drivers/acpi/scan.c

   1 /*
   2  * scan.c - support for transforming the ACPI namespace into individual objects
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/init.h>
   7 #include <linux/slab.h>
   8 #include <linux/kernel.h>
   9 #include <linux/acpi.h>
  10 #include <linux/signal.h>
  11 #include <linux/kthread.h>
  12 #include <linux/dmi.h>
  13 #include <linux/nls.h>
  14
  15 #include <asm/pgtable.h>
  16
  17 #include "internal.h"
  18
  19 #define _COMPONENT              ACPI_BUS_COMPONENT
  20 ACPI_MODULE_NAME("scan");
  21 extern struct acpi_device *acpi_root;
  22
  23 #define ACPI_BUS_CLASS                  "system_bus"
  24 #define ACPI_BUS_HID                    "LNXSYBUS"
  25 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  26
  27 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  28
  29 #define INVALID_ACPI_HANDLE     ((acpi_handle)empty_zero_page)
  30
  31 /*
  32  * If set, devices will be hot-removed even if they cannot be put offline
  33  * gracefully (from the kernel's standpoint).
  34  */
  35 bool acpi_force_hot_remove;
  36
  37 static const char *dummy_hid = "device";
  38
  39 static LIST_HEAD(acpi_dep_list);
  40 static DEFINE_MUTEX(acpi_dep_list_lock);
  41 static LIST_HEAD(acpi_bus_id_list);
  42 static DEFINE_MUTEX(acpi_scan_lock);
  43 static LIST_HEAD(acpi_scan_handlers_list);
  44 DEFINE_MUTEX(acpi_device_lock);
  45 LIST_HEAD(acpi_wakeup_device_list);
  46 static DEFINE_MUTEX(acpi_hp_context_lock);
  47
  48 struct acpi_dep_data {
  49         struct list_head node;
  50         acpi_handle master;
  51         acpi_handle slave;
  52 };
  53
  54 struct acpi_device_bus_id{
  55         char bus_id[15];
  56         unsigned int instance_no;
  57         struct list_head node;
  58 };
  59
  60 void acpi_scan_lock_acquire(void)
  61 {
  62         mutex_lock(&acpi_scan_lock);
  63 }
  64 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  65
  66 void acpi_scan_lock_release(void)
  67 {
  68         mutex_unlock(&acpi_scan_lock);
  69 }
  70 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  71
  72 void acpi_lock_hp_context(void)
  73 {
  74         mutex_lock(&acpi_hp_context_lock);
  75 }
  76
  77 void acpi_unlock_hp_context(void)
  78 {
  79         mutex_unlock(&acpi_hp_context_lock);
  80 }
  81
  82 void acpi_initialize_hp_context(struct acpi_device *adev,
  83                                 struct acpi_hotplug_context *hp,
  84                                 int (*notify)(struct acpi_device *, u32),
  85                                 void (*uevent)(struct acpi_device *, u32))
  86 {
  87         acpi_lock_hp_context();
  88         hp->notify = notify;
  89         hp->uevent = uevent;
  90         acpi_set_hp_context(adev, hp);
  91         acpi_unlock_hp_context();
  92 }
  93 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
  94
  95 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  96 {
  97         if (!handler)
  98                 return -EINVAL;
  99
 100         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
 101         return 0;
 102 }
 103
 104 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
 105                                        const char *hotplug_profile_name)
 106 {
 107         int error;
 108
 109         error = acpi_scan_add_handler(handler);
 110         if (error)
 111                 return error;
 112
 113         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
 114         return 0;
 115 }
 116
 117 /*
 118  * Creates hid/cid(s) string needed for modalias and uevent
 119  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
 120  * char *modalias: "acpi:IBM0001:ACPI0001"
 121  * Return: 0: no _HID and no _CID
 122  *         -EINVAL: output error
 123  *         -ENOMEM: output is truncated
 124 */
 125 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
 126                            int size)
 127 {
 128         int len;
 129         int count;
 130         struct acpi_hardware_id *id;
 131
 132         if (list_empty(&acpi_dev->pnp.ids))
 133                 return 0;
 134
 135         len = snprintf(modalias, size, "acpi:");
 136         size -= len;
 137
 138         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
 139                 count = snprintf(&modalias[len], size, "%s:", id->id);
 140                 if (count < 0)
 141                         return -EINVAL;
 142                 if (count >= size)
 143                         return -ENOMEM;
 144                 len += count;
 145                 size -= count;
 146         }
 147
 148         modalias[len] = '\0';
 149         return len;
 150 }
 151
 152 /*
 153  * acpi_companion_match() - Can we match via ACPI companion device
 154  * @dev: Device in question
 155  *
 156  * Check if the given device has an ACPI companion and if that companion has
 157  * a valid list of PNP IDs, and if the device is the first (primary) physical
 158  * device associated with it.
 159  *
 160  * If multiple physical devices are attached to a single ACPI companion, we need
 161  * to be careful.  The usage scenario for this kind of relationship is that all
 162  * of the physical devices in question use resources provided by the ACPI
 163  * companion.  A typical case is an MFD device where all the sub-devices share
 164  * the parent's ACPI companion.  In such cases we can only allow the primary
 165  * (first) physical device to be matched with the help of the companion's PNP
 166  * IDs.
 167  *
 168  * Additional physical devices sharing the ACPI companion can still use
 169  * resources available from it but they will be matched normally using functions
 170  * provided by their bus types (and analogously for their modalias).
 171  */
 172 static bool acpi_companion_match(const struct device *dev)
 173 {
 174         struct acpi_device *adev;
 175         bool ret;
 176
 177         adev = ACPI_COMPANION(dev);
 178         if (!adev)
 179                 return false;
 180
 181         if (list_empty(&adev->pnp.ids))
 182                 return false;
 183
 184         mutex_lock(&adev->physical_node_lock);
 185         if (list_empty(&adev->physical_node_list)) {
 186                 ret = false;
 187         } else {
 188                 const struct acpi_device_physical_node *node;
 189
 190                 node = list_first_entry(&adev->physical_node_list,
 191                                         struct acpi_device_physical_node, node);
 192                 ret = node->dev == dev;
 193         }
 194         mutex_unlock(&adev->physical_node_lock);
 195
 196         return ret;
 197 }
 198
 199 /*
 200  * Creates uevent modalias field for ACPI enumerated devices.
 201  * Because the other buses does not support ACPI HIDs & CIDs.
 202  * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
 203  * "acpi:IBM0001:ACPI0001"
 204  */
 205 int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
 206 {
 207         int len;
 208
 209         if (!acpi_companion_match(dev))
 210                 return -ENODEV;
 211
 212         if (add_uevent_var(env, "MODALIAS="))
 213                 return -ENOMEM;
 214         len = create_modalias(ACPI_COMPANION(dev), &env->buf[env->buflen - 1],
 215                                 sizeof(env->buf) - env->buflen);
 216         if (len <= 0)
 217                 return len;
 218         env->buflen += len;
 219         return 0;
 220 }
 221 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
 222
 223 /*
 224  * Creates modalias sysfs attribute for ACPI enumerated devices.
 225  * Because the other buses does not support ACPI HIDs & CIDs.
 226  * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
 227  * "acpi:IBM0001:ACPI0001"
 228  */
 229 int acpi_device_modalias(struct device *dev, char *buf, int size)
 230 {
 231         int len;
 232
 233         if (!acpi_companion_match(dev))
 234                 return -ENODEV;
 235
 236         len = create_modalias(ACPI_COMPANION(dev), buf, size -1);
 237         if (len <= 0)
 238                 return len;
 239         buf[len++] = '\n';
 240         return len;
 241 }
 242 EXPORT_SYMBOL_GPL(acpi_device_modalias);
 243
 244 static ssize_t
 245 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
 246         struct acpi_device *acpi_dev = to_acpi_device(dev);
 247         int len;
 248
 249         len = create_modalias(acpi_dev, buf, 1024);
 250         if (len <= 0)
 251                 return len;
 252         buf[len++] = '\n';
 253         return len;
 254 }
 255 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 256
 257 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 258 {
 259         struct acpi_device_physical_node *pn;
 260         bool offline = true;
 261
 262         mutex_lock(&adev->physical_node_lock);
 263
 264         list_for_each_entry(pn, &adev->physical_node_list, node)
 265                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
 266                         if (uevent)
 267                                 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
 268
 269                         offline = false;
 270                         break;
 271                 }
 272
 273         mutex_unlock(&adev->physical_node_lock);
 274         return offline;
 275 }
 276
 277 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 278                                     void **ret_p)
 279 {
 280         struct acpi_device *device = NULL;
 281         struct acpi_device_physical_node *pn;
 282         bool second_pass = (bool)data;
 283         acpi_status status = AE_OK;
 284
 285         if (acpi_bus_get_device(handle, &device))
 286                 return AE_OK;
 287
 288         if (device->handler && !device->handler->hotplug.enabled) {
 289                 *ret_p = &device->dev;
 290                 return AE_SUPPORT;
 291         }
 292
 293         mutex_lock(&device->physical_node_lock);
 294
 295         list_for_each_entry(pn, &device->physical_node_list, node) {
 296                 int ret;
 297
 298                 if (second_pass) {
 299                         /* Skip devices offlined by the first pass. */
 300                         if (pn->put_online)
 301                                 continue;
 302                 } else {
 303                         pn->put_online = false;
 304                 }
 305                 ret = device_offline(pn->dev);
 306                 if (acpi_force_hot_remove)
 307                         continue;
 308
 309                 if (ret >= 0) {
 310                         pn->put_online = !ret;
 311                 } else {
 312                         *ret_p = pn->dev;
 313                         if (second_pass) {
 314                                 status = AE_ERROR;
 315                                 break;
 316                         }
 317                 }
 318         }
 319
 320         mutex_unlock(&device->physical_node_lock);
 321
 322         return status;
 323 }
 324
 325 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 326                                    void **ret_p)
 327 {
 328         struct acpi_device *device = NULL;
 329         struct acpi_device_physical_node *pn;
 330
 331         if (acpi_bus_get_device(handle, &device))
 332                 return AE_OK;
 333
 334         mutex_lock(&device->physical_node_lock);
 335
 336         list_for_each_entry(pn, &device->physical_node_list, node)
 337                 if (pn->put_online) {
 338                         device_online(pn->dev);
 339                         pn->put_online = false;
 340                 }
 341
 342         mutex_unlock(&device->physical_node_lock);
 343
 344         return AE_OK;
 345 }
 346
 347 static int acpi_scan_try_to_offline(struct acpi_device *device)
 348 {
 349         acpi_handle handle = device->handle;
 350         struct device *errdev = NULL;
 351         acpi_status status;
 352
 353         /*
 354          * Carry out two passes here and ignore errors in the first pass,
 355          * because if the devices in question are memory blocks and
 356          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 357          * that the other blocks depend on, but it is not known in advance which
 358          * block holds them.
 359          *
 360          * If the first pass is successful, the second one isn't needed, though.
 361          */
 362         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 363                                      NULL, acpi_bus_offline, (void *)false,
 364                                      (void **)&errdev);
 365         if (status == AE_SUPPORT) {
 366                 dev_warn(errdev, "Offline disabled.\n");
 367                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 368                                     acpi_bus_online, NULL, NULL, NULL);
 369                 return -EPERM;
 370         }
 371         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
 372         if (errdev) {
 373                 errdev = NULL;
 374                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 375                                     NULL, acpi_bus_offline, (void *)true,
 376                                     (void **)&errdev);
 377                 if (!errdev || acpi_force_hot_remove)
 378                         acpi_bus_offline(handle, 0, (void *)true,
 379                                          (void **)&errdev);
 380
 381                 if (errdev && !acpi_force_hot_remove) {
 382                         dev_warn(errdev, "Offline failed.\n");
 383                         acpi_bus_online(handle, 0, NULL, NULL);
 384                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 385                                             ACPI_UINT32_MAX, acpi_bus_online,
 386                                             NULL, NULL, NULL);
 387                         return -EBUSY;
 388                 }
 389         }
 390         return 0;
 391 }
 392
 393 static int acpi_scan_hot_remove(struct acpi_device *device)
 394 {
 395         acpi_handle handle = device->handle;
 396         unsigned long long sta;
 397         acpi_status status;
 398
 399         if (device->handler && device->handler->hotplug.demand_offline
 400             && !acpi_force_hot_remove) {
 401                 if (!acpi_scan_is_offline(device, true))
 402                         return -EBUSY;
 403         } else {
 404                 int error = acpi_scan_try_to_offline(device);
 405                 if (error)
 406                         return error;
 407         }
 408
 409         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 410                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 411
 412         acpi_bus_trim(device);
 413
 414         acpi_evaluate_lck(handle, 0);
 415         /*
 416          * TBD: _EJD support.
 417          */
 418         status = acpi_evaluate_ej0(handle);
 419         if (status == AE_NOT_FOUND)
 420                 return -ENODEV;
 421         else if (ACPI_FAILURE(status))
 422                 return -EIO;
 423
 424         /*
 425          * Verify if eject was indeed successful.  If not, log an error
 426          * message.  No need to call _OST since _EJ0 call was made OK.
 427          */
 428         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 429         if (ACPI_FAILURE(status)) {
 430                 acpi_handle_warn(handle,
 431                         "Status check after eject failed (0x%x)\n", status);
 432         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 433                 acpi_handle_warn(handle,
 434                         "Eject incomplete - status 0x%llx\n", sta);
 435         }
 436
 437         return 0;
 438 }
 439
 440 static int acpi_scan_device_not_present(struct acpi_device *adev)
 441 {
 442         if (!acpi_device_enumerated(adev)) {
 443                 dev_warn(&adev->dev, "Still not present\n");
 444                 return -EALREADY;
 445         }
 446         acpi_bus_trim(adev);
 447         return 0;
 448 }
 449
 450 static int acpi_scan_device_check(struct acpi_device *adev)
 451 {
 452         int error;
 453
 454         acpi_bus_get_status(adev);
 455         if (adev->status.present || adev->status.functional) {
 456                 /*
 457                  * This function is only called for device objects for which
 458                  * matching scan handlers exist.  The only situation in which
 459                  * the scan handler is not attached to this device object yet
 460                  * is when the device has just appeared (either it wasn't
 461                  * present at all before or it was removed and then added
 462                  * again).
 463                  */
 464                 if (adev->handler) {
 465                         dev_warn(&adev->dev, "Already enumerated\n");
 466                         return -EALREADY;
 467                 }
 468                 error = acpi_bus_scan(adev->handle);
 469                 if (error) {
 470                         dev_warn(&adev->dev, "Namespace scan failure\n");
 471                         return error;
 472                 }
 473                 if (!adev->handler) {
 474                         dev_warn(&adev->dev, "Enumeration failure\n");
 475                         error = -ENODEV;
 476                 }
 477         } else {
 478                 error = acpi_scan_device_not_present(adev);
 479         }
 480         return error;
 481 }
 482
 483 static int acpi_scan_bus_check(struct acpi_device *adev)
 484 {
 485         struct acpi_scan_handler *handler = adev->handler;
 486         struct acpi_device *child;
 487         int error;
 488
 489         acpi_bus_get_status(adev);
 490         if (!(adev->status.present || adev->status.functional)) {
 491                 acpi_scan_device_not_present(adev);
 492                 return 0;
 493         }
 494         if (handler && handler->hotplug.scan_dependent)
 495                 return handler->hotplug.scan_dependent(adev);
 496
 497         error = acpi_bus_scan(adev->handle);
 498         if (error) {
 499                 dev_warn(&adev->dev, "Namespace scan failure\n");
 500                 return error;
 501         }
 502         list_for_each_entry(child, &adev->children, node) {
 503                 error = acpi_scan_bus_check(child);
 504                 if (error)
 505                         return error;
 506         }
 507         return 0;
 508 }
 509
 510 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 511 {
 512         switch (type) {
 513         case ACPI_NOTIFY_BUS_CHECK:
 514                 return acpi_scan_bus_check(adev);
 515         case ACPI_NOTIFY_DEVICE_CHECK:
 516                 return acpi_scan_device_check(adev);
 517         case ACPI_NOTIFY_EJECT_REQUEST:
 518         case ACPI_OST_EC_OSPM_EJECT:
 519                 if (adev->handler && !adev->handler->hotplug.enabled) {
 520                         dev_info(&adev->dev, "Eject disabled\n");
 521                         return -EPERM;
 522                 }
 523                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 524                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 525                 return acpi_scan_hot_remove(adev);
 526         }
 527         return -EINVAL;
 528 }
 529
 530 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 531 {
 532         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 533         int error = -ENODEV;
 534
 535         lock_device_hotplug();
 536         mutex_lock(&acpi_scan_lock);
 537
 538         /*
 539          * The device object's ACPI handle cannot become invalid as long as we
 540          * are holding acpi_scan_lock, but it might have become invalid before
 541          * that lock was acquired.
 542          */
 543         if (adev->handle == INVALID_ACPI_HANDLE)
 544                 goto err_out;
 545
 546         if (adev->flags.is_dock_station) {
 547                 error = dock_notify(adev, src);
 548         } else if (adev->flags.hotplug_notify) {
 549                 error = acpi_generic_hotplug_event(adev, src);
 550                 if (error == -EPERM) {
 551                         ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 552                         goto err_out;
 553                 }
 554         } else {
 555                 int (*notify)(struct acpi_device *, u32);
 556
 557                 acpi_lock_hp_context();
 558                 notify = adev->hp ? adev->hp->notify : NULL;
 559                 acpi_unlock_hp_context();
 560                 /*
 561                  * There may be additional notify handlers for device objects
 562                  * without the .event() callback, so ignore them here.
 563                  */
 564                 if (notify)
 565                         error = notify(adev, src);
 566                 else
 567                         goto out;
 568         }
 569         if (!error)
 570                 ost_code = ACPI_OST_SC_SUCCESS;
 571
 572  err_out:
 573         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 574
 575  out:
 576         acpi_bus_put_acpi_device(adev);
 577         mutex_unlock(&acpi_scan_lock);
 578         unlock_device_hotplug();
 579 }
 580
 581 static ssize_t real_power_state_show(struct device *dev,
 582                                      struct device_attribute *attr, char *buf)
 583 {
 584         struct acpi_device *adev = to_acpi_device(dev);
 585         int state;
 586         int ret;
 587
 588         ret = acpi_device_get_power(adev, &state);
 589         if (ret)
 590                 return ret;
 591
 592         return sprintf(buf, "%s\n", acpi_power_state_string(state));
 593 }
 594
 595 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 596
 597 static ssize_t power_state_show(struct device *dev,
 598                                 struct device_attribute *attr, char *buf)
 599 {
 600         struct acpi_device *adev = to_acpi_device(dev);
 601
 602         return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 603 }
 604
 605 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 606
 607 static ssize_t
 608 acpi_eject_store(struct device *d, struct device_attribute *attr,
 609                 const char *buf, size_t count)
 610 {
 611         struct acpi_device *acpi_device = to_acpi_device(d);
 612         acpi_object_type not_used;
 613         acpi_status status;
 614
 615         if (!count || buf[0] != '1')
 616                 return -EINVAL;
 617
 618         if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
 619             && !acpi_device->driver)
 620                 return -ENODEV;
 621
 622         status = acpi_get_type(acpi_device->handle, &not_used);
 623         if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
 624                 return -ENODEV;
 625
 626         get_device(&acpi_device->dev);
 627         status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
 628         if (ACPI_SUCCESS(status))
 629                 return count;
 630
 631         put_device(&acpi_device->dev);
 632         acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
 633                           ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 634         return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
 635 }
 636
 637 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 638
 639 static ssize_t
 640 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 641         struct acpi_device *acpi_dev = to_acpi_device(dev);
 642
 643         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 644 }
 645 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 646
 647 static ssize_t acpi_device_uid_show(struct device *dev,
 648                                     struct device_attribute *attr, char *buf)
 649 {
 650         struct acpi_device *acpi_dev = to_acpi_device(dev);
 651
 652         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 653 }
 654 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 655
 656 static ssize_t acpi_device_adr_show(struct device *dev,
 657                                     struct device_attribute *attr, char *buf)
 658 {
 659         struct acpi_device *acpi_dev = to_acpi_device(dev);
 660
 661         return sprintf(buf, "0x%08x\n",
 662                        (unsigned int)(acpi_dev->pnp.bus_address));
 663 }
 664 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 665
 666 static ssize_t
 667 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 668         struct acpi_device *acpi_dev = to_acpi_device(dev);
 669         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 670         int result;
 671
 672         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 673         if (result)
 674                 goto end;
 675
 676         result = sprintf(buf, "%s\n", (char*)path.pointer);
 677         kfree(path.pointer);
 678 end:
 679         return result;
 680 }
 681 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 682
 683 /* sysfs file that shows description text from the ACPI _STR method */
 684 static ssize_t description_show(struct device *dev,
 685                                 struct device_attribute *attr,
 686                                 char *buf) {
 687         struct acpi_device *acpi_dev = to_acpi_device(dev);
 688         int result;
 689
 690         if (acpi_dev->pnp.str_obj == NULL)
 691                 return 0;
 692
 693         /*
 694          * The _STR object contains a Unicode identifier for a device.
 695          * We need to convert to utf-8 so it can be displayed.
 696          */
 697         result = utf16s_to_utf8s(
 698                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 699                 acpi_dev->pnp.str_obj->buffer.length,
 700                 UTF16_LITTLE_ENDIAN, buf,
 701                 PAGE_SIZE);
 702
 703         buf[result++] = '\n';
 704
 705         return result;
 706 }
 707 static DEVICE_ATTR(description, 0444, description_show, NULL);
 708
 709 static ssize_t
 710 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 711                      char *buf) {
 712         struct acpi_device *acpi_dev = to_acpi_device(dev);
 713         acpi_status status;
 714         unsigned long long sun;
 715
 716         status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun);
 717         if (ACPI_FAILURE(status))
 718                 return -ENODEV;
 719
 720         return sprintf(buf, "%llu\n", sun);
 721 }
 722 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 723
 724 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
 725                                 char *buf) {
 726         struct acpi_device *acpi_dev = to_acpi_device(dev);
 727         acpi_status status;
 728         unsigned long long sta;
 729
 730         status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
 731         if (ACPI_FAILURE(status))
 732                 return -ENODEV;
 733
 734         return sprintf(buf, "%llu\n", sta);
 735 }
 736 static DEVICE_ATTR_RO(status);
 737
 738 static int acpi_device_setup_files(struct acpi_device *dev)
 739 {
 740         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 741         acpi_status status;
 742         int result = 0;
 743
 744         /*
 745          * Devices gotten from FADT don't have a "path" attribute
 746          */
 747         if (dev->handle) {
 748                 result = device_create_file(&dev->dev, &dev_attr_path);
 749                 if (result)
 750                         goto end;
 751         }
 752
 753         if (!list_empty(&dev->pnp.ids)) {
 754                 result = device_create_file(&dev->dev, &dev_attr_hid);
 755                 if (result)
 756                         goto end;
 757
 758                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 759                 if (result)
 760                         goto end;
 761         }
 762
 763         /*
 764          * If device has _STR, 'description' file is created
 765          */
 766         if (acpi_has_method(dev->handle, "_STR")) {
 767                 status = acpi_evaluate_object(dev->handle, "_STR",
 768                                         NULL, &buffer);
 769                 if (ACPI_FAILURE(status))
 770                         buffer.pointer = NULL;
 771                 dev->pnp.str_obj = buffer.pointer;
 772                 result = device_create_file(&dev->dev, &dev_attr_description);
 773                 if (result)
 774                         goto end;
 775         }
 776
 777         if (dev->pnp.type.bus_address)
 778                 result = device_create_file(&dev->dev, &dev_attr_adr);
 779         if (dev->pnp.unique_id)
 780                 result = device_create_file(&dev->dev, &dev_attr_uid);
 781
 782         if (acpi_has_method(dev->handle, "_SUN")) {
 783                 result = device_create_file(&dev->dev, &dev_attr_sun);
 784                 if (result)
 785                         goto end;
 786         }
 787
 788         if (acpi_has_method(dev->handle, "_STA")) {
 789                 result = device_create_file(&dev->dev, &dev_attr_status);
 790                 if (result)
 791                         goto end;
 792         }
 793
 794         /*
 795          * If device has _EJ0, 'eject' file is created that is used to trigger
 796          * hot-removal function from userland.
 797          */
 798         if (acpi_has_method(dev->handle, "_EJ0")) {
 799                 result = device_create_file(&dev->dev, &dev_attr_eject);
 800                 if (result)
 801                         return result;
 802         }
 803
 804         if (dev->flags.power_manageable) {
 805                 result = device_create_file(&dev->dev, &dev_attr_power_state);
 806                 if (result)
 807                         return result;
 808
 809                 if (dev->power.flags.power_resources)
 810                         result = device_create_file(&dev->dev,
 811                                                     &dev_attr_real_power_state);
 812         }
 813
 814 end:
 815         return result;
 816 }
 817
 818 static void acpi_device_remove_files(struct acpi_device *dev)
 819 {
 820         if (dev->flags.power_manageable) {
 821                 device_remove_file(&dev->dev, &dev_attr_power_state);
 822                 if (dev->power.flags.power_resources)
 823                         device_remove_file(&dev->dev,
 824                                            &dev_attr_real_power_state);
 825         }
 826
 827         /*
 828          * If device has _STR, remove 'description' file
 829          */
 830         if (acpi_has_method(dev->handle, "_STR")) {
 831                 kfree(dev->pnp.str_obj);
 832                 device_remove_file(&dev->dev, &dev_attr_description);
 833         }
 834         /*
 835          * If device has _EJ0, remove 'eject' file.
 836          */
 837         if (acpi_has_method(dev->handle, "_EJ0"))
 838                 device_remove_file(&dev->dev, &dev_attr_eject);
 839
 840         if (acpi_has_method(dev->handle, "_SUN"))
 841                 device_remove_file(&dev->dev, &dev_attr_sun);
 842
 843         if (dev->pnp.unique_id)
 844                 device_remove_file(&dev->dev, &dev_attr_uid);
 845         if (dev->pnp.type.bus_address)
 846                 device_remove_file(&dev->dev, &dev_attr_adr);
 847         device_remove_file(&dev->dev, &dev_attr_modalias);
 848         device_remove_file(&dev->dev, &dev_attr_hid);
 849         if (acpi_has_method(dev->handle, "_STA"))
 850                 device_remove_file(&dev->dev, &dev_attr_status);
 851         if (dev->handle)
 852                 device_remove_file(&dev->dev, &dev_attr_path);
 853 }
 854 /* --------------------------------------------------------------------------
 855                         ACPI Bus operations
 856    -------------------------------------------------------------------------- */
 857
 858 static const struct acpi_device_id *__acpi_match_device(
 859         struct acpi_device *device, const struct acpi_device_id *ids)
 860 {
 861         const struct acpi_device_id *id;
 862         struct acpi_hardware_id *hwid;
 863
 864         /*
 865          * If the device is not present, it is unnecessary to load device
 866          * driver for it.
 867          */
 868         if (!device->status.present)
 869                 return NULL;
 870
 871         for (id = ids; id->id[0]; id++)
 872                 list_for_each_entry(hwid, &device->pnp.ids, list)
 873                         if (!strcmp((char *) id->id, hwid->id))
 874                                 return id;
 875
 876         return NULL;
 877 }
 878
 879 /**
 880  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 881  * @ids: Array of struct acpi_device_id object to match against.
 882  * @dev: The device structure to match.
 883  *
 884  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 885  * object for that handle and use that object to match against a given list of
 886  * device IDs.
 887  *
 888  * Return a pointer to the first matching ID on success or %NULL on failure.
 889  */
 890 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 891                                                const struct device *dev)
 892 {
 893         struct acpi_device *adev;
 894         acpi_handle handle = ACPI_HANDLE(dev);
 895
 896         if (!ids || !handle || acpi_bus_get_device(handle, &adev))
 897                 return NULL;
 898
 899         if (!acpi_companion_match(dev))
 900                 return NULL;
 901
 902         return __acpi_match_device(adev, ids);
 903 }
 904 EXPORT_SYMBOL_GPL(acpi_match_device);
 905
 906 int acpi_match_device_ids(struct acpi_device *device,
 907                           const struct acpi_device_id *ids)
 908 {
 909         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 910 }
 911 EXPORT_SYMBOL(acpi_match_device_ids);
 912
 913 static void acpi_free_power_resources_lists(struct acpi_device *device)
 914 {
 915         int i;
 916
 917         if (device->wakeup.flags.valid)
 918                 acpi_power_resources_list_free(&device->wakeup.resources);
 919
 920         if (!device->flags.power_manageable)
 921                 return;
 922
 923         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 924                 struct acpi_device_power_state *ps = &device->power.states[i];
 925                 acpi_power_resources_list_free(&ps->resources);
 926         }
 927 }
 928
 929 static void acpi_device_release(struct device *dev)
 930 {
 931         struct acpi_device *acpi_dev = to_acpi_device(dev);
 932
 933         acpi_free_pnp_ids(&acpi_dev->pnp);
 934         acpi_free_power_resources_lists(acpi_dev);
 935         kfree(acpi_dev);
 936 }
 937
 938 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 939 {
 940         struct acpi_device *acpi_dev = to_acpi_device(dev);
 941         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 942
 943         return acpi_dev->flags.match_driver
 944                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 945 }
 946
 947 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 948 {
 949         struct acpi_device *acpi_dev = to_acpi_device(dev);
 950         int len;
 951
 952         if (list_empty(&acpi_dev->pnp.ids))
 953                 return 0;
 954
 955         if (add_uevent_var(env, "MODALIAS="))
 956                 return -ENOMEM;
 957         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 958                               sizeof(env->buf) - env->buflen);
 959         if (len <= 0)
 960                 return len;
 961         env->buflen += len;
 962         return 0;
 963 }
 964
 965 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 966 {
 967         struct acpi_device *device = data;
 968
 969         device->driver->ops.notify(device, event);
 970 }
 971
 972 static void acpi_device_notify_fixed(void *data)
 973 {
 974         struct acpi_device *device = data;
 975
 976         /* Fixed hardware devices have no handles */
 977         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 978 }
 979
 980 static acpi_status acpi_device_fixed_event(void *data)
 981 {
 982         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
 983         return AE_OK;
 984 }
 985
 986 static int acpi_device_install_notify_handler(struct acpi_device *device)
 987 {
 988         acpi_status status;
 989
 990         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 991                 status =
 992                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 993                                                      acpi_device_fixed_event,
 994                                                      device);
 995         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 996                 status =
 997                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 998                                                      acpi_device_fixed_event,
 999                                                      device);
1000         else
1001                 status = acpi_install_notify_handler(device->handle,
1002                                                      ACPI_DEVICE_NOTIFY,
1003                                                      acpi_device_notify,
1004                                                      device);
1005
1006         if (ACPI_FAILURE(status))
1007                 return -EINVAL;
1008         return 0;
1009 }
1010
1011 static void acpi_device_remove_notify_handler(struct acpi_device *device)
1012 {
1013         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
1014                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
1015                                                 acpi_device_fixed_event);
1016         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
1017                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
1018                                                 acpi_device_fixed_event);
1019         else
1020                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1021                                            acpi_device_notify);
1022 }
1023
1024 static int acpi_device_probe(struct device *dev)
1025 {
1026         struct acpi_device *acpi_dev = to_acpi_device(dev);
1027         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1028         int ret;
1029
1030         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1031                 return -EINVAL;
1032
1033         if (!acpi_drv->ops.add)
1034                 return -ENOSYS;
1035
1036         ret = acpi_drv->ops.add(acpi_dev);
1037         if (ret)
1038                 return ret;
1039
1040         acpi_dev->driver = acpi_drv;
1041         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1042                           "Driver [%s] successfully bound to device [%s]\n",
1043                           acpi_drv->name, acpi_dev->pnp.bus_id));
1044
1045         if (acpi_drv->ops.notify) {
1046                 ret = acpi_device_install_notify_handler(acpi_dev);
1047                 if (ret) {
1048                         if (acpi_drv->ops.remove)
1049                                 acpi_drv->ops.remove(acpi_dev);
1050
1051                         acpi_dev->driver = NULL;
1052                         acpi_dev->driver_data = NULL;
1053                         return ret;
1054                 }
1055         }
1056
1057         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1058                           acpi_drv->name, acpi_dev->pnp.bus_id));
1059         get_device(dev);
1060         return 0;
1061 }
1062
1063 static int acpi_device_remove(struct device * dev)
1064 {
1065         struct acpi_device *acpi_dev = to_acpi_device(dev);
1066         struct acpi_driver *acpi_drv = acpi_dev->driver;
1067
1068         if (acpi_drv) {
1069                 if (acpi_drv->ops.notify)
1070                         acpi_device_remove_notify_handler(acpi_dev);
1071                 if (acpi_drv->ops.remove)
1072                         acpi_drv->ops.remove(acpi_dev);
1073         }
1074         acpi_dev->driver = NULL;
1075         acpi_dev->driver_data = NULL;
1076
1077         put_device(dev);
1078         return 0;
1079 }
1080
1081 struct bus_type acpi_bus_type = {
1082         .name           = "acpi",
1083         .match          = acpi_bus_match,
1084         .probe          = acpi_device_probe,
1085         .remove         = acpi_device_remove,
1086         .uevent         = acpi_device_uevent,
1087 };
1088
1089 static void acpi_device_del(struct acpi_device *device)
1090 {
1091         mutex_lock(&acpi_device_lock);
1092         if (device->parent)
1093                 list_del(&device->node);
1094
1095         list_del(&device->wakeup_list);
1096         mutex_unlock(&acpi_device_lock);
1097
1098         acpi_power_add_remove_device(device, false);
1099         acpi_device_remove_files(device);
1100         if (device->remove)
1101                 device->remove(device);
1102
1103         device_del(&device->dev);
1104 }
1105
1106 static LIST_HEAD(acpi_device_del_list);
1107 static DEFINE_MUTEX(acpi_device_del_lock);
1108
1109 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1110 {
1111         for (;;) {
1112                 struct acpi_device *adev;
1113
1114                 mutex_lock(&acpi_device_del_lock);
1115
1116                 if (list_empty(&acpi_device_del_list)) {
1117                         mutex_unlock(&acpi_device_del_lock);
1118                         break;
1119                 }
1120                 adev = list_first_entry(&acpi_device_del_list,
1121                                         struct acpi_device, del_list);
1122                 list_del(&adev->del_list);
1123
1124                 mutex_unlock(&acpi_device_del_lock);
1125
1126                 acpi_device_del(adev);
1127                 /*
1128                  * Drop references to all power resources that might have been
1129                  * used by the device.
1130                  */
1131                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1132                 put_device(&adev->dev);
1133         }
1134 }
1135
1136 /**
1137  * acpi_scan_drop_device - Drop an ACPI device object.
1138  * @handle: Handle of an ACPI namespace node, not used.
1139  * @context: Address of the ACPI device object to drop.
1140  *
1141  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1142  * namespace node the device object pointed to by @context is attached to.
1143  *
1144  * The unregistration is carried out asynchronously to avoid running
1145  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1146  * ensure the correct ordering (the device objects must be unregistered in the
1147  * same order in which the corresponding namespace nodes are deleted).
1148  */
1149 static void acpi_scan_drop_device(acpi_handle handle, void *context)
1150 {
1151         static DECLARE_WORK(work, acpi_device_del_work_fn);
1152         struct acpi_device *adev = context;
1153
1154         mutex_lock(&acpi_device_del_lock);
1155
1156         /*
1157          * Use the ACPI hotplug workqueue which is ordered, so this work item
1158          * won't run after any hotplug work items submitted subsequently.  That
1159          * prevents attempts to register device objects identical to those being
1160          * deleted from happening concurrently (such attempts result from
1161          * hotplug events handled via the ACPI hotplug workqueue).  It also will
1162          * run after all of the work items submitted previosuly, which helps
1163          * those work items to ensure that they are not accessing stale device
1164          * objects.
1165          */
1166         if (list_empty(&acpi_device_del_list))
1167                 acpi_queue_hotplug_work(&work);
1168
1169         list_add_tail(&adev->del_list, &acpi_device_del_list);
1170         /* Make acpi_ns_validate_handle() return NULL for this handle. */
1171         adev->handle = INVALID_ACPI_HANDLE;
1172
1173         mutex_unlock(&acpi_device_del_lock);
1174 }
1175
1176 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
1177                                 void (*callback)(void *))
1178 {
1179         acpi_status status;
1180
1181         if (!device)
1182                 return -EINVAL;
1183
1184         status = acpi_get_data_full(handle, acpi_scan_drop_device,
1185                                     (void **)device, callback);
1186         if (ACPI_FAILURE(status) || !*device) {
1187                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1188                                   handle));
1189                 return -ENODEV;
1190         }
1191         return 0;
1192 }
1193
1194 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1195 {
1196         return acpi_get_device_data(handle, device, NULL);
1197 }
1198 EXPORT_SYMBOL(acpi_bus_get_device);
1199
1200 static void get_acpi_device(void *dev)
1201 {
1202         if (dev)
1203                 get_device(&((struct acpi_device *)dev)->dev);
1204 }
1205
1206 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
1207 {
1208         struct acpi_device *adev = NULL;
1209
1210         acpi_get_device_data(handle, &adev, get_acpi_device);
1211         return adev;
1212 }
1213
1214 void acpi_bus_put_acpi_device(struct acpi_device *adev)
1215 {
1216         put_device(&adev->dev);
1217 }
1218
1219 int acpi_device_add(struct acpi_device *device,
1220                     void (*release)(struct device *))
1221 {
1222         int result;
1223         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1224         int found = 0;
1225
1226         if (device->handle) {
1227                 acpi_status status;
1228
1229                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1230                                           device);
1231                 if (ACPI_FAILURE(status)) {
1232                         acpi_handle_err(device->handle,
1233                                         "Unable to attach device data\n");
1234                         return -ENODEV;
1235                 }
1236         }
1237
1238         /*
1239          * Linkage
1240          * -------
1241          * Link this device to its parent and siblings.
1242          */
1243         INIT_LIST_HEAD(&device->children);
1244         INIT_LIST_HEAD(&device->node);
1245         INIT_LIST_HEAD(&device->wakeup_list);
1246         INIT_LIST_HEAD(&device->physical_node_list);
1247         INIT_LIST_HEAD(&device->del_list);
1248         mutex_init(&device->physical_node_lock);
1249
1250         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1251         if (!new_bus_id) {
1252                 pr_err(PREFIX "Memory allocation error\n");
1253                 result = -ENOMEM;
1254                 goto err_detach;
1255         }
1256
1257         mutex_lock(&acpi_device_lock);
1258         /*
1259          * Find suitable bus_id and instance number in acpi_bus_id_list
1260          * If failed, create one and link it into acpi_bus_id_list
1261          */
1262         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1263                 if (!strcmp(acpi_device_bus_id->bus_id,
1264                             acpi_device_hid(device))) {
1265                         acpi_device_bus_id->instance_no++;
1266                         found = 1;
1267                         kfree(new_bus_id);
1268                         break;
1269                 }
1270         }
1271         if (!found) {
1272                 acpi_device_bus_id = new_bus_id;
1273                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1274                 acpi_device_bus_id->instance_no = 0;
1275                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1276         }
1277         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1278
1279         if (device->parent)
1280                 list_add_tail(&device->node, &device->parent->children);
1281
1282         if (device->wakeup.flags.valid)
1283                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1284         mutex_unlock(&acpi_device_lock);
1285
1286         if (device->parent)
1287                 device->dev.parent = &device->parent->dev;
1288         device->dev.bus = &acpi_bus_type;
1289         device->dev.release = release;
1290         result = device_add(&device->dev);
1291         if (result) {
1292                 dev_err(&device->dev, "Error registering device\n");
1293                 goto err;
1294         }
1295
1296         result = acpi_device_setup_files(device);
1297         if (result)
1298                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1299                        dev_name(&device->dev));
1300
1301         return 0;
1302
1303  err:
1304         mutex_lock(&acpi_device_lock);
1305         if (device->parent)
1306                 list_del(&device->node);
1307         list_del(&device->wakeup_list);
1308         mutex_unlock(&acpi_device_lock);
1309
1310  err_detach:
1311         acpi_detach_data(device->handle, acpi_scan_drop_device);
1312         return result;
1313 }
1314
1315 /* --------------------------------------------------------------------------
1316                                  Driver Management
1317    -------------------------------------------------------------------------- */
1318 /**
1319  * acpi_bus_register_driver - register a driver with the ACPI bus
1320  * @driver: driver being registered
1321  *
1322  * Registers a driver with the ACPI bus.  Searches the namespace for all
1323  * devices that match the driver's criteria and binds.  Returns zero for
1324  * success or a negative error status for failure.
1325  */
1326 int acpi_bus_register_driver(struct acpi_driver *driver)
1327 {
1328         int ret;
1329
1330         if (acpi_disabled)
1331                 return -ENODEV;
1332         driver->drv.name = driver->name;
1333         driver->drv.bus = &acpi_bus_type;
1334         driver->drv.owner = driver->owner;
1335
1336         ret = driver_register(&driver->drv);
1337         return ret;
1338 }
1339
1340 EXPORT_SYMBOL(acpi_bus_register_driver);
1341
1342 /**
1343  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1344  * @driver: driver to unregister
1345  *
1346  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
1347  * devices that match the driver's criteria and unbinds.
1348  */
1349 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1350 {
1351         driver_unregister(&driver->drv);
1352 }
1353
1354 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1355
1356 /* --------------------------------------------------------------------------
1357                                  Device Enumeration
1358    -------------------------------------------------------------------------- */
1359 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1360 {
1361         struct acpi_device *device = NULL;
1362         acpi_status status;
1363
1364         /*
1365          * Fixed hardware devices do not appear in the namespace and do not
1366          * have handles, but we fabricate acpi_devices for them, so we have
1367          * to deal with them specially.
1368          */
1369         if (!handle)
1370                 return acpi_root;
1371
1372         do {
1373                 status = acpi_get_parent(handle, &handle);
1374                 if (ACPI_FAILURE(status))
1375                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
1376         } while (acpi_bus_get_device(handle, &device));
1377         return device;
1378 }
1379
1380 acpi_status
1381 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1382 {
1383         acpi_status status;
1384         acpi_handle tmp;
1385         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1386         union acpi_object *obj;
1387
1388         status = acpi_get_handle(handle, "_EJD", &tmp);
1389         if (ACPI_FAILURE(status))
1390                 return status;
1391
1392         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1393         if (ACPI_SUCCESS(status)) {
1394                 obj = buffer.pointer;
1395                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1396                                          ejd);
1397                 kfree(buffer.pointer);
1398         }
1399         return status;
1400 }
1401 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1402
1403 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1404                                         struct acpi_device_wakeup *wakeup)
1405 {
1406         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1407         union acpi_object *package = NULL;
1408         union acpi_object *element = NULL;
1409         acpi_status status;
1410         int err = -ENODATA;
1411
1412         if (!wakeup)
1413                 return -EINVAL;
1414
1415         INIT_LIST_HEAD(&wakeup->resources);
1416
1417         /* _PRW */
1418         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1419         if (ACPI_FAILURE(status)) {
1420                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1421                 return err;
1422         }
1423
1424         package = (union acpi_object *)buffer.pointer;
1425
1426         if (!package || package->package.count < 2)
1427                 goto out;
1428
1429         element = &(package->package.elements[0]);
1430         if (!element)
1431                 goto out;
1432
1433         if (element->type == ACPI_TYPE_PACKAGE) {
1434                 if ((element->package.count < 2) ||
1435                     (element->package.elements[0].type !=
1436                      ACPI_TYPE_LOCAL_REFERENCE)
1437                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1438                         goto out;
1439
1440                 wakeup->gpe_device =
1441                     element->package.elements[0].reference.handle;
1442                 wakeup->gpe_number =
1443                     (u32) element->package.elements[1].integer.value;
1444         } else if (element->type == ACPI_TYPE_INTEGER) {
1445                 wakeup->gpe_device = NULL;
1446                 wakeup->gpe_number = element->integer.value;
1447         } else {
1448                 goto out;
1449         }
1450
1451         element = &(package->package.elements[1]);
1452         if (element->type != ACPI_TYPE_INTEGER)
1453                 goto out;
1454
1455         wakeup->sleep_state = element->integer.value;
1456
1457         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1458         if (err)
1459                 goto out;
1460
1461         if (!list_empty(&wakeup->resources)) {
1462                 int sleep_state;
1463
1464                 err = acpi_power_wakeup_list_init(&wakeup->resources,
1465                                                   &sleep_state);
1466                 if (err) {
1467                         acpi_handle_warn(handle, "Retrieving current states "
1468                                          "of wakeup power resources failed\n");
1469                         acpi_power_resources_list_free(&wakeup->resources);
1470                         goto out;
1471                 }
1472                 if (sleep_state < wakeup->sleep_state) {
1473                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
1474                                          "(S%d) by S%d from power resources\n",
1475                                          (int)wakeup->sleep_state, sleep_state);
1476                         wakeup->sleep_state = sleep_state;
1477                 }
1478         }
1479
1480  out:
1481         kfree(buffer.pointer);
1482         return err;
1483 }
1484
1485 static void acpi_wakeup_gpe_init(struct acpi_device *device)
1486 {
1487         struct acpi_device_id button_device_ids[] = {
1488                 {"PNP0C0C", 0},
1489                 {"PNP0C0D", 0},
1490                 {"PNP0C0E", 0},
1491                 {"", 0},
1492         };
1493         struct acpi_device_wakeup *wakeup = &device->wakeup;
1494         acpi_status status;
1495         acpi_event_status event_status;
1496
1497         wakeup->flags.notifier_present = 0;
1498
1499         /* Power button, Lid switch always enable wakeup */
1500         if (!acpi_match_device_ids(device, button_device_ids)) {
1501                 wakeup->flags.run_wake = 1;
1502                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1503                         /* Do not use Lid/sleep button for S5 wakeup */
1504                         if (wakeup->sleep_state == ACPI_STATE_S5)
1505                                 wakeup->sleep_state = ACPI_STATE_S4;
1506                 }
1507                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
1508                 device_set_wakeup_capable(&device->dev, true);
1509                 return;
1510         }
1511
1512         acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
1513                                 wakeup->gpe_number);
1514         status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
1515                                      &event_status);
1516         if (ACPI_FAILURE(status))
1517                 return;
1518
1519         wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
1520 }
1521
1522 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1523 {
1524         int err;
1525
1526         /* Presence of _PRW indicates wake capable */
1527         if (!acpi_has_method(device->handle, "_PRW"))
1528                 return;
1529
1530         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1531                                                            &device->wakeup);
1532         if (err) {
1533                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1534                 return;
1535         }
1536
1537         device->wakeup.flags.valid = 1;
1538         device->wakeup.prepare_count = 0;
1539         acpi_wakeup_gpe_init(device);
1540         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1541          * system for the ACPI device with the _PRW object.
1542          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1543          * So it is necessary to call _DSW object first. Only when it is not
1544          * present will the _PSW object used.
1545          */
1546         err = acpi_device_sleep_wake(device, 0, 0, 0);
1547         if (err)
1548                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1549                                 "error in _DSW or _PSW evaluation\n"));
1550 }
1551
1552 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1553 {
1554         struct acpi_device_power_state *ps = &device->power.states[state];
1555         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1556         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1557         acpi_status status;
1558
1559         INIT_LIST_HEAD(&ps->resources);
1560
1561         /* Evaluate "_PRx" to get referenced power resources */
1562         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1563         if (ACPI_SUCCESS(status)) {
1564                 union acpi_object *package = buffer.pointer;
1565
1566                 if (buffer.length && package
1567                     && package->type == ACPI_TYPE_PACKAGE
1568                     && package->package.count) {
1569                         int err = acpi_extract_power_resources(package, 0,
1570                                                                &ps->resources);
1571                         if (!err)
1572                                 device->power.flags.power_resources = 1;
1573                 }
1574                 ACPI_FREE(buffer.pointer);
1575         }
1576
1577         /* Evaluate "_PSx" to see if we can do explicit sets */
1578         pathname[2] = 'S';
1579         if (acpi_has_method(device->handle, pathname))
1580                 ps->flags.explicit_set = 1;
1581
1582         /*
1583          * State is valid if there are means to put the device into it.
1584          * D3hot is only valid if _PR3 present.
1585          */
1586         if (!list_empty(&ps->resources)
1587             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1588                 ps->flags.valid = 1;
1589                 ps->flags.os_accessible = 1;
1590         }
1591
1592         ps->power = -1;         /* Unknown - driver assigned */
1593         ps->latency = -1;       /* Unknown - driver assigned */
1594 }
1595
1596 static void acpi_bus_get_power_flags(struct acpi_device *device)
1597 {
1598         u32 i;
1599
1600         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1601         if (!acpi_has_method(device->handle, "_PS0") &&
1602             !acpi_has_method(device->handle, "_PR0"))
1603                 return;
1604
1605         device->flags.power_manageable = 1;
1606
1607         /*
1608          * Power Management Flags
1609          */
1610         if (acpi_has_method(device->handle, "_PSC"))
1611                 device->power.flags.explicit_get = 1;
1612
1613         if (acpi_has_method(device->handle, "_IRC"))
1614                 device->power.flags.inrush_current = 1;
1615
1616         if (acpi_has_method(device->handle, "_DSW"))
1617                 device->power.flags.dsw_present = 1;
1618
1619         /*
1620          * Enumerate supported power management states
1621          */
1622         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1623                 acpi_bus_init_power_state(device, i);
1624
1625         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1626
1627         /* Set defaults for D0 and D3 states (always valid) */
1628         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1629         device->power.states[ACPI_STATE_D0].power = 100;
1630         device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1631         device->power.states[ACPI_STATE_D3_COLD].power = 0;
1632
1633         /* Set D3cold's explicit_set flag if _PS3 exists. */
1634         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1635                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1636
1637         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1638         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1639                         device->power.flags.power_resources)
1640                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1641
1642         if (acpi_bus_init_power(device)) {
1643                 acpi_free_power_resources_lists(device);
1644                 device->flags.power_manageable = 0;
1645         }
1646 }
1647
1648 static void acpi_bus_get_flags(struct acpi_device *device)
1649 {
1650         /* Presence of _STA indicates 'dynamic_status' */
1651         if (acpi_has_method(device->handle, "_STA"))
1652                 device->flags.dynamic_status = 1;
1653
1654         /* Presence of _RMV indicates 'removable' */
1655         if (acpi_has_method(device->handle, "_RMV"))
1656                 device->flags.removable = 1;
1657
1658         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1659         if (acpi_has_method(device->handle, "_EJD") ||
1660             acpi_has_method(device->handle, "_EJ0"))
1661                 device->flags.ejectable = 1;
1662 }
1663
1664 static void acpi_device_get_busid(struct acpi_device *device)
1665 {
1666         char bus_id[5] = { '?', 0 };
1667         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1668         int i = 0;
1669
1670         /*
1671          * Bus ID
1672          * ------
1673          * The device's Bus ID is simply the object name.
1674          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1675          */
1676         if (ACPI_IS_ROOT_DEVICE(device)) {
1677                 strcpy(device->pnp.bus_id, "ACPI");
1678                 return;
1679         }
1680
1681         switch (device->device_type) {
1682         case ACPI_BUS_TYPE_POWER_BUTTON:
1683                 strcpy(device->pnp.bus_id, "PWRF");
1684                 break;
1685         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1686                 strcpy(device->pnp.bus_id, "SLPF");
1687                 break;
1688         default:
1689                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1690                 /* Clean up trailing underscores (if any) */
1691                 for (i = 3; i > 1; i--) {
1692                         if (bus_id[i] == '_')
1693                                 bus_id[i] = '\0';
1694                         else
1695                                 break;
1696                 }
1697                 strcpy(device->pnp.bus_id, bus_id);
1698                 break;
1699         }
1700 }
1701
1702 /*
1703  * acpi_ata_match - see if an acpi object is an ATA device
1704  *
1705  * If an acpi object has one of the ACPI ATA methods defined,
1706  * then we can safely call it an ATA device.
1707  */
1708 bool acpi_ata_match(acpi_handle handle)
1709 {
1710         return acpi_has_method(handle, "_GTF") ||
1711                acpi_has_method(handle, "_GTM") ||
1712                acpi_has_method(handle, "_STM") ||
1713                acpi_has_method(handle, "_SDD");
1714 }
1715
1716 /*
1717  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1718  *
1719  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1720  * then we can safely call it an ejectable drive bay
1721  */
1722 bool acpi_bay_match(acpi_handle handle)
1723 {
1724         acpi_handle phandle;
1725
1726         if (!acpi_has_method(handle, "_EJ0"))
1727                 return false;
1728         if (acpi_ata_match(handle))
1729                 return true;
1730         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1731                 return false;
1732
1733         return acpi_ata_match(phandle);
1734 }
1735
1736 bool acpi_device_is_battery(struct acpi_device *adev)
1737 {
1738         struct acpi_hardware_id *hwid;
1739
1740         list_for_each_entry(hwid, &adev->pnp.ids, list)
1741                 if (!strcmp("PNP0C0A", hwid->id))
1742                         return true;
1743
1744         return false;
1745 }
1746
1747 static bool is_ejectable_bay(struct acpi_device *adev)
1748 {
1749         acpi_handle handle = adev->handle;
1750
1751         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1752                 return true;
1753
1754         return acpi_bay_match(handle);
1755 }
1756
1757 /*
1758  * acpi_dock_match - see if an acpi object has a _DCK method
1759  */
1760 bool acpi_dock_match(acpi_handle handle)
1761 {
1762         return acpi_has_method(handle, "_DCK");
1763 }
1764
1765 const char *acpi_device_hid(struct acpi_device *device)
1766 {
1767         struct acpi_hardware_id *hid;
1768
1769         if (list_empty(&device->pnp.ids))
1770                 return dummy_hid;
1771
1772         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1773         return hid->id;
1774 }
1775 EXPORT_SYMBOL(acpi_device_hid);
1776
1777 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1778 {
1779         struct acpi_hardware_id *id;
1780
1781         id = kmalloc(sizeof(*id), GFP_KERNEL);
1782         if (!id)
1783                 return;
1784
1785         id->id = kstrdup(dev_id, GFP_KERNEL);
1786         if (!id->id) {
1787                 kfree(id);
1788                 return;
1789         }
1790
1791         list_add_tail(&id->list, &pnp->ids);
1792         pnp->type.hardware_id = 1;
1793 }
1794
1795 /*
1796  * Old IBM workstations have a DSDT bug wherein the SMBus object
1797  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1798  * prefix.  Work around this.
1799  */
1800 static bool acpi_ibm_smbus_match(acpi_handle handle)
1801 {
1802         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1803         struct acpi_buffer path = { sizeof(node_name), node_name };
1804
1805         if (!dmi_name_in_vendors("IBM"))
1806                 return false;
1807
1808         /* Look for SMBS object */
1809         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1810             strcmp("SMBS", path.pointer))
1811                 return false;
1812
1813         /* Does it have the necessary (but misnamed) methods? */
1814         if (acpi_has_method(handle, "SBI") &&
1815             acpi_has_method(handle, "SBR") &&
1816             acpi_has_method(handle, "SBW"))
1817                 return true;
1818
1819         return false;
1820 }
1821
1822 static bool acpi_object_is_system_bus(acpi_handle handle)
1823 {
1824         acpi_handle tmp;
1825
1826         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1827             tmp == handle)
1828                 return true;
1829         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1830             tmp == handle)
1831                 return true;
1832
1833         return false;
1834 }
1835
1836 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1837                                 int device_type)
1838 {
1839         acpi_status status;
1840         struct acpi_device_info *info;
1841         struct acpi_pnp_device_id_list *cid_list;
1842         int i;
1843
1844         switch (device_type) {
1845         case ACPI_BUS_TYPE_DEVICE:
1846                 if (handle == ACPI_ROOT_OBJECT) {
1847                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1848                         break;
1849                 }
1850
1851                 status = acpi_get_object_info(handle, &info);
1852                 if (ACPI_FAILURE(status)) {
1853                         pr_err(PREFIX "%s: Error reading device info\n",
1854                                         __func__);
1855                         return;
1856                 }
1857
1858                 if (info->valid & ACPI_VALID_HID) {
1859                         acpi_add_id(pnp, info->hardware_id.string);
1860                         pnp->type.platform_id = 1;
1861                 }
1862                 if (info->valid & ACPI_VALID_CID) {
1863                         cid_list = &info->compatible_id_list;
1864                         for (i = 0; i < cid_list->count; i++)
1865                                 acpi_add_id(pnp, cid_list->ids[i].string);
1866                 }
1867                 if (info->valid & ACPI_VALID_ADR) {
1868                         pnp->bus_address = info->address;
1869                         pnp->type.bus_address = 1;
1870                 }
1871                 if (info->valid & ACPI_VALID_UID)
1872                         pnp->unique_id = kstrdup(info->unique_id.string,
1873                                                         GFP_KERNEL);
1874
1875                 kfree(info);
1876
1877                 /*
1878                  * Some devices don't reliably have _HIDs & _CIDs, so add
1879                  * synthetic HIDs to make sure drivers can find them.
1880                  */
1881                 if (acpi_is_video_device(handle))
1882                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1883                 else if (acpi_bay_match(handle))
1884                         acpi_add_id(pnp, ACPI_BAY_HID);
1885                 else if (acpi_dock_match(handle))
1886                         acpi_add_id(pnp, ACPI_DOCK_HID);
1887                 else if (acpi_ibm_smbus_match(handle))
1888                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1889                 else if (list_empty(&pnp->ids) &&
1890                          acpi_object_is_system_bus(handle)) {
1891                         /* \_SB, \_TZ, LNXSYBUS */
1892                         acpi_add_id(pnp, ACPI_BUS_HID);
1893                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1894                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1895                 }
1896
1897                 break;
1898         case ACPI_BUS_TYPE_POWER:
1899                 acpi_add_id(pnp, ACPI_POWER_HID);
1900                 break;
1901         case ACPI_BUS_TYPE_PROCESSOR:
1902                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1903                 break;
1904         case ACPI_BUS_TYPE_THERMAL:
1905                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1906                 break;
1907         case ACPI_BUS_TYPE_POWER_BUTTON:
1908                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1909                 break;
1910         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1911                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1912                 break;
1913         }
1914 }
1915
1916 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1917 {
1918         struct acpi_hardware_id *id, *tmp;
1919
1920         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1921                 kfree(id->id);
1922                 kfree(id);
1923         }
1924         kfree(pnp->unique_id);
1925 }
1926
1927 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1928                              int type, unsigned long long sta)
1929 {
1930         INIT_LIST_HEAD(&device->pnp.ids);
1931         device->device_type = type;
1932         device->handle = handle;
1933         device->parent = acpi_bus_get_parent(handle);
1934         acpi_set_device_status(device, sta);
1935         acpi_device_get_busid(device);
1936         acpi_set_pnp_ids(handle, &device->pnp, type);
1937         acpi_bus_get_flags(device);
1938         device->flags.match_driver = false;
1939         device->flags.initialized = true;
1940         device->flags.visited = false;
1941         device_initialize(&device->dev);
1942         dev_set_uevent_suppress(&device->dev, true);
1943 }
1944
1945 void acpi_device_add_finalize(struct acpi_device *device)
1946 {
1947         dev_set_uevent_suppress(&device->dev, false);
1948         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1949 }
1950
1951 static int acpi_add_single_object(struct acpi_device **child,
1952                                   acpi_handle handle, int type,
1953                                   unsigned long long sta)
1954 {
1955         int result;
1956         struct acpi_device *device;
1957         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1958
1959         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1960         if (!device) {
1961                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1962                 return -ENOMEM;
1963         }
1964
1965         acpi_init_device_object(device, handle, type, sta);
1966         acpi_bus_get_power_flags(device);
1967         acpi_bus_get_wakeup_device_flags(device);
1968
1969         result = acpi_device_add(device, acpi_device_release);
1970         if (result) {
1971                 acpi_device_release(&device->dev);
1972                 return result;
1973         }
1974
1975         acpi_power_add_remove_device(device, true);
1976         acpi_device_add_finalize(device);
1977         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1978         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1979                 dev_name(&device->dev), (char *) buffer.pointer,
1980                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1981         kfree(buffer.pointer);
1982         *child = device;
1983         return 0;
1984 }
1985
1986 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1987                                     unsigned long long *sta)
1988 {
1989         acpi_status status;
1990         acpi_object_type acpi_type;
1991
1992         status = acpi_get_type(handle, &acpi_type);
1993         if (ACPI_FAILURE(status))
1994                 return -ENODEV;
1995
1996         switch (acpi_type) {
1997         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1998         case ACPI_TYPE_DEVICE:
1999                 *type = ACPI_BUS_TYPE_DEVICE;
2000                 status = acpi_bus_get_status_handle(handle, sta);
2001                 if (ACPI_FAILURE(status))
2002                         return -ENODEV;
2003                 break;
2004         case ACPI_TYPE_PROCESSOR:
2005                 *type = ACPI_BUS_TYPE_PROCESSOR;
2006                 status = acpi_bus_get_status_handle(handle, sta);
2007                 if (ACPI_FAILURE(status))
2008                         return -ENODEV;
2009                 break;
2010         case ACPI_TYPE_THERMAL:
2011                 *type = ACPI_BUS_TYPE_THERMAL;
2012                 *sta = ACPI_STA_DEFAULT;
2013                 break;
2014         case ACPI_TYPE_POWER:
2015                 *type = ACPI_BUS_TYPE_POWER;
2016                 *sta = ACPI_STA_DEFAULT;
2017                 break;
2018         default:
2019                 return -ENODEV;
2020         }
2021
2022         return 0;
2023 }
2024
2025 bool acpi_device_is_present(struct acpi_device *adev)
2026 {
2027         if (adev->status.present || adev->status.functional)
2028                 return true;
2029
2030         adev->flags.initialized = false;
2031         return false;
2032 }
2033
2034 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
2035                                        char *idstr,
2036                                        const struct acpi_device_id **matchid)
2037 {
2038         const struct acpi_device_id *devid;
2039
2040         if (handler->match)
2041                 return handler->match(idstr, matchid);
2042
2043         for (devid = handler->ids; devid->id[0]; devid++)
2044                 if (!strcmp((char *)devid->id, idstr)) {
2045                         if (matchid)
2046                                 *matchid = devid;
2047
2048                         return true;
2049                 }
2050
2051         return false;
2052 }
2053
2054 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
2055                                         const struct acpi_device_id **matchid)
2056 {
2057         struct acpi_scan_handler *handler;
2058
2059         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
2060                 if (acpi_scan_handler_matching(handler, idstr, matchid))
2061                         return handler;
2062
2063         return NULL;
2064 }
2065
2066 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2067 {
2068         if (!!hotplug->enabled == !!val)
2069                 return;
2070
2071         mutex_lock(&acpi_scan_lock);
2072
2073         hotplug->enabled = val;
2074
2075         mutex_unlock(&acpi_scan_lock);
2076 }
2077
2078 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2079 {
2080         struct acpi_hardware_id *hwid;
2081
2082         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2083                 acpi_dock_add(adev);
2084                 return;
2085         }
2086         list_for_each_entry(hwid, &adev->pnp.ids, list) {
2087                 struct acpi_scan_handler *handler;
2088
2089                 handler = acpi_scan_match_handler(hwid->id, NULL);
2090                 if (handler) {
2091                         adev->flags.hotplug_notify = true;
2092                         break;
2093                 }
2094         }
2095 }
2096
2097 static void acpi_device_dep_initialize(struct acpi_device *adev)
2098 {
2099         struct acpi_dep_data *dep;
2100         struct acpi_handle_list dep_devices;
2101         acpi_status status;
2102         int i;
2103
2104         if (!acpi_has_method(adev->handle, "_DEP"))
2105                 return;
2106
2107         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
2108                                         &dep_devices);
2109         if (ACPI_FAILURE(status)) {
2110                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
2111                 return;
2112         }
2113
2114         for (i = 0; i < dep_devices.count; i++) {
2115                 struct acpi_device_info *info;
2116                 int skip;
2117
2118                 status = acpi_get_object_info(dep_devices.handles[i], &info);
2119                 if (ACPI_FAILURE(status)) {
2120                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
2121                         continue;
2122                 }
2123
2124                 /*
2125                  * Skip the dependency of Windows System Power
2126                  * Management Controller
2127                  */
2128                 skip = info->valid & ACPI_VALID_HID &&
2129                         !strcmp(info->hardware_id.string, "INT3396");
2130
2131                 kfree(info);
2132
2133                 if (skip)
2134                         continue;
2135
2136                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
2137                 if (!dep)
2138                         return;
2139
2140                 dep->master = dep_devices.handles[i];
2141                 dep->slave  = adev->handle;
2142                 adev->dep_unmet++;
2143
2144                 mutex_lock(&acpi_dep_list_lock);
2145                 list_add_tail(&dep->node , &acpi_dep_list);
2146                 mutex_unlock(&acpi_dep_list_lock);
2147         }
2148 }
2149
2150 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2151                                       void *not_used, void **return_value)
2152 {
2153         struct acpi_device *device = NULL;
2154         int type;
2155         unsigned long long sta;
2156         int result;
2157
2158         acpi_bus_get_device(handle, &device);
2159         if (device)
2160                 goto out;
2161
2162         result = acpi_bus_type_and_status(handle, &type, &sta);
2163         if (result)
2164                 return AE_OK;
2165
2166         if (type == ACPI_BUS_TYPE_POWER) {
2167                 acpi_add_power_resource(handle);
2168                 return AE_OK;
2169         }
2170
2171         acpi_add_single_object(&device, handle, type, sta);
2172         if (!device)
2173                 return AE_CTRL_DEPTH;
2174
2175         acpi_scan_init_hotplug(device);
2176         acpi_device_dep_initialize(device);
2177
2178  out:
2179         if (!*return_value)
2180                 *return_value = device;
2181
2182         return AE_OK;
2183 }
2184
2185 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
2186 {
2187         bool *is_spi_i2c_slave_p = data;
2188
2189         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
2190                 return 1;
2191
2192         /*
2193          * devices that are connected to UART still need to be enumerated to
2194          * platform bus
2195          */
2196         if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
2197                 *is_spi_i2c_slave_p = true;
2198
2199          /* no need to do more checking */
2200         return -1;
2201 }
2202
2203 static void acpi_default_enumeration(struct acpi_device *device)
2204 {
2205         struct list_head resource_list;
2206         bool is_spi_i2c_slave = false;
2207
2208         if (!device->pnp.type.platform_id || device->handler)
2209                 return;
2210
2211         /*
2212          * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2213          * respective parents.
2214          */
2215         INIT_LIST_HEAD(&resource_list);
2216         acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
2217                                &is_spi_i2c_slave);
2218         acpi_dev_free_resource_list(&resource_list);
2219         if (!is_spi_i2c_slave)
2220                 acpi_create_platform_device(device);
2221 }
2222
2223 static int acpi_scan_attach_handler(struct acpi_device *device)
2224 {
2225         struct acpi_hardware_id *hwid;
2226         int ret = 0;
2227
2228         list_for_each_entry(hwid, &device->pnp.ids, list) {
2229                 const struct acpi_device_id *devid;
2230                 struct acpi_scan_handler *handler;
2231
2232                 handler = acpi_scan_match_handler(hwid->id, &devid);
2233                 if (handler) {
2234                         if (!handler->attach) {
2235                                 device->pnp.type.platform_id = 0;
2236                                 continue;
2237                         }
2238                         device->handler = handler;
2239                         ret = handler->attach(device, devid);
2240                         if (ret > 0)
2241                                 break;
2242
2243                         device->handler = NULL;
2244                         if (ret < 0)
2245                                 break;
2246                 }
2247         }
2248         if (!ret)
2249                 acpi_default_enumeration(device);
2250
2251         return ret;
2252 }
2253
2254 static void acpi_bus_attach(struct acpi_device *device)
2255 {
2256         struct acpi_device *child;
2257         acpi_handle ejd;
2258         int ret;
2259
2260         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2261                 register_dock_dependent_device(device, ejd);
2262
2263         acpi_bus_get_status(device);
2264         /* Skip devices that are not present. */
2265         if (!acpi_device_is_present(device)) {
2266                 device->flags.visited = false;
2267                 return;
2268         }
2269         if (device->handler)
2270                 goto ok;
2271
2272         if (!device->flags.initialized) {
2273                 acpi_bus_update_power(device, NULL);
2274                 device->flags.initialized = true;
2275         }
2276         device->flags.visited = false;
2277         ret = acpi_scan_attach_handler(device);
2278         if (ret < 0)
2279                 return;
2280
2281         device->flags.match_driver = true;
2282         if (!ret) {
2283                 ret = device_attach(&device->dev);
2284                 if (ret < 0)
2285                         return;
2286         }
2287         device->flags.visited = true;
2288
2289  ok:
2290         list_for_each_entry(child, &device->children, node)
2291                 acpi_bus_attach(child);
2292
2293         if (device->handler && device->handler->hotplug.notify_online)
2294                 device->handler->hotplug.notify_online(device);
2295 }
2296
2297 void acpi_walk_dep_device_list(acpi_handle handle)
2298 {
2299         struct acpi_dep_data *dep, *tmp;
2300         struct acpi_device *adev;
2301
2302         mutex_lock(&acpi_dep_list_lock);
2303         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2304                 if (dep->master == handle) {
2305                         acpi_bus_get_device(dep->slave, &adev);
2306                         if (!adev)
2307                                 continue;
2308
2309                         adev->dep_unmet--;
2310                         if (!adev->dep_unmet)
2311                                 acpi_bus_attach(adev);
2312                         list_del(&dep->node);
2313                         kfree(dep);
2314                 }
2315         }
2316         mutex_unlock(&acpi_dep_list_lock);
2317 }
2318 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2319
2320 /**
2321  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2322  * @handle: Root of the namespace scope to scan.
2323  *
2324  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2325  * found devices.
2326  *
2327  * If no devices were found, -ENODEV is returned, but it does not mean that
2328  * there has been a real error.  There just have been no suitable ACPI objects
2329  * in the table trunk from which the kernel could create a device and add an
2330  * appropriate driver.
2331  *
2332  * Must be called under acpi_scan_lock.
2333  */
2334 int acpi_bus_scan(acpi_handle handle)
2335 {
2336         void *device = NULL;
2337
2338         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2339                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2340                                     acpi_bus_check_add, NULL, NULL, &device);
2341
2342         if (device) {
2343                 acpi_bus_attach(device);
2344                 return 0;
2345         }
2346         return -ENODEV;
2347 }
2348 EXPORT_SYMBOL(acpi_bus_scan);
2349
2350 /**
2351  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2352  * @adev: Root of the ACPI namespace scope to walk.
2353  *
2354  * Must be called under acpi_scan_lock.
2355  */
2356 void acpi_bus_trim(struct acpi_device *adev)
2357 {
2358         struct acpi_scan_handler *handler = adev->handler;
2359         struct acpi_device *child;
2360
2361         list_for_each_entry_reverse(child, &adev->children, node)
2362                 acpi_bus_trim(child);
2363
2364         adev->flags.match_driver = false;
2365         if (handler) {
2366                 if (handler->detach)
2367                         handler->detach(adev);
2368
2369                 adev->handler = NULL;
2370         } else {
2371                 device_release_driver(&adev->dev);
2372         }
2373         /*
2374          * Most likely, the device is going away, so put it into D3cold before
2375          * that.
2376          */
2377         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2378         adev->flags.initialized = false;
2379         adev->flags.visited = false;
2380 }
2381 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2382
2383 static int acpi_bus_scan_fixed(void)
2384 {
2385         int result = 0;
2386
2387         /*
2388          * Enumerate all fixed-feature devices.
2389          */
2390         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2391                 struct acpi_device *device = NULL;
2392
2393                 result = acpi_add_single_object(&device, NULL,
2394                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2395                                                 ACPI_STA_DEFAULT);
2396                 if (result)
2397                         return result;
2398
2399                 device->flags.match_driver = true;
2400                 result = device_attach(&device->dev);
2401                 if (result < 0)
2402                         return result;
2403
2404                 device_init_wakeup(&device->dev, true);
2405         }
2406
2407         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2408                 struct acpi_device *device = NULL;
2409
2410                 result = acpi_add_single_object(&device, NULL,
2411                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2412                                                 ACPI_STA_DEFAULT);
2413                 if (result)
2414                         return result;
2415
2416                 device->flags.match_driver = true;
2417                 result = device_attach(&device->dev);
2418         }
2419
2420         return result < 0 ? result : 0;
2421 }
2422
2423 int __init acpi_scan_init(void)
2424 {
2425         int result;
2426
2427         result = bus_register(&acpi_bus_type);
2428         if (result) {
2429                 /* We don't want to quit even if we failed to add suspend/resume */
2430                 printk(KERN_ERR PREFIX "Could not register bus type\n");
2431         }
2432
2433         acpi_pci_root_init();
2434         acpi_pci_link_init();
2435         acpi_processor_init();
2436         acpi_lpss_init();
2437         acpi_cmos_rtc_init();
2438         acpi_container_init();
2439         acpi_memory_hotplug_init();
2440         acpi_pnp_init();
2441         acpi_int340x_thermal_init();
2442
2443         mutex_lock(&acpi_scan_lock);
2444         /*
2445          * Enumerate devices in the ACPI namespace.
2446          */
2447         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2448         if (result)
2449                 goto out;
2450
2451         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2452         if (result)
2453                 goto out;
2454
2455         /* Fixed feature devices do not exist on HW-reduced platform */
2456         if (!acpi_gbl_reduced_hardware) {
2457                 result = acpi_bus_scan_fixed();
2458                 if (result) {
2459                         acpi_detach_data(acpi_root->handle,
2460                                          acpi_scan_drop_device);
2461                         acpi_device_del(acpi_root);
2462                         put_device(&acpi_root->dev);
2463                         goto out;
2464                 }
2465         }
2466
2467         acpi_update_all_gpes();
2468
2469  out:
2470         mutex_unlock(&acpi_scan_lock);
2471         return result;
2472 }