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         *device = NULL;
 568
 569         status = acpi_get_data_full(handle, acpi_scan_drop_device,
 570                                     (void **)device, callback);
 571         if (ACPI_FAILURE(status) || !*device) {
 572                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 573                                   handle));
 574                 return -ENODEV;
 575         }
 576         return 0;
 577 }
 578
 579 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 580 {
 581         return acpi_get_device_data(handle, device, NULL);
 582 }
 583 EXPORT_SYMBOL(acpi_bus_get_device);
 584
 585 static void get_acpi_device(void *dev)
 586 {
 587         if (dev)
 588                 get_device(&((struct acpi_device *)dev)->dev);
 589 }
 590
 591 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 592 {
 593         struct acpi_device *adev = NULL;
 594
 595         acpi_get_device_data(handle, &adev, get_acpi_device);
 596         return adev;
 597 }
 598
 599 void acpi_bus_put_acpi_device(struct acpi_device *adev)
 600 {
 601         put_device(&adev->dev);
 602 }
 603
 604 int acpi_device_add(struct acpi_device *device,
 605                     void (*release)(struct device *))
 606 {
 607         int result;
 608         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 609         int found = 0;
 610
 611         if (device->handle) {
 612                 acpi_status status;
 613
 614                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
 615                                           device);
 616                 if (ACPI_FAILURE(status)) {
 617                         acpi_handle_err(device->handle,
 618                                         "Unable to attach device data\n");
 619                         return -ENODEV;
 620                 }
 621         }
 622
 623         /*
 624          * Linkage
 625          * -------
 626          * Link this device to its parent and siblings.
 627          */
 628         INIT_LIST_HEAD(&device->children);
 629         INIT_LIST_HEAD(&device->node);
 630         INIT_LIST_HEAD(&device->wakeup_list);
 631         INIT_LIST_HEAD(&device->physical_node_list);
 632         INIT_LIST_HEAD(&device->del_list);
 633         mutex_init(&device->physical_node_lock);
 634
 635         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 636         if (!new_bus_id) {
 637                 pr_err(PREFIX "Memory allocation error\n");
 638                 result = -ENOMEM;
 639                 goto err_detach;
 640         }
 641
 642         mutex_lock(&acpi_device_lock);
 643         /*
 644          * Find suitable bus_id and instance number in acpi_bus_id_list
 645          * If failed, create one and link it into acpi_bus_id_list
 646          */
 647         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 648                 if (!strcmp(acpi_device_bus_id->bus_id,
 649                             acpi_device_hid(device))) {
 650                         acpi_device_bus_id->instance_no++;
 651                         found = 1;
 652                         kfree(new_bus_id);
 653                         break;
 654                 }
 655         }
 656         if (!found) {
 657                 acpi_device_bus_id = new_bus_id;
 658                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 659                 acpi_device_bus_id->instance_no = 0;
 660                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 661         }
 662         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 663
 664         if (device->parent)
 665                 list_add_tail(&device->node, &device->parent->children);
 666
 667         if (device->wakeup.flags.valid)
 668                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 669         mutex_unlock(&acpi_device_lock);
 670
 671         if (device->parent)
 672                 device->dev.parent = &device->parent->dev;
 673         device->dev.bus = &acpi_bus_type;
 674         device->dev.release = release;
 675         result = device_add(&device->dev);
 676         if (result) {
 677                 dev_err(&device->dev, "Error registering device\n");
 678                 goto err;
 679         }
 680
 681         result = acpi_device_setup_files(device);
 682         if (result)
 683                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 684                        dev_name(&device->dev));
 685
 686         return 0;
 687
 688  err:
 689         mutex_lock(&acpi_device_lock);
 690         if (device->parent)
 691                 list_del(&device->node);
 692         list_del(&device->wakeup_list);
 693         mutex_unlock(&acpi_device_lock);
 694
 695  err_detach:
 696         acpi_detach_data(device->handle, acpi_scan_drop_device);
 697         return result;
 698 }
 699
 700 /* --------------------------------------------------------------------------
 701                                  Device Enumeration
 702    -------------------------------------------------------------------------- */
 703 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 704 {
 705         struct acpi_device *device = NULL;
 706         acpi_status status;
 707
 708         /*
 709          * Fixed hardware devices do not appear in the namespace and do not
 710          * have handles, but we fabricate acpi_devices for them, so we have
 711          * to deal with them specially.
 712          */
 713         if (!handle)
 714                 return acpi_root;
 715
 716         do {
 717                 status = acpi_get_parent(handle, &handle);
 718                 if (ACPI_FAILURE(status))
 719                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 720         } while (acpi_bus_get_device(handle, &device));
 721         return device;
 722 }
 723
 724 acpi_status
 725 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 726 {
 727         acpi_status status;
 728         acpi_handle tmp;
 729         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 730         union acpi_object *obj;
 731
 732         status = acpi_get_handle(handle, "_EJD", &tmp);
 733         if (ACPI_FAILURE(status))
 734                 return status;
 735
 736         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 737         if (ACPI_SUCCESS(status)) {
 738                 obj = buffer.pointer;
 739                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 740                                          ejd);
 741                 kfree(buffer.pointer);
 742         }
 743         return status;
 744 }
 745 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 746
 747 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 748                                         struct acpi_device_wakeup *wakeup)
 749 {
 750         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 751         union acpi_object *package = NULL;
 752         union acpi_object *element = NULL;
 753         acpi_status status;
 754         int err = -ENODATA;
 755
 756         if (!wakeup)
 757                 return -EINVAL;
 758
 759         INIT_LIST_HEAD(&wakeup->resources);
 760
 761         /* _PRW */
 762         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 763         if (ACPI_FAILURE(status)) {
 764                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 765                 return err;
 766         }
 767
 768         package = (union acpi_object *)buffer.pointer;
 769
 770         if (!package || package->package.count < 2)
 771                 goto out;
 772
 773         element = &(package->package.elements[0]);
 774         if (!element)
 775                 goto out;
 776
 777         if (element->type == ACPI_TYPE_PACKAGE) {
 778                 if ((element->package.count < 2) ||
 779                     (element->package.elements[0].type !=
 780                      ACPI_TYPE_LOCAL_REFERENCE)
 781                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 782                         goto out;
 783
 784                 wakeup->gpe_device =
 785                     element->package.elements[0].reference.handle;
 786                 wakeup->gpe_number =
 787                     (u32) element->package.elements[1].integer.value;
 788         } else if (element->type == ACPI_TYPE_INTEGER) {
 789                 wakeup->gpe_device = NULL;
 790                 wakeup->gpe_number = element->integer.value;
 791         } else {
 792                 goto out;
 793         }
 794
 795         element = &(package->package.elements[1]);
 796         if (element->type != ACPI_TYPE_INTEGER)
 797                 goto out;
 798
 799         wakeup->sleep_state = element->integer.value;
 800
 801         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 802         if (err)
 803                 goto out;
 804
 805         if (!list_empty(&wakeup->resources)) {
 806                 int sleep_state;
 807
 808                 err = acpi_power_wakeup_list_init(&wakeup->resources,
 809                                                   &sleep_state);
 810                 if (err) {
 811                         acpi_handle_warn(handle, "Retrieving current states "
 812                                          "of wakeup power resources failed\n");
 813                         acpi_power_resources_list_free(&wakeup->resources);
 814                         goto out;
 815                 }
 816                 if (sleep_state < wakeup->sleep_state) {
 817                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
 818                                          "(S%d) by S%d from power resources\n",
 819                                          (int)wakeup->sleep_state, sleep_state);
 820                         wakeup->sleep_state = sleep_state;
 821                 }
 822         }
 823
 824  out:
 825         kfree(buffer.pointer);
 826         return err;
 827 }
 828
 829 static void acpi_wakeup_gpe_init(struct acpi_device *device)
 830 {
 831         static const struct acpi_device_id button_device_ids[] = {
 832                 {"PNP0C0C", 0},
 833                 {"PNP0C0D", 0},
 834                 {"PNP0C0E", 0},
 835                 {"", 0},
 836         };
 837         struct acpi_device_wakeup *wakeup = &device->wakeup;
 838         acpi_status status;
 839         acpi_event_status event_status;
 840
 841         wakeup->flags.notifier_present = 0;
 842
 843         /* Power button, Lid switch always enable wakeup */
 844         if (!acpi_match_device_ids(device, button_device_ids)) {
 845                 wakeup->flags.run_wake = 1;
 846                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 847                         /* Do not use Lid/sleep button for S5 wakeup */
 848                         if (wakeup->sleep_state == ACPI_STATE_S5)
 849                                 wakeup->sleep_state = ACPI_STATE_S4;
 850                 }
 851                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 852                 device_set_wakeup_capable(&device->dev, true);
 853                 return;
 854         }
 855
 856         acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 857                                 wakeup->gpe_number);
 858         status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
 859                                      &event_status);
 860         if (ACPI_FAILURE(status))
 861                 return;
 862
 863         wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
 864 }
 865
 866 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 867 {
 868         int err;
 869
 870         /* Presence of _PRW indicates wake capable */
 871         if (!acpi_has_method(device->handle, "_PRW"))
 872                 return;
 873
 874         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
 875                                                            &device->wakeup);
 876         if (err) {
 877                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
 878                 return;
 879         }
 880
 881         device->wakeup.flags.valid = 1;
 882         device->wakeup.prepare_count = 0;
 883         acpi_wakeup_gpe_init(device);
 884         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 885          * system for the ACPI device with the _PRW object.
 886          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 887          * So it is necessary to call _DSW object first. Only when it is not
 888          * present will the _PSW object used.
 889          */
 890         err = acpi_device_sleep_wake(device, 0, 0, 0);
 891         if (err)
 892                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 893                                 "error in _DSW or _PSW evaluation\n"));
 894 }
 895
 896 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 897 {
 898         struct acpi_device_power_state *ps = &device->power.states[state];
 899         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 900         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 901         acpi_status status;
 902
 903         INIT_LIST_HEAD(&ps->resources);
 904
 905         /* Evaluate "_PRx" to get referenced power resources */
 906         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 907         if (ACPI_SUCCESS(status)) {
 908                 union acpi_object *package = buffer.pointer;
 909
 910                 if (buffer.length && package
 911                     && package->type == ACPI_TYPE_PACKAGE
 912                     && package->package.count)
 913                         acpi_extract_power_resources(package, 0, &ps->resources);
 914
 915                 ACPI_FREE(buffer.pointer);
 916         }
 917
 918         /* Evaluate "_PSx" to see if we can do explicit sets */
 919         pathname[2] = 'S';
 920         if (acpi_has_method(device->handle, pathname))
 921                 ps->flags.explicit_set = 1;
 922
 923         /* State is valid if there are means to put the device into it. */
 924         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
 925                 ps->flags.valid = 1;
 926
 927         ps->power = -1;         /* Unknown - driver assigned */
 928         ps->latency = -1;       /* Unknown - driver assigned */
 929 }
 930
 931 static void acpi_bus_get_power_flags(struct acpi_device *device)
 932 {
 933         u32 i;
 934
 935         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 936         if (!acpi_has_method(device->handle, "_PS0") &&
 937             !acpi_has_method(device->handle, "_PR0"))
 938                 return;
 939
 940         device->flags.power_manageable = 1;
 941
 942         /*
 943          * Power Management Flags
 944          */
 945         if (acpi_has_method(device->handle, "_PSC"))
 946                 device->power.flags.explicit_get = 1;
 947
 948         if (acpi_has_method(device->handle, "_IRC"))
 949                 device->power.flags.inrush_current = 1;
 950
 951         if (acpi_has_method(device->handle, "_DSW"))
 952                 device->power.flags.dsw_present = 1;
 953
 954         /*
 955          * Enumerate supported power management states
 956          */
 957         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
 958                 acpi_bus_init_power_state(device, i);
 959
 960         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
 961
 962         /* Set the defaults for D0 and D3hot (always supported). */
 963         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 964         device->power.states[ACPI_STATE_D0].power = 100;
 965         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
 966
 967         /*
 968          * Use power resources only if the D0 list of them is populated, because
 969          * some platforms may provide _PR3 only to indicate D3cold support and
 970          * in those cases the power resources list returned by it may be bogus.
 971          */
 972         if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
 973                 device->power.flags.power_resources = 1;
 974                 /*
 975                  * D3cold is supported if the D3hot list of power resources is
 976                  * not empty.
 977                  */
 978                 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
 979                         device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
 980         }
 981
 982         if (acpi_bus_init_power(device))
 983                 device->flags.power_manageable = 0;
 984 }
 985
 986 static void acpi_bus_get_flags(struct acpi_device *device)
 987 {
 988         /* Presence of _STA indicates 'dynamic_status' */
 989         if (acpi_has_method(device->handle, "_STA"))
 990                 device->flags.dynamic_status = 1;
 991
 992         /* Presence of _RMV indicates 'removable' */
 993         if (acpi_has_method(device->handle, "_RMV"))
 994                 device->flags.removable = 1;
 995
 996         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 997         if (acpi_has_method(device->handle, "_EJD") ||
 998             acpi_has_method(device->handle, "_EJ0"))
 999                 device->flags.ejectable = 1;
1000 }
1001
1002 static void acpi_device_get_busid(struct acpi_device *device)
1003 {
1004         char bus_id[5] = { '?', 0 };
1005         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1006         int i = 0;
1007
1008         /*
1009          * Bus ID
1010          * ------
1011          * The device's Bus ID is simply the object name.
1012          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1013          */
1014         if (ACPI_IS_ROOT_DEVICE(device)) {
1015                 strcpy(device->pnp.bus_id, "ACPI");
1016                 return;
1017         }
1018
1019         switch (device->device_type) {
1020         case ACPI_BUS_TYPE_POWER_BUTTON:
1021                 strcpy(device->pnp.bus_id, "PWRF");
1022                 break;
1023         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1024                 strcpy(device->pnp.bus_id, "SLPF");
1025                 break;
1026         default:
1027                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1028                 /* Clean up trailing underscores (if any) */
1029                 for (i = 3; i > 1; i--) {
1030                         if (bus_id[i] == '_')
1031                                 bus_id[i] = '\0';
1032                         else
1033                                 break;
1034                 }
1035                 strcpy(device->pnp.bus_id, bus_id);
1036                 break;
1037         }
1038 }
1039
1040 /*
1041  * acpi_ata_match - see if an acpi object is an ATA device
1042  *
1043  * If an acpi object has one of the ACPI ATA methods defined,
1044  * then we can safely call it an ATA device.
1045  */
1046 bool acpi_ata_match(acpi_handle handle)
1047 {
1048         return acpi_has_method(handle, "_GTF") ||
1049                acpi_has_method(handle, "_GTM") ||
1050                acpi_has_method(handle, "_STM") ||
1051                acpi_has_method(handle, "_SDD");
1052 }
1053
1054 /*
1055  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1056  *
1057  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1058  * then we can safely call it an ejectable drive bay
1059  */
1060 bool acpi_bay_match(acpi_handle handle)
1061 {
1062         acpi_handle phandle;
1063
1064         if (!acpi_has_method(handle, "_EJ0"))
1065                 return false;
1066         if (acpi_ata_match(handle))
1067                 return true;
1068         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1069                 return false;
1070
1071         return acpi_ata_match(phandle);
1072 }
1073
1074 bool acpi_device_is_battery(struct acpi_device *adev)
1075 {
1076         struct acpi_hardware_id *hwid;
1077
1078         list_for_each_entry(hwid, &adev->pnp.ids, list)
1079                 if (!strcmp("PNP0C0A", hwid->id))
1080                         return true;
1081
1082         return false;
1083 }
1084
1085 static bool is_ejectable_bay(struct acpi_device *adev)
1086 {
1087         acpi_handle handle = adev->handle;
1088
1089         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1090                 return true;
1091
1092         return acpi_bay_match(handle);
1093 }
1094
1095 /*
1096  * acpi_dock_match - see if an acpi object has a _DCK method
1097  */
1098 bool acpi_dock_match(acpi_handle handle)
1099 {
1100         return acpi_has_method(handle, "_DCK");
1101 }
1102
1103 static acpi_status
1104 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1105                           void **return_value)
1106 {
1107         long *cap = context;
1108
1109         if (acpi_has_method(handle, "_BCM") &&
1110             acpi_has_method(handle, "_BCL")) {
1111                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1112                                   "support\n"));
1113                 *cap |= ACPI_VIDEO_BACKLIGHT;
1114                 if (!acpi_has_method(handle, "_BQC"))
1115                         printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
1116                                 "cannot determine initial brightness\n");
1117                 /* We have backlight support, no need to scan further */
1118                 return AE_CTRL_TERMINATE;
1119         }
1120         return 0;
1121 }
1122
1123 /* Returns true if the ACPI object is a video device which can be
1124  * handled by video.ko.
1125  * The device will get a Linux specific CID added in scan.c to
1126  * identify the device as an ACPI graphics device
1127  * Be aware that the graphics device may not be physically present
1128  * Use acpi_video_get_capabilities() to detect general ACPI video
1129  * capabilities of present cards
1130  */
1131 long acpi_is_video_device(acpi_handle handle)
1132 {
1133         long video_caps = 0;
1134
1135         /* Is this device able to support video switching ? */
1136         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1137                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1138
1139         /* Is this device able to retrieve a video ROM ? */
1140         if (acpi_has_method(handle, "_ROM"))
1141                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1142
1143         /* Is this device able to configure which video head to be POSTed ? */
1144         if (acpi_has_method(handle, "_VPO") &&
1145             acpi_has_method(handle, "_GPD") &&
1146             acpi_has_method(handle, "_SPD"))
1147                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1148
1149         /* Only check for backlight functionality if one of the above hit. */
1150         if (video_caps)
1151                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1152                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1153                                     &video_caps, NULL);
1154
1155         return video_caps;
1156 }
1157 EXPORT_SYMBOL(acpi_is_video_device);
1158
1159 const char *acpi_device_hid(struct acpi_device *device)
1160 {
1161         struct acpi_hardware_id *hid;
1162
1163         if (list_empty(&device->pnp.ids))
1164                 return dummy_hid;
1165
1166         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1167         return hid->id;
1168 }
1169 EXPORT_SYMBOL(acpi_device_hid);
1170
1171 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1172 {
1173         struct acpi_hardware_id *id;
1174
1175         id = kmalloc(sizeof(*id), GFP_KERNEL);
1176         if (!id)
1177                 return;
1178
1179         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1180         if (!id->id) {
1181                 kfree(id);
1182                 return;
1183         }
1184
1185         list_add_tail(&id->list, &pnp->ids);
1186         pnp->type.hardware_id = 1;
1187 }
1188
1189 /*
1190  * Old IBM workstations have a DSDT bug wherein the SMBus object
1191  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1192  * prefix.  Work around this.
1193  */
1194 static bool acpi_ibm_smbus_match(acpi_handle handle)
1195 {
1196         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1197         struct acpi_buffer path = { sizeof(node_name), node_name };
1198
1199         if (!dmi_name_in_vendors("IBM"))
1200                 return false;
1201
1202         /* Look for SMBS object */
1203         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1204             strcmp("SMBS", path.pointer))
1205                 return false;
1206
1207         /* Does it have the necessary (but misnamed) methods? */
1208         if (acpi_has_method(handle, "SBI") &&
1209             acpi_has_method(handle, "SBR") &&
1210             acpi_has_method(handle, "SBW"))
1211                 return true;
1212
1213         return false;
1214 }
1215
1216 static bool acpi_object_is_system_bus(acpi_handle handle)
1217 {
1218         acpi_handle tmp;
1219
1220         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1221             tmp == handle)
1222                 return true;
1223         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1224             tmp == handle)
1225                 return true;
1226
1227         return false;
1228 }
1229
1230 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1231                                 int device_type)
1232 {
1233         acpi_status status;
1234         struct acpi_device_info *info;
1235         struct acpi_pnp_device_id_list *cid_list;
1236         int i;
1237
1238         switch (device_type) {
1239         case ACPI_BUS_TYPE_DEVICE:
1240                 if (handle == ACPI_ROOT_OBJECT) {
1241                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1242                         break;
1243                 }
1244
1245                 status = acpi_get_object_info(handle, &info);
1246                 if (ACPI_FAILURE(status)) {
1247                         pr_err(PREFIX "%s: Error reading device info\n",
1248                                         __func__);
1249                         return;
1250                 }
1251
1252                 if (info->valid & ACPI_VALID_HID) {
1253                         acpi_add_id(pnp, info->hardware_id.string);
1254                         pnp->type.platform_id = 1;
1255                 }
1256                 if (info->valid & ACPI_VALID_CID) {
1257                         cid_list = &info->compatible_id_list;
1258                         for (i = 0; i < cid_list->count; i++)
1259                                 acpi_add_id(pnp, cid_list->ids[i].string);
1260                 }
1261                 if (info->valid & ACPI_VALID_ADR) {
1262                         pnp->bus_address = info->address;
1263                         pnp->type.bus_address = 1;
1264                 }
1265                 if (info->valid & ACPI_VALID_UID)
1266                         pnp->unique_id = kstrdup(info->unique_id.string,
1267                                                         GFP_KERNEL);
1268                 if (info->valid & ACPI_VALID_CLS)
1269                         acpi_add_id(pnp, info->class_code.string);
1270
1271                 kfree(info);
1272
1273                 /*
1274                  * Some devices don't reliably have _HIDs & _CIDs, so add
1275                  * synthetic HIDs to make sure drivers can find them.
1276                  */
1277                 if (acpi_is_video_device(handle))
1278                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1279                 else if (acpi_bay_match(handle))
1280                         acpi_add_id(pnp, ACPI_BAY_HID);
1281                 else if (acpi_dock_match(handle))
1282                         acpi_add_id(pnp, ACPI_DOCK_HID);
1283                 else if (acpi_ibm_smbus_match(handle))
1284                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1285                 else if (list_empty(&pnp->ids) &&
1286                          acpi_object_is_system_bus(handle)) {
1287                         /* \_SB, \_TZ, LNXSYBUS */
1288                         acpi_add_id(pnp, ACPI_BUS_HID);
1289                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1290                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1291                 }
1292
1293                 break;
1294         case ACPI_BUS_TYPE_POWER:
1295                 acpi_add_id(pnp, ACPI_POWER_HID);
1296                 break;
1297         case ACPI_BUS_TYPE_PROCESSOR:
1298                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1299                 break;
1300         case ACPI_BUS_TYPE_THERMAL:
1301                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1302                 break;
1303         case ACPI_BUS_TYPE_POWER_BUTTON:
1304                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1305                 break;
1306         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1307                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1308                 break;
1309         }
1310 }
1311
1312 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1313 {
1314         struct acpi_hardware_id *id, *tmp;
1315
1316         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1317                 kfree_const(id->id);
1318                 kfree(id);
1319         }
1320         kfree(pnp->unique_id);
1321 }
1322
1323 /**
1324  * acpi_dma_supported - Check DMA support for the specified device.
1325  * @adev: The pointer to acpi device
1326  *
1327  * Return false if DMA is not supported. Otherwise, return true
1328  */
1329 bool acpi_dma_supported(struct acpi_device *adev)
1330 {
1331         if (!adev)
1332                 return false;
1333
1334         if (adev->flags.cca_seen)
1335                 return true;
1336
1337         /*
1338         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1339         * DMA on "Intel platforms".  Presumably that includes all x86 and
1340         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1341         */
1342         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1343                 return true;
1344
1345         return false;
1346 }
1347
1348 /**
1349  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1350  * @adev: The pointer to acpi device
1351  *
1352  * Return enum dev_dma_attr.
1353  */
1354 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1355 {
1356         if (!acpi_dma_supported(adev))
1357                 return DEV_DMA_NOT_SUPPORTED;
1358
1359         if (adev->flags.coherent_dma)
1360                 return DEV_DMA_COHERENT;
1361         else
1362                 return DEV_DMA_NON_COHERENT;
1363 }
1364
1365 static void acpi_init_coherency(struct acpi_device *adev)
1366 {
1367         unsigned long long cca = 0;
1368         acpi_status status;
1369         struct acpi_device *parent = adev->parent;
1370
1371         if (parent && parent->flags.cca_seen) {
1372                 /*
1373                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1374                  * already saw one.
1375                  */
1376                 adev->flags.cca_seen = 1;
1377                 cca = parent->flags.coherent_dma;
1378         } else {
1379                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1380                                                NULL, &cca);
1381                 if (ACPI_SUCCESS(status))
1382                         adev->flags.cca_seen = 1;
1383                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1384                         /*
1385                          * If architecture does not specify that _CCA is
1386                          * required for DMA-able devices (e.g. x86),
1387                          * we default to _CCA=1.
1388                          */
1389                         cca = 1;
1390                 else
1391                         acpi_handle_debug(adev->handle,
1392                                           "ACPI device is missing _CCA.\n");
1393         }
1394
1395         adev->flags.coherent_dma = cca;
1396 }
1397
1398 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1399                              int type, unsigned long long sta)
1400 {
1401         INIT_LIST_HEAD(&device->pnp.ids);
1402         device->device_type = type;
1403         device->handle = handle;
1404         device->parent = acpi_bus_get_parent(handle);
1405         device->fwnode.type = FWNODE_ACPI;
1406         acpi_set_device_status(device, sta);
1407         acpi_device_get_busid(device);
1408         acpi_set_pnp_ids(handle, &device->pnp, type);
1409         acpi_init_properties(device);
1410         acpi_bus_get_flags(device);
1411         device->flags.match_driver = false;
1412         device->flags.initialized = true;
1413         device->flags.visited = false;
1414         device_initialize(&device->dev);
1415         dev_set_uevent_suppress(&device->dev, true);
1416         acpi_init_coherency(device);
1417 }
1418
1419 void acpi_device_add_finalize(struct acpi_device *device)
1420 {
1421         dev_set_uevent_suppress(&device->dev, false);
1422         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1423 }
1424
1425 static int acpi_add_single_object(struct acpi_device **child,
1426                                   acpi_handle handle, int type,
1427                                   unsigned long long sta)
1428 {
1429         int result;
1430         struct acpi_device *device;
1431         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1432
1433         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1434         if (!device) {
1435                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1436                 return -ENOMEM;
1437         }
1438
1439         acpi_init_device_object(device, handle, type, sta);
1440         acpi_bus_get_power_flags(device);
1441         acpi_bus_get_wakeup_device_flags(device);
1442
1443         result = acpi_device_add(device, acpi_device_release);
1444         if (result) {
1445                 acpi_device_release(&device->dev);
1446                 return result;
1447         }
1448
1449         acpi_power_add_remove_device(device, true);
1450         acpi_device_add_finalize(device);
1451         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1452         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1453                 dev_name(&device->dev), (char *) buffer.pointer,
1454                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1455         kfree(buffer.pointer);
1456         *child = device;
1457         return 0;
1458 }
1459
1460 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1461                                     unsigned long long *sta)
1462 {
1463         acpi_status status;
1464         acpi_object_type acpi_type;
1465
1466         status = acpi_get_type(handle, &acpi_type);
1467         if (ACPI_FAILURE(status))
1468                 return -ENODEV;
1469
1470         switch (acpi_type) {
1471         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1472         case ACPI_TYPE_DEVICE:
1473                 *type = ACPI_BUS_TYPE_DEVICE;
1474                 status = acpi_bus_get_status_handle(handle, sta);
1475                 if (ACPI_FAILURE(status))
1476                         return -ENODEV;
1477                 break;
1478         case ACPI_TYPE_PROCESSOR:
1479                 *type = ACPI_BUS_TYPE_PROCESSOR;
1480                 status = acpi_bus_get_status_handle(handle, sta);
1481                 if (ACPI_FAILURE(status))
1482                         return -ENODEV;
1483                 break;
1484         case ACPI_TYPE_THERMAL:
1485                 *type = ACPI_BUS_TYPE_THERMAL;
1486                 *sta = ACPI_STA_DEFAULT;
1487                 break;
1488         case ACPI_TYPE_POWER:
1489                 *type = ACPI_BUS_TYPE_POWER;
1490                 *sta = ACPI_STA_DEFAULT;
1491                 break;
1492         default:
1493                 return -ENODEV;
1494         }
1495
1496         return 0;
1497 }
1498
1499 bool acpi_device_is_present(struct acpi_device *adev)
1500 {
1501         if (adev->status.present || adev->status.functional)
1502                 return true;
1503
1504         adev->flags.initialized = false;
1505         return false;
1506 }
1507
1508 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1509                                        const char *idstr,
1510                                        const struct acpi_device_id **matchid)
1511 {
1512         const struct acpi_device_id *devid;
1513
1514         if (handler->match)
1515                 return handler->match(idstr, matchid);
1516
1517         for (devid = handler->ids; devid->id[0]; devid++)
1518                 if (!strcmp((char *)devid->id, idstr)) {
1519                         if (matchid)
1520                                 *matchid = devid;
1521
1522                         return true;
1523                 }
1524
1525         return false;
1526 }
1527
1528 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1529                                         const struct acpi_device_id **matchid)
1530 {
1531         struct acpi_scan_handler *handler;
1532
1533         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1534                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1535                         return handler;
1536
1537         return NULL;
1538 }
1539
1540 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1541 {
1542         if (!!hotplug->enabled == !!val)
1543                 return;
1544
1545         mutex_lock(&acpi_scan_lock);
1546
1547         hotplug->enabled = val;
1548
1549         mutex_unlock(&acpi_scan_lock);
1550 }
1551
1552 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1553 {
1554         struct acpi_hardware_id *hwid;
1555
1556         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1557                 acpi_dock_add(adev);
1558                 return;
1559         }
1560         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1561                 struct acpi_scan_handler *handler;
1562
1563                 handler = acpi_scan_match_handler(hwid->id, NULL);
1564                 if (handler) {
1565                         adev->flags.hotplug_notify = true;
1566                         break;
1567                 }
1568         }
1569 }
1570
1571 static void acpi_device_dep_initialize(struct acpi_device *adev)
1572 {
1573         struct acpi_dep_data *dep;
1574         struct acpi_handle_list dep_devices;
1575         acpi_status status;
1576         int i;
1577
1578         if (!acpi_has_method(adev->handle, "_DEP"))
1579                 return;
1580
1581         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1582                                         &dep_devices);
1583         if (ACPI_FAILURE(status)) {
1584                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1585                 return;
1586         }
1587
1588         for (i = 0; i < dep_devices.count; i++) {
1589                 struct acpi_device_info *info;
1590                 int skip;
1591
1592                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1593                 if (ACPI_FAILURE(status)) {
1594                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1595                         continue;
1596                 }
1597
1598                 /*
1599                  * Skip the dependency of Windows System Power
1600                  * Management Controller
1601                  */
1602                 skip = info->valid & ACPI_VALID_HID &&
1603                         !strcmp(info->hardware_id.string, "INT3396");
1604
1605                 kfree(info);
1606
1607                 if (skip)
1608                         continue;
1609
1610                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1611                 if (!dep)
1612                         return;
1613
1614                 dep->master = dep_devices.handles[i];
1615                 dep->slave  = adev->handle;
1616                 adev->dep_unmet++;
1617
1618                 mutex_lock(&acpi_dep_list_lock);
1619                 list_add_tail(&dep->node , &acpi_dep_list);
1620                 mutex_unlock(&acpi_dep_list_lock);
1621         }
1622 }
1623
1624 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1625                                       void *not_used, void **return_value)
1626 {
1627         struct acpi_device *device = NULL;
1628         int type;
1629         unsigned long long sta;
1630         int result;
1631
1632         acpi_bus_get_device(handle, &device);
1633         if (device)
1634                 goto out;
1635
1636         result = acpi_bus_type_and_status(handle, &type, &sta);
1637         if (result)
1638                 return AE_OK;
1639
1640         if (type == ACPI_BUS_TYPE_POWER) {
1641                 acpi_add_power_resource(handle);
1642                 return AE_OK;
1643         }
1644
1645         acpi_add_single_object(&device, handle, type, sta);
1646         if (!device)
1647                 return AE_CTRL_DEPTH;
1648
1649         acpi_scan_init_hotplug(device);
1650         acpi_device_dep_initialize(device);
1651
1652  out:
1653         if (!*return_value)
1654                 *return_value = device;
1655
1656         return AE_OK;
1657 }
1658
1659 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
1660 {
1661         bool *is_spi_i2c_slave_p = data;
1662
1663         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1664                 return 1;
1665
1666         /*
1667          * devices that are connected to UART still need to be enumerated to
1668          * platform bus
1669          */
1670         if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
1671                 *is_spi_i2c_slave_p = true;
1672
1673          /* no need to do more checking */
1674         return -1;
1675 }
1676
1677 static void acpi_default_enumeration(struct acpi_device *device)
1678 {
1679         struct list_head resource_list;
1680         bool is_spi_i2c_slave = false;
1681
1682         /*
1683          * Do not enemerate SPI/I2C slaves as they will be enuerated by their
1684          * respective parents.
1685          */
1686         INIT_LIST_HEAD(&resource_list);
1687         acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
1688                                &is_spi_i2c_slave);
1689         acpi_dev_free_resource_list(&resource_list);
1690         if (!is_spi_i2c_slave)
1691                 acpi_create_platform_device(device);
1692 }
1693
1694 static const struct acpi_device_id generic_device_ids[] = {
1695         {ACPI_DT_NAMESPACE_HID, },
1696         {"", },
1697 };
1698
1699 static int acpi_generic_device_attach(struct acpi_device *adev,
1700                                       const struct acpi_device_id *not_used)
1701 {
1702         /*
1703          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1704          * below can be unconditional.
1705          */
1706         if (adev->data.of_compatible)
1707                 acpi_default_enumeration(adev);
1708
1709         return 1;
1710 }
1711
1712 static struct acpi_scan_handler generic_device_handler = {
1713         .ids = generic_device_ids,
1714         .attach = acpi_generic_device_attach,
1715 };
1716
1717 static int acpi_scan_attach_handler(struct acpi_device *device)
1718 {
1719         struct acpi_hardware_id *hwid;
1720         int ret = 0;
1721
1722         list_for_each_entry(hwid, &device->pnp.ids, list) {
1723                 const struct acpi_device_id *devid;
1724                 struct acpi_scan_handler *handler;
1725
1726                 handler = acpi_scan_match_handler(hwid->id, &devid);
1727                 if (handler) {
1728                         if (!handler->attach) {
1729                                 device->pnp.type.platform_id = 0;
1730                                 continue;
1731                         }
1732                         device->handler = handler;
1733                         ret = handler->attach(device, devid);
1734                         if (ret > 0)
1735                                 break;
1736
1737                         device->handler = NULL;
1738                         if (ret < 0)
1739                                 break;
1740                 }
1741         }
1742
1743         return ret;
1744 }
1745
1746 static void acpi_bus_attach(struct acpi_device *device)
1747 {
1748         struct acpi_device *child;
1749         acpi_handle ejd;
1750         int ret;
1751
1752         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1753                 register_dock_dependent_device(device, ejd);
1754
1755         acpi_bus_get_status(device);
1756         /* Skip devices that are not present. */
1757         if (!acpi_device_is_present(device)) {
1758                 device->flags.visited = false;
1759                 device->flags.power_manageable = 0;
1760                 return;
1761         }
1762         if (device->handler)
1763                 goto ok;
1764
1765         if (!device->flags.initialized) {
1766                 device->flags.power_manageable =
1767                         device->power.states[ACPI_STATE_D0].flags.valid;
1768                 if (acpi_bus_init_power(device))
1769                         device->flags.power_manageable = 0;
1770
1771                 device->flags.initialized = true;
1772         }
1773         device->flags.visited = false;
1774         ret = acpi_scan_attach_handler(device);
1775         if (ret < 0)
1776                 return;
1777
1778         device->flags.match_driver = true;
1779         if (!ret) {
1780                 ret = device_attach(&device->dev);
1781                 if (ret < 0)
1782                         return;
1783
1784                 if (!ret && device->pnp.type.platform_id)
1785                         acpi_default_enumeration(device);
1786         }
1787         device->flags.visited = true;
1788
1789  ok:
1790         list_for_each_entry(child, &device->children, node)
1791                 acpi_bus_attach(child);
1792
1793         if (device->handler && device->handler->hotplug.notify_online)
1794                 device->handler->hotplug.notify_online(device);
1795 }
1796
1797 void acpi_walk_dep_device_list(acpi_handle handle)
1798 {
1799         struct acpi_dep_data *dep, *tmp;
1800         struct acpi_device *adev;
1801
1802         mutex_lock(&acpi_dep_list_lock);
1803         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
1804                 if (dep->master == handle) {
1805                         acpi_bus_get_device(dep->slave, &adev);
1806                         if (!adev)
1807                                 continue;
1808
1809                         adev->dep_unmet--;
1810                         if (!adev->dep_unmet)
1811                                 acpi_bus_attach(adev);
1812                         list_del(&dep->node);
1813                         kfree(dep);
1814                 }
1815         }
1816         mutex_unlock(&acpi_dep_list_lock);
1817 }
1818 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
1819
1820 /**
1821  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1822  * @handle: Root of the namespace scope to scan.
1823  *
1824  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1825  * found devices.
1826  *
1827  * If no devices were found, -ENODEV is returned, but it does not mean that
1828  * there has been a real error.  There just have been no suitable ACPI objects
1829  * in the table trunk from which the kernel could create a device and add an
1830  * appropriate driver.
1831  *
1832  * Must be called under acpi_scan_lock.
1833  */
1834 int acpi_bus_scan(acpi_handle handle)
1835 {
1836         void *device = NULL;
1837
1838         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1839                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1840                                     acpi_bus_check_add, NULL, NULL, &device);
1841
1842         if (device) {
1843                 acpi_bus_attach(device);
1844                 return 0;
1845         }
1846         return -ENODEV;
1847 }
1848 EXPORT_SYMBOL(acpi_bus_scan);
1849
1850 /**
1851  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
1852  * @adev: Root of the ACPI namespace scope to walk.
1853  *
1854  * Must be called under acpi_scan_lock.
1855  */
1856 void acpi_bus_trim(struct acpi_device *adev)
1857 {
1858         struct acpi_scan_handler *handler = adev->handler;
1859         struct acpi_device *child;
1860
1861         list_for_each_entry_reverse(child, &adev->children, node)
1862                 acpi_bus_trim(child);
1863
1864         adev->flags.match_driver = false;
1865         if (handler) {
1866                 if (handler->detach)
1867                         handler->detach(adev);
1868
1869                 adev->handler = NULL;
1870         } else {
1871                 device_release_driver(&adev->dev);
1872         }
1873         /*
1874          * Most likely, the device is going away, so put it into D3cold before
1875          * that.
1876          */
1877         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
1878         adev->flags.initialized = false;
1879         adev->flags.visited = false;
1880 }
1881 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1882
1883 static int acpi_bus_scan_fixed(void)
1884 {
1885         int result = 0;
1886
1887         /*
1888          * Enumerate all fixed-feature devices.
1889          */
1890         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1891                 struct acpi_device *device = NULL;
1892
1893                 result = acpi_add_single_object(&device, NULL,
1894                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1895                                                 ACPI_STA_DEFAULT);
1896                 if (result)
1897                         return result;
1898
1899                 device->flags.match_driver = true;
1900                 result = device_attach(&device->dev);
1901                 if (result < 0)
1902                         return result;
1903
1904                 device_init_wakeup(&device->dev, true);
1905         }
1906
1907         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1908                 struct acpi_device *device = NULL;
1909
1910                 result = acpi_add_single_object(&device, NULL,
1911                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1912                                                 ACPI_STA_DEFAULT);
1913                 if (result)
1914                         return result;
1915
1916                 device->flags.match_driver = true;
1917                 result = device_attach(&device->dev);
1918         }
1919
1920         return result < 0 ? result : 0;
1921 }
1922
1923 int __init acpi_scan_init(void)
1924 {
1925         int result;
1926
1927         acpi_pci_root_init();
1928         acpi_pci_link_init();
1929         acpi_processor_init();
1930         acpi_lpss_init();
1931         acpi_apd_init();
1932         acpi_cmos_rtc_init();
1933         acpi_container_init();
1934         acpi_memory_hotplug_init();
1935         acpi_pnp_init();
1936         acpi_int340x_thermal_init();
1937
1938         acpi_scan_add_handler(&generic_device_handler);
1939
1940         mutex_lock(&acpi_scan_lock);
1941         /*
1942          * Enumerate devices in the ACPI namespace.
1943          */
1944         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1945         if (result)
1946                 goto out;
1947
1948         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1949         if (result)
1950                 goto out;
1951
1952         /* Fixed feature devices do not exist on HW-reduced platform */
1953         if (!acpi_gbl_reduced_hardware) {
1954                 result = acpi_bus_scan_fixed();
1955                 if (result) {
1956                         acpi_detach_data(acpi_root->handle,
1957                                          acpi_scan_drop_device);
1958                         acpi_device_del(acpi_root);
1959                         put_device(&acpi_root->dev);
1960                         goto out;
1961                 }
1962         }
1963
1964         acpi_update_all_gpes();
1965
1966  out:
1967         mutex_unlock(&acpi_scan_lock);
1968         return result;
1969 }
1970
1971 static struct acpi_probe_entry *ape;
1972 static int acpi_probe_count;
1973 static DEFINE_MUTEX(acpi_probe_mutex);
1974
1975 static int __init acpi_match_madt(struct acpi_subtable_header *header,
1976                                   const unsigned long end)
1977 {
1978         if (!ape->subtable_valid || ape->subtable_valid(header, ape))
1979                 if (!ape->probe_subtbl(header, end))
1980                         acpi_probe_count++;
1981
1982         return 0;
1983 }
1984
1985 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
1986 {
1987         int count = 0;
1988
1989         if (acpi_disabled)
1990                 return 0;
1991
1992         mutex_lock(&acpi_probe_mutex);
1993         for (ape = ap_head; nr; ape++, nr--) {
1994                 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
1995                         acpi_probe_count = 0;
1996                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
1997                         count += acpi_probe_count;
1998                 } else {
1999                         int res;
2000                         res = acpi_table_parse(ape->id, ape->probe_table);
2001                         if (!res)
2002                                 count++;
2003                 }
2004         }
2005         mutex_unlock(&acpi_probe_mutex);
2006
2007         return count;
2008 }