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 - 2010      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.h>
  30 #include <pcmcia/cistpl.h>
  31 #include <pcmcia/ds.h>
  32 #include <pcmcia/ss.h>
  33
  34 #include "cs_internal.h"
  35
  36 /*====================================================================*/
  37
  38 /* Module parameters */
  39
  40 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
  41 MODULE_DESCRIPTION("PCMCIA Driver Services");
  42 MODULE_LICENSE("GPL");
  43
  44
  45 /*====================================================================*/
  46
  47 static void pcmcia_check_driver(struct pcmcia_driver *p_drv)
  48 {
  49         struct pcmcia_device_id *did = p_drv->id_table;
  50         unsigned int i;
  51         u32 hash;
  52
  53         if (!p_drv->probe || !p_drv->remove)
  54                 printk(KERN_DEBUG "pcmcia: %s lacks a requisite callback "
  55                        "function\n", p_drv->drv.name);
  56
  57         while (did && did->match_flags) {
  58                 for (i = 0; i < 4; i++) {
  59                         if (!did->prod_id[i])
  60                                 continue;
  61
  62                         hash = crc32(0, did->prod_id[i], strlen(did->prod_id[i]));
  63                         if (hash == did->prod_id_hash[i])
  64                                 continue;
  65
  66                         printk(KERN_DEBUG "pcmcia: %s: invalid hash for "
  67                                "product string \"%s\": is 0x%x, should "
  68                                "be 0x%x\n", p_drv->drv.name, did->prod_id[i],
  69                                did->prod_id_hash[i], hash);
  70                         printk(KERN_DEBUG "pcmcia: see "
  71                                 "Documentation/pcmcia/devicetable.txt for "
  72                                 "details\n");
  73                 }
  74                 did++;
  75         }
  76
  77         return;
  78 }
  79
  80
  81 /*======================================================================*/
  82
  83
  84 struct pcmcia_dynid {
  85         struct list_head                node;
  86         struct pcmcia_device_id         id;
  87 };
  88
  89 /**
  90  * pcmcia_store_new_id - add a new PCMCIA device ID to this driver and re-probe devices
  91  * @driver: target device driver
  92  * @buf: buffer for scanning device ID data
  93  * @count: input size
  94  *
  95  * Adds a new dynamic PCMCIA device ID to this driver,
  96  * and causes the driver to probe for all devices again.
  97  */
  98 static ssize_t
  99 pcmcia_store_new_id(struct device_driver *driver, const char *buf, size_t count)
 100 {
 101         struct pcmcia_dynid *dynid;
 102         struct pcmcia_driver *pdrv = to_pcmcia_drv(driver);
 103         __u16 match_flags, manf_id, card_id;
 104         __u8 func_id, function, device_no;
 105         __u32 prod_id_hash[4] = {0, 0, 0, 0};
 106         int fields = 0;
 107         int retval = 0;
 108
 109         fields = sscanf(buf, "%hx %hx %hx %hhx %hhx %hhx %x %x %x %x",
 110                         &match_flags, &manf_id, &card_id, &func_id, &function, &device_no,
 111                         &prod_id_hash[0], &prod_id_hash[1], &prod_id_hash[2], &prod_id_hash[3]);
 112         if (fields < 6)
 113                 return -EINVAL;
 114
 115         dynid = kzalloc(sizeof(struct pcmcia_dynid), GFP_KERNEL);
 116         if (!dynid)
 117                 return -ENOMEM;
 118
 119         dynid->id.match_flags = match_flags;
 120         dynid->id.manf_id = manf_id;
 121         dynid->id.card_id = card_id;
 122         dynid->id.func_id = func_id;
 123         dynid->id.function = function;
 124         dynid->id.device_no = device_no;
 125         memcpy(dynid->id.prod_id_hash, prod_id_hash, sizeof(__u32) * 4);
 126
 127         mutex_lock(&pdrv->dynids.lock);
 128         list_add_tail(&dynid->node, &pdrv->dynids.list);
 129         mutex_unlock(&pdrv->dynids.lock);
 130
 131         if (get_driver(&pdrv->drv)) {
 132                 retval = driver_attach(&pdrv->drv);
 133                 put_driver(&pdrv->drv);
 134         }
 135
 136         if (retval)
 137                 return retval;
 138         return count;
 139 }
 140 static DRIVER_ATTR(new_id, S_IWUSR, NULL, pcmcia_store_new_id);
 141
 142 static void
 143 pcmcia_free_dynids(struct pcmcia_driver *drv)
 144 {
 145         struct pcmcia_dynid *dynid, *n;
 146
 147         mutex_lock(&drv->dynids.lock);
 148         list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
 149                 list_del(&dynid->node);
 150                 kfree(dynid);
 151         }
 152         mutex_unlock(&drv->dynids.lock);
 153 }
 154
 155 static int
 156 pcmcia_create_newid_file(struct pcmcia_driver *drv)
 157 {
 158         int error = 0;
 159         if (drv->probe != NULL)
 160                 error = driver_create_file(&drv->drv, &driver_attr_new_id);
 161         return error;
 162 }
 163
 164
 165 /**
 166  * pcmcia_register_driver - register a PCMCIA driver with the bus core
 167  * @driver: the &driver being registered
 168  *
 169  * Registers a PCMCIA driver with the PCMCIA bus core.
 170  */
 171 int pcmcia_register_driver(struct pcmcia_driver *driver)
 172 {
 173         int error;
 174
 175         if (!driver)
 176                 return -EINVAL;
 177
 178         pcmcia_check_driver(driver);
 179
 180         /* initialize common fields */
 181         driver->drv.bus = &pcmcia_bus_type;
 182         driver->drv.owner = driver->owner;
 183         mutex_init(&driver->dynids.lock);
 184         INIT_LIST_HEAD(&driver->dynids.list);
 185
 186         pr_debug("registering driver %s\n", driver->drv.name);
 187
 188         error = driver_register(&driver->drv);
 189         if (error < 0)
 190                 return error;
 191
 192         error = pcmcia_create_newid_file(driver);
 193         if (error)
 194                 driver_unregister(&driver->drv);
 195
 196         return error;
 197 }
 198 EXPORT_SYMBOL(pcmcia_register_driver);
 199
 200 /**
 201  * pcmcia_unregister_driver - unregister a PCMCIA driver with the bus core
 202  * @driver: the &driver being unregistered
 203  */
 204 void pcmcia_unregister_driver(struct pcmcia_driver *driver)
 205 {
 206         pr_debug("unregistering driver %s\n", driver->drv.name);
 207         driver_unregister(&driver->drv);
 208         pcmcia_free_dynids(driver);
 209 }
 210 EXPORT_SYMBOL(pcmcia_unregister_driver);
 211
 212
 213 /* pcmcia_device handling */
 214
 215 static struct pcmcia_device *pcmcia_get_dev(struct pcmcia_device *p_dev)
 216 {
 217         struct device *tmp_dev;
 218         tmp_dev = get_device(&p_dev->dev);
 219         if (!tmp_dev)
 220                 return NULL;
 221         return to_pcmcia_dev(tmp_dev);
 222 }
 223
 224 static void pcmcia_put_dev(struct pcmcia_device *p_dev)
 225 {
 226         if (p_dev)
 227                 put_device(&p_dev->dev);
 228 }
 229
 230 static void pcmcia_release_function(struct kref *ref)
 231 {
 232         struct config_t *c = container_of(ref, struct config_t, ref);
 233         pr_debug("releasing config_t\n");
 234         kfree(c);
 235 }
 236
 237 static void pcmcia_release_dev(struct device *dev)
 238 {
 239         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
 240         int i;
 241         dev_dbg(dev, "releasing device\n");
 242         pcmcia_put_socket(p_dev->socket);
 243         for (i = 0; i < 4; i++)
 244                 kfree(p_dev->prod_id[i]);
 245         kfree(p_dev->devname);
 246         kref_put(&p_dev->function_config->ref, pcmcia_release_function);
 247         kfree(p_dev);
 248 }
 249
 250
 251 static int pcmcia_device_probe(struct device *dev)
 252 {
 253         struct pcmcia_device *p_dev;
 254         struct pcmcia_driver *p_drv;
 255         struct pcmcia_socket *s;
 256         cistpl_config_t cis_config;
 257         int ret = 0;
 258
 259         dev = get_device(dev);
 260         if (!dev)
 261                 return -ENODEV;
 262
 263         p_dev = to_pcmcia_dev(dev);
 264         p_drv = to_pcmcia_drv(dev->driver);
 265         s = p_dev->socket;
 266
 267         dev_dbg(dev, "trying to bind to %s\n", p_drv->drv.name);
 268
 269         if ((!p_drv->probe) || (!p_dev->function_config) ||
 270             (!try_module_get(p_drv->owner))) {
 271                 ret = -EINVAL;
 272                 goto put_dev;
 273         }
 274
 275         /* set up some more device information */
 276         ret = pccard_read_tuple(p_dev->socket, p_dev->func, CISTPL_CONFIG,
 277                                 &cis_config);
 278         if (!ret) {
 279                 p_dev->conf.ConfigBase = cis_config.base;
 280                 p_dev->conf.Present = cis_config.rmask[0];
 281         } else {
 282                 dev_printk(KERN_INFO, dev,
 283                            "pcmcia: could not parse base and rmask0 of CIS\n");
 284                 p_dev->conf.ConfigBase = 0;
 285                 p_dev->conf.Present = 0;
 286         }
 287
 288         ret = p_drv->probe(p_dev);
 289         if (ret) {
 290                 dev_dbg(dev, "binding to %s failed with %d\n",
 291                            p_drv->drv.name, ret);
 292                 goto put_module;
 293         }
 294
 295         mutex_lock(&s->ops_mutex);
 296         if ((s->pcmcia_pfc) &&
 297             (p_dev->socket->device_count == 1) && (p_dev->device_no == 0))
 298                 pcmcia_parse_uevents(s, PCMCIA_UEVENT_REQUERY);
 299         mutex_unlock(&s->ops_mutex);
 300
 301 put_module:
 302         if (ret)
 303                 module_put(p_drv->owner);
 304 put_dev:
 305         if (ret)
 306                 put_device(dev);
 307         return ret;
 308 }
 309
 310
 311 /*
 312  * Removes a PCMCIA card from the device tree and socket list.
 313  */
 314 static void pcmcia_card_remove(struct pcmcia_socket *s, struct pcmcia_device *leftover)
 315 {
 316         struct pcmcia_device    *p_dev;
 317         struct pcmcia_device    *tmp;
 318
 319         dev_dbg(leftover ? &leftover->dev : &s->dev,
 320                    "pcmcia_card_remove(%d) %s\n", s->sock,
 321                    leftover ? leftover->devname : "");
 322
 323         mutex_lock(&s->ops_mutex);
 324         if (!leftover)
 325                 s->device_count = 0;
 326         else
 327                 s->device_count = 1;
 328         mutex_unlock(&s->ops_mutex);
 329
 330         /* unregister all pcmcia_devices registered with this socket, except leftover */
 331         list_for_each_entry_safe(p_dev, tmp, &s->devices_list, socket_device_list) {
 332                 if (p_dev == leftover)
 333                         continue;
 334
 335                 mutex_lock(&s->ops_mutex);
 336                 list_del(&p_dev->socket_device_list);
 337                 mutex_unlock(&s->ops_mutex);
 338
 339                 dev_dbg(&p_dev->dev, "unregistering device\n");
 340                 device_unregister(&p_dev->dev);
 341         }
 342
 343         return;
 344 }
 345
 346 static int pcmcia_device_remove(struct device *dev)
 347 {
 348         struct pcmcia_device *p_dev;
 349         struct pcmcia_driver *p_drv;
 350         int i;
 351
 352         p_dev = to_pcmcia_dev(dev);
 353         p_drv = to_pcmcia_drv(dev->driver);
 354
 355         dev_dbg(dev, "removing device\n");
 356
 357         /* If we're removing the primary module driving a
 358          * pseudo multi-function card, we need to unbind
 359          * all devices
 360          */
 361         if ((p_dev->socket->pcmcia_pfc) &&
 362             (p_dev->socket->device_count > 0) &&
 363             (p_dev->device_no == 0))
 364                 pcmcia_card_remove(p_dev->socket, p_dev);
 365
 366         /* detach the "instance" */
 367         if (!p_drv)
 368                 return 0;
 369
 370         if (p_drv->remove)
 371                 p_drv->remove(p_dev);
 372
 373         /* check for proper unloading */
 374         if (p_dev->_irq || p_dev->_io || p_dev->_locked)
 375                 dev_printk(KERN_INFO, dev,
 376                         "pcmcia: driver %s did not release config properly\n",
 377                         p_drv->drv.name);
 378
 379         for (i = 0; i < MAX_WIN; i++)
 380                 if (p_dev->_win & CLIENT_WIN_REQ(i))
 381                         dev_printk(KERN_INFO, dev,
 382                           "pcmcia: driver %s did not release window properly\n",
 383                            p_drv->drv.name);
 384
 385         /* references from pcmcia_probe_device */
 386         pcmcia_put_dev(p_dev);
 387         module_put(p_drv->owner);
 388
 389         return 0;
 390 }
 391
 392
 393 /*
 394  * pcmcia_device_query -- determine information about a pcmcia device
 395  */
 396 static int pcmcia_device_query(struct pcmcia_device *p_dev)
 397 {
 398         cistpl_manfid_t manf_id;
 399         cistpl_funcid_t func_id;
 400         cistpl_vers_1_t *vers1;
 401         unsigned int i;
 402
 403         vers1 = kmalloc(sizeof(*vers1), GFP_KERNEL);
 404         if (!vers1)
 405                 return -ENOMEM;
 406
 407         if (!pccard_read_tuple(p_dev->socket, BIND_FN_ALL,
 408                                CISTPL_MANFID, &manf_id)) {
 409                 mutex_lock(&p_dev->socket->ops_mutex);
 410                 p_dev->manf_id = manf_id.manf;
 411                 p_dev->card_id = manf_id.card;
 412                 p_dev->has_manf_id = 1;
 413                 p_dev->has_card_id = 1;
 414                 mutex_unlock(&p_dev->socket->ops_mutex);
 415         }
 416
 417         if (!pccard_read_tuple(p_dev->socket, p_dev->func,
 418                                CISTPL_FUNCID, &func_id)) {
 419                 mutex_lock(&p_dev->socket->ops_mutex);
 420                 p_dev->func_id = func_id.func;
 421                 p_dev->has_func_id = 1;
 422                 mutex_unlock(&p_dev->socket->ops_mutex);
 423         } else {
 424                 /* rule of thumb: cards with no FUNCID, but with
 425                  * common memory device geometry information, are
 426                  * probably memory cards (from pcmcia-cs) */
 427                 cistpl_device_geo_t *devgeo;
 428
 429                 devgeo = kmalloc(sizeof(*devgeo), GFP_KERNEL);
 430                 if (!devgeo) {
 431                         kfree(vers1);
 432                         return -ENOMEM;
 433                 }
 434                 if (!pccard_read_tuple(p_dev->socket, p_dev->func,
 435                                       CISTPL_DEVICE_GEO, devgeo)) {
 436                         dev_dbg(&p_dev->dev,
 437                                    "mem device geometry probably means "
 438                                    "FUNCID_MEMORY\n");
 439                         mutex_lock(&p_dev->socket->ops_mutex);
 440                         p_dev->func_id = CISTPL_FUNCID_MEMORY;
 441                         p_dev->has_func_id = 1;
 442                         mutex_unlock(&p_dev->socket->ops_mutex);
 443                 }
 444                 kfree(devgeo);
 445         }
 446
 447         if (!pccard_read_tuple(p_dev->socket, BIND_FN_ALL, CISTPL_VERS_1,
 448                                vers1)) {
 449                 mutex_lock(&p_dev->socket->ops_mutex);
 450                 for (i = 0; i < min_t(unsigned int, 4, vers1->ns); i++) {
 451                         char *tmp;
 452                         unsigned int length;
 453                         char *new;
 454
 455                         tmp = vers1->str + vers1->ofs[i];
 456
 457                         length = strlen(tmp) + 1;
 458                         if ((length < 2) || (length > 255))
 459                                 continue;
 460
 461                         new = kmalloc(sizeof(char) * length, GFP_KERNEL);
 462                         if (!new)
 463                                 continue;
 464
 465                         new = strncpy(new, tmp, length);
 466
 467                         tmp = p_dev->prod_id[i];
 468                         p_dev->prod_id[i] = new;
 469                         kfree(tmp);
 470                 }
 471                 mutex_unlock(&p_dev->socket->ops_mutex);
 472         }
 473
 474         kfree(vers1);
 475         return 0;
 476 }
 477
 478
 479 static struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s,
 480                                                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->irq = tmp_dev->irq;
 535                         kref_get(&p_dev->function_config->ref);
 536                 }
 537
 538         /* Add to the list in pcmcia_bus_socket */
 539         list_add(&p_dev->socket_device_list, &s->devices_list);
 540
 541         if (pcmcia_setup_irq(p_dev))
 542                 dev_warn(&p_dev->dev,
 543                         "IRQ setup failed -- device might not work\n");
 544
 545         if (!p_dev->function_config) {
 546                 config_t *c;
 547                 dev_dbg(&p_dev->dev, "creating config_t\n");
 548                 c = kzalloc(sizeof(struct config_t), GFP_KERNEL);
 549                 if (!c) {
 550                         mutex_unlock(&s->ops_mutex);
 551                         goto err_unreg;
 552                 }
 553                 p_dev->function_config = c;
 554                 kref_init(&c->ref);
 555                 for (i = 0; i < MAX_IO_WIN; i++) {
 556                         c->io[i].name = p_dev->devname;
 557                         c->io[i].flags = IORESOURCE_IO;
 558                 }
 559                 for (i = 0; i< MAX_WIN; i++) {
 560                         c->mem[i].name = p_dev->devname;
 561                         c->mem[i].flags = IORESOURCE_MEM;
 562                 }
 563         }
 564         for (i = 0; i < MAX_IO_WIN; i++)
 565                 p_dev->resource[i] = &p_dev->function_config->io[i];
 566         for (; i < (MAX_IO_WIN + MAX_WIN); i++)
 567                 p_dev->resource[i] = &p_dev->function_config->mem[i-MAX_IO_WIN];
 568
 569         mutex_unlock(&s->ops_mutex);
 570
 571         dev_printk(KERN_NOTICE, &p_dev->dev,
 572                    "pcmcia: registering new device %s (IRQ: %d)\n",
 573                    p_dev->devname, p_dev->irq);
 574
 575         pcmcia_device_query(p_dev);
 576
 577         if (device_register(&p_dev->dev))
 578                 goto err_unreg;
 579
 580         return p_dev;
 581
 582  err_unreg:
 583         mutex_lock(&s->ops_mutex);
 584         list_del(&p_dev->socket_device_list);
 585         mutex_unlock(&s->ops_mutex);
 586
 587  err_free:
 588         mutex_lock(&s->ops_mutex);
 589         s->device_count--;
 590         mutex_unlock(&s->ops_mutex);
 591
 592         for (i = 0; i < 4; i++)
 593                 kfree(p_dev->prod_id[i]);
 594         kfree(p_dev->devname);
 595         kfree(p_dev);
 596  err_put:
 597         pcmcia_put_socket(s);
 598
 599         return NULL;
 600 }
 601
 602
 603 static int pcmcia_card_add(struct pcmcia_socket *s)
 604 {
 605         cistpl_longlink_mfc_t mfc;
 606         unsigned int no_funcs, i, no_chains;
 607         int ret = -EAGAIN;
 608
 609         mutex_lock(&s->ops_mutex);
 610         if (!(s->resource_setup_done)) {
 611                 dev_dbg(&s->dev,
 612                            "no resources available, delaying card_add\n");
 613                 mutex_unlock(&s->ops_mutex);
 614                 return -EAGAIN; /* try again, but later... */
 615         }
 616
 617         if (pcmcia_validate_mem(s)) {
 618                 dev_dbg(&s->dev, "validating mem resources failed, "
 619                        "delaying card_add\n");
 620                 mutex_unlock(&s->ops_mutex);
 621                 return -EAGAIN; /* try again, but later... */
 622         }
 623         mutex_unlock(&s->ops_mutex);
 624
 625         ret = pccard_validate_cis(s, &no_chains);
 626         if (ret || !no_chains) {
 627                 dev_dbg(&s->dev, "invalid CIS or invalid resources\n");
 628                 return -ENODEV;
 629         }
 630
 631         if (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_LONGLINK_MFC, &mfc))
 632                 no_funcs = mfc.nfn;
 633         else
 634                 no_funcs = 1;
 635         s->functions = no_funcs;
 636
 637         for (i = 0; i < no_funcs; i++)
 638                 pcmcia_device_add(s, i);
 639
 640         return ret;
 641 }
 642
 643
 644 static int pcmcia_requery_callback(struct device *dev, void * _data)
 645 {
 646         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
 647         if (!p_dev->dev.driver) {
 648                 dev_dbg(dev, "update device information\n");
 649                 pcmcia_device_query(p_dev);
 650         }
 651
 652         return 0;
 653 }
 654
 655
 656 static void pcmcia_requery(struct pcmcia_socket *s)
 657 {
 658         int has_pfc;
 659
 660         if (s->functions == 0) {
 661                 pcmcia_card_add(s);
 662                 return;
 663         }
 664
 665         /* some device information might have changed because of a CIS
 666          * update or because we can finally read it correctly... so
 667          * determine it again, overwriting old values if necessary. */
 668         bus_for_each_dev(&pcmcia_bus_type, NULL, NULL, pcmcia_requery_callback);
 669
 670         /* if the CIS changed, we need to check whether the number of
 671          * functions changed. */
 672         if (s->fake_cis) {
 673                 int old_funcs, new_funcs;
 674                 cistpl_longlink_mfc_t mfc;
 675
 676                 /* does this cis override add or remove functions? */
 677                 old_funcs = s->functions;
 678
 679                 if (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_LONGLINK_MFC,
 680                                         &mfc))
 681                         new_funcs = mfc.nfn;
 682                 else
 683                         new_funcs = 1;
 684                 if (old_funcs != new_funcs) {
 685                         /* we need to re-start */
 686                         pcmcia_card_remove(s, NULL);
 687                         s->functions = 0;
 688                         pcmcia_card_add(s);
 689                 }
 690         }
 691
 692         /* If the PCMCIA device consists of two pseudo devices,
 693          * call pcmcia_device_add() -- which will fail if both
 694          * devices are already registered. */
 695         mutex_lock(&s->ops_mutex);
 696         has_pfc = s->pcmcia_pfc;
 697         mutex_unlock(&s->ops_mutex);
 698         if (has_pfc)
 699                 pcmcia_device_add(s, 0);
 700
 701         /* we re-scan all devices, not just the ones connected to this
 702          * socket. This does not matter, though. */
 703         if (bus_rescan_devices(&pcmcia_bus_type))
 704                 dev_warn(&s->dev, "rescanning the bus failed\n");
 705 }
 706
 707
 708 #ifdef CONFIG_PCMCIA_LOAD_CIS
 709
 710 /**
 711  * pcmcia_load_firmware - load CIS from userspace if device-provided is broken
 712  * @dev: the pcmcia device which needs a CIS override
 713  * @filename: requested filename in /lib/firmware/
 714  *
 715  * This uses the in-kernel firmware loading mechanism to use a "fake CIS" if
 716  * the one provided by the card is broken. The firmware files reside in
 717  * /lib/firmware/ in userspace.
 718  */
 719 static int pcmcia_load_firmware(struct pcmcia_device *dev, char * filename)
 720 {
 721         struct pcmcia_socket *s = dev->socket;
 722         const struct firmware *fw;
 723         int ret = -ENOMEM;
 724         cistpl_longlink_mfc_t mfc;
 725         int old_funcs, new_funcs = 1;
 726
 727         if (!filename)
 728                 return -EINVAL;
 729
 730         dev_dbg(&dev->dev, "trying to load CIS file %s\n", filename);
 731
 732         if (request_firmware(&fw, filename, &dev->dev) == 0) {
 733                 if (fw->size >= CISTPL_MAX_CIS_SIZE) {
 734                         ret = -EINVAL;
 735                         dev_printk(KERN_ERR, &dev->dev,
 736                                    "pcmcia: CIS override is too big\n");
 737                         goto release;
 738                 }
 739
 740                 if (!pcmcia_replace_cis(s, fw->data, fw->size))
 741                         ret = 0;
 742                 else {
 743                         dev_printk(KERN_ERR, &dev->dev,
 744                                    "pcmcia: CIS override failed\n");
 745                         goto release;
 746                 }
 747
 748                 /* we need to re-start if the number of functions changed */
 749                 old_funcs = s->functions;
 750                 if (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_LONGLINK_MFC,
 751                                         &mfc))
 752                         new_funcs = mfc.nfn;
 753
 754                 if (old_funcs != new_funcs)
 755                         ret = -EBUSY;
 756
 757                 /* update information */
 758                 pcmcia_device_query(dev);
 759
 760                 /* requery (as number of functions might have changed) */
 761                 pcmcia_parse_uevents(s, PCMCIA_UEVENT_REQUERY);
 762         }
 763  release:
 764         release_firmware(fw);
 765
 766         return ret;
 767 }
 768
 769 #else /* !CONFIG_PCMCIA_LOAD_CIS */
 770
 771 static inline int pcmcia_load_firmware(struct pcmcia_device *dev, char * filename)
 772 {
 773         return -ENODEV;
 774 }
 775
 776 #endif
 777
 778
 779 static inline int pcmcia_devmatch(struct pcmcia_device *dev,
 780                                   struct pcmcia_device_id *did)
 781 {
 782         if (did->match_flags & PCMCIA_DEV_ID_MATCH_MANF_ID) {
 783                 if ((!dev->has_manf_id) || (dev->manf_id != did->manf_id))
 784                         return 0;
 785         }
 786
 787         if (did->match_flags & PCMCIA_DEV_ID_MATCH_CARD_ID) {
 788                 if ((!dev->has_card_id) || (dev->card_id != did->card_id))
 789                         return 0;
 790         }
 791
 792         if (did->match_flags & PCMCIA_DEV_ID_MATCH_FUNCTION) {
 793                 if (dev->func != did->function)
 794                         return 0;
 795         }
 796
 797         if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID1) {
 798                 if (!dev->prod_id[0])
 799                         return 0;
 800                 if (strcmp(did->prod_id[0], dev->prod_id[0]))
 801                         return 0;
 802         }
 803
 804         if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID2) {
 805                 if (!dev->prod_id[1])
 806                         return 0;
 807                 if (strcmp(did->prod_id[1], dev->prod_id[1]))
 808                         return 0;
 809         }
 810
 811         if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID3) {
 812                 if (!dev->prod_id[2])
 813                         return 0;
 814                 if (strcmp(did->prod_id[2], dev->prod_id[2]))
 815                         return 0;
 816         }
 817
 818         if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID4) {
 819                 if (!dev->prod_id[3])
 820                         return 0;
 821                 if (strcmp(did->prod_id[3], dev->prod_id[3]))
 822                         return 0;
 823         }
 824
 825         if (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO) {
 826                 dev_dbg(&dev->dev, "this is a pseudo-multi-function device\n");
 827                 mutex_lock(&dev->socket->ops_mutex);
 828                 dev->socket->pcmcia_pfc = 1;
 829                 mutex_unlock(&dev->socket->ops_mutex);
 830                 if (dev->device_no != did->device_no)
 831                         return 0;
 832         }
 833
 834         if (did->match_flags & PCMCIA_DEV_ID_MATCH_FUNC_ID) {
 835                 int ret;
 836
 837                 if ((!dev->has_func_id) || (dev->func_id != did->func_id))
 838                         return 0;
 839
 840                 /* if this is a pseudo-multi-function device,
 841                  * we need explicit matches */
 842                 if (dev->socket->pcmcia_pfc)
 843                         return 0;
 844                 if (dev->device_no)
 845                         return 0;
 846
 847                 /* also, FUNC_ID matching needs to be activated by userspace
 848                  * after it has re-checked that there is no possible module
 849                  * with a prod_id/manf_id/card_id match.
 850                  */
 851                 mutex_lock(&dev->socket->ops_mutex);
 852                 ret = dev->allow_func_id_match;
 853                 mutex_unlock(&dev->socket->ops_mutex);
 854
 855                 if (!ret) {
 856                         dev_dbg(&dev->dev,
 857                                 "skipping FUNC_ID match until userspace ACK\n");
 858                         return 0;
 859                 }
 860         }
 861
 862         if (did->match_flags & PCMCIA_DEV_ID_MATCH_FAKE_CIS) {
 863                 dev_dbg(&dev->dev, "device needs a fake CIS\n");
 864                 if (!dev->socket->fake_cis)
 865                         if (pcmcia_load_firmware(dev, did->cisfile))
 866                                 return 0;
 867         }
 868
 869         if (did->match_flags & PCMCIA_DEV_ID_MATCH_ANONYMOUS) {
 870                 int i;
 871                 for (i = 0; i < 4; i++)
 872                         if (dev->prod_id[i])
 873                                 return 0;
 874                 if (dev->has_manf_id || dev->has_card_id || dev->has_func_id)
 875                         return 0;
 876         }
 877
 878         return 1;
 879 }
 880
 881
 882 static int pcmcia_bus_match(struct device *dev, struct device_driver *drv)
 883 {
 884         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
 885         struct pcmcia_driver *p_drv = to_pcmcia_drv(drv);
 886         struct pcmcia_device_id *did = p_drv->id_table;
 887         struct pcmcia_dynid *dynid;
 888
 889         /* match dynamic devices first */
 890         mutex_lock(&p_drv->dynids.lock);
 891         list_for_each_entry(dynid, &p_drv->dynids.list, node) {
 892                 dev_dbg(dev, "trying to match to %s\n", drv->name);
 893                 if (pcmcia_devmatch(p_dev, &dynid->id)) {
 894                         dev_dbg(dev, "matched to %s\n", drv->name);
 895                         mutex_unlock(&p_drv->dynids.lock);
 896                         return 1;
 897                 }
 898         }
 899         mutex_unlock(&p_drv->dynids.lock);
 900
 901         while (did && did->match_flags) {
 902                 dev_dbg(dev, "trying to match to %s\n", drv->name);
 903                 if (pcmcia_devmatch(p_dev, did)) {
 904                         dev_dbg(dev, "matched to %s\n", drv->name);
 905                         return 1;
 906                 }
 907                 did++;
 908         }
 909
 910         return 0;
 911 }
 912
 913 #ifdef CONFIG_HOTPLUG
 914
 915 static int pcmcia_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 916 {
 917         struct pcmcia_device *p_dev;
 918         int i;
 919         u32 hash[4] = { 0, 0, 0, 0};
 920
 921         if (!dev)
 922                 return -ENODEV;
 923
 924         p_dev = to_pcmcia_dev(dev);
 925
 926         /* calculate hashes */
 927         for (i = 0; i < 4; i++) {
 928                 if (!p_dev->prod_id[i])
 929                         continue;
 930                 hash[i] = crc32(0, p_dev->prod_id[i], strlen(p_dev->prod_id[i]));
 931         }
 932
 933         if (add_uevent_var(env, "SOCKET_NO=%u", p_dev->socket->sock))
 934                 return -ENOMEM;
 935
 936         if (add_uevent_var(env, "DEVICE_NO=%02X", p_dev->device_no))
 937                 return -ENOMEM;
 938
 939         if (add_uevent_var(env, "MODALIAS=pcmcia:m%04Xc%04Xf%02Xfn%02Xpfn%02X"
 940                            "pa%08Xpb%08Xpc%08Xpd%08X",
 941                            p_dev->has_manf_id ? p_dev->manf_id : 0,
 942                            p_dev->has_card_id ? p_dev->card_id : 0,
 943                            p_dev->has_func_id ? p_dev->func_id : 0,
 944                            p_dev->func,
 945                            p_dev->device_no,
 946                            hash[0],
 947                            hash[1],
 948                            hash[2],
 949                            hash[3]))
 950                 return -ENOMEM;
 951
 952         return 0;
 953 }
 954
 955 #else
 956
 957 static int pcmcia_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 958 {
 959         return -ENODEV;
 960 }
 961
 962 #endif
 963
 964 /************************ runtime PM support ***************************/
 965
 966 static int pcmcia_dev_suspend(struct device *dev, pm_message_t state);
 967 static int pcmcia_dev_resume(struct device *dev);
 968
 969 static int runtime_suspend(struct device *dev)
 970 {
 971         int rc;
 972
 973         device_lock(dev);
 974         rc = pcmcia_dev_suspend(dev, PMSG_SUSPEND);
 975         device_unlock(dev);
 976         return rc;
 977 }
 978
 979 static int runtime_resume(struct device *dev)
 980 {
 981         int rc;
 982
 983         device_lock(dev);
 984         rc = pcmcia_dev_resume(dev);
 985         device_unlock(dev);
 986         return rc;
 987 }
 988
 989 /************************ per-device sysfs output ***************************/
 990
 991 #define pcmcia_device_attr(field, test, format)                         \
 992 static ssize_t field##_show (struct device *dev, struct device_attribute *attr, char *buf)              \
 993 {                                                                       \
 994         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);               \
 995         return p_dev->test ? sprintf(buf, format, p_dev->field) : -ENODEV; \
 996 }
 997
 998 #define pcmcia_device_stringattr(name, field)                                   \
 999 static ssize_t name##_show (struct device *dev, struct device_attribute *attr, char *buf)               \
1000 {                                                                       \
1001         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);               \
1002         return p_dev->field ? sprintf(buf, "%s\n", p_dev->field) : -ENODEV; \
1003 }
1004
1005 pcmcia_device_attr(func, socket, "0x%02x\n");
1006 pcmcia_device_attr(func_id, has_func_id, "0x%02x\n");
1007 pcmcia_device_attr(manf_id, has_manf_id, "0x%04x\n");
1008 pcmcia_device_attr(card_id, has_card_id, "0x%04x\n");
1009 pcmcia_device_stringattr(prod_id1, prod_id[0]);
1010 pcmcia_device_stringattr(prod_id2, prod_id[1]);
1011 pcmcia_device_stringattr(prod_id3, prod_id[2]);
1012 pcmcia_device_stringattr(prod_id4, prod_id[3]);
1013
1014 static ssize_t pcmcia_show_resources(struct device *dev,
1015                                      struct device_attribute *attr, char *buf)
1016 {
1017         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1018         char *str = buf;
1019         int i;
1020
1021         for (i = 0; i < PCMCIA_NUM_RESOURCES; i++)
1022                 str += sprintf(str, "%pr\n", p_dev->resource[i]);
1023
1024         return str - buf;
1025 }
1026
1027 static ssize_t pcmcia_show_pm_state(struct device *dev, struct device_attribute *attr, char *buf)
1028 {
1029         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1030
1031         if (p_dev->suspended)
1032                 return sprintf(buf, "off\n");
1033         else
1034                 return sprintf(buf, "on\n");
1035 }
1036
1037 static ssize_t pcmcia_store_pm_state(struct device *dev, struct device_attribute *attr,
1038                                      const char *buf, size_t count)
1039 {
1040         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1041         int ret = 0;
1042
1043         if (!count)
1044                 return -EINVAL;
1045
1046         if ((!p_dev->suspended) && !strncmp(buf, "off", 3))
1047                 ret = runtime_suspend(dev);
1048         else if (p_dev->suspended && !strncmp(buf, "on", 2))
1049                 ret = runtime_resume(dev);
1050
1051         return ret ? ret : count;
1052 }
1053
1054
1055 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1056 {
1057         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1058         int i;
1059         u32 hash[4] = { 0, 0, 0, 0};
1060
1061         /* calculate hashes */
1062         for (i = 0; i < 4; i++) {
1063                 if (!p_dev->prod_id[i])
1064                         continue;
1065                 hash[i] = crc32(0, p_dev->prod_id[i],
1066                                 strlen(p_dev->prod_id[i]));
1067         }
1068         return sprintf(buf, "pcmcia:m%04Xc%04Xf%02Xfn%02Xpfn%02X"
1069                                 "pa%08Xpb%08Xpc%08Xpd%08X\n",
1070                                 p_dev->has_manf_id ? p_dev->manf_id : 0,
1071                                 p_dev->has_card_id ? p_dev->card_id : 0,
1072                                 p_dev->has_func_id ? p_dev->func_id : 0,
1073                                 p_dev->func, p_dev->device_no,
1074                                 hash[0], hash[1], hash[2], hash[3]);
1075 }
1076
1077 static ssize_t pcmcia_store_allow_func_id_match(struct device *dev,
1078                 struct device_attribute *attr, const char *buf, size_t count)
1079 {
1080         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1081
1082         if (!count)
1083                 return -EINVAL;
1084
1085         mutex_lock(&p_dev->socket->ops_mutex);
1086         p_dev->allow_func_id_match = 1;
1087         mutex_unlock(&p_dev->socket->ops_mutex);
1088         pcmcia_parse_uevents(p_dev->socket, PCMCIA_UEVENT_REQUERY);
1089
1090         return count;
1091 }
1092
1093 static struct device_attribute pcmcia_dev_attrs[] = {
1094         __ATTR(function, 0444, func_show, NULL),
1095         __ATTR(pm_state, 0644, pcmcia_show_pm_state, pcmcia_store_pm_state),
1096         __ATTR(resources, 0444, pcmcia_show_resources, NULL),
1097         __ATTR_RO(func_id),
1098         __ATTR_RO(manf_id),
1099         __ATTR_RO(card_id),
1100         __ATTR_RO(prod_id1),
1101         __ATTR_RO(prod_id2),
1102         __ATTR_RO(prod_id3),
1103         __ATTR_RO(prod_id4),
1104         __ATTR_RO(modalias),
1105         __ATTR(allow_func_id_match, 0200, NULL, pcmcia_store_allow_func_id_match),
1106         __ATTR_NULL,
1107 };
1108
1109 /* PM support, also needed for reset */
1110
1111 static int pcmcia_dev_suspend(struct device *dev, pm_message_t state)
1112 {
1113         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1114         struct pcmcia_driver *p_drv = NULL;
1115         int ret = 0;
1116
1117         mutex_lock(&p_dev->socket->ops_mutex);
1118         if (p_dev->suspended) {
1119                 mutex_unlock(&p_dev->socket->ops_mutex);
1120                 return 0;
1121         }
1122         p_dev->suspended = 1;
1123         mutex_unlock(&p_dev->socket->ops_mutex);
1124
1125         dev_dbg(dev, "suspending\n");
1126
1127         if (dev->driver)
1128                 p_drv = to_pcmcia_drv(dev->driver);
1129
1130         if (!p_drv)
1131                 goto out;
1132
1133         if (p_drv->suspend) {
1134                 ret = p_drv->suspend(p_dev);
1135                 if (ret) {
1136                         dev_printk(KERN_ERR, dev,
1137                                    "pcmcia: device %s (driver %s) did "
1138                                    "not want to go to sleep (%d)\n",
1139                                    p_dev->devname, p_drv->drv.name, ret);
1140                         mutex_lock(&p_dev->socket->ops_mutex);
1141                         p_dev->suspended = 0;
1142                         mutex_unlock(&p_dev->socket->ops_mutex);
1143                         goto out;
1144                 }
1145         }
1146
1147         if (p_dev->device_no == p_dev->func) {
1148                 dev_dbg(dev, "releasing configuration\n");
1149                 pcmcia_release_configuration(p_dev);
1150         }
1151
1152  out:
1153         return ret;
1154 }
1155
1156
1157 static int pcmcia_dev_resume(struct device *dev)
1158 {
1159         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1160         struct pcmcia_driver *p_drv = NULL;
1161         int ret = 0;
1162
1163         mutex_lock(&p_dev->socket->ops_mutex);
1164         if (!p_dev->suspended) {
1165                 mutex_unlock(&p_dev->socket->ops_mutex);
1166                 return 0;
1167         }
1168         p_dev->suspended = 0;
1169         mutex_unlock(&p_dev->socket->ops_mutex);
1170
1171         dev_dbg(dev, "resuming\n");
1172
1173         if (dev->driver)
1174                 p_drv = to_pcmcia_drv(dev->driver);
1175
1176         if (!p_drv)
1177                 goto out;
1178
1179         if (p_dev->device_no == p_dev->func) {
1180                 dev_dbg(dev, "requesting configuration\n");
1181                 ret = pcmcia_request_configuration(p_dev, &p_dev->conf);
1182                 if (ret)
1183                         goto out;
1184         }
1185
1186         if (p_drv->resume)
1187                 ret = p_drv->resume(p_dev);
1188
1189  out:
1190         return ret;
1191 }
1192
1193
1194 static int pcmcia_bus_suspend_callback(struct device *dev, void * _data)
1195 {
1196         struct pcmcia_socket *skt = _data;
1197         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1198
1199         if (p_dev->socket != skt || p_dev->suspended)
1200                 return 0;
1201
1202         return runtime_suspend(dev);
1203 }
1204
1205 static int pcmcia_bus_resume_callback(struct device *dev, void * _data)
1206 {
1207         struct pcmcia_socket *skt = _data;
1208         struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1209
1210         if (p_dev->socket != skt || !p_dev->suspended)
1211                 return 0;
1212
1213         runtime_resume(dev);
1214
1215         return 0;
1216 }
1217
1218 static int pcmcia_bus_resume(struct pcmcia_socket *skt)
1219 {
1220         dev_dbg(&skt->dev, "resuming socket %d\n", skt->sock);
1221         bus_for_each_dev(&pcmcia_bus_type, NULL, skt, pcmcia_bus_resume_callback);
1222         return 0;
1223 }
1224
1225 static int pcmcia_bus_suspend(struct pcmcia_socket *skt)
1226 {
1227         dev_dbg(&skt->dev, "suspending socket %d\n", skt->sock);
1228         if (bus_for_each_dev(&pcmcia_bus_type, NULL, skt,
1229                              pcmcia_bus_suspend_callback)) {
1230                 pcmcia_bus_resume(skt);
1231                 return -EIO;
1232         }
1233         return 0;
1234 }
1235
1236 static int pcmcia_bus_remove(struct pcmcia_socket *skt)
1237 {
1238         atomic_set(&skt->present, 0);
1239         pcmcia_card_remove(skt, NULL);
1240
1241         mutex_lock(&skt->ops_mutex);
1242         destroy_cis_cache(skt);
1243         pcmcia_cleanup_irq(skt);
1244         mutex_unlock(&skt->ops_mutex);
1245
1246         return 0;
1247 }
1248
1249 static int pcmcia_bus_add(struct pcmcia_socket *skt)
1250 {
1251         atomic_set(&skt->present, 1);
1252
1253         mutex_lock(&skt->ops_mutex);
1254         skt->pcmcia_pfc = 0;
1255         destroy_cis_cache(skt); /* to be on the safe side... */
1256         mutex_unlock(&skt->ops_mutex);
1257
1258         pcmcia_card_add(skt);
1259
1260         return 0;
1261 }
1262
1263 static int pcmcia_bus_early_resume(struct pcmcia_socket *skt)
1264 {
1265         if (!verify_cis_cache(skt)) {
1266                 pcmcia_put_socket(skt);
1267                 return 0;
1268         }
1269
1270         dev_dbg(&skt->dev, "cis mismatch - different card\n");
1271
1272         /* first, remove the card */
1273         pcmcia_bus_remove(skt);
1274
1275         mutex_lock(&skt->ops_mutex);
1276         destroy_cis_cache(skt);
1277         kfree(skt->fake_cis);
1278         skt->fake_cis = NULL;
1279         skt->functions = 0;
1280         mutex_unlock(&skt->ops_mutex);
1281
1282         /* now, add the new card */
1283         pcmcia_bus_add(skt);
1284         return 0;
1285 }
1286
1287
1288 /*
1289  * NOTE: This is racy. There's no guarantee the card will still be
1290  * physically present, even if the call to this function returns
1291  * non-NULL. Furthermore, the device driver most likely is unbound
1292  * almost immediately, so the timeframe where pcmcia_dev_present
1293  * returns NULL is probably really really small.
1294  */
1295 struct pcmcia_device *pcmcia_dev_present(struct pcmcia_device *_p_dev)
1296 {
1297         struct pcmcia_device *p_dev;
1298         struct pcmcia_device *ret = NULL;
1299
1300         p_dev = pcmcia_get_dev(_p_dev);
1301         if (!p_dev)
1302                 return NULL;
1303
1304         if (atomic_read(&p_dev->socket->present) != 0)
1305                 ret = p_dev;
1306
1307         pcmcia_put_dev(p_dev);
1308         return ret;
1309 }
1310 EXPORT_SYMBOL(pcmcia_dev_present);
1311
1312
1313 static struct pcmcia_callback pcmcia_bus_callback = {
1314         .owner = THIS_MODULE,
1315         .add = pcmcia_bus_add,
1316         .remove = pcmcia_bus_remove,
1317         .requery = pcmcia_requery,
1318         .validate = pccard_validate_cis,
1319         .suspend = pcmcia_bus_suspend,
1320         .early_resume = pcmcia_bus_early_resume,
1321         .resume = pcmcia_bus_resume,
1322 };
1323
1324 static int __devinit pcmcia_bus_add_socket(struct device *dev,
1325                                            struct class_interface *class_intf)
1326 {
1327         struct pcmcia_socket *socket = dev_get_drvdata(dev);
1328         int ret;
1329
1330         socket = pcmcia_get_socket(socket);
1331         if (!socket) {
1332                 dev_printk(KERN_ERR, dev,
1333                            "PCMCIA obtaining reference to socket failed\n");
1334                 return -ENODEV;
1335         }
1336
1337         ret = sysfs_create_bin_file(&dev->kobj, &pccard_cis_attr);
1338         if (ret) {
1339                 dev_printk(KERN_ERR, dev, "PCMCIA registration failed\n");
1340                 pcmcia_put_socket(socket);
1341                 return ret;
1342         }
1343
1344         INIT_LIST_HEAD(&socket->devices_list);
1345         socket->pcmcia_pfc = 0;
1346         socket->device_count = 0;
1347         atomic_set(&socket->present, 0);
1348
1349         ret = pccard_register_pcmcia(socket, &pcmcia_bus_callback);
1350         if (ret) {
1351                 dev_printk(KERN_ERR, dev, "PCMCIA registration failed\n");
1352                 pcmcia_put_socket(socket);
1353                 return ret;
1354         }
1355
1356         return 0;
1357 }
1358
1359 static void pcmcia_bus_remove_socket(struct device *dev,
1360                                      struct class_interface *class_intf)
1361 {
1362         struct pcmcia_socket *socket = dev_get_drvdata(dev);
1363
1364         if (!socket)
1365                 return;
1366
1367         pccard_register_pcmcia(socket, NULL);
1368
1369         /* unregister any unbound devices */
1370         mutex_lock(&socket->skt_mutex);
1371         pcmcia_card_remove(socket, NULL);
1372         release_cis_mem(socket);
1373         mutex_unlock(&socket->skt_mutex);
1374
1375         sysfs_remove_bin_file(&dev->kobj, &pccard_cis_attr);
1376
1377         pcmcia_put_socket(socket);
1378
1379         return;
1380 }
1381
1382
1383 /* the pcmcia_bus_interface is used to handle pcmcia socket devices */
1384 static struct class_interface pcmcia_bus_interface __refdata = {
1385         .class = &pcmcia_socket_class,
1386         .add_dev = &pcmcia_bus_add_socket,
1387         .remove_dev = &pcmcia_bus_remove_socket,
1388 };
1389
1390
1391 struct bus_type pcmcia_bus_type = {
1392         .name = "pcmcia",
1393         .uevent = pcmcia_bus_uevent,
1394         .match = pcmcia_bus_match,
1395         .dev_attrs = pcmcia_dev_attrs,
1396         .probe = pcmcia_device_probe,
1397         .remove = pcmcia_device_remove,
1398         .suspend = pcmcia_dev_suspend,
1399         .resume = pcmcia_dev_resume,
1400 };
1401
1402
1403 static int __init init_pcmcia_bus(void)
1404 {
1405         int ret;
1406
1407         ret = bus_register(&pcmcia_bus_type);
1408         if (ret < 0) {
1409                 printk(KERN_WARNING "pcmcia: bus_register error: %d\n", ret);
1410                 return ret;
1411         }
1412         ret = class_interface_register(&pcmcia_bus_interface);
1413         if (ret < 0) {
1414                 printk(KERN_WARNING
1415                         "pcmcia: class_interface_register error: %d\n", ret);
1416                 bus_unregister(&pcmcia_bus_type);
1417                 return ret;
1418         }
1419
1420         return 0;
1421 }
1422 fs_initcall(init_pcmcia_bus); /* one level after subsys_initcall so that
1423                                * pcmcia_socket_class is already registered */
1424
1425
1426 static void __exit exit_pcmcia_bus(void)
1427 {
1428         class_interface_unregister(&pcmcia_bus_interface);
1429
1430         bus_unregister(&pcmcia_bus_type);
1431 }
1432 module_exit(exit_pcmcia_bus);
1433
1434
1435 MODULE_ALIAS("ds");