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 supplier;
  55         acpi_handle consumer;
  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_const(acpi_device_bus_id->bus_id);
 490                                 kfree(acpi_device_bus_id);
 491                         }
 492                         break;
 493                 }
 494
 495         list_del(&device->wakeup_list);
 496         mutex_unlock(&acpi_device_lock);
 497
 498         acpi_power_add_remove_device(device, false);
 499         acpi_device_remove_files(device);
 500         if (device->remove)
 501                 device->remove(device);
 502
 503         device_del(&device->dev);
 504 }
 505
 506 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
 507
 508 static LIST_HEAD(acpi_device_del_list);
 509 static DEFINE_MUTEX(acpi_device_del_lock);
 510
 511 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 512 {
 513         for (;;) {
 514                 struct acpi_device *adev;
 515
 516                 mutex_lock(&acpi_device_del_lock);
 517
 518                 if (list_empty(&acpi_device_del_list)) {
 519                         mutex_unlock(&acpi_device_del_lock);
 520                         break;
 521                 }
 522                 adev = list_first_entry(&acpi_device_del_list,
 523                                         struct acpi_device, del_list);
 524                 list_del(&adev->del_list);
 525
 526                 mutex_unlock(&acpi_device_del_lock);
 527
 528                 blocking_notifier_call_chain(&acpi_reconfig_chain,
 529                                              ACPI_RECONFIG_DEVICE_REMOVE, adev);
 530
 531                 acpi_device_del(adev);
 532                 /*
 533                  * Drop references to all power resources that might have been
 534                  * used by the device.
 535                  */
 536                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
 537                 put_device(&adev->dev);
 538         }
 539 }
 540
 541 /**
 542  * acpi_scan_drop_device - Drop an ACPI device object.
 543  * @handle: Handle of an ACPI namespace node, not used.
 544  * @context: Address of the ACPI device object to drop.
 545  *
 546  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
 547  * namespace node the device object pointed to by @context is attached to.
 548  *
 549  * The unregistration is carried out asynchronously to avoid running
 550  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
 551  * ensure the correct ordering (the device objects must be unregistered in the
 552  * same order in which the corresponding namespace nodes are deleted).
 553  */
 554 static void acpi_scan_drop_device(acpi_handle handle, void *context)
 555 {
 556         static DECLARE_WORK(work, acpi_device_del_work_fn);
 557         struct acpi_device *adev = context;
 558
 559         mutex_lock(&acpi_device_del_lock);
 560
 561         /*
 562          * Use the ACPI hotplug workqueue which is ordered, so this work item
 563          * won't run after any hotplug work items submitted subsequently.  That
 564          * prevents attempts to register device objects identical to those being
 565          * deleted from happening concurrently (such attempts result from
 566          * hotplug events handled via the ACPI hotplug workqueue).  It also will
 567          * run after all of the work items submitted previosuly, which helps
 568          * those work items to ensure that they are not accessing stale device
 569          * objects.
 570          */
 571         if (list_empty(&acpi_device_del_list))
 572                 acpi_queue_hotplug_work(&work);
 573
 574         list_add_tail(&adev->del_list, &acpi_device_del_list);
 575         /* Make acpi_ns_validate_handle() return NULL for this handle. */
 576         adev->handle = INVALID_ACPI_HANDLE;
 577
 578         mutex_unlock(&acpi_device_del_lock);
 579 }
 580
 581 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
 582                                 void (*callback)(void *))
 583 {
 584         acpi_status status;
 585
 586         if (!device)
 587                 return -EINVAL;
 588
 589         *device = NULL;
 590
 591         status = acpi_get_data_full(handle, acpi_scan_drop_device,
 592                                     (void **)device, callback);
 593         if (ACPI_FAILURE(status) || !*device) {
 594                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 595                                   handle));
 596                 return -ENODEV;
 597         }
 598         return 0;
 599 }
 600
 601 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 602 {
 603         return acpi_get_device_data(handle, device, NULL);
 604 }
 605 EXPORT_SYMBOL(acpi_bus_get_device);
 606
 607 static void get_acpi_device(void *dev)
 608 {
 609         if (dev)
 610                 get_device(&((struct acpi_device *)dev)->dev);
 611 }
 612
 613 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 614 {
 615         struct acpi_device *adev = NULL;
 616
 617         acpi_get_device_data(handle, &adev, get_acpi_device);
 618         return adev;
 619 }
 620
 621 void acpi_bus_put_acpi_device(struct acpi_device *adev)
 622 {
 623         put_device(&adev->dev);
 624 }
 625
 626 int acpi_device_add(struct acpi_device *device,
 627                     void (*release)(struct device *))
 628 {
 629         int result;
 630         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 631         int found = 0;
 632
 633         if (device->handle) {
 634                 acpi_status status;
 635
 636                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
 637                                           device);
 638                 if (ACPI_FAILURE(status)) {
 639                         acpi_handle_err(device->handle,
 640                                         "Unable to attach device data\n");
 641                         return -ENODEV;
 642                 }
 643         }
 644
 645         /*
 646          * Linkage
 647          * -------
 648          * Link this device to its parent and siblings.
 649          */
 650         INIT_LIST_HEAD(&device->children);
 651         INIT_LIST_HEAD(&device->node);
 652         INIT_LIST_HEAD(&device->wakeup_list);
 653         INIT_LIST_HEAD(&device->physical_node_list);
 654         INIT_LIST_HEAD(&device->del_list);
 655         mutex_init(&device->physical_node_lock);
 656
 657         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 658         if (!new_bus_id) {
 659                 pr_err(PREFIX "Memory allocation error\n");
 660                 result = -ENOMEM;
 661                 goto err_detach;
 662         }
 663
 664         mutex_lock(&acpi_device_lock);
 665         /*
 666          * Find suitable bus_id and instance number in acpi_bus_id_list
 667          * If failed, create one and link it into acpi_bus_id_list
 668          */
 669         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 670                 if (!strcmp(acpi_device_bus_id->bus_id,
 671                             acpi_device_hid(device))) {
 672                         acpi_device_bus_id->instance_no++;
 673                         found = 1;
 674                         kfree(new_bus_id);
 675                         break;
 676                 }
 677         }
 678         if (!found) {
 679                 acpi_device_bus_id = new_bus_id;
 680                 acpi_device_bus_id->bus_id =
 681                         kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
 682                 if (!acpi_device_bus_id->bus_id) {
 683                         pr_err(PREFIX "Memory allocation error for bus id\n");
 684                         result = -ENOMEM;
 685                         goto err_free_new_bus_id;
 686                 }
 687
 688                 acpi_device_bus_id->instance_no = 0;
 689                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 690         }
 691         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 692
 693         if (device->parent)
 694                 list_add_tail(&device->node, &device->parent->children);
 695
 696         if (device->wakeup.flags.valid)
 697                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 698         mutex_unlock(&acpi_device_lock);
 699
 700         if (device->parent)
 701                 device->dev.parent = &device->parent->dev;
 702         device->dev.bus = &acpi_bus_type;
 703         device->dev.release = release;
 704         result = device_add(&device->dev);
 705         if (result) {
 706                 dev_err(&device->dev, "Error registering device\n");
 707                 goto err;
 708         }
 709
 710         result = acpi_device_setup_files(device);
 711         if (result)
 712                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 713                        dev_name(&device->dev));
 714
 715         return 0;
 716
 717  err:
 718         mutex_lock(&acpi_device_lock);
 719         if (device->parent)
 720                 list_del(&device->node);
 721         list_del(&device->wakeup_list);
 722
 723  err_free_new_bus_id:
 724         if (!found)
 725                 kfree(new_bus_id);
 726
 727         mutex_unlock(&acpi_device_lock);
 728
 729  err_detach:
 730         acpi_detach_data(device->handle, acpi_scan_drop_device);
 731         return result;
 732 }
 733
 734 /* --------------------------------------------------------------------------
 735                                  Device Enumeration
 736    -------------------------------------------------------------------------- */
 737 static bool acpi_info_matches_ids(struct acpi_device_info *info,
 738                                   const char * const ids[])
 739 {
 740         struct acpi_pnp_device_id_list *cid_list = NULL;
 741         int i;
 742
 743         if (!(info->valid & ACPI_VALID_HID))
 744                 return false;
 745
 746         if (info->valid & ACPI_VALID_CID)
 747                 cid_list = &info->compatible_id_list;
 748
 749         for (i = 0; ids[i]; i++) {
 750                 int j;
 751
 752                 if (!strcmp(info->hardware_id.string, ids[i]))
 753                         return true;
 754
 755                 if (!cid_list)
 756                         continue;
 757
 758                 for (j = 0; j < cid_list->count; j++) {
 759                         if (!strcmp(cid_list->ids[j].string, ids[i]))
 760                                 return true;
 761                 }
 762         }
 763
 764         return false;
 765 }
 766
 767 /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
 768 static const char * const acpi_ignore_dep_ids[] = {
 769         "PNP0D80", /* Windows-compatible System Power Management Controller */
 770         "INT33BD", /* Intel Baytrail Mailbox Device */
 771         NULL
 772 };
 773
 774 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 775 {
 776         struct acpi_device *device = NULL;
 777         acpi_status status;
 778
 779         /*
 780          * Fixed hardware devices do not appear in the namespace and do not
 781          * have handles, but we fabricate acpi_devices for them, so we have
 782          * to deal with them specially.
 783          */
 784         if (!handle)
 785                 return acpi_root;
 786
 787         do {
 788                 status = acpi_get_parent(handle, &handle);
 789                 if (ACPI_FAILURE(status))
 790                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 791         } while (acpi_bus_get_device(handle, &device));
 792         return device;
 793 }
 794
 795 acpi_status
 796 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 797 {
 798         acpi_status status;
 799         acpi_handle tmp;
 800         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 801         union acpi_object *obj;
 802
 803         status = acpi_get_handle(handle, "_EJD", &tmp);
 804         if (ACPI_FAILURE(status))
 805                 return status;
 806
 807         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 808         if (ACPI_SUCCESS(status)) {
 809                 obj = buffer.pointer;
 810                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 811                                          ejd);
 812                 kfree(buffer.pointer);
 813         }
 814         return status;
 815 }
 816 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 817
 818 static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
 819 {
 820         acpi_handle handle = dev->handle;
 821         struct acpi_device_wakeup *wakeup = &dev->wakeup;
 822         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 823         union acpi_object *package = NULL;
 824         union acpi_object *element = NULL;
 825         acpi_status status;
 826         int err = -ENODATA;
 827
 828         INIT_LIST_HEAD(&wakeup->resources);
 829
 830         /* _PRW */
 831         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 832         if (ACPI_FAILURE(status)) {
 833                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 834                 return err;
 835         }
 836
 837         package = (union acpi_object *)buffer.pointer;
 838
 839         if (!package || package->package.count < 2)
 840                 goto out;
 841
 842         element = &(package->package.elements[0]);
 843         if (!element)
 844                 goto out;
 845
 846         if (element->type == ACPI_TYPE_PACKAGE) {
 847                 if ((element->package.count < 2) ||
 848                     (element->package.elements[0].type !=
 849                      ACPI_TYPE_LOCAL_REFERENCE)
 850                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 851                         goto out;
 852
 853                 wakeup->gpe_device =
 854                     element->package.elements[0].reference.handle;
 855                 wakeup->gpe_number =
 856                     (u32) element->package.elements[1].integer.value;
 857         } else if (element->type == ACPI_TYPE_INTEGER) {
 858                 wakeup->gpe_device = NULL;
 859                 wakeup->gpe_number = element->integer.value;
 860         } else {
 861                 goto out;
 862         }
 863
 864         element = &(package->package.elements[1]);
 865         if (element->type != ACPI_TYPE_INTEGER)
 866                 goto out;
 867
 868         wakeup->sleep_state = element->integer.value;
 869
 870         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 871         if (err)
 872                 goto out;
 873
 874         if (!list_empty(&wakeup->resources)) {
 875                 int sleep_state;
 876
 877                 err = acpi_power_wakeup_list_init(&wakeup->resources,
 878                                                   &sleep_state);
 879                 if (err) {
 880                         acpi_handle_warn(handle, "Retrieving current states "
 881                                          "of wakeup power resources failed\n");
 882                         acpi_power_resources_list_free(&wakeup->resources);
 883                         goto out;
 884                 }
 885                 if (sleep_state < wakeup->sleep_state) {
 886                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
 887                                          "(S%d) by S%d from power resources\n",
 888                                          (int)wakeup->sleep_state, sleep_state);
 889                         wakeup->sleep_state = sleep_state;
 890                 }
 891         }
 892
 893  out:
 894         kfree(buffer.pointer);
 895         return err;
 896 }
 897
 898 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
 899 {
 900         static const struct acpi_device_id button_device_ids[] = {
 901                 {"PNP0C0C", 0},         /* Power button */
 902                 {"PNP0C0D", 0},         /* Lid */
 903                 {"PNP0C0E", 0},         /* Sleep button */
 904                 {"", 0},
 905         };
 906         struct acpi_device_wakeup *wakeup = &device->wakeup;
 907         acpi_status status;
 908
 909         wakeup->flags.notifier_present = 0;
 910
 911         /* Power button, Lid switch always enable wakeup */
 912         if (!acpi_match_device_ids(device, button_device_ids)) {
 913                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 914                         /* Do not use Lid/sleep button for S5 wakeup */
 915                         if (wakeup->sleep_state == ACPI_STATE_S5)
 916                                 wakeup->sleep_state = ACPI_STATE_S4;
 917                 }
 918                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 919                 device_set_wakeup_capable(&device->dev, true);
 920                 return true;
 921         }
 922
 923         status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 924                                          wakeup->gpe_number);
 925         return ACPI_SUCCESS(status);
 926 }
 927
 928 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 929 {
 930         int err;
 931
 932         /* Presence of _PRW indicates wake capable */
 933         if (!acpi_has_method(device->handle, "_PRW"))
 934                 return;
 935
 936         err = acpi_bus_extract_wakeup_device_power_package(device);
 937         if (err) {
 938                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
 939                 return;
 940         }
 941
 942         device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
 943         device->wakeup.prepare_count = 0;
 944         /*
 945          * Call _PSW/_DSW object to disable its ability to wake the sleeping
 946          * system for the ACPI device with the _PRW object.
 947          * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
 948          * So it is necessary to call _DSW object first. Only when it is not
 949          * present will the _PSW object used.
 950          */
 951         err = acpi_device_sleep_wake(device, 0, 0, 0);
 952         if (err)
 953                 pr_debug("error in _DSW or _PSW evaluation\n");
 954 }
 955
 956 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 957 {
 958         struct acpi_device_power_state *ps = &device->power.states[state];
 959         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 960         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 961         acpi_status status;
 962
 963         INIT_LIST_HEAD(&ps->resources);
 964
 965         /* Evaluate "_PRx" to get referenced power resources */
 966         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 967         if (ACPI_SUCCESS(status)) {
 968                 union acpi_object *package = buffer.pointer;
 969
 970                 if (buffer.length && package
 971                     && package->type == ACPI_TYPE_PACKAGE
 972                     && package->package.count)
 973                         acpi_extract_power_resources(package, 0, &ps->resources);
 974
 975                 ACPI_FREE(buffer.pointer);
 976         }
 977
 978         /* Evaluate "_PSx" to see if we can do explicit sets */
 979         pathname[2] = 'S';
 980         if (acpi_has_method(device->handle, pathname))
 981                 ps->flags.explicit_set = 1;
 982
 983         /* State is valid if there are means to put the device into it. */
 984         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
 985                 ps->flags.valid = 1;
 986
 987         ps->power = -1;         /* Unknown - driver assigned */
 988         ps->latency = -1;       /* Unknown - driver assigned */
 989 }
 990
 991 static void acpi_bus_get_power_flags(struct acpi_device *device)
 992 {
 993         u32 i;
 994
 995         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 996         if (!acpi_has_method(device->handle, "_PS0") &&
 997             !acpi_has_method(device->handle, "_PR0"))
 998                 return;
 999
1000         device->flags.power_manageable = 1;
1001
1002         /*
1003          * Power Management Flags
1004          */
1005         if (acpi_has_method(device->handle, "_PSC"))
1006                 device->power.flags.explicit_get = 1;
1007
1008         if (acpi_has_method(device->handle, "_IRC"))
1009                 device->power.flags.inrush_current = 1;
1010
1011         if (acpi_has_method(device->handle, "_DSW"))
1012                 device->power.flags.dsw_present = 1;
1013
1014         /*
1015          * Enumerate supported power management states
1016          */
1017         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1018                 acpi_bus_init_power_state(device, i);
1019
1020         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1021
1022         /* Set the defaults for D0 and D3hot (always supported). */
1023         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1024         device->power.states[ACPI_STATE_D0].power = 100;
1025         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1026
1027         /*
1028          * Use power resources only if the D0 list of them is populated, because
1029          * some platforms may provide _PR3 only to indicate D3cold support and
1030          * in those cases the power resources list returned by it may be bogus.
1031          */
1032         if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1033                 device->power.flags.power_resources = 1;
1034                 /*
1035                  * D3cold is supported if the D3hot list of power resources is
1036                  * not empty.
1037                  */
1038                 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1039                         device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1040         }
1041
1042         if (acpi_bus_init_power(device))
1043                 device->flags.power_manageable = 0;
1044 }
1045
1046 static void acpi_bus_get_flags(struct acpi_device *device)
1047 {
1048         /* Presence of _STA indicates 'dynamic_status' */
1049         if (acpi_has_method(device->handle, "_STA"))
1050                 device->flags.dynamic_status = 1;
1051
1052         /* Presence of _RMV indicates 'removable' */
1053         if (acpi_has_method(device->handle, "_RMV"))
1054                 device->flags.removable = 1;
1055
1056         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1057         if (acpi_has_method(device->handle, "_EJD") ||
1058             acpi_has_method(device->handle, "_EJ0"))
1059                 device->flags.ejectable = 1;
1060 }
1061
1062 static void acpi_device_get_busid(struct acpi_device *device)
1063 {
1064         char bus_id[5] = { '?', 0 };
1065         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1066         int i = 0;
1067
1068         /*
1069          * Bus ID
1070          * ------
1071          * The device's Bus ID is simply the object name.
1072          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1073          */
1074         if (ACPI_IS_ROOT_DEVICE(device)) {
1075                 strcpy(device->pnp.bus_id, "ACPI");
1076                 return;
1077         }
1078
1079         switch (device->device_type) {
1080         case ACPI_BUS_TYPE_POWER_BUTTON:
1081                 strcpy(device->pnp.bus_id, "PWRF");
1082                 break;
1083         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1084                 strcpy(device->pnp.bus_id, "SLPF");
1085                 break;
1086         case ACPI_BUS_TYPE_ECDT_EC:
1087                 strcpy(device->pnp.bus_id, "ECDT");
1088                 break;
1089         default:
1090                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1091                 /* Clean up trailing underscores (if any) */
1092                 for (i = 3; i > 1; i--) {
1093                         if (bus_id[i] == '_')
1094                                 bus_id[i] = '\0';
1095                         else
1096                                 break;
1097                 }
1098                 strcpy(device->pnp.bus_id, bus_id);
1099                 break;
1100         }
1101 }
1102
1103 /*
1104  * acpi_ata_match - see if an acpi object is an ATA device
1105  *
1106  * If an acpi object has one of the ACPI ATA methods defined,
1107  * then we can safely call it an ATA device.
1108  */
1109 bool acpi_ata_match(acpi_handle handle)
1110 {
1111         return acpi_has_method(handle, "_GTF") ||
1112                acpi_has_method(handle, "_GTM") ||
1113                acpi_has_method(handle, "_STM") ||
1114                acpi_has_method(handle, "_SDD");
1115 }
1116
1117 /*
1118  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1119  *
1120  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1121  * then we can safely call it an ejectable drive bay
1122  */
1123 bool acpi_bay_match(acpi_handle handle)
1124 {
1125         acpi_handle phandle;
1126
1127         if (!acpi_has_method(handle, "_EJ0"))
1128                 return false;
1129         if (acpi_ata_match(handle))
1130                 return true;
1131         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1132                 return false;
1133
1134         return acpi_ata_match(phandle);
1135 }
1136
1137 bool acpi_device_is_battery(struct acpi_device *adev)
1138 {
1139         struct acpi_hardware_id *hwid;
1140
1141         list_for_each_entry(hwid, &adev->pnp.ids, list)
1142                 if (!strcmp("PNP0C0A", hwid->id))
1143                         return true;
1144
1145         return false;
1146 }
1147
1148 static bool is_ejectable_bay(struct acpi_device *adev)
1149 {
1150         acpi_handle handle = adev->handle;
1151
1152         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1153                 return true;
1154
1155         return acpi_bay_match(handle);
1156 }
1157
1158 /*
1159  * acpi_dock_match - see if an acpi object has a _DCK method
1160  */
1161 bool acpi_dock_match(acpi_handle handle)
1162 {
1163         return acpi_has_method(handle, "_DCK");
1164 }
1165
1166 static acpi_status
1167 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1168                           void **return_value)
1169 {
1170         long *cap = context;
1171
1172         if (acpi_has_method(handle, "_BCM") &&
1173             acpi_has_method(handle, "_BCL")) {
1174                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1175                                   "support\n"));
1176                 *cap |= ACPI_VIDEO_BACKLIGHT;
1177                 /* We have backlight support, no need to scan further */
1178                 return AE_CTRL_TERMINATE;
1179         }
1180         return 0;
1181 }
1182
1183 /* Returns true if the ACPI object is a video device which can be
1184  * handled by video.ko.
1185  * The device will get a Linux specific CID added in scan.c to
1186  * identify the device as an ACPI graphics device
1187  * Be aware that the graphics device may not be physically present
1188  * Use acpi_video_get_capabilities() to detect general ACPI video
1189  * capabilities of present cards
1190  */
1191 long acpi_is_video_device(acpi_handle handle)
1192 {
1193         long video_caps = 0;
1194
1195         /* Is this device able to support video switching ? */
1196         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1197                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1198
1199         /* Is this device able to retrieve a video ROM ? */
1200         if (acpi_has_method(handle, "_ROM"))
1201                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1202
1203         /* Is this device able to configure which video head to be POSTed ? */
1204         if (acpi_has_method(handle, "_VPO") &&
1205             acpi_has_method(handle, "_GPD") &&
1206             acpi_has_method(handle, "_SPD"))
1207                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1208
1209         /* Only check for backlight functionality if one of the above hit. */
1210         if (video_caps)
1211                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1212                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1213                                     &video_caps, NULL);
1214
1215         return video_caps;
1216 }
1217 EXPORT_SYMBOL(acpi_is_video_device);
1218
1219 const char *acpi_device_hid(struct acpi_device *device)
1220 {
1221         struct acpi_hardware_id *hid;
1222
1223         if (list_empty(&device->pnp.ids))
1224                 return dummy_hid;
1225
1226         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1227         return hid->id;
1228 }
1229 EXPORT_SYMBOL(acpi_device_hid);
1230
1231 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1232 {
1233         struct acpi_hardware_id *id;
1234
1235         id = kmalloc(sizeof(*id), GFP_KERNEL);
1236         if (!id)
1237                 return;
1238
1239         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1240         if (!id->id) {
1241                 kfree(id);
1242                 return;
1243         }
1244
1245         list_add_tail(&id->list, &pnp->ids);
1246         pnp->type.hardware_id = 1;
1247 }
1248
1249 /*
1250  * Old IBM workstations have a DSDT bug wherein the SMBus object
1251  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1252  * prefix.  Work around this.
1253  */
1254 static bool acpi_ibm_smbus_match(acpi_handle handle)
1255 {
1256         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1257         struct acpi_buffer path = { sizeof(node_name), node_name };
1258
1259         if (!dmi_name_in_vendors("IBM"))
1260                 return false;
1261
1262         /* Look for SMBS object */
1263         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1264             strcmp("SMBS", path.pointer))
1265                 return false;
1266
1267         /* Does it have the necessary (but misnamed) methods? */
1268         if (acpi_has_method(handle, "SBI") &&
1269             acpi_has_method(handle, "SBR") &&
1270             acpi_has_method(handle, "SBW"))
1271                 return true;
1272
1273         return false;
1274 }
1275
1276 static bool acpi_object_is_system_bus(acpi_handle handle)
1277 {
1278         acpi_handle tmp;
1279
1280         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1281             tmp == handle)
1282                 return true;
1283         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1284             tmp == handle)
1285                 return true;
1286
1287         return false;
1288 }
1289
1290 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1291                                 int device_type, struct acpi_device_info *info)
1292 {
1293         struct acpi_pnp_device_id_list *cid_list;
1294         int i;
1295
1296         switch (device_type) {
1297         case ACPI_BUS_TYPE_DEVICE:
1298                 if (handle == ACPI_ROOT_OBJECT) {
1299                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1300                         break;
1301                 }
1302
1303                 if (!info) {
1304                         pr_err(PREFIX "%s: Error reading device info\n",
1305                                         __func__);
1306                         return;
1307                 }
1308
1309                 if (info->valid & ACPI_VALID_HID) {
1310                         acpi_add_id(pnp, info->hardware_id.string);
1311                         pnp->type.platform_id = 1;
1312                 }
1313                 if (info->valid & ACPI_VALID_CID) {
1314                         cid_list = &info->compatible_id_list;
1315                         for (i = 0; i < cid_list->count; i++)
1316                                 acpi_add_id(pnp, cid_list->ids[i].string);
1317                 }
1318                 if (info->valid & ACPI_VALID_ADR) {
1319                         pnp->bus_address = info->address;
1320                         pnp->type.bus_address = 1;
1321                 }
1322                 if (info->valid & ACPI_VALID_UID)
1323                         pnp->unique_id = kstrdup(info->unique_id.string,
1324                                                         GFP_KERNEL);
1325                 if (info->valid & ACPI_VALID_CLS)
1326                         acpi_add_id(pnp, info->class_code.string);
1327
1328                 /*
1329                  * Some devices don't reliably have _HIDs & _CIDs, so add
1330                  * synthetic HIDs to make sure drivers can find them.
1331                  */
1332                 if (acpi_is_video_device(handle))
1333                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1334                 else if (acpi_bay_match(handle))
1335                         acpi_add_id(pnp, ACPI_BAY_HID);
1336                 else if (acpi_dock_match(handle))
1337                         acpi_add_id(pnp, ACPI_DOCK_HID);
1338                 else if (acpi_ibm_smbus_match(handle))
1339                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1340                 else if (list_empty(&pnp->ids) &&
1341                          acpi_object_is_system_bus(handle)) {
1342                         /* \_SB, \_TZ, LNXSYBUS */
1343                         acpi_add_id(pnp, ACPI_BUS_HID);
1344                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1345                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1346                 }
1347
1348                 break;
1349         case ACPI_BUS_TYPE_POWER:
1350                 acpi_add_id(pnp, ACPI_POWER_HID);
1351                 break;
1352         case ACPI_BUS_TYPE_PROCESSOR:
1353                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1354                 break;
1355         case ACPI_BUS_TYPE_THERMAL:
1356                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1357                 break;
1358         case ACPI_BUS_TYPE_POWER_BUTTON:
1359                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1360                 break;
1361         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1362                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1363                 break;
1364         case ACPI_BUS_TYPE_ECDT_EC:
1365                 acpi_add_id(pnp, ACPI_ECDT_HID);
1366                 break;
1367         }
1368 }
1369
1370 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1371 {
1372         struct acpi_hardware_id *id, *tmp;
1373
1374         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1375                 kfree_const(id->id);
1376                 kfree(id);
1377         }
1378         kfree(pnp->unique_id);
1379 }
1380
1381 /**
1382  * acpi_dma_supported - Check DMA support for the specified device.
1383  * @adev: The pointer to acpi device
1384  *
1385  * Return false if DMA is not supported. Otherwise, return true
1386  */
1387 bool acpi_dma_supported(struct acpi_device *adev)
1388 {
1389         if (!adev)
1390                 return false;
1391
1392         if (adev->flags.cca_seen)
1393                 return true;
1394
1395         /*
1396         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1397         * DMA on "Intel platforms".  Presumably that includes all x86 and
1398         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1399         */
1400         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1401                 return true;
1402
1403         return false;
1404 }
1405
1406 /**
1407  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1408  * @adev: The pointer to acpi device
1409  *
1410  * Return enum dev_dma_attr.
1411  */
1412 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1413 {
1414         if (!acpi_dma_supported(adev))
1415                 return DEV_DMA_NOT_SUPPORTED;
1416
1417         if (adev->flags.coherent_dma)
1418                 return DEV_DMA_COHERENT;
1419         else
1420                 return DEV_DMA_NON_COHERENT;
1421 }
1422
1423 /**
1424  * acpi_dma_get_range() - Get device DMA parameters.
1425  *
1426  * @dev: device to configure
1427  * @dma_addr: pointer device DMA address result
1428  * @offset: pointer to the DMA offset result
1429  * @size: pointer to DMA range size result
1430  *
1431  * Evaluate DMA regions and return respectively DMA region start, offset
1432  * and size in dma_addr, offset and size on parsing success; it does not
1433  * update the passed in values on failure.
1434  *
1435  * Return 0 on success, < 0 on failure.
1436  */
1437 int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1438                        u64 *size)
1439 {
1440         struct acpi_device *adev;
1441         LIST_HEAD(list);
1442         struct resource_entry *rentry;
1443         int ret;
1444         struct device *dma_dev = dev;
1445         u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1446
1447         /*
1448          * Walk the device tree chasing an ACPI companion with a _DMA
1449          * object while we go. Stop if we find a device with an ACPI
1450          * companion containing a _DMA method.
1451          */
1452         do {
1453                 adev = ACPI_COMPANION(dma_dev);
1454                 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1455                         break;
1456
1457                 dma_dev = dma_dev->parent;
1458         } while (dma_dev);
1459
1460         if (!dma_dev)
1461                 return -ENODEV;
1462
1463         if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1464                 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1465                 return -EINVAL;
1466         }
1467
1468         ret = acpi_dev_get_dma_resources(adev, &list);
1469         if (ret > 0) {
1470                 list_for_each_entry(rentry, &list, node) {
1471                         if (dma_offset && rentry->offset != dma_offset) {
1472                                 ret = -EINVAL;
1473                                 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1474                                 goto out;
1475                         }
1476                         dma_offset = rentry->offset;
1477
1478                         /* Take lower and upper limits */
1479                         if (rentry->res->start < dma_start)
1480                                 dma_start = rentry->res->start;
1481                         if (rentry->res->end > dma_end)
1482                                 dma_end = rentry->res->end;
1483                 }
1484
1485                 if (dma_start >= dma_end) {
1486                         ret = -EINVAL;
1487                         dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1488                         goto out;
1489                 }
1490
1491                 *dma_addr = dma_start - dma_offset;
1492                 len = dma_end - dma_start;
1493                 *size = max(len, len + 1);
1494                 *offset = dma_offset;
1495         }
1496  out:
1497         acpi_dev_free_resource_list(&list);
1498
1499         return ret >= 0 ? 0 : ret;
1500 }
1501
1502 /**
1503  * acpi_dma_configure_id - Set-up DMA configuration for the device.
1504  * @dev: The pointer to the device
1505  * @attr: device dma attributes
1506  * @input_id: input device id const value pointer
1507  */
1508 int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1509                           const u32 *input_id)
1510 {
1511         const struct iommu_ops *iommu;
1512         u64 dma_addr = 0, size = 0;
1513
1514         if (attr == DEV_DMA_NOT_SUPPORTED) {
1515                 set_dma_ops(dev, &dma_dummy_ops);
1516                 return 0;
1517         }
1518
1519         iort_dma_setup(dev, &dma_addr, &size);
1520
1521         iommu = iort_iommu_configure_id(dev, input_id);
1522         if (PTR_ERR(iommu) == -EPROBE_DEFER)
1523                 return -EPROBE_DEFER;
1524
1525         arch_setup_dma_ops(dev, dma_addr, size,
1526                                 iommu, attr == DEV_DMA_COHERENT);
1527
1528         return 0;
1529 }
1530 EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1531
1532 static void acpi_init_coherency(struct acpi_device *adev)
1533 {
1534         unsigned long long cca = 0;
1535         acpi_status status;
1536         struct acpi_device *parent = adev->parent;
1537
1538         if (parent && parent->flags.cca_seen) {
1539                 /*
1540                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1541                  * already saw one.
1542                  */
1543                 adev->flags.cca_seen = 1;
1544                 cca = parent->flags.coherent_dma;
1545         } else {
1546                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1547                                                NULL, &cca);
1548                 if (ACPI_SUCCESS(status))
1549                         adev->flags.cca_seen = 1;
1550                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1551                         /*
1552                          * If architecture does not specify that _CCA is
1553                          * required for DMA-able devices (e.g. x86),
1554                          * we default to _CCA=1.
1555                          */
1556                         cca = 1;
1557                 else
1558                         acpi_handle_debug(adev->handle,
1559                                           "ACPI device is missing _CCA.\n");
1560         }
1561
1562         adev->flags.coherent_dma = cca;
1563 }
1564
1565 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1566 {
1567         bool *is_serial_bus_slave_p = data;
1568
1569         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1570                 return 1;
1571
1572         *is_serial_bus_slave_p = true;
1573
1574          /* no need to do more checking */
1575         return -1;
1576 }
1577
1578 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1579 {
1580         struct acpi_device *parent = device->parent;
1581         static const struct acpi_device_id indirect_io_hosts[] = {
1582                 {"HISI0191", 0},
1583                 {}
1584         };
1585
1586         return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1587 }
1588
1589 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1590 {
1591         struct list_head resource_list;
1592         bool is_serial_bus_slave = false;
1593         /*
1594          * These devices have multiple I2cSerialBus resources and an i2c-client
1595          * must be instantiated for each, each with its own i2c_device_id.
1596          * Normally we only instantiate an i2c-client for the first resource,
1597          * using the ACPI HID as id. These special cases are handled by the
1598          * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
1599          * which i2c_device_id to use for each resource.
1600          */
1601         static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
1602                 {"BSG1160", },
1603                 {"BSG2150", },
1604                 {"INT33FE", },
1605                 {"INT3515", },
1606                 {}
1607         };
1608
1609         if (acpi_is_indirect_io_slave(device))
1610                 return true;
1611
1612         /* Macs use device properties in lieu of _CRS resources */
1613         if (x86_apple_machine &&
1614             (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1615              fwnode_property_present(&device->fwnode, "i2cAddress") ||
1616              fwnode_property_present(&device->fwnode, "baud")))
1617                 return true;
1618
1619         /* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */
1620         if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
1621                 return false;
1622
1623         INIT_LIST_HEAD(&resource_list);
1624         acpi_dev_get_resources(device, &resource_list,
1625                                acpi_check_serial_bus_slave,
1626                                &is_serial_bus_slave);
1627         acpi_dev_free_resource_list(&resource_list);
1628
1629         return is_serial_bus_slave;
1630 }
1631
1632 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1633                              int type, unsigned long long sta,
1634                              struct acpi_device_info *info)
1635 {
1636         INIT_LIST_HEAD(&device->pnp.ids);
1637         device->device_type = type;
1638         device->handle = handle;
1639         device->parent = acpi_bus_get_parent(handle);
1640         fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
1641         acpi_set_device_status(device, sta);
1642         acpi_device_get_busid(device);
1643         acpi_set_pnp_ids(handle, &device->pnp, type, info);
1644         acpi_init_properties(device);
1645         acpi_bus_get_flags(device);
1646         device->flags.match_driver = false;
1647         device->flags.initialized = true;
1648         device->flags.enumeration_by_parent =
1649                 acpi_device_enumeration_by_parent(device);
1650         acpi_device_clear_enumerated(device);
1651         device_initialize(&device->dev);
1652         dev_set_uevent_suppress(&device->dev, true);
1653         acpi_init_coherency(device);
1654 }
1655
1656 void acpi_device_add_finalize(struct acpi_device *device)
1657 {
1658         dev_set_uevent_suppress(&device->dev, false);
1659         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1660 }
1661
1662 static int acpi_add_single_object(struct acpi_device **child,
1663                                   acpi_handle handle, int type,
1664                                   unsigned long long sta)
1665 {
1666         int result;
1667         struct acpi_device *device;
1668         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1669         struct acpi_device_info *info = NULL;
1670
1671         if (handle != ACPI_ROOT_OBJECT && type == ACPI_BUS_TYPE_DEVICE)
1672                 acpi_get_object_info(handle, &info);
1673
1674         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1675         if (!device) {
1676                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1677                 kfree(info);
1678                 return -ENOMEM;
1679         }
1680
1681         acpi_init_device_object(device, handle, type, sta, info);
1682         kfree(info);
1683         /*
1684          * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so
1685          * that we can call acpi_bus_get_status() and use its quirk handling.
1686          * Note this must be done before the get power-/wakeup_dev-flags calls.
1687          */
1688         if (type == ACPI_BUS_TYPE_DEVICE)
1689                 if (acpi_bus_get_status(device) < 0)
1690                         acpi_set_device_status(device, 0);
1691
1692         acpi_bus_get_power_flags(device);
1693         acpi_bus_get_wakeup_device_flags(device);
1694
1695         result = acpi_device_add(device, acpi_device_release);
1696         if (result) {
1697                 acpi_device_release(&device->dev);
1698                 return result;
1699         }
1700
1701         acpi_power_add_remove_device(device, true);
1702         acpi_device_add_finalize(device);
1703         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1704         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1705                 dev_name(&device->dev), (char *) buffer.pointer,
1706                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1707         kfree(buffer.pointer);
1708         *child = device;
1709         return 0;
1710 }
1711
1712 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1713                                             void *context)
1714 {
1715         struct resource *res = context;
1716
1717         if (acpi_dev_resource_memory(ares, res))
1718                 return AE_CTRL_TERMINATE;
1719
1720         return AE_OK;
1721 }
1722
1723 static bool acpi_device_should_be_hidden(acpi_handle handle)
1724 {
1725         acpi_status status;
1726         struct resource res;
1727
1728         /* Check if it should ignore the UART device */
1729         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1730                 return false;
1731
1732         /*
1733          * The UART device described in SPCR table is assumed to have only one
1734          * memory resource present. So we only look for the first one here.
1735          */
1736         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1737                                      acpi_get_resource_memory, &res);
1738         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1739                 return false;
1740
1741         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1742                          &res.start);
1743
1744         return true;
1745 }
1746
1747 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1748                                     unsigned long long *sta)
1749 {
1750         acpi_status status;
1751         acpi_object_type acpi_type;
1752
1753         status = acpi_get_type(handle, &acpi_type);
1754         if (ACPI_FAILURE(status))
1755                 return -ENODEV;
1756
1757         switch (acpi_type) {
1758         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1759         case ACPI_TYPE_DEVICE:
1760                 if (acpi_device_should_be_hidden(handle))
1761                         return -ENODEV;
1762
1763                 *type = ACPI_BUS_TYPE_DEVICE;
1764                 /*
1765                  * acpi_add_single_object updates this once we've an acpi_device
1766                  * so that acpi_bus_get_status' quirk handling can be used.
1767                  */
1768                 *sta = ACPI_STA_DEFAULT;
1769                 break;
1770         case ACPI_TYPE_PROCESSOR:
1771                 *type = ACPI_BUS_TYPE_PROCESSOR;
1772                 status = acpi_bus_get_status_handle(handle, sta);
1773                 if (ACPI_FAILURE(status))
1774                         return -ENODEV;
1775                 break;
1776         case ACPI_TYPE_THERMAL:
1777                 *type = ACPI_BUS_TYPE_THERMAL;
1778                 *sta = ACPI_STA_DEFAULT;
1779                 break;
1780         case ACPI_TYPE_POWER:
1781                 *type = ACPI_BUS_TYPE_POWER;
1782                 *sta = ACPI_STA_DEFAULT;
1783                 break;
1784         default:
1785                 return -ENODEV;
1786         }
1787
1788         return 0;
1789 }
1790
1791 bool acpi_device_is_present(const struct acpi_device *adev)
1792 {
1793         return adev->status.present || adev->status.functional;
1794 }
1795
1796 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1797                                        const char *idstr,
1798                                        const struct acpi_device_id **matchid)
1799 {
1800         const struct acpi_device_id *devid;
1801
1802         if (handler->match)
1803                 return handler->match(idstr, matchid);
1804
1805         for (devid = handler->ids; devid->id[0]; devid++)
1806                 if (!strcmp((char *)devid->id, idstr)) {
1807                         if (matchid)
1808                                 *matchid = devid;
1809
1810                         return true;
1811                 }
1812
1813         return false;
1814 }
1815
1816 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1817                                         const struct acpi_device_id **matchid)
1818 {
1819         struct acpi_scan_handler *handler;
1820
1821         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1822                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1823                         return handler;
1824
1825         return NULL;
1826 }
1827
1828 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1829 {
1830         if (!!hotplug->enabled == !!val)
1831                 return;
1832
1833         mutex_lock(&acpi_scan_lock);
1834
1835         hotplug->enabled = val;
1836
1837         mutex_unlock(&acpi_scan_lock);
1838 }
1839
1840 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1841 {
1842         struct acpi_hardware_id *hwid;
1843
1844         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1845                 acpi_dock_add(adev);
1846                 return;
1847         }
1848         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1849                 struct acpi_scan_handler *handler;
1850
1851                 handler = acpi_scan_match_handler(hwid->id, NULL);
1852                 if (handler) {
1853                         adev->flags.hotplug_notify = true;
1854                         break;
1855                 }
1856         }
1857 }
1858
1859 static u32 acpi_scan_check_dep(acpi_handle handle)
1860 {
1861         struct acpi_handle_list dep_devices;
1862         acpi_status status;
1863         u32 count;
1864         int i;
1865
1866         /*
1867          * Check for _HID here to avoid deferring the enumeration of:
1868          * 1. PCI devices.
1869          * 2. ACPI nodes describing USB ports.
1870          * Still, checking for _HID catches more then just these cases ...
1871          */
1872         if (!acpi_has_method(handle, "_DEP") || !acpi_has_method(handle, "_HID"))
1873                 return 0;
1874
1875         status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices);
1876         if (ACPI_FAILURE(status)) {
1877                 acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
1878                 return 0;
1879         }
1880
1881         for (count = 0, i = 0; i < dep_devices.count; i++) {
1882                 struct acpi_device_info *info;
1883                 struct acpi_dep_data *dep;
1884                 bool skip;
1885
1886                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1887                 if (ACPI_FAILURE(status)) {
1888                         acpi_handle_debug(handle, "Error reading _DEP device info\n");
1889                         continue;
1890                 }
1891
1892                 skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
1893                 kfree(info);
1894
1895                 if (skip)
1896                         continue;
1897
1898                 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1899                 if (!dep)
1900                         continue;
1901
1902                 count++;
1903
1904                 dep->supplier = dep_devices.handles[i];
1905                 dep->consumer = handle;
1906
1907                 mutex_lock(&acpi_dep_list_lock);
1908                 list_add_tail(&dep->node , &acpi_dep_list);
1909                 mutex_unlock(&acpi_dep_list_lock);
1910         }
1911
1912         return count;
1913 }
1914
1915 static void acpi_scan_dep_init(struct acpi_device *adev)
1916 {
1917         struct acpi_dep_data *dep;
1918
1919         mutex_lock(&acpi_dep_list_lock);
1920
1921         list_for_each_entry(dep, &acpi_dep_list, node) {
1922                 if (dep->consumer == adev->handle)
1923                         adev->dep_unmet++;
1924         }
1925
1926         mutex_unlock(&acpi_dep_list_lock);
1927 }
1928
1929 static bool acpi_bus_scan_second_pass;
1930
1931 static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep,
1932                                       struct acpi_device **adev_p)
1933 {
1934         struct acpi_device *device = NULL;
1935         unsigned long long sta;
1936         int type;
1937         int result;
1938
1939         acpi_bus_get_device(handle, &device);
1940         if (device)
1941                 goto out;
1942
1943         result = acpi_bus_type_and_status(handle, &type, &sta);
1944         if (result)
1945                 return AE_OK;
1946
1947         if (type == ACPI_BUS_TYPE_POWER) {
1948                 acpi_add_power_resource(handle);
1949                 return AE_OK;
1950         }
1951
1952         if (type == ACPI_BUS_TYPE_DEVICE && check_dep) {
1953                 u32 count = acpi_scan_check_dep(handle);
1954                 /* Bail out if the number of recorded dependencies is not 0. */
1955                 if (count > 0) {
1956                         acpi_bus_scan_second_pass = true;
1957                         return AE_CTRL_DEPTH;
1958                 }
1959         }
1960
1961         acpi_add_single_object(&device, handle, type, sta);
1962         if (!device)
1963                 return AE_CTRL_DEPTH;
1964
1965         acpi_scan_init_hotplug(device);
1966         if (!check_dep)
1967                 acpi_scan_dep_init(device);
1968
1969 out:
1970         if (!*adev_p)
1971                 *adev_p = device;
1972
1973         return AE_OK;
1974 }
1975
1976 static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
1977                                         void *not_used, void **ret_p)
1978 {
1979         return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
1980 }
1981
1982 static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
1983                                         void *not_used, void **ret_p)
1984 {
1985         return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
1986 }
1987
1988 static void acpi_default_enumeration(struct acpi_device *device)
1989 {
1990         /*
1991          * Do not enumerate devices with enumeration_by_parent flag set as
1992          * they will be enumerated by their respective parents.
1993          */
1994         if (!device->flags.enumeration_by_parent) {
1995                 acpi_create_platform_device(device, NULL);
1996                 acpi_device_set_enumerated(device);
1997         } else {
1998                 blocking_notifier_call_chain(&acpi_reconfig_chain,
1999                                              ACPI_RECONFIG_DEVICE_ADD, device);
2000         }
2001 }
2002
2003 static const struct acpi_device_id generic_device_ids[] = {
2004         {ACPI_DT_NAMESPACE_HID, },
2005         {"", },
2006 };
2007
2008 static int acpi_generic_device_attach(struct acpi_device *adev,
2009                                       const struct acpi_device_id *not_used)
2010 {
2011         /*
2012          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
2013          * below can be unconditional.
2014          */
2015         if (adev->data.of_compatible)
2016                 acpi_default_enumeration(adev);
2017
2018         return 1;
2019 }
2020
2021 static struct acpi_scan_handler generic_device_handler = {
2022         .ids = generic_device_ids,
2023         .attach = acpi_generic_device_attach,
2024 };
2025
2026 static int acpi_scan_attach_handler(struct acpi_device *device)
2027 {
2028         struct acpi_hardware_id *hwid;
2029         int ret = 0;
2030
2031         list_for_each_entry(hwid, &device->pnp.ids, list) {
2032                 const struct acpi_device_id *devid;
2033                 struct acpi_scan_handler *handler;
2034
2035                 handler = acpi_scan_match_handler(hwid->id, &devid);
2036                 if (handler) {
2037                         if (!handler->attach) {
2038                                 device->pnp.type.platform_id = 0;
2039                                 continue;
2040                         }
2041                         device->handler = handler;
2042                         ret = handler->attach(device, devid);
2043                         if (ret > 0)
2044                                 break;
2045
2046                         device->handler = NULL;
2047                         if (ret < 0)
2048                                 break;
2049                 }
2050         }
2051
2052         return ret;
2053 }
2054
2055 static void acpi_bus_attach(struct acpi_device *device, bool first_pass)
2056 {
2057         struct acpi_device *child;
2058         bool skip = !first_pass && device->flags.visited;
2059         acpi_handle ejd;
2060         int ret;
2061
2062         if (skip)
2063                 goto ok;
2064
2065         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2066                 register_dock_dependent_device(device, ejd);
2067
2068         acpi_bus_get_status(device);
2069         /* Skip devices that are not present. */
2070         if (!acpi_device_is_present(device)) {
2071                 device->flags.initialized = false;
2072                 acpi_device_clear_enumerated(device);
2073                 device->flags.power_manageable = 0;
2074                 return;
2075         }
2076         if (device->handler)
2077                 goto ok;
2078
2079         if (!device->flags.initialized) {
2080                 device->flags.power_manageable =
2081                         device->power.states[ACPI_STATE_D0].flags.valid;
2082                 if (acpi_bus_init_power(device))
2083                         device->flags.power_manageable = 0;
2084
2085                 device->flags.initialized = true;
2086         } else if (device->flags.visited) {
2087                 goto ok;
2088         }
2089
2090         ret = acpi_scan_attach_handler(device);
2091         if (ret < 0)
2092                 return;
2093
2094         device->flags.match_driver = true;
2095         if (ret > 0 && !device->flags.enumeration_by_parent) {
2096                 acpi_device_set_enumerated(device);
2097                 goto ok;
2098         }
2099
2100         ret = device_attach(&device->dev);
2101         if (ret < 0)
2102                 return;
2103
2104         if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2105                 acpi_default_enumeration(device);
2106         else
2107                 acpi_device_set_enumerated(device);
2108
2109  ok:
2110         list_for_each_entry(child, &device->children, node)
2111                 acpi_bus_attach(child, first_pass);
2112
2113         if (!skip && device->handler && device->handler->hotplug.notify_online)
2114                 device->handler->hotplug.notify_online(device);
2115 }
2116
2117 void acpi_walk_dep_device_list(acpi_handle handle)
2118 {
2119         struct acpi_dep_data *dep, *tmp;
2120         struct acpi_device *adev;
2121
2122         mutex_lock(&acpi_dep_list_lock);
2123         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2124                 if (dep->supplier == handle) {
2125                         acpi_bus_get_device(dep->consumer, &adev);
2126
2127                         if (adev) {
2128                                 adev->dep_unmet--;
2129                                 if (!adev->dep_unmet)
2130                                         acpi_bus_attach(adev, true);
2131                         }
2132
2133                         list_del(&dep->node);
2134                         kfree(dep);
2135                 }
2136         }
2137         mutex_unlock(&acpi_dep_list_lock);
2138 }
2139 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2140
2141 /**
2142  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2143  * @handle: Root of the namespace scope to scan.
2144  *
2145  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2146  * found devices.
2147  *
2148  * If no devices were found, -ENODEV is returned, but it does not mean that
2149  * there has been a real error.  There just have been no suitable ACPI objects
2150  * in the table trunk from which the kernel could create a device and add an
2151  * appropriate driver.
2152  *
2153  * Must be called under acpi_scan_lock.
2154  */
2155 int acpi_bus_scan(acpi_handle handle)
2156 {
2157         struct acpi_device *device = NULL;
2158
2159         acpi_bus_scan_second_pass = false;
2160
2161         /* Pass 1: Avoid enumerating devices with missing dependencies. */
2162
2163         if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
2164                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2165                                     acpi_bus_check_add_1, NULL, NULL,
2166                                     (void **)&device);
2167
2168         if (!device)
2169                 return -ENODEV;
2170
2171         acpi_bus_attach(device, true);
2172
2173         if (!acpi_bus_scan_second_pass)
2174                 return 0;
2175
2176         /* Pass 2: Enumerate all of the remaining devices. */
2177
2178         device = NULL;
2179
2180         if (ACPI_SUCCESS(acpi_bus_check_add(handle, false, &device)))
2181                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2182                                     acpi_bus_check_add_2, NULL, NULL,
2183                                     (void **)&device);
2184
2185         acpi_bus_attach(device, false);
2186
2187         return 0;
2188 }
2189 EXPORT_SYMBOL(acpi_bus_scan);
2190
2191 /**
2192  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2193  * @adev: Root of the ACPI namespace scope to walk.
2194  *
2195  * Must be called under acpi_scan_lock.
2196  */
2197 void acpi_bus_trim(struct acpi_device *adev)
2198 {
2199         struct acpi_scan_handler *handler = adev->handler;
2200         struct acpi_device *child;
2201
2202         list_for_each_entry_reverse(child, &adev->children, node)
2203                 acpi_bus_trim(child);
2204
2205         adev->flags.match_driver = false;
2206         if (handler) {
2207                 if (handler->detach)
2208                         handler->detach(adev);
2209
2210                 adev->handler = NULL;
2211         } else {
2212                 device_release_driver(&adev->dev);
2213         }
2214         /*
2215          * Most likely, the device is going away, so put it into D3cold before
2216          * that.
2217          */
2218         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2219         adev->flags.initialized = false;
2220         acpi_device_clear_enumerated(adev);
2221 }
2222 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2223
2224 int acpi_bus_register_early_device(int type)
2225 {
2226         struct acpi_device *device = NULL;
2227         int result;
2228
2229         result = acpi_add_single_object(&device, NULL,
2230                                         type, ACPI_STA_DEFAULT);
2231         if (result)
2232                 return result;
2233
2234         device->flags.match_driver = true;
2235         return device_attach(&device->dev);
2236 }
2237 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2238
2239 static int acpi_bus_scan_fixed(void)
2240 {
2241         int result = 0;
2242
2243         /*
2244          * Enumerate all fixed-feature devices.
2245          */
2246         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2247                 struct acpi_device *device = NULL;
2248
2249                 result = acpi_add_single_object(&device, NULL,
2250                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2251                                                 ACPI_STA_DEFAULT);
2252                 if (result)
2253                         return result;
2254
2255                 device->flags.match_driver = true;
2256                 result = device_attach(&device->dev);
2257                 if (result < 0)
2258                         return result;
2259
2260                 device_init_wakeup(&device->dev, true);
2261         }
2262
2263         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2264                 struct acpi_device *device = NULL;
2265
2266                 result = acpi_add_single_object(&device, NULL,
2267                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2268                                                 ACPI_STA_DEFAULT);
2269                 if (result)
2270                         return result;
2271
2272                 device->flags.match_driver = true;
2273                 result = device_attach(&device->dev);
2274         }
2275
2276         return result < 0 ? result : 0;
2277 }
2278
2279 static void __init acpi_get_spcr_uart_addr(void)
2280 {
2281         acpi_status status;
2282         struct acpi_table_spcr *spcr_ptr;
2283
2284         status = acpi_get_table(ACPI_SIG_SPCR, 0,
2285                                 (struct acpi_table_header **)&spcr_ptr);
2286         if (ACPI_FAILURE(status)) {
2287                 pr_warn(PREFIX "STAO table present, but SPCR is missing\n");
2288                 return;
2289         }
2290
2291         spcr_uart_addr = spcr_ptr->serial_port.address;
2292         acpi_put_table((struct acpi_table_header *)spcr_ptr);
2293 }
2294
2295 static bool acpi_scan_initialized;
2296
2297 int __init acpi_scan_init(void)
2298 {
2299         int result;
2300         acpi_status status;
2301         struct acpi_table_stao *stao_ptr;
2302
2303         acpi_pci_root_init();
2304         acpi_pci_link_init();
2305         acpi_processor_init();
2306         acpi_platform_init();
2307         acpi_lpss_init();
2308         acpi_apd_init();
2309         acpi_cmos_rtc_init();
2310         acpi_container_init();
2311         acpi_memory_hotplug_init();
2312         acpi_watchdog_init();
2313         acpi_pnp_init();
2314         acpi_int340x_thermal_init();
2315         acpi_amba_init();
2316         acpi_init_lpit();
2317
2318         acpi_scan_add_handler(&generic_device_handler);
2319
2320         /*
2321          * If there is STAO table, check whether it needs to ignore the UART
2322          * device in SPCR table.
2323          */
2324         status = acpi_get_table(ACPI_SIG_STAO, 0,
2325                                 (struct acpi_table_header **)&stao_ptr);
2326         if (ACPI_SUCCESS(status)) {
2327                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2328                         pr_info(PREFIX "STAO Name List not yet supported.\n");
2329
2330                 if (stao_ptr->ignore_uart)
2331                         acpi_get_spcr_uart_addr();
2332
2333                 acpi_put_table((struct acpi_table_header *)stao_ptr);
2334         }
2335
2336         acpi_gpe_apply_masked_gpes();
2337         acpi_update_all_gpes();
2338
2339         /*
2340          * Although we call __add_memory() that is documented to require the
2341          * device_hotplug_lock, it is not necessary here because this is an
2342          * early code when userspace or any other code path cannot trigger
2343          * hotplug/hotunplug operations.
2344          */
2345         mutex_lock(&acpi_scan_lock);
2346         /*
2347          * Enumerate devices in the ACPI namespace.
2348          */
2349         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2350         if (result)
2351                 goto out;
2352
2353         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2354         if (result)
2355                 goto out;
2356
2357         /* Fixed feature devices do not exist on HW-reduced platform */
2358         if (!acpi_gbl_reduced_hardware) {
2359                 result = acpi_bus_scan_fixed();
2360                 if (result) {
2361                         acpi_detach_data(acpi_root->handle,
2362                                          acpi_scan_drop_device);
2363                         acpi_device_del(acpi_root);
2364                         put_device(&acpi_root->dev);
2365                         goto out;
2366                 }
2367         }
2368
2369         acpi_scan_initialized = true;
2370
2371  out:
2372         mutex_unlock(&acpi_scan_lock);
2373         return result;
2374 }
2375
2376 static struct acpi_probe_entry *ape;
2377 static int acpi_probe_count;
2378 static DEFINE_MUTEX(acpi_probe_mutex);
2379
2380 static int __init acpi_match_madt(union acpi_subtable_headers *header,
2381                                   const unsigned long end)
2382 {
2383         if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2384                 if (!ape->probe_subtbl(header, end))
2385                         acpi_probe_count++;
2386
2387         return 0;
2388 }
2389
2390 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2391 {
2392         int count = 0;
2393
2394         if (acpi_disabled)
2395                 return 0;
2396
2397         mutex_lock(&acpi_probe_mutex);
2398         for (ape = ap_head; nr; ape++, nr--) {
2399                 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2400                         acpi_probe_count = 0;
2401                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2402                         count += acpi_probe_count;
2403                 } else {
2404                         int res;
2405                         res = acpi_table_parse(ape->id, ape->probe_table);
2406                         if (!res)
2407                                 count++;
2408                 }
2409         }
2410         mutex_unlock(&acpi_probe_mutex);
2411
2412         return count;
2413 }
2414
2415 struct acpi_table_events_work {
2416         struct work_struct work;
2417         void *table;
2418         u32 event;
2419 };
2420
2421 static void acpi_table_events_fn(struct work_struct *work)
2422 {
2423         struct acpi_table_events_work *tew;
2424
2425         tew = container_of(work, struct acpi_table_events_work, work);
2426
2427         if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2428                 acpi_scan_lock_acquire();
2429                 acpi_bus_scan(ACPI_ROOT_OBJECT);
2430                 acpi_scan_lock_release();
2431         }
2432
2433         kfree(tew);
2434 }
2435
2436 void acpi_scan_table_handler(u32 event, void *table, void *context)
2437 {
2438         struct acpi_table_events_work *tew;
2439
2440         if (!acpi_scan_initialized)
2441                 return;
2442
2443         if (event != ACPI_TABLE_EVENT_LOAD)
2444                 return;
2445
2446         tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2447         if (!tew)
2448                 return;
2449
2450         INIT_WORK(&tew->work, acpi_table_events_fn);
2451         tew->table = table;
2452         tew->event = event;
2453
2454         schedule_work(&tew->work);
2455 }
2456
2457 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2458 {
2459         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2460 }
2461 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2462
2463 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2464 {
2465         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2466 }
2467 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);