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 extern struct acpi_device *acpi_root;
  23
  24 #define ACPI_BUS_CLASS                  "system_bus"
  25 #define ACPI_BUS_HID                    "LNXSYBUS"
  26 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  27
  28 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  29
  30 #define INVALID_ACPI_HANDLE     ((acpi_handle)empty_zero_page)
  31
  32 static const char *dummy_hid = "device";
  33
  34 static LIST_HEAD(acpi_dep_list);
  35 static DEFINE_MUTEX(acpi_dep_list_lock);
  36 LIST_HEAD(acpi_bus_id_list);
  37 static DEFINE_MUTEX(acpi_scan_lock);
  38 static LIST_HEAD(acpi_scan_handlers_list);
  39 DEFINE_MUTEX(acpi_device_lock);
  40 LIST_HEAD(acpi_wakeup_device_list);
  41 static DEFINE_MUTEX(acpi_hp_context_lock);
  42
  43 /*
  44  * The UART device described by the SPCR table is the only object which needs
  45  * special-casing. Everything else is covered by ACPI namespace paths in STAO
  46  * table.
  47  */
  48 static u64 spcr_uart_addr;
  49
  50 struct acpi_dep_data {
  51         struct list_head node;
  52         acpi_handle supplier;
  53         acpi_handle consumer;
  54 };
  55
  56 void acpi_scan_lock_acquire(void)
  57 {
  58         mutex_lock(&acpi_scan_lock);
  59 }
  60 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  61
  62 void acpi_scan_lock_release(void)
  63 {
  64         mutex_unlock(&acpi_scan_lock);
  65 }
  66 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  67
  68 void acpi_lock_hp_context(void)
  69 {
  70         mutex_lock(&acpi_hp_context_lock);
  71 }
  72
  73 void acpi_unlock_hp_context(void)
  74 {
  75         mutex_unlock(&acpi_hp_context_lock);
  76 }
  77
  78 void acpi_initialize_hp_context(struct acpi_device *adev,
  79                                 struct acpi_hotplug_context *hp,
  80                                 int (*notify)(struct acpi_device *, u32),
  81                                 void (*uevent)(struct acpi_device *, u32))
  82 {
  83         acpi_lock_hp_context();
  84         hp->notify = notify;
  85         hp->uevent = uevent;
  86         acpi_set_hp_context(adev, hp);
  87         acpi_unlock_hp_context();
  88 }
  89 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
  90
  91 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  92 {
  93         if (!handler)
  94                 return -EINVAL;
  95
  96         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  97         return 0;
  98 }
  99
 100 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
 101                                        const char *hotplug_profile_name)
 102 {
 103         int error;
 104
 105         error = acpi_scan_add_handler(handler);
 106         if (error)
 107                 return error;
 108
 109         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
 110         return 0;
 111 }
 112
 113 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 114 {
 115         struct acpi_device_physical_node *pn;
 116         bool offline = true;
 117         char *envp[] = { "EVENT=offline", NULL };
 118
 119         /*
 120          * acpi_container_offline() calls this for all of the container's
 121          * children under the container's physical_node_lock lock.
 122          */
 123         mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
 124
 125         list_for_each_entry(pn, &adev->physical_node_list, node)
 126                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
 127                         if (uevent)
 128                                 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
 129
 130                         offline = false;
 131                         break;
 132                 }
 133
 134         mutex_unlock(&adev->physical_node_lock);
 135         return offline;
 136 }
 137
 138 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 139                                     void **ret_p)
 140 {
 141         struct acpi_device *device = NULL;
 142         struct acpi_device_physical_node *pn;
 143         bool second_pass = (bool)data;
 144         acpi_status status = AE_OK;
 145
 146         if (acpi_bus_get_device(handle, &device))
 147                 return AE_OK;
 148
 149         if (device->handler && !device->handler->hotplug.enabled) {
 150                 *ret_p = &device->dev;
 151                 return AE_SUPPORT;
 152         }
 153
 154         mutex_lock(&device->physical_node_lock);
 155
 156         list_for_each_entry(pn, &device->physical_node_list, node) {
 157                 int ret;
 158
 159                 if (second_pass) {
 160                         /* Skip devices offlined by the first pass. */
 161                         if (pn->put_online)
 162                                 continue;
 163                 } else {
 164                         pn->put_online = false;
 165                 }
 166                 ret = device_offline(pn->dev);
 167                 if (ret >= 0) {
 168                         pn->put_online = !ret;
 169                 } else {
 170                         *ret_p = pn->dev;
 171                         if (second_pass) {
 172                                 status = AE_ERROR;
 173                                 break;
 174                         }
 175                 }
 176         }
 177
 178         mutex_unlock(&device->physical_node_lock);
 179
 180         return status;
 181 }
 182
 183 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 184                                    void **ret_p)
 185 {
 186         struct acpi_device *device = NULL;
 187         struct acpi_device_physical_node *pn;
 188
 189         if (acpi_bus_get_device(handle, &device))
 190                 return AE_OK;
 191
 192         mutex_lock(&device->physical_node_lock);
 193
 194         list_for_each_entry(pn, &device->physical_node_list, node)
 195                 if (pn->put_online) {
 196                         device_online(pn->dev);
 197                         pn->put_online = false;
 198                 }
 199
 200         mutex_unlock(&device->physical_node_lock);
 201
 202         return AE_OK;
 203 }
 204
 205 static int acpi_scan_try_to_offline(struct acpi_device *device)
 206 {
 207         acpi_handle handle = device->handle;
 208         struct device *errdev = NULL;
 209         acpi_status status;
 210
 211         /*
 212          * Carry out two passes here and ignore errors in the first pass,
 213          * because if the devices in question are memory blocks and
 214          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 215          * that the other blocks depend on, but it is not known in advance which
 216          * block holds them.
 217          *
 218          * If the first pass is successful, the second one isn't needed, though.
 219          */
 220         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 221                                      NULL, acpi_bus_offline, (void *)false,
 222                                      (void **)&errdev);
 223         if (status == AE_SUPPORT) {
 224                 dev_warn(errdev, "Offline disabled.\n");
 225                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 226                                     acpi_bus_online, NULL, NULL, NULL);
 227                 return -EPERM;
 228         }
 229         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
 230         if (errdev) {
 231                 errdev = NULL;
 232                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 233                                     NULL, acpi_bus_offline, (void *)true,
 234                                     (void **)&errdev);
 235                 if (!errdev)
 236                         acpi_bus_offline(handle, 0, (void *)true,
 237                                          (void **)&errdev);
 238
 239                 if (errdev) {
 240                         dev_warn(errdev, "Offline failed.\n");
 241                         acpi_bus_online(handle, 0, NULL, NULL);
 242                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 243                                             ACPI_UINT32_MAX, acpi_bus_online,
 244                                             NULL, NULL, NULL);
 245                         return -EBUSY;
 246                 }
 247         }
 248         return 0;
 249 }
 250
 251 static int acpi_scan_hot_remove(struct acpi_device *device)
 252 {
 253         acpi_handle handle = device->handle;
 254         unsigned long long sta;
 255         acpi_status status;
 256
 257         if (device->handler && device->handler->hotplug.demand_offline) {
 258                 if (!acpi_scan_is_offline(device, true))
 259                         return -EBUSY;
 260         } else {
 261                 int error = acpi_scan_try_to_offline(device);
 262                 if (error)
 263                         return error;
 264         }
 265
 266         acpi_handle_debug(handle, "Ejecting\n");
 267
 268         acpi_bus_trim(device);
 269
 270         acpi_evaluate_lck(handle, 0);
 271         /*
 272          * TBD: _EJD support.
 273          */
 274         status = acpi_evaluate_ej0(handle);
 275         if (status == AE_NOT_FOUND)
 276                 return -ENODEV;
 277         else if (ACPI_FAILURE(status))
 278                 return -EIO;
 279
 280         /*
 281          * Verify if eject was indeed successful.  If not, log an error
 282          * message.  No need to call _OST since _EJ0 call was made OK.
 283          */
 284         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 285         if (ACPI_FAILURE(status)) {
 286                 acpi_handle_warn(handle,
 287                         "Status check after eject failed (0x%x)\n", status);
 288         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 289                 acpi_handle_warn(handle,
 290                         "Eject incomplete - status 0x%llx\n", sta);
 291         }
 292
 293         return 0;
 294 }
 295
 296 static int acpi_scan_device_not_present(struct acpi_device *adev)
 297 {
 298         if (!acpi_device_enumerated(adev)) {
 299                 dev_warn(&adev->dev, "Still not present\n");
 300                 return -EALREADY;
 301         }
 302         acpi_bus_trim(adev);
 303         return 0;
 304 }
 305
 306 static int acpi_scan_device_check(struct acpi_device *adev)
 307 {
 308         int error;
 309
 310         acpi_bus_get_status(adev);
 311         if (adev->status.present || adev->status.functional) {
 312                 /*
 313                  * This function is only called for device objects for which
 314                  * matching scan handlers exist.  The only situation in which
 315                  * the scan handler is not attached to this device object yet
 316                  * is when the device has just appeared (either it wasn't
 317                  * present at all before or it was removed and then added
 318                  * again).
 319                  */
 320                 if (adev->handler) {
 321                         dev_warn(&adev->dev, "Already enumerated\n");
 322                         return -EALREADY;
 323                 }
 324                 error = acpi_bus_scan(adev->handle);
 325                 if (error) {
 326                         dev_warn(&adev->dev, "Namespace scan failure\n");
 327                         return error;
 328                 }
 329                 if (!adev->handler) {
 330                         dev_warn(&adev->dev, "Enumeration failure\n");
 331                         error = -ENODEV;
 332                 }
 333         } else {
 334                 error = acpi_scan_device_not_present(adev);
 335         }
 336         return error;
 337 }
 338
 339 static int acpi_scan_bus_check(struct acpi_device *adev)
 340 {
 341         struct acpi_scan_handler *handler = adev->handler;
 342         struct acpi_device *child;
 343         int error;
 344
 345         acpi_bus_get_status(adev);
 346         if (!(adev->status.present || adev->status.functional)) {
 347                 acpi_scan_device_not_present(adev);
 348                 return 0;
 349         }
 350         if (handler && handler->hotplug.scan_dependent)
 351                 return handler->hotplug.scan_dependent(adev);
 352
 353         error = acpi_bus_scan(adev->handle);
 354         if (error) {
 355                 dev_warn(&adev->dev, "Namespace scan failure\n");
 356                 return error;
 357         }
 358         list_for_each_entry(child, &adev->children, node) {
 359                 error = acpi_scan_bus_check(child);
 360                 if (error)
 361                         return error;
 362         }
 363         return 0;
 364 }
 365
 366 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 367 {
 368         switch (type) {
 369         case ACPI_NOTIFY_BUS_CHECK:
 370                 return acpi_scan_bus_check(adev);
 371         case ACPI_NOTIFY_DEVICE_CHECK:
 372                 return acpi_scan_device_check(adev);
 373         case ACPI_NOTIFY_EJECT_REQUEST:
 374         case ACPI_OST_EC_OSPM_EJECT:
 375                 if (adev->handler && !adev->handler->hotplug.enabled) {
 376                         dev_info(&adev->dev, "Eject disabled\n");
 377                         return -EPERM;
 378                 }
 379                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 380                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 381                 return acpi_scan_hot_remove(adev);
 382         }
 383         return -EINVAL;
 384 }
 385
 386 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 387 {
 388         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 389         int error = -ENODEV;
 390
 391         lock_device_hotplug();
 392         mutex_lock(&acpi_scan_lock);
 393
 394         /*
 395          * The device object's ACPI handle cannot become invalid as long as we
 396          * are holding acpi_scan_lock, but it might have become invalid before
 397          * that lock was acquired.
 398          */
 399         if (adev->handle == INVALID_ACPI_HANDLE)
 400                 goto err_out;
 401
 402         if (adev->flags.is_dock_station) {
 403                 error = dock_notify(adev, src);
 404         } else if (adev->flags.hotplug_notify) {
 405                 error = acpi_generic_hotplug_event(adev, src);
 406         } else {
 407                 int (*notify)(struct acpi_device *, u32);
 408
 409                 acpi_lock_hp_context();
 410                 notify = adev->hp ? adev->hp->notify : NULL;
 411                 acpi_unlock_hp_context();
 412                 /*
 413                  * There may be additional notify handlers for device objects
 414                  * without the .event() callback, so ignore them here.
 415                  */
 416                 if (notify)
 417                         error = notify(adev, src);
 418                 else
 419                         goto out;
 420         }
 421         switch (error) {
 422         case 0:
 423                 ost_code = ACPI_OST_SC_SUCCESS;
 424                 break;
 425         case -EPERM:
 426                 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 427                 break;
 428         case -EBUSY:
 429                 ost_code = ACPI_OST_SC_DEVICE_BUSY;
 430                 break;
 431         default:
 432                 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 433                 break;
 434         }
 435
 436  err_out:
 437         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 438
 439  out:
 440         acpi_bus_put_acpi_device(adev);
 441         mutex_unlock(&acpi_scan_lock);
 442         unlock_device_hotplug();
 443 }
 444
 445 static void acpi_free_power_resources_lists(struct acpi_device *device)
 446 {
 447         int i;
 448
 449         if (device->wakeup.flags.valid)
 450                 acpi_power_resources_list_free(&device->wakeup.resources);
 451
 452         if (!device->power.flags.power_resources)
 453                 return;
 454
 455         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 456                 struct acpi_device_power_state *ps = &device->power.states[i];
 457                 acpi_power_resources_list_free(&ps->resources);
 458         }
 459 }
 460
 461 static void acpi_device_release(struct device *dev)
 462 {
 463         struct acpi_device *acpi_dev = to_acpi_device(dev);
 464
 465         acpi_free_properties(acpi_dev);
 466         acpi_free_pnp_ids(&acpi_dev->pnp);
 467         acpi_free_power_resources_lists(acpi_dev);
 468         kfree(acpi_dev);
 469 }
 470
 471 static void acpi_device_del(struct acpi_device *device)
 472 {
 473         struct acpi_device_bus_id *acpi_device_bus_id;
 474
 475         mutex_lock(&acpi_device_lock);
 476         if (device->parent)
 477                 list_del(&device->node);
 478
 479         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
 480                 if (!strcmp(acpi_device_bus_id->bus_id,
 481                             acpi_device_hid(device))) {
 482                         if (acpi_device_bus_id->instance_no > 0)
 483                                 acpi_device_bus_id->instance_no--;
 484                         else {
 485                                 list_del(&acpi_device_bus_id->node);
 486                                 kfree_const(acpi_device_bus_id->bus_id);
 487                                 kfree(acpi_device_bus_id);
 488                         }
 489                         break;
 490                 }
 491
 492         list_del(&device->wakeup_list);
 493         mutex_unlock(&acpi_device_lock);
 494
 495         acpi_power_add_remove_device(device, false);
 496         acpi_device_remove_files(device);
 497         if (device->remove)
 498                 device->remove(device);
 499
 500         device_del(&device->dev);
 501 }
 502
 503 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
 504
 505 static LIST_HEAD(acpi_device_del_list);
 506 static DEFINE_MUTEX(acpi_device_del_lock);
 507
 508 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 509 {
 510         for (;;) {
 511                 struct acpi_device *adev;
 512
 513                 mutex_lock(&acpi_device_del_lock);
 514
 515                 if (list_empty(&acpi_device_del_list)) {
 516                         mutex_unlock(&acpi_device_del_lock);
 517                         break;
 518                 }
 519                 adev = list_first_entry(&acpi_device_del_list,
 520                                         struct acpi_device, del_list);
 521                 list_del(&adev->del_list);
 522
 523                 mutex_unlock(&acpi_device_del_lock);
 524
 525                 blocking_notifier_call_chain(&acpi_reconfig_chain,
 526                                              ACPI_RECONFIG_DEVICE_REMOVE, adev);
 527
 528                 acpi_device_del(adev);
 529                 /*
 530                  * Drop references to all power resources that might have been
 531                  * used by the device.
 532                  */
 533                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
 534                 put_device(&adev->dev);
 535         }
 536 }
 537
 538 /**
 539  * acpi_scan_drop_device - Drop an ACPI device object.
 540  * @handle: Handle of an ACPI namespace node, not used.
 541  * @context: Address of the ACPI device object to drop.
 542  *
 543  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
 544  * namespace node the device object pointed to by @context is attached to.
 545  *
 546  * The unregistration is carried out asynchronously to avoid running
 547  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
 548  * ensure the correct ordering (the device objects must be unregistered in the
 549  * same order in which the corresponding namespace nodes are deleted).
 550  */
 551 static void acpi_scan_drop_device(acpi_handle handle, void *context)
 552 {
 553         static DECLARE_WORK(work, acpi_device_del_work_fn);
 554         struct acpi_device *adev = context;
 555
 556         mutex_lock(&acpi_device_del_lock);
 557
 558         /*
 559          * Use the ACPI hotplug workqueue which is ordered, so this work item
 560          * won't run after any hotplug work items submitted subsequently.  That
 561          * prevents attempts to register device objects identical to those being
 562          * deleted from happening concurrently (such attempts result from
 563          * hotplug events handled via the ACPI hotplug workqueue).  It also will
 564          * run after all of the work items submitted previosuly, which helps
 565          * those work items to ensure that they are not accessing stale device
 566          * objects.
 567          */
 568         if (list_empty(&acpi_device_del_list))
 569                 acpi_queue_hotplug_work(&work);
 570
 571         list_add_tail(&adev->del_list, &acpi_device_del_list);
 572         /* Make acpi_ns_validate_handle() return NULL for this handle. */
 573         adev->handle = INVALID_ACPI_HANDLE;
 574
 575         mutex_unlock(&acpi_device_del_lock);
 576 }
 577
 578 static struct acpi_device *handle_to_device(acpi_handle handle,
 579                                             void (*callback)(void *))
 580 {
 581         struct acpi_device *adev = NULL;
 582         acpi_status status;
 583
 584         status = acpi_get_data_full(handle, acpi_scan_drop_device,
 585                                     (void **)&adev, callback);
 586         if (ACPI_FAILURE(status) || !adev) {
 587                 acpi_handle_debug(handle, "No context!\n");
 588                 return NULL;
 589         }
 590         return adev;
 591 }
 592
 593 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 594 {
 595         if (!device)
 596                 return -EINVAL;
 597
 598         *device = handle_to_device(handle, NULL);
 599         if (!*device)
 600                 return -ENODEV;
 601
 602         return 0;
 603 }
 604 EXPORT_SYMBOL(acpi_bus_get_device);
 605
 606 static void get_acpi_device(void *dev)
 607 {
 608         if (dev)
 609                 get_device(&((struct acpi_device *)dev)->dev);
 610 }
 611
 612 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 613 {
 614         return handle_to_device(handle, get_acpi_device);
 615 }
 616
 617 void acpi_bus_put_acpi_device(struct acpi_device *adev)
 618 {
 619         put_device(&adev->dev);
 620 }
 621
 622 static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
 623 {
 624         struct acpi_device_bus_id *acpi_device_bus_id;
 625
 626         /* Find suitable bus_id and instance number in acpi_bus_id_list. */
 627         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 628                 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
 629                         return acpi_device_bus_id;
 630         }
 631         return NULL;
 632 }
 633
 634 int acpi_device_add(struct acpi_device *device,
 635                     void (*release)(struct device *))
 636 {
 637         struct acpi_device_bus_id *acpi_device_bus_id;
 638         int result;
 639
 640         if (device->handle) {
 641                 acpi_status status;
 642
 643                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
 644                                           device);
 645                 if (ACPI_FAILURE(status)) {
 646                         acpi_handle_err(device->handle,
 647                                         "Unable to attach device data\n");
 648                         return -ENODEV;
 649                 }
 650         }
 651
 652         /*
 653          * Linkage
 654          * -------
 655          * Link this device to its parent and siblings.
 656          */
 657         INIT_LIST_HEAD(&device->children);
 658         INIT_LIST_HEAD(&device->node);
 659         INIT_LIST_HEAD(&device->wakeup_list);
 660         INIT_LIST_HEAD(&device->physical_node_list);
 661         INIT_LIST_HEAD(&device->del_list);
 662         mutex_init(&device->physical_node_lock);
 663
 664         mutex_lock(&acpi_device_lock);
 665
 666         acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
 667         if (acpi_device_bus_id) {
 668                 acpi_device_bus_id->instance_no++;
 669         } else {
 670                 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
 671                                              GFP_KERNEL);
 672                 if (!acpi_device_bus_id) {
 673                         result = -ENOMEM;
 674                         goto err_unlock;
 675                 }
 676                 acpi_device_bus_id->bus_id =
 677                         kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
 678                 if (!acpi_device_bus_id->bus_id) {
 679                         kfree(acpi_device_bus_id);
 680                         result = -ENOMEM;
 681                         goto err_unlock;
 682                 }
 683
 684                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 685         }
 686         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 687
 688         if (device->parent)
 689                 list_add_tail(&device->node, &device->parent->children);
 690
 691         if (device->wakeup.flags.valid)
 692                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 693
 694         mutex_unlock(&acpi_device_lock);
 695
 696         if (device->parent)
 697                 device->dev.parent = &device->parent->dev;
 698
 699         device->dev.bus = &acpi_bus_type;
 700         device->dev.release = release;
 701         result = device_add(&device->dev);
 702         if (result) {
 703                 dev_err(&device->dev, "Error registering device\n");
 704                 goto err;
 705         }
 706
 707         result = acpi_device_setup_files(device);
 708         if (result)
 709                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 710                        dev_name(&device->dev));
 711
 712         return 0;
 713
 714 err:
 715         mutex_lock(&acpi_device_lock);
 716
 717         if (device->parent)
 718                 list_del(&device->node);
 719
 720         list_del(&device->wakeup_list);
 721
 722 err_unlock:
 723         mutex_unlock(&acpi_device_lock);
 724
 725         acpi_detach_data(device->handle, acpi_scan_drop_device);
 726
 727         return result;
 728 }
 729
 730 /* --------------------------------------------------------------------------
 731                                  Device Enumeration
 732    -------------------------------------------------------------------------- */
 733 static bool acpi_info_matches_ids(struct acpi_device_info *info,
 734                                   const char * const ids[])
 735 {
 736         struct acpi_pnp_device_id_list *cid_list = NULL;
 737         int i;
 738
 739         if (!(info->valid & ACPI_VALID_HID))
 740                 return false;
 741
 742         if (info->valid & ACPI_VALID_CID)
 743                 cid_list = &info->compatible_id_list;
 744
 745         for (i = 0; ids[i]; i++) {
 746                 int j;
 747
 748                 if (!strcmp(info->hardware_id.string, ids[i]))
 749                         return true;
 750
 751                 if (!cid_list)
 752                         continue;
 753
 754                 for (j = 0; j < cid_list->count; j++) {
 755                         if (!strcmp(cid_list->ids[j].string, ids[i]))
 756                                 return true;
 757                 }
 758         }
 759
 760         return false;
 761 }
 762
 763 /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
 764 static const char * const acpi_ignore_dep_ids[] = {
 765         "PNP0D80", /* Windows-compatible System Power Management Controller */
 766         "INT33BD", /* Intel Baytrail Mailbox Device */
 767         NULL
 768 };
 769
 770 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 771 {
 772         struct acpi_device *device = NULL;
 773         acpi_status status;
 774
 775         /*
 776          * Fixed hardware devices do not appear in the namespace and do not
 777          * have handles, but we fabricate acpi_devices for them, so we have
 778          * to deal with them specially.
 779          */
 780         if (!handle)
 781                 return acpi_root;
 782
 783         do {
 784                 status = acpi_get_parent(handle, &handle);
 785                 if (ACPI_FAILURE(status))
 786                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 787         } while (acpi_bus_get_device(handle, &device));
 788         return device;
 789 }
 790
 791 acpi_status
 792 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 793 {
 794         acpi_status status;
 795         acpi_handle tmp;
 796         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 797         union acpi_object *obj;
 798
 799         status = acpi_get_handle(handle, "_EJD", &tmp);
 800         if (ACPI_FAILURE(status))
 801                 return status;
 802
 803         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 804         if (ACPI_SUCCESS(status)) {
 805                 obj = buffer.pointer;
 806                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 807                                          ejd);
 808                 kfree(buffer.pointer);
 809         }
 810         return status;
 811 }
 812 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 813
 814 static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
 815 {
 816         acpi_handle handle = dev->handle;
 817         struct acpi_device_wakeup *wakeup = &dev->wakeup;
 818         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 819         union acpi_object *package = NULL;
 820         union acpi_object *element = NULL;
 821         acpi_status status;
 822         int err = -ENODATA;
 823
 824         INIT_LIST_HEAD(&wakeup->resources);
 825
 826         /* _PRW */
 827         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 828         if (ACPI_FAILURE(status)) {
 829                 acpi_handle_info(handle, "_PRW evaluation failed: %s\n",
 830                                  acpi_format_exception(status));
 831                 return err;
 832         }
 833
 834         package = (union acpi_object *)buffer.pointer;
 835
 836         if (!package || package->package.count < 2)
 837                 goto out;
 838
 839         element = &(package->package.elements[0]);
 840         if (!element)
 841                 goto out;
 842
 843         if (element->type == ACPI_TYPE_PACKAGE) {
 844                 if ((element->package.count < 2) ||
 845                     (element->package.elements[0].type !=
 846                      ACPI_TYPE_LOCAL_REFERENCE)
 847                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 848                         goto out;
 849
 850                 wakeup->gpe_device =
 851                     element->package.elements[0].reference.handle;
 852                 wakeup->gpe_number =
 853                     (u32) element->package.elements[1].integer.value;
 854         } else if (element->type == ACPI_TYPE_INTEGER) {
 855                 wakeup->gpe_device = NULL;
 856                 wakeup->gpe_number = element->integer.value;
 857         } else {
 858                 goto out;
 859         }
 860
 861         element = &(package->package.elements[1]);
 862         if (element->type != ACPI_TYPE_INTEGER)
 863                 goto out;
 864
 865         wakeup->sleep_state = element->integer.value;
 866
 867         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 868         if (err)
 869                 goto out;
 870
 871         if (!list_empty(&wakeup->resources)) {
 872                 int sleep_state;
 873
 874                 err = acpi_power_wakeup_list_init(&wakeup->resources,
 875                                                   &sleep_state);
 876                 if (err) {
 877                         acpi_handle_warn(handle, "Retrieving current states "
 878                                          "of wakeup power resources failed\n");
 879                         acpi_power_resources_list_free(&wakeup->resources);
 880                         goto out;
 881                 }
 882                 if (sleep_state < wakeup->sleep_state) {
 883                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
 884                                          "(S%d) by S%d from power resources\n",
 885                                          (int)wakeup->sleep_state, sleep_state);
 886                         wakeup->sleep_state = sleep_state;
 887                 }
 888         }
 889
 890  out:
 891         kfree(buffer.pointer);
 892         return err;
 893 }
 894
 895 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
 896 {
 897         static const struct acpi_device_id button_device_ids[] = {
 898                 {"PNP0C0C", 0},         /* Power button */
 899                 {"PNP0C0D", 0},         /* Lid */
 900                 {"PNP0C0E", 0},         /* Sleep button */
 901                 {"", 0},
 902         };
 903         struct acpi_device_wakeup *wakeup = &device->wakeup;
 904         acpi_status status;
 905
 906         wakeup->flags.notifier_present = 0;
 907
 908         /* Power button, Lid switch always enable wakeup */
 909         if (!acpi_match_device_ids(device, button_device_ids)) {
 910                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 911                         /* Do not use Lid/sleep button for S5 wakeup */
 912                         if (wakeup->sleep_state == ACPI_STATE_S5)
 913                                 wakeup->sleep_state = ACPI_STATE_S4;
 914                 }
 915                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 916                 device_set_wakeup_capable(&device->dev, true);
 917                 return true;
 918         }
 919
 920         status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 921                                          wakeup->gpe_number);
 922         return ACPI_SUCCESS(status);
 923 }
 924
 925 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 926 {
 927         int err;
 928
 929         /* Presence of _PRW indicates wake capable */
 930         if (!acpi_has_method(device->handle, "_PRW"))
 931                 return;
 932
 933         err = acpi_bus_extract_wakeup_device_power_package(device);
 934         if (err) {
 935                 dev_err(&device->dev, "Unable to extract wakeup power resources");
 936                 return;
 937         }
 938
 939         device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
 940         device->wakeup.prepare_count = 0;
 941         /*
 942          * Call _PSW/_DSW object to disable its ability to wake the sleeping
 943          * system for the ACPI device with the _PRW object.
 944          * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
 945          * So it is necessary to call _DSW object first. Only when it is not
 946          * present will the _PSW object used.
 947          */
 948         err = acpi_device_sleep_wake(device, 0, 0, 0);
 949         if (err)
 950                 pr_debug("error in _DSW or _PSW evaluation\n");
 951 }
 952
 953 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 954 {
 955         struct acpi_device_power_state *ps = &device->power.states[state];
 956         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 957         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 958         acpi_status status;
 959
 960         INIT_LIST_HEAD(&ps->resources);
 961
 962         /* Evaluate "_PRx" to get referenced power resources */
 963         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 964         if (ACPI_SUCCESS(status)) {
 965                 union acpi_object *package = buffer.pointer;
 966
 967                 if (buffer.length && package
 968                     && package->type == ACPI_TYPE_PACKAGE
 969                     && package->package.count)
 970                         acpi_extract_power_resources(package, 0, &ps->resources);
 971
 972                 ACPI_FREE(buffer.pointer);
 973         }
 974
 975         /* Evaluate "_PSx" to see if we can do explicit sets */
 976         pathname[2] = 'S';
 977         if (acpi_has_method(device->handle, pathname))
 978                 ps->flags.explicit_set = 1;
 979
 980         /* State is valid if there are means to put the device into it. */
 981         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
 982                 ps->flags.valid = 1;
 983
 984         ps->power = -1;         /* Unknown - driver assigned */
 985         ps->latency = -1;       /* Unknown - driver assigned */
 986 }
 987
 988 static void acpi_bus_get_power_flags(struct acpi_device *device)
 989 {
 990         u32 i;
 991
 992         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 993         if (!acpi_has_method(device->handle, "_PS0") &&
 994             !acpi_has_method(device->handle, "_PR0"))
 995                 return;
 996
 997         device->flags.power_manageable = 1;
 998
 999         /*
1000          * Power Management Flags
1001          */
1002         if (acpi_has_method(device->handle, "_PSC"))
1003                 device->power.flags.explicit_get = 1;
1004
1005         if (acpi_has_method(device->handle, "_IRC"))
1006                 device->power.flags.inrush_current = 1;
1007
1008         if (acpi_has_method(device->handle, "_DSW"))
1009                 device->power.flags.dsw_present = 1;
1010
1011         /*
1012          * Enumerate supported power management states
1013          */
1014         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1015                 acpi_bus_init_power_state(device, i);
1016
1017         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1018
1019         /* Set the defaults for D0 and D3hot (always supported). */
1020         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1021         device->power.states[ACPI_STATE_D0].power = 100;
1022         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1023
1024         /*
1025          * Use power resources only if the D0 list of them is populated, because
1026          * some platforms may provide _PR3 only to indicate D3cold support and
1027          * in those cases the power resources list returned by it may be bogus.
1028          */
1029         if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1030                 device->power.flags.power_resources = 1;
1031                 /*
1032                  * D3cold is supported if the D3hot list of power resources is
1033                  * not empty.
1034                  */
1035                 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1036                         device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1037         }
1038
1039         if (acpi_bus_init_power(device))
1040                 device->flags.power_manageable = 0;
1041 }
1042
1043 static void acpi_bus_get_flags(struct acpi_device *device)
1044 {
1045         /* Presence of _STA indicates 'dynamic_status' */
1046         if (acpi_has_method(device->handle, "_STA"))
1047                 device->flags.dynamic_status = 1;
1048
1049         /* Presence of _RMV indicates 'removable' */
1050         if (acpi_has_method(device->handle, "_RMV"))
1051                 device->flags.removable = 1;
1052
1053         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1054         if (acpi_has_method(device->handle, "_EJD") ||
1055             acpi_has_method(device->handle, "_EJ0"))
1056                 device->flags.ejectable = 1;
1057 }
1058
1059 static void acpi_device_get_busid(struct acpi_device *device)
1060 {
1061         char bus_id[5] = { '?', 0 };
1062         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1063         int i = 0;
1064
1065         /*
1066          * Bus ID
1067          * ------
1068          * The device's Bus ID is simply the object name.
1069          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1070          */
1071         if (ACPI_IS_ROOT_DEVICE(device)) {
1072                 strcpy(device->pnp.bus_id, "ACPI");
1073                 return;
1074         }
1075
1076         switch (device->device_type) {
1077         case ACPI_BUS_TYPE_POWER_BUTTON:
1078                 strcpy(device->pnp.bus_id, "PWRF");
1079                 break;
1080         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1081                 strcpy(device->pnp.bus_id, "SLPF");
1082                 break;
1083         case ACPI_BUS_TYPE_ECDT_EC:
1084                 strcpy(device->pnp.bus_id, "ECDT");
1085                 break;
1086         default:
1087                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1088                 /* Clean up trailing underscores (if any) */
1089                 for (i = 3; i > 1; i--) {
1090                         if (bus_id[i] == '_')
1091                                 bus_id[i] = '\0';
1092                         else
1093                                 break;
1094                 }
1095                 strcpy(device->pnp.bus_id, bus_id);
1096                 break;
1097         }
1098 }
1099
1100 /*
1101  * acpi_ata_match - see if an acpi object is an ATA device
1102  *
1103  * If an acpi object has one of the ACPI ATA methods defined,
1104  * then we can safely call it an ATA device.
1105  */
1106 bool acpi_ata_match(acpi_handle handle)
1107 {
1108         return acpi_has_method(handle, "_GTF") ||
1109                acpi_has_method(handle, "_GTM") ||
1110                acpi_has_method(handle, "_STM") ||
1111                acpi_has_method(handle, "_SDD");
1112 }
1113
1114 /*
1115  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1116  *
1117  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1118  * then we can safely call it an ejectable drive bay
1119  */
1120 bool acpi_bay_match(acpi_handle handle)
1121 {
1122         acpi_handle phandle;
1123
1124         if (!acpi_has_method(handle, "_EJ0"))
1125                 return false;
1126         if (acpi_ata_match(handle))
1127                 return true;
1128         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1129                 return false;
1130
1131         return acpi_ata_match(phandle);
1132 }
1133
1134 bool acpi_device_is_battery(struct acpi_device *adev)
1135 {
1136         struct acpi_hardware_id *hwid;
1137
1138         list_for_each_entry(hwid, &adev->pnp.ids, list)
1139                 if (!strcmp("PNP0C0A", hwid->id))
1140                         return true;
1141
1142         return false;
1143 }
1144
1145 static bool is_ejectable_bay(struct acpi_device *adev)
1146 {
1147         acpi_handle handle = adev->handle;
1148
1149         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1150                 return true;
1151
1152         return acpi_bay_match(handle);
1153 }
1154
1155 /*
1156  * acpi_dock_match - see if an acpi object has a _DCK method
1157  */
1158 bool acpi_dock_match(acpi_handle handle)
1159 {
1160         return acpi_has_method(handle, "_DCK");
1161 }
1162
1163 static acpi_status
1164 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1165                           void **return_value)
1166 {
1167         long *cap = context;
1168
1169         if (acpi_has_method(handle, "_BCM") &&
1170             acpi_has_method(handle, "_BCL")) {
1171                 acpi_handle_debug(handle, "Found generic backlight support\n");
1172                 *cap |= ACPI_VIDEO_BACKLIGHT;
1173                 /* We have backlight support, no need to scan further */
1174                 return AE_CTRL_TERMINATE;
1175         }
1176         return 0;
1177 }
1178
1179 /* Returns true if the ACPI object is a video device which can be
1180  * handled by video.ko.
1181  * The device will get a Linux specific CID added in scan.c to
1182  * identify the device as an ACPI graphics device
1183  * Be aware that the graphics device may not be physically present
1184  * Use acpi_video_get_capabilities() to detect general ACPI video
1185  * capabilities of present cards
1186  */
1187 long acpi_is_video_device(acpi_handle handle)
1188 {
1189         long video_caps = 0;
1190
1191         /* Is this device able to support video switching ? */
1192         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1193                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1194
1195         /* Is this device able to retrieve a video ROM ? */
1196         if (acpi_has_method(handle, "_ROM"))
1197                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1198
1199         /* Is this device able to configure which video head to be POSTed ? */
1200         if (acpi_has_method(handle, "_VPO") &&
1201             acpi_has_method(handle, "_GPD") &&
1202             acpi_has_method(handle, "_SPD"))
1203                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1204
1205         /* Only check for backlight functionality if one of the above hit. */
1206         if (video_caps)
1207                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1208                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1209                                     &video_caps, NULL);
1210
1211         return video_caps;
1212 }
1213 EXPORT_SYMBOL(acpi_is_video_device);
1214
1215 const char *acpi_device_hid(struct acpi_device *device)
1216 {
1217         struct acpi_hardware_id *hid;
1218
1219         if (list_empty(&device->pnp.ids))
1220                 return dummy_hid;
1221
1222         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1223         return hid->id;
1224 }
1225 EXPORT_SYMBOL(acpi_device_hid);
1226
1227 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1228 {
1229         struct acpi_hardware_id *id;
1230
1231         id = kmalloc(sizeof(*id), GFP_KERNEL);
1232         if (!id)
1233                 return;
1234
1235         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1236         if (!id->id) {
1237                 kfree(id);
1238                 return;
1239         }
1240
1241         list_add_tail(&id->list, &pnp->ids);
1242         pnp->type.hardware_id = 1;
1243 }
1244
1245 /*
1246  * Old IBM workstations have a DSDT bug wherein the SMBus object
1247  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1248  * prefix.  Work around this.
1249  */
1250 static bool acpi_ibm_smbus_match(acpi_handle handle)
1251 {
1252         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1253         struct acpi_buffer path = { sizeof(node_name), node_name };
1254
1255         if (!dmi_name_in_vendors("IBM"))
1256                 return false;
1257
1258         /* Look for SMBS object */
1259         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1260             strcmp("SMBS", path.pointer))
1261                 return false;
1262
1263         /* Does it have the necessary (but misnamed) methods? */
1264         if (acpi_has_method(handle, "SBI") &&
1265             acpi_has_method(handle, "SBR") &&
1266             acpi_has_method(handle, "SBW"))
1267                 return true;
1268
1269         return false;
1270 }
1271
1272 static bool acpi_object_is_system_bus(acpi_handle handle)
1273 {
1274         acpi_handle tmp;
1275
1276         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1277             tmp == handle)
1278                 return true;
1279         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1280             tmp == handle)
1281                 return true;
1282
1283         return false;
1284 }
1285
1286 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1287                                 int device_type, struct acpi_device_info *info)
1288 {
1289         struct acpi_pnp_device_id_list *cid_list;
1290         int i;
1291
1292         switch (device_type) {
1293         case ACPI_BUS_TYPE_DEVICE:
1294                 if (handle == ACPI_ROOT_OBJECT) {
1295                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1296                         break;
1297                 }
1298
1299                 if (!info) {
1300                         pr_err(PREFIX "%s: Error reading device info\n",
1301                                         __func__);
1302                         return;
1303                 }
1304
1305                 if (info->valid & ACPI_VALID_HID) {
1306                         acpi_add_id(pnp, info->hardware_id.string);
1307                         pnp->type.platform_id = 1;
1308                 }
1309                 if (info->valid & ACPI_VALID_CID) {
1310                         cid_list = &info->compatible_id_list;
1311                         for (i = 0; i < cid_list->count; i++)
1312                                 acpi_add_id(pnp, cid_list->ids[i].string);
1313                 }
1314                 if (info->valid & ACPI_VALID_ADR) {
1315                         pnp->bus_address = info->address;
1316                         pnp->type.bus_address = 1;
1317                 }
1318                 if (info->valid & ACPI_VALID_UID)
1319                         pnp->unique_id = kstrdup(info->unique_id.string,
1320                                                         GFP_KERNEL);
1321                 if (info->valid & ACPI_VALID_CLS)
1322                         acpi_add_id(pnp, info->class_code.string);
1323
1324                 /*
1325                  * Some devices don't reliably have _HIDs & _CIDs, so add
1326                  * synthetic HIDs to make sure drivers can find them.
1327                  */
1328                 if (acpi_is_video_device(handle))
1329                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1330                 else if (acpi_bay_match(handle))
1331                         acpi_add_id(pnp, ACPI_BAY_HID);
1332                 else if (acpi_dock_match(handle))
1333                         acpi_add_id(pnp, ACPI_DOCK_HID);
1334                 else if (acpi_ibm_smbus_match(handle))
1335                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1336                 else if (list_empty(&pnp->ids) &&
1337                          acpi_object_is_system_bus(handle)) {
1338                         /* \_SB, \_TZ, LNXSYBUS */
1339                         acpi_add_id(pnp, ACPI_BUS_HID);
1340                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1341                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1342                 }
1343
1344                 break;
1345         case ACPI_BUS_TYPE_POWER:
1346                 acpi_add_id(pnp, ACPI_POWER_HID);
1347                 break;
1348         case ACPI_BUS_TYPE_PROCESSOR:
1349                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1350                 break;
1351         case ACPI_BUS_TYPE_THERMAL:
1352                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1353                 break;
1354         case ACPI_BUS_TYPE_POWER_BUTTON:
1355                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1356                 break;
1357         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1358                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1359                 break;
1360         case ACPI_BUS_TYPE_ECDT_EC:
1361                 acpi_add_id(pnp, ACPI_ECDT_HID);
1362                 break;
1363         }
1364 }
1365
1366 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1367 {
1368         struct acpi_hardware_id *id, *tmp;
1369
1370         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1371                 kfree_const(id->id);
1372                 kfree(id);
1373         }
1374         kfree(pnp->unique_id);
1375 }
1376
1377 /**
1378  * acpi_dma_supported - Check DMA support for the specified device.
1379  * @adev: The pointer to acpi device
1380  *
1381  * Return false if DMA is not supported. Otherwise, return true
1382  */
1383 bool acpi_dma_supported(struct acpi_device *adev)
1384 {
1385         if (!adev)
1386                 return false;
1387
1388         if (adev->flags.cca_seen)
1389                 return true;
1390
1391         /*
1392         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1393         * DMA on "Intel platforms".  Presumably that includes all x86 and
1394         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1395         */
1396         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1397                 return true;
1398
1399         return false;
1400 }
1401
1402 /**
1403  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1404  * @adev: The pointer to acpi device
1405  *
1406  * Return enum dev_dma_attr.
1407  */
1408 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1409 {
1410         if (!acpi_dma_supported(adev))
1411                 return DEV_DMA_NOT_SUPPORTED;
1412
1413         if (adev->flags.coherent_dma)
1414                 return DEV_DMA_COHERENT;
1415         else
1416                 return DEV_DMA_NON_COHERENT;
1417 }
1418
1419 /**
1420  * acpi_dma_get_range() - Get device DMA parameters.
1421  *
1422  * @dev: device to configure
1423  * @dma_addr: pointer device DMA address result
1424  * @offset: pointer to the DMA offset result
1425  * @size: pointer to DMA range size result
1426  *
1427  * Evaluate DMA regions and return respectively DMA region start, offset
1428  * and size in dma_addr, offset and size on parsing success; it does not
1429  * update the passed in values on failure.
1430  *
1431  * Return 0 on success, < 0 on failure.
1432  */
1433 int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1434                        u64 *size)
1435 {
1436         struct acpi_device *adev;
1437         LIST_HEAD(list);
1438         struct resource_entry *rentry;
1439         int ret;
1440         struct device *dma_dev = dev;
1441         u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1442
1443         /*
1444          * Walk the device tree chasing an ACPI companion with a _DMA
1445          * object while we go. Stop if we find a device with an ACPI
1446          * companion containing a _DMA method.
1447          */
1448         do {
1449                 adev = ACPI_COMPANION(dma_dev);
1450                 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1451                         break;
1452
1453                 dma_dev = dma_dev->parent;
1454         } while (dma_dev);
1455
1456         if (!dma_dev)
1457                 return -ENODEV;
1458
1459         if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1460                 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1461                 return -EINVAL;
1462         }
1463
1464         ret = acpi_dev_get_dma_resources(adev, &list);
1465         if (ret > 0) {
1466                 list_for_each_entry(rentry, &list, node) {
1467                         if (dma_offset && rentry->offset != dma_offset) {
1468                                 ret = -EINVAL;
1469                                 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1470                                 goto out;
1471                         }
1472                         dma_offset = rentry->offset;
1473
1474                         /* Take lower and upper limits */
1475                         if (rentry->res->start < dma_start)
1476                                 dma_start = rentry->res->start;
1477                         if (rentry->res->end > dma_end)
1478                                 dma_end = rentry->res->end;
1479                 }
1480
1481                 if (dma_start >= dma_end) {
1482                         ret = -EINVAL;
1483                         dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1484                         goto out;
1485                 }
1486
1487                 *dma_addr = dma_start - dma_offset;
1488                 len = dma_end - dma_start;
1489                 *size = max(len, len + 1);
1490                 *offset = dma_offset;
1491         }
1492  out:
1493         acpi_dev_free_resource_list(&list);
1494
1495         return ret >= 0 ? 0 : ret;
1496 }
1497
1498 /**
1499  * acpi_dma_configure_id - Set-up DMA configuration for the device.
1500  * @dev: The pointer to the device
1501  * @attr: device dma attributes
1502  * @input_id: input device id const value pointer
1503  */
1504 int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1505                           const u32 *input_id)
1506 {
1507         const struct iommu_ops *iommu;
1508         u64 dma_addr = 0, size = 0;
1509
1510         if (attr == DEV_DMA_NOT_SUPPORTED) {
1511                 set_dma_ops(dev, &dma_dummy_ops);
1512                 return 0;
1513         }
1514
1515         iort_dma_setup(dev, &dma_addr, &size);
1516
1517         iommu = iort_iommu_configure_id(dev, input_id);
1518         if (PTR_ERR(iommu) == -EPROBE_DEFER)
1519                 return -EPROBE_DEFER;
1520
1521         arch_setup_dma_ops(dev, dma_addr, size,
1522                                 iommu, attr == DEV_DMA_COHERENT);
1523
1524         return 0;
1525 }
1526 EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1527
1528 static void acpi_init_coherency(struct acpi_device *adev)
1529 {
1530         unsigned long long cca = 0;
1531         acpi_status status;
1532         struct acpi_device *parent = adev->parent;
1533
1534         if (parent && parent->flags.cca_seen) {
1535                 /*
1536                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1537                  * already saw one.
1538                  */
1539                 adev->flags.cca_seen = 1;
1540                 cca = parent->flags.coherent_dma;
1541         } else {
1542                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1543                                                NULL, &cca);
1544                 if (ACPI_SUCCESS(status))
1545                         adev->flags.cca_seen = 1;
1546                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1547                         /*
1548                          * If architecture does not specify that _CCA is
1549                          * required for DMA-able devices (e.g. x86),
1550                          * we default to _CCA=1.
1551                          */
1552                         cca = 1;
1553                 else
1554                         acpi_handle_debug(adev->handle,
1555                                           "ACPI device is missing _CCA.\n");
1556         }
1557
1558         adev->flags.coherent_dma = cca;
1559 }
1560
1561 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1562 {
1563         bool *is_serial_bus_slave_p = data;
1564
1565         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1566                 return 1;
1567
1568         *is_serial_bus_slave_p = true;
1569
1570          /* no need to do more checking */
1571         return -1;
1572 }
1573
1574 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1575 {
1576         struct acpi_device *parent = device->parent;
1577         static const struct acpi_device_id indirect_io_hosts[] = {
1578                 {"HISI0191", 0},
1579                 {}
1580         };
1581
1582         return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1583 }
1584
1585 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1586 {
1587         struct list_head resource_list;
1588         bool is_serial_bus_slave = false;
1589         /*
1590          * These devices have multiple I2cSerialBus resources and an i2c-client
1591          * must be instantiated for each, each with its own i2c_device_id.
1592          * Normally we only instantiate an i2c-client for the first resource,
1593          * using the ACPI HID as id. These special cases are handled by the
1594          * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
1595          * which i2c_device_id to use for each resource.
1596          */
1597         static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
1598                 {"BSG1160", },
1599                 {"BSG2150", },
1600                 {"INT33FE", },
1601                 {"INT3515", },
1602                 {}
1603         };
1604
1605         if (acpi_is_indirect_io_slave(device))
1606                 return true;
1607
1608         /* Macs use device properties in lieu of _CRS resources */
1609         if (x86_apple_machine &&
1610             (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1611              fwnode_property_present(&device->fwnode, "i2cAddress") ||
1612              fwnode_property_present(&device->fwnode, "baud")))
1613                 return true;
1614
1615         /* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */
1616         if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
1617                 return false;
1618
1619         INIT_LIST_HEAD(&resource_list);
1620         acpi_dev_get_resources(device, &resource_list,
1621                                acpi_check_serial_bus_slave,
1622                                &is_serial_bus_slave);
1623         acpi_dev_free_resource_list(&resource_list);
1624
1625         return is_serial_bus_slave;
1626 }
1627
1628 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1629                              int type, unsigned long long sta,
1630                              struct acpi_device_info *info)
1631 {
1632         INIT_LIST_HEAD(&device->pnp.ids);
1633         device->device_type = type;
1634         device->handle = handle;
1635         device->parent = acpi_bus_get_parent(handle);
1636         fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
1637         acpi_set_device_status(device, sta);
1638         acpi_device_get_busid(device);
1639         acpi_set_pnp_ids(handle, &device->pnp, type, info);
1640         acpi_init_properties(device);
1641         acpi_bus_get_flags(device);
1642         device->flags.match_driver = false;
1643         device->flags.initialized = true;
1644         device->flags.enumeration_by_parent =
1645                 acpi_device_enumeration_by_parent(device);
1646         acpi_device_clear_enumerated(device);
1647         device_initialize(&device->dev);
1648         dev_set_uevent_suppress(&device->dev, true);
1649         acpi_init_coherency(device);
1650 }
1651
1652 void acpi_device_add_finalize(struct acpi_device *device)
1653 {
1654         dev_set_uevent_suppress(&device->dev, false);
1655         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1656 }
1657
1658 static int acpi_add_single_object(struct acpi_device **child,
1659                                   acpi_handle handle, int type,
1660                                   unsigned long long sta)
1661 {
1662         struct acpi_device_info *info = NULL;
1663         struct acpi_device *device;
1664         int result;
1665
1666         if (handle != ACPI_ROOT_OBJECT && type == ACPI_BUS_TYPE_DEVICE)
1667                 acpi_get_object_info(handle, &info);
1668
1669         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1670         if (!device) {
1671                 kfree(info);
1672                 return -ENOMEM;
1673         }
1674
1675         acpi_init_device_object(device, handle, type, sta, info);
1676         kfree(info);
1677         /*
1678          * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so
1679          * that we can call acpi_bus_get_status() and use its quirk handling.
1680          * Note this must be done before the get power-/wakeup_dev-flags calls.
1681          */
1682         if (type == ACPI_BUS_TYPE_DEVICE)
1683                 if (acpi_bus_get_status(device) < 0)
1684                         acpi_set_device_status(device, 0);
1685
1686         acpi_bus_get_power_flags(device);
1687         acpi_bus_get_wakeup_device_flags(device);
1688
1689         result = acpi_device_add(device, acpi_device_release);
1690         if (result) {
1691                 acpi_device_release(&device->dev);
1692                 return result;
1693         }
1694
1695         acpi_power_add_remove_device(device, true);
1696         acpi_device_add_finalize(device);
1697
1698         acpi_handle_debug(handle, "Added as %s, parent %s\n",
1699                           dev_name(&device->dev), device->parent ?
1700                                 dev_name(&device->parent->dev) : "(null)");
1701
1702         *child = device;
1703         return 0;
1704 }
1705
1706 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1707                                             void *context)
1708 {
1709         struct resource *res = context;
1710
1711         if (acpi_dev_resource_memory(ares, res))
1712                 return AE_CTRL_TERMINATE;
1713
1714         return AE_OK;
1715 }
1716
1717 static bool acpi_device_should_be_hidden(acpi_handle handle)
1718 {
1719         acpi_status status;
1720         struct resource res;
1721
1722         /* Check if it should ignore the UART device */
1723         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1724                 return false;
1725
1726         /*
1727          * The UART device described in SPCR table is assumed to have only one
1728          * memory resource present. So we only look for the first one here.
1729          */
1730         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1731                                      acpi_get_resource_memory, &res);
1732         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1733                 return false;
1734
1735         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1736                          &res.start);
1737
1738         return true;
1739 }
1740
1741 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1742                                     unsigned long long *sta)
1743 {
1744         acpi_status status;
1745         acpi_object_type acpi_type;
1746
1747         status = acpi_get_type(handle, &acpi_type);
1748         if (ACPI_FAILURE(status))
1749                 return -ENODEV;
1750
1751         switch (acpi_type) {
1752         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1753         case ACPI_TYPE_DEVICE:
1754                 if (acpi_device_should_be_hidden(handle))
1755                         return -ENODEV;
1756
1757                 *type = ACPI_BUS_TYPE_DEVICE;
1758                 /*
1759                  * acpi_add_single_object updates this once we've an acpi_device
1760                  * so that acpi_bus_get_status' quirk handling can be used.
1761                  */
1762                 *sta = ACPI_STA_DEFAULT;
1763                 break;
1764         case ACPI_TYPE_PROCESSOR:
1765                 *type = ACPI_BUS_TYPE_PROCESSOR;
1766                 status = acpi_bus_get_status_handle(handle, sta);
1767                 if (ACPI_FAILURE(status))
1768                         return -ENODEV;
1769                 break;
1770         case ACPI_TYPE_THERMAL:
1771                 *type = ACPI_BUS_TYPE_THERMAL;
1772                 *sta = ACPI_STA_DEFAULT;
1773                 break;
1774         case ACPI_TYPE_POWER:
1775                 *type = ACPI_BUS_TYPE_POWER;
1776                 *sta = ACPI_STA_DEFAULT;
1777                 break;
1778         default:
1779                 return -ENODEV;
1780         }
1781
1782         return 0;
1783 }
1784
1785 bool acpi_device_is_present(const struct acpi_device *adev)
1786 {
1787         return adev->status.present || adev->status.functional;
1788 }
1789
1790 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1791                                        const char *idstr,
1792                                        const struct acpi_device_id **matchid)
1793 {
1794         const struct acpi_device_id *devid;
1795
1796         if (handler->match)
1797                 return handler->match(idstr, matchid);
1798
1799         for (devid = handler->ids; devid->id[0]; devid++)
1800                 if (!strcmp((char *)devid->id, idstr)) {
1801                         if (matchid)
1802                                 *matchid = devid;
1803
1804                         return true;
1805                 }
1806
1807         return false;
1808 }
1809
1810 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1811                                         const struct acpi_device_id **matchid)
1812 {
1813         struct acpi_scan_handler *handler;
1814
1815         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1816                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1817                         return handler;
1818
1819         return NULL;
1820 }
1821
1822 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1823 {
1824         if (!!hotplug->enabled == !!val)
1825                 return;
1826
1827         mutex_lock(&acpi_scan_lock);
1828
1829         hotplug->enabled = val;
1830
1831         mutex_unlock(&acpi_scan_lock);
1832 }
1833
1834 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1835 {
1836         struct acpi_hardware_id *hwid;
1837
1838         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1839                 acpi_dock_add(adev);
1840                 return;
1841         }
1842         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1843                 struct acpi_scan_handler *handler;
1844
1845                 handler = acpi_scan_match_handler(hwid->id, NULL);
1846                 if (handler) {
1847                         adev->flags.hotplug_notify = true;
1848                         break;
1849                 }
1850         }
1851 }
1852
1853 static u32 acpi_scan_check_dep(acpi_handle handle)
1854 {
1855         struct acpi_handle_list dep_devices;
1856         acpi_status status;
1857         u32 count;
1858         int i;
1859
1860         /*
1861          * Check for _HID here to avoid deferring the enumeration of:
1862          * 1. PCI devices.
1863          * 2. ACPI nodes describing USB ports.
1864          * Still, checking for _HID catches more then just these cases ...
1865          */
1866         if (!acpi_has_method(handle, "_DEP") || !acpi_has_method(handle, "_HID"))
1867                 return 0;
1868
1869         status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices);
1870         if (ACPI_FAILURE(status)) {
1871                 acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
1872                 return 0;
1873         }
1874
1875         for (count = 0, i = 0; i < dep_devices.count; i++) {
1876                 struct acpi_device_info *info;
1877                 struct acpi_dep_data *dep;
1878                 bool skip;
1879
1880                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1881                 if (ACPI_FAILURE(status)) {
1882                         acpi_handle_debug(handle, "Error reading _DEP device info\n");
1883                         continue;
1884                 }
1885
1886                 skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
1887                 kfree(info);
1888
1889                 if (skip)
1890                         continue;
1891
1892                 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1893                 if (!dep)
1894                         continue;
1895
1896                 count++;
1897
1898                 dep->supplier = dep_devices.handles[i];
1899                 dep->consumer = handle;
1900
1901                 mutex_lock(&acpi_dep_list_lock);
1902                 list_add_tail(&dep->node , &acpi_dep_list);
1903                 mutex_unlock(&acpi_dep_list_lock);
1904         }
1905
1906         return count;
1907 }
1908
1909 static void acpi_scan_dep_init(struct acpi_device *adev)
1910 {
1911         struct acpi_dep_data *dep;
1912
1913         mutex_lock(&acpi_dep_list_lock);
1914
1915         list_for_each_entry(dep, &acpi_dep_list, node) {
1916                 if (dep->consumer == adev->handle)
1917                         adev->dep_unmet++;
1918         }
1919
1920         mutex_unlock(&acpi_dep_list_lock);
1921 }
1922
1923 static bool acpi_bus_scan_second_pass;
1924
1925 static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep,
1926                                       struct acpi_device **adev_p)
1927 {
1928         struct acpi_device *device = NULL;
1929         unsigned long long sta;
1930         int type;
1931         int result;
1932
1933         acpi_bus_get_device(handle, &device);
1934         if (device)
1935                 goto out;
1936
1937         result = acpi_bus_type_and_status(handle, &type, &sta);
1938         if (result)
1939                 return AE_OK;
1940
1941         if (type == ACPI_BUS_TYPE_POWER) {
1942                 acpi_add_power_resource(handle);
1943                 return AE_OK;
1944         }
1945
1946         if (type == ACPI_BUS_TYPE_DEVICE && check_dep) {
1947                 u32 count = acpi_scan_check_dep(handle);
1948                 /* Bail out if the number of recorded dependencies is not 0. */
1949                 if (count > 0) {
1950                         acpi_bus_scan_second_pass = true;
1951                         return AE_CTRL_DEPTH;
1952                 }
1953         }
1954
1955         acpi_add_single_object(&device, handle, type, sta);
1956         if (!device)
1957                 return AE_CTRL_DEPTH;
1958
1959         acpi_scan_init_hotplug(device);
1960         if (!check_dep)
1961                 acpi_scan_dep_init(device);
1962
1963 out:
1964         if (!*adev_p)
1965                 *adev_p = device;
1966
1967         return AE_OK;
1968 }
1969
1970 static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
1971                                         void *not_used, void **ret_p)
1972 {
1973         return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
1974 }
1975
1976 static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
1977                                         void *not_used, void **ret_p)
1978 {
1979         return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
1980 }
1981
1982 static void acpi_default_enumeration(struct acpi_device *device)
1983 {
1984         /*
1985          * Do not enumerate devices with enumeration_by_parent flag set as
1986          * they will be enumerated by their respective parents.
1987          */
1988         if (!device->flags.enumeration_by_parent) {
1989                 acpi_create_platform_device(device, NULL);
1990                 acpi_device_set_enumerated(device);
1991         } else {
1992                 blocking_notifier_call_chain(&acpi_reconfig_chain,
1993                                              ACPI_RECONFIG_DEVICE_ADD, device);
1994         }
1995 }
1996
1997 static const struct acpi_device_id generic_device_ids[] = {
1998         {ACPI_DT_NAMESPACE_HID, },
1999         {"", },
2000 };
2001
2002 static int acpi_generic_device_attach(struct acpi_device *adev,
2003                                       const struct acpi_device_id *not_used)
2004 {
2005         /*
2006          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
2007          * below can be unconditional.
2008          */
2009         if (adev->data.of_compatible)
2010                 acpi_default_enumeration(adev);
2011
2012         return 1;
2013 }
2014
2015 static struct acpi_scan_handler generic_device_handler = {
2016         .ids = generic_device_ids,
2017         .attach = acpi_generic_device_attach,
2018 };
2019
2020 static int acpi_scan_attach_handler(struct acpi_device *device)
2021 {
2022         struct acpi_hardware_id *hwid;
2023         int ret = 0;
2024
2025         list_for_each_entry(hwid, &device->pnp.ids, list) {
2026                 const struct acpi_device_id *devid;
2027                 struct acpi_scan_handler *handler;
2028
2029                 handler = acpi_scan_match_handler(hwid->id, &devid);
2030                 if (handler) {
2031                         if (!handler->attach) {
2032                                 device->pnp.type.platform_id = 0;
2033                                 continue;
2034                         }
2035                         device->handler = handler;
2036                         ret = handler->attach(device, devid);
2037                         if (ret > 0)
2038                                 break;
2039
2040                         device->handler = NULL;
2041                         if (ret < 0)
2042                                 break;
2043                 }
2044         }
2045
2046         return ret;
2047 }
2048
2049 static void acpi_bus_attach(struct acpi_device *device, bool first_pass)
2050 {
2051         struct acpi_device *child;
2052         bool skip = !first_pass && device->flags.visited;
2053         acpi_handle ejd;
2054         int ret;
2055
2056         if (skip)
2057                 goto ok;
2058
2059         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2060                 register_dock_dependent_device(device, ejd);
2061
2062         acpi_bus_get_status(device);
2063         /* Skip devices that are not present. */
2064         if (!acpi_device_is_present(device)) {
2065                 device->flags.initialized = false;
2066                 acpi_device_clear_enumerated(device);
2067                 device->flags.power_manageable = 0;
2068                 return;
2069         }
2070         if (device->handler)
2071                 goto ok;
2072
2073         if (!device->flags.initialized) {
2074                 device->flags.power_manageable =
2075                         device->power.states[ACPI_STATE_D0].flags.valid;
2076                 if (acpi_bus_init_power(device))
2077                         device->flags.power_manageable = 0;
2078
2079                 device->flags.initialized = true;
2080         } else if (device->flags.visited) {
2081                 goto ok;
2082         }
2083
2084         ret = acpi_scan_attach_handler(device);
2085         if (ret < 0)
2086                 return;
2087
2088         device->flags.match_driver = true;
2089         if (ret > 0 && !device->flags.enumeration_by_parent) {
2090                 acpi_device_set_enumerated(device);
2091                 goto ok;
2092         }
2093
2094         ret = device_attach(&device->dev);
2095         if (ret < 0)
2096                 return;
2097
2098         if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2099                 acpi_default_enumeration(device);
2100         else
2101                 acpi_device_set_enumerated(device);
2102
2103  ok:
2104         list_for_each_entry(child, &device->children, node)
2105                 acpi_bus_attach(child, first_pass);
2106
2107         if (!skip && device->handler && device->handler->hotplug.notify_online)
2108                 device->handler->hotplug.notify_online(device);
2109 }
2110
2111 void acpi_walk_dep_device_list(acpi_handle handle)
2112 {
2113         struct acpi_dep_data *dep, *tmp;
2114         struct acpi_device *adev;
2115
2116         mutex_lock(&acpi_dep_list_lock);
2117         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2118                 if (dep->supplier == handle) {
2119                         acpi_bus_get_device(dep->consumer, &adev);
2120
2121                         if (adev) {
2122                                 adev->dep_unmet--;
2123                                 if (!adev->dep_unmet)
2124                                         acpi_bus_attach(adev, true);
2125                         }
2126
2127                         list_del(&dep->node);
2128                         kfree(dep);
2129                 }
2130         }
2131         mutex_unlock(&acpi_dep_list_lock);
2132 }
2133 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2134
2135 /**
2136  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2137  * @handle: Root of the namespace scope to scan.
2138  *
2139  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2140  * found devices.
2141  *
2142  * If no devices were found, -ENODEV is returned, but it does not mean that
2143  * there has been a real error.  There just have been no suitable ACPI objects
2144  * in the table trunk from which the kernel could create a device and add an
2145  * appropriate driver.
2146  *
2147  * Must be called under acpi_scan_lock.
2148  */
2149 int acpi_bus_scan(acpi_handle handle)
2150 {
2151         struct acpi_device *device = NULL;
2152
2153         acpi_bus_scan_second_pass = false;
2154
2155         /* Pass 1: Avoid enumerating devices with missing dependencies. */
2156
2157         if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
2158                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2159                                     acpi_bus_check_add_1, NULL, NULL,
2160                                     (void **)&device);
2161
2162         if (!device)
2163                 return -ENODEV;
2164
2165         acpi_bus_attach(device, true);
2166
2167         if (!acpi_bus_scan_second_pass)
2168                 return 0;
2169
2170         /* Pass 2: Enumerate all of the remaining devices. */
2171
2172         device = NULL;
2173
2174         if (ACPI_SUCCESS(acpi_bus_check_add(handle, false, &device)))
2175                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2176                                     acpi_bus_check_add_2, NULL, NULL,
2177                                     (void **)&device);
2178
2179         acpi_bus_attach(device, false);
2180
2181         return 0;
2182 }
2183 EXPORT_SYMBOL(acpi_bus_scan);
2184
2185 /**
2186  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2187  * @adev: Root of the ACPI namespace scope to walk.
2188  *
2189  * Must be called under acpi_scan_lock.
2190  */
2191 void acpi_bus_trim(struct acpi_device *adev)
2192 {
2193         struct acpi_scan_handler *handler = adev->handler;
2194         struct acpi_device *child;
2195
2196         list_for_each_entry_reverse(child, &adev->children, node)
2197                 acpi_bus_trim(child);
2198
2199         adev->flags.match_driver = false;
2200         if (handler) {
2201                 if (handler->detach)
2202                         handler->detach(adev);
2203
2204                 adev->handler = NULL;
2205         } else {
2206                 device_release_driver(&adev->dev);
2207         }
2208         /*
2209          * Most likely, the device is going away, so put it into D3cold before
2210          * that.
2211          */
2212         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2213         adev->flags.initialized = false;
2214         acpi_device_clear_enumerated(adev);
2215 }
2216 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2217
2218 int acpi_bus_register_early_device(int type)
2219 {
2220         struct acpi_device *device = NULL;
2221         int result;
2222
2223         result = acpi_add_single_object(&device, NULL,
2224                                         type, ACPI_STA_DEFAULT);
2225         if (result)
2226                 return result;
2227
2228         device->flags.match_driver = true;
2229         return device_attach(&device->dev);
2230 }
2231 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2232
2233 static int acpi_bus_scan_fixed(void)
2234 {
2235         int result = 0;
2236
2237         /*
2238          * Enumerate all fixed-feature devices.
2239          */
2240         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2241                 struct acpi_device *device = NULL;
2242
2243                 result = acpi_add_single_object(&device, NULL,
2244                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2245                                                 ACPI_STA_DEFAULT);
2246                 if (result)
2247                         return result;
2248
2249                 device->flags.match_driver = true;
2250                 result = device_attach(&device->dev);
2251                 if (result < 0)
2252                         return result;
2253
2254                 device_init_wakeup(&device->dev, true);
2255         }
2256
2257         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2258                 struct acpi_device *device = NULL;
2259
2260                 result = acpi_add_single_object(&device, NULL,
2261                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2262                                                 ACPI_STA_DEFAULT);
2263                 if (result)
2264                         return result;
2265
2266                 device->flags.match_driver = true;
2267                 result = device_attach(&device->dev);
2268         }
2269
2270         return result < 0 ? result : 0;
2271 }
2272
2273 static void __init acpi_get_spcr_uart_addr(void)
2274 {
2275         acpi_status status;
2276         struct acpi_table_spcr *spcr_ptr;
2277
2278         status = acpi_get_table(ACPI_SIG_SPCR, 0,
2279                                 (struct acpi_table_header **)&spcr_ptr);
2280         if (ACPI_FAILURE(status)) {
2281                 pr_warn(PREFIX "STAO table present, but SPCR is missing\n");
2282                 return;
2283         }
2284
2285         spcr_uart_addr = spcr_ptr->serial_port.address;
2286         acpi_put_table((struct acpi_table_header *)spcr_ptr);
2287 }
2288
2289 static bool acpi_scan_initialized;
2290
2291 int __init acpi_scan_init(void)
2292 {
2293         int result;
2294         acpi_status status;
2295         struct acpi_table_stao *stao_ptr;
2296
2297         acpi_pci_root_init();
2298         acpi_pci_link_init();
2299         acpi_processor_init();
2300         acpi_platform_init();
2301         acpi_lpss_init();
2302         acpi_apd_init();
2303         acpi_cmos_rtc_init();
2304         acpi_container_init();
2305         acpi_memory_hotplug_init();
2306         acpi_watchdog_init();
2307         acpi_pnp_init();
2308         acpi_int340x_thermal_init();
2309         acpi_amba_init();
2310         acpi_init_lpit();
2311
2312         acpi_scan_add_handler(&generic_device_handler);
2313
2314         /*
2315          * If there is STAO table, check whether it needs to ignore the UART
2316          * device in SPCR table.
2317          */
2318         status = acpi_get_table(ACPI_SIG_STAO, 0,
2319                                 (struct acpi_table_header **)&stao_ptr);
2320         if (ACPI_SUCCESS(status)) {
2321                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2322                         pr_info(PREFIX "STAO Name List not yet supported.\n");
2323
2324                 if (stao_ptr->ignore_uart)
2325                         acpi_get_spcr_uart_addr();
2326
2327                 acpi_put_table((struct acpi_table_header *)stao_ptr);
2328         }
2329
2330         acpi_gpe_apply_masked_gpes();
2331         acpi_update_all_gpes();
2332
2333         /*
2334          * Although we call __add_memory() that is documented to require the
2335          * device_hotplug_lock, it is not necessary here because this is an
2336          * early code when userspace or any other code path cannot trigger
2337          * hotplug/hotunplug operations.
2338          */
2339         mutex_lock(&acpi_scan_lock);
2340         /*
2341          * Enumerate devices in the ACPI namespace.
2342          */
2343         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2344         if (result)
2345                 goto out;
2346
2347         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2348         if (result)
2349                 goto out;
2350
2351         /* Fixed feature devices do not exist on HW-reduced platform */
2352         if (!acpi_gbl_reduced_hardware) {
2353                 result = acpi_bus_scan_fixed();
2354                 if (result) {
2355                         acpi_detach_data(acpi_root->handle,
2356                                          acpi_scan_drop_device);
2357                         acpi_device_del(acpi_root);
2358                         put_device(&acpi_root->dev);
2359                         goto out;
2360                 }
2361         }
2362
2363         acpi_scan_initialized = true;
2364
2365  out:
2366         mutex_unlock(&acpi_scan_lock);
2367         return result;
2368 }
2369
2370 static struct acpi_probe_entry *ape;
2371 static int acpi_probe_count;
2372 static DEFINE_MUTEX(acpi_probe_mutex);
2373
2374 static int __init acpi_match_madt(union acpi_subtable_headers *header,
2375                                   const unsigned long end)
2376 {
2377         if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2378                 if (!ape->probe_subtbl(header, end))
2379                         acpi_probe_count++;
2380
2381         return 0;
2382 }
2383
2384 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2385 {
2386         int count = 0;
2387
2388         if (acpi_disabled)
2389                 return 0;
2390
2391         mutex_lock(&acpi_probe_mutex);
2392         for (ape = ap_head; nr; ape++, nr--) {
2393                 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2394                         acpi_probe_count = 0;
2395                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2396                         count += acpi_probe_count;
2397                 } else {
2398                         int res;
2399                         res = acpi_table_parse(ape->id, ape->probe_table);
2400                         if (!res)
2401                                 count++;
2402                 }
2403         }
2404         mutex_unlock(&acpi_probe_mutex);
2405
2406         return count;
2407 }
2408
2409 struct acpi_table_events_work {
2410         struct work_struct work;
2411         void *table;
2412         u32 event;
2413 };
2414
2415 static void acpi_table_events_fn(struct work_struct *work)
2416 {
2417         struct acpi_table_events_work *tew;
2418
2419         tew = container_of(work, struct acpi_table_events_work, work);
2420
2421         if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2422                 acpi_scan_lock_acquire();
2423                 acpi_bus_scan(ACPI_ROOT_OBJECT);
2424                 acpi_scan_lock_release();
2425         }
2426
2427         kfree(tew);
2428 }
2429
2430 void acpi_scan_table_handler(u32 event, void *table, void *context)
2431 {
2432         struct acpi_table_events_work *tew;
2433
2434         if (!acpi_scan_initialized)
2435                 return;
2436
2437         if (event != ACPI_TABLE_EVENT_LOAD)
2438                 return;
2439
2440         tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2441         if (!tew)
2442                 return;
2443
2444         INIT_WORK(&tew->work, acpi_table_events_fn);
2445         tew->table = table;
2446         tew->event = event;
2447
2448         schedule_work(&tew->work);
2449 }
2450
2451 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2452 {
2453         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2454 }
2455 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2456
2457 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2458 {
2459         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2460 }
2461 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);