linux/drivers/pcmcia/cs.c
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   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/ss.h>
  36#include <pcmcia/cistpl.h>
  37#include <pcmcia/cisreg.h>
  38#include <pcmcia/ds.h>
  39#include "cs_internal.h"
  40
  41
  42/* Module parameters */
  43
  44MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
  45MODULE_DESCRIPTION("Linux Kernel Card Services");
  46MODULE_LICENSE("GPL");
  47
  48#define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
  49
  50INT_MODULE_PARM(setup_delay,    10);            /* centiseconds */
  51INT_MODULE_PARM(resume_delay,   20);            /* centiseconds */
  52INT_MODULE_PARM(shutdown_delay, 3);             /* centiseconds */
  53INT_MODULE_PARM(vcc_settle,     40);            /* centiseconds */
  54INT_MODULE_PARM(reset_time,     10);            /* usecs */
  55INT_MODULE_PARM(unreset_delay,  10);            /* centiseconds */
  56INT_MODULE_PARM(unreset_check,  10);            /* centiseconds */
  57INT_MODULE_PARM(unreset_limit,  30);            /* unreset_check's */
  58
  59/* Access speed for attribute memory windows */
  60INT_MODULE_PARM(cis_speed,      300);           /* ns */
  61
  62
  63socket_state_t dead_socket = {
  64        .csc_mask       = SS_DETECT,
  65};
  66EXPORT_SYMBOL(dead_socket);
  67
  68
  69/* List of all sockets, protected by a rwsem */
  70LIST_HEAD(pcmcia_socket_list);
  71EXPORT_SYMBOL(pcmcia_socket_list);
  72
  73DECLARE_RWSEM(pcmcia_socket_list_rwsem);
  74EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
  75
  76
  77struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt)
  78{
  79        struct device *dev = get_device(&skt->dev);
  80        if (!dev)
  81                return NULL;
  82        return dev_get_drvdata(dev);
  83}
  84EXPORT_SYMBOL(pcmcia_get_socket);
  85
  86
  87void pcmcia_put_socket(struct pcmcia_socket *skt)
  88{
  89        put_device(&skt->dev);
  90}
  91EXPORT_SYMBOL(pcmcia_put_socket);
  92
  93
  94static void pcmcia_release_socket(struct device *dev)
  95{
  96        struct pcmcia_socket *socket = dev_get_drvdata(dev);
  97
  98        complete(&socket->socket_released);
  99}
 100
 101static int pccardd(void *__skt);
 102
 103/**
 104 * pcmcia_register_socket - add a new pcmcia socket device
 105 * @socket: the &socket to register
 106 */
 107int pcmcia_register_socket(struct pcmcia_socket *socket)
 108{
 109        struct task_struct *tsk;
 110        int ret;
 111
 112        if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
 113                return -EINVAL;
 114
 115        dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);
 116
 117        /* try to obtain a socket number [yes, it gets ugly if we
 118         * register more than 2^sizeof(unsigned int) pcmcia
 119         * sockets... but the socket number is deprecated
 120         * anyways, so I don't care] */
 121        down_write(&pcmcia_socket_list_rwsem);
 122        if (list_empty(&pcmcia_socket_list))
 123                socket->sock = 0;
 124        else {
 125                unsigned int found, i = 1;
 126                struct pcmcia_socket *tmp;
 127                do {
 128                        found = 1;
 129                        list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
 130                                if (tmp->sock == i)
 131                                        found = 0;
 132                        }
 133                        i++;
 134                } while (!found);
 135                socket->sock = i - 1;
 136        }
 137        list_add_tail(&socket->socket_list, &pcmcia_socket_list);
 138        up_write(&pcmcia_socket_list_rwsem);
 139
 140#ifndef CONFIG_CARDBUS
 141        /*
 142         * If we do not support Cardbus, ensure that
 143         * the Cardbus socket capability is disabled.
 144         */
 145        socket->features &= ~SS_CAP_CARDBUS;
 146#endif
 147
 148        /* set proper values in socket->dev */
 149        dev_set_drvdata(&socket->dev, socket);
 150        socket->dev.class = &pcmcia_socket_class;
 151        dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock);
 152
 153        /* base address = 0, map = 0 */
 154        socket->cis_mem.flags = 0;
 155        socket->cis_mem.speed = cis_speed;
 156
 157        INIT_LIST_HEAD(&socket->cis_cache);
 158
 159        init_completion(&socket->socket_released);
 160        init_completion(&socket->thread_done);
 161        mutex_init(&socket->skt_mutex);
 162        mutex_init(&socket->ops_mutex);
 163        spin_lock_init(&socket->thread_lock);
 164
 165        if (socket->resource_ops->init) {
 166                mutex_lock(&socket->ops_mutex);
 167                ret = socket->resource_ops->init(socket);
 168                mutex_unlock(&socket->ops_mutex);
 169                if (ret)
 170                        goto err;
 171        }
 172
 173        tsk = kthread_run(pccardd, socket, "pccardd");
 174        if (IS_ERR(tsk)) {
 175                ret = PTR_ERR(tsk);
 176                goto err;
 177        }
 178
 179        wait_for_completion(&socket->thread_done);
 180        if (!socket->thread) {
 181                dev_printk(KERN_WARNING, &socket->dev,
 182                           "PCMCIA: warning: socket thread did not start\n");
 183                return -EIO;
 184        }
 185
 186        pcmcia_parse_events(socket, SS_DETECT);
 187
 188        /*
 189         * Let's try to get the PCMCIA module for 16-bit PCMCIA support.
 190         * If it fails, it doesn't matter -- we still have 32-bit CardBus
 191         * support to offer, so this is not a failure mode.
 192         */
 193        request_module_nowait("pcmcia");
 194
 195        return 0;
 196
 197 err:
 198        down_write(&pcmcia_socket_list_rwsem);
 199        list_del(&socket->socket_list);
 200        up_write(&pcmcia_socket_list_rwsem);
 201        return ret;
 202} /* pcmcia_register_socket */
 203EXPORT_SYMBOL(pcmcia_register_socket);
 204
 205
 206/**
 207 * pcmcia_unregister_socket - remove a pcmcia socket device
 208 * @socket: the &socket to unregister
 209 */
 210void pcmcia_unregister_socket(struct pcmcia_socket *socket)
 211{
 212        if (!socket)
 213                return;
 214
 215        dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
 216
 217        if (socket->thread)
 218                kthread_stop(socket->thread);
 219
 220        /* remove from our own list */
 221        down_write(&pcmcia_socket_list_rwsem);
 222        list_del(&socket->socket_list);
 223        up_write(&pcmcia_socket_list_rwsem);
 224
 225        /* wait for sysfs to drop all references */
 226        if (socket->resource_ops->exit) {
 227                mutex_lock(&socket->ops_mutex);
 228                socket->resource_ops->exit(socket);
 229                mutex_unlock(&socket->ops_mutex);
 230        }
 231        wait_for_completion(&socket->socket_released);
 232} /* pcmcia_unregister_socket */
 233EXPORT_SYMBOL(pcmcia_unregister_socket);
 234
 235
 236struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr)
 237{
 238        struct pcmcia_socket *s;
 239
 240        down_read(&pcmcia_socket_list_rwsem);
 241        list_for_each_entry(s, &pcmcia_socket_list, socket_list)
 242                if (s->sock == nr) {
 243                        up_read(&pcmcia_socket_list_rwsem);
 244                        return s;
 245                }
 246        up_read(&pcmcia_socket_list_rwsem);
 247
 248        return NULL;
 249
 250}
 251EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
 252
 253static int socket_reset(struct pcmcia_socket *skt)
 254{
 255        int status, i;
 256
 257        dev_dbg(&skt->dev, "reset\n");
 258
 259        skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
 260        skt->ops->set_socket(skt, &skt->socket);
 261        udelay((long)reset_time);
 262
 263        skt->socket.flags &= ~SS_RESET;
 264        skt->ops->set_socket(skt, &skt->socket);
 265
 266        msleep(unreset_delay * 10);
 267        for (i = 0; i < unreset_limit; i++) {
 268                skt->ops->get_status(skt, &status);
 269
 270                if (!(status & SS_DETECT))
 271                        return -ENODEV;
 272
 273                if (status & SS_READY)
 274                        return 0;
 275
 276                msleep(unreset_check * 10);
 277        }
 278
 279        dev_printk(KERN_ERR, &skt->dev, "time out after reset.\n");
 280        return -ETIMEDOUT;
 281}
 282
 283/*
 284 * socket_setup() and socket_shutdown() are called by the main event handler
 285 * when card insertion and removal events are received.
 286 * socket_setup() turns on socket power and resets the socket, in two stages.
 287 * socket_shutdown() unconfigures a socket and turns off socket power.
 288 */
 289static void socket_shutdown(struct pcmcia_socket *s)
 290{
 291        int status;
 292
 293        dev_dbg(&s->dev, "shutdown\n");
 294
 295        if (s->callback)
 296                s->callback->remove(s);
 297
 298        mutex_lock(&s->ops_mutex);
 299        s->state &= SOCKET_INUSE | SOCKET_PRESENT;
 300        msleep(shutdown_delay * 10);
 301        s->state &= SOCKET_INUSE;
 302
 303        /* Blank out the socket state */
 304        s->socket = dead_socket;
 305        s->ops->init(s);
 306        s->ops->set_socket(s, &s->socket);
 307        s->lock_count = 0;
 308        kfree(s->fake_cis);
 309        s->fake_cis = NULL;
 310        s->functions = 0;
 311
 312        /* From here on we can be sure that only we (that is, the
 313         * pccardd thread) accesses this socket, and all (16-bit)
 314         * PCMCIA interactions are gone. Therefore, release
 315         * ops_mutex so that we don't get a sysfs-related lockdep
 316         * warning.
 317         */
 318        mutex_unlock(&s->ops_mutex);
 319
 320#ifdef CONFIG_CARDBUS
 321        cb_free(s);
 322#endif
 323
 324        /* give socket some time to power down */
 325        msleep(100);
 326
 327        s->ops->get_status(s, &status);
 328        if (status & SS_POWERON) {
 329                dev_printk(KERN_ERR, &s->dev,
 330                           "*** DANGER *** unable to remove socket power\n");
 331        }
 332
 333        s->state &= ~SOCKET_INUSE;
 334}
 335
 336static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
 337{
 338        int status, i;
 339
 340        dev_dbg(&skt->dev, "setup\n");
 341
 342        skt->ops->get_status(skt, &status);
 343        if (!(status & SS_DETECT))
 344                return -ENODEV;
 345
 346        msleep(initial_delay * 10);
 347
 348        for (i = 0; i < 100; i++) {
 349                skt->ops->get_status(skt, &status);
 350                if (!(status & SS_DETECT))
 351                        return -ENODEV;
 352
 353                if (!(status & SS_PENDING))
 354                        break;
 355
 356                msleep(100);
 357        }
 358
 359        if (status & SS_PENDING) {
 360                dev_printk(KERN_ERR, &skt->dev,
 361                           "voltage interrogation timed out.\n");
 362                return -ETIMEDOUT;
 363        }
 364
 365        if (status & SS_CARDBUS) {
 366                if (!(skt->features & SS_CAP_CARDBUS)) {
 367                        dev_printk(KERN_ERR, &skt->dev,
 368                                "cardbus cards are not supported.\n");
 369                        return -EINVAL;
 370                }
 371                skt->state |= SOCKET_CARDBUS;
 372        } else
 373                skt->state &= ~SOCKET_CARDBUS;
 374
 375        /*
 376         * Decode the card voltage requirements, and apply power to the card.
 377         */
 378        if (status & SS_3VCARD)
 379                skt->socket.Vcc = skt->socket.Vpp = 33;
 380        else if (!(status & SS_XVCARD))
 381                skt->socket.Vcc = skt->socket.Vpp = 50;
 382        else {
 383                dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n");
 384                return -EIO;
 385        }
 386
 387        if (skt->power_hook)
 388                skt->power_hook(skt, HOOK_POWER_PRE);
 389
 390        skt->socket.flags = 0;
 391        skt->ops->set_socket(skt, &skt->socket);
 392
 393        /*
 394         * Wait "vcc_settle" for the supply to stabilise.
 395         */
 396        msleep(vcc_settle * 10);
 397
 398        skt->ops->get_status(skt, &status);
 399        if (!(status & SS_POWERON)) {
 400                dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n");
 401                return -EIO;
 402        }
 403
 404        status = socket_reset(skt);
 405
 406        if (skt->power_hook)
 407                skt->power_hook(skt, HOOK_POWER_POST);
 408
 409        return status;
 410}
 411
 412/*
 413 * Handle card insertion.  Setup the socket, reset the card,
 414 * and then tell the rest of PCMCIA that a card is present.
 415 */
 416static int socket_insert(struct pcmcia_socket *skt)
 417{
 418        int ret;
 419
 420        dev_dbg(&skt->dev, "insert\n");
 421
 422        mutex_lock(&skt->ops_mutex);
 423        if (skt->state & SOCKET_INUSE) {
 424                mutex_unlock(&skt->ops_mutex);
 425                return -EINVAL;
 426        }
 427        skt->state |= SOCKET_INUSE;
 428
 429        ret = socket_setup(skt, setup_delay);
 430        if (ret == 0) {
 431                skt->state |= SOCKET_PRESENT;
 432
 433                dev_printk(KERN_NOTICE, &skt->dev,
 434                           "pccard: %s card inserted into slot %d\n",
 435                           (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
 436                           skt->sock);
 437
 438#ifdef CONFIG_CARDBUS
 439                if (skt->state & SOCKET_CARDBUS) {
 440                        cb_alloc(skt);
 441                        skt->state |= SOCKET_CARDBUS_CONFIG;
 442                }
 443#endif
 444                dev_dbg(&skt->dev, "insert done\n");
 445                mutex_unlock(&skt->ops_mutex);
 446
 447                if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
 448                        skt->callback->add(skt);
 449        } else {
 450                mutex_unlock(&skt->ops_mutex);
 451                socket_shutdown(skt);
 452        }
 453
 454        return ret;
 455}
 456
 457static int socket_suspend(struct pcmcia_socket *skt)
 458{
 459        if (skt->state & SOCKET_SUSPEND)
 460                return -EBUSY;
 461
 462        mutex_lock(&skt->ops_mutex);
 463        skt->suspended_state = skt->state;
 464
 465        skt->socket = dead_socket;
 466        skt->ops->set_socket(skt, &skt->socket);
 467        if (skt->ops->suspend)
 468                skt->ops->suspend(skt);
 469        skt->state |= SOCKET_SUSPEND;
 470        mutex_unlock(&skt->ops_mutex);
 471        return 0;
 472}
 473
 474static int socket_early_resume(struct pcmcia_socket *skt)
 475{
 476        mutex_lock(&skt->ops_mutex);
 477        skt->socket = dead_socket;
 478        skt->ops->init(skt);
 479        skt->ops->set_socket(skt, &skt->socket);
 480        if (skt->state & SOCKET_PRESENT)
 481                skt->resume_status = socket_setup(skt, resume_delay);
 482        mutex_unlock(&skt->ops_mutex);
 483        return 0;
 484}
 485
 486static int socket_late_resume(struct pcmcia_socket *skt)
 487{
 488        int ret;
 489
 490        mutex_lock(&skt->ops_mutex);
 491        skt->state &= ~SOCKET_SUSPEND;
 492        mutex_unlock(&skt->ops_mutex);
 493
 494        if (!(skt->state & SOCKET_PRESENT)) {
 495                ret = socket_insert(skt);
 496                if (ret == -ENODEV)
 497                        ret = 0;
 498                return ret;
 499        }
 500
 501        if (skt->resume_status) {
 502                socket_shutdown(skt);
 503                return 0;
 504        }
 505
 506        if (skt->suspended_state != skt->state) {
 507                dev_dbg(&skt->dev,
 508                        "suspend state 0x%x != resume state 0x%x\n",
 509                        skt->suspended_state, skt->state);
 510
 511                socket_shutdown(skt);
 512                return socket_insert(skt);
 513        }
 514
 515#ifdef CONFIG_CARDBUS
 516        if (skt->state & SOCKET_CARDBUS) {
 517                /* We can't be sure the CardBus card is the same
 518                 * as the one previously inserted. Therefore, remove
 519                 * and re-add... */
 520                cb_free(skt);
 521                cb_alloc(skt);
 522                return 0;
 523        }
 524#endif
 525        if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
 526                skt->callback->early_resume(skt);
 527        return 0;
 528}
 529
 530/*
 531 * Resume a socket.  If a card is present, verify its CIS against
 532 * our cached copy.  If they are different, the card has been
 533 * replaced, and we need to tell the drivers.
 534 */
 535static int socket_resume(struct pcmcia_socket *skt)
 536{
 537        if (!(skt->state & SOCKET_SUSPEND))
 538                return -EBUSY;
 539
 540        socket_early_resume(skt);
 541        return socket_late_resume(skt);
 542}
 543
 544static void socket_remove(struct pcmcia_socket *skt)
 545{
 546        dev_printk(KERN_NOTICE, &skt->dev,
 547                   "pccard: card ejected from slot %d\n", skt->sock);
 548        socket_shutdown(skt);
 549}
 550
 551/*
 552 * Process a socket card detect status change.
 553 *
 554 * If we don't have a card already present, delay the detect event for
 555 * about 20ms (to be on the safe side) before reading the socket status.
 556 *
 557 * Some i82365-based systems send multiple SS_DETECT events during card
 558 * insertion, and the "card present" status bit seems to bounce.  This
 559 * will probably be true with GPIO-based card detection systems after
 560 * the product has aged.
 561 */
 562static void socket_detect_change(struct pcmcia_socket *skt)
 563{
 564        if (!(skt->state & SOCKET_SUSPEND)) {
 565                int status;
 566
 567                if (!(skt->state & SOCKET_PRESENT))
 568                        msleep(20);
 569
 570                skt->ops->get_status(skt, &status);
 571                if ((skt->state & SOCKET_PRESENT) &&
 572                     !(status & SS_DETECT))
 573                        socket_remove(skt);
 574                if (!(skt->state & SOCKET_PRESENT) &&
 575                    (status & SS_DETECT))
 576                        socket_insert(skt);
 577        }
 578}
 579
 580static int pccardd(void *__skt)
 581{
 582        struct pcmcia_socket *skt = __skt;
 583        int ret;
 584
 585        skt->thread = current;
 586        skt->socket = dead_socket;
 587        skt->ops->init(skt);
 588        skt->ops->set_socket(skt, &skt->socket);
 589
 590        /* register with the device core */
 591        ret = device_register(&skt->dev);
 592        if (ret) {
 593                dev_printk(KERN_WARNING, &skt->dev,
 594                           "PCMCIA: unable to register socket\n");
 595                skt->thread = NULL;
 596                complete(&skt->thread_done);
 597                return 0;
 598        }
 599        ret = pccard_sysfs_add_socket(&skt->dev);
 600        if (ret)
 601                dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
 602
 603        complete(&skt->thread_done);
 604
 605        /* wait for userspace to catch up */
 606        msleep(250);
 607
 608        set_freezable();
 609        for (;;) {
 610                unsigned long flags;
 611                unsigned int events;
 612                unsigned int sysfs_events;
 613
 614                set_current_state(TASK_INTERRUPTIBLE);
 615
 616                spin_lock_irqsave(&skt->thread_lock, flags);
 617                events = skt->thread_events;
 618                skt->thread_events = 0;
 619                sysfs_events = skt->sysfs_events;
 620                skt->sysfs_events = 0;
 621                spin_unlock_irqrestore(&skt->thread_lock, flags);
 622
 623                mutex_lock(&skt->skt_mutex);
 624                if (events & SS_DETECT)
 625                        socket_detect_change(skt);
 626
 627                if (sysfs_events) {
 628                        if (sysfs_events & PCMCIA_UEVENT_EJECT)
 629                                socket_remove(skt);
 630                        if (sysfs_events & PCMCIA_UEVENT_INSERT)
 631                                socket_insert(skt);
 632                        if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) &&
 633                                !(skt->state & SOCKET_CARDBUS)) {
 634                                if (skt->callback)
 635                                        ret = skt->callback->suspend(skt);
 636                                else
 637                                        ret = 0;
 638                                if (!ret) {
 639                                        socket_suspend(skt);
 640                                        msleep(100);
 641                                }
 642                        }
 643                        if ((sysfs_events & PCMCIA_UEVENT_RESUME) &&
 644                                !(skt->state & SOCKET_CARDBUS)) {
 645                                ret = socket_resume(skt);
 646                                if (!ret && skt->callback)
 647                                        skt->callback->resume(skt);
 648                        }
 649                        if ((sysfs_events & PCMCIA_UEVENT_REQUERY) &&
 650                                !(skt->state & SOCKET_CARDBUS)) {
 651                                if (!ret && skt->callback)
 652                                        skt->callback->requery(skt);
 653                        }
 654                }
 655                mutex_unlock(&skt->skt_mutex);
 656
 657                if (events || sysfs_events)
 658                        continue;
 659
 660                if (kthread_should_stop())
 661                        break;
 662
 663                schedule();
 664                try_to_freeze();
 665        }
 666        /* make sure we are running before we exit */
 667        set_current_state(TASK_RUNNING);
 668
 669        /* shut down socket, if a device is still present */
 670        if (skt->state & SOCKET_PRESENT) {
 671                mutex_lock(&skt->skt_mutex);
 672                socket_remove(skt);
 673                mutex_unlock(&skt->skt_mutex);
 674        }
 675
 676        /* remove from the device core */
 677        pccard_sysfs_remove_socket(&skt->dev);
 678        device_unregister(&skt->dev);
 679
 680        return 0;
 681}
 682
 683/*
 684 * Yenta (at least) probes interrupts before registering the socket and
 685 * starting the handler thread.
 686 */
 687void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
 688{
 689        unsigned long flags;
 690        dev_dbg(&s->dev, "parse_events: events %08x\n", events);
 691        if (s->thread) {
 692                spin_lock_irqsave(&s->thread_lock, flags);
 693                s->thread_events |= events;
 694                spin_unlock_irqrestore(&s->thread_lock, flags);
 695
 696                wake_up_process(s->thread);
 697        }
 698} /* pcmcia_parse_events */
 699EXPORT_SYMBOL(pcmcia_parse_events);
 700
 701/**
 702 * pcmcia_parse_uevents() - tell pccardd to issue manual commands
 703 * @s:          the PCMCIA socket we wan't to command
 704 * @events:     events to pass to pccardd
 705 *
 706 * userspace-issued insert, eject, suspend and resume commands must be
 707 * handled by pccardd to avoid any sysfs-related deadlocks. Valid events
 708 * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert),
 709 * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend)
 710 * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card).
 711 */
 712void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events)
 713{
 714        unsigned long flags;
 715        dev_dbg(&s->dev, "parse_uevents: events %08x\n", events);
 716        if (s->thread) {
 717                spin_lock_irqsave(&s->thread_lock, flags);
 718                s->sysfs_events |= events;
 719                spin_unlock_irqrestore(&s->thread_lock, flags);
 720
 721                wake_up_process(s->thread);
 722        }
 723}
 724EXPORT_SYMBOL(pcmcia_parse_uevents);
 725
 726
 727/* register pcmcia_callback */
 728int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
 729{
 730        int ret = 0;
 731
 732        /* s->skt_mutex also protects s->callback */
 733        mutex_lock(&s->skt_mutex);
 734
 735        if (c) {
 736                /* registration */
 737                if (s->callback) {
 738                        ret = -EBUSY;
 739                        goto err;
 740                }
 741
 742                s->callback = c;
 743
 744                if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
 745                        s->callback->add(s);
 746        } else
 747                s->callback = NULL;
 748 err:
 749        mutex_unlock(&s->skt_mutex);
 750
 751        return ret;
 752}
 753EXPORT_SYMBOL(pccard_register_pcmcia);
 754
 755
 756/* I'm not sure which "reset" function this is supposed to use,
 757 * but for now, it uses the low-level interface's reset, not the
 758 * CIS register.
 759 */
 760
 761int pcmcia_reset_card(struct pcmcia_socket *skt)
 762{
 763        int ret;
 764
 765        dev_dbg(&skt->dev, "resetting socket\n");
 766
 767        mutex_lock(&skt->skt_mutex);
 768        do {
 769                if (!(skt->state & SOCKET_PRESENT)) {
 770                        dev_dbg(&skt->dev, "can't reset, not present\n");
 771                        ret = -ENODEV;
 772                        break;
 773                }
 774                if (skt->state & SOCKET_SUSPEND) {
 775                        dev_dbg(&skt->dev, "can't reset, suspended\n");
 776                        ret = -EBUSY;
 777                        break;
 778                }
 779                if (skt->state & SOCKET_CARDBUS) {
 780                        dev_dbg(&skt->dev, "can't reset, is cardbus\n");
 781                        ret = -EPERM;
 782                        break;
 783                }
 784
 785                if (skt->callback)
 786                        skt->callback->suspend(skt);
 787                mutex_lock(&skt->ops_mutex);
 788                ret = socket_reset(skt);
 789                mutex_unlock(&skt->ops_mutex);
 790                if ((ret == 0) && (skt->callback))
 791                        skt->callback->resume(skt);
 792
 793                ret = 0;
 794        } while (0);
 795        mutex_unlock(&skt->skt_mutex);
 796
 797        return ret;
 798} /* reset_card */
 799EXPORT_SYMBOL(pcmcia_reset_card);
 800
 801
 802static int pcmcia_socket_uevent(struct device *dev,
 803                                struct kobj_uevent_env *env)
 804{
 805        struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 806
 807        if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
 808                return -ENOMEM;
 809
 810        return 0;
 811}
 812
 813
 814static struct completion pcmcia_unload;
 815
 816static void pcmcia_release_socket_class(struct class *data)
 817{
 818        complete(&pcmcia_unload);
 819}
 820
 821
 822#ifdef CONFIG_PM
 823
 824static int __pcmcia_pm_op(struct device *dev,
 825                          int (*callback) (struct pcmcia_socket *skt))
 826{
 827        struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 828        int ret;
 829
 830        mutex_lock(&s->skt_mutex);
 831        ret = callback(s);
 832        mutex_unlock(&s->skt_mutex);
 833
 834        return ret;
 835}
 836
 837static int pcmcia_socket_dev_suspend_noirq(struct device *dev)
 838{
 839        return __pcmcia_pm_op(dev, socket_suspend);
 840}
 841
 842static int pcmcia_socket_dev_resume_noirq(struct device *dev)
 843{
 844        return __pcmcia_pm_op(dev, socket_early_resume);
 845}
 846
 847static int __used pcmcia_socket_dev_resume(struct device *dev)
 848{
 849        return __pcmcia_pm_op(dev, socket_late_resume);
 850}
 851
 852static const struct dev_pm_ops pcmcia_socket_pm_ops = {
 853        /* dev_resume may be called with IRQs enabled */
 854        SET_SYSTEM_SLEEP_PM_OPS(NULL,
 855                                pcmcia_socket_dev_resume)
 856
 857        /* late suspend must be called with IRQs disabled */
 858        .suspend_noirq = pcmcia_socket_dev_suspend_noirq,
 859        .freeze_noirq = pcmcia_socket_dev_suspend_noirq,
 860        .poweroff_noirq = pcmcia_socket_dev_suspend_noirq,
 861
 862        /* early resume must be called with IRQs disabled */
 863        .resume_noirq = pcmcia_socket_dev_resume_noirq,
 864        .thaw_noirq = pcmcia_socket_dev_resume_noirq,
 865        .restore_noirq = pcmcia_socket_dev_resume_noirq,
 866};
 867
 868#define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops)
 869
 870#else /* CONFIG_PM */
 871
 872#define PCMCIA_SOCKET_CLASS_PM_OPS NULL
 873
 874#endif /* CONFIG_PM */
 875
 876struct class pcmcia_socket_class = {
 877        .name = "pcmcia_socket",
 878        .dev_uevent = pcmcia_socket_uevent,
 879        .dev_release = pcmcia_release_socket,
 880        .class_release = pcmcia_release_socket_class,
 881        .pm = PCMCIA_SOCKET_CLASS_PM_OPS,
 882};
 883EXPORT_SYMBOL(pcmcia_socket_class);
 884
 885
 886static int __init init_pcmcia_cs(void)
 887{
 888        init_completion(&pcmcia_unload);
 889        return class_register(&pcmcia_socket_class);
 890}
 891
 892static void __exit exit_pcmcia_cs(void)
 893{
 894        class_unregister(&pcmcia_socket_class);
 895        wait_for_completion(&pcmcia_unload);
 896}
 897
 898subsys_initcall(init_pcmcia_cs);
 899module_exit(exit_pcmcia_cs);
 900
 901