drivers/pcmcia/cs.c

   1 /*
   2  * cs.c -- Kernel Card Services - core services
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * The initial developer of the original code is David A. Hinds
   9  * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
  10  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
  11  *
  12  * (C) 1999             David A. Hinds
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/moduleparam.h>
  17 #include <linux/init.h>
  18 #include <linux/kernel.h>
  19 #include <linux/string.h>
  20 #include <linux/major.h>
  21 #include <linux/errno.h>
  22 #include <linux/slab.h>
  23 #include <linux/mm.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/timer.h>
  26 #include <linux/ioport.h>
  27 #include <linux/delay.h>
  28 #include <linux/pm.h>
  29 #include <linux/device.h>
  30 #include <linux/kthread.h>
  31 #include <linux/freezer.h>
  32 #include <asm/system.h>
  33 #include <asm/irq.h>
  34
  35 #include <pcmcia/cs_types.h>
  36 #include <pcmcia/ss.h>
  37 #include <pcmcia/cs.h>
  38 #include <pcmcia/cistpl.h>
  39 #include <pcmcia/cisreg.h>
  40 #include <pcmcia/ds.h>
  41 #include "cs_internal.h"
  42
  43
  44 /* Module parameters */
  45
  46 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
  47 MODULE_DESCRIPTION("Linux Kernel Card Services");
  48 MODULE_LICENSE("GPL");
  49
  50 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
  51
  52 INT_MODULE_PARM(setup_delay,    10);            /* centiseconds */
  53 INT_MODULE_PARM(resume_delay,   20);            /* centiseconds */
  54 INT_MODULE_PARM(shutdown_delay, 3);             /* centiseconds */
  55 INT_MODULE_PARM(vcc_settle,     40);            /* centiseconds */
  56 INT_MODULE_PARM(reset_time,     10);            /* usecs */
  57 INT_MODULE_PARM(unreset_delay,  10);            /* centiseconds */
  58 INT_MODULE_PARM(unreset_check,  10);            /* centiseconds */
  59 INT_MODULE_PARM(unreset_limit,  30);            /* unreset_check's */
  60
  61 /* Access speed for attribute memory windows */
  62 INT_MODULE_PARM(cis_speed,      300);           /* ns */
  63
  64
  65 socket_state_t dead_socket = {
  66         .csc_mask       = SS_DETECT,
  67 };
  68 EXPORT_SYMBOL(dead_socket);
  69
  70
  71 /* List of all sockets, protected by a rwsem */
  72 LIST_HEAD(pcmcia_socket_list);
  73 EXPORT_SYMBOL(pcmcia_socket_list);
  74
  75 DECLARE_RWSEM(pcmcia_socket_list_rwsem);
  76 EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
  77
  78
  79 /*
  80  * Low-level PCMCIA socket drivers need to register with the PCCard
  81  * core using pcmcia_register_socket.
  82  *
  83  * socket drivers are expected to use the following callbacks in their
  84  * .drv struct:
  85  *  - pcmcia_socket_dev_suspend
  86  *  - pcmcia_socket_dev_resume
  87  * These functions check for the appropriate struct pcmcia_soket arrays,
  88  * and pass them to the low-level functions pcmcia_{suspend,resume}_socket
  89  */
  90 static int socket_early_resume(struct pcmcia_socket *skt);
  91 static int socket_late_resume(struct pcmcia_socket *skt);
  92 static int socket_resume(struct pcmcia_socket *skt);
  93 static int socket_suspend(struct pcmcia_socket *skt);
  94
  95 static void pcmcia_socket_dev_run(struct device *dev,
  96                                   int (*cb)(struct pcmcia_socket *))
  97 {
  98         struct pcmcia_socket *socket;
  99
 100         down_read(&pcmcia_socket_list_rwsem);
 101         list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
 102                 if (socket->dev.parent != dev)
 103                         continue;
 104                 mutex_lock(&socket->skt_mutex);
 105                 cb(socket);
 106                 mutex_unlock(&socket->skt_mutex);
 107         }
 108         up_read(&pcmcia_socket_list_rwsem);
 109 }
 110
 111 int pcmcia_socket_dev_suspend(struct device *dev)
 112 {
 113         pcmcia_socket_dev_run(dev, socket_suspend);
 114         return 0;
 115 }
 116 EXPORT_SYMBOL(pcmcia_socket_dev_suspend);
 117
 118 void pcmcia_socket_dev_early_resume(struct device *dev)
 119 {
 120         pcmcia_socket_dev_run(dev, socket_early_resume);
 121 }
 122 EXPORT_SYMBOL(pcmcia_socket_dev_early_resume);
 123
 124 void pcmcia_socket_dev_late_resume(struct device *dev)
 125 {
 126         pcmcia_socket_dev_run(dev, socket_late_resume);
 127 }
 128 EXPORT_SYMBOL(pcmcia_socket_dev_late_resume);
 129
 130 int pcmcia_socket_dev_resume(struct device *dev)
 131 {
 132         pcmcia_socket_dev_run(dev, socket_resume);
 133         return 0;
 134 }
 135 EXPORT_SYMBOL(pcmcia_socket_dev_resume);
 136
 137
 138 struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt)
 139 {
 140         struct device *dev = get_device(&skt->dev);
 141         if (!dev)
 142                 return NULL;
 143         return dev_get_drvdata(dev);
 144 }
 145 EXPORT_SYMBOL(pcmcia_get_socket);
 146
 147
 148 void pcmcia_put_socket(struct pcmcia_socket *skt)
 149 {
 150         put_device(&skt->dev);
 151 }
 152 EXPORT_SYMBOL(pcmcia_put_socket);
 153
 154
 155 static void pcmcia_release_socket(struct device *dev)
 156 {
 157         struct pcmcia_socket *socket = dev_get_drvdata(dev);
 158
 159         complete(&socket->socket_released);
 160 }
 161
 162 static int pccardd(void *__skt);
 163
 164 /**
 165  * pcmcia_register_socket - add a new pcmcia socket device
 166  * @socket: the &socket to register
 167  */
 168 int pcmcia_register_socket(struct pcmcia_socket *socket)
 169 {
 170         struct task_struct *tsk;
 171         int ret;
 172
 173         if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
 174                 return -EINVAL;
 175
 176         dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);
 177
 178         /* try to obtain a socket number [yes, it gets ugly if we
 179          * register more than 2^sizeof(unsigned int) pcmcia
 180          * sockets... but the socket number is deprecated
 181          * anyways, so I don't care] */
 182         down_write(&pcmcia_socket_list_rwsem);
 183         if (list_empty(&pcmcia_socket_list))
 184                 socket->sock = 0;
 185         else {
 186                 unsigned int found, i = 1;
 187                 struct pcmcia_socket *tmp;
 188                 do {
 189                         found = 1;
 190                         list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
 191                                 if (tmp->sock == i)
 192                                         found = 0;
 193                         }
 194                         i++;
 195                 } while (!found);
 196                 socket->sock = i - 1;
 197         }
 198         list_add_tail(&socket->socket_list, &pcmcia_socket_list);
 199         up_write(&pcmcia_socket_list_rwsem);
 200
 201 #ifndef CONFIG_CARDBUS
 202         /*
 203          * If we do not support Cardbus, ensure that
 204          * the Cardbus socket capability is disabled.
 205          */
 206         socket->features &= ~SS_CAP_CARDBUS;
 207 #endif
 208
 209         /* set proper values in socket->dev */
 210         dev_set_drvdata(&socket->dev, socket);
 211         socket->dev.class = &pcmcia_socket_class;
 212         dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock);
 213
 214         /* base address = 0, map = 0 */
 215         socket->cis_mem.flags = 0;
 216         socket->cis_mem.speed = cis_speed;
 217
 218         INIT_LIST_HEAD(&socket->cis_cache);
 219
 220         init_completion(&socket->socket_released);
 221         init_completion(&socket->thread_done);
 222         mutex_init(&socket->skt_mutex);
 223         mutex_init(&socket->ops_mutex);
 224         spin_lock_init(&socket->thread_lock);
 225
 226         if (socket->resource_ops->init) {
 227                 mutex_lock(&socket->ops_mutex);
 228                 ret = socket->resource_ops->init(socket);
 229                 mutex_unlock(&socket->ops_mutex);
 230                 if (ret)
 231                         goto err;
 232         }
 233
 234         tsk = kthread_run(pccardd, socket, "pccardd");
 235         if (IS_ERR(tsk)) {
 236                 ret = PTR_ERR(tsk);
 237                 goto err;
 238         }
 239
 240         wait_for_completion(&socket->thread_done);
 241         if (!socket->thread) {
 242                 dev_printk(KERN_WARNING, &socket->dev,
 243                            "PCMCIA: warning: socket thread did not start\n");
 244                 return -EIO;
 245         }
 246
 247         pcmcia_parse_events(socket, SS_DETECT);
 248
 249         /*
 250          * Let's try to get the PCMCIA module for 16-bit PCMCIA support.
 251          * If it fails, it doesn't matter -- we still have 32-bit CardBus
 252          * support to offer, so this is not a failure mode.
 253          */
 254         request_module_nowait("pcmcia");
 255
 256         return 0;
 257
 258  err:
 259         down_write(&pcmcia_socket_list_rwsem);
 260         list_del(&socket->socket_list);
 261         up_write(&pcmcia_socket_list_rwsem);
 262         return ret;
 263 } /* pcmcia_register_socket */
 264 EXPORT_SYMBOL(pcmcia_register_socket);
 265
 266
 267 /**
 268  * pcmcia_unregister_socket - remove a pcmcia socket device
 269  * @socket: the &socket to unregister
 270  */
 271 void pcmcia_unregister_socket(struct pcmcia_socket *socket)
 272 {
 273         if (!socket)
 274                 return;
 275
 276         dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
 277
 278         if (socket->thread)
 279                 kthread_stop(socket->thread);
 280
 281         /* remove from our own list */
 282         down_write(&pcmcia_socket_list_rwsem);
 283         list_del(&socket->socket_list);
 284         up_write(&pcmcia_socket_list_rwsem);
 285
 286         /* wait for sysfs to drop all references */
 287         if (socket->resource_ops->exit) {
 288                 mutex_lock(&socket->ops_mutex);
 289                 socket->resource_ops->exit(socket);
 290                 mutex_unlock(&socket->ops_mutex);
 291         }
 292         wait_for_completion(&socket->socket_released);
 293 } /* pcmcia_unregister_socket */
 294 EXPORT_SYMBOL(pcmcia_unregister_socket);
 295
 296
 297 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr)
 298 {
 299         struct pcmcia_socket *s;
 300
 301         down_read(&pcmcia_socket_list_rwsem);
 302         list_for_each_entry(s, &pcmcia_socket_list, socket_list)
 303                 if (s->sock == nr) {
 304                         up_read(&pcmcia_socket_list_rwsem);
 305                         return s;
 306                 }
 307         up_read(&pcmcia_socket_list_rwsem);
 308
 309         return NULL;
 310
 311 }
 312 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
 313
 314 /*
 315  * The central event handler.  Send_event() sends an event to the
 316  * 16-bit subsystem, which then calls the relevant device drivers.
 317  * Parse_events() interprets the event bits from
 318  * a card status change report.  Do_shutdown() handles the high
 319  * priority stuff associated with a card removal.
 320  */
 321
 322 /* NOTE: send_event needs to be called with skt->sem held. */
 323
 324 static int send_event(struct pcmcia_socket *s, event_t event, int priority)
 325 {
 326         int ret;
 327
 328         if ((s->state & SOCKET_CARDBUS) && (event != CS_EVENT_CARD_REMOVAL))
 329                 return 0;
 330
 331         dev_dbg(&s->dev, "send_event(event %d, pri %d, callback 0x%p)\n",
 332            event, priority, s->callback);
 333
 334         if (!s->callback)
 335                 return 0;
 336         if (!try_module_get(s->callback->owner))
 337                 return 0;
 338
 339         ret = s->callback->event(s, event, priority);
 340
 341         module_put(s->callback->owner);
 342
 343         return ret;
 344 }
 345
 346 static int socket_reset(struct pcmcia_socket *skt)
 347 {
 348         int status, i;
 349
 350         dev_dbg(&skt->dev, "reset\n");
 351
 352         skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
 353         skt->ops->set_socket(skt, &skt->socket);
 354         udelay((long)reset_time);
 355
 356         skt->socket.flags &= ~SS_RESET;
 357         skt->ops->set_socket(skt, &skt->socket);
 358
 359         msleep(unreset_delay * 10);
 360         for (i = 0; i < unreset_limit; i++) {
 361                 skt->ops->get_status(skt, &status);
 362
 363                 if (!(status & SS_DETECT))
 364                         return -ENODEV;
 365
 366                 if (status & SS_READY)
 367                         return 0;
 368
 369                 msleep(unreset_check * 10);
 370         }
 371
 372         dev_printk(KERN_ERR, &skt->dev, "time out after reset.\n");
 373         return -ETIMEDOUT;
 374 }
 375
 376 /*
 377  * socket_setup() and socket_shutdown() are called by the main event handler
 378  * when card insertion and removal events are received.
 379  * socket_setup() turns on socket power and resets the socket, in two stages.
 380  * socket_shutdown() unconfigures a socket and turns off socket power.
 381  */
 382 static void socket_shutdown(struct pcmcia_socket *s)
 383 {
 384         int status;
 385
 386         dev_dbg(&s->dev, "shutdown\n");
 387
 388         send_event(s, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
 389
 390         mutex_lock(&s->ops_mutex);
 391         s->state &= SOCKET_INUSE | SOCKET_PRESENT;
 392         msleep(shutdown_delay * 10);
 393         s->state &= SOCKET_INUSE;
 394
 395         /* Blank out the socket state */
 396         s->socket = dead_socket;
 397         s->ops->init(s);
 398         s->ops->set_socket(s, &s->socket);
 399         s->irq.AssignedIRQ = s->irq.Config = 0;
 400         s->lock_count = 0;
 401         kfree(s->fake_cis);
 402         s->fake_cis = NULL;
 403 #ifdef CONFIG_CARDBUS
 404         cb_free(s);
 405 #endif
 406         s->functions = 0;
 407
 408         /* give socket some time to power down */
 409         msleep(100);
 410
 411         s->ops->get_status(s, &status);
 412         if (status & SS_POWERON) {
 413                 dev_printk(KERN_ERR, &s->dev,
 414                            "*** DANGER *** unable to remove socket power\n");
 415         }
 416
 417         s->state &= ~SOCKET_INUSE;
 418         mutex_unlock(&s->ops_mutex);
 419 }
 420
 421 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
 422 {
 423         int status, i;
 424
 425         dev_dbg(&skt->dev, "setup\n");
 426
 427         skt->ops->get_status(skt, &status);
 428         if (!(status & SS_DETECT))
 429                 return -ENODEV;
 430
 431         msleep(initial_delay * 10);
 432
 433         for (i = 0; i < 100; i++) {
 434                 skt->ops->get_status(skt, &status);
 435                 if (!(status & SS_DETECT))
 436                         return -ENODEV;
 437
 438                 if (!(status & SS_PENDING))
 439                         break;
 440
 441                 msleep(100);
 442         }
 443
 444         if (status & SS_PENDING) {
 445                 dev_printk(KERN_ERR, &skt->dev,
 446                            "voltage interrogation timed out.\n");
 447                 return -ETIMEDOUT;
 448         }
 449
 450         if (status & SS_CARDBUS) {
 451                 if (!(skt->features & SS_CAP_CARDBUS)) {
 452                         dev_printk(KERN_ERR, &skt->dev,
 453                                 "cardbus cards are not supported.\n");
 454                         return -EINVAL;
 455                 }
 456                 skt->state |= SOCKET_CARDBUS;
 457         } else
 458                 skt->state &= ~SOCKET_CARDBUS;
 459
 460         /*
 461          * Decode the card voltage requirements, and apply power to the card.
 462          */
 463         if (status & SS_3VCARD)
 464                 skt->socket.Vcc = skt->socket.Vpp = 33;
 465         else if (!(status & SS_XVCARD))
 466                 skt->socket.Vcc = skt->socket.Vpp = 50;
 467         else {
 468                 dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n");
 469                 return -EIO;
 470         }
 471
 472         if (skt->power_hook)
 473                 skt->power_hook(skt, HOOK_POWER_PRE);
 474
 475         skt->socket.flags = 0;
 476         skt->ops->set_socket(skt, &skt->socket);
 477
 478         /*
 479          * Wait "vcc_settle" for the supply to stabilise.
 480          */
 481         msleep(vcc_settle * 10);
 482
 483         skt->ops->get_status(skt, &status);
 484         if (!(status & SS_POWERON)) {
 485                 dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n");
 486                 return -EIO;
 487         }
 488
 489         status = socket_reset(skt);
 490
 491         if (skt->power_hook)
 492                 skt->power_hook(skt, HOOK_POWER_POST);
 493
 494         return status;
 495 }
 496
 497 /*
 498  * Handle card insertion.  Setup the socket, reset the card,
 499  * and then tell the rest of PCMCIA that a card is present.
 500  */
 501 static int socket_insert(struct pcmcia_socket *skt)
 502 {
 503         int ret;
 504
 505         dev_dbg(&skt->dev, "insert\n");
 506
 507         mutex_lock(&skt->ops_mutex);
 508         WARN_ON(skt->state & SOCKET_INUSE);
 509         skt->state |= SOCKET_INUSE;
 510
 511         ret = socket_setup(skt, setup_delay);
 512         if (ret == 0) {
 513                 skt->state |= SOCKET_PRESENT;
 514
 515                 dev_printk(KERN_NOTICE, &skt->dev,
 516                            "pccard: %s card inserted into slot %d\n",
 517                            (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
 518                            skt->sock);
 519
 520 #ifdef CONFIG_CARDBUS
 521                 if (skt->state & SOCKET_CARDBUS) {
 522                         cb_alloc(skt);
 523                         skt->state |= SOCKET_CARDBUS_CONFIG;
 524                 }
 525 #endif
 526                 dev_dbg(&skt->dev, "insert done\n");
 527                 mutex_unlock(&skt->ops_mutex);
 528
 529                 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 530         } else {
 531                 mutex_unlock(&skt->ops_mutex);
 532                 socket_shutdown(skt);
 533         }
 534
 535         return ret;
 536 }
 537
 538 static int socket_suspend(struct pcmcia_socket *skt)
 539 {
 540         if (skt->state & SOCKET_SUSPEND)
 541                 return -EBUSY;
 542
 543         mutex_lock(&skt->ops_mutex);
 544         skt->suspended_state = skt->state;
 545
 546         send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
 547         skt->socket = dead_socket;
 548         skt->ops->set_socket(skt, &skt->socket);
 549         if (skt->ops->suspend)
 550                 skt->ops->suspend(skt);
 551         skt->state |= SOCKET_SUSPEND;
 552         mutex_unlock(&skt->ops_mutex);
 553         return 0;
 554 }
 555
 556 static int socket_early_resume(struct pcmcia_socket *skt)
 557 {
 558         mutex_lock(&skt->ops_mutex);
 559         skt->socket = dead_socket;
 560         skt->ops->init(skt);
 561         skt->ops->set_socket(skt, &skt->socket);
 562         if (skt->state & SOCKET_PRESENT)
 563                 skt->resume_status = socket_setup(skt, resume_delay);
 564         mutex_unlock(&skt->ops_mutex);
 565         return 0;
 566 }
 567
 568 static int socket_late_resume(struct pcmcia_socket *skt)
 569 {
 570         mutex_lock(&skt->ops_mutex);
 571         skt->state &= ~SOCKET_SUSPEND;
 572         mutex_unlock(&skt->ops_mutex);
 573
 574         if (!(skt->state & SOCKET_PRESENT))
 575                 return socket_insert(skt);
 576
 577         if (skt->resume_status) {
 578                 socket_shutdown(skt);
 579                 return 0;
 580         }
 581
 582         if (skt->suspended_state != skt->state) {
 583                 dev_dbg(&skt->dev,
 584                         "suspend state 0x%x != resume state 0x%x\n",
 585                         skt->suspended_state, skt->state);
 586
 587                 socket_shutdown(skt);
 588                 return socket_insert(skt);
 589         }
 590
 591 #ifdef CONFIG_CARDBUS
 592         if (skt->state & SOCKET_CARDBUS) {
 593                 /* We can't be sure the CardBus card is the same
 594                  * as the one previously inserted. Therefore, remove
 595                  * and re-add... */
 596                 cb_free(skt);
 597                 cb_alloc(skt);
 598                 return 0;
 599         }
 600 #endif
 601
 602         send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
 603         return 0;
 604 }
 605
 606 /*
 607  * Resume a socket.  If a card is present, verify its CIS against
 608  * our cached copy.  If they are different, the card has been
 609  * replaced, and we need to tell the drivers.
 610  */
 611 static int socket_resume(struct pcmcia_socket *skt)
 612 {
 613         if (!(skt->state & SOCKET_SUSPEND))
 614                 return -EBUSY;
 615
 616         socket_early_resume(skt);
 617         return socket_late_resume(skt);
 618 }
 619
 620 static void socket_remove(struct pcmcia_socket *skt)
 621 {
 622         dev_printk(KERN_NOTICE, &skt->dev,
 623                    "pccard: card ejected from slot %d\n", skt->sock);
 624         socket_shutdown(skt);
 625 }
 626
 627 /*
 628  * Process a socket card detect status change.
 629  *
 630  * If we don't have a card already present, delay the detect event for
 631  * about 20ms (to be on the safe side) before reading the socket status.
 632  *
 633  * Some i82365-based systems send multiple SS_DETECT events during card
 634  * insertion, and the "card present" status bit seems to bounce.  This
 635  * will probably be true with GPIO-based card detection systems after
 636  * the product has aged.
 637  */
 638 static void socket_detect_change(struct pcmcia_socket *skt)
 639 {
 640         if (!(skt->state & SOCKET_SUSPEND)) {
 641                 int status;
 642
 643                 if (!(skt->state & SOCKET_PRESENT))
 644                         msleep(20);
 645
 646                 skt->ops->get_status(skt, &status);
 647                 if ((skt->state & SOCKET_PRESENT) &&
 648                      !(status & SS_DETECT))
 649                         socket_remove(skt);
 650                 if (!(skt->state & SOCKET_PRESENT) &&
 651                     (status & SS_DETECT))
 652                         socket_insert(skt);
 653         }
 654 }
 655
 656 static int pccardd(void *__skt)
 657 {
 658         struct pcmcia_socket *skt = __skt;
 659         int ret;
 660
 661         skt->thread = current;
 662         skt->socket = dead_socket;
 663         skt->ops->init(skt);
 664         skt->ops->set_socket(skt, &skt->socket);
 665
 666         /* register with the device core */
 667         ret = device_register(&skt->dev);
 668         if (ret) {
 669                 dev_printk(KERN_WARNING, &skt->dev,
 670                            "PCMCIA: unable to register socket\n");
 671                 skt->thread = NULL;
 672                 complete(&skt->thread_done);
 673                 return 0;
 674         }
 675         ret = pccard_sysfs_add_socket(&skt->dev);
 676         if (ret)
 677                 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
 678
 679         complete(&skt->thread_done);
 680
 681         set_freezable();
 682         for (;;) {
 683                 unsigned long flags;
 684                 unsigned int events;
 685
 686                 set_current_state(TASK_INTERRUPTIBLE);
 687
 688                 spin_lock_irqsave(&skt->thread_lock, flags);
 689                 events = skt->thread_events;
 690                 skt->thread_events = 0;
 691                 spin_unlock_irqrestore(&skt->thread_lock, flags);
 692
 693                 if (events) {
 694                         mutex_lock(&skt->skt_mutex);
 695                         if (events & SS_DETECT)
 696                                 socket_detect_change(skt);
 697                         if (events & SS_BATDEAD)
 698                                 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
 699                         if (events & SS_BATWARN)
 700                                 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
 701                         if (events & SS_READY)
 702                                 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
 703                         mutex_unlock(&skt->skt_mutex);
 704                         continue;
 705                 }
 706
 707                 if (kthread_should_stop())
 708                         break;
 709
 710                 schedule();
 711                 try_to_freeze();
 712         }
 713         /* make sure we are running before we exit */
 714         set_current_state(TASK_RUNNING);
 715
 716         /* shut down socket, if a device is still present */
 717         if (skt->state & SOCKET_PRESENT) {
 718                 mutex_lock(&skt->skt_mutex);
 719                 socket_remove(skt);
 720                 mutex_unlock(&skt->skt_mutex);
 721         }
 722
 723         /* remove from the device core */
 724         pccard_sysfs_remove_socket(&skt->dev);
 725         device_unregister(&skt->dev);
 726
 727         return 0;
 728 }
 729
 730 /*
 731  * Yenta (at least) probes interrupts before registering the socket and
 732  * starting the handler thread.
 733  */
 734 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
 735 {
 736         unsigned long flags;
 737         dev_dbg(&s->dev, "parse_events: events %08x\n", events);
 738         if (s->thread) {
 739                 spin_lock_irqsave(&s->thread_lock, flags);
 740                 s->thread_events |= events;
 741                 spin_unlock_irqrestore(&s->thread_lock, flags);
 742
 743                 wake_up_process(s->thread);
 744         }
 745 } /* pcmcia_parse_events */
 746 EXPORT_SYMBOL(pcmcia_parse_events);
 747
 748
 749 /* register pcmcia_callback */
 750 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
 751 {
 752         int ret = 0;
 753
 754         /* s->skt_mutex also protects s->callback */
 755         mutex_lock(&s->skt_mutex);
 756
 757         if (c) {
 758                 /* registration */
 759                 if (s->callback) {
 760                         ret = -EBUSY;
 761                         goto err;
 762                 }
 763
 764                 s->callback = c;
 765
 766                 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
 767                         send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 768         } else
 769                 s->callback = NULL;
 770  err:
 771         mutex_unlock(&s->skt_mutex);
 772
 773         return ret;
 774 }
 775 EXPORT_SYMBOL(pccard_register_pcmcia);
 776
 777
 778 /* I'm not sure which "reset" function this is supposed to use,
 779  * but for now, it uses the low-level interface's reset, not the
 780  * CIS register.
 781  */
 782
 783 int pcmcia_reset_card(struct pcmcia_socket *skt)
 784 {
 785         int ret;
 786
 787         dev_dbg(&skt->dev, "resetting socket\n");
 788
 789         mutex_lock(&skt->skt_mutex);
 790         do {
 791                 if (!(skt->state & SOCKET_PRESENT)) {
 792                         dev_dbg(&skt->dev, "can't reset, not present\n");
 793                         ret = -ENODEV;
 794                         break;
 795                 }
 796                 if (skt->state & SOCKET_SUSPEND) {
 797                         dev_dbg(&skt->dev, "can't reset, suspended\n");
 798                         ret = -EBUSY;
 799                         break;
 800                 }
 801                 if (skt->state & SOCKET_CARDBUS) {
 802                         dev_dbg(&skt->dev, "can't reset, is cardbus\n");
 803                         ret = -EPERM;
 804                         break;
 805                 }
 806
 807                 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW);
 808                 if (ret == 0) {
 809                         send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
 810                         if (skt->callback)
 811                                 skt->callback->suspend(skt);
 812                         mutex_lock(&skt->ops_mutex);
 813                         ret = socket_reset(skt);
 814                         mutex_unlock(&skt->ops_mutex);
 815                         if (ret == 0) {
 816                                 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
 817                                 if (skt->callback)
 818                                         skt->callback->resume(skt);
 819                         }
 820                 }
 821
 822                 ret = 0;
 823         } while (0);
 824         mutex_unlock(&skt->skt_mutex);
 825
 826         return ret;
 827 } /* reset_card */
 828 EXPORT_SYMBOL(pcmcia_reset_card);
 829
 830
 831 /* These shut down or wake up a socket.  They are sort of user
 832  * initiated versions of the APM suspend and resume actions.
 833  */
 834 int pcmcia_suspend_card(struct pcmcia_socket *skt)
 835 {
 836         int ret;
 837
 838         dev_dbg(&skt->dev, "suspending socket\n");
 839
 840         mutex_lock(&skt->skt_mutex);
 841         do {
 842                 if (!(skt->state & SOCKET_PRESENT)) {
 843                         ret = -ENODEV;
 844                         break;
 845                 }
 846                 if (skt->state & SOCKET_CARDBUS) {
 847                         ret = -EPERM;
 848                         break;
 849                 }
 850                 if (skt->callback) {
 851                         ret = skt->callback->suspend(skt);
 852                         if (ret)
 853                                 break;
 854                 }
 855                 ret = socket_suspend(skt);
 856         } while (0);
 857         mutex_unlock(&skt->skt_mutex);
 858
 859         return ret;
 860 } /* suspend_card */
 861 EXPORT_SYMBOL(pcmcia_suspend_card);
 862
 863
 864 int pcmcia_resume_card(struct pcmcia_socket *skt)
 865 {
 866         int ret;
 867
 868         dev_dbg(&skt->dev, "waking up socket\n");
 869
 870         mutex_lock(&skt->skt_mutex);
 871         do {
 872                 if (!(skt->state & SOCKET_PRESENT)) {
 873                         ret = -ENODEV;
 874                         break;
 875                 }
 876                 if (skt->state & SOCKET_CARDBUS) {
 877                         ret = -EPERM;
 878                         break;
 879                 }
 880                 ret = socket_resume(skt);
 881                 if (!ret && skt->callback)
 882                         skt->callback->resume(skt);
 883         } while (0);
 884         mutex_unlock(&skt->skt_mutex);
 885
 886         return ret;
 887 } /* resume_card */
 888 EXPORT_SYMBOL(pcmcia_resume_card);
 889
 890
 891 /* These handle user requests to eject or insert a card. */
 892 int pcmcia_eject_card(struct pcmcia_socket *skt)
 893 {
 894         int ret;
 895
 896         dev_dbg(&skt->dev, "user eject request\n");
 897
 898         mutex_lock(&skt->skt_mutex);
 899         do {
 900                 if (!(skt->state & SOCKET_PRESENT)) {
 901                         ret = -ENODEV;
 902                         break;
 903                 }
 904
 905                 ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW);
 906                 if (ret != 0) {
 907                         ret = -EINVAL;
 908                         break;
 909                 }
 910
 911                 socket_remove(skt);
 912                 ret = 0;
 913         } while (0);
 914         mutex_unlock(&skt->skt_mutex);
 915
 916         return ret;
 917 } /* eject_card */
 918 EXPORT_SYMBOL(pcmcia_eject_card);
 919
 920
 921 int pcmcia_insert_card(struct pcmcia_socket *skt)
 922 {
 923         int ret;
 924
 925         dev_dbg(&skt->dev, "user insert request\n");
 926
 927         mutex_lock(&skt->skt_mutex);
 928         do {
 929                 if (skt->state & SOCKET_PRESENT) {
 930                         ret = -EBUSY;
 931                         break;
 932                 }
 933                 if (socket_insert(skt) == -ENODEV) {
 934                         ret = -ENODEV;
 935                         break;
 936                 }
 937                 ret = 0;
 938         } while (0);
 939         mutex_unlock(&skt->skt_mutex);
 940
 941         return ret;
 942 } /* insert_card */
 943 EXPORT_SYMBOL(pcmcia_insert_card);
 944
 945
 946 static int pcmcia_socket_uevent(struct device *dev,
 947                                 struct kobj_uevent_env *env)
 948 {
 949         struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 950
 951         if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
 952                 return -ENOMEM;
 953
 954         return 0;
 955 }
 956
 957
 958 static struct completion pcmcia_unload;
 959
 960 static void pcmcia_release_socket_class(struct class *data)
 961 {
 962         complete(&pcmcia_unload);
 963 }
 964
 965
 966 struct class pcmcia_socket_class = {
 967         .name = "pcmcia_socket",
 968         .dev_uevent = pcmcia_socket_uevent,
 969         .dev_release = pcmcia_release_socket,
 970         .class_release = pcmcia_release_socket_class,
 971 };
 972 EXPORT_SYMBOL(pcmcia_socket_class);
 973
 974
 975 static int __init init_pcmcia_cs(void)
 976 {
 977         init_completion(&pcmcia_unload);
 978         return class_register(&pcmcia_socket_class);
 979 }
 980
 981 static void __exit exit_pcmcia_cs(void)
 982 {
 983         class_unregister(&pcmcia_socket_class);
 984         wait_for_completion(&pcmcia_unload);
 985 }
 986
 987 subsys_initcall(init_pcmcia_cs);
 988 module_exit(exit_pcmcia_cs);
 989