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         return dev_get_drvdata(dev);
 144 }
 145 EXPORT_SYMBOL(pcmcia_get_socket);
 146
 147
 148 void pcmcia_put_socket(struct pcmcia_socket *skt)
 149 {
 150         put_device(&skt->dev);
 151 }
 152 EXPORT_SYMBOL(pcmcia_put_socket);
 153
 154
 155 static void pcmcia_release_socket(struct device *dev)
 156 {
 157         struct pcmcia_socket *socket = dev_get_drvdata(dev);
 158
 159         complete(&socket->socket_released);
 160 }
 161
 162 static int pccardd(void *__skt);
 163
 164 /**
 165  * pcmcia_register_socket - add a new pcmcia socket device
 166  * @socket: the &socket to register
 167  */
 168 int pcmcia_register_socket(struct pcmcia_socket *socket)
 169 {
 170         struct task_struct *tsk;
 171         int ret;
 172
 173         if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
 174                 return -EINVAL;
 175
 176         dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);
 177
 178         /* try to obtain a socket number [yes, it gets ugly if we
 179          * register more than 2^sizeof(unsigned int) pcmcia
 180          * sockets... but the socket number is deprecated
 181          * anyways, so I don't care] */
 182         down_write(&pcmcia_socket_list_rwsem);
 183         if (list_empty(&pcmcia_socket_list))
 184                 socket->sock = 0;
 185         else {
 186                 unsigned int found, i = 1;
 187                 struct pcmcia_socket *tmp;
 188                 do {
 189                         found = 1;
 190                         list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
 191                                 if (tmp->sock == i)
 192                                         found = 0;
 193                         }
 194                         i++;
 195                 } while (!found);
 196                 socket->sock = i - 1;
 197         }
 198         list_add_tail(&socket->socket_list, &pcmcia_socket_list);
 199         up_write(&pcmcia_socket_list_rwsem);
 200
 201 #ifndef CONFIG_CARDBUS
 202         /*
 203          * If we do not support Cardbus, ensure that
 204          * the Cardbus socket capability is disabled.
 205          */
 206         socket->features &= ~SS_CAP_CARDBUS;
 207 #endif
 208
 209         /* set proper values in socket->dev */
 210         dev_set_drvdata(&socket->dev, socket);
 211         socket->dev.class = &pcmcia_socket_class;
 212         dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock);
 213
 214         /* base address = 0, map = 0 */
 215         socket->cis_mem.flags = 0;
 216         socket->cis_mem.speed = cis_speed;
 217
 218         INIT_LIST_HEAD(&socket->cis_cache);
 219
 220         init_completion(&socket->socket_released);
 221         init_completion(&socket->thread_done);
 222         mutex_init(&socket->skt_mutex);
 223         mutex_init(&socket->ops_mutex);
 224         spin_lock_init(&socket->thread_lock);
 225
 226         if (socket->resource_ops->init) {
 227                 mutex_lock(&socket->ops_mutex);
 228                 ret = socket->resource_ops->init(socket);
 229                 mutex_unlock(&socket->ops_mutex);
 230                 if (ret)
 231                         goto err;
 232         }
 233
 234         tsk = kthread_run(pccardd, socket, "pccardd");
 235         if (IS_ERR(tsk)) {
 236                 ret = PTR_ERR(tsk);
 237                 goto err;
 238         }
 239
 240         wait_for_completion(&socket->thread_done);
 241         if (!socket->thread) {
 242                 dev_printk(KERN_WARNING, &socket->dev,
 243                            "PCMCIA: warning: socket thread did not start\n");
 244                 return -EIO;
 245         }
 246
 247         pcmcia_parse_events(socket, SS_DETECT);
 248
 249         /*
 250          * Let's try to get the PCMCIA module for 16-bit PCMCIA support.
 251          * If it fails, it doesn't matter -- we still have 32-bit CardBus
 252          * support to offer, so this is not a failure mode.
 253          */
 254         request_module_nowait("pcmcia");
 255
 256         return 0;
 257
 258  err:
 259         down_write(&pcmcia_socket_list_rwsem);
 260         list_del(&socket->socket_list);
 261         up_write(&pcmcia_socket_list_rwsem);
 262         return ret;
 263 } /* pcmcia_register_socket */
 264 EXPORT_SYMBOL(pcmcia_register_socket);
 265
 266
 267 /**
 268  * pcmcia_unregister_socket - remove a pcmcia socket device
 269  * @socket: the &socket to unregister
 270  */
 271 void pcmcia_unregister_socket(struct pcmcia_socket *socket)
 272 {
 273         if (!socket)
 274                 return;
 275
 276         dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
 277
 278         if (socket->thread)
 279                 kthread_stop(socket->thread);
 280
 281         /* remove from our own list */
 282         down_write(&pcmcia_socket_list_rwsem);
 283         list_del(&socket->socket_list);
 284         up_write(&pcmcia_socket_list_rwsem);
 285
 286         /* wait for sysfs to drop all references */
 287         if (socket->resource_ops->exit) {
 288                 mutex_lock(&socket->ops_mutex);
 289                 socket->resource_ops->exit(socket);
 290                 mutex_unlock(&socket->ops_mutex);
 291         }
 292         wait_for_completion(&socket->socket_released);
 293 } /* pcmcia_unregister_socket */
 294 EXPORT_SYMBOL(pcmcia_unregister_socket);
 295
 296
 297 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr)
 298 {
 299         struct pcmcia_socket *s;
 300
 301         down_read(&pcmcia_socket_list_rwsem);
 302         list_for_each_entry(s, &pcmcia_socket_list, socket_list)
 303                 if (s->sock == nr) {
 304                         up_read(&pcmcia_socket_list_rwsem);
 305                         return s;
 306                 }
 307         up_read(&pcmcia_socket_list_rwsem);
 308
 309         return NULL;
 310
 311 }
 312 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
 313
 314 /*
 315  * The central event handler.  Send_event() sends an event to the
 316  * 16-bit subsystem, which then calls the relevant device drivers.
 317  * Parse_events() interprets the event bits from
 318  * a card status change report.  Do_shutdown() handles the high
 319  * priority stuff associated with a card removal.
 320  */
 321
 322 /* NOTE: send_event needs to be called with skt->sem held. */
 323
 324 static int send_event(struct pcmcia_socket *s, event_t event, int priority)
 325 {
 326         int ret;
 327
 328         if ((s->state & SOCKET_CARDBUS) && (event != CS_EVENT_CARD_REMOVAL))
 329                 return 0;
 330
 331         dev_dbg(&s->dev, "send_event(event %d, pri %d, callback 0x%p)\n",
 332            event, priority, s->callback);
 333
 334         if (!s->callback)
 335                 return 0;
 336         if (!try_module_get(s->callback->owner))
 337                 return 0;
 338
 339         ret = s->callback->event(s, event, priority);
 340
 341         module_put(s->callback->owner);
 342
 343         return ret;
 344 }
 345
 346 static int socket_reset(struct pcmcia_socket *skt)
 347 {
 348         int status, i;
 349
 350         dev_dbg(&skt->dev, "reset\n");
 351
 352         skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
 353         skt->ops->set_socket(skt, &skt->socket);
 354         udelay((long)reset_time);
 355
 356         skt->socket.flags &= ~SS_RESET;
 357         skt->ops->set_socket(skt, &skt->socket);
 358
 359         msleep(unreset_delay * 10);
 360         for (i = 0; i < unreset_limit; i++) {
 361                 skt->ops->get_status(skt, &status);
 362
 363                 if (!(status & SS_DETECT))
 364                         return -ENODEV;
 365
 366                 if (status & SS_READY)
 367                         return 0;
 368
 369                 msleep(unreset_check * 10);
 370         }
 371
 372         dev_printk(KERN_ERR, &skt->dev, "time out after reset.\n");
 373         return -ETIMEDOUT;
 374 }
 375
 376 /*
 377  * socket_setup() and socket_shutdown() are called by the main event handler
 378  * when card insertion and removal events are received.
 379  * socket_setup() turns on socket power and resets the socket, in two stages.
 380  * socket_shutdown() unconfigures a socket and turns off socket power.
 381  */
 382 static void socket_shutdown(struct pcmcia_socket *s)
 383 {
 384         int status;
 385
 386         dev_dbg(&s->dev, "shutdown\n");
 387
 388         send_event(s, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
 389
 390         mutex_lock(&s->ops_mutex);
 391         s->state &= SOCKET_INUSE | SOCKET_PRESENT;
 392         msleep(shutdown_delay * 10);
 393         s->state &= SOCKET_INUSE;
 394
 395         /* Blank out the socket state */
 396         s->socket = dead_socket;
 397         s->ops->init(s);
 398         s->ops->set_socket(s, &s->socket);
 399         s->irq.AssignedIRQ = s->irq.Config = 0;
 400         s->lock_count = 0;
 401         kfree(s->fake_cis);
 402         s->fake_cis = NULL;
 403         s->functions = 0;
 404
 405         /* From here on we can be sure that only we (that is, the
 406          * pccardd thread) accesses this socket, and all (16-bit)
 407          * PCMCIA interactions are gone. Therefore, release
 408          * ops_mutex so that we don't get a sysfs-related lockdep
 409          * warning.
 410          */
 411         mutex_unlock(&s->ops_mutex);
 412
 413 #ifdef CONFIG_CARDBUS
 414         cb_free(s);
 415 #endif
 416
 417         /* give socket some time to power down */
 418         msleep(100);
 419
 420         s->ops->get_status(s, &status);
 421         if (status & SS_POWERON) {
 422                 dev_printk(KERN_ERR, &s->dev,
 423                            "*** DANGER *** unable to remove socket power\n");
 424         }
 425
 426         s->state &= ~SOCKET_INUSE;
 427 }
 428
 429 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
 430 {
 431         int status, i;
 432
 433         dev_dbg(&skt->dev, "setup\n");
 434
 435         skt->ops->get_status(skt, &status);
 436         if (!(status & SS_DETECT))
 437                 return -ENODEV;
 438
 439         msleep(initial_delay * 10);
 440
 441         for (i = 0; i < 100; i++) {
 442                 skt->ops->get_status(skt, &status);
 443                 if (!(status & SS_DETECT))
 444                         return -ENODEV;
 445
 446                 if (!(status & SS_PENDING))
 447                         break;
 448
 449                 msleep(100);
 450         }
 451
 452         if (status & SS_PENDING) {
 453                 dev_printk(KERN_ERR, &skt->dev,
 454                            "voltage interrogation timed out.\n");
 455                 return -ETIMEDOUT;
 456         }
 457
 458         if (status & SS_CARDBUS) {
 459                 if (!(skt->features & SS_CAP_CARDBUS)) {
 460                         dev_printk(KERN_ERR, &skt->dev,
 461                                 "cardbus cards are not supported.\n");
 462                         return -EINVAL;
 463                 }
 464                 skt->state |= SOCKET_CARDBUS;
 465         } else
 466                 skt->state &= ~SOCKET_CARDBUS;
 467
 468         /*
 469          * Decode the card voltage requirements, and apply power to the card.
 470          */
 471         if (status & SS_3VCARD)
 472                 skt->socket.Vcc = skt->socket.Vpp = 33;
 473         else if (!(status & SS_XVCARD))
 474                 skt->socket.Vcc = skt->socket.Vpp = 50;
 475         else {
 476                 dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n");
 477                 return -EIO;
 478         }
 479
 480         if (skt->power_hook)
 481                 skt->power_hook(skt, HOOK_POWER_PRE);
 482
 483         skt->socket.flags = 0;
 484         skt->ops->set_socket(skt, &skt->socket);
 485
 486         /*
 487          * Wait "vcc_settle" for the supply to stabilise.
 488          */
 489         msleep(vcc_settle * 10);
 490
 491         skt->ops->get_status(skt, &status);
 492         if (!(status & SS_POWERON)) {
 493                 dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n");
 494                 return -EIO;
 495         }
 496
 497         status = socket_reset(skt);
 498
 499         if (skt->power_hook)
 500                 skt->power_hook(skt, HOOK_POWER_POST);
 501
 502         return status;
 503 }
 504
 505 /*
 506  * Handle card insertion.  Setup the socket, reset the card,
 507  * and then tell the rest of PCMCIA that a card is present.
 508  */
 509 static int socket_insert(struct pcmcia_socket *skt)
 510 {
 511         int ret;
 512
 513         dev_dbg(&skt->dev, "insert\n");
 514
 515         mutex_lock(&skt->ops_mutex);
 516         if (skt->state & SOCKET_INUSE) {
 517                 mutex_unlock(&skt->ops_mutex);
 518                 return -EINVAL;
 519         }
 520         skt->state |= SOCKET_INUSE;
 521
 522         ret = socket_setup(skt, setup_delay);
 523         if (ret == 0) {
 524                 skt->state |= SOCKET_PRESENT;
 525
 526                 dev_printk(KERN_NOTICE, &skt->dev,
 527                            "pccard: %s card inserted into slot %d\n",
 528                            (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
 529                            skt->sock);
 530
 531 #ifdef CONFIG_CARDBUS
 532                 if (skt->state & SOCKET_CARDBUS) {
 533                         cb_alloc(skt);
 534                         skt->state |= SOCKET_CARDBUS_CONFIG;
 535                 }
 536 #endif
 537                 dev_dbg(&skt->dev, "insert done\n");
 538                 mutex_unlock(&skt->ops_mutex);
 539
 540                 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 541         } else {
 542                 mutex_unlock(&skt->ops_mutex);
 543                 socket_shutdown(skt);
 544         }
 545
 546         return ret;
 547 }
 548
 549 static int socket_suspend(struct pcmcia_socket *skt)
 550 {
 551         if (skt->state & SOCKET_SUSPEND)
 552                 return -EBUSY;
 553
 554         mutex_lock(&skt->ops_mutex);
 555         skt->suspended_state = skt->state;
 556
 557         send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
 558         skt->socket = dead_socket;
 559         skt->ops->set_socket(skt, &skt->socket);
 560         if (skt->ops->suspend)
 561                 skt->ops->suspend(skt);
 562         skt->state |= SOCKET_SUSPEND;
 563         mutex_unlock(&skt->ops_mutex);
 564         return 0;
 565 }
 566
 567 static int socket_early_resume(struct pcmcia_socket *skt)
 568 {
 569         mutex_lock(&skt->ops_mutex);
 570         skt->socket = dead_socket;
 571         skt->ops->init(skt);
 572         skt->ops->set_socket(skt, &skt->socket);
 573         if (skt->state & SOCKET_PRESENT)
 574                 skt->resume_status = socket_setup(skt, resume_delay);
 575         mutex_unlock(&skt->ops_mutex);
 576         return 0;
 577 }
 578
 579 static int socket_late_resume(struct pcmcia_socket *skt)
 580 {
 581         mutex_lock(&skt->ops_mutex);
 582         skt->state &= ~SOCKET_SUSPEND;
 583         mutex_unlock(&skt->ops_mutex);
 584
 585         if (!(skt->state & SOCKET_PRESENT))
 586                 return socket_insert(skt);
 587
 588         if (skt->resume_status) {
 589                 socket_shutdown(skt);
 590                 return 0;
 591         }
 592
 593         if (skt->suspended_state != skt->state) {
 594                 dev_dbg(&skt->dev,
 595                         "suspend state 0x%x != resume state 0x%x\n",
 596                         skt->suspended_state, skt->state);
 597
 598                 socket_shutdown(skt);
 599                 return socket_insert(skt);
 600         }
 601
 602 #ifdef CONFIG_CARDBUS
 603         if (skt->state & SOCKET_CARDBUS) {
 604                 /* We can't be sure the CardBus card is the same
 605                  * as the one previously inserted. Therefore, remove
 606                  * and re-add... */
 607                 cb_free(skt);
 608                 cb_alloc(skt);
 609                 return 0;
 610         }
 611 #endif
 612
 613         send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
 614         return 0;
 615 }
 616
 617 /*
 618  * Resume a socket.  If a card is present, verify its CIS against
 619  * our cached copy.  If they are different, the card has been
 620  * replaced, and we need to tell the drivers.
 621  */
 622 static int socket_resume(struct pcmcia_socket *skt)
 623 {
 624         if (!(skt->state & SOCKET_SUSPEND))
 625                 return -EBUSY;
 626
 627         socket_early_resume(skt);
 628         return socket_late_resume(skt);
 629 }
 630
 631 static void socket_remove(struct pcmcia_socket *skt)
 632 {
 633         dev_printk(KERN_NOTICE, &skt->dev,
 634                    "pccard: card ejected from slot %d\n", skt->sock);
 635         socket_shutdown(skt);
 636 }
 637
 638 /*
 639  * Process a socket card detect status change.
 640  *
 641  * If we don't have a card already present, delay the detect event for
 642  * about 20ms (to be on the safe side) before reading the socket status.
 643  *
 644  * Some i82365-based systems send multiple SS_DETECT events during card
 645  * insertion, and the "card present" status bit seems to bounce.  This
 646  * will probably be true with GPIO-based card detection systems after
 647  * the product has aged.
 648  */
 649 static void socket_detect_change(struct pcmcia_socket *skt)
 650 {
 651         if (!(skt->state & SOCKET_SUSPEND)) {
 652                 int status;
 653
 654                 if (!(skt->state & SOCKET_PRESENT))
 655                         msleep(20);
 656
 657                 skt->ops->get_status(skt, &status);
 658                 if ((skt->state & SOCKET_PRESENT) &&
 659                      !(status & SS_DETECT))
 660                         socket_remove(skt);
 661                 if (!(skt->state & SOCKET_PRESENT) &&
 662                     (status & SS_DETECT))
 663                         socket_insert(skt);
 664         }
 665 }
 666
 667 static int pccardd(void *__skt)
 668 {
 669         struct pcmcia_socket *skt = __skt;
 670         int ret;
 671
 672         skt->thread = current;
 673         skt->socket = dead_socket;
 674         skt->ops->init(skt);
 675         skt->ops->set_socket(skt, &skt->socket);
 676
 677         /* register with the device core */
 678         ret = device_register(&skt->dev);
 679         if (ret) {
 680                 dev_printk(KERN_WARNING, &skt->dev,
 681                            "PCMCIA: unable to register socket\n");
 682                 skt->thread = NULL;
 683                 complete(&skt->thread_done);
 684                 return 0;
 685         }
 686         ret = pccard_sysfs_add_socket(&skt->dev);
 687         if (ret)
 688                 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
 689
 690         complete(&skt->thread_done);
 691
 692         /* wait for userspace to catch up */
 693         msleep(250);
 694
 695         set_freezable();
 696         for (;;) {
 697                 unsigned long flags;
 698                 unsigned int events;
 699                 unsigned int sysfs_events;
 700
 701                 set_current_state(TASK_INTERRUPTIBLE);
 702
 703                 spin_lock_irqsave(&skt->thread_lock, flags);
 704                 events = skt->thread_events;
 705                 skt->thread_events = 0;
 706                 sysfs_events = skt->sysfs_events;
 707                 skt->sysfs_events = 0;
 708                 spin_unlock_irqrestore(&skt->thread_lock, flags);
 709
 710                 mutex_lock(&skt->skt_mutex);
 711                 if (events) {
 712                         if (events & SS_DETECT)
 713                                 socket_detect_change(skt);
 714                         if (events & SS_BATDEAD)
 715                                 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
 716                         if (events & SS_BATWARN)
 717                                 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
 718                         if (events & SS_READY)
 719                                 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
 720                 }
 721
 722                 if (sysfs_events) {
 723                         if (sysfs_events & PCMCIA_UEVENT_EJECT)
 724                                 socket_remove(skt);
 725                         if (sysfs_events & PCMCIA_UEVENT_INSERT)
 726                                 socket_insert(skt);
 727                         if ((sysfs_events & PCMCIA_UEVENT_RESUME) &&
 728                                 !(skt->state & SOCKET_CARDBUS)) {
 729                                 ret = socket_resume(skt);
 730                                 if (!ret && skt->callback)
 731                                         skt->callback->resume(skt);
 732                         }
 733                         if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) &&
 734                                 !(skt->state & SOCKET_CARDBUS)) {
 735                                 if (skt->callback)
 736                                         ret = skt->callback->suspend(skt);
 737                                 else
 738                                         ret = 0;
 739                                 if (!ret)
 740                                         socket_suspend(skt);
 741                         }
 742                         if ((sysfs_events & PCMCIA_UEVENT_REQUERY) &&
 743                                 !(skt->state & SOCKET_CARDBUS)) {
 744                                 if (!ret && skt->callback)
 745                                         skt->callback->requery(skt);
 746                         }
 747                 }
 748                 mutex_unlock(&skt->skt_mutex);
 749
 750                 if (events || sysfs_events)
 751                         continue;
 752
 753                 if (kthread_should_stop())
 754                         break;
 755
 756                 schedule();
 757                 try_to_freeze();
 758         }
 759         /* make sure we are running before we exit */
 760         set_current_state(TASK_RUNNING);
 761
 762         /* shut down socket, if a device is still present */
 763         if (skt->state & SOCKET_PRESENT) {
 764                 mutex_lock(&skt->skt_mutex);
 765                 socket_remove(skt);
 766                 mutex_unlock(&skt->skt_mutex);
 767         }
 768
 769         /* remove from the device core */
 770         pccard_sysfs_remove_socket(&skt->dev);
 771         device_unregister(&skt->dev);
 772
 773         return 0;
 774 }
 775
 776 /*
 777  * Yenta (at least) probes interrupts before registering the socket and
 778  * starting the handler thread.
 779  */
 780 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
 781 {
 782         unsigned long flags;
 783         dev_dbg(&s->dev, "parse_events: events %08x\n", events);
 784         if (s->thread) {
 785                 spin_lock_irqsave(&s->thread_lock, flags);
 786                 s->thread_events |= events;
 787                 spin_unlock_irqrestore(&s->thread_lock, flags);
 788
 789                 wake_up_process(s->thread);
 790         }
 791 } /* pcmcia_parse_events */
 792 EXPORT_SYMBOL(pcmcia_parse_events);
 793
 794 /**
 795  * pcmcia_parse_uevents() - tell pccardd to issue manual commands
 796  * @s:          the PCMCIA socket we wan't to command
 797  * @events:     events to pass to pccardd
 798  *
 799  * userspace-issued insert, eject, suspend and resume commands must be
 800  * handled by pccardd to avoid any sysfs-related deadlocks. Valid events
 801  * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert),
 802  * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend)
 803  * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card).
 804  */
 805 void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events)
 806 {
 807         unsigned long flags;
 808         dev_dbg(&s->dev, "parse_uevents: events %08x\n", events);
 809         if (s->thread) {
 810                 spin_lock_irqsave(&s->thread_lock, flags);
 811                 s->sysfs_events |= events;
 812                 spin_unlock_irqrestore(&s->thread_lock, flags);
 813
 814                 wake_up_process(s->thread);
 815         }
 816 }
 817 EXPORT_SYMBOL(pcmcia_parse_uevents);
 818
 819
 820 /* register pcmcia_callback */
 821 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
 822 {
 823         int ret = 0;
 824
 825         /* s->skt_mutex also protects s->callback */
 826         mutex_lock(&s->skt_mutex);
 827
 828         if (c) {
 829                 /* registration */
 830                 if (s->callback) {
 831                         ret = -EBUSY;
 832                         goto err;
 833                 }
 834
 835                 s->callback = c;
 836
 837                 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
 838                         send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 839         } else
 840                 s->callback = NULL;
 841  err:
 842         mutex_unlock(&s->skt_mutex);
 843
 844         return ret;
 845 }
 846 EXPORT_SYMBOL(pccard_register_pcmcia);
 847
 848
 849 /* I'm not sure which "reset" function this is supposed to use,
 850  * but for now, it uses the low-level interface's reset, not the
 851  * CIS register.
 852  */
 853
 854 int pcmcia_reset_card(struct pcmcia_socket *skt)
 855 {
 856         int ret;
 857
 858         dev_dbg(&skt->dev, "resetting socket\n");
 859
 860         mutex_lock(&skt->skt_mutex);
 861         do {
 862                 if (!(skt->state & SOCKET_PRESENT)) {
 863                         dev_dbg(&skt->dev, "can't reset, not present\n");
 864                         ret = -ENODEV;
 865                         break;
 866                 }
 867                 if (skt->state & SOCKET_SUSPEND) {
 868                         dev_dbg(&skt->dev, "can't reset, suspended\n");
 869                         ret = -EBUSY;
 870                         break;
 871                 }
 872                 if (skt->state & SOCKET_CARDBUS) {
 873                         dev_dbg(&skt->dev, "can't reset, is cardbus\n");
 874                         ret = -EPERM;
 875                         break;
 876                 }
 877
 878                 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW);
 879                 if (ret == 0) {
 880                         send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
 881                         if (skt->callback)
 882                                 skt->callback->suspend(skt);
 883                         mutex_lock(&skt->ops_mutex);
 884                         ret = socket_reset(skt);
 885                         mutex_unlock(&skt->ops_mutex);
 886                         if (ret == 0) {
 887                                 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
 888                                 if (skt->callback)
 889                                         skt->callback->resume(skt);
 890                         }
 891                 }
 892
 893                 ret = 0;
 894         } while (0);
 895         mutex_unlock(&skt->skt_mutex);
 896
 897         return ret;
 898 } /* reset_card */
 899 EXPORT_SYMBOL(pcmcia_reset_card);
 900
 901
 902 static int pcmcia_socket_uevent(struct device *dev,
 903                                 struct kobj_uevent_env *env)
 904 {
 905         struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 906
 907         if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
 908                 return -ENOMEM;
 909
 910         return 0;
 911 }
 912
 913
 914 static struct completion pcmcia_unload;
 915
 916 static void pcmcia_release_socket_class(struct class *data)
 917 {
 918         complete(&pcmcia_unload);
 919 }
 920
 921
 922 struct class pcmcia_socket_class = {
 923         .name = "pcmcia_socket",
 924         .dev_uevent = pcmcia_socket_uevent,
 925         .dev_release = pcmcia_release_socket,
 926         .class_release = pcmcia_release_socket_class,
 927 };
 928 EXPORT_SYMBOL(pcmcia_socket_class);
 929
 930
 931 static int __init init_pcmcia_cs(void)
 932 {
 933         init_completion(&pcmcia_unload);
 934         return class_register(&pcmcia_socket_class);
 935 }
 936
 937 static void __exit exit_pcmcia_cs(void)
 938 {
 939         class_unregister(&pcmcia_socket_class);
 940         wait_for_completion(&pcmcia_unload);
 941 }
 942
 943 subsys_initcall(init_pcmcia_cs);
 944 module_exit(exit_pcmcia_cs);
 945