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/config.h>
  20 #include <linux/string.h>
  21 #include <linux/major.h>
  22 #include <linux/errno.h>
  23 #include <linux/slab.h>
  24 #include <linux/mm.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/timer.h>
  27 #include <linux/ioport.h>
  28 #include <linux/delay.h>
  29 #include <linux/pm.h>
  30 #include <linux/pci.h>
  31 #include <linux/device.h>
  32 #include <asm/system.h>
  33 #include <asm/irq.h>
  34
  35 #define IN_CARD_SERVICES
  36 #include <pcmcia/cs_types.h>
  37 #include <pcmcia/ss.h>
  38 #include <pcmcia/cs.h>
  39 #include <pcmcia/bulkmem.h>
  40 #include <pcmcia/cistpl.h>
  41 #include <pcmcia/cisreg.h>
  42 #include <pcmcia/ds.h>
  43 #include "cs_internal.h"
  44
  45
  46 /* Module parameters */
  47
  48 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
  49 MODULE_DESCRIPTION("Linux Kernel Card Services");
  50 MODULE_LICENSE("GPL");
  51
  52 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
  53
  54 INT_MODULE_PARM(setup_delay,    10);            /* centiseconds */
  55 INT_MODULE_PARM(resume_delay,   20);            /* centiseconds */
  56 INT_MODULE_PARM(shutdown_delay, 3);             /* centiseconds */
  57 INT_MODULE_PARM(vcc_settle,     40);            /* centiseconds */
  58 INT_MODULE_PARM(reset_time,     10);            /* usecs */
  59 INT_MODULE_PARM(unreset_delay,  10);            /* centiseconds */
  60 INT_MODULE_PARM(unreset_check,  10);            /* centiseconds */
  61 INT_MODULE_PARM(unreset_limit,  30);            /* unreset_check's */
  62
  63 /* Access speed for attribute memory windows */
  64 INT_MODULE_PARM(cis_speed,      300);           /* ns */
  65
  66 #ifdef DEBUG
  67 static int pc_debug;
  68
  69 module_param(pc_debug, int, 0644);
  70
  71 int cs_debug_level(int level)
  72 {
  73         return pc_debug > level;
  74 }
  75 #endif
  76
  77
  78 socket_state_t dead_socket = {
  79         .csc_mask       = SS_DETECT,
  80 };
  81 EXPORT_SYMBOL(dead_socket);
  82
  83
  84 /* List of all sockets, protected by a rwsem */
  85 LIST_HEAD(pcmcia_socket_list);
  86 EXPORT_SYMBOL(pcmcia_socket_list);
  87
  88 DECLARE_RWSEM(pcmcia_socket_list_rwsem);
  89 EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
  90
  91
  92 /**
  93  * Low-level PCMCIA socket drivers need to register with the PCCard
  94  * core using pcmcia_register_socket.
  95  *
  96  * socket drivers are expected to use the following callbacks in their
  97  * .drv struct:
  98  *  - pcmcia_socket_dev_suspend
  99  *  - pcmcia_socket_dev_resume
 100  * These functions check for the appropriate struct pcmcia_soket arrays,
 101  * and pass them to the low-level functions pcmcia_{suspend,resume}_socket
 102  */
 103 static int socket_resume(struct pcmcia_socket *skt);
 104 static int socket_suspend(struct pcmcia_socket *skt);
 105
 106 int pcmcia_socket_dev_suspend(struct device *dev, pm_message_t state)
 107 {
 108         struct pcmcia_socket *socket;
 109
 110         down_read(&pcmcia_socket_list_rwsem);
 111         list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
 112                 if (socket->dev.dev != dev)
 113                         continue;
 114                 down(&socket->skt_sem);
 115                 socket_suspend(socket);
 116                 up(&socket->skt_sem);
 117         }
 118         up_read(&pcmcia_socket_list_rwsem);
 119
 120         return 0;
 121 }
 122 EXPORT_SYMBOL(pcmcia_socket_dev_suspend);
 123
 124 int pcmcia_socket_dev_resume(struct device *dev)
 125 {
 126         struct pcmcia_socket *socket;
 127
 128         down_read(&pcmcia_socket_list_rwsem);
 129         list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
 130                 if (socket->dev.dev != dev)
 131                         continue;
 132                 down(&socket->skt_sem);
 133                 socket_resume(socket);
 134                 up(&socket->skt_sem);
 135         }
 136         up_read(&pcmcia_socket_list_rwsem);
 137
 138         return 0;
 139 }
 140 EXPORT_SYMBOL(pcmcia_socket_dev_resume);
 141
 142
 143 struct pcmcia_socket * pcmcia_get_socket(struct pcmcia_socket *skt)
 144 {
 145         struct class_device *cl_dev = class_device_get(&skt->dev);
 146         if (!cl_dev)
 147                 return NULL;
 148         skt = class_get_devdata(cl_dev);
 149         if (!try_module_get(skt->owner)) {
 150                 class_device_put(&skt->dev);
 151                 return NULL;
 152         }
 153         return (skt);
 154 }
 155 EXPORT_SYMBOL(pcmcia_get_socket);
 156
 157
 158 void pcmcia_put_socket(struct pcmcia_socket *skt)
 159 {
 160         module_put(skt->owner);
 161         class_device_put(&skt->dev);
 162 }
 163 EXPORT_SYMBOL(pcmcia_put_socket);
 164
 165
 166 static void pcmcia_release_socket(struct class_device *class_dev)
 167 {
 168         struct pcmcia_socket *socket = class_get_devdata(class_dev);
 169
 170         complete(&socket->socket_released);
 171 }
 172
 173 static int pccardd(void *__skt);
 174
 175 /**
 176  * pcmcia_register_socket - add a new pcmcia socket device
 177  */
 178 int pcmcia_register_socket(struct pcmcia_socket *socket)
 179 {
 180         int ret;
 181
 182         if (!socket || !socket->ops || !socket->dev.dev || !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         socket->dev.class_data = socket;
 228         socket->dev.class = &pcmcia_socket_class;
 229         snprintf(socket->dev.class_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         init_waitqueue_head(&socket->thread_wait);
 240         init_MUTEX(&socket->skt_sem);
 241         spin_lock_init(&socket->thread_lock);
 242
 243         ret = kernel_thread(pccardd, socket, CLONE_KERNEL);
 244         if (ret < 0)
 245                 goto err;
 246
 247         wait_for_completion(&socket->thread_done);
 248         if(!socket->thread) {
 249                 printk(KERN_WARNING "PCMCIA: warning: socket thread for socket %p did not start\n", socket);
 250                 return -EIO;
 251         }
 252         pcmcia_parse_events(socket, SS_DETECT);
 253
 254         return 0;
 255
 256  err:
 257         down_write(&pcmcia_socket_list_rwsem);
 258         list_del(&socket->socket_list);
 259         up_write(&pcmcia_socket_list_rwsem);
 260         return ret;
 261 } /* pcmcia_register_socket */
 262 EXPORT_SYMBOL(pcmcia_register_socket);
 263
 264
 265 /**
 266  * pcmcia_unregister_socket - remove a pcmcia socket device
 267  */
 268 void pcmcia_unregister_socket(struct pcmcia_socket *socket)
 269 {
 270         if (!socket)
 271                 return;
 272
 273         cs_dbg(socket, 0, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
 274
 275         if (socket->thread) {
 276                 init_completion(&socket->thread_done);
 277                 socket->thread = NULL;
 278                 wake_up(&socket->thread_wait);
 279                 wait_for_completion(&socket->thread_done);
 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 /**
 314  * socket_setup() and shutdown_socket() are called by the main event
 315  * handler when card insertion and removal events are received.
 316  * socket_setup() turns on socket power and resets the socket, in two stages.
 317  * shutdown_socket() unconfigures a socket and turns off socket power.
 318  */
 319 static void shutdown_socket(struct pcmcia_socket *s)
 320 {
 321         cs_dbg(s, 1, "shutdown_socket\n");
 322
 323         /* Blank out the socket state */
 324         s->socket = dead_socket;
 325         s->ops->init(s);
 326         s->ops->set_socket(s, &s->socket);
 327         s->irq.AssignedIRQ = s->irq.Config = 0;
 328         s->lock_count = 0;
 329         destroy_cis_cache(s);
 330 #ifdef CONFIG_CARDBUS
 331         cb_free(s);
 332 #endif
 333         s->functions = 0;
 334         if (s->config) {
 335                 kfree(s->config);
 336                 s->config = NULL;
 337         }
 338
 339         {
 340                 int status;
 341                 s->ops->get_status(s, &status);
 342                 if (status & SS_POWERON) {
 343                         printk(KERN_ERR "PCMCIA: socket %p: *** DANGER *** unable to remove socket power\n", s);
 344                 }
 345         }
 346 } /* shutdown_socket */
 347
 348
 349 /**
 350  * The central event handler.  Send_event() sends an event to the
 351  * 16-bit subsystem, which then calls the relevant device drivers.
 352  * Parse_events() interprets the event bits from
 353  * a card status change report.  Do_shutdown() handles the high
 354  * priority stuff associated with a card removal.
 355  */
 356
 357 /* NOTE: send_event needs to be called with skt->sem held. */
 358
 359 static int send_event(struct pcmcia_socket *s, event_t event, int priority)
 360 {
 361         int ret;
 362
 363         if (s->state & SOCKET_CARDBUS)
 364                 return 0;
 365
 366         cs_dbg(s, 1, "send_event(event %d, pri %d, callback 0x%p)\n",
 367            event, priority, s->callback);
 368
 369         if (!s->callback)
 370                 return 0;
 371         if (!try_module_get(s->callback->owner))
 372                 return 0;
 373
 374         ret = s->callback->event(s, event, priority);
 375
 376         module_put(s->callback->owner);
 377
 378         return ret;
 379 }
 380
 381 static void socket_remove_drivers(struct pcmcia_socket *skt)
 382 {
 383         cs_dbg(skt, 4, "remove_drivers\n");
 384
 385         send_event(skt, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
 386 }
 387
 388 static void socket_shutdown(struct pcmcia_socket *skt)
 389 {
 390         cs_dbg(skt, 4, "shutdown\n");
 391
 392         socket_remove_drivers(skt);
 393         skt->state &= SOCKET_INUSE|SOCKET_PRESENT;
 394         msleep(shutdown_delay * 10);
 395         skt->state &= SOCKET_INUSE;
 396         shutdown_socket(skt);
 397 }
 398
 399 static int socket_reset(struct pcmcia_socket *skt)
 400 {
 401         int status, i;
 402
 403         cs_dbg(skt, 4, "reset\n");
 404
 405         skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
 406         skt->ops->set_socket(skt, &skt->socket);
 407         udelay((long)reset_time);
 408
 409         skt->socket.flags &= ~SS_RESET;
 410         skt->ops->set_socket(skt, &skt->socket);
 411
 412         msleep(unreset_delay * 10);
 413         for (i = 0; i < unreset_limit; i++) {
 414                 skt->ops->get_status(skt, &status);
 415
 416                 if (!(status & SS_DETECT))
 417                         return CS_NO_CARD;
 418
 419                 if (status & SS_READY)
 420                         return CS_SUCCESS;
 421
 422                 msleep(unreset_check * 10);
 423         }
 424
 425         cs_err(skt, "time out after reset.\n");
 426         return CS_GENERAL_FAILURE;
 427 }
 428
 429 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
 430 {
 431         int status, i;
 432
 433         cs_dbg(skt, 4, "setup\n");
 434
 435         skt->ops->get_status(skt, &status);
 436         if (!(status & SS_DETECT))
 437                 return CS_NO_CARD;
 438
 439         msleep(initial_delay * 10);
 440
 441         for (i = 0; i < 100; i++) {
 442                 skt->ops->get_status(skt, &status);
 443                 if (!(status & SS_DETECT))
 444                         return CS_NO_CARD;
 445
 446                 if (!(status & SS_PENDING))
 447                         break;
 448
 449                 msleep(100);
 450         }
 451
 452         if (status & SS_PENDING) {
 453                 cs_err(skt, "voltage interrogation timed out.\n");
 454                 return CS_GENERAL_FAILURE;
 455         }
 456
 457         if (status & SS_CARDBUS) {
 458                 if (!(skt->features & SS_CAP_CARDBUS)) {
 459                         cs_err(skt, "cardbus cards are not supported.\n");
 460                         return CS_BAD_TYPE;
 461                 }
 462                 skt->state |= SOCKET_CARDBUS;
 463         }
 464
 465         /*
 466          * Decode the card voltage requirements, and apply power to the card.
 467          */
 468         if (status & SS_3VCARD)
 469                 skt->socket.Vcc = skt->socket.Vpp = 33;
 470         else if (!(status & SS_XVCARD))
 471                 skt->socket.Vcc = skt->socket.Vpp = 50;
 472         else {
 473                 cs_err(skt, "unsupported voltage key.\n");
 474                 return CS_BAD_TYPE;
 475         }
 476
 477         if (skt->power_hook)
 478                 skt->power_hook(skt, HOOK_POWER_PRE);
 479
 480         skt->socket.flags = 0;
 481         skt->ops->set_socket(skt, &skt->socket);
 482
 483         /*
 484          * Wait "vcc_settle" for the supply to stabilise.
 485          */
 486         msleep(vcc_settle * 10);
 487
 488         skt->ops->get_status(skt, &status);
 489         if (!(status & SS_POWERON)) {
 490                 cs_err(skt, "unable to apply power.\n");
 491                 return CS_BAD_TYPE;
 492         }
 493
 494         status = socket_reset(skt);
 495
 496         if (skt->power_hook)
 497                 skt->power_hook(skt, HOOK_POWER_POST);
 498
 499         return status;
 500 }
 501
 502 /*
 503  * Handle card insertion.  Setup the socket, reset the card,
 504  * and then tell the rest of PCMCIA that a card is present.
 505  */
 506 static int socket_insert(struct pcmcia_socket *skt)
 507 {
 508         int ret;
 509
 510         cs_dbg(skt, 4, "insert\n");
 511
 512         if (!cs_socket_get(skt))
 513                 return CS_NO_CARD;
 514
 515         ret = socket_setup(skt, setup_delay);
 516         if (ret == CS_SUCCESS) {
 517                 skt->state |= SOCKET_PRESENT;
 518 #ifdef CONFIG_CARDBUS
 519                 if (skt->state & SOCKET_CARDBUS) {
 520                         cb_alloc(skt);
 521                         skt->state |= SOCKET_CARDBUS_CONFIG;
 522                 }
 523 #endif
 524                 cs_dbg(skt, 4, "insert done\n");
 525
 526                 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 527         } else {
 528                 socket_shutdown(skt);
 529                 cs_socket_put(skt);
 530         }
 531
 532         return ret;
 533 }
 534
 535 static int socket_suspend(struct pcmcia_socket *skt)
 536 {
 537         if (skt->state & SOCKET_SUSPEND)
 538                 return CS_IN_USE;
 539
 540         send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
 541         skt->socket = dead_socket;
 542         skt->ops->set_socket(skt, &skt->socket);
 543         if (skt->ops->suspend)
 544                 skt->ops->suspend(skt);
 545         skt->state |= SOCKET_SUSPEND;
 546
 547         return CS_SUCCESS;
 548 }
 549
 550 /*
 551  * Resume a socket.  If a card is present, verify its CIS against
 552  * our cached copy.  If they are different, the card has been
 553  * replaced, and we need to tell the drivers.
 554  */
 555 static int socket_resume(struct pcmcia_socket *skt)
 556 {
 557         int ret;
 558
 559         if (!(skt->state & SOCKET_SUSPEND))
 560                 return CS_IN_USE;
 561
 562         skt->socket = dead_socket;
 563         skt->ops->init(skt);
 564         skt->ops->set_socket(skt, &skt->socket);
 565
 566         if (!(skt->state & SOCKET_PRESENT)) {
 567                 skt->state &= ~SOCKET_SUSPEND;
 568                 return socket_insert(skt);
 569         }
 570
 571         ret = socket_setup(skt, resume_delay);
 572         if (ret == CS_SUCCESS) {
 573                 /*
 574                  * FIXME: need a better check here for cardbus cards.
 575                  */
 576                 if (verify_cis_cache(skt) != 0) {
 577                         cs_dbg(skt, 4, "cis mismatch - different card\n");
 578                         socket_remove_drivers(skt);
 579                         destroy_cis_cache(skt);
 580                         /*
 581                          * Workaround: give DS time to schedule removal.
 582                          * Remove me once the 100ms delay is eliminated
 583                          * in ds.c
 584                          */
 585                         msleep(200);
 586                         send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 587                 } else {
 588                         cs_dbg(skt, 4, "cis matches cache\n");
 589                         send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
 590                 }
 591         } else {
 592                 socket_shutdown(skt);
 593                 cs_socket_put(skt);
 594         }
 595
 596         skt->state &= ~SOCKET_SUSPEND;
 597
 598         return CS_SUCCESS;
 599 }
 600
 601 static void socket_remove(struct pcmcia_socket *skt)
 602 {
 603         socket_shutdown(skt);
 604         cs_socket_put(skt);
 605 }
 606
 607 /*
 608  * Process a socket card detect status change.
 609  *
 610  * If we don't have a card already present, delay the detect event for
 611  * about 20ms (to be on the safe side) before reading the socket status.
 612  *
 613  * Some i82365-based systems send multiple SS_DETECT events during card
 614  * insertion, and the "card present" status bit seems to bounce.  This
 615  * will probably be true with GPIO-based card detection systems after
 616  * the product has aged.
 617  */
 618 static void socket_detect_change(struct pcmcia_socket *skt)
 619 {
 620         if (!(skt->state & SOCKET_SUSPEND)) {
 621                 int status;
 622
 623                 if (!(skt->state & SOCKET_PRESENT))
 624                         msleep(20);
 625
 626                 skt->ops->get_status(skt, &status);
 627                 if ((skt->state & SOCKET_PRESENT) &&
 628                      !(status & SS_DETECT))
 629                         socket_remove(skt);
 630                 if (!(skt->state & SOCKET_PRESENT) &&
 631                     (status & SS_DETECT))
 632                         socket_insert(skt);
 633         }
 634 }
 635
 636 static int pccardd(void *__skt)
 637 {
 638         struct pcmcia_socket *skt = __skt;
 639         DECLARE_WAITQUEUE(wait, current);
 640         int ret;
 641
 642         daemonize("pccardd");
 643
 644         skt->thread = current;
 645         skt->socket = dead_socket;
 646         skt->ops->init(skt);
 647         skt->ops->set_socket(skt, &skt->socket);
 648
 649         /* register with the device core */
 650         ret = class_device_register(&skt->dev);
 651         if (ret) {
 652                 printk(KERN_WARNING "PCMCIA: unable to register socket 0x%p\n",
 653                         skt);
 654                 skt->thread = NULL;
 655                 complete_and_exit(&skt->thread_done, 0);
 656         }
 657         complete(&skt->thread_done);
 658
 659         add_wait_queue(&skt->thread_wait, &wait);
 660         for (;;) {
 661                 unsigned long flags;
 662                 unsigned int events;
 663
 664                 set_current_state(TASK_INTERRUPTIBLE);
 665
 666                 spin_lock_irqsave(&skt->thread_lock, flags);
 667                 events = skt->thread_events;
 668                 skt->thread_events = 0;
 669                 spin_unlock_irqrestore(&skt->thread_lock, flags);
 670
 671                 if (events) {
 672                         down(&skt->skt_sem);
 673                         if (events & SS_DETECT)
 674                                 socket_detect_change(skt);
 675                         if (events & SS_BATDEAD)
 676                                 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
 677                         if (events & SS_BATWARN)
 678                                 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
 679                         if (events & SS_READY)
 680                                 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
 681                         up(&skt->skt_sem);
 682                         continue;
 683                 }
 684
 685                 schedule();
 686                 try_to_freeze();
 687
 688                 if (!skt->thread)
 689                         break;
 690         }
 691         remove_wait_queue(&skt->thread_wait, &wait);
 692
 693         /* remove from the device core */
 694         class_device_unregister(&skt->dev);
 695
 696         complete_and_exit(&skt->thread_done, 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         cs_dbg(s, 4, "parse_events: events %08x\n", events);
 706         if (s->thread) {
 707                 spin_lock(&s->thread_lock);
 708                 s->thread_events |= events;
 709                 spin_unlock(&s->thread_lock);
 710
 711                 wake_up(&s->thread_wait);
 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_sem also protects s->callback */
 723         down(&s->skt_sem);
 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         up(&s->skt_sem);
 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         down(&skt->skt_sem);
 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 (socket_reset(skt) == CS_SUCCESS)
 776                                 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
 777                 }
 778
 779                 ret = CS_SUCCESS;
 780         } while (0);
 781         up(&skt->skt_sem);
 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         down(&skt->skt_sem);
 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                 ret = socket_suspend(skt);
 808         } while (0);
 809         up(&skt->skt_sem);
 810
 811         return ret;
 812 } /* suspend_card */
 813 EXPORT_SYMBOL(pcmcia_suspend_card);
 814
 815
 816 int pcmcia_resume_card(struct pcmcia_socket *skt)
 817 {
 818         int ret;
 819
 820         cs_dbg(skt, 1, "waking up socket\n");
 821
 822         down(&skt->skt_sem);
 823         do {
 824                 if (!(skt->state & SOCKET_PRESENT)) {
 825                         ret = CS_NO_CARD;
 826                         break;
 827                 }
 828                 if (skt->state & SOCKET_CARDBUS) {
 829                         ret = CS_UNSUPPORTED_FUNCTION;
 830                         break;
 831                 }
 832                 ret = socket_resume(skt);
 833         } while (0);
 834         up(&skt->skt_sem);
 835
 836         return ret;
 837 } /* resume_card */
 838 EXPORT_SYMBOL(pcmcia_resume_card);
 839
 840
 841 /* These handle user requests to eject or insert a card. */
 842 int pcmcia_eject_card(struct pcmcia_socket *skt)
 843 {
 844         int ret;
 845
 846         cs_dbg(skt, 1, "user eject request\n");
 847
 848         down(&skt->skt_sem);
 849         do {
 850                 if (!(skt->state & SOCKET_PRESENT)) {
 851                         ret = -ENODEV;
 852                         break;
 853                 }
 854
 855                 ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW);
 856                 if (ret != 0) {
 857                         ret = -EINVAL;
 858                         break;
 859                 }
 860
 861                 socket_remove(skt);
 862                 ret = 0;
 863         } while (0);
 864         up(&skt->skt_sem);
 865
 866         return ret;
 867 } /* eject_card */
 868 EXPORT_SYMBOL(pcmcia_eject_card);
 869
 870
 871 int pcmcia_insert_card(struct pcmcia_socket *skt)
 872 {
 873         int ret;
 874
 875         cs_dbg(skt, 1, "user insert request\n");
 876
 877         down(&skt->skt_sem);
 878         do {
 879                 if (skt->state & SOCKET_PRESENT) {
 880                         ret = -EBUSY;
 881                         break;
 882                 }
 883                 if (socket_insert(skt) == CS_NO_CARD) {
 884                         ret = -ENODEV;
 885                         break;
 886                 }
 887                 ret = 0;
 888         } while (0);
 889         up(&skt->skt_sem);
 890
 891         return ret;
 892 } /* insert_card */
 893 EXPORT_SYMBOL(pcmcia_insert_card);
 894
 895
 896 static int pcmcia_socket_hotplug(struct class_device *dev, char **envp,
 897                                 int num_envp, char *buffer, int buffer_size)
 898 {
 899         struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 900         int i = 0, length = 0;
 901
 902         if (add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size,
 903                                 &length, "SOCKET_NO=%u", s->sock))
 904                 return -ENOMEM;
 905
 906         envp[i] = NULL;
 907
 908         return 0;
 909 }
 910
 911
 912 static struct completion pcmcia_unload;
 913
 914 static void pcmcia_release_socket_class(struct class *data)
 915 {
 916         complete(&pcmcia_unload);
 917 }
 918
 919
 920 struct class pcmcia_socket_class = {
 921         .name = "pcmcia_socket",
 922         .hotplug = pcmcia_socket_hotplug,
 923         .release = pcmcia_release_socket,
 924         .class_release = pcmcia_release_socket_class,
 925 };
 926 EXPORT_SYMBOL(pcmcia_socket_class);
 927
 928
 929 static int __init init_pcmcia_cs(void)
 930 {
 931         int ret;
 932
 933         init_completion(&pcmcia_unload);
 934         ret = class_register(&pcmcia_socket_class);
 935         if (ret)
 936                 return (ret);
 937         return class_interface_register(&pccard_sysfs_interface);
 938 }
 939
 940 static void __exit exit_pcmcia_cs(void)
 941 {
 942         class_interface_unregister(&pccard_sysfs_interface);
 943         class_unregister(&pcmcia_socket_class);
 944
 945         wait_for_completion(&pcmcia_unload);
 946 }
 947
 948 subsys_initcall(init_pcmcia_cs);
 949 module_exit(exit_pcmcia_cs);
 950