drivers/acpi/scan.c

   1 /*
   2  * scan.c - support for transforming the ACPI namespace into individual objects
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/init.h>
   7 #include <linux/slab.h>
   8 #include <linux/kernel.h>
   9 #include <linux/acpi.h>
  10 #include <linux/signal.h>
  11 #include <linux/kthread.h>
  12 #include <linux/dmi.h>
  13 #include <linux/nls.h>
  14 #include <linux/dma-mapping.h>
  15
  16 #include <asm/pgtable.h>
  17
  18 #include "internal.h"
  19
  20 #define _COMPONENT              ACPI_BUS_COMPONENT
  21 ACPI_MODULE_NAME("scan");
  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 /*
  33  * If set, devices will be hot-removed even if they cannot be put offline
  34  * gracefully (from the kernel's standpoint).
  35  */
  36 bool acpi_force_hot_remove;
  37
  38 static const char *dummy_hid = "device";
  39
  40 static LIST_HEAD(acpi_dep_list);
  41 static DEFINE_MUTEX(acpi_dep_list_lock);
  42 LIST_HEAD(acpi_bus_id_list);
  43 static DEFINE_MUTEX(acpi_scan_lock);
  44 static LIST_HEAD(acpi_scan_handlers_list);
  45 DEFINE_MUTEX(acpi_device_lock);
  46 LIST_HEAD(acpi_wakeup_device_list);
  47 static DEFINE_MUTEX(acpi_hp_context_lock);
  48
  49 /*
  50  * The UART device described by the SPCR table is the only object which needs
  51  * special-casing. Everything else is covered by ACPI namespace paths in STAO
  52  * table.
  53  */
  54 static u64 spcr_uart_addr;
  55
  56 struct acpi_dep_data {
  57         struct list_head node;
  58         acpi_handle master;
  59         acpi_handle slave;
  60 };
  61
  62 void acpi_scan_lock_acquire(void)
  63 {
  64         mutex_lock(&acpi_scan_lock);
  65 }
  66 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  67
  68 void acpi_scan_lock_release(void)
  69 {
  70         mutex_unlock(&acpi_scan_lock);
  71 }
  72 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  73
  74 void acpi_lock_hp_context(void)
  75 {
  76         mutex_lock(&acpi_hp_context_lock);
  77 }
  78
  79 void acpi_unlock_hp_context(void)
  80 {
  81         mutex_unlock(&acpi_hp_context_lock);
  82 }
  83
  84 void acpi_initialize_hp_context(struct acpi_device *adev,
  85                                 struct acpi_hotplug_context *hp,
  86                                 int (*notify)(struct acpi_device *, u32),
  87                                 void (*uevent)(struct acpi_device *, u32))
  88 {
  89         acpi_lock_hp_context();
  90         hp->notify = notify;
  91         hp->uevent = uevent;
  92         acpi_set_hp_context(adev, hp);
  93         acpi_unlock_hp_context();
  94 }
  95 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
  96
  97 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  98 {
  99         if (!handler)
 100                 return -EINVAL;
 101
 102         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
 103         return 0;
 104 }
 105
 106 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
 107                                        const char *hotplug_profile_name)
 108 {
 109         int error;
 110
 111         error = acpi_scan_add_handler(handler);
 112         if (error)
 113                 return error;
 114
 115         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
 116         return 0;
 117 }
 118
 119 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 120 {
 121         struct acpi_device_physical_node *pn;
 122         bool offline = true;
 123
 124         /*
 125          * acpi_container_offline() calls this for all of the container's
 126          * children under the container's physical_node_lock lock.
 127          */
 128         mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
 129
 130         list_for_each_entry(pn, &adev->physical_node_list, node)
 131                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
 132                         if (uevent)
 133                                 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
 134
 135                         offline = false;
 136                         break;
 137                 }
 138
 139         mutex_unlock(&adev->physical_node_lock);
 140         return offline;
 141 }
 142
 143 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 144                                     void **ret_p)
 145 {
 146         struct acpi_device *device = NULL;
 147         struct acpi_device_physical_node *pn;
 148         bool second_pass = (bool)data;
 149         acpi_status status = AE_OK;
 150
 151         if (acpi_bus_get_device(handle, &device))
 152                 return AE_OK;
 153
 154         if (device->handler && !device->handler->hotplug.enabled) {
 155                 *ret_p = &device->dev;
 156                 return AE_SUPPORT;
 157         }
 158
 159         mutex_lock(&device->physical_node_lock);
 160
 161         list_for_each_entry(pn, &device->physical_node_list, node) {
 162                 int ret;
 163
 164                 if (second_pass) {
 165                         /* Skip devices offlined by the first pass. */
 166                         if (pn->put_online)
 167                                 continue;
 168                 } else {
 169                         pn->put_online = false;
 170                 }
 171                 ret = device_offline(pn->dev);
 172                 if (acpi_force_hot_remove)
 173                         continue;
 174
 175                 if (ret >= 0) {
 176                         pn->put_online = !ret;
 177                 } else {
 178                         *ret_p = pn->dev;
 179                         if (second_pass) {
 180                                 status = AE_ERROR;
 181                                 break;
 182                         }
 183                 }
 184         }
 185
 186         mutex_unlock(&device->physical_node_lock);
 187
 188         return status;
 189 }
 190
 191 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 192                                    void **ret_p)
 193 {
 194         struct acpi_device *device = NULL;
 195         struct acpi_device_physical_node *pn;
 196
 197         if (acpi_bus_get_device(handle, &device))
 198                 return AE_OK;
 199
 200         mutex_lock(&device->physical_node_lock);
 201
 202         list_for_each_entry(pn, &device->physical_node_list, node)
 203                 if (pn->put_online) {
 204                         device_online(pn->dev);
 205                         pn->put_online = false;
 206                 }
 207
 208         mutex_unlock(&device->physical_node_lock);
 209
 210         return AE_OK;
 211 }
 212
 213 static int acpi_scan_try_to_offline(struct acpi_device *device)
 214 {
 215         acpi_handle handle = device->handle;
 216         struct device *errdev = NULL;
 217         acpi_status status;
 218
 219         /*
 220          * Carry out two passes here and ignore errors in the first pass,
 221          * because if the devices in question are memory blocks and
 222          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 223          * that the other blocks depend on, but it is not known in advance which
 224          * block holds them.
 225          *
 226          * If the first pass is successful, the second one isn't needed, though.
 227          */
 228         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 229                                      NULL, acpi_bus_offline, (void *)false,
 230                                      (void **)&errdev);
 231         if (status == AE_SUPPORT) {
 232                 dev_warn(errdev, "Offline disabled.\n");
 233                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 234                                     acpi_bus_online, NULL, NULL, NULL);
 235                 return -EPERM;
 236         }
 237         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
 238         if (errdev) {
 239                 errdev = NULL;
 240                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 241                                     NULL, acpi_bus_offline, (void *)true,
 242                                     (void **)&errdev);
 243                 if (!errdev || acpi_force_hot_remove)
 244                         acpi_bus_offline(handle, 0, (void *)true,
 245                                          (void **)&errdev);
 246
 247                 if (errdev && !acpi_force_hot_remove) {
 248                         dev_warn(errdev, "Offline failed.\n");
 249                         acpi_bus_online(handle, 0, NULL, NULL);
 250                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 251                                             ACPI_UINT32_MAX, acpi_bus_online,
 252                                             NULL, NULL, NULL);
 253                         return -EBUSY;
 254                 }
 255         }
 256         return 0;
 257 }
 258
 259 static int acpi_scan_hot_remove(struct acpi_device *device)
 260 {
 261         acpi_handle handle = device->handle;
 262         unsigned long long sta;
 263         acpi_status status;
 264
 265         if (device->handler && device->handler->hotplug.demand_offline
 266             && !acpi_force_hot_remove) {
 267                 if (!acpi_scan_is_offline(device, true))
 268                         return -EBUSY;
 269         } else {
 270                 int error = acpi_scan_try_to_offline(device);
 271                 if (error)
 272                         return error;
 273         }
 274
 275         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 276                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 277
 278         acpi_bus_trim(device);
 279
 280         acpi_evaluate_lck(handle, 0);
 281         /*
 282          * TBD: _EJD support.
 283          */
 284         status = acpi_evaluate_ej0(handle);
 285         if (status == AE_NOT_FOUND)
 286                 return -ENODEV;
 287         else if (ACPI_FAILURE(status))
 288                 return -EIO;
 289
 290         /*
 291          * Verify if eject was indeed successful.  If not, log an error
 292          * message.  No need to call _OST since _EJ0 call was made OK.
 293          */
 294         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 295         if (ACPI_FAILURE(status)) {
 296                 acpi_handle_warn(handle,
 297                         "Status check after eject failed (0x%x)\n", status);
 298         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 299                 acpi_handle_warn(handle,
 300                         "Eject incomplete - status 0x%llx\n", sta);
 301         }
 302
 303         return 0;
 304 }
 305
 306 static int acpi_scan_device_not_present(struct acpi_device *adev)
 307 {
 308         if (!acpi_device_enumerated(adev)) {
 309                 dev_warn(&adev->dev, "Still not present\n");
 310                 return -EALREADY;
 311         }
 312         acpi_bus_trim(adev);
 313         return 0;
 314 }
 315
 316 static int acpi_scan_device_check(struct acpi_device *adev)
 317 {
 318         int error;
 319
 320         acpi_bus_get_status(adev);
 321         if (adev->status.present || adev->status.functional) {
 322                 /*
 323                  * This function is only called for device objects for which
 324                  * matching scan handlers exist.  The only situation in which
 325                  * the scan handler is not attached to this device object yet
 326                  * is when the device has just appeared (either it wasn't
 327                  * present at all before or it was removed and then added
 328                  * again).
 329                  */
 330                 if (adev->handler) {
 331                         dev_warn(&adev->dev, "Already enumerated\n");
 332                         return -EALREADY;
 333                 }
 334                 error = acpi_bus_scan(adev->handle);
 335                 if (error) {
 336                         dev_warn(&adev->dev, "Namespace scan failure\n");
 337                         return error;
 338                 }
 339                 if (!adev->handler) {
 340                         dev_warn(&adev->dev, "Enumeration failure\n");
 341                         error = -ENODEV;
 342                 }
 343         } else {
 344                 error = acpi_scan_device_not_present(adev);
 345         }
 346         return error;
 347 }
 348
 349 static int acpi_scan_bus_check(struct acpi_device *adev)
 350 {
 351         struct acpi_scan_handler *handler = adev->handler;
 352         struct acpi_device *child;
 353         int error;
 354
 355         acpi_bus_get_status(adev);
 356         if (!(adev->status.present || adev->status.functional)) {
 357                 acpi_scan_device_not_present(adev);
 358                 return 0;
 359         }
 360         if (handler && handler->hotplug.scan_dependent)
 361                 return handler->hotplug.scan_dependent(adev);
 362
 363         error = acpi_bus_scan(adev->handle);
 364         if (error) {
 365                 dev_warn(&adev->dev, "Namespace scan failure\n");
 366                 return error;
 367         }
 368         list_for_each_entry(child, &adev->children, node) {
 369                 error = acpi_scan_bus_check(child);
 370                 if (error)
 371                         return error;
 372         }
 373         return 0;
 374 }
 375
 376 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 377 {
 378         switch (type) {
 379         case ACPI_NOTIFY_BUS_CHECK:
 380                 return acpi_scan_bus_check(adev);
 381         case ACPI_NOTIFY_DEVICE_CHECK:
 382                 return acpi_scan_device_check(adev);
 383         case ACPI_NOTIFY_EJECT_REQUEST:
 384         case ACPI_OST_EC_OSPM_EJECT:
 385                 if (adev->handler && !adev->handler->hotplug.enabled) {
 386                         dev_info(&adev->dev, "Eject disabled\n");
 387                         return -EPERM;
 388                 }
 389                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 390                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 391                 return acpi_scan_hot_remove(adev);
 392         }
 393         return -EINVAL;
 394 }
 395
 396 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 397 {
 398         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 399         int error = -ENODEV;
 400
 401         lock_device_hotplug();
 402         mutex_lock(&acpi_scan_lock);
 403
 404         /*
 405          * The device object's ACPI handle cannot become invalid as long as we
 406          * are holding acpi_scan_lock, but it might have become invalid before
 407          * that lock was acquired.
 408          */
 409         if (adev->handle == INVALID_ACPI_HANDLE)
 410                 goto err_out;
 411
 412         if (adev->flags.is_dock_station) {
 413                 error = dock_notify(adev, src);
 414         } else if (adev->flags.hotplug_notify) {
 415                 error = acpi_generic_hotplug_event(adev, src);
 416                 if (error == -EPERM) {
 417                         ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 418                         goto err_out;
 419                 }
 420         } else {
 421                 int (*notify)(struct acpi_device *, u32);
 422
 423                 acpi_lock_hp_context();
 424                 notify = adev->hp ? adev->hp->notify : NULL;
 425                 acpi_unlock_hp_context();
 426                 /*
 427                  * There may be additional notify handlers for device objects
 428                  * without the .event() callback, so ignore them here.
 429                  */
 430                 if (notify)
 431                         error = notify(adev, src);
 432                 else
 433                         goto out;
 434         }
 435         if (!error)
 436                 ost_code = ACPI_OST_SC_SUCCESS;
 437
 438  err_out:
 439         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 440
 441  out:
 442         acpi_bus_put_acpi_device(adev);
 443         mutex_unlock(&acpi_scan_lock);
 444         unlock_device_hotplug();
 445 }
 446
 447 static void acpi_free_power_resources_lists(struct acpi_device *device)
 448 {
 449         int i;
 450
 451         if (device->wakeup.flags.valid)
 452                 acpi_power_resources_list_free(&device->wakeup.resources);
 453
 454         if (!device->power.flags.power_resources)
 455                 return;
 456
 457         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 458                 struct acpi_device_power_state *ps = &device->power.states[i];
 459                 acpi_power_resources_list_free(&ps->resources);
 460         }
 461 }
 462
 463 static void acpi_device_release(struct device *dev)
 464 {
 465         struct acpi_device *acpi_dev = to_acpi_device(dev);
 466
 467         acpi_free_properties(acpi_dev);
 468         acpi_free_pnp_ids(&acpi_dev->pnp);
 469         acpi_free_power_resources_lists(acpi_dev);
 470         kfree(acpi_dev);
 471 }
 472
 473 static void acpi_device_del(struct acpi_device *device)
 474 {
 475         struct acpi_device_bus_id *acpi_device_bus_id;
 476
 477         mutex_lock(&acpi_device_lock);
 478         if (device->parent)
 479                 list_del(&device->node);
 480
 481         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
 482                 if (!strcmp(acpi_device_bus_id->bus_id,
 483                             acpi_device_hid(device))) {
 484                         if (acpi_device_bus_id->instance_no > 0)
 485                                 acpi_device_bus_id->instance_no--;
 486                         else {
 487                                 list_del(&acpi_device_bus_id->node);
 488                                 kfree(acpi_device_bus_id);
 489                         }
 490                         break;
 491                 }
 492
 493         list_del(&device->wakeup_list);
 494         mutex_unlock(&acpi_device_lock);
 495
 496         acpi_power_add_remove_device(device, false);
 497         acpi_device_remove_files(device);
 498         if (device->remove)
 499                 device->remove(device);
 500
 501         device_del(&device->dev);
 502 }
 503
 504 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
 505
 506 static LIST_HEAD(acpi_device_del_list);
 507 static DEFINE_MUTEX(acpi_device_del_lock);
 508
 509 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 510 {
 511         for (;;) {
 512                 struct acpi_device *adev;
 513
 514                 mutex_lock(&acpi_device_del_lock);
 515
 516                 if (list_empty(&acpi_device_del_list)) {
 517                         mutex_unlock(&acpi_device_del_lock);
 518                         break;
 519                 }
 520                 adev = list_first_entry(&acpi_device_del_list,
 521                                         struct acpi_device, del_list);
 522                 list_del(&adev->del_list);
 523
 524                 mutex_unlock(&acpi_device_del_lock);
 525
 526                 blocking_notifier_call_chain(&acpi_reconfig_chain,
 527                                              ACPI_RECONFIG_DEVICE_REMOVE, adev);
 528
 529                 acpi_device_del(adev);
 530                 /*
 531                  * Drop references to all power resources that might have been
 532                  * used by the device.
 533                  */
 534                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
 535                 put_device(&adev->dev);
 536         }
 537 }
 538
 539 /**
 540  * acpi_scan_drop_device - Drop an ACPI device object.
 541  * @handle: Handle of an ACPI namespace node, not used.
 542  * @context: Address of the ACPI device object to drop.
 543  *
 544  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
 545  * namespace node the device object pointed to by @context is attached to.
 546  *
 547  * The unregistration is carried out asynchronously to avoid running
 548  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
 549  * ensure the correct ordering (the device objects must be unregistered in the
 550  * same order in which the corresponding namespace nodes are deleted).
 551  */
 552 static void acpi_scan_drop_device(acpi_handle handle, void *context)
 553 {
 554         static DECLARE_WORK(work, acpi_device_del_work_fn);
 555         struct acpi_device *adev = context;
 556
 557         mutex_lock(&acpi_device_del_lock);
 558
 559         /*
 560          * Use the ACPI hotplug workqueue which is ordered, so this work item
 561          * won't run after any hotplug work items submitted subsequently.  That
 562          * prevents attempts to register device objects identical to those being
 563          * deleted from happening concurrently (such attempts result from
 564          * hotplug events handled via the ACPI hotplug workqueue).  It also will
 565          * run after all of the work items submitted previosuly, which helps
 566          * those work items to ensure that they are not accessing stale device
 567          * objects.
 568          */
 569         if (list_empty(&acpi_device_del_list))
 570                 acpi_queue_hotplug_work(&work);
 571
 572         list_add_tail(&adev->del_list, &acpi_device_del_list);
 573         /* Make acpi_ns_validate_handle() return NULL for this handle. */
 574         adev->handle = INVALID_ACPI_HANDLE;
 575
 576         mutex_unlock(&acpi_device_del_lock);
 577 }
 578
 579 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
 580                                 void (*callback)(void *))
 581 {
 582         acpi_status status;
 583
 584         if (!device)
 585                 return -EINVAL;
 586
 587         status = acpi_get_data_full(handle, acpi_scan_drop_device,
 588                                     (void **)device, callback);
 589         if (ACPI_FAILURE(status) || !*device) {
 590                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 591                                   handle));
 592                 return -ENODEV;
 593         }
 594         return 0;
 595 }
 596
 597 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 598 {
 599         return acpi_get_device_data(handle, device, NULL);
 600 }
 601 EXPORT_SYMBOL(acpi_bus_get_device);
 602
 603 static void get_acpi_device(void *dev)
 604 {
 605         if (dev)
 606                 get_device(&((struct acpi_device *)dev)->dev);
 607 }
 608
 609 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 610 {
 611         struct acpi_device *adev = NULL;
 612
 613         acpi_get_device_data(handle, &adev, get_acpi_device);
 614         return adev;
 615 }
 616
 617 void acpi_bus_put_acpi_device(struct acpi_device *adev)
 618 {
 619         put_device(&adev->dev);
 620 }
 621
 622 int acpi_device_add(struct acpi_device *device,
 623                     void (*release)(struct device *))
 624 {
 625         int result;
 626         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 627         int found = 0;
 628
 629         if (device->handle) {
 630                 acpi_status status;
 631
 632                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
 633                                           device);
 634                 if (ACPI_FAILURE(status)) {
 635                         acpi_handle_err(device->handle,
 636                                         "Unable to attach device data\n");
 637                         return -ENODEV;
 638                 }
 639         }
 640
 641         /*
 642          * Linkage
 643          * -------
 644          * Link this device to its parent and siblings.
 645          */
 646         INIT_LIST_HEAD(&device->children);
 647         INIT_LIST_HEAD(&device->node);
 648         INIT_LIST_HEAD(&device->wakeup_list);
 649         INIT_LIST_HEAD(&device->physical_node_list);
 650         INIT_LIST_HEAD(&device->del_list);
 651         mutex_init(&device->physical_node_lock);
 652
 653         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 654         if (!new_bus_id) {
 655                 pr_err(PREFIX "Memory allocation error\n");
 656                 result = -ENOMEM;
 657                 goto err_detach;
 658         }
 659
 660         mutex_lock(&acpi_device_lock);
 661         /*
 662          * Find suitable bus_id and instance number in acpi_bus_id_list
 663          * If failed, create one and link it into acpi_bus_id_list
 664          */
 665         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 666                 if (!strcmp(acpi_device_bus_id->bus_id,
 667                             acpi_device_hid(device))) {
 668                         acpi_device_bus_id->instance_no++;
 669                         found = 1;
 670                         kfree(new_bus_id);
 671                         break;
 672                 }
 673         }
 674         if (!found) {
 675                 acpi_device_bus_id = new_bus_id;
 676                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 677                 acpi_device_bus_id->instance_no = 0;
 678                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 679         }
 680         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 681
 682         if (device->parent)
 683                 list_add_tail(&device->node, &device->parent->children);
 684
 685         if (device->wakeup.flags.valid)
 686                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 687         mutex_unlock(&acpi_device_lock);
 688
 689         if (device->parent)
 690                 device->dev.parent = &device->parent->dev;
 691         device->dev.bus = &acpi_bus_type;
 692         device->dev.release = release;
 693         result = device_add(&device->dev);
 694         if (result) {
 695                 dev_err(&device->dev, "Error registering device\n");
 696                 goto err;
 697         }
 698
 699         result = acpi_device_setup_files(device);
 700         if (result)
 701                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 702                        dev_name(&device->dev));
 703
 704         return 0;
 705
 706  err:
 707         mutex_lock(&acpi_device_lock);
 708         if (device->parent)
 709                 list_del(&device->node);
 710         list_del(&device->wakeup_list);
 711         mutex_unlock(&acpi_device_lock);
 712
 713  err_detach:
 714         acpi_detach_data(device->handle, acpi_scan_drop_device);
 715         return result;
 716 }
 717
 718 /* --------------------------------------------------------------------------
 719                                  Device Enumeration
 720    -------------------------------------------------------------------------- */
 721 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 722 {
 723         struct acpi_device *device = NULL;
 724         acpi_status status;
 725
 726         /*
 727          * Fixed hardware devices do not appear in the namespace and do not
 728          * have handles, but we fabricate acpi_devices for them, so we have
 729          * to deal with them specially.
 730          */
 731         if (!handle)
 732                 return acpi_root;
 733
 734         do {
 735                 status = acpi_get_parent(handle, &handle);
 736                 if (ACPI_FAILURE(status))
 737                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 738         } while (acpi_bus_get_device(handle, &device));
 739         return device;
 740 }
 741
 742 acpi_status
 743 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 744 {
 745         acpi_status status;
 746         acpi_handle tmp;
 747         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 748         union acpi_object *obj;
 749
 750         status = acpi_get_handle(handle, "_EJD", &tmp);
 751         if (ACPI_FAILURE(status))
 752                 return status;
 753
 754         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 755         if (ACPI_SUCCESS(status)) {
 756                 obj = buffer.pointer;
 757                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 758                                          ejd);
 759                 kfree(buffer.pointer);
 760         }
 761         return status;
 762 }
 763 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 764
 765 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 766                                         struct acpi_device_wakeup *wakeup)
 767 {
 768         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 769         union acpi_object *package = NULL;
 770         union acpi_object *element = NULL;
 771         acpi_status status;
 772         int err = -ENODATA;
 773
 774         if (!wakeup)
 775                 return -EINVAL;
 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 void acpi_wakeup_gpe_init(struct acpi_device *device)
 848 {
 849         static const struct acpi_device_id button_device_ids[] = {
 850                 {"PNP0C0C", 0},
 851                 {"PNP0C0D", 0},
 852                 {"PNP0C0E", 0},
 853                 {"", 0},
 854         };
 855         struct acpi_device_wakeup *wakeup = &device->wakeup;
 856         acpi_status status;
 857         acpi_event_status event_status;
 858
 859         wakeup->flags.notifier_present = 0;
 860
 861         /* Power button, Lid switch always enable wakeup */
 862         if (!acpi_match_device_ids(device, button_device_ids)) {
 863                 wakeup->flags.run_wake = 1;
 864                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 865                         /* Do not use Lid/sleep button for S5 wakeup */
 866                         if (wakeup->sleep_state == ACPI_STATE_S5)
 867                                 wakeup->sleep_state = ACPI_STATE_S4;
 868                 }
 869                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 870                 device_set_wakeup_capable(&device->dev, true);
 871                 return;
 872         }
 873
 874         acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 875                                 wakeup->gpe_number);
 876         status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
 877                                      &event_status);
 878         if (ACPI_FAILURE(status))
 879                 return;
 880
 881         wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
 882 }
 883
 884 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 885 {
 886         int err;
 887
 888         /* Presence of _PRW indicates wake capable */
 889         if (!acpi_has_method(device->handle, "_PRW"))
 890                 return;
 891
 892         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
 893                                                            &device->wakeup);
 894         if (err) {
 895                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
 896                 return;
 897         }
 898
 899         device->wakeup.flags.valid = 1;
 900         device->wakeup.prepare_count = 0;
 901         acpi_wakeup_gpe_init(device);
 902         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 903          * system for the ACPI device with the _PRW object.
 904          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 905          * So it is necessary to call _DSW object first. Only when it is not
 906          * present will the _PSW object used.
 907          */
 908         err = acpi_device_sleep_wake(device, 0, 0, 0);
 909         if (err)
 910                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 911                                 "error in _DSW or _PSW evaluation\n"));
 912 }
 913
 914 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 915 {
 916         struct acpi_device_power_state *ps = &device->power.states[state];
 917         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 918         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 919         acpi_status status;
 920
 921         INIT_LIST_HEAD(&ps->resources);
 922
 923         /* Evaluate "_PRx" to get referenced power resources */
 924         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 925         if (ACPI_SUCCESS(status)) {
 926                 union acpi_object *package = buffer.pointer;
 927
 928                 if (buffer.length && package
 929                     && package->type == ACPI_TYPE_PACKAGE
 930                     && package->package.count) {
 931                         int err = acpi_extract_power_resources(package, 0,
 932                                                                &ps->resources);
 933                         if (!err)
 934                                 device->power.flags.power_resources = 1;
 935                 }
 936                 ACPI_FREE(buffer.pointer);
 937         }
 938
 939         /* Evaluate "_PSx" to see if we can do explicit sets */
 940         pathname[2] = 'S';
 941         if (acpi_has_method(device->handle, pathname))
 942                 ps->flags.explicit_set = 1;
 943
 944         /* State is valid if there are means to put the device into it. */
 945         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
 946                 ps->flags.valid = 1;
 947
 948         ps->power = -1;         /* Unknown - driver assigned */
 949         ps->latency = -1;       /* Unknown - driver assigned */
 950 }
 951
 952 static void acpi_bus_get_power_flags(struct acpi_device *device)
 953 {
 954         u32 i;
 955
 956         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 957         if (!acpi_has_method(device->handle, "_PS0") &&
 958             !acpi_has_method(device->handle, "_PR0"))
 959                 return;
 960
 961         device->flags.power_manageable = 1;
 962
 963         /*
 964          * Power Management Flags
 965          */
 966         if (acpi_has_method(device->handle, "_PSC"))
 967                 device->power.flags.explicit_get = 1;
 968
 969         if (acpi_has_method(device->handle, "_IRC"))
 970                 device->power.flags.inrush_current = 1;
 971
 972         if (acpi_has_method(device->handle, "_DSW"))
 973                 device->power.flags.dsw_present = 1;
 974
 975         /*
 976          * Enumerate supported power management states
 977          */
 978         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
 979                 acpi_bus_init_power_state(device, i);
 980
 981         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
 982         if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
 983                 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
 984
 985         /* Set defaults for D0 and D3hot states (always valid) */
 986         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 987         device->power.states[ACPI_STATE_D0].power = 100;
 988         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
 989
 990         if (acpi_bus_init_power(device))
 991                 device->flags.power_manageable = 0;
 992 }
 993
 994 static void acpi_bus_get_flags(struct acpi_device *device)
 995 {
 996         /* Presence of _STA indicates 'dynamic_status' */
 997         if (acpi_has_method(device->handle, "_STA"))
 998                 device->flags.dynamic_status = 1;
 999
1000         /* Presence of _RMV indicates 'removable' */
1001         if (acpi_has_method(device->handle, "_RMV"))
1002                 device->flags.removable = 1;
1003
1004         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1005         if (acpi_has_method(device->handle, "_EJD") ||
1006             acpi_has_method(device->handle, "_EJ0"))
1007                 device->flags.ejectable = 1;
1008 }
1009
1010 static void acpi_device_get_busid(struct acpi_device *device)
1011 {
1012         char bus_id[5] = { '?', 0 };
1013         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1014         int i = 0;
1015
1016         /*
1017          * Bus ID
1018          * ------
1019          * The device's Bus ID is simply the object name.
1020          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1021          */
1022         if (ACPI_IS_ROOT_DEVICE(device)) {
1023                 strcpy(device->pnp.bus_id, "ACPI");
1024                 return;
1025         }
1026
1027         switch (device->device_type) {
1028         case ACPI_BUS_TYPE_POWER_BUTTON:
1029                 strcpy(device->pnp.bus_id, "PWRF");
1030                 break;
1031         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1032                 strcpy(device->pnp.bus_id, "SLPF");
1033                 break;
1034         default:
1035                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1036                 /* Clean up trailing underscores (if any) */
1037                 for (i = 3; i > 1; i--) {
1038                         if (bus_id[i] == '_')
1039                                 bus_id[i] = '\0';
1040                         else
1041                                 break;
1042                 }
1043                 strcpy(device->pnp.bus_id, bus_id);
1044                 break;
1045         }
1046 }
1047
1048 /*
1049  * acpi_ata_match - see if an acpi object is an ATA device
1050  *
1051  * If an acpi object has one of the ACPI ATA methods defined,
1052  * then we can safely call it an ATA device.
1053  */
1054 bool acpi_ata_match(acpi_handle handle)
1055 {
1056         return acpi_has_method(handle, "_GTF") ||
1057                acpi_has_method(handle, "_GTM") ||
1058                acpi_has_method(handle, "_STM") ||
1059                acpi_has_method(handle, "_SDD");
1060 }
1061
1062 /*
1063  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1064  *
1065  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1066  * then we can safely call it an ejectable drive bay
1067  */
1068 bool acpi_bay_match(acpi_handle handle)
1069 {
1070         acpi_handle phandle;
1071
1072         if (!acpi_has_method(handle, "_EJ0"))
1073                 return false;
1074         if (acpi_ata_match(handle))
1075                 return true;
1076         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1077                 return false;
1078
1079         return acpi_ata_match(phandle);
1080 }
1081
1082 bool acpi_device_is_battery(struct acpi_device *adev)
1083 {
1084         struct acpi_hardware_id *hwid;
1085
1086         list_for_each_entry(hwid, &adev->pnp.ids, list)
1087                 if (!strcmp("PNP0C0A", hwid->id))
1088                         return true;
1089
1090         return false;
1091 }
1092
1093 static bool is_ejectable_bay(struct acpi_device *adev)
1094 {
1095         acpi_handle handle = adev->handle;
1096
1097         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1098                 return true;
1099
1100         return acpi_bay_match(handle);
1101 }
1102
1103 /*
1104  * acpi_dock_match - see if an acpi object has a _DCK method
1105  */
1106 bool acpi_dock_match(acpi_handle handle)
1107 {
1108         return acpi_has_method(handle, "_DCK");
1109 }
1110
1111 static acpi_status
1112 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1113                           void **return_value)
1114 {
1115         long *cap = context;
1116
1117         if (acpi_has_method(handle, "_BCM") &&
1118             acpi_has_method(handle, "_BCL")) {
1119                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1120                                   "support\n"));
1121                 *cap |= ACPI_VIDEO_BACKLIGHT;
1122                 /* We have backlight support, no need to scan further */
1123                 return AE_CTRL_TERMINATE;
1124         }
1125         return 0;
1126 }
1127
1128 /* Returns true if the ACPI object is a video device which can be
1129  * handled by video.ko.
1130  * The device will get a Linux specific CID added in scan.c to
1131  * identify the device as an ACPI graphics device
1132  * Be aware that the graphics device may not be physically present
1133  * Use acpi_video_get_capabilities() to detect general ACPI video
1134  * capabilities of present cards
1135  */
1136 long acpi_is_video_device(acpi_handle handle)
1137 {
1138         long video_caps = 0;
1139
1140         /* Is this device able to support video switching ? */
1141         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1142                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1143
1144         /* Is this device able to retrieve a video ROM ? */
1145         if (acpi_has_method(handle, "_ROM"))
1146                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1147
1148         /* Is this device able to configure which video head to be POSTed ? */
1149         if (acpi_has_method(handle, "_VPO") &&
1150             acpi_has_method(handle, "_GPD") &&
1151             acpi_has_method(handle, "_SPD"))
1152                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1153
1154         /* Only check for backlight functionality if one of the above hit. */
1155         if (video_caps)
1156                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1157                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1158                                     &video_caps, NULL);
1159
1160         return video_caps;
1161 }
1162 EXPORT_SYMBOL(acpi_is_video_device);
1163
1164 const char *acpi_device_hid(struct acpi_device *device)
1165 {
1166         struct acpi_hardware_id *hid;
1167
1168         if (list_empty(&device->pnp.ids))
1169                 return dummy_hid;
1170
1171         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1172         return hid->id;
1173 }
1174 EXPORT_SYMBOL(acpi_device_hid);
1175
1176 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1177 {
1178         struct acpi_hardware_id *id;
1179
1180         id = kmalloc(sizeof(*id), GFP_KERNEL);
1181         if (!id)
1182                 return;
1183
1184         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1185         if (!id->id) {
1186                 kfree(id);
1187                 return;
1188         }
1189
1190         list_add_tail(&id->list, &pnp->ids);
1191         pnp->type.hardware_id = 1;
1192 }
1193
1194 /*
1195  * Old IBM workstations have a DSDT bug wherein the SMBus object
1196  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1197  * prefix.  Work around this.
1198  */
1199 static bool acpi_ibm_smbus_match(acpi_handle handle)
1200 {
1201         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1202         struct acpi_buffer path = { sizeof(node_name), node_name };
1203
1204         if (!dmi_name_in_vendors("IBM"))
1205                 return false;
1206
1207         /* Look for SMBS object */
1208         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1209             strcmp("SMBS", path.pointer))
1210                 return false;
1211
1212         /* Does it have the necessary (but misnamed) methods? */
1213         if (acpi_has_method(handle, "SBI") &&
1214             acpi_has_method(handle, "SBR") &&
1215             acpi_has_method(handle, "SBW"))
1216                 return true;
1217
1218         return false;
1219 }
1220
1221 static bool acpi_object_is_system_bus(acpi_handle handle)
1222 {
1223         acpi_handle tmp;
1224
1225         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1226             tmp == handle)
1227                 return true;
1228         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1229             tmp == handle)
1230                 return true;
1231
1232         return false;
1233 }
1234
1235 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1236                                 int device_type)
1237 {
1238         acpi_status status;
1239         struct acpi_device_info *info;
1240         struct acpi_pnp_device_id_list *cid_list;
1241         int i;
1242
1243         switch (device_type) {
1244         case ACPI_BUS_TYPE_DEVICE:
1245                 if (handle == ACPI_ROOT_OBJECT) {
1246                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1247                         break;
1248                 }
1249
1250                 status = acpi_get_object_info(handle, &info);
1251                 if (ACPI_FAILURE(status)) {
1252                         pr_err(PREFIX "%s: Error reading device info\n",
1253                                         __func__);
1254                         return;
1255                 }
1256
1257                 if (info->valid & ACPI_VALID_HID) {
1258                         acpi_add_id(pnp, info->hardware_id.string);
1259                         pnp->type.platform_id = 1;
1260                 }
1261                 if (info->valid & ACPI_VALID_CID) {
1262                         cid_list = &info->compatible_id_list;
1263                         for (i = 0; i < cid_list->count; i++)
1264                                 acpi_add_id(pnp, cid_list->ids[i].string);
1265                 }
1266                 if (info->valid & ACPI_VALID_ADR) {
1267                         pnp->bus_address = info->address;
1268                         pnp->type.bus_address = 1;
1269                 }
1270                 if (info->valid & ACPI_VALID_UID)
1271                         pnp->unique_id = kstrdup(info->unique_id.string,
1272                                                         GFP_KERNEL);
1273                 if (info->valid & ACPI_VALID_CLS)
1274                         acpi_add_id(pnp, info->class_code.string);
1275
1276                 kfree(info);
1277
1278                 /*
1279                  * Some devices don't reliably have _HIDs & _CIDs, so add
1280                  * synthetic HIDs to make sure drivers can find them.
1281                  */
1282                 if (acpi_is_video_device(handle))
1283                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1284                 else if (acpi_bay_match(handle))
1285                         acpi_add_id(pnp, ACPI_BAY_HID);
1286                 else if (acpi_dock_match(handle))
1287                         acpi_add_id(pnp, ACPI_DOCK_HID);
1288                 else if (acpi_ibm_smbus_match(handle))
1289                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1290                 else if (list_empty(&pnp->ids) &&
1291                          acpi_object_is_system_bus(handle)) {
1292                         /* \_SB, \_TZ, LNXSYBUS */
1293                         acpi_add_id(pnp, ACPI_BUS_HID);
1294                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1295                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1296                 }
1297
1298                 break;
1299         case ACPI_BUS_TYPE_POWER:
1300                 acpi_add_id(pnp, ACPI_POWER_HID);
1301                 break;
1302         case ACPI_BUS_TYPE_PROCESSOR:
1303                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1304                 break;
1305         case ACPI_BUS_TYPE_THERMAL:
1306                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1307                 break;
1308         case ACPI_BUS_TYPE_POWER_BUTTON:
1309                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1310                 break;
1311         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1312                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1313                 break;
1314         }
1315 }
1316
1317 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1318 {
1319         struct acpi_hardware_id *id, *tmp;
1320
1321         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1322                 kfree_const(id->id);
1323                 kfree(id);
1324         }
1325         kfree(pnp->unique_id);
1326 }
1327
1328 /**
1329  * acpi_dma_supported - Check DMA support for the specified device.
1330  * @adev: The pointer to acpi device
1331  *
1332  * Return false if DMA is not supported. Otherwise, return true
1333  */
1334 bool acpi_dma_supported(struct acpi_device *adev)
1335 {
1336         if (!adev)
1337                 return false;
1338
1339         if (adev->flags.cca_seen)
1340                 return true;
1341
1342         /*
1343         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1344         * DMA on "Intel platforms".  Presumably that includes all x86 and
1345         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1346         */
1347         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1348                 return true;
1349
1350         return false;
1351 }
1352
1353 /**
1354  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1355  * @adev: The pointer to acpi device
1356  *
1357  * Return enum dev_dma_attr.
1358  */
1359 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1360 {
1361         if (!acpi_dma_supported(adev))
1362                 return DEV_DMA_NOT_SUPPORTED;
1363
1364         if (adev->flags.coherent_dma)
1365                 return DEV_DMA_COHERENT;
1366         else
1367                 return DEV_DMA_NON_COHERENT;
1368 }
1369
1370 static void acpi_init_coherency(struct acpi_device *adev)
1371 {
1372         unsigned long long cca = 0;
1373         acpi_status status;
1374         struct acpi_device *parent = adev->parent;
1375
1376         if (parent && parent->flags.cca_seen) {
1377                 /*
1378                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1379                  * already saw one.
1380                  */
1381                 adev->flags.cca_seen = 1;
1382                 cca = parent->flags.coherent_dma;
1383         } else {
1384                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1385                                                NULL, &cca);
1386                 if (ACPI_SUCCESS(status))
1387                         adev->flags.cca_seen = 1;
1388                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1389                         /*
1390                          * If architecture does not specify that _CCA is
1391                          * required for DMA-able devices (e.g. x86),
1392                          * we default to _CCA=1.
1393                          */
1394                         cca = 1;
1395                 else
1396                         acpi_handle_debug(adev->handle,
1397                                           "ACPI device is missing _CCA.\n");
1398         }
1399
1400         adev->flags.coherent_dma = cca;
1401 }
1402
1403 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1404                              int type, unsigned long long sta)
1405 {
1406         INIT_LIST_HEAD(&device->pnp.ids);
1407         device->device_type = type;
1408         device->handle = handle;
1409         device->parent = acpi_bus_get_parent(handle);
1410         device->fwnode.type = FWNODE_ACPI;
1411         acpi_set_device_status(device, sta);
1412         acpi_device_get_busid(device);
1413         acpi_set_pnp_ids(handle, &device->pnp, type);
1414         acpi_init_properties(device);
1415         acpi_bus_get_flags(device);
1416         device->flags.match_driver = false;
1417         device->flags.initialized = true;
1418         acpi_device_clear_enumerated(device);
1419         device_initialize(&device->dev);
1420         dev_set_uevent_suppress(&device->dev, true);
1421         acpi_init_coherency(device);
1422 }
1423
1424 void acpi_device_add_finalize(struct acpi_device *device)
1425 {
1426         dev_set_uevent_suppress(&device->dev, false);
1427         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1428 }
1429
1430 static int acpi_add_single_object(struct acpi_device **child,
1431                                   acpi_handle handle, int type,
1432                                   unsigned long long sta)
1433 {
1434         int result;
1435         struct acpi_device *device;
1436         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1437
1438         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1439         if (!device) {
1440                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1441                 return -ENOMEM;
1442         }
1443
1444         acpi_init_device_object(device, handle, type, sta);
1445         acpi_bus_get_power_flags(device);
1446         acpi_bus_get_wakeup_device_flags(device);
1447
1448         result = acpi_device_add(device, acpi_device_release);
1449         if (result) {
1450                 acpi_device_release(&device->dev);
1451                 return result;
1452         }
1453
1454         acpi_power_add_remove_device(device, true);
1455         acpi_device_add_finalize(device);
1456         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1457         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1458                 dev_name(&device->dev), (char *) buffer.pointer,
1459                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1460         kfree(buffer.pointer);
1461         *child = device;
1462         return 0;
1463 }
1464
1465 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1466                                             void *context)
1467 {
1468         struct resource *res = context;
1469
1470         if (acpi_dev_resource_memory(ares, res))
1471                 return AE_CTRL_TERMINATE;
1472
1473         return AE_OK;
1474 }
1475
1476 static bool acpi_device_should_be_hidden(acpi_handle handle)
1477 {
1478         acpi_status status;
1479         struct resource res;
1480
1481         /* Check if it should ignore the UART device */
1482         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1483                 return false;
1484
1485         /*
1486          * The UART device described in SPCR table is assumed to have only one
1487          * memory resource present. So we only look for the first one here.
1488          */
1489         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1490                                      acpi_get_resource_memory, &res);
1491         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1492                 return false;
1493
1494         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1495                          &res.start);
1496
1497         return true;
1498 }
1499
1500 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1501                                     unsigned long long *sta)
1502 {
1503         acpi_status status;
1504         acpi_object_type acpi_type;
1505
1506         status = acpi_get_type(handle, &acpi_type);
1507         if (ACPI_FAILURE(status))
1508                 return -ENODEV;
1509
1510         switch (acpi_type) {
1511         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1512         case ACPI_TYPE_DEVICE:
1513                 if (acpi_device_should_be_hidden(handle))
1514                         return -ENODEV;
1515
1516                 *type = ACPI_BUS_TYPE_DEVICE;
1517                 status = acpi_bus_get_status_handle(handle, sta);
1518                 if (ACPI_FAILURE(status))
1519                         *sta = 0;
1520                 break;
1521         case ACPI_TYPE_PROCESSOR:
1522                 *type = ACPI_BUS_TYPE_PROCESSOR;
1523                 status = acpi_bus_get_status_handle(handle, sta);
1524                 if (ACPI_FAILURE(status))
1525                         return -ENODEV;
1526                 break;
1527         case ACPI_TYPE_THERMAL:
1528                 *type = ACPI_BUS_TYPE_THERMAL;
1529                 *sta = ACPI_STA_DEFAULT;
1530                 break;
1531         case ACPI_TYPE_POWER:
1532                 *type = ACPI_BUS_TYPE_POWER;
1533                 *sta = ACPI_STA_DEFAULT;
1534                 break;
1535         default:
1536                 return -ENODEV;
1537         }
1538
1539         return 0;
1540 }
1541
1542 bool acpi_device_is_present(struct acpi_device *adev)
1543 {
1544         if (adev->status.present || adev->status.functional)
1545                 return true;
1546
1547         adev->flags.initialized = false;
1548         return false;
1549 }
1550
1551 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1552                                        const char *idstr,
1553                                        const struct acpi_device_id **matchid)
1554 {
1555         const struct acpi_device_id *devid;
1556
1557         if (handler->match)
1558                 return handler->match(idstr, matchid);
1559
1560         for (devid = handler->ids; devid->id[0]; devid++)
1561                 if (!strcmp((char *)devid->id, idstr)) {
1562                         if (matchid)
1563                                 *matchid = devid;
1564
1565                         return true;
1566                 }
1567
1568         return false;
1569 }
1570
1571 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1572                                         const struct acpi_device_id **matchid)
1573 {
1574         struct acpi_scan_handler *handler;
1575
1576         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1577                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1578                         return handler;
1579
1580         return NULL;
1581 }
1582
1583 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1584 {
1585         if (!!hotplug->enabled == !!val)
1586                 return;
1587
1588         mutex_lock(&acpi_scan_lock);
1589
1590         hotplug->enabled = val;
1591
1592         mutex_unlock(&acpi_scan_lock);
1593 }
1594
1595 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1596 {
1597         struct acpi_hardware_id *hwid;
1598
1599         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1600                 acpi_dock_add(adev);
1601                 return;
1602         }
1603         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1604                 struct acpi_scan_handler *handler;
1605
1606                 handler = acpi_scan_match_handler(hwid->id, NULL);
1607                 if (handler) {
1608                         adev->flags.hotplug_notify = true;
1609                         break;
1610                 }
1611         }
1612 }
1613
1614 static void acpi_device_dep_initialize(struct acpi_device *adev)
1615 {
1616         struct acpi_dep_data *dep;
1617         struct acpi_handle_list dep_devices;
1618         acpi_status status;
1619         int i;
1620
1621         if (!acpi_has_method(adev->handle, "_DEP"))
1622                 return;
1623
1624         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1625                                         &dep_devices);
1626         if (ACPI_FAILURE(status)) {
1627                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1628                 return;
1629         }
1630
1631         for (i = 0; i < dep_devices.count; i++) {
1632                 struct acpi_device_info *info;
1633                 int skip;
1634
1635                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1636                 if (ACPI_FAILURE(status)) {
1637                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1638                         continue;
1639                 }
1640
1641                 /*
1642                  * Skip the dependency of Windows System Power
1643                  * Management Controller
1644                  */
1645                 skip = info->valid & ACPI_VALID_HID &&
1646                         !strcmp(info->hardware_id.string, "INT3396");
1647
1648                 kfree(info);
1649
1650                 if (skip)
1651                         continue;
1652
1653                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1654                 if (!dep)
1655                         return;
1656
1657                 dep->master = dep_devices.handles[i];
1658                 dep->slave  = adev->handle;
1659                 adev->dep_unmet++;
1660
1661                 mutex_lock(&acpi_dep_list_lock);
1662                 list_add_tail(&dep->node , &acpi_dep_list);
1663                 mutex_unlock(&acpi_dep_list_lock);
1664         }
1665 }
1666
1667 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1668                                       void *not_used, void **return_value)
1669 {
1670         struct acpi_device *device = NULL;
1671         int type;
1672         unsigned long long sta;
1673         int result;
1674
1675         acpi_bus_get_device(handle, &device);
1676         if (device)
1677                 goto out;
1678
1679         result = acpi_bus_type_and_status(handle, &type, &sta);
1680         if (result)
1681                 return AE_OK;
1682
1683         if (type == ACPI_BUS_TYPE_POWER) {
1684                 acpi_add_power_resource(handle);
1685                 return AE_OK;
1686         }
1687
1688         acpi_add_single_object(&device, handle, type, sta);
1689         if (!device)
1690                 return AE_CTRL_DEPTH;
1691
1692         acpi_scan_init_hotplug(device);
1693         acpi_device_dep_initialize(device);
1694
1695  out:
1696         if (!*return_value)
1697                 *return_value = device;
1698
1699         return AE_OK;
1700 }
1701
1702 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
1703 {
1704         bool *is_spi_i2c_slave_p = data;
1705
1706         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1707                 return 1;
1708
1709         /*
1710          * devices that are connected to UART still need to be enumerated to
1711          * platform bus
1712          */
1713         if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
1714                 *is_spi_i2c_slave_p = true;
1715
1716          /* no need to do more checking */
1717         return -1;
1718 }
1719
1720 static void acpi_default_enumeration(struct acpi_device *device)
1721 {
1722         struct list_head resource_list;
1723         bool is_spi_i2c_slave = false;
1724
1725         /*
1726          * Do not enumerate SPI/I2C slaves as they will be enumerated by their
1727          * respective parents.
1728          */
1729         INIT_LIST_HEAD(&resource_list);
1730         acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
1731                                &is_spi_i2c_slave);
1732         acpi_dev_free_resource_list(&resource_list);
1733         if (!is_spi_i2c_slave) {
1734                 acpi_create_platform_device(device, NULL);
1735                 acpi_device_set_enumerated(device);
1736         } else {
1737                 blocking_notifier_call_chain(&acpi_reconfig_chain,
1738                                              ACPI_RECONFIG_DEVICE_ADD, device);
1739         }
1740 }
1741
1742 static const struct acpi_device_id generic_device_ids[] = {
1743         {ACPI_DT_NAMESPACE_HID, },
1744         {"", },
1745 };
1746
1747 static int acpi_generic_device_attach(struct acpi_device *adev,
1748                                       const struct acpi_device_id *not_used)
1749 {
1750         /*
1751          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1752          * below can be unconditional.
1753          */
1754         if (adev->data.of_compatible)
1755                 acpi_default_enumeration(adev);
1756
1757         return 1;
1758 }
1759
1760 static struct acpi_scan_handler generic_device_handler = {
1761         .ids = generic_device_ids,
1762         .attach = acpi_generic_device_attach,
1763 };
1764
1765 static int acpi_scan_attach_handler(struct acpi_device *device)
1766 {
1767         struct acpi_hardware_id *hwid;
1768         int ret = 0;
1769
1770         list_for_each_entry(hwid, &device->pnp.ids, list) {
1771                 const struct acpi_device_id *devid;
1772                 struct acpi_scan_handler *handler;
1773
1774                 handler = acpi_scan_match_handler(hwid->id, &devid);
1775                 if (handler) {
1776                         if (!handler->attach) {
1777                                 device->pnp.type.platform_id = 0;
1778                                 continue;
1779                         }
1780                         device->handler = handler;
1781                         ret = handler->attach(device, devid);
1782                         if (ret > 0)
1783                                 break;
1784
1785                         device->handler = NULL;
1786                         if (ret < 0)
1787                                 break;
1788                 }
1789         }
1790
1791         return ret;
1792 }
1793
1794 static void acpi_bus_attach(struct acpi_device *device)
1795 {
1796         struct acpi_device *child;
1797         acpi_handle ejd;
1798         int ret;
1799
1800         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1801                 register_dock_dependent_device(device, ejd);
1802
1803         acpi_bus_get_status(device);
1804         /* Skip devices that are not present. */
1805         if (!acpi_device_is_present(device)) {
1806                 acpi_device_clear_enumerated(device);
1807                 device->flags.power_manageable = 0;
1808                 return;
1809         }
1810         if (device->handler)
1811                 goto ok;
1812
1813         if (!device->flags.initialized) {
1814                 device->flags.power_manageable =
1815                         device->power.states[ACPI_STATE_D0].flags.valid;
1816                 if (acpi_bus_init_power(device))
1817                         device->flags.power_manageable = 0;
1818
1819                 device->flags.initialized = true;
1820         }
1821
1822         ret = acpi_scan_attach_handler(device);
1823         if (ret < 0)
1824                 return;
1825
1826         device->flags.match_driver = true;
1827         if (!ret) {
1828                 ret = device_attach(&device->dev);
1829                 if (ret < 0)
1830                         return;
1831
1832                 if (!ret && device->pnp.type.platform_id)
1833                         acpi_default_enumeration(device);
1834         }
1835
1836  ok:
1837         list_for_each_entry(child, &device->children, node)
1838                 acpi_bus_attach(child);
1839
1840         if (device->handler && device->handler->hotplug.notify_online)
1841                 device->handler->hotplug.notify_online(device);
1842 }
1843
1844 void acpi_walk_dep_device_list(acpi_handle handle)
1845 {
1846         struct acpi_dep_data *dep, *tmp;
1847         struct acpi_device *adev;
1848
1849         mutex_lock(&acpi_dep_list_lock);
1850         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
1851                 if (dep->master == handle) {
1852                         acpi_bus_get_device(dep->slave, &adev);
1853                         if (!adev)
1854                                 continue;
1855
1856                         adev->dep_unmet--;
1857                         if (!adev->dep_unmet)
1858                                 acpi_bus_attach(adev);
1859                         list_del(&dep->node);
1860                         kfree(dep);
1861                 }
1862         }
1863         mutex_unlock(&acpi_dep_list_lock);
1864 }
1865 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
1866
1867 /**
1868  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1869  * @handle: Root of the namespace scope to scan.
1870  *
1871  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1872  * found devices.
1873  *
1874  * If no devices were found, -ENODEV is returned, but it does not mean that
1875  * there has been a real error.  There just have been no suitable ACPI objects
1876  * in the table trunk from which the kernel could create a device and add an
1877  * appropriate driver.
1878  *
1879  * Must be called under acpi_scan_lock.
1880  */
1881 int acpi_bus_scan(acpi_handle handle)
1882 {
1883         void *device = NULL;
1884
1885         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1886                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1887                                     acpi_bus_check_add, NULL, NULL, &device);
1888
1889         if (device) {
1890                 acpi_bus_attach(device);
1891                 return 0;
1892         }
1893         return -ENODEV;
1894 }
1895 EXPORT_SYMBOL(acpi_bus_scan);
1896
1897 /**
1898  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
1899  * @adev: Root of the ACPI namespace scope to walk.
1900  *
1901  * Must be called under acpi_scan_lock.
1902  */
1903 void acpi_bus_trim(struct acpi_device *adev)
1904 {
1905         struct acpi_scan_handler *handler = adev->handler;
1906         struct acpi_device *child;
1907
1908         list_for_each_entry_reverse(child, &adev->children, node)
1909                 acpi_bus_trim(child);
1910
1911         adev->flags.match_driver = false;
1912         if (handler) {
1913                 if (handler->detach)
1914                         handler->detach(adev);
1915
1916                 adev->handler = NULL;
1917         } else {
1918                 device_release_driver(&adev->dev);
1919         }
1920         /*
1921          * Most likely, the device is going away, so put it into D3cold before
1922          * that.
1923          */
1924         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
1925         adev->flags.initialized = false;
1926         acpi_device_clear_enumerated(adev);
1927 }
1928 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1929
1930 static int acpi_bus_scan_fixed(void)
1931 {
1932         int result = 0;
1933
1934         /*
1935          * Enumerate all fixed-feature devices.
1936          */
1937         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1938                 struct acpi_device *device = NULL;
1939
1940                 result = acpi_add_single_object(&device, NULL,
1941                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1942                                                 ACPI_STA_DEFAULT);
1943                 if (result)
1944                         return result;
1945
1946                 device->flags.match_driver = true;
1947                 result = device_attach(&device->dev);
1948                 if (result < 0)
1949                         return result;
1950
1951                 device_init_wakeup(&device->dev, true);
1952         }
1953
1954         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1955                 struct acpi_device *device = NULL;
1956
1957                 result = acpi_add_single_object(&device, NULL,
1958                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1959                                                 ACPI_STA_DEFAULT);
1960                 if (result)
1961                         return result;
1962
1963                 device->flags.match_driver = true;
1964                 result = device_attach(&device->dev);
1965         }
1966
1967         return result < 0 ? result : 0;
1968 }
1969
1970 static void __init acpi_get_spcr_uart_addr(void)
1971 {
1972         acpi_status status;
1973         struct acpi_table_spcr *spcr_ptr;
1974
1975         status = acpi_get_table(ACPI_SIG_SPCR, 0,
1976                                 (struct acpi_table_header **)&spcr_ptr);
1977         if (ACPI_SUCCESS(status))
1978                 spcr_uart_addr = spcr_ptr->serial_port.address;
1979         else
1980                 printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
1981 }
1982
1983 static bool acpi_scan_initialized;
1984
1985 int __init acpi_scan_init(void)
1986 {
1987         int result;
1988         acpi_status status;
1989         struct acpi_table_stao *stao_ptr;
1990
1991         acpi_pci_root_init();
1992         acpi_pci_link_init();
1993         acpi_processor_init();
1994         acpi_lpss_init();
1995         acpi_apd_init();
1996         acpi_cmos_rtc_init();
1997         acpi_container_init();
1998         acpi_memory_hotplug_init();
1999         acpi_pnp_init();
2000         acpi_int340x_thermal_init();
2001         acpi_amba_init();
2002         acpi_watchdog_init();
2003
2004         acpi_scan_add_handler(&generic_device_handler);
2005
2006         /*
2007          * If there is STAO table, check whether it needs to ignore the UART
2008          * device in SPCR table.
2009          */
2010         status = acpi_get_table(ACPI_SIG_STAO, 0,
2011                                 (struct acpi_table_header **)&stao_ptr);
2012         if (ACPI_SUCCESS(status)) {
2013                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2014                         printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
2015
2016                 if (stao_ptr->ignore_uart)
2017                         acpi_get_spcr_uart_addr();
2018         }
2019
2020         mutex_lock(&acpi_scan_lock);
2021         /*
2022          * Enumerate devices in the ACPI namespace.
2023          */
2024         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2025         if (result)
2026                 goto out;
2027
2028         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2029         if (result)
2030                 goto out;
2031
2032         /* Fixed feature devices do not exist on HW-reduced platform */
2033         if (!acpi_gbl_reduced_hardware) {
2034                 result = acpi_bus_scan_fixed();
2035                 if (result) {
2036                         acpi_detach_data(acpi_root->handle,
2037                                          acpi_scan_drop_device);
2038                         acpi_device_del(acpi_root);
2039                         put_device(&acpi_root->dev);
2040                         goto out;
2041                 }
2042         }
2043
2044         acpi_update_all_gpes();
2045         acpi_ec_ecdt_start();
2046
2047         acpi_scan_initialized = true;
2048
2049  out:
2050         mutex_unlock(&acpi_scan_lock);
2051         return result;
2052 }
2053
2054 static struct acpi_probe_entry *ape;
2055 static int acpi_probe_count;
2056 static DEFINE_MUTEX(acpi_probe_mutex);
2057
2058 static int __init acpi_match_madt(struct acpi_subtable_header *header,
2059                                   const unsigned long end)
2060 {
2061         if (!ape->subtable_valid || ape->subtable_valid(header, ape))
2062                 if (!ape->probe_subtbl(header, end))
2063                         acpi_probe_count++;
2064
2065         return 0;
2066 }
2067
2068 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2069 {
2070         int count = 0;
2071
2072         if (acpi_disabled)
2073                 return 0;
2074
2075         mutex_lock(&acpi_probe_mutex);
2076         for (ape = ap_head; nr; ape++, nr--) {
2077                 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
2078                         acpi_probe_count = 0;
2079                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2080                         count += acpi_probe_count;
2081                 } else {
2082                         int res;
2083                         res = acpi_table_parse(ape->id, ape->probe_table);
2084                         if (!res)
2085                                 count++;
2086                 }
2087         }
2088         mutex_unlock(&acpi_probe_mutex);
2089
2090         return count;
2091 }
2092
2093 struct acpi_table_events_work {
2094         struct work_struct work;
2095         void *table;
2096         u32 event;
2097 };
2098
2099 static void acpi_table_events_fn(struct work_struct *work)
2100 {
2101         struct acpi_table_events_work *tew;
2102
2103         tew = container_of(work, struct acpi_table_events_work, work);
2104
2105         if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2106                 acpi_scan_lock_acquire();
2107                 acpi_bus_scan(ACPI_ROOT_OBJECT);
2108                 acpi_scan_lock_release();
2109         }
2110
2111         kfree(tew);
2112 }
2113
2114 void acpi_scan_table_handler(u32 event, void *table, void *context)
2115 {
2116         struct acpi_table_events_work *tew;
2117
2118         if (!acpi_scan_initialized)
2119                 return;
2120
2121         if (event != ACPI_TABLE_EVENT_LOAD)
2122                 return;
2123
2124         tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2125         if (!tew)
2126                 return;
2127
2128         INIT_WORK(&tew->work, acpi_table_events_fn);
2129         tew->table = table;
2130         tew->event = event;
2131
2132         schedule_work(&tew->work);
2133 }
2134
2135 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2136 {
2137         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2138 }
2139 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2140
2141 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2142 {
2143         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2144 }
2145 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);