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