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                         ida_simple_remove(&acpi_device_bus_id->instance_ida, device->pnp.instance_no);
 486                         if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
 487                                 list_del(&acpi_device_bus_id->node);
 488                                 kfree_const(acpi_device_bus_id->bus_id);
 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         *device = NULL;
 589
 590         status = acpi_get_data_full(handle, acpi_scan_drop_device,
 591                                     (void **)device, callback);
 592         if (ACPI_FAILURE(status) || !*device) {
 593                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 594                                   handle));
 595                 return -ENODEV;
 596         }
 597         return 0;
 598 }
 599
 600 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 601 {
 602         return acpi_get_device_data(handle, device, NULL);
 603 }
 604 EXPORT_SYMBOL(acpi_bus_get_device);
 605
 606 static void get_acpi_device(void *dev)
 607 {
 608         if (dev)
 609                 get_device(&((struct acpi_device *)dev)->dev);
 610 }
 611
 612 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 613 {
 614         struct acpi_device *adev = NULL;
 615
 616         acpi_get_device_data(handle, &adev, get_acpi_device);
 617         return adev;
 618 }
 619
 620 void acpi_bus_put_acpi_device(struct acpi_device *adev)
 621 {
 622         put_device(&adev->dev);
 623 }
 624
 625 static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
 626 {
 627         struct acpi_device_bus_id *acpi_device_bus_id;
 628
 629         /* Find suitable bus_id and instance number in acpi_bus_id_list. */
 630         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 631                 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
 632                         return acpi_device_bus_id;
 633         }
 634         return NULL;
 635 }
 636
 637 static int acpi_device_set_name(struct acpi_device *device,
 638                                 struct acpi_device_bus_id *acpi_device_bus_id)
 639 {
 640         struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
 641         int result;
 642
 643         result = ida_simple_get(instance_ida, 0, ACPI_MAX_DEVICE_INSTANCES, GFP_KERNEL);
 644         if (result < 0)
 645                 return result;
 646
 647         device->pnp.instance_no = result;
 648         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
 649         return 0;
 650 }
 651
 652 int acpi_device_add(struct acpi_device *device,
 653                     void (*release)(struct device *))
 654 {
 655         struct acpi_device_bus_id *acpi_device_bus_id;
 656         int result;
 657
 658         if (device->handle) {
 659                 acpi_status status;
 660
 661                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
 662                                           device);
 663                 if (ACPI_FAILURE(status)) {
 664                         acpi_handle_err(device->handle,
 665                                         "Unable to attach device data\n");
 666                         return -ENODEV;
 667                 }
 668         }
 669
 670         /*
 671          * Linkage
 672          * -------
 673          * Link this device to its parent and siblings.
 674          */
 675         INIT_LIST_HEAD(&device->children);
 676         INIT_LIST_HEAD(&device->node);
 677         INIT_LIST_HEAD(&device->wakeup_list);
 678         INIT_LIST_HEAD(&device->physical_node_list);
 679         INIT_LIST_HEAD(&device->del_list);
 680         mutex_init(&device->physical_node_lock);
 681
 682         mutex_lock(&acpi_device_lock);
 683
 684         acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
 685         if (acpi_device_bus_id) {
 686                 result = acpi_device_set_name(device, acpi_device_bus_id);
 687                 if (result)
 688                         goto err_unlock;
 689         } else {
 690                 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
 691                                              GFP_KERNEL);
 692                 if (!acpi_device_bus_id) {
 693                         result = -ENOMEM;
 694                         goto err_unlock;
 695                 }
 696                 acpi_device_bus_id->bus_id =
 697                         kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
 698                 if (!acpi_device_bus_id->bus_id) {
 699                         kfree(acpi_device_bus_id);
 700                         result = -ENOMEM;
 701                         goto err_unlock;
 702                 }
 703
 704                 ida_init(&acpi_device_bus_id->instance_ida);
 705
 706                 result = acpi_device_set_name(device, acpi_device_bus_id);
 707                 if (result) {
 708                         kfree_const(acpi_device_bus_id->bus_id);
 709                         kfree(acpi_device_bus_id);
 710                         goto err_unlock;
 711                 }
 712
 713                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 714         }
 715
 716         if (device->parent)
 717                 list_add_tail(&device->node, &device->parent->children);
 718
 719         if (device->wakeup.flags.valid)
 720                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 721         mutex_unlock(&acpi_device_lock);
 722
 723         if (device->parent)
 724                 device->dev.parent = &device->parent->dev;
 725         device->dev.bus = &acpi_bus_type;
 726         device->dev.release = release;
 727         result = device_add(&device->dev);
 728         if (result) {
 729                 dev_err(&device->dev, "Error registering device\n");
 730                 goto err;
 731         }
 732
 733         result = acpi_device_setup_files(device);
 734         if (result)
 735                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 736                        dev_name(&device->dev));
 737
 738         return 0;
 739
 740  err:
 741         mutex_lock(&acpi_device_lock);
 742         if (device->parent)
 743                 list_del(&device->node);
 744         list_del(&device->wakeup_list);
 745
 746  err_unlock:
 747         mutex_unlock(&acpi_device_lock);
 748
 749         acpi_detach_data(device->handle, acpi_scan_drop_device);
 750         return result;
 751 }
 752
 753 /* --------------------------------------------------------------------------
 754                                  Device Enumeration
 755    -------------------------------------------------------------------------- */
 756 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 757 {
 758         struct acpi_device *device = NULL;
 759         acpi_status status;
 760
 761         /*
 762          * Fixed hardware devices do not appear in the namespace and do not
 763          * have handles, but we fabricate acpi_devices for them, so we have
 764          * to deal with them specially.
 765          */
 766         if (!handle)
 767                 return acpi_root;
 768
 769         do {
 770                 status = acpi_get_parent(handle, &handle);
 771                 if (ACPI_FAILURE(status))
 772                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 773         } while (acpi_bus_get_device(handle, &device));
 774         return device;
 775 }
 776
 777 acpi_status
 778 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 779 {
 780         acpi_status status;
 781         acpi_handle tmp;
 782         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 783         union acpi_object *obj;
 784
 785         status = acpi_get_handle(handle, "_EJD", &tmp);
 786         if (ACPI_FAILURE(status))
 787                 return status;
 788
 789         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 790         if (ACPI_SUCCESS(status)) {
 791                 obj = buffer.pointer;
 792                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 793                                          ejd);
 794                 kfree(buffer.pointer);
 795         }
 796         return status;
 797 }
 798 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 799
 800 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 801                                         struct acpi_device_wakeup *wakeup)
 802 {
 803         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 804         union acpi_object *package = NULL;
 805         union acpi_object *element = NULL;
 806         acpi_status status;
 807         int err = -ENODATA;
 808
 809         if (!wakeup)
 810                 return -EINVAL;
 811
 812         INIT_LIST_HEAD(&wakeup->resources);
 813
 814         /* _PRW */
 815         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 816         if (ACPI_FAILURE(status)) {
 817                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 818                 return err;
 819         }
 820
 821         package = (union acpi_object *)buffer.pointer;
 822
 823         if (!package || package->package.count < 2)
 824                 goto out;
 825
 826         element = &(package->package.elements[0]);
 827         if (!element)
 828                 goto out;
 829
 830         if (element->type == ACPI_TYPE_PACKAGE) {
 831                 if ((element->package.count < 2) ||
 832                     (element->package.elements[0].type !=
 833                      ACPI_TYPE_LOCAL_REFERENCE)
 834                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 835                         goto out;
 836
 837                 wakeup->gpe_device =
 838                     element->package.elements[0].reference.handle;
 839                 wakeup->gpe_number =
 840                     (u32) element->package.elements[1].integer.value;
 841         } else if (element->type == ACPI_TYPE_INTEGER) {
 842                 wakeup->gpe_device = NULL;
 843                 wakeup->gpe_number = element->integer.value;
 844         } else {
 845                 goto out;
 846         }
 847
 848         element = &(package->package.elements[1]);
 849         if (element->type != ACPI_TYPE_INTEGER)
 850                 goto out;
 851
 852         wakeup->sleep_state = element->integer.value;
 853
 854         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 855         if (err)
 856                 goto out;
 857
 858         if (!list_empty(&wakeup->resources)) {
 859                 int sleep_state;
 860
 861                 err = acpi_power_wakeup_list_init(&wakeup->resources,
 862                                                   &sleep_state);
 863                 if (err) {
 864                         acpi_handle_warn(handle, "Retrieving current states "
 865                                          "of wakeup power resources failed\n");
 866                         acpi_power_resources_list_free(&wakeup->resources);
 867                         goto out;
 868                 }
 869                 if (sleep_state < wakeup->sleep_state) {
 870                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
 871                                          "(S%d) by S%d from power resources\n",
 872                                          (int)wakeup->sleep_state, sleep_state);
 873                         wakeup->sleep_state = sleep_state;
 874                 }
 875         }
 876
 877  out:
 878         kfree(buffer.pointer);
 879         return err;
 880 }
 881
 882 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
 883 {
 884         static const struct acpi_device_id button_device_ids[] = {
 885                 {"PNP0C0C", 0},
 886                 {"PNP0C0D", 0},
 887                 {"PNP0C0E", 0},
 888                 {"", 0},
 889         };
 890         struct acpi_device_wakeup *wakeup = &device->wakeup;
 891         acpi_status status;
 892
 893         wakeup->flags.notifier_present = 0;
 894
 895         /* Power button, Lid switch always enable wakeup */
 896         if (!acpi_match_device_ids(device, button_device_ids)) {
 897                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 898                         /* Do not use Lid/sleep button for S5 wakeup */
 899                         if (wakeup->sleep_state == ACPI_STATE_S5)
 900                                 wakeup->sleep_state = ACPI_STATE_S4;
 901                 }
 902                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 903                 device_set_wakeup_capable(&device->dev, true);
 904                 return true;
 905         }
 906
 907         status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 908                                          wakeup->gpe_number);
 909         return ACPI_SUCCESS(status);
 910 }
 911
 912 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 913 {
 914         int err;
 915
 916         /* Presence of _PRW indicates wake capable */
 917         if (!acpi_has_method(device->handle, "_PRW"))
 918                 return;
 919
 920         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
 921                                                            &device->wakeup);
 922         if (err) {
 923                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
 924                 return;
 925         }
 926
 927         device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
 928         device->wakeup.prepare_count = 0;
 929         /*
 930          * Call _PSW/_DSW object to disable its ability to wake the sleeping
 931          * system for the ACPI device with the _PRW object.
 932          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 933          * So it is necessary to call _DSW object first. Only when it is not
 934          * present will the _PSW object used.
 935          */
 936         err = acpi_device_sleep_wake(device, 0, 0, 0);
 937         if (err)
 938                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 939                                 "error in _DSW or _PSW evaluation\n"));
 940 }
 941
 942 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 943 {
 944         struct acpi_device_power_state *ps = &device->power.states[state];
 945         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 946         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 947         acpi_status status;
 948
 949         INIT_LIST_HEAD(&ps->resources);
 950
 951         /* Evaluate "_PRx" to get referenced power resources */
 952         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 953         if (ACPI_SUCCESS(status)) {
 954                 union acpi_object *package = buffer.pointer;
 955
 956                 if (buffer.length && package
 957                     && package->type == ACPI_TYPE_PACKAGE
 958                     && package->package.count)
 959                         acpi_extract_power_resources(package, 0, &ps->resources);
 960
 961                 ACPI_FREE(buffer.pointer);
 962         }
 963
 964         /* Evaluate "_PSx" to see if we can do explicit sets */
 965         pathname[2] = 'S';
 966         if (acpi_has_method(device->handle, pathname))
 967                 ps->flags.explicit_set = 1;
 968
 969         /* State is valid if there are means to put the device into it. */
 970         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
 971                 ps->flags.valid = 1;
 972
 973         ps->power = -1;         /* Unknown - driver assigned */
 974         ps->latency = -1;       /* Unknown - driver assigned */
 975 }
 976
 977 static void acpi_bus_get_power_flags(struct acpi_device *device)
 978 {
 979         u32 i;
 980
 981         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 982         if (!acpi_has_method(device->handle, "_PS0") &&
 983             !acpi_has_method(device->handle, "_PR0"))
 984                 return;
 985
 986         device->flags.power_manageable = 1;
 987
 988         /*
 989          * Power Management Flags
 990          */
 991         if (acpi_has_method(device->handle, "_PSC"))
 992                 device->power.flags.explicit_get = 1;
 993
 994         if (acpi_has_method(device->handle, "_IRC"))
 995                 device->power.flags.inrush_current = 1;
 996
 997         if (acpi_has_method(device->handle, "_DSW"))
 998                 device->power.flags.dsw_present = 1;
 999
1000         /*
1001          * Enumerate supported power management states
1002          */
1003         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1004                 acpi_bus_init_power_state(device, i);
1005
1006         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1007
1008         /* Set the defaults for D0 and D3hot (always supported). */
1009         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1010         device->power.states[ACPI_STATE_D0].power = 100;
1011         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1012
1013         /*
1014          * Use power resources only if the D0 list of them is populated, because
1015          * some platforms may provide _PR3 only to indicate D3cold support and
1016          * in those cases the power resources list returned by it may be bogus.
1017          */
1018         if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1019                 device->power.flags.power_resources = 1;
1020                 /*
1021                  * D3cold is supported if the D3hot list of power resources is
1022                  * not empty.
1023                  */
1024                 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1025                         device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1026         }
1027
1028         if (acpi_bus_init_power(device))
1029                 device->flags.power_manageable = 0;
1030 }
1031
1032 static void acpi_bus_get_flags(struct acpi_device *device)
1033 {
1034         /* Presence of _STA indicates 'dynamic_status' */
1035         if (acpi_has_method(device->handle, "_STA"))
1036                 device->flags.dynamic_status = 1;
1037
1038         /* Presence of _RMV indicates 'removable' */
1039         if (acpi_has_method(device->handle, "_RMV"))
1040                 device->flags.removable = 1;
1041
1042         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1043         if (acpi_has_method(device->handle, "_EJD") ||
1044             acpi_has_method(device->handle, "_EJ0"))
1045                 device->flags.ejectable = 1;
1046 }
1047
1048 static void acpi_device_get_busid(struct acpi_device *device)
1049 {
1050         char bus_id[5] = { '?', 0 };
1051         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1052         int i = 0;
1053
1054         /*
1055          * Bus ID
1056          * ------
1057          * The device's Bus ID is simply the object name.
1058          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1059          */
1060         if (ACPI_IS_ROOT_DEVICE(device)) {
1061                 strcpy(device->pnp.bus_id, "ACPI");
1062                 return;
1063         }
1064
1065         switch (device->device_type) {
1066         case ACPI_BUS_TYPE_POWER_BUTTON:
1067                 strcpy(device->pnp.bus_id, "PWRF");
1068                 break;
1069         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1070                 strcpy(device->pnp.bus_id, "SLPF");
1071                 break;
1072         case ACPI_BUS_TYPE_ECDT_EC:
1073                 strcpy(device->pnp.bus_id, "ECDT");
1074                 break;
1075         default:
1076                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1077                 /* Clean up trailing underscores (if any) */
1078                 for (i = 3; i > 1; i--) {
1079                         if (bus_id[i] == '_')
1080                                 bus_id[i] = '\0';
1081                         else
1082                                 break;
1083                 }
1084                 strcpy(device->pnp.bus_id, bus_id);
1085                 break;
1086         }
1087 }
1088
1089 /*
1090  * acpi_ata_match - see if an acpi object is an ATA device
1091  *
1092  * If an acpi object has one of the ACPI ATA methods defined,
1093  * then we can safely call it an ATA device.
1094  */
1095 bool acpi_ata_match(acpi_handle handle)
1096 {
1097         return acpi_has_method(handle, "_GTF") ||
1098                acpi_has_method(handle, "_GTM") ||
1099                acpi_has_method(handle, "_STM") ||
1100                acpi_has_method(handle, "_SDD");
1101 }
1102
1103 /*
1104  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1105  *
1106  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1107  * then we can safely call it an ejectable drive bay
1108  */
1109 bool acpi_bay_match(acpi_handle handle)
1110 {
1111         acpi_handle phandle;
1112
1113         if (!acpi_has_method(handle, "_EJ0"))
1114                 return false;
1115         if (acpi_ata_match(handle))
1116                 return true;
1117         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1118                 return false;
1119
1120         return acpi_ata_match(phandle);
1121 }
1122
1123 bool acpi_device_is_battery(struct acpi_device *adev)
1124 {
1125         struct acpi_hardware_id *hwid;
1126
1127         list_for_each_entry(hwid, &adev->pnp.ids, list)
1128                 if (!strcmp("PNP0C0A", hwid->id))
1129                         return true;
1130
1131         return false;
1132 }
1133
1134 static bool is_ejectable_bay(struct acpi_device *adev)
1135 {
1136         acpi_handle handle = adev->handle;
1137
1138         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1139                 return true;
1140
1141         return acpi_bay_match(handle);
1142 }
1143
1144 /*
1145  * acpi_dock_match - see if an acpi object has a _DCK method
1146  */
1147 bool acpi_dock_match(acpi_handle handle)
1148 {
1149         return acpi_has_method(handle, "_DCK");
1150 }
1151
1152 static acpi_status
1153 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1154                           void **return_value)
1155 {
1156         long *cap = context;
1157
1158         if (acpi_has_method(handle, "_BCM") &&
1159             acpi_has_method(handle, "_BCL")) {
1160                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1161                                   "support\n"));
1162                 *cap |= ACPI_VIDEO_BACKLIGHT;
1163                 /* We have backlight support, no need to scan further */
1164                 return AE_CTRL_TERMINATE;
1165         }
1166         return 0;
1167 }
1168
1169 /* Returns true if the ACPI object is a video device which can be
1170  * handled by video.ko.
1171  * The device will get a Linux specific CID added in scan.c to
1172  * identify the device as an ACPI graphics device
1173  * Be aware that the graphics device may not be physically present
1174  * Use acpi_video_get_capabilities() to detect general ACPI video
1175  * capabilities of present cards
1176  */
1177 long acpi_is_video_device(acpi_handle handle)
1178 {
1179         long video_caps = 0;
1180
1181         /* Is this device able to support video switching ? */
1182         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1183                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1184
1185         /* Is this device able to retrieve a video ROM ? */
1186         if (acpi_has_method(handle, "_ROM"))
1187                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1188
1189         /* Is this device able to configure which video head to be POSTed ? */
1190         if (acpi_has_method(handle, "_VPO") &&
1191             acpi_has_method(handle, "_GPD") &&
1192             acpi_has_method(handle, "_SPD"))
1193                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1194
1195         /* Only check for backlight functionality if one of the above hit. */
1196         if (video_caps)
1197                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1198                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1199                                     &video_caps, NULL);
1200
1201         return video_caps;
1202 }
1203 EXPORT_SYMBOL(acpi_is_video_device);
1204
1205 const char *acpi_device_hid(struct acpi_device *device)
1206 {
1207         struct acpi_hardware_id *hid;
1208
1209         if (list_empty(&device->pnp.ids))
1210                 return dummy_hid;
1211
1212         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1213         return hid->id;
1214 }
1215 EXPORT_SYMBOL(acpi_device_hid);
1216
1217 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1218 {
1219         struct acpi_hardware_id *id;
1220
1221         id = kmalloc(sizeof(*id), GFP_KERNEL);
1222         if (!id)
1223                 return;
1224
1225         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1226         if (!id->id) {
1227                 kfree(id);
1228                 return;
1229         }
1230
1231         list_add_tail(&id->list, &pnp->ids);
1232         pnp->type.hardware_id = 1;
1233 }
1234
1235 /*
1236  * Old IBM workstations have a DSDT bug wherein the SMBus object
1237  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1238  * prefix.  Work around this.
1239  */
1240 static bool acpi_ibm_smbus_match(acpi_handle handle)
1241 {
1242         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1243         struct acpi_buffer path = { sizeof(node_name), node_name };
1244
1245         if (!dmi_name_in_vendors("IBM"))
1246                 return false;
1247
1248         /* Look for SMBS object */
1249         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1250             strcmp("SMBS", path.pointer))
1251                 return false;
1252
1253         /* Does it have the necessary (but misnamed) methods? */
1254         if (acpi_has_method(handle, "SBI") &&
1255             acpi_has_method(handle, "SBR") &&
1256             acpi_has_method(handle, "SBW"))
1257                 return true;
1258
1259         return false;
1260 }
1261
1262 static bool acpi_object_is_system_bus(acpi_handle handle)
1263 {
1264         acpi_handle tmp;
1265
1266         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1267             tmp == handle)
1268                 return true;
1269         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1270             tmp == handle)
1271                 return true;
1272
1273         return false;
1274 }
1275
1276 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1277                                 int device_type)
1278 {
1279         acpi_status status;
1280         struct acpi_device_info *info;
1281         struct acpi_pnp_device_id_list *cid_list;
1282         int i;
1283
1284         switch (device_type) {
1285         case ACPI_BUS_TYPE_DEVICE:
1286                 if (handle == ACPI_ROOT_OBJECT) {
1287                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1288                         break;
1289                 }
1290
1291                 status = acpi_get_object_info(handle, &info);
1292                 if (ACPI_FAILURE(status)) {
1293                         pr_err(PREFIX "%s: Error reading device info\n",
1294                                         __func__);
1295                         return;
1296                 }
1297
1298                 if (info->valid & ACPI_VALID_HID) {
1299                         acpi_add_id(pnp, info->hardware_id.string);
1300                         pnp->type.platform_id = 1;
1301                 }
1302                 if (info->valid & ACPI_VALID_CID) {
1303                         cid_list = &info->compatible_id_list;
1304                         for (i = 0; i < cid_list->count; i++)
1305                                 acpi_add_id(pnp, cid_list->ids[i].string);
1306                 }
1307                 if (info->valid & ACPI_VALID_ADR) {
1308                         pnp->bus_address = info->address;
1309                         pnp->type.bus_address = 1;
1310                 }
1311                 if (info->valid & ACPI_VALID_UID)
1312                         pnp->unique_id = kstrdup(info->unique_id.string,
1313                                                         GFP_KERNEL);
1314                 if (info->valid & ACPI_VALID_CLS)
1315                         acpi_add_id(pnp, info->class_code.string);
1316
1317                 kfree(info);
1318
1319                 /*
1320                  * Some devices don't reliably have _HIDs & _CIDs, so add
1321                  * synthetic HIDs to make sure drivers can find them.
1322                  */
1323                 if (acpi_is_video_device(handle))
1324                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1325                 else if (acpi_bay_match(handle))
1326                         acpi_add_id(pnp, ACPI_BAY_HID);
1327                 else if (acpi_dock_match(handle))
1328                         acpi_add_id(pnp, ACPI_DOCK_HID);
1329                 else if (acpi_ibm_smbus_match(handle))
1330                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1331                 else if (list_empty(&pnp->ids) &&
1332                          acpi_object_is_system_bus(handle)) {
1333                         /* \_SB, \_TZ, LNXSYBUS */
1334                         acpi_add_id(pnp, ACPI_BUS_HID);
1335                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1336                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1337                 }
1338
1339                 break;
1340         case ACPI_BUS_TYPE_POWER:
1341                 acpi_add_id(pnp, ACPI_POWER_HID);
1342                 break;
1343         case ACPI_BUS_TYPE_PROCESSOR:
1344                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1345                 break;
1346         case ACPI_BUS_TYPE_THERMAL:
1347                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1348                 break;
1349         case ACPI_BUS_TYPE_POWER_BUTTON:
1350                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1351                 break;
1352         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1353                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1354                 break;
1355         case ACPI_BUS_TYPE_ECDT_EC:
1356                 acpi_add_id(pnp, ACPI_ECDT_HID);
1357                 break;
1358         }
1359 }
1360
1361 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1362 {
1363         struct acpi_hardware_id *id, *tmp;
1364
1365         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1366                 kfree_const(id->id);
1367                 kfree(id);
1368         }
1369         kfree(pnp->unique_id);
1370 }
1371
1372 /**
1373  * acpi_dma_supported - Check DMA support for the specified device.
1374  * @adev: The pointer to acpi device
1375  *
1376  * Return false if DMA is not supported. Otherwise, return true
1377  */
1378 bool acpi_dma_supported(struct acpi_device *adev)
1379 {
1380         if (!adev)
1381                 return false;
1382
1383         if (adev->flags.cca_seen)
1384                 return true;
1385
1386         /*
1387         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1388         * DMA on "Intel platforms".  Presumably that includes all x86 and
1389         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1390         */
1391         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1392                 return true;
1393
1394         return false;
1395 }
1396
1397 /**
1398  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1399  * @adev: The pointer to acpi device
1400  *
1401  * Return enum dev_dma_attr.
1402  */
1403 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1404 {
1405         if (!acpi_dma_supported(adev))
1406                 return DEV_DMA_NOT_SUPPORTED;
1407
1408         if (adev->flags.coherent_dma)
1409                 return DEV_DMA_COHERENT;
1410         else
1411                 return DEV_DMA_NON_COHERENT;
1412 }
1413
1414 /**
1415  * acpi_dma_get_range() - Get device DMA parameters.
1416  *
1417  * @dev: device to configure
1418  * @dma_addr: pointer device DMA address result
1419  * @offset: pointer to the DMA offset result
1420  * @size: pointer to DMA range size result
1421  *
1422  * Evaluate DMA regions and return respectively DMA region start, offset
1423  * and size in dma_addr, offset and size on parsing success; it does not
1424  * update the passed in values on failure.
1425  *
1426  * Return 0 on success, < 0 on failure.
1427  */
1428 int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1429                        u64 *size)
1430 {
1431         struct acpi_device *adev;
1432         LIST_HEAD(list);
1433         struct resource_entry *rentry;
1434         int ret;
1435         struct device *dma_dev = dev;
1436         u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1437
1438         /*
1439          * Walk the device tree chasing an ACPI companion with a _DMA
1440          * object while we go. Stop if we find a device with an ACPI
1441          * companion containing a _DMA method.
1442          */
1443         do {
1444                 adev = ACPI_COMPANION(dma_dev);
1445                 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1446                         break;
1447
1448                 dma_dev = dma_dev->parent;
1449         } while (dma_dev);
1450
1451         if (!dma_dev)
1452                 return -ENODEV;
1453
1454         if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1455                 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1456                 return -EINVAL;
1457         }
1458
1459         ret = acpi_dev_get_dma_resources(adev, &list);
1460         if (ret > 0) {
1461                 list_for_each_entry(rentry, &list, node) {
1462                         if (dma_offset && rentry->offset != dma_offset) {
1463                                 ret = -EINVAL;
1464                                 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1465                                 goto out;
1466                         }
1467                         dma_offset = rentry->offset;
1468
1469                         /* Take lower and upper limits */
1470                         if (rentry->res->start < dma_start)
1471                                 dma_start = rentry->res->start;
1472                         if (rentry->res->end > dma_end)
1473                                 dma_end = rentry->res->end;
1474                 }
1475
1476                 if (dma_start >= dma_end) {
1477                         ret = -EINVAL;
1478                         dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1479                         goto out;
1480                 }
1481
1482                 *dma_addr = dma_start - dma_offset;
1483                 len = dma_end - dma_start;
1484                 *size = max(len, len + 1);
1485                 *offset = dma_offset;
1486         }
1487  out:
1488         acpi_dev_free_resource_list(&list);
1489
1490         return ret >= 0 ? 0 : ret;
1491 }
1492
1493 /**
1494  * acpi_dma_configure - Set-up DMA configuration for the device.
1495  * @dev: The pointer to the device
1496  * @attr: device dma attributes
1497  */
1498 int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
1499 {
1500         const struct iommu_ops *iommu;
1501         u64 dma_addr = 0, size = 0;
1502
1503         iort_dma_setup(dev, &dma_addr, &size);
1504
1505         iommu = iort_iommu_configure(dev);
1506         if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
1507                 return -EPROBE_DEFER;
1508
1509         arch_setup_dma_ops(dev, dma_addr, size,
1510                                 iommu, attr == DEV_DMA_COHERENT);
1511
1512         return 0;
1513 }
1514 EXPORT_SYMBOL_GPL(acpi_dma_configure);
1515
1516 /**
1517  * acpi_dma_deconfigure - Tear-down DMA configuration for the device.
1518  * @dev: The pointer to the device
1519  */
1520 void acpi_dma_deconfigure(struct device *dev)
1521 {
1522         arch_teardown_dma_ops(dev);
1523 }
1524 EXPORT_SYMBOL_GPL(acpi_dma_deconfigure);
1525
1526 static void acpi_init_coherency(struct acpi_device *adev)
1527 {
1528         unsigned long long cca = 0;
1529         acpi_status status;
1530         struct acpi_device *parent = adev->parent;
1531
1532         if (parent && parent->flags.cca_seen) {
1533                 /*
1534                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1535                  * already saw one.
1536                  */
1537                 adev->flags.cca_seen = 1;
1538                 cca = parent->flags.coherent_dma;
1539         } else {
1540                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1541                                                NULL, &cca);
1542                 if (ACPI_SUCCESS(status))
1543                         adev->flags.cca_seen = 1;
1544                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1545                         /*
1546                          * If architecture does not specify that _CCA is
1547                          * required for DMA-able devices (e.g. x86),
1548                          * we default to _CCA=1.
1549                          */
1550                         cca = 1;
1551                 else
1552                         acpi_handle_debug(adev->handle,
1553                                           "ACPI device is missing _CCA.\n");
1554         }
1555
1556         adev->flags.coherent_dma = cca;
1557 }
1558
1559 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1560 {
1561         bool *is_serial_bus_slave_p = data;
1562
1563         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1564                 return 1;
1565
1566         *is_serial_bus_slave_p = true;
1567
1568          /* no need to do more checking */
1569         return -1;
1570 }
1571
1572 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1573 {
1574         struct acpi_device *parent = device->parent;
1575         static const struct acpi_device_id indirect_io_hosts[] = {
1576                 {"HISI0191", 0},
1577                 {}
1578         };
1579
1580         return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1581 }
1582
1583 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1584 {
1585         struct list_head resource_list;
1586         bool is_serial_bus_slave = false;
1587         /*
1588          * These devices have multiple I2cSerialBus resources and an i2c-client
1589          * must be instantiated for each, each with its own i2c_device_id.
1590          * Normally we only instantiate an i2c-client for the first resource,
1591          * using the ACPI HID as id. These special cases are handled by the
1592          * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
1593          * which i2c_device_id to use for each resource.
1594          */
1595         static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
1596                 {"BSG1160", },
1597                 {"INT33FE", },
1598                 {}
1599         };
1600
1601         if (acpi_is_indirect_io_slave(device))
1602                 return true;
1603
1604         /* Macs use device properties in lieu of _CRS resources */
1605         if (x86_apple_machine &&
1606             (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1607              fwnode_property_present(&device->fwnode, "i2cAddress") ||
1608              fwnode_property_present(&device->fwnode, "baud")))
1609                 return true;
1610
1611         /* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */
1612         if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
1613                 return false;
1614
1615         INIT_LIST_HEAD(&resource_list);
1616         acpi_dev_get_resources(device, &resource_list,
1617                                acpi_check_serial_bus_slave,
1618                                &is_serial_bus_slave);
1619         acpi_dev_free_resource_list(&resource_list);
1620
1621         return is_serial_bus_slave;
1622 }
1623
1624 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1625                              int type, unsigned long long sta)
1626 {
1627         INIT_LIST_HEAD(&device->pnp.ids);
1628         device->device_type = type;
1629         device->handle = handle;
1630         device->parent = acpi_bus_get_parent(handle);
1631         device->fwnode.ops = &acpi_device_fwnode_ops;
1632         acpi_set_device_status(device, sta);
1633         acpi_device_get_busid(device);
1634         acpi_set_pnp_ids(handle, &device->pnp, type);
1635         acpi_init_properties(device);
1636         acpi_bus_get_flags(device);
1637         device->flags.match_driver = false;
1638         device->flags.initialized = true;
1639         device->flags.enumeration_by_parent =
1640                 acpi_device_enumeration_by_parent(device);
1641         acpi_device_clear_enumerated(device);
1642         device_initialize(&device->dev);
1643         dev_set_uevent_suppress(&device->dev, true);
1644         acpi_init_coherency(device);
1645         /* Assume there are unmet deps until acpi_device_dep_initialize() runs */
1646         device->dep_unmet = 1;
1647 }
1648
1649 void acpi_device_add_finalize(struct acpi_device *device)
1650 {
1651         dev_set_uevent_suppress(&device->dev, false);
1652         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1653 }
1654
1655 static int acpi_add_single_object(struct acpi_device **child,
1656                                   acpi_handle handle, int type,
1657                                   unsigned long long sta)
1658 {
1659         int result;
1660         struct acpi_device *device;
1661         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1662
1663         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1664         if (!device) {
1665                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1666                 return -ENOMEM;
1667         }
1668
1669         acpi_init_device_object(device, handle, type, sta);
1670         /*
1671          * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so
1672          * that we can call acpi_bus_get_status() and use its quirk handling.
1673          * Note this must be done before the get power-/wakeup_dev-flags calls.
1674          */
1675         if (type == ACPI_BUS_TYPE_DEVICE)
1676                 if (acpi_bus_get_status(device) < 0)
1677                         acpi_set_device_status(device, 0);
1678
1679         acpi_bus_get_power_flags(device);
1680         acpi_bus_get_wakeup_device_flags(device);
1681
1682         result = acpi_device_add(device, acpi_device_release);
1683         if (result) {
1684                 acpi_device_release(&device->dev);
1685                 return result;
1686         }
1687
1688         acpi_power_add_remove_device(device, true);
1689         acpi_device_add_finalize(device);
1690         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1691         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1692                 dev_name(&device->dev), (char *) buffer.pointer,
1693                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1694         kfree(buffer.pointer);
1695         *child = device;
1696         return 0;
1697 }
1698
1699 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1700                                             void *context)
1701 {
1702         struct resource *res = context;
1703
1704         if (acpi_dev_resource_memory(ares, res))
1705                 return AE_CTRL_TERMINATE;
1706
1707         return AE_OK;
1708 }
1709
1710 static bool acpi_device_should_be_hidden(acpi_handle handle)
1711 {
1712         acpi_status status;
1713         struct resource res;
1714
1715         /* Check if it should ignore the UART device */
1716         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1717                 return false;
1718
1719         /*
1720          * The UART device described in SPCR table is assumed to have only one
1721          * memory resource present. So we only look for the first one here.
1722          */
1723         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1724                                      acpi_get_resource_memory, &res);
1725         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1726                 return false;
1727
1728         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1729                          &res.start);
1730
1731         return true;
1732 }
1733
1734 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1735                                     unsigned long long *sta)
1736 {
1737         acpi_status status;
1738         acpi_object_type acpi_type;
1739
1740         status = acpi_get_type(handle, &acpi_type);
1741         if (ACPI_FAILURE(status))
1742                 return -ENODEV;
1743
1744         switch (acpi_type) {
1745         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1746         case ACPI_TYPE_DEVICE:
1747                 if (acpi_device_should_be_hidden(handle))
1748                         return -ENODEV;
1749
1750                 *type = ACPI_BUS_TYPE_DEVICE;
1751                 /*
1752                  * acpi_add_single_object updates this once we've an acpi_device
1753                  * so that acpi_bus_get_status' quirk handling can be used.
1754                  */
1755                 *sta = ACPI_STA_DEFAULT;
1756                 break;
1757         case ACPI_TYPE_PROCESSOR:
1758                 *type = ACPI_BUS_TYPE_PROCESSOR;
1759                 status = acpi_bus_get_status_handle(handle, sta);
1760                 if (ACPI_FAILURE(status))
1761                         return -ENODEV;
1762                 break;
1763         case ACPI_TYPE_THERMAL:
1764                 *type = ACPI_BUS_TYPE_THERMAL;
1765                 *sta = ACPI_STA_DEFAULT;
1766                 break;
1767         case ACPI_TYPE_POWER:
1768                 *type = ACPI_BUS_TYPE_POWER;
1769                 *sta = ACPI_STA_DEFAULT;
1770                 break;
1771         default:
1772                 return -ENODEV;
1773         }
1774
1775         return 0;
1776 }
1777
1778 bool acpi_device_is_present(const struct acpi_device *adev)
1779 {
1780         return adev->status.present || adev->status.functional;
1781 }
1782
1783 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1784                                        const char *idstr,
1785                                        const struct acpi_device_id **matchid)
1786 {
1787         const struct acpi_device_id *devid;
1788
1789         if (handler->match)
1790                 return handler->match(idstr, matchid);
1791
1792         for (devid = handler->ids; devid->id[0]; devid++)
1793                 if (!strcmp((char *)devid->id, idstr)) {
1794                         if (matchid)
1795                                 *matchid = devid;
1796
1797                         return true;
1798                 }
1799
1800         return false;
1801 }
1802
1803 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1804                                         const struct acpi_device_id **matchid)
1805 {
1806         struct acpi_scan_handler *handler;
1807
1808         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1809                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1810                         return handler;
1811
1812         return NULL;
1813 }
1814
1815 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1816 {
1817         if (!!hotplug->enabled == !!val)
1818                 return;
1819
1820         mutex_lock(&acpi_scan_lock);
1821
1822         hotplug->enabled = val;
1823
1824         mutex_unlock(&acpi_scan_lock);
1825 }
1826
1827 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1828 {
1829         struct acpi_hardware_id *hwid;
1830
1831         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1832                 acpi_dock_add(adev);
1833                 return;
1834         }
1835         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1836                 struct acpi_scan_handler *handler;
1837
1838                 handler = acpi_scan_match_handler(hwid->id, NULL);
1839                 if (handler) {
1840                         adev->flags.hotplug_notify = true;
1841                         break;
1842                 }
1843         }
1844 }
1845
1846 static void acpi_device_dep_initialize(struct acpi_device *adev)
1847 {
1848         struct acpi_dep_data *dep;
1849         struct acpi_handle_list dep_devices;
1850         acpi_status status;
1851         int i;
1852
1853         adev->dep_unmet = 0;
1854
1855         if (!acpi_has_method(adev->handle, "_DEP"))
1856                 return;
1857
1858         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1859                                         &dep_devices);
1860         if (ACPI_FAILURE(status)) {
1861                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1862                 return;
1863         }
1864
1865         for (i = 0; i < dep_devices.count; i++) {
1866                 struct acpi_device_info *info;
1867                 int skip;
1868
1869                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1870                 if (ACPI_FAILURE(status)) {
1871                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1872                         continue;
1873                 }
1874
1875                 /*
1876                  * Skip the dependency of Windows System Power
1877                  * Management Controller
1878                  */
1879                 skip = info->valid & ACPI_VALID_HID &&
1880                         !strcmp(info->hardware_id.string, "INT3396");
1881
1882                 kfree(info);
1883
1884                 if (skip)
1885                         continue;
1886
1887                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1888                 if (!dep)
1889                         return;
1890
1891                 dep->master = dep_devices.handles[i];
1892                 dep->slave  = adev->handle;
1893                 adev->dep_unmet++;
1894
1895                 mutex_lock(&acpi_dep_list_lock);
1896                 list_add_tail(&dep->node , &acpi_dep_list);
1897                 mutex_unlock(&acpi_dep_list_lock);
1898         }
1899 }
1900
1901 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1902                                       void *not_used, void **return_value)
1903 {
1904         struct acpi_device *device = NULL;
1905         int type;
1906         unsigned long long sta;
1907         int result;
1908
1909         acpi_bus_get_device(handle, &device);
1910         if (device)
1911                 goto out;
1912
1913         result = acpi_bus_type_and_status(handle, &type, &sta);
1914         if (result)
1915                 return AE_OK;
1916
1917         if (type == ACPI_BUS_TYPE_POWER) {
1918                 acpi_add_power_resource(handle);
1919                 return AE_OK;
1920         }
1921
1922         acpi_add_single_object(&device, handle, type, sta);
1923         if (!device)
1924                 return AE_CTRL_DEPTH;
1925
1926         acpi_scan_init_hotplug(device);
1927         acpi_device_dep_initialize(device);
1928
1929  out:
1930         if (!*return_value)
1931                 *return_value = device;
1932
1933         return AE_OK;
1934 }
1935
1936 static void acpi_default_enumeration(struct acpi_device *device)
1937 {
1938         /*
1939          * Do not enumerate devices with enumeration_by_parent flag set as
1940          * they will be enumerated by their respective parents.
1941          */
1942         if (!device->flags.enumeration_by_parent) {
1943                 acpi_create_platform_device(device, NULL);
1944                 acpi_device_set_enumerated(device);
1945         } else {
1946                 blocking_notifier_call_chain(&acpi_reconfig_chain,
1947                                              ACPI_RECONFIG_DEVICE_ADD, device);
1948         }
1949 }
1950
1951 static const struct acpi_device_id generic_device_ids[] = {
1952         {ACPI_DT_NAMESPACE_HID, },
1953         {"", },
1954 };
1955
1956 static int acpi_generic_device_attach(struct acpi_device *adev,
1957                                       const struct acpi_device_id *not_used)
1958 {
1959         /*
1960          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1961          * below can be unconditional.
1962          */
1963         if (adev->data.of_compatible)
1964                 acpi_default_enumeration(adev);
1965
1966         return 1;
1967 }
1968
1969 static struct acpi_scan_handler generic_device_handler = {
1970         .ids = generic_device_ids,
1971         .attach = acpi_generic_device_attach,
1972 };
1973
1974 static int acpi_scan_attach_handler(struct acpi_device *device)
1975 {
1976         struct acpi_hardware_id *hwid;
1977         int ret = 0;
1978
1979         list_for_each_entry(hwid, &device->pnp.ids, list) {
1980                 const struct acpi_device_id *devid;
1981                 struct acpi_scan_handler *handler;
1982
1983                 handler = acpi_scan_match_handler(hwid->id, &devid);
1984                 if (handler) {
1985                         if (!handler->attach) {
1986                                 device->pnp.type.platform_id = 0;
1987                                 continue;
1988                         }
1989                         device->handler = handler;
1990                         ret = handler->attach(device, devid);
1991                         if (ret > 0)
1992                                 break;
1993
1994                         device->handler = NULL;
1995                         if (ret < 0)
1996                                 break;
1997                 }
1998         }
1999
2000         return ret;
2001 }
2002
2003 static void acpi_bus_attach(struct acpi_device *device)
2004 {
2005         struct acpi_device *child;
2006         acpi_handle ejd;
2007         int ret;
2008
2009         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2010                 register_dock_dependent_device(device, ejd);
2011
2012         acpi_bus_get_status(device);
2013         /* Skip devices that are not present. */
2014         if (!acpi_device_is_present(device)) {
2015                 device->flags.initialized = false;
2016                 acpi_device_clear_enumerated(device);
2017                 device->flags.power_manageable = 0;
2018                 return;
2019         }
2020         if (device->handler)
2021                 goto ok;
2022
2023         if (!device->flags.initialized) {
2024                 device->flags.power_manageable =
2025                         device->power.states[ACPI_STATE_D0].flags.valid;
2026                 if (acpi_bus_init_power(device))
2027                         device->flags.power_manageable = 0;
2028
2029                 device->flags.initialized = true;
2030         } else if (device->flags.visited) {
2031                 goto ok;
2032         }
2033
2034         ret = acpi_scan_attach_handler(device);
2035         if (ret < 0)
2036                 return;
2037
2038         device->flags.match_driver = true;
2039         if (ret > 0 && !device->flags.enumeration_by_parent) {
2040                 acpi_device_set_enumerated(device);
2041                 goto ok;
2042         }
2043
2044         ret = device_attach(&device->dev);
2045         if (ret < 0)
2046                 return;
2047
2048         if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2049                 acpi_default_enumeration(device);
2050         else
2051                 acpi_device_set_enumerated(device);
2052
2053  ok:
2054         list_for_each_entry(child, &device->children, node)
2055                 acpi_bus_attach(child);
2056
2057         if (device->handler && device->handler->hotplug.notify_online)
2058                 device->handler->hotplug.notify_online(device);
2059 }
2060
2061 void acpi_walk_dep_device_list(acpi_handle handle)
2062 {
2063         struct acpi_dep_data *dep, *tmp;
2064         struct acpi_device *adev;
2065
2066         mutex_lock(&acpi_dep_list_lock);
2067         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2068                 if (dep->master == handle) {
2069                         acpi_bus_get_device(dep->slave, &adev);
2070                         if (!adev)
2071                                 continue;
2072
2073                         adev->dep_unmet--;
2074                         if (!adev->dep_unmet)
2075                                 acpi_bus_attach(adev);
2076                         list_del(&dep->node);
2077                         kfree(dep);
2078                 }
2079         }
2080         mutex_unlock(&acpi_dep_list_lock);
2081 }
2082 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2083
2084 /**
2085  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2086  * @handle: Root of the namespace scope to scan.
2087  *
2088  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2089  * found devices.
2090  *
2091  * If no devices were found, -ENODEV is returned, but it does not mean that
2092  * there has been a real error.  There just have been no suitable ACPI objects
2093  * in the table trunk from which the kernel could create a device and add an
2094  * appropriate driver.
2095  *
2096  * Must be called under acpi_scan_lock.
2097  */
2098 int acpi_bus_scan(acpi_handle handle)
2099 {
2100         void *device = NULL;
2101
2102         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2103                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2104                                     acpi_bus_check_add, NULL, NULL, &device);
2105
2106         if (device) {
2107                 acpi_bus_attach(device);
2108                 return 0;
2109         }
2110         return -ENODEV;
2111 }
2112 EXPORT_SYMBOL(acpi_bus_scan);
2113
2114 /**
2115  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2116  * @adev: Root of the ACPI namespace scope to walk.
2117  *
2118  * Must be called under acpi_scan_lock.
2119  */
2120 void acpi_bus_trim(struct acpi_device *adev)
2121 {
2122         struct acpi_scan_handler *handler = adev->handler;
2123         struct acpi_device *child;
2124
2125         list_for_each_entry_reverse(child, &adev->children, node)
2126                 acpi_bus_trim(child);
2127
2128         adev->flags.match_driver = false;
2129         if (handler) {
2130                 if (handler->detach)
2131                         handler->detach(adev);
2132
2133                 adev->handler = NULL;
2134         } else {
2135                 device_release_driver(&adev->dev);
2136         }
2137         /*
2138          * Most likely, the device is going away, so put it into D3cold before
2139          * that.
2140          */
2141         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2142         adev->flags.initialized = false;
2143         acpi_device_clear_enumerated(adev);
2144 }
2145 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2146
2147 int acpi_bus_register_early_device(int type)
2148 {
2149         struct acpi_device *device = NULL;
2150         int result;
2151
2152         result = acpi_add_single_object(&device, NULL,
2153                                         type, ACPI_STA_DEFAULT);
2154         if (result)
2155                 return result;
2156
2157         device->flags.match_driver = true;
2158         return device_attach(&device->dev);
2159 }
2160 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2161
2162 static int acpi_bus_scan_fixed(void)
2163 {
2164         int result = 0;
2165
2166         /*
2167          * Enumerate all fixed-feature devices.
2168          */
2169         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2170                 struct acpi_device *device = NULL;
2171
2172                 result = acpi_add_single_object(&device, NULL,
2173                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2174                                                 ACPI_STA_DEFAULT);
2175                 if (result)
2176                         return result;
2177
2178                 device->flags.match_driver = true;
2179                 result = device_attach(&device->dev);
2180                 if (result < 0)
2181                         return result;
2182
2183                 device_init_wakeup(&device->dev, true);
2184         }
2185
2186         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2187                 struct acpi_device *device = NULL;
2188
2189                 result = acpi_add_single_object(&device, NULL,
2190                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2191                                                 ACPI_STA_DEFAULT);
2192                 if (result)
2193                         return result;
2194
2195                 device->flags.match_driver = true;
2196                 result = device_attach(&device->dev);
2197         }
2198
2199         return result < 0 ? result : 0;
2200 }
2201
2202 static void __init acpi_get_spcr_uart_addr(void)
2203 {
2204         acpi_status status;
2205         struct acpi_table_spcr *spcr_ptr;
2206
2207         status = acpi_get_table(ACPI_SIG_SPCR, 0,
2208                                 (struct acpi_table_header **)&spcr_ptr);
2209         if (ACPI_SUCCESS(status))
2210                 spcr_uart_addr = spcr_ptr->serial_port.address;
2211         else
2212                 printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
2213 }
2214
2215 static bool acpi_scan_initialized;
2216
2217 int __init acpi_scan_init(void)
2218 {
2219         int result;
2220         acpi_status status;
2221         struct acpi_table_stao *stao_ptr;
2222
2223         acpi_pci_root_init();
2224         acpi_pci_link_init();
2225         acpi_processor_init();
2226         acpi_lpss_init();
2227         acpi_apd_init();
2228         acpi_cmos_rtc_init();
2229         acpi_container_init();
2230         acpi_memory_hotplug_init();
2231         acpi_watchdog_init();
2232         acpi_pnp_init();
2233         acpi_int340x_thermal_init();
2234         acpi_amba_init();
2235         acpi_init_lpit();
2236
2237         acpi_scan_add_handler(&generic_device_handler);
2238
2239         /*
2240          * If there is STAO table, check whether it needs to ignore the UART
2241          * device in SPCR table.
2242          */
2243         status = acpi_get_table(ACPI_SIG_STAO, 0,
2244                                 (struct acpi_table_header **)&stao_ptr);
2245         if (ACPI_SUCCESS(status)) {
2246                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2247                         printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
2248
2249                 if (stao_ptr->ignore_uart)
2250                         acpi_get_spcr_uart_addr();
2251         }
2252
2253         acpi_gpe_apply_masked_gpes();
2254         acpi_update_all_gpes();
2255
2256         mutex_lock(&acpi_scan_lock);
2257         /*
2258          * Enumerate devices in the ACPI namespace.
2259          */
2260         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2261         if (result)
2262                 goto out;
2263
2264         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2265         if (result)
2266                 goto out;
2267
2268         /* Fixed feature devices do not exist on HW-reduced platform */
2269         if (!acpi_gbl_reduced_hardware) {
2270                 result = acpi_bus_scan_fixed();
2271                 if (result) {
2272                         acpi_detach_data(acpi_root->handle,
2273                                          acpi_scan_drop_device);
2274                         acpi_device_del(acpi_root);
2275                         put_device(&acpi_root->dev);
2276                         goto out;
2277                 }
2278         }
2279
2280         acpi_scan_initialized = true;
2281
2282  out:
2283         mutex_unlock(&acpi_scan_lock);
2284         return result;
2285 }
2286
2287 static struct acpi_probe_entry *ape;
2288 static int acpi_probe_count;
2289 static DEFINE_MUTEX(acpi_probe_mutex);
2290
2291 static int __init acpi_match_madt(struct acpi_subtable_header *header,
2292                                   const unsigned long end)
2293 {
2294         if (!ape->subtable_valid || ape->subtable_valid(header, ape))
2295                 if (!ape->probe_subtbl(header, end))
2296                         acpi_probe_count++;
2297
2298         return 0;
2299 }
2300
2301 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2302 {
2303         int count = 0;
2304
2305         if (acpi_disabled)
2306                 return 0;
2307
2308         mutex_lock(&acpi_probe_mutex);
2309         for (ape = ap_head; nr; ape++, nr--) {
2310                 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
2311                         acpi_probe_count = 0;
2312                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2313                         count += acpi_probe_count;
2314                 } else {
2315                         int res;
2316                         res = acpi_table_parse(ape->id, ape->probe_table);
2317                         if (!res)
2318                                 count++;
2319                 }
2320         }
2321         mutex_unlock(&acpi_probe_mutex);
2322
2323         return count;
2324 }
2325
2326 struct acpi_table_events_work {
2327         struct work_struct work;
2328         void *table;
2329         u32 event;
2330 };
2331
2332 static void acpi_table_events_fn(struct work_struct *work)
2333 {
2334         struct acpi_table_events_work *tew;
2335
2336         tew = container_of(work, struct acpi_table_events_work, work);
2337
2338         if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2339                 acpi_scan_lock_acquire();
2340                 acpi_bus_scan(ACPI_ROOT_OBJECT);
2341                 acpi_scan_lock_release();
2342         }
2343
2344         kfree(tew);
2345 }
2346
2347 void acpi_scan_table_handler(u32 event, void *table, void *context)
2348 {
2349         struct acpi_table_events_work *tew;
2350
2351         if (!acpi_scan_initialized)
2352                 return;
2353
2354         if (event != ACPI_TABLE_EVENT_LOAD)
2355                 return;
2356
2357         tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2358         if (!tew)
2359                 return;
2360
2361         INIT_WORK(&tew->work, acpi_table_events_fn);
2362         tew->table = table;
2363         tew->event = event;
2364
2365         schedule_work(&tew->work);
2366 }
2367
2368 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2369 {
2370         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2371 }
2372 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2373
2374 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2375 {
2376         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2377 }
2378 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);