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         spin_lock_init(&socket->lock);
 179
 180         /* try to obtain a socket number [yes, it gets ugly if we
 181          * register more than 2^sizeof(unsigned int) pcmcia
 182          * sockets... but the socket number is deprecated
 183          * anyways, so I don't care] */
 184         down_write(&pcmcia_socket_list_rwsem);
 185         if (list_empty(&pcmcia_socket_list))
 186                 socket->sock = 0;
 187         else {
 188                 unsigned int found, i = 1;
 189                 struct pcmcia_socket *tmp;
 190                 do {
 191                         found = 1;
 192                         list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
 193                                 if (tmp->sock == i)
 194                                         found = 0;
 195                         }
 196                         i++;
 197                 } while (!found);
 198                 socket->sock = i - 1;
 199         }
 200         list_add_tail(&socket->socket_list, &pcmcia_socket_list);
 201         up_write(&pcmcia_socket_list_rwsem);
 202
 203 #ifndef CONFIG_CARDBUS
 204         /*
 205          * If we do not support Cardbus, ensure that
 206          * the Cardbus socket capability is disabled.
 207          */
 208         socket->features &= ~SS_CAP_CARDBUS;
 209 #endif
 210
 211         /* set proper values in socket->dev */
 212         dev_set_drvdata(&socket->dev, socket);
 213         socket->dev.class = &pcmcia_socket_class;
 214         dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock);
 215
 216         /* base address = 0, map = 0 */
 217         socket->cis_mem.flags = 0;
 218         socket->cis_mem.speed = cis_speed;
 219
 220         INIT_LIST_HEAD(&socket->cis_cache);
 221
 222         init_completion(&socket->socket_released);
 223         init_completion(&socket->thread_done);
 224         mutex_init(&socket->skt_mutex);
 225         spin_lock_init(&socket->thread_lock);
 226
 227         if (socket->resource_ops->init) {
 228                 ret = socket->resource_ops->init(socket);
 229                 if (ret)
 230                         goto err;
 231         }
 232
 233         tsk = kthread_run(pccardd, socket, "pccardd");
 234         if (IS_ERR(tsk)) {
 235                 ret = PTR_ERR(tsk);
 236                 goto err;
 237         }
 238
 239         wait_for_completion(&socket->thread_done);
 240         if (!socket->thread) {
 241                 dev_printk(KERN_WARNING, &socket->dev,
 242                            "PCMCIA: warning: socket thread did not start\n");
 243                 return -EIO;
 244         }
 245
 246         pcmcia_parse_events(socket, SS_DETECT);
 247
 248         /*
 249          * Let's try to get the PCMCIA module for 16-bit PCMCIA support.
 250          * If it fails, it doesn't matter -- we still have 32-bit CardBus
 251          * support to offer, so this is not a failure mode.
 252          */
 253         request_module_nowait("pcmcia");
 254
 255         return 0;
 256
 257  err:
 258         down_write(&pcmcia_socket_list_rwsem);
 259         list_del(&socket->socket_list);
 260         up_write(&pcmcia_socket_list_rwsem);
 261         return ret;
 262 } /* pcmcia_register_socket */
 263 EXPORT_SYMBOL(pcmcia_register_socket);
 264
 265
 266 /**
 267  * pcmcia_unregister_socket - remove a pcmcia socket device
 268  * @socket: the &socket to unregister
 269  */
 270 void pcmcia_unregister_socket(struct pcmcia_socket *socket)
 271 {
 272         if (!socket)
 273                 return;
 274
 275         dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
 276
 277         if (socket->thread)
 278                 kthread_stop(socket->thread);
 279
 280         /* remove from our own list */
 281         down_write(&pcmcia_socket_list_rwsem);
 282         list_del(&socket->socket_list);
 283         up_write(&pcmcia_socket_list_rwsem);
 284
 285         /* wait for sysfs to drop all references */
 286         if (socket->resource_ops->exit)
 287                 socket->resource_ops->exit(socket);
 288         wait_for_completion(&socket->socket_released);
 289 } /* pcmcia_unregister_socket */
 290 EXPORT_SYMBOL(pcmcia_unregister_socket);
 291
 292
 293 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr)
 294 {
 295         struct pcmcia_socket *s;
 296
 297         down_read(&pcmcia_socket_list_rwsem);
 298         list_for_each_entry(s, &pcmcia_socket_list, socket_list)
 299                 if (s->sock == nr) {
 300                         up_read(&pcmcia_socket_list_rwsem);
 301                         return s;
 302                 }
 303         up_read(&pcmcia_socket_list_rwsem);
 304
 305         return NULL;
 306
 307 }
 308 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
 309
 310 /*
 311  * The central event handler.  Send_event() sends an event to the
 312  * 16-bit subsystem, which then calls the relevant device drivers.
 313  * Parse_events() interprets the event bits from
 314  * a card status change report.  Do_shutdown() handles the high
 315  * priority stuff associated with a card removal.
 316  */
 317
 318 /* NOTE: send_event needs to be called with skt->sem held. */
 319
 320 static int send_event(struct pcmcia_socket *s, event_t event, int priority)
 321 {
 322         int ret;
 323
 324         if ((s->state & SOCKET_CARDBUS) && (event != CS_EVENT_CARD_REMOVAL))
 325                 return 0;
 326
 327         dev_dbg(&s->dev, "send_event(event %d, pri %d, callback 0x%p)\n",
 328            event, priority, s->callback);
 329
 330         if (!s->callback)
 331                 return 0;
 332         if (!try_module_get(s->callback->owner))
 333                 return 0;
 334
 335         ret = s->callback->event(s, event, priority);
 336
 337         module_put(s->callback->owner);
 338
 339         return ret;
 340 }
 341
 342 static int socket_reset(struct pcmcia_socket *skt)
 343 {
 344         int status, i;
 345
 346         dev_dbg(&skt->dev, "reset\n");
 347
 348         skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
 349         skt->ops->set_socket(skt, &skt->socket);
 350         udelay((long)reset_time);
 351
 352         skt->socket.flags &= ~SS_RESET;
 353         skt->ops->set_socket(skt, &skt->socket);
 354
 355         msleep(unreset_delay * 10);
 356         for (i = 0; i < unreset_limit; i++) {
 357                 skt->ops->get_status(skt, &status);
 358
 359                 if (!(status & SS_DETECT))
 360                         return -ENODEV;
 361
 362                 if (status & SS_READY)
 363                         return 0;
 364
 365                 msleep(unreset_check * 10);
 366         }
 367
 368         dev_printk(KERN_ERR, &skt->dev, "time out after reset.\n");
 369         return -ETIMEDOUT;
 370 }
 371
 372 /*
 373  * socket_setup() and socket_shutdown() are called by the main event handler
 374  * when card insertion and removal events are received.
 375  * socket_setup() turns on socket power and resets the socket, in two stages.
 376  * socket_shutdown() unconfigures a socket and turns off socket power.
 377  */
 378 static void socket_shutdown(struct pcmcia_socket *s)
 379 {
 380         int status;
 381
 382         dev_dbg(&s->dev, "shutdown\n");
 383
 384         send_event(s, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
 385         s->state &= SOCKET_INUSE | SOCKET_PRESENT;
 386         msleep(shutdown_delay * 10);
 387         s->state &= SOCKET_INUSE;
 388
 389         /* Blank out the socket state */
 390         s->socket = dead_socket;
 391         s->ops->init(s);
 392         s->ops->set_socket(s, &s->socket);
 393         s->irq.AssignedIRQ = s->irq.Config = 0;
 394         s->lock_count = 0;
 395         kfree(s->fake_cis);
 396         s->fake_cis = NULL;
 397 #ifdef CONFIG_CARDBUS
 398         cb_free(s);
 399 #endif
 400         s->functions = 0;
 401
 402         /* give socket some time to power down */
 403         msleep(100);
 404
 405         s->ops->get_status(s, &status);
 406         if (status & SS_POWERON) {
 407                 dev_printk(KERN_ERR, &s->dev,
 408                            "*** DANGER *** unable to remove socket power\n");
 409         }
 410
 411         s->state &= ~SOCKET_INUSE;
 412 }
 413
 414 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
 415 {
 416         int status, i;
 417
 418         dev_dbg(&skt->dev, "setup\n");
 419
 420         skt->ops->get_status(skt, &status);
 421         if (!(status & SS_DETECT))
 422                 return -ENODEV;
 423
 424         msleep(initial_delay * 10);
 425
 426         for (i = 0; i < 100; i++) {
 427                 skt->ops->get_status(skt, &status);
 428                 if (!(status & SS_DETECT))
 429                         return -ENODEV;
 430
 431                 if (!(status & SS_PENDING))
 432                         break;
 433
 434                 msleep(100);
 435         }
 436
 437         if (status & SS_PENDING) {
 438                 dev_printk(KERN_ERR, &skt->dev,
 439                            "voltage interrogation timed out.\n");
 440                 return -ETIMEDOUT;
 441         }
 442
 443         if (status & SS_CARDBUS) {
 444                 if (!(skt->features & SS_CAP_CARDBUS)) {
 445                         dev_printk(KERN_ERR, &skt->dev,
 446                                 "cardbus cards are not supported.\n");
 447                         return -EINVAL;
 448                 }
 449                 skt->state |= SOCKET_CARDBUS;
 450         } else
 451                 skt->state &= ~SOCKET_CARDBUS;
 452
 453         /*
 454          * Decode the card voltage requirements, and apply power to the card.
 455          */
 456         if (status & SS_3VCARD)
 457                 skt->socket.Vcc = skt->socket.Vpp = 33;
 458         else if (!(status & SS_XVCARD))
 459                 skt->socket.Vcc = skt->socket.Vpp = 50;
 460         else {
 461                 dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n");
 462                 return -EIO;
 463         }
 464
 465         if (skt->power_hook)
 466                 skt->power_hook(skt, HOOK_POWER_PRE);
 467
 468         skt->socket.flags = 0;
 469         skt->ops->set_socket(skt, &skt->socket);
 470
 471         /*
 472          * Wait "vcc_settle" for the supply to stabilise.
 473          */
 474         msleep(vcc_settle * 10);
 475
 476         skt->ops->get_status(skt, &status);
 477         if (!(status & SS_POWERON)) {
 478                 dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n");
 479                 return -EIO;
 480         }
 481
 482         status = socket_reset(skt);
 483
 484         if (skt->power_hook)
 485                 skt->power_hook(skt, HOOK_POWER_POST);
 486
 487         return status;
 488 }
 489
 490 /*
 491  * Handle card insertion.  Setup the socket, reset the card,
 492  * and then tell the rest of PCMCIA that a card is present.
 493  */
 494 static int socket_insert(struct pcmcia_socket *skt)
 495 {
 496         int ret;
 497
 498         dev_dbg(&skt->dev, "insert\n");
 499
 500         WARN_ON(skt->state & SOCKET_INUSE);
 501         skt->state |= SOCKET_INUSE;
 502
 503         ret = socket_setup(skt, setup_delay);
 504         if (ret == 0) {
 505                 skt->state |= SOCKET_PRESENT;
 506
 507                 dev_printk(KERN_NOTICE, &skt->dev,
 508                            "pccard: %s card inserted into slot %d\n",
 509                            (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
 510                            skt->sock);
 511
 512 #ifdef CONFIG_CARDBUS
 513                 if (skt->state & SOCKET_CARDBUS) {
 514                         cb_alloc(skt);
 515                         skt->state |= SOCKET_CARDBUS_CONFIG;
 516                 }
 517 #endif
 518                 dev_dbg(&skt->dev, "insert done\n");
 519
 520                 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 521         } else {
 522                 socket_shutdown(skt);
 523         }
 524
 525         return ret;
 526 }
 527
 528 static int socket_suspend(struct pcmcia_socket *skt)
 529 {
 530         if (skt->state & SOCKET_SUSPEND)
 531                 return -EBUSY;
 532
 533         skt->suspended_state = skt->state;
 534
 535         send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
 536         skt->socket = dead_socket;
 537         skt->ops->set_socket(skt, &skt->socket);
 538         if (skt->ops->suspend)
 539                 skt->ops->suspend(skt);
 540         skt->state |= SOCKET_SUSPEND;
 541
 542         return 0;
 543 }
 544
 545 static int socket_early_resume(struct pcmcia_socket *skt)
 546 {
 547         skt->socket = dead_socket;
 548         skt->ops->init(skt);
 549         skt->ops->set_socket(skt, &skt->socket);
 550         if (skt->state & SOCKET_PRESENT)
 551                 skt->resume_status = socket_setup(skt, resume_delay);
 552         return 0;
 553 }
 554
 555 static int socket_late_resume(struct pcmcia_socket *skt)
 556 {
 557         skt->state &= ~SOCKET_SUSPEND;
 558
 559         if (!(skt->state & SOCKET_PRESENT))
 560                 return socket_insert(skt);
 561
 562         if (skt->resume_status) {
 563                 socket_shutdown(skt);
 564                 return 0;
 565         }
 566
 567         if (skt->suspended_state != skt->state) {
 568                 dev_dbg(&skt->dev,
 569                         "suspend state 0x%x != resume state 0x%x\n",
 570                         skt->suspended_state, skt->state);
 571
 572                 socket_shutdown(skt);
 573                 return socket_insert(skt);
 574         }
 575
 576 #ifdef CONFIG_CARDBUS
 577         if (skt->state & SOCKET_CARDBUS) {
 578                 /* We can't be sure the CardBus card is the same
 579                  * as the one previously inserted. Therefore, remove
 580                  * and re-add... */
 581                 cb_free(skt);
 582                 cb_alloc(skt);
 583                 return 0;
 584         }
 585 #endif
 586
 587         send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
 588         return 0;
 589 }
 590
 591 /*
 592  * Resume a socket.  If a card is present, verify its CIS against
 593  * our cached copy.  If they are different, the card has been
 594  * replaced, and we need to tell the drivers.
 595  */
 596 static int socket_resume(struct pcmcia_socket *skt)
 597 {
 598         if (!(skt->state & SOCKET_SUSPEND))
 599                 return -EBUSY;
 600
 601         socket_early_resume(skt);
 602         return socket_late_resume(skt);
 603 }
 604
 605 static void socket_remove(struct pcmcia_socket *skt)
 606 {
 607         dev_printk(KERN_NOTICE, &skt->dev,
 608                    "pccard: card ejected from slot %d\n", skt->sock);
 609         socket_shutdown(skt);
 610 }
 611
 612 /*
 613  * Process a socket card detect status change.
 614  *
 615  * If we don't have a card already present, delay the detect event for
 616  * about 20ms (to be on the safe side) before reading the socket status.
 617  *
 618  * Some i82365-based systems send multiple SS_DETECT events during card
 619  * insertion, and the "card present" status bit seems to bounce.  This
 620  * will probably be true with GPIO-based card detection systems after
 621  * the product has aged.
 622  */
 623 static void socket_detect_change(struct pcmcia_socket *skt)
 624 {
 625         if (!(skt->state & SOCKET_SUSPEND)) {
 626                 int status;
 627
 628                 if (!(skt->state & SOCKET_PRESENT))
 629                         msleep(20);
 630
 631                 skt->ops->get_status(skt, &status);
 632                 if ((skt->state & SOCKET_PRESENT) &&
 633                      !(status & SS_DETECT))
 634                         socket_remove(skt);
 635                 if (!(skt->state & SOCKET_PRESENT) &&
 636                     (status & SS_DETECT))
 637                         socket_insert(skt);
 638         }
 639 }
 640
 641 static int pccardd(void *__skt)
 642 {
 643         struct pcmcia_socket *skt = __skt;
 644         int ret;
 645
 646         skt->thread = current;
 647         skt->socket = dead_socket;
 648         skt->ops->init(skt);
 649         skt->ops->set_socket(skt, &skt->socket);
 650
 651         /* register with the device core */
 652         ret = device_register(&skt->dev);
 653         if (ret) {
 654                 dev_printk(KERN_WARNING, &skt->dev,
 655                            "PCMCIA: unable to register socket\n");
 656                 skt->thread = NULL;
 657                 complete(&skt->thread_done);
 658                 return 0;
 659         }
 660         ret = pccard_sysfs_add_socket(&skt->dev);
 661         if (ret)
 662                 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
 663
 664         complete(&skt->thread_done);
 665
 666         set_freezable();
 667         for (;;) {
 668                 unsigned long flags;
 669                 unsigned int events;
 670
 671                 set_current_state(TASK_INTERRUPTIBLE);
 672
 673                 spin_lock_irqsave(&skt->thread_lock, flags);
 674                 events = skt->thread_events;
 675                 skt->thread_events = 0;
 676                 spin_unlock_irqrestore(&skt->thread_lock, flags);
 677
 678                 if (events) {
 679                         mutex_lock(&skt->skt_mutex);
 680                         if (events & SS_DETECT)
 681                                 socket_detect_change(skt);
 682                         if (events & SS_BATDEAD)
 683                                 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
 684                         if (events & SS_BATWARN)
 685                                 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
 686                         if (events & SS_READY)
 687                                 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
 688                         mutex_unlock(&skt->skt_mutex);
 689                         continue;
 690                 }
 691
 692                 if (kthread_should_stop())
 693                         break;
 694
 695                 schedule();
 696                 try_to_freeze();
 697         }
 698         /* make sure we are running before we exit */
 699         set_current_state(TASK_RUNNING);
 700
 701         /* shut down socket, if a device is still present */
 702         if (skt->state & SOCKET_PRESENT) {
 703                 mutex_lock(&skt->skt_mutex);
 704                 socket_remove(skt);
 705                 mutex_unlock(&skt->skt_mutex);
 706         }
 707
 708         /* remove from the device core */
 709         pccard_sysfs_remove_socket(&skt->dev);
 710         device_unregister(&skt->dev);
 711
 712         return 0;
 713 }
 714
 715 /*
 716  * Yenta (at least) probes interrupts before registering the socket and
 717  * starting the handler thread.
 718  */
 719 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
 720 {
 721         unsigned long flags;
 722         dev_dbg(&s->dev, "parse_events: events %08x\n", events);
 723         if (s->thread) {
 724                 spin_lock_irqsave(&s->thread_lock, flags);
 725                 s->thread_events |= events;
 726                 spin_unlock_irqrestore(&s->thread_lock, flags);
 727
 728                 wake_up_process(s->thread);
 729         }
 730 } /* pcmcia_parse_events */
 731 EXPORT_SYMBOL(pcmcia_parse_events);
 732
 733
 734 /* register pcmcia_callback */
 735 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
 736 {
 737         int ret = 0;
 738
 739         /* s->skt_mutex also protects s->callback */
 740         mutex_lock(&s->skt_mutex);
 741
 742         if (c) {
 743                 /* registration */
 744                 if (s->callback) {
 745                         ret = -EBUSY;
 746                         goto err;
 747                 }
 748
 749                 s->callback = c;
 750
 751                 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
 752                         send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 753         } else
 754                 s->callback = NULL;
 755  err:
 756         mutex_unlock(&s->skt_mutex);
 757
 758         return ret;
 759 }
 760 EXPORT_SYMBOL(pccard_register_pcmcia);
 761
 762
 763 /* I'm not sure which "reset" function this is supposed to use,
 764  * but for now, it uses the low-level interface's reset, not the
 765  * CIS register.
 766  */
 767
 768 int pcmcia_reset_card(struct pcmcia_socket *skt)
 769 {
 770         int ret;
 771
 772         dev_dbg(&skt->dev, "resetting socket\n");
 773
 774         mutex_lock(&skt->skt_mutex);
 775         do {
 776                 if (!(skt->state & SOCKET_PRESENT)) {
 777                         dev_dbg(&skt->dev, "can't reset, not present\n");
 778                         ret = -ENODEV;
 779                         break;
 780                 }
 781                 if (skt->state & SOCKET_SUSPEND) {
 782                         dev_dbg(&skt->dev, "can't reset, suspended\n");
 783                         ret = -EBUSY;
 784                         break;
 785                 }
 786                 if (skt->state & SOCKET_CARDBUS) {
 787                         dev_dbg(&skt->dev, "can't reset, is cardbus\n");
 788                         ret = -EPERM;
 789                         break;
 790                 }
 791
 792                 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW);
 793                 if (ret == 0) {
 794                         send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
 795                         if (skt->callback)
 796                                 skt->callback->suspend(skt);
 797                         if (socket_reset(skt) == 0) {
 798                                 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
 799                                 if (skt->callback)
 800                                         skt->callback->resume(skt);
 801                         }
 802                 }
 803
 804                 ret = 0;
 805         } while (0);
 806         mutex_unlock(&skt->skt_mutex);
 807
 808         return ret;
 809 } /* reset_card */
 810 EXPORT_SYMBOL(pcmcia_reset_card);
 811
 812
 813 /* These shut down or wake up a socket.  They are sort of user
 814  * initiated versions of the APM suspend and resume actions.
 815  */
 816 int pcmcia_suspend_card(struct pcmcia_socket *skt)
 817 {
 818         int ret;
 819
 820         dev_dbg(&skt->dev, "suspending socket\n");
 821
 822         mutex_lock(&skt->skt_mutex);
 823         do {
 824                 if (!(skt->state & SOCKET_PRESENT)) {
 825                         ret = -ENODEV;
 826                         break;
 827                 }
 828                 if (skt->state & SOCKET_CARDBUS) {
 829                         ret = -EPERM;
 830                         break;
 831                 }
 832                 if (skt->callback) {
 833                         ret = skt->callback->suspend(skt);
 834                         if (ret)
 835                                 break;
 836                 }
 837                 ret = socket_suspend(skt);
 838         } while (0);
 839         mutex_unlock(&skt->skt_mutex);
 840
 841         return ret;
 842 } /* suspend_card */
 843 EXPORT_SYMBOL(pcmcia_suspend_card);
 844
 845
 846 int pcmcia_resume_card(struct pcmcia_socket *skt)
 847 {
 848         int ret;
 849
 850         dev_dbg(&skt->dev, "waking up socket\n");
 851
 852         mutex_lock(&skt->skt_mutex);
 853         do {
 854                 if (!(skt->state & SOCKET_PRESENT)) {
 855                         ret = -ENODEV;
 856                         break;
 857                 }
 858                 if (skt->state & SOCKET_CARDBUS) {
 859                         ret = -EPERM;
 860                         break;
 861                 }
 862                 ret = socket_resume(skt);
 863                 if (!ret && skt->callback)
 864                         skt->callback->resume(skt);
 865         } while (0);
 866         mutex_unlock(&skt->skt_mutex);
 867
 868         return ret;
 869 } /* resume_card */
 870 EXPORT_SYMBOL(pcmcia_resume_card);
 871
 872
 873 /* These handle user requests to eject or insert a card. */
 874 int pcmcia_eject_card(struct pcmcia_socket *skt)
 875 {
 876         int ret;
 877
 878         dev_dbg(&skt->dev, "user eject request\n");
 879
 880         mutex_lock(&skt->skt_mutex);
 881         do {
 882                 if (!(skt->state & SOCKET_PRESENT)) {
 883                         ret = -ENODEV;
 884                         break;
 885                 }
 886
 887                 ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW);
 888                 if (ret != 0) {
 889                         ret = -EINVAL;
 890                         break;
 891                 }
 892
 893                 socket_remove(skt);
 894                 ret = 0;
 895         } while (0);
 896         mutex_unlock(&skt->skt_mutex);
 897
 898         return ret;
 899 } /* eject_card */
 900 EXPORT_SYMBOL(pcmcia_eject_card);
 901
 902
 903 int pcmcia_insert_card(struct pcmcia_socket *skt)
 904 {
 905         int ret;
 906
 907         dev_dbg(&skt->dev, "user insert request\n");
 908
 909         mutex_lock(&skt->skt_mutex);
 910         do {
 911                 if (skt->state & SOCKET_PRESENT) {
 912                         ret = -EBUSY;
 913                         break;
 914                 }
 915                 if (socket_insert(skt) == -ENODEV) {
 916                         ret = -ENODEV;
 917                         break;
 918                 }
 919                 ret = 0;
 920         } while (0);
 921         mutex_unlock(&skt->skt_mutex);
 922
 923         return ret;
 924 } /* insert_card */
 925 EXPORT_SYMBOL(pcmcia_insert_card);
 926
 927
 928 static int pcmcia_socket_uevent(struct device *dev,
 929                                 struct kobj_uevent_env *env)
 930 {
 931         struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 932
 933         if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
 934                 return -ENOMEM;
 935
 936         return 0;
 937 }
 938
 939
 940 static struct completion pcmcia_unload;
 941
 942 static void pcmcia_release_socket_class(struct class *data)
 943 {
 944         complete(&pcmcia_unload);
 945 }
 946
 947
 948 struct class pcmcia_socket_class = {
 949         .name = "pcmcia_socket",
 950         .dev_uevent = pcmcia_socket_uevent,
 951         .dev_release = pcmcia_release_socket,
 952         .class_release = pcmcia_release_socket_class,
 953 };
 954 EXPORT_SYMBOL(pcmcia_socket_class);
 955
 956
 957 static int __init init_pcmcia_cs(void)
 958 {
 959         init_completion(&pcmcia_unload);
 960         return class_register(&pcmcia_socket_class);
 961 }
 962
 963 static void __exit exit_pcmcia_cs(void)
 964 {
 965         class_unregister(&pcmcia_socket_class);
 966         wait_for_completion(&pcmcia_unload);
 967 }
 968
 969 subsys_initcall(init_pcmcia_cs);
 970 module_exit(exit_pcmcia_cs);
 971