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