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