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