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-mapping.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                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 902                                 "error in _DSW or _PSW evaluation\n"));
 903 }
 904
 905 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 906 {
 907         struct acpi_device_power_state *ps = &device->power.states[state];
 908         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 909         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 910         acpi_status status;
 911
 912         INIT_LIST_HEAD(&ps->resources);
 913
 914         /* Evaluate "_PRx" to get referenced power resources */
 915         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 916         if (ACPI_SUCCESS(status)) {
 917                 union acpi_object *package = buffer.pointer;
 918
 919                 if (buffer.length && package
 920                     && package->type == ACPI_TYPE_PACKAGE
 921                     && package->package.count)
 922                         acpi_extract_power_resources(package, 0, &ps->resources);
 923
 924                 ACPI_FREE(buffer.pointer);
 925         }
 926
 927         /* Evaluate "_PSx" to see if we can do explicit sets */
 928         pathname[2] = 'S';
 929         if (acpi_has_method(device->handle, pathname))
 930                 ps->flags.explicit_set = 1;
 931
 932         /* State is valid if there are means to put the device into it. */
 933         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
 934                 ps->flags.valid = 1;
 935
 936         ps->power = -1;         /* Unknown - driver assigned */
 937         ps->latency = -1;       /* Unknown - driver assigned */
 938 }
 939
 940 static void acpi_bus_get_power_flags(struct acpi_device *device)
 941 {
 942         u32 i;
 943
 944         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 945         if (!acpi_has_method(device->handle, "_PS0") &&
 946             !acpi_has_method(device->handle, "_PR0"))
 947                 return;
 948
 949         device->flags.power_manageable = 1;
 950
 951         /*
 952          * Power Management Flags
 953          */
 954         if (acpi_has_method(device->handle, "_PSC"))
 955                 device->power.flags.explicit_get = 1;
 956
 957         if (acpi_has_method(device->handle, "_IRC"))
 958                 device->power.flags.inrush_current = 1;
 959
 960         if (acpi_has_method(device->handle, "_DSW"))
 961                 device->power.flags.dsw_present = 1;
 962
 963         /*
 964          * Enumerate supported power management states
 965          */
 966         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
 967                 acpi_bus_init_power_state(device, i);
 968
 969         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
 970
 971         /* Set the defaults for D0 and D3hot (always supported). */
 972         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 973         device->power.states[ACPI_STATE_D0].power = 100;
 974         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
 975
 976         /*
 977          * Use power resources only if the D0 list of them is populated, because
 978          * some platforms may provide _PR3 only to indicate D3cold support and
 979          * in those cases the power resources list returned by it may be bogus.
 980          */
 981         if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
 982                 device->power.flags.power_resources = 1;
 983                 /*
 984                  * D3cold is supported if the D3hot list of power resources is
 985                  * not empty.
 986                  */
 987                 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
 988                         device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
 989         }
 990
 991         if (acpi_bus_init_power(device))
 992                 device->flags.power_manageable = 0;
 993 }
 994
 995 static void acpi_bus_get_flags(struct acpi_device *device)
 996 {
 997         /* Presence of _STA indicates 'dynamic_status' */
 998         if (acpi_has_method(device->handle, "_STA"))
 999                 device->flags.dynamic_status = 1;
1000
1001         /* Presence of _RMV indicates 'removable' */
1002         if (acpi_has_method(device->handle, "_RMV"))
1003                 device->flags.removable = 1;
1004
1005         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1006         if (acpi_has_method(device->handle, "_EJD") ||
1007             acpi_has_method(device->handle, "_EJ0"))
1008                 device->flags.ejectable = 1;
1009 }
1010
1011 static void acpi_device_get_busid(struct acpi_device *device)
1012 {
1013         char bus_id[5] = { '?', 0 };
1014         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1015         int i = 0;
1016
1017         /*
1018          * Bus ID
1019          * ------
1020          * The device's Bus ID is simply the object name.
1021          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1022          */
1023         if (ACPI_IS_ROOT_DEVICE(device)) {
1024                 strcpy(device->pnp.bus_id, "ACPI");
1025                 return;
1026         }
1027
1028         switch (device->device_type) {
1029         case ACPI_BUS_TYPE_POWER_BUTTON:
1030                 strcpy(device->pnp.bus_id, "PWRF");
1031                 break;
1032         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1033                 strcpy(device->pnp.bus_id, "SLPF");
1034                 break;
1035         case ACPI_BUS_TYPE_ECDT_EC:
1036                 strcpy(device->pnp.bus_id, "ECDT");
1037                 break;
1038         default:
1039                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1040                 /* Clean up trailing underscores (if any) */
1041                 for (i = 3; i > 1; i--) {
1042                         if (bus_id[i] == '_')
1043                                 bus_id[i] = '\0';
1044                         else
1045                                 break;
1046                 }
1047                 strcpy(device->pnp.bus_id, bus_id);
1048                 break;
1049         }
1050 }
1051
1052 /*
1053  * acpi_ata_match - see if an acpi object is an ATA device
1054  *
1055  * If an acpi object has one of the ACPI ATA methods defined,
1056  * then we can safely call it an ATA device.
1057  */
1058 bool acpi_ata_match(acpi_handle handle)
1059 {
1060         return acpi_has_method(handle, "_GTF") ||
1061                acpi_has_method(handle, "_GTM") ||
1062                acpi_has_method(handle, "_STM") ||
1063                acpi_has_method(handle, "_SDD");
1064 }
1065
1066 /*
1067  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1068  *
1069  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1070  * then we can safely call it an ejectable drive bay
1071  */
1072 bool acpi_bay_match(acpi_handle handle)
1073 {
1074         acpi_handle phandle;
1075
1076         if (!acpi_has_method(handle, "_EJ0"))
1077                 return false;
1078         if (acpi_ata_match(handle))
1079                 return true;
1080         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1081                 return false;
1082
1083         return acpi_ata_match(phandle);
1084 }
1085
1086 bool acpi_device_is_battery(struct acpi_device *adev)
1087 {
1088         struct acpi_hardware_id *hwid;
1089
1090         list_for_each_entry(hwid, &adev->pnp.ids, list)
1091                 if (!strcmp("PNP0C0A", hwid->id))
1092                         return true;
1093
1094         return false;
1095 }
1096
1097 static bool is_ejectable_bay(struct acpi_device *adev)
1098 {
1099         acpi_handle handle = adev->handle;
1100
1101         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1102                 return true;
1103
1104         return acpi_bay_match(handle);
1105 }
1106
1107 /*
1108  * acpi_dock_match - see if an acpi object has a _DCK method
1109  */
1110 bool acpi_dock_match(acpi_handle handle)
1111 {
1112         return acpi_has_method(handle, "_DCK");
1113 }
1114
1115 static acpi_status
1116 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1117                           void **return_value)
1118 {
1119         long *cap = context;
1120
1121         if (acpi_has_method(handle, "_BCM") &&
1122             acpi_has_method(handle, "_BCL")) {
1123                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1124                                   "support\n"));
1125                 *cap |= ACPI_VIDEO_BACKLIGHT;
1126                 /* We have backlight support, no need to scan further */
1127                 return AE_CTRL_TERMINATE;
1128         }
1129         return 0;
1130 }
1131
1132 /* Returns true if the ACPI object is a video device which can be
1133  * handled by video.ko.
1134  * The device will get a Linux specific CID added in scan.c to
1135  * identify the device as an ACPI graphics device
1136  * Be aware that the graphics device may not be physically present
1137  * Use acpi_video_get_capabilities() to detect general ACPI video
1138  * capabilities of present cards
1139  */
1140 long acpi_is_video_device(acpi_handle handle)
1141 {
1142         long video_caps = 0;
1143
1144         /* Is this device able to support video switching ? */
1145         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1146                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1147
1148         /* Is this device able to retrieve a video ROM ? */
1149         if (acpi_has_method(handle, "_ROM"))
1150                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1151
1152         /* Is this device able to configure which video head to be POSTed ? */
1153         if (acpi_has_method(handle, "_VPO") &&
1154             acpi_has_method(handle, "_GPD") &&
1155             acpi_has_method(handle, "_SPD"))
1156                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1157
1158         /* Only check for backlight functionality if one of the above hit. */
1159         if (video_caps)
1160                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1161                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1162                                     &video_caps, NULL);
1163
1164         return video_caps;
1165 }
1166 EXPORT_SYMBOL(acpi_is_video_device);
1167
1168 const char *acpi_device_hid(struct acpi_device *device)
1169 {
1170         struct acpi_hardware_id *hid;
1171
1172         if (list_empty(&device->pnp.ids))
1173                 return dummy_hid;
1174
1175         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1176         return hid->id;
1177 }
1178 EXPORT_SYMBOL(acpi_device_hid);
1179
1180 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1181 {
1182         struct acpi_hardware_id *id;
1183
1184         id = kmalloc(sizeof(*id), GFP_KERNEL);
1185         if (!id)
1186                 return;
1187
1188         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1189         if (!id->id) {
1190                 kfree(id);
1191                 return;
1192         }
1193
1194         list_add_tail(&id->list, &pnp->ids);
1195         pnp->type.hardware_id = 1;
1196 }
1197
1198 /*
1199  * Old IBM workstations have a DSDT bug wherein the SMBus object
1200  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1201  * prefix.  Work around this.
1202  */
1203 static bool acpi_ibm_smbus_match(acpi_handle handle)
1204 {
1205         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1206         struct acpi_buffer path = { sizeof(node_name), node_name };
1207
1208         if (!dmi_name_in_vendors("IBM"))
1209                 return false;
1210
1211         /* Look for SMBS object */
1212         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1213             strcmp("SMBS", path.pointer))
1214                 return false;
1215
1216         /* Does it have the necessary (but misnamed) methods? */
1217         if (acpi_has_method(handle, "SBI") &&
1218             acpi_has_method(handle, "SBR") &&
1219             acpi_has_method(handle, "SBW"))
1220                 return true;
1221
1222         return false;
1223 }
1224
1225 static bool acpi_object_is_system_bus(acpi_handle handle)
1226 {
1227         acpi_handle tmp;
1228
1229         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1230             tmp == handle)
1231                 return true;
1232         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1233             tmp == handle)
1234                 return true;
1235
1236         return false;
1237 }
1238
1239 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1240                                 int device_type)
1241 {
1242         acpi_status status;
1243         struct acpi_device_info *info;
1244         struct acpi_pnp_device_id_list *cid_list;
1245         int i;
1246
1247         switch (device_type) {
1248         case ACPI_BUS_TYPE_DEVICE:
1249                 if (handle == ACPI_ROOT_OBJECT) {
1250                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1251                         break;
1252                 }
1253
1254                 status = acpi_get_object_info(handle, &info);
1255                 if (ACPI_FAILURE(status)) {
1256                         pr_err(PREFIX "%s: Error reading device info\n",
1257                                         __func__);
1258                         return;
1259                 }
1260
1261                 if (info->valid & ACPI_VALID_HID) {
1262                         acpi_add_id(pnp, info->hardware_id.string);
1263                         pnp->type.platform_id = 1;
1264                 }
1265                 if (info->valid & ACPI_VALID_CID) {
1266                         cid_list = &info->compatible_id_list;
1267                         for (i = 0; i < cid_list->count; i++)
1268                                 acpi_add_id(pnp, cid_list->ids[i].string);
1269                 }
1270                 if (info->valid & ACPI_VALID_ADR) {
1271                         pnp->bus_address = info->address;
1272                         pnp->type.bus_address = 1;
1273                 }
1274                 if (info->valid & ACPI_VALID_UID)
1275                         pnp->unique_id = kstrdup(info->unique_id.string,
1276                                                         GFP_KERNEL);
1277                 if (info->valid & ACPI_VALID_CLS)
1278                         acpi_add_id(pnp, info->class_code.string);
1279
1280                 kfree(info);
1281
1282                 /*
1283                  * Some devices don't reliably have _HIDs & _CIDs, so add
1284                  * synthetic HIDs to make sure drivers can find them.
1285                  */
1286                 if (acpi_is_video_device(handle))
1287                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1288                 else if (acpi_bay_match(handle))
1289                         acpi_add_id(pnp, ACPI_BAY_HID);
1290                 else if (acpi_dock_match(handle))
1291                         acpi_add_id(pnp, ACPI_DOCK_HID);
1292                 else if (acpi_ibm_smbus_match(handle))
1293                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1294                 else if (list_empty(&pnp->ids) &&
1295                          acpi_object_is_system_bus(handle)) {
1296                         /* \_SB, \_TZ, LNXSYBUS */
1297                         acpi_add_id(pnp, ACPI_BUS_HID);
1298                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1299                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1300                 }
1301
1302                 break;
1303         case ACPI_BUS_TYPE_POWER:
1304                 acpi_add_id(pnp, ACPI_POWER_HID);
1305                 break;
1306         case ACPI_BUS_TYPE_PROCESSOR:
1307                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1308                 break;
1309         case ACPI_BUS_TYPE_THERMAL:
1310                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1311                 break;
1312         case ACPI_BUS_TYPE_POWER_BUTTON:
1313                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1314                 break;
1315         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1316                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1317                 break;
1318         case ACPI_BUS_TYPE_ECDT_EC:
1319                 acpi_add_id(pnp, ACPI_ECDT_HID);
1320                 break;
1321         }
1322 }
1323
1324 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1325 {
1326         struct acpi_hardware_id *id, *tmp;
1327
1328         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1329                 kfree_const(id->id);
1330                 kfree(id);
1331         }
1332         kfree(pnp->unique_id);
1333 }
1334
1335 /**
1336  * acpi_dma_supported - Check DMA support for the specified device.
1337  * @adev: The pointer to acpi device
1338  *
1339  * Return false if DMA is not supported. Otherwise, return true
1340  */
1341 bool acpi_dma_supported(struct acpi_device *adev)
1342 {
1343         if (!adev)
1344                 return false;
1345
1346         if (adev->flags.cca_seen)
1347                 return true;
1348
1349         /*
1350         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1351         * DMA on "Intel platforms".  Presumably that includes all x86 and
1352         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1353         */
1354         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1355                 return true;
1356
1357         return false;
1358 }
1359
1360 /**
1361  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1362  * @adev: The pointer to acpi device
1363  *
1364  * Return enum dev_dma_attr.
1365  */
1366 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1367 {
1368         if (!acpi_dma_supported(adev))
1369                 return DEV_DMA_NOT_SUPPORTED;
1370
1371         if (adev->flags.coherent_dma)
1372                 return DEV_DMA_COHERENT;
1373         else
1374                 return DEV_DMA_NON_COHERENT;
1375 }
1376
1377 /**
1378  * acpi_dma_get_range() - Get device DMA parameters.
1379  *
1380  * @dev: device to configure
1381  * @dma_addr: pointer device DMA address result
1382  * @offset: pointer to the DMA offset result
1383  * @size: pointer to DMA range size result
1384  *
1385  * Evaluate DMA regions and return respectively DMA region start, offset
1386  * and size in dma_addr, offset and size on parsing success; it does not
1387  * update the passed in values on failure.
1388  *
1389  * Return 0 on success, < 0 on failure.
1390  */
1391 int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1392                        u64 *size)
1393 {
1394         struct acpi_device *adev;
1395         LIST_HEAD(list);
1396         struct resource_entry *rentry;
1397         int ret;
1398         struct device *dma_dev = dev;
1399         u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1400
1401         /*
1402          * Walk the device tree chasing an ACPI companion with a _DMA
1403          * object while we go. Stop if we find a device with an ACPI
1404          * companion containing a _DMA method.
1405          */
1406         do {
1407                 adev = ACPI_COMPANION(dma_dev);
1408                 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1409                         break;
1410
1411                 dma_dev = dma_dev->parent;
1412         } while (dma_dev);
1413
1414         if (!dma_dev)
1415                 return -ENODEV;
1416
1417         if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1418                 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1419                 return -EINVAL;
1420         }
1421
1422         ret = acpi_dev_get_dma_resources(adev, &list);
1423         if (ret > 0) {
1424                 list_for_each_entry(rentry, &list, node) {
1425                         if (dma_offset && rentry->offset != dma_offset) {
1426                                 ret = -EINVAL;
1427                                 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1428                                 goto out;
1429                         }
1430                         dma_offset = rentry->offset;
1431
1432                         /* Take lower and upper limits */
1433                         if (rentry->res->start < dma_start)
1434                                 dma_start = rentry->res->start;
1435                         if (rentry->res->end > dma_end)
1436                                 dma_end = rentry->res->end;
1437                 }
1438
1439                 if (dma_start >= dma_end) {
1440                         ret = -EINVAL;
1441                         dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1442                         goto out;
1443                 }
1444
1445                 *dma_addr = dma_start - dma_offset;
1446                 len = dma_end - dma_start;
1447                 *size = max(len, len + 1);
1448                 *offset = dma_offset;
1449         }
1450  out:
1451         acpi_dev_free_resource_list(&list);
1452
1453         return ret >= 0 ? 0 : ret;
1454 }
1455
1456 /**
1457  * acpi_dma_configure - Set-up DMA configuration for the device.
1458  * @dev: The pointer to the device
1459  * @attr: device dma attributes
1460  * @input_id: input device id const value pointer
1461  */
1462 int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1463                           const u32 *input_id)
1464 {
1465         const struct iommu_ops *iommu;
1466         u64 dma_addr = 0, size = 0;
1467
1468         if (attr == DEV_DMA_NOT_SUPPORTED) {
1469                 set_dma_ops(dev, &dma_dummy_ops);
1470                 return 0;
1471         }
1472
1473         iort_dma_setup(dev, &dma_addr, &size);
1474
1475         iommu = iort_iommu_configure_id(dev, input_id);
1476         if (PTR_ERR(iommu) == -EPROBE_DEFER)
1477                 return -EPROBE_DEFER;
1478
1479         arch_setup_dma_ops(dev, dma_addr, size,
1480                                 iommu, attr == DEV_DMA_COHERENT);
1481
1482         return 0;
1483 }
1484 EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1485
1486 static void acpi_init_coherency(struct acpi_device *adev)
1487 {
1488         unsigned long long cca = 0;
1489         acpi_status status;
1490         struct acpi_device *parent = adev->parent;
1491
1492         if (parent && parent->flags.cca_seen) {
1493                 /*
1494                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1495                  * already saw one.
1496                  */
1497                 adev->flags.cca_seen = 1;
1498                 cca = parent->flags.coherent_dma;
1499         } else {
1500                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1501                                                NULL, &cca);
1502                 if (ACPI_SUCCESS(status))
1503                         adev->flags.cca_seen = 1;
1504                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1505                         /*
1506                          * If architecture does not specify that _CCA is
1507                          * required for DMA-able devices (e.g. x86),
1508                          * we default to _CCA=1.
1509                          */
1510                         cca = 1;
1511                 else
1512                         acpi_handle_debug(adev->handle,
1513                                           "ACPI device is missing _CCA.\n");
1514         }
1515
1516         adev->flags.coherent_dma = cca;
1517 }
1518
1519 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1520 {
1521         bool *is_serial_bus_slave_p = data;
1522
1523         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1524                 return 1;
1525
1526         *is_serial_bus_slave_p = true;
1527
1528          /* no need to do more checking */
1529         return -1;
1530 }
1531
1532 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1533 {
1534         struct acpi_device *parent = device->parent;
1535         static const struct acpi_device_id indirect_io_hosts[] = {
1536                 {"HISI0191", 0},
1537                 {}
1538         };
1539
1540         return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1541 }
1542
1543 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1544 {
1545         struct list_head resource_list;
1546         bool is_serial_bus_slave = false;
1547         /*
1548          * These devices have multiple I2cSerialBus resources and an i2c-client
1549          * must be instantiated for each, each with its own i2c_device_id.
1550          * Normally we only instantiate an i2c-client for the first resource,
1551          * using the ACPI HID as id. These special cases are handled by the
1552          * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
1553          * which i2c_device_id to use for each resource.
1554          */
1555         static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
1556                 {"BSG1160", },
1557                 {"BSG2150", },
1558                 {"INT33FE", },
1559                 {"INT3515", },
1560                 {}
1561         };
1562
1563         if (acpi_is_indirect_io_slave(device))
1564                 return true;
1565
1566         /* Macs use device properties in lieu of _CRS resources */
1567         if (x86_apple_machine &&
1568             (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1569              fwnode_property_present(&device->fwnode, "i2cAddress") ||
1570              fwnode_property_present(&device->fwnode, "baud")))
1571                 return true;
1572
1573         /* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */
1574         if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
1575                 return false;
1576
1577         INIT_LIST_HEAD(&resource_list);
1578         acpi_dev_get_resources(device, &resource_list,
1579                                acpi_check_serial_bus_slave,
1580                                &is_serial_bus_slave);
1581         acpi_dev_free_resource_list(&resource_list);
1582
1583         return is_serial_bus_slave;
1584 }
1585
1586 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1587                              int type, unsigned long long sta)
1588 {
1589         INIT_LIST_HEAD(&device->pnp.ids);
1590         device->device_type = type;
1591         device->handle = handle;
1592         device->parent = acpi_bus_get_parent(handle);
1593         device->fwnode.ops = &acpi_device_fwnode_ops;
1594         acpi_set_device_status(device, sta);
1595         acpi_device_get_busid(device);
1596         acpi_set_pnp_ids(handle, &device->pnp, type);
1597         acpi_init_properties(device);
1598         acpi_bus_get_flags(device);
1599         device->flags.match_driver = false;
1600         device->flags.initialized = true;
1601         device->flags.enumeration_by_parent =
1602                 acpi_device_enumeration_by_parent(device);
1603         acpi_device_clear_enumerated(device);
1604         device_initialize(&device->dev);
1605         dev_set_uevent_suppress(&device->dev, true);
1606         acpi_init_coherency(device);
1607         /* Assume there are unmet deps until acpi_device_dep_initialize() runs */
1608         device->dep_unmet = 1;
1609 }
1610
1611 void acpi_device_add_finalize(struct acpi_device *device)
1612 {
1613         dev_set_uevent_suppress(&device->dev, false);
1614         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1615 }
1616
1617 static int acpi_add_single_object(struct acpi_device **child,
1618                                   acpi_handle handle, int type,
1619                                   unsigned long long sta)
1620 {
1621         int result;
1622         struct acpi_device *device;
1623         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1624
1625         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1626         if (!device) {
1627                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1628                 return -ENOMEM;
1629         }
1630
1631         acpi_init_device_object(device, handle, type, sta);
1632         /*
1633          * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so
1634          * that we can call acpi_bus_get_status() and use its quirk handling.
1635          * Note this must be done before the get power-/wakeup_dev-flags calls.
1636          */
1637         if (type == ACPI_BUS_TYPE_DEVICE)
1638                 if (acpi_bus_get_status(device) < 0)
1639                         acpi_set_device_status(device, 0);
1640
1641         acpi_bus_get_power_flags(device);
1642         acpi_bus_get_wakeup_device_flags(device);
1643
1644         result = acpi_device_add(device, acpi_device_release);
1645         if (result) {
1646                 acpi_device_release(&device->dev);
1647                 return result;
1648         }
1649
1650         acpi_power_add_remove_device(device, true);
1651         acpi_device_add_finalize(device);
1652         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1653         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1654                 dev_name(&device->dev), (char *) buffer.pointer,
1655                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1656         kfree(buffer.pointer);
1657         *child = device;
1658         return 0;
1659 }
1660
1661 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1662                                             void *context)
1663 {
1664         struct resource *res = context;
1665
1666         if (acpi_dev_resource_memory(ares, res))
1667                 return AE_CTRL_TERMINATE;
1668
1669         return AE_OK;
1670 }
1671
1672 static bool acpi_device_should_be_hidden(acpi_handle handle)
1673 {
1674         acpi_status status;
1675         struct resource res;
1676
1677         /* Check if it should ignore the UART device */
1678         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1679                 return false;
1680
1681         /*
1682          * The UART device described in SPCR table is assumed to have only one
1683          * memory resource present. So we only look for the first one here.
1684          */
1685         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1686                                      acpi_get_resource_memory, &res);
1687         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1688                 return false;
1689
1690         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1691                          &res.start);
1692
1693         return true;
1694 }
1695
1696 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1697                                     unsigned long long *sta)
1698 {
1699         acpi_status status;
1700         acpi_object_type acpi_type;
1701
1702         status = acpi_get_type(handle, &acpi_type);
1703         if (ACPI_FAILURE(status))
1704                 return -ENODEV;
1705
1706         switch (acpi_type) {
1707         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1708         case ACPI_TYPE_DEVICE:
1709                 if (acpi_device_should_be_hidden(handle))
1710                         return -ENODEV;
1711
1712                 *type = ACPI_BUS_TYPE_DEVICE;
1713                 /*
1714                  * acpi_add_single_object updates this once we've an acpi_device
1715                  * so that acpi_bus_get_status' quirk handling can be used.
1716                  */
1717                 *sta = ACPI_STA_DEFAULT;
1718                 break;
1719         case ACPI_TYPE_PROCESSOR:
1720                 *type = ACPI_BUS_TYPE_PROCESSOR;
1721                 status = acpi_bus_get_status_handle(handle, sta);
1722                 if (ACPI_FAILURE(status))
1723                         return -ENODEV;
1724                 break;
1725         case ACPI_TYPE_THERMAL:
1726                 *type = ACPI_BUS_TYPE_THERMAL;
1727                 *sta = ACPI_STA_DEFAULT;
1728                 break;
1729         case ACPI_TYPE_POWER:
1730                 *type = ACPI_BUS_TYPE_POWER;
1731                 *sta = ACPI_STA_DEFAULT;
1732                 break;
1733         default:
1734                 return -ENODEV;
1735         }
1736
1737         return 0;
1738 }
1739
1740 bool acpi_device_is_present(const struct acpi_device *adev)
1741 {
1742         return adev->status.present || adev->status.functional;
1743 }
1744
1745 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1746                                        const char *idstr,
1747                                        const struct acpi_device_id **matchid)
1748 {
1749         const struct acpi_device_id *devid;
1750
1751         if (handler->match)
1752                 return handler->match(idstr, matchid);
1753
1754         for (devid = handler->ids; devid->id[0]; devid++)
1755                 if (!strcmp((char *)devid->id, idstr)) {
1756                         if (matchid)
1757                                 *matchid = devid;
1758
1759                         return true;
1760                 }
1761
1762         return false;
1763 }
1764
1765 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1766                                         const struct acpi_device_id **matchid)
1767 {
1768         struct acpi_scan_handler *handler;
1769
1770         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1771                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1772                         return handler;
1773
1774         return NULL;
1775 }
1776
1777 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1778 {
1779         if (!!hotplug->enabled == !!val)
1780                 return;
1781
1782         mutex_lock(&acpi_scan_lock);
1783
1784         hotplug->enabled = val;
1785
1786         mutex_unlock(&acpi_scan_lock);
1787 }
1788
1789 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1790 {
1791         struct acpi_hardware_id *hwid;
1792
1793         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1794                 acpi_dock_add(adev);
1795                 return;
1796         }
1797         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1798                 struct acpi_scan_handler *handler;
1799
1800                 handler = acpi_scan_match_handler(hwid->id, NULL);
1801                 if (handler) {
1802                         adev->flags.hotplug_notify = true;
1803                         break;
1804                 }
1805         }
1806 }
1807
1808 static void acpi_device_dep_initialize(struct acpi_device *adev)
1809 {
1810         struct acpi_dep_data *dep;
1811         struct acpi_handle_list dep_devices;
1812         acpi_status status;
1813         int i;
1814
1815         adev->dep_unmet = 0;
1816
1817         if (!acpi_has_method(adev->handle, "_DEP"))
1818                 return;
1819
1820         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1821                                         &dep_devices);
1822         if (ACPI_FAILURE(status)) {
1823                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1824                 return;
1825         }
1826
1827         for (i = 0; i < dep_devices.count; i++) {
1828                 struct acpi_device_info *info;
1829                 int skip;
1830
1831                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1832                 if (ACPI_FAILURE(status)) {
1833                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1834                         continue;
1835                 }
1836
1837                 /*
1838                  * Skip the dependency of Windows System Power
1839                  * Management Controller
1840                  */
1841                 skip = info->valid & ACPI_VALID_HID &&
1842                         !strcmp(info->hardware_id.string, "INT3396");
1843
1844                 kfree(info);
1845
1846                 if (skip)
1847                         continue;
1848
1849                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1850                 if (!dep)
1851                         return;
1852
1853                 dep->master = dep_devices.handles[i];
1854                 dep->slave  = adev->handle;
1855                 adev->dep_unmet++;
1856
1857                 mutex_lock(&acpi_dep_list_lock);
1858                 list_add_tail(&dep->node , &acpi_dep_list);
1859                 mutex_unlock(&acpi_dep_list_lock);
1860         }
1861 }
1862
1863 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1864                                       void *not_used, void **return_value)
1865 {
1866         struct acpi_device *device = NULL;
1867         int type;
1868         unsigned long long sta;
1869         int result;
1870
1871         acpi_bus_get_device(handle, &device);
1872         if (device)
1873                 goto out;
1874
1875         result = acpi_bus_type_and_status(handle, &type, &sta);
1876         if (result)
1877                 return AE_OK;
1878
1879         if (type == ACPI_BUS_TYPE_POWER) {
1880                 acpi_add_power_resource(handle);
1881                 return AE_OK;
1882         }
1883
1884         acpi_add_single_object(&device, handle, type, sta);
1885         if (!device)
1886                 return AE_CTRL_DEPTH;
1887
1888         acpi_scan_init_hotplug(device);
1889         acpi_device_dep_initialize(device);
1890
1891  out:
1892         if (!*return_value)
1893                 *return_value = device;
1894
1895         return AE_OK;
1896 }
1897
1898 static void acpi_default_enumeration(struct acpi_device *device)
1899 {
1900         /*
1901          * Do not enumerate devices with enumeration_by_parent flag set as
1902          * they will be enumerated by their respective parents.
1903          */
1904         if (!device->flags.enumeration_by_parent) {
1905                 acpi_create_platform_device(device, NULL);
1906                 acpi_device_set_enumerated(device);
1907         } else {
1908                 blocking_notifier_call_chain(&acpi_reconfig_chain,
1909                                              ACPI_RECONFIG_DEVICE_ADD, device);
1910         }
1911 }
1912
1913 static const struct acpi_device_id generic_device_ids[] = {
1914         {ACPI_DT_NAMESPACE_HID, },
1915         {"", },
1916 };
1917
1918 static int acpi_generic_device_attach(struct acpi_device *adev,
1919                                       const struct acpi_device_id *not_used)
1920 {
1921         /*
1922          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1923          * below can be unconditional.
1924          */
1925         if (adev->data.of_compatible)
1926                 acpi_default_enumeration(adev);
1927
1928         return 1;
1929 }
1930
1931 static struct acpi_scan_handler generic_device_handler = {
1932         .ids = generic_device_ids,
1933         .attach = acpi_generic_device_attach,
1934 };
1935
1936 static int acpi_scan_attach_handler(struct acpi_device *device)
1937 {
1938         struct acpi_hardware_id *hwid;
1939         int ret = 0;
1940
1941         list_for_each_entry(hwid, &device->pnp.ids, list) {
1942                 const struct acpi_device_id *devid;
1943                 struct acpi_scan_handler *handler;
1944
1945                 handler = acpi_scan_match_handler(hwid->id, &devid);
1946                 if (handler) {
1947                         if (!handler->attach) {
1948                                 device->pnp.type.platform_id = 0;
1949                                 continue;
1950                         }
1951                         device->handler = handler;
1952                         ret = handler->attach(device, devid);
1953                         if (ret > 0)
1954                                 break;
1955
1956                         device->handler = NULL;
1957                         if (ret < 0)
1958                                 break;
1959                 }
1960         }
1961
1962         return ret;
1963 }
1964
1965 static void acpi_bus_attach(struct acpi_device *device)
1966 {
1967         struct acpi_device *child;
1968         acpi_handle ejd;
1969         int ret;
1970
1971         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1972                 register_dock_dependent_device(device, ejd);
1973
1974         acpi_bus_get_status(device);
1975         /* Skip devices that are not present. */
1976         if (!acpi_device_is_present(device)) {
1977                 device->flags.initialized = false;
1978                 acpi_device_clear_enumerated(device);
1979                 device->flags.power_manageable = 0;
1980                 return;
1981         }
1982         if (device->handler)
1983                 goto ok;
1984
1985         if (!device->flags.initialized) {
1986                 device->flags.power_manageable =
1987                         device->power.states[ACPI_STATE_D0].flags.valid;
1988                 if (acpi_bus_init_power(device))
1989                         device->flags.power_manageable = 0;
1990
1991                 device->flags.initialized = true;
1992         } else if (device->flags.visited) {
1993                 goto ok;
1994         }
1995
1996         ret = acpi_scan_attach_handler(device);
1997         if (ret < 0)
1998                 return;
1999
2000         device->flags.match_driver = true;
2001         if (ret > 0 && !device->flags.enumeration_by_parent) {
2002                 acpi_device_set_enumerated(device);
2003                 goto ok;
2004         }
2005
2006         ret = device_attach(&device->dev);
2007         if (ret < 0)
2008                 return;
2009
2010         if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2011                 acpi_default_enumeration(device);
2012         else
2013                 acpi_device_set_enumerated(device);
2014
2015  ok:
2016         list_for_each_entry(child, &device->children, node)
2017                 acpi_bus_attach(child);
2018
2019         if (device->handler && device->handler->hotplug.notify_online)
2020                 device->handler->hotplug.notify_online(device);
2021 }
2022
2023 void acpi_walk_dep_device_list(acpi_handle handle)
2024 {
2025         struct acpi_dep_data *dep, *tmp;
2026         struct acpi_device *adev;
2027
2028         mutex_lock(&acpi_dep_list_lock);
2029         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2030                 if (dep->master == handle) {
2031                         acpi_bus_get_device(dep->slave, &adev);
2032                         if (!adev)
2033                                 continue;
2034
2035                         adev->dep_unmet--;
2036                         if (!adev->dep_unmet)
2037                                 acpi_bus_attach(adev);
2038                         list_del(&dep->node);
2039                         kfree(dep);
2040                 }
2041         }
2042         mutex_unlock(&acpi_dep_list_lock);
2043 }
2044 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2045
2046 /**
2047  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2048  * @handle: Root of the namespace scope to scan.
2049  *
2050  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2051  * found devices.
2052  *
2053  * If no devices were found, -ENODEV is returned, but it does not mean that
2054  * there has been a real error.  There just have been no suitable ACPI objects
2055  * in the table trunk from which the kernel could create a device and add an
2056  * appropriate driver.
2057  *
2058  * Must be called under acpi_scan_lock.
2059  */
2060 int acpi_bus_scan(acpi_handle handle)
2061 {
2062         void *device = NULL;
2063
2064         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2065                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2066                                     acpi_bus_check_add, NULL, NULL, &device);
2067
2068         if (device) {
2069                 acpi_bus_attach(device);
2070                 return 0;
2071         }
2072         return -ENODEV;
2073 }
2074 EXPORT_SYMBOL(acpi_bus_scan);
2075
2076 /**
2077  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2078  * @adev: Root of the ACPI namespace scope to walk.
2079  *
2080  * Must be called under acpi_scan_lock.
2081  */
2082 void acpi_bus_trim(struct acpi_device *adev)
2083 {
2084         struct acpi_scan_handler *handler = adev->handler;
2085         struct acpi_device *child;
2086
2087         list_for_each_entry_reverse(child, &adev->children, node)
2088                 acpi_bus_trim(child);
2089
2090         adev->flags.match_driver = false;
2091         if (handler) {
2092                 if (handler->detach)
2093                         handler->detach(adev);
2094
2095                 adev->handler = NULL;
2096         } else {
2097                 device_release_driver(&adev->dev);
2098         }
2099         /*
2100          * Most likely, the device is going away, so put it into D3cold before
2101          * that.
2102          */
2103         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2104         adev->flags.initialized = false;
2105         acpi_device_clear_enumerated(adev);
2106 }
2107 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2108
2109 int acpi_bus_register_early_device(int type)
2110 {
2111         struct acpi_device *device = NULL;
2112         int result;
2113
2114         result = acpi_add_single_object(&device, NULL,
2115                                         type, ACPI_STA_DEFAULT);
2116         if (result)
2117                 return result;
2118
2119         device->flags.match_driver = true;
2120         return device_attach(&device->dev);
2121 }
2122 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2123
2124 static int acpi_bus_scan_fixed(void)
2125 {
2126         int result = 0;
2127
2128         /*
2129          * Enumerate all fixed-feature devices.
2130          */
2131         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2132                 struct acpi_device *device = NULL;
2133
2134                 result = acpi_add_single_object(&device, NULL,
2135                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2136                                                 ACPI_STA_DEFAULT);
2137                 if (result)
2138                         return result;
2139
2140                 device->flags.match_driver = true;
2141                 result = device_attach(&device->dev);
2142                 if (result < 0)
2143                         return result;
2144
2145                 device_init_wakeup(&device->dev, true);
2146         }
2147
2148         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2149                 struct acpi_device *device = NULL;
2150
2151                 result = acpi_add_single_object(&device, NULL,
2152                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2153                                                 ACPI_STA_DEFAULT);
2154                 if (result)
2155                         return result;
2156
2157                 device->flags.match_driver = true;
2158                 result = device_attach(&device->dev);
2159         }
2160
2161         return result < 0 ? result : 0;
2162 }
2163
2164 static void __init acpi_get_spcr_uart_addr(void)
2165 {
2166         acpi_status status;
2167         struct acpi_table_spcr *spcr_ptr;
2168
2169         status = acpi_get_table(ACPI_SIG_SPCR, 0,
2170                                 (struct acpi_table_header **)&spcr_ptr);
2171         if (ACPI_FAILURE(status)) {
2172                 pr_warn(PREFIX "STAO table present, but SPCR is missing\n");
2173                 return;
2174         }
2175
2176         spcr_uart_addr = spcr_ptr->serial_port.address;
2177         acpi_put_table((struct acpi_table_header *)spcr_ptr);
2178 }
2179
2180 static bool acpi_scan_initialized;
2181
2182 int __init acpi_scan_init(void)
2183 {
2184         int result;
2185         acpi_status status;
2186         struct acpi_table_stao *stao_ptr;
2187
2188         acpi_pci_root_init();
2189         acpi_pci_link_init();
2190         acpi_processor_init();
2191         acpi_platform_init();
2192         acpi_lpss_init();
2193         acpi_apd_init();
2194         acpi_cmos_rtc_init();
2195         acpi_container_init();
2196         acpi_memory_hotplug_init();
2197         acpi_watchdog_init();
2198         acpi_pnp_init();
2199         acpi_int340x_thermal_init();
2200         acpi_amba_init();
2201         acpi_init_lpit();
2202
2203         acpi_scan_add_handler(&generic_device_handler);
2204
2205         /*
2206          * If there is STAO table, check whether it needs to ignore the UART
2207          * device in SPCR table.
2208          */
2209         status = acpi_get_table(ACPI_SIG_STAO, 0,
2210                                 (struct acpi_table_header **)&stao_ptr);
2211         if (ACPI_SUCCESS(status)) {
2212                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2213                         pr_info(PREFIX "STAO Name List not yet supported.\n");
2214
2215                 if (stao_ptr->ignore_uart)
2216                         acpi_get_spcr_uart_addr();
2217
2218                 acpi_put_table((struct acpi_table_header *)stao_ptr);
2219         }
2220
2221         acpi_gpe_apply_masked_gpes();
2222         acpi_update_all_gpes();
2223
2224         /*
2225          * Although we call __add_memory() that is documented to require the
2226          * device_hotplug_lock, it is not necessary here because this is an
2227          * early code when userspace or any other code path cannot trigger
2228          * hotplug/hotunplug operations.
2229          */
2230         mutex_lock(&acpi_scan_lock);
2231         /*
2232          * Enumerate devices in the ACPI namespace.
2233          */
2234         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2235         if (result)
2236                 goto out;
2237
2238         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2239         if (result)
2240                 goto out;
2241
2242         /* Fixed feature devices do not exist on HW-reduced platform */
2243         if (!acpi_gbl_reduced_hardware) {
2244                 result = acpi_bus_scan_fixed();
2245                 if (result) {
2246                         acpi_detach_data(acpi_root->handle,
2247                                          acpi_scan_drop_device);
2248                         acpi_device_del(acpi_root);
2249                         put_device(&acpi_root->dev);
2250                         goto out;
2251                 }
2252         }
2253
2254         acpi_scan_initialized = true;
2255
2256  out:
2257         mutex_unlock(&acpi_scan_lock);
2258         return result;
2259 }
2260
2261 static struct acpi_probe_entry *ape;
2262 static int acpi_probe_count;
2263 static DEFINE_MUTEX(acpi_probe_mutex);
2264
2265 static int __init acpi_match_madt(union acpi_subtable_headers *header,
2266                                   const unsigned long end)
2267 {
2268         if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2269                 if (!ape->probe_subtbl(header, end))
2270                         acpi_probe_count++;
2271
2272         return 0;
2273 }
2274
2275 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2276 {
2277         int count = 0;
2278
2279         if (acpi_disabled)
2280                 return 0;
2281
2282         mutex_lock(&acpi_probe_mutex);
2283         for (ape = ap_head; nr; ape++, nr--) {
2284                 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2285                         acpi_probe_count = 0;
2286                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2287                         count += acpi_probe_count;
2288                 } else {
2289                         int res;
2290                         res = acpi_table_parse(ape->id, ape->probe_table);
2291                         if (!res)
2292                                 count++;
2293                 }
2294         }
2295         mutex_unlock(&acpi_probe_mutex);
2296
2297         return count;
2298 }
2299
2300 struct acpi_table_events_work {
2301         struct work_struct work;
2302         void *table;
2303         u32 event;
2304 };
2305
2306 static void acpi_table_events_fn(struct work_struct *work)
2307 {
2308         struct acpi_table_events_work *tew;
2309
2310         tew = container_of(work, struct acpi_table_events_work, work);
2311
2312         if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2313                 acpi_scan_lock_acquire();
2314                 acpi_bus_scan(ACPI_ROOT_OBJECT);
2315                 acpi_scan_lock_release();
2316         }
2317
2318         kfree(tew);
2319 }
2320
2321 void acpi_scan_table_handler(u32 event, void *table, void *context)
2322 {
2323         struct acpi_table_events_work *tew;
2324
2325         if (!acpi_scan_initialized)
2326                 return;
2327
2328         if (event != ACPI_TABLE_EVENT_LOAD)
2329                 return;
2330
2331         tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2332         if (!tew)
2333                 return;
2334
2335         INIT_WORK(&tew->work, acpi_table_events_fn);
2336         tew->table = table;
2337         tew->event = event;
2338
2339         schedule_work(&tew->work);
2340 }
2341
2342 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2343 {
2344         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2345 }
2346 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2347
2348 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2349 {
2350         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2351 }
2352 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);