drivers/acpi/scan.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * scan.c - support for transforming the ACPI namespace into individual objects
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/init.h>
   8 #include <linux/slab.h>
   9 #include <linux/kernel.h>
  10 #include <linux/acpi.h>
  11 #include <linux/acpi_iort.h>
  12 #include <linux/signal.h>
  13 #include <linux/kthread.h>
  14 #include <linux/dmi.h>
  15 #include <linux/nls.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/platform_data/x86/apple.h>
  18
  19 #include <asm/pgtable.h>
  20
  21 #include "internal.h"
  22
  23 #define _COMPONENT              ACPI_BUS_COMPONENT
  24 ACPI_MODULE_NAME("scan");
  25 extern struct acpi_device *acpi_root;
  26
  27 #define ACPI_BUS_CLASS                  "system_bus"
  28 #define ACPI_BUS_HID                    "LNXSYBUS"
  29 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  30
  31 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  32
  33 #define INVALID_ACPI_HANDLE     ((acpi_handle)empty_zero_page)
  34
  35 static const char *dummy_hid = "device";
  36
  37 static LIST_HEAD(acpi_dep_list);
  38 static DEFINE_MUTEX(acpi_dep_list_lock);
  39 LIST_HEAD(acpi_bus_id_list);
  40 static DEFINE_MUTEX(acpi_scan_lock);
  41 static LIST_HEAD(acpi_scan_handlers_list);
  42 DEFINE_MUTEX(acpi_device_lock);
  43 LIST_HEAD(acpi_wakeup_device_list);
  44 static DEFINE_MUTEX(acpi_hp_context_lock);
  45
  46 /*
  47  * The UART device described by the SPCR table is the only object which needs
  48  * special-casing. Everything else is covered by ACPI namespace paths in STAO
  49  * table.
  50  */
  51 static u64 spcr_uart_addr;
  52
  53 struct acpi_dep_data {
  54         struct list_head node;
  55         acpi_handle master;
  56         acpi_handle slave;
  57 };
  58
  59 void acpi_scan_lock_acquire(void)
  60 {
  61         mutex_lock(&acpi_scan_lock);
  62 }
  63 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  64
  65 void acpi_scan_lock_release(void)
  66 {
  67         mutex_unlock(&acpi_scan_lock);
  68 }
  69 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  70
  71 void acpi_lock_hp_context(void)
  72 {
  73         mutex_lock(&acpi_hp_context_lock);
  74 }
  75
  76 void acpi_unlock_hp_context(void)
  77 {
  78         mutex_unlock(&acpi_hp_context_lock);
  79 }
  80
  81 void acpi_initialize_hp_context(struct acpi_device *adev,
  82                                 struct acpi_hotplug_context *hp,
  83                                 int (*notify)(struct acpi_device *, u32),
  84                                 void (*uevent)(struct acpi_device *, u32))
  85 {
  86         acpi_lock_hp_context();
  87         hp->notify = notify;
  88         hp->uevent = uevent;
  89         acpi_set_hp_context(adev, hp);
  90         acpi_unlock_hp_context();
  91 }
  92 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
  93
  94 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  95 {
  96         if (!handler)
  97                 return -EINVAL;
  98
  99         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
 100         return 0;
 101 }
 102
 103 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
 104                                        const char *hotplug_profile_name)
 105 {
 106         int error;
 107
 108         error = acpi_scan_add_handler(handler);
 109         if (error)
 110                 return error;
 111
 112         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
 113         return 0;
 114 }
 115
 116 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 117 {
 118         struct acpi_device_physical_node *pn;
 119         bool offline = true;
 120         char *envp[] = { "EVENT=offline", NULL };
 121
 122         /*
 123          * acpi_container_offline() calls this for all of the container's
 124          * children under the container's physical_node_lock lock.
 125          */
 126         mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
 127
 128         list_for_each_entry(pn, &adev->physical_node_list, node)
 129                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
 130                         if (uevent)
 131                                 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
 132
 133                         offline = false;
 134                         break;
 135                 }
 136
 137         mutex_unlock(&adev->physical_node_lock);
 138         return offline;
 139 }
 140
 141 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 142                                     void **ret_p)
 143 {
 144         struct acpi_device *device = NULL;
 145         struct acpi_device_physical_node *pn;
 146         bool second_pass = (bool)data;
 147         acpi_status status = AE_OK;
 148
 149         if (acpi_bus_get_device(handle, &device))
 150                 return AE_OK;
 151
 152         if (device->handler && !device->handler->hotplug.enabled) {
 153                 *ret_p = &device->dev;
 154                 return AE_SUPPORT;
 155         }
 156
 157         mutex_lock(&device->physical_node_lock);
 158
 159         list_for_each_entry(pn, &device->physical_node_list, node) {
 160                 int ret;
 161
 162                 if (second_pass) {
 163                         /* Skip devices offlined by the first pass. */
 164                         if (pn->put_online)
 165                                 continue;
 166                 } else {
 167                         pn->put_online = false;
 168                 }
 169                 ret = device_offline(pn->dev);
 170                 if (ret >= 0) {
 171                         pn->put_online = !ret;
 172                 } else {
 173                         *ret_p = pn->dev;
 174                         if (second_pass) {
 175                                 status = AE_ERROR;
 176                                 break;
 177                         }
 178                 }
 179         }
 180
 181         mutex_unlock(&device->physical_node_lock);
 182
 183         return status;
 184 }
 185
 186 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 187                                    void **ret_p)
 188 {
 189         struct acpi_device *device = NULL;
 190         struct acpi_device_physical_node *pn;
 191
 192         if (acpi_bus_get_device(handle, &device))
 193                 return AE_OK;
 194
 195         mutex_lock(&device->physical_node_lock);
 196
 197         list_for_each_entry(pn, &device->physical_node_list, node)
 198                 if (pn->put_online) {
 199                         device_online(pn->dev);
 200                         pn->put_online = false;
 201                 }
 202
 203         mutex_unlock(&device->physical_node_lock);
 204
 205         return AE_OK;
 206 }
 207
 208 static int acpi_scan_try_to_offline(struct acpi_device *device)
 209 {
 210         acpi_handle handle = device->handle;
 211         struct device *errdev = NULL;
 212         acpi_status status;
 213
 214         /*
 215          * Carry out two passes here and ignore errors in the first pass,
 216          * because if the devices in question are memory blocks and
 217          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 218          * that the other blocks depend on, but it is not known in advance which
 219          * block holds them.
 220          *
 221          * If the first pass is successful, the second one isn't needed, though.
 222          */
 223         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 224                                      NULL, acpi_bus_offline, (void *)false,
 225                                      (void **)&errdev);
 226         if (status == AE_SUPPORT) {
 227                 dev_warn(errdev, "Offline disabled.\n");
 228                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 229                                     acpi_bus_online, NULL, NULL, NULL);
 230                 return -EPERM;
 231         }
 232         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
 233         if (errdev) {
 234                 errdev = NULL;
 235                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 236                                     NULL, acpi_bus_offline, (void *)true,
 237                                     (void **)&errdev);
 238                 if (!errdev)
 239                         acpi_bus_offline(handle, 0, (void *)true,
 240                                          (void **)&errdev);
 241
 242                 if (errdev) {
 243                         dev_warn(errdev, "Offline failed.\n");
 244                         acpi_bus_online(handle, 0, NULL, NULL);
 245                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 246                                             ACPI_UINT32_MAX, acpi_bus_online,
 247                                             NULL, NULL, NULL);
 248                         return -EBUSY;
 249                 }
 250         }
 251         return 0;
 252 }
 253
 254 static int acpi_scan_hot_remove(struct acpi_device *device)
 255 {
 256         acpi_handle handle = device->handle;
 257         unsigned long long sta;
 258         acpi_status status;
 259
 260         if (device->handler && device->handler->hotplug.demand_offline) {
 261                 if (!acpi_scan_is_offline(device, true))
 262                         return -EBUSY;
 263         } else {
 264                 int error = acpi_scan_try_to_offline(device);
 265                 if (error)
 266                         return error;
 267         }
 268
 269         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 270                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 271
 272         acpi_bus_trim(device);
 273
 274         acpi_evaluate_lck(handle, 0);
 275         /*
 276          * TBD: _EJD support.
 277          */
 278         status = acpi_evaluate_ej0(handle);
 279         if (status == AE_NOT_FOUND)
 280                 return -ENODEV;
 281         else if (ACPI_FAILURE(status))
 282                 return -EIO;
 283
 284         /*
 285          * Verify if eject was indeed successful.  If not, log an error
 286          * message.  No need to call _OST since _EJ0 call was made OK.
 287          */
 288         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 289         if (ACPI_FAILURE(status)) {
 290                 acpi_handle_warn(handle,
 291                         "Status check after eject failed (0x%x)\n", status);
 292         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 293                 acpi_handle_warn(handle,
 294                         "Eject incomplete - status 0x%llx\n", sta);
 295         }
 296
 297         return 0;
 298 }
 299
 300 static int acpi_scan_device_not_present(struct acpi_device *adev)
 301 {
 302         if (!acpi_device_enumerated(adev)) {
 303                 dev_warn(&adev->dev, "Still not present\n");
 304                 return -EALREADY;
 305         }
 306         acpi_bus_trim(adev);
 307         return 0;
 308 }
 309
 310 static int acpi_scan_device_check(struct acpi_device *adev)
 311 {
 312         int error;
 313
 314         acpi_bus_get_status(adev);
 315         if (adev->status.present || adev->status.functional) {
 316                 /*
 317                  * This function is only called for device objects for which
 318                  * matching scan handlers exist.  The only situation in which
 319                  * the scan handler is not attached to this device object yet
 320                  * is when the device has just appeared (either it wasn't
 321                  * present at all before or it was removed and then added
 322                  * again).
 323                  */
 324                 if (adev->handler) {
 325                         dev_warn(&adev->dev, "Already enumerated\n");
 326                         return -EALREADY;
 327                 }
 328                 error = acpi_bus_scan(adev->handle);
 329                 if (error) {
 330                         dev_warn(&adev->dev, "Namespace scan failure\n");
 331                         return error;
 332                 }
 333                 if (!adev->handler) {
 334                         dev_warn(&adev->dev, "Enumeration failure\n");
 335                         error = -ENODEV;
 336                 }
 337         } else {
 338                 error = acpi_scan_device_not_present(adev);
 339         }
 340         return error;
 341 }
 342
 343 static int acpi_scan_bus_check(struct acpi_device *adev)
 344 {
 345         struct acpi_scan_handler *handler = adev->handler;
 346         struct acpi_device *child;
 347         int error;
 348
 349         acpi_bus_get_status(adev);
 350         if (!(adev->status.present || adev->status.functional)) {
 351                 acpi_scan_device_not_present(adev);
 352                 return 0;
 353         }
 354         if (handler && handler->hotplug.scan_dependent)
 355                 return handler->hotplug.scan_dependent(adev);
 356
 357         error = acpi_bus_scan(adev->handle);
 358         if (error) {
 359                 dev_warn(&adev->dev, "Namespace scan failure\n");
 360                 return error;
 361         }
 362         list_for_each_entry(child, &adev->children, node) {
 363                 error = acpi_scan_bus_check(child);
 364                 if (error)
 365                         return error;
 366         }
 367         return 0;
 368 }
 369
 370 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 371 {
 372         switch (type) {
 373         case ACPI_NOTIFY_BUS_CHECK:
 374                 return acpi_scan_bus_check(adev);
 375         case ACPI_NOTIFY_DEVICE_CHECK:
 376                 return acpi_scan_device_check(adev);
 377         case ACPI_NOTIFY_EJECT_REQUEST:
 378         case ACPI_OST_EC_OSPM_EJECT:
 379                 if (adev->handler && !adev->handler->hotplug.enabled) {
 380                         dev_info(&adev->dev, "Eject disabled\n");
 381                         return -EPERM;
 382                 }
 383                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 384                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 385                 return acpi_scan_hot_remove(adev);
 386         }
 387         return -EINVAL;
 388 }
 389
 390 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 391 {
 392         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 393         int error = -ENODEV;
 394
 395         lock_device_hotplug();
 396         mutex_lock(&acpi_scan_lock);
 397
 398         /*
 399          * The device object's ACPI handle cannot become invalid as long as we
 400          * are holding acpi_scan_lock, but it might have become invalid before
 401          * that lock was acquired.
 402          */
 403         if (adev->handle == INVALID_ACPI_HANDLE)
 404                 goto err_out;
 405
 406         if (adev->flags.is_dock_station) {
 407                 error = dock_notify(adev, src);
 408         } else if (adev->flags.hotplug_notify) {
 409                 error = acpi_generic_hotplug_event(adev, src);
 410         } else {
 411                 int (*notify)(struct acpi_device *, u32);
 412
 413                 acpi_lock_hp_context();
 414                 notify = adev->hp ? adev->hp->notify : NULL;
 415                 acpi_unlock_hp_context();
 416                 /*
 417                  * There may be additional notify handlers for device objects
 418                  * without the .event() callback, so ignore them here.
 419                  */
 420                 if (notify)
 421                         error = notify(adev, src);
 422                 else
 423                         goto out;
 424         }
 425         switch (error) {
 426         case 0:
 427                 ost_code = ACPI_OST_SC_SUCCESS;
 428                 break;
 429         case -EPERM:
 430                 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 431                 break;
 432         case -EBUSY:
 433                 ost_code = ACPI_OST_SC_DEVICE_BUSY;
 434                 break;
 435         default:
 436                 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 437                 break;
 438         }
 439
 440  err_out:
 441         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 442
 443  out:
 444         acpi_bus_put_acpi_device(adev);
 445         mutex_unlock(&acpi_scan_lock);
 446         unlock_device_hotplug();
 447 }
 448
 449 static void acpi_free_power_resources_lists(struct acpi_device *device)
 450 {
 451         int i;
 452
 453         if (device->wakeup.flags.valid)
 454                 acpi_power_resources_list_free(&device->wakeup.resources);
 455
 456         if (!device->power.flags.power_resources)
 457                 return;
 458
 459         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 460                 struct acpi_device_power_state *ps = &device->power.states[i];
 461                 acpi_power_resources_list_free(&ps->resources);
 462         }
 463 }
 464
 465 static void acpi_device_release(struct device *dev)
 466 {
 467         struct acpi_device *acpi_dev = to_acpi_device(dev);
 468
 469         acpi_free_properties(acpi_dev);
 470         acpi_free_pnp_ids(&acpi_dev->pnp);
 471         acpi_free_power_resources_lists(acpi_dev);
 472         kfree(acpi_dev);
 473 }
 474
 475 static void acpi_device_del(struct acpi_device *device)
 476 {
 477         struct acpi_device_bus_id *acpi_device_bus_id;
 478
 479         mutex_lock(&acpi_device_lock);
 480         if (device->parent)
 481                 list_del(&device->node);
 482
 483         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
 484                 if (!strcmp(acpi_device_bus_id->bus_id,
 485                             acpi_device_hid(device))) {
 486                         if (acpi_device_bus_id->instance_no > 0)
 487                                 acpi_device_bus_id->instance_no--;
 488                         else {
 489                                 list_del(&acpi_device_bus_id->node);
 490                                 kfree(acpi_device_bus_id);
 491                         }
 492                         break;
 493                 }
 494
 495         list_del(&device->wakeup_list);
 496         mutex_unlock(&acpi_device_lock);
 497
 498         acpi_power_add_remove_device(device, false);
 499         acpi_device_remove_files(device);
 500         if (device->remove)
 501                 device->remove(device);
 502
 503         device_del(&device->dev);
 504 }
 505
 506 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
 507
 508 static LIST_HEAD(acpi_device_del_list);
 509 static DEFINE_MUTEX(acpi_device_del_lock);
 510
 511 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 512 {
 513         for (;;) {
 514                 struct acpi_device *adev;
 515
 516                 mutex_lock(&acpi_device_del_lock);
 517
 518                 if (list_empty(&acpi_device_del_list)) {
 519                         mutex_unlock(&acpi_device_del_lock);
 520                         break;
 521                 }
 522                 adev = list_first_entry(&acpi_device_del_list,
 523                                         struct acpi_device, del_list);
 524                 list_del(&adev->del_list);
 525
 526                 mutex_unlock(&acpi_device_del_lock);
 527
 528                 blocking_notifier_call_chain(&acpi_reconfig_chain,
 529                                              ACPI_RECONFIG_DEVICE_REMOVE, adev);
 530
 531                 acpi_device_del(adev);
 532                 /*
 533                  * Drop references to all power resources that might have been
 534                  * used by the device.
 535                  */
 536                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
 537                 put_device(&adev->dev);
 538         }
 539 }
 540
 541 /**
 542  * acpi_scan_drop_device - Drop an ACPI device object.
 543  * @handle: Handle of an ACPI namespace node, not used.
 544  * @context: Address of the ACPI device object to drop.
 545  *
 546  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
 547  * namespace node the device object pointed to by @context is attached to.
 548  *
 549  * The unregistration is carried out asynchronously to avoid running
 550  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
 551  * ensure the correct ordering (the device objects must be unregistered in the
 552  * same order in which the corresponding namespace nodes are deleted).
 553  */
 554 static void acpi_scan_drop_device(acpi_handle handle, void *context)
 555 {
 556         static DECLARE_WORK(work, acpi_device_del_work_fn);
 557         struct acpi_device *adev = context;
 558
 559         mutex_lock(&acpi_device_del_lock);
 560
 561         /*
 562          * Use the ACPI hotplug workqueue which is ordered, so this work item
 563          * won't run after any hotplug work items submitted subsequently.  That
 564          * prevents attempts to register device objects identical to those being
 565          * deleted from happening concurrently (such attempts result from
 566          * hotplug events handled via the ACPI hotplug workqueue).  It also will
 567          * run after all of the work items submitted previosuly, which helps
 568          * those work items to ensure that they are not accessing stale device
 569          * objects.
 570          */
 571         if (list_empty(&acpi_device_del_list))
 572                 acpi_queue_hotplug_work(&work);
 573
 574         list_add_tail(&adev->del_list, &acpi_device_del_list);
 575         /* Make acpi_ns_validate_handle() return NULL for this handle. */
 576         adev->handle = INVALID_ACPI_HANDLE;
 577
 578         mutex_unlock(&acpi_device_del_lock);
 579 }
 580
 581 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
 582                                 void (*callback)(void *))
 583 {
 584         acpi_status status;
 585
 586         if (!device)
 587                 return -EINVAL;
 588
 589         status = acpi_get_data_full(handle, acpi_scan_drop_device,
 590                                     (void **)device, callback);
 591         if (ACPI_FAILURE(status) || !*device) {
 592                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 593                                   handle));
 594                 return -ENODEV;
 595         }
 596         return 0;
 597 }
 598
 599 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 600 {
 601         return acpi_get_device_data(handle, device, NULL);
 602 }
 603 EXPORT_SYMBOL(acpi_bus_get_device);
 604
 605 static void get_acpi_device(void *dev)
 606 {
 607         if (dev)
 608                 get_device(&((struct acpi_device *)dev)->dev);
 609 }
 610
 611 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 612 {
 613         struct acpi_device *adev = NULL;
 614
 615         acpi_get_device_data(handle, &adev, get_acpi_device);
 616         return adev;
 617 }
 618
 619 void acpi_bus_put_acpi_device(struct acpi_device *adev)
 620 {
 621         put_device(&adev->dev);
 622 }
 623
 624 int acpi_device_add(struct acpi_device *device,
 625                     void (*release)(struct device *))
 626 {
 627         int result;
 628         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 629         int found = 0;
 630
 631         if (device->handle) {
 632                 acpi_status status;
 633
 634                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
 635                                           device);
 636                 if (ACPI_FAILURE(status)) {
 637                         acpi_handle_err(device->handle,
 638                                         "Unable to attach device data\n");
 639                         return -ENODEV;
 640                 }
 641         }
 642
 643         /*
 644          * Linkage
 645          * -------
 646          * Link this device to its parent and siblings.
 647          */
 648         INIT_LIST_HEAD(&device->children);
 649         INIT_LIST_HEAD(&device->node);
 650         INIT_LIST_HEAD(&device->wakeup_list);
 651         INIT_LIST_HEAD(&device->physical_node_list);
 652         INIT_LIST_HEAD(&device->del_list);
 653         mutex_init(&device->physical_node_lock);
 654
 655         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 656         if (!new_bus_id) {
 657                 pr_err(PREFIX "Memory allocation error\n");
 658                 result = -ENOMEM;
 659                 goto err_detach;
 660         }
 661
 662         mutex_lock(&acpi_device_lock);
 663         /*
 664          * Find suitable bus_id and instance number in acpi_bus_id_list
 665          * If failed, create one and link it into acpi_bus_id_list
 666          */
 667         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 668                 if (!strcmp(acpi_device_bus_id->bus_id,
 669                             acpi_device_hid(device))) {
 670                         acpi_device_bus_id->instance_no++;
 671                         found = 1;
 672                         kfree(new_bus_id);
 673                         break;
 674                 }
 675         }
 676         if (!found) {
 677                 acpi_device_bus_id = new_bus_id;
 678                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 679                 acpi_device_bus_id->instance_no = 0;
 680                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 681         }
 682         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 683
 684         if (device->parent)
 685                 list_add_tail(&device->node, &device->parent->children);
 686
 687         if (device->wakeup.flags.valid)
 688                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 689         mutex_unlock(&acpi_device_lock);
 690
 691         if (device->parent)
 692                 device->dev.parent = &device->parent->dev;
 693         device->dev.bus = &acpi_bus_type;
 694         device->dev.release = release;
 695         result = device_add(&device->dev);
 696         if (result) {
 697                 dev_err(&device->dev, "Error registering device\n");
 698                 goto err;
 699         }
 700
 701         result = acpi_device_setup_files(device);
 702         if (result)
 703                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 704                        dev_name(&device->dev));
 705
 706         return 0;
 707
 708  err:
 709         mutex_lock(&acpi_device_lock);
 710         if (device->parent)
 711                 list_del(&device->node);
 712         list_del(&device->wakeup_list);
 713         mutex_unlock(&acpi_device_lock);
 714
 715  err_detach:
 716         acpi_detach_data(device->handle, acpi_scan_drop_device);
 717         return result;
 718 }
 719
 720 /* --------------------------------------------------------------------------
 721                                  Device Enumeration
 722    -------------------------------------------------------------------------- */
 723 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 724 {
 725         struct acpi_device *device = NULL;
 726         acpi_status status;
 727
 728         /*
 729          * Fixed hardware devices do not appear in the namespace and do not
 730          * have handles, but we fabricate acpi_devices for them, so we have
 731          * to deal with them specially.
 732          */
 733         if (!handle)
 734                 return acpi_root;
 735
 736         do {
 737                 status = acpi_get_parent(handle, &handle);
 738                 if (ACPI_FAILURE(status))
 739                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 740         } while (acpi_bus_get_device(handle, &device));
 741         return device;
 742 }
 743
 744 acpi_status
 745 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 746 {
 747         acpi_status status;
 748         acpi_handle tmp;
 749         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 750         union acpi_object *obj;
 751
 752         status = acpi_get_handle(handle, "_EJD", &tmp);
 753         if (ACPI_FAILURE(status))
 754                 return status;
 755
 756         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 757         if (ACPI_SUCCESS(status)) {
 758                 obj = buffer.pointer;
 759                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 760                                          ejd);
 761                 kfree(buffer.pointer);
 762         }
 763         return status;
 764 }
 765 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 766
 767 static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
 768 {
 769         acpi_handle handle = dev->handle;
 770         struct acpi_device_wakeup *wakeup = &dev->wakeup;
 771         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 772         union acpi_object *package = NULL;
 773         union acpi_object *element = NULL;
 774         acpi_status status;
 775         int err = -ENODATA;
 776
 777         INIT_LIST_HEAD(&wakeup->resources);
 778
 779         /* _PRW */
 780         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 781         if (ACPI_FAILURE(status)) {
 782                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 783                 return err;
 784         }
 785
 786         package = (union acpi_object *)buffer.pointer;
 787
 788         if (!package || package->package.count < 2)
 789                 goto out;
 790
 791         element = &(package->package.elements[0]);
 792         if (!element)
 793                 goto out;
 794
 795         if (element->type == ACPI_TYPE_PACKAGE) {
 796                 if ((element->package.count < 2) ||
 797                     (element->package.elements[0].type !=
 798                      ACPI_TYPE_LOCAL_REFERENCE)
 799                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 800                         goto out;
 801
 802                 wakeup->gpe_device =
 803                     element->package.elements[0].reference.handle;
 804                 wakeup->gpe_number =
 805                     (u32) element->package.elements[1].integer.value;
 806         } else if (element->type == ACPI_TYPE_INTEGER) {
 807                 wakeup->gpe_device = NULL;
 808                 wakeup->gpe_number = element->integer.value;
 809         } else {
 810                 goto out;
 811         }
 812
 813         element = &(package->package.elements[1]);
 814         if (element->type != ACPI_TYPE_INTEGER)
 815                 goto out;
 816
 817         wakeup->sleep_state = element->integer.value;
 818
 819         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 820         if (err)
 821                 goto out;
 822
 823         if (!list_empty(&wakeup->resources)) {
 824                 int sleep_state;
 825
 826                 err = acpi_power_wakeup_list_init(&wakeup->resources,
 827                                                   &sleep_state);
 828                 if (err) {
 829                         acpi_handle_warn(handle, "Retrieving current states "
 830                                          "of wakeup power resources failed\n");
 831                         acpi_power_resources_list_free(&wakeup->resources);
 832                         goto out;
 833                 }
 834                 if (sleep_state < wakeup->sleep_state) {
 835                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
 836                                          "(S%d) by S%d from power resources\n",
 837                                          (int)wakeup->sleep_state, sleep_state);
 838                         wakeup->sleep_state = sleep_state;
 839                 }
 840         }
 841
 842  out:
 843         kfree(buffer.pointer);
 844         return err;
 845 }
 846
 847 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
 848 {
 849         static const struct acpi_device_id button_device_ids[] = {
 850                 {"PNP0C0C", 0},         /* Power button */
 851                 {"PNP0C0D", 0},         /* Lid */
 852                 {"PNP0C0E", 0},         /* Sleep button */
 853                 {"", 0},
 854         };
 855         struct acpi_device_wakeup *wakeup = &device->wakeup;
 856         acpi_status status;
 857
 858         wakeup->flags.notifier_present = 0;
 859
 860         /* Power button, Lid switch always enable wakeup */
 861         if (!acpi_match_device_ids(device, button_device_ids)) {
 862                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 863                         /* Do not use Lid/sleep button for S5 wakeup */
 864                         if (wakeup->sleep_state == ACPI_STATE_S5)
 865                                 wakeup->sleep_state = ACPI_STATE_S4;
 866                 }
 867                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 868                 device_set_wakeup_capable(&device->dev, true);
 869                 return true;
 870         }
 871
 872         status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 873                                          wakeup->gpe_number);
 874         return ACPI_SUCCESS(status);
 875 }
 876
 877 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 878 {
 879         int err;
 880
 881         /* Presence of _PRW indicates wake capable */
 882         if (!acpi_has_method(device->handle, "_PRW"))
 883                 return;
 884
 885         err = acpi_bus_extract_wakeup_device_power_package(device);
 886         if (err) {
 887                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
 888                 return;
 889         }
 890
 891         device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
 892         device->wakeup.prepare_count = 0;
 893         /*
 894          * Call _PSW/_DSW object to disable its ability to wake the sleeping
 895          * system for the ACPI device with the _PRW object.
 896          * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
 897          * So it is necessary to call _DSW object first. Only when it is not
 898          * present will the _PSW object used.
 899          */
 900         err = acpi_device_sleep_wake(device, 0, 0, 0);
 901         if (err)
 902                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 903                                 "error in _DSW or _PSW evaluation\n"));
 904 }
 905
 906 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 907 {
 908         struct acpi_device_power_state *ps = &device->power.states[state];
 909         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 910         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 911         acpi_status status;
 912
 913         INIT_LIST_HEAD(&ps->resources);
 914
 915         /* Evaluate "_PRx" to get referenced power resources */
 916         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 917         if (ACPI_SUCCESS(status)) {
 918                 union acpi_object *package = buffer.pointer;
 919
 920                 if (buffer.length && package
 921                     && package->type == ACPI_TYPE_PACKAGE
 922                     && package->package.count) {
 923                         int err = acpi_extract_power_resources(package, 0,
 924                                                                &ps->resources);
 925                         if (!err)
 926                                 device->power.flags.power_resources = 1;
 927                 }
 928                 ACPI_FREE(buffer.pointer);
 929         }
 930
 931         /* Evaluate "_PSx" to see if we can do explicit sets */
 932         pathname[2] = 'S';
 933         if (acpi_has_method(device->handle, pathname))
 934                 ps->flags.explicit_set = 1;
 935
 936         /* State is valid if there are means to put the device into it. */
 937         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
 938                 ps->flags.valid = 1;
 939
 940         ps->power = -1;         /* Unknown - driver assigned */
 941         ps->latency = -1;       /* Unknown - driver assigned */
 942 }
 943
 944 static void acpi_bus_get_power_flags(struct acpi_device *device)
 945 {
 946         u32 i;
 947
 948         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 949         if (!acpi_has_method(device->handle, "_PS0") &&
 950             !acpi_has_method(device->handle, "_PR0"))
 951                 return;
 952
 953         device->flags.power_manageable = 1;
 954
 955         /*
 956          * Power Management Flags
 957          */
 958         if (acpi_has_method(device->handle, "_PSC"))
 959                 device->power.flags.explicit_get = 1;
 960
 961         if (acpi_has_method(device->handle, "_IRC"))
 962                 device->power.flags.inrush_current = 1;
 963
 964         if (acpi_has_method(device->handle, "_DSW"))
 965                 device->power.flags.dsw_present = 1;
 966
 967         /*
 968          * Enumerate supported power management states
 969          */
 970         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
 971                 acpi_bus_init_power_state(device, i);
 972
 973         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
 974         if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
 975                 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
 976
 977         /* Set defaults for D0 and D3hot states (always valid) */
 978         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 979         device->power.states[ACPI_STATE_D0].power = 100;
 980         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
 981
 982         if (acpi_bus_init_power(device))
 983                 device->flags.power_manageable = 0;
 984 }
 985
 986 static void acpi_bus_get_flags(struct acpi_device *device)
 987 {
 988         /* Presence of _STA indicates 'dynamic_status' */
 989         if (acpi_has_method(device->handle, "_STA"))
 990                 device->flags.dynamic_status = 1;
 991
 992         /* Presence of _RMV indicates 'removable' */
 993         if (acpi_has_method(device->handle, "_RMV"))
 994                 device->flags.removable = 1;
 995
 996         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 997         if (acpi_has_method(device->handle, "_EJD") ||
 998             acpi_has_method(device->handle, "_EJ0"))
 999                 device->flags.ejectable = 1;
1000 }
1001
1002 static void acpi_device_get_busid(struct acpi_device *device)
1003 {
1004         char bus_id[5] = { '?', 0 };
1005         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1006         int i = 0;
1007
1008         /*
1009          * Bus ID
1010          * ------
1011          * The device's Bus ID is simply the object name.
1012          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1013          */
1014         if (ACPI_IS_ROOT_DEVICE(device)) {
1015                 strcpy(device->pnp.bus_id, "ACPI");
1016                 return;
1017         }
1018
1019         switch (device->device_type) {
1020         case ACPI_BUS_TYPE_POWER_BUTTON:
1021                 strcpy(device->pnp.bus_id, "PWRF");
1022                 break;
1023         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1024                 strcpy(device->pnp.bus_id, "SLPF");
1025                 break;
1026         case ACPI_BUS_TYPE_ECDT_EC:
1027                 strcpy(device->pnp.bus_id, "ECDT");
1028                 break;
1029         default:
1030                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1031                 /* Clean up trailing underscores (if any) */
1032                 for (i = 3; i > 1; i--) {
1033                         if (bus_id[i] == '_')
1034                                 bus_id[i] = '\0';
1035                         else
1036                                 break;
1037                 }
1038                 strcpy(device->pnp.bus_id, bus_id);
1039                 break;
1040         }
1041 }
1042
1043 /*
1044  * acpi_ata_match - see if an acpi object is an ATA device
1045  *
1046  * If an acpi object has one of the ACPI ATA methods defined,
1047  * then we can safely call it an ATA device.
1048  */
1049 bool acpi_ata_match(acpi_handle handle)
1050 {
1051         return acpi_has_method(handle, "_GTF") ||
1052                acpi_has_method(handle, "_GTM") ||
1053                acpi_has_method(handle, "_STM") ||
1054                acpi_has_method(handle, "_SDD");
1055 }
1056
1057 /*
1058  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1059  *
1060  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1061  * then we can safely call it an ejectable drive bay
1062  */
1063 bool acpi_bay_match(acpi_handle handle)
1064 {
1065         acpi_handle phandle;
1066
1067         if (!acpi_has_method(handle, "_EJ0"))
1068                 return false;
1069         if (acpi_ata_match(handle))
1070                 return true;
1071         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1072                 return false;
1073
1074         return acpi_ata_match(phandle);
1075 }
1076
1077 bool acpi_device_is_battery(struct acpi_device *adev)
1078 {
1079         struct acpi_hardware_id *hwid;
1080
1081         list_for_each_entry(hwid, &adev->pnp.ids, list)
1082                 if (!strcmp("PNP0C0A", hwid->id))
1083                         return true;
1084
1085         return false;
1086 }
1087
1088 static bool is_ejectable_bay(struct acpi_device *adev)
1089 {
1090         acpi_handle handle = adev->handle;
1091
1092         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1093                 return true;
1094
1095         return acpi_bay_match(handle);
1096 }
1097
1098 /*
1099  * acpi_dock_match - see if an acpi object has a _DCK method
1100  */
1101 bool acpi_dock_match(acpi_handle handle)
1102 {
1103         return acpi_has_method(handle, "_DCK");
1104 }
1105
1106 static acpi_status
1107 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1108                           void **return_value)
1109 {
1110         long *cap = context;
1111
1112         if (acpi_has_method(handle, "_BCM") &&
1113             acpi_has_method(handle, "_BCL")) {
1114                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1115                                   "support\n"));
1116                 *cap |= ACPI_VIDEO_BACKLIGHT;
1117                 /* We have backlight support, no need to scan further */
1118                 return AE_CTRL_TERMINATE;
1119         }
1120         return 0;
1121 }
1122
1123 /* Returns true if the ACPI object is a video device which can be
1124  * handled by video.ko.
1125  * The device will get a Linux specific CID added in scan.c to
1126  * identify the device as an ACPI graphics device
1127  * Be aware that the graphics device may not be physically present
1128  * Use acpi_video_get_capabilities() to detect general ACPI video
1129  * capabilities of present cards
1130  */
1131 long acpi_is_video_device(acpi_handle handle)
1132 {
1133         long video_caps = 0;
1134
1135         /* Is this device able to support video switching ? */
1136         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1137                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1138
1139         /* Is this device able to retrieve a video ROM ? */
1140         if (acpi_has_method(handle, "_ROM"))
1141                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1142
1143         /* Is this device able to configure which video head to be POSTed ? */
1144         if (acpi_has_method(handle, "_VPO") &&
1145             acpi_has_method(handle, "_GPD") &&
1146             acpi_has_method(handle, "_SPD"))
1147                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1148
1149         /* Only check for backlight functionality if one of the above hit. */
1150         if (video_caps)
1151                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1152                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1153                                     &video_caps, NULL);
1154
1155         return video_caps;
1156 }
1157 EXPORT_SYMBOL(acpi_is_video_device);
1158
1159 const char *acpi_device_hid(struct acpi_device *device)
1160 {
1161         struct acpi_hardware_id *hid;
1162
1163         if (list_empty(&device->pnp.ids))
1164                 return dummy_hid;
1165
1166         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1167         return hid->id;
1168 }
1169 EXPORT_SYMBOL(acpi_device_hid);
1170
1171 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1172 {
1173         struct acpi_hardware_id *id;
1174
1175         id = kmalloc(sizeof(*id), GFP_KERNEL);
1176         if (!id)
1177                 return;
1178
1179         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1180         if (!id->id) {
1181                 kfree(id);
1182                 return;
1183         }
1184
1185         list_add_tail(&id->list, &pnp->ids);
1186         pnp->type.hardware_id = 1;
1187 }
1188
1189 /*
1190  * Old IBM workstations have a DSDT bug wherein the SMBus object
1191  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1192  * prefix.  Work around this.
1193  */
1194 static bool acpi_ibm_smbus_match(acpi_handle handle)
1195 {
1196         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1197         struct acpi_buffer path = { sizeof(node_name), node_name };
1198
1199         if (!dmi_name_in_vendors("IBM"))
1200                 return false;
1201
1202         /* Look for SMBS object */
1203         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1204             strcmp("SMBS", path.pointer))
1205                 return false;
1206
1207         /* Does it have the necessary (but misnamed) methods? */
1208         if (acpi_has_method(handle, "SBI") &&
1209             acpi_has_method(handle, "SBR") &&
1210             acpi_has_method(handle, "SBW"))
1211                 return true;
1212
1213         return false;
1214 }
1215
1216 static bool acpi_object_is_system_bus(acpi_handle handle)
1217 {
1218         acpi_handle tmp;
1219
1220         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1221             tmp == handle)
1222                 return true;
1223         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1224             tmp == handle)
1225                 return true;
1226
1227         return false;
1228 }
1229
1230 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1231                                 int device_type)
1232 {
1233         acpi_status status;
1234         struct acpi_device_info *info;
1235         struct acpi_pnp_device_id_list *cid_list;
1236         int i;
1237
1238         switch (device_type) {
1239         case ACPI_BUS_TYPE_DEVICE:
1240                 if (handle == ACPI_ROOT_OBJECT) {
1241                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1242                         break;
1243                 }
1244
1245                 status = acpi_get_object_info(handle, &info);
1246                 if (ACPI_FAILURE(status)) {
1247                         pr_err(PREFIX "%s: Error reading device info\n",
1248                                         __func__);
1249                         return;
1250                 }
1251
1252                 if (info->valid & ACPI_VALID_HID) {
1253                         acpi_add_id(pnp, info->hardware_id.string);
1254                         pnp->type.platform_id = 1;
1255                 }
1256                 if (info->valid & ACPI_VALID_CID) {
1257                         cid_list = &info->compatible_id_list;
1258                         for (i = 0; i < cid_list->count; i++)
1259                                 acpi_add_id(pnp, cid_list->ids[i].string);
1260                 }
1261                 if (info->valid & ACPI_VALID_ADR) {
1262                         pnp->bus_address = info->address;
1263                         pnp->type.bus_address = 1;
1264                 }
1265                 if (info->valid & ACPI_VALID_UID)
1266                         pnp->unique_id = kstrdup(info->unique_id.string,
1267                                                         GFP_KERNEL);
1268                 if (info->valid & ACPI_VALID_CLS)
1269                         acpi_add_id(pnp, info->class_code.string);
1270
1271                 kfree(info);
1272
1273                 /*
1274                  * Some devices don't reliably have _HIDs & _CIDs, so add
1275                  * synthetic HIDs to make sure drivers can find them.
1276                  */
1277                 if (acpi_is_video_device(handle))
1278                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1279                 else if (acpi_bay_match(handle))
1280                         acpi_add_id(pnp, ACPI_BAY_HID);
1281                 else if (acpi_dock_match(handle))
1282                         acpi_add_id(pnp, ACPI_DOCK_HID);
1283                 else if (acpi_ibm_smbus_match(handle))
1284                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1285                 else if (list_empty(&pnp->ids) &&
1286                          acpi_object_is_system_bus(handle)) {
1287                         /* \_SB, \_TZ, LNXSYBUS */
1288                         acpi_add_id(pnp, ACPI_BUS_HID);
1289                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1290                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1291                 }
1292
1293                 break;
1294         case ACPI_BUS_TYPE_POWER:
1295                 acpi_add_id(pnp, ACPI_POWER_HID);
1296                 break;
1297         case ACPI_BUS_TYPE_PROCESSOR:
1298                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1299                 break;
1300         case ACPI_BUS_TYPE_THERMAL:
1301                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1302                 break;
1303         case ACPI_BUS_TYPE_POWER_BUTTON:
1304                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1305                 break;
1306         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1307                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1308                 break;
1309         case ACPI_BUS_TYPE_ECDT_EC:
1310                 acpi_add_id(pnp, ACPI_ECDT_HID);
1311                 break;
1312         }
1313 }
1314
1315 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1316 {
1317         struct acpi_hardware_id *id, *tmp;
1318
1319         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1320                 kfree_const(id->id);
1321                 kfree(id);
1322         }
1323         kfree(pnp->unique_id);
1324 }
1325
1326 /**
1327  * acpi_dma_supported - Check DMA support for the specified device.
1328  * @adev: The pointer to acpi device
1329  *
1330  * Return false if DMA is not supported. Otherwise, return true
1331  */
1332 bool acpi_dma_supported(struct acpi_device *adev)
1333 {
1334         if (!adev)
1335                 return false;
1336
1337         if (adev->flags.cca_seen)
1338                 return true;
1339
1340         /*
1341         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1342         * DMA on "Intel platforms".  Presumably that includes all x86 and
1343         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1344         */
1345         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1346                 return true;
1347
1348         return false;
1349 }
1350
1351 /**
1352  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1353  * @adev: The pointer to acpi device
1354  *
1355  * Return enum dev_dma_attr.
1356  */
1357 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1358 {
1359         if (!acpi_dma_supported(adev))
1360                 return DEV_DMA_NOT_SUPPORTED;
1361
1362         if (adev->flags.coherent_dma)
1363                 return DEV_DMA_COHERENT;
1364         else
1365                 return DEV_DMA_NON_COHERENT;
1366 }
1367
1368 /**
1369  * acpi_dma_get_range() - Get device DMA parameters.
1370  *
1371  * @dev: device to configure
1372  * @dma_addr: pointer device DMA address result
1373  * @offset: pointer to the DMA offset result
1374  * @size: pointer to DMA range size result
1375  *
1376  * Evaluate DMA regions and return respectively DMA region start, offset
1377  * and size in dma_addr, offset and size on parsing success; it does not
1378  * update the passed in values on failure.
1379  *
1380  * Return 0 on success, < 0 on failure.
1381  */
1382 int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1383                        u64 *size)
1384 {
1385         struct acpi_device *adev;
1386         LIST_HEAD(list);
1387         struct resource_entry *rentry;
1388         int ret;
1389         struct device *dma_dev = dev;
1390         u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1391
1392         /*
1393          * Walk the device tree chasing an ACPI companion with a _DMA
1394          * object while we go. Stop if we find a device with an ACPI
1395          * companion containing a _DMA method.
1396          */
1397         do {
1398                 adev = ACPI_COMPANION(dma_dev);
1399                 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1400                         break;
1401
1402                 dma_dev = dma_dev->parent;
1403         } while (dma_dev);
1404
1405         if (!dma_dev)
1406                 return -ENODEV;
1407
1408         if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1409                 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1410                 return -EINVAL;
1411         }
1412
1413         ret = acpi_dev_get_dma_resources(adev, &list);
1414         if (ret > 0) {
1415                 list_for_each_entry(rentry, &list, node) {
1416                         if (dma_offset && rentry->offset != dma_offset) {
1417                                 ret = -EINVAL;
1418                                 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1419                                 goto out;
1420                         }
1421                         dma_offset = rentry->offset;
1422
1423                         /* Take lower and upper limits */
1424                         if (rentry->res->start < dma_start)
1425                                 dma_start = rentry->res->start;
1426                         if (rentry->res->end > dma_end)
1427                                 dma_end = rentry->res->end;
1428                 }
1429
1430                 if (dma_start >= dma_end) {
1431                         ret = -EINVAL;
1432                         dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1433                         goto out;
1434                 }
1435
1436                 *dma_addr = dma_start - dma_offset;
1437                 len = dma_end - dma_start;
1438                 *size = max(len, len + 1);
1439                 *offset = dma_offset;
1440         }
1441  out:
1442         acpi_dev_free_resource_list(&list);
1443
1444         return ret >= 0 ? 0 : ret;
1445 }
1446
1447 /**
1448  * acpi_dma_configure - Set-up DMA configuration for the device.
1449  * @dev: The pointer to the device
1450  * @attr: device dma attributes
1451  */
1452 int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
1453 {
1454         const struct iommu_ops *iommu;
1455         u64 dma_addr = 0, size = 0;
1456
1457         if (attr == DEV_DMA_NOT_SUPPORTED) {
1458                 set_dma_ops(dev, &dma_dummy_ops);
1459                 return 0;
1460         }
1461
1462         iort_dma_setup(dev, &dma_addr, &size);
1463
1464         iommu = iort_iommu_configure(dev);
1465         if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
1466                 return -EPROBE_DEFER;
1467
1468         arch_setup_dma_ops(dev, dma_addr, size,
1469                                 iommu, attr == DEV_DMA_COHERENT);
1470
1471         return 0;
1472 }
1473 EXPORT_SYMBOL_GPL(acpi_dma_configure);
1474
1475 static void acpi_init_coherency(struct acpi_device *adev)
1476 {
1477         unsigned long long cca = 0;
1478         acpi_status status;
1479         struct acpi_device *parent = adev->parent;
1480
1481         if (parent && parent->flags.cca_seen) {
1482                 /*
1483                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1484                  * already saw one.
1485                  */
1486                 adev->flags.cca_seen = 1;
1487                 cca = parent->flags.coherent_dma;
1488         } else {
1489                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1490                                                NULL, &cca);
1491                 if (ACPI_SUCCESS(status))
1492                         adev->flags.cca_seen = 1;
1493                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1494                         /*
1495                          * If architecture does not specify that _CCA is
1496                          * required for DMA-able devices (e.g. x86),
1497                          * we default to _CCA=1.
1498                          */
1499                         cca = 1;
1500                 else
1501                         acpi_handle_debug(adev->handle,
1502                                           "ACPI device is missing _CCA.\n");
1503         }
1504
1505         adev->flags.coherent_dma = cca;
1506 }
1507
1508 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1509 {
1510         bool *is_serial_bus_slave_p = data;
1511
1512         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1513                 return 1;
1514
1515         *is_serial_bus_slave_p = true;
1516
1517          /* no need to do more checking */
1518         return -1;
1519 }
1520
1521 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1522 {
1523         struct acpi_device *parent = device->parent;
1524         static const struct acpi_device_id indirect_io_hosts[] = {
1525                 {"HISI0191", 0},
1526                 {}
1527         };
1528
1529         return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1530 }
1531
1532 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1533 {
1534         struct list_head resource_list;
1535         bool is_serial_bus_slave = false;
1536         /*
1537          * These devices have multiple I2cSerialBus resources and an i2c-client
1538          * must be instantiated for each, each with its own i2c_device_id.
1539          * Normally we only instantiate an i2c-client for the first resource,
1540          * using the ACPI HID as id. These special cases are handled by the
1541          * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
1542          * which i2c_device_id to use for each resource.
1543          */
1544         static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
1545                 {"BSG1160", },
1546                 {"BSG2150", },
1547                 {"INT33FE", },
1548                 {"INT3515", },
1549                 {}
1550         };
1551
1552         if (acpi_is_indirect_io_slave(device))
1553                 return true;
1554
1555         /* Macs use device properties in lieu of _CRS resources */
1556         if (x86_apple_machine &&
1557             (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1558              fwnode_property_present(&device->fwnode, "i2cAddress") ||
1559              fwnode_property_present(&device->fwnode, "baud")))
1560                 return true;
1561
1562         /* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */
1563         if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
1564                 return false;
1565
1566         INIT_LIST_HEAD(&resource_list);
1567         acpi_dev_get_resources(device, &resource_list,
1568                                acpi_check_serial_bus_slave,
1569                                &is_serial_bus_slave);
1570         acpi_dev_free_resource_list(&resource_list);
1571
1572         return is_serial_bus_slave;
1573 }
1574
1575 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1576                              int type, unsigned long long sta)
1577 {
1578         INIT_LIST_HEAD(&device->pnp.ids);
1579         device->device_type = type;
1580         device->handle = handle;
1581         device->parent = acpi_bus_get_parent(handle);
1582         device->fwnode.ops = &acpi_device_fwnode_ops;
1583         acpi_set_device_status(device, sta);
1584         acpi_device_get_busid(device);
1585         acpi_set_pnp_ids(handle, &device->pnp, type);
1586         acpi_init_properties(device);
1587         acpi_bus_get_flags(device);
1588         device->flags.match_driver = false;
1589         device->flags.initialized = true;
1590         device->flags.enumeration_by_parent =
1591                 acpi_device_enumeration_by_parent(device);
1592         acpi_device_clear_enumerated(device);
1593         device_initialize(&device->dev);
1594         dev_set_uevent_suppress(&device->dev, true);
1595         acpi_init_coherency(device);
1596         /* Assume there are unmet deps until acpi_device_dep_initialize() runs */
1597         device->dep_unmet = 1;
1598 }
1599
1600 void acpi_device_add_finalize(struct acpi_device *device)
1601 {
1602         dev_set_uevent_suppress(&device->dev, false);
1603         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1604 }
1605
1606 static int acpi_add_single_object(struct acpi_device **child,
1607                                   acpi_handle handle, int type,
1608                                   unsigned long long sta)
1609 {
1610         int result;
1611         struct acpi_device *device;
1612         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1613
1614         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1615         if (!device) {
1616                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1617                 return -ENOMEM;
1618         }
1619
1620         acpi_init_device_object(device, handle, type, sta);
1621         /*
1622          * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so
1623          * that we can call acpi_bus_get_status() and use its quirk handling.
1624          * Note this must be done before the get power-/wakeup_dev-flags calls.
1625          */
1626         if (type == ACPI_BUS_TYPE_DEVICE)
1627                 if (acpi_bus_get_status(device) < 0)
1628                         acpi_set_device_status(device, 0);
1629
1630         acpi_bus_get_power_flags(device);
1631         acpi_bus_get_wakeup_device_flags(device);
1632
1633         result = acpi_device_add(device, acpi_device_release);
1634         if (result) {
1635                 acpi_device_release(&device->dev);
1636                 return result;
1637         }
1638
1639         acpi_power_add_remove_device(device, true);
1640         acpi_device_add_finalize(device);
1641         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1642         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1643                 dev_name(&device->dev), (char *) buffer.pointer,
1644                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1645         kfree(buffer.pointer);
1646         *child = device;
1647         return 0;
1648 }
1649
1650 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1651                                             void *context)
1652 {
1653         struct resource *res = context;
1654
1655         if (acpi_dev_resource_memory(ares, res))
1656                 return AE_CTRL_TERMINATE;
1657
1658         return AE_OK;
1659 }
1660
1661 static bool acpi_device_should_be_hidden(acpi_handle handle)
1662 {
1663         acpi_status status;
1664         struct resource res;
1665
1666         /* Check if it should ignore the UART device */
1667         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1668                 return false;
1669
1670         /*
1671          * The UART device described in SPCR table is assumed to have only one
1672          * memory resource present. So we only look for the first one here.
1673          */
1674         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1675                                      acpi_get_resource_memory, &res);
1676         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1677                 return false;
1678
1679         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1680                          &res.start);
1681
1682         return true;
1683 }
1684
1685 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1686                                     unsigned long long *sta)
1687 {
1688         acpi_status status;
1689         acpi_object_type acpi_type;
1690
1691         status = acpi_get_type(handle, &acpi_type);
1692         if (ACPI_FAILURE(status))
1693                 return -ENODEV;
1694
1695         switch (acpi_type) {
1696         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1697         case ACPI_TYPE_DEVICE:
1698                 if (acpi_device_should_be_hidden(handle))
1699                         return -ENODEV;
1700
1701                 *type = ACPI_BUS_TYPE_DEVICE;
1702                 /*
1703                  * acpi_add_single_object updates this once we've an acpi_device
1704                  * so that acpi_bus_get_status' quirk handling can be used.
1705                  */
1706                 *sta = ACPI_STA_DEFAULT;
1707                 break;
1708         case ACPI_TYPE_PROCESSOR:
1709                 *type = ACPI_BUS_TYPE_PROCESSOR;
1710                 status = acpi_bus_get_status_handle(handle, sta);
1711                 if (ACPI_FAILURE(status))
1712                         return -ENODEV;
1713                 break;
1714         case ACPI_TYPE_THERMAL:
1715                 *type = ACPI_BUS_TYPE_THERMAL;
1716                 *sta = ACPI_STA_DEFAULT;
1717                 break;
1718         case ACPI_TYPE_POWER:
1719                 *type = ACPI_BUS_TYPE_POWER;
1720                 *sta = ACPI_STA_DEFAULT;
1721                 break;
1722         default:
1723                 return -ENODEV;
1724         }
1725
1726         return 0;
1727 }
1728
1729 bool acpi_device_is_present(const struct acpi_device *adev)
1730 {
1731         return adev->status.present || adev->status.functional;
1732 }
1733
1734 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1735                                        const char *idstr,
1736                                        const struct acpi_device_id **matchid)
1737 {
1738         const struct acpi_device_id *devid;
1739
1740         if (handler->match)
1741                 return handler->match(idstr, matchid);
1742
1743         for (devid = handler->ids; devid->id[0]; devid++)
1744                 if (!strcmp((char *)devid->id, idstr)) {
1745                         if (matchid)
1746                                 *matchid = devid;
1747
1748                         return true;
1749                 }
1750
1751         return false;
1752 }
1753
1754 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1755                                         const struct acpi_device_id **matchid)
1756 {
1757         struct acpi_scan_handler *handler;
1758
1759         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1760                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1761                         return handler;
1762
1763         return NULL;
1764 }
1765
1766 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1767 {
1768         if (!!hotplug->enabled == !!val)
1769                 return;
1770
1771         mutex_lock(&acpi_scan_lock);
1772
1773         hotplug->enabled = val;
1774
1775         mutex_unlock(&acpi_scan_lock);
1776 }
1777
1778 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1779 {
1780         struct acpi_hardware_id *hwid;
1781
1782         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1783                 acpi_dock_add(adev);
1784                 return;
1785         }
1786         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1787                 struct acpi_scan_handler *handler;
1788
1789                 handler = acpi_scan_match_handler(hwid->id, NULL);
1790                 if (handler) {
1791                         adev->flags.hotplug_notify = true;
1792                         break;
1793                 }
1794         }
1795 }
1796
1797 static void acpi_device_dep_initialize(struct acpi_device *adev)
1798 {
1799         struct acpi_dep_data *dep;
1800         struct acpi_handle_list dep_devices;
1801         acpi_status status;
1802         int i;
1803
1804         adev->dep_unmet = 0;
1805
1806         if (!acpi_has_method(adev->handle, "_DEP"))
1807                 return;
1808
1809         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1810                                         &dep_devices);
1811         if (ACPI_FAILURE(status)) {
1812                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1813                 return;
1814         }
1815
1816         for (i = 0; i < dep_devices.count; i++) {
1817                 struct acpi_device_info *info;
1818                 int skip;
1819
1820                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1821                 if (ACPI_FAILURE(status)) {
1822                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1823                         continue;
1824                 }
1825
1826                 /*
1827                  * Skip the dependency of Windows System Power
1828                  * Management Controller
1829                  */
1830                 skip = info->valid & ACPI_VALID_HID &&
1831                         !strcmp(info->hardware_id.string, "INT3396");
1832
1833                 kfree(info);
1834
1835                 if (skip)
1836                         continue;
1837
1838                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1839                 if (!dep)
1840                         return;
1841
1842                 dep->master = dep_devices.handles[i];
1843                 dep->slave  = adev->handle;
1844                 adev->dep_unmet++;
1845
1846                 mutex_lock(&acpi_dep_list_lock);
1847                 list_add_tail(&dep->node , &acpi_dep_list);
1848                 mutex_unlock(&acpi_dep_list_lock);
1849         }
1850 }
1851
1852 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1853                                       void *not_used, void **return_value)
1854 {
1855         struct acpi_device *device = NULL;
1856         int type;
1857         unsigned long long sta;
1858         int result;
1859
1860         acpi_bus_get_device(handle, &device);
1861         if (device)
1862                 goto out;
1863
1864         result = acpi_bus_type_and_status(handle, &type, &sta);
1865         if (result)
1866                 return AE_OK;
1867
1868         if (type == ACPI_BUS_TYPE_POWER) {
1869                 acpi_add_power_resource(handle);
1870                 return AE_OK;
1871         }
1872
1873         acpi_add_single_object(&device, handle, type, sta);
1874         if (!device)
1875                 return AE_CTRL_DEPTH;
1876
1877         acpi_scan_init_hotplug(device);
1878         acpi_device_dep_initialize(device);
1879
1880  out:
1881         if (!*return_value)
1882                 *return_value = device;
1883
1884         return AE_OK;
1885 }
1886
1887 static void acpi_default_enumeration(struct acpi_device *device)
1888 {
1889         /*
1890          * Do not enumerate devices with enumeration_by_parent flag set as
1891          * they will be enumerated by their respective parents.
1892          */
1893         if (!device->flags.enumeration_by_parent) {
1894                 acpi_create_platform_device(device, NULL);
1895                 acpi_device_set_enumerated(device);
1896         } else {
1897                 blocking_notifier_call_chain(&acpi_reconfig_chain,
1898                                              ACPI_RECONFIG_DEVICE_ADD, device);
1899         }
1900 }
1901
1902 static const struct acpi_device_id generic_device_ids[] = {
1903         {ACPI_DT_NAMESPACE_HID, },
1904         {"", },
1905 };
1906
1907 static int acpi_generic_device_attach(struct acpi_device *adev,
1908                                       const struct acpi_device_id *not_used)
1909 {
1910         /*
1911          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1912          * below can be unconditional.
1913          */
1914         if (adev->data.of_compatible)
1915                 acpi_default_enumeration(adev);
1916
1917         return 1;
1918 }
1919
1920 static struct acpi_scan_handler generic_device_handler = {
1921         .ids = generic_device_ids,
1922         .attach = acpi_generic_device_attach,
1923 };
1924
1925 static int acpi_scan_attach_handler(struct acpi_device *device)
1926 {
1927         struct acpi_hardware_id *hwid;
1928         int ret = 0;
1929
1930         list_for_each_entry(hwid, &device->pnp.ids, list) {
1931                 const struct acpi_device_id *devid;
1932                 struct acpi_scan_handler *handler;
1933
1934                 handler = acpi_scan_match_handler(hwid->id, &devid);
1935                 if (handler) {
1936                         if (!handler->attach) {
1937                                 device->pnp.type.platform_id = 0;
1938                                 continue;
1939                         }
1940                         device->handler = handler;
1941                         ret = handler->attach(device, devid);
1942                         if (ret > 0)
1943                                 break;
1944
1945                         device->handler = NULL;
1946                         if (ret < 0)
1947                                 break;
1948                 }
1949         }
1950
1951         return ret;
1952 }
1953
1954 static void acpi_bus_attach(struct acpi_device *device)
1955 {
1956         struct acpi_device *child;
1957         acpi_handle ejd;
1958         int ret;
1959
1960         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1961                 register_dock_dependent_device(device, ejd);
1962
1963         acpi_bus_get_status(device);
1964         /* Skip devices that are not present. */
1965         if (!acpi_device_is_present(device)) {
1966                 device->flags.initialized = false;
1967                 acpi_device_clear_enumerated(device);
1968                 device->flags.power_manageable = 0;
1969                 return;
1970         }
1971         if (device->handler)
1972                 goto ok;
1973
1974         if (!device->flags.initialized) {
1975                 device->flags.power_manageable =
1976                         device->power.states[ACPI_STATE_D0].flags.valid;
1977                 if (acpi_bus_init_power(device))
1978                         device->flags.power_manageable = 0;
1979
1980                 device->flags.initialized = true;
1981         } else if (device->flags.visited) {
1982                 goto ok;
1983         }
1984
1985         ret = acpi_scan_attach_handler(device);
1986         if (ret < 0)
1987                 return;
1988
1989         device->flags.match_driver = true;
1990         if (ret > 0 && !device->flags.enumeration_by_parent) {
1991                 acpi_device_set_enumerated(device);
1992                 goto ok;
1993         }
1994
1995         ret = device_attach(&device->dev);
1996         if (ret < 0)
1997                 return;
1998
1999         if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2000                 acpi_default_enumeration(device);
2001         else
2002                 acpi_device_set_enumerated(device);
2003
2004  ok:
2005         list_for_each_entry(child, &device->children, node)
2006                 acpi_bus_attach(child);
2007
2008         if (device->handler && device->handler->hotplug.notify_online)
2009                 device->handler->hotplug.notify_online(device);
2010 }
2011
2012 void acpi_walk_dep_device_list(acpi_handle handle)
2013 {
2014         struct acpi_dep_data *dep, *tmp;
2015         struct acpi_device *adev;
2016
2017         mutex_lock(&acpi_dep_list_lock);
2018         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2019                 if (dep->master == handle) {
2020                         acpi_bus_get_device(dep->slave, &adev);
2021                         if (!adev)
2022                                 continue;
2023
2024                         adev->dep_unmet--;
2025                         if (!adev->dep_unmet)
2026                                 acpi_bus_attach(adev);
2027                         list_del(&dep->node);
2028                         kfree(dep);
2029                 }
2030         }
2031         mutex_unlock(&acpi_dep_list_lock);
2032 }
2033 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2034
2035 /**
2036  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2037  * @handle: Root of the namespace scope to scan.
2038  *
2039  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2040  * found devices.
2041  *
2042  * If no devices were found, -ENODEV is returned, but it does not mean that
2043  * there has been a real error.  There just have been no suitable ACPI objects
2044  * in the table trunk from which the kernel could create a device and add an
2045  * appropriate driver.
2046  *
2047  * Must be called under acpi_scan_lock.
2048  */
2049 int acpi_bus_scan(acpi_handle handle)
2050 {
2051         void *device = NULL;
2052
2053         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2054                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2055                                     acpi_bus_check_add, NULL, NULL, &device);
2056
2057         if (device) {
2058                 acpi_bus_attach(device);
2059                 return 0;
2060         }
2061         return -ENODEV;
2062 }
2063 EXPORT_SYMBOL(acpi_bus_scan);
2064
2065 /**
2066  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2067  * @adev: Root of the ACPI namespace scope to walk.
2068  *
2069  * Must be called under acpi_scan_lock.
2070  */
2071 void acpi_bus_trim(struct acpi_device *adev)
2072 {
2073         struct acpi_scan_handler *handler = adev->handler;
2074         struct acpi_device *child;
2075
2076         list_for_each_entry_reverse(child, &adev->children, node)
2077                 acpi_bus_trim(child);
2078
2079         adev->flags.match_driver = false;
2080         if (handler) {
2081                 if (handler->detach)
2082                         handler->detach(adev);
2083
2084                 adev->handler = NULL;
2085         } else {
2086                 device_release_driver(&adev->dev);
2087         }
2088         /*
2089          * Most likely, the device is going away, so put it into D3cold before
2090          * that.
2091          */
2092         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2093         adev->flags.initialized = false;
2094         acpi_device_clear_enumerated(adev);
2095 }
2096 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2097
2098 int acpi_bus_register_early_device(int type)
2099 {
2100         struct acpi_device *device = NULL;
2101         int result;
2102
2103         result = acpi_add_single_object(&device, NULL,
2104                                         type, ACPI_STA_DEFAULT);
2105         if (result)
2106                 return result;
2107
2108         device->flags.match_driver = true;
2109         return device_attach(&device->dev);
2110 }
2111 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2112
2113 static int acpi_bus_scan_fixed(void)
2114 {
2115         int result = 0;
2116
2117         /*
2118          * Enumerate all fixed-feature devices.
2119          */
2120         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2121                 struct acpi_device *device = NULL;
2122
2123                 result = acpi_add_single_object(&device, NULL,
2124                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2125                                                 ACPI_STA_DEFAULT);
2126                 if (result)
2127                         return result;
2128
2129                 device->flags.match_driver = true;
2130                 result = device_attach(&device->dev);
2131                 if (result < 0)
2132                         return result;
2133
2134                 device_init_wakeup(&device->dev, true);
2135         }
2136
2137         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2138                 struct acpi_device *device = NULL;
2139
2140                 result = acpi_add_single_object(&device, NULL,
2141                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2142                                                 ACPI_STA_DEFAULT);
2143                 if (result)
2144                         return result;
2145
2146                 device->flags.match_driver = true;
2147                 result = device_attach(&device->dev);
2148         }
2149
2150         return result < 0 ? result : 0;
2151 }
2152
2153 static void __init acpi_get_spcr_uart_addr(void)
2154 {
2155         acpi_status status;
2156         struct acpi_table_spcr *spcr_ptr;
2157
2158         status = acpi_get_table(ACPI_SIG_SPCR, 0,
2159                                 (struct acpi_table_header **)&spcr_ptr);
2160         if (ACPI_SUCCESS(status))
2161                 spcr_uart_addr = spcr_ptr->serial_port.address;
2162         else
2163                 printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
2164 }
2165
2166 static bool acpi_scan_initialized;
2167
2168 int __init acpi_scan_init(void)
2169 {
2170         int result;
2171         acpi_status status;
2172         struct acpi_table_stao *stao_ptr;
2173
2174         acpi_pci_root_init();
2175         acpi_pci_link_init();
2176         acpi_processor_init();
2177         acpi_lpss_init();
2178         acpi_apd_init();
2179         acpi_cmos_rtc_init();
2180         acpi_container_init();
2181         acpi_memory_hotplug_init();
2182         acpi_watchdog_init();
2183         acpi_pnp_init();
2184         acpi_int340x_thermal_init();
2185         acpi_amba_init();
2186         acpi_init_lpit();
2187
2188         acpi_scan_add_handler(&generic_device_handler);
2189
2190         /*
2191          * If there is STAO table, check whether it needs to ignore the UART
2192          * device in SPCR table.
2193          */
2194         status = acpi_get_table(ACPI_SIG_STAO, 0,
2195                                 (struct acpi_table_header **)&stao_ptr);
2196         if (ACPI_SUCCESS(status)) {
2197                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2198                         printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
2199
2200                 if (stao_ptr->ignore_uart)
2201                         acpi_get_spcr_uart_addr();
2202         }
2203
2204         acpi_gpe_apply_masked_gpes();
2205         acpi_update_all_gpes();
2206
2207         /*
2208          * Although we call __add_memory() that is documented to require the
2209          * device_hotplug_lock, it is not necessary here because this is an
2210          * early code when userspace or any other code path cannot trigger
2211          * hotplug/hotunplug operations.
2212          */
2213         mutex_lock(&acpi_scan_lock);
2214         /*
2215          * Enumerate devices in the ACPI namespace.
2216          */
2217         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2218         if (result)
2219                 goto out;
2220
2221         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2222         if (result)
2223                 goto out;
2224
2225         /* Fixed feature devices do not exist on HW-reduced platform */
2226         if (!acpi_gbl_reduced_hardware) {
2227                 result = acpi_bus_scan_fixed();
2228                 if (result) {
2229                         acpi_detach_data(acpi_root->handle,
2230                                          acpi_scan_drop_device);
2231                         acpi_device_del(acpi_root);
2232                         put_device(&acpi_root->dev);
2233                         goto out;
2234                 }
2235         }
2236
2237         acpi_scan_initialized = true;
2238
2239  out:
2240         mutex_unlock(&acpi_scan_lock);
2241         return result;
2242 }
2243
2244 static struct acpi_probe_entry *ape;
2245 static int acpi_probe_count;
2246 static DEFINE_MUTEX(acpi_probe_mutex);
2247
2248 static int __init acpi_match_madt(union acpi_subtable_headers *header,
2249                                   const unsigned long end)
2250 {
2251         if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2252                 if (!ape->probe_subtbl(header, end))
2253                         acpi_probe_count++;
2254
2255         return 0;
2256 }
2257
2258 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2259 {
2260         int count = 0;
2261
2262         if (acpi_disabled)
2263                 return 0;
2264
2265         mutex_lock(&acpi_probe_mutex);
2266         for (ape = ap_head; nr; ape++, nr--) {
2267                 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2268                         acpi_probe_count = 0;
2269                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2270                         count += acpi_probe_count;
2271                 } else {
2272                         int res;
2273                         res = acpi_table_parse(ape->id, ape->probe_table);
2274                         if (!res)
2275                                 count++;
2276                 }
2277         }
2278         mutex_unlock(&acpi_probe_mutex);
2279
2280         return count;
2281 }
2282
2283 struct acpi_table_events_work {
2284         struct work_struct work;
2285         void *table;
2286         u32 event;
2287 };
2288
2289 static void acpi_table_events_fn(struct work_struct *work)
2290 {
2291         struct acpi_table_events_work *tew;
2292
2293         tew = container_of(work, struct acpi_table_events_work, work);
2294
2295         if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2296                 acpi_scan_lock_acquire();
2297                 acpi_bus_scan(ACPI_ROOT_OBJECT);
2298                 acpi_scan_lock_release();
2299         }
2300
2301         kfree(tew);
2302 }
2303
2304 void acpi_scan_table_handler(u32 event, void *table, void *context)
2305 {
2306         struct acpi_table_events_work *tew;
2307
2308         if (!acpi_scan_initialized)
2309                 return;
2310
2311         if (event != ACPI_TABLE_EVENT_LOAD)
2312                 return;
2313
2314         tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2315         if (!tew)
2316                 return;
2317
2318         INIT_WORK(&tew->work, acpi_table_events_fn);
2319         tew->table = table;
2320         tew->event = event;
2321
2322         schedule_work(&tew->work);
2323 }
2324
2325 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2326 {
2327         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2328 }
2329 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2330
2331 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2332 {
2333         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2334 }
2335 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);