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