drivers/pcmcia/cs.c

   1 /*
   2  * cs.c -- Kernel Card Services - core services
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * The initial developer of the original code is David A. Hinds
   9  * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
  10  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
  11  *
  12  * (C) 1999             David A. Hinds
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/moduleparam.h>
  17 #include <linux/init.h>
  18 #include <linux/kernel.h>
  19 #include <linux/string.h>
  20 #include <linux/major.h>
  21 #include <linux/errno.h>
  22 #include <linux/slab.h>
  23 #include <linux/mm.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/timer.h>
  26 #include <linux/ioport.h>
  27 #include <linux/delay.h>
  28 #include <linux/pm.h>
  29 #include <linux/device.h>
  30 #include <linux/kthread.h>
  31 #include <linux/freezer.h>
  32 #include <asm/system.h>
  33 #include <asm/irq.h>
  34
  35 #include <pcmcia/cs_types.h>
  36 #include <pcmcia/ss.h>
  37 #include <pcmcia/cs.h>
  38 #include <pcmcia/cistpl.h>
  39 #include <pcmcia/cisreg.h>
  40 #include <pcmcia/ds.h>
  41 #include "cs_internal.h"
  42
  43
  44 /* Module parameters */
  45
  46 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
  47 MODULE_DESCRIPTION("Linux Kernel Card Services");
  48 MODULE_LICENSE("GPL");
  49
  50 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
  51
  52 INT_MODULE_PARM(setup_delay,    10);            /* centiseconds */
  53 INT_MODULE_PARM(resume_delay,   20);            /* centiseconds */
  54 INT_MODULE_PARM(shutdown_delay, 3);             /* centiseconds */
  55 INT_MODULE_PARM(vcc_settle,     40);            /* centiseconds */
  56 INT_MODULE_PARM(reset_time,     10);            /* usecs */
  57 INT_MODULE_PARM(unreset_delay,  10);            /* centiseconds */
  58 INT_MODULE_PARM(unreset_check,  10);            /* centiseconds */
  59 INT_MODULE_PARM(unreset_limit,  30);            /* unreset_check's */
  60
  61 /* Access speed for attribute memory windows */
  62 INT_MODULE_PARM(cis_speed,      300);           /* ns */
  63
  64
  65 socket_state_t dead_socket = {
  66         .csc_mask       = SS_DETECT,
  67 };
  68 EXPORT_SYMBOL(dead_socket);
  69
  70
  71 /* List of all sockets, protected by a rwsem */
  72 LIST_HEAD(pcmcia_socket_list);
  73 EXPORT_SYMBOL(pcmcia_socket_list);
  74
  75 DECLARE_RWSEM(pcmcia_socket_list_rwsem);
  76 EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
  77
  78
  79 struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt)
  80 {
  81         struct device *dev = get_device(&skt->dev);
  82         if (!dev)
  83                 return NULL;
  84         return dev_get_drvdata(dev);
  85 }
  86 EXPORT_SYMBOL(pcmcia_get_socket);
  87
  88
  89 void pcmcia_put_socket(struct pcmcia_socket *skt)
  90 {
  91         put_device(&skt->dev);
  92 }
  93 EXPORT_SYMBOL(pcmcia_put_socket);
  94
  95
  96 static void pcmcia_release_socket(struct device *dev)
  97 {
  98         struct pcmcia_socket *socket = dev_get_drvdata(dev);
  99
 100         complete(&socket->socket_released);
 101 }
 102
 103 static int pccardd(void *__skt);
 104
 105 /**
 106  * pcmcia_register_socket - add a new pcmcia socket device
 107  * @socket: the &socket to register
 108  */
 109 int pcmcia_register_socket(struct pcmcia_socket *socket)
 110 {
 111         struct task_struct *tsk;
 112         int ret;
 113
 114         if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
 115                 return -EINVAL;
 116
 117         dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);
 118
 119         /* try to obtain a socket number [yes, it gets ugly if we
 120          * register more than 2^sizeof(unsigned int) pcmcia
 121          * sockets... but the socket number is deprecated
 122          * anyways, so I don't care] */
 123         down_write(&pcmcia_socket_list_rwsem);
 124         if (list_empty(&pcmcia_socket_list))
 125                 socket->sock = 0;
 126         else {
 127                 unsigned int found, i = 1;
 128                 struct pcmcia_socket *tmp;
 129                 do {
 130                         found = 1;
 131                         list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
 132                                 if (tmp->sock == i)
 133                                         found = 0;
 134                         }
 135                         i++;
 136                 } while (!found);
 137                 socket->sock = i - 1;
 138         }
 139         list_add_tail(&socket->socket_list, &pcmcia_socket_list);
 140         up_write(&pcmcia_socket_list_rwsem);
 141
 142 #ifndef CONFIG_CARDBUS
 143         /*
 144          * If we do not support Cardbus, ensure that
 145          * the Cardbus socket capability is disabled.
 146          */
 147         socket->features &= ~SS_CAP_CARDBUS;
 148 #endif
 149
 150         /* set proper values in socket->dev */
 151         dev_set_drvdata(&socket->dev, socket);
 152         socket->dev.class = &pcmcia_socket_class;
 153         dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock);
 154
 155         /* base address = 0, map = 0 */
 156         socket->cis_mem.flags = 0;
 157         socket->cis_mem.speed = cis_speed;
 158
 159         INIT_LIST_HEAD(&socket->cis_cache);
 160
 161         init_completion(&socket->socket_released);
 162         init_completion(&socket->thread_done);
 163         mutex_init(&socket->skt_mutex);
 164         mutex_init(&socket->ops_mutex);
 165         spin_lock_init(&socket->thread_lock);
 166
 167         if (socket->resource_ops->init) {
 168                 mutex_lock(&socket->ops_mutex);
 169                 ret = socket->resource_ops->init(socket);
 170                 mutex_unlock(&socket->ops_mutex);
 171                 if (ret)
 172                         goto err;
 173         }
 174
 175         tsk = kthread_run(pccardd, socket, "pccardd");
 176         if (IS_ERR(tsk)) {
 177                 ret = PTR_ERR(tsk);
 178                 goto err;
 179         }
 180
 181         wait_for_completion(&socket->thread_done);
 182         if (!socket->thread) {
 183                 dev_printk(KERN_WARNING, &socket->dev,
 184                            "PCMCIA: warning: socket thread did not start\n");
 185                 return -EIO;
 186         }
 187
 188         pcmcia_parse_events(socket, SS_DETECT);
 189
 190         /*
 191          * Let's try to get the PCMCIA module for 16-bit PCMCIA support.
 192          * If it fails, it doesn't matter -- we still have 32-bit CardBus
 193          * support to offer, so this is not a failure mode.
 194          */
 195         request_module_nowait("pcmcia");
 196
 197         return 0;
 198
 199  err:
 200         down_write(&pcmcia_socket_list_rwsem);
 201         list_del(&socket->socket_list);
 202         up_write(&pcmcia_socket_list_rwsem);
 203         return ret;
 204 } /* pcmcia_register_socket */
 205 EXPORT_SYMBOL(pcmcia_register_socket);
 206
 207
 208 /**
 209  * pcmcia_unregister_socket - remove a pcmcia socket device
 210  * @socket: the &socket to unregister
 211  */
 212 void pcmcia_unregister_socket(struct pcmcia_socket *socket)
 213 {
 214         if (!socket)
 215                 return;
 216
 217         dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
 218
 219         if (socket->thread)
 220                 kthread_stop(socket->thread);
 221
 222         /* remove from our own list */
 223         down_write(&pcmcia_socket_list_rwsem);
 224         list_del(&socket->socket_list);
 225         up_write(&pcmcia_socket_list_rwsem);
 226
 227         /* wait for sysfs to drop all references */
 228         if (socket->resource_ops->exit) {
 229                 mutex_lock(&socket->ops_mutex);
 230                 socket->resource_ops->exit(socket);
 231                 mutex_unlock(&socket->ops_mutex);
 232         }
 233         wait_for_completion(&socket->socket_released);
 234 } /* pcmcia_unregister_socket */
 235 EXPORT_SYMBOL(pcmcia_unregister_socket);
 236
 237
 238 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr)
 239 {
 240         struct pcmcia_socket *s;
 241
 242         down_read(&pcmcia_socket_list_rwsem);
 243         list_for_each_entry(s, &pcmcia_socket_list, socket_list)
 244                 if (s->sock == nr) {
 245                         up_read(&pcmcia_socket_list_rwsem);
 246                         return s;
 247                 }
 248         up_read(&pcmcia_socket_list_rwsem);
 249
 250         return NULL;
 251
 252 }
 253 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
 254
 255 /*
 256  * The central event handler.  Send_event() sends an event to the
 257  * 16-bit subsystem, which then calls the relevant device drivers.
 258  * Parse_events() interprets the event bits from
 259  * a card status change report.  Do_shutdown() handles the high
 260  * priority stuff associated with a card removal.
 261  */
 262
 263 /* NOTE: send_event needs to be called with skt->sem held. */
 264
 265 static int send_event(struct pcmcia_socket *s, event_t event, int priority)
 266 {
 267         int ret;
 268
 269         if ((s->state & SOCKET_CARDBUS) && (event != CS_EVENT_CARD_REMOVAL))
 270                 return 0;
 271
 272         dev_dbg(&s->dev, "send_event(event %d, pri %d, callback 0x%p)\n",
 273            event, priority, s->callback);
 274
 275         if (!s->callback)
 276                 return 0;
 277         if (!try_module_get(s->callback->owner))
 278                 return 0;
 279
 280         ret = s->callback->event(s, event, priority);
 281
 282         module_put(s->callback->owner);
 283
 284         return ret;
 285 }
 286
 287 static int socket_reset(struct pcmcia_socket *skt)
 288 {
 289         int status, i;
 290
 291         dev_dbg(&skt->dev, "reset\n");
 292
 293         skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
 294         skt->ops->set_socket(skt, &skt->socket);
 295         udelay((long)reset_time);
 296
 297         skt->socket.flags &= ~SS_RESET;
 298         skt->ops->set_socket(skt, &skt->socket);
 299
 300         msleep(unreset_delay * 10);
 301         for (i = 0; i < unreset_limit; i++) {
 302                 skt->ops->get_status(skt, &status);
 303
 304                 if (!(status & SS_DETECT))
 305                         return -ENODEV;
 306
 307                 if (status & SS_READY)
 308                         return 0;
 309
 310                 msleep(unreset_check * 10);
 311         }
 312
 313         dev_printk(KERN_ERR, &skt->dev, "time out after reset.\n");
 314         return -ETIMEDOUT;
 315 }
 316
 317 /*
 318  * socket_setup() and socket_shutdown() are called by the main event handler
 319  * when card insertion and removal events are received.
 320  * socket_setup() turns on socket power and resets the socket, in two stages.
 321  * socket_shutdown() unconfigures a socket and turns off socket power.
 322  */
 323 static void socket_shutdown(struct pcmcia_socket *s)
 324 {
 325         int status;
 326
 327         dev_dbg(&s->dev, "shutdown\n");
 328
 329         send_event(s, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
 330
 331         mutex_lock(&s->ops_mutex);
 332         s->state &= SOCKET_INUSE | SOCKET_PRESENT;
 333         msleep(shutdown_delay * 10);
 334         s->state &= SOCKET_INUSE;
 335
 336         /* Blank out the socket state */
 337         s->socket = dead_socket;
 338         s->ops->init(s);
 339         s->ops->set_socket(s, &s->socket);
 340         s->irq.AssignedIRQ = s->irq.Config = 0;
 341         s->lock_count = 0;
 342         kfree(s->fake_cis);
 343         s->fake_cis = NULL;
 344         s->functions = 0;
 345
 346         /* From here on we can be sure that only we (that is, the
 347          * pccardd thread) accesses this socket, and all (16-bit)
 348          * PCMCIA interactions are gone. Therefore, release
 349          * ops_mutex so that we don't get a sysfs-related lockdep
 350          * warning.
 351          */
 352         mutex_unlock(&s->ops_mutex);
 353
 354 #ifdef CONFIG_CARDBUS
 355         cb_free(s);
 356 #endif
 357
 358         /* give socket some time to power down */
 359         msleep(100);
 360
 361         s->ops->get_status(s, &status);
 362         if (status & SS_POWERON) {
 363                 dev_printk(KERN_ERR, &s->dev,
 364                            "*** DANGER *** unable to remove socket power\n");
 365         }
 366
 367         s->state &= ~SOCKET_INUSE;
 368 }
 369
 370 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
 371 {
 372         int status, i;
 373
 374         dev_dbg(&skt->dev, "setup\n");
 375
 376         skt->ops->get_status(skt, &status);
 377         if (!(status & SS_DETECT))
 378                 return -ENODEV;
 379
 380         msleep(initial_delay * 10);
 381
 382         for (i = 0; i < 100; i++) {
 383                 skt->ops->get_status(skt, &status);
 384                 if (!(status & SS_DETECT))
 385                         return -ENODEV;
 386
 387                 if (!(status & SS_PENDING))
 388                         break;
 389
 390                 msleep(100);
 391         }
 392
 393         if (status & SS_PENDING) {
 394                 dev_printk(KERN_ERR, &skt->dev,
 395                            "voltage interrogation timed out.\n");
 396                 return -ETIMEDOUT;
 397         }
 398
 399         if (status & SS_CARDBUS) {
 400                 if (!(skt->features & SS_CAP_CARDBUS)) {
 401                         dev_printk(KERN_ERR, &skt->dev,
 402                                 "cardbus cards are not supported.\n");
 403                         return -EINVAL;
 404                 }
 405                 skt->state |= SOCKET_CARDBUS;
 406         } else
 407                 skt->state &= ~SOCKET_CARDBUS;
 408
 409         /*
 410          * Decode the card voltage requirements, and apply power to the card.
 411          */
 412         if (status & SS_3VCARD)
 413                 skt->socket.Vcc = skt->socket.Vpp = 33;
 414         else if (!(status & SS_XVCARD))
 415                 skt->socket.Vcc = skt->socket.Vpp = 50;
 416         else {
 417                 dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n");
 418                 return -EIO;
 419         }
 420
 421         if (skt->power_hook)
 422                 skt->power_hook(skt, HOOK_POWER_PRE);
 423
 424         skt->socket.flags = 0;
 425         skt->ops->set_socket(skt, &skt->socket);
 426
 427         /*
 428          * Wait "vcc_settle" for the supply to stabilise.
 429          */
 430         msleep(vcc_settle * 10);
 431
 432         skt->ops->get_status(skt, &status);
 433         if (!(status & SS_POWERON)) {
 434                 dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n");
 435                 return -EIO;
 436         }
 437
 438         status = socket_reset(skt);
 439
 440         if (skt->power_hook)
 441                 skt->power_hook(skt, HOOK_POWER_POST);
 442
 443         return status;
 444 }
 445
 446 /*
 447  * Handle card insertion.  Setup the socket, reset the card,
 448  * and then tell the rest of PCMCIA that a card is present.
 449  */
 450 static int socket_insert(struct pcmcia_socket *skt)
 451 {
 452         int ret;
 453
 454         dev_dbg(&skt->dev, "insert\n");
 455
 456         mutex_lock(&skt->ops_mutex);
 457         if (skt->state & SOCKET_INUSE) {
 458                 mutex_unlock(&skt->ops_mutex);
 459                 return -EINVAL;
 460         }
 461         skt->state |= SOCKET_INUSE;
 462
 463         ret = socket_setup(skt, setup_delay);
 464         if (ret == 0) {
 465                 skt->state |= SOCKET_PRESENT;
 466
 467                 dev_printk(KERN_NOTICE, &skt->dev,
 468                            "pccard: %s card inserted into slot %d\n",
 469                            (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
 470                            skt->sock);
 471
 472 #ifdef CONFIG_CARDBUS
 473                 if (skt->state & SOCKET_CARDBUS) {
 474                         cb_alloc(skt);
 475                         skt->state |= SOCKET_CARDBUS_CONFIG;
 476                 }
 477 #endif
 478                 dev_dbg(&skt->dev, "insert done\n");
 479                 mutex_unlock(&skt->ops_mutex);
 480
 481                 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 482         } else {
 483                 mutex_unlock(&skt->ops_mutex);
 484                 socket_shutdown(skt);
 485         }
 486
 487         return ret;
 488 }
 489
 490 static int socket_suspend(struct pcmcia_socket *skt)
 491 {
 492         if (skt->state & SOCKET_SUSPEND)
 493                 return -EBUSY;
 494
 495         mutex_lock(&skt->ops_mutex);
 496         skt->suspended_state = skt->state;
 497
 498         send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
 499         skt->socket = dead_socket;
 500         skt->ops->set_socket(skt, &skt->socket);
 501         if (skt->ops->suspend)
 502                 skt->ops->suspend(skt);
 503         skt->state |= SOCKET_SUSPEND;
 504         mutex_unlock(&skt->ops_mutex);
 505         return 0;
 506 }
 507
 508 static int socket_early_resume(struct pcmcia_socket *skt)
 509 {
 510         mutex_lock(&skt->ops_mutex);
 511         skt->socket = dead_socket;
 512         skt->ops->init(skt);
 513         skt->ops->set_socket(skt, &skt->socket);
 514         if (skt->state & SOCKET_PRESENT)
 515                 skt->resume_status = socket_setup(skt, resume_delay);
 516         mutex_unlock(&skt->ops_mutex);
 517         return 0;
 518 }
 519
 520 static int socket_late_resume(struct pcmcia_socket *skt)
 521 {
 522         int ret;
 523
 524         mutex_lock(&skt->ops_mutex);
 525         skt->state &= ~SOCKET_SUSPEND;
 526         mutex_unlock(&skt->ops_mutex);
 527
 528         if (!(skt->state & SOCKET_PRESENT)) {
 529                 ret = socket_insert(skt);
 530                 if (ret == -ENODEV)
 531                         ret = 0;
 532                 return ret;
 533         }
 534
 535         if (skt->resume_status) {
 536                 socket_shutdown(skt);
 537                 return 0;
 538         }
 539
 540         if (skt->suspended_state != skt->state) {
 541                 dev_dbg(&skt->dev,
 542                         "suspend state 0x%x != resume state 0x%x\n",
 543                         skt->suspended_state, skt->state);
 544
 545                 socket_shutdown(skt);
 546                 return socket_insert(skt);
 547         }
 548
 549 #ifdef CONFIG_CARDBUS
 550         if (skt->state & SOCKET_CARDBUS) {
 551                 /* We can't be sure the CardBus card is the same
 552                  * as the one previously inserted. Therefore, remove
 553                  * and re-add... */
 554                 cb_free(skt);
 555                 cb_alloc(skt);
 556                 return 0;
 557         }
 558 #endif
 559
 560         send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
 561         return 0;
 562 }
 563
 564 /*
 565  * Resume a socket.  If a card is present, verify its CIS against
 566  * our cached copy.  If they are different, the card has been
 567  * replaced, and we need to tell the drivers.
 568  */
 569 static int socket_resume(struct pcmcia_socket *skt)
 570 {
 571         if (!(skt->state & SOCKET_SUSPEND))
 572                 return -EBUSY;
 573
 574         socket_early_resume(skt);
 575         return socket_late_resume(skt);
 576 }
 577
 578 static void socket_remove(struct pcmcia_socket *skt)
 579 {
 580         dev_printk(KERN_NOTICE, &skt->dev,
 581                    "pccard: card ejected from slot %d\n", skt->sock);
 582         socket_shutdown(skt);
 583 }
 584
 585 /*
 586  * Process a socket card detect status change.
 587  *
 588  * If we don't have a card already present, delay the detect event for
 589  * about 20ms (to be on the safe side) before reading the socket status.
 590  *
 591  * Some i82365-based systems send multiple SS_DETECT events during card
 592  * insertion, and the "card present" status bit seems to bounce.  This
 593  * will probably be true with GPIO-based card detection systems after
 594  * the product has aged.
 595  */
 596 static void socket_detect_change(struct pcmcia_socket *skt)
 597 {
 598         if (!(skt->state & SOCKET_SUSPEND)) {
 599                 int status;
 600
 601                 if (!(skt->state & SOCKET_PRESENT))
 602                         msleep(20);
 603
 604                 skt->ops->get_status(skt, &status);
 605                 if ((skt->state & SOCKET_PRESENT) &&
 606                      !(status & SS_DETECT))
 607                         socket_remove(skt);
 608                 if (!(skt->state & SOCKET_PRESENT) &&
 609                     (status & SS_DETECT))
 610                         socket_insert(skt);
 611         }
 612 }
 613
 614 static int pccardd(void *__skt)
 615 {
 616         struct pcmcia_socket *skt = __skt;
 617         int ret;
 618
 619         skt->thread = current;
 620         skt->socket = dead_socket;
 621         skt->ops->init(skt);
 622         skt->ops->set_socket(skt, &skt->socket);
 623
 624         /* register with the device core */
 625         ret = device_register(&skt->dev);
 626         if (ret) {
 627                 dev_printk(KERN_WARNING, &skt->dev,
 628                            "PCMCIA: unable to register socket\n");
 629                 skt->thread = NULL;
 630                 complete(&skt->thread_done);
 631                 return 0;
 632         }
 633         ret = pccard_sysfs_add_socket(&skt->dev);
 634         if (ret)
 635                 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
 636
 637         complete(&skt->thread_done);
 638
 639         /* wait for userspace to catch up */
 640         msleep(250);
 641
 642         set_freezable();
 643         for (;;) {
 644                 unsigned long flags;
 645                 unsigned int events;
 646                 unsigned int sysfs_events;
 647
 648                 set_current_state(TASK_INTERRUPTIBLE);
 649
 650                 spin_lock_irqsave(&skt->thread_lock, flags);
 651                 events = skt->thread_events;
 652                 skt->thread_events = 0;
 653                 sysfs_events = skt->sysfs_events;
 654                 skt->sysfs_events = 0;
 655                 spin_unlock_irqrestore(&skt->thread_lock, flags);
 656
 657                 mutex_lock(&skt->skt_mutex);
 658                 if (events) {
 659                         if (events & SS_DETECT)
 660                                 socket_detect_change(skt);
 661                         if (events & SS_BATDEAD)
 662                                 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
 663                         if (events & SS_BATWARN)
 664                                 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
 665                         if (events & SS_READY)
 666                                 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
 667                 }
 668
 669                 if (sysfs_events) {
 670                         if (sysfs_events & PCMCIA_UEVENT_EJECT)
 671                                 socket_remove(skt);
 672                         if (sysfs_events & PCMCIA_UEVENT_INSERT)
 673                                 socket_insert(skt);
 674                         if ((sysfs_events & PCMCIA_UEVENT_RESUME) &&
 675                                 !(skt->state & SOCKET_CARDBUS)) {
 676                                 ret = socket_resume(skt);
 677                                 if (!ret && skt->callback)
 678                                         skt->callback->resume(skt);
 679                         }
 680                         if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) &&
 681                                 !(skt->state & SOCKET_CARDBUS)) {
 682                                 if (skt->callback)
 683                                         ret = skt->callback->suspend(skt);
 684                                 else
 685                                         ret = 0;
 686                                 if (!ret)
 687                                         socket_suspend(skt);
 688                         }
 689                         if ((sysfs_events & PCMCIA_UEVENT_REQUERY) &&
 690                                 !(skt->state & SOCKET_CARDBUS)) {
 691                                 if (!ret && skt->callback)
 692                                         skt->callback->requery(skt);
 693                         }
 694                 }
 695                 mutex_unlock(&skt->skt_mutex);
 696
 697                 if (events || sysfs_events)
 698                         continue;
 699
 700                 if (kthread_should_stop())
 701                         break;
 702
 703                 schedule();
 704                 try_to_freeze();
 705         }
 706         /* make sure we are running before we exit */
 707         set_current_state(TASK_RUNNING);
 708
 709         /* shut down socket, if a device is still present */
 710         if (skt->state & SOCKET_PRESENT) {
 711                 mutex_lock(&skt->skt_mutex);
 712                 socket_remove(skt);
 713                 mutex_unlock(&skt->skt_mutex);
 714         }
 715
 716         /* remove from the device core */
 717         pccard_sysfs_remove_socket(&skt->dev);
 718         device_unregister(&skt->dev);
 719
 720         return 0;
 721 }
 722
 723 /*
 724  * Yenta (at least) probes interrupts before registering the socket and
 725  * starting the handler thread.
 726  */
 727 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
 728 {
 729         unsigned long flags;
 730         dev_dbg(&s->dev, "parse_events: events %08x\n", events);
 731         if (s->thread) {
 732                 spin_lock_irqsave(&s->thread_lock, flags);
 733                 s->thread_events |= events;
 734                 spin_unlock_irqrestore(&s->thread_lock, flags);
 735
 736                 wake_up_process(s->thread);
 737         }
 738 } /* pcmcia_parse_events */
 739 EXPORT_SYMBOL(pcmcia_parse_events);
 740
 741 /**
 742  * pcmcia_parse_uevents() - tell pccardd to issue manual commands
 743  * @s:          the PCMCIA socket we wan't to command
 744  * @events:     events to pass to pccardd
 745  *
 746  * userspace-issued insert, eject, suspend and resume commands must be
 747  * handled by pccardd to avoid any sysfs-related deadlocks. Valid events
 748  * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert),
 749  * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend)
 750  * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card).
 751  */
 752 void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events)
 753 {
 754         unsigned long flags;
 755         dev_dbg(&s->dev, "parse_uevents: events %08x\n", events);
 756         if (s->thread) {
 757                 spin_lock_irqsave(&s->thread_lock, flags);
 758                 s->sysfs_events |= events;
 759                 spin_unlock_irqrestore(&s->thread_lock, flags);
 760
 761                 wake_up_process(s->thread);
 762         }
 763 }
 764 EXPORT_SYMBOL(pcmcia_parse_uevents);
 765
 766
 767 /* register pcmcia_callback */
 768 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
 769 {
 770         int ret = 0;
 771
 772         /* s->skt_mutex also protects s->callback */
 773         mutex_lock(&s->skt_mutex);
 774
 775         if (c) {
 776                 /* registration */
 777                 if (s->callback) {
 778                         ret = -EBUSY;
 779                         goto err;
 780                 }
 781
 782                 s->callback = c;
 783
 784                 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
 785                         send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 786         } else
 787                 s->callback = NULL;
 788  err:
 789         mutex_unlock(&s->skt_mutex);
 790
 791         return ret;
 792 }
 793 EXPORT_SYMBOL(pccard_register_pcmcia);
 794
 795
 796 /* I'm not sure which "reset" function this is supposed to use,
 797  * but for now, it uses the low-level interface's reset, not the
 798  * CIS register.
 799  */
 800
 801 int pcmcia_reset_card(struct pcmcia_socket *skt)
 802 {
 803         int ret;
 804
 805         dev_dbg(&skt->dev, "resetting socket\n");
 806
 807         mutex_lock(&skt->skt_mutex);
 808         do {
 809                 if (!(skt->state & SOCKET_PRESENT)) {
 810                         dev_dbg(&skt->dev, "can't reset, not present\n");
 811                         ret = -ENODEV;
 812                         break;
 813                 }
 814                 if (skt->state & SOCKET_SUSPEND) {
 815                         dev_dbg(&skt->dev, "can't reset, suspended\n");
 816                         ret = -EBUSY;
 817                         break;
 818                 }
 819                 if (skt->state & SOCKET_CARDBUS) {
 820                         dev_dbg(&skt->dev, "can't reset, is cardbus\n");
 821                         ret = -EPERM;
 822                         break;
 823                 }
 824
 825                 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW);
 826                 if (ret == 0) {
 827                         send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
 828                         if (skt->callback)
 829                                 skt->callback->suspend(skt);
 830                         mutex_lock(&skt->ops_mutex);
 831                         ret = socket_reset(skt);
 832                         mutex_unlock(&skt->ops_mutex);
 833                         if (ret == 0) {
 834                                 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
 835                                 if (skt->callback)
 836                                         skt->callback->resume(skt);
 837                         }
 838                 }
 839
 840                 ret = 0;
 841         } while (0);
 842         mutex_unlock(&skt->skt_mutex);
 843
 844         return ret;
 845 } /* reset_card */
 846 EXPORT_SYMBOL(pcmcia_reset_card);
 847
 848
 849 static int pcmcia_socket_uevent(struct device *dev,
 850                                 struct kobj_uevent_env *env)
 851 {
 852         struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 853
 854         if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
 855                 return -ENOMEM;
 856
 857         return 0;
 858 }
 859
 860
 861 static struct completion pcmcia_unload;
 862
 863 static void pcmcia_release_socket_class(struct class *data)
 864 {
 865         complete(&pcmcia_unload);
 866 }
 867
 868
 869 #ifdef CONFIG_PM
 870
 871 static int __pcmcia_pm_op(struct device *dev,
 872                           int (*callback) (struct pcmcia_socket *skt))
 873 {
 874         struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 875         int ret;
 876
 877         mutex_lock(&s->skt_mutex);
 878         ret = callback(s);
 879         mutex_unlock(&s->skt_mutex);
 880
 881         return ret;
 882 }
 883
 884 static int pcmcia_socket_dev_suspend_noirq(struct device *dev)
 885 {
 886         return __pcmcia_pm_op(dev, socket_suspend);
 887 }
 888
 889 static int pcmcia_socket_dev_resume_noirq(struct device *dev)
 890 {
 891         return __pcmcia_pm_op(dev, socket_early_resume);
 892 }
 893
 894 static int pcmcia_socket_dev_resume(struct device *dev)
 895 {
 896         return __pcmcia_pm_op(dev, socket_late_resume);
 897 }
 898
 899 static const struct dev_pm_ops pcmcia_socket_pm_ops = {
 900         /* dev_resume may be called with IRQs enabled */
 901         SET_SYSTEM_SLEEP_PM_OPS(NULL,
 902                                 pcmcia_socket_dev_resume)
 903
 904         /* late suspend must be called with IRQs disabled */
 905         .suspend_noirq = pcmcia_socket_dev_suspend_noirq,
 906         .freeze_noirq = pcmcia_socket_dev_suspend_noirq,
 907         .poweroff_noirq = pcmcia_socket_dev_suspend_noirq,
 908
 909         /* early resume must be called with IRQs disabled */
 910         .resume_noirq = pcmcia_socket_dev_resume_noirq,
 911         .thaw_noirq = pcmcia_socket_dev_resume_noirq,
 912         .restore_noirq = pcmcia_socket_dev_resume_noirq,
 913 };
 914
 915 #define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops)
 916
 917 #else /* CONFIG_PM */
 918
 919 #define PCMCIA_SOCKET_CLASS_PM_OPS NULL
 920
 921 #endif /* CONFIG_PM */
 922
 923 struct class pcmcia_socket_class = {
 924         .name = "pcmcia_socket",
 925         .dev_uevent = pcmcia_socket_uevent,
 926         .dev_release = pcmcia_release_socket,
 927         .class_release = pcmcia_release_socket_class,
 928         .pm = PCMCIA_SOCKET_CLASS_PM_OPS,
 929 };
 930 EXPORT_SYMBOL(pcmcia_socket_class);
 931
 932
 933 static int __init init_pcmcia_cs(void)
 934 {
 935         init_completion(&pcmcia_unload);
 936         return class_register(&pcmcia_socket_class);
 937 }
 938
 939 static void __exit exit_pcmcia_cs(void)
 940 {
 941         class_unregister(&pcmcia_socket_class);
 942         wait_for_completion(&pcmcia_unload);
 943 }
 944
 945 subsys_initcall(init_pcmcia_cs);
 946 module_exit(exit_pcmcia_cs);
 947