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 struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt)
  80 {
  81         struct device *dev = get_device(&skt->dev);
  82         if (!dev)
  83                 return NULL;
  84         return dev_get_drvdata(dev);
  85 }
  86 EXPORT_SYMBOL(pcmcia_get_socket);
  87
  88
  89 void pcmcia_put_socket(struct pcmcia_socket *skt)
  90 {
  91         put_device(&skt->dev);
  92 }
  93 EXPORT_SYMBOL(pcmcia_put_socket);
  94
  95
  96 static void pcmcia_release_socket(struct device *dev)
  97 {
  98         struct pcmcia_socket *socket = dev_get_drvdata(dev);
  99
 100         complete(&socket->socket_released);
 101 }
 102
 103 static int pccardd(void *__skt);
 104
 105 /**
 106  * pcmcia_register_socket - add a new pcmcia socket device
 107  * @socket: the &socket to register
 108  */
 109 int pcmcia_register_socket(struct pcmcia_socket *socket)
 110 {
 111         struct task_struct *tsk;
 112         int ret;
 113
 114         if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
 115                 return -EINVAL;
 116
 117         dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);
 118
 119         /* try to obtain a socket number [yes, it gets ugly if we
 120          * register more than 2^sizeof(unsigned int) pcmcia
 121          * sockets... but the socket number is deprecated
 122          * anyways, so I don't care] */
 123         down_write(&pcmcia_socket_list_rwsem);
 124         if (list_empty(&pcmcia_socket_list))
 125                 socket->sock = 0;
 126         else {
 127                 unsigned int found, i = 1;
 128                 struct pcmcia_socket *tmp;
 129                 do {
 130                         found = 1;
 131                         list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
 132                                 if (tmp->sock == i)
 133                                         found = 0;
 134                         }
 135                         i++;
 136                 } while (!found);
 137                 socket->sock = i - 1;
 138         }
 139         list_add_tail(&socket->socket_list, &pcmcia_socket_list);
 140         up_write(&pcmcia_socket_list_rwsem);
 141
 142 #ifndef CONFIG_CARDBUS
 143         /*
 144          * If we do not support Cardbus, ensure that
 145          * the Cardbus socket capability is disabled.
 146          */
 147         socket->features &= ~SS_CAP_CARDBUS;
 148 #endif
 149
 150         /* set proper values in socket->dev */
 151         dev_set_drvdata(&socket->dev, socket);
 152         socket->dev.class = &pcmcia_socket_class;
 153         dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock);
 154
 155         /* base address = 0, map = 0 */
 156         socket->cis_mem.flags = 0;
 157         socket->cis_mem.speed = cis_speed;
 158
 159         INIT_LIST_HEAD(&socket->cis_cache);
 160
 161         init_completion(&socket->socket_released);
 162         init_completion(&socket->thread_done);
 163         mutex_init(&socket->skt_mutex);
 164         mutex_init(&socket->ops_mutex);
 165         spin_lock_init(&socket->thread_lock);
 166
 167         if (socket->resource_ops->init) {
 168                 mutex_lock(&socket->ops_mutex);
 169                 ret = socket->resource_ops->init(socket);
 170                 mutex_unlock(&socket->ops_mutex);
 171                 if (ret)
 172                         goto err;
 173         }
 174
 175         tsk = kthread_run(pccardd, socket, "pccardd");
 176         if (IS_ERR(tsk)) {
 177                 ret = PTR_ERR(tsk);
 178                 goto err;
 179         }
 180
 181         wait_for_completion(&socket->thread_done);
 182         if (!socket->thread) {
 183                 dev_printk(KERN_WARNING, &socket->dev,
 184                            "PCMCIA: warning: socket thread did not start\n");
 185                 return -EIO;
 186         }
 187
 188         pcmcia_parse_events(socket, SS_DETECT);
 189
 190         /*
 191          * Let's try to get the PCMCIA module for 16-bit PCMCIA support.
 192          * If it fails, it doesn't matter -- we still have 32-bit CardBus
 193          * support to offer, so this is not a failure mode.
 194          */
 195         request_module_nowait("pcmcia");
 196
 197         return 0;
 198
 199  err:
 200         down_write(&pcmcia_socket_list_rwsem);
 201         list_del(&socket->socket_list);
 202         up_write(&pcmcia_socket_list_rwsem);
 203         return ret;
 204 } /* pcmcia_register_socket */
 205 EXPORT_SYMBOL(pcmcia_register_socket);
 206
 207
 208 /**
 209  * pcmcia_unregister_socket - remove a pcmcia socket device
 210  * @socket: the &socket to unregister
 211  */
 212 void pcmcia_unregister_socket(struct pcmcia_socket *socket)
 213 {
 214         if (!socket)
 215                 return;
 216
 217         dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
 218
 219         if (socket->thread)
 220                 kthread_stop(socket->thread);
 221
 222         /* remove from our own list */
 223         down_write(&pcmcia_socket_list_rwsem);
 224         list_del(&socket->socket_list);
 225         up_write(&pcmcia_socket_list_rwsem);
 226
 227         /* wait for sysfs to drop all references */
 228         if (socket->resource_ops->exit) {
 229                 mutex_lock(&socket->ops_mutex);
 230                 socket->resource_ops->exit(socket);
 231                 mutex_unlock(&socket->ops_mutex);
 232         }
 233         wait_for_completion(&socket->socket_released);
 234 } /* pcmcia_unregister_socket */
 235 EXPORT_SYMBOL(pcmcia_unregister_socket);
 236
 237
 238 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr)
 239 {
 240         struct pcmcia_socket *s;
 241
 242         down_read(&pcmcia_socket_list_rwsem);
 243         list_for_each_entry(s, &pcmcia_socket_list, socket_list)
 244                 if (s->sock == nr) {
 245                         up_read(&pcmcia_socket_list_rwsem);
 246                         return s;
 247                 }
 248         up_read(&pcmcia_socket_list_rwsem);
 249
 250         return NULL;
 251
 252 }
 253 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
 254
 255 /*
 256  * The central event handler.  Send_event() sends an event to the
 257  * 16-bit subsystem, which then calls the relevant device drivers.
 258  * Parse_events() interprets the event bits from
 259  * a card status change report.  Do_shutdown() handles the high
 260  * priority stuff associated with a card removal.
 261  */
 262
 263 /* NOTE: send_event needs to be called with skt->sem held. */
 264
 265 static int send_event(struct pcmcia_socket *s, event_t event, int priority)
 266 {
 267         int ret;
 268
 269         if ((s->state & SOCKET_CARDBUS) && (event != CS_EVENT_CARD_REMOVAL))
 270                 return 0;
 271
 272         dev_dbg(&s->dev, "send_event(event %d, pri %d, callback 0x%p)\n",
 273            event, priority, s->callback);
 274
 275         if (!s->callback)
 276                 return 0;
 277         if (!try_module_get(s->callback->owner))
 278                 return 0;
 279
 280         ret = s->callback->event(s, event, priority);
 281
 282         module_put(s->callback->owner);
 283
 284         return ret;
 285 }
 286
 287 static int socket_reset(struct pcmcia_socket *skt)
 288 {
 289         int status, i;
 290
 291         dev_dbg(&skt->dev, "reset\n");
 292
 293         skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
 294         skt->ops->set_socket(skt, &skt->socket);
 295         udelay((long)reset_time);
 296
 297         skt->socket.flags &= ~SS_RESET;
 298         skt->ops->set_socket(skt, &skt->socket);
 299
 300         msleep(unreset_delay * 10);
 301         for (i = 0; i < unreset_limit; i++) {
 302                 skt->ops->get_status(skt, &status);
 303
 304                 if (!(status & SS_DETECT))
 305                         return -ENODEV;
 306
 307                 if (status & SS_READY)
 308                         return 0;
 309
 310                 msleep(unreset_check * 10);
 311         }
 312
 313         dev_printk(KERN_ERR, &skt->dev, "time out after reset.\n");
 314         return -ETIMEDOUT;
 315 }
 316
 317 /*
 318  * socket_setup() and socket_shutdown() are called by the main event handler
 319  * when card insertion and removal events are received.
 320  * socket_setup() turns on socket power and resets the socket, in two stages.
 321  * socket_shutdown() unconfigures a socket and turns off socket power.
 322  */
 323 static void socket_shutdown(struct pcmcia_socket *s)
 324 {
 325         int status;
 326
 327         dev_dbg(&s->dev, "shutdown\n");
 328
 329         send_event(s, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
 330
 331         mutex_lock(&s->ops_mutex);
 332         s->state &= SOCKET_INUSE | SOCKET_PRESENT;
 333         msleep(shutdown_delay * 10);
 334         s->state &= SOCKET_INUSE;
 335
 336         /* Blank out the socket state */
 337         s->socket = dead_socket;
 338         s->ops->init(s);
 339         s->ops->set_socket(s, &s->socket);
 340         s->lock_count = 0;
 341         kfree(s->fake_cis);
 342         s->fake_cis = NULL;
 343         s->functions = 0;
 344
 345         /* From here on we can be sure that only we (that is, the
 346          * pccardd thread) accesses this socket, and all (16-bit)
 347          * PCMCIA interactions are gone. Therefore, release
 348          * ops_mutex so that we don't get a sysfs-related lockdep
 349          * warning.
 350          */
 351         mutex_unlock(&s->ops_mutex);
 352
 353 #ifdef CONFIG_CARDBUS
 354         cb_free(s);
 355 #endif
 356
 357         /* give socket some time to power down */
 358         msleep(100);
 359
 360         s->ops->get_status(s, &status);
 361         if (status & SS_POWERON) {
 362                 dev_printk(KERN_ERR, &s->dev,
 363                            "*** DANGER *** unable to remove socket power\n");
 364         }
 365
 366         s->state &= ~SOCKET_INUSE;
 367 }
 368
 369 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
 370 {
 371         int status, i;
 372
 373         dev_dbg(&skt->dev, "setup\n");
 374
 375         skt->ops->get_status(skt, &status);
 376         if (!(status & SS_DETECT))
 377                 return -ENODEV;
 378
 379         msleep(initial_delay * 10);
 380
 381         for (i = 0; i < 100; i++) {
 382                 skt->ops->get_status(skt, &status);
 383                 if (!(status & SS_DETECT))
 384                         return -ENODEV;
 385
 386                 if (!(status & SS_PENDING))
 387                         break;
 388
 389                 msleep(100);
 390         }
 391
 392         if (status & SS_PENDING) {
 393                 dev_printk(KERN_ERR, &skt->dev,
 394                            "voltage interrogation timed out.\n");
 395                 return -ETIMEDOUT;
 396         }
 397
 398         if (status & SS_CARDBUS) {
 399                 if (!(skt->features & SS_CAP_CARDBUS)) {
 400                         dev_printk(KERN_ERR, &skt->dev,
 401                                 "cardbus cards are not supported.\n");
 402                         return -EINVAL;
 403                 }
 404                 skt->state |= SOCKET_CARDBUS;
 405         } else
 406                 skt->state &= ~SOCKET_CARDBUS;
 407
 408         /*
 409          * Decode the card voltage requirements, and apply power to the card.
 410          */
 411         if (status & SS_3VCARD)
 412                 skt->socket.Vcc = skt->socket.Vpp = 33;
 413         else if (!(status & SS_XVCARD))
 414                 skt->socket.Vcc = skt->socket.Vpp = 50;
 415         else {
 416                 dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n");
 417                 return -EIO;
 418         }
 419
 420         if (skt->power_hook)
 421                 skt->power_hook(skt, HOOK_POWER_PRE);
 422
 423         skt->socket.flags = 0;
 424         skt->ops->set_socket(skt, &skt->socket);
 425
 426         /*
 427          * Wait "vcc_settle" for the supply to stabilise.
 428          */
 429         msleep(vcc_settle * 10);
 430
 431         skt->ops->get_status(skt, &status);
 432         if (!(status & SS_POWERON)) {
 433                 dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n");
 434                 return -EIO;
 435         }
 436
 437         status = socket_reset(skt);
 438
 439         if (skt->power_hook)
 440                 skt->power_hook(skt, HOOK_POWER_POST);
 441
 442         return status;
 443 }
 444
 445 /*
 446  * Handle card insertion.  Setup the socket, reset the card,
 447  * and then tell the rest of PCMCIA that a card is present.
 448  */
 449 static int socket_insert(struct pcmcia_socket *skt)
 450 {
 451         int ret;
 452
 453         dev_dbg(&skt->dev, "insert\n");
 454
 455         mutex_lock(&skt->ops_mutex);
 456         if (skt->state & SOCKET_INUSE) {
 457                 mutex_unlock(&skt->ops_mutex);
 458                 return -EINVAL;
 459         }
 460         skt->state |= SOCKET_INUSE;
 461
 462         ret = socket_setup(skt, setup_delay);
 463         if (ret == 0) {
 464                 skt->state |= SOCKET_PRESENT;
 465
 466                 dev_printk(KERN_NOTICE, &skt->dev,
 467                            "pccard: %s card inserted into slot %d\n",
 468                            (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
 469                            skt->sock);
 470
 471 #ifdef CONFIG_CARDBUS
 472                 if (skt->state & SOCKET_CARDBUS) {
 473                         cb_alloc(skt);
 474                         skt->state |= SOCKET_CARDBUS_CONFIG;
 475                 }
 476 #endif
 477                 dev_dbg(&skt->dev, "insert done\n");
 478                 mutex_unlock(&skt->ops_mutex);
 479
 480                 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 481         } else {
 482                 mutex_unlock(&skt->ops_mutex);
 483                 socket_shutdown(skt);
 484         }
 485
 486         return ret;
 487 }
 488
 489 static int socket_suspend(struct pcmcia_socket *skt)
 490 {
 491         if (skt->state & SOCKET_SUSPEND)
 492                 return -EBUSY;
 493
 494         mutex_lock(&skt->ops_mutex);
 495         skt->suspended_state = skt->state;
 496
 497         send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
 498         skt->socket = dead_socket;
 499         skt->ops->set_socket(skt, &skt->socket);
 500         if (skt->ops->suspend)
 501                 skt->ops->suspend(skt);
 502         skt->state |= SOCKET_SUSPEND;
 503         mutex_unlock(&skt->ops_mutex);
 504         return 0;
 505 }
 506
 507 static int socket_early_resume(struct pcmcia_socket *skt)
 508 {
 509         mutex_lock(&skt->ops_mutex);
 510         skt->socket = dead_socket;
 511         skt->ops->init(skt);
 512         skt->ops->set_socket(skt, &skt->socket);
 513         if (skt->state & SOCKET_PRESENT)
 514                 skt->resume_status = socket_setup(skt, resume_delay);
 515         mutex_unlock(&skt->ops_mutex);
 516         return 0;
 517 }
 518
 519 static int socket_late_resume(struct pcmcia_socket *skt)
 520 {
 521         int ret;
 522
 523         mutex_lock(&skt->ops_mutex);
 524         skt->state &= ~SOCKET_SUSPEND;
 525         mutex_unlock(&skt->ops_mutex);
 526
 527         if (!(skt->state & SOCKET_PRESENT)) {
 528                 ret = socket_insert(skt);
 529                 if (ret == -ENODEV)
 530                         ret = 0;
 531                 return ret;
 532         }
 533
 534         if (skt->resume_status) {
 535                 socket_shutdown(skt);
 536                 return 0;
 537         }
 538
 539         if (skt->suspended_state != skt->state) {
 540                 dev_dbg(&skt->dev,
 541                         "suspend state 0x%x != resume state 0x%x\n",
 542                         skt->suspended_state, skt->state);
 543
 544                 socket_shutdown(skt);
 545                 return socket_insert(skt);
 546         }
 547
 548 #ifdef CONFIG_CARDBUS
 549         if (skt->state & SOCKET_CARDBUS) {
 550                 /* We can't be sure the CardBus card is the same
 551                  * as the one previously inserted. Therefore, remove
 552                  * and re-add... */
 553                 cb_free(skt);
 554                 cb_alloc(skt);
 555                 return 0;
 556         }
 557 #endif
 558
 559         send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
 560         return 0;
 561 }
 562
 563 /*
 564  * Resume a socket.  If a card is present, verify its CIS against
 565  * our cached copy.  If they are different, the card has been
 566  * replaced, and we need to tell the drivers.
 567  */
 568 static int socket_resume(struct pcmcia_socket *skt)
 569 {
 570         if (!(skt->state & SOCKET_SUSPEND))
 571                 return -EBUSY;
 572
 573         socket_early_resume(skt);
 574         return socket_late_resume(skt);
 575 }
 576
 577 static void socket_remove(struct pcmcia_socket *skt)
 578 {
 579         dev_printk(KERN_NOTICE, &skt->dev,
 580                    "pccard: card ejected from slot %d\n", skt->sock);
 581         socket_shutdown(skt);
 582 }
 583
 584 /*
 585  * Process a socket card detect status change.
 586  *
 587  * If we don't have a card already present, delay the detect event for
 588  * about 20ms (to be on the safe side) before reading the socket status.
 589  *
 590  * Some i82365-based systems send multiple SS_DETECT events during card
 591  * insertion, and the "card present" status bit seems to bounce.  This
 592  * will probably be true with GPIO-based card detection systems after
 593  * the product has aged.
 594  */
 595 static void socket_detect_change(struct pcmcia_socket *skt)
 596 {
 597         if (!(skt->state & SOCKET_SUSPEND)) {
 598                 int status;
 599
 600                 if (!(skt->state & SOCKET_PRESENT))
 601                         msleep(20);
 602
 603                 skt->ops->get_status(skt, &status);
 604                 if ((skt->state & SOCKET_PRESENT) &&
 605                      !(status & SS_DETECT))
 606                         socket_remove(skt);
 607                 if (!(skt->state & SOCKET_PRESENT) &&
 608                     (status & SS_DETECT))
 609                         socket_insert(skt);
 610         }
 611 }
 612
 613 static int pccardd(void *__skt)
 614 {
 615         struct pcmcia_socket *skt = __skt;
 616         int ret;
 617
 618         skt->thread = current;
 619         skt->socket = dead_socket;
 620         skt->ops->init(skt);
 621         skt->ops->set_socket(skt, &skt->socket);
 622
 623         /* register with the device core */
 624         ret = device_register(&skt->dev);
 625         if (ret) {
 626                 dev_printk(KERN_WARNING, &skt->dev,
 627                            "PCMCIA: unable to register socket\n");
 628                 skt->thread = NULL;
 629                 complete(&skt->thread_done);
 630                 return 0;
 631         }
 632         ret = pccard_sysfs_add_socket(&skt->dev);
 633         if (ret)
 634                 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
 635
 636         complete(&skt->thread_done);
 637
 638         /* wait for userspace to catch up */
 639         msleep(250);
 640
 641         set_freezable();
 642         for (;;) {
 643                 unsigned long flags;
 644                 unsigned int events;
 645                 unsigned int sysfs_events;
 646
 647                 set_current_state(TASK_INTERRUPTIBLE);
 648
 649                 spin_lock_irqsave(&skt->thread_lock, flags);
 650                 events = skt->thread_events;
 651                 skt->thread_events = 0;
 652                 sysfs_events = skt->sysfs_events;
 653                 skt->sysfs_events = 0;
 654                 spin_unlock_irqrestore(&skt->thread_lock, flags);
 655
 656                 mutex_lock(&skt->skt_mutex);
 657                 if (events) {
 658                         if (events & SS_DETECT)
 659                                 socket_detect_change(skt);
 660                         if (events & SS_BATDEAD)
 661                                 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
 662                         if (events & SS_BATWARN)
 663                                 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
 664                         if (events & SS_READY)
 665                                 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
 666                 }
 667
 668                 if (sysfs_events) {
 669                         if (sysfs_events & PCMCIA_UEVENT_EJECT)
 670                                 socket_remove(skt);
 671                         if (sysfs_events & PCMCIA_UEVENT_INSERT)
 672                                 socket_insert(skt);
 673                         if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) &&
 674                                 !(skt->state & SOCKET_CARDBUS)) {
 675                                 if (skt->callback)
 676                                         ret = skt->callback->suspend(skt);
 677                                 else
 678                                         ret = 0;
 679                                 if (!ret) {
 680                                         socket_suspend(skt);
 681                                         msleep(100);
 682                                 }
 683                         }
 684                         if ((sysfs_events & PCMCIA_UEVENT_RESUME) &&
 685                                 !(skt->state & SOCKET_CARDBUS)) {
 686                                 ret = socket_resume(skt);
 687                                 if (!ret && skt->callback)
 688                                         skt->callback->resume(skt);
 689                         }
 690                         if ((sysfs_events & PCMCIA_UEVENT_REQUERY) &&
 691                                 !(skt->state & SOCKET_CARDBUS)) {
 692                                 if (!ret && skt->callback)
 693                                         skt->callback->requery(skt);
 694                         }
 695                 }
 696                 mutex_unlock(&skt->skt_mutex);
 697
 698                 if (events || sysfs_events)
 699                         continue;
 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         /* shut down socket, if a device is still present */
 711         if (skt->state & SOCKET_PRESENT) {
 712                 mutex_lock(&skt->skt_mutex);
 713                 socket_remove(skt);
 714                 mutex_unlock(&skt->skt_mutex);
 715         }
 716
 717         /* remove from the device core */
 718         pccard_sysfs_remove_socket(&skt->dev);
 719         device_unregister(&skt->dev);
 720
 721         return 0;
 722 }
 723
 724 /*
 725  * Yenta (at least) probes interrupts before registering the socket and
 726  * starting the handler thread.
 727  */
 728 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
 729 {
 730         unsigned long flags;
 731         dev_dbg(&s->dev, "parse_events: events %08x\n", events);
 732         if (s->thread) {
 733                 spin_lock_irqsave(&s->thread_lock, flags);
 734                 s->thread_events |= events;
 735                 spin_unlock_irqrestore(&s->thread_lock, flags);
 736
 737                 wake_up_process(s->thread);
 738         }
 739 } /* pcmcia_parse_events */
 740 EXPORT_SYMBOL(pcmcia_parse_events);
 741
 742 /**
 743  * pcmcia_parse_uevents() - tell pccardd to issue manual commands
 744  * @s:          the PCMCIA socket we wan't to command
 745  * @events:     events to pass to pccardd
 746  *
 747  * userspace-issued insert, eject, suspend and resume commands must be
 748  * handled by pccardd to avoid any sysfs-related deadlocks. Valid events
 749  * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert),
 750  * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend)
 751  * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card).
 752  */
 753 void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events)
 754 {
 755         unsigned long flags;
 756         dev_dbg(&s->dev, "parse_uevents: events %08x\n", events);
 757         if (s->thread) {
 758                 spin_lock_irqsave(&s->thread_lock, flags);
 759                 s->sysfs_events |= events;
 760                 spin_unlock_irqrestore(&s->thread_lock, flags);
 761
 762                 wake_up_process(s->thread);
 763         }
 764 }
 765 EXPORT_SYMBOL(pcmcia_parse_uevents);
 766
 767
 768 /* register pcmcia_callback */
 769 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
 770 {
 771         int ret = 0;
 772
 773         /* s->skt_mutex also protects s->callback */
 774         mutex_lock(&s->skt_mutex);
 775
 776         if (c) {
 777                 /* registration */
 778                 if (s->callback) {
 779                         ret = -EBUSY;
 780                         goto err;
 781                 }
 782
 783                 s->callback = c;
 784
 785                 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
 786                         send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 787         } else
 788                 s->callback = NULL;
 789  err:
 790         mutex_unlock(&s->skt_mutex);
 791
 792         return ret;
 793 }
 794 EXPORT_SYMBOL(pccard_register_pcmcia);
 795
 796
 797 /* I'm not sure which "reset" function this is supposed to use,
 798  * but for now, it uses the low-level interface's reset, not the
 799  * CIS register.
 800  */
 801
 802 int pcmcia_reset_card(struct pcmcia_socket *skt)
 803 {
 804         int ret;
 805
 806         dev_dbg(&skt->dev, "resetting socket\n");
 807
 808         mutex_lock(&skt->skt_mutex);
 809         do {
 810                 if (!(skt->state & SOCKET_PRESENT)) {
 811                         dev_dbg(&skt->dev, "can't reset, not present\n");
 812                         ret = -ENODEV;
 813                         break;
 814                 }
 815                 if (skt->state & SOCKET_SUSPEND) {
 816                         dev_dbg(&skt->dev, "can't reset, suspended\n");
 817                         ret = -EBUSY;
 818                         break;
 819                 }
 820                 if (skt->state & SOCKET_CARDBUS) {
 821                         dev_dbg(&skt->dev, "can't reset, is cardbus\n");
 822                         ret = -EPERM;
 823                         break;
 824                 }
 825
 826                 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW);
 827                 if (ret == 0) {
 828                         send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
 829                         if (skt->callback)
 830                                 skt->callback->suspend(skt);
 831                         mutex_lock(&skt->ops_mutex);
 832                         ret = socket_reset(skt);
 833                         mutex_unlock(&skt->ops_mutex);
 834                         if (ret == 0) {
 835                                 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
 836                                 if (skt->callback)
 837                                         skt->callback->resume(skt);
 838                         }
 839                 }
 840
 841                 ret = 0;
 842         } while (0);
 843         mutex_unlock(&skt->skt_mutex);
 844
 845         return ret;
 846 } /* reset_card */
 847 EXPORT_SYMBOL(pcmcia_reset_card);
 848
 849
 850 static int pcmcia_socket_uevent(struct device *dev,
 851                                 struct kobj_uevent_env *env)
 852 {
 853         struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 854
 855         if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
 856                 return -ENOMEM;
 857
 858         return 0;
 859 }
 860
 861
 862 static struct completion pcmcia_unload;
 863
 864 static void pcmcia_release_socket_class(struct class *data)
 865 {
 866         complete(&pcmcia_unload);
 867 }
 868
 869
 870 #ifdef CONFIG_PM
 871
 872 static int __pcmcia_pm_op(struct device *dev,
 873                           int (*callback) (struct pcmcia_socket *skt))
 874 {
 875         struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 876         int ret;
 877
 878         mutex_lock(&s->skt_mutex);
 879         ret = callback(s);
 880         mutex_unlock(&s->skt_mutex);
 881
 882         return ret;
 883 }
 884
 885 static int pcmcia_socket_dev_suspend_noirq(struct device *dev)
 886 {
 887         return __pcmcia_pm_op(dev, socket_suspend);
 888 }
 889
 890 static int pcmcia_socket_dev_resume_noirq(struct device *dev)
 891 {
 892         return __pcmcia_pm_op(dev, socket_early_resume);
 893 }
 894
 895 static int pcmcia_socket_dev_resume(struct device *dev)
 896 {
 897         return __pcmcia_pm_op(dev, socket_late_resume);
 898 }
 899
 900 static const struct dev_pm_ops pcmcia_socket_pm_ops = {
 901         /* dev_resume may be called with IRQs enabled */
 902         SET_SYSTEM_SLEEP_PM_OPS(NULL,
 903                                 pcmcia_socket_dev_resume)
 904
 905         /* late suspend must be called with IRQs disabled */
 906         .suspend_noirq = pcmcia_socket_dev_suspend_noirq,
 907         .freeze_noirq = pcmcia_socket_dev_suspend_noirq,
 908         .poweroff_noirq = pcmcia_socket_dev_suspend_noirq,
 909
 910         /* early resume must be called with IRQs disabled */
 911         .resume_noirq = pcmcia_socket_dev_resume_noirq,
 912         .thaw_noirq = pcmcia_socket_dev_resume_noirq,
 913         .restore_noirq = pcmcia_socket_dev_resume_noirq,
 914 };
 915
 916 #define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops)
 917
 918 #else /* CONFIG_PM */
 919
 920 #define PCMCIA_SOCKET_CLASS_PM_OPS NULL
 921
 922 #endif /* CONFIG_PM */
 923
 924 struct class pcmcia_socket_class = {
 925         .name = "pcmcia_socket",
 926         .dev_uevent = pcmcia_socket_uevent,
 927         .dev_release = pcmcia_release_socket,
 928         .class_release = pcmcia_release_socket_class,
 929         .pm = PCMCIA_SOCKET_CLASS_PM_OPS,
 930 };
 931 EXPORT_SYMBOL(pcmcia_socket_class);
 932
 933
 934 static int __init init_pcmcia_cs(void)
 935 {
 936         init_completion(&pcmcia_unload);
 937         return class_register(&pcmcia_socket_class);
 938 }
 939
 940 static void __exit exit_pcmcia_cs(void)
 941 {
 942         class_unregister(&pcmcia_socket_class);
 943         wait_for_completion(&pcmcia_unload);
 944 }
 945
 946 subsys_initcall(init_pcmcia_cs);
 947 module_exit(exit_pcmcia_cs);
 948