drivers/acpi/scan.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * scan.c - support for transforming the ACPI namespace into individual objects
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/init.h>
   8 #include <linux/slab.h>
   9 #include <linux/kernel.h>
  10 #include <linux/acpi.h>
  11 #include <linux/acpi_iort.h>
  12 #include <linux/signal.h>
  13 #include <linux/kthread.h>
  14 #include <linux/dmi.h>
  15 #include <linux/nls.h>
  16 #include <linux/dma-map-ops.h>
  17 #include <linux/platform_data/x86/apple.h>
  18 #include <linux/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(struct acpi_device *dev)
 767 {
 768         acpi_handle handle = dev->handle;
 769         struct acpi_device_wakeup *wakeup = &dev->wakeup;
 770         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 771         union acpi_object *package = NULL;
 772         union acpi_object *element = NULL;
 773         acpi_status status;
 774         int err = -ENODATA;
 775
 776         INIT_LIST_HEAD(&wakeup->resources);
 777
 778         /* _PRW */
 779         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 780         if (ACPI_FAILURE(status)) {
 781                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 782                 return err;
 783         }
 784
 785         package = (union acpi_object *)buffer.pointer;
 786
 787         if (!package || package->package.count < 2)
 788                 goto out;
 789
 790         element = &(package->package.elements[0]);
 791         if (!element)
 792                 goto out;
 793
 794         if (element->type == ACPI_TYPE_PACKAGE) {
 795                 if ((element->package.count < 2) ||
 796                     (element->package.elements[0].type !=
 797                      ACPI_TYPE_LOCAL_REFERENCE)
 798                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 799                         goto out;
 800
 801                 wakeup->gpe_device =
 802                     element->package.elements[0].reference.handle;
 803                 wakeup->gpe_number =
 804                     (u32) element->package.elements[1].integer.value;
 805         } else if (element->type == ACPI_TYPE_INTEGER) {
 806                 wakeup->gpe_device = NULL;
 807                 wakeup->gpe_number = element->integer.value;
 808         } else {
 809                 goto out;
 810         }
 811
 812         element = &(package->package.elements[1]);
 813         if (element->type != ACPI_TYPE_INTEGER)
 814                 goto out;
 815
 816         wakeup->sleep_state = element->integer.value;
 817
 818         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 819         if (err)
 820                 goto out;
 821
 822         if (!list_empty(&wakeup->resources)) {
 823                 int sleep_state;
 824
 825                 err = acpi_power_wakeup_list_init(&wakeup->resources,
 826                                                   &sleep_state);
 827                 if (err) {
 828                         acpi_handle_warn(handle, "Retrieving current states "
 829                                          "of wakeup power resources failed\n");
 830                         acpi_power_resources_list_free(&wakeup->resources);
 831                         goto out;
 832                 }
 833                 if (sleep_state < wakeup->sleep_state) {
 834                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
 835                                          "(S%d) by S%d from power resources\n",
 836                                          (int)wakeup->sleep_state, sleep_state);
 837                         wakeup->sleep_state = sleep_state;
 838                 }
 839         }
 840
 841  out:
 842         kfree(buffer.pointer);
 843         return err;
 844 }
 845
 846 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
 847 {
 848         static const struct acpi_device_id button_device_ids[] = {
 849                 {"PNP0C0C", 0},         /* Power button */
 850                 {"PNP0C0D", 0},         /* Lid */
 851                 {"PNP0C0E", 0},         /* Sleep button */
 852                 {"", 0},
 853         };
 854         struct acpi_device_wakeup *wakeup = &device->wakeup;
 855         acpi_status status;
 856
 857         wakeup->flags.notifier_present = 0;
 858
 859         /* Power button, Lid switch always enable wakeup */
 860         if (!acpi_match_device_ids(device, button_device_ids)) {
 861                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 862                         /* Do not use Lid/sleep button for S5 wakeup */
 863                         if (wakeup->sleep_state == ACPI_STATE_S5)
 864                                 wakeup->sleep_state = ACPI_STATE_S4;
 865                 }
 866                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 867                 device_set_wakeup_capable(&device->dev, true);
 868                 return true;
 869         }
 870
 871         status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 872                                          wakeup->gpe_number);
 873         return ACPI_SUCCESS(status);
 874 }
 875
 876 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 877 {
 878         int err;
 879
 880         /* Presence of _PRW indicates wake capable */
 881         if (!acpi_has_method(device->handle, "_PRW"))
 882                 return;
 883
 884         err = acpi_bus_extract_wakeup_device_power_package(device);
 885         if (err) {
 886                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
 887                 return;
 888         }
 889
 890         device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
 891         device->wakeup.prepare_count = 0;
 892         /*
 893          * Call _PSW/_DSW object to disable its ability to wake the sleeping
 894          * system for the ACPI device with the _PRW object.
 895          * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
 896          * So it is necessary to call _DSW object first. Only when it is not
 897          * present will the _PSW object used.
 898          */
 899         err = acpi_device_sleep_wake(device, 0, 0, 0);
 900         if (err)
 901                 pr_debug("error in _DSW or _PSW evaluation\n");
 902 }
 903
 904 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 905 {
 906         struct acpi_device_power_state *ps = &device->power.states[state];
 907         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 908         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 909         acpi_status status;
 910
 911         INIT_LIST_HEAD(&ps->resources);
 912
 913         /* Evaluate "_PRx" to get referenced power resources */
 914         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 915         if (ACPI_SUCCESS(status)) {
 916                 union acpi_object *package = buffer.pointer;
 917
 918                 if (buffer.length && package
 919                     && package->type == ACPI_TYPE_PACKAGE
 920                     && package->package.count)
 921                         acpi_extract_power_resources(package, 0, &ps->resources);
 922
 923                 ACPI_FREE(buffer.pointer);
 924         }
 925
 926         /* Evaluate "_PSx" to see if we can do explicit sets */
 927         pathname[2] = 'S';
 928         if (acpi_has_method(device->handle, pathname))
 929                 ps->flags.explicit_set = 1;
 930
 931         /* State is valid if there are means to put the device into it. */
 932         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
 933                 ps->flags.valid = 1;
 934
 935         ps->power = -1;         /* Unknown - driver assigned */
 936         ps->latency = -1;       /* Unknown - driver assigned */
 937 }
 938
 939 static void acpi_bus_get_power_flags(struct acpi_device *device)
 940 {
 941         u32 i;
 942
 943         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 944         if (!acpi_has_method(device->handle, "_PS0") &&
 945             !acpi_has_method(device->handle, "_PR0"))
 946                 return;
 947
 948         device->flags.power_manageable = 1;
 949
 950         /*
 951          * Power Management Flags
 952          */
 953         if (acpi_has_method(device->handle, "_PSC"))
 954                 device->power.flags.explicit_get = 1;
 955
 956         if (acpi_has_method(device->handle, "_IRC"))
 957                 device->power.flags.inrush_current = 1;
 958
 959         if (acpi_has_method(device->handle, "_DSW"))
 960                 device->power.flags.dsw_present = 1;
 961
 962         /*
 963          * Enumerate supported power management states
 964          */
 965         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
 966                 acpi_bus_init_power_state(device, i);
 967
 968         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
 969
 970         /* Set the defaults for D0 and D3hot (always supported). */
 971         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 972         device->power.states[ACPI_STATE_D0].power = 100;
 973         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
 974
 975         /*
 976          * Use power resources only if the D0 list of them is populated, because
 977          * some platforms may provide _PR3 only to indicate D3cold support and
 978          * in those cases the power resources list returned by it may be bogus.
 979          */
 980         if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
 981                 device->power.flags.power_resources = 1;
 982                 /*
 983                  * D3cold is supported if the D3hot list of power resources is
 984                  * not empty.
 985                  */
 986                 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
 987                         device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
 988         }
 989
 990         if (acpi_bus_init_power(device))
 991                 device->flags.power_manageable = 0;
 992 }
 993
 994 static void acpi_bus_get_flags(struct acpi_device *device)
 995 {
 996         /* Presence of _STA indicates 'dynamic_status' */
 997         if (acpi_has_method(device->handle, "_STA"))
 998                 device->flags.dynamic_status = 1;
 999
1000         /* Presence of _RMV indicates 'removable' */
1001         if (acpi_has_method(device->handle, "_RMV"))
1002                 device->flags.removable = 1;
1003
1004         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1005         if (acpi_has_method(device->handle, "_EJD") ||
1006             acpi_has_method(device->handle, "_EJ0"))
1007                 device->flags.ejectable = 1;
1008 }
1009
1010 static void acpi_device_get_busid(struct acpi_device *device)
1011 {
1012         char bus_id[5] = { '?', 0 };
1013         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1014         int i = 0;
1015
1016         /*
1017          * Bus ID
1018          * ------
1019          * The device's Bus ID is simply the object name.
1020          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1021          */
1022         if (ACPI_IS_ROOT_DEVICE(device)) {
1023                 strcpy(device->pnp.bus_id, "ACPI");
1024                 return;
1025         }
1026
1027         switch (device->device_type) {
1028         case ACPI_BUS_TYPE_POWER_BUTTON:
1029                 strcpy(device->pnp.bus_id, "PWRF");
1030                 break;
1031         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1032                 strcpy(device->pnp.bus_id, "SLPF");
1033                 break;
1034         case ACPI_BUS_TYPE_ECDT_EC:
1035                 strcpy(device->pnp.bus_id, "ECDT");
1036                 break;
1037         default:
1038                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1039                 /* Clean up trailing underscores (if any) */
1040                 for (i = 3; i > 1; i--) {
1041                         if (bus_id[i] == '_')
1042                                 bus_id[i] = '\0';
1043                         else
1044                                 break;
1045                 }
1046                 strcpy(device->pnp.bus_id, bus_id);
1047                 break;
1048         }
1049 }
1050
1051 /*
1052  * acpi_ata_match - see if an acpi object is an ATA device
1053  *
1054  * If an acpi object has one of the ACPI ATA methods defined,
1055  * then we can safely call it an ATA device.
1056  */
1057 bool acpi_ata_match(acpi_handle handle)
1058 {
1059         return acpi_has_method(handle, "_GTF") ||
1060                acpi_has_method(handle, "_GTM") ||
1061                acpi_has_method(handle, "_STM") ||
1062                acpi_has_method(handle, "_SDD");
1063 }
1064
1065 /*
1066  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1067  *
1068  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1069  * then we can safely call it an ejectable drive bay
1070  */
1071 bool acpi_bay_match(acpi_handle handle)
1072 {
1073         acpi_handle phandle;
1074
1075         if (!acpi_has_method(handle, "_EJ0"))
1076                 return false;
1077         if (acpi_ata_match(handle))
1078                 return true;
1079         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1080                 return false;
1081
1082         return acpi_ata_match(phandle);
1083 }
1084
1085 bool acpi_device_is_battery(struct acpi_device *adev)
1086 {
1087         struct acpi_hardware_id *hwid;
1088
1089         list_for_each_entry(hwid, &adev->pnp.ids, list)
1090                 if (!strcmp("PNP0C0A", hwid->id))
1091                         return true;
1092
1093         return false;
1094 }
1095
1096 static bool is_ejectable_bay(struct acpi_device *adev)
1097 {
1098         acpi_handle handle = adev->handle;
1099
1100         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1101                 return true;
1102
1103         return acpi_bay_match(handle);
1104 }
1105
1106 /*
1107  * acpi_dock_match - see if an acpi object has a _DCK method
1108  */
1109 bool acpi_dock_match(acpi_handle handle)
1110 {
1111         return acpi_has_method(handle, "_DCK");
1112 }
1113
1114 static acpi_status
1115 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1116                           void **return_value)
1117 {
1118         long *cap = context;
1119
1120         if (acpi_has_method(handle, "_BCM") &&
1121             acpi_has_method(handle, "_BCL")) {
1122                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1123                                   "support\n"));
1124                 *cap |= ACPI_VIDEO_BACKLIGHT;
1125                 /* We have backlight support, no need to scan further */
1126                 return AE_CTRL_TERMINATE;
1127         }
1128         return 0;
1129 }
1130
1131 /* Returns true if the ACPI object is a video device which can be
1132  * handled by video.ko.
1133  * The device will get a Linux specific CID added in scan.c to
1134  * identify the device as an ACPI graphics device
1135  * Be aware that the graphics device may not be physically present
1136  * Use acpi_video_get_capabilities() to detect general ACPI video
1137  * capabilities of present cards
1138  */
1139 long acpi_is_video_device(acpi_handle handle)
1140 {
1141         long video_caps = 0;
1142
1143         /* Is this device able to support video switching ? */
1144         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1145                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1146
1147         /* Is this device able to retrieve a video ROM ? */
1148         if (acpi_has_method(handle, "_ROM"))
1149                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1150
1151         /* Is this device able to configure which video head to be POSTed ? */
1152         if (acpi_has_method(handle, "_VPO") &&
1153             acpi_has_method(handle, "_GPD") &&
1154             acpi_has_method(handle, "_SPD"))
1155                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1156
1157         /* Only check for backlight functionality if one of the above hit. */
1158         if (video_caps)
1159                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1160                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1161                                     &video_caps, NULL);
1162
1163         return video_caps;
1164 }
1165 EXPORT_SYMBOL(acpi_is_video_device);
1166
1167 const char *acpi_device_hid(struct acpi_device *device)
1168 {
1169         struct acpi_hardware_id *hid;
1170
1171         if (list_empty(&device->pnp.ids))
1172                 return dummy_hid;
1173
1174         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1175         return hid->id;
1176 }
1177 EXPORT_SYMBOL(acpi_device_hid);
1178
1179 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1180 {
1181         struct acpi_hardware_id *id;
1182
1183         id = kmalloc(sizeof(*id), GFP_KERNEL);
1184         if (!id)
1185                 return;
1186
1187         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1188         if (!id->id) {
1189                 kfree(id);
1190                 return;
1191         }
1192
1193         list_add_tail(&id->list, &pnp->ids);
1194         pnp->type.hardware_id = 1;
1195 }
1196
1197 /*
1198  * Old IBM workstations have a DSDT bug wherein the SMBus object
1199  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1200  * prefix.  Work around this.
1201  */
1202 static bool acpi_ibm_smbus_match(acpi_handle handle)
1203 {
1204         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1205         struct acpi_buffer path = { sizeof(node_name), node_name };
1206
1207         if (!dmi_name_in_vendors("IBM"))
1208                 return false;
1209
1210         /* Look for SMBS object */
1211         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1212             strcmp("SMBS", path.pointer))
1213                 return false;
1214
1215         /* Does it have the necessary (but misnamed) methods? */
1216         if (acpi_has_method(handle, "SBI") &&
1217             acpi_has_method(handle, "SBR") &&
1218             acpi_has_method(handle, "SBW"))
1219                 return true;
1220
1221         return false;
1222 }
1223
1224 static bool acpi_object_is_system_bus(acpi_handle handle)
1225 {
1226         acpi_handle tmp;
1227
1228         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1229             tmp == handle)
1230                 return true;
1231         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1232             tmp == handle)
1233                 return true;
1234
1235         return false;
1236 }
1237
1238 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1239                                 int device_type)
1240 {
1241         acpi_status status;
1242         struct acpi_device_info *info;
1243         struct acpi_pnp_device_id_list *cid_list;
1244         int i;
1245
1246         switch (device_type) {
1247         case ACPI_BUS_TYPE_DEVICE:
1248                 if (handle == ACPI_ROOT_OBJECT) {
1249                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1250                         break;
1251                 }
1252
1253                 status = acpi_get_object_info(handle, &info);
1254                 if (ACPI_FAILURE(status)) {
1255                         pr_err(PREFIX "%s: Error reading device info\n",
1256                                         __func__);
1257                         return;
1258                 }
1259
1260                 if (info->valid & ACPI_VALID_HID) {
1261                         acpi_add_id(pnp, info->hardware_id.string);
1262                         pnp->type.platform_id = 1;
1263                 }
1264                 if (info->valid & ACPI_VALID_CID) {
1265                         cid_list = &info->compatible_id_list;
1266                         for (i = 0; i < cid_list->count; i++)
1267                                 acpi_add_id(pnp, cid_list->ids[i].string);
1268                 }
1269                 if (info->valid & ACPI_VALID_ADR) {
1270                         pnp->bus_address = info->address;
1271                         pnp->type.bus_address = 1;
1272                 }
1273                 if (info->valid & ACPI_VALID_UID)
1274                         pnp->unique_id = kstrdup(info->unique_id.string,
1275                                                         GFP_KERNEL);
1276                 if (info->valid & ACPI_VALID_CLS)
1277                         acpi_add_id(pnp, info->class_code.string);
1278
1279                 kfree(info);
1280
1281                 /*
1282                  * Some devices don't reliably have _HIDs & _CIDs, so add
1283                  * synthetic HIDs to make sure drivers can find them.
1284                  */
1285                 if (acpi_is_video_device(handle))
1286                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1287                 else if (acpi_bay_match(handle))
1288                         acpi_add_id(pnp, ACPI_BAY_HID);
1289                 else if (acpi_dock_match(handle))
1290                         acpi_add_id(pnp, ACPI_DOCK_HID);
1291                 else if (acpi_ibm_smbus_match(handle))
1292                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1293                 else if (list_empty(&pnp->ids) &&
1294                          acpi_object_is_system_bus(handle)) {
1295                         /* \_SB, \_TZ, LNXSYBUS */
1296                         acpi_add_id(pnp, ACPI_BUS_HID);
1297                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1298                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1299                 }
1300
1301                 break;
1302         case ACPI_BUS_TYPE_POWER:
1303                 acpi_add_id(pnp, ACPI_POWER_HID);
1304                 break;
1305         case ACPI_BUS_TYPE_PROCESSOR:
1306                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1307                 break;
1308         case ACPI_BUS_TYPE_THERMAL:
1309                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1310                 break;
1311         case ACPI_BUS_TYPE_POWER_BUTTON:
1312                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1313                 break;
1314         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1315                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1316                 break;
1317         case ACPI_BUS_TYPE_ECDT_EC:
1318                 acpi_add_id(pnp, ACPI_ECDT_HID);
1319                 break;
1320         }
1321 }
1322
1323 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1324 {
1325         struct acpi_hardware_id *id, *tmp;
1326
1327         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1328                 kfree_const(id->id);
1329                 kfree(id);
1330         }
1331         kfree(pnp->unique_id);
1332 }
1333
1334 /**
1335  * acpi_dma_supported - Check DMA support for the specified device.
1336  * @adev: The pointer to acpi device
1337  *
1338  * Return false if DMA is not supported. Otherwise, return true
1339  */
1340 bool acpi_dma_supported(struct acpi_device *adev)
1341 {
1342         if (!adev)
1343                 return false;
1344
1345         if (adev->flags.cca_seen)
1346                 return true;
1347
1348         /*
1349         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1350         * DMA on "Intel platforms".  Presumably that includes all x86 and
1351         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1352         */
1353         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1354                 return true;
1355
1356         return false;
1357 }
1358
1359 /**
1360  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1361  * @adev: The pointer to acpi device
1362  *
1363  * Return enum dev_dma_attr.
1364  */
1365 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1366 {
1367         if (!acpi_dma_supported(adev))
1368                 return DEV_DMA_NOT_SUPPORTED;
1369
1370         if (adev->flags.coherent_dma)
1371                 return DEV_DMA_COHERENT;
1372         else
1373                 return DEV_DMA_NON_COHERENT;
1374 }
1375
1376 /**
1377  * acpi_dma_get_range() - Get device DMA parameters.
1378  *
1379  * @dev: device to configure
1380  * @dma_addr: pointer device DMA address result
1381  * @offset: pointer to the DMA offset result
1382  * @size: pointer to DMA range size result
1383  *
1384  * Evaluate DMA regions and return respectively DMA region start, offset
1385  * and size in dma_addr, offset and size on parsing success; it does not
1386  * update the passed in values on failure.
1387  *
1388  * Return 0 on success, < 0 on failure.
1389  */
1390 int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1391                        u64 *size)
1392 {
1393         struct acpi_device *adev;
1394         LIST_HEAD(list);
1395         struct resource_entry *rentry;
1396         int ret;
1397         struct device *dma_dev = dev;
1398         u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1399
1400         /*
1401          * Walk the device tree chasing an ACPI companion with a _DMA
1402          * object while we go. Stop if we find a device with an ACPI
1403          * companion containing a _DMA method.
1404          */
1405         do {
1406                 adev = ACPI_COMPANION(dma_dev);
1407                 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1408                         break;
1409
1410                 dma_dev = dma_dev->parent;
1411         } while (dma_dev);
1412
1413         if (!dma_dev)
1414                 return -ENODEV;
1415
1416         if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1417                 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1418                 return -EINVAL;
1419         }
1420
1421         ret = acpi_dev_get_dma_resources(adev, &list);
1422         if (ret > 0) {
1423                 list_for_each_entry(rentry, &list, node) {
1424                         if (dma_offset && rentry->offset != dma_offset) {
1425                                 ret = -EINVAL;
1426                                 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1427                                 goto out;
1428                         }
1429                         dma_offset = rentry->offset;
1430
1431                         /* Take lower and upper limits */
1432                         if (rentry->res->start < dma_start)
1433                                 dma_start = rentry->res->start;
1434                         if (rentry->res->end > dma_end)
1435                                 dma_end = rentry->res->end;
1436                 }
1437
1438                 if (dma_start >= dma_end) {
1439                         ret = -EINVAL;
1440                         dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1441                         goto out;
1442                 }
1443
1444                 *dma_addr = dma_start - dma_offset;
1445                 len = dma_end - dma_start;
1446                 *size = max(len, len + 1);
1447                 *offset = dma_offset;
1448         }
1449  out:
1450         acpi_dev_free_resource_list(&list);
1451
1452         return ret >= 0 ? 0 : ret;
1453 }
1454
1455 /**
1456  * acpi_dma_configure_id - Set-up DMA configuration for the device.
1457  * @dev: The pointer to the device
1458  * @attr: device dma attributes
1459  * @input_id: input device id const value pointer
1460  */
1461 int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1462                           const u32 *input_id)
1463 {
1464         const struct iommu_ops *iommu;
1465         u64 dma_addr = 0, size = 0;
1466
1467         if (attr == DEV_DMA_NOT_SUPPORTED) {
1468                 set_dma_ops(dev, &dma_dummy_ops);
1469                 return 0;
1470         }
1471
1472         iort_dma_setup(dev, &dma_addr, &size);
1473
1474         iommu = iort_iommu_configure_id(dev, input_id);
1475         if (PTR_ERR(iommu) == -EPROBE_DEFER)
1476                 return -EPROBE_DEFER;
1477
1478         arch_setup_dma_ops(dev, dma_addr, size,
1479                                 iommu, attr == DEV_DMA_COHERENT);
1480
1481         return 0;
1482 }
1483 EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1484
1485 static void acpi_init_coherency(struct acpi_device *adev)
1486 {
1487         unsigned long long cca = 0;
1488         acpi_status status;
1489         struct acpi_device *parent = adev->parent;
1490
1491         if (parent && parent->flags.cca_seen) {
1492                 /*
1493                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1494                  * already saw one.
1495                  */
1496                 adev->flags.cca_seen = 1;
1497                 cca = parent->flags.coherent_dma;
1498         } else {
1499                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1500                                                NULL, &cca);
1501                 if (ACPI_SUCCESS(status))
1502                         adev->flags.cca_seen = 1;
1503                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1504                         /*
1505                          * If architecture does not specify that _CCA is
1506                          * required for DMA-able devices (e.g. x86),
1507                          * we default to _CCA=1.
1508                          */
1509                         cca = 1;
1510                 else
1511                         acpi_handle_debug(adev->handle,
1512                                           "ACPI device is missing _CCA.\n");
1513         }
1514
1515         adev->flags.coherent_dma = cca;
1516 }
1517
1518 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1519 {
1520         bool *is_serial_bus_slave_p = data;
1521
1522         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1523                 return 1;
1524
1525         *is_serial_bus_slave_p = true;
1526
1527          /* no need to do more checking */
1528         return -1;
1529 }
1530
1531 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1532 {
1533         struct acpi_device *parent = device->parent;
1534         static const struct acpi_device_id indirect_io_hosts[] = {
1535                 {"HISI0191", 0},
1536                 {}
1537         };
1538
1539         return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1540 }
1541
1542 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1543 {
1544         struct list_head resource_list;
1545         bool is_serial_bus_slave = false;
1546         /*
1547          * These devices have multiple I2cSerialBus resources and an i2c-client
1548          * must be instantiated for each, each with its own i2c_device_id.
1549          * Normally we only instantiate an i2c-client for the first resource,
1550          * using the ACPI HID as id. These special cases are handled by the
1551          * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
1552          * which i2c_device_id to use for each resource.
1553          */
1554         static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
1555                 {"BSG1160", },
1556                 {"BSG2150", },
1557                 {"INT33FE", },
1558                 {"INT3515", },
1559                 {}
1560         };
1561
1562         if (acpi_is_indirect_io_slave(device))
1563                 return true;
1564
1565         /* Macs use device properties in lieu of _CRS resources */
1566         if (x86_apple_machine &&
1567             (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1568              fwnode_property_present(&device->fwnode, "i2cAddress") ||
1569              fwnode_property_present(&device->fwnode, "baud")))
1570                 return true;
1571
1572         /* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */
1573         if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
1574                 return false;
1575
1576         INIT_LIST_HEAD(&resource_list);
1577         acpi_dev_get_resources(device, &resource_list,
1578                                acpi_check_serial_bus_slave,
1579                                &is_serial_bus_slave);
1580         acpi_dev_free_resource_list(&resource_list);
1581
1582         return is_serial_bus_slave;
1583 }
1584
1585 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1586                              int type, unsigned long long sta)
1587 {
1588         INIT_LIST_HEAD(&device->pnp.ids);
1589         device->device_type = type;
1590         device->handle = handle;
1591         device->parent = acpi_bus_get_parent(handle);
1592         device->fwnode.ops = &acpi_device_fwnode_ops;
1593         acpi_set_device_status(device, sta);
1594         acpi_device_get_busid(device);
1595         acpi_set_pnp_ids(handle, &device->pnp, type);
1596         acpi_init_properties(device);
1597         acpi_bus_get_flags(device);
1598         device->flags.match_driver = false;
1599         device->flags.initialized = true;
1600         device->flags.enumeration_by_parent =
1601                 acpi_device_enumeration_by_parent(device);
1602         acpi_device_clear_enumerated(device);
1603         device_initialize(&device->dev);
1604         dev_set_uevent_suppress(&device->dev, true);
1605         acpi_init_coherency(device);
1606         /* Assume there are unmet deps until acpi_device_dep_initialize() runs */
1607         device->dep_unmet = 1;
1608 }
1609
1610 void acpi_device_add_finalize(struct acpi_device *device)
1611 {
1612         dev_set_uevent_suppress(&device->dev, false);
1613         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1614 }
1615
1616 static int acpi_add_single_object(struct acpi_device **child,
1617                                   acpi_handle handle, int type,
1618                                   unsigned long long sta)
1619 {
1620         int result;
1621         struct acpi_device *device;
1622         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1623
1624         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1625         if (!device) {
1626                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1627                 return -ENOMEM;
1628         }
1629
1630         acpi_init_device_object(device, handle, type, sta);
1631         /*
1632          * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so
1633          * that we can call acpi_bus_get_status() and use its quirk handling.
1634          * Note this must be done before the get power-/wakeup_dev-flags calls.
1635          */
1636         if (type == ACPI_BUS_TYPE_DEVICE)
1637                 if (acpi_bus_get_status(device) < 0)
1638                         acpi_set_device_status(device, 0);
1639
1640         acpi_bus_get_power_flags(device);
1641         acpi_bus_get_wakeup_device_flags(device);
1642
1643         result = acpi_device_add(device, acpi_device_release);
1644         if (result) {
1645                 acpi_device_release(&device->dev);
1646                 return result;
1647         }
1648
1649         acpi_power_add_remove_device(device, true);
1650         acpi_device_add_finalize(device);
1651         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1652         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1653                 dev_name(&device->dev), (char *) buffer.pointer,
1654                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1655         kfree(buffer.pointer);
1656         *child = device;
1657         return 0;
1658 }
1659
1660 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1661                                             void *context)
1662 {
1663         struct resource *res = context;
1664
1665         if (acpi_dev_resource_memory(ares, res))
1666                 return AE_CTRL_TERMINATE;
1667
1668         return AE_OK;
1669 }
1670
1671 static bool acpi_device_should_be_hidden(acpi_handle handle)
1672 {
1673         acpi_status status;
1674         struct resource res;
1675
1676         /* Check if it should ignore the UART device */
1677         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1678                 return false;
1679
1680         /*
1681          * The UART device described in SPCR table is assumed to have only one
1682          * memory resource present. So we only look for the first one here.
1683          */
1684         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1685                                      acpi_get_resource_memory, &res);
1686         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1687                 return false;
1688
1689         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1690                          &res.start);
1691
1692         return true;
1693 }
1694
1695 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1696                                     unsigned long long *sta)
1697 {
1698         acpi_status status;
1699         acpi_object_type acpi_type;
1700
1701         status = acpi_get_type(handle, &acpi_type);
1702         if (ACPI_FAILURE(status))
1703                 return -ENODEV;
1704
1705         switch (acpi_type) {
1706         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1707         case ACPI_TYPE_DEVICE:
1708                 if (acpi_device_should_be_hidden(handle))
1709                         return -ENODEV;
1710
1711                 *type = ACPI_BUS_TYPE_DEVICE;
1712                 /*
1713                  * acpi_add_single_object updates this once we've an acpi_device
1714                  * so that acpi_bus_get_status' quirk handling can be used.
1715                  */
1716                 *sta = ACPI_STA_DEFAULT;
1717                 break;
1718         case ACPI_TYPE_PROCESSOR:
1719                 *type = ACPI_BUS_TYPE_PROCESSOR;
1720                 status = acpi_bus_get_status_handle(handle, sta);
1721                 if (ACPI_FAILURE(status))
1722                         return -ENODEV;
1723                 break;
1724         case ACPI_TYPE_THERMAL:
1725                 *type = ACPI_BUS_TYPE_THERMAL;
1726                 *sta = ACPI_STA_DEFAULT;
1727                 break;
1728         case ACPI_TYPE_POWER:
1729                 *type = ACPI_BUS_TYPE_POWER;
1730                 *sta = ACPI_STA_DEFAULT;
1731                 break;
1732         default:
1733                 return -ENODEV;
1734         }
1735
1736         return 0;
1737 }
1738
1739 bool acpi_device_is_present(const struct acpi_device *adev)
1740 {
1741         return adev->status.present || adev->status.functional;
1742 }
1743
1744 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1745                                        const char *idstr,
1746                                        const struct acpi_device_id **matchid)
1747 {
1748         const struct acpi_device_id *devid;
1749
1750         if (handler->match)
1751                 return handler->match(idstr, matchid);
1752
1753         for (devid = handler->ids; devid->id[0]; devid++)
1754                 if (!strcmp((char *)devid->id, idstr)) {
1755                         if (matchid)
1756                                 *matchid = devid;
1757
1758                         return true;
1759                 }
1760
1761         return false;
1762 }
1763
1764 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1765                                         const struct acpi_device_id **matchid)
1766 {
1767         struct acpi_scan_handler *handler;
1768
1769         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1770                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1771                         return handler;
1772
1773         return NULL;
1774 }
1775
1776 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1777 {
1778         if (!!hotplug->enabled == !!val)
1779                 return;
1780
1781         mutex_lock(&acpi_scan_lock);
1782
1783         hotplug->enabled = val;
1784
1785         mutex_unlock(&acpi_scan_lock);
1786 }
1787
1788 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1789 {
1790         struct acpi_hardware_id *hwid;
1791
1792         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1793                 acpi_dock_add(adev);
1794                 return;
1795         }
1796         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1797                 struct acpi_scan_handler *handler;
1798
1799                 handler = acpi_scan_match_handler(hwid->id, NULL);
1800                 if (handler) {
1801                         adev->flags.hotplug_notify = true;
1802                         break;
1803                 }
1804         }
1805 }
1806
1807 static void acpi_device_dep_initialize(struct acpi_device *adev)
1808 {
1809         struct acpi_dep_data *dep;
1810         struct acpi_handle_list dep_devices;
1811         acpi_status status;
1812         int i;
1813
1814         adev->dep_unmet = 0;
1815
1816         if (!acpi_has_method(adev->handle, "_DEP"))
1817                 return;
1818
1819         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1820                                         &dep_devices);
1821         if (ACPI_FAILURE(status)) {
1822                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1823                 return;
1824         }
1825
1826         for (i = 0; i < dep_devices.count; i++) {
1827                 struct acpi_device_info *info;
1828                 int skip;
1829
1830                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1831                 if (ACPI_FAILURE(status)) {
1832                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1833                         continue;
1834                 }
1835
1836                 /*
1837                  * Skip the dependency of Windows System Power
1838                  * Management Controller
1839                  */
1840                 skip = info->valid & ACPI_VALID_HID &&
1841                         !strcmp(info->hardware_id.string, "INT3396");
1842
1843                 kfree(info);
1844
1845                 if (skip)
1846                         continue;
1847
1848                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1849                 if (!dep)
1850                         return;
1851
1852                 dep->master = dep_devices.handles[i];
1853                 dep->slave  = adev->handle;
1854                 adev->dep_unmet++;
1855
1856                 mutex_lock(&acpi_dep_list_lock);
1857                 list_add_tail(&dep->node , &acpi_dep_list);
1858                 mutex_unlock(&acpi_dep_list_lock);
1859         }
1860 }
1861
1862 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1863                                       void *not_used, void **return_value)
1864 {
1865         struct acpi_device *device = NULL;
1866         int type;
1867         unsigned long long sta;
1868         int result;
1869
1870         acpi_bus_get_device(handle, &device);
1871         if (device)
1872                 goto out;
1873
1874         result = acpi_bus_type_and_status(handle, &type, &sta);
1875         if (result)
1876                 return AE_OK;
1877
1878         if (type == ACPI_BUS_TYPE_POWER) {
1879                 acpi_add_power_resource(handle);
1880                 return AE_OK;
1881         }
1882
1883         acpi_add_single_object(&device, handle, type, sta);
1884         if (!device)
1885                 return AE_CTRL_DEPTH;
1886
1887         acpi_scan_init_hotplug(device);
1888         acpi_device_dep_initialize(device);
1889
1890  out:
1891         if (!*return_value)
1892                 *return_value = device;
1893
1894         return AE_OK;
1895 }
1896
1897 static void acpi_default_enumeration(struct acpi_device *device)
1898 {
1899         /*
1900          * Do not enumerate devices with enumeration_by_parent flag set as
1901          * they will be enumerated by their respective parents.
1902          */
1903         if (!device->flags.enumeration_by_parent) {
1904                 acpi_create_platform_device(device, NULL);
1905                 acpi_device_set_enumerated(device);
1906         } else {
1907                 blocking_notifier_call_chain(&acpi_reconfig_chain,
1908                                              ACPI_RECONFIG_DEVICE_ADD, device);
1909         }
1910 }
1911
1912 static const struct acpi_device_id generic_device_ids[] = {
1913         {ACPI_DT_NAMESPACE_HID, },
1914         {"", },
1915 };
1916
1917 static int acpi_generic_device_attach(struct acpi_device *adev,
1918                                       const struct acpi_device_id *not_used)
1919 {
1920         /*
1921          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1922          * below can be unconditional.
1923          */
1924         if (adev->data.of_compatible)
1925                 acpi_default_enumeration(adev);
1926
1927         return 1;
1928 }
1929
1930 static struct acpi_scan_handler generic_device_handler = {
1931         .ids = generic_device_ids,
1932         .attach = acpi_generic_device_attach,
1933 };
1934
1935 static int acpi_scan_attach_handler(struct acpi_device *device)
1936 {
1937         struct acpi_hardware_id *hwid;
1938         int ret = 0;
1939
1940         list_for_each_entry(hwid, &device->pnp.ids, list) {
1941                 const struct acpi_device_id *devid;
1942                 struct acpi_scan_handler *handler;
1943
1944                 handler = acpi_scan_match_handler(hwid->id, &devid);
1945                 if (handler) {
1946                         if (!handler->attach) {
1947                                 device->pnp.type.platform_id = 0;
1948                                 continue;
1949                         }
1950                         device->handler = handler;
1951                         ret = handler->attach(device, devid);
1952                         if (ret > 0)
1953                                 break;
1954
1955                         device->handler = NULL;
1956                         if (ret < 0)
1957                                 break;
1958                 }
1959         }
1960
1961         return ret;
1962 }
1963
1964 static void acpi_bus_attach(struct acpi_device *device)
1965 {
1966         struct acpi_device *child;
1967         acpi_handle ejd;
1968         int ret;
1969
1970         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1971                 register_dock_dependent_device(device, ejd);
1972
1973         acpi_bus_get_status(device);
1974         /* Skip devices that are not present. */
1975         if (!acpi_device_is_present(device)) {
1976                 device->flags.initialized = false;
1977                 acpi_device_clear_enumerated(device);
1978                 device->flags.power_manageable = 0;
1979                 return;
1980         }
1981         if (device->handler)
1982                 goto ok;
1983
1984         if (!device->flags.initialized) {
1985                 device->flags.power_manageable =
1986                         device->power.states[ACPI_STATE_D0].flags.valid;
1987                 if (acpi_bus_init_power(device))
1988                         device->flags.power_manageable = 0;
1989
1990                 device->flags.initialized = true;
1991         } else if (device->flags.visited) {
1992                 goto ok;
1993         }
1994
1995         ret = acpi_scan_attach_handler(device);
1996         if (ret < 0)
1997                 return;
1998
1999         device->flags.match_driver = true;
2000         if (ret > 0 && !device->flags.enumeration_by_parent) {
2001                 acpi_device_set_enumerated(device);
2002                 goto ok;
2003         }
2004
2005         ret = device_attach(&device->dev);
2006         if (ret < 0)
2007                 return;
2008
2009         if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2010                 acpi_default_enumeration(device);
2011         else
2012                 acpi_device_set_enumerated(device);
2013
2014  ok:
2015         list_for_each_entry(child, &device->children, node)
2016                 acpi_bus_attach(child);
2017
2018         if (device->handler && device->handler->hotplug.notify_online)
2019                 device->handler->hotplug.notify_online(device);
2020 }
2021
2022 void acpi_walk_dep_device_list(acpi_handle handle)
2023 {
2024         struct acpi_dep_data *dep, *tmp;
2025         struct acpi_device *adev;
2026
2027         mutex_lock(&acpi_dep_list_lock);
2028         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2029                 if (dep->master == handle) {
2030                         acpi_bus_get_device(dep->slave, &adev);
2031                         if (!adev)
2032                                 continue;
2033
2034                         adev->dep_unmet--;
2035                         if (!adev->dep_unmet)
2036                                 acpi_bus_attach(adev);
2037                         list_del(&dep->node);
2038                         kfree(dep);
2039                 }
2040         }
2041         mutex_unlock(&acpi_dep_list_lock);
2042 }
2043 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2044
2045 /**
2046  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2047  * @handle: Root of the namespace scope to scan.
2048  *
2049  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2050  * found devices.
2051  *
2052  * If no devices were found, -ENODEV is returned, but it does not mean that
2053  * there has been a real error.  There just have been no suitable ACPI objects
2054  * in the table trunk from which the kernel could create a device and add an
2055  * appropriate driver.
2056  *
2057  * Must be called under acpi_scan_lock.
2058  */
2059 int acpi_bus_scan(acpi_handle handle)
2060 {
2061         void *device = NULL;
2062
2063         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2064                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2065                                     acpi_bus_check_add, NULL, NULL, &device);
2066
2067         if (device) {
2068                 acpi_bus_attach(device);
2069                 return 0;
2070         }
2071         return -ENODEV;
2072 }
2073 EXPORT_SYMBOL(acpi_bus_scan);
2074
2075 /**
2076  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2077  * @adev: Root of the ACPI namespace scope to walk.
2078  *
2079  * Must be called under acpi_scan_lock.
2080  */
2081 void acpi_bus_trim(struct acpi_device *adev)
2082 {
2083         struct acpi_scan_handler *handler = adev->handler;
2084         struct acpi_device *child;
2085
2086         list_for_each_entry_reverse(child, &adev->children, node)
2087                 acpi_bus_trim(child);
2088
2089         adev->flags.match_driver = false;
2090         if (handler) {
2091                 if (handler->detach)
2092                         handler->detach(adev);
2093
2094                 adev->handler = NULL;
2095         } else {
2096                 device_release_driver(&adev->dev);
2097         }
2098         /*
2099          * Most likely, the device is going away, so put it into D3cold before
2100          * that.
2101          */
2102         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2103         adev->flags.initialized = false;
2104         acpi_device_clear_enumerated(adev);
2105 }
2106 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2107
2108 int acpi_bus_register_early_device(int type)
2109 {
2110         struct acpi_device *device = NULL;
2111         int result;
2112
2113         result = acpi_add_single_object(&device, NULL,
2114                                         type, ACPI_STA_DEFAULT);
2115         if (result)
2116                 return result;
2117
2118         device->flags.match_driver = true;
2119         return device_attach(&device->dev);
2120 }
2121 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2122
2123 static int acpi_bus_scan_fixed(void)
2124 {
2125         int result = 0;
2126
2127         /*
2128          * Enumerate all fixed-feature devices.
2129          */
2130         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2131                 struct acpi_device *device = NULL;
2132
2133                 result = acpi_add_single_object(&device, NULL,
2134                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2135                                                 ACPI_STA_DEFAULT);
2136                 if (result)
2137                         return result;
2138
2139                 device->flags.match_driver = true;
2140                 result = device_attach(&device->dev);
2141                 if (result < 0)
2142                         return result;
2143
2144                 device_init_wakeup(&device->dev, true);
2145         }
2146
2147         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2148                 struct acpi_device *device = NULL;
2149
2150                 result = acpi_add_single_object(&device, NULL,
2151                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2152                                                 ACPI_STA_DEFAULT);
2153                 if (result)
2154                         return result;
2155
2156                 device->flags.match_driver = true;
2157                 result = device_attach(&device->dev);
2158         }
2159
2160         return result < 0 ? result : 0;
2161 }
2162
2163 static void __init acpi_get_spcr_uart_addr(void)
2164 {
2165         acpi_status status;
2166         struct acpi_table_spcr *spcr_ptr;
2167
2168         status = acpi_get_table(ACPI_SIG_SPCR, 0,
2169                                 (struct acpi_table_header **)&spcr_ptr);
2170         if (ACPI_FAILURE(status)) {
2171                 pr_warn(PREFIX "STAO table present, but SPCR is missing\n");
2172                 return;
2173         }
2174
2175         spcr_uart_addr = spcr_ptr->serial_port.address;
2176         acpi_put_table((struct acpi_table_header *)spcr_ptr);
2177 }
2178
2179 static bool acpi_scan_initialized;
2180
2181 int __init acpi_scan_init(void)
2182 {
2183         int result;
2184         acpi_status status;
2185         struct acpi_table_stao *stao_ptr;
2186
2187         acpi_pci_root_init();
2188         acpi_pci_link_init();
2189         acpi_processor_init();
2190         acpi_platform_init();
2191         acpi_lpss_init();
2192         acpi_apd_init();
2193         acpi_cmos_rtc_init();
2194         acpi_container_init();
2195         acpi_memory_hotplug_init();
2196         acpi_watchdog_init();
2197         acpi_pnp_init();
2198         acpi_int340x_thermal_init();
2199         acpi_amba_init();
2200         acpi_init_lpit();
2201
2202         acpi_scan_add_handler(&generic_device_handler);
2203
2204         /*
2205          * If there is STAO table, check whether it needs to ignore the UART
2206          * device in SPCR table.
2207          */
2208         status = acpi_get_table(ACPI_SIG_STAO, 0,
2209                                 (struct acpi_table_header **)&stao_ptr);
2210         if (ACPI_SUCCESS(status)) {
2211                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2212                         pr_info(PREFIX "STAO Name List not yet supported.\n");
2213
2214                 if (stao_ptr->ignore_uart)
2215                         acpi_get_spcr_uart_addr();
2216
2217                 acpi_put_table((struct acpi_table_header *)stao_ptr);
2218         }
2219
2220         acpi_gpe_apply_masked_gpes();
2221         acpi_update_all_gpes();
2222
2223         /*
2224          * Although we call __add_memory() that is documented to require the
2225          * device_hotplug_lock, it is not necessary here because this is an
2226          * early code when userspace or any other code path cannot trigger
2227          * hotplug/hotunplug operations.
2228          */
2229         mutex_lock(&acpi_scan_lock);
2230         /*
2231          * Enumerate devices in the ACPI namespace.
2232          */
2233         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2234         if (result)
2235                 goto out;
2236
2237         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2238         if (result)
2239                 goto out;
2240
2241         /* Fixed feature devices do not exist on HW-reduced platform */
2242         if (!acpi_gbl_reduced_hardware) {
2243                 result = acpi_bus_scan_fixed();
2244                 if (result) {
2245                         acpi_detach_data(acpi_root->handle,
2246                                          acpi_scan_drop_device);
2247                         acpi_device_del(acpi_root);
2248                         put_device(&acpi_root->dev);
2249                         goto out;
2250                 }
2251         }
2252
2253         acpi_scan_initialized = true;
2254
2255  out:
2256         mutex_unlock(&acpi_scan_lock);
2257         return result;
2258 }
2259
2260 static struct acpi_probe_entry *ape;
2261 static int acpi_probe_count;
2262 static DEFINE_MUTEX(acpi_probe_mutex);
2263
2264 static int __init acpi_match_madt(union acpi_subtable_headers *header,
2265                                   const unsigned long end)
2266 {
2267         if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2268                 if (!ape->probe_subtbl(header, end))
2269                         acpi_probe_count++;
2270
2271         return 0;
2272 }
2273
2274 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2275 {
2276         int count = 0;
2277
2278         if (acpi_disabled)
2279                 return 0;
2280
2281         mutex_lock(&acpi_probe_mutex);
2282         for (ape = ap_head; nr; ape++, nr--) {
2283                 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2284                         acpi_probe_count = 0;
2285                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2286                         count += acpi_probe_count;
2287                 } else {
2288                         int res;
2289                         res = acpi_table_parse(ape->id, ape->probe_table);
2290                         if (!res)
2291                                 count++;
2292                 }
2293         }
2294         mutex_unlock(&acpi_probe_mutex);
2295
2296         return count;
2297 }
2298
2299 struct acpi_table_events_work {
2300         struct work_struct work;
2301         void *table;
2302         u32 event;
2303 };
2304
2305 static void acpi_table_events_fn(struct work_struct *work)
2306 {
2307         struct acpi_table_events_work *tew;
2308
2309         tew = container_of(work, struct acpi_table_events_work, work);
2310
2311         if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2312                 acpi_scan_lock_acquire();
2313                 acpi_bus_scan(ACPI_ROOT_OBJECT);
2314                 acpi_scan_lock_release();
2315         }
2316
2317         kfree(tew);
2318 }
2319
2320 void acpi_scan_table_handler(u32 event, void *table, void *context)
2321 {
2322         struct acpi_table_events_work *tew;
2323
2324         if (!acpi_scan_initialized)
2325                 return;
2326
2327         if (event != ACPI_TABLE_EVENT_LOAD)
2328                 return;
2329
2330         tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2331         if (!tew)
2332                 return;
2333
2334         INIT_WORK(&tew->work, acpi_table_events_fn);
2335         tew->table = table;
2336         tew->event = event;
2337
2338         schedule_work(&tew->work);
2339 }
2340
2341 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2342 {
2343         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2344 }
2345 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2346
2347 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2348 {
2349         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2350 }
2351 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);