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         kfree(s->config);
 335         s->config = NULL;
 336
 337         {
 338                 int status;
 339                 s->ops->get_status(s, &status);
 340                 if (status & SS_POWERON) {
 341                         printk(KERN_ERR "PCMCIA: socket %p: *** DANGER *** unable to remove socket power\n", s);
 342                 }
 343         }
 344 } /* shutdown_socket */
 345
 346
 347 /**
 348  * The central event handler.  Send_event() sends an event to the
 349  * 16-bit subsystem, which then calls the relevant device drivers.
 350  * Parse_events() interprets the event bits from
 351  * a card status change report.  Do_shutdown() handles the high
 352  * priority stuff associated with a card removal.
 353  */
 354
 355 /* NOTE: send_event needs to be called with skt->sem held. */
 356
 357 static int send_event(struct pcmcia_socket *s, event_t event, int priority)
 358 {
 359         int ret;
 360
 361         if (s->state & SOCKET_CARDBUS)
 362                 return 0;
 363
 364         cs_dbg(s, 1, "send_event(event %d, pri %d, callback 0x%p)\n",
 365            event, priority, s->callback);
 366
 367         if (!s->callback)
 368                 return 0;
 369         if (!try_module_get(s->callback->owner))
 370                 return 0;
 371
 372         ret = s->callback->event(s, event, priority);
 373
 374         module_put(s->callback->owner);
 375
 376         return ret;
 377 }
 378
 379 static void socket_remove_drivers(struct pcmcia_socket *skt)
 380 {
 381         cs_dbg(skt, 4, "remove_drivers\n");
 382
 383         send_event(skt, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
 384 }
 385
 386 static void socket_shutdown(struct pcmcia_socket *skt)
 387 {
 388         cs_dbg(skt, 4, "shutdown\n");
 389
 390         socket_remove_drivers(skt);
 391         skt->state &= SOCKET_INUSE|SOCKET_PRESENT;
 392         msleep(shutdown_delay * 10);
 393         skt->state &= SOCKET_INUSE;
 394         shutdown_socket(skt);
 395 }
 396
 397 static int socket_reset(struct pcmcia_socket *skt)
 398 {
 399         int status, i;
 400
 401         cs_dbg(skt, 4, "reset\n");
 402
 403         skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
 404         skt->ops->set_socket(skt, &skt->socket);
 405         udelay((long)reset_time);
 406
 407         skt->socket.flags &= ~SS_RESET;
 408         skt->ops->set_socket(skt, &skt->socket);
 409
 410         msleep(unreset_delay * 10);
 411         for (i = 0; i < unreset_limit; i++) {
 412                 skt->ops->get_status(skt, &status);
 413
 414                 if (!(status & SS_DETECT))
 415                         return CS_NO_CARD;
 416
 417                 if (status & SS_READY)
 418                         return CS_SUCCESS;
 419
 420                 msleep(unreset_check * 10);
 421         }
 422
 423         cs_err(skt, "time out after reset.\n");
 424         return CS_GENERAL_FAILURE;
 425 }
 426
 427 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
 428 {
 429         int status, i;
 430
 431         cs_dbg(skt, 4, "setup\n");
 432
 433         skt->ops->get_status(skt, &status);
 434         if (!(status & SS_DETECT))
 435                 return CS_NO_CARD;
 436
 437         msleep(initial_delay * 10);
 438
 439         for (i = 0; i < 100; i++) {
 440                 skt->ops->get_status(skt, &status);
 441                 if (!(status & SS_DETECT))
 442                         return CS_NO_CARD;
 443
 444                 if (!(status & SS_PENDING))
 445                         break;
 446
 447                 msleep(100);
 448         }
 449
 450         if (status & SS_PENDING) {
 451                 cs_err(skt, "voltage interrogation timed out.\n");
 452                 return CS_GENERAL_FAILURE;
 453         }
 454
 455         if (status & SS_CARDBUS) {
 456                 if (!(skt->features & SS_CAP_CARDBUS)) {
 457                         cs_err(skt, "cardbus cards are not supported.\n");
 458                         return CS_BAD_TYPE;
 459                 }
 460                 skt->state |= SOCKET_CARDBUS;
 461         }
 462
 463         /*
 464          * Decode the card voltage requirements, and apply power to the card.
 465          */
 466         if (status & SS_3VCARD)
 467                 skt->socket.Vcc = skt->socket.Vpp = 33;
 468         else if (!(status & SS_XVCARD))
 469                 skt->socket.Vcc = skt->socket.Vpp = 50;
 470         else {
 471                 cs_err(skt, "unsupported voltage key.\n");
 472                 return CS_BAD_TYPE;
 473         }
 474
 475         if (skt->power_hook)
 476                 skt->power_hook(skt, HOOK_POWER_PRE);
 477
 478         skt->socket.flags = 0;
 479         skt->ops->set_socket(skt, &skt->socket);
 480
 481         /*
 482          * Wait "vcc_settle" for the supply to stabilise.
 483          */
 484         msleep(vcc_settle * 10);
 485
 486         skt->ops->get_status(skt, &status);
 487         if (!(status & SS_POWERON)) {
 488                 cs_err(skt, "unable to apply power.\n");
 489                 return CS_BAD_TYPE;
 490         }
 491
 492         status = socket_reset(skt);
 493
 494         if (skt->power_hook)
 495                 skt->power_hook(skt, HOOK_POWER_POST);
 496
 497         return status;
 498 }
 499
 500 /*
 501  * Handle card insertion.  Setup the socket, reset the card,
 502  * and then tell the rest of PCMCIA that a card is present.
 503  */
 504 static int socket_insert(struct pcmcia_socket *skt)
 505 {
 506         int ret;
 507
 508         cs_dbg(skt, 4, "insert\n");
 509
 510         if (!cs_socket_get(skt))
 511                 return CS_NO_CARD;
 512
 513         ret = socket_setup(skt, setup_delay);
 514         if (ret == CS_SUCCESS) {
 515                 skt->state |= SOCKET_PRESENT;
 516
 517                 printk(KERN_NOTICE "pccard: %s card inserted into slot %d\n",
 518                        (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
 519                        skt->sock);
 520
 521 #ifdef CONFIG_CARDBUS
 522                 if (skt->state & SOCKET_CARDBUS) {
 523                         cb_alloc(skt);
 524                         skt->state |= SOCKET_CARDBUS_CONFIG;
 525                 }
 526 #endif
 527                 cs_dbg(skt, 4, "insert done\n");
 528
 529                 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 530         } else {
 531                 socket_shutdown(skt);
 532                 cs_socket_put(skt);
 533         }
 534
 535         return ret;
 536 }
 537
 538 static int socket_suspend(struct pcmcia_socket *skt)
 539 {
 540         if (skt->state & SOCKET_SUSPEND)
 541                 return CS_IN_USE;
 542
 543         send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
 544         skt->socket = dead_socket;
 545         skt->ops->set_socket(skt, &skt->socket);
 546         if (skt->ops->suspend)
 547                 skt->ops->suspend(skt);
 548         skt->state |= SOCKET_SUSPEND;
 549
 550         return CS_SUCCESS;
 551 }
 552
 553 /*
 554  * Resume a socket.  If a card is present, verify its CIS against
 555  * our cached copy.  If they are different, the card has been
 556  * replaced, and we need to tell the drivers.
 557  */
 558 static int socket_resume(struct pcmcia_socket *skt)
 559 {
 560         int ret;
 561
 562         if (!(skt->state & SOCKET_SUSPEND))
 563                 return CS_IN_USE;
 564
 565         skt->socket = dead_socket;
 566         skt->ops->init(skt);
 567         skt->ops->set_socket(skt, &skt->socket);
 568
 569         if (!(skt->state & SOCKET_PRESENT)) {
 570                 skt->state &= ~SOCKET_SUSPEND;
 571                 return socket_insert(skt);
 572         }
 573
 574         ret = socket_setup(skt, resume_delay);
 575         if (ret == CS_SUCCESS) {
 576                 /*
 577                  * FIXME: need a better check here for cardbus cards.
 578                  */
 579                 if (verify_cis_cache(skt) != 0) {
 580                         cs_dbg(skt, 4, "cis mismatch - different card\n");
 581                         socket_remove_drivers(skt);
 582                         destroy_cis_cache(skt);
 583                         /*
 584                          * Workaround: give DS time to schedule removal.
 585                          * Remove me once the 100ms delay is eliminated
 586                          * in ds.c
 587                          */
 588                         msleep(200);
 589                         send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 590                 } else {
 591                         cs_dbg(skt, 4, "cis matches cache\n");
 592                         send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
 593                 }
 594         } else {
 595                 socket_shutdown(skt);
 596                 cs_socket_put(skt);
 597         }
 598
 599         skt->state &= ~SOCKET_SUSPEND;
 600
 601         return CS_SUCCESS;
 602 }
 603
 604 static void socket_remove(struct pcmcia_socket *skt)
 605 {
 606         printk(KERN_NOTICE "pccard: card ejected from slot %d\n", skt->sock);
 607         socket_shutdown(skt);
 608         cs_socket_put(skt);
 609 }
 610
 611 /*
 612  * Process a socket card detect status change.
 613  *
 614  * If we don't have a card already present, delay the detect event for
 615  * about 20ms (to be on the safe side) before reading the socket status.
 616  *
 617  * Some i82365-based systems send multiple SS_DETECT events during card
 618  * insertion, and the "card present" status bit seems to bounce.  This
 619  * will probably be true with GPIO-based card detection systems after
 620  * the product has aged.
 621  */
 622 static void socket_detect_change(struct pcmcia_socket *skt)
 623 {
 624         if (!(skt->state & SOCKET_SUSPEND)) {
 625                 int status;
 626
 627                 if (!(skt->state & SOCKET_PRESENT))
 628                         msleep(20);
 629
 630                 skt->ops->get_status(skt, &status);
 631                 if ((skt->state & SOCKET_PRESENT) &&
 632                      !(status & SS_DETECT))
 633                         socket_remove(skt);
 634                 if (!(skt->state & SOCKET_PRESENT) &&
 635                     (status & SS_DETECT))
 636                         socket_insert(skt);
 637         }
 638 }
 639
 640 static int pccardd(void *__skt)
 641 {
 642         struct pcmcia_socket *skt = __skt;
 643         DECLARE_WAITQUEUE(wait, current);
 644         int ret;
 645
 646         daemonize("pccardd");
 647
 648         skt->thread = current;
 649         skt->socket = dead_socket;
 650         skt->ops->init(skt);
 651         skt->ops->set_socket(skt, &skt->socket);
 652
 653         /* register with the device core */
 654         ret = class_device_register(&skt->dev);
 655         if (ret) {
 656                 printk(KERN_WARNING "PCMCIA: unable to register socket 0x%p\n",
 657                         skt);
 658                 skt->thread = NULL;
 659                 complete_and_exit(&skt->thread_done, 0);
 660         }
 661
 662         add_wait_queue(&skt->thread_wait, &wait);
 663         complete(&skt->thread_done);
 664
 665         for (;;) {
 666                 unsigned long flags;
 667                 unsigned int events;
 668
 669                 set_current_state(TASK_INTERRUPTIBLE);
 670
 671                 spin_lock_irqsave(&skt->thread_lock, flags);
 672                 events = skt->thread_events;
 673                 skt->thread_events = 0;
 674                 spin_unlock_irqrestore(&skt->thread_lock, flags);
 675
 676                 if (events) {
 677                         down(&skt->skt_sem);
 678                         if (events & SS_DETECT)
 679                                 socket_detect_change(skt);
 680                         if (events & SS_BATDEAD)
 681                                 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
 682                         if (events & SS_BATWARN)
 683                                 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
 684                         if (events & SS_READY)
 685                                 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
 686                         up(&skt->skt_sem);
 687                         continue;
 688                 }
 689
 690                 if (!skt->thread)
 691                         break;
 692
 693                 schedule();
 694                 try_to_freeze();
 695         }
 696         /* make sure we are running before we exit */
 697         set_current_state(TASK_RUNNING);
 698
 699         remove_wait_queue(&skt->thread_wait, &wait);
 700
 701         /* remove from the device core */
 702         class_device_unregister(&skt->dev);
 703
 704         complete_and_exit(&skt->thread_done, 0);
 705 }
 706
 707 /*
 708  * Yenta (at least) probes interrupts before registering the socket and
 709  * starting the handler thread.
 710  */
 711 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
 712 {
 713         cs_dbg(s, 4, "parse_events: events %08x\n", events);
 714         if (s->thread) {
 715                 spin_lock(&s->thread_lock);
 716                 s->thread_events |= events;
 717                 spin_unlock(&s->thread_lock);
 718
 719                 wake_up(&s->thread_wait);
 720         }
 721 } /* pcmcia_parse_events */
 722 EXPORT_SYMBOL(pcmcia_parse_events);
 723
 724
 725 /* register pcmcia_callback */
 726 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
 727 {
 728         int ret = 0;
 729
 730         /* s->skt_sem also protects s->callback */
 731         down(&s->skt_sem);
 732
 733         if (c) {
 734                 /* registration */
 735                 if (s->callback) {
 736                         ret = -EBUSY;
 737                         goto err;
 738                 }
 739
 740                 s->callback = c;
 741
 742                 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
 743                         send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 744         } else
 745                 s->callback = NULL;
 746  err:
 747         up(&s->skt_sem);
 748
 749         return ret;
 750 }
 751 EXPORT_SYMBOL(pccard_register_pcmcia);
 752
 753
 754 /* I'm not sure which "reset" function this is supposed to use,
 755  * but for now, it uses the low-level interface's reset, not the
 756  * CIS register.
 757  */
 758
 759 int pccard_reset_card(struct pcmcia_socket *skt)
 760 {
 761         int ret;
 762
 763         cs_dbg(skt, 1, "resetting socket\n");
 764
 765         down(&skt->skt_sem);
 766         do {
 767                 if (!(skt->state & SOCKET_PRESENT)) {
 768                         ret = CS_NO_CARD;
 769                         break;
 770                 }
 771                 if (skt->state & SOCKET_SUSPEND) {
 772                         ret = CS_IN_USE;
 773                         break;
 774                 }
 775                 if (skt->state & SOCKET_CARDBUS) {
 776                         ret = CS_UNSUPPORTED_FUNCTION;
 777                         break;
 778                 }
 779
 780                 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW);
 781                 if (ret == 0) {
 782                         send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
 783                         if (socket_reset(skt) == CS_SUCCESS)
 784                                 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
 785                 }
 786
 787                 ret = CS_SUCCESS;
 788         } while (0);
 789         up(&skt->skt_sem);
 790
 791         return ret;
 792 } /* reset_card */
 793 EXPORT_SYMBOL(pccard_reset_card);
 794
 795
 796 /* These shut down or wake up a socket.  They are sort of user
 797  * initiated versions of the APM suspend and resume actions.
 798  */
 799 int pcmcia_suspend_card(struct pcmcia_socket *skt)
 800 {
 801         int ret;
 802
 803         cs_dbg(skt, 1, "suspending socket\n");
 804
 805         down(&skt->skt_sem);
 806         do {
 807                 if (!(skt->state & SOCKET_PRESENT)) {
 808                         ret = CS_NO_CARD;
 809                         break;
 810                 }
 811                 if (skt->state & SOCKET_CARDBUS) {
 812                         ret = CS_UNSUPPORTED_FUNCTION;
 813                         break;
 814                 }
 815                 ret = socket_suspend(skt);
 816         } while (0);
 817         up(&skt->skt_sem);
 818
 819         return ret;
 820 } /* suspend_card */
 821 EXPORT_SYMBOL(pcmcia_suspend_card);
 822
 823
 824 int pcmcia_resume_card(struct pcmcia_socket *skt)
 825 {
 826         int ret;
 827
 828         cs_dbg(skt, 1, "waking up socket\n");
 829
 830         down(&skt->skt_sem);
 831         do {
 832                 if (!(skt->state & SOCKET_PRESENT)) {
 833                         ret = CS_NO_CARD;
 834                         break;
 835                 }
 836                 if (skt->state & SOCKET_CARDBUS) {
 837                         ret = CS_UNSUPPORTED_FUNCTION;
 838                         break;
 839                 }
 840                 ret = socket_resume(skt);
 841         } while (0);
 842         up(&skt->skt_sem);
 843
 844         return ret;
 845 } /* resume_card */
 846 EXPORT_SYMBOL(pcmcia_resume_card);
 847
 848
 849 /* These handle user requests to eject or insert a card. */
 850 int pcmcia_eject_card(struct pcmcia_socket *skt)
 851 {
 852         int ret;
 853
 854         cs_dbg(skt, 1, "user eject request\n");
 855
 856         down(&skt->skt_sem);
 857         do {
 858                 if (!(skt->state & SOCKET_PRESENT)) {
 859                         ret = -ENODEV;
 860                         break;
 861                 }
 862
 863                 ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW);
 864                 if (ret != 0) {
 865                         ret = -EINVAL;
 866                         break;
 867                 }
 868
 869                 socket_remove(skt);
 870                 ret = 0;
 871         } while (0);
 872         up(&skt->skt_sem);
 873
 874         return ret;
 875 } /* eject_card */
 876 EXPORT_SYMBOL(pcmcia_eject_card);
 877
 878
 879 int pcmcia_insert_card(struct pcmcia_socket *skt)
 880 {
 881         int ret;
 882
 883         cs_dbg(skt, 1, "user insert request\n");
 884
 885         down(&skt->skt_sem);
 886         do {
 887                 if (skt->state & SOCKET_PRESENT) {
 888                         ret = -EBUSY;
 889                         break;
 890                 }
 891                 if (socket_insert(skt) == CS_NO_CARD) {
 892                         ret = -ENODEV;
 893                         break;
 894                 }
 895                 ret = 0;
 896         } while (0);
 897         up(&skt->skt_sem);
 898
 899         return ret;
 900 } /* insert_card */
 901 EXPORT_SYMBOL(pcmcia_insert_card);
 902
 903
 904 static int pcmcia_socket_hotplug(struct class_device *dev, char **envp,
 905                                 int num_envp, char *buffer, int buffer_size)
 906 {
 907         struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 908         int i = 0, length = 0;
 909
 910         if (add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size,
 911                                 &length, "SOCKET_NO=%u", s->sock))
 912                 return -ENOMEM;
 913
 914         envp[i] = NULL;
 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         .hotplug = pcmcia_socket_hotplug,
 931         .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         int ret;
 940
 941         init_completion(&pcmcia_unload);
 942         ret = class_register(&pcmcia_socket_class);
 943         if (ret)
 944                 return (ret);
 945         return class_interface_register(&pccard_sysfs_interface);
 946 }
 947
 948 static void __exit exit_pcmcia_cs(void)
 949 {
 950         class_interface_unregister(&pccard_sysfs_interface);
 951         class_unregister(&pcmcia_socket_class);
 952
 953         wait_for_completion(&pcmcia_unload);
 954 }
 955
 956 subsys_initcall(init_pcmcia_cs);
 957 module_exit(exit_pcmcia_cs);
 958