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
  17 #include <asm/pgtable.h>
  18
  19 #include "internal.h"
  20
  21 #define _COMPONENT              ACPI_BUS_COMPONENT
  22 ACPI_MODULE_NAME("scan");
  23 extern struct acpi_device *acpi_root;
  24
  25 #define ACPI_BUS_CLASS                  "system_bus"
  26 #define ACPI_BUS_HID                    "LNXSYBUS"
  27 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  28
  29 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  30
  31 #define INVALID_ACPI_HANDLE     ((acpi_handle)empty_zero_page)
  32
  33 static const char *dummy_hid = "device";
  34
  35 static LIST_HEAD(acpi_dep_list);
  36 static DEFINE_MUTEX(acpi_dep_list_lock);
  37 LIST_HEAD(acpi_bus_id_list);
  38 static DEFINE_MUTEX(acpi_scan_lock);
  39 static LIST_HEAD(acpi_scan_handlers_list);
  40 DEFINE_MUTEX(acpi_device_lock);
  41 LIST_HEAD(acpi_wakeup_device_list);
  42 static DEFINE_MUTEX(acpi_hp_context_lock);
  43
  44 /*
  45  * The UART device described by the SPCR table is the only object which needs
  46  * special-casing. Everything else is covered by ACPI namespace paths in STAO
  47  * table.
  48  */
  49 static u64 spcr_uart_addr;
  50
  51 struct acpi_dep_data {
  52         struct list_head node;
  53         acpi_handle master;
  54         acpi_handle slave;
  55 };
  56
  57 void acpi_scan_lock_acquire(void)
  58 {
  59         mutex_lock(&acpi_scan_lock);
  60 }
  61 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  62
  63 void acpi_scan_lock_release(void)
  64 {
  65         mutex_unlock(&acpi_scan_lock);
  66 }
  67 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  68
  69 void acpi_lock_hp_context(void)
  70 {
  71         mutex_lock(&acpi_hp_context_lock);
  72 }
  73
  74 void acpi_unlock_hp_context(void)
  75 {
  76         mutex_unlock(&acpi_hp_context_lock);
  77 }
  78
  79 void acpi_initialize_hp_context(struct acpi_device *adev,
  80                                 struct acpi_hotplug_context *hp,
  81                                 int (*notify)(struct acpi_device *, u32),
  82                                 void (*uevent)(struct acpi_device *, u32))
  83 {
  84         acpi_lock_hp_context();
  85         hp->notify = notify;
  86         hp->uevent = uevent;
  87         acpi_set_hp_context(adev, hp);
  88         acpi_unlock_hp_context();
  89 }
  90 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
  91
  92 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  93 {
  94         if (!handler)
  95                 return -EINVAL;
  96
  97         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  98         return 0;
  99 }
 100
 101 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
 102                                        const char *hotplug_profile_name)
 103 {
 104         int error;
 105
 106         error = acpi_scan_add_handler(handler);
 107         if (error)
 108                 return error;
 109
 110         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
 111         return 0;
 112 }
 113
 114 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 115 {
 116         struct acpi_device_physical_node *pn;
 117         bool offline = true;
 118
 119         /*
 120          * acpi_container_offline() calls this for all of the container's
 121          * children under the container's physical_node_lock lock.
 122          */
 123         mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
 124
 125         list_for_each_entry(pn, &adev->physical_node_list, node)
 126                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
 127                         if (uevent)
 128                                 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
 129
 130                         offline = false;
 131                         break;
 132                 }
 133
 134         mutex_unlock(&adev->physical_node_lock);
 135         return offline;
 136 }
 137
 138 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 139                                     void **ret_p)
 140 {
 141         struct acpi_device *device = NULL;
 142         struct acpi_device_physical_node *pn;
 143         bool second_pass = (bool)data;
 144         acpi_status status = AE_OK;
 145
 146         if (acpi_bus_get_device(handle, &device))
 147                 return AE_OK;
 148
 149         if (device->handler && !device->handler->hotplug.enabled) {
 150                 *ret_p = &device->dev;
 151                 return AE_SUPPORT;
 152         }
 153
 154         mutex_lock(&device->physical_node_lock);
 155
 156         list_for_each_entry(pn, &device->physical_node_list, node) {
 157                 int ret;
 158
 159                 if (second_pass) {
 160                         /* Skip devices offlined by the first pass. */
 161                         if (pn->put_online)
 162                                 continue;
 163                 } else {
 164                         pn->put_online = false;
 165                 }
 166                 ret = device_offline(pn->dev);
 167                 if (ret >= 0) {
 168                         pn->put_online = !ret;
 169                 } else {
 170                         *ret_p = pn->dev;
 171                         if (second_pass) {
 172                                 status = AE_ERROR;
 173                                 break;
 174                         }
 175                 }
 176         }
 177
 178         mutex_unlock(&device->physical_node_lock);
 179
 180         return status;
 181 }
 182
 183 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 184                                    void **ret_p)
 185 {
 186         struct acpi_device *device = NULL;
 187         struct acpi_device_physical_node *pn;
 188
 189         if (acpi_bus_get_device(handle, &device))
 190                 return AE_OK;
 191
 192         mutex_lock(&device->physical_node_lock);
 193
 194         list_for_each_entry(pn, &device->physical_node_list, node)
 195                 if (pn->put_online) {
 196                         device_online(pn->dev);
 197                         pn->put_online = false;
 198                 }
 199
 200         mutex_unlock(&device->physical_node_lock);
 201
 202         return AE_OK;
 203 }
 204
 205 static int acpi_scan_try_to_offline(struct acpi_device *device)
 206 {
 207         acpi_handle handle = device->handle;
 208         struct device *errdev = NULL;
 209         acpi_status status;
 210
 211         /*
 212          * Carry out two passes here and ignore errors in the first pass,
 213          * because if the devices in question are memory blocks and
 214          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 215          * that the other blocks depend on, but it is not known in advance which
 216          * block holds them.
 217          *
 218          * If the first pass is successful, the second one isn't needed, though.
 219          */
 220         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 221                                      NULL, acpi_bus_offline, (void *)false,
 222                                      (void **)&errdev);
 223         if (status == AE_SUPPORT) {
 224                 dev_warn(errdev, "Offline disabled.\n");
 225                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 226                                     acpi_bus_online, NULL, NULL, NULL);
 227                 return -EPERM;
 228         }
 229         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
 230         if (errdev) {
 231                 errdev = NULL;
 232                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 233                                     NULL, acpi_bus_offline, (void *)true,
 234                                     (void **)&errdev);
 235                 if (!errdev)
 236                         acpi_bus_offline(handle, 0, (void *)true,
 237                                          (void **)&errdev);
 238
 239                 if (errdev) {
 240                         dev_warn(errdev, "Offline failed.\n");
 241                         acpi_bus_online(handle, 0, NULL, NULL);
 242                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 243                                             ACPI_UINT32_MAX, acpi_bus_online,
 244                                             NULL, NULL, NULL);
 245                         return -EBUSY;
 246                 }
 247         }
 248         return 0;
 249 }
 250
 251 static int acpi_scan_hot_remove(struct acpi_device *device)
 252 {
 253         acpi_handle handle = device->handle;
 254         unsigned long long sta;
 255         acpi_status status;
 256
 257         if (device->handler && device->handler->hotplug.demand_offline) {
 258                 if (!acpi_scan_is_offline(device, true))
 259                         return -EBUSY;
 260         } else {
 261                 int error = acpi_scan_try_to_offline(device);
 262                 if (error)
 263                         return error;
 264         }
 265
 266         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 267                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 268
 269         acpi_bus_trim(device);
 270
 271         acpi_evaluate_lck(handle, 0);
 272         /*
 273          * TBD: _EJD support.
 274          */
 275         status = acpi_evaluate_ej0(handle);
 276         if (status == AE_NOT_FOUND)
 277                 return -ENODEV;
 278         else if (ACPI_FAILURE(status))
 279                 return -EIO;
 280
 281         /*
 282          * Verify if eject was indeed successful.  If not, log an error
 283          * message.  No need to call _OST since _EJ0 call was made OK.
 284          */
 285         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 286         if (ACPI_FAILURE(status)) {
 287                 acpi_handle_warn(handle,
 288                         "Status check after eject failed (0x%x)\n", status);
 289         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 290                 acpi_handle_warn(handle,
 291                         "Eject incomplete - status 0x%llx\n", sta);
 292         }
 293
 294         return 0;
 295 }
 296
 297 static int acpi_scan_device_not_present(struct acpi_device *adev)
 298 {
 299         if (!acpi_device_enumerated(adev)) {
 300                 dev_warn(&adev->dev, "Still not present\n");
 301                 return -EALREADY;
 302         }
 303         acpi_bus_trim(adev);
 304         return 0;
 305 }
 306
 307 static int acpi_scan_device_check(struct acpi_device *adev)
 308 {
 309         int error;
 310
 311         acpi_bus_get_status(adev);
 312         if (adev->status.present || adev->status.functional) {
 313                 /*
 314                  * This function is only called for device objects for which
 315                  * matching scan handlers exist.  The only situation in which
 316                  * the scan handler is not attached to this device object yet
 317                  * is when the device has just appeared (either it wasn't
 318                  * present at all before or it was removed and then added
 319                  * again).
 320                  */
 321                 if (adev->handler) {
 322                         dev_warn(&adev->dev, "Already enumerated\n");
 323                         return -EALREADY;
 324                 }
 325                 error = acpi_bus_scan(adev->handle);
 326                 if (error) {
 327                         dev_warn(&adev->dev, "Namespace scan failure\n");
 328                         return error;
 329                 }
 330                 if (!adev->handler) {
 331                         dev_warn(&adev->dev, "Enumeration failure\n");
 332                         error = -ENODEV;
 333                 }
 334         } else {
 335                 error = acpi_scan_device_not_present(adev);
 336         }
 337         return error;
 338 }
 339
 340 static int acpi_scan_bus_check(struct acpi_device *adev)
 341 {
 342         struct acpi_scan_handler *handler = adev->handler;
 343         struct acpi_device *child;
 344         int error;
 345
 346         acpi_bus_get_status(adev);
 347         if (!(adev->status.present || adev->status.functional)) {
 348                 acpi_scan_device_not_present(adev);
 349                 return 0;
 350         }
 351         if (handler && handler->hotplug.scan_dependent)
 352                 return handler->hotplug.scan_dependent(adev);
 353
 354         error = acpi_bus_scan(adev->handle);
 355         if (error) {
 356                 dev_warn(&adev->dev, "Namespace scan failure\n");
 357                 return error;
 358         }
 359         list_for_each_entry(child, &adev->children, node) {
 360                 error = acpi_scan_bus_check(child);
 361                 if (error)
 362                         return error;
 363         }
 364         return 0;
 365 }
 366
 367 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 368 {
 369         switch (type) {
 370         case ACPI_NOTIFY_BUS_CHECK:
 371                 return acpi_scan_bus_check(adev);
 372         case ACPI_NOTIFY_DEVICE_CHECK:
 373                 return acpi_scan_device_check(adev);
 374         case ACPI_NOTIFY_EJECT_REQUEST:
 375         case ACPI_OST_EC_OSPM_EJECT:
 376                 if (adev->handler && !adev->handler->hotplug.enabled) {
 377                         dev_info(&adev->dev, "Eject disabled\n");
 378                         return -EPERM;
 379                 }
 380                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 381                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 382                 return acpi_scan_hot_remove(adev);
 383         }
 384         return -EINVAL;
 385 }
 386
 387 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 388 {
 389         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 390         int error = -ENODEV;
 391
 392         lock_device_hotplug();
 393         mutex_lock(&acpi_scan_lock);
 394
 395         /*
 396          * The device object's ACPI handle cannot become invalid as long as we
 397          * are holding acpi_scan_lock, but it might have become invalid before
 398          * that lock was acquired.
 399          */
 400         if (adev->handle == INVALID_ACPI_HANDLE)
 401                 goto err_out;
 402
 403         if (adev->flags.is_dock_station) {
 404                 error = dock_notify(adev, src);
 405         } else if (adev->flags.hotplug_notify) {
 406                 error = acpi_generic_hotplug_event(adev, src);
 407         } else {
 408                 int (*notify)(struct acpi_device *, u32);
 409
 410                 acpi_lock_hp_context();
 411                 notify = adev->hp ? adev->hp->notify : NULL;
 412                 acpi_unlock_hp_context();
 413                 /*
 414                  * There may be additional notify handlers for device objects
 415                  * without the .event() callback, so ignore them here.
 416                  */
 417                 if (notify)
 418                         error = notify(adev, src);
 419                 else
 420                         goto out;
 421         }
 422         switch (error) {
 423         case 0:
 424                 ost_code = ACPI_OST_SC_SUCCESS;
 425                 break;
 426         case -EPERM:
 427                 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 428                 break;
 429         case -EBUSY:
 430                 ost_code = ACPI_OST_SC_DEVICE_BUSY;
 431                 break;
 432         default:
 433                 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 434                 break;
 435         }
 436
 437  err_out:
 438         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 439
 440  out:
 441         acpi_bus_put_acpi_device(adev);
 442         mutex_unlock(&acpi_scan_lock);
 443         unlock_device_hotplug();
 444 }
 445
 446 static void acpi_free_power_resources_lists(struct acpi_device *device)
 447 {
 448         int i;
 449
 450         if (device->wakeup.flags.valid)
 451                 acpi_power_resources_list_free(&device->wakeup.resources);
 452
 453         if (!device->power.flags.power_resources)
 454                 return;
 455
 456         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 457                 struct acpi_device_power_state *ps = &device->power.states[i];
 458                 acpi_power_resources_list_free(&ps->resources);
 459         }
 460 }
 461
 462 static void acpi_device_release(struct device *dev)
 463 {
 464         struct acpi_device *acpi_dev = to_acpi_device(dev);
 465
 466         acpi_free_properties(acpi_dev);
 467         acpi_free_pnp_ids(&acpi_dev->pnp);
 468         acpi_free_power_resources_lists(acpi_dev);
 469         kfree(acpi_dev);
 470 }
 471
 472 static void acpi_device_del(struct acpi_device *device)
 473 {
 474         struct acpi_device_bus_id *acpi_device_bus_id;
 475
 476         mutex_lock(&acpi_device_lock);
 477         if (device->parent)
 478                 list_del(&device->node);
 479
 480         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
 481                 if (!strcmp(acpi_device_bus_id->bus_id,
 482                             acpi_device_hid(device))) {
 483                         if (acpi_device_bus_id->instance_no > 0)
 484                                 acpi_device_bus_id->instance_no--;
 485                         else {
 486                                 list_del(&acpi_device_bus_id->node);
 487                                 kfree(acpi_device_bus_id);
 488                         }
 489                         break;
 490                 }
 491
 492         list_del(&device->wakeup_list);
 493         mutex_unlock(&acpi_device_lock);
 494
 495         acpi_power_add_remove_device(device, false);
 496         acpi_device_remove_files(device);
 497         if (device->remove)
 498                 device->remove(device);
 499
 500         device_del(&device->dev);
 501 }
 502
 503 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
 504
 505 static LIST_HEAD(acpi_device_del_list);
 506 static DEFINE_MUTEX(acpi_device_del_lock);
 507
 508 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 509 {
 510         for (;;) {
 511                 struct acpi_device *adev;
 512
 513                 mutex_lock(&acpi_device_del_lock);
 514
 515                 if (list_empty(&acpi_device_del_list)) {
 516                         mutex_unlock(&acpi_device_del_lock);
 517                         break;
 518                 }
 519                 adev = list_first_entry(&acpi_device_del_list,
 520                                         struct acpi_device, del_list);
 521                 list_del(&adev->del_list);
 522
 523                 mutex_unlock(&acpi_device_del_lock);
 524
 525                 blocking_notifier_call_chain(&acpi_reconfig_chain,
 526                                              ACPI_RECONFIG_DEVICE_REMOVE, adev);
 527
 528                 acpi_device_del(adev);
 529                 /*
 530                  * Drop references to all power resources that might have been
 531                  * used by the device.
 532                  */
 533                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
 534                 put_device(&adev->dev);
 535         }
 536 }
 537
 538 /**
 539  * acpi_scan_drop_device - Drop an ACPI device object.
 540  * @handle: Handle of an ACPI namespace node, not used.
 541  * @context: Address of the ACPI device object to drop.
 542  *
 543  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
 544  * namespace node the device object pointed to by @context is attached to.
 545  *
 546  * The unregistration is carried out asynchronously to avoid running
 547  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
 548  * ensure the correct ordering (the device objects must be unregistered in the
 549  * same order in which the corresponding namespace nodes are deleted).
 550  */
 551 static void acpi_scan_drop_device(acpi_handle handle, void *context)
 552 {
 553         static DECLARE_WORK(work, acpi_device_del_work_fn);
 554         struct acpi_device *adev = context;
 555
 556         mutex_lock(&acpi_device_del_lock);
 557
 558         /*
 559          * Use the ACPI hotplug workqueue which is ordered, so this work item
 560          * won't run after any hotplug work items submitted subsequently.  That
 561          * prevents attempts to register device objects identical to those being
 562          * deleted from happening concurrently (such attempts result from
 563          * hotplug events handled via the ACPI hotplug workqueue).  It also will
 564          * run after all of the work items submitted previosuly, which helps
 565          * those work items to ensure that they are not accessing stale device
 566          * objects.
 567          */
 568         if (list_empty(&acpi_device_del_list))
 569                 acpi_queue_hotplug_work(&work);
 570
 571         list_add_tail(&adev->del_list, &acpi_device_del_list);
 572         /* Make acpi_ns_validate_handle() return NULL for this handle. */
 573         adev->handle = INVALID_ACPI_HANDLE;
 574
 575         mutex_unlock(&acpi_device_del_lock);
 576 }
 577
 578 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
 579                                 void (*callback)(void *))
 580 {
 581         acpi_status status;
 582
 583         if (!device)
 584                 return -EINVAL;
 585
 586         status = acpi_get_data_full(handle, acpi_scan_drop_device,
 587                                     (void **)device, callback);
 588         if (ACPI_FAILURE(status) || !*device) {
 589                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 590                                   handle));
 591                 return -ENODEV;
 592         }
 593         return 0;
 594 }
 595
 596 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 597 {
 598         return acpi_get_device_data(handle, device, NULL);
 599 }
 600 EXPORT_SYMBOL(acpi_bus_get_device);
 601
 602 static void get_acpi_device(void *dev)
 603 {
 604         if (dev)
 605                 get_device(&((struct acpi_device *)dev)->dev);
 606 }
 607
 608 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 609 {
 610         struct acpi_device *adev = NULL;
 611
 612         acpi_get_device_data(handle, &adev, get_acpi_device);
 613         return adev;
 614 }
 615
 616 void acpi_bus_put_acpi_device(struct acpi_device *adev)
 617 {
 618         put_device(&adev->dev);
 619 }
 620
 621 int acpi_device_add(struct acpi_device *device,
 622                     void (*release)(struct device *))
 623 {
 624         int result;
 625         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 626         int found = 0;
 627
 628         if (device->handle) {
 629                 acpi_status status;
 630
 631                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
 632                                           device);
 633                 if (ACPI_FAILURE(status)) {
 634                         acpi_handle_err(device->handle,
 635                                         "Unable to attach device data\n");
 636                         return -ENODEV;
 637                 }
 638         }
 639
 640         /*
 641          * Linkage
 642          * -------
 643          * Link this device to its parent and siblings.
 644          */
 645         INIT_LIST_HEAD(&device->children);
 646         INIT_LIST_HEAD(&device->node);
 647         INIT_LIST_HEAD(&device->wakeup_list);
 648         INIT_LIST_HEAD(&device->physical_node_list);
 649         INIT_LIST_HEAD(&device->del_list);
 650         mutex_init(&device->physical_node_lock);
 651
 652         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 653         if (!new_bus_id) {
 654                 pr_err(PREFIX "Memory allocation error\n");
 655                 result = -ENOMEM;
 656                 goto err_detach;
 657         }
 658
 659         mutex_lock(&acpi_device_lock);
 660         /*
 661          * Find suitable bus_id and instance number in acpi_bus_id_list
 662          * If failed, create one and link it into acpi_bus_id_list
 663          */
 664         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 665                 if (!strcmp(acpi_device_bus_id->bus_id,
 666                             acpi_device_hid(device))) {
 667                         acpi_device_bus_id->instance_no++;
 668                         found = 1;
 669                         kfree(new_bus_id);
 670                         break;
 671                 }
 672         }
 673         if (!found) {
 674                 acpi_device_bus_id = new_bus_id;
 675                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 676                 acpi_device_bus_id->instance_no = 0;
 677                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 678         }
 679         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 680
 681         if (device->parent)
 682                 list_add_tail(&device->node, &device->parent->children);
 683
 684         if (device->wakeup.flags.valid)
 685                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 686         mutex_unlock(&acpi_device_lock);
 687
 688         if (device->parent)
 689                 device->dev.parent = &device->parent->dev;
 690         device->dev.bus = &acpi_bus_type;
 691         device->dev.release = release;
 692         result = device_add(&device->dev);
 693         if (result) {
 694                 dev_err(&device->dev, "Error registering device\n");
 695                 goto err;
 696         }
 697
 698         result = acpi_device_setup_files(device);
 699         if (result)
 700                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 701                        dev_name(&device->dev));
 702
 703         return 0;
 704
 705  err:
 706         mutex_lock(&acpi_device_lock);
 707         if (device->parent)
 708                 list_del(&device->node);
 709         list_del(&device->wakeup_list);
 710         mutex_unlock(&acpi_device_lock);
 711
 712  err_detach:
 713         acpi_detach_data(device->handle, acpi_scan_drop_device);
 714         return result;
 715 }
 716
 717 /* --------------------------------------------------------------------------
 718                                  Device Enumeration
 719    -------------------------------------------------------------------------- */
 720 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 721 {
 722         struct acpi_device *device = NULL;
 723         acpi_status status;
 724
 725         /*
 726          * Fixed hardware devices do not appear in the namespace and do not
 727          * have handles, but we fabricate acpi_devices for them, so we have
 728          * to deal with them specially.
 729          */
 730         if (!handle)
 731                 return acpi_root;
 732
 733         do {
 734                 status = acpi_get_parent(handle, &handle);
 735                 if (ACPI_FAILURE(status))
 736                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 737         } while (acpi_bus_get_device(handle, &device));
 738         return device;
 739 }
 740
 741 acpi_status
 742 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 743 {
 744         acpi_status status;
 745         acpi_handle tmp;
 746         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 747         union acpi_object *obj;
 748
 749         status = acpi_get_handle(handle, "_EJD", &tmp);
 750         if (ACPI_FAILURE(status))
 751                 return status;
 752
 753         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 754         if (ACPI_SUCCESS(status)) {
 755                 obj = buffer.pointer;
 756                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 757                                          ejd);
 758                 kfree(buffer.pointer);
 759         }
 760         return status;
 761 }
 762 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 763
 764 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 765                                         struct acpi_device_wakeup *wakeup)
 766 {
 767         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 768         union acpi_object *package = NULL;
 769         union acpi_object *element = NULL;
 770         acpi_status status;
 771         int err = -ENODATA;
 772
 773         if (!wakeup)
 774                 return -EINVAL;
 775
 776         INIT_LIST_HEAD(&wakeup->resources);
 777
 778         /* _PRW */
 779         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 780         if (ACPI_FAILURE(status)) {
 781                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 782                 return err;
 783         }
 784
 785         package = (union acpi_object *)buffer.pointer;
 786
 787         if (!package || package->package.count < 2)
 788                 goto out;
 789
 790         element = &(package->package.elements[0]);
 791         if (!element)
 792                 goto out;
 793
 794         if (element->type == ACPI_TYPE_PACKAGE) {
 795                 if ((element->package.count < 2) ||
 796                     (element->package.elements[0].type !=
 797                      ACPI_TYPE_LOCAL_REFERENCE)
 798                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 799                         goto out;
 800
 801                 wakeup->gpe_device =
 802                     element->package.elements[0].reference.handle;
 803                 wakeup->gpe_number =
 804                     (u32) element->package.elements[1].integer.value;
 805         } else if (element->type == ACPI_TYPE_INTEGER) {
 806                 wakeup->gpe_device = NULL;
 807                 wakeup->gpe_number = element->integer.value;
 808         } else {
 809                 goto out;
 810         }
 811
 812         element = &(package->package.elements[1]);
 813         if (element->type != ACPI_TYPE_INTEGER)
 814                 goto out;
 815
 816         wakeup->sleep_state = element->integer.value;
 817
 818         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 819         if (err)
 820                 goto out;
 821
 822         if (!list_empty(&wakeup->resources)) {
 823                 int sleep_state;
 824
 825                 err = acpi_power_wakeup_list_init(&wakeup->resources,
 826                                                   &sleep_state);
 827                 if (err) {
 828                         acpi_handle_warn(handle, "Retrieving current states "
 829                                          "of wakeup power resources failed\n");
 830                         acpi_power_resources_list_free(&wakeup->resources);
 831                         goto out;
 832                 }
 833                 if (sleep_state < wakeup->sleep_state) {
 834                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
 835                                          "(S%d) by S%d from power resources\n",
 836                                          (int)wakeup->sleep_state, sleep_state);
 837                         wakeup->sleep_state = sleep_state;
 838                 }
 839         }
 840
 841  out:
 842         kfree(buffer.pointer);
 843         return err;
 844 }
 845
 846 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
 847 {
 848         static const struct acpi_device_id button_device_ids[] = {
 849                 {"PNP0C0C", 0},
 850                 {"PNP0C0D", 0},
 851                 {"PNP0C0E", 0},
 852                 {"", 0},
 853         };
 854         struct acpi_device_wakeup *wakeup = &device->wakeup;
 855         acpi_status status;
 856
 857         wakeup->flags.notifier_present = 0;
 858
 859         /* Power button, Lid switch always enable wakeup */
 860         if (!acpi_match_device_ids(device, button_device_ids)) {
 861                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 862                         /* Do not use Lid/sleep button for S5 wakeup */
 863                         if (wakeup->sleep_state == ACPI_STATE_S5)
 864                                 wakeup->sleep_state = ACPI_STATE_S4;
 865                 }
 866                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 867                 device_set_wakeup_capable(&device->dev, true);
 868                 return true;
 869         }
 870
 871         status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 872                                          wakeup->gpe_number);
 873         return ACPI_SUCCESS(status);
 874 }
 875
 876 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 877 {
 878         int err;
 879
 880         /* Presence of _PRW indicates wake capable */
 881         if (!acpi_has_method(device->handle, "_PRW"))
 882                 return;
 883
 884         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
 885                                                            &device->wakeup);
 886         if (err) {
 887                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
 888                 return;
 889         }
 890
 891         device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
 892         device->wakeup.prepare_count = 0;
 893         /*
 894          * Call _PSW/_DSW object to disable its ability to wake the sleeping
 895          * system for the ACPI device with the _PRW object.
 896          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 897          * So it is necessary to call _DSW object first. Only when it is not
 898          * present will the _PSW object used.
 899          */
 900         err = acpi_device_sleep_wake(device, 0, 0, 0);
 901         if (err)
 902                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 903                                 "error in _DSW or _PSW evaluation\n"));
 904 }
 905
 906 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 907 {
 908         struct acpi_device_power_state *ps = &device->power.states[state];
 909         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 910         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 911         acpi_status status;
 912
 913         INIT_LIST_HEAD(&ps->resources);
 914
 915         /* Evaluate "_PRx" to get referenced power resources */
 916         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 917         if (ACPI_SUCCESS(status)) {
 918                 union acpi_object *package = buffer.pointer;
 919
 920                 if (buffer.length && package
 921                     && package->type == ACPI_TYPE_PACKAGE
 922                     && package->package.count) {
 923                         int err = acpi_extract_power_resources(package, 0,
 924                                                                &ps->resources);
 925                         if (!err)
 926                                 device->power.flags.power_resources = 1;
 927                 }
 928                 ACPI_FREE(buffer.pointer);
 929         }
 930
 931         /* Evaluate "_PSx" to see if we can do explicit sets */
 932         pathname[2] = 'S';
 933         if (acpi_has_method(device->handle, pathname))
 934                 ps->flags.explicit_set = 1;
 935
 936         /* State is valid if there are means to put the device into it. */
 937         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
 938                 ps->flags.valid = 1;
 939
 940         ps->power = -1;         /* Unknown - driver assigned */
 941         ps->latency = -1;       /* Unknown - driver assigned */
 942 }
 943
 944 static void acpi_bus_get_power_flags(struct acpi_device *device)
 945 {
 946         u32 i;
 947
 948         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 949         if (!acpi_has_method(device->handle, "_PS0") &&
 950             !acpi_has_method(device->handle, "_PR0"))
 951                 return;
 952
 953         device->flags.power_manageable = 1;
 954
 955         /*
 956          * Power Management Flags
 957          */
 958         if (acpi_has_method(device->handle, "_PSC"))
 959                 device->power.flags.explicit_get = 1;
 960
 961         if (acpi_has_method(device->handle, "_IRC"))
 962                 device->power.flags.inrush_current = 1;
 963
 964         if (acpi_has_method(device->handle, "_DSW"))
 965                 device->power.flags.dsw_present = 1;
 966
 967         /*
 968          * Enumerate supported power management states
 969          */
 970         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
 971                 acpi_bus_init_power_state(device, i);
 972
 973         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
 974         if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
 975                 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
 976
 977         /* Set defaults for D0 and D3hot states (always valid) */
 978         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 979         device->power.states[ACPI_STATE_D0].power = 100;
 980         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
 981
 982         if (acpi_bus_init_power(device))
 983                 device->flags.power_manageable = 0;
 984 }
 985
 986 static void acpi_bus_get_flags(struct acpi_device *device)
 987 {
 988         /* Presence of _STA indicates 'dynamic_status' */
 989         if (acpi_has_method(device->handle, "_STA"))
 990                 device->flags.dynamic_status = 1;
 991
 992         /* Presence of _RMV indicates 'removable' */
 993         if (acpi_has_method(device->handle, "_RMV"))
 994                 device->flags.removable = 1;
 995
 996         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 997         if (acpi_has_method(device->handle, "_EJD") ||
 998             acpi_has_method(device->handle, "_EJ0"))
 999                 device->flags.ejectable = 1;
1000 }
1001
1002 static void acpi_device_get_busid(struct acpi_device *device)
1003 {
1004         char bus_id[5] = { '?', 0 };
1005         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1006         int i = 0;
1007
1008         /*
1009          * Bus ID
1010          * ------
1011          * The device's Bus ID is simply the object name.
1012          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1013          */
1014         if (ACPI_IS_ROOT_DEVICE(device)) {
1015                 strcpy(device->pnp.bus_id, "ACPI");
1016                 return;
1017         }
1018
1019         switch (device->device_type) {
1020         case ACPI_BUS_TYPE_POWER_BUTTON:
1021                 strcpy(device->pnp.bus_id, "PWRF");
1022                 break;
1023         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1024                 strcpy(device->pnp.bus_id, "SLPF");
1025                 break;
1026         default:
1027                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1028                 /* Clean up trailing underscores (if any) */
1029                 for (i = 3; i > 1; i--) {
1030                         if (bus_id[i] == '_')
1031                                 bus_id[i] = '\0';
1032                         else
1033                                 break;
1034                 }
1035                 strcpy(device->pnp.bus_id, bus_id);
1036                 break;
1037         }
1038 }
1039
1040 /*
1041  * acpi_ata_match - see if an acpi object is an ATA device
1042  *
1043  * If an acpi object has one of the ACPI ATA methods defined,
1044  * then we can safely call it an ATA device.
1045  */
1046 bool acpi_ata_match(acpi_handle handle)
1047 {
1048         return acpi_has_method(handle, "_GTF") ||
1049                acpi_has_method(handle, "_GTM") ||
1050                acpi_has_method(handle, "_STM") ||
1051                acpi_has_method(handle, "_SDD");
1052 }
1053
1054 /*
1055  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1056  *
1057  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1058  * then we can safely call it an ejectable drive bay
1059  */
1060 bool acpi_bay_match(acpi_handle handle)
1061 {
1062         acpi_handle phandle;
1063
1064         if (!acpi_has_method(handle, "_EJ0"))
1065                 return false;
1066         if (acpi_ata_match(handle))
1067                 return true;
1068         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1069                 return false;
1070
1071         return acpi_ata_match(phandle);
1072 }
1073
1074 bool acpi_device_is_battery(struct acpi_device *adev)
1075 {
1076         struct acpi_hardware_id *hwid;
1077
1078         list_for_each_entry(hwid, &adev->pnp.ids, list)
1079                 if (!strcmp("PNP0C0A", hwid->id))
1080                         return true;
1081
1082         return false;
1083 }
1084
1085 static bool is_ejectable_bay(struct acpi_device *adev)
1086 {
1087         acpi_handle handle = adev->handle;
1088
1089         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1090                 return true;
1091
1092         return acpi_bay_match(handle);
1093 }
1094
1095 /*
1096  * acpi_dock_match - see if an acpi object has a _DCK method
1097  */
1098 bool acpi_dock_match(acpi_handle handle)
1099 {
1100         return acpi_has_method(handle, "_DCK");
1101 }
1102
1103 static acpi_status
1104 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1105                           void **return_value)
1106 {
1107         long *cap = context;
1108
1109         if (acpi_has_method(handle, "_BCM") &&
1110             acpi_has_method(handle, "_BCL")) {
1111                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1112                                   "support\n"));
1113                 *cap |= ACPI_VIDEO_BACKLIGHT;
1114                 /* We have backlight support, no need to scan further */
1115                 return AE_CTRL_TERMINATE;
1116         }
1117         return 0;
1118 }
1119
1120 /* Returns true if the ACPI object is a video device which can be
1121  * handled by video.ko.
1122  * The device will get a Linux specific CID added in scan.c to
1123  * identify the device as an ACPI graphics device
1124  * Be aware that the graphics device may not be physically present
1125  * Use acpi_video_get_capabilities() to detect general ACPI video
1126  * capabilities of present cards
1127  */
1128 long acpi_is_video_device(acpi_handle handle)
1129 {
1130         long video_caps = 0;
1131
1132         /* Is this device able to support video switching ? */
1133         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1134                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1135
1136         /* Is this device able to retrieve a video ROM ? */
1137         if (acpi_has_method(handle, "_ROM"))
1138                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1139
1140         /* Is this device able to configure which video head to be POSTed ? */
1141         if (acpi_has_method(handle, "_VPO") &&
1142             acpi_has_method(handle, "_GPD") &&
1143             acpi_has_method(handle, "_SPD"))
1144                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1145
1146         /* Only check for backlight functionality if one of the above hit. */
1147         if (video_caps)
1148                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1149                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1150                                     &video_caps, NULL);
1151
1152         return video_caps;
1153 }
1154 EXPORT_SYMBOL(acpi_is_video_device);
1155
1156 const char *acpi_device_hid(struct acpi_device *device)
1157 {
1158         struct acpi_hardware_id *hid;
1159
1160         if (list_empty(&device->pnp.ids))
1161                 return dummy_hid;
1162
1163         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1164         return hid->id;
1165 }
1166 EXPORT_SYMBOL(acpi_device_hid);
1167
1168 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1169 {
1170         struct acpi_hardware_id *id;
1171
1172         id = kmalloc(sizeof(*id), GFP_KERNEL);
1173         if (!id)
1174                 return;
1175
1176         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1177         if (!id->id) {
1178                 kfree(id);
1179                 return;
1180         }
1181
1182         list_add_tail(&id->list, &pnp->ids);
1183         pnp->type.hardware_id = 1;
1184 }
1185
1186 /*
1187  * Old IBM workstations have a DSDT bug wherein the SMBus object
1188  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1189  * prefix.  Work around this.
1190  */
1191 static bool acpi_ibm_smbus_match(acpi_handle handle)
1192 {
1193         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1194         struct acpi_buffer path = { sizeof(node_name), node_name };
1195
1196         if (!dmi_name_in_vendors("IBM"))
1197                 return false;
1198
1199         /* Look for SMBS object */
1200         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1201             strcmp("SMBS", path.pointer))
1202                 return false;
1203
1204         /* Does it have the necessary (but misnamed) methods? */
1205         if (acpi_has_method(handle, "SBI") &&
1206             acpi_has_method(handle, "SBR") &&
1207             acpi_has_method(handle, "SBW"))
1208                 return true;
1209
1210         return false;
1211 }
1212
1213 static bool acpi_object_is_system_bus(acpi_handle handle)
1214 {
1215         acpi_handle tmp;
1216
1217         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1218             tmp == handle)
1219                 return true;
1220         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1221             tmp == handle)
1222                 return true;
1223
1224         return false;
1225 }
1226
1227 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1228                                 int device_type)
1229 {
1230         acpi_status status;
1231         struct acpi_device_info *info;
1232         struct acpi_pnp_device_id_list *cid_list;
1233         int i;
1234
1235         switch (device_type) {
1236         case ACPI_BUS_TYPE_DEVICE:
1237                 if (handle == ACPI_ROOT_OBJECT) {
1238                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1239                         break;
1240                 }
1241
1242                 status = acpi_get_object_info(handle, &info);
1243                 if (ACPI_FAILURE(status)) {
1244                         pr_err(PREFIX "%s: Error reading device info\n",
1245                                         __func__);
1246                         return;
1247                 }
1248
1249                 if (info->valid & ACPI_VALID_HID) {
1250                         acpi_add_id(pnp, info->hardware_id.string);
1251                         pnp->type.platform_id = 1;
1252                 }
1253                 if (info->valid & ACPI_VALID_CID) {
1254                         cid_list = &info->compatible_id_list;
1255                         for (i = 0; i < cid_list->count; i++)
1256                                 acpi_add_id(pnp, cid_list->ids[i].string);
1257                 }
1258                 if (info->valid & ACPI_VALID_ADR) {
1259                         pnp->bus_address = info->address;
1260                         pnp->type.bus_address = 1;
1261                 }
1262                 if (info->valid & ACPI_VALID_UID)
1263                         pnp->unique_id = kstrdup(info->unique_id.string,
1264                                                         GFP_KERNEL);
1265                 if (info->valid & ACPI_VALID_CLS)
1266                         acpi_add_id(pnp, info->class_code.string);
1267
1268                 kfree(info);
1269
1270                 /*
1271                  * Some devices don't reliably have _HIDs & _CIDs, so add
1272                  * synthetic HIDs to make sure drivers can find them.
1273                  */
1274                 if (acpi_is_video_device(handle))
1275                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1276                 else if (acpi_bay_match(handle))
1277                         acpi_add_id(pnp, ACPI_BAY_HID);
1278                 else if (acpi_dock_match(handle))
1279                         acpi_add_id(pnp, ACPI_DOCK_HID);
1280                 else if (acpi_ibm_smbus_match(handle))
1281                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1282                 else if (list_empty(&pnp->ids) &&
1283                          acpi_object_is_system_bus(handle)) {
1284                         /* \_SB, \_TZ, LNXSYBUS */
1285                         acpi_add_id(pnp, ACPI_BUS_HID);
1286                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1287                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1288                 }
1289
1290                 break;
1291         case ACPI_BUS_TYPE_POWER:
1292                 acpi_add_id(pnp, ACPI_POWER_HID);
1293                 break;
1294         case ACPI_BUS_TYPE_PROCESSOR:
1295                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1296                 break;
1297         case ACPI_BUS_TYPE_THERMAL:
1298                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1299                 break;
1300         case ACPI_BUS_TYPE_POWER_BUTTON:
1301                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1302                 break;
1303         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1304                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1305                 break;
1306         }
1307 }
1308
1309 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1310 {
1311         struct acpi_hardware_id *id, *tmp;
1312
1313         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1314                 kfree_const(id->id);
1315                 kfree(id);
1316         }
1317         kfree(pnp->unique_id);
1318 }
1319
1320 /**
1321  * acpi_dma_supported - Check DMA support for the specified device.
1322  * @adev: The pointer to acpi device
1323  *
1324  * Return false if DMA is not supported. Otherwise, return true
1325  */
1326 bool acpi_dma_supported(struct acpi_device *adev)
1327 {
1328         if (!adev)
1329                 return false;
1330
1331         if (adev->flags.cca_seen)
1332                 return true;
1333
1334         /*
1335         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1336         * DMA on "Intel platforms".  Presumably that includes all x86 and
1337         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1338         */
1339         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1340                 return true;
1341
1342         return false;
1343 }
1344
1345 /**
1346  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1347  * @adev: The pointer to acpi device
1348  *
1349  * Return enum dev_dma_attr.
1350  */
1351 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1352 {
1353         if (!acpi_dma_supported(adev))
1354                 return DEV_DMA_NOT_SUPPORTED;
1355
1356         if (adev->flags.coherent_dma)
1357                 return DEV_DMA_COHERENT;
1358         else
1359                 return DEV_DMA_NON_COHERENT;
1360 }
1361
1362 /**
1363  * acpi_dma_configure - Set-up DMA configuration for the device.
1364  * @dev: The pointer to the device
1365  * @attr: device dma attributes
1366  */
1367 int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
1368 {
1369         const struct iommu_ops *iommu;
1370         u64 size;
1371
1372         iort_set_dma_mask(dev);
1373
1374         iommu = iort_iommu_configure(dev);
1375         if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
1376                 return -EPROBE_DEFER;
1377
1378         size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
1379         /*
1380          * Assume dma valid range starts at 0 and covers the whole
1381          * coherent_dma_mask.
1382          */
1383         arch_setup_dma_ops(dev, 0, size, iommu, attr == DEV_DMA_COHERENT);
1384
1385         return 0;
1386 }
1387 EXPORT_SYMBOL_GPL(acpi_dma_configure);
1388
1389 /**
1390  * acpi_dma_deconfigure - Tear-down DMA configuration for the device.
1391  * @dev: The pointer to the device
1392  */
1393 void acpi_dma_deconfigure(struct device *dev)
1394 {
1395         arch_teardown_dma_ops(dev);
1396 }
1397 EXPORT_SYMBOL_GPL(acpi_dma_deconfigure);
1398
1399 static void acpi_init_coherency(struct acpi_device *adev)
1400 {
1401         unsigned long long cca = 0;
1402         acpi_status status;
1403         struct acpi_device *parent = adev->parent;
1404
1405         if (parent && parent->flags.cca_seen) {
1406                 /*
1407                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1408                  * already saw one.
1409                  */
1410                 adev->flags.cca_seen = 1;
1411                 cca = parent->flags.coherent_dma;
1412         } else {
1413                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1414                                                NULL, &cca);
1415                 if (ACPI_SUCCESS(status))
1416                         adev->flags.cca_seen = 1;
1417                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1418                         /*
1419                          * If architecture does not specify that _CCA is
1420                          * required for DMA-able devices (e.g. x86),
1421                          * we default to _CCA=1.
1422                          */
1423                         cca = 1;
1424                 else
1425                         acpi_handle_debug(adev->handle,
1426                                           "ACPI device is missing _CCA.\n");
1427         }
1428
1429         adev->flags.coherent_dma = cca;
1430 }
1431
1432 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
1433 {
1434         bool *is_spi_i2c_slave_p = data;
1435
1436         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1437                 return 1;
1438
1439         /*
1440          * devices that are connected to UART still need to be enumerated to
1441          * platform bus
1442          */
1443         if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
1444                 *is_spi_i2c_slave_p = true;
1445
1446          /* no need to do more checking */
1447         return -1;
1448 }
1449
1450 static bool acpi_is_spi_i2c_slave(struct acpi_device *device)
1451 {
1452         struct list_head resource_list;
1453         bool is_spi_i2c_slave = false;
1454
1455         INIT_LIST_HEAD(&resource_list);
1456         acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
1457                                &is_spi_i2c_slave);
1458         acpi_dev_free_resource_list(&resource_list);
1459
1460         return is_spi_i2c_slave;
1461 }
1462
1463 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1464                              int type, unsigned long long sta)
1465 {
1466         INIT_LIST_HEAD(&device->pnp.ids);
1467         device->device_type = type;
1468         device->handle = handle;
1469         device->parent = acpi_bus_get_parent(handle);
1470         device->fwnode.type = FWNODE_ACPI;
1471         acpi_set_device_status(device, sta);
1472         acpi_device_get_busid(device);
1473         acpi_set_pnp_ids(handle, &device->pnp, type);
1474         acpi_init_properties(device);
1475         acpi_bus_get_flags(device);
1476         device->flags.match_driver = false;
1477         device->flags.initialized = true;
1478         device->flags.spi_i2c_slave = acpi_is_spi_i2c_slave(device);
1479         acpi_device_clear_enumerated(device);
1480         device_initialize(&device->dev);
1481         dev_set_uevent_suppress(&device->dev, true);
1482         acpi_init_coherency(device);
1483 }
1484
1485 void acpi_device_add_finalize(struct acpi_device *device)
1486 {
1487         dev_set_uevent_suppress(&device->dev, false);
1488         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1489 }
1490
1491 static int acpi_add_single_object(struct acpi_device **child,
1492                                   acpi_handle handle, int type,
1493                                   unsigned long long sta)
1494 {
1495         int result;
1496         struct acpi_device *device;
1497         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1498
1499         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1500         if (!device) {
1501                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1502                 return -ENOMEM;
1503         }
1504
1505         acpi_init_device_object(device, handle, type, sta);
1506         acpi_bus_get_power_flags(device);
1507         acpi_bus_get_wakeup_device_flags(device);
1508
1509         result = acpi_device_add(device, acpi_device_release);
1510         if (result) {
1511                 acpi_device_release(&device->dev);
1512                 return result;
1513         }
1514
1515         acpi_power_add_remove_device(device, true);
1516         acpi_device_add_finalize(device);
1517         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1518         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1519                 dev_name(&device->dev), (char *) buffer.pointer,
1520                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1521         kfree(buffer.pointer);
1522         *child = device;
1523         return 0;
1524 }
1525
1526 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1527                                             void *context)
1528 {
1529         struct resource *res = context;
1530
1531         if (acpi_dev_resource_memory(ares, res))
1532                 return AE_CTRL_TERMINATE;
1533
1534         return AE_OK;
1535 }
1536
1537 static bool acpi_device_should_be_hidden(acpi_handle handle)
1538 {
1539         acpi_status status;
1540         struct resource res;
1541
1542         /* Check if it should ignore the UART device */
1543         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1544                 return false;
1545
1546         /*
1547          * The UART device described in SPCR table is assumed to have only one
1548          * memory resource present. So we only look for the first one here.
1549          */
1550         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1551                                      acpi_get_resource_memory, &res);
1552         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1553                 return false;
1554
1555         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1556                          &res.start);
1557
1558         return true;
1559 }
1560
1561 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1562                                     unsigned long long *sta)
1563 {
1564         acpi_status status;
1565         acpi_object_type acpi_type;
1566
1567         status = acpi_get_type(handle, &acpi_type);
1568         if (ACPI_FAILURE(status))
1569                 return -ENODEV;
1570
1571         switch (acpi_type) {
1572         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1573         case ACPI_TYPE_DEVICE:
1574                 if (acpi_device_should_be_hidden(handle))
1575                         return -ENODEV;
1576
1577                 *type = ACPI_BUS_TYPE_DEVICE;
1578                 status = acpi_bus_get_status_handle(handle, sta);
1579                 if (ACPI_FAILURE(status))
1580                         *sta = 0;
1581                 break;
1582         case ACPI_TYPE_PROCESSOR:
1583                 *type = ACPI_BUS_TYPE_PROCESSOR;
1584                 status = acpi_bus_get_status_handle(handle, sta);
1585                 if (ACPI_FAILURE(status))
1586                         return -ENODEV;
1587                 break;
1588         case ACPI_TYPE_THERMAL:
1589                 *type = ACPI_BUS_TYPE_THERMAL;
1590                 *sta = ACPI_STA_DEFAULT;
1591                 break;
1592         case ACPI_TYPE_POWER:
1593                 *type = ACPI_BUS_TYPE_POWER;
1594                 *sta = ACPI_STA_DEFAULT;
1595                 break;
1596         default:
1597                 return -ENODEV;
1598         }
1599
1600         return 0;
1601 }
1602
1603 bool acpi_device_is_present(struct acpi_device *adev)
1604 {
1605         if (adev->status.present || adev->status.functional)
1606                 return true;
1607
1608         adev->flags.initialized = false;
1609         return false;
1610 }
1611
1612 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1613                                        const char *idstr,
1614                                        const struct acpi_device_id **matchid)
1615 {
1616         const struct acpi_device_id *devid;
1617
1618         if (handler->match)
1619                 return handler->match(idstr, matchid);
1620
1621         for (devid = handler->ids; devid->id[0]; devid++)
1622                 if (!strcmp((char *)devid->id, idstr)) {
1623                         if (matchid)
1624                                 *matchid = devid;
1625
1626                         return true;
1627                 }
1628
1629         return false;
1630 }
1631
1632 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1633                                         const struct acpi_device_id **matchid)
1634 {
1635         struct acpi_scan_handler *handler;
1636
1637         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1638                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1639                         return handler;
1640
1641         return NULL;
1642 }
1643
1644 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1645 {
1646         if (!!hotplug->enabled == !!val)
1647                 return;
1648
1649         mutex_lock(&acpi_scan_lock);
1650
1651         hotplug->enabled = val;
1652
1653         mutex_unlock(&acpi_scan_lock);
1654 }
1655
1656 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1657 {
1658         struct acpi_hardware_id *hwid;
1659
1660         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1661                 acpi_dock_add(adev);
1662                 return;
1663         }
1664         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1665                 struct acpi_scan_handler *handler;
1666
1667                 handler = acpi_scan_match_handler(hwid->id, NULL);
1668                 if (handler) {
1669                         adev->flags.hotplug_notify = true;
1670                         break;
1671                 }
1672         }
1673 }
1674
1675 static void acpi_device_dep_initialize(struct acpi_device *adev)
1676 {
1677         struct acpi_dep_data *dep;
1678         struct acpi_handle_list dep_devices;
1679         acpi_status status;
1680         int i;
1681
1682         if (!acpi_has_method(adev->handle, "_DEP"))
1683                 return;
1684
1685         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1686                                         &dep_devices);
1687         if (ACPI_FAILURE(status)) {
1688                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1689                 return;
1690         }
1691
1692         for (i = 0; i < dep_devices.count; i++) {
1693                 struct acpi_device_info *info;
1694                 int skip;
1695
1696                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1697                 if (ACPI_FAILURE(status)) {
1698                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1699                         continue;
1700                 }
1701
1702                 /*
1703                  * Skip the dependency of Windows System Power
1704                  * Management Controller
1705                  */
1706                 skip = info->valid & ACPI_VALID_HID &&
1707                         !strcmp(info->hardware_id.string, "INT3396");
1708
1709                 kfree(info);
1710
1711                 if (skip)
1712                         continue;
1713
1714                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1715                 if (!dep)
1716                         return;
1717
1718                 dep->master = dep_devices.handles[i];
1719                 dep->slave  = adev->handle;
1720                 adev->dep_unmet++;
1721
1722                 mutex_lock(&acpi_dep_list_lock);
1723                 list_add_tail(&dep->node , &acpi_dep_list);
1724                 mutex_unlock(&acpi_dep_list_lock);
1725         }
1726 }
1727
1728 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1729                                       void *not_used, void **return_value)
1730 {
1731         struct acpi_device *device = NULL;
1732         int type;
1733         unsigned long long sta;
1734         int result;
1735
1736         acpi_bus_get_device(handle, &device);
1737         if (device)
1738                 goto out;
1739
1740         result = acpi_bus_type_and_status(handle, &type, &sta);
1741         if (result)
1742                 return AE_OK;
1743
1744         if (type == ACPI_BUS_TYPE_POWER) {
1745                 acpi_add_power_resource(handle);
1746                 return AE_OK;
1747         }
1748
1749         acpi_add_single_object(&device, handle, type, sta);
1750         if (!device)
1751                 return AE_CTRL_DEPTH;
1752
1753         acpi_scan_init_hotplug(device);
1754         acpi_device_dep_initialize(device);
1755
1756  out:
1757         if (!*return_value)
1758                 *return_value = device;
1759
1760         return AE_OK;
1761 }
1762
1763 static void acpi_default_enumeration(struct acpi_device *device)
1764 {
1765         /*
1766          * Do not enumerate SPI/I2C slaves as they will be enumerated by their
1767          * respective parents.
1768          */
1769         if (!device->flags.spi_i2c_slave) {
1770                 acpi_create_platform_device(device, NULL);
1771                 acpi_device_set_enumerated(device);
1772         } else {
1773                 blocking_notifier_call_chain(&acpi_reconfig_chain,
1774                                              ACPI_RECONFIG_DEVICE_ADD, device);
1775         }
1776 }
1777
1778 static const struct acpi_device_id generic_device_ids[] = {
1779         {ACPI_DT_NAMESPACE_HID, },
1780         {"", },
1781 };
1782
1783 static int acpi_generic_device_attach(struct acpi_device *adev,
1784                                       const struct acpi_device_id *not_used)
1785 {
1786         /*
1787          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1788          * below can be unconditional.
1789          */
1790         if (adev->data.of_compatible)
1791                 acpi_default_enumeration(adev);
1792
1793         return 1;
1794 }
1795
1796 static struct acpi_scan_handler generic_device_handler = {
1797         .ids = generic_device_ids,
1798         .attach = acpi_generic_device_attach,
1799 };
1800
1801 static int acpi_scan_attach_handler(struct acpi_device *device)
1802 {
1803         struct acpi_hardware_id *hwid;
1804         int ret = 0;
1805
1806         list_for_each_entry(hwid, &device->pnp.ids, list) {
1807                 const struct acpi_device_id *devid;
1808                 struct acpi_scan_handler *handler;
1809
1810                 handler = acpi_scan_match_handler(hwid->id, &devid);
1811                 if (handler) {
1812                         if (!handler->attach) {
1813                                 device->pnp.type.platform_id = 0;
1814                                 continue;
1815                         }
1816                         device->handler = handler;
1817                         ret = handler->attach(device, devid);
1818                         if (ret > 0)
1819                                 break;
1820
1821                         device->handler = NULL;
1822                         if (ret < 0)
1823                                 break;
1824                 }
1825         }
1826
1827         return ret;
1828 }
1829
1830 static void acpi_bus_attach(struct acpi_device *device)
1831 {
1832         struct acpi_device *child;
1833         acpi_handle ejd;
1834         int ret;
1835
1836         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1837                 register_dock_dependent_device(device, ejd);
1838
1839         acpi_bus_get_status(device);
1840         /* Skip devices that are not present. */
1841         if (!acpi_device_is_present(device)) {
1842                 acpi_device_clear_enumerated(device);
1843                 device->flags.power_manageable = 0;
1844                 return;
1845         }
1846         if (device->handler)
1847                 goto ok;
1848
1849         if (!device->flags.initialized) {
1850                 device->flags.power_manageable =
1851                         device->power.states[ACPI_STATE_D0].flags.valid;
1852                 if (acpi_bus_init_power(device))
1853                         device->flags.power_manageable = 0;
1854
1855                 device->flags.initialized = true;
1856         } else if (device->flags.visited) {
1857                 goto ok;
1858         }
1859
1860         ret = acpi_scan_attach_handler(device);
1861         if (ret < 0)
1862                 return;
1863
1864         device->flags.match_driver = true;
1865         if (ret > 0 && !device->flags.spi_i2c_slave) {
1866                 acpi_device_set_enumerated(device);
1867                 goto ok;
1868         }
1869
1870         ret = device_attach(&device->dev);
1871         if (ret < 0)
1872                 return;
1873
1874         if (!device->pnp.type.platform_id && !device->flags.spi_i2c_slave)
1875                 acpi_device_set_enumerated(device);
1876         else
1877                 acpi_default_enumeration(device);
1878
1879  ok:
1880         list_for_each_entry(child, &device->children, node)
1881                 acpi_bus_attach(child);
1882
1883         if (device->handler && device->handler->hotplug.notify_online)
1884                 device->handler->hotplug.notify_online(device);
1885 }
1886
1887 void acpi_walk_dep_device_list(acpi_handle handle)
1888 {
1889         struct acpi_dep_data *dep, *tmp;
1890         struct acpi_device *adev;
1891
1892         mutex_lock(&acpi_dep_list_lock);
1893         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
1894                 if (dep->master == handle) {
1895                         acpi_bus_get_device(dep->slave, &adev);
1896                         if (!adev)
1897                                 continue;
1898
1899                         adev->dep_unmet--;
1900                         if (!adev->dep_unmet)
1901                                 acpi_bus_attach(adev);
1902                         list_del(&dep->node);
1903                         kfree(dep);
1904                 }
1905         }
1906         mutex_unlock(&acpi_dep_list_lock);
1907 }
1908 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
1909
1910 /**
1911  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1912  * @handle: Root of the namespace scope to scan.
1913  *
1914  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1915  * found devices.
1916  *
1917  * If no devices were found, -ENODEV is returned, but it does not mean that
1918  * there has been a real error.  There just have been no suitable ACPI objects
1919  * in the table trunk from which the kernel could create a device and add an
1920  * appropriate driver.
1921  *
1922  * Must be called under acpi_scan_lock.
1923  */
1924 int acpi_bus_scan(acpi_handle handle)
1925 {
1926         void *device = NULL;
1927
1928         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1929                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1930                                     acpi_bus_check_add, NULL, NULL, &device);
1931
1932         if (device) {
1933                 acpi_bus_attach(device);
1934                 return 0;
1935         }
1936         return -ENODEV;
1937 }
1938 EXPORT_SYMBOL(acpi_bus_scan);
1939
1940 /**
1941  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
1942  * @adev: Root of the ACPI namespace scope to walk.
1943  *
1944  * Must be called under acpi_scan_lock.
1945  */
1946 void acpi_bus_trim(struct acpi_device *adev)
1947 {
1948         struct acpi_scan_handler *handler = adev->handler;
1949         struct acpi_device *child;
1950
1951         list_for_each_entry_reverse(child, &adev->children, node)
1952                 acpi_bus_trim(child);
1953
1954         adev->flags.match_driver = false;
1955         if (handler) {
1956                 if (handler->detach)
1957                         handler->detach(adev);
1958
1959                 adev->handler = NULL;
1960         } else {
1961                 device_release_driver(&adev->dev);
1962         }
1963         /*
1964          * Most likely, the device is going away, so put it into D3cold before
1965          * that.
1966          */
1967         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
1968         adev->flags.initialized = false;
1969         acpi_device_clear_enumerated(adev);
1970 }
1971 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1972
1973 static int acpi_bus_scan_fixed(void)
1974 {
1975         int result = 0;
1976
1977         /*
1978          * Enumerate all fixed-feature devices.
1979          */
1980         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1981                 struct acpi_device *device = NULL;
1982
1983                 result = acpi_add_single_object(&device, NULL,
1984                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1985                                                 ACPI_STA_DEFAULT);
1986                 if (result)
1987                         return result;
1988
1989                 device->flags.match_driver = true;
1990                 result = device_attach(&device->dev);
1991                 if (result < 0)
1992                         return result;
1993
1994                 device_init_wakeup(&device->dev, true);
1995         }
1996
1997         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1998                 struct acpi_device *device = NULL;
1999
2000                 result = acpi_add_single_object(&device, NULL,
2001                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2002                                                 ACPI_STA_DEFAULT);
2003                 if (result)
2004                         return result;
2005
2006                 device->flags.match_driver = true;
2007                 result = device_attach(&device->dev);
2008         }
2009
2010         return result < 0 ? result : 0;
2011 }
2012
2013 static void __init acpi_get_spcr_uart_addr(void)
2014 {
2015         acpi_status status;
2016         struct acpi_table_spcr *spcr_ptr;
2017
2018         status = acpi_get_table(ACPI_SIG_SPCR, 0,
2019                                 (struct acpi_table_header **)&spcr_ptr);
2020         if (ACPI_SUCCESS(status))
2021                 spcr_uart_addr = spcr_ptr->serial_port.address;
2022         else
2023                 printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
2024 }
2025
2026 static bool acpi_scan_initialized;
2027
2028 int __init acpi_scan_init(void)
2029 {
2030         int result;
2031         acpi_status status;
2032         struct acpi_table_stao *stao_ptr;
2033
2034         acpi_pci_root_init();
2035         acpi_pci_link_init();
2036         acpi_processor_init();
2037         acpi_lpss_init();
2038         acpi_apd_init();
2039         acpi_cmos_rtc_init();
2040         acpi_container_init();
2041         acpi_memory_hotplug_init();
2042         acpi_pnp_init();
2043         acpi_int340x_thermal_init();
2044         acpi_amba_init();
2045         acpi_watchdog_init();
2046
2047         acpi_scan_add_handler(&generic_device_handler);
2048
2049         /*
2050          * If there is STAO table, check whether it needs to ignore the UART
2051          * device in SPCR table.
2052          */
2053         status = acpi_get_table(ACPI_SIG_STAO, 0,
2054                                 (struct acpi_table_header **)&stao_ptr);
2055         if (ACPI_SUCCESS(status)) {
2056                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2057                         printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
2058
2059                 if (stao_ptr->ignore_uart)
2060                         acpi_get_spcr_uart_addr();
2061         }
2062
2063         mutex_lock(&acpi_scan_lock);
2064         /*
2065          * Enumerate devices in the ACPI namespace.
2066          */
2067         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2068         if (result)
2069                 goto out;
2070
2071         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2072         if (result)
2073                 goto out;
2074
2075         /* Fixed feature devices do not exist on HW-reduced platform */
2076         if (!acpi_gbl_reduced_hardware) {
2077                 result = acpi_bus_scan_fixed();
2078                 if (result) {
2079                         acpi_detach_data(acpi_root->handle,
2080                                          acpi_scan_drop_device);
2081                         acpi_device_del(acpi_root);
2082                         put_device(&acpi_root->dev);
2083                         goto out;
2084                 }
2085         }
2086
2087         acpi_gpe_apply_masked_gpes();
2088         acpi_update_all_gpes();
2089         acpi_ec_ecdt_start();
2090
2091         acpi_scan_initialized = true;
2092
2093  out:
2094         mutex_unlock(&acpi_scan_lock);
2095         return result;
2096 }
2097
2098 static struct acpi_probe_entry *ape;
2099 static int acpi_probe_count;
2100 static DEFINE_MUTEX(acpi_probe_mutex);
2101
2102 static int __init acpi_match_madt(struct acpi_subtable_header *header,
2103                                   const unsigned long end)
2104 {
2105         if (!ape->subtable_valid || ape->subtable_valid(header, ape))
2106                 if (!ape->probe_subtbl(header, end))
2107                         acpi_probe_count++;
2108
2109         return 0;
2110 }
2111
2112 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2113 {
2114         int count = 0;
2115
2116         if (acpi_disabled)
2117                 return 0;
2118
2119         mutex_lock(&acpi_probe_mutex);
2120         for (ape = ap_head; nr; ape++, nr--) {
2121                 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
2122                         acpi_probe_count = 0;
2123                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2124                         count += acpi_probe_count;
2125                 } else {
2126                         int res;
2127                         res = acpi_table_parse(ape->id, ape->probe_table);
2128                         if (!res)
2129                                 count++;
2130                 }
2131         }
2132         mutex_unlock(&acpi_probe_mutex);
2133
2134         return count;
2135 }
2136
2137 struct acpi_table_events_work {
2138         struct work_struct work;
2139         void *table;
2140         u32 event;
2141 };
2142
2143 static void acpi_table_events_fn(struct work_struct *work)
2144 {
2145         struct acpi_table_events_work *tew;
2146
2147         tew = container_of(work, struct acpi_table_events_work, work);
2148
2149         if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2150                 acpi_scan_lock_acquire();
2151                 acpi_bus_scan(ACPI_ROOT_OBJECT);
2152                 acpi_scan_lock_release();
2153         }
2154
2155         kfree(tew);
2156 }
2157
2158 void acpi_scan_table_handler(u32 event, void *table, void *context)
2159 {
2160         struct acpi_table_events_work *tew;
2161
2162         if (!acpi_scan_initialized)
2163                 return;
2164
2165         if (event != ACPI_TABLE_EVENT_LOAD)
2166                 return;
2167
2168         tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2169         if (!tew)
2170                 return;
2171
2172         INIT_WORK(&tew->work, acpi_table_events_fn);
2173         tew->table = table;
2174         tew->event = event;
2175
2176         schedule_work(&tew->work);
2177 }
2178
2179 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2180 {
2181         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2182 }
2183 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2184
2185 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2186 {
2187         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2188 }
2189 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);