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/config.h>
  20 #include <linux/string.h>
  21 #include <linux/major.h>
  22 #include <linux/errno.h>
  23 #include <linux/slab.h>
  24 #include <linux/mm.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/timer.h>
  27 #include <linux/ioport.h>
  28 #include <linux/delay.h>
  29 #include <linux/pm.h>
  30 #include <linux/pci.h>
  31 #include <linux/device.h>
  32 #include <asm/system.h>
  33 #include <asm/irq.h>
  34
  35 #define IN_CARD_SERVICES
  36 #include <pcmcia/cs_types.h>
  37 #include <pcmcia/ss.h>
  38 #include <pcmcia/cs.h>
  39 #include <pcmcia/bulkmem.h>
  40 #include <pcmcia/cistpl.h>
  41 #include <pcmcia/cisreg.h>
  42 #include <pcmcia/ds.h>
  43 #include "cs_internal.h"
  44
  45
  46 /* Module parameters */
  47
  48 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
  49 MODULE_DESCRIPTION("Linux Kernel Card Services");
  50 MODULE_LICENSE("GPL");
  51
  52 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
  53
  54 INT_MODULE_PARM(setup_delay,    10);            /* centiseconds */
  55 INT_MODULE_PARM(resume_delay,   20);            /* centiseconds */
  56 INT_MODULE_PARM(shutdown_delay, 3);             /* centiseconds */
  57 INT_MODULE_PARM(vcc_settle,     40);            /* centiseconds */
  58 INT_MODULE_PARM(reset_time,     10);            /* usecs */
  59 INT_MODULE_PARM(unreset_delay,  10);            /* centiseconds */
  60 INT_MODULE_PARM(unreset_check,  10);            /* centiseconds */
  61 INT_MODULE_PARM(unreset_limit,  30);            /* unreset_check's */
  62
  63 /* Access speed for attribute memory windows */
  64 INT_MODULE_PARM(cis_speed,      300);           /* ns */
  65
  66 #ifdef DEBUG
  67 static int pc_debug;
  68
  69 module_param(pc_debug, int, 0644);
  70
  71 int cs_debug_level(int level)
  72 {
  73         return pc_debug > level;
  74 }
  75 #endif
  76
  77
  78 socket_state_t dead_socket = {
  79         .csc_mask       = SS_DETECT,
  80 };
  81 EXPORT_SYMBOL(dead_socket);
  82
  83
  84 /* List of all sockets, protected by a rwsem */
  85 LIST_HEAD(pcmcia_socket_list);
  86 EXPORT_SYMBOL(pcmcia_socket_list);
  87
  88 DECLARE_RWSEM(pcmcia_socket_list_rwsem);
  89 EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
  90
  91
  92 /**
  93  * Low-level PCMCIA socket drivers need to register with the PCCard
  94  * core using pcmcia_register_socket.
  95  *
  96  * socket drivers are expected to use the following callbacks in their
  97  * .drv struct:
  98  *  - pcmcia_socket_dev_suspend
  99  *  - pcmcia_socket_dev_resume
 100  * These functions check for the appropriate struct pcmcia_soket arrays,
 101  * and pass them to the low-level functions pcmcia_{suspend,resume}_socket
 102  */
 103 static int socket_resume(struct pcmcia_socket *skt);
 104 static int socket_suspend(struct pcmcia_socket *skt);
 105
 106 int pcmcia_socket_dev_suspend(struct device *dev, pm_message_t state)
 107 {
 108         struct pcmcia_socket *socket;
 109
 110         down_read(&pcmcia_socket_list_rwsem);
 111         list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
 112                 if (socket->dev.dev != dev)
 113                         continue;
 114                 down(&socket->skt_sem);
 115                 socket_suspend(socket);
 116                 up(&socket->skt_sem);
 117         }
 118         up_read(&pcmcia_socket_list_rwsem);
 119
 120         return 0;
 121 }
 122 EXPORT_SYMBOL(pcmcia_socket_dev_suspend);
 123
 124 int pcmcia_socket_dev_resume(struct device *dev)
 125 {
 126         struct pcmcia_socket *socket;
 127
 128         down_read(&pcmcia_socket_list_rwsem);
 129         list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
 130                 if (socket->dev.dev != dev)
 131                         continue;
 132                 down(&socket->skt_sem);
 133                 socket_resume(socket);
 134                 up(&socket->skt_sem);
 135         }
 136         up_read(&pcmcia_socket_list_rwsem);
 137
 138         return 0;
 139 }
 140 EXPORT_SYMBOL(pcmcia_socket_dev_resume);
 141
 142
 143 struct pcmcia_socket * pcmcia_get_socket(struct pcmcia_socket *skt)
 144 {
 145         struct class_device *cl_dev = class_device_get(&skt->dev);
 146         if (!cl_dev)
 147                 return NULL;
 148         skt = class_get_devdata(cl_dev);
 149         if (!try_module_get(skt->owner)) {
 150                 class_device_put(&skt->dev);
 151                 return NULL;
 152         }
 153         return (skt);
 154 }
 155 EXPORT_SYMBOL(pcmcia_get_socket);
 156
 157
 158 void pcmcia_put_socket(struct pcmcia_socket *skt)
 159 {
 160         module_put(skt->owner);
 161         class_device_put(&skt->dev);
 162 }
 163 EXPORT_SYMBOL(pcmcia_put_socket);
 164
 165
 166 static void pcmcia_release_socket(struct class_device *class_dev)
 167 {
 168         struct pcmcia_socket *socket = class_get_devdata(class_dev);
 169
 170         complete(&socket->socket_released);
 171 }
 172
 173 static int pccardd(void *__skt);
 174
 175 /**
 176  * pcmcia_register_socket - add a new pcmcia socket device
 177  */
 178 int pcmcia_register_socket(struct pcmcia_socket *socket)
 179 {
 180         int ret;
 181
 182         if (!socket || !socket->ops || !socket->dev.dev || !socket->resource_ops)
 183                 return -EINVAL;
 184
 185         cs_dbg(socket, 0, "pcmcia_register_socket(0x%p)\n", socket->ops);
 186
 187         spin_lock_init(&socket->lock);
 188
 189         if (socket->resource_ops->init) {
 190                 ret = socket->resource_ops->init(socket);
 191                 if (ret)
 192                         return (ret);
 193         }
 194
 195         /* try to obtain a socket number [yes, it gets ugly if we
 196          * register more than 2^sizeof(unsigned int) pcmcia
 197          * sockets... but the socket number is deprecated
 198          * anyways, so I don't care] */
 199         down_write(&pcmcia_socket_list_rwsem);
 200         if (list_empty(&pcmcia_socket_list))
 201                 socket->sock = 0;
 202         else {
 203                 unsigned int found, i = 1;
 204                 struct pcmcia_socket *tmp;
 205                 do {
 206                         found = 1;
 207                         list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
 208                                 if (tmp->sock == i)
 209                                         found = 0;
 210                         }
 211                         i++;
 212                 } while (!found);
 213                 socket->sock = i - 1;
 214         }
 215         list_add_tail(&socket->socket_list, &pcmcia_socket_list);
 216         up_write(&pcmcia_socket_list_rwsem);
 217
 218
 219         /* set proper values in socket->dev */
 220         socket->dev.class_data = socket;
 221         socket->dev.class = &pcmcia_socket_class;
 222         snprintf(socket->dev.class_id, BUS_ID_SIZE, "pcmcia_socket%u", socket->sock);
 223
 224         /* base address = 0, map = 0 */
 225         socket->cis_mem.flags = 0;
 226         socket->cis_mem.speed = cis_speed;
 227
 228         INIT_LIST_HEAD(&socket->cis_cache);
 229
 230         init_completion(&socket->socket_released);
 231         init_completion(&socket->thread_done);
 232         init_waitqueue_head(&socket->thread_wait);
 233         init_MUTEX(&socket->skt_sem);
 234         spin_lock_init(&socket->thread_lock);
 235
 236         ret = kernel_thread(pccardd, socket, CLONE_KERNEL);
 237         if (ret < 0)
 238                 goto err;
 239
 240         wait_for_completion(&socket->thread_done);
 241         if(!socket->thread) {
 242                 printk(KERN_WARNING "PCMCIA: warning: socket thread for socket %p did not start\n", socket);
 243                 return -EIO;
 244         }
 245         pcmcia_parse_events(socket, SS_DETECT);
 246
 247         return 0;
 248
 249  err:
 250         down_write(&pcmcia_socket_list_rwsem);
 251         list_del(&socket->socket_list);
 252         up_write(&pcmcia_socket_list_rwsem);
 253         return ret;
 254 } /* pcmcia_register_socket */
 255 EXPORT_SYMBOL(pcmcia_register_socket);
 256
 257
 258 /**
 259  * pcmcia_unregister_socket - remove a pcmcia socket device
 260  */
 261 void pcmcia_unregister_socket(struct pcmcia_socket *socket)
 262 {
 263         if (!socket)
 264                 return;
 265
 266         cs_dbg(socket, 0, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
 267
 268         if (socket->thread) {
 269                 init_completion(&socket->thread_done);
 270                 socket->thread = NULL;
 271                 wake_up(&socket->thread_wait);
 272                 wait_for_completion(&socket->thread_done);
 273         }
 274         release_cis_mem(socket);
 275
 276         /* remove from our own list */
 277         down_write(&pcmcia_socket_list_rwsem);
 278         list_del(&socket->socket_list);
 279         up_write(&pcmcia_socket_list_rwsem);
 280
 281         /* wait for sysfs to drop all references */
 282         release_resource_db(socket);
 283         wait_for_completion(&socket->socket_released);
 284 } /* pcmcia_unregister_socket */
 285 EXPORT_SYMBOL(pcmcia_unregister_socket);
 286
 287
 288 struct pcmcia_socket * pcmcia_get_socket_by_nr(unsigned int nr)
 289 {
 290         struct pcmcia_socket *s;
 291
 292         down_read(&pcmcia_socket_list_rwsem);
 293         list_for_each_entry(s, &pcmcia_socket_list, socket_list)
 294                 if (s->sock == nr) {
 295                         up_read(&pcmcia_socket_list_rwsem);
 296                         return s;
 297                 }
 298         up_read(&pcmcia_socket_list_rwsem);
 299
 300         return NULL;
 301
 302 }
 303 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
 304
 305
 306 /**
 307  * socket_setup() and shutdown_socket() are called by the main event
 308  * handler when card insertion and removal events are received.
 309  * socket_setup() turns on socket power and resets the socket, in two stages.
 310  * shutdown_socket() unconfigures a socket and turns off socket power.
 311  */
 312 static void shutdown_socket(struct pcmcia_socket *s)
 313 {
 314         cs_dbg(s, 1, "shutdown_socket\n");
 315
 316         /* Blank out the socket state */
 317         s->socket = dead_socket;
 318         s->ops->init(s);
 319         s->ops->set_socket(s, &s->socket);
 320         s->irq.AssignedIRQ = s->irq.Config = 0;
 321         s->lock_count = 0;
 322         destroy_cis_cache(s);
 323 #ifdef CONFIG_CARDBUS
 324         cb_free(s);
 325 #endif
 326         s->functions = 0;
 327         if (s->config) {
 328                 kfree(s->config);
 329                 s->config = NULL;
 330         }
 331
 332         {
 333                 int status;
 334                 s->ops->get_status(s, &status);
 335                 if (status & SS_POWERON) {
 336                         printk(KERN_ERR "PCMCIA: socket %p: *** DANGER *** unable to remove socket power\n", s);
 337                 }
 338         }
 339 } /* shutdown_socket */
 340
 341
 342 /**
 343  * The central event handler.  Send_event() sends an event to the
 344  * 16-bit subsystem, which then calls the relevant device drivers.
 345  * Parse_events() interprets the event bits from
 346  * a card status change report.  Do_shutdown() handles the high
 347  * priority stuff associated with a card removal.
 348  */
 349
 350 /* NOTE: send_event needs to be called with skt->sem held. */
 351
 352 static int send_event(struct pcmcia_socket *s, event_t event, int priority)
 353 {
 354         int ret;
 355
 356         if (s->state & SOCKET_CARDBUS)
 357                 return 0;
 358
 359         cs_dbg(s, 1, "send_event(event %d, pri %d, callback 0x%p)\n",
 360            event, priority, s->callback);
 361
 362         if (!s->callback)
 363                 return 0;
 364         if (!try_module_get(s->callback->owner))
 365                 return 0;
 366
 367         ret = s->callback->event(s, event, priority);
 368
 369         module_put(s->callback->owner);
 370
 371         return ret;
 372 }
 373
 374 static void socket_remove_drivers(struct pcmcia_socket *skt)
 375 {
 376         cs_dbg(skt, 4, "remove_drivers\n");
 377
 378         send_event(skt, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
 379 }
 380
 381 static void socket_shutdown(struct pcmcia_socket *skt)
 382 {
 383         cs_dbg(skt, 4, "shutdown\n");
 384
 385         socket_remove_drivers(skt);
 386         skt->state &= SOCKET_INUSE|SOCKET_PRESENT;
 387         msleep(shutdown_delay * 10);
 388         skt->state &= SOCKET_INUSE;
 389         shutdown_socket(skt);
 390 }
 391
 392 static int socket_reset(struct pcmcia_socket *skt)
 393 {
 394         int status, i;
 395
 396         cs_dbg(skt, 4, "reset\n");
 397
 398         skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
 399         skt->ops->set_socket(skt, &skt->socket);
 400         udelay((long)reset_time);
 401
 402         skt->socket.flags &= ~SS_RESET;
 403         skt->ops->set_socket(skt, &skt->socket);
 404
 405         msleep(unreset_delay * 10);
 406         for (i = 0; i < unreset_limit; i++) {
 407                 skt->ops->get_status(skt, &status);
 408
 409                 if (!(status & SS_DETECT))
 410                         return CS_NO_CARD;
 411
 412                 if (status & SS_READY)
 413                         return CS_SUCCESS;
 414
 415                 msleep(unreset_check * 10);
 416         }
 417
 418         cs_err(skt, "time out after reset.\n");
 419         return CS_GENERAL_FAILURE;
 420 }
 421
 422 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
 423 {
 424         int status, i;
 425
 426         cs_dbg(skt, 4, "setup\n");
 427
 428         skt->ops->get_status(skt, &status);
 429         if (!(status & SS_DETECT))
 430                 return CS_NO_CARD;
 431
 432         msleep(initial_delay * 10);
 433
 434         for (i = 0; i < 100; i++) {
 435                 skt->ops->get_status(skt, &status);
 436                 if (!(status & SS_DETECT))
 437                         return CS_NO_CARD;
 438
 439                 if (!(status & SS_PENDING))
 440                         break;
 441
 442                 msleep(100);
 443         }
 444
 445         if (status & SS_PENDING) {
 446                 cs_err(skt, "voltage interrogation timed out.\n");
 447                 return CS_GENERAL_FAILURE;
 448         }
 449
 450         if (status & SS_CARDBUS) {
 451                 skt->state |= SOCKET_CARDBUS;
 452 #ifndef CONFIG_CARDBUS
 453                 cs_err(skt, "cardbus cards are not supported.\n");
 454                 return CS_BAD_TYPE;
 455 #endif
 456         }
 457
 458         /*
 459          * Decode the card voltage requirements, and apply power to the card.
 460          */
 461         if (status & SS_3VCARD)
 462                 skt->socket.Vcc = skt->socket.Vpp = 33;
 463         else if (!(status & SS_XVCARD))
 464                 skt->socket.Vcc = skt->socket.Vpp = 50;
 465         else {
 466                 cs_err(skt, "unsupported voltage key.\n");
 467                 return CS_BAD_TYPE;
 468         }
 469
 470         if (skt->power_hook)
 471                 skt->power_hook(skt, HOOK_POWER_PRE);
 472
 473         skt->socket.flags = 0;
 474         skt->ops->set_socket(skt, &skt->socket);
 475
 476         /*
 477          * Wait "vcc_settle" for the supply to stabilise.
 478          */
 479         msleep(vcc_settle * 10);
 480
 481         skt->ops->get_status(skt, &status);
 482         if (!(status & SS_POWERON)) {
 483                 cs_err(skt, "unable to apply power.\n");
 484                 return CS_BAD_TYPE;
 485         }
 486
 487         status = socket_reset(skt);
 488
 489         if (skt->power_hook)
 490                 skt->power_hook(skt, HOOK_POWER_POST);
 491
 492         return status;
 493 }
 494
 495 /*
 496  * Handle card insertion.  Setup the socket, reset the card,
 497  * and then tell the rest of PCMCIA that a card is present.
 498  */
 499 static int socket_insert(struct pcmcia_socket *skt)
 500 {
 501         int ret;
 502
 503         cs_dbg(skt, 4, "insert\n");
 504
 505         if (!cs_socket_get(skt))
 506                 return CS_NO_CARD;
 507
 508         ret = socket_setup(skt, setup_delay);
 509         if (ret == CS_SUCCESS) {
 510                 skt->state |= SOCKET_PRESENT;
 511 #ifdef CONFIG_CARDBUS
 512                 if (skt->state & SOCKET_CARDBUS) {
 513                         cb_alloc(skt);
 514                         skt->state |= SOCKET_CARDBUS_CONFIG;
 515                 }
 516 #endif
 517                 cs_dbg(skt, 4, "insert done\n");
 518
 519                 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 520         } else {
 521                 socket_shutdown(skt);
 522                 cs_socket_put(skt);
 523         }
 524
 525         return ret;
 526 }
 527
 528 static int socket_suspend(struct pcmcia_socket *skt)
 529 {
 530         if (skt->state & SOCKET_SUSPEND)
 531                 return CS_IN_USE;
 532
 533         send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
 534         skt->socket = dead_socket;
 535         skt->ops->set_socket(skt, &skt->socket);
 536         if (skt->ops->suspend)
 537                 skt->ops->suspend(skt);
 538         skt->state |= SOCKET_SUSPEND;
 539
 540         return CS_SUCCESS;
 541 }
 542
 543 /*
 544  * Resume a socket.  If a card is present, verify its CIS against
 545  * our cached copy.  If they are different, the card has been
 546  * replaced, and we need to tell the drivers.
 547  */
 548 static int socket_resume(struct pcmcia_socket *skt)
 549 {
 550         int ret;
 551
 552         if (!(skt->state & SOCKET_SUSPEND))
 553                 return CS_IN_USE;
 554
 555         skt->socket = dead_socket;
 556         skt->ops->init(skt);
 557         skt->ops->set_socket(skt, &skt->socket);
 558
 559         if (!(skt->state & SOCKET_PRESENT)) {
 560                 skt->state &= ~SOCKET_SUSPEND;
 561                 return socket_insert(skt);
 562         }
 563
 564         ret = socket_setup(skt, resume_delay);
 565         if (ret == CS_SUCCESS) {
 566                 /*
 567                  * FIXME: need a better check here for cardbus cards.
 568                  */
 569                 if (verify_cis_cache(skt) != 0) {
 570                         cs_dbg(skt, 4, "cis mismatch - different card\n");
 571                         socket_remove_drivers(skt);
 572                         destroy_cis_cache(skt);
 573                         /*
 574                          * Workaround: give DS time to schedule removal.
 575                          * Remove me once the 100ms delay is eliminated
 576                          * in ds.c
 577                          */
 578                         msleep(200);
 579                         send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 580                 } else {
 581                         cs_dbg(skt, 4, "cis matches cache\n");
 582                         send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
 583                 }
 584         } else {
 585                 socket_shutdown(skt);
 586                 cs_socket_put(skt);
 587         }
 588
 589         skt->state &= ~SOCKET_SUSPEND;
 590
 591         return CS_SUCCESS;
 592 }
 593
 594 static void socket_remove(struct pcmcia_socket *skt)
 595 {
 596         socket_shutdown(skt);
 597         cs_socket_put(skt);
 598 }
 599
 600 /*
 601  * Process a socket card detect status change.
 602  *
 603  * If we don't have a card already present, delay the detect event for
 604  * about 20ms (to be on the safe side) before reading the socket status.
 605  *
 606  * Some i82365-based systems send multiple SS_DETECT events during card
 607  * insertion, and the "card present" status bit seems to bounce.  This
 608  * will probably be true with GPIO-based card detection systems after
 609  * the product has aged.
 610  */
 611 static void socket_detect_change(struct pcmcia_socket *skt)
 612 {
 613         if (!(skt->state & SOCKET_SUSPEND)) {
 614                 int status;
 615
 616                 if (!(skt->state & SOCKET_PRESENT))
 617                         msleep(20);
 618
 619                 skt->ops->get_status(skt, &status);
 620                 if ((skt->state & SOCKET_PRESENT) &&
 621                      !(status & SS_DETECT))
 622                         socket_remove(skt);
 623                 if (!(skt->state & SOCKET_PRESENT) &&
 624                     (status & SS_DETECT))
 625                         socket_insert(skt);
 626         }
 627 }
 628
 629 static int pccardd(void *__skt)
 630 {
 631         struct pcmcia_socket *skt = __skt;
 632         DECLARE_WAITQUEUE(wait, current);
 633         int ret;
 634
 635         daemonize("pccardd");
 636
 637         skt->thread = current;
 638         skt->socket = dead_socket;
 639         skt->ops->init(skt);
 640         skt->ops->set_socket(skt, &skt->socket);
 641
 642         /* register with the device core */
 643         ret = class_device_register(&skt->dev);
 644         if (ret) {
 645                 printk(KERN_WARNING "PCMCIA: unable to register socket 0x%p\n",
 646                         skt);
 647                 skt->thread = NULL;
 648                 complete_and_exit(&skt->thread_done, 0);
 649         }
 650         complete(&skt->thread_done);
 651
 652         add_wait_queue(&skt->thread_wait, &wait);
 653         for (;;) {
 654                 unsigned long flags;
 655                 unsigned int events;
 656
 657                 set_current_state(TASK_INTERRUPTIBLE);
 658
 659                 spin_lock_irqsave(&skt->thread_lock, flags);
 660                 events = skt->thread_events;
 661                 skt->thread_events = 0;
 662                 spin_unlock_irqrestore(&skt->thread_lock, flags);
 663
 664                 if (events) {
 665                         down(&skt->skt_sem);
 666                         if (events & SS_DETECT)
 667                                 socket_detect_change(skt);
 668                         if (events & SS_BATDEAD)
 669                                 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
 670                         if (events & SS_BATWARN)
 671                                 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
 672                         if (events & SS_READY)
 673                                 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
 674                         up(&skt->skt_sem);
 675                         continue;
 676                 }
 677
 678                 schedule();
 679                 try_to_freeze();
 680
 681                 if (!skt->thread)
 682                         break;
 683         }
 684         remove_wait_queue(&skt->thread_wait, &wait);
 685
 686         /* remove from the device core */
 687         class_device_unregister(&skt->dev);
 688
 689         complete_and_exit(&skt->thread_done, 0);
 690 }
 691
 692 /*
 693  * Yenta (at least) probes interrupts before registering the socket and
 694  * starting the handler thread.
 695  */
 696 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
 697 {
 698         cs_dbg(s, 4, "parse_events: events %08x\n", events);
 699         if (s->thread) {
 700                 spin_lock(&s->thread_lock);
 701                 s->thread_events |= events;
 702                 spin_unlock(&s->thread_lock);
 703
 704                 wake_up(&s->thread_wait);
 705         }
 706 } /* pcmcia_parse_events */
 707 EXPORT_SYMBOL(pcmcia_parse_events);
 708
 709
 710 /* register pcmcia_callback */
 711 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
 712 {
 713         int ret = 0;
 714
 715         /* s->skt_sem also protects s->callback */
 716         down(&s->skt_sem);
 717
 718         if (c) {
 719                 /* registration */
 720                 if (s->callback) {
 721                         ret = -EBUSY;
 722                         goto err;
 723                 }
 724
 725                 s->callback = c;
 726
 727                 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
 728                         send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
 729         } else
 730                 s->callback = NULL;
 731  err:
 732         up(&s->skt_sem);
 733
 734         return ret;
 735 }
 736 EXPORT_SYMBOL(pccard_register_pcmcia);
 737
 738
 739 /* I'm not sure which "reset" function this is supposed to use,
 740  * but for now, it uses the low-level interface's reset, not the
 741  * CIS register.
 742  */
 743
 744 int pccard_reset_card(struct pcmcia_socket *skt)
 745 {
 746         int ret;
 747
 748         cs_dbg(skt, 1, "resetting socket\n");
 749
 750         down(&skt->skt_sem);
 751         do {
 752                 if (!(skt->state & SOCKET_PRESENT)) {
 753                         ret = CS_NO_CARD;
 754                         break;
 755                 }
 756                 if (skt->state & SOCKET_SUSPEND) {
 757                         ret = CS_IN_USE;
 758                         break;
 759                 }
 760                 if (skt->state & SOCKET_CARDBUS) {
 761                         ret = CS_UNSUPPORTED_FUNCTION;
 762                         break;
 763                 }
 764
 765                 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW);
 766                 if (ret == 0) {
 767                         send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
 768                         if (socket_reset(skt) == CS_SUCCESS)
 769                                 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
 770                 }
 771
 772                 ret = CS_SUCCESS;
 773         } while (0);
 774         up(&skt->skt_sem);
 775
 776         return ret;
 777 } /* reset_card */
 778 EXPORT_SYMBOL(pccard_reset_card);
 779
 780
 781 /* These shut down or wake up a socket.  They are sort of user
 782  * initiated versions of the APM suspend and resume actions.
 783  */
 784 int pcmcia_suspend_card(struct pcmcia_socket *skt)
 785 {
 786         int ret;
 787
 788         cs_dbg(skt, 1, "suspending socket\n");
 789
 790         down(&skt->skt_sem);
 791         do {
 792                 if (!(skt->state & SOCKET_PRESENT)) {
 793                         ret = CS_NO_CARD;
 794                         break;
 795                 }
 796                 if (skt->state & SOCKET_CARDBUS) {
 797                         ret = CS_UNSUPPORTED_FUNCTION;
 798                         break;
 799                 }
 800                 ret = socket_suspend(skt);
 801         } while (0);
 802         up(&skt->skt_sem);
 803
 804         return ret;
 805 } /* suspend_card */
 806 EXPORT_SYMBOL(pcmcia_suspend_card);
 807
 808
 809 int pcmcia_resume_card(struct pcmcia_socket *skt)
 810 {
 811         int ret;
 812
 813         cs_dbg(skt, 1, "waking up socket\n");
 814
 815         down(&skt->skt_sem);
 816         do {
 817                 if (!(skt->state & SOCKET_PRESENT)) {
 818                         ret = CS_NO_CARD;
 819                         break;
 820                 }
 821                 if (skt->state & SOCKET_CARDBUS) {
 822                         ret = CS_UNSUPPORTED_FUNCTION;
 823                         break;
 824                 }
 825                 ret = socket_resume(skt);
 826         } while (0);
 827         up(&skt->skt_sem);
 828
 829         return ret;
 830 } /* resume_card */
 831 EXPORT_SYMBOL(pcmcia_resume_card);
 832
 833
 834 /* These handle user requests to eject or insert a card. */
 835 int pcmcia_eject_card(struct pcmcia_socket *skt)
 836 {
 837         int ret;
 838
 839         cs_dbg(skt, 1, "user eject request\n");
 840
 841         down(&skt->skt_sem);
 842         do {
 843                 if (!(skt->state & SOCKET_PRESENT)) {
 844                         ret = -ENODEV;
 845                         break;
 846                 }
 847
 848                 ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW);
 849                 if (ret != 0) {
 850                         ret = -EINVAL;
 851                         break;
 852                 }
 853
 854                 socket_remove(skt);
 855                 ret = 0;
 856         } while (0);
 857         up(&skt->skt_sem);
 858
 859         return ret;
 860 } /* eject_card */
 861 EXPORT_SYMBOL(pcmcia_eject_card);
 862
 863
 864 int pcmcia_insert_card(struct pcmcia_socket *skt)
 865 {
 866         int ret;
 867
 868         cs_dbg(skt, 1, "user insert request\n");
 869
 870         down(&skt->skt_sem);
 871         do {
 872                 if (skt->state & SOCKET_PRESENT) {
 873                         ret = -EBUSY;
 874                         break;
 875                 }
 876                 if (socket_insert(skt) == CS_NO_CARD) {
 877                         ret = -ENODEV;
 878                         break;
 879                 }
 880                 ret = 0;
 881         } while (0);
 882         up(&skt->skt_sem);
 883
 884         return ret;
 885 } /* insert_card */
 886 EXPORT_SYMBOL(pcmcia_insert_card);
 887
 888
 889 static int pcmcia_socket_hotplug(struct class_device *dev, char **envp,
 890                                 int num_envp, char *buffer, int buffer_size)
 891 {
 892         struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
 893         int i = 0, length = 0;
 894
 895         if (add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size,
 896                                 &length, "SOCKET_NO=%u", s->sock))
 897                 return -ENOMEM;
 898
 899         envp[i] = NULL;
 900
 901         return 0;
 902 }
 903
 904
 905 static struct completion pcmcia_unload;
 906
 907 static void pcmcia_release_socket_class(struct class *data)
 908 {
 909         complete(&pcmcia_unload);
 910 }
 911
 912
 913 struct class pcmcia_socket_class = {
 914         .name = "pcmcia_socket",
 915         .hotplug = pcmcia_socket_hotplug,
 916         .release = pcmcia_release_socket,
 917         .class_release = pcmcia_release_socket_class,
 918 };
 919 EXPORT_SYMBOL(pcmcia_socket_class);
 920
 921
 922 static int __init init_pcmcia_cs(void)
 923 {
 924         int ret;
 925
 926         init_completion(&pcmcia_unload);
 927         ret = class_register(&pcmcia_socket_class);
 928         if (ret)
 929                 return (ret);
 930         return class_interface_register(&pccard_sysfs_interface);
 931 }
 932
 933 static void __exit exit_pcmcia_cs(void)
 934 {
 935         class_interface_unregister(&pccard_sysfs_interface);
 936         class_unregister(&pcmcia_socket_class);
 937
 938         wait_for_completion(&pcmcia_unload);
 939 }
 940
 941 subsys_initcall(init_pcmcia_cs);
 942 module_exit(exit_pcmcia_cs);
 943