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 static 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 struct acpi_dep_data {
  50         struct list_head node;
  51         acpi_handle master;
  52         acpi_handle slave;
  53 };
  54
  55 struct acpi_device_bus_id{
  56         char bus_id[15];
  57         unsigned int instance_no;
  58         struct list_head node;
  59 };
  60
  61 void acpi_scan_lock_acquire(void)
  62 {
  63         mutex_lock(&acpi_scan_lock);
  64 }
  65 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  66
  67 void acpi_scan_lock_release(void)
  68 {
  69         mutex_unlock(&acpi_scan_lock);
  70 }
  71 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  72
  73 void acpi_lock_hp_context(void)
  74 {
  75         mutex_lock(&acpi_hp_context_lock);
  76 }
  77
  78 void acpi_unlock_hp_context(void)
  79 {
  80         mutex_unlock(&acpi_hp_context_lock);
  81 }
  82
  83 void acpi_initialize_hp_context(struct acpi_device *adev,
  84                                 struct acpi_hotplug_context *hp,
  85                                 int (*notify)(struct acpi_device *, u32),
  86                                 void (*uevent)(struct acpi_device *, u32))
  87 {
  88         acpi_lock_hp_context();
  89         hp->notify = notify;
  90         hp->uevent = uevent;
  91         acpi_set_hp_context(adev, hp);
  92         acpi_unlock_hp_context();
  93 }
  94 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
  95
  96 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  97 {
  98         if (!handler)
  99                 return -EINVAL;
 100
 101         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
 102         return 0;
 103 }
 104
 105 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
 106                                        const char *hotplug_profile_name)
 107 {
 108         int error;
 109
 110         error = acpi_scan_add_handler(handler);
 111         if (error)
 112                 return error;
 113
 114         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
 115         return 0;
 116 }
 117
 118 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 119 {
 120         struct acpi_device_physical_node *pn;
 121         bool offline = true;
 122
 123         /*
 124          * acpi_container_offline() calls this for all of the container's
 125          * children under the container's physical_node_lock lock.
 126          */
 127         mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
 128
 129         list_for_each_entry(pn, &adev->physical_node_list, node)
 130                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
 131                         if (uevent)
 132                                 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
 133
 134                         offline = false;
 135                         break;
 136                 }
 137
 138         mutex_unlock(&adev->physical_node_lock);
 139         return offline;
 140 }
 141
 142 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 143                                     void **ret_p)
 144 {
 145         struct acpi_device *device = NULL;
 146         struct acpi_device_physical_node *pn;
 147         bool second_pass = (bool)data;
 148         acpi_status status = AE_OK;
 149
 150         if (acpi_bus_get_device(handle, &device))
 151                 return AE_OK;
 152
 153         if (device->handler && !device->handler->hotplug.enabled) {
 154                 *ret_p = &device->dev;
 155                 return AE_SUPPORT;
 156         }
 157
 158         mutex_lock(&device->physical_node_lock);
 159
 160         list_for_each_entry(pn, &device->physical_node_list, node) {
 161                 int ret;
 162
 163                 if (second_pass) {
 164                         /* Skip devices offlined by the first pass. */
 165                         if (pn->put_online)
 166                                 continue;
 167                 } else {
 168                         pn->put_online = false;
 169                 }
 170                 ret = device_offline(pn->dev);
 171                 if (acpi_force_hot_remove)
 172                         continue;
 173
 174                 if (ret >= 0) {
 175                         pn->put_online = !ret;
 176                 } else {
 177                         *ret_p = pn->dev;
 178                         if (second_pass) {
 179                                 status = AE_ERROR;
 180                                 break;
 181                         }
 182                 }
 183         }
 184
 185         mutex_unlock(&device->physical_node_lock);
 186
 187         return status;
 188 }
 189
 190 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 191                                    void **ret_p)
 192 {
 193         struct acpi_device *device = NULL;
 194         struct acpi_device_physical_node *pn;
 195
 196         if (acpi_bus_get_device(handle, &device))
 197                 return AE_OK;
 198
 199         mutex_lock(&device->physical_node_lock);
 200
 201         list_for_each_entry(pn, &device->physical_node_list, node)
 202                 if (pn->put_online) {
 203                         device_online(pn->dev);
 204                         pn->put_online = false;
 205                 }
 206
 207         mutex_unlock(&device->physical_node_lock);
 208
 209         return AE_OK;
 210 }
 211
 212 static int acpi_scan_try_to_offline(struct acpi_device *device)
 213 {
 214         acpi_handle handle = device->handle;
 215         struct device *errdev = NULL;
 216         acpi_status status;
 217
 218         /*
 219          * Carry out two passes here and ignore errors in the first pass,
 220          * because if the devices in question are memory blocks and
 221          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 222          * that the other blocks depend on, but it is not known in advance which
 223          * block holds them.
 224          *
 225          * If the first pass is successful, the second one isn't needed, though.
 226          */
 227         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 228                                      NULL, acpi_bus_offline, (void *)false,
 229                                      (void **)&errdev);
 230         if (status == AE_SUPPORT) {
 231                 dev_warn(errdev, "Offline disabled.\n");
 232                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 233                                     acpi_bus_online, NULL, NULL, NULL);
 234                 return -EPERM;
 235         }
 236         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
 237         if (errdev) {
 238                 errdev = NULL;
 239                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 240                                     NULL, acpi_bus_offline, (void *)true,
 241                                     (void **)&errdev);
 242                 if (!errdev || acpi_force_hot_remove)
 243                         acpi_bus_offline(handle, 0, (void *)true,
 244                                          (void **)&errdev);
 245
 246                 if (errdev && !acpi_force_hot_remove) {
 247                         dev_warn(errdev, "Offline failed.\n");
 248                         acpi_bus_online(handle, 0, NULL, NULL);
 249                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 250                                             ACPI_UINT32_MAX, acpi_bus_online,
 251                                             NULL, NULL, NULL);
 252                         return -EBUSY;
 253                 }
 254         }
 255         return 0;
 256 }
 257
 258 static int acpi_scan_hot_remove(struct acpi_device *device)
 259 {
 260         acpi_handle handle = device->handle;
 261         unsigned long long sta;
 262         acpi_status status;
 263
 264         if (device->handler && device->handler->hotplug.demand_offline
 265             && !acpi_force_hot_remove) {
 266                 if (!acpi_scan_is_offline(device, true))
 267                         return -EBUSY;
 268         } else {
 269                 int error = acpi_scan_try_to_offline(device);
 270                 if (error)
 271                         return error;
 272         }
 273
 274         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 275                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 276
 277         acpi_bus_trim(device);
 278
 279         acpi_evaluate_lck(handle, 0);
 280         /*
 281          * TBD: _EJD support.
 282          */
 283         status = acpi_evaluate_ej0(handle);
 284         if (status == AE_NOT_FOUND)
 285                 return -ENODEV;
 286         else if (ACPI_FAILURE(status))
 287                 return -EIO;
 288
 289         /*
 290          * Verify if eject was indeed successful.  If not, log an error
 291          * message.  No need to call _OST since _EJ0 call was made OK.
 292          */
 293         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 294         if (ACPI_FAILURE(status)) {
 295                 acpi_handle_warn(handle,
 296                         "Status check after eject failed (0x%x)\n", status);
 297         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 298                 acpi_handle_warn(handle,
 299                         "Eject incomplete - status 0x%llx\n", sta);
 300         }
 301
 302         return 0;
 303 }
 304
 305 static int acpi_scan_device_not_present(struct acpi_device *adev)
 306 {
 307         if (!acpi_device_enumerated(adev)) {
 308                 dev_warn(&adev->dev, "Still not present\n");
 309                 return -EALREADY;
 310         }
 311         acpi_bus_trim(adev);
 312         return 0;
 313 }
 314
 315 static int acpi_scan_device_check(struct acpi_device *adev)
 316 {
 317         int error;
 318
 319         acpi_bus_get_status(adev);
 320         if (adev->status.present || adev->status.functional) {
 321                 /*
 322                  * This function is only called for device objects for which
 323                  * matching scan handlers exist.  The only situation in which
 324                  * the scan handler is not attached to this device object yet
 325                  * is when the device has just appeared (either it wasn't
 326                  * present at all before or it was removed and then added
 327                  * again).
 328                  */
 329                 if (adev->handler) {
 330                         dev_warn(&adev->dev, "Already enumerated\n");
 331                         return -EALREADY;
 332                 }
 333                 error = acpi_bus_scan(adev->handle);
 334                 if (error) {
 335                         dev_warn(&adev->dev, "Namespace scan failure\n");
 336                         return error;
 337                 }
 338                 if (!adev->handler) {
 339                         dev_warn(&adev->dev, "Enumeration failure\n");
 340                         error = -ENODEV;
 341                 }
 342         } else {
 343                 error = acpi_scan_device_not_present(adev);
 344         }
 345         return error;
 346 }
 347
 348 static int acpi_scan_bus_check(struct acpi_device *adev)
 349 {
 350         struct acpi_scan_handler *handler = adev->handler;
 351         struct acpi_device *child;
 352         int error;
 353
 354         acpi_bus_get_status(adev);
 355         if (!(adev->status.present || adev->status.functional)) {
 356                 acpi_scan_device_not_present(adev);
 357                 return 0;
 358         }
 359         if (handler && handler->hotplug.scan_dependent)
 360                 return handler->hotplug.scan_dependent(adev);
 361
 362         error = acpi_bus_scan(adev->handle);
 363         if (error) {
 364                 dev_warn(&adev->dev, "Namespace scan failure\n");
 365                 return error;
 366         }
 367         list_for_each_entry(child, &adev->children, node) {
 368                 error = acpi_scan_bus_check(child);
 369                 if (error)
 370                         return error;
 371         }
 372         return 0;
 373 }
 374
 375 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 376 {
 377         switch (type) {
 378         case ACPI_NOTIFY_BUS_CHECK:
 379                 return acpi_scan_bus_check(adev);
 380         case ACPI_NOTIFY_DEVICE_CHECK:
 381                 return acpi_scan_device_check(adev);
 382         case ACPI_NOTIFY_EJECT_REQUEST:
 383         case ACPI_OST_EC_OSPM_EJECT:
 384                 if (adev->handler && !adev->handler->hotplug.enabled) {
 385                         dev_info(&adev->dev, "Eject disabled\n");
 386                         return -EPERM;
 387                 }
 388                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 389                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 390                 return acpi_scan_hot_remove(adev);
 391         }
 392         return -EINVAL;
 393 }
 394
 395 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 396 {
 397         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 398         int error = -ENODEV;
 399
 400         lock_device_hotplug();
 401         mutex_lock(&acpi_scan_lock);
 402
 403         /*
 404          * The device object's ACPI handle cannot become invalid as long as we
 405          * are holding acpi_scan_lock, but it might have become invalid before
 406          * that lock was acquired.
 407          */
 408         if (adev->handle == INVALID_ACPI_HANDLE)
 409                 goto err_out;
 410
 411         if (adev->flags.is_dock_station) {
 412                 error = dock_notify(adev, src);
 413         } else if (adev->flags.hotplug_notify) {
 414                 error = acpi_generic_hotplug_event(adev, src);
 415                 if (error == -EPERM) {
 416                         ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 417                         goto err_out;
 418                 }
 419         } else {
 420                 int (*notify)(struct acpi_device *, u32);
 421
 422                 acpi_lock_hp_context();
 423                 notify = adev->hp ? adev->hp->notify : NULL;
 424                 acpi_unlock_hp_context();
 425                 /*
 426                  * There may be additional notify handlers for device objects
 427                  * without the .event() callback, so ignore them here.
 428                  */
 429                 if (notify)
 430                         error = notify(adev, src);
 431                 else
 432                         goto out;
 433         }
 434         if (!error)
 435                 ost_code = ACPI_OST_SC_SUCCESS;
 436
 437  err_out:
 438         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 439
 440  out:
 441         acpi_bus_put_acpi_device(adev);
 442         mutex_unlock(&acpi_scan_lock);
 443         unlock_device_hotplug();
 444 }
 445
 446 static void acpi_free_power_resources_lists(struct acpi_device *device)
 447 {
 448         int i;
 449
 450         if (device->wakeup.flags.valid)
 451                 acpi_power_resources_list_free(&device->wakeup.resources);
 452
 453         if (!device->power.flags.power_resources)
 454                 return;
 455
 456         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 457                 struct acpi_device_power_state *ps = &device->power.states[i];
 458                 acpi_power_resources_list_free(&ps->resources);
 459         }
 460 }
 461
 462 static void acpi_device_release(struct device *dev)
 463 {
 464         struct acpi_device *acpi_dev = to_acpi_device(dev);
 465
 466         acpi_free_properties(acpi_dev);
 467         acpi_free_pnp_ids(&acpi_dev->pnp);
 468         acpi_free_power_resources_lists(acpi_dev);
 469         kfree(acpi_dev);
 470 }
 471
 472 static void acpi_device_del(struct acpi_device *device)
 473 {
 474         mutex_lock(&acpi_device_lock);
 475         if (device->parent)
 476                 list_del(&device->node);
 477
 478         list_del(&device->wakeup_list);
 479         mutex_unlock(&acpi_device_lock);
 480
 481         acpi_power_add_remove_device(device, false);
 482         acpi_device_remove_files(device);
 483         if (device->remove)
 484                 device->remove(device);
 485
 486         device_del(&device->dev);
 487 }
 488
 489 static LIST_HEAD(acpi_device_del_list);
 490 static DEFINE_MUTEX(acpi_device_del_lock);
 491
 492 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 493 {
 494         for (;;) {
 495                 struct acpi_device *adev;
 496
 497                 mutex_lock(&acpi_device_del_lock);
 498
 499                 if (list_empty(&acpi_device_del_list)) {
 500                         mutex_unlock(&acpi_device_del_lock);
 501                         break;
 502                 }
 503                 adev = list_first_entry(&acpi_device_del_list,
 504                                         struct acpi_device, del_list);
 505                 list_del(&adev->del_list);
 506
 507                 mutex_unlock(&acpi_device_del_lock);
 508
 509                 acpi_device_del(adev);
 510                 /*
 511                  * Drop references to all power resources that might have been
 512                  * used by the device.
 513                  */
 514                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
 515                 put_device(&adev->dev);
 516         }
 517 }
 518
 519 /**
 520  * acpi_scan_drop_device - Drop an ACPI device object.
 521  * @handle: Handle of an ACPI namespace node, not used.
 522  * @context: Address of the ACPI device object to drop.
 523  *
 524  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
 525  * namespace node the device object pointed to by @context is attached to.
 526  *
 527  * The unregistration is carried out asynchronously to avoid running
 528  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
 529  * ensure the correct ordering (the device objects must be unregistered in the
 530  * same order in which the corresponding namespace nodes are deleted).
 531  */
 532 static void acpi_scan_drop_device(acpi_handle handle, void *context)
 533 {
 534         static DECLARE_WORK(work, acpi_device_del_work_fn);
 535         struct acpi_device *adev = context;
 536
 537         mutex_lock(&acpi_device_del_lock);
 538
 539         /*
 540          * Use the ACPI hotplug workqueue which is ordered, so this work item
 541          * won't run after any hotplug work items submitted subsequently.  That
 542          * prevents attempts to register device objects identical to those being
 543          * deleted from happening concurrently (such attempts result from
 544          * hotplug events handled via the ACPI hotplug workqueue).  It also will
 545          * run after all of the work items submitted previosuly, which helps
 546          * those work items to ensure that they are not accessing stale device
 547          * objects.
 548          */
 549         if (list_empty(&acpi_device_del_list))
 550                 acpi_queue_hotplug_work(&work);
 551
 552         list_add_tail(&adev->del_list, &acpi_device_del_list);
 553         /* Make acpi_ns_validate_handle() return NULL for this handle. */
 554         adev->handle = INVALID_ACPI_HANDLE;
 555
 556         mutex_unlock(&acpi_device_del_lock);
 557 }
 558
 559 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
 560                                 void (*callback)(void *))
 561 {
 562         acpi_status status;
 563
 564         if (!device)
 565                 return -EINVAL;
 566
 567         status = acpi_get_data_full(handle, acpi_scan_drop_device,
 568                                     (void **)device, callback);
 569         if (ACPI_FAILURE(status) || !*device) {
 570                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 571                                   handle));
 572                 return -ENODEV;
 573         }
 574         return 0;
 575 }
 576
 577 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 578 {
 579         return acpi_get_device_data(handle, device, NULL);
 580 }
 581 EXPORT_SYMBOL(acpi_bus_get_device);
 582
 583 static void get_acpi_device(void *dev)
 584 {
 585         if (dev)
 586                 get_device(&((struct acpi_device *)dev)->dev);
 587 }
 588
 589 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 590 {
 591         struct acpi_device *adev = NULL;
 592
 593         acpi_get_device_data(handle, &adev, get_acpi_device);
 594         return adev;
 595 }
 596
 597 void acpi_bus_put_acpi_device(struct acpi_device *adev)
 598 {
 599         put_device(&adev->dev);
 600 }
 601
 602 int acpi_device_add(struct acpi_device *device,
 603                     void (*release)(struct device *))
 604 {
 605         int result;
 606         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 607         int found = 0;
 608
 609         if (device->handle) {
 610                 acpi_status status;
 611
 612                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
 613                                           device);
 614                 if (ACPI_FAILURE(status)) {
 615                         acpi_handle_err(device->handle,
 616                                         "Unable to attach device data\n");
 617                         return -ENODEV;
 618                 }
 619         }
 620
 621         /*
 622          * Linkage
 623          * -------
 624          * Link this device to its parent and siblings.
 625          */
 626         INIT_LIST_HEAD(&device->children);
 627         INIT_LIST_HEAD(&device->node);
 628         INIT_LIST_HEAD(&device->wakeup_list);
 629         INIT_LIST_HEAD(&device->physical_node_list);
 630         INIT_LIST_HEAD(&device->del_list);
 631         mutex_init(&device->physical_node_lock);
 632
 633         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 634         if (!new_bus_id) {
 635                 pr_err(PREFIX "Memory allocation error\n");
 636                 result = -ENOMEM;
 637                 goto err_detach;
 638         }
 639
 640         mutex_lock(&acpi_device_lock);
 641         /*
 642          * Find suitable bus_id and instance number in acpi_bus_id_list
 643          * If failed, create one and link it into acpi_bus_id_list
 644          */
 645         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 646                 if (!strcmp(acpi_device_bus_id->bus_id,
 647                             acpi_device_hid(device))) {
 648                         acpi_device_bus_id->instance_no++;
 649                         found = 1;
 650                         kfree(new_bus_id);
 651                         break;
 652                 }
 653         }
 654         if (!found) {
 655                 acpi_device_bus_id = new_bus_id;
 656                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 657                 acpi_device_bus_id->instance_no = 0;
 658                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 659         }
 660         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 661
 662         if (device->parent)
 663                 list_add_tail(&device->node, &device->parent->children);
 664
 665         if (device->wakeup.flags.valid)
 666                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 667         mutex_unlock(&acpi_device_lock);
 668
 669         if (device->parent)
 670                 device->dev.parent = &device->parent->dev;
 671         device->dev.bus = &acpi_bus_type;
 672         device->dev.release = release;
 673         result = device_add(&device->dev);
 674         if (result) {
 675                 dev_err(&device->dev, "Error registering device\n");
 676                 goto err;
 677         }
 678
 679         result = acpi_device_setup_files(device);
 680         if (result)
 681                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 682                        dev_name(&device->dev));
 683
 684         return 0;
 685
 686  err:
 687         mutex_lock(&acpi_device_lock);
 688         if (device->parent)
 689                 list_del(&device->node);
 690         list_del(&device->wakeup_list);
 691         mutex_unlock(&acpi_device_lock);
 692
 693  err_detach:
 694         acpi_detach_data(device->handle, acpi_scan_drop_device);
 695         return result;
 696 }
 697
 698 struct acpi_device *acpi_get_next_child(struct device *dev,
 699                                         struct acpi_device *child)
 700 {
 701         struct acpi_device *adev = ACPI_COMPANION(dev);
 702         struct list_head *head, *next;
 703
 704         if (!adev)
 705                 return NULL;
 706
 707         head = &adev->children;
 708         if (list_empty(head))
 709                 return NULL;
 710
 711         if (!child)
 712                 return list_first_entry(head, struct acpi_device, node);
 713
 714         next = child->node.next;
 715         return next == head ? NULL : list_entry(next, struct acpi_device, node);
 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                 if (!acpi_has_method(handle, "_BQC"))
1123                         printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
1124                                 "cannot determine initial brightness\n");
1125                 /* We have backlight support, no need to scan further */
1126                 return AE_CTRL_TERMINATE;
1127         }
1128         return 0;
1129 }
1130
1131 /* Returns true if the ACPI object is a video device which can be
1132  * handled by video.ko.
1133  * The device will get a Linux specific CID added in scan.c to
1134  * identify the device as an ACPI graphics device
1135  * Be aware that the graphics device may not be physically present
1136  * Use acpi_video_get_capabilities() to detect general ACPI video
1137  * capabilities of present cards
1138  */
1139 long acpi_is_video_device(acpi_handle handle)
1140 {
1141         long video_caps = 0;
1142
1143         /* Is this device able to support video switching ? */
1144         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1145                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1146
1147         /* Is this device able to retrieve a video ROM ? */
1148         if (acpi_has_method(handle, "_ROM"))
1149                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1150
1151         /* Is this device able to configure which video head to be POSTed ? */
1152         if (acpi_has_method(handle, "_VPO") &&
1153             acpi_has_method(handle, "_GPD") &&
1154             acpi_has_method(handle, "_SPD"))
1155                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1156
1157         /* Only check for backlight functionality if one of the above hit. */
1158         if (video_caps)
1159                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1160                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1161                                     &video_caps, NULL);
1162
1163         return video_caps;
1164 }
1165 EXPORT_SYMBOL(acpi_is_video_device);
1166
1167 const char *acpi_device_hid(struct acpi_device *device)
1168 {
1169         struct acpi_hardware_id *hid;
1170
1171         if (list_empty(&device->pnp.ids))
1172                 return dummy_hid;
1173
1174         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1175         return hid->id;
1176 }
1177 EXPORT_SYMBOL(acpi_device_hid);
1178
1179 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1180 {
1181         struct acpi_hardware_id *id;
1182
1183         id = kmalloc(sizeof(*id), GFP_KERNEL);
1184         if (!id)
1185                 return;
1186
1187         id->id = kstrdup(dev_id, GFP_KERNEL);
1188         if (!id->id) {
1189                 kfree(id);
1190                 return;
1191         }
1192
1193         list_add_tail(&id->list, &pnp->ids);
1194         pnp->type.hardware_id = 1;
1195 }
1196
1197 /*
1198  * Old IBM workstations have a DSDT bug wherein the SMBus object
1199  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1200  * prefix.  Work around this.
1201  */
1202 static bool acpi_ibm_smbus_match(acpi_handle handle)
1203 {
1204         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1205         struct acpi_buffer path = { sizeof(node_name), node_name };
1206
1207         if (!dmi_name_in_vendors("IBM"))
1208                 return false;
1209
1210         /* Look for SMBS object */
1211         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1212             strcmp("SMBS", path.pointer))
1213                 return false;
1214
1215         /* Does it have the necessary (but misnamed) methods? */
1216         if (acpi_has_method(handle, "SBI") &&
1217             acpi_has_method(handle, "SBR") &&
1218             acpi_has_method(handle, "SBW"))
1219                 return true;
1220
1221         return false;
1222 }
1223
1224 static bool acpi_object_is_system_bus(acpi_handle handle)
1225 {
1226         acpi_handle tmp;
1227
1228         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1229             tmp == handle)
1230                 return true;
1231         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1232             tmp == handle)
1233                 return true;
1234
1235         return false;
1236 }
1237
1238 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1239                                 int device_type)
1240 {
1241         acpi_status status;
1242         struct acpi_device_info *info;
1243         struct acpi_pnp_device_id_list *cid_list;
1244         int i;
1245
1246         switch (device_type) {
1247         case ACPI_BUS_TYPE_DEVICE:
1248                 if (handle == ACPI_ROOT_OBJECT) {
1249                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1250                         break;
1251                 }
1252
1253                 status = acpi_get_object_info(handle, &info);
1254                 if (ACPI_FAILURE(status)) {
1255                         pr_err(PREFIX "%s: Error reading device info\n",
1256                                         __func__);
1257                         return;
1258                 }
1259
1260                 if (info->valid & ACPI_VALID_HID) {
1261                         acpi_add_id(pnp, info->hardware_id.string);
1262                         pnp->type.platform_id = 1;
1263                 }
1264                 if (info->valid & ACPI_VALID_CID) {
1265                         cid_list = &info->compatible_id_list;
1266                         for (i = 0; i < cid_list->count; i++)
1267                                 acpi_add_id(pnp, cid_list->ids[i].string);
1268                 }
1269                 if (info->valid & ACPI_VALID_ADR) {
1270                         pnp->bus_address = info->address;
1271                         pnp->type.bus_address = 1;
1272                 }
1273                 if (info->valid & ACPI_VALID_UID)
1274                         pnp->unique_id = kstrdup(info->unique_id.string,
1275                                                         GFP_KERNEL);
1276                 if (info->valid & ACPI_VALID_CLS)
1277                         acpi_add_id(pnp, info->class_code.string);
1278
1279                 kfree(info);
1280
1281                 /*
1282                  * Some devices don't reliably have _HIDs & _CIDs, so add
1283                  * synthetic HIDs to make sure drivers can find them.
1284                  */
1285                 if (acpi_is_video_device(handle))
1286                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1287                 else if (acpi_bay_match(handle))
1288                         acpi_add_id(pnp, ACPI_BAY_HID);
1289                 else if (acpi_dock_match(handle))
1290                         acpi_add_id(pnp, ACPI_DOCK_HID);
1291                 else if (acpi_ibm_smbus_match(handle))
1292                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1293                 else if (list_empty(&pnp->ids) &&
1294                          acpi_object_is_system_bus(handle)) {
1295                         /* \_SB, \_TZ, LNXSYBUS */
1296                         acpi_add_id(pnp, ACPI_BUS_HID);
1297                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1298                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1299                 }
1300
1301                 break;
1302         case ACPI_BUS_TYPE_POWER:
1303                 acpi_add_id(pnp, ACPI_POWER_HID);
1304                 break;
1305         case ACPI_BUS_TYPE_PROCESSOR:
1306                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1307                 break;
1308         case ACPI_BUS_TYPE_THERMAL:
1309                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1310                 break;
1311         case ACPI_BUS_TYPE_POWER_BUTTON:
1312                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1313                 break;
1314         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1315                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1316                 break;
1317         }
1318 }
1319
1320 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1321 {
1322         struct acpi_hardware_id *id, *tmp;
1323
1324         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1325                 kfree(id->id);
1326                 kfree(id);
1327         }
1328         kfree(pnp->unique_id);
1329 }
1330
1331 static void acpi_init_coherency(struct acpi_device *adev)
1332 {
1333         unsigned long long cca = 0;
1334         acpi_status status;
1335         struct acpi_device *parent = adev->parent;
1336
1337         if (parent && parent->flags.cca_seen) {
1338                 /*
1339                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1340                  * already saw one.
1341                  */
1342                 adev->flags.cca_seen = 1;
1343                 cca = parent->flags.coherent_dma;
1344         } else {
1345                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1346                                                NULL, &cca);
1347                 if (ACPI_SUCCESS(status))
1348                         adev->flags.cca_seen = 1;
1349                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1350                         /*
1351                          * If architecture does not specify that _CCA is
1352                          * required for DMA-able devices (e.g. x86),
1353                          * we default to _CCA=1.
1354                          */
1355                         cca = 1;
1356                 else
1357                         acpi_handle_debug(adev->handle,
1358                                           "ACPI device is missing _CCA.\n");
1359         }
1360
1361         adev->flags.coherent_dma = cca;
1362 }
1363
1364 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1365                              int type, unsigned long long sta)
1366 {
1367         INIT_LIST_HEAD(&device->pnp.ids);
1368         device->device_type = type;
1369         device->handle = handle;
1370         device->parent = acpi_bus_get_parent(handle);
1371         device->fwnode.type = FWNODE_ACPI;
1372         acpi_set_device_status(device, sta);
1373         acpi_device_get_busid(device);
1374         acpi_set_pnp_ids(handle, &device->pnp, type);
1375         acpi_init_properties(device);
1376         acpi_bus_get_flags(device);
1377         device->flags.match_driver = false;
1378         device->flags.initialized = true;
1379         device->flags.visited = false;
1380         device_initialize(&device->dev);
1381         dev_set_uevent_suppress(&device->dev, true);
1382         acpi_init_coherency(device);
1383 }
1384
1385 void acpi_device_add_finalize(struct acpi_device *device)
1386 {
1387         dev_set_uevent_suppress(&device->dev, false);
1388         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1389 }
1390
1391 static int acpi_add_single_object(struct acpi_device **child,
1392                                   acpi_handle handle, int type,
1393                                   unsigned long long sta)
1394 {
1395         int result;
1396         struct acpi_device *device;
1397         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1398
1399         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1400         if (!device) {
1401                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1402                 return -ENOMEM;
1403         }
1404
1405         acpi_init_device_object(device, handle, type, sta);
1406         acpi_bus_get_power_flags(device);
1407         acpi_bus_get_wakeup_device_flags(device);
1408
1409         result = acpi_device_add(device, acpi_device_release);
1410         if (result) {
1411                 acpi_device_release(&device->dev);
1412                 return result;
1413         }
1414
1415         acpi_power_add_remove_device(device, true);
1416         acpi_device_add_finalize(device);
1417         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1418         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1419                 dev_name(&device->dev), (char *) buffer.pointer,
1420                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1421         kfree(buffer.pointer);
1422         *child = device;
1423         return 0;
1424 }
1425
1426 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1427                                     unsigned long long *sta)
1428 {
1429         acpi_status status;
1430         acpi_object_type acpi_type;
1431
1432         status = acpi_get_type(handle, &acpi_type);
1433         if (ACPI_FAILURE(status))
1434                 return -ENODEV;
1435
1436         switch (acpi_type) {
1437         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1438         case ACPI_TYPE_DEVICE:
1439                 *type = ACPI_BUS_TYPE_DEVICE;
1440                 status = acpi_bus_get_status_handle(handle, sta);
1441                 if (ACPI_FAILURE(status))
1442                         return -ENODEV;
1443                 break;
1444         case ACPI_TYPE_PROCESSOR:
1445                 *type = ACPI_BUS_TYPE_PROCESSOR;
1446                 status = acpi_bus_get_status_handle(handle, sta);
1447                 if (ACPI_FAILURE(status))
1448                         return -ENODEV;
1449                 break;
1450         case ACPI_TYPE_THERMAL:
1451                 *type = ACPI_BUS_TYPE_THERMAL;
1452                 *sta = ACPI_STA_DEFAULT;
1453                 break;
1454         case ACPI_TYPE_POWER:
1455                 *type = ACPI_BUS_TYPE_POWER;
1456                 *sta = ACPI_STA_DEFAULT;
1457                 break;
1458         default:
1459                 return -ENODEV;
1460         }
1461
1462         return 0;
1463 }
1464
1465 bool acpi_device_is_present(struct acpi_device *adev)
1466 {
1467         if (adev->status.present || adev->status.functional)
1468                 return true;
1469
1470         adev->flags.initialized = false;
1471         return false;
1472 }
1473
1474 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1475                                        char *idstr,
1476                                        const struct acpi_device_id **matchid)
1477 {
1478         const struct acpi_device_id *devid;
1479
1480         if (handler->match)
1481                 return handler->match(idstr, matchid);
1482
1483         for (devid = handler->ids; devid->id[0]; devid++)
1484                 if (!strcmp((char *)devid->id, idstr)) {
1485                         if (matchid)
1486                                 *matchid = devid;
1487
1488                         return true;
1489                 }
1490
1491         return false;
1492 }
1493
1494 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1495                                         const struct acpi_device_id **matchid)
1496 {
1497         struct acpi_scan_handler *handler;
1498
1499         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1500                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1501                         return handler;
1502
1503         return NULL;
1504 }
1505
1506 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1507 {
1508         if (!!hotplug->enabled == !!val)
1509                 return;
1510
1511         mutex_lock(&acpi_scan_lock);
1512
1513         hotplug->enabled = val;
1514
1515         mutex_unlock(&acpi_scan_lock);
1516 }
1517
1518 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1519 {
1520         struct acpi_hardware_id *hwid;
1521
1522         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1523                 acpi_dock_add(adev);
1524                 return;
1525         }
1526         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1527                 struct acpi_scan_handler *handler;
1528
1529                 handler = acpi_scan_match_handler(hwid->id, NULL);
1530                 if (handler) {
1531                         adev->flags.hotplug_notify = true;
1532                         break;
1533                 }
1534         }
1535 }
1536
1537 static void acpi_device_dep_initialize(struct acpi_device *adev)
1538 {
1539         struct acpi_dep_data *dep;
1540         struct acpi_handle_list dep_devices;
1541         acpi_status status;
1542         int i;
1543
1544         if (!acpi_has_method(adev->handle, "_DEP"))
1545                 return;
1546
1547         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1548                                         &dep_devices);
1549         if (ACPI_FAILURE(status)) {
1550                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1551                 return;
1552         }
1553
1554         for (i = 0; i < dep_devices.count; i++) {
1555                 struct acpi_device_info *info;
1556                 int skip;
1557
1558                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1559                 if (ACPI_FAILURE(status)) {
1560                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1561                         continue;
1562                 }
1563
1564                 /*
1565                  * Skip the dependency of Windows System Power
1566                  * Management Controller
1567                  */
1568                 skip = info->valid & ACPI_VALID_HID &&
1569                         !strcmp(info->hardware_id.string, "INT3396");
1570
1571                 kfree(info);
1572
1573                 if (skip)
1574                         continue;
1575
1576                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1577                 if (!dep)
1578                         return;
1579
1580                 dep->master = dep_devices.handles[i];
1581                 dep->slave  = adev->handle;
1582                 adev->dep_unmet++;
1583
1584                 mutex_lock(&acpi_dep_list_lock);
1585                 list_add_tail(&dep->node , &acpi_dep_list);
1586                 mutex_unlock(&acpi_dep_list_lock);
1587         }
1588 }
1589
1590 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1591                                       void *not_used, void **return_value)
1592 {
1593         struct acpi_device *device = NULL;
1594         int type;
1595         unsigned long long sta;
1596         int result;
1597
1598         acpi_bus_get_device(handle, &device);
1599         if (device)
1600                 goto out;
1601
1602         result = acpi_bus_type_and_status(handle, &type, &sta);
1603         if (result)
1604                 return AE_OK;
1605
1606         if (type == ACPI_BUS_TYPE_POWER) {
1607                 acpi_add_power_resource(handle);
1608                 return AE_OK;
1609         }
1610
1611         acpi_add_single_object(&device, handle, type, sta);
1612         if (!device)
1613                 return AE_CTRL_DEPTH;
1614
1615         acpi_scan_init_hotplug(device);
1616         acpi_device_dep_initialize(device);
1617
1618  out:
1619         if (!*return_value)
1620                 *return_value = device;
1621
1622         return AE_OK;
1623 }
1624
1625 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
1626 {
1627         bool *is_spi_i2c_slave_p = data;
1628
1629         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1630                 return 1;
1631
1632         /*
1633          * devices that are connected to UART still need to be enumerated to
1634          * platform bus
1635          */
1636         if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
1637                 *is_spi_i2c_slave_p = true;
1638
1639          /* no need to do more checking */
1640         return -1;
1641 }
1642
1643 static void acpi_default_enumeration(struct acpi_device *device)
1644 {
1645         struct list_head resource_list;
1646         bool is_spi_i2c_slave = false;
1647
1648         /*
1649          * Do not enemerate SPI/I2C slaves as they will be enuerated by their
1650          * respective parents.
1651          */
1652         INIT_LIST_HEAD(&resource_list);
1653         acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
1654                                &is_spi_i2c_slave);
1655         acpi_dev_free_resource_list(&resource_list);
1656         if (!is_spi_i2c_slave)
1657                 acpi_create_platform_device(device);
1658 }
1659
1660 static const struct acpi_device_id generic_device_ids[] = {
1661         {ACPI_DT_NAMESPACE_HID, },
1662         {"", },
1663 };
1664
1665 static int acpi_generic_device_attach(struct acpi_device *adev,
1666                                       const struct acpi_device_id *not_used)
1667 {
1668         /*
1669          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1670          * below can be unconditional.
1671          */
1672         if (adev->data.of_compatible)
1673                 acpi_default_enumeration(adev);
1674
1675         return 1;
1676 }
1677
1678 static struct acpi_scan_handler generic_device_handler = {
1679         .ids = generic_device_ids,
1680         .attach = acpi_generic_device_attach,
1681 };
1682
1683 static int acpi_scan_attach_handler(struct acpi_device *device)
1684 {
1685         struct acpi_hardware_id *hwid;
1686         int ret = 0;
1687
1688         list_for_each_entry(hwid, &device->pnp.ids, list) {
1689                 const struct acpi_device_id *devid;
1690                 struct acpi_scan_handler *handler;
1691
1692                 handler = acpi_scan_match_handler(hwid->id, &devid);
1693                 if (handler) {
1694                         if (!handler->attach) {
1695                                 device->pnp.type.platform_id = 0;
1696                                 continue;
1697                         }
1698                         device->handler = handler;
1699                         ret = handler->attach(device, devid);
1700                         if (ret > 0)
1701                                 break;
1702
1703                         device->handler = NULL;
1704                         if (ret < 0)
1705                                 break;
1706                 }
1707         }
1708
1709         return ret;
1710 }
1711
1712 static void acpi_bus_attach(struct acpi_device *device)
1713 {
1714         struct acpi_device *child;
1715         acpi_handle ejd;
1716         int ret;
1717
1718         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1719                 register_dock_dependent_device(device, ejd);
1720
1721         acpi_bus_get_status(device);
1722         /* Skip devices that are not present. */
1723         if (!acpi_device_is_present(device)) {
1724                 device->flags.visited = false;
1725                 device->flags.power_manageable = 0;
1726                 return;
1727         }
1728         if (device->handler)
1729                 goto ok;
1730
1731         if (!device->flags.initialized) {
1732                 device->flags.power_manageable =
1733                         device->power.states[ACPI_STATE_D0].flags.valid;
1734                 if (acpi_bus_init_power(device))
1735                         device->flags.power_manageable = 0;
1736
1737                 device->flags.initialized = true;
1738         }
1739         device->flags.visited = false;
1740         ret = acpi_scan_attach_handler(device);
1741         if (ret < 0)
1742                 return;
1743
1744         device->flags.match_driver = true;
1745         if (!ret) {
1746                 ret = device_attach(&device->dev);
1747                 if (ret < 0)
1748                         return;
1749
1750                 if (!ret && device->pnp.type.platform_id)
1751                         acpi_default_enumeration(device);
1752         }
1753         device->flags.visited = true;
1754
1755  ok:
1756         list_for_each_entry(child, &device->children, node)
1757                 acpi_bus_attach(child);
1758
1759         if (device->handler && device->handler->hotplug.notify_online)
1760                 device->handler->hotplug.notify_online(device);
1761 }
1762
1763 void acpi_walk_dep_device_list(acpi_handle handle)
1764 {
1765         struct acpi_dep_data *dep, *tmp;
1766         struct acpi_device *adev;
1767
1768         mutex_lock(&acpi_dep_list_lock);
1769         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
1770                 if (dep->master == handle) {
1771                         acpi_bus_get_device(dep->slave, &adev);
1772                         if (!adev)
1773                                 continue;
1774
1775                         adev->dep_unmet--;
1776                         if (!adev->dep_unmet)
1777                                 acpi_bus_attach(adev);
1778                         list_del(&dep->node);
1779                         kfree(dep);
1780                 }
1781         }
1782         mutex_unlock(&acpi_dep_list_lock);
1783 }
1784 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
1785
1786 /**
1787  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1788  * @handle: Root of the namespace scope to scan.
1789  *
1790  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1791  * found devices.
1792  *
1793  * If no devices were found, -ENODEV is returned, but it does not mean that
1794  * there has been a real error.  There just have been no suitable ACPI objects
1795  * in the table trunk from which the kernel could create a device and add an
1796  * appropriate driver.
1797  *
1798  * Must be called under acpi_scan_lock.
1799  */
1800 int acpi_bus_scan(acpi_handle handle)
1801 {
1802         void *device = NULL;
1803
1804         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1805                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1806                                     acpi_bus_check_add, NULL, NULL, &device);
1807
1808         if (device) {
1809                 acpi_bus_attach(device);
1810                 return 0;
1811         }
1812         return -ENODEV;
1813 }
1814 EXPORT_SYMBOL(acpi_bus_scan);
1815
1816 /**
1817  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
1818  * @adev: Root of the ACPI namespace scope to walk.
1819  *
1820  * Must be called under acpi_scan_lock.
1821  */
1822 void acpi_bus_trim(struct acpi_device *adev)
1823 {
1824         struct acpi_scan_handler *handler = adev->handler;
1825         struct acpi_device *child;
1826
1827         list_for_each_entry_reverse(child, &adev->children, node)
1828                 acpi_bus_trim(child);
1829
1830         adev->flags.match_driver = false;
1831         if (handler) {
1832                 if (handler->detach)
1833                         handler->detach(adev);
1834
1835                 adev->handler = NULL;
1836         } else {
1837                 device_release_driver(&adev->dev);
1838         }
1839         /*
1840          * Most likely, the device is going away, so put it into D3cold before
1841          * that.
1842          */
1843         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
1844         adev->flags.initialized = false;
1845         adev->flags.visited = false;
1846 }
1847 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1848
1849 static int acpi_bus_scan_fixed(void)
1850 {
1851         int result = 0;
1852
1853         /*
1854          * Enumerate all fixed-feature devices.
1855          */
1856         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1857                 struct acpi_device *device = NULL;
1858
1859                 result = acpi_add_single_object(&device, NULL,
1860                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1861                                                 ACPI_STA_DEFAULT);
1862                 if (result)
1863                         return result;
1864
1865                 device->flags.match_driver = true;
1866                 result = device_attach(&device->dev);
1867                 if (result < 0)
1868                         return result;
1869
1870                 device_init_wakeup(&device->dev, true);
1871         }
1872
1873         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1874                 struct acpi_device *device = NULL;
1875
1876                 result = acpi_add_single_object(&device, NULL,
1877                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1878                                                 ACPI_STA_DEFAULT);
1879                 if (result)
1880                         return result;
1881
1882                 device->flags.match_driver = true;
1883                 result = device_attach(&device->dev);
1884         }
1885
1886         return result < 0 ? result : 0;
1887 }
1888
1889 int __init acpi_scan_init(void)
1890 {
1891         int result;
1892
1893         acpi_pci_root_init();
1894         acpi_pci_link_init();
1895         acpi_processor_init();
1896         acpi_lpss_init();
1897         acpi_apd_init();
1898         acpi_cmos_rtc_init();
1899         acpi_container_init();
1900         acpi_memory_hotplug_init();
1901         acpi_pnp_init();
1902         acpi_int340x_thermal_init();
1903
1904         acpi_scan_add_handler(&generic_device_handler);
1905
1906         mutex_lock(&acpi_scan_lock);
1907         /*
1908          * Enumerate devices in the ACPI namespace.
1909          */
1910         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1911         if (result)
1912                 goto out;
1913
1914         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1915         if (result)
1916                 goto out;
1917
1918         /* Fixed feature devices do not exist on HW-reduced platform */
1919         if (!acpi_gbl_reduced_hardware) {
1920                 result = acpi_bus_scan_fixed();
1921                 if (result) {
1922                         acpi_detach_data(acpi_root->handle,
1923                                          acpi_scan_drop_device);
1924                         acpi_device_del(acpi_root);
1925                         put_device(&acpi_root->dev);
1926                         goto out;
1927                 }
1928         }
1929
1930         acpi_update_all_gpes();
1931
1932  out:
1933         mutex_unlock(&acpi_scan_lock);
1934         return result;
1935 }