PRESENT;
 506
 507                 printk(KERN_NOTICE "pccard: %s card inserted into slot %d\n",
 508                        (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
 509                        skt->sock);
 510
 511 #ifdef CONFIG_CARDBUS
 512                 if (skt->state & SOCKET_CARDBUS) {
 513                         cb_alloc(skt);
 514                         skt->state |= SOCKET_CARDBUS_CONFIG;
 515                 }
 516 #endif
 517                 cs_dbg(skt, 4, "insert done\n");
 518
 519                 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 520         } else {
 521                 socket_shutdown(skt);
 522         }
 523
 524         return ret;
 525 }
 526
 527 static int socket_suspend(struct pcmcia_socket *skt)
 528 {
 529         if (skt->state & SOCKET_SUSPEND)
 530                 return CS_IN_USE;
 531
 532         send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
 533         skt->socket = dead_socket;
 534         skt->ops->set_socket(skt, &skt->socket);
 535         if (skt->ops->suspend)
 536                 skt->ops->suspend(skt);
 537         skt->state |= SOCKET_SUSPEND;
 538
 539         return CS_SUCCESS;
 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 ret;
 550
 551         if (!(skt->state & SOCKET_SUSPEND))
 552                 return CS_IN_USE;
 553
 554         skt->socket = dead_socket;
 555         skt->ops->init(skt);
 556         skt->ops->set_socket(skt, &skt->socket);
 557
 558         if (!(skt->state & SOCKET_PRESENT)) {
 559                 skt->state &= ~SOCKET_SUSPEND;
 560                 return socket_insert(skt);
 561         }
 562
 563         ret = socket_setup(skt, resume_delay);
 564         if (ret == CS_SUCCESS) {
 565                 /*
 566                  * FIXME: need a better check here for cardbus cards.
 567                  */
 568                 if (verify_cis_cache(skt) != 0) {
 569                         cs_dbg(skt, 4, "cis mismatch - different card\n");
 570                         socket_remove_drivers(skt);
 571                         destroy_cis_cache(skt);
 572                         /*
 573                          * Workaround: give DS time to schedule removal.
 574                          * Remove me once the 100ms delay is eliminated
 575                          * in ds.c
 576                          */
 577                         msleep(200);
 578                         send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 579                 } else {
 580                         cs_dbg(skt, 4, "cis matches cache\n");
 581                         send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
 582                 }
 583         } else {
 584                 socket_shutdown(skt);
 585         }
 586
 587         skt->state &= ~SOCKET_SUSPEND;
 588
 589         return CS_SUCCESS;
 590 }
 591
 592 static void socket_remove(struct pcmcia_socket *skt)
 593 {
 594         printk(KERN_NOTICE "pccard: card ejected from slot %d\n", skt->sock);
 595         socket_shutdown(skt);
 596 }
 597
 598 /*
 599  * Process a socket card detect status change.
 600  *
 601  * If we don't have a card already present, delay the detect event for
 602  * about 20ms (to be on the safe side) before reading the socket status.
 603  *
 604  * Some i82365-based systems send multiple SS_DETECT events during card
 605  * insertion, and the "card present" status bit seems to bounce.  This
 606  * will probably be true with GPIO-based card detection systems after
 607  * the product has aged.
 608  */
 609 static void socket_detect_change(struct pcmcia_socket *skt)
 610 {
 611         if (!(skt->state & SOCKET_SUSPEND)) {
 612                 int status;
 613
 614                 if (!(skt->state & SOCKET_PRESENT))
 615                         msleep(20);
 616
 617                 skt->ops->get_status(skt, &status);
 618                 if ((skt->state & SOCKET_PRESENT) &&
 619                      !(status & SS_DETECT))
 620                         socket_remove(skt);
 621                 if (!(skt->state & SOCKET_PRESENT) &&
 622                     (status & SS_DETECT))
 623                         socket_insert(skt);
 624         }
 625 }
 626
 627 static int pccardd(void *__skt)
 628 {
 629         struct pcmcia_socket *skt = __skt;
 630         DECLARE_WAITQUEUE(wait, current);
 631         int ret;
 632
 633         daemonize("pccardd");
 634
 635         skt->thread = current;
 636         skt->socket = dead_socket;
 637         skt->ops->init(skt);
 638         skt->ops->set_socket(skt, &skt->socket);
 639
 640         /* register with the device core */
 641         ret = class_device_register(&skt->dev);
 642         if (ret) {
 643                 printk(KERN_WARNING "PCMCIA: unable to register socket 0x%p\n",
 644                         skt);
 645                 skt->thread = NULL;
 646                 complete_and_exit(&skt->thread_done, 0);
 647         }
 648
 649         add_wait_queue(&skt->thread_wait, &wait);
 650         complete(&skt->thread_done);
 651
 652         for (;;) {
 653                 unsigned long flags;
 654                 unsigned int events;
 655
 656                 set_current_state(TASK_INTERRUPTIBLE);
 657
 658                 spin_lock_irqsave(&skt->thread_lock, flags);
 659                 events = skt->thread_events;
 660                 skt->thread_events = 0;
 661                 spin_unlock_irqrestore(&skt->thread_lock, flags);
 662
 663                 if (events) {
 664                         mutex_lock(&skt->skt_mutex);
 665                         if (events & SS_DETECT)
 666                                 socket_detect_change(skt);
 667                         if (events & SS_BATDEAD)
 668                                 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
 669                         if (events & SS_BATWARN)
 670                                 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
 671                         if (events & SS_READY)
 672                                 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
 673                         mutex_unlock(&skt->skt_mutex);
 674                         continue;
 675                 }
 676
 677                 if (!skt->thread)
 678                         break;
 679
 680                 schedule();
 681                 try_to_freeze();
 682         }
 683         /* make sure we are running before we exit */
 684         set_current_state(TASK_RUNNING);
 685
 686         remove_wait_queue(&skt->thread_wait, &wait);
 687
 688         /* remove from the device core */
 689         class_device_unregister(&skt->dev);
 690
 691         complete_and_exit(&skt->thread_done, 0);
 692 }
 693
 694 /*
 695  * Yenta (at least) probes interrupts before registering the socket and
 696  * starting the handler thread.
 697  */
 698 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
 699 {
 700         cs_dbg(s, 4, "parse_events: events %08x\n", events);
 701         if (s->thread) {
 702                 spin_lock(&s->thread_lock);
 703                 s->thread_events |= events;
 704                 spin_unlock(&s->thread_lock);
 705
 706                 wake_up(&s->thread_wait);
 707         }
 708 } /* pcmcia_parse_events */
 709 EXPORT_SYMBOL(pcmcia_parse_events);
 710
 711
 712 /* register pcmcia_callback */
 713 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
 714 {
 715         int ret = 0;
 716
 717         /* s->skt_mutex also protects s->callback */
 718         mutex_lock(&s->skt_mutex);
 719
 720         if (c) {
 721                 /* registration */
 722                 if (s->callback) {
 723                         ret = -EBUSY;
 724                         goto err;
 725                 }
 726
 727                 s->callback = c;
 728
 729                 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
 730                         send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 731         } else
 732                 s->callback = NULL;
 733  err:
 734         mutex_unlock(&s->skt_mutex);
 735
 736         return ret;
 737 }
 738 EXPORT_SYMBOL(pccard_register_pcmcia);
 739
 740
 741 /* I'm not sure which "reset" function this is supposed to use,
 742  * but for now, it uses the low-level interface's reset, not the
 743  * CIS register.
 744  */
 745
 746 int pccard_reset_card(struct pcmcia_socket *skt)
 747 {
 748         int ret;
 749
 750         cs_dbg(skt, 1, "resetting socket\n");
 751
 752         mutex_lock(&skt->skt_mutex);
 753         do {
 754                 if (!(skt->state & SOCKET_PRESENT)) {
 755                         ret = CS_NO_CARD;
 756                         break;
 757                 }
 758                 if (skt->state & SOCKET_SUSPEND) {
 759                         ret = CS_IN_USE;
 760                         break;
 761                 }
 762                 if (skt->state & SOCKET_CARDBUS) {
 763                         ret = CS_UNSUPPORTED_FUNCTION;
 764                         break;
 765                 }
 766
 767                 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW);
 768                 if (ret == 0) {
 769                         send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
 770                         if (skt->callback)
 771                                 skt->callback->suspend(skt);
 772                         if (socket_reset(skt) == CS_SUCCESS) {
 773                                 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
 774                                 if (skt->callback)
 775                                         skt->callback->resume(skt);
 776                         }
 777                 }
 778
 779                 ret = CS_SUCCESS;
 780         } while (0);
 781         mutex_unlock(&skt->skt_mutex);
 782
 783         return ret;
 784 } /* reset_card */
 785 EXPORT_SYMBOL(pccard_reset_card);
 786
 787
 788 /* These shut down or wake up a socket.  They are sort of user
 789  * initiated versions of the APM suspend and resume actions.
 790  */
 791 int pcmcia_suspend_card(struct pcmcia_socket *skt)
 792 {
 793         int ret;
 794
 795         cs_dbg(skt, 1, "suspending socket\n");
 796
 797         mutex_lock(&skt->skt_mutex);
 798         do {
 799                 if (!(skt->state & SOCKET_PRESENT)) {
 800                         ret = CS_NO_CARD;
 801                         break;
 802                 }
 803                 if (skt->state & SOCKET_CARDBUS) {
 804                         ret = CS_UNSUPPORTED_FUNCTION;
 805                         break;
 806                 }
 807                 if (skt->callback) {
 808                         ret = skt->callback->suspend(skt);
 809                         if (ret)
 810                                 break;
 811                 }
 812                 ret = socket_suspend(skt);
 813         } while (0);
 814         mutex_unlock(&skt->skt_mutex);
 815
 816         return ret;
 817 } /* suspend_card */
 818 EXPORT_SYMBOL(pcmcia_suspend_card);
 819
 820
 821 int pcmcia_resume_card(struct pcmcia_socket *skt)
 822 {
 823         int ret;
 824
 825         cs_dbg(skt, 1, "waking up socket\n");
 826
 827         mutex_lock(&skt->skt_mutex);
 828         do {
 829                 if (!(skt->state & SOCKET_PRESENT)) {
 830                         ret = CS_NO_CARD;
 831                         break;
 832                 }
 833                 if (skt->state & SOCKET_CARDBUS) {
 834                         ret = CS_UNSUPPORTED_FUNCTION;
 835                         break;
 836                 }
 837                 ret = socket_resume(skt);
 838                 if (!ret && skt->callback)
 839                         skt->callback->resume(skt);
 840         } while (0);
 841         mutex_unlock(&skt->skt_mutex);
 842
 843         return ret;
 844 } /* resume_card */
 845 EXPORT_SYMBOL(pcmcia_resume_card);
 846
 847
 848 /* These handle user requests to eject or insert a card. */
 849 int pcmcia_eject_card(struct pcmcia_socket *skt)
 850 {
 851         int ret;
 852
 853         cs_dbg(skt, 1, "user eject request\n");
 854
 855         mutex_lock(&skt->skt_mutex);
 856         do {
 857                 if (!(skt->state & SOCKET_PRESENT)) {
 858                         ret = -ENODEV;
 859                         break;
 860                 }
 861
 862                 ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW);
 863                 if (ret != 0) {
 864                         ret = -EINVAL;
 865                         break;
 866                 }
 867
 868                 socket_remove(skt);
 869                 ret = 0;
 870         } while (0);
 871         mutex_unlock(&skt->skt_mutex);
 872
 873         return ret;
 874 } /* eject_card */
 875 EXPORT_SYMBOL(pcmcia_eject_card);
 876
 877
 878 int pcmcia_insert_card(struct pcmcia_socket *skt)
 879 {
 880         int ret;
 881
 882         cs_dbg(skt, 1, "user insert request\n");
 883
 884         mutex_lock(&skt->skt_mutex);
 885         do {
 886                 if (skt->state & SOCKET_PRESENT) {
 887                         ret = -EBUSY;
 888                         break;
 889                 }
 890                 if (socket_insert(skt) == CS_NO_CARD) {
 891                         ret = -ENODEV;
 892                         break;
 893                 }
 894                 ret = 0;
 895         } while (0);
 896         mutex_unlock(&skt->skt_mutex);
 897
 898         return ret;
 899 } /* insert_card */
 900 EXPORT_SYMBOL(pcmcia_insert_card);
 901
 902
 903 static int pcmcia_socket_uevent(struct class_device *dev, char **envp,
 904                                 int num_envp, char *buffer, int buffer_size)
 905 {
 906         struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 907         int i = 0, length = 0;
 908
 909         if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
 910                            &length, "SOCKET_NO=%u", s->sock))
 911                 return -ENOMEM;
 912
 913         envp[i] = NULL;
 914
 915         return 0;
 916 }
 917
 918
 919 static struct completion pcmcia_unload;
 920
 921 static void pcmcia_release_socket_class(struct class *data)
 922 {
 923         complete(&pcmcia_unload);
 924 }
 925
 926
 927 struct class pcmcia_socket_class = {
 928         .name = "pcmcia_socket",
 929         .uevent = pcmcia_socket_uevent,
 930         .release = pcmcia_release_socket,
 931         .class_release = pcmcia_release_socket_class,
 932 };
 933 EXPORT_SYMBOL(pcmcia_socket_class);
 934
 935
 936 static int __init init_pcmcia_cs(void)
 937 {
 938         int ret;
 939
 940         init_completion(&pcmcia_unload);
 941         ret = class_register(&pcmcia_socket_class);
 942         if (ret)
 943                 return (ret);
 944         return class_interface_register(&pccard_sysfs_interface);
 945 }
 946
 947 static void __exit exit_pcmcia_cs(void)
 948 {
 949         class_interface_unregister(&pccard_sysfs_interface);
 950         class_unregister(&pcmcia_socket_class);
 951
 952         wait_for_completion(&pcmcia_unload);
 953 }
 954
 955 subsys_initcall(init_pcmcia_cs);
 956 module_exit(exit_pcmcia_cs);
 957