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