drivers/pcmcia/ds.c

   1 /*
   2  * ds.c -- 16-bit PCMCIA core support
   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  * (C) 2003 - 2006      Dominik Brodowski
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/errno.h>
  20 #include <linux/list.h>
  21 #include <linux/delay.h>
  22 #include <linux/workqueue.h>
  23 #include <linux/crc32.h>
  24 #include <linux/firmware.h>
  25 #include <linux/kref.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/slab.h>
  28
  29 #include <pcmcia/cs_types.h>
  30 #include <pcmcia/cs.h>
  31 #include <pcmcia/cistpl.h>
  32 #include <pcmcia/ds.h>
  33 #include <pcmcia/ss.h>
  34
  35 #include "cs_internal.h"
  36
  37 /*====================================================================*/
  38
  39 /* Module parameters */
  40
  41 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
  42 MODULE_DESCRIPTION("PCMCIA Driver Services");
  43 MODULE_LICENSE("GPL");
  44
  45
  46 /*====================================================================*/
  47
  48 static void pcmcia_check_driver(struct pcmcia_driver *p_drv)
  49 {
  50         struct pcmcia_device_id *did = p_drv->id_table;
  51         unsigned int i;
  52         u32 hash;
  53
  54         if (!p_drv->probe || !p_drv->remove)
  55                 printk(KERN_DEBUG "pcmcia: %s lacks a requisite callback "
  56                        "function\n", p_drv->drv.name);
  57
  58         while (did && did->match_flags) {
  59                 for (i = 0; i < 4; i++) {
  60                         if (!did->prod_id[i])
  61                                 continue;
  62
  63                         hash = crc32(0, did->prod_id[i], strlen(did->prod_id[i]));
  64                         if (hash == did->prod_id_hash[i])
  65                                 continue;
  66
  67                         printk(KERN_DEBUG "pcmcia: %s: invalid hash for "
  68                                "product string \"%s\": is 0x%x, should "
  69                                "be 0x%x\n", p_drv->drv.name, did->prod_id[i],
  70                                did->prod_id_hash[i], hash);
  71                         printk(KERN_DEBUG "pcmcia: see "
  72                                 "Documentation/pcmcia/devicetable.txt for "
  73                                 "details\n");
  74                 }
  75                 did++;
  76         }
  77
  78         return;
  79 }
  80
  81
  82 /*======================================================================*/
  83
  84
  85 struct pcmcia_dynid {
  86         struct list_head                node;
  87         struct pcmcia_device_id         id;
  88 };
  89
  90 /**
  91  * pcmcia_store_new_id - add a new PCMCIA device ID to this driver and re-probe devices
  92  * @driver: target device driver
  93  * @buf: buffer for scanning device ID data
  94  * @count: input size
  95  *
  96  * Adds a new dynamic PCMCIA device ID to this driver,
  97  * and causes the driver to probe for all devices again.
  98  */
  99 static ssize_t
 100 pcmcia_store_new_id(struct device_driver *driver, const char *buf, size_t count)
 101 {
 102         struct pcmcia_dynid *dynid;
 103         struct pcmcia_driver *pdrv = to_pcmcia_drv(driver);
 104         __u16 match_flags, manf_id, card_id;
 105         __u8 func_id, function, device_no;
 106         __u32 prod_id_hash[4] = {0, 0, 0, 0};
 107         int fields = 0;
 108         int retval = 0;
 109
 110         fields = sscanf(buf, "%hx %hx %hx %hhx %hhx %hhx %x %x %x %x",
 111                         &match_flags, &manf_id, &card_id, &func_id, &function, &device_no,
 112                         &prod_id_hash[0], &prod_id_hash[1], &prod_id_hash[2], &prod_id_hash[3]);
 113         if (fields < 6)
 114                 return -EINVAL;
 115
 116         dynid = kzalloc(sizeof(struct pcmcia_dynid), GFP_KERNEL);
 117         if (!dynid)
 118                 return -ENOMEM;
 119
 120         dynid->id.match_flags = match_flags;
 121         dynid->id.manf_id = manf_id;
 122         dynid->id.card_id = card_id;
 123         dynid->id.func_id = func_id;
 124         dynid->id.function = function;
 125         dynid->id.device_no = device_no;
 126         memcpy(dynid->id.prod_id_hash, prod_id_hash, sizeof(__u32) * 4);
 127
 128         mutex_lock(&pdrv->dynids.lock);
 129         list_add_tail(&dynid->node, &pdrv->dynids.list);
 130         mutex_unlock(&pdrv->dynids.lock);
 131
 132         if (get_driver(&pdrv->drv)) {
 133                 retval = driver_attach(&pdrv->drv);
 134                 put_driver(&pdrv->drv);
 135         }
 136
 137         if (retval)
 138                 return retval;
 139         return count;
 140 }
 141 static DRIVER_ATTR(new_id, S_IWUSR, NULL, pcmcia_store_new_id);
 142
 143 static void
 144 pcmcia_free_dynids(struct pcmcia_driver *drv)
 145 {
 146         struct pcmcia_dynid *dynid, *n;
 147
 148         mutex_lock(&drv->dynids.lock);
 149         list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
 150                 list_del(&dynid->node);
 151                 kfree(dynid);
 152         }
 153         mutex_unlock(&drv->dynids.lock);
 154 }
 155
 156 static int
 157 pcmcia_create_newid_file(struct pcmcia_driver *drv)
 158 {
 159         int error = 0;
 160         if (drv->probe != NULL)
 161                 error = driver_create_file(&drv->drv, &driver_attr_new_id);
 162         return error;
 163 }
 164
 165
 166 /**
 167  * pcmcia_register_driver - register a PCMCIA driver with the bus core
 168  * @driver: the &driver being registered
 169  *
 170  * Registers a PCMCIA driver with the PCMCIA bus core.
 171  */
 172 int pcmcia_register_driver(struct pcmcia_driver *driver)
 173 {
 174         int error;
 175
 176         if (!driver)
 177                 return -EINVAL;
 178
 179         pcmcia_check_driver(driver);
 180
 181         /* initialize common fields */
 182         driver->drv.bus = &pcmcia_bus_type;
 183         driver->drv.owner = driver->owner;
 184         mutex_init(&driver->dynids.lock);
 185         INIT_LIST_HEAD(&driver->dynids.list);
 186
 187         pr_debug("registering driver %s\n", driver->drv.name);
 188
 189         error = driver_register(&driver->drv);
 190         if (error < 0)
 191                 return error;
 192
 193         error = pcmcia_create_newid_file(driver);
 194         if (error)
 195                 driver_unregister(&driver->drv);
 196
 197         return error;
 198 }
 199 EXPORT_SYMBOL(pcmcia_register_driver);
 200
 201 /**
 202  * pcmcia_unregister_driver - unregister a PCMCIA driver with the bus core
 203  * @driver: the &driver being unregistered
 204  */
 205 void pcmcia_unregister_driver(struct pcmcia_driver *driver)
 206 {
 207         pr_debug("unregistering driver %s\n", driver->drv.name);
 208         driver_unregister(&driver->drv);
 209         pcmcia_free_dynids(driver);
 210 }
 211 EXPORT_SYMBOL(pcmcia_unregister_driver);
 212
 213
 214 /* pcmcia_device handling */
 215
 216 struct pcmcia_device *pcmcia_get_dev(struct pcmcia_device *p_dev)
 217 {
 218         struct device *tmp_dev;
 219         tmp_dev = get_device(&p_dev->dev);
 220         if (!tmp_dev)
 221                 return NULL;
 222         return to_pcmcia_dev(tmp_dev);
 223 }
 224
 225 void pcmcia_put_dev(struct pcmcia_device *p_dev)
 226 {
 227         if (p_dev)
 228                 put_device(&p_dev->dev);
 229 }
 230
 231 static void pcmcia_release_function(struct kref *ref)
 232 {
 233         struct config_t *c = container_of(ref, struct config_t, ref);
 234         pr_debug("releasing config_t\n");
 235         kfree(c);
 236 }
 237
 238 static void pcmcia_release_dev(struct device *dev)
 239 {
 240         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
 241         int i;
 242         dev_dbg(dev, "releasing device\n");
 243         pcmcia_put_socket(p_dev->socket);
 244         for (i = 0; i < 4; i++)
 245                 kfree(p_dev->prod_id[i]);
 246         kfree(p_dev->devname);
 247         kref_put(&p_dev->function_config->ref, pcmcia_release_function);
 248         kfree(p_dev);
 249 }
 250
 251
 252 static int pcmcia_device_probe(struct device *dev)
 253 {
 254         struct pcmcia_device *p_dev;
 255         struct pcmcia_driver *p_drv;
 256         struct pcmcia_socket *s;
 257         cistpl_config_t cis_config;
 258         int ret = 0;
 259
 260         dev = get_device(dev);
 261         if (!dev)
 262                 return -ENODEV;
 263
 264         p_dev = to_pcmcia_dev(dev);
 265         p_drv = to_pcmcia_drv(dev->driver);
 266         s = p_dev->socket;
 267
 268         dev_dbg(dev, "trying to bind to %s\n", p_drv->drv.name);
 269
 270         if ((!p_drv->probe) || (!p_dev->function_config) ||
 271             (!try_module_get(p_drv->owner))) {
 272                 ret = -EINVAL;
 273                 goto put_dev;
 274         }
 275
 276         /* set up some more device information */
 277         ret = pccard_read_tuple(p_dev->socket, p_dev->func, CISTPL_CONFIG,
 278                                 &cis_config);
 279         if (!ret) {
 280                 p_dev->conf.ConfigBase = cis_config.base;
 281                 p_dev->conf.Present = cis_config.rmask[0];
 282         } else {
 283                 dev_printk(KERN_INFO, dev,
 284                            "pcmcia: could not parse base and rmask0 of CIS\n");
 285                 p_dev->conf.ConfigBase = 0;
 286                 p_dev->conf.Present = 0;
 287         }
 288
 289         ret = p_drv->probe(p_dev);
 290         if (ret) {
 291                 dev_dbg(dev, "binding to %s failed with %d\n",
 292                            p_drv->drv.name, ret);
 293                 goto put_module;
 294         }
 295
 296         mutex_lock(&s->ops_mutex);
 297         if ((s->pcmcia_state.has_pfc) &&
 298             (p_dev->socket->device_count == 1) && (p_dev->device_no == 0))
 299                 pcmcia_parse_uevents(s, PCMCIA_UEVENT_REQUERY);
 300         mutex_unlock(&s->ops_mutex);
 301
 302 put_module:
 303         if (ret)
 304                 module_put(p_drv->owner);
 305 put_dev:
 306         if (ret)
 307                 put_device(dev);
 308         return ret;
 309 }
 310
 311
 312 /*
 313  * Removes a PCMCIA card from the device tree and socket list.
 314  */
 315 static void pcmcia_card_remove(struct pcmcia_socket *s, struct pcmcia_device *leftover)
 316 {
 317         struct pcmcia_device    *p_dev;
 318         struct pcmcia_device    *tmp;
 319
 320         dev_dbg(leftover ? &leftover->dev : &s->dev,
 321                    "pcmcia_card_remove(%d) %s\n", s->sock,
 322                    leftover ? leftover->devname : "");
 323
 324         mutex_lock(&s->ops_mutex);
 325         if (!leftover)
 326                 s->device_count = 0;
 327         else
 328                 s->device_count = 1;
 329         mutex_unlock(&s->ops_mutex);
 330
 331         /* unregister all pcmcia_devices registered with this socket, except leftover */
 332         list_for_each_entry_safe(p_dev, tmp, &s->devices_list, socket_device_list) {
 333                 if (p_dev == leftover)
 334                         continue;
 335
 336                 mutex_lock(&s->ops_mutex);
 337                 list_del(&p_dev->socket_device_list);
 338                 mutex_unlock(&s->ops_mutex);
 339
 340                 dev_dbg(&p_dev->dev, "unregistering device\n");
 341                 device_unregister(&p_dev->dev);
 342         }
 343
 344         return;
 345 }
 346
 347 static int pcmcia_device_remove(struct device *dev)
 348 {
 349         struct pcmcia_device *p_dev;
 350         struct pcmcia_driver *p_drv;
 351         int i;
 352
 353         p_dev = to_pcmcia_dev(dev);
 354         p_drv = to_pcmcia_drv(dev->driver);
 355
 356         dev_dbg(dev, "removing device\n");
 357
 358         /* If we're removing the primary module driving a
 359          * pseudo multi-function card, we need to unbind
 360          * all devices
 361          */
 362         if ((p_dev->socket->pcmcia_state.has_pfc) &&
 363             (p_dev->socket->device_count > 0) &&
 364             (p_dev->device_no == 0))
 365                 pcmcia_card_remove(p_dev->socket, p_dev);
 366
 367         /* detach the "instance" */
 368         if (!p_drv)
 369                 return 0;
 370
 371         if (p_drv->remove)
 372                 p_drv->remove(p_dev);
 373
 374         /* check for proper unloading */
 375         if (p_dev->_irq || p_dev->_io || p_dev->_locked)
 376                 dev_printk(KERN_INFO, dev,
 377                         "pcmcia: driver %s did not release config properly\n",
 378                         p_drv->drv.name);
 379
 380         for (i = 0; i < MAX_WIN; i++)
 381                 if (p_dev->_win & CLIENT_WIN_REQ(i))
 382                         dev_printk(KERN_INFO, dev,
 383                           "pcmcia: driver %s did not release window properly\n",
 384                            p_drv->drv.name);
 385
 386         /* references from pcmcia_probe_device */
 387         pcmcia_put_dev(p_dev);
 388         module_put(p_drv->owner);
 389
 390         return 0;
 391 }
 392
 393
 394 /*
 395  * pcmcia_device_query -- determine information about a pcmcia device
 396  */
 397 static int pcmcia_device_query(struct pcmcia_device *p_dev)
 398 {
 399         cistpl_manfid_t manf_id;
 400         cistpl_funcid_t func_id;
 401         cistpl_vers_1_t *vers1;
 402         unsigned int i;
 403
 404         vers1 = kmalloc(sizeof(*vers1), GFP_KERNEL);
 405         if (!vers1)
 406                 return -ENOMEM;
 407
 408         if (!pccard_read_tuple(p_dev->socket, BIND_FN_ALL,
 409                                CISTPL_MANFID, &manf_id)) {
 410                 mutex_lock(&p_dev->socket->ops_mutex);
 411                 p_dev->manf_id = manf_id.manf;
 412                 p_dev->card_id = manf_id.card;
 413                 p_dev->has_manf_id = 1;
 414                 p_dev->has_card_id = 1;
 415                 mutex_unlock(&p_dev->socket->ops_mutex);
 416         }
 417
 418         if (!pccard_read_tuple(p_dev->socket, p_dev->func,
 419                                CISTPL_FUNCID, &func_id)) {
 420                 mutex_lock(&p_dev->socket->ops_mutex);
 421                 p_dev->func_id = func_id.func;
 422                 p_dev->has_func_id = 1;
 423                 mutex_unlock(&p_dev->socket->ops_mutex);
 424         } else {
 425                 /* rule of thumb: cards with no FUNCID, but with
 426                  * common memory device geometry information, are
 427                  * probably memory cards (from pcmcia-cs) */
 428                 cistpl_device_geo_t *devgeo;
 429
 430                 devgeo = kmalloc(sizeof(*devgeo), GFP_KERNEL);
 431                 if (!devgeo) {
 432                         kfree(vers1);
 433                         return -ENOMEM;
 434                 }
 435                 if (!pccard_read_tuple(p_dev->socket, p_dev->func,
 436                                       CISTPL_DEVICE_GEO, devgeo)) {
 437                         dev_dbg(&p_dev->dev,
 438                                    "mem device geometry probably means "
 439                                    "FUNCID_MEMORY\n");
 440                         mutex_lock(&p_dev->socket->ops_mutex);
 441                         p_dev->func_id = CISTPL_FUNCID_MEMORY;
 442                         p_dev->has_func_id = 1;
 443                         mutex_unlock(&p_dev->socket->ops_mutex);
 444                 }
 445                 kfree(devgeo);
 446         }
 447
 448         if (!pccard_read_tuple(p_dev->socket, BIND_FN_ALL, CISTPL_VERS_1,
 449                                vers1)) {
 450                 mutex_lock(&p_dev->socket->ops_mutex);
 451                 for (i = 0; i < min_t(unsigned int, 4, vers1->ns); i++) {
 452                         char *tmp;
 453                         unsigned int length;
 454                         char *new;
 455
 456                         tmp = vers1->str + vers1->ofs[i];
 457
 458                         length = strlen(tmp) + 1;
 459                         if ((length < 2) || (length > 255))
 460                                 continue;
 461
 462                         new = kmalloc(sizeof(char) * length, GFP_KERNEL);
 463                         if (!new)
 464                                 continue;
 465
 466                         new = strncpy(new, tmp, length);
 467
 468                         tmp = p_dev->prod_id[i];
 469                         p_dev->prod_id[i] = new;
 470                         kfree(tmp);
 471                 }
 472                 mutex_unlock(&p_dev->socket->ops_mutex);
 473         }
 474
 475         kfree(vers1);
 476         return 0;
 477 }
 478
 479
 480 struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s, unsigned int function)
 481 {
 482         struct pcmcia_device *p_dev, *tmp_dev;
 483         int i;
 484
 485         s = pcmcia_get_socket(s);
 486         if (!s)
 487                 return NULL;
 488
 489         pr_debug("adding device to %d, function %d\n", s->sock, function);
 490
 491         p_dev = kzalloc(sizeof(struct pcmcia_device), GFP_KERNEL);
 492         if (!p_dev)
 493                 goto err_put;
 494
 495         mutex_lock(&s->ops_mutex);
 496         p_dev->device_no = (s->device_count++);
 497         mutex_unlock(&s->ops_mutex);
 498
 499         /* max of 2 PFC devices */
 500         if ((p_dev->device_no >= 2) && (function == 0))
 501                 goto err_free;
 502
 503         /* max of 4 devices overall */
 504         if (p_dev->device_no >= 4)
 505                 goto err_free;
 506
 507         p_dev->socket = s;
 508         p_dev->func   = function;
 509
 510         p_dev->dev.bus = &pcmcia_bus_type;
 511         p_dev->dev.parent = s->dev.parent;
 512         p_dev->dev.release = pcmcia_release_dev;
 513         /* by default don't allow DMA */
 514         p_dev->dma_mask = DMA_MASK_NONE;
 515         p_dev->dev.dma_mask = &p_dev->dma_mask;
 516         dev_set_name(&p_dev->dev, "%d.%d", p_dev->socket->sock, p_dev->device_no);
 517         if (!dev_name(&p_dev->dev))
 518                 goto err_free;
 519         p_dev->devname = kasprintf(GFP_KERNEL, "pcmcia%s", dev_name(&p_dev->dev));
 520         if (!p_dev->devname)
 521                 goto err_free;
 522         dev_dbg(&p_dev->dev, "devname is %s\n", p_dev->devname);
 523
 524         mutex_lock(&s->ops_mutex);
 525
 526         /*
 527          * p_dev->function_config must be the same for all card functions.
 528          * Note that this is serialized by ops_mutex, so that only one
 529          * such struct will be created.
 530          */
 531         list_for_each_entry(tmp_dev, &s->devices_list, socket_device_list)
 532                 if (p_dev->func == tmp_dev->func) {
 533                         p_dev->function_config = tmp_dev->function_config;
 534                         p_dev->io = tmp_dev->io;
 535                         p_dev->irq = tmp_dev->irq;
 536                         kref_get(&p_dev->function_config->ref);
 537                 }
 538
 539         /* Add to the list in pcmcia_bus_socket */
 540         list_add(&p_dev->socket_device_list, &s->devices_list);
 541
 542         if (pcmcia_setup_irq(p_dev))
 543                 dev_warn(&p_dev->dev,
 544                         "IRQ setup failed -- device might not work\n");
 545
 546         if (!p_dev->function_config) {
 547                 dev_dbg(&p_dev->dev, "creating config_t\n");
 548                 p_dev->function_config = kzalloc(sizeof(struct config_t),
 549                                                  GFP_KERNEL);
 550                 if (!p_dev->function_config) {
 551                         mutex_unlock(&s->ops_mutex);
 552                         goto err_unreg;
 553                 }
 554                 kref_init(&p_dev->function_config->ref);
 555         }
 556         mutex_unlock(&s->ops_mutex);
 557
 558         dev_printk(KERN_NOTICE, &p_dev->dev,
 559                    "pcmcia: registering new device %s (IRQ: %d)\n",
 560                    p_dev->devname, p_dev->irq);
 561
 562         pcmcia_device_query(p_dev);
 563
 564         if (device_register(&p_dev->dev))
 565                 goto err_unreg;
 566
 567         return p_dev;
 568
 569  err_unreg:
 570         mutex_lock(&s->ops_mutex);
 571         list_del(&p_dev->socket_device_list);
 572         mutex_unlock(&s->ops_mutex);
 573
 574  err_free:
 575         mutex_lock(&s->ops_mutex);
 576         s->device_count--;
 577         mutex_unlock(&s->ops_mutex);
 578
 579         for (i = 0; i < 4; i++)
 580                 kfree(p_dev->prod_id[i]);
 581         kfree(p_dev->devname);
 582         kfree(p_dev);
 583  err_put:
 584         pcmcia_put_socket(s);
 585
 586         return NULL;
 587 }
 588
 589
 590 static int pcmcia_card_add(struct pcmcia_socket *s)
 591 {
 592         cistpl_longlink_mfc_t mfc;
 593         unsigned int no_funcs, i, no_chains;
 594         int ret = -EAGAIN;
 595
 596         mutex_lock(&s->ops_mutex);
 597         if (!(s->resource_setup_done)) {
 598                 dev_dbg(&s->dev,
 599                            "no resources available, delaying card_add\n");
 600                 mutex_unlock(&s->ops_mutex);
 601                 return -EAGAIN; /* try again, but later... */
 602         }
 603
 604         if (pcmcia_validate_mem(s)) {
 605                 dev_dbg(&s->dev, "validating mem resources failed, "
 606                        "delaying card_add\n");
 607                 mutex_unlock(&s->ops_mutex);
 608                 return -EAGAIN; /* try again, but later... */
 609         }
 610         mutex_unlock(&s->ops_mutex);
 611
 612         ret = pccard_validate_cis(s, &no_chains);
 613         if (ret || !no_chains) {
 614                 dev_dbg(&s->dev, "invalid CIS or invalid resources\n");
 615                 return -ENODEV;
 616         }
 617
 618         if (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_LONGLINK_MFC, &mfc))
 619                 no_funcs = mfc.nfn;
 620         else
 621                 no_funcs = 1;
 622         s->functions = no_funcs;
 623
 624         for (i = 0; i < no_funcs; i++)
 625                 pcmcia_device_add(s, i);
 626
 627         return ret;
 628 }
 629
 630
 631 static int pcmcia_requery_callback(struct device *dev, void * _data)
 632 {
 633         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
 634         if (!p_dev->dev.driver) {
 635                 dev_dbg(dev, "update device information\n");
 636                 pcmcia_device_query(p_dev);
 637         }
 638
 639         return 0;
 640 }
 641
 642
 643 static void pcmcia_requery(struct pcmcia_socket *s)
 644 {
 645         int has_pfc;
 646
 647         if (s->functions == 0) {
 648                 pcmcia_card_add(s);
 649                 return;
 650         }
 651
 652         /* some device information might have changed because of a CIS
 653          * update or because we can finally read it correctly... so
 654          * determine it again, overwriting old values if necessary. */
 655         bus_for_each_dev(&pcmcia_bus_type, NULL, NULL, pcmcia_requery_callback);
 656
 657         /* if the CIS changed, we need to check whether the number of
 658          * functions changed. */
 659         if (s->fake_cis) {
 660                 int old_funcs, new_funcs;
 661                 cistpl_longlink_mfc_t mfc;
 662
 663                 /* does this cis override add or remove functions? */
 664                 old_funcs = s->functions;
 665
 666                 if (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_LONGLINK_MFC,
 667                                         &mfc))
 668                         new_funcs = mfc.nfn;
 669                 else
 670                         new_funcs = 1;
 671                 if (old_funcs != new_funcs) {
 672                         /* we need to re-start */
 673                         pcmcia_card_remove(s, NULL);
 674                         pcmcia_card_add(s);
 675                 }
 676         }
 677
 678         /* If the PCMCIA device consists of two pseudo devices,
 679          * call pcmcia_device_add() -- which will fail if both
 680          * devices are already registered. */
 681         mutex_lock(&s->ops_mutex);
 682         has_pfc = s->pcmcia_state.has_pfc;
 683         mutex_unlock(&s->ops_mutex);
 684         if (has_pfc)
 685                 pcmcia_device_add(s, 0);
 686
 687         /* we re-scan all devices, not just the ones connected to this
 688          * socket. This does not matter, though. */
 689         if (bus_rescan_devices(&pcmcia_bus_type))
 690                 dev_warn(&s->dev, "rescanning the bus failed\n");
 691 }
 692
 693
 694 #ifdef CONFIG_PCMCIA_LOAD_CIS
 695
 696 /**
 697  * pcmcia_load_firmware - load CIS from userspace if device-provided is broken
 698  * @dev: the pcmcia device which needs a CIS override
 699  * @filename: requested filename in /lib/firmware/
 700  *
 701  * This uses the in-kernel firmware loading mechanism to use a "fake CIS" if
 702  * the one provided by the card is broken. The firmware files reside in
 703  * /lib/firmware/ in userspace.
 704  */
 705 static int pcmcia_load_firmware(struct pcmcia_device *dev, char * filename)
 706 {
 707         struct pcmcia_socket *s = dev->socket;
 708         const struct firmware *fw;
 709         int ret = -ENOMEM;
 710         cistpl_longlink_mfc_t mfc;
 711         int old_funcs, new_funcs = 1;
 712
 713         if (!filename)
 714                 return -EINVAL;
 715
 716         dev_dbg(&dev->dev, "trying to load CIS file %s\n", filename);
 717
 718         if (request_firmware(&fw, filename, &dev->dev) == 0) {
 719                 if (fw->size >= CISTPL_MAX_CIS_SIZE) {
 720                         ret = -EINVAL;
 721                         dev_printk(KERN_ERR, &dev->dev,
 722                                    "pcmcia: CIS override is too big\n");
 723                         goto release;
 724                 }
 725
 726                 if (!pcmcia_replace_cis(s, fw->data, fw->size))
 727                         ret = 0;
 728                 else {
 729                         dev_printk(KERN_ERR, &dev->dev,
 730                                    "pcmcia: CIS override failed\n");
 731                         goto release;
 732                 }
 733
 734                 /* we need to re-start if the number of functions changed */
 735                 old_funcs = s->functions;
 736                 if (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_LONGLINK_MFC,
 737                                         &mfc))
 738                         new_funcs = mfc.nfn;
 739
 740                 if (old_funcs != new_funcs)
 741                         ret = -EBUSY;
 742
 743                 /* update information */
 744                 pcmcia_device_query(dev);
 745
 746                 /* requery (as number of functions might have changed) */
 747                 pcmcia_parse_uevents(s, PCMCIA_UEVENT_REQUERY);
 748         }
 749  release:
 750         release_firmware(fw);
 751
 752         return ret;
 753 }
 754
 755 #else /* !CONFIG_PCMCIA_LOAD_CIS */
 756
 757 static inline int pcmcia_load_firmware(struct pcmcia_device *dev, char * filename)
 758 {
 759         return -ENODEV;
 760 }
 761
 762 #endif
 763
 764
 765 static inline int pcmcia_devmatch(struct pcmcia_device *dev,
 766                                   struct pcmcia_device_id *did)
 767 {
 768         if (did->match_flags & PCMCIA_DEV_ID_MATCH_MANF_ID) {
 769                 if ((!dev->has_manf_id) || (dev->manf_id != did->manf_id))
 770                         return 0;
 771         }
 772
 773         if (did->match_flags & PCMCIA_DEV_ID_MATCH_CARD_ID) {
 774                 if ((!dev->has_card_id) || (dev->card_id != did->card_id))
 775                         return 0;
 776         }
 777
 778         if (did->match_flags & PCMCIA_DEV_ID_MATCH_FUNCTION) {
 779                 if (dev->func != did->function)
 780                         return 0;
 781         }
 782
 783         if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID1) {
 784                 if (!dev->prod_id[0])
 785                         return 0;
 786                 if (strcmp(did->prod_id[0], dev->prod_id[0]))
 787                         return 0;
 788         }
 789
 790         if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID2) {
 791                 if (!dev->prod_id[1])
 792                         return 0;
 793                 if (strcmp(did->prod_id[1], dev->prod_id[1]))
 794                         return 0;
 795         }
 796
 797         if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID3) {
 798                 if (!dev->prod_id[2])
 799                         return 0;
 800                 if (strcmp(did->prod_id[2], dev->prod_id[2]))
 801                         return 0;
 802         }
 803
 804         if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID4) {
 805                 if (!dev->prod_id[3])
 806                         return 0;
 807                 if (strcmp(did->prod_id[3], dev->prod_id[3]))
 808                         return 0;
 809         }
 810
 811         if (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO) {
 812                 dev_dbg(&dev->dev, "this is a pseudo-multi-function device\n");
 813                 mutex_lock(&dev->socket->ops_mutex);
 814                 dev->socket->pcmcia_state.has_pfc = 1;
 815                 mutex_unlock(&dev->socket->ops_mutex);
 816                 if (dev->device_no != did->device_no)
 817                         return 0;
 818         }
 819
 820         if (did->match_flags & PCMCIA_DEV_ID_MATCH_FUNC_ID) {
 821                 int ret;
 822
 823                 if ((!dev->has_func_id) || (dev->func_id != did->func_id))
 824                         return 0;
 825
 826                 /* if this is a pseudo-multi-function device,
 827                  * we need explicit matches */
 828                 if (dev->socket->pcmcia_state.has_pfc)
 829                         return 0;
 830                 if (dev->device_no)
 831                         return 0;
 832
 833                 /* also, FUNC_ID matching needs to be activated by userspace
 834                  * after it has re-checked that there is no possible module
 835                  * with a prod_id/manf_id/card_id match.
 836                  */
 837                 mutex_lock(&dev->socket->ops_mutex);
 838                 ret = dev->allow_func_id_match;
 839                 mutex_unlock(&dev->socket->ops_mutex);
 840
 841                 if (!ret) {
 842                         dev_dbg(&dev->dev,
 843                                 "skipping FUNC_ID match until userspace ACK\n");
 844                         return 0;
 845                 }
 846         }
 847
 848         if (did->match_flags & PCMCIA_DEV_ID_MATCH_FAKE_CIS) {
 849                 dev_dbg(&dev->dev, "device needs a fake CIS\n");
 850                 if (!dev->socket->fake_cis)
 851                         if (pcmcia_load_firmware(dev, did->cisfile))
 852                                 return 0;
 853         }
 854
 855         if (did->match_flags & PCMCIA_DEV_ID_MATCH_ANONYMOUS) {
 856                 int i;
 857                 for (i = 0; i < 4; i++)
 858                         if (dev->prod_id[i])
 859                                 return 0;
 860                 if (dev->has_manf_id || dev->has_card_id || dev->has_func_id)
 861                         return 0;
 862         }
 863
 864         return 1;
 865 }
 866
 867
 868 static int pcmcia_bus_match(struct device *dev, struct device_driver *drv)
 869 {
 870         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
 871         struct pcmcia_driver *p_drv = to_pcmcia_drv(drv);
 872         struct pcmcia_device_id *did = p_drv->id_table;
 873         struct pcmcia_dynid *dynid;
 874
 875         /* match dynamic devices first */
 876         mutex_lock(&p_drv->dynids.lock);
 877         list_for_each_entry(dynid, &p_drv->dynids.list, node) {
 878                 dev_dbg(dev, "trying to match to %s\n", drv->name);
 879                 if (pcmcia_devmatch(p_dev, &dynid->id)) {
 880                         dev_dbg(dev, "matched to %s\n", drv->name);
 881                         mutex_unlock(&p_drv->dynids.lock);
 882                         return 1;
 883                 }
 884         }
 885         mutex_unlock(&p_drv->dynids.lock);
 886
 887 #ifdef CONFIG_PCMCIA_IOCTL
 888         /* matching by cardmgr */
 889         if (p_dev->cardmgr == p_drv) {
 890                 dev_dbg(dev, "cardmgr matched to %s\n", drv->name);
 891                 return 1;
 892         }
 893 #endif
 894
 895         while (did && did->match_flags) {
 896                 dev_dbg(dev, "trying to match to %s\n", drv->name);
 897                 if (pcmcia_devmatch(p_dev, did)) {
 898                         dev_dbg(dev, "matched to %s\n", drv->name);
 899                         return 1;
 900                 }
 901                 did++;
 902         }
 903
 904         return 0;
 905 }
 906
 907 #ifdef CONFIG_HOTPLUG
 908
 909 static int pcmcia_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 910 {
 911         struct pcmcia_device *p_dev;
 912         int i;
 913         u32 hash[4] = { 0, 0, 0, 0};
 914
 915         if (!dev)
 916                 return -ENODEV;
 917
 918         p_dev = to_pcmcia_dev(dev);
 919
 920         /* calculate hashes */
 921         for (i = 0; i < 4; i++) {
 922                 if (!p_dev->prod_id[i])
 923                         continue;
 924                 hash[i] = crc32(0, p_dev->prod_id[i], strlen(p_dev->prod_id[i]));
 925         }
 926
 927         if (add_uevent_var(env, "SOCKET_NO=%u", p_dev->socket->sock))
 928                 return -ENOMEM;
 929
 930         if (add_uevent_var(env, "DEVICE_NO=%02X", p_dev->device_no))
 931                 return -ENOMEM;
 932
 933         if (add_uevent_var(env, "MODALIAS=pcmcia:m%04Xc%04Xf%02Xfn%02Xpfn%02X"
 934                            "pa%08Xpb%08Xpc%08Xpd%08X",
 935                            p_dev->has_manf_id ? p_dev->manf_id : 0,
 936                            p_dev->has_card_id ? p_dev->card_id : 0,
 937                            p_dev->has_func_id ? p_dev->func_id : 0,
 938                            p_dev->func,
 939                            p_dev->device_no,
 940                            hash[0],
 941                            hash[1],
 942                            hash[2],
 943                            hash[3]))
 944                 return -ENOMEM;
 945
 946         return 0;
 947 }
 948
 949 #else
 950
 951 static int pcmcia_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 952 {
 953         return -ENODEV;
 954 }
 955
 956 #endif
 957
 958 /************************ runtime PM support ***************************/
 959
 960 static int pcmcia_dev_suspend(struct device *dev, pm_message_t state);
 961 static int pcmcia_dev_resume(struct device *dev);
 962
 963 static int runtime_suspend(struct device *dev)
 964 {
 965         int rc;
 966
 967         device_lock(dev);
 968         rc = pcmcia_dev_suspend(dev, PMSG_SUSPEND);
 969         device_unlock(dev);
 970         return rc;
 971 }
 972
 973 static int runtime_resume(struct device *dev)
 974 {
 975         int rc;
 976
 977         device_lock(dev);
 978         rc = pcmcia_dev_resume(dev);
 979         device_unlock(dev);
 980         return rc;
 981 }
 982
 983 /************************ per-device sysfs output ***************************/
 984
 985 #define pcmcia_device_attr(field, test, format)                         \
 986 static ssize_t field##_show (struct device *dev, struct device_attribute *attr, char *buf)              \
 987 {                                                                       \
 988         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);               \
 989         return p_dev->test ? sprintf(buf, format, p_dev->field) : -ENODEV; \
 990 }
 991
 992 #define pcmcia_device_stringattr(name, field)                                   \
 993 static ssize_t name##_show (struct device *dev, struct device_attribute *attr, char *buf)               \
 994 {                                                                       \
 995         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);               \
 996         return p_dev->field ? sprintf(buf, "%s\n", p_dev->field) : -ENODEV; \
 997 }
 998
 999 pcmcia_device_attr(func, socket, "0x%02x\n");
1000 pcmcia_device_attr(func_id, has_func_id, "0x%02x\n");
1001 pcmcia_device_attr(manf_id, has_manf_id, "0x%04x\n");
1002 pcmcia_device_attr(card_id, has_card_id, "0x%04x\n");
1003 pcmcia_device_stringattr(prod_id1, prod_id[0]);
1004 pcmcia_device_stringattr(prod_id2, prod_id[1]);
1005 pcmcia_device_stringattr(prod_id3, prod_id[2]);
1006 pcmcia_device_stringattr(prod_id4, prod_id[3]);
1007
1008
1009 static ssize_t pcmcia_show_pm_state(struct device *dev, struct device_attribute *attr, char *buf)
1010 {
1011         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1012
1013         if (p_dev->suspended)
1014                 return sprintf(buf, "off\n");
1015         else
1016                 return sprintf(buf, "on\n");
1017 }
1018
1019 static ssize_t pcmcia_store_pm_state(struct device *dev, struct device_attribute *attr,
1020                                      const char *buf, size_t count)
1021 {
1022         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1023         int ret = 0;
1024
1025         if (!count)
1026                 return -EINVAL;
1027
1028         if ((!p_dev->suspended) && !strncmp(buf, "off", 3))
1029                 ret = runtime_suspend(dev);
1030         else if (p_dev->suspended && !strncmp(buf, "on", 2))
1031                 ret = runtime_resume(dev);
1032
1033         return ret ? ret : count;
1034 }
1035
1036
1037 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1038 {
1039         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1040         int i;
1041         u32 hash[4] = { 0, 0, 0, 0};
1042
1043         /* calculate hashes */
1044         for (i = 0; i < 4; i++) {
1045                 if (!p_dev->prod_id[i])
1046                         continue;
1047                 hash[i] = crc32(0, p_dev->prod_id[i],
1048                                 strlen(p_dev->prod_id[i]));
1049         }
1050         return sprintf(buf, "pcmcia:m%04Xc%04Xf%02Xfn%02Xpfn%02X"
1051                                 "pa%08Xpb%08Xpc%08Xpd%08X\n",
1052                                 p_dev->has_manf_id ? p_dev->manf_id : 0,
1053                                 p_dev->has_card_id ? p_dev->card_id : 0,
1054                                 p_dev->has_func_id ? p_dev->func_id : 0,
1055                                 p_dev->func, p_dev->device_no,
1056                                 hash[0], hash[1], hash[2], hash[3]);
1057 }
1058
1059 static ssize_t pcmcia_store_allow_func_id_match(struct device *dev,
1060                 struct device_attribute *attr, const char *buf, size_t count)
1061 {
1062         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1063
1064         if (!count)
1065                 return -EINVAL;
1066
1067         mutex_lock(&p_dev->socket->ops_mutex);
1068         p_dev->allow_func_id_match = 1;
1069         mutex_unlock(&p_dev->socket->ops_mutex);
1070         pcmcia_parse_uevents(p_dev->socket, PCMCIA_UEVENT_REQUERY);
1071
1072         return count;
1073 }
1074
1075 static struct device_attribute pcmcia_dev_attrs[] = {
1076         __ATTR(function, 0444, func_show, NULL),
1077         __ATTR(pm_state, 0644, pcmcia_show_pm_state, pcmcia_store_pm_state),
1078         __ATTR_RO(func_id),
1079         __ATTR_RO(manf_id),
1080         __ATTR_RO(card_id),
1081         __ATTR_RO(prod_id1),
1082         __ATTR_RO(prod_id2),
1083         __ATTR_RO(prod_id3),
1084         __ATTR_RO(prod_id4),
1085         __ATTR_RO(modalias),
1086         __ATTR(allow_func_id_match, 0200, NULL, pcmcia_store_allow_func_id_match),
1087         __ATTR_NULL,
1088 };
1089
1090 /* PM support, also needed for reset */
1091
1092 static int pcmcia_dev_suspend(struct device *dev, pm_message_t state)
1093 {
1094         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1095         struct pcmcia_driver *p_drv = NULL;
1096         int ret = 0;
1097
1098         mutex_lock(&p_dev->socket->ops_mutex);
1099         if (p_dev->suspended) {
1100                 mutex_unlock(&p_dev->socket->ops_mutex);
1101                 return 0;
1102         }
1103         p_dev->suspended = 1;
1104         mutex_unlock(&p_dev->socket->ops_mutex);
1105
1106         dev_dbg(dev, "suspending\n");
1107
1108         if (dev->driver)
1109                 p_drv = to_pcmcia_drv(dev->driver);
1110
1111         if (!p_drv)
1112                 goto out;
1113
1114         if (p_drv->suspend) {
1115                 ret = p_drv->suspend(p_dev);
1116                 if (ret) {
1117                         dev_printk(KERN_ERR, dev,
1118                                    "pcmcia: device %s (driver %s) did "
1119                                    "not want to go to sleep (%d)\n",
1120                                    p_dev->devname, p_drv->drv.name, ret);
1121                         mutex_lock(&p_dev->socket->ops_mutex);
1122                         p_dev->suspended = 0;
1123                         mutex_unlock(&p_dev->socket->ops_mutex);
1124                         goto out;
1125                 }
1126         }
1127
1128         if (p_dev->device_no == p_dev->func) {
1129                 dev_dbg(dev, "releasing configuration\n");
1130                 pcmcia_release_configuration(p_dev);
1131         }
1132
1133  out:
1134         return ret;
1135 }
1136
1137
1138 static int pcmcia_dev_resume(struct device *dev)
1139 {
1140         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1141         struct pcmcia_driver *p_drv = NULL;
1142         int ret = 0;
1143
1144         mutex_lock(&p_dev->socket->ops_mutex);
1145         if (!p_dev->suspended) {
1146                 mutex_unlock(&p_dev->socket->ops_mutex);
1147                 return 0;
1148         }
1149         p_dev->suspended = 0;
1150         mutex_unlock(&p_dev->socket->ops_mutex);
1151
1152         dev_dbg(dev, "resuming\n");
1153
1154         if (dev->driver)
1155                 p_drv = to_pcmcia_drv(dev->driver);
1156
1157         if (!p_drv)
1158                 goto out;
1159
1160         if (p_dev->device_no == p_dev->func) {
1161                 dev_dbg(dev, "requesting configuration\n");
1162                 ret = pcmcia_request_configuration(p_dev, &p_dev->conf);
1163                 if (ret)
1164                         goto out;
1165         }
1166
1167         if (p_drv->resume)
1168                 ret = p_drv->resume(p_dev);
1169
1170  out:
1171         return ret;
1172 }
1173
1174
1175 static int pcmcia_bus_suspend_callback(struct device *dev, void * _data)
1176 {
1177         struct pcmcia_socket *skt = _data;
1178         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1179
1180         if (p_dev->socket != skt || p_dev->suspended)
1181                 return 0;
1182
1183         return runtime_suspend(dev);
1184 }
1185
1186 static int pcmcia_bus_resume_callback(struct device *dev, void * _data)
1187 {
1188         struct pcmcia_socket *skt = _data;
1189         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1190
1191         if (p_dev->socket != skt || !p_dev->suspended)
1192                 return 0;
1193
1194         runtime_resume(dev);
1195
1196         return 0;
1197 }
1198
1199 static int pcmcia_bus_resume(struct pcmcia_socket *skt)
1200 {
1201         dev_dbg(&skt->dev, "resuming socket %d\n", skt->sock);
1202         bus_for_each_dev(&pcmcia_bus_type, NULL, skt, pcmcia_bus_resume_callback);
1203         return 0;
1204 }
1205
1206 static int pcmcia_bus_suspend(struct pcmcia_socket *skt)
1207 {
1208         dev_dbg(&skt->dev, "suspending socket %d\n", skt->sock);
1209         if (bus_for_each_dev(&pcmcia_bus_type, NULL, skt,
1210                              pcmcia_bus_suspend_callback)) {
1211                 pcmcia_bus_resume(skt);
1212                 return -EIO;
1213         }
1214         return 0;
1215 }
1216
1217
1218 /*======================================================================
1219
1220     The card status event handler.
1221
1222 ======================================================================*/
1223
1224 /* Normally, the event is passed to individual drivers after
1225  * informing userspace. Only for CS_EVENT_CARD_REMOVAL this
1226  * is inversed to maintain historic compatibility.
1227  */
1228
1229 static int ds_event(struct pcmcia_socket *skt, event_t event, int priority)
1230 {
1231         struct pcmcia_socket *s = pcmcia_get_socket(skt);
1232
1233         if (!s) {
1234                 dev_printk(KERN_ERR, &skt->dev,
1235                            "PCMCIA obtaining reference to socket "      \
1236                            "failed, event 0x%x lost!\n", event);
1237                 return -ENODEV;
1238         }
1239
1240         dev_dbg(&skt->dev, "ds_event(0x%06x, %d, 0x%p)\n",
1241                    event, priority, skt);
1242
1243         switch (event) {
1244         case CS_EVENT_CARD_REMOVAL:
1245                 atomic_set(&skt->present, 0);
1246                 pcmcia_card_remove(skt, NULL);
1247                 handle_event(skt, event);
1248                 mutex_lock(&s->ops_mutex);
1249                 destroy_cis_cache(s);
1250                 pcmcia_cleanup_irq(s);
1251                 mutex_unlock(&s->ops_mutex);
1252                 break;
1253
1254         case CS_EVENT_CARD_INSERTION:
1255                 atomic_set(&skt->present, 1);
1256                 mutex_lock(&s->ops_mutex);
1257                 s->pcmcia_state.has_pfc = 0;
1258                 destroy_cis_cache(s); /* to be on the safe side... */
1259                 mutex_unlock(&s->ops_mutex);
1260                 pcmcia_card_add(skt);
1261                 handle_event(skt, event);
1262                 break;
1263
1264         case CS_EVENT_EJECTION_REQUEST:
1265                 break;
1266
1267         case CS_EVENT_PM_RESUME:
1268                 if (verify_cis_cache(skt) != 0) {
1269                         dev_dbg(&skt->dev, "cis mismatch - different card\n");
1270                         /* first, remove the card */
1271                         ds_event(skt, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
1272                         mutex_lock(&s->ops_mutex);
1273                         destroy_cis_cache(skt);
1274                         kfree(skt->fake_cis);
1275                         skt->fake_cis = NULL;
1276                         s->functions = 0;
1277                         mutex_unlock(&s->ops_mutex);
1278                         /* now, add the new card */
1279                         ds_event(skt, CS_EVENT_CARD_INSERTION,
1280                                  CS_EVENT_PRI_LOW);
1281                 }
1282                 handle_event(skt, event);
1283                 break;
1284
1285         case CS_EVENT_PM_SUSPEND:
1286         case CS_EVENT_RESET_PHYSICAL:
1287         case CS_EVENT_CARD_RESET:
1288         default:
1289                 handle_event(skt, event);
1290                 break;
1291     }
1292
1293     pcmcia_put_socket(s);
1294
1295     return 0;
1296 } /* ds_event */
1297
1298 /*
1299  * NOTE: This is racy. There's no guarantee the card will still be
1300  * physically present, even if the call to this function returns
1301  * non-NULL. Furthermore, the device driver most likely is unbound
1302  * almost immediately, so the timeframe where pcmcia_dev_present
1303  * returns NULL is probably really really small.
1304  */
1305 struct pcmcia_device *pcmcia_dev_present(struct pcmcia_device *_p_dev)
1306 {
1307         struct pcmcia_device *p_dev;
1308         struct pcmcia_device *ret = NULL;
1309
1310         p_dev = pcmcia_get_dev(_p_dev);
1311         if (!p_dev)
1312                 return NULL;
1313
1314         if (atomic_read(&p_dev->socket->present) != 0)
1315                 ret = p_dev;
1316
1317         pcmcia_put_dev(p_dev);
1318         return ret;
1319 }
1320 EXPORT_SYMBOL(pcmcia_dev_present);
1321
1322
1323 static struct pcmcia_callback pcmcia_bus_callback = {
1324         .owner = THIS_MODULE,
1325         .event = ds_event,
1326         .requery = pcmcia_requery,
1327         .validate = pccard_validate_cis,
1328         .suspend = pcmcia_bus_suspend,
1329         .resume = pcmcia_bus_resume,
1330 };
1331
1332 static int __devinit pcmcia_bus_add_socket(struct device *dev,
1333                                            struct class_interface *class_intf)
1334 {
1335         struct pcmcia_socket *socket = dev_get_drvdata(dev);
1336         int ret;
1337
1338         socket = pcmcia_get_socket(socket);
1339         if (!socket) {
1340                 dev_printk(KERN_ERR, dev,
1341                            "PCMCIA obtaining reference to socket failed\n");
1342                 return -ENODEV;
1343         }
1344
1345         ret = sysfs_create_bin_file(&dev->kobj, &pccard_cis_attr);
1346         if (ret) {
1347                 dev_printk(KERN_ERR, dev, "PCMCIA registration failed\n");
1348                 pcmcia_put_socket(socket);
1349                 return ret;
1350         }
1351
1352 #ifdef CONFIG_PCMCIA_IOCTL
1353         init_waitqueue_head(&socket->queue);
1354 #endif
1355         INIT_LIST_HEAD(&socket->devices_list);
1356         memset(&socket->pcmcia_state, 0, sizeof(u8));
1357         socket->device_count = 0;
1358
1359         ret = pccard_register_pcmcia(socket, &pcmcia_bus_callback);
1360         if (ret) {
1361                 dev_printk(KERN_ERR, dev, "PCMCIA registration failed\n");
1362                 pcmcia_put_socket(socket);
1363                 return ret;
1364         }
1365
1366         atomic_set(&socket->present, 0);
1367
1368         return 0;
1369 }
1370
1371 static void pcmcia_bus_remove_socket(struct device *dev,
1372                                      struct class_interface *class_intf)
1373 {
1374         struct pcmcia_socket *socket = dev_get_drvdata(dev);
1375
1376         if (!socket)
1377                 return;
1378
1379         pccard_register_pcmcia(socket, NULL);
1380
1381         /* unregister any unbound devices */
1382         mutex_lock(&socket->skt_mutex);
1383         pcmcia_card_remove(socket, NULL);
1384         release_cis_mem(socket);
1385         mutex_unlock(&socket->skt_mutex);
1386
1387         sysfs_remove_bin_file(&dev->kobj, &pccard_cis_attr);
1388
1389         pcmcia_put_socket(socket);
1390
1391         return;
1392 }
1393
1394
1395 /* the pcmcia_bus_interface is used to handle pcmcia socket devices */
1396 static struct class_interface pcmcia_bus_interface __refdata = {
1397         .class = &pcmcia_socket_class,
1398         .add_dev = &pcmcia_bus_add_socket,
1399         .remove_dev = &pcmcia_bus_remove_socket,
1400 };
1401
1402
1403 struct bus_type pcmcia_bus_type = {
1404         .name = "pcmcia",
1405         .uevent = pcmcia_bus_uevent,
1406         .match = pcmcia_bus_match,
1407         .dev_attrs = pcmcia_dev_attrs,
1408         .probe = pcmcia_device_probe,
1409         .remove = pcmcia_device_remove,
1410         .suspend = pcmcia_dev_suspend,
1411         .resume = pcmcia_dev_resume,
1412 };
1413
1414
1415 static int __init init_pcmcia_bus(void)
1416 {
1417         int ret;
1418
1419         ret = bus_register(&pcmcia_bus_type);
1420         if (ret < 0) {
1421                 printk(KERN_WARNING "pcmcia: bus_register error: %d\n", ret);
1422                 return ret;
1423         }
1424         ret = class_interface_register(&pcmcia_bus_interface);
1425         if (ret < 0) {
1426                 printk(KERN_WARNING
1427                         "pcmcia: class_interface_register error: %d\n", ret);
1428                 bus_unregister(&pcmcia_bus_type);
1429                 return ret;
1430         }
1431
1432         pcmcia_setup_ioctl();
1433
1434         return 0;
1435 }
1436 fs_initcall(init_pcmcia_bus); /* one level after subsys_initcall so that
1437                                * pcmcia_socket_class is already registered */
1438
1439
1440 static void __exit exit_pcmcia_bus(void)
1441 {
1442         pcmcia_cleanup_ioctl();
1443
1444         class_interface_unregister(&pcmcia_bus_interface);
1445
1446         bus_unregister(&pcmcia_bus_type);
1447 }
1448 module_exit(exit_pcmcia_bus);
1449
1450
1451 MODULE_ALIAS("ds");