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