drivers/pcmcia/cs.c

   1 /*
   2  * cs.c -- Kernel Card Services - core services
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * The initial developer of the original code is David A. Hinds
   9  * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
  10  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
  11  *
  12  * (C) 1999             David A. Hinds
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/moduleparam.h>
  17 #include <linux/init.h>
  18 #include <linux/kernel.h>
  19 #include <linux/string.h>
  20 #include <linux/major.h>
  21 #include <linux/errno.h>
  22 #include <linux/slab.h>
  23 #include <linux/mm.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/timer.h>
  26 #include <linux/ioport.h>
  27 #include <linux/delay.h>
  28 #include <linux/pm.h>
  29 #include <linux/device.h>
  30 #include <linux/kthread.h>
  31 #include <linux/freezer.h>
  32 #include <asm/system.h>
  33 #include <asm/irq.h>
  34
  35 #include <pcmcia/cs_types.h>
  36 #include <pcmcia/ss.h>
  37 #include <pcmcia/cs.h>
  38 #include <pcmcia/cistpl.h>
  39 #include <pcmcia/cisreg.h>
  40 #include <pcmcia/ds.h>
  41 #include "cs_internal.h"
  42
  43
  44 /* Module parameters */
  45
  46 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
  47 MODULE_DESCRIPTION("Linux Kernel Card Services");
  48 MODULE_LICENSE("GPL");
  49
  50 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
  51
  52 INT_MODULE_PARM(setup_delay,    10);            /* centiseconds */
  53 INT_MODULE_PARM(resume_delay,   20);            /* centiseconds */
  54 INT_MODULE_PARM(shutdown_delay, 3);             /* centiseconds */
  55 INT_MODULE_PARM(vcc_settle,     40);            /* centiseconds */
  56 INT_MODULE_PARM(reset_time,     10);            /* usecs */
  57 INT_MODULE_PARM(unreset_delay,  10);            /* centiseconds */
  58 INT_MODULE_PARM(unreset_check,  10);            /* centiseconds */
  59 INT_MODULE_PARM(unreset_limit,  30);            /* unreset_check's */
  60
  61 /* Access speed for attribute memory windows */
  62 INT_MODULE_PARM(cis_speed,      300);           /* ns */
  63
  64
  65 socket_state_t dead_socket = {
  66         .csc_mask       = SS_DETECT,
  67 };
  68 EXPORT_SYMBOL(dead_socket);
  69
  70
  71 /* List of all sockets, protected by a rwsem */
  72 LIST_HEAD(pcmcia_socket_list);
  73 EXPORT_SYMBOL(pcmcia_socket_list);
  74
  75 DECLARE_RWSEM(pcmcia_socket_list_rwsem);
  76 EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
  77
  78
  79 /*
  80  * Low-level PCMCIA socket drivers need to register with the PCCard
  81  * core using pcmcia_register_socket.
  82  *
  83  * socket drivers are expected to use the following callbacks in their
  84  * .drv struct:
  85  *  - pcmcia_socket_dev_suspend
  86  *  - pcmcia_socket_dev_resume
  87  * These functions check for the appropriate struct pcmcia_soket arrays,
  88  * and pass them to the low-level functions pcmcia_{suspend,resume}_socket
  89  */
  90 static int socket_early_resume(struct pcmcia_socket *skt);
  91 static int socket_late_resume(struct pcmcia_socket *skt);
  92 static int socket_resume(struct pcmcia_socket *skt);
  93 static int socket_suspend(struct pcmcia_socket *skt);
  94
  95 static void pcmcia_socket_dev_run(struct device *dev,
  96                                   int (*cb)(struct pcmcia_socket *))
  97 {
  98         struct pcmcia_socket *socket;
  99
 100         down_read(&pcmcia_socket_list_rwsem);
 101         list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
 102                 if (socket->dev.parent != dev)
 103                         continue;
 104                 mutex_lock(&socket->skt_mutex);
 105                 cb(socket);
 106                 mutex_unlock(&socket->skt_mutex);
 107         }
 108         up_read(&pcmcia_socket_list_rwsem);
 109 }
 110
 111 int pcmcia_socket_dev_suspend(struct device *dev)
 112 {
 113         pcmcia_socket_dev_run(dev, socket_suspend);
 114         return 0;
 115 }
 116 EXPORT_SYMBOL(pcmcia_socket_dev_suspend);
 117
 118 void pcmcia_socket_dev_early_resume(struct device *dev)
 119 {
 120         pcmcia_socket_dev_run(dev, socket_early_resume);
 121 }
 122 EXPORT_SYMBOL(pcmcia_socket_dev_early_resume);
 123
 124 void pcmcia_socket_dev_late_resume(struct device *dev)
 125 {
 126         pcmcia_socket_dev_run(dev, socket_late_resume);
 127 }
 128 EXPORT_SYMBOL(pcmcia_socket_dev_late_resume);
 129
 130 int pcmcia_socket_dev_resume(struct device *dev)
 131 {
 132         pcmcia_socket_dev_run(dev, socket_resume);
 133         return 0;
 134 }
 135 EXPORT_SYMBOL(pcmcia_socket_dev_resume);
 136
 137
 138 struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt)
 139 {
 140         struct device *dev = get_device(&skt->dev);
 141         if (!dev)
 142                 return NULL;
 143         skt = dev_get_drvdata(dev);
 144         if (!try_module_get(skt->owner)) {
 145                 put_device(&skt->dev);
 146                 return NULL;
 147         }
 148         return skt;
 149 }
 150 EXPORT_SYMBOL(pcmcia_get_socket);
 151
 152
 153 void pcmcia_put_socket(struct pcmcia_socket *skt)
 154 {
 155         module_put(skt->owner);
 156         put_device(&skt->dev);
 157 }
 158 EXPORT_SYMBOL(pcmcia_put_socket);
 159
 160
 161 static void pcmcia_release_socket(struct device *dev)
 162 {
 163         struct pcmcia_socket *socket = dev_get_drvdata(dev);
 164
 165         complete(&socket->socket_released);
 166 }
 167
 168 static int pccardd(void *__skt);
 169
 170 /**
 171  * pcmcia_register_socket - add a new pcmcia socket device
 172  * @socket: the &socket to register
 173  */
 174 int pcmcia_register_socket(struct pcmcia_socket *socket)
 175 {
 176         struct task_struct *tsk;
 177         int ret;
 178
 179         if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
 180                 return -EINVAL;
 181
 182         dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);
 183
 184         spin_lock_init(&socket->lock);
 185
 186         /* try to obtain a socket number [yes, it gets ugly if we
 187          * register more than 2^sizeof(unsigned int) pcmcia
 188          * sockets... but the socket number is deprecated
 189          * anyways, so I don't care] */
 190         down_write(&pcmcia_socket_list_rwsem);
 191         if (list_empty(&pcmcia_socket_list))
 192                 socket->sock = 0;
 193         else {
 194                 unsigned int found, i = 1;
 195                 struct pcmcia_socket *tmp;
 196                 do {
 197                         found = 1;
 198                         list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
 199                                 if (tmp->sock == i)
 200                                         found = 0;
 201                         }
 202                         i++;
 203                 } while (!found);
 204                 socket->sock = i - 1;
 205         }
 206         list_add_tail(&socket->socket_list, &pcmcia_socket_list);
 207         up_write(&pcmcia_socket_list_rwsem);
 208
 209 #ifndef CONFIG_CARDBUS
 210         /*
 211          * If we do not support Cardbus, ensure that
 212          * the Cardbus socket capability is disabled.
 213          */
 214         socket->features &= ~SS_CAP_CARDBUS;
 215 #endif
 216
 217         /* set proper values in socket->dev */
 218         dev_set_drvdata(&socket->dev, socket);
 219         socket->dev.class = &pcmcia_socket_class;
 220         dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock);
 221
 222         /* base address = 0, map = 0 */
 223         socket->cis_mem.flags = 0;
 224         socket->cis_mem.speed = cis_speed;
 225
 226         INIT_LIST_HEAD(&socket->cis_cache);
 227
 228         init_completion(&socket->socket_released);
 229         init_completion(&socket->thread_done);
 230         mutex_init(&socket->skt_mutex);
 231         spin_lock_init(&socket->thread_lock);
 232
 233         if (socket->resource_ops->init) {
 234                 ret = socket->resource_ops->init(socket);
 235                 if (ret)
 236                         goto err;
 237         }
 238
 239         tsk = kthread_run(pccardd, socket, "pccardd");
 240         if (IS_ERR(tsk)) {
 241                 ret = PTR_ERR(tsk);
 242                 goto err;
 243         }
 244
 245         wait_for_completion(&socket->thread_done);
 246         if (!socket->thread) {
 247                 dev_printk(KERN_WARNING, &socket->dev,
 248                            "PCMCIA: warning: socket thread did not start\n");
 249                 return -EIO;
 250         }
 251
 252         pcmcia_parse_events(socket, SS_DETECT);
 253
 254         /*
 255          * Let's try to get the PCMCIA module for 16-bit PCMCIA support.
 256          * If it fails, it doesn't matter -- we still have 32-bit CardBus
 257          * support to offer, so this is not a failure mode.
 258          */
 259         request_module_nowait("pcmcia");
 260
 261         return 0;
 262
 263  err:
 264         down_write(&pcmcia_socket_list_rwsem);
 265         list_del(&socket->socket_list);
 266         up_write(&pcmcia_socket_list_rwsem);
 267         return ret;
 268 } /* pcmcia_register_socket */
 269 EXPORT_SYMBOL(pcmcia_register_socket);
 270
 271
 272 /**
 273  * pcmcia_unregister_socket - remove a pcmcia socket device
 274  * @socket: the &socket to unregister
 275  */
 276 void pcmcia_unregister_socket(struct pcmcia_socket *socket)
 277 {
 278         if (!socket)
 279                 return;
 280
 281         dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
 282
 283         if (socket->thread)
 284                 kthread_stop(socket->thread);
 285
 286         release_cis_mem(socket);
 287
 288         /* remove from our own list */
 289         down_write(&pcmcia_socket_list_rwsem);
 290         list_del(&socket->socket_list);
 291         up_write(&pcmcia_socket_list_rwsem);
 292
 293         /* wait for sysfs to drop all references */
 294         release_resource_db(socket);
 295         wait_for_completion(&socket->socket_released);
 296 } /* pcmcia_unregister_socket */
 297 EXPORT_SYMBOL(pcmcia_unregister_socket);
 298
 299
 300 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr)
 301 {
 302         struct pcmcia_socket *s;
 303
 304         down_read(&pcmcia_socket_list_rwsem);
 305         list_for_each_entry(s, &pcmcia_socket_list, socket_list)
 306                 if (s->sock == nr) {
 307                         up_read(&pcmcia_socket_list_rwsem);
 308                         return s;
 309                 }
 310         up_read(&pcmcia_socket_list_rwsem);
 311
 312         return NULL;
 313
 314 }
 315 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
 316
 317 /*
 318  * The central event handler.  Send_event() sends an event to the
 319  * 16-bit subsystem, which then calls the relevant device drivers.
 320  * Parse_events() interprets the event bits from
 321  * a card status change report.  Do_shutdown() handles the high
 322  * priority stuff associated with a card removal.
 323  */
 324
 325 /* NOTE: send_event needs to be called with skt->sem held. */
 326
 327 static int send_event(struct pcmcia_socket *s, event_t event, int priority)
 328 {
 329         int ret;
 330
 331         if (s->state & SOCKET_CARDBUS)
 332                 return 0;
 333
 334         dev_dbg(&s->dev, "send_event(event %d, pri %d, callback 0x%p)\n",
 335            event, priority, s->callback);
 336
 337         if (!s->callback)
 338                 return 0;
 339         if (!try_module_get(s->callback->owner))
 340                 return 0;
 341
 342         ret = s->callback->event(s, event, priority);
 343
 344         module_put(s->callback->owner);
 345
 346         return ret;
 347 }
 348
 349 static void socket_remove_drivers(struct pcmcia_socket *skt)
 350 {
 351         dev_dbg(&skt->dev, "remove_drivers\n");
 352
 353         send_event(skt, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
 354 }
 355
 356 static int socket_reset(struct pcmcia_socket *skt)
 357 {
 358         int status, i;
 359
 360         dev_dbg(&skt->dev, "reset\n");
 361
 362         skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
 363         skt->ops->set_socket(skt, &skt->socket);
 364         udelay((long)reset_time);
 365
 366         skt->socket.flags &= ~SS_RESET;
 367         skt->ops->set_socket(skt, &skt->socket);
 368
 369         msleep(unreset_delay * 10);
 370         for (i = 0; i < unreset_limit; i++) {
 371                 skt->ops->get_status(skt, &status);
 372
 373                 if (!(status & SS_DETECT))
 374                         return -ENODEV;
 375
 376                 if (status & SS_READY)
 377                         return 0;
 378
 379                 msleep(unreset_check * 10);
 380         }
 381
 382         dev_printk(KERN_ERR, &skt->dev, "time out after reset.\n");
 383         return -ETIMEDOUT;
 384 }
 385
 386 /*
 387  * socket_setup() and socket_shutdown() are called by the main event handler
 388  * when card insertion and removal events are received.
 389  * socket_setup() turns on socket power and resets the socket, in two stages.
 390  * socket_shutdown() unconfigures a socket and turns off socket power.
 391  */
 392 static void socket_shutdown(struct pcmcia_socket *s)
 393 {
 394         int status;
 395
 396         dev_dbg(&s->dev, "shutdown\n");
 397
 398         socket_remove_drivers(s);
 399         s->state &= SOCKET_INUSE | SOCKET_PRESENT;
 400         msleep(shutdown_delay * 10);
 401         s->state &= SOCKET_INUSE;
 402
 403         /* Blank out the socket state */
 404         s->socket = dead_socket;
 405         s->ops->init(s);
 406         s->ops->set_socket(s, &s->socket);
 407         s->irq.AssignedIRQ = s->irq.Config = 0;
 408         s->lock_count = 0;
 409         destroy_cis_cache(s);
 410 #ifdef CONFIG_CARDBUS
 411         cb_free(s);
 412 #endif
 413         s->functions = 0;
 414
 415         /* give socket some time to power down */
 416         msleep(100);
 417
 418         s->ops->get_status(s, &status);
 419         if (status & SS_POWERON) {
 420                 dev_printk(KERN_ERR, &s->dev,
 421                            "*** DANGER *** unable to remove socket power\n");
 422         }
 423
 424         cs_socket_put(s);
 425 }
 426
 427 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
 428 {
 429         int status, i;
 430
 431         dev_dbg(&skt->dev, "setup\n");
 432
 433         skt->ops->get_status(skt, &status);
 434         if (!(status & SS_DETECT))
 435                 return -ENODEV;
 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 -ENODEV;
 443
 444                 if (!(status & SS_PENDING))
 445                         break;
 446
 447                 msleep(100);
 448         }
 449
 450         if (status & SS_PENDING) {
 451                 dev_printk(KERN_ERR, &skt->dev,
 452                            "voltage interrogation timed out.\n");
 453                 return -ETIMEDOUT;
 454         }
 455
 456         if (status & SS_CARDBUS) {
 457                 if (!(skt->features & SS_CAP_CARDBUS)) {
 458                         dev_printk(KERN_ERR, &skt->dev,
 459                                 "cardbus cards are not supported.\n");
 460                         return -EINVAL;
 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                 dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n");
 474                 return -EIO;
 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                 dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n");
 491                 return -EIO;
 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         dev_dbg(&skt->dev, "insert\n");
 511
 512         if (!cs_socket_get(skt))
 513                 return -ENODEV;
 514
 515         ret = socket_setup(skt, setup_delay);
 516         if (ret == 0) {
 517                 skt->state |= SOCKET_PRESENT;
 518
 519                 dev_printk(KERN_NOTICE, &skt->dev,
 520                            "pccard: %s card inserted into slot %d\n",
 521                            (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
 522                            skt->sock);
 523
 524 #ifdef CONFIG_CARDBUS
 525                 if (skt->state & SOCKET_CARDBUS) {
 526                         cb_alloc(skt);
 527                         skt->state |= SOCKET_CARDBUS_CONFIG;
 528                 }
 529 #endif
 530                 dev_dbg(&skt->dev, "insert done\n");
 531
 532                 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 533         } else {
 534                 socket_shutdown(skt);
 535         }
 536
 537         return ret;
 538 }
 539
 540 static int socket_suspend(struct pcmcia_socket *skt)
 541 {
 542         if (skt->state & SOCKET_SUSPEND)
 543                 return -EBUSY;
 544
 545         send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
 546         skt->socket = dead_socket;
 547         skt->ops->set_socket(skt, &skt->socket);
 548         if (skt->ops->suspend)
 549                 skt->ops->suspend(skt);
 550         skt->state |= SOCKET_SUSPEND;
 551
 552         return 0;
 553 }
 554
 555 static int socket_early_resume(struct pcmcia_socket *skt)
 556 {
 557         skt->socket = dead_socket;
 558         skt->ops->init(skt);
 559         skt->ops->set_socket(skt, &skt->socket);
 560         if (skt->state & SOCKET_PRESENT)
 561                 skt->resume_status = socket_setup(skt, resume_delay);
 562         return 0;
 563 }
 564
 565 static int socket_late_resume(struct pcmcia_socket *skt)
 566 {
 567         if (!(skt->state & SOCKET_PRESENT)) {
 568                 skt->state &= ~SOCKET_SUSPEND;
 569                 return socket_insert(skt);
 570         }
 571
 572         if (skt->resume_status == 0) {
 573                 /*
 574                  * FIXME: need a better check here for cardbus cards.
 575                  */
 576                 if (verify_cis_cache(skt) != 0) {
 577                         dev_dbg(&skt->dev, "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                         dev_dbg(&skt->dev, "cis matches cache\n");
 589                         send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
 590                 }
 591         } else {
 592                 socket_shutdown(skt);
 593         }
 594
 595         skt->state &= ~SOCKET_SUSPEND;
 596
 597         return 0;
 598 }
 599
 600 /*
 601  * Resume a socket.  If a card is present, verify its CIS against
 602  * our cached copy.  If they are different, the card has been
 603  * replaced, and we need to tell the drivers.
 604  */
 605 static int socket_resume(struct pcmcia_socket *skt)
 606 {
 607         if (!(skt->state & SOCKET_SUSPEND))
 608                 return -EBUSY;
 609
 610         socket_early_resume(skt);
 611         return socket_late_resume(skt);
 612 }
 613
 614 static void socket_remove(struct pcmcia_socket *skt)
 615 {
 616         dev_printk(KERN_NOTICE, &skt->dev,
 617                    "pccard: card ejected from slot %d\n", skt->sock);
 618         socket_shutdown(skt);
 619 }
 620
 621 /*
 622  * Process a socket card detect status change.
 623  *
 624  * If we don't have a card already present, delay the detect event for
 625  * about 20ms (to be on the safe side) before reading the socket status.
 626  *
 627  * Some i82365-based systems send multiple SS_DETECT events during card
 628  * insertion, and the "card present" status bit seems to bounce.  This
 629  * will probably be true with GPIO-based card detection systems after
 630  * the product has aged.
 631  */
 632 static void socket_detect_change(struct pcmcia_socket *skt)
 633 {
 634         if (!(skt->state & SOCKET_SUSPEND)) {
 635                 int status;
 636
 637                 if (!(skt->state & SOCKET_PRESENT))
 638                         msleep(20);
 639
 640                 skt->ops->get_status(skt, &status);
 641                 if ((skt->state & SOCKET_PRESENT) &&
 642                      !(status & SS_DETECT))
 643                         socket_remove(skt);
 644                 if (!(skt->state & SOCKET_PRESENT) &&
 645                     (status & SS_DETECT))
 646                         socket_insert(skt);
 647         }
 648 }
 649
 650 static int pccardd(void *__skt)
 651 {
 652         struct pcmcia_socket *skt = __skt;
 653         int ret;
 654
 655         skt->thread = current;
 656         skt->socket = dead_socket;
 657         skt->ops->init(skt);
 658         skt->ops->set_socket(skt, &skt->socket);
 659
 660         /* register with the device core */
 661         ret = device_register(&skt->dev);
 662         if (ret) {
 663                 dev_printk(KERN_WARNING, &skt->dev,
 664                            "PCMCIA: unable to register socket\n");
 665                 skt->thread = NULL;
 666                 complete(&skt->thread_done);
 667                 return 0;
 668         }
 669         ret = pccard_sysfs_add_socket(&skt->dev);
 670         if (ret)
 671                 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
 672
 673         complete(&skt->thread_done);
 674
 675         set_freezable();
 676         for (;;) {
 677                 unsigned long flags;
 678                 unsigned int events;
 679
 680                 set_current_state(TASK_INTERRUPTIBLE);
 681
 682                 spin_lock_irqsave(&skt->thread_lock, flags);
 683                 events = skt->thread_events;
 684                 skt->thread_events = 0;
 685                 spin_unlock_irqrestore(&skt->thread_lock, flags);
 686
 687                 if (events) {
 688                         mutex_lock(&skt->skt_mutex);
 689                         if (events & SS_DETECT)
 690                                 socket_detect_change(skt);
 691                         if (events & SS_BATDEAD)
 692                                 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
 693                         if (events & SS_BATWARN)
 694                                 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
 695                         if (events & SS_READY)
 696                                 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
 697                         mutex_unlock(&skt->skt_mutex);
 698                         continue;
 699                 }
 700
 701                 if (kthread_should_stop())
 702                         break;
 703
 704                 schedule();
 705                 try_to_freeze();
 706         }
 707         /* make sure we are running before we exit */
 708         set_current_state(TASK_RUNNING);
 709
 710         /* remove from the device core */
 711         pccard_sysfs_remove_socket(&skt->dev);
 712         device_unregister(&skt->dev);
 713
 714         return 0;
 715 }
 716
 717 /*
 718  * Yenta (at least) probes interrupts before registering the socket and
 719  * starting the handler thread.
 720  */
 721 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
 722 {
 723         unsigned long flags;
 724         dev_dbg(&s->dev, "parse_events: events %08x\n", events);
 725         if (s->thread) {
 726                 spin_lock_irqsave(&s->thread_lock, flags);
 727                 s->thread_events |= events;
 728                 spin_unlock_irqrestore(&s->thread_lock, flags);
 729
 730                 wake_up_process(s->thread);
 731         }
 732 } /* pcmcia_parse_events */
 733 EXPORT_SYMBOL(pcmcia_parse_events);
 734
 735
 736 /* register pcmcia_callback */
 737 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
 738 {
 739         int ret = 0;
 740
 741         /* s->skt_mutex also protects s->callback */
 742         mutex_lock(&s->skt_mutex);
 743
 744         if (c) {
 745                 /* registration */
 746                 if (s->callback) {
 747                         ret = -EBUSY;
 748                         goto err;
 749                 }
 750
 751                 s->callback = c;
 752
 753                 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
 754                         send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 755         } else
 756                 s->callback = NULL;
 757  err:
 758         mutex_unlock(&s->skt_mutex);
 759
 760         return ret;
 761 }
 762 EXPORT_SYMBOL(pccard_register_pcmcia);
 763
 764
 765 /* I'm not sure which "reset" function this is supposed to use,
 766  * but for now, it uses the low-level interface's reset, not the
 767  * CIS register.
 768  */
 769
 770 int pcmcia_reset_card(struct pcmcia_socket *skt)
 771 {
 772         int ret;
 773
 774         dev_dbg(&skt->dev, "resetting socket\n");
 775
 776         mutex_lock(&skt->skt_mutex);
 777         do {
 778                 if (!(skt->state & SOCKET_PRESENT)) {
 779                         dev_dbg(&skt->dev, "can't reset, not present\n");
 780                         ret = -ENODEV;
 781                         break;
 782                 }
 783                 if (skt->state & SOCKET_SUSPEND) {
 784                         dev_dbg(&skt->dev, "can't reset, suspended\n");
 785                         ret = -EBUSY;
 786                         break;
 787                 }
 788                 if (skt->state & SOCKET_CARDBUS) {
 789                         dev_dbg(&skt->dev, "can't reset, is cardbus\n");
 790                         ret = -EPERM;
 791                         break;
 792                 }
 793
 794                 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW);
 795                 if (ret == 0) {
 796                         send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
 797                         if (skt->callback)
 798                                 skt->callback->suspend(skt);
 799                         if (socket_reset(skt) == 0) {
 800                                 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
 801                                 if (skt->callback)
 802                                         skt->callback->resume(skt);
 803                         }
 804                 }
 805
 806                 ret = 0;
 807         } while (0);
 808         mutex_unlock(&skt->skt_mutex);
 809
 810         return ret;
 811 } /* reset_card */
 812 EXPORT_SYMBOL(pcmcia_reset_card);
 813
 814
 815 /* These shut down or wake up a socket.  They are sort of user
 816  * initiated versions of the APM suspend and resume actions.
 817  */
 818 int pcmcia_suspend_card(struct pcmcia_socket *skt)
 819 {
 820         int ret;
 821
 822         dev_dbg(&skt->dev, "suspending socket\n");
 823
 824         mutex_lock(&skt->skt_mutex);
 825         do {
 826                 if (!(skt->state & SOCKET_PRESENT)) {
 827                         ret = -ENODEV;
 828                         break;
 829                 }
 830                 if (skt->state & SOCKET_CARDBUS) {
 831                         ret = -EPERM;
 832                         break;
 833                 }
 834                 if (skt->callback) {
 835                         ret = skt->callback->suspend(skt);
 836                         if (ret)
 837                                 break;
 838                 }
 839                 ret = socket_suspend(skt);
 840         } while (0);
 841         mutex_unlock(&skt->skt_mutex);
 842
 843         return ret;
 844 } /* suspend_card */
 845 EXPORT_SYMBOL(pcmcia_suspend_card);
 846
 847
 848 int pcmcia_resume_card(struct pcmcia_socket *skt)
 849 {
 850         int ret;
 851
 852         dev_dbg(&skt->dev, "waking up socket\n");
 853
 854         mutex_lock(&skt->skt_mutex);
 855         do {
 856                 if (!(skt->state & SOCKET_PRESENT)) {
 857                         ret = -ENODEV;
 858                         break;
 859                 }
 860                 if (skt->state & SOCKET_CARDBUS) {
 861                         ret = -EPERM;
 862                         break;
 863                 }
 864                 ret = socket_resume(skt);
 865                 if (!ret && skt->callback)
 866                         skt->callback->resume(skt);
 867         } while (0);
 868         mutex_unlock(&skt->skt_mutex);
 869
 870         return ret;
 871 } /* resume_card */
 872 EXPORT_SYMBOL(pcmcia_resume_card);
 873
 874
 875 /* These handle user requests to eject or insert a card. */
 876 int pcmcia_eject_card(struct pcmcia_socket *skt)
 877 {
 878         int ret;
 879
 880         dev_dbg(&skt->dev, "user eject request\n");
 881
 882         mutex_lock(&skt->skt_mutex);
 883         do {
 884                 if (!(skt->state & SOCKET_PRESENT)) {
 885                         ret = -ENODEV;
 886                         break;
 887                 }
 888
 889                 ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW);
 890                 if (ret != 0) {
 891                         ret = -EINVAL;
 892                         break;
 893                 }
 894
 895                 socket_remove(skt);
 896                 ret = 0;
 897         } while (0);
 898         mutex_unlock(&skt->skt_mutex);
 899
 900         return ret;
 901 } /* eject_card */
 902 EXPORT_SYMBOL(pcmcia_eject_card);
 903
 904
 905 int pcmcia_insert_card(struct pcmcia_socket *skt)
 906 {
 907         int ret;
 908
 909         dev_dbg(&skt->dev, "user insert request\n");
 910
 911         mutex_lock(&skt->skt_mutex);
 912         do {
 913                 if (skt->state & SOCKET_PRESENT) {
 914                         ret = -EBUSY;
 915                         break;
 916                 }
 917                 if (socket_insert(skt) == -ENODEV) {
 918                         ret = -ENODEV;
 919                         break;
 920                 }
 921                 ret = 0;
 922         } while (0);
 923         mutex_unlock(&skt->skt_mutex);
 924
 925         return ret;
 926 } /* insert_card */
 927 EXPORT_SYMBOL(pcmcia_insert_card);
 928
 929
 930 static int pcmcia_socket_uevent(struct device *dev,
 931                                 struct kobj_uevent_env *env)
 932 {
 933         struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 934
 935         if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
 936                 return -ENOMEM;
 937
 938         return 0;
 939 }
 940
 941
 942 static struct completion pcmcia_unload;
 943
 944 static void pcmcia_release_socket_class(struct class *data)
 945 {
 946         complete(&pcmcia_unload);
 947 }
 948
 949
 950 struct class pcmcia_socket_class = {
 951         .name = "pcmcia_socket",
 952         .dev_uevent = pcmcia_socket_uevent,
 953         .dev_release = pcmcia_release_socket,
 954         .class_release = pcmcia_release_socket_class,
 955 };
 956 EXPORT_SYMBOL(pcmcia_socket_class);
 957
 958
 959 static int __init init_pcmcia_cs(void)
 960 {
 961         init_completion(&pcmcia_unload);
 962         return class_register(&pcmcia_socket_class);
 963 }
 964
 965 static void __exit exit_pcmcia_cs(void)
 966 {
 967         class_unregister(&pcmcia_socket_class);
 968         wait_for_completion(&pcmcia_unload);
 969 }
 970
 971 subsys_initcall(init_pcmcia_cs);
 972 module_exit(exit_pcmcia_cs);
 973