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/acpi_iort.h>
  11 #include <linux/signal.h>
  12 #include <linux/kthread.h>
  13 #include <linux/dmi.h>
  14 #include <linux/nls.h>
  15 #include <linux/dma-mapping.h>
  16
  17 #include <asm/pgtable.h>
  18
  19 #include "internal.h"
  20
  21 #define _COMPONENT              ACPI_BUS_COMPONENT
  22 ACPI_MODULE_NAME("scan");
  23 extern struct acpi_device *acpi_root;
  24
  25 #define ACPI_BUS_CLASS                  "system_bus"
  26 #define ACPI_BUS_HID                    "LNXSYBUS"
  27 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  28
  29 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  30
  31 #define INVALID_ACPI_HANDLE     ((acpi_handle)empty_zero_page)
  32
  33 static const char *dummy_hid = "device";
  34
  35 static LIST_HEAD(acpi_dep_list);
  36 static DEFINE_MUTEX(acpi_dep_list_lock);
  37 LIST_HEAD(acpi_bus_id_list);
  38 static DEFINE_MUTEX(acpi_scan_lock);
  39 static LIST_HEAD(acpi_scan_handlers_list);
  40 DEFINE_MUTEX(acpi_device_lock);
  41 LIST_HEAD(acpi_wakeup_device_list);
  42 static DEFINE_MUTEX(acpi_hp_context_lock);
  43
  44 /*
  45  * The UART device described by the SPCR table is the only object which needs
  46  * special-casing. Everything else is covered by ACPI namespace paths in STAO
  47  * table.
  48  */
  49 static u64 spcr_uart_addr;
  50
  51 struct acpi_dep_data {
  52         struct list_head node;
  53         acpi_handle master;
  54         acpi_handle slave;
  55 };
  56
  57 void acpi_scan_lock_acquire(void)
  58 {
  59         mutex_lock(&acpi_scan_lock);
  60 }
  61 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  62
  63 void acpi_scan_lock_release(void)
  64 {
  65         mutex_unlock(&acpi_scan_lock);
  66 }
  67 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  68
  69 void acpi_lock_hp_context(void)
  70 {
  71         mutex_lock(&acpi_hp_context_lock);
  72 }
  73
  74 void acpi_unlock_hp_context(void)
  75 {
  76         mutex_unlock(&acpi_hp_context_lock);
  77 }
  78
  79 void acpi_initialize_hp_context(struct acpi_device *adev,
  80                                 struct acpi_hotplug_context *hp,
  81                                 int (*notify)(struct acpi_device *, u32),
  82                                 void (*uevent)(struct acpi_device *, u32))
  83 {
  84         acpi_lock_hp_context();
  85         hp->notify = notify;
  86         hp->uevent = uevent;
  87         acpi_set_hp_context(adev, hp);
  88         acpi_unlock_hp_context();
  89 }
  90 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
  91
  92 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  93 {
  94         if (!handler)
  95                 return -EINVAL;
  96
  97         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  98         return 0;
  99 }
 100
 101 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
 102                                        const char *hotplug_profile_name)
 103 {
 104         int error;
 105
 106         error = acpi_scan_add_handler(handler);
 107         if (error)
 108                 return error;
 109
 110         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
 111         return 0;
 112 }
 113
 114 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 115 {
 116         struct acpi_device_physical_node *pn;
 117         bool offline = true;
 118
 119         /*
 120          * acpi_container_offline() calls this for all of the container's
 121          * children under the container's physical_node_lock lock.
 122          */
 123         mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
 124
 125         list_for_each_entry(pn, &adev->physical_node_list, node)
 126                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
 127                         if (uevent)
 128                                 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
 129
 130                         offline = false;
 131                         break;
 132                 }
 133
 134         mutex_unlock(&adev->physical_node_lock);
 135         return offline;
 136 }
 137
 138 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 139                                     void **ret_p)
 140 {
 141         struct acpi_device *device = NULL;
 142         struct acpi_device_physical_node *pn;
 143         bool second_pass = (bool)data;
 144         acpi_status status = AE_OK;
 145
 146         if (acpi_bus_get_device(handle, &device))
 147                 return AE_OK;
 148
 149         if (device->handler && !device->handler->hotplug.enabled) {
 150                 *ret_p = &device->dev;
 151                 return AE_SUPPORT;
 152         }
 153
 154         mutex_lock(&device->physical_node_lock);
 155
 156         list_for_each_entry(pn, &device->physical_node_list, node) {
 157                 int ret;
 158
 159                 if (second_pass) {
 160                         /* Skip devices offlined by the first pass. */
 161                         if (pn->put_online)
 162                                 continue;
 163                 } else {
 164                         pn->put_online = false;
 165                 }
 166                 ret = device_offline(pn->dev);
 167                 if (ret >= 0) {
 168                         pn->put_online = !ret;
 169                 } else {
 170                         *ret_p = pn->dev;
 171                         if (second_pass) {
 172                                 status = AE_ERROR;
 173                                 break;
 174                         }
 175                 }
 176         }
 177
 178         mutex_unlock(&device->physical_node_lock);
 179
 180         return status;
 181 }
 182
 183 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 184                                    void **ret_p)
 185 {
 186         struct acpi_device *device = NULL;
 187         struct acpi_device_physical_node *pn;
 188
 189         if (acpi_bus_get_device(handle, &device))
 190                 return AE_OK;
 191
 192         mutex_lock(&device->physical_node_lock);
 193
 194         list_for_each_entry(pn, &device->physical_node_list, node)
 195                 if (pn->put_online) {
 196                         device_online(pn->dev);
 197                         pn->put_online = false;
 198                 }
 199
 200         mutex_unlock(&device->physical_node_lock);
 201
 202         return AE_OK;
 203 }
 204
 205 static int acpi_scan_try_to_offline(struct acpi_device *device)
 206 {
 207         acpi_handle handle = device->handle;
 208         struct device *errdev = NULL;
 209         acpi_status status;
 210
 211         /*
 212          * Carry out two passes here and ignore errors in the first pass,
 213          * because if the devices in question are memory blocks and
 214          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 215          * that the other blocks depend on, but it is not known in advance which
 216          * block holds them.
 217          *
 218          * If the first pass is successful, the second one isn't needed, though.
 219          */
 220         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 221                                      NULL, acpi_bus_offline, (void *)false,
 222                                      (void **)&errdev);
 223         if (status == AE_SUPPORT) {
 224                 dev_warn(errdev, "Offline disabled.\n");
 225                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 226                                     acpi_bus_online, NULL, NULL, NULL);
 227                 return -EPERM;
 228         }
 229         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
 230         if (errdev) {
 231                 errdev = NULL;
 232                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 233                                     NULL, acpi_bus_offline, (void *)true,
 234                                     (void **)&errdev);
 235                 if (!errdev)
 236                         acpi_bus_offline(handle, 0, (void *)true,
 237                                          (void **)&errdev);
 238
 239                 if (errdev) {
 240                         dev_warn(errdev, "Offline failed.\n");
 241                         acpi_bus_online(handle, 0, NULL, NULL);
 242                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 243                                             ACPI_UINT32_MAX, acpi_bus_online,
 244                                             NULL, NULL, NULL);
 245                         return -EBUSY;
 246                 }
 247         }
 248         return 0;
 249 }
 250
 251 static int acpi_scan_hot_remove(struct acpi_device *device)
 252 {
 253         acpi_handle handle = device->handle;
 254         unsigned long long sta;
 255         acpi_status status;
 256
 257         if (device->handler && device->handler->hotplug.demand_offline) {
 258                 if (!acpi_scan_is_offline(device, true))
 259                         return -EBUSY;
 260         } else {
 261                 int error = acpi_scan_try_to_offline(device);
 262                 if (error)
 263                         return error;
 264         }
 265
 266         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 267                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 268
 269         acpi_bus_trim(device);
 270
 271         acpi_evaluate_lck(handle, 0);
 272         /*
 273          * TBD: _EJD support.
 274          */
 275         status = acpi_evaluate_ej0(handle);
 276         if (status == AE_NOT_FOUND)
 277                 return -ENODEV;
 278         else if (ACPI_FAILURE(status))
 279                 return -EIO;
 280
 281         /*
 282          * Verify if eject was indeed successful.  If not, log an error
 283          * message.  No need to call _OST since _EJ0 call was made OK.
 284          */
 285         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 286         if (ACPI_FAILURE(status)) {
 287                 acpi_handle_warn(handle,
 288                         "Status check after eject failed (0x%x)\n", status);
 289         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 290                 acpi_handle_warn(handle,
 291                         "Eject incomplete - status 0x%llx\n", sta);
 292         }
 293
 294         return 0;
 295 }
 296
 297 static int acpi_scan_device_not_present(struct acpi_device *adev)
 298 {
 299         if (!acpi_device_enumerated(adev)) {
 300                 dev_warn(&adev->dev, "Still not present\n");
 301                 return -EALREADY;
 302         }
 303         acpi_bus_trim(adev);
 304         return 0;
 305 }
 306
 307 static int acpi_scan_device_check(struct acpi_device *adev)
 308 {
 309         int error;
 310
 311         acpi_bus_get_status(adev);
 312         if (adev->status.present || adev->status.functional) {
 313                 /*
 314                  * This function is only called for device objects for which
 315                  * matching scan handlers exist.  The only situation in which
 316                  * the scan handler is not attached to this device object yet
 317                  * is when the device has just appeared (either it wasn't
 318                  * present at all before or it was removed and then added
 319                  * again).
 320                  */
 321                 if (adev->handler) {
 322                         dev_warn(&adev->dev, "Already enumerated\n");
 323                         return -EALREADY;
 324                 }
 325                 error = acpi_bus_scan(adev->handle);
 326                 if (error) {
 327                         dev_warn(&adev->dev, "Namespace scan failure\n");
 328                         return error;
 329                 }
 330                 if (!adev->handler) {
 331                         dev_warn(&adev->dev, "Enumeration failure\n");
 332                         error = -ENODEV;
 333                 }
 334         } else {
 335                 error = acpi_scan_device_not_present(adev);
 336         }
 337         return error;
 338 }
 339
 340 static int acpi_scan_bus_check(struct acpi_device *adev)
 341 {
 342         struct acpi_scan_handler *handler = adev->handler;
 343         struct acpi_device *child;
 344         int error;
 345
 346         acpi_bus_get_status(adev);
 347         if (!(adev->status.present || adev->status.functional)) {
 348                 acpi_scan_device_not_present(adev);
 349                 return 0;
 350         }
 351         if (handler && handler->hotplug.scan_dependent)
 352                 return handler->hotplug.scan_dependent(adev);
 353
 354         error = acpi_bus_scan(adev->handle);
 355         if (error) {
 356                 dev_warn(&adev->dev, "Namespace scan failure\n");
 357                 return error;
 358         }
 359         list_for_each_entry(child, &adev->children, node) {
 360                 error = acpi_scan_bus_check(child);
 361                 if (error)
 362                         return error;
 363         }
 364         return 0;
 365 }
 366
 367 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 368 {
 369         switch (type) {
 370         case ACPI_NOTIFY_BUS_CHECK:
 371                 return acpi_scan_bus_check(adev);
 372         case ACPI_NOTIFY_DEVICE_CHECK:
 373                 return acpi_scan_device_check(adev);
 374         case ACPI_NOTIFY_EJECT_REQUEST:
 375         case ACPI_OST_EC_OSPM_EJECT:
 376                 if (adev->handler && !adev->handler->hotplug.enabled) {
 377                         dev_info(&adev->dev, "Eject disabled\n");
 378                         return -EPERM;
 379                 }
 380                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 381                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 382                 return acpi_scan_hot_remove(adev);
 383         }
 384         return -EINVAL;
 385 }
 386
 387 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 388 {
 389         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 390         int error = -ENODEV;
 391
 392         lock_device_hotplug();
 393         mutex_lock(&acpi_scan_lock);
 394
 395         /*
 396          * The device object's ACPI handle cannot become invalid as long as we
 397          * are holding acpi_scan_lock, but it might have become invalid before
 398          * that lock was acquired.
 399          */
 400         if (adev->handle == INVALID_ACPI_HANDLE)
 401                 goto err_out;
 402
 403         if (adev->flags.is_dock_station) {
 404                 error = dock_notify(adev, src);
 405         } else if (adev->flags.hotplug_notify) {
 406                 error = acpi_generic_hotplug_event(adev, src);
 407                 if (error == -EPERM) {
 408                         ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 409                         goto err_out;
 410                 }
 411         } else {
 412                 int (*notify)(struct acpi_device *, u32);
 413
 414                 acpi_lock_hp_context();
 415                 notify = adev->hp ? adev->hp->notify : NULL;
 416                 acpi_unlock_hp_context();
 417                 /*
 418                  * There may be additional notify handlers for device objects
 419                  * without the .event() callback, so ignore them here.
 420                  */
 421                 if (notify)
 422                         error = notify(adev, src);
 423                 else
 424                         goto out;
 425         }
 426         if (!error)
 427                 ost_code = ACPI_OST_SC_SUCCESS;
 428
 429  err_out:
 430         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 431
 432  out:
 433         acpi_bus_put_acpi_device(adev);
 434         mutex_unlock(&acpi_scan_lock);
 435         unlock_device_hotplug();
 436 }
 437
 438 static void acpi_free_power_resources_lists(struct acpi_device *device)
 439 {
 440         int i;
 441
 442         if (device->wakeup.flags.valid)
 443                 acpi_power_resources_list_free(&device->wakeup.resources);
 444
 445         if (!device->power.flags.power_resources)
 446                 return;
 447
 448         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 449                 struct acpi_device_power_state *ps = &device->power.states[i];
 450                 acpi_power_resources_list_free(&ps->resources);
 451         }
 452 }
 453
 454 static void acpi_device_release(struct device *dev)
 455 {
 456         struct acpi_device *acpi_dev = to_acpi_device(dev);
 457
 458         acpi_free_properties(acpi_dev);
 459         acpi_free_pnp_ids(&acpi_dev->pnp);
 460         acpi_free_power_resources_lists(acpi_dev);
 461         kfree(acpi_dev);
 462 }
 463
 464 static void acpi_device_del(struct acpi_device *device)
 465 {
 466         struct acpi_device_bus_id *acpi_device_bus_id;
 467
 468         mutex_lock(&acpi_device_lock);
 469         if (device->parent)
 470                 list_del(&device->node);
 471
 472         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
 473                 if (!strcmp(acpi_device_bus_id->bus_id,
 474                             acpi_device_hid(device))) {
 475                         if (acpi_device_bus_id->instance_no > 0)
 476                                 acpi_device_bus_id->instance_no--;
 477                         else {
 478                                 list_del(&acpi_device_bus_id->node);
 479                                 kfree(acpi_device_bus_id);
 480                         }
 481                         break;
 482                 }
 483
 484         list_del(&device->wakeup_list);
 485         mutex_unlock(&acpi_device_lock);
 486
 487         acpi_power_add_remove_device(device, false);
 488         acpi_device_remove_files(device);
 489         if (device->remove)
 490                 device->remove(device);
 491
 492         device_del(&device->dev);
 493 }
 494
 495 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
 496
 497 static LIST_HEAD(acpi_device_del_list);
 498 static DEFINE_MUTEX(acpi_device_del_lock);
 499
 500 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 501 {
 502         for (;;) {
 503                 struct acpi_device *adev;
 504
 505                 mutex_lock(&acpi_device_del_lock);
 506
 507                 if (list_empty(&acpi_device_del_list)) {
 508                         mutex_unlock(&acpi_device_del_lock);
 509                         break;
 510                 }
 511                 adev = list_first_entry(&acpi_device_del_list,
 512                                         struct acpi_device, del_list);
 513                 list_del(&adev->del_list);
 514
 515                 mutex_unlock(&acpi_device_del_lock);
 516
 517                 blocking_notifier_call_chain(&acpi_reconfig_chain,
 518                                              ACPI_RECONFIG_DEVICE_REMOVE, adev);
 519
 520                 acpi_device_del(adev);
 521                 /*
 522                  * Drop references to all power resources that might have been
 523                  * used by the device.
 524                  */
 525                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
 526                 put_device(&adev->dev);
 527         }
 528 }
 529
 530 /**
 531  * acpi_scan_drop_device - Drop an ACPI device object.
 532  * @handle: Handle of an ACPI namespace node, not used.
 533  * @context: Address of the ACPI device object to drop.
 534  *
 535  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
 536  * namespace node the device object pointed to by @context is attached to.
 537  *
 538  * The unregistration is carried out asynchronously to avoid running
 539  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
 540  * ensure the correct ordering (the device objects must be unregistered in the
 541  * same order in which the corresponding namespace nodes are deleted).
 542  */
 543 static void acpi_scan_drop_device(acpi_handle handle, void *context)
 544 {
 545         static DECLARE_WORK(work, acpi_device_del_work_fn);
 546         struct acpi_device *adev = context;
 547
 548         mutex_lock(&acpi_device_del_lock);
 549
 550         /*
 551          * Use the ACPI hotplug workqueue which is ordered, so this work item
 552          * won't run after any hotplug work items submitted subsequently.  That
 553          * prevents attempts to register device objects identical to those being
 554          * deleted from happening concurrently (such attempts result from
 555          * hotplug events handled via the ACPI hotplug workqueue).  It also will
 556          * run after all of the work items submitted previosuly, which helps
 557          * those work items to ensure that they are not accessing stale device
 558          * objects.
 559          */
 560         if (list_empty(&acpi_device_del_list))
 561                 acpi_queue_hotplug_work(&work);
 562
 563         list_add_tail(&adev->del_list, &acpi_device_del_list);
 564         /* Make acpi_ns_validate_handle() return NULL for this handle. */
 565         adev->handle = INVALID_ACPI_HANDLE;
 566
 567         mutex_unlock(&acpi_device_del_lock);
 568 }
 569
 570 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
 571                                 void (*callback)(void *))
 572 {
 573         acpi_status status;
 574
 575         if (!device)
 576                 return -EINVAL;
 577
 578         status = acpi_get_data_full(handle, acpi_scan_drop_device,
 579                                     (void **)device, callback);
 580         if (ACPI_FAILURE(status) || !*device) {
 581                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 582                                   handle));
 583                 return -ENODEV;
 584         }
 585         return 0;
 586 }
 587
 588 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 589 {
 590         return acpi_get_device_data(handle, device, NULL);
 591 }
 592 EXPORT_SYMBOL(acpi_bus_get_device);
 593
 594 static void get_acpi_device(void *dev)
 595 {
 596         if (dev)
 597                 get_device(&((struct acpi_device *)dev)->dev);
 598 }
 599
 600 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 601 {
 602         struct acpi_device *adev = NULL;
 603
 604         acpi_get_device_data(handle, &adev, get_acpi_device);
 605         return adev;
 606 }
 607
 608 void acpi_bus_put_acpi_device(struct acpi_device *adev)
 609 {
 610         put_device(&adev->dev);
 611 }
 612
 613 int acpi_device_add(struct acpi_device *device,
 614                     void (*release)(struct device *))
 615 {
 616         int result;
 617         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 618         int found = 0;
 619
 620         if (device->handle) {
 621                 acpi_status status;
 622
 623                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
 624                                           device);
 625                 if (ACPI_FAILURE(status)) {
 626                         acpi_handle_err(device->handle,
 627                                         "Unable to attach device data\n");
 628                         return -ENODEV;
 629                 }
 630         }
 631
 632         /*
 633          * Linkage
 634          * -------
 635          * Link this device to its parent and siblings.
 636          */
 637         INIT_LIST_HEAD(&device->children);
 638         INIT_LIST_HEAD(&device->node);
 639         INIT_LIST_HEAD(&device->wakeup_list);
 640         INIT_LIST_HEAD(&device->physical_node_list);
 641         INIT_LIST_HEAD(&device->del_list);
 642         mutex_init(&device->physical_node_lock);
 643
 644         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 645         if (!new_bus_id) {
 646                 pr_err(PREFIX "Memory allocation error\n");
 647                 result = -ENOMEM;
 648                 goto err_detach;
 649         }
 650
 651         mutex_lock(&acpi_device_lock);
 652         /*
 653          * Find suitable bus_id and instance number in acpi_bus_id_list
 654          * If failed, create one and link it into acpi_bus_id_list
 655          */
 656         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 657                 if (!strcmp(acpi_device_bus_id->bus_id,
 658                             acpi_device_hid(device))) {
 659                         acpi_device_bus_id->instance_no++;
 660                         found = 1;
 661                         kfree(new_bus_id);
 662                         break;
 663                 }
 664         }
 665         if (!found) {
 666                 acpi_device_bus_id = new_bus_id;
 667                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 668                 acpi_device_bus_id->instance_no = 0;
 669                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 670         }
 671         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 672
 673         if (device->parent)
 674                 list_add_tail(&device->node, &device->parent->children);
 675
 676         if (device->wakeup.flags.valid)
 677                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 678         mutex_unlock(&acpi_device_lock);
 679
 680         if (device->parent)
 681                 device->dev.parent = &device->parent->dev;
 682         device->dev.bus = &acpi_bus_type;
 683         device->dev.release = release;
 684         result = device_add(&device->dev);
 685         if (result) {
 686                 dev_err(&device->dev, "Error registering device\n");
 687                 goto err;
 688         }
 689
 690         result = acpi_device_setup_files(device);
 691         if (result)
 692                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 693                        dev_name(&device->dev));
 694
 695         return 0;
 696
 697  err:
 698         mutex_lock(&acpi_device_lock);
 699         if (device->parent)
 700                 list_del(&device->node);
 701         list_del(&device->wakeup_list);
 702         mutex_unlock(&acpi_device_lock);
 703
 704  err_detach:
 705         acpi_detach_data(device->handle, acpi_scan_drop_device);
 706         return result;
 707 }
 708
 709 /* --------------------------------------------------------------------------
 710                                  Device Enumeration
 711    -------------------------------------------------------------------------- */
 712 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 713 {
 714         struct acpi_device *device = NULL;
 715         acpi_status status;
 716
 717         /*
 718          * Fixed hardware devices do not appear in the namespace and do not
 719          * have handles, but we fabricate acpi_devices for them, so we have
 720          * to deal with them specially.
 721          */
 722         if (!handle)
 723                 return acpi_root;
 724
 725         do {
 726                 status = acpi_get_parent(handle, &handle);
 727                 if (ACPI_FAILURE(status))
 728                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 729         } while (acpi_bus_get_device(handle, &device));
 730         return device;
 731 }
 732
 733 acpi_status
 734 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 735 {
 736         acpi_status status;
 737         acpi_handle tmp;
 738         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 739         union acpi_object *obj;
 740
 741         status = acpi_get_handle(handle, "_EJD", &tmp);
 742         if (ACPI_FAILURE(status))
 743                 return status;
 744
 745         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 746         if (ACPI_SUCCESS(status)) {
 747                 obj = buffer.pointer;
 748                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 749                                          ejd);
 750                 kfree(buffer.pointer);
 751         }
 752         return status;
 753 }
 754 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 755
 756 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 757                                         struct acpi_device_wakeup *wakeup)
 758 {
 759         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 760         union acpi_object *package = NULL;
 761         union acpi_object *element = NULL;
 762         acpi_status status;
 763         int err = -ENODATA;
 764
 765         if (!wakeup)
 766                 return -EINVAL;
 767
 768         INIT_LIST_HEAD(&wakeup->resources);
 769
 770         /* _PRW */
 771         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 772         if (ACPI_FAILURE(status)) {
 773                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 774                 return err;
 775         }
 776
 777         package = (union acpi_object *)buffer.pointer;
 778
 779         if (!package || package->package.count < 2)
 780                 goto out;
 781
 782         element = &(package->package.elements[0]);
 783         if (!element)
 784                 goto out;
 785
 786         if (element->type == ACPI_TYPE_PACKAGE) {
 787                 if ((element->package.count < 2) ||
 788                     (element->package.elements[0].type !=
 789                      ACPI_TYPE_LOCAL_REFERENCE)
 790                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 791                         goto out;
 792
 793                 wakeup->gpe_device =
 794                     element->package.elements[0].reference.handle;
 795                 wakeup->gpe_number =
 796                     (u32) element->package.elements[1].integer.value;
 797         } else if (element->type == ACPI_TYPE_INTEGER) {
 798                 wakeup->gpe_device = NULL;
 799                 wakeup->gpe_number = element->integer.value;
 800         } else {
 801                 goto out;
 802         }
 803
 804         element = &(package->package.elements[1]);
 805         if (element->type != ACPI_TYPE_INTEGER)
 806                 goto out;
 807
 808         wakeup->sleep_state = element->integer.value;
 809
 810         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 811         if (err)
 812                 goto out;
 813
 814         if (!list_empty(&wakeup->resources)) {
 815                 int sleep_state;
 816
 817                 err = acpi_power_wakeup_list_init(&wakeup->resources,
 818                                                   &sleep_state);
 819                 if (err) {
 820                         acpi_handle_warn(handle, "Retrieving current states "
 821                                          "of wakeup power resources failed\n");
 822                         acpi_power_resources_list_free(&wakeup->resources);
 823                         goto out;
 824                 }
 825                 if (sleep_state < wakeup->sleep_state) {
 826                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
 827                                          "(S%d) by S%d from power resources\n",
 828                                          (int)wakeup->sleep_state, sleep_state);
 829                         wakeup->sleep_state = sleep_state;
 830                 }
 831         }
 832
 833  out:
 834         kfree(buffer.pointer);
 835         return err;
 836 }
 837
 838 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
 839 {
 840         static const struct acpi_device_id button_device_ids[] = {
 841                 {"PNP0C0C", 0},
 842                 {"PNP0C0D", 0},
 843                 {"PNP0C0E", 0},
 844                 {"", 0},
 845         };
 846         struct acpi_device_wakeup *wakeup = &device->wakeup;
 847         acpi_status status;
 848
 849         wakeup->flags.notifier_present = 0;
 850
 851         /* Power button, Lid switch always enable wakeup */
 852         if (!acpi_match_device_ids(device, button_device_ids)) {
 853                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 854                         /* Do not use Lid/sleep button for S5 wakeup */
 855                         if (wakeup->sleep_state == ACPI_STATE_S5)
 856                                 wakeup->sleep_state = ACPI_STATE_S4;
 857                 }
 858                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 859                 device_set_wakeup_capable(&device->dev, true);
 860                 return true;
 861         }
 862
 863         status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 864                                          wakeup->gpe_number);
 865         return ACPI_SUCCESS(status);
 866 }
 867
 868 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 869 {
 870         int err;
 871
 872         /* Presence of _PRW indicates wake capable */
 873         if (!acpi_has_method(device->handle, "_PRW"))
 874                 return;
 875
 876         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
 877                                                            &device->wakeup);
 878         if (err) {
 879                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
 880                 return;
 881         }
 882
 883         device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
 884         device->wakeup.prepare_count = 0;
 885         /*
 886          * Call _PSW/_DSW object to disable its ability to wake the sleeping
 887          * system for the ACPI device with the _PRW object.
 888          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 889          * So it is necessary to call _DSW object first. Only when it is not
 890          * present will the _PSW object used.
 891          */
 892         err = acpi_device_sleep_wake(device, 0, 0, 0);
 893         if (err)
 894                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 895                                 "error in _DSW or _PSW evaluation\n"));
 896 }
 897
 898 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 899 {
 900         struct acpi_device_power_state *ps = &device->power.states[state];
 901         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 902         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 903         acpi_status status;
 904
 905         INIT_LIST_HEAD(&ps->resources);
 906
 907         /* Evaluate "_PRx" to get referenced power resources */
 908         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 909         if (ACPI_SUCCESS(status)) {
 910                 union acpi_object *package = buffer.pointer;
 911
 912                 if (buffer.length && package
 913                     && package->type == ACPI_TYPE_PACKAGE
 914                     && package->package.count) {
 915                         int err = acpi_extract_power_resources(package, 0,
 916                                                                &ps->resources);
 917                         if (!err)
 918                                 device->power.flags.power_resources = 1;
 919                 }
 920                 ACPI_FREE(buffer.pointer);
 921         }
 922
 923         /* Evaluate "_PSx" to see if we can do explicit sets */
 924         pathname[2] = 'S';
 925         if (acpi_has_method(device->handle, pathname))
 926                 ps->flags.explicit_set = 1;
 927
 928         /* State is valid if there are means to put the device into it. */
 929         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
 930                 ps->flags.valid = 1;
 931
 932         ps->power = -1;         /* Unknown - driver assigned */
 933         ps->latency = -1;       /* Unknown - driver assigned */
 934 }
 935
 936 static void acpi_bus_get_power_flags(struct acpi_device *device)
 937 {
 938         u32 i;
 939
 940         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 941         if (!acpi_has_method(device->handle, "_PS0") &&
 942             !acpi_has_method(device->handle, "_PR0"))
 943                 return;
 944
 945         device->flags.power_manageable = 1;
 946
 947         /*
 948          * Power Management Flags
 949          */
 950         if (acpi_has_method(device->handle, "_PSC"))
 951                 device->power.flags.explicit_get = 1;
 952
 953         if (acpi_has_method(device->handle, "_IRC"))
 954                 device->power.flags.inrush_current = 1;
 955
 956         if (acpi_has_method(device->handle, "_DSW"))
 957                 device->power.flags.dsw_present = 1;
 958
 959         /*
 960          * Enumerate supported power management states
 961          */
 962         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
 963                 acpi_bus_init_power_state(device, i);
 964
 965         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
 966         if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
 967                 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
 968
 969         /* Set defaults for D0 and D3hot states (always valid) */
 970         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 971         device->power.states[ACPI_STATE_D0].power = 100;
 972         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
 973
 974         if (acpi_bus_init_power(device))
 975                 device->flags.power_manageable = 0;
 976 }
 977
 978 static void acpi_bus_get_flags(struct acpi_device *device)
 979 {
 980         /* Presence of _STA indicates 'dynamic_status' */
 981         if (acpi_has_method(device->handle, "_STA"))
 982                 device->flags.dynamic_status = 1;
 983
 984         /* Presence of _RMV indicates 'removable' */
 985         if (acpi_has_method(device->handle, "_RMV"))
 986                 device->flags.removable = 1;
 987
 988         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 989         if (acpi_has_method(device->handle, "_EJD") ||
 990             acpi_has_method(device->handle, "_EJ0"))
 991                 device->flags.ejectable = 1;
 992 }
 993
 994 static void acpi_device_get_busid(struct acpi_device *device)
 995 {
 996         char bus_id[5] = { '?', 0 };
 997         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 998         int i = 0;
 999
1000         /*
1001          * Bus ID
1002          * ------
1003          * The device's Bus ID is simply the object name.
1004          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1005          */
1006         if (ACPI_IS_ROOT_DEVICE(device)) {
1007                 strcpy(device->pnp.bus_id, "ACPI");
1008                 return;
1009         }
1010
1011         switch (device->device_type) {
1012         case ACPI_BUS_TYPE_POWER_BUTTON:
1013                 strcpy(device->pnp.bus_id, "PWRF");
1014                 break;
1015         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1016                 strcpy(device->pnp.bus_id, "SLPF");
1017                 break;
1018         default:
1019                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1020                 /* Clean up trailing underscores (if any) */
1021                 for (i = 3; i > 1; i--) {
1022                         if (bus_id[i] == '_')
1023                                 bus_id[i] = '\0';
1024                         else
1025                                 break;
1026                 }
1027                 strcpy(device->pnp.bus_id, bus_id);
1028                 break;
1029         }
1030 }
1031
1032 /*
1033  * acpi_ata_match - see if an acpi object is an ATA device
1034  *
1035  * If an acpi object has one of the ACPI ATA methods defined,
1036  * then we can safely call it an ATA device.
1037  */
1038 bool acpi_ata_match(acpi_handle handle)
1039 {
1040         return acpi_has_method(handle, "_GTF") ||
1041                acpi_has_method(handle, "_GTM") ||
1042                acpi_has_method(handle, "_STM") ||
1043                acpi_has_method(handle, "_SDD");
1044 }
1045
1046 /*
1047  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1048  *
1049  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1050  * then we can safely call it an ejectable drive bay
1051  */
1052 bool acpi_bay_match(acpi_handle handle)
1053 {
1054         acpi_handle phandle;
1055
1056         if (!acpi_has_method(handle, "_EJ0"))
1057                 return false;
1058         if (acpi_ata_match(handle))
1059                 return true;
1060         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1061                 return false;
1062
1063         return acpi_ata_match(phandle);
1064 }
1065
1066 bool acpi_device_is_battery(struct acpi_device *adev)
1067 {
1068         struct acpi_hardware_id *hwid;
1069
1070         list_for_each_entry(hwid, &adev->pnp.ids, list)
1071                 if (!strcmp("PNP0C0A", hwid->id))
1072                         return true;
1073
1074         return false;
1075 }
1076
1077 static bool is_ejectable_bay(struct acpi_device *adev)
1078 {
1079         acpi_handle handle = adev->handle;
1080
1081         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1082                 return true;
1083
1084         return acpi_bay_match(handle);
1085 }
1086
1087 /*
1088  * acpi_dock_match - see if an acpi object has a _DCK method
1089  */
1090 bool acpi_dock_match(acpi_handle handle)
1091 {
1092         return acpi_has_method(handle, "_DCK");
1093 }
1094
1095 static acpi_status
1096 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1097                           void **return_value)
1098 {
1099         long *cap = context;
1100
1101         if (acpi_has_method(handle, "_BCM") &&
1102             acpi_has_method(handle, "_BCL")) {
1103                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1104                                   "support\n"));
1105                 *cap |= ACPI_VIDEO_BACKLIGHT;
1106                 /* We have backlight support, no need to scan further */
1107                 return AE_CTRL_TERMINATE;
1108         }
1109         return 0;
1110 }
1111
1112 /* Returns true if the ACPI object is a video device which can be
1113  * handled by video.ko.
1114  * The device will get a Linux specific CID added in scan.c to
1115  * identify the device as an ACPI graphics device
1116  * Be aware that the graphics device may not be physically present
1117  * Use acpi_video_get_capabilities() to detect general ACPI video
1118  * capabilities of present cards
1119  */
1120 long acpi_is_video_device(acpi_handle handle)
1121 {
1122         long video_caps = 0;
1123
1124         /* Is this device able to support video switching ? */
1125         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1126                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1127
1128         /* Is this device able to retrieve a video ROM ? */
1129         if (acpi_has_method(handle, "_ROM"))
1130                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1131
1132         /* Is this device able to configure which video head to be POSTed ? */
1133         if (acpi_has_method(handle, "_VPO") &&
1134             acpi_has_method(handle, "_GPD") &&
1135             acpi_has_method(handle, "_SPD"))
1136                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1137
1138         /* Only check for backlight functionality if one of the above hit. */
1139         if (video_caps)
1140                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1141                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1142                                     &video_caps, NULL);
1143
1144         return video_caps;
1145 }
1146 EXPORT_SYMBOL(acpi_is_video_device);
1147
1148 const char *acpi_device_hid(struct acpi_device *device)
1149 {
1150         struct acpi_hardware_id *hid;
1151
1152         if (list_empty(&device->pnp.ids))
1153                 return dummy_hid;
1154
1155         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1156         return hid->id;
1157 }
1158 EXPORT_SYMBOL(acpi_device_hid);
1159
1160 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1161 {
1162         struct acpi_hardware_id *id;
1163
1164         id = kmalloc(sizeof(*id), GFP_KERNEL);
1165         if (!id)
1166                 return;
1167
1168         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1169         if (!id->id) {
1170                 kfree(id);
1171                 return;
1172         }
1173
1174         list_add_tail(&id->list, &pnp->ids);
1175         pnp->type.hardware_id = 1;
1176 }
1177
1178 /*
1179  * Old IBM workstations have a DSDT bug wherein the SMBus object
1180  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1181  * prefix.  Work around this.
1182  */
1183 static bool acpi_ibm_smbus_match(acpi_handle handle)
1184 {
1185         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1186         struct acpi_buffer path = { sizeof(node_name), node_name };
1187
1188         if (!dmi_name_in_vendors("IBM"))
1189                 return false;
1190
1191         /* Look for SMBS object */
1192         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1193             strcmp("SMBS", path.pointer))
1194                 return false;
1195
1196         /* Does it have the necessary (but misnamed) methods? */
1197         if (acpi_has_method(handle, "SBI") &&
1198             acpi_has_method(handle, "SBR") &&
1199             acpi_has_method(handle, "SBW"))
1200                 return true;
1201
1202         return false;
1203 }
1204
1205 static bool acpi_object_is_system_bus(acpi_handle handle)
1206 {
1207         acpi_handle tmp;
1208
1209         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1210             tmp == handle)
1211                 return true;
1212         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1213             tmp == handle)
1214                 return true;
1215
1216         return false;
1217 }
1218
1219 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1220                                 int device_type)
1221 {
1222         acpi_status status;
1223         struct acpi_device_info *info;
1224         struct acpi_pnp_device_id_list *cid_list;
1225         int i;
1226
1227         switch (device_type) {
1228         case ACPI_BUS_TYPE_DEVICE:
1229                 if (handle == ACPI_ROOT_OBJECT) {
1230                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1231                         break;
1232                 }
1233
1234                 status = acpi_get_object_info(handle, &info);
1235                 if (ACPI_FAILURE(status)) {
1236                         pr_err(PREFIX "%s: Error reading device info\n",
1237                                         __func__);
1238                         return;
1239                 }
1240
1241                 if (info->valid & ACPI_VALID_HID) {
1242                         acpi_add_id(pnp, info->hardware_id.string);
1243                         pnp->type.platform_id = 1;
1244                 }
1245                 if (info->valid & ACPI_VALID_CID) {
1246                         cid_list = &info->compatible_id_list;
1247                         for (i = 0; i < cid_list->count; i++)
1248                                 acpi_add_id(pnp, cid_list->ids[i].string);
1249                 }
1250                 if (info->valid & ACPI_VALID_ADR) {
1251                         pnp->bus_address = info->address;
1252                         pnp->type.bus_address = 1;
1253                 }
1254                 if (info->valid & ACPI_VALID_UID)
1255                         pnp->unique_id = kstrdup(info->unique_id.string,
1256                                                         GFP_KERNEL);
1257                 if (info->valid & ACPI_VALID_CLS)
1258                         acpi_add_id(pnp, info->class_code.string);
1259
1260                 kfree(info);
1261
1262                 /*
1263                  * Some devices don't reliably have _HIDs & _CIDs, so add
1264                  * synthetic HIDs to make sure drivers can find them.
1265                  */
1266                 if (acpi_is_video_device(handle))
1267                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1268                 else if (acpi_bay_match(handle))
1269                         acpi_add_id(pnp, ACPI_BAY_HID);
1270                 else if (acpi_dock_match(handle))
1271                         acpi_add_id(pnp, ACPI_DOCK_HID);
1272                 else if (acpi_ibm_smbus_match(handle))
1273                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1274                 else if (list_empty(&pnp->ids) &&
1275                          acpi_object_is_system_bus(handle)) {
1276                         /* \_SB, \_TZ, LNXSYBUS */
1277                         acpi_add_id(pnp, ACPI_BUS_HID);
1278                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1279                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1280                 }
1281
1282                 break;
1283         case ACPI_BUS_TYPE_POWER:
1284                 acpi_add_id(pnp, ACPI_POWER_HID);
1285                 break;
1286         case ACPI_BUS_TYPE_PROCESSOR:
1287                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1288                 break;
1289         case ACPI_BUS_TYPE_THERMAL:
1290                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1291                 break;
1292         case ACPI_BUS_TYPE_POWER_BUTTON:
1293                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1294                 break;
1295         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1296                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1297                 break;
1298         }
1299 }
1300
1301 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1302 {
1303         struct acpi_hardware_id *id, *tmp;
1304
1305         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1306                 kfree_const(id->id);
1307                 kfree(id);
1308         }
1309         kfree(pnp->unique_id);
1310 }
1311
1312 /**
1313  * acpi_dma_supported - Check DMA support for the specified device.
1314  * @adev: The pointer to acpi device
1315  *
1316  * Return false if DMA is not supported. Otherwise, return true
1317  */
1318 bool acpi_dma_supported(struct acpi_device *adev)
1319 {
1320         if (!adev)
1321                 return false;
1322
1323         if (adev->flags.cca_seen)
1324                 return true;
1325
1326         /*
1327         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1328         * DMA on "Intel platforms".  Presumably that includes all x86 and
1329         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1330         */
1331         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1332                 return true;
1333
1334         return false;
1335 }
1336
1337 /**
1338  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1339  * @adev: The pointer to acpi device
1340  *
1341  * Return enum dev_dma_attr.
1342  */
1343 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1344 {
1345         if (!acpi_dma_supported(adev))
1346                 return DEV_DMA_NOT_SUPPORTED;
1347
1348         if (adev->flags.coherent_dma)
1349                 return DEV_DMA_COHERENT;
1350         else
1351                 return DEV_DMA_NON_COHERENT;
1352 }
1353
1354 /**
1355  * acpi_dma_configure - Set-up DMA configuration for the device.
1356  * @dev: The pointer to the device
1357  * @attr: device dma attributes
1358  */
1359 int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
1360 {
1361         const struct iommu_ops *iommu;
1362         u64 size;
1363
1364         iort_set_dma_mask(dev);
1365
1366         iommu = iort_iommu_configure(dev);
1367         if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
1368                 return -EPROBE_DEFER;
1369
1370         size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
1371         /*
1372          * Assume dma valid range starts at 0 and covers the whole
1373          * coherent_dma_mask.
1374          */
1375         arch_setup_dma_ops(dev, 0, size, iommu, attr == DEV_DMA_COHERENT);
1376
1377         return 0;
1378 }
1379 EXPORT_SYMBOL_GPL(acpi_dma_configure);
1380
1381 /**
1382  * acpi_dma_deconfigure - Tear-down DMA configuration for the device.
1383  * @dev: The pointer to the device
1384  */
1385 void acpi_dma_deconfigure(struct device *dev)
1386 {
1387         arch_teardown_dma_ops(dev);
1388 }
1389 EXPORT_SYMBOL_GPL(acpi_dma_deconfigure);
1390
1391 static void acpi_init_coherency(struct acpi_device *adev)
1392 {
1393         unsigned long long cca = 0;
1394         acpi_status status;
1395         struct acpi_device *parent = adev->parent;
1396
1397         if (parent && parent->flags.cca_seen) {
1398                 /*
1399                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1400                  * already saw one.
1401                  */
1402                 adev->flags.cca_seen = 1;
1403                 cca = parent->flags.coherent_dma;
1404         } else {
1405                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1406                                                NULL, &cca);
1407                 if (ACPI_SUCCESS(status))
1408                         adev->flags.cca_seen = 1;
1409                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1410                         /*
1411                          * If architecture does not specify that _CCA is
1412                          * required for DMA-able devices (e.g. x86),
1413                          * we default to _CCA=1.
1414                          */
1415                         cca = 1;
1416                 else
1417                         acpi_handle_debug(adev->handle,
1418                                           "ACPI device is missing _CCA.\n");
1419         }
1420
1421         adev->flags.coherent_dma = cca;
1422 }
1423
1424 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
1425 {
1426         bool *is_spi_i2c_slave_p = data;
1427
1428         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1429                 return 1;
1430
1431         /*
1432          * devices that are connected to UART still need to be enumerated to
1433          * platform bus
1434          */
1435         if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
1436                 *is_spi_i2c_slave_p = true;
1437
1438          /* no need to do more checking */
1439         return -1;
1440 }
1441
1442 static bool acpi_is_spi_i2c_slave(struct acpi_device *device)
1443 {
1444         struct list_head resource_list;
1445         bool is_spi_i2c_slave = false;
1446
1447         INIT_LIST_HEAD(&resource_list);
1448         acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
1449                                &is_spi_i2c_slave);
1450         acpi_dev_free_resource_list(&resource_list);
1451
1452         return is_spi_i2c_slave;
1453 }
1454
1455 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1456                              int type, unsigned long long sta)
1457 {
1458         INIT_LIST_HEAD(&device->pnp.ids);
1459         device->device_type = type;
1460         device->handle = handle;
1461         device->parent = acpi_bus_get_parent(handle);
1462         device->fwnode.type = FWNODE_ACPI;
1463         acpi_set_device_status(device, sta);
1464         acpi_device_get_busid(device);
1465         acpi_set_pnp_ids(handle, &device->pnp, type);
1466         acpi_init_properties(device);
1467         acpi_bus_get_flags(device);
1468         device->flags.match_driver = false;
1469         device->flags.initialized = true;
1470         device->flags.spi_i2c_slave = acpi_is_spi_i2c_slave(device);
1471         acpi_device_clear_enumerated(device);
1472         device_initialize(&device->dev);
1473         dev_set_uevent_suppress(&device->dev, true);
1474         acpi_init_coherency(device);
1475 }
1476
1477 void acpi_device_add_finalize(struct acpi_device *device)
1478 {
1479         dev_set_uevent_suppress(&device->dev, false);
1480         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1481 }
1482
1483 static int acpi_add_single_object(struct acpi_device **child,
1484                                   acpi_handle handle, int type,
1485                                   unsigned long long sta)
1486 {
1487         int result;
1488         struct acpi_device *device;
1489         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1490
1491         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1492         if (!device) {
1493                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1494                 return -ENOMEM;
1495         }
1496
1497         acpi_init_device_object(device, handle, type, sta);
1498         acpi_bus_get_power_flags(device);
1499         acpi_bus_get_wakeup_device_flags(device);
1500
1501         result = acpi_device_add(device, acpi_device_release);
1502         if (result) {
1503                 acpi_device_release(&device->dev);
1504                 return result;
1505         }
1506
1507         acpi_power_add_remove_device(device, true);
1508         acpi_device_add_finalize(device);
1509         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1510         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1511                 dev_name(&device->dev), (char *) buffer.pointer,
1512                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1513         kfree(buffer.pointer);
1514         *child = device;
1515         return 0;
1516 }
1517
1518 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1519                                             void *context)
1520 {
1521         struct resource *res = context;
1522
1523         if (acpi_dev_resource_memory(ares, res))
1524                 return AE_CTRL_TERMINATE;
1525
1526         return AE_OK;
1527 }
1528
1529 static bool acpi_device_should_be_hidden(acpi_handle handle)
1530 {
1531         acpi_status status;
1532         struct resource res;
1533
1534         /* Check if it should ignore the UART device */
1535         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1536                 return false;
1537
1538         /*
1539          * The UART device described in SPCR table is assumed to have only one
1540          * memory resource present. So we only look for the first one here.
1541          */
1542         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1543                                      acpi_get_resource_memory, &res);
1544         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1545                 return false;
1546
1547         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1548                          &res.start);
1549
1550         return true;
1551 }
1552
1553 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1554                                     unsigned long long *sta)
1555 {
1556         acpi_status status;
1557         acpi_object_type acpi_type;
1558
1559         status = acpi_get_type(handle, &acpi_type);
1560         if (ACPI_FAILURE(status))
1561                 return -ENODEV;
1562
1563         switch (acpi_type) {
1564         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1565         case ACPI_TYPE_DEVICE:
1566                 if (acpi_device_should_be_hidden(handle))
1567                         return -ENODEV;
1568
1569                 *type = ACPI_BUS_TYPE_DEVICE;
1570                 status = acpi_bus_get_status_handle(handle, sta);
1571                 if (ACPI_FAILURE(status))
1572                         *sta = 0;
1573                 break;
1574         case ACPI_TYPE_PROCESSOR:
1575                 *type = ACPI_BUS_TYPE_PROCESSOR;
1576                 status = acpi_bus_get_status_handle(handle, sta);
1577                 if (ACPI_FAILURE(status))
1578                         return -ENODEV;
1579                 break;
1580         case ACPI_TYPE_THERMAL:
1581                 *type = ACPI_BUS_TYPE_THERMAL;
1582                 *sta = ACPI_STA_DEFAULT;
1583                 break;
1584         case ACPI_TYPE_POWER:
1585                 *type = ACPI_BUS_TYPE_POWER;
1586                 *sta = ACPI_STA_DEFAULT;
1587                 break;
1588         default:
1589                 return -ENODEV;
1590         }
1591
1592         return 0;
1593 }
1594
1595 bool acpi_device_is_present(struct acpi_device *adev)
1596 {
1597         if (adev->status.present || adev->status.functional)
1598                 return true;
1599
1600         adev->flags.initialized = false;
1601         return false;
1602 }
1603
1604 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1605                                        const char *idstr,
1606                                        const struct acpi_device_id **matchid)
1607 {
1608         const struct acpi_device_id *devid;
1609
1610         if (handler->match)
1611                 return handler->match(idstr, matchid);
1612
1613         for (devid = handler->ids; devid->id[0]; devid++)
1614                 if (!strcmp((char *)devid->id, idstr)) {
1615                         if (matchid)
1616                                 *matchid = devid;
1617
1618                         return true;
1619                 }
1620
1621         return false;
1622 }
1623
1624 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1625                                         const struct acpi_device_id **matchid)
1626 {
1627         struct acpi_scan_handler *handler;
1628
1629         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1630                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1631                         return handler;
1632
1633         return NULL;
1634 }
1635
1636 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1637 {
1638         if (!!hotplug->enabled == !!val)
1639                 return;
1640
1641         mutex_lock(&acpi_scan_lock);
1642
1643         hotplug->enabled = val;
1644
1645         mutex_unlock(&acpi_scan_lock);
1646 }
1647
1648 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1649 {
1650         struct acpi_hardware_id *hwid;
1651
1652         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1653                 acpi_dock_add(adev);
1654                 return;
1655         }
1656         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1657                 struct acpi_scan_handler *handler;
1658
1659                 handler = acpi_scan_match_handler(hwid->id, NULL);
1660                 if (handler) {
1661                         adev->flags.hotplug_notify = true;
1662                         break;
1663                 }
1664         }
1665 }
1666
1667 static void acpi_device_dep_initialize(struct acpi_device *adev)
1668 {
1669         struct acpi_dep_data *dep;
1670         struct acpi_handle_list dep_devices;
1671         acpi_status status;
1672         int i;
1673
1674         if (!acpi_has_method(adev->handle, "_DEP"))
1675                 return;
1676
1677         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1678                                         &dep_devices);
1679         if (ACPI_FAILURE(status)) {
1680                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1681                 return;
1682         }
1683
1684         for (i = 0; i < dep_devices.count; i++) {
1685                 struct acpi_device_info *info;
1686                 int skip;
1687
1688                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1689                 if (ACPI_FAILURE(status)) {
1690                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1691                         continue;
1692                 }
1693
1694                 /*
1695                  * Skip the dependency of Windows System Power
1696                  * Management Controller
1697                  */
1698                 skip = info->valid & ACPI_VALID_HID &&
1699                         !strcmp(info->hardware_id.string, "INT3396");
1700
1701                 kfree(info);
1702
1703                 if (skip)
1704                         continue;
1705
1706                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1707                 if (!dep)
1708                         return;
1709
1710                 dep->master = dep_devices.handles[i];
1711                 dep->slave  = adev->handle;
1712                 adev->dep_unmet++;
1713
1714                 mutex_lock(&acpi_dep_list_lock);
1715                 list_add_tail(&dep->node , &acpi_dep_list);
1716                 mutex_unlock(&acpi_dep_list_lock);
1717         }
1718 }
1719
1720 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1721                                       void *not_used, void **return_value)
1722 {
1723         struct acpi_device *device = NULL;
1724         int type;
1725         unsigned long long sta;
1726         int result;
1727
1728         acpi_bus_get_device(handle, &device);
1729         if (device)
1730                 goto out;
1731
1732         result = acpi_bus_type_and_status(handle, &type, &sta);
1733         if (result)
1734                 return AE_OK;
1735
1736         if (type == ACPI_BUS_TYPE_POWER) {
1737                 acpi_add_power_resource(handle);
1738                 return AE_OK;
1739         }
1740
1741         acpi_add_single_object(&device, handle, type, sta);
1742         if (!device)
1743                 return AE_CTRL_DEPTH;
1744
1745         acpi_scan_init_hotplug(device);
1746         acpi_device_dep_initialize(device);
1747
1748  out:
1749         if (!*return_value)
1750                 *return_value = device;
1751
1752         return AE_OK;
1753 }
1754
1755 static void acpi_default_enumeration(struct acpi_device *device)
1756 {
1757         /*
1758          * Do not enumerate SPI/I2C slaves as they will be enumerated by their
1759          * respective parents.
1760          */
1761         if (!device->flags.spi_i2c_slave) {
1762                 acpi_create_platform_device(device, NULL);
1763                 acpi_device_set_enumerated(device);
1764         } else {
1765                 blocking_notifier_call_chain(&acpi_reconfig_chain,
1766                                              ACPI_RECONFIG_DEVICE_ADD, device);
1767         }
1768 }
1769
1770 static const struct acpi_device_id generic_device_ids[] = {
1771         {ACPI_DT_NAMESPACE_HID, },
1772         {"", },
1773 };
1774
1775 static int acpi_generic_device_attach(struct acpi_device *adev,
1776                                       const struct acpi_device_id *not_used)
1777 {
1778         /*
1779          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1780          * below can be unconditional.
1781          */
1782         if (adev->data.of_compatible)
1783                 acpi_default_enumeration(adev);
1784
1785         return 1;
1786 }
1787
1788 static struct acpi_scan_handler generic_device_handler = {
1789         .ids = generic_device_ids,
1790         .attach = acpi_generic_device_attach,
1791 };
1792
1793 static int acpi_scan_attach_handler(struct acpi_device *device)
1794 {
1795         struct acpi_hardware_id *hwid;
1796         int ret = 0;
1797
1798         list_for_each_entry(hwid, &device->pnp.ids, list) {
1799                 const struct acpi_device_id *devid;
1800                 struct acpi_scan_handler *handler;
1801
1802                 handler = acpi_scan_match_handler(hwid->id, &devid);
1803                 if (handler) {
1804                         if (!handler->attach) {
1805                                 device->pnp.type.platform_id = 0;
1806                                 continue;
1807                         }
1808                         device->handler = handler;
1809                         ret = handler->attach(device, devid);
1810                         if (ret > 0)
1811                                 break;
1812
1813                         device->handler = NULL;
1814                         if (ret < 0)
1815                                 break;
1816                 }
1817         }
1818
1819         return ret;
1820 }
1821
1822 static void acpi_bus_attach(struct acpi_device *device)
1823 {
1824         struct acpi_device *child;
1825         acpi_handle ejd;
1826         int ret;
1827
1828         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1829                 register_dock_dependent_device(device, ejd);
1830
1831         acpi_bus_get_status(device);
1832         /* Skip devices that are not present. */
1833         if (!acpi_device_is_present(device)) {
1834                 acpi_device_clear_enumerated(device);
1835                 device->flags.power_manageable = 0;
1836                 return;
1837         }
1838         if (device->handler)
1839                 goto ok;
1840
1841         if (!device->flags.initialized) {
1842                 device->flags.power_manageable =
1843                         device->power.states[ACPI_STATE_D0].flags.valid;
1844                 if (acpi_bus_init_power(device))
1845                         device->flags.power_manageable = 0;
1846
1847                 device->flags.initialized = true;
1848         } else if (device->flags.visited) {
1849                 goto ok;
1850         }
1851
1852         ret = acpi_scan_attach_handler(device);
1853         if (ret < 0)
1854                 return;
1855
1856         device->flags.match_driver = true;
1857         if (ret > 0 && !device->flags.spi_i2c_slave) {
1858                 acpi_device_set_enumerated(device);
1859                 goto ok;
1860         }
1861
1862         ret = device_attach(&device->dev);
1863         if (ret < 0)
1864                 return;
1865
1866         if (!device->pnp.type.platform_id && !device->flags.spi_i2c_slave)
1867                 acpi_device_set_enumerated(device);
1868         else
1869                 acpi_default_enumeration(device);
1870
1871  ok:
1872         list_for_each_entry(child, &device->children, node)
1873                 acpi_bus_attach(child);
1874
1875         if (device->handler && device->handler->hotplug.notify_online)
1876                 device->handler->hotplug.notify_online(device);
1877 }
1878
1879 void acpi_walk_dep_device_list(acpi_handle handle)
1880 {
1881         struct acpi_dep_data *dep, *tmp;
1882         struct acpi_device *adev;
1883
1884         mutex_lock(&acpi_dep_list_lock);
1885         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
1886                 if (dep->master == handle) {
1887                         acpi_bus_get_device(dep->slave, &adev);
1888                         if (!adev)
1889                                 continue;
1890
1891                         adev->dep_unmet--;
1892                         if (!adev->dep_unmet)
1893                                 acpi_bus_attach(adev);
1894                         list_del(&dep->node);
1895                         kfree(dep);
1896                 }
1897         }
1898         mutex_unlock(&acpi_dep_list_lock);
1899 }
1900 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
1901
1902 /**
1903  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1904  * @handle: Root of the namespace scope to scan.
1905  *
1906  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1907  * found devices.
1908  *
1909  * If no devices were found, -ENODEV is returned, but it does not mean that
1910  * there has been a real error.  There just have been no suitable ACPI objects
1911  * in the table trunk from which the kernel could create a device and add an
1912  * appropriate driver.
1913  *
1914  * Must be called under acpi_scan_lock.
1915  */
1916 int acpi_bus_scan(acpi_handle handle)
1917 {
1918         void *device = NULL;
1919
1920         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1921                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1922                                     acpi_bus_check_add, NULL, NULL, &device);
1923
1924         if (device) {
1925                 acpi_bus_attach(device);
1926                 return 0;
1927         }
1928         return -ENODEV;
1929 }
1930 EXPORT_SYMBOL(acpi_bus_scan);
1931
1932 /**
1933  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
1934  * @adev: Root of the ACPI namespace scope to walk.
1935  *
1936  * Must be called under acpi_scan_lock.
1937  */
1938 void acpi_bus_trim(struct acpi_device *adev)
1939 {
1940         struct acpi_scan_handler *handler = adev->handler;
1941         struct acpi_device *child;
1942
1943         list_for_each_entry_reverse(child, &adev->children, node)
1944                 acpi_bus_trim(child);
1945
1946         adev->flags.match_driver = false;
1947         if (handler) {
1948                 if (handler->detach)
1949                         handler->detach(adev);
1950
1951                 adev->handler = NULL;
1952         } else {
1953                 device_release_driver(&adev->dev);
1954         }
1955         /*
1956          * Most likely, the device is going away, so put it into D3cold before
1957          * that.
1958          */
1959         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
1960         adev->flags.initialized = false;
1961         acpi_device_clear_enumerated(adev);
1962 }
1963 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1964
1965 static int acpi_bus_scan_fixed(void)
1966 {
1967         int result = 0;
1968
1969         /*
1970          * Enumerate all fixed-feature devices.
1971          */
1972         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1973                 struct acpi_device *device = NULL;
1974
1975                 result = acpi_add_single_object(&device, NULL,
1976                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1977                                                 ACPI_STA_DEFAULT);
1978                 if (result)
1979                         return result;
1980
1981                 device->flags.match_driver = true;
1982                 result = device_attach(&device->dev);
1983                 if (result < 0)
1984                         return result;
1985
1986                 device_init_wakeup(&device->dev, true);
1987         }
1988
1989         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1990                 struct acpi_device *device = NULL;
1991
1992                 result = acpi_add_single_object(&device, NULL,
1993                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1994                                                 ACPI_STA_DEFAULT);
1995                 if (result)
1996                         return result;
1997
1998                 device->flags.match_driver = true;
1999                 result = device_attach(&device->dev);
2000         }
2001
2002         return result < 0 ? result : 0;
2003 }
2004
2005 static void __init acpi_get_spcr_uart_addr(void)
2006 {
2007         acpi_status status;
2008         struct acpi_table_spcr *spcr_ptr;
2009
2010         status = acpi_get_table(ACPI_SIG_SPCR, 0,
2011                                 (struct acpi_table_header **)&spcr_ptr);
2012         if (ACPI_SUCCESS(status))
2013                 spcr_uart_addr = spcr_ptr->serial_port.address;
2014         else
2015                 printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
2016 }
2017
2018 static bool acpi_scan_initialized;
2019
2020 int __init acpi_scan_init(void)
2021 {
2022         int result;
2023         acpi_status status;
2024         struct acpi_table_stao *stao_ptr;
2025
2026         acpi_pci_root_init();
2027         acpi_pci_link_init();
2028         acpi_processor_init();
2029         acpi_lpss_init();
2030         acpi_apd_init();
2031         acpi_cmos_rtc_init();
2032         acpi_container_init();
2033         acpi_memory_hotplug_init();
2034         acpi_pnp_init();
2035         acpi_int340x_thermal_init();
2036         acpi_amba_init();
2037         acpi_watchdog_init();
2038
2039         acpi_scan_add_handler(&generic_device_handler);
2040
2041         /*
2042          * If there is STAO table, check whether it needs to ignore the UART
2043          * device in SPCR table.
2044          */
2045         status = acpi_get_table(ACPI_SIG_STAO, 0,
2046                                 (struct acpi_table_header **)&stao_ptr);
2047         if (ACPI_SUCCESS(status)) {
2048                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2049                         printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
2050
2051                 if (stao_ptr->ignore_uart)
2052                         acpi_get_spcr_uart_addr();
2053         }
2054
2055         mutex_lock(&acpi_scan_lock);
2056         /*
2057          * Enumerate devices in the ACPI namespace.
2058          */
2059         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2060         if (result)
2061                 goto out;
2062
2063         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2064         if (result)
2065                 goto out;
2066
2067         /* Fixed feature devices do not exist on HW-reduced platform */
2068         if (!acpi_gbl_reduced_hardware) {
2069                 result = acpi_bus_scan_fixed();
2070                 if (result) {
2071                         acpi_detach_data(acpi_root->handle,
2072                                          acpi_scan_drop_device);
2073                         acpi_device_del(acpi_root);
2074                         put_device(&acpi_root->dev);
2075                         goto out;
2076                 }
2077         }
2078
2079         acpi_gpe_apply_masked_gpes();
2080         acpi_update_all_gpes();
2081         acpi_ec_ecdt_start();
2082
2083         acpi_scan_initialized = true;
2084
2085  out:
2086         mutex_unlock(&acpi_scan_lock);
2087         return result;
2088 }
2089
2090 static struct acpi_probe_entry *ape;
2091 static int acpi_probe_count;
2092 static DEFINE_MUTEX(acpi_probe_mutex);
2093
2094 static int __init acpi_match_madt(struct acpi_subtable_header *header,
2095                                   const unsigned long end)
2096 {
2097         if (!ape->subtable_valid || ape->subtable_valid(header, ape))
2098                 if (!ape->probe_subtbl(header, end))
2099                         acpi_probe_count++;
2100
2101         return 0;
2102 }
2103
2104 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2105 {
2106         int count = 0;
2107
2108         if (acpi_disabled)
2109                 return 0;
2110
2111         mutex_lock(&acpi_probe_mutex);
2112         for (ape = ap_head; nr; ape++, nr--) {
2113                 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
2114                         acpi_probe_count = 0;
2115                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2116                         count += acpi_probe_count;
2117                 } else {
2118                         int res;
2119                         res = acpi_table_parse(ape->id, ape->probe_table);
2120                         if (!res)
2121                                 count++;
2122                 }
2123         }
2124         mutex_unlock(&acpi_probe_mutex);
2125
2126         return count;
2127 }
2128
2129 struct acpi_table_events_work {
2130         struct work_struct work;
2131         void *table;
2132         u32 event;
2133 };
2134
2135 static void acpi_table_events_fn(struct work_struct *work)
2136 {
2137         struct acpi_table_events_work *tew;
2138
2139         tew = container_of(work, struct acpi_table_events_work, work);
2140
2141         if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2142                 acpi_scan_lock_acquire();
2143                 acpi_bus_scan(ACPI_ROOT_OBJECT);
2144                 acpi_scan_lock_release();
2145         }
2146
2147         kfree(tew);
2148 }
2149
2150 void acpi_scan_table_handler(u32 event, void *table, void *context)
2151 {
2152         struct acpi_table_events_work *tew;
2153
2154         if (!acpi_scan_initialized)
2155                 return;
2156
2157         if (event != ACPI_TABLE_EVENT_LOAD)
2158                 return;
2159
2160         tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2161         if (!tew)
2162                 return;
2163
2164         INIT_WORK(&tew->work, acpi_table_events_fn);
2165         tew->table = table;
2166         tew->event = event;
2167
2168         schedule_work(&tew->work);
2169 }
2170
2171 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2172 {
2173         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2174 }
2175 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2176
2177 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2178 {
2179         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2180 }
2181 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);