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/acpi_iort.h>
  11 #include <linux/signal.h>
  12 #include <linux/kthread.h>
  13 #include <linux/dmi.h>
  14 #include <linux/nls.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/platform_data/x86/apple.h>
  17
  18 #include <asm/pgtable.h>
  19
  20 #include "internal.h"
  21
  22 #define _COMPONENT              ACPI_BUS_COMPONENT
  23 ACPI_MODULE_NAME("scan");
  24 extern struct acpi_device *acpi_root;
  25
  26 #define ACPI_BUS_CLASS                  "system_bus"
  27 #define ACPI_BUS_HID                    "LNXSYBUS"
  28 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  29
  30 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  31
  32 #define INVALID_ACPI_HANDLE     ((acpi_handle)empty_zero_page)
  33
  34 static const char *dummy_hid = "device";
  35
  36 static LIST_HEAD(acpi_dep_list);
  37 static DEFINE_MUTEX(acpi_dep_list_lock);
  38 LIST_HEAD(acpi_bus_id_list);
  39 static DEFINE_MUTEX(acpi_scan_lock);
  40 static LIST_HEAD(acpi_scan_handlers_list);
  41 DEFINE_MUTEX(acpi_device_lock);
  42 LIST_HEAD(acpi_wakeup_device_list);
  43 static DEFINE_MUTEX(acpi_hp_context_lock);
  44
  45 /*
  46  * The UART device described by the SPCR table is the only object which needs
  47  * special-casing. Everything else is covered by ACPI namespace paths in STAO
  48  * table.
  49  */
  50 static u64 spcr_uart_addr;
  51
  52 struct acpi_dep_data {
  53         struct list_head node;
  54         acpi_handle master;
  55         acpi_handle slave;
  56 };
  57
  58 void acpi_scan_lock_acquire(void)
  59 {
  60         mutex_lock(&acpi_scan_lock);
  61 }
  62 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  63
  64 void acpi_scan_lock_release(void)
  65 {
  66         mutex_unlock(&acpi_scan_lock);
  67 }
  68 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  69
  70 void acpi_lock_hp_context(void)
  71 {
  72         mutex_lock(&acpi_hp_context_lock);
  73 }
  74
  75 void acpi_unlock_hp_context(void)
  76 {
  77         mutex_unlock(&acpi_hp_context_lock);
  78 }
  79
  80 void acpi_initialize_hp_context(struct acpi_device *adev,
  81                                 struct acpi_hotplug_context *hp,
  82                                 int (*notify)(struct acpi_device *, u32),
  83                                 void (*uevent)(struct acpi_device *, u32))
  84 {
  85         acpi_lock_hp_context();
  86         hp->notify = notify;
  87         hp->uevent = uevent;
  88         acpi_set_hp_context(adev, hp);
  89         acpi_unlock_hp_context();
  90 }
  91 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
  92
  93 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  94 {
  95         if (!handler)
  96                 return -EINVAL;
  97
  98         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  99         return 0;
 100 }
 101
 102 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
 103                                        const char *hotplug_profile_name)
 104 {
 105         int error;
 106
 107         error = acpi_scan_add_handler(handler);
 108         if (error)
 109                 return error;
 110
 111         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
 112         return 0;
 113 }
 114
 115 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 116 {
 117         struct acpi_device_physical_node *pn;
 118         bool offline = true;
 119
 120         /*
 121          * acpi_container_offline() calls this for all of the container's
 122          * children under the container's physical_node_lock lock.
 123          */
 124         mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
 125
 126         list_for_each_entry(pn, &adev->physical_node_list, node)
 127                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
 128                         if (uevent)
 129                                 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
 130
 131                         offline = false;
 132                         break;
 133                 }
 134
 135         mutex_unlock(&adev->physical_node_lock);
 136         return offline;
 137 }
 138
 139 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 140                                     void **ret_p)
 141 {
 142         struct acpi_device *device = NULL;
 143         struct acpi_device_physical_node *pn;
 144         bool second_pass = (bool)data;
 145         acpi_status status = AE_OK;
 146
 147         if (acpi_bus_get_device(handle, &device))
 148                 return AE_OK;
 149
 150         if (device->handler && !device->handler->hotplug.enabled) {
 151                 *ret_p = &device->dev;
 152                 return AE_SUPPORT;
 153         }
 154
 155         mutex_lock(&device->physical_node_lock);
 156
 157         list_for_each_entry(pn, &device->physical_node_list, node) {
 158                 int ret;
 159
 160                 if (second_pass) {
 161                         /* Skip devices offlined by the first pass. */
 162                         if (pn->put_online)
 163                                 continue;
 164                 } else {
 165                         pn->put_online = false;
 166                 }
 167                 ret = device_offline(pn->dev);
 168                 if (ret >= 0) {
 169                         pn->put_online = !ret;
 170                 } else {
 171                         *ret_p = pn->dev;
 172                         if (second_pass) {
 173                                 status = AE_ERROR;
 174                                 break;
 175                         }
 176                 }
 177         }
 178
 179         mutex_unlock(&device->physical_node_lock);
 180
 181         return status;
 182 }
 183
 184 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 185                                    void **ret_p)
 186 {
 187         struct acpi_device *device = NULL;
 188         struct acpi_device_physical_node *pn;
 189
 190         if (acpi_bus_get_device(handle, &device))
 191                 return AE_OK;
 192
 193         mutex_lock(&device->physical_node_lock);
 194
 195         list_for_each_entry(pn, &device->physical_node_list, node)
 196                 if (pn->put_online) {
 197                         device_online(pn->dev);
 198                         pn->put_online = false;
 199                 }
 200
 201         mutex_unlock(&device->physical_node_lock);
 202
 203         return AE_OK;
 204 }
 205
 206 static int acpi_scan_try_to_offline(struct acpi_device *device)
 207 {
 208         acpi_handle handle = device->handle;
 209         struct device *errdev = NULL;
 210         acpi_status status;
 211
 212         /*
 213          * Carry out two passes here and ignore errors in the first pass,
 214          * because if the devices in question are memory blocks and
 215          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 216          * that the other blocks depend on, but it is not known in advance which
 217          * block holds them.
 218          *
 219          * If the first pass is successful, the second one isn't needed, though.
 220          */
 221         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 222                                      NULL, acpi_bus_offline, (void *)false,
 223                                      (void **)&errdev);
 224         if (status == AE_SUPPORT) {
 225                 dev_warn(errdev, "Offline disabled.\n");
 226                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 227                                     acpi_bus_online, NULL, NULL, NULL);
 228                 return -EPERM;
 229         }
 230         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
 231         if (errdev) {
 232                 errdev = NULL;
 233                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 234                                     NULL, acpi_bus_offline, (void *)true,
 235                                     (void **)&errdev);
 236                 if (!errdev)
 237                         acpi_bus_offline(handle, 0, (void *)true,
 238                                          (void **)&errdev);
 239
 240                 if (errdev) {
 241                         dev_warn(errdev, "Offline failed.\n");
 242                         acpi_bus_online(handle, 0, NULL, NULL);
 243                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 244                                             ACPI_UINT32_MAX, acpi_bus_online,
 245                                             NULL, NULL, NULL);
 246                         return -EBUSY;
 247                 }
 248         }
 249         return 0;
 250 }
 251
 252 static int acpi_scan_hot_remove(struct acpi_device *device)
 253 {
 254         acpi_handle handle = device->handle;
 255         unsigned long long sta;
 256         acpi_status status;
 257
 258         if (device->handler && device->handler->hotplug.demand_offline) {
 259                 if (!acpi_scan_is_offline(device, true))
 260                         return -EBUSY;
 261         } else {
 262                 int error = acpi_scan_try_to_offline(device);
 263                 if (error)
 264                         return error;
 265         }
 266
 267         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 268                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 269
 270         acpi_bus_trim(device);
 271
 272         acpi_evaluate_lck(handle, 0);
 273         /*
 274          * TBD: _EJD support.
 275          */
 276         status = acpi_evaluate_ej0(handle);
 277         if (status == AE_NOT_FOUND)
 278                 return -ENODEV;
 279         else if (ACPI_FAILURE(status))
 280                 return -EIO;
 281
 282         /*
 283          * Verify if eject was indeed successful.  If not, log an error
 284          * message.  No need to call _OST since _EJ0 call was made OK.
 285          */
 286         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 287         if (ACPI_FAILURE(status)) {
 288                 acpi_handle_warn(handle,
 289                         "Status check after eject failed (0x%x)\n", status);
 290         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 291                 acpi_handle_warn(handle,
 292                         "Eject incomplete - status 0x%llx\n", sta);
 293         }
 294
 295         return 0;
 296 }
 297
 298 static int acpi_scan_device_not_present(struct acpi_device *adev)
 299 {
 300         if (!acpi_device_enumerated(adev)) {
 301                 dev_warn(&adev->dev, "Still not present\n");
 302                 return -EALREADY;
 303         }
 304         acpi_bus_trim(adev);
 305         return 0;
 306 }
 307
 308 static int acpi_scan_device_check(struct acpi_device *adev)
 309 {
 310         int error;
 311
 312         acpi_bus_get_status(adev);
 313         if (adev->status.present || adev->status.functional) {
 314                 /*
 315                  * This function is only called for device objects for which
 316                  * matching scan handlers exist.  The only situation in which
 317                  * the scan handler is not attached to this device object yet
 318                  * is when the device has just appeared (either it wasn't
 319                  * present at all before or it was removed and then added
 320                  * again).
 321                  */
 322                 if (adev->handler) {
 323                         dev_warn(&adev->dev, "Already enumerated\n");
 324                         return -EALREADY;
 325                 }
 326                 error = acpi_bus_scan(adev->handle);
 327                 if (error) {
 328                         dev_warn(&adev->dev, "Namespace scan failure\n");
 329                         return error;
 330                 }
 331                 if (!adev->handler) {
 332                         dev_warn(&adev->dev, "Enumeration failure\n");
 333                         error = -ENODEV;
 334                 }
 335         } else {
 336                 error = acpi_scan_device_not_present(adev);
 337         }
 338         return error;
 339 }
 340
 341 static int acpi_scan_bus_check(struct acpi_device *adev)
 342 {
 343         struct acpi_scan_handler *handler = adev->handler;
 344         struct acpi_device *child;
 345         int error;
 346
 347         acpi_bus_get_status(adev);
 348         if (!(adev->status.present || adev->status.functional)) {
 349                 acpi_scan_device_not_present(adev);
 350                 return 0;
 351         }
 352         if (handler && handler->hotplug.scan_dependent)
 353                 return handler->hotplug.scan_dependent(adev);
 354
 355         error = acpi_bus_scan(adev->handle);
 356         if (error) {
 357                 dev_warn(&adev->dev, "Namespace scan failure\n");
 358                 return error;
 359         }
 360         list_for_each_entry(child, &adev->children, node) {
 361                 error = acpi_scan_bus_check(child);
 362                 if (error)
 363                         return error;
 364         }
 365         return 0;
 366 }
 367
 368 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 369 {
 370         switch (type) {
 371         case ACPI_NOTIFY_BUS_CHECK:
 372                 return acpi_scan_bus_check(adev);
 373         case ACPI_NOTIFY_DEVICE_CHECK:
 374                 return acpi_scan_device_check(adev);
 375         case ACPI_NOTIFY_EJECT_REQUEST:
 376         case ACPI_OST_EC_OSPM_EJECT:
 377                 if (adev->handler && !adev->handler->hotplug.enabled) {
 378                         dev_info(&adev->dev, "Eject disabled\n");
 379                         return -EPERM;
 380                 }
 381                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 382                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 383                 return acpi_scan_hot_remove(adev);
 384         }
 385         return -EINVAL;
 386 }
 387
 388 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 389 {
 390         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 391         int error = -ENODEV;
 392
 393         lock_device_hotplug();
 394         mutex_lock(&acpi_scan_lock);
 395
 396         /*
 397          * The device object's ACPI handle cannot become invalid as long as we
 398          * are holding acpi_scan_lock, but it might have become invalid before
 399          * that lock was acquired.
 400          */
 401         if (adev->handle == INVALID_ACPI_HANDLE)
 402                 goto err_out;
 403
 404         if (adev->flags.is_dock_station) {
 405                 error = dock_notify(adev, src);
 406         } else if (adev->flags.hotplug_notify) {
 407                 error = acpi_generic_hotplug_event(adev, src);
 408         } else {
 409                 int (*notify)(struct acpi_device *, u32);
 410
 411                 acpi_lock_hp_context();
 412                 notify = adev->hp ? adev->hp->notify : NULL;
 413                 acpi_unlock_hp_context();
 414                 /*
 415                  * There may be additional notify handlers for device objects
 416                  * without the .event() callback, so ignore them here.
 417                  */
 418                 if (notify)
 419                         error = notify(adev, src);
 420                 else
 421                         goto out;
 422         }
 423         switch (error) {
 424         case 0:
 425                 ost_code = ACPI_OST_SC_SUCCESS;
 426                 break;
 427         case -EPERM:
 428                 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 429                 break;
 430         case -EBUSY:
 431                 ost_code = ACPI_OST_SC_DEVICE_BUSY;
 432                 break;
 433         default:
 434                 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 435                 break;
 436         }
 437
 438  err_out:
 439         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 440
 441  out:
 442         acpi_bus_put_acpi_device(adev);
 443         mutex_unlock(&acpi_scan_lock);
 444         unlock_device_hotplug();
 445 }
 446
 447 static void acpi_free_power_resources_lists(struct acpi_device *device)
 448 {
 449         int i;
 450
 451         if (device->wakeup.flags.valid)
 452                 acpi_power_resources_list_free(&device->wakeup.resources);
 453
 454         if (!device->power.flags.power_resources)
 455                 return;
 456
 457         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 458                 struct acpi_device_power_state *ps = &device->power.states[i];
 459                 acpi_power_resources_list_free(&ps->resources);
 460         }
 461 }
 462
 463 static void acpi_device_release(struct device *dev)
 464 {
 465         struct acpi_device *acpi_dev = to_acpi_device(dev);
 466
 467         acpi_free_properties(acpi_dev);
 468         acpi_free_pnp_ids(&acpi_dev->pnp);
 469         acpi_free_power_resources_lists(acpi_dev);
 470         kfree(acpi_dev);
 471 }
 472
 473 static void acpi_device_del(struct acpi_device *device)
 474 {
 475         struct acpi_device_bus_id *acpi_device_bus_id;
 476
 477         mutex_lock(&acpi_device_lock);
 478         if (device->parent)
 479                 list_del(&device->node);
 480
 481         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
 482                 if (!strcmp(acpi_device_bus_id->bus_id,
 483                             acpi_device_hid(device))) {
 484                         if (acpi_device_bus_id->instance_no > 0)
 485                                 acpi_device_bus_id->instance_no--;
 486                         else {
 487                                 list_del(&acpi_device_bus_id->node);
 488                                 kfree(acpi_device_bus_id);
 489                         }
 490                         break;
 491                 }
 492
 493         list_del(&device->wakeup_list);
 494         mutex_unlock(&acpi_device_lock);
 495
 496         acpi_power_add_remove_device(device, false);
 497         acpi_device_remove_files(device);
 498         if (device->remove)
 499                 device->remove(device);
 500
 501         device_del(&device->dev);
 502 }
 503
 504 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
 505
 506 static LIST_HEAD(acpi_device_del_list);
 507 static DEFINE_MUTEX(acpi_device_del_lock);
 508
 509 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 510 {
 511         for (;;) {
 512                 struct acpi_device *adev;
 513
 514                 mutex_lock(&acpi_device_del_lock);
 515
 516                 if (list_empty(&acpi_device_del_list)) {
 517                         mutex_unlock(&acpi_device_del_lock);
 518                         break;
 519                 }
 520                 adev = list_first_entry(&acpi_device_del_list,
 521                                         struct acpi_device, del_list);
 522                 list_del(&adev->del_list);
 523
 524                 mutex_unlock(&acpi_device_del_lock);
 525
 526                 blocking_notifier_call_chain(&acpi_reconfig_chain,
 527                                              ACPI_RECONFIG_DEVICE_REMOVE, adev);
 528
 529                 acpi_device_del(adev);
 530                 /*
 531                  * Drop references to all power resources that might have been
 532                  * used by the device.
 533                  */
 534                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
 535                 put_device(&adev->dev);
 536         }
 537 }
 538
 539 /**
 540  * acpi_scan_drop_device - Drop an ACPI device object.
 541  * @handle: Handle of an ACPI namespace node, not used.
 542  * @context: Address of the ACPI device object to drop.
 543  *
 544  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
 545  * namespace node the device object pointed to by @context is attached to.
 546  *
 547  * The unregistration is carried out asynchronously to avoid running
 548  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
 549  * ensure the correct ordering (the device objects must be unregistered in the
 550  * same order in which the corresponding namespace nodes are deleted).
 551  */
 552 static void acpi_scan_drop_device(acpi_handle handle, void *context)
 553 {
 554         static DECLARE_WORK(work, acpi_device_del_work_fn);
 555         struct acpi_device *adev = context;
 556
 557         mutex_lock(&acpi_device_del_lock);
 558
 559         /*
 560          * Use the ACPI hotplug workqueue which is ordered, so this work item
 561          * won't run after any hotplug work items submitted subsequently.  That
 562          * prevents attempts to register device objects identical to those being
 563          * deleted from happening concurrently (such attempts result from
 564          * hotplug events handled via the ACPI hotplug workqueue).  It also will
 565          * run after all of the work items submitted previosuly, which helps
 566          * those work items to ensure that they are not accessing stale device
 567          * objects.
 568          */
 569         if (list_empty(&acpi_device_del_list))
 570                 acpi_queue_hotplug_work(&work);
 571
 572         list_add_tail(&adev->del_list, &acpi_device_del_list);
 573         /* Make acpi_ns_validate_handle() return NULL for this handle. */
 574         adev->handle = INVALID_ACPI_HANDLE;
 575
 576         mutex_unlock(&acpi_device_del_lock);
 577 }
 578
 579 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
 580                                 void (*callback)(void *))
 581 {
 582         acpi_status status;
 583
 584         if (!device)
 585                 return -EINVAL;
 586
 587         status = acpi_get_data_full(handle, acpi_scan_drop_device,
 588                                     (void **)device, callback);
 589         if (ACPI_FAILURE(status) || !*device) {
 590                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 591                                   handle));
 592                 return -ENODEV;
 593         }
 594         return 0;
 595 }
 596
 597 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 598 {
 599         return acpi_get_device_data(handle, device, NULL);
 600 }
 601 EXPORT_SYMBOL(acpi_bus_get_device);
 602
 603 static void get_acpi_device(void *dev)
 604 {
 605         if (dev)
 606                 get_device(&((struct acpi_device *)dev)->dev);
 607 }
 608
 609 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 610 {
 611         struct acpi_device *adev = NULL;
 612
 613         acpi_get_device_data(handle, &adev, get_acpi_device);
 614         return adev;
 615 }
 616
 617 void acpi_bus_put_acpi_device(struct acpi_device *adev)
 618 {
 619         put_device(&adev->dev);
 620 }
 621
 622 int acpi_device_add(struct acpi_device *device,
 623                     void (*release)(struct device *))
 624 {
 625         int result;
 626         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 627         int found = 0;
 628
 629         if (device->handle) {
 630                 acpi_status status;
 631
 632                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
 633                                           device);
 634                 if (ACPI_FAILURE(status)) {
 635                         acpi_handle_err(device->handle,
 636                                         "Unable to attach device data\n");
 637                         return -ENODEV;
 638                 }
 639         }
 640
 641         /*
 642          * Linkage
 643          * -------
 644          * Link this device to its parent and siblings.
 645          */
 646         INIT_LIST_HEAD(&device->children);
 647         INIT_LIST_HEAD(&device->node);
 648         INIT_LIST_HEAD(&device->wakeup_list);
 649         INIT_LIST_HEAD(&device->physical_node_list);
 650         INIT_LIST_HEAD(&device->del_list);
 651         mutex_init(&device->physical_node_lock);
 652
 653         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 654         if (!new_bus_id) {
 655                 pr_err(PREFIX "Memory allocation error\n");
 656                 result = -ENOMEM;
 657                 goto err_detach;
 658         }
 659
 660         mutex_lock(&acpi_device_lock);
 661         /*
 662          * Find suitable bus_id and instance number in acpi_bus_id_list
 663          * If failed, create one and link it into acpi_bus_id_list
 664          */
 665         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 666                 if (!strcmp(acpi_device_bus_id->bus_id,
 667                             acpi_device_hid(device))) {
 668                         acpi_device_bus_id->instance_no++;
 669                         found = 1;
 670                         kfree(new_bus_id);
 671                         break;
 672                 }
 673         }
 674         if (!found) {
 675                 acpi_device_bus_id = new_bus_id;
 676                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 677                 acpi_device_bus_id->instance_no = 0;
 678                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 679         }
 680         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 681
 682         if (device->parent)
 683                 list_add_tail(&device->node, &device->parent->children);
 684
 685         if (device->wakeup.flags.valid)
 686                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 687         mutex_unlock(&acpi_device_lock);
 688
 689         if (device->parent)
 690                 device->dev.parent = &device->parent->dev;
 691         device->dev.bus = &acpi_bus_type;
 692         device->dev.release = release;
 693         result = device_add(&device->dev);
 694         if (result) {
 695                 dev_err(&device->dev, "Error registering device\n");
 696                 goto err;
 697         }
 698
 699         result = acpi_device_setup_files(device);
 700         if (result)
 701                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 702                        dev_name(&device->dev));
 703
 704         return 0;
 705
 706  err:
 707         mutex_lock(&acpi_device_lock);
 708         if (device->parent)
 709                 list_del(&device->node);
 710         list_del(&device->wakeup_list);
 711         mutex_unlock(&acpi_device_lock);
 712
 713  err_detach:
 714         acpi_detach_data(device->handle, acpi_scan_drop_device);
 715         return result;
 716 }
 717
 718 /* --------------------------------------------------------------------------
 719                                  Device Enumeration
 720    -------------------------------------------------------------------------- */
 721 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 722 {
 723         struct acpi_device *device = NULL;
 724         acpi_status status;
 725
 726         /*
 727          * Fixed hardware devices do not appear in the namespace and do not
 728          * have handles, but we fabricate acpi_devices for them, so we have
 729          * to deal with them specially.
 730          */
 731         if (!handle)
 732                 return acpi_root;
 733
 734         do {
 735                 status = acpi_get_parent(handle, &handle);
 736                 if (ACPI_FAILURE(status))
 737                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 738         } while (acpi_bus_get_device(handle, &device));
 739         return device;
 740 }
 741
 742 acpi_status
 743 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 744 {
 745         acpi_status status;
 746         acpi_handle tmp;
 747         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 748         union acpi_object *obj;
 749
 750         status = acpi_get_handle(handle, "_EJD", &tmp);
 751         if (ACPI_FAILURE(status))
 752                 return status;
 753
 754         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 755         if (ACPI_SUCCESS(status)) {
 756                 obj = buffer.pointer;
 757                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 758                                          ejd);
 759                 kfree(buffer.pointer);
 760         }
 761         return status;
 762 }
 763 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 764
 765 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 766                                         struct acpi_device_wakeup *wakeup)
 767 {
 768         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 769         union acpi_object *package = NULL;
 770         union acpi_object *element = NULL;
 771         acpi_status status;
 772         int err = -ENODATA;
 773
 774         if (!wakeup)
 775                 return -EINVAL;
 776
 777         INIT_LIST_HEAD(&wakeup->resources);
 778
 779         /* _PRW */
 780         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 781         if (ACPI_FAILURE(status)) {
 782                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 783                 return err;
 784         }
 785
 786         package = (union acpi_object *)buffer.pointer;
 787
 788         if (!package || package->package.count < 2)
 789                 goto out;
 790
 791         element = &(package->package.elements[0]);
 792         if (!element)
 793                 goto out;
 794
 795         if (element->type == ACPI_TYPE_PACKAGE) {
 796                 if ((element->package.count < 2) ||
 797                     (element->package.elements[0].type !=
 798                      ACPI_TYPE_LOCAL_REFERENCE)
 799                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 800                         goto out;
 801
 802                 wakeup->gpe_device =
 803                     element->package.elements[0].reference.handle;
 804                 wakeup->gpe_number =
 805                     (u32) element->package.elements[1].integer.value;
 806         } else if (element->type == ACPI_TYPE_INTEGER) {
 807                 wakeup->gpe_device = NULL;
 808                 wakeup->gpe_number = element->integer.value;
 809         } else {
 810                 goto out;
 811         }
 812
 813         element = &(package->package.elements[1]);
 814         if (element->type != ACPI_TYPE_INTEGER)
 815                 goto out;
 816
 817         wakeup->sleep_state = element->integer.value;
 818
 819         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 820         if (err)
 821                 goto out;
 822
 823         if (!list_empty(&wakeup->resources)) {
 824                 int sleep_state;
 825
 826                 err = acpi_power_wakeup_list_init(&wakeup->resources,
 827                                                   &sleep_state);
 828                 if (err) {
 829                         acpi_handle_warn(handle, "Retrieving current states "
 830                                          "of wakeup power resources failed\n");
 831                         acpi_power_resources_list_free(&wakeup->resources);
 832                         goto out;
 833                 }
 834                 if (sleep_state < wakeup->sleep_state) {
 835                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
 836                                          "(S%d) by S%d from power resources\n",
 837                                          (int)wakeup->sleep_state, sleep_state);
 838                         wakeup->sleep_state = sleep_state;
 839                 }
 840         }
 841
 842  out:
 843         kfree(buffer.pointer);
 844         return err;
 845 }
 846
 847 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
 848 {
 849         static const struct acpi_device_id button_device_ids[] = {
 850                 {"PNP0C0C", 0},
 851                 {"PNP0C0D", 0},
 852                 {"PNP0C0E", 0},
 853                 {"", 0},
 854         };
 855         struct acpi_device_wakeup *wakeup = &device->wakeup;
 856         acpi_status status;
 857
 858         wakeup->flags.notifier_present = 0;
 859
 860         /* Power button, Lid switch always enable wakeup */
 861         if (!acpi_match_device_ids(device, button_device_ids)) {
 862                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 863                         /* Do not use Lid/sleep button for S5 wakeup */
 864                         if (wakeup->sleep_state == ACPI_STATE_S5)
 865                                 wakeup->sleep_state = ACPI_STATE_S4;
 866                 }
 867                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 868                 device_set_wakeup_capable(&device->dev, true);
 869                 return true;
 870         }
 871
 872         status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 873                                          wakeup->gpe_number);
 874         return ACPI_SUCCESS(status);
 875 }
 876
 877 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 878 {
 879         int err;
 880
 881         /* Presence of _PRW indicates wake capable */
 882         if (!acpi_has_method(device->handle, "_PRW"))
 883                 return;
 884
 885         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
 886                                                            &device->wakeup);
 887         if (err) {
 888                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
 889                 return;
 890         }
 891
 892         device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
 893         device->wakeup.prepare_count = 0;
 894         /*
 895          * Call _PSW/_DSW object to disable its ability to wake the sleeping
 896          * system for the ACPI device with the _PRW object.
 897          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 898          * So it is necessary to call _DSW object first. Only when it is not
 899          * present will the _PSW object used.
 900          */
 901         err = acpi_device_sleep_wake(device, 0, 0, 0);
 902         if (err)
 903                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 904                                 "error in _DSW or _PSW evaluation\n"));
 905 }
 906
 907 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 908 {
 909         struct acpi_device_power_state *ps = &device->power.states[state];
 910         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 911         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 912         acpi_status status;
 913
 914         INIT_LIST_HEAD(&ps->resources);
 915
 916         /* Evaluate "_PRx" to get referenced power resources */
 917         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 918         if (ACPI_SUCCESS(status)) {
 919                 union acpi_object *package = buffer.pointer;
 920
 921                 if (buffer.length && package
 922                     && package->type == ACPI_TYPE_PACKAGE
 923                     && package->package.count) {
 924                         int err = acpi_extract_power_resources(package, 0,
 925                                                                &ps->resources);
 926                         if (!err)
 927                                 device->power.flags.power_resources = 1;
 928                 }
 929                 ACPI_FREE(buffer.pointer);
 930         }
 931
 932         /* Evaluate "_PSx" to see if we can do explicit sets */
 933         pathname[2] = 'S';
 934         if (acpi_has_method(device->handle, pathname))
 935                 ps->flags.explicit_set = 1;
 936
 937         /* State is valid if there are means to put the device into it. */
 938         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
 939                 ps->flags.valid = 1;
 940
 941         ps->power = -1;         /* Unknown - driver assigned */
 942         ps->latency = -1;       /* Unknown - driver assigned */
 943 }
 944
 945 static void acpi_bus_get_power_flags(struct acpi_device *device)
 946 {
 947         u32 i;
 948
 949         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 950         if (!acpi_has_method(device->handle, "_PS0") &&
 951             !acpi_has_method(device->handle, "_PR0"))
 952                 return;
 953
 954         device->flags.power_manageable = 1;
 955
 956         /*
 957          * Power Management Flags
 958          */
 959         if (acpi_has_method(device->handle, "_PSC"))
 960                 device->power.flags.explicit_get = 1;
 961
 962         if (acpi_has_method(device->handle, "_IRC"))
 963                 device->power.flags.inrush_current = 1;
 964
 965         if (acpi_has_method(device->handle, "_DSW"))
 966                 device->power.flags.dsw_present = 1;
 967
 968         /*
 969          * Enumerate supported power management states
 970          */
 971         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
 972                 acpi_bus_init_power_state(device, i);
 973
 974         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
 975         if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
 976                 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
 977
 978         /* Set defaults for D0 and D3hot states (always valid) */
 979         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 980         device->power.states[ACPI_STATE_D0].power = 100;
 981         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
 982
 983         if (acpi_bus_init_power(device))
 984                 device->flags.power_manageable = 0;
 985 }
 986
 987 static void acpi_bus_get_flags(struct acpi_device *device)
 988 {
 989         /* Presence of _STA indicates 'dynamic_status' */
 990         if (acpi_has_method(device->handle, "_STA"))
 991                 device->flags.dynamic_status = 1;
 992
 993         /* Presence of _RMV indicates 'removable' */
 994         if (acpi_has_method(device->handle, "_RMV"))
 995                 device->flags.removable = 1;
 996
 997         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 998         if (acpi_has_method(device->handle, "_EJD") ||
 999             acpi_has_method(device->handle, "_EJ0"))
1000                 device->flags.ejectable = 1;
1001 }
1002
1003 static void acpi_device_get_busid(struct acpi_device *device)
1004 {
1005         char bus_id[5] = { '?', 0 };
1006         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1007         int i = 0;
1008
1009         /*
1010          * Bus ID
1011          * ------
1012          * The device's Bus ID is simply the object name.
1013          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1014          */
1015         if (ACPI_IS_ROOT_DEVICE(device)) {
1016                 strcpy(device->pnp.bus_id, "ACPI");
1017                 return;
1018         }
1019
1020         switch (device->device_type) {
1021         case ACPI_BUS_TYPE_POWER_BUTTON:
1022                 strcpy(device->pnp.bus_id, "PWRF");
1023                 break;
1024         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1025                 strcpy(device->pnp.bus_id, "SLPF");
1026                 break;
1027         default:
1028                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1029                 /* Clean up trailing underscores (if any) */
1030                 for (i = 3; i > 1; i--) {
1031                         if (bus_id[i] == '_')
1032                                 bus_id[i] = '\0';
1033                         else
1034                                 break;
1035                 }
1036                 strcpy(device->pnp.bus_id, bus_id);
1037                 break;
1038         }
1039 }
1040
1041 /*
1042  * acpi_ata_match - see if an acpi object is an ATA device
1043  *
1044  * If an acpi object has one of the ACPI ATA methods defined,
1045  * then we can safely call it an ATA device.
1046  */
1047 bool acpi_ata_match(acpi_handle handle)
1048 {
1049         return acpi_has_method(handle, "_GTF") ||
1050                acpi_has_method(handle, "_GTM") ||
1051                acpi_has_method(handle, "_STM") ||
1052                acpi_has_method(handle, "_SDD");
1053 }
1054
1055 /*
1056  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1057  *
1058  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1059  * then we can safely call it an ejectable drive bay
1060  */
1061 bool acpi_bay_match(acpi_handle handle)
1062 {
1063         acpi_handle phandle;
1064
1065         if (!acpi_has_method(handle, "_EJ0"))
1066                 return false;
1067         if (acpi_ata_match(handle))
1068                 return true;
1069         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1070                 return false;
1071
1072         return acpi_ata_match(phandle);
1073 }
1074
1075 bool acpi_device_is_battery(struct acpi_device *adev)
1076 {
1077         struct acpi_hardware_id *hwid;
1078
1079         list_for_each_entry(hwid, &adev->pnp.ids, list)
1080                 if (!strcmp("PNP0C0A", hwid->id))
1081                         return true;
1082
1083         return false;
1084 }
1085
1086 static bool is_ejectable_bay(struct acpi_device *adev)
1087 {
1088         acpi_handle handle = adev->handle;
1089
1090         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1091                 return true;
1092
1093         return acpi_bay_match(handle);
1094 }
1095
1096 /*
1097  * acpi_dock_match - see if an acpi object has a _DCK method
1098  */
1099 bool acpi_dock_match(acpi_handle handle)
1100 {
1101         return acpi_has_method(handle, "_DCK");
1102 }
1103
1104 static acpi_status
1105 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1106                           void **return_value)
1107 {
1108         long *cap = context;
1109
1110         if (acpi_has_method(handle, "_BCM") &&
1111             acpi_has_method(handle, "_BCL")) {
1112                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1113                                   "support\n"));
1114                 *cap |= ACPI_VIDEO_BACKLIGHT;
1115                 /* We have backlight support, no need to scan further */
1116                 return AE_CTRL_TERMINATE;
1117         }
1118         return 0;
1119 }
1120
1121 /* Returns true if the ACPI object is a video device which can be
1122  * handled by video.ko.
1123  * The device will get a Linux specific CID added in scan.c to
1124  * identify the device as an ACPI graphics device
1125  * Be aware that the graphics device may not be physically present
1126  * Use acpi_video_get_capabilities() to detect general ACPI video
1127  * capabilities of present cards
1128  */
1129 long acpi_is_video_device(acpi_handle handle)
1130 {
1131         long video_caps = 0;
1132
1133         /* Is this device able to support video switching ? */
1134         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1135                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1136
1137         /* Is this device able to retrieve a video ROM ? */
1138         if (acpi_has_method(handle, "_ROM"))
1139                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1140
1141         /* Is this device able to configure which video head to be POSTed ? */
1142         if (acpi_has_method(handle, "_VPO") &&
1143             acpi_has_method(handle, "_GPD") &&
1144             acpi_has_method(handle, "_SPD"))
1145                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1146
1147         /* Only check for backlight functionality if one of the above hit. */
1148         if (video_caps)
1149                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1150                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1151                                     &video_caps, NULL);
1152
1153         return video_caps;
1154 }
1155 EXPORT_SYMBOL(acpi_is_video_device);
1156
1157 const char *acpi_device_hid(struct acpi_device *device)
1158 {
1159         struct acpi_hardware_id *hid;
1160
1161         if (list_empty(&device->pnp.ids))
1162                 return dummy_hid;
1163
1164         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1165         return hid->id;
1166 }
1167 EXPORT_SYMBOL(acpi_device_hid);
1168
1169 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1170 {
1171         struct acpi_hardware_id *id;
1172
1173         id = kmalloc(sizeof(*id), GFP_KERNEL);
1174         if (!id)
1175                 return;
1176
1177         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1178         if (!id->id) {
1179                 kfree(id);
1180                 return;
1181         }
1182
1183         list_add_tail(&id->list, &pnp->ids);
1184         pnp->type.hardware_id = 1;
1185 }
1186
1187 /*
1188  * Old IBM workstations have a DSDT bug wherein the SMBus object
1189  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1190  * prefix.  Work around this.
1191  */
1192 static bool acpi_ibm_smbus_match(acpi_handle handle)
1193 {
1194         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1195         struct acpi_buffer path = { sizeof(node_name), node_name };
1196
1197         if (!dmi_name_in_vendors("IBM"))
1198                 return false;
1199
1200         /* Look for SMBS object */
1201         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1202             strcmp("SMBS", path.pointer))
1203                 return false;
1204
1205         /* Does it have the necessary (but misnamed) methods? */
1206         if (acpi_has_method(handle, "SBI") &&
1207             acpi_has_method(handle, "SBR") &&
1208             acpi_has_method(handle, "SBW"))
1209                 return true;
1210
1211         return false;
1212 }
1213
1214 static bool acpi_object_is_system_bus(acpi_handle handle)
1215 {
1216         acpi_handle tmp;
1217
1218         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1219             tmp == handle)
1220                 return true;
1221         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1222             tmp == handle)
1223                 return true;
1224
1225         return false;
1226 }
1227
1228 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1229                                 int device_type)
1230 {
1231         acpi_status status;
1232         struct acpi_device_info *info;
1233         struct acpi_pnp_device_id_list *cid_list;
1234         int i;
1235
1236         switch (device_type) {
1237         case ACPI_BUS_TYPE_DEVICE:
1238                 if (handle == ACPI_ROOT_OBJECT) {
1239                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1240                         break;
1241                 }
1242
1243                 status = acpi_get_object_info(handle, &info);
1244                 if (ACPI_FAILURE(status)) {
1245                         pr_err(PREFIX "%s: Error reading device info\n",
1246                                         __func__);
1247                         return;
1248                 }
1249
1250                 if (info->valid & ACPI_VALID_HID) {
1251                         acpi_add_id(pnp, info->hardware_id.string);
1252                         pnp->type.platform_id = 1;
1253                 }
1254                 if (info->valid & ACPI_VALID_CID) {
1255                         cid_list = &info->compatible_id_list;
1256                         for (i = 0; i < cid_list->count; i++)
1257                                 acpi_add_id(pnp, cid_list->ids[i].string);
1258                 }
1259                 if (info->valid & ACPI_VALID_ADR) {
1260                         pnp->bus_address = info->address;
1261                         pnp->type.bus_address = 1;
1262                 }
1263                 if (info->valid & ACPI_VALID_UID)
1264                         pnp->unique_id = kstrdup(info->unique_id.string,
1265                                                         GFP_KERNEL);
1266                 if (info->valid & ACPI_VALID_CLS)
1267                         acpi_add_id(pnp, info->class_code.string);
1268
1269                 kfree(info);
1270
1271                 /*
1272                  * Some devices don't reliably have _HIDs & _CIDs, so add
1273                  * synthetic HIDs to make sure drivers can find them.
1274                  */
1275                 if (acpi_is_video_device(handle))
1276                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1277                 else if (acpi_bay_match(handle))
1278                         acpi_add_id(pnp, ACPI_BAY_HID);
1279                 else if (acpi_dock_match(handle))
1280                         acpi_add_id(pnp, ACPI_DOCK_HID);
1281                 else if (acpi_ibm_smbus_match(handle))
1282                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1283                 else if (list_empty(&pnp->ids) &&
1284                          acpi_object_is_system_bus(handle)) {
1285                         /* \_SB, \_TZ, LNXSYBUS */
1286                         acpi_add_id(pnp, ACPI_BUS_HID);
1287                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1288                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1289                 }
1290
1291                 break;
1292         case ACPI_BUS_TYPE_POWER:
1293                 acpi_add_id(pnp, ACPI_POWER_HID);
1294                 break;
1295         case ACPI_BUS_TYPE_PROCESSOR:
1296                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1297                 break;
1298         case ACPI_BUS_TYPE_THERMAL:
1299                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1300                 break;
1301         case ACPI_BUS_TYPE_POWER_BUTTON:
1302                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1303                 break;
1304         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1305                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1306                 break;
1307         }
1308 }
1309
1310 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1311 {
1312         struct acpi_hardware_id *id, *tmp;
1313
1314         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1315                 kfree_const(id->id);
1316                 kfree(id);
1317         }
1318         kfree(pnp->unique_id);
1319 }
1320
1321 /**
1322  * acpi_dma_supported - Check DMA support for the specified device.
1323  * @adev: The pointer to acpi device
1324  *
1325  * Return false if DMA is not supported. Otherwise, return true
1326  */
1327 bool acpi_dma_supported(struct acpi_device *adev)
1328 {
1329         if (!adev)
1330                 return false;
1331
1332         if (adev->flags.cca_seen)
1333                 return true;
1334
1335         /*
1336         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1337         * DMA on "Intel platforms".  Presumably that includes all x86 and
1338         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1339         */
1340         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1341                 return true;
1342
1343         return false;
1344 }
1345
1346 /**
1347  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1348  * @adev: The pointer to acpi device
1349  *
1350  * Return enum dev_dma_attr.
1351  */
1352 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1353 {
1354         if (!acpi_dma_supported(adev))
1355                 return DEV_DMA_NOT_SUPPORTED;
1356
1357         if (adev->flags.coherent_dma)
1358                 return DEV_DMA_COHERENT;
1359         else
1360                 return DEV_DMA_NON_COHERENT;
1361 }
1362
1363 /**
1364  * acpi_dma_get_range() - Get device DMA parameters.
1365  *
1366  * @dev: device to configure
1367  * @dma_addr: pointer device DMA address result
1368  * @offset: pointer to the DMA offset result
1369  * @size: pointer to DMA range size result
1370  *
1371  * Evaluate DMA regions and return respectively DMA region start, offset
1372  * and size in dma_addr, offset and size on parsing success; it does not
1373  * update the passed in values on failure.
1374  *
1375  * Return 0 on success, < 0 on failure.
1376  */
1377 int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1378                        u64 *size)
1379 {
1380         struct acpi_device *adev;
1381         LIST_HEAD(list);
1382         struct resource_entry *rentry;
1383         int ret;
1384         struct device *dma_dev = dev;
1385         u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1386
1387         /*
1388          * Walk the device tree chasing an ACPI companion with a _DMA
1389          * object while we go. Stop if we find a device with an ACPI
1390          * companion containing a _DMA method.
1391          */
1392         do {
1393                 adev = ACPI_COMPANION(dma_dev);
1394                 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1395                         break;
1396
1397                 dma_dev = dma_dev->parent;
1398         } while (dma_dev);
1399
1400         if (!dma_dev)
1401                 return -ENODEV;
1402
1403         if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1404                 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1405                 return -EINVAL;
1406         }
1407
1408         ret = acpi_dev_get_dma_resources(adev, &list);
1409         if (ret > 0) {
1410                 list_for_each_entry(rentry, &list, node) {
1411                         if (dma_offset && rentry->offset != dma_offset) {
1412                                 ret = -EINVAL;
1413                                 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1414                                 goto out;
1415                         }
1416                         dma_offset = rentry->offset;
1417
1418                         /* Take lower and upper limits */
1419                         if (rentry->res->start < dma_start)
1420                                 dma_start = rentry->res->start;
1421                         if (rentry->res->end > dma_end)
1422                                 dma_end = rentry->res->end;
1423                 }
1424
1425                 if (dma_start >= dma_end) {
1426                         ret = -EINVAL;
1427                         dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1428                         goto out;
1429                 }
1430
1431                 *dma_addr = dma_start - dma_offset;
1432                 len = dma_end - dma_start;
1433                 *size = max(len, len + 1);
1434                 *offset = dma_offset;
1435         }
1436  out:
1437         acpi_dev_free_resource_list(&list);
1438
1439         return ret >= 0 ? 0 : ret;
1440 }
1441
1442 /**
1443  * acpi_dma_configure - Set-up DMA configuration for the device.
1444  * @dev: The pointer to the device
1445  * @attr: device dma attributes
1446  */
1447 int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
1448 {
1449         const struct iommu_ops *iommu;
1450         u64 dma_addr = 0, size = 0;
1451
1452         iort_dma_setup(dev, &dma_addr, &size);
1453
1454         iommu = iort_iommu_configure(dev);
1455         if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
1456                 return -EPROBE_DEFER;
1457
1458         arch_setup_dma_ops(dev, dma_addr, size,
1459                                 iommu, attr == DEV_DMA_COHERENT);
1460
1461         return 0;
1462 }
1463 EXPORT_SYMBOL_GPL(acpi_dma_configure);
1464
1465 /**
1466  * acpi_dma_deconfigure - Tear-down DMA configuration for the device.
1467  * @dev: The pointer to the device
1468  */
1469 void acpi_dma_deconfigure(struct device *dev)
1470 {
1471         arch_teardown_dma_ops(dev);
1472 }
1473 EXPORT_SYMBOL_GPL(acpi_dma_deconfigure);
1474
1475 static void acpi_init_coherency(struct acpi_device *adev)
1476 {
1477         unsigned long long cca = 0;
1478         acpi_status status;
1479         struct acpi_device *parent = adev->parent;
1480
1481         if (parent && parent->flags.cca_seen) {
1482                 /*
1483                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1484                  * already saw one.
1485                  */
1486                 adev->flags.cca_seen = 1;
1487                 cca = parent->flags.coherent_dma;
1488         } else {
1489                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1490                                                NULL, &cca);
1491                 if (ACPI_SUCCESS(status))
1492                         adev->flags.cca_seen = 1;
1493                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1494                         /*
1495                          * If architecture does not specify that _CCA is
1496                          * required for DMA-able devices (e.g. x86),
1497                          * we default to _CCA=1.
1498                          */
1499                         cca = 1;
1500                 else
1501                         acpi_handle_debug(adev->handle,
1502                                           "ACPI device is missing _CCA.\n");
1503         }
1504
1505         adev->flags.coherent_dma = cca;
1506 }
1507
1508 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1509 {
1510         bool *is_serial_bus_slave_p = data;
1511
1512         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1513                 return 1;
1514
1515         *is_serial_bus_slave_p = true;
1516
1517          /* no need to do more checking */
1518         return -1;
1519 }
1520
1521 static bool acpi_is_serial_bus_slave(struct acpi_device *device)
1522 {
1523         struct list_head resource_list;
1524         bool is_serial_bus_slave = false;
1525
1526         /* Macs use device properties in lieu of _CRS resources */
1527         if (x86_apple_machine &&
1528             (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1529              fwnode_property_present(&device->fwnode, "i2cAddress") ||
1530              fwnode_property_present(&device->fwnode, "baud")))
1531                 return true;
1532
1533         INIT_LIST_HEAD(&resource_list);
1534         acpi_dev_get_resources(device, &resource_list,
1535                                acpi_check_serial_bus_slave,
1536                                &is_serial_bus_slave);
1537         acpi_dev_free_resource_list(&resource_list);
1538
1539         return is_serial_bus_slave;
1540 }
1541
1542 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1543                              int type, unsigned long long sta)
1544 {
1545         INIT_LIST_HEAD(&device->pnp.ids);
1546         device->device_type = type;
1547         device->handle = handle;
1548         device->parent = acpi_bus_get_parent(handle);
1549         device->fwnode.ops = &acpi_device_fwnode_ops;
1550         acpi_set_device_status(device, sta);
1551         acpi_device_get_busid(device);
1552         acpi_set_pnp_ids(handle, &device->pnp, type);
1553         acpi_init_properties(device);
1554         acpi_bus_get_flags(device);
1555         device->flags.match_driver = false;
1556         device->flags.initialized = true;
1557         device->flags.serial_bus_slave = acpi_is_serial_bus_slave(device);
1558         acpi_device_clear_enumerated(device);
1559         device_initialize(&device->dev);
1560         dev_set_uevent_suppress(&device->dev, true);
1561         acpi_init_coherency(device);
1562 }
1563
1564 void acpi_device_add_finalize(struct acpi_device *device)
1565 {
1566         dev_set_uevent_suppress(&device->dev, false);
1567         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1568 }
1569
1570 static int acpi_add_single_object(struct acpi_device **child,
1571                                   acpi_handle handle, int type,
1572                                   unsigned long long sta)
1573 {
1574         int result;
1575         struct acpi_device *device;
1576         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1577
1578         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1579         if (!device) {
1580                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1581                 return -ENOMEM;
1582         }
1583
1584         acpi_init_device_object(device, handle, type, sta);
1585         acpi_bus_get_power_flags(device);
1586         acpi_bus_get_wakeup_device_flags(device);
1587
1588         result = acpi_device_add(device, acpi_device_release);
1589         if (result) {
1590                 acpi_device_release(&device->dev);
1591                 return result;
1592         }
1593
1594         acpi_power_add_remove_device(device, true);
1595         acpi_device_add_finalize(device);
1596         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1597         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1598                 dev_name(&device->dev), (char *) buffer.pointer,
1599                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1600         kfree(buffer.pointer);
1601         *child = device;
1602         return 0;
1603 }
1604
1605 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1606                                             void *context)
1607 {
1608         struct resource *res = context;
1609
1610         if (acpi_dev_resource_memory(ares, res))
1611                 return AE_CTRL_TERMINATE;
1612
1613         return AE_OK;
1614 }
1615
1616 static bool acpi_device_should_be_hidden(acpi_handle handle)
1617 {
1618         acpi_status status;
1619         struct resource res;
1620
1621         /* Check if it should ignore the UART device */
1622         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1623                 return false;
1624
1625         /*
1626          * The UART device described in SPCR table is assumed to have only one
1627          * memory resource present. So we only look for the first one here.
1628          */
1629         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1630                                      acpi_get_resource_memory, &res);
1631         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1632                 return false;
1633
1634         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1635                          &res.start);
1636
1637         return true;
1638 }
1639
1640 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1641                                     unsigned long long *sta)
1642 {
1643         acpi_status status;
1644         acpi_object_type acpi_type;
1645
1646         status = acpi_get_type(handle, &acpi_type);
1647         if (ACPI_FAILURE(status))
1648                 return -ENODEV;
1649
1650         switch (acpi_type) {
1651         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1652         case ACPI_TYPE_DEVICE:
1653                 if (acpi_device_should_be_hidden(handle))
1654                         return -ENODEV;
1655
1656                 *type = ACPI_BUS_TYPE_DEVICE;
1657                 status = acpi_bus_get_status_handle(handle, sta);
1658                 if (ACPI_FAILURE(status))
1659                         *sta = 0;
1660                 break;
1661         case ACPI_TYPE_PROCESSOR:
1662                 *type = ACPI_BUS_TYPE_PROCESSOR;
1663                 status = acpi_bus_get_status_handle(handle, sta);
1664                 if (ACPI_FAILURE(status))
1665                         return -ENODEV;
1666                 break;
1667         case ACPI_TYPE_THERMAL:
1668                 *type = ACPI_BUS_TYPE_THERMAL;
1669                 *sta = ACPI_STA_DEFAULT;
1670                 break;
1671         case ACPI_TYPE_POWER:
1672                 *type = ACPI_BUS_TYPE_POWER;
1673                 *sta = ACPI_STA_DEFAULT;
1674                 break;
1675         default:
1676                 return -ENODEV;
1677         }
1678
1679         return 0;
1680 }
1681
1682 bool acpi_device_is_present(const struct acpi_device *adev)
1683 {
1684         return adev->status.present || adev->status.functional;
1685 }
1686
1687 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1688                                        const char *idstr,
1689                                        const struct acpi_device_id **matchid)
1690 {
1691         const struct acpi_device_id *devid;
1692
1693         if (handler->match)
1694                 return handler->match(idstr, matchid);
1695
1696         for (devid = handler->ids; devid->id[0]; devid++)
1697                 if (!strcmp((char *)devid->id, idstr)) {
1698                         if (matchid)
1699                                 *matchid = devid;
1700
1701                         return true;
1702                 }
1703
1704         return false;
1705 }
1706
1707 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1708                                         const struct acpi_device_id **matchid)
1709 {
1710         struct acpi_scan_handler *handler;
1711
1712         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1713                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1714                         return handler;
1715
1716         return NULL;
1717 }
1718
1719 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1720 {
1721         if (!!hotplug->enabled == !!val)
1722                 return;
1723
1724         mutex_lock(&acpi_scan_lock);
1725
1726         hotplug->enabled = val;
1727
1728         mutex_unlock(&acpi_scan_lock);
1729 }
1730
1731 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1732 {
1733         struct acpi_hardware_id *hwid;
1734
1735         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1736                 acpi_dock_add(adev);
1737                 return;
1738         }
1739         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1740                 struct acpi_scan_handler *handler;
1741
1742                 handler = acpi_scan_match_handler(hwid->id, NULL);
1743                 if (handler) {
1744                         adev->flags.hotplug_notify = true;
1745                         break;
1746                 }
1747         }
1748 }
1749
1750 static void acpi_device_dep_initialize(struct acpi_device *adev)
1751 {
1752         struct acpi_dep_data *dep;
1753         struct acpi_handle_list dep_devices;
1754         acpi_status status;
1755         int i;
1756
1757         if (!acpi_has_method(adev->handle, "_DEP"))
1758                 return;
1759
1760         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1761                                         &dep_devices);
1762         if (ACPI_FAILURE(status)) {
1763                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1764                 return;
1765         }
1766
1767         for (i = 0; i < dep_devices.count; i++) {
1768                 struct acpi_device_info *info;
1769                 int skip;
1770
1771                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1772                 if (ACPI_FAILURE(status)) {
1773                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1774                         continue;
1775                 }
1776
1777                 /*
1778                  * Skip the dependency of Windows System Power
1779                  * Management Controller
1780                  */
1781                 skip = info->valid & ACPI_VALID_HID &&
1782                         !strcmp(info->hardware_id.string, "INT3396");
1783
1784                 kfree(info);
1785
1786                 if (skip)
1787                         continue;
1788
1789                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1790                 if (!dep)
1791                         return;
1792
1793                 dep->master = dep_devices.handles[i];
1794                 dep->slave  = adev->handle;
1795                 adev->dep_unmet++;
1796
1797                 mutex_lock(&acpi_dep_list_lock);
1798                 list_add_tail(&dep->node , &acpi_dep_list);
1799                 mutex_unlock(&acpi_dep_list_lock);
1800         }
1801 }
1802
1803 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1804                                       void *not_used, void **return_value)
1805 {
1806         struct acpi_device *device = NULL;
1807         int type;
1808         unsigned long long sta;
1809         int result;
1810
1811         acpi_bus_get_device(handle, &device);
1812         if (device)
1813                 goto out;
1814
1815         result = acpi_bus_type_and_status(handle, &type, &sta);
1816         if (result)
1817                 return AE_OK;
1818
1819         if (type == ACPI_BUS_TYPE_POWER) {
1820                 acpi_add_power_resource(handle);
1821                 return AE_OK;
1822         }
1823
1824         acpi_add_single_object(&device, handle, type, sta);
1825         if (!device)
1826                 return AE_CTRL_DEPTH;
1827
1828         acpi_scan_init_hotplug(device);
1829         acpi_device_dep_initialize(device);
1830
1831  out:
1832         if (!*return_value)
1833                 *return_value = device;
1834
1835         return AE_OK;
1836 }
1837
1838 static void acpi_default_enumeration(struct acpi_device *device)
1839 {
1840         /*
1841          * Do not enumerate SPI/I2C/UART slaves as they will be enumerated by
1842          * their respective parents.
1843          */
1844         if (!device->flags.serial_bus_slave) {
1845                 acpi_create_platform_device(device, NULL);
1846                 acpi_device_set_enumerated(device);
1847         } else {
1848                 blocking_notifier_call_chain(&acpi_reconfig_chain,
1849                                              ACPI_RECONFIG_DEVICE_ADD, device);
1850         }
1851 }
1852
1853 static const struct acpi_device_id generic_device_ids[] = {
1854         {ACPI_DT_NAMESPACE_HID, },
1855         {"", },
1856 };
1857
1858 static int acpi_generic_device_attach(struct acpi_device *adev,
1859                                       const struct acpi_device_id *not_used)
1860 {
1861         /*
1862          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1863          * below can be unconditional.
1864          */
1865         if (adev->data.of_compatible)
1866                 acpi_default_enumeration(adev);
1867
1868         return 1;
1869 }
1870
1871 static struct acpi_scan_handler generic_device_handler = {
1872         .ids = generic_device_ids,
1873         .attach = acpi_generic_device_attach,
1874 };
1875
1876 static int acpi_scan_attach_handler(struct acpi_device *device)
1877 {
1878         struct acpi_hardware_id *hwid;
1879         int ret = 0;
1880
1881         list_for_each_entry(hwid, &device->pnp.ids, list) {
1882                 const struct acpi_device_id *devid;
1883                 struct acpi_scan_handler *handler;
1884
1885                 handler = acpi_scan_match_handler(hwid->id, &devid);
1886                 if (handler) {
1887                         if (!handler->attach) {
1888                                 device->pnp.type.platform_id = 0;
1889                                 continue;
1890                         }
1891                         device->handler = handler;
1892                         ret = handler->attach(device, devid);
1893                         if (ret > 0)
1894                                 break;
1895
1896                         device->handler = NULL;
1897                         if (ret < 0)
1898                                 break;
1899                 }
1900         }
1901
1902         return ret;
1903 }
1904
1905 static void acpi_bus_attach(struct acpi_device *device)
1906 {
1907         struct acpi_device *child;
1908         acpi_handle ejd;
1909         int ret;
1910
1911         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1912                 register_dock_dependent_device(device, ejd);
1913
1914         acpi_bus_get_status(device);
1915         /* Skip devices that are not present. */
1916         if (!acpi_device_is_present(device)) {
1917                 device->flags.initialized = false;
1918                 acpi_device_clear_enumerated(device);
1919                 device->flags.power_manageable = 0;
1920                 return;
1921         }
1922         if (device->handler)
1923                 goto ok;
1924
1925         if (!device->flags.initialized) {
1926                 device->flags.power_manageable =
1927                         device->power.states[ACPI_STATE_D0].flags.valid;
1928                 if (acpi_bus_init_power(device))
1929                         device->flags.power_manageable = 0;
1930
1931                 device->flags.initialized = true;
1932         } else if (device->flags.visited) {
1933                 goto ok;
1934         }
1935
1936         ret = acpi_scan_attach_handler(device);
1937         if (ret < 0)
1938                 return;
1939
1940         device->flags.match_driver = true;
1941         if (ret > 0 && !device->flags.serial_bus_slave) {
1942                 acpi_device_set_enumerated(device);
1943                 goto ok;
1944         }
1945
1946         ret = device_attach(&device->dev);
1947         if (ret < 0)
1948                 return;
1949
1950         if (!device->pnp.type.platform_id && !device->flags.serial_bus_slave)
1951                 acpi_device_set_enumerated(device);
1952         else
1953                 acpi_default_enumeration(device);
1954
1955  ok:
1956         list_for_each_entry(child, &device->children, node)
1957                 acpi_bus_attach(child);
1958
1959         if (device->handler && device->handler->hotplug.notify_online)
1960                 device->handler->hotplug.notify_online(device);
1961 }
1962
1963 void acpi_walk_dep_device_list(acpi_handle handle)
1964 {
1965         struct acpi_dep_data *dep, *tmp;
1966         struct acpi_device *adev;
1967
1968         mutex_lock(&acpi_dep_list_lock);
1969         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
1970                 if (dep->master == handle) {
1971                         acpi_bus_get_device(dep->slave, &adev);
1972                         if (!adev)
1973                                 continue;
1974
1975                         adev->dep_unmet--;
1976                         if (!adev->dep_unmet)
1977                                 acpi_bus_attach(adev);
1978                         list_del(&dep->node);
1979                         kfree(dep);
1980                 }
1981         }
1982         mutex_unlock(&acpi_dep_list_lock);
1983 }
1984 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
1985
1986 /**
1987  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1988  * @handle: Root of the namespace scope to scan.
1989  *
1990  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1991  * found devices.
1992  *
1993  * If no devices were found, -ENODEV is returned, but it does not mean that
1994  * there has been a real error.  There just have been no suitable ACPI objects
1995  * in the table trunk from which the kernel could create a device and add an
1996  * appropriate driver.
1997  *
1998  * Must be called under acpi_scan_lock.
1999  */
2000 int acpi_bus_scan(acpi_handle handle)
2001 {
2002         void *device = NULL;
2003
2004         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2005                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2006                                     acpi_bus_check_add, NULL, NULL, &device);
2007
2008         if (device) {
2009                 acpi_bus_attach(device);
2010                 return 0;
2011         }
2012         return -ENODEV;
2013 }
2014 EXPORT_SYMBOL(acpi_bus_scan);
2015
2016 /**
2017  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2018  * @adev: Root of the ACPI namespace scope to walk.
2019  *
2020  * Must be called under acpi_scan_lock.
2021  */
2022 void acpi_bus_trim(struct acpi_device *adev)
2023 {
2024         struct acpi_scan_handler *handler = adev->handler;
2025         struct acpi_device *child;
2026
2027         list_for_each_entry_reverse(child, &adev->children, node)
2028                 acpi_bus_trim(child);
2029
2030         adev->flags.match_driver = false;
2031         if (handler) {
2032                 if (handler->detach)
2033                         handler->detach(adev);
2034
2035                 adev->handler = NULL;
2036         } else {
2037                 device_release_driver(&adev->dev);
2038         }
2039         /*
2040          * Most likely, the device is going away, so put it into D3cold before
2041          * that.
2042          */
2043         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2044         adev->flags.initialized = false;
2045         acpi_device_clear_enumerated(adev);
2046 }
2047 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2048
2049 static int acpi_bus_scan_fixed(void)
2050 {
2051         int result = 0;
2052
2053         /*
2054          * Enumerate all fixed-feature devices.
2055          */
2056         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2057                 struct acpi_device *device = NULL;
2058
2059                 result = acpi_add_single_object(&device, NULL,
2060                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2061                                                 ACPI_STA_DEFAULT);
2062                 if (result)
2063                         return result;
2064
2065                 device->flags.match_driver = true;
2066                 result = device_attach(&device->dev);
2067                 if (result < 0)
2068                         return result;
2069
2070                 device_init_wakeup(&device->dev, true);
2071         }
2072
2073         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2074                 struct acpi_device *device = NULL;
2075
2076                 result = acpi_add_single_object(&device, NULL,
2077                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2078                                                 ACPI_STA_DEFAULT);
2079                 if (result)
2080                         return result;
2081
2082                 device->flags.match_driver = true;
2083                 result = device_attach(&device->dev);
2084         }
2085
2086         return result < 0 ? result : 0;
2087 }
2088
2089 static void __init acpi_get_spcr_uart_addr(void)
2090 {
2091         acpi_status status;
2092         struct acpi_table_spcr *spcr_ptr;
2093
2094         status = acpi_get_table(ACPI_SIG_SPCR, 0,
2095                                 (struct acpi_table_header **)&spcr_ptr);
2096         if (ACPI_SUCCESS(status))
2097                 spcr_uart_addr = spcr_ptr->serial_port.address;
2098         else
2099                 printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
2100 }
2101
2102 static bool acpi_scan_initialized;
2103
2104 int __init acpi_scan_init(void)
2105 {
2106         int result;
2107         acpi_status status;
2108         struct acpi_table_stao *stao_ptr;
2109
2110         acpi_pci_root_init();
2111         acpi_pci_link_init();
2112         acpi_processor_init();
2113         acpi_lpss_init();
2114         acpi_apd_init();
2115         acpi_cmos_rtc_init();
2116         acpi_container_init();
2117         acpi_memory_hotplug_init();
2118         acpi_pnp_init();
2119         acpi_int340x_thermal_init();
2120         acpi_amba_init();
2121         acpi_watchdog_init();
2122         acpi_init_lpit();
2123
2124         acpi_scan_add_handler(&generic_device_handler);
2125
2126         /*
2127          * If there is STAO table, check whether it needs to ignore the UART
2128          * device in SPCR table.
2129          */
2130         status = acpi_get_table(ACPI_SIG_STAO, 0,
2131                                 (struct acpi_table_header **)&stao_ptr);
2132         if (ACPI_SUCCESS(status)) {
2133                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2134                         printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
2135
2136                 if (stao_ptr->ignore_uart)
2137                         acpi_get_spcr_uart_addr();
2138         }
2139
2140         acpi_gpe_apply_masked_gpes();
2141         acpi_update_all_gpes();
2142
2143         mutex_lock(&acpi_scan_lock);
2144         /*
2145          * Enumerate devices in the ACPI namespace.
2146          */
2147         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2148         if (result)
2149                 goto out;
2150
2151         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2152         if (result)
2153                 goto out;
2154
2155         /* Fixed feature devices do not exist on HW-reduced platform */
2156         if (!acpi_gbl_reduced_hardware) {
2157                 result = acpi_bus_scan_fixed();
2158                 if (result) {
2159                         acpi_detach_data(acpi_root->handle,
2160                                          acpi_scan_drop_device);
2161                         acpi_device_del(acpi_root);
2162                         put_device(&acpi_root->dev);
2163                         goto out;
2164                 }
2165         }
2166
2167         acpi_scan_initialized = true;
2168
2169  out:
2170         mutex_unlock(&acpi_scan_lock);
2171         return result;
2172 }
2173
2174 static struct acpi_probe_entry *ape;
2175 static int acpi_probe_count;
2176 static DEFINE_MUTEX(acpi_probe_mutex);
2177
2178 static int __init acpi_match_madt(struct acpi_subtable_header *header,
2179                                   const unsigned long end)
2180 {
2181         if (!ape->subtable_valid || ape->subtable_valid(header, ape))
2182                 if (!ape->probe_subtbl(header, end))
2183                         acpi_probe_count++;
2184
2185         return 0;
2186 }
2187
2188 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2189 {
2190         int count = 0;
2191
2192         if (acpi_disabled)
2193                 return 0;
2194
2195         mutex_lock(&acpi_probe_mutex);
2196         for (ape = ap_head; nr; ape++, nr--) {
2197                 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
2198                         acpi_probe_count = 0;
2199                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2200                         count += acpi_probe_count;
2201                 } else {
2202                         int res;
2203                         res = acpi_table_parse(ape->id, ape->probe_table);
2204                         if (!res)
2205                                 count++;
2206                 }
2207         }
2208         mutex_unlock(&acpi_probe_mutex);
2209
2210         return count;
2211 }
2212
2213 struct acpi_table_events_work {
2214         struct work_struct work;
2215         void *table;
2216         u32 event;
2217 };
2218
2219 static void acpi_table_events_fn(struct work_struct *work)
2220 {
2221         struct acpi_table_events_work *tew;
2222
2223         tew = container_of(work, struct acpi_table_events_work, work);
2224
2225         if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2226                 acpi_scan_lock_acquire();
2227                 acpi_bus_scan(ACPI_ROOT_OBJECT);
2228                 acpi_scan_lock_release();
2229         }
2230
2231         kfree(tew);
2232 }
2233
2234 void acpi_scan_table_handler(u32 event, void *table, void *context)
2235 {
2236         struct acpi_table_events_work *tew;
2237
2238         if (!acpi_scan_initialized)
2239                 return;
2240
2241         if (event != ACPI_TABLE_EVENT_LOAD)
2242                 return;
2243
2244         tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2245         if (!tew)
2246                 return;
2247
2248         INIT_WORK(&tew->work, acpi_table_events_fn);
2249         tew->table = table;
2250         tew->event = event;
2251
2252         schedule_work(&tew->work);
2253 }
2254
2255 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2256 {
2257         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2258 }
2259 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2260
2261 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2262 {
2263         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2264 }
2265 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);