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/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
  44 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
  45 MODULE_DESCRIPTION("Linux Kernel Card Services");
  46 MODULE_LICENSE("GPL");
  47
  48 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
  49
  50 INT_MODULE_PARM(setup_delay,    10);            /* centiseconds */
  51 INT_MODULE_PARM(resume_delay,   20);            /* centiseconds */
  52 INT_MODULE_PARM(shutdown_delay, 3);             /* centiseconds */
  53 INT_MODULE_PARM(vcc_settle,     40);            /* centiseconds */
  54 INT_MODULE_PARM(reset_time,     10);            /* usecs */
  55 INT_MODULE_PARM(unreset_delay,  10);            /* centiseconds */
  56 INT_MODULE_PARM(unreset_check,  10);            /* centiseconds */
  57 INT_MODULE_PARM(unreset_limit,  30);            /* unreset_check's */
  58
  59 /* Access speed for attribute memory windows */
  60 INT_MODULE_PARM(cis_speed,      300);           /* ns */
  61
  62
  63 socket_state_t dead_socket = {
  64         .csc_mask       = SS_DETECT,
  65 };
  66 EXPORT_SYMBOL(dead_socket);
  67
  68
  69 /* List of all sockets, protected by a rwsem */
  70 LIST_HEAD(pcmcia_socket_list);
  71 EXPORT_SYMBOL(pcmcia_socket_list);
  72
  73 DECLARE_RWSEM(pcmcia_socket_list_rwsem);
  74 EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
  75
  76
  77 struct 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 }
  84 EXPORT_SYMBOL(pcmcia_get_socket);
  85
  86
  87 void pcmcia_put_socket(struct pcmcia_socket *skt)
  88 {
  89         put_device(&skt->dev);
  90 }
  91 EXPORT_SYMBOL(pcmcia_put_socket);
  92
  93
  94 static 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
 101 static int pccardd(void *__skt);
 102
 103 /**
 104  * pcmcia_register_socket - add a new pcmcia socket device
 105  * @socket: the &socket to register
 106  */
 107 int 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 */
 203 EXPORT_SYMBOL(pcmcia_register_socket);
 204
 205
 206 /**
 207  * pcmcia_unregister_socket - remove a pcmcia socket device
 208  * @socket: the &socket to unregister
 209  */
 210 void 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 */
 233 EXPORT_SYMBOL(pcmcia_unregister_socket);
 234
 235
 236 struct 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 }
 251 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
 252
 253 static 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  */
 289 static 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
 336 static 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  */
 416 static 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
 457 static 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
 474 static 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
 486 static 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  */
 535 static 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
 544 static 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  */
 562 static 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
 580 static 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  */
 687 void 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 */
 699 EXPORT_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  */
 712 void 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 }
 724 EXPORT_SYMBOL(pcmcia_parse_uevents);
 725
 726
 727 /* register pcmcia_callback */
 728 int 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 }
 753 EXPORT_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
 761 int 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 */
 799 EXPORT_SYMBOL(pcmcia_reset_card);
 800
 801
 802 static 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
 814 static struct completion pcmcia_unload;
 815
 816 static void pcmcia_release_socket_class(struct class *data)
 817 {
 818         complete(&pcmcia_unload);
 819 }
 820
 821
 822 #ifdef CONFIG_PM
 823
 824 static 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
 837 static int pcmcia_socket_dev_suspend_noirq(struct device *dev)
 838 {
 839         return __pcmcia_pm_op(dev, socket_suspend);
 840 }
 841
 842 static int pcmcia_socket_dev_resume_noirq(struct device *dev)
 843 {
 844         return __pcmcia_pm_op(dev, socket_early_resume);
 845 }
 846
 847 static int __used pcmcia_socket_dev_resume(struct device *dev)
 848 {
 849         return __pcmcia_pm_op(dev, socket_late_resume);
 850 }
 851
 852 static 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
 876 struct 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 };
 883 EXPORT_SYMBOL(pcmcia_socket_class);
 884
 885
 886 static int __init init_pcmcia_cs(void)
 887 {
 888         init_completion(&pcmcia_unload);
 889         return class_register(&pcmcia_socket_class);
 890 }
 891
 892 static void __exit exit_pcmcia_cs(void)
 893 {
 894         class_unregister(&pcmcia_socket_class);
 895         wait_for_completion(&pcmcia_unload);
 896 }
 897
 898 subsys_initcall(init_pcmcia_cs);
 899 module_exit(exit_pcmcia_cs);
 900