drivers/acpi/scan.c

   1 /*
   2  * scan.c - support for transforming the ACPI namespace into individual objects
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/init.h>
   7 #include <linux/slab.h>
   8 #include <linux/kernel.h>
   9 #include <linux/acpi.h>
  10 #include <linux/acpi_iort.h>
  11 #include <linux/signal.h>
  12 #include <linux/kthread.h>
  13 #include <linux/dmi.h>
  14 #include <linux/nls.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/platform_data/x86/apple.h>
  17
  18 #include <asm/pgtable.h>
  19
  20 #include "internal.h"
  21
  22 #define _COMPONENT              ACPI_BUS_COMPONENT
  23 ACPI_MODULE_NAME("scan");
  24 extern struct acpi_device *acpi_root;
  25
  26 #define ACPI_BUS_CLASS                  "system_bus"
  27 #define ACPI_BUS_HID                    "LNXSYBUS"
  28 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  29
  30 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  31
  32 #define INVALID_ACPI_HANDLE     ((acpi_handle)empty_zero_page)
  33
  34 static const char *dummy_hid = "device";
  35
  36 static LIST_HEAD(acpi_dep_list);
  37 static DEFINE_MUTEX(acpi_dep_list_lock);
  38 LIST_HEAD(acpi_bus_id_list);
  39 static DEFINE_MUTEX(acpi_scan_lock);
  40 static LIST_HEAD(acpi_scan_handlers_list);
  41 DEFINE_MUTEX(acpi_device_lock);
  42 LIST_HEAD(acpi_wakeup_device_list);
  43 static DEFINE_MUTEX(acpi_hp_context_lock);
  44
  45 /*
  46  * The UART device described by the SPCR table is the only object which needs
  47  * special-casing. Everything else is covered by ACPI namespace paths in STAO
  48  * table.
  49  */
  50 static u64 spcr_uart_addr;
  51
  52 struct acpi_dep_data {
  53         struct list_head node;
  54         acpi_handle master;
  55         acpi_handle slave;
  56 };
  57
  58 void acpi_scan_lock_acquire(void)
  59 {
  60         mutex_lock(&acpi_scan_lock);
  61 }
  62 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  63
  64 void acpi_scan_lock_release(void)
  65 {
  66         mutex_unlock(&acpi_scan_lock);
  67 }
  68 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  69
  70 void acpi_lock_hp_context(void)
  71 {
  72         mutex_lock(&acpi_hp_context_lock);
  73 }
  74
  75 void acpi_unlock_hp_context(void)
  76 {
  77         mutex_unlock(&acpi_hp_context_lock);
  78 }
  79
  80 void acpi_initialize_hp_context(struct acpi_device *adev,
  81                                 struct acpi_hotplug_context *hp,
  82                                 int (*notify)(struct acpi_device *, u32),
  83                                 void (*uevent)(struct acpi_device *, u32))
  84 {
  85         acpi_lock_hp_context();
  86         hp->notify = notify;
  87         hp->uevent = uevent;
  88         acpi_set_hp_context(adev, hp);
  89         acpi_unlock_hp_context();
  90 }
  91 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
  92
  93 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  94 {
  95         if (!handler)
  96                 return -EINVAL;
  97
  98         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  99         return 0;
 100 }
 101
 102 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
 103                                        const char *hotplug_profile_name)
 104 {
 105         int error;
 106
 107         error = acpi_scan_add_handler(handler);
 108         if (error)
 109                 return error;
 110
 111         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
 112         return 0;
 113 }
 114
 115 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 116 {
 117         struct acpi_device_physical_node *pn;
 118         bool offline = true;
 119         char *envp[] = { "EVENT=offline", NULL };
 120
 121         /*
 122          * acpi_container_offline() calls this for all of the container's
 123          * children under the container's physical_node_lock lock.
 124          */
 125         mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
 126
 127         list_for_each_entry(pn, &adev->physical_node_list, node)
 128                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
 129                         if (uevent)
 130                                 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
 131
 132                         offline = false;
 133                         break;
 134                 }
 135
 136         mutex_unlock(&adev->physical_node_lock);
 137         return offline;
 138 }
 139
 140 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 141                                     void **ret_p)
 142 {
 143         struct acpi_device *device = NULL;
 144         struct acpi_device_physical_node *pn;
 145         bool second_pass = (bool)data;
 146         acpi_status status = AE_OK;
 147
 148         if (acpi_bus_get_device(handle, &device))
 149                 return AE_OK;
 150
 151         if (device->handler && !device->handler->hotplug.enabled) {
 152                 *ret_p = &device->dev;
 153                 return AE_SUPPORT;
 154         }
 155
 156         mutex_lock(&device->physical_node_lock);
 157
 158         list_for_each_entry(pn, &device->physical_node_list, node) {
 159                 int ret;
 160
 161                 if (second_pass) {
 162                         /* Skip devices offlined by the first pass. */
 163                         if (pn->put_online)
 164                                 continue;
 165                 } else {
 166                         pn->put_online = false;
 167                 }
 168                 ret = device_offline(pn->dev);
 169                 if (ret >= 0) {
 170                         pn->put_online = !ret;
 171                 } else {
 172                         *ret_p = pn->dev;
 173                         if (second_pass) {
 174                                 status = AE_ERROR;
 175                                 break;
 176                         }
 177                 }
 178         }
 179
 180         mutex_unlock(&device->physical_node_lock);
 181
 182         return status;
 183 }
 184
 185 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 186                                    void **ret_p)
 187 {
 188         struct acpi_device *device = NULL;
 189         struct acpi_device_physical_node *pn;
 190
 191         if (acpi_bus_get_device(handle, &device))
 192                 return AE_OK;
 193
 194         mutex_lock(&device->physical_node_lock);
 195
 196         list_for_each_entry(pn, &device->physical_node_list, node)
 197                 if (pn->put_online) {
 198                         device_online(pn->dev);
 199                         pn->put_online = false;
 200                 }
 201
 202         mutex_unlock(&device->physical_node_lock);
 203
 204         return AE_OK;
 205 }
 206
 207 static int acpi_scan_try_to_offline(struct acpi_device *device)
 208 {
 209         acpi_handle handle = device->handle;
 210         struct device *errdev = NULL;
 211         acpi_status status;
 212
 213         /*
 214          * Carry out two passes here and ignore errors in the first pass,
 215          * because if the devices in question are memory blocks and
 216          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 217          * that the other blocks depend on, but it is not known in advance which
 218          * block holds them.
 219          *
 220          * If the first pass is successful, the second one isn't needed, though.
 221          */
 222         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 223                                      NULL, acpi_bus_offline, (void *)false,
 224                                      (void **)&errdev);
 225         if (status == AE_SUPPORT) {
 226                 dev_warn(errdev, "Offline disabled.\n");
 227                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 228                                     acpi_bus_online, NULL, NULL, NULL);
 229                 return -EPERM;
 230         }
 231         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
 232         if (errdev) {
 233                 errdev = NULL;
 234                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 235                                     NULL, acpi_bus_offline, (void *)true,
 236                                     (void **)&errdev);
 237                 if (!errdev)
 238                         acpi_bus_offline(handle, 0, (void *)true,
 239                                          (void **)&errdev);
 240
 241                 if (errdev) {
 242                         dev_warn(errdev, "Offline failed.\n");
 243                         acpi_bus_online(handle, 0, NULL, NULL);
 244                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 245                                             ACPI_UINT32_MAX, acpi_bus_online,
 246                                             NULL, NULL, NULL);
 247                         return -EBUSY;
 248                 }
 249         }
 250         return 0;
 251 }
 252
 253 static int acpi_scan_hot_remove(struct acpi_device *device)
 254 {
 255         acpi_handle handle = device->handle;
 256         unsigned long long sta;
 257         acpi_status status;
 258
 259         if (device->handler && device->handler->hotplug.demand_offline) {
 260                 if (!acpi_scan_is_offline(device, true))
 261                         return -EBUSY;
 262         } else {
 263                 int error = acpi_scan_try_to_offline(device);
 264                 if (error)
 265                         return error;
 266         }
 267
 268         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 269                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 270
 271         acpi_bus_trim(device);
 272
 273         acpi_evaluate_lck(handle, 0);
 274         /*
 275          * TBD: _EJD support.
 276          */
 277         status = acpi_evaluate_ej0(handle);
 278         if (status == AE_NOT_FOUND)
 279                 return -ENODEV;
 280         else if (ACPI_FAILURE(status))
 281                 return -EIO;
 282
 283         /*
 284          * Verify if eject was indeed successful.  If not, log an error
 285          * message.  No need to call _OST since _EJ0 call was made OK.
 286          */
 287         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 288         if (ACPI_FAILURE(status)) {
 289                 acpi_handle_warn(handle,
 290                         "Status check after eject failed (0x%x)\n", status);
 291         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 292                 acpi_handle_warn(handle,
 293                         "Eject incomplete - status 0x%llx\n", sta);
 294         }
 295
 296         return 0;
 297 }
 298
 299 static int acpi_scan_device_not_present(struct acpi_device *adev)
 300 {
 301         if (!acpi_device_enumerated(adev)) {
 302                 dev_warn(&adev->dev, "Still not present\n");
 303                 return -EALREADY;
 304         }
 305         acpi_bus_trim(adev);
 306         return 0;
 307 }
 308
 309 static int acpi_scan_device_check(struct acpi_device *adev)
 310 {
 311         int error;
 312
 313         acpi_bus_get_status(adev);
 314         if (adev->status.present || adev->status.functional) {
 315                 /*
 316                  * This function is only called for device objects for which
 317                  * matching scan handlers exist.  The only situation in which
 318                  * the scan handler is not attached to this device object yet
 319                  * is when the device has just appeared (either it wasn't
 320                  * present at all before or it was removed and then added
 321                  * again).
 322                  */
 323                 if (adev->handler) {
 324                         dev_warn(&adev->dev, "Already enumerated\n");
 325                         return -EALREADY;
 326                 }
 327                 error = acpi_bus_scan(adev->handle);
 328                 if (error) {
 329                         dev_warn(&adev->dev, "Namespace scan failure\n");
 330                         return error;
 331                 }
 332                 if (!adev->handler) {
 333                         dev_warn(&adev->dev, "Enumeration failure\n");
 334                         error = -ENODEV;
 335                 }
 336         } else {
 337                 error = acpi_scan_device_not_present(adev);
 338         }
 339         return error;
 340 }
 341
 342 static int acpi_scan_bus_check(struct acpi_device *adev)
 343 {
 344         struct acpi_scan_handler *handler = adev->handler;
 345         struct acpi_device *child;
 346         int error;
 347
 348         acpi_bus_get_status(adev);
 349         if (!(adev->status.present || adev->status.functional)) {
 350                 acpi_scan_device_not_present(adev);
 351                 return 0;
 352         }
 353         if (handler && handler->hotplug.scan_dependent)
 354                 return handler->hotplug.scan_dependent(adev);
 355
 356         error = acpi_bus_scan(adev->handle);
 357         if (error) {
 358                 dev_warn(&adev->dev, "Namespace scan failure\n");
 359                 return error;
 360         }
 361         list_for_each_entry(child, &adev->children, node) {
 362                 error = acpi_scan_bus_check(child);
 363                 if (error)
 364                         return error;
 365         }
 366         return 0;
 367 }
 368
 369 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 370 {
 371         switch (type) {
 372         case ACPI_NOTIFY_BUS_CHECK:
 373                 return acpi_scan_bus_check(adev);
 374         case ACPI_NOTIFY_DEVICE_CHECK:
 375                 return acpi_scan_device_check(adev);
 376         case ACPI_NOTIFY_EJECT_REQUEST:
 377         case ACPI_OST_EC_OSPM_EJECT:
 378                 if (adev->handler && !adev->handler->hotplug.enabled) {
 379                         dev_info(&adev->dev, "Eject disabled\n");
 380                         return -EPERM;
 381                 }
 382                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 383                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 384                 return acpi_scan_hot_remove(adev);
 385         }
 386         return -EINVAL;
 387 }
 388
 389 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 390 {
 391         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 392         int error = -ENODEV;
 393
 394         lock_device_hotplug();
 395         mutex_lock(&acpi_scan_lock);
 396
 397         /*
 398          * The device object's ACPI handle cannot become invalid as long as we
 399          * are holding acpi_scan_lock, but it might have become invalid before
 400          * that lock was acquired.
 401          */
 402         if (adev->handle == INVALID_ACPI_HANDLE)
 403                 goto err_out;
 404
 405         if (adev->flags.is_dock_station) {
 406                 error = dock_notify(adev, src);
 407         } else if (adev->flags.hotplug_notify) {
 408                 error = acpi_generic_hotplug_event(adev, src);
 409         } else {
 410                 int (*notify)(struct acpi_device *, u32);
 411
 412                 acpi_lock_hp_context();
 413                 notify = adev->hp ? adev->hp->notify : NULL;
 414                 acpi_unlock_hp_context();
 415                 /*
 416                  * There may be additional notify handlers for device objects
 417                  * without the .event() callback, so ignore them here.
 418                  */
 419                 if (notify)
 420                         error = notify(adev, src);
 421                 else
 422                         goto out;
 423         }
 424         switch (error) {
 425         case 0:
 426                 ost_code = ACPI_OST_SC_SUCCESS;
 427                 break;
 428         case -EPERM:
 429                 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 430                 break;
 431         case -EBUSY:
 432                 ost_code = ACPI_OST_SC_DEVICE_BUSY;
 433                 break;
 434         default:
 435                 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 436                 break;
 437         }
 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 bool 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
 859         wakeup->flags.notifier_present = 0;
 860
 861         /* Power button, Lid switch always enable wakeup */
 862         if (!acpi_match_device_ids(device, button_device_ids)) {
 863                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 864                         /* Do not use Lid/sleep button for S5 wakeup */
 865                         if (wakeup->sleep_state == ACPI_STATE_S5)
 866                                 wakeup->sleep_state = ACPI_STATE_S4;
 867                 }
 868                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 869                 device_set_wakeup_capable(&device->dev, true);
 870                 return true;
 871         }
 872
 873         status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 874                                          wakeup->gpe_number);
 875         return ACPI_SUCCESS(status);
 876 }
 877
 878 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 879 {
 880         int err;
 881
 882         /* Presence of _PRW indicates wake capable */
 883         if (!acpi_has_method(device->handle, "_PRW"))
 884                 return;
 885
 886         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
 887                                                            &device->wakeup);
 888         if (err) {
 889                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
 890                 return;
 891         }
 892
 893         device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
 894         device->wakeup.prepare_count = 0;
 895         /*
 896          * Call _PSW/_DSW object to disable its ability to wake the sleeping
 897          * system for the ACPI device with the _PRW object.
 898          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 899          * So it is necessary to call _DSW object first. Only when it is not
 900          * present will the _PSW object used.
 901          */
 902         err = acpi_device_sleep_wake(device, 0, 0, 0);
 903         if (err)
 904                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 905                                 "error in _DSW or _PSW evaluation\n"));
 906 }
 907
 908 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 909 {
 910         struct acpi_device_power_state *ps = &device->power.states[state];
 911         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 912         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 913         acpi_status status;
 914
 915         INIT_LIST_HEAD(&ps->resources);
 916
 917         /* Evaluate "_PRx" to get referenced power resources */
 918         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 919         if (ACPI_SUCCESS(status)) {
 920                 union acpi_object *package = buffer.pointer;
 921
 922                 if (buffer.length && package
 923                     && package->type == ACPI_TYPE_PACKAGE
 924                     && package->package.count) {
 925                         int err = acpi_extract_power_resources(package, 0,
 926                                                                &ps->resources);
 927                         if (!err)
 928                                 device->power.flags.power_resources = 1;
 929                 }
 930                 ACPI_FREE(buffer.pointer);
 931         }
 932
 933         /* Evaluate "_PSx" to see if we can do explicit sets */
 934         pathname[2] = 'S';
 935         if (acpi_has_method(device->handle, pathname))
 936                 ps->flags.explicit_set = 1;
 937
 938         /* State is valid if there are means to put the device into it. */
 939         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
 940                 ps->flags.valid = 1;
 941
 942         ps->power = -1;         /* Unknown - driver assigned */
 943         ps->latency = -1;       /* Unknown - driver assigned */
 944 }
 945
 946 static void acpi_bus_get_power_flags(struct acpi_device *device)
 947 {
 948         u32 i;
 949
 950         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 951         if (!acpi_has_method(device->handle, "_PS0") &&
 952             !acpi_has_method(device->handle, "_PR0"))
 953                 return;
 954
 955         device->flags.power_manageable = 1;
 956
 957         /*
 958          * Power Management Flags
 959          */
 960         if (acpi_has_method(device->handle, "_PSC"))
 961                 device->power.flags.explicit_get = 1;
 962
 963         if (acpi_has_method(device->handle, "_IRC"))
 964                 device->power.flags.inrush_current = 1;
 965
 966         if (acpi_has_method(device->handle, "_DSW"))
 967                 device->power.flags.dsw_present = 1;
 968
 969         /*
 970          * Enumerate supported power management states
 971          */
 972         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
 973                 acpi_bus_init_power_state(device, i);
 974
 975         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
 976         if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
 977                 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
 978
 979         /* Set defaults for D0 and D3hot states (always valid) */
 980         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 981         device->power.states[ACPI_STATE_D0].power = 100;
 982         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
 983
 984         if (acpi_bus_init_power(device))
 985                 device->flags.power_manageable = 0;
 986 }
 987
 988 static void acpi_bus_get_flags(struct acpi_device *device)
 989 {
 990         /* Presence of _STA indicates 'dynamic_status' */
 991         if (acpi_has_method(device->handle, "_STA"))
 992                 device->flags.dynamic_status = 1;
 993
 994         /* Presence of _RMV indicates 'removable' */
 995         if (acpi_has_method(device->handle, "_RMV"))
 996                 device->flags.removable = 1;
 997
 998         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 999         if (acpi_has_method(device->handle, "_EJD") ||
1000             acpi_has_method(device->handle, "_EJ0"))
1001                 device->flags.ejectable = 1;
1002 }
1003
1004 static void acpi_device_get_busid(struct acpi_device *device)
1005 {
1006         char bus_id[5] = { '?', 0 };
1007         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1008         int i = 0;
1009
1010         /*
1011          * Bus ID
1012          * ------
1013          * The device's Bus ID is simply the object name.
1014          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1015          */
1016         if (ACPI_IS_ROOT_DEVICE(device)) {
1017                 strcpy(device->pnp.bus_id, "ACPI");
1018                 return;
1019         }
1020
1021         switch (device->device_type) {
1022         case ACPI_BUS_TYPE_POWER_BUTTON:
1023                 strcpy(device->pnp.bus_id, "PWRF");
1024                 break;
1025         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1026                 strcpy(device->pnp.bus_id, "SLPF");
1027                 break;
1028         case ACPI_BUS_TYPE_ECDT_EC:
1029                 strcpy(device->pnp.bus_id, "ECDT");
1030                 break;
1031         default:
1032                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1033                 /* Clean up trailing underscores (if any) */
1034                 for (i = 3; i > 1; i--) {
1035                         if (bus_id[i] == '_')
1036                                 bus_id[i] = '\0';
1037                         else
1038                                 break;
1039                 }
1040                 strcpy(device->pnp.bus_id, bus_id);
1041                 break;
1042         }
1043 }
1044
1045 /*
1046  * acpi_ata_match - see if an acpi object is an ATA device
1047  *
1048  * If an acpi object has one of the ACPI ATA methods defined,
1049  * then we can safely call it an ATA device.
1050  */
1051 bool acpi_ata_match(acpi_handle handle)
1052 {
1053         return acpi_has_method(handle, "_GTF") ||
1054                acpi_has_method(handle, "_GTM") ||
1055                acpi_has_method(handle, "_STM") ||
1056                acpi_has_method(handle, "_SDD");
1057 }
1058
1059 /*
1060  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1061  *
1062  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1063  * then we can safely call it an ejectable drive bay
1064  */
1065 bool acpi_bay_match(acpi_handle handle)
1066 {
1067         acpi_handle phandle;
1068
1069         if (!acpi_has_method(handle, "_EJ0"))
1070                 return false;
1071         if (acpi_ata_match(handle))
1072                 return true;
1073         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1074                 return false;
1075
1076         return acpi_ata_match(phandle);
1077 }
1078
1079 bool acpi_device_is_battery(struct acpi_device *adev)
1080 {
1081         struct acpi_hardware_id *hwid;
1082
1083         list_for_each_entry(hwid, &adev->pnp.ids, list)
1084                 if (!strcmp("PNP0C0A", hwid->id))
1085                         return true;
1086
1087         return false;
1088 }
1089
1090 static bool is_ejectable_bay(struct acpi_device *adev)
1091 {
1092         acpi_handle handle = adev->handle;
1093
1094         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1095                 return true;
1096
1097         return acpi_bay_match(handle);
1098 }
1099
1100 /*
1101  * acpi_dock_match - see if an acpi object has a _DCK method
1102  */
1103 bool acpi_dock_match(acpi_handle handle)
1104 {
1105         return acpi_has_method(handle, "_DCK");
1106 }
1107
1108 static acpi_status
1109 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1110                           void **return_value)
1111 {
1112         long *cap = context;
1113
1114         if (acpi_has_method(handle, "_BCM") &&
1115             acpi_has_method(handle, "_BCL")) {
1116                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1117                                   "support\n"));
1118                 *cap |= ACPI_VIDEO_BACKLIGHT;
1119                 /* We have backlight support, no need to scan further */
1120                 return AE_CTRL_TERMINATE;
1121         }
1122         return 0;
1123 }
1124
1125 /* Returns true if the ACPI object is a video device which can be
1126  * handled by video.ko.
1127  * The device will get a Linux specific CID added in scan.c to
1128  * identify the device as an ACPI graphics device
1129  * Be aware that the graphics device may not be physically present
1130  * Use acpi_video_get_capabilities() to detect general ACPI video
1131  * capabilities of present cards
1132  */
1133 long acpi_is_video_device(acpi_handle handle)
1134 {
1135         long video_caps = 0;
1136
1137         /* Is this device able to support video switching ? */
1138         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1139                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1140
1141         /* Is this device able to retrieve a video ROM ? */
1142         if (acpi_has_method(handle, "_ROM"))
1143                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1144
1145         /* Is this device able to configure which video head to be POSTed ? */
1146         if (acpi_has_method(handle, "_VPO") &&
1147             acpi_has_method(handle, "_GPD") &&
1148             acpi_has_method(handle, "_SPD"))
1149                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1150
1151         /* Only check for backlight functionality if one of the above hit. */
1152         if (video_caps)
1153                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1154                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1155                                     &video_caps, NULL);
1156
1157         return video_caps;
1158 }
1159 EXPORT_SYMBOL(acpi_is_video_device);
1160
1161 const char *acpi_device_hid(struct acpi_device *device)
1162 {
1163         struct acpi_hardware_id *hid;
1164
1165         if (list_empty(&device->pnp.ids))
1166                 return dummy_hid;
1167
1168         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1169         return hid->id;
1170 }
1171 EXPORT_SYMBOL(acpi_device_hid);
1172
1173 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1174 {
1175         struct acpi_hardware_id *id;
1176
1177         id = kmalloc(sizeof(*id), GFP_KERNEL);
1178         if (!id)
1179                 return;
1180
1181         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1182         if (!id->id) {
1183                 kfree(id);
1184                 return;
1185         }
1186
1187         list_add_tail(&id->list, &pnp->ids);
1188         pnp->type.hardware_id = 1;
1189 }
1190
1191 /*
1192  * Old IBM workstations have a DSDT bug wherein the SMBus object
1193  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1194  * prefix.  Work around this.
1195  */
1196 static bool acpi_ibm_smbus_match(acpi_handle handle)
1197 {
1198         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1199         struct acpi_buffer path = { sizeof(node_name), node_name };
1200
1201         if (!dmi_name_in_vendors("IBM"))
1202                 return false;
1203
1204         /* Look for SMBS object */
1205         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1206             strcmp("SMBS", path.pointer))
1207                 return false;
1208
1209         /* Does it have the necessary (but misnamed) methods? */
1210         if (acpi_has_method(handle, "SBI") &&
1211             acpi_has_method(handle, "SBR") &&
1212             acpi_has_method(handle, "SBW"))
1213                 return true;
1214
1215         return false;
1216 }
1217
1218 static bool acpi_object_is_system_bus(acpi_handle handle)
1219 {
1220         acpi_handle tmp;
1221
1222         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1223             tmp == handle)
1224                 return true;
1225         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1226             tmp == handle)
1227                 return true;
1228
1229         return false;
1230 }
1231
1232 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1233                                 int device_type)
1234 {
1235         acpi_status status;
1236         struct acpi_device_info *info;
1237         struct acpi_pnp_device_id_list *cid_list;
1238         int i;
1239
1240         switch (device_type) {
1241         case ACPI_BUS_TYPE_DEVICE:
1242                 if (handle == ACPI_ROOT_OBJECT) {
1243                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1244                         break;
1245                 }
1246
1247                 status = acpi_get_object_info(handle, &info);
1248                 if (ACPI_FAILURE(status)) {
1249                         pr_err(PREFIX "%s: Error reading device info\n",
1250                                         __func__);
1251                         return;
1252                 }
1253
1254                 if (info->valid & ACPI_VALID_HID) {
1255                         acpi_add_id(pnp, info->hardware_id.string);
1256                         pnp->type.platform_id = 1;
1257                 }
1258                 if (info->valid & ACPI_VALID_CID) {
1259                         cid_list = &info->compatible_id_list;
1260                         for (i = 0; i < cid_list->count; i++)
1261                                 acpi_add_id(pnp, cid_list->ids[i].string);
1262                 }
1263                 if (info->valid & ACPI_VALID_ADR) {
1264                         pnp->bus_address = info->address;
1265                         pnp->type.bus_address = 1;
1266                 }
1267                 if (info->valid & ACPI_VALID_UID)
1268                         pnp->unique_id = kstrdup(info->unique_id.string,
1269                                                         GFP_KERNEL);
1270                 if (info->valid & ACPI_VALID_CLS)
1271                         acpi_add_id(pnp, info->class_code.string);
1272
1273                 kfree(info);
1274
1275                 /*
1276                  * Some devices don't reliably have _HIDs & _CIDs, so add
1277                  * synthetic HIDs to make sure drivers can find them.
1278                  */
1279                 if (acpi_is_video_device(handle))
1280                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1281                 else if (acpi_bay_match(handle))
1282                         acpi_add_id(pnp, ACPI_BAY_HID);
1283                 else if (acpi_dock_match(handle))
1284                         acpi_add_id(pnp, ACPI_DOCK_HID);
1285                 else if (acpi_ibm_smbus_match(handle))
1286                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1287                 else if (list_empty(&pnp->ids) &&
1288                          acpi_object_is_system_bus(handle)) {
1289                         /* \_SB, \_TZ, LNXSYBUS */
1290                         acpi_add_id(pnp, ACPI_BUS_HID);
1291                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1292                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1293                 }
1294
1295                 break;
1296         case ACPI_BUS_TYPE_POWER:
1297                 acpi_add_id(pnp, ACPI_POWER_HID);
1298                 break;
1299         case ACPI_BUS_TYPE_PROCESSOR:
1300                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1301                 break;
1302         case ACPI_BUS_TYPE_THERMAL:
1303                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1304                 break;
1305         case ACPI_BUS_TYPE_POWER_BUTTON:
1306                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1307                 break;
1308         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1309                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1310                 break;
1311         case ACPI_BUS_TYPE_ECDT_EC:
1312                 acpi_add_id(pnp, ACPI_ECDT_HID);
1313                 break;
1314         }
1315 }
1316
1317 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1318 {
1319         struct acpi_hardware_id *id, *tmp;
1320
1321         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1322                 kfree_const(id->id);
1323                 kfree(id);
1324         }
1325         kfree(pnp->unique_id);
1326 }
1327
1328 /**
1329  * acpi_dma_supported - Check DMA support for the specified device.
1330  * @adev: The pointer to acpi device
1331  *
1332  * Return false if DMA is not supported. Otherwise, return true
1333  */
1334 bool acpi_dma_supported(struct acpi_device *adev)
1335 {
1336         if (!adev)
1337                 return false;
1338
1339         if (adev->flags.cca_seen)
1340                 return true;
1341
1342         /*
1343         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1344         * DMA on "Intel platforms".  Presumably that includes all x86 and
1345         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1346         */
1347         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1348                 return true;
1349
1350         return false;
1351 }
1352
1353 /**
1354  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1355  * @adev: The pointer to acpi device
1356  *
1357  * Return enum dev_dma_attr.
1358  */
1359 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1360 {
1361         if (!acpi_dma_supported(adev))
1362                 return DEV_DMA_NOT_SUPPORTED;
1363
1364         if (adev->flags.coherent_dma)
1365                 return DEV_DMA_COHERENT;
1366         else
1367                 return DEV_DMA_NON_COHERENT;
1368 }
1369
1370 /**
1371  * acpi_dma_get_range() - Get device DMA parameters.
1372  *
1373  * @dev: device to configure
1374  * @dma_addr: pointer device DMA address result
1375  * @offset: pointer to the DMA offset result
1376  * @size: pointer to DMA range size result
1377  *
1378  * Evaluate DMA regions and return respectively DMA region start, offset
1379  * and size in dma_addr, offset and size on parsing success; it does not
1380  * update the passed in values on failure.
1381  *
1382  * Return 0 on success, < 0 on failure.
1383  */
1384 int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1385                        u64 *size)
1386 {
1387         struct acpi_device *adev;
1388         LIST_HEAD(list);
1389         struct resource_entry *rentry;
1390         int ret;
1391         struct device *dma_dev = dev;
1392         u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1393
1394         /*
1395          * Walk the device tree chasing an ACPI companion with a _DMA
1396          * object while we go. Stop if we find a device with an ACPI
1397          * companion containing a _DMA method.
1398          */
1399         do {
1400                 adev = ACPI_COMPANION(dma_dev);
1401                 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1402                         break;
1403
1404                 dma_dev = dma_dev->parent;
1405         } while (dma_dev);
1406
1407         if (!dma_dev)
1408                 return -ENODEV;
1409
1410         if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1411                 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1412                 return -EINVAL;
1413         }
1414
1415         ret = acpi_dev_get_dma_resources(adev, &list);
1416         if (ret > 0) {
1417                 list_for_each_entry(rentry, &list, node) {
1418                         if (dma_offset && rentry->offset != dma_offset) {
1419                                 ret = -EINVAL;
1420                                 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1421                                 goto out;
1422                         }
1423                         dma_offset = rentry->offset;
1424
1425                         /* Take lower and upper limits */
1426                         if (rentry->res->start < dma_start)
1427                                 dma_start = rentry->res->start;
1428                         if (rentry->res->end > dma_end)
1429                                 dma_end = rentry->res->end;
1430                 }
1431
1432                 if (dma_start >= dma_end) {
1433                         ret = -EINVAL;
1434                         dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1435                         goto out;
1436                 }
1437
1438                 *dma_addr = dma_start - dma_offset;
1439                 len = dma_end - dma_start;
1440                 *size = max(len, len + 1);
1441                 *offset = dma_offset;
1442         }
1443  out:
1444         acpi_dev_free_resource_list(&list);
1445
1446         return ret >= 0 ? 0 : ret;
1447 }
1448
1449 /**
1450  * acpi_dma_configure - Set-up DMA configuration for the device.
1451  * @dev: The pointer to the device
1452  * @attr: device dma attributes
1453  */
1454 int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
1455 {
1456         const struct iommu_ops *iommu;
1457         u64 dma_addr = 0, size = 0;
1458
1459         if (attr == DEV_DMA_NOT_SUPPORTED) {
1460                 set_dma_ops(dev, &dma_dummy_ops);
1461                 return 0;
1462         }
1463
1464         iort_dma_setup(dev, &dma_addr, &size);
1465
1466         iommu = iort_iommu_configure(dev);
1467         if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
1468                 return -EPROBE_DEFER;
1469
1470         arch_setup_dma_ops(dev, dma_addr, size,
1471                                 iommu, attr == DEV_DMA_COHERENT);
1472
1473         return 0;
1474 }
1475 EXPORT_SYMBOL_GPL(acpi_dma_configure);
1476
1477 static void acpi_init_coherency(struct acpi_device *adev)
1478 {
1479         unsigned long long cca = 0;
1480         acpi_status status;
1481         struct acpi_device *parent = adev->parent;
1482
1483         if (parent && parent->flags.cca_seen) {
1484                 /*
1485                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1486                  * already saw one.
1487                  */
1488                 adev->flags.cca_seen = 1;
1489                 cca = parent->flags.coherent_dma;
1490         } else {
1491                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1492                                                NULL, &cca);
1493                 if (ACPI_SUCCESS(status))
1494                         adev->flags.cca_seen = 1;
1495                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1496                         /*
1497                          * If architecture does not specify that _CCA is
1498                          * required for DMA-able devices (e.g. x86),
1499                          * we default to _CCA=1.
1500                          */
1501                         cca = 1;
1502                 else
1503                         acpi_handle_debug(adev->handle,
1504                                           "ACPI device is missing _CCA.\n");
1505         }
1506
1507         adev->flags.coherent_dma = cca;
1508 }
1509
1510 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1511 {
1512         bool *is_serial_bus_slave_p = data;
1513
1514         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1515                 return 1;
1516
1517         *is_serial_bus_slave_p = true;
1518
1519          /* no need to do more checking */
1520         return -1;
1521 }
1522
1523 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1524 {
1525         struct acpi_device *parent = device->parent;
1526         static const struct acpi_device_id indirect_io_hosts[] = {
1527                 {"HISI0191", 0},
1528                 {}
1529         };
1530
1531         return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1532 }
1533
1534 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1535 {
1536         struct list_head resource_list;
1537         bool is_serial_bus_slave = false;
1538         /*
1539          * These devices have multiple I2cSerialBus resources and an i2c-client
1540          * must be instantiated for each, each with its own i2c_device_id.
1541          * Normally we only instantiate an i2c-client for the first resource,
1542          * using the ACPI HID as id. These special cases are handled by the
1543          * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
1544          * which i2c_device_id to use for each resource.
1545          */
1546         static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
1547                 {"BSG1160", },
1548                 {"BSG2150", },
1549                 {"INT33FE", },
1550                 {"INT3515", },
1551                 {}
1552         };
1553
1554         if (acpi_is_indirect_io_slave(device))
1555                 return true;
1556
1557         /* Macs use device properties in lieu of _CRS resources */
1558         if (x86_apple_machine &&
1559             (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1560              fwnode_property_present(&device->fwnode, "i2cAddress") ||
1561              fwnode_property_present(&device->fwnode, "baud")))
1562                 return true;
1563
1564         /* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */
1565         if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
1566                 return false;
1567
1568         INIT_LIST_HEAD(&resource_list);
1569         acpi_dev_get_resources(device, &resource_list,
1570                                acpi_check_serial_bus_slave,
1571                                &is_serial_bus_slave);
1572         acpi_dev_free_resource_list(&resource_list);
1573
1574         return is_serial_bus_slave;
1575 }
1576
1577 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1578                              int type, unsigned long long sta)
1579 {
1580         INIT_LIST_HEAD(&device->pnp.ids);
1581         device->device_type = type;
1582         device->handle = handle;
1583         device->parent = acpi_bus_get_parent(handle);
1584         device->fwnode.ops = &acpi_device_fwnode_ops;
1585         acpi_set_device_status(device, sta);
1586         acpi_device_get_busid(device);
1587         acpi_set_pnp_ids(handle, &device->pnp, type);
1588         acpi_init_properties(device);
1589         acpi_bus_get_flags(device);
1590         device->flags.match_driver = false;
1591         device->flags.initialized = true;
1592         device->flags.enumeration_by_parent =
1593                 acpi_device_enumeration_by_parent(device);
1594         acpi_device_clear_enumerated(device);
1595         device_initialize(&device->dev);
1596         dev_set_uevent_suppress(&device->dev, true);
1597         acpi_init_coherency(device);
1598         /* Assume there are unmet deps until acpi_device_dep_initialize() runs */
1599         device->dep_unmet = 1;
1600 }
1601
1602 void acpi_device_add_finalize(struct acpi_device *device)
1603 {
1604         dev_set_uevent_suppress(&device->dev, false);
1605         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1606 }
1607
1608 static int acpi_add_single_object(struct acpi_device **child,
1609                                   acpi_handle handle, int type,
1610                                   unsigned long long sta)
1611 {
1612         int result;
1613         struct acpi_device *device;
1614         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1615
1616         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1617         if (!device) {
1618                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1619                 return -ENOMEM;
1620         }
1621
1622         acpi_init_device_object(device, handle, type, sta);
1623         /*
1624          * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so
1625          * that we can call acpi_bus_get_status() and use its quirk handling.
1626          * Note this must be done before the get power-/wakeup_dev-flags calls.
1627          */
1628         if (type == ACPI_BUS_TYPE_DEVICE)
1629                 if (acpi_bus_get_status(device) < 0)
1630                         acpi_set_device_status(device, 0);
1631
1632         acpi_bus_get_power_flags(device);
1633         acpi_bus_get_wakeup_device_flags(device);
1634
1635         result = acpi_device_add(device, acpi_device_release);
1636         if (result) {
1637                 acpi_device_release(&device->dev);
1638                 return result;
1639         }
1640
1641         acpi_power_add_remove_device(device, true);
1642         acpi_device_add_finalize(device);
1643         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1644         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1645                 dev_name(&device->dev), (char *) buffer.pointer,
1646                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1647         kfree(buffer.pointer);
1648         *child = device;
1649         return 0;
1650 }
1651
1652 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1653                                             void *context)
1654 {
1655         struct resource *res = context;
1656
1657         if (acpi_dev_resource_memory(ares, res))
1658                 return AE_CTRL_TERMINATE;
1659
1660         return AE_OK;
1661 }
1662
1663 static bool acpi_device_should_be_hidden(acpi_handle handle)
1664 {
1665         acpi_status status;
1666         struct resource res;
1667
1668         /* Check if it should ignore the UART device */
1669         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1670                 return false;
1671
1672         /*
1673          * The UART device described in SPCR table is assumed to have only one
1674          * memory resource present. So we only look for the first one here.
1675          */
1676         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1677                                      acpi_get_resource_memory, &res);
1678         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1679                 return false;
1680
1681         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1682                          &res.start);
1683
1684         return true;
1685 }
1686
1687 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1688                                     unsigned long long *sta)
1689 {
1690         acpi_status status;
1691         acpi_object_type acpi_type;
1692
1693         status = acpi_get_type(handle, &acpi_type);
1694         if (ACPI_FAILURE(status))
1695                 return -ENODEV;
1696
1697         switch (acpi_type) {
1698         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1699         case ACPI_TYPE_DEVICE:
1700                 if (acpi_device_should_be_hidden(handle))
1701                         return -ENODEV;
1702
1703                 *type = ACPI_BUS_TYPE_DEVICE;
1704                 /*
1705                  * acpi_add_single_object updates this once we've an acpi_device
1706                  * so that acpi_bus_get_status' quirk handling can be used.
1707                  */
1708                 *sta = ACPI_STA_DEFAULT;
1709                 break;
1710         case ACPI_TYPE_PROCESSOR:
1711                 *type = ACPI_BUS_TYPE_PROCESSOR;
1712                 status = acpi_bus_get_status_handle(handle, sta);
1713                 if (ACPI_FAILURE(status))
1714                         return -ENODEV;
1715                 break;
1716         case ACPI_TYPE_THERMAL:
1717                 *type = ACPI_BUS_TYPE_THERMAL;
1718                 *sta = ACPI_STA_DEFAULT;
1719                 break;
1720         case ACPI_TYPE_POWER:
1721                 *type = ACPI_BUS_TYPE_POWER;
1722                 *sta = ACPI_STA_DEFAULT;
1723                 break;
1724         default:
1725                 return -ENODEV;
1726         }
1727
1728         return 0;
1729 }
1730
1731 bool acpi_device_is_present(const struct acpi_device *adev)
1732 {
1733         return adev->status.present || adev->status.functional;
1734 }
1735
1736 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1737                                        const char *idstr,
1738                                        const struct acpi_device_id **matchid)
1739 {
1740         const struct acpi_device_id *devid;
1741
1742         if (handler->match)
1743                 return handler->match(idstr, matchid);
1744
1745         for (devid = handler->ids; devid->id[0]; devid++)
1746                 if (!strcmp((char *)devid->id, idstr)) {
1747                         if (matchid)
1748                                 *matchid = devid;
1749
1750                         return true;
1751                 }
1752
1753         return false;
1754 }
1755
1756 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1757                                         const struct acpi_device_id **matchid)
1758 {
1759         struct acpi_scan_handler *handler;
1760
1761         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1762                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1763                         return handler;
1764
1765         return NULL;
1766 }
1767
1768 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1769 {
1770         if (!!hotplug->enabled == !!val)
1771                 return;
1772
1773         mutex_lock(&acpi_scan_lock);
1774
1775         hotplug->enabled = val;
1776
1777         mutex_unlock(&acpi_scan_lock);
1778 }
1779
1780 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1781 {
1782         struct acpi_hardware_id *hwid;
1783
1784         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1785                 acpi_dock_add(adev);
1786                 return;
1787         }
1788         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1789                 struct acpi_scan_handler *handler;
1790
1791                 handler = acpi_scan_match_handler(hwid->id, NULL);
1792                 if (handler) {
1793                         adev->flags.hotplug_notify = true;
1794                         break;
1795                 }
1796         }
1797 }
1798
1799 static void acpi_device_dep_initialize(struct acpi_device *adev)
1800 {
1801         struct acpi_dep_data *dep;
1802         struct acpi_handle_list dep_devices;
1803         acpi_status status;
1804         int i;
1805
1806         adev->dep_unmet = 0;
1807
1808         if (!acpi_has_method(adev->handle, "_DEP"))
1809                 return;
1810
1811         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1812                                         &dep_devices);
1813         if (ACPI_FAILURE(status)) {
1814                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1815                 return;
1816         }
1817
1818         for (i = 0; i < dep_devices.count; i++) {
1819                 struct acpi_device_info *info;
1820                 int skip;
1821
1822                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1823                 if (ACPI_FAILURE(status)) {
1824                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1825                         continue;
1826                 }
1827
1828                 /*
1829                  * Skip the dependency of Windows System Power
1830                  * Management Controller
1831                  */
1832                 skip = info->valid & ACPI_VALID_HID &&
1833                         !strcmp(info->hardware_id.string, "INT3396");
1834
1835                 kfree(info);
1836
1837                 if (skip)
1838                         continue;
1839
1840                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1841                 if (!dep)
1842                         return;
1843
1844                 dep->master = dep_devices.handles[i];
1845                 dep->slave  = adev->handle;
1846                 adev->dep_unmet++;
1847
1848                 mutex_lock(&acpi_dep_list_lock);
1849                 list_add_tail(&dep->node , &acpi_dep_list);
1850                 mutex_unlock(&acpi_dep_list_lock);
1851         }
1852 }
1853
1854 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1855                                       void *not_used, void **return_value)
1856 {
1857         struct acpi_device *device = NULL;
1858         int type;
1859         unsigned long long sta;
1860         int result;
1861
1862         acpi_bus_get_device(handle, &device);
1863         if (device)
1864                 goto out;
1865
1866         result = acpi_bus_type_and_status(handle, &type, &sta);
1867         if (result)
1868                 return AE_OK;
1869
1870         if (type == ACPI_BUS_TYPE_POWER) {
1871                 acpi_add_power_resource(handle);
1872                 return AE_OK;
1873         }
1874
1875         acpi_add_single_object(&device, handle, type, sta);
1876         if (!device)
1877                 return AE_CTRL_DEPTH;
1878
1879         acpi_scan_init_hotplug(device);
1880         acpi_device_dep_initialize(device);
1881
1882  out:
1883         if (!*return_value)
1884                 *return_value = device;
1885
1886         return AE_OK;
1887 }
1888
1889 static void acpi_default_enumeration(struct acpi_device *device)
1890 {
1891         /*
1892          * Do not enumerate devices with enumeration_by_parent flag set as
1893          * they will be enumerated by their respective parents.
1894          */
1895         if (!device->flags.enumeration_by_parent) {
1896                 acpi_create_platform_device(device, NULL);
1897                 acpi_device_set_enumerated(device);
1898         } else {
1899                 blocking_notifier_call_chain(&acpi_reconfig_chain,
1900                                              ACPI_RECONFIG_DEVICE_ADD, device);
1901         }
1902 }
1903
1904 static const struct acpi_device_id generic_device_ids[] = {
1905         {ACPI_DT_NAMESPACE_HID, },
1906         {"", },
1907 };
1908
1909 static int acpi_generic_device_attach(struct acpi_device *adev,
1910                                       const struct acpi_device_id *not_used)
1911 {
1912         /*
1913          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1914          * below can be unconditional.
1915          */
1916         if (adev->data.of_compatible)
1917                 acpi_default_enumeration(adev);
1918
1919         return 1;
1920 }
1921
1922 static struct acpi_scan_handler generic_device_handler = {
1923         .ids = generic_device_ids,
1924         .attach = acpi_generic_device_attach,
1925 };
1926
1927 static int acpi_scan_attach_handler(struct acpi_device *device)
1928 {
1929         struct acpi_hardware_id *hwid;
1930         int ret = 0;
1931
1932         list_for_each_entry(hwid, &device->pnp.ids, list) {
1933                 const struct acpi_device_id *devid;
1934                 struct acpi_scan_handler *handler;
1935
1936                 handler = acpi_scan_match_handler(hwid->id, &devid);
1937                 if (handler) {
1938                         if (!handler->attach) {
1939                                 device->pnp.type.platform_id = 0;
1940                                 continue;
1941                         }
1942                         device->handler = handler;
1943                         ret = handler->attach(device, devid);
1944                         if (ret > 0)
1945                                 break;
1946
1947                         device->handler = NULL;
1948                         if (ret < 0)
1949                                 break;
1950                 }
1951         }
1952
1953         return ret;
1954 }
1955
1956 static void acpi_bus_attach(struct acpi_device *device)
1957 {
1958         struct acpi_device *child;
1959         acpi_handle ejd;
1960         int ret;
1961
1962         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1963                 register_dock_dependent_device(device, ejd);
1964
1965         acpi_bus_get_status(device);
1966         /* Skip devices that are not present. */
1967         if (!acpi_device_is_present(device)) {
1968                 device->flags.initialized = false;
1969                 acpi_device_clear_enumerated(device);
1970                 device->flags.power_manageable = 0;
1971                 return;
1972         }
1973         if (device->handler)
1974                 goto ok;
1975
1976         if (!device->flags.initialized) {
1977                 device->flags.power_manageable =
1978                         device->power.states[ACPI_STATE_D0].flags.valid;
1979                 if (acpi_bus_init_power(device))
1980                         device->flags.power_manageable = 0;
1981
1982                 device->flags.initialized = true;
1983         } else if (device->flags.visited) {
1984                 goto ok;
1985         }
1986
1987         ret = acpi_scan_attach_handler(device);
1988         if (ret < 0)
1989                 return;
1990
1991         device->flags.match_driver = true;
1992         if (ret > 0 && !device->flags.enumeration_by_parent) {
1993                 acpi_device_set_enumerated(device);
1994                 goto ok;
1995         }
1996
1997         ret = device_attach(&device->dev);
1998         if (ret < 0)
1999                 return;
2000
2001         if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2002                 acpi_default_enumeration(device);
2003         else
2004                 acpi_device_set_enumerated(device);
2005
2006  ok:
2007         list_for_each_entry(child, &device->children, node)
2008                 acpi_bus_attach(child);
2009
2010         if (device->handler && device->handler->hotplug.notify_online)
2011                 device->handler->hotplug.notify_online(device);
2012 }
2013
2014 void acpi_walk_dep_device_list(acpi_handle handle)
2015 {
2016         struct acpi_dep_data *dep, *tmp;
2017         struct acpi_device *adev;
2018
2019         mutex_lock(&acpi_dep_list_lock);
2020         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2021                 if (dep->master == handle) {
2022                         acpi_bus_get_device(dep->slave, &adev);
2023                         if (!adev)
2024                                 continue;
2025
2026                         adev->dep_unmet--;
2027                         if (!adev->dep_unmet)
2028                                 acpi_bus_attach(adev);
2029                         list_del(&dep->node);
2030                         kfree(dep);
2031                 }
2032         }
2033         mutex_unlock(&acpi_dep_list_lock);
2034 }
2035 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2036
2037 /**
2038  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2039  * @handle: Root of the namespace scope to scan.
2040  *
2041  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2042  * found devices.
2043  *
2044  * If no devices were found, -ENODEV is returned, but it does not mean that
2045  * there has been a real error.  There just have been no suitable ACPI objects
2046  * in the table trunk from which the kernel could create a device and add an
2047  * appropriate driver.
2048  *
2049  * Must be called under acpi_scan_lock.
2050  */
2051 int acpi_bus_scan(acpi_handle handle)
2052 {
2053         void *device = NULL;
2054
2055         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2056                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2057                                     acpi_bus_check_add, NULL, NULL, &device);
2058
2059         if (device) {
2060                 acpi_bus_attach(device);
2061                 return 0;
2062         }
2063         return -ENODEV;
2064 }
2065 EXPORT_SYMBOL(acpi_bus_scan);
2066
2067 /**
2068  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2069  * @adev: Root of the ACPI namespace scope to walk.
2070  *
2071  * Must be called under acpi_scan_lock.
2072  */
2073 void acpi_bus_trim(struct acpi_device *adev)
2074 {
2075         struct acpi_scan_handler *handler = adev->handler;
2076         struct acpi_device *child;
2077
2078         list_for_each_entry_reverse(child, &adev->children, node)
2079                 acpi_bus_trim(child);
2080
2081         adev->flags.match_driver = false;
2082         if (handler) {
2083                 if (handler->detach)
2084                         handler->detach(adev);
2085
2086                 adev->handler = NULL;
2087         } else {
2088                 device_release_driver(&adev->dev);
2089         }
2090         /*
2091          * Most likely, the device is going away, so put it into D3cold before
2092          * that.
2093          */
2094         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2095         adev->flags.initialized = false;
2096         acpi_device_clear_enumerated(adev);
2097 }
2098 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2099
2100 int acpi_bus_register_early_device(int type)
2101 {
2102         struct acpi_device *device = NULL;
2103         int result;
2104
2105         result = acpi_add_single_object(&device, NULL,
2106                                         type, ACPI_STA_DEFAULT);
2107         if (result)
2108                 return result;
2109
2110         device->flags.match_driver = true;
2111         return device_attach(&device->dev);
2112 }
2113 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2114
2115 static int acpi_bus_scan_fixed(void)
2116 {
2117         int result = 0;
2118
2119         /*
2120          * Enumerate all fixed-feature devices.
2121          */
2122         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2123                 struct acpi_device *device = NULL;
2124
2125                 result = acpi_add_single_object(&device, NULL,
2126                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2127                                                 ACPI_STA_DEFAULT);
2128                 if (result)
2129                         return result;
2130
2131                 device->flags.match_driver = true;
2132                 result = device_attach(&device->dev);
2133                 if (result < 0)
2134                         return result;
2135
2136                 device_init_wakeup(&device->dev, true);
2137         }
2138
2139         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2140                 struct acpi_device *device = NULL;
2141
2142                 result = acpi_add_single_object(&device, NULL,
2143                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2144                                                 ACPI_STA_DEFAULT);
2145                 if (result)
2146                         return result;
2147
2148                 device->flags.match_driver = true;
2149                 result = device_attach(&device->dev);
2150         }
2151
2152         return result < 0 ? result : 0;
2153 }
2154
2155 static void __init acpi_get_spcr_uart_addr(void)
2156 {
2157         acpi_status status;
2158         struct acpi_table_spcr *spcr_ptr;
2159
2160         status = acpi_get_table(ACPI_SIG_SPCR, 0,
2161                                 (struct acpi_table_header **)&spcr_ptr);
2162         if (ACPI_SUCCESS(status))
2163                 spcr_uart_addr = spcr_ptr->serial_port.address;
2164         else
2165                 printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
2166 }
2167
2168 static bool acpi_scan_initialized;
2169
2170 int __init acpi_scan_init(void)
2171 {
2172         int result;
2173         acpi_status status;
2174         struct acpi_table_stao *stao_ptr;
2175
2176         acpi_pci_root_init();
2177         acpi_pci_link_init();
2178         acpi_processor_init();
2179         acpi_lpss_init();
2180         acpi_apd_init();
2181         acpi_cmos_rtc_init();
2182         acpi_container_init();
2183         acpi_memory_hotplug_init();
2184         acpi_watchdog_init();
2185         acpi_pnp_init();
2186         acpi_int340x_thermal_init();
2187         acpi_amba_init();
2188         acpi_init_lpit();
2189
2190         acpi_scan_add_handler(&generic_device_handler);
2191
2192         /*
2193          * If there is STAO table, check whether it needs to ignore the UART
2194          * device in SPCR table.
2195          */
2196         status = acpi_get_table(ACPI_SIG_STAO, 0,
2197                                 (struct acpi_table_header **)&stao_ptr);
2198         if (ACPI_SUCCESS(status)) {
2199                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2200                         printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
2201
2202                 if (stao_ptr->ignore_uart)
2203                         acpi_get_spcr_uart_addr();
2204         }
2205
2206         acpi_gpe_apply_masked_gpes();
2207         acpi_update_all_gpes();
2208
2209         mutex_lock(&acpi_scan_lock);
2210         /*
2211          * Enumerate devices in the ACPI namespace.
2212          */
2213         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2214         if (result)
2215                 goto out;
2216
2217         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2218         if (result)
2219                 goto out;
2220
2221         /* Fixed feature devices do not exist on HW-reduced platform */
2222         if (!acpi_gbl_reduced_hardware) {
2223                 result = acpi_bus_scan_fixed();
2224                 if (result) {
2225                         acpi_detach_data(acpi_root->handle,
2226                                          acpi_scan_drop_device);
2227                         acpi_device_del(acpi_root);
2228                         put_device(&acpi_root->dev);
2229                         goto out;
2230                 }
2231         }
2232
2233         acpi_scan_initialized = true;
2234
2235  out:
2236         mutex_unlock(&acpi_scan_lock);
2237         return result;
2238 }
2239
2240 static struct acpi_probe_entry *ape;
2241 static int acpi_probe_count;
2242 static DEFINE_MUTEX(acpi_probe_mutex);
2243
2244 static int __init acpi_match_madt(struct acpi_subtable_header *header,
2245                                   const unsigned long end)
2246 {
2247         if (!ape->subtable_valid || ape->subtable_valid(header, ape))
2248                 if (!ape->probe_subtbl(header, end))
2249                         acpi_probe_count++;
2250
2251         return 0;
2252 }
2253
2254 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2255 {
2256         int count = 0;
2257
2258         if (acpi_disabled)
2259                 return 0;
2260
2261         mutex_lock(&acpi_probe_mutex);
2262         for (ape = ap_head; nr; ape++, nr--) {
2263                 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
2264                         acpi_probe_count = 0;
2265                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2266                         count += acpi_probe_count;
2267                 } else {
2268                         int res;
2269                         res = acpi_table_parse(ape->id, ape->probe_table);
2270                         if (!res)
2271                                 count++;
2272                 }
2273         }
2274         mutex_unlock(&acpi_probe_mutex);
2275
2276         return count;
2277 }
2278
2279 struct acpi_table_events_work {
2280         struct work_struct work;
2281         void *table;
2282         u32 event;
2283 };
2284
2285 static void acpi_table_events_fn(struct work_struct *work)
2286 {
2287         struct acpi_table_events_work *tew;
2288
2289         tew = container_of(work, struct acpi_table_events_work, work);
2290
2291         if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2292                 acpi_scan_lock_acquire();
2293                 acpi_bus_scan(ACPI_ROOT_OBJECT);
2294                 acpi_scan_lock_release();
2295         }
2296
2297         kfree(tew);
2298 }
2299
2300 void acpi_scan_table_handler(u32 event, void *table, void *context)
2301 {
2302         struct acpi_table_events_work *tew;
2303
2304         if (!acpi_scan_initialized)
2305                 return;
2306
2307         if (event != ACPI_TABLE_EVENT_LOAD)
2308                 return;
2309
2310         tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2311         if (!tew)
2312                 return;
2313
2314         INIT_WORK(&tew->work, acpi_table_events_fn);
2315         tew->table = table;
2316         tew->event = event;
2317
2318         schedule_work(&tew->work);
2319 }
2320
2321 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2322 {
2323         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2324 }
2325 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2326
2327 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2328 {
2329         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2330 }
2331 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);