drivers/acpi/scan.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * scan.c - support for transforming the ACPI namespace into individual objects
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/init.h>
   8 #include <linux/slab.h>
   9 #include <linux/kernel.h>
  10 #include <linux/acpi.h>
  11 #include <linux/acpi_iort.h>
  12 #include <linux/signal.h>
  13 #include <linux/kthread.h>
  14 #include <linux/dmi.h>
  15 #include <linux/nls.h>
  16 #include <linux/dma-map-ops.h>
  17 #include <linux/platform_data/x86/apple.h>
  18 #include <linux/pgtable.h>
  19
  20 #include "internal.h"
  21
  22 #define _COMPONENT              ACPI_BUS_COMPONENT
  23 ACPI_MODULE_NAME("scan");
  24 extern struct acpi_device *acpi_root;
  25
  26 #define ACPI_BUS_CLASS                  "system_bus"
  27 #define ACPI_BUS_HID                    "LNXSYBUS"
  28 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  29
  30 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  31
  32 #define INVALID_ACPI_HANDLE     ((acpi_handle)empty_zero_page)
  33
  34 static const char *dummy_hid = "device";
  35
  36 static LIST_HEAD(acpi_dep_list);
  37 static DEFINE_MUTEX(acpi_dep_list_lock);
  38 LIST_HEAD(acpi_bus_id_list);
  39 static DEFINE_MUTEX(acpi_scan_lock);
  40 static LIST_HEAD(acpi_scan_handlers_list);
  41 DEFINE_MUTEX(acpi_device_lock);
  42 LIST_HEAD(acpi_wakeup_device_list);
  43 static DEFINE_MUTEX(acpi_hp_context_lock);
  44
  45 /*
  46  * The UART device described by the SPCR table is the only object which needs
  47  * special-casing. Everything else is covered by ACPI namespace paths in STAO
  48  * table.
  49  */
  50 static u64 spcr_uart_addr;
  51
  52 struct acpi_dep_data {
  53         struct list_head node;
  54         acpi_handle master;
  55         acpi_handle slave;
  56 };
  57
  58 void acpi_scan_lock_acquire(void)
  59 {
  60         mutex_lock(&acpi_scan_lock);
  61 }
  62 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  63
  64 void acpi_scan_lock_release(void)
  65 {
  66         mutex_unlock(&acpi_scan_lock);
  67 }
  68 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  69
  70 void acpi_lock_hp_context(void)
  71 {
  72         mutex_lock(&acpi_hp_context_lock);
  73 }
  74
  75 void acpi_unlock_hp_context(void)
  76 {
  77         mutex_unlock(&acpi_hp_context_lock);
  78 }
  79
  80 void acpi_initialize_hp_context(struct acpi_device *adev,
  81                                 struct acpi_hotplug_context *hp,
  82                                 int (*notify)(struct acpi_device *, u32),
  83                                 void (*uevent)(struct acpi_device *, u32))
  84 {
  85         acpi_lock_hp_context();
  86         hp->notify = notify;
  87         hp->uevent = uevent;
  88         acpi_set_hp_context(adev, hp);
  89         acpi_unlock_hp_context();
  90 }
  91 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
  92
  93 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  94 {
  95         if (!handler)
  96                 return -EINVAL;
  97
  98         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  99         return 0;
 100 }
 101
 102 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
 103                                        const char *hotplug_profile_name)
 104 {
 105         int error;
 106
 107         error = acpi_scan_add_handler(handler);
 108         if (error)
 109                 return error;
 110
 111         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
 112         return 0;
 113 }
 114
 115 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 116 {
 117         struct acpi_device_physical_node *pn;
 118         bool offline = true;
 119         char *envp[] = { "EVENT=offline", NULL };
 120
 121         /*
 122          * acpi_container_offline() calls this for all of the container's
 123          * children under the container's physical_node_lock lock.
 124          */
 125         mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
 126
 127         list_for_each_entry(pn, &adev->physical_node_list, node)
 128                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
 129                         if (uevent)
 130                                 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
 131
 132                         offline = false;
 133                         break;
 134                 }
 135
 136         mutex_unlock(&adev->physical_node_lock);
 137         return offline;
 138 }
 139
 140 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 141                                     void **ret_p)
 142 {
 143         struct acpi_device *device = NULL;
 144         struct acpi_device_physical_node *pn;
 145         bool second_pass = (bool)data;
 146         acpi_status status = AE_OK;
 147
 148         if (acpi_bus_get_device(handle, &device))
 149                 return AE_OK;
 150
 151         if (device->handler && !device->handler->hotplug.enabled) {
 152                 *ret_p = &device->dev;
 153                 return AE_SUPPORT;
 154         }
 155
 156         mutex_lock(&device->physical_node_lock);
 157
 158         list_for_each_entry(pn, &device->physical_node_list, node) {
 159                 int ret;
 160
 161                 if (second_pass) {
 162                         /* Skip devices offlined by the first pass. */
 163                         if (pn->put_online)
 164                                 continue;
 165                 } else {
 166                         pn->put_online = false;
 167                 }
 168                 ret = device_offline(pn->dev);
 169                 if (ret >= 0) {
 170                         pn->put_online = !ret;
 171                 } else {
 172                         *ret_p = pn->dev;
 173                         if (second_pass) {
 174                                 status = AE_ERROR;
 175                                 break;
 176                         }
 177                 }
 178         }
 179
 180         mutex_unlock(&device->physical_node_lock);
 181
 182         return status;
 183 }
 184
 185 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 186                                    void **ret_p)
 187 {
 188         struct acpi_device *device = NULL;
 189         struct acpi_device_physical_node *pn;
 190
 191         if (acpi_bus_get_device(handle, &device))
 192                 return AE_OK;
 193
 194         mutex_lock(&device->physical_node_lock);
 195
 196         list_for_each_entry(pn, &device->physical_node_list, node)
 197                 if (pn->put_online) {
 198                         device_online(pn->dev);
 199                         pn->put_online = false;
 200                 }
 201
 202         mutex_unlock(&device->physical_node_lock);
 203
 204         return AE_OK;
 205 }
 206
 207 static int acpi_scan_try_to_offline(struct acpi_device *device)
 208 {
 209         acpi_handle handle = device->handle;
 210         struct device *errdev = NULL;
 211         acpi_status status;
 212
 213         /*
 214          * Carry out two passes here and ignore errors in the first pass,
 215          * because if the devices in question are memory blocks and
 216          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 217          * that the other blocks depend on, but it is not known in advance which
 218          * block holds them.
 219          *
 220          * If the first pass is successful, the second one isn't needed, though.
 221          */
 222         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 223                                      NULL, acpi_bus_offline, (void *)false,
 224                                      (void **)&errdev);
 225         if (status == AE_SUPPORT) {
 226                 dev_warn(errdev, "Offline disabled.\n");
 227                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 228                                     acpi_bus_online, NULL, NULL, NULL);
 229                 return -EPERM;
 230         }
 231         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
 232         if (errdev) {
 233                 errdev = NULL;
 234                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 235                                     NULL, acpi_bus_offline, (void *)true,
 236                                     (void **)&errdev);
 237                 if (!errdev)
 238                         acpi_bus_offline(handle, 0, (void *)true,
 239                                          (void **)&errdev);
 240
 241                 if (errdev) {
 242                         dev_warn(errdev, "Offline failed.\n");
 243                         acpi_bus_online(handle, 0, NULL, NULL);
 244                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 245                                             ACPI_UINT32_MAX, acpi_bus_online,
 246                                             NULL, NULL, NULL);
 247                         return -EBUSY;
 248                 }
 249         }
 250         return 0;
 251 }
 252
 253 static int acpi_scan_hot_remove(struct acpi_device *device)
 254 {
 255         acpi_handle handle = device->handle;
 256         unsigned long long sta;
 257         acpi_status status;
 258
 259         if (device->handler && device->handler->hotplug.demand_offline) {
 260                 if (!acpi_scan_is_offline(device, true))
 261                         return -EBUSY;
 262         } else {
 263                 int error = acpi_scan_try_to_offline(device);
 264                 if (error)
 265                         return error;
 266         }
 267
 268         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 269                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 270
 271         acpi_bus_trim(device);
 272
 273         acpi_evaluate_lck(handle, 0);
 274         /*
 275          * TBD: _EJD support.
 276          */
 277         status = acpi_evaluate_ej0(handle);
 278         if (status == AE_NOT_FOUND)
 279                 return -ENODEV;
 280         else if (ACPI_FAILURE(status))
 281                 return -EIO;
 282
 283         /*
 284          * Verify if eject was indeed successful.  If not, log an error
 285          * message.  No need to call _OST since _EJ0 call was made OK.
 286          */
 287         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 288         if (ACPI_FAILURE(status)) {
 289                 acpi_handle_warn(handle,
 290                         "Status check after eject failed (0x%x)\n", status);
 291         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 292                 acpi_handle_warn(handle,
 293                         "Eject incomplete - status 0x%llx\n", sta);
 294         }
 295
 296         return 0;
 297 }
 298
 299 static int acpi_scan_device_not_present(struct acpi_device *adev)
 300 {
 301         if (!acpi_device_enumerated(adev)) {
 302                 dev_warn(&adev->dev, "Still not present\n");
 303                 return -EALREADY;
 304         }
 305         acpi_bus_trim(adev);
 306         return 0;
 307 }
 308
 309 static int acpi_scan_device_check(struct acpi_device *adev)
 310 {
 311         int error;
 312
 313         acpi_bus_get_status(adev);
 314         if (adev->status.present || adev->status.functional) {
 315                 /*
 316                  * This function is only called for device objects for which
 317                  * matching scan handlers exist.  The only situation in which
 318                  * the scan handler is not attached to this device object yet
 319                  * is when the device has just appeared (either it wasn't
 320                  * present at all before or it was removed and then added
 321                  * again).
 322                  */
 323                 if (adev->handler) {
 324                         dev_dbg(&adev->dev, "Already enumerated\n");
 325                         return 0;
 326                 }
 327                 error = acpi_bus_scan(adev->handle);
 328                 if (error) {
 329                         dev_warn(&adev->dev, "Namespace scan failure\n");
 330                         return error;
 331                 }
 332         } else {
 333                 error = acpi_scan_device_not_present(adev);
 334         }
 335         return error;
 336 }
 337
 338 static int acpi_scan_bus_check(struct acpi_device *adev)
 339 {
 340         struct acpi_scan_handler *handler = adev->handler;
 341         struct acpi_device *child;
 342         int error;
 343
 344         acpi_bus_get_status(adev);
 345         if (!(adev->status.present || adev->status.functional)) {
 346                 acpi_scan_device_not_present(adev);
 347                 return 0;
 348         }
 349         if (handler && handler->hotplug.scan_dependent)
 350                 return handler->hotplug.scan_dependent(adev);
 351
 352         error = acpi_bus_scan(adev->handle);
 353         if (error) {
 354                 dev_warn(&adev->dev, "Namespace scan failure\n");
 355                 return error;
 356         }
 357         list_for_each_entry(child, &adev->children, node) {
 358                 error = acpi_scan_bus_check(child);
 359                 if (error)
 360                         return error;
 361         }
 362         return 0;
 363 }
 364
 365 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 366 {
 367         switch (type) {
 368         case ACPI_NOTIFY_BUS_CHECK:
 369                 return acpi_scan_bus_check(adev);
 370         case ACPI_NOTIFY_DEVICE_CHECK:
 371                 return acpi_scan_device_check(adev);
 372         case ACPI_NOTIFY_EJECT_REQUEST:
 373         case ACPI_OST_EC_OSPM_EJECT:
 374                 if (adev->handler && !adev->handler->hotplug.enabled) {
 375                         dev_info(&adev->dev, "Eject disabled\n");
 376                         return -EPERM;
 377                 }
 378                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 379                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 380                 return acpi_scan_hot_remove(adev);
 381         }
 382         return -EINVAL;
 383 }
 384
 385 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 386 {
 387         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 388         int error = -ENODEV;
 389
 390         lock_device_hotplug();
 391         mutex_lock(&acpi_scan_lock);
 392
 393         /*
 394          * The device object's ACPI handle cannot become invalid as long as we
 395          * are holding acpi_scan_lock, but it might have become invalid before
 396          * that lock was acquired.
 397          */
 398         if (adev->handle == INVALID_ACPI_HANDLE)
 399                 goto err_out;
 400
 401         if (adev->flags.is_dock_station) {
 402                 error = dock_notify(adev, src);
 403         } else if (adev->flags.hotplug_notify) {
 404                 error = acpi_generic_hotplug_event(adev, src);
 405         } else {
 406                 int (*notify)(struct acpi_device *, u32);
 407
 408                 acpi_lock_hp_context();
 409                 notify = adev->hp ? adev->hp->notify : NULL;
 410                 acpi_unlock_hp_context();
 411                 /*
 412                  * There may be additional notify handlers for device objects
 413                  * without the .event() callback, so ignore them here.
 414                  */
 415                 if (notify)
 416                         error = notify(adev, src);
 417                 else
 418                         goto out;
 419         }
 420         switch (error) {
 421         case 0:
 422                 ost_code = ACPI_OST_SC_SUCCESS;
 423                 break;
 424         case -EPERM:
 425                 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 426                 break;
 427         case -EBUSY:
 428                 ost_code = ACPI_OST_SC_DEVICE_BUSY;
 429                 break;
 430         default:
 431                 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 432                 break;
 433         }
 434
 435  err_out:
 436         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 437
 438  out:
 439         acpi_bus_put_acpi_device(adev);
 440         mutex_unlock(&acpi_scan_lock);
 441         unlock_device_hotplug();
 442 }
 443
 444 static void acpi_free_power_resources_lists(struct acpi_device *device)
 445 {
 446         int i;
 447
 448         if (device->wakeup.flags.valid)
 449                 acpi_power_resources_list_free(&device->wakeup.resources);
 450
 451         if (!device->power.flags.power_resources)
 452                 return;
 453
 454         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 455                 struct acpi_device_power_state *ps = &device->power.states[i];
 456                 acpi_power_resources_list_free(&ps->resources);
 457         }
 458 }
 459
 460 static void acpi_device_release(struct device *dev)
 461 {
 462         struct acpi_device *acpi_dev = to_acpi_device(dev);
 463
 464         acpi_free_properties(acpi_dev);
 465         acpi_free_pnp_ids(&acpi_dev->pnp);
 466         acpi_free_power_resources_lists(acpi_dev);
 467         kfree(acpi_dev);
 468 }
 469
 470 static void acpi_device_del(struct acpi_device *device)
 471 {
 472         struct acpi_device_bus_id *acpi_device_bus_id;
 473
 474         mutex_lock(&acpi_device_lock);
 475         if (device->parent)
 476                 list_del(&device->node);
 477
 478         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
 479                 if (!strcmp(acpi_device_bus_id->bus_id,
 480                             acpi_device_hid(device))) {
 481                         ida_simple_remove(&acpi_device_bus_id->instance_ida, device->pnp.instance_no);
 482                         if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
 483                                 list_del(&acpi_device_bus_id->node);
 484                                 kfree_const(acpi_device_bus_id->bus_id);
 485                                 kfree(acpi_device_bus_id);
 486                         }
 487                         break;
 488                 }
 489
 490         list_del(&device->wakeup_list);
 491         mutex_unlock(&acpi_device_lock);
 492
 493         acpi_power_add_remove_device(device, false);
 494         acpi_device_remove_files(device);
 495         if (device->remove)
 496                 device->remove(device);
 497
 498         device_del(&device->dev);
 499 }
 500
 501 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
 502
 503 static LIST_HEAD(acpi_device_del_list);
 504 static DEFINE_MUTEX(acpi_device_del_lock);
 505
 506 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 507 {
 508         for (;;) {
 509                 struct acpi_device *adev;
 510
 511                 mutex_lock(&acpi_device_del_lock);
 512
 513                 if (list_empty(&acpi_device_del_list)) {
 514                         mutex_unlock(&acpi_device_del_lock);
 515                         break;
 516                 }
 517                 adev = list_first_entry(&acpi_device_del_list,
 518                                         struct acpi_device, del_list);
 519                 list_del(&adev->del_list);
 520
 521                 mutex_unlock(&acpi_device_del_lock);
 522
 523                 blocking_notifier_call_chain(&acpi_reconfig_chain,
 524                                              ACPI_RECONFIG_DEVICE_REMOVE, adev);
 525
 526                 acpi_device_del(adev);
 527                 /*
 528                  * Drop references to all power resources that might have been
 529                  * used by the device.
 530                  */
 531                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
 532                 put_device(&adev->dev);
 533         }
 534 }
 535
 536 /**
 537  * acpi_scan_drop_device - Drop an ACPI device object.
 538  * @handle: Handle of an ACPI namespace node, not used.
 539  * @context: Address of the ACPI device object to drop.
 540  *
 541  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
 542  * namespace node the device object pointed to by @context is attached to.
 543  *
 544  * The unregistration is carried out asynchronously to avoid running
 545  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
 546  * ensure the correct ordering (the device objects must be unregistered in the
 547  * same order in which the corresponding namespace nodes are deleted).
 548  */
 549 static void acpi_scan_drop_device(acpi_handle handle, void *context)
 550 {
 551         static DECLARE_WORK(work, acpi_device_del_work_fn);
 552         struct acpi_device *adev = context;
 553
 554         mutex_lock(&acpi_device_del_lock);
 555
 556         /*
 557          * Use the ACPI hotplug workqueue which is ordered, so this work item
 558          * won't run after any hotplug work items submitted subsequently.  That
 559          * prevents attempts to register device objects identical to those being
 560          * deleted from happening concurrently (such attempts result from
 561          * hotplug events handled via the ACPI hotplug workqueue).  It also will
 562          * run after all of the work items submitted previosuly, which helps
 563          * those work items to ensure that they are not accessing stale device
 564          * objects.
 565          */
 566         if (list_empty(&acpi_device_del_list))
 567                 acpi_queue_hotplug_work(&work);
 568
 569         list_add_tail(&adev->del_list, &acpi_device_del_list);
 570         /* Make acpi_ns_validate_handle() return NULL for this handle. */
 571         adev->handle = INVALID_ACPI_HANDLE;
 572
 573         mutex_unlock(&acpi_device_del_lock);
 574 }
 575
 576 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
 577                                 void (*callback)(void *))
 578 {
 579         acpi_status status;
 580
 581         if (!device)
 582                 return -EINVAL;
 583
 584         *device = NULL;
 585
 586         status = acpi_get_data_full(handle, acpi_scan_drop_device,
 587                                     (void **)device, callback);
 588         if (ACPI_FAILURE(status) || !*device) {
 589                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 590                                   handle));
 591                 return -ENODEV;
 592         }
 593         return 0;
 594 }
 595
 596 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 597 {
 598         return acpi_get_device_data(handle, device, NULL);
 599 }
 600 EXPORT_SYMBOL(acpi_bus_get_device);
 601
 602 static void get_acpi_device(void *dev)
 603 {
 604         if (dev)
 605                 get_device(&((struct acpi_device *)dev)->dev);
 606 }
 607
 608 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 609 {
 610         struct acpi_device *adev = NULL;
 611
 612         acpi_get_device_data(handle, &adev, get_acpi_device);
 613         return adev;
 614 }
 615
 616 void acpi_bus_put_acpi_device(struct acpi_device *adev)
 617 {
 618         put_device(&adev->dev);
 619 }
 620
 621 static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
 622 {
 623         struct acpi_device_bus_id *acpi_device_bus_id;
 624
 625         /* Find suitable bus_id and instance number in acpi_bus_id_list. */
 626         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 627                 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
 628                         return acpi_device_bus_id;
 629         }
 630         return NULL;
 631 }
 632
 633 static int acpi_device_set_name(struct acpi_device *device,
 634                                 struct acpi_device_bus_id *acpi_device_bus_id)
 635 {
 636         struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
 637         int result;
 638
 639         result = ida_simple_get(instance_ida, 0, ACPI_MAX_DEVICE_INSTANCES, GFP_KERNEL);
 640         if (result < 0)
 641                 return result;
 642
 643         device->pnp.instance_no = result;
 644         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
 645         return 0;
 646 }
 647
 648 int acpi_device_add(struct acpi_device *device,
 649                     void (*release)(struct device *))
 650 {
 651         struct acpi_device_bus_id *acpi_device_bus_id;
 652         int result;
 653
 654         if (device->handle) {
 655                 acpi_status status;
 656
 657                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
 658                                           device);
 659                 if (ACPI_FAILURE(status)) {
 660                         acpi_handle_err(device->handle,
 661                                         "Unable to attach device data\n");
 662                         return -ENODEV;
 663                 }
 664         }
 665
 666         /*
 667          * Linkage
 668          * -------
 669          * Link this device to its parent and siblings.
 670          */
 671         INIT_LIST_HEAD(&device->children);
 672         INIT_LIST_HEAD(&device->node);
 673         INIT_LIST_HEAD(&device->wakeup_list);
 674         INIT_LIST_HEAD(&device->physical_node_list);
 675         INIT_LIST_HEAD(&device->del_list);
 676         mutex_init(&device->physical_node_lock);
 677
 678         mutex_lock(&acpi_device_lock);
 679
 680         acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
 681         if (acpi_device_bus_id) {
 682                 result = acpi_device_set_name(device, acpi_device_bus_id);
 683                 if (result)
 684                         goto err_unlock;
 685         } else {
 686                 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
 687                                              GFP_KERNEL);
 688                 if (!acpi_device_bus_id) {
 689                         result = -ENOMEM;
 690                         goto err_unlock;
 691                 }
 692                 acpi_device_bus_id->bus_id =
 693                         kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
 694                 if (!acpi_device_bus_id->bus_id) {
 695                         kfree(acpi_device_bus_id);
 696                         result = -ENOMEM;
 697                         goto err_unlock;
 698                 }
 699
 700                 ida_init(&acpi_device_bus_id->instance_ida);
 701
 702                 result = acpi_device_set_name(device, acpi_device_bus_id);
 703                 if (result) {
 704                         kfree_const(acpi_device_bus_id->bus_id);
 705                         kfree(acpi_device_bus_id);
 706                         goto err_unlock;
 707                 }
 708
 709                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 710         }
 711
 712         if (device->parent)
 713                 list_add_tail(&device->node, &device->parent->children);
 714
 715         if (device->wakeup.flags.valid)
 716                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 717         mutex_unlock(&acpi_device_lock);
 718
 719         if (device->parent)
 720                 device->dev.parent = &device->parent->dev;
 721         device->dev.bus = &acpi_bus_type;
 722         device->dev.release = release;
 723         result = device_add(&device->dev);
 724         if (result) {
 725                 dev_err(&device->dev, "Error registering device\n");
 726                 goto err;
 727         }
 728
 729         result = acpi_device_setup_files(device);
 730         if (result)
 731                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 732                        dev_name(&device->dev));
 733
 734         return 0;
 735
 736  err:
 737         mutex_lock(&acpi_device_lock);
 738         if (device->parent)
 739                 list_del(&device->node);
 740         list_del(&device->wakeup_list);
 741
 742  err_unlock:
 743         mutex_unlock(&acpi_device_lock);
 744
 745         acpi_detach_data(device->handle, acpi_scan_drop_device);
 746         return result;
 747 }
 748
 749 /* --------------------------------------------------------------------------
 750                                  Device Enumeration
 751    -------------------------------------------------------------------------- */
 752 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 753 {
 754         struct acpi_device *device = NULL;
 755         acpi_status status;
 756
 757         /*
 758          * Fixed hardware devices do not appear in the namespace and do not
 759          * have handles, but we fabricate acpi_devices for them, so we have
 760          * to deal with them specially.
 761          */
 762         if (!handle)
 763                 return acpi_root;
 764
 765         do {
 766                 status = acpi_get_parent(handle, &handle);
 767                 if (ACPI_FAILURE(status))
 768                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 769         } while (acpi_bus_get_device(handle, &device));
 770         return device;
 771 }
 772
 773 acpi_status
 774 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 775 {
 776         acpi_status status;
 777         acpi_handle tmp;
 778         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 779         union acpi_object *obj;
 780
 781         status = acpi_get_handle(handle, "_EJD", &tmp);
 782         if (ACPI_FAILURE(status))
 783                 return status;
 784
 785         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 786         if (ACPI_SUCCESS(status)) {
 787                 obj = buffer.pointer;
 788                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 789                                          ejd);
 790                 kfree(buffer.pointer);
 791         }
 792         return status;
 793 }
 794 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 795
 796 static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
 797 {
 798         acpi_handle handle = dev->handle;
 799         struct acpi_device_wakeup *wakeup = &dev->wakeup;
 800         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 801         union acpi_object *package = NULL;
 802         union acpi_object *element = NULL;
 803         acpi_status status;
 804         int err = -ENODATA;
 805
 806         INIT_LIST_HEAD(&wakeup->resources);
 807
 808         /* _PRW */
 809         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 810         if (ACPI_FAILURE(status)) {
 811                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 812                 return err;
 813         }
 814
 815         package = (union acpi_object *)buffer.pointer;
 816
 817         if (!package || package->package.count < 2)
 818                 goto out;
 819
 820         element = &(package->package.elements[0]);
 821         if (!element)
 822                 goto out;
 823
 824         if (element->type == ACPI_TYPE_PACKAGE) {
 825                 if ((element->package.count < 2) ||
 826                     (element->package.elements[0].type !=
 827                      ACPI_TYPE_LOCAL_REFERENCE)
 828                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 829                         goto out;
 830
 831                 wakeup->gpe_device =
 832                     element->package.elements[0].reference.handle;
 833                 wakeup->gpe_number =
 834                     (u32) element->package.elements[1].integer.value;
 835         } else if (element->type == ACPI_TYPE_INTEGER) {
 836                 wakeup->gpe_device = NULL;
 837                 wakeup->gpe_number = element->integer.value;
 838         } else {
 839                 goto out;
 840         }
 841
 842         element = &(package->package.elements[1]);
 843         if (element->type != ACPI_TYPE_INTEGER)
 844                 goto out;
 845
 846         wakeup->sleep_state = element->integer.value;
 847
 848         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 849         if (err)
 850                 goto out;
 851
 852         if (!list_empty(&wakeup->resources)) {
 853                 int sleep_state;
 854
 855                 err = acpi_power_wakeup_list_init(&wakeup->resources,
 856                                                   &sleep_state);
 857                 if (err) {
 858                         acpi_handle_warn(handle, "Retrieving current states "
 859                                          "of wakeup power resources failed\n");
 860                         acpi_power_resources_list_free(&wakeup->resources);
 861                         goto out;
 862                 }
 863                 if (sleep_state < wakeup->sleep_state) {
 864                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
 865                                          "(S%d) by S%d from power resources\n",
 866                                          (int)wakeup->sleep_state, sleep_state);
 867                         wakeup->sleep_state = sleep_state;
 868                 }
 869         }
 870
 871  out:
 872         kfree(buffer.pointer);
 873         return err;
 874 }
 875
 876 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
 877 {
 878         static const struct acpi_device_id button_device_ids[] = {
 879                 {"PNP0C0C", 0},         /* Power button */
 880                 {"PNP0C0D", 0},         /* Lid */
 881                 {"PNP0C0E", 0},         /* Sleep button */
 882                 {"", 0},
 883         };
 884         struct acpi_device_wakeup *wakeup = &device->wakeup;
 885         acpi_status status;
 886
 887         wakeup->flags.notifier_present = 0;
 888
 889         /* Power button, Lid switch always enable wakeup */
 890         if (!acpi_match_device_ids(device, button_device_ids)) {
 891                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 892                         /* Do not use Lid/sleep button for S5 wakeup */
 893                         if (wakeup->sleep_state == ACPI_STATE_S5)
 894                                 wakeup->sleep_state = ACPI_STATE_S4;
 895                 }
 896                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 897                 device_set_wakeup_capable(&device->dev, true);
 898                 return true;
 899         }
 900
 901         status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 902                                          wakeup->gpe_number);
 903         return ACPI_SUCCESS(status);
 904 }
 905
 906 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 907 {
 908         int err;
 909
 910         /* Presence of _PRW indicates wake capable */
 911         if (!acpi_has_method(device->handle, "_PRW"))
 912                 return;
 913
 914         err = acpi_bus_extract_wakeup_device_power_package(device);
 915         if (err) {
 916                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
 917                 return;
 918         }
 919
 920         device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
 921         device->wakeup.prepare_count = 0;
 922         /*
 923          * Call _PSW/_DSW object to disable its ability to wake the sleeping
 924          * system for the ACPI device with the _PRW object.
 925          * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
 926          * So it is necessary to call _DSW object first. Only when it is not
 927          * present will the _PSW object used.
 928          */
 929         err = acpi_device_sleep_wake(device, 0, 0, 0);
 930         if (err)
 931                 pr_debug("error in _DSW or _PSW evaluation\n");
 932 }
 933
 934 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 935 {
 936         struct acpi_device_power_state *ps = &device->power.states[state];
 937         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 938         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 939         acpi_status status;
 940
 941         INIT_LIST_HEAD(&ps->resources);
 942
 943         /* Evaluate "_PRx" to get referenced power resources */
 944         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 945         if (ACPI_SUCCESS(status)) {
 946                 union acpi_object *package = buffer.pointer;
 947
 948                 if (buffer.length && package
 949                     && package->type == ACPI_TYPE_PACKAGE
 950                     && package->package.count)
 951                         acpi_extract_power_resources(package, 0, &ps->resources);
 952
 953                 ACPI_FREE(buffer.pointer);
 954         }
 955
 956         /* Evaluate "_PSx" to see if we can do explicit sets */
 957         pathname[2] = 'S';
 958         if (acpi_has_method(device->handle, pathname))
 959                 ps->flags.explicit_set = 1;
 960
 961         /* State is valid if there are means to put the device into it. */
 962         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
 963                 ps->flags.valid = 1;
 964
 965         ps->power = -1;         /* Unknown - driver assigned */
 966         ps->latency = -1;       /* Unknown - driver assigned */
 967 }
 968
 969 static void acpi_bus_get_power_flags(struct acpi_device *device)
 970 {
 971         u32 i;
 972
 973         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 974         if (!acpi_has_method(device->handle, "_PS0") &&
 975             !acpi_has_method(device->handle, "_PR0"))
 976                 return;
 977
 978         device->flags.power_manageable = 1;
 979
 980         /*
 981          * Power Management Flags
 982          */
 983         if (acpi_has_method(device->handle, "_PSC"))
 984                 device->power.flags.explicit_get = 1;
 985
 986         if (acpi_has_method(device->handle, "_IRC"))
 987                 device->power.flags.inrush_current = 1;
 988
 989         if (acpi_has_method(device->handle, "_DSW"))
 990                 device->power.flags.dsw_present = 1;
 991
 992         /*
 993          * Enumerate supported power management states
 994          */
 995         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
 996                 acpi_bus_init_power_state(device, i);
 997
 998         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
 999
1000         /* Set the defaults for D0 and D3hot (always supported). */
1001         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1002         device->power.states[ACPI_STATE_D0].power = 100;
1003         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1004
1005         /*
1006          * Use power resources only if the D0 list of them is populated, because
1007          * some platforms may provide _PR3 only to indicate D3cold support and
1008          * in those cases the power resources list returned by it may be bogus.
1009          */
1010         if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1011                 device->power.flags.power_resources = 1;
1012                 /*
1013                  * D3cold is supported if the D3hot list of power resources is
1014                  * not empty.
1015                  */
1016                 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1017                         device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1018         }
1019
1020         if (acpi_bus_init_power(device))
1021                 device->flags.power_manageable = 0;
1022 }
1023
1024 static void acpi_bus_get_flags(struct acpi_device *device)
1025 {
1026         /* Presence of _STA indicates 'dynamic_status' */
1027         if (acpi_has_method(device->handle, "_STA"))
1028                 device->flags.dynamic_status = 1;
1029
1030         /* Presence of _RMV indicates 'removable' */
1031         if (acpi_has_method(device->handle, "_RMV"))
1032                 device->flags.removable = 1;
1033
1034         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1035         if (acpi_has_method(device->handle, "_EJD") ||
1036             acpi_has_method(device->handle, "_EJ0"))
1037                 device->flags.ejectable = 1;
1038 }
1039
1040 static void acpi_device_get_busid(struct acpi_device *device)
1041 {
1042         char bus_id[5] = { '?', 0 };
1043         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1044         int i = 0;
1045
1046         /*
1047          * Bus ID
1048          * ------
1049          * The device's Bus ID is simply the object name.
1050          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1051          */
1052         if (ACPI_IS_ROOT_DEVICE(device)) {
1053                 strcpy(device->pnp.bus_id, "ACPI");
1054                 return;
1055         }
1056
1057         switch (device->device_type) {
1058         case ACPI_BUS_TYPE_POWER_BUTTON:
1059                 strcpy(device->pnp.bus_id, "PWRF");
1060                 break;
1061         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1062                 strcpy(device->pnp.bus_id, "SLPF");
1063                 break;
1064         case ACPI_BUS_TYPE_ECDT_EC:
1065                 strcpy(device->pnp.bus_id, "ECDT");
1066                 break;
1067         default:
1068                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1069                 /* Clean up trailing underscores (if any) */
1070                 for (i = 3; i > 1; i--) {
1071                         if (bus_id[i] == '_')
1072                                 bus_id[i] = '\0';
1073                         else
1074                                 break;
1075                 }
1076                 strcpy(device->pnp.bus_id, bus_id);
1077                 break;
1078         }
1079 }
1080
1081 /*
1082  * acpi_ata_match - see if an acpi object is an ATA device
1083  *
1084  * If an acpi object has one of the ACPI ATA methods defined,
1085  * then we can safely call it an ATA device.
1086  */
1087 bool acpi_ata_match(acpi_handle handle)
1088 {
1089         return acpi_has_method(handle, "_GTF") ||
1090                acpi_has_method(handle, "_GTM") ||
1091                acpi_has_method(handle, "_STM") ||
1092                acpi_has_method(handle, "_SDD");
1093 }
1094
1095 /*
1096  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1097  *
1098  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1099  * then we can safely call it an ejectable drive bay
1100  */
1101 bool acpi_bay_match(acpi_handle handle)
1102 {
1103         acpi_handle phandle;
1104
1105         if (!acpi_has_method(handle, "_EJ0"))
1106                 return false;
1107         if (acpi_ata_match(handle))
1108                 return true;
1109         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1110                 return false;
1111
1112         return acpi_ata_match(phandle);
1113 }
1114
1115 bool acpi_device_is_battery(struct acpi_device *adev)
1116 {
1117         struct acpi_hardware_id *hwid;
1118
1119         list_for_each_entry(hwid, &adev->pnp.ids, list)
1120                 if (!strcmp("PNP0C0A", hwid->id))
1121                         return true;
1122
1123         return false;
1124 }
1125
1126 static bool is_ejectable_bay(struct acpi_device *adev)
1127 {
1128         acpi_handle handle = adev->handle;
1129
1130         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1131                 return true;
1132
1133         return acpi_bay_match(handle);
1134 }
1135
1136 /*
1137  * acpi_dock_match - see if an acpi object has a _DCK method
1138  */
1139 bool acpi_dock_match(acpi_handle handle)
1140 {
1141         return acpi_has_method(handle, "_DCK");
1142 }
1143
1144 static acpi_status
1145 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1146                           void **return_value)
1147 {
1148         long *cap = context;
1149
1150         if (acpi_has_method(handle, "_BCM") &&
1151             acpi_has_method(handle, "_BCL")) {
1152                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1153                                   "support\n"));
1154                 *cap |= ACPI_VIDEO_BACKLIGHT;
1155                 /* We have backlight support, no need to scan further */
1156                 return AE_CTRL_TERMINATE;
1157         }
1158         return 0;
1159 }
1160
1161 /* Returns true if the ACPI object is a video device which can be
1162  * handled by video.ko.
1163  * The device will get a Linux specific CID added in scan.c to
1164  * identify the device as an ACPI graphics device
1165  * Be aware that the graphics device may not be physically present
1166  * Use acpi_video_get_capabilities() to detect general ACPI video
1167  * capabilities of present cards
1168  */
1169 long acpi_is_video_device(acpi_handle handle)
1170 {
1171         long video_caps = 0;
1172
1173         /* Is this device able to support video switching ? */
1174         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1175                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1176
1177         /* Is this device able to retrieve a video ROM ? */
1178         if (acpi_has_method(handle, "_ROM"))
1179                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1180
1181         /* Is this device able to configure which video head to be POSTed ? */
1182         if (acpi_has_method(handle, "_VPO") &&
1183             acpi_has_method(handle, "_GPD") &&
1184             acpi_has_method(handle, "_SPD"))
1185                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1186
1187         /* Only check for backlight functionality if one of the above hit. */
1188         if (video_caps)
1189                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1190                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1191                                     &video_caps, NULL);
1192
1193         return video_caps;
1194 }
1195 EXPORT_SYMBOL(acpi_is_video_device);
1196
1197 const char *acpi_device_hid(struct acpi_device *device)
1198 {
1199         struct acpi_hardware_id *hid;
1200
1201         if (list_empty(&device->pnp.ids))
1202                 return dummy_hid;
1203
1204         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1205         return hid->id;
1206 }
1207 EXPORT_SYMBOL(acpi_device_hid);
1208
1209 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1210 {
1211         struct acpi_hardware_id *id;
1212
1213         id = kmalloc(sizeof(*id), GFP_KERNEL);
1214         if (!id)
1215                 return;
1216
1217         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1218         if (!id->id) {
1219                 kfree(id);
1220                 return;
1221         }
1222
1223         list_add_tail(&id->list, &pnp->ids);
1224         pnp->type.hardware_id = 1;
1225 }
1226
1227 /*
1228  * Old IBM workstations have a DSDT bug wherein the SMBus object
1229  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1230  * prefix.  Work around this.
1231  */
1232 static bool acpi_ibm_smbus_match(acpi_handle handle)
1233 {
1234         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1235         struct acpi_buffer path = { sizeof(node_name), node_name };
1236
1237         if (!dmi_name_in_vendors("IBM"))
1238                 return false;
1239
1240         /* Look for SMBS object */
1241         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1242             strcmp("SMBS", path.pointer))
1243                 return false;
1244
1245         /* Does it have the necessary (but misnamed) methods? */
1246         if (acpi_has_method(handle, "SBI") &&
1247             acpi_has_method(handle, "SBR") &&
1248             acpi_has_method(handle, "SBW"))
1249                 return true;
1250
1251         return false;
1252 }
1253
1254 static bool acpi_object_is_system_bus(acpi_handle handle)
1255 {
1256         acpi_handle tmp;
1257
1258         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1259             tmp == handle)
1260                 return true;
1261         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1262             tmp == handle)
1263                 return true;
1264
1265         return false;
1266 }
1267
1268 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1269                                 int device_type)
1270 {
1271         acpi_status status;
1272         struct acpi_device_info *info;
1273         struct acpi_pnp_device_id_list *cid_list;
1274         int i;
1275
1276         switch (device_type) {
1277         case ACPI_BUS_TYPE_DEVICE:
1278                 if (handle == ACPI_ROOT_OBJECT) {
1279                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1280                         break;
1281                 }
1282
1283                 status = acpi_get_object_info(handle, &info);
1284                 if (ACPI_FAILURE(status)) {
1285                         pr_err(PREFIX "%s: Error reading device info\n",
1286                                         __func__);
1287                         return;
1288                 }
1289
1290                 if (info->valid & ACPI_VALID_HID) {
1291                         acpi_add_id(pnp, info->hardware_id.string);
1292                         pnp->type.platform_id = 1;
1293                 }
1294                 if (info->valid & ACPI_VALID_CID) {
1295                         cid_list = &info->compatible_id_list;
1296                         for (i = 0; i < cid_list->count; i++)
1297                                 acpi_add_id(pnp, cid_list->ids[i].string);
1298                 }
1299                 if (info->valid & ACPI_VALID_ADR) {
1300                         pnp->bus_address = info->address;
1301                         pnp->type.bus_address = 1;
1302                 }
1303                 if (info->valid & ACPI_VALID_UID)
1304                         pnp->unique_id = kstrdup(info->unique_id.string,
1305                                                         GFP_KERNEL);
1306                 if (info->valid & ACPI_VALID_CLS)
1307                         acpi_add_id(pnp, info->class_code.string);
1308
1309                 kfree(info);
1310
1311                 /*
1312                  * Some devices don't reliably have _HIDs & _CIDs, so add
1313                  * synthetic HIDs to make sure drivers can find them.
1314                  */
1315                 if (acpi_is_video_device(handle))
1316                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1317                 else if (acpi_bay_match(handle))
1318                         acpi_add_id(pnp, ACPI_BAY_HID);
1319                 else if (acpi_dock_match(handle))
1320                         acpi_add_id(pnp, ACPI_DOCK_HID);
1321                 else if (acpi_ibm_smbus_match(handle))
1322                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1323                 else if (list_empty(&pnp->ids) &&
1324                          acpi_object_is_system_bus(handle)) {
1325                         /* \_SB, \_TZ, LNXSYBUS */
1326                         acpi_add_id(pnp, ACPI_BUS_HID);
1327                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1328                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1329                 }
1330
1331                 break;
1332         case ACPI_BUS_TYPE_POWER:
1333                 acpi_add_id(pnp, ACPI_POWER_HID);
1334                 break;
1335         case ACPI_BUS_TYPE_PROCESSOR:
1336                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1337                 break;
1338         case ACPI_BUS_TYPE_THERMAL:
1339                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1340                 break;
1341         case ACPI_BUS_TYPE_POWER_BUTTON:
1342                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1343                 break;
1344         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1345                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1346                 break;
1347         case ACPI_BUS_TYPE_ECDT_EC:
1348                 acpi_add_id(pnp, ACPI_ECDT_HID);
1349                 break;
1350         }
1351 }
1352
1353 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1354 {
1355         struct acpi_hardware_id *id, *tmp;
1356
1357         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1358                 kfree_const(id->id);
1359                 kfree(id);
1360         }
1361         kfree(pnp->unique_id);
1362 }
1363
1364 /**
1365  * acpi_dma_supported - Check DMA support for the specified device.
1366  * @adev: The pointer to acpi device
1367  *
1368  * Return false if DMA is not supported. Otherwise, return true
1369  */
1370 bool acpi_dma_supported(struct acpi_device *adev)
1371 {
1372         if (!adev)
1373                 return false;
1374
1375         if (adev->flags.cca_seen)
1376                 return true;
1377
1378         /*
1379         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1380         * DMA on "Intel platforms".  Presumably that includes all x86 and
1381         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1382         */
1383         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1384                 return true;
1385
1386         return false;
1387 }
1388
1389 /**
1390  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1391  * @adev: The pointer to acpi device
1392  *
1393  * Return enum dev_dma_attr.
1394  */
1395 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1396 {
1397         if (!acpi_dma_supported(adev))
1398                 return DEV_DMA_NOT_SUPPORTED;
1399
1400         if (adev->flags.coherent_dma)
1401                 return DEV_DMA_COHERENT;
1402         else
1403                 return DEV_DMA_NON_COHERENT;
1404 }
1405
1406 /**
1407  * acpi_dma_get_range() - Get device DMA parameters.
1408  *
1409  * @dev: device to configure
1410  * @dma_addr: pointer device DMA address result
1411  * @offset: pointer to the DMA offset result
1412  * @size: pointer to DMA range size result
1413  *
1414  * Evaluate DMA regions and return respectively DMA region start, offset
1415  * and size in dma_addr, offset and size on parsing success; it does not
1416  * update the passed in values on failure.
1417  *
1418  * Return 0 on success, < 0 on failure.
1419  */
1420 int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1421                        u64 *size)
1422 {
1423         struct acpi_device *adev;
1424         LIST_HEAD(list);
1425         struct resource_entry *rentry;
1426         int ret;
1427         struct device *dma_dev = dev;
1428         u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1429
1430         /*
1431          * Walk the device tree chasing an ACPI companion with a _DMA
1432          * object while we go. Stop if we find a device with an ACPI
1433          * companion containing a _DMA method.
1434          */
1435         do {
1436                 adev = ACPI_COMPANION(dma_dev);
1437                 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1438                         break;
1439
1440                 dma_dev = dma_dev->parent;
1441         } while (dma_dev);
1442
1443         if (!dma_dev)
1444                 return -ENODEV;
1445
1446         if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1447                 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1448                 return -EINVAL;
1449         }
1450
1451         ret = acpi_dev_get_dma_resources(adev, &list);
1452         if (ret > 0) {
1453                 list_for_each_entry(rentry, &list, node) {
1454                         if (dma_offset && rentry->offset != dma_offset) {
1455                                 ret = -EINVAL;
1456                                 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1457                                 goto out;
1458                         }
1459                         dma_offset = rentry->offset;
1460
1461                         /* Take lower and upper limits */
1462                         if (rentry->res->start < dma_start)
1463                                 dma_start = rentry->res->start;
1464                         if (rentry->res->end > dma_end)
1465                                 dma_end = rentry->res->end;
1466                 }
1467
1468                 if (dma_start >= dma_end) {
1469                         ret = -EINVAL;
1470                         dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1471                         goto out;
1472                 }
1473
1474                 *dma_addr = dma_start - dma_offset;
1475                 len = dma_end - dma_start;
1476                 *size = max(len, len + 1);
1477                 *offset = dma_offset;
1478         }
1479  out:
1480         acpi_dev_free_resource_list(&list);
1481
1482         return ret >= 0 ? 0 : ret;
1483 }
1484
1485 /**
1486  * acpi_dma_configure_id - Set-up DMA configuration for the device.
1487  * @dev: The pointer to the device
1488  * @attr: device dma attributes
1489  * @input_id: input device id const value pointer
1490  */
1491 int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1492                           const u32 *input_id)
1493 {
1494         const struct iommu_ops *iommu;
1495         u64 dma_addr = 0, size = 0;
1496
1497         if (attr == DEV_DMA_NOT_SUPPORTED) {
1498                 set_dma_ops(dev, &dma_dummy_ops);
1499                 return 0;
1500         }
1501
1502         iort_dma_setup(dev, &dma_addr, &size);
1503
1504         iommu = iort_iommu_configure_id(dev, input_id);
1505         if (PTR_ERR(iommu) == -EPROBE_DEFER)
1506                 return -EPROBE_DEFER;
1507
1508         arch_setup_dma_ops(dev, dma_addr, size,
1509                                 iommu, attr == DEV_DMA_COHERENT);
1510
1511         return 0;
1512 }
1513 EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1514
1515 static void acpi_init_coherency(struct acpi_device *adev)
1516 {
1517         unsigned long long cca = 0;
1518         acpi_status status;
1519         struct acpi_device *parent = adev->parent;
1520
1521         if (parent && parent->flags.cca_seen) {
1522                 /*
1523                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1524                  * already saw one.
1525                  */
1526                 adev->flags.cca_seen = 1;
1527                 cca = parent->flags.coherent_dma;
1528         } else {
1529                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1530                                                NULL, &cca);
1531                 if (ACPI_SUCCESS(status))
1532                         adev->flags.cca_seen = 1;
1533                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1534                         /*
1535                          * If architecture does not specify that _CCA is
1536                          * required for DMA-able devices (e.g. x86),
1537                          * we default to _CCA=1.
1538                          */
1539                         cca = 1;
1540                 else
1541                         acpi_handle_debug(adev->handle,
1542                                           "ACPI device is missing _CCA.\n");
1543         }
1544
1545         adev->flags.coherent_dma = cca;
1546 }
1547
1548 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1549 {
1550         bool *is_serial_bus_slave_p = data;
1551
1552         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1553                 return 1;
1554
1555         *is_serial_bus_slave_p = true;
1556
1557          /* no need to do more checking */
1558         return -1;
1559 }
1560
1561 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1562 {
1563         struct acpi_device *parent = device->parent;
1564         static const struct acpi_device_id indirect_io_hosts[] = {
1565                 {"HISI0191", 0},
1566                 {}
1567         };
1568
1569         return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1570 }
1571
1572 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1573 {
1574         struct list_head resource_list;
1575         bool is_serial_bus_slave = false;
1576         static const struct acpi_device_id ignore_serial_bus_ids[] = {
1577         /*
1578          * These devices have multiple I2cSerialBus resources and an i2c-client
1579          * must be instantiated for each, each with its own i2c_device_id.
1580          * Normally we only instantiate an i2c-client for the first resource,
1581          * using the ACPI HID as id. These special cases are handled by the
1582          * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
1583          * which i2c_device_id to use for each resource.
1584          */
1585                 {"BSG1160", },
1586                 {"BSG2150", },
1587                 {"INT33FE", },
1588                 {"INT3515", },
1589         /*
1590          * HIDs of device with an UartSerialBusV2 resource for which userspace
1591          * expects a regular tty cdev to be created (instead of the in kernel
1592          * serdev) and which have a kernel driver which expects a platform_dev
1593          * such as the rfkill-gpio driver.
1594          */
1595                 {"BCM4752", },
1596                 {"LNV4752", },
1597                 {}
1598         };
1599
1600         if (acpi_is_indirect_io_slave(device))
1601                 return true;
1602
1603         /* Macs use device properties in lieu of _CRS resources */
1604         if (x86_apple_machine &&
1605             (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1606              fwnode_property_present(&device->fwnode, "i2cAddress") ||
1607              fwnode_property_present(&device->fwnode, "baud")))
1608                 return true;
1609
1610         if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
1611                 return false;
1612
1613         INIT_LIST_HEAD(&resource_list);
1614         acpi_dev_get_resources(device, &resource_list,
1615                                acpi_check_serial_bus_slave,
1616                                &is_serial_bus_slave);
1617         acpi_dev_free_resource_list(&resource_list);
1618
1619         return is_serial_bus_slave;
1620 }
1621
1622 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1623                              int type, unsigned long long sta)
1624 {
1625         INIT_LIST_HEAD(&device->pnp.ids);
1626         device->device_type = type;
1627         device->handle = handle;
1628         device->parent = acpi_bus_get_parent(handle);
1629         device->fwnode.ops = &acpi_device_fwnode_ops;
1630         acpi_set_device_status(device, sta);
1631         acpi_device_get_busid(device);
1632         acpi_set_pnp_ids(handle, &device->pnp, type);
1633         acpi_init_properties(device);
1634         acpi_bus_get_flags(device);
1635         device->flags.match_driver = false;
1636         device->flags.initialized = true;
1637         device->flags.enumeration_by_parent =
1638                 acpi_device_enumeration_by_parent(device);
1639         acpi_device_clear_enumerated(device);
1640         device_initialize(&device->dev);
1641         dev_set_uevent_suppress(&device->dev, true);
1642         acpi_init_coherency(device);
1643         /* Assume there are unmet deps until acpi_device_dep_initialize() runs */
1644         device->dep_unmet = 1;
1645 }
1646
1647 void acpi_device_add_finalize(struct acpi_device *device)
1648 {
1649         dev_set_uevent_suppress(&device->dev, false);
1650         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1651 }
1652
1653 static int acpi_add_single_object(struct acpi_device **child,
1654                                   acpi_handle handle, int type,
1655                                   unsigned long long sta)
1656 {
1657         int result;
1658         struct acpi_device *device;
1659         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1660
1661         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1662         if (!device) {
1663                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1664                 return -ENOMEM;
1665         }
1666
1667         acpi_init_device_object(device, handle, type, sta);
1668         /*
1669          * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so
1670          * that we can call acpi_bus_get_status() and use its quirk handling.
1671          * Note this must be done before the get power-/wakeup_dev-flags calls.
1672          */
1673         if (type == ACPI_BUS_TYPE_DEVICE)
1674                 if (acpi_bus_get_status(device) < 0)
1675                         acpi_set_device_status(device, 0);
1676
1677         acpi_bus_get_power_flags(device);
1678         acpi_bus_get_wakeup_device_flags(device);
1679
1680         result = acpi_device_add(device, acpi_device_release);
1681         if (result) {
1682                 acpi_device_release(&device->dev);
1683                 return result;
1684         }
1685
1686         acpi_power_add_remove_device(device, true);
1687         acpi_device_add_finalize(device);
1688         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1689         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1690                 dev_name(&device->dev), (char *) buffer.pointer,
1691                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1692         kfree(buffer.pointer);
1693         *child = device;
1694         return 0;
1695 }
1696
1697 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1698                                             void *context)
1699 {
1700         struct resource *res = context;
1701
1702         if (acpi_dev_resource_memory(ares, res))
1703                 return AE_CTRL_TERMINATE;
1704
1705         return AE_OK;
1706 }
1707
1708 static bool acpi_device_should_be_hidden(acpi_handle handle)
1709 {
1710         acpi_status status;
1711         struct resource res;
1712
1713         /* Check if it should ignore the UART device */
1714         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1715                 return false;
1716
1717         /*
1718          * The UART device described in SPCR table is assumed to have only one
1719          * memory resource present. So we only look for the first one here.
1720          */
1721         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1722                                      acpi_get_resource_memory, &res);
1723         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1724                 return false;
1725
1726         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1727                          &res.start);
1728
1729         return true;
1730 }
1731
1732 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1733                                     unsigned long long *sta)
1734 {
1735         acpi_status status;
1736         acpi_object_type acpi_type;
1737
1738         status = acpi_get_type(handle, &acpi_type);
1739         if (ACPI_FAILURE(status))
1740                 return -ENODEV;
1741
1742         switch (acpi_type) {
1743         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1744         case ACPI_TYPE_DEVICE:
1745                 if (acpi_device_should_be_hidden(handle))
1746                         return -ENODEV;
1747
1748                 *type = ACPI_BUS_TYPE_DEVICE;
1749                 /*
1750                  * acpi_add_single_object updates this once we've an acpi_device
1751                  * so that acpi_bus_get_status' quirk handling can be used.
1752                  */
1753                 *sta = ACPI_STA_DEFAULT;
1754                 break;
1755         case ACPI_TYPE_PROCESSOR:
1756                 *type = ACPI_BUS_TYPE_PROCESSOR;
1757                 status = acpi_bus_get_status_handle(handle, sta);
1758                 if (ACPI_FAILURE(status))
1759                         return -ENODEV;
1760                 break;
1761         case ACPI_TYPE_THERMAL:
1762                 *type = ACPI_BUS_TYPE_THERMAL;
1763                 *sta = ACPI_STA_DEFAULT;
1764                 break;
1765         case ACPI_TYPE_POWER:
1766                 *type = ACPI_BUS_TYPE_POWER;
1767                 *sta = ACPI_STA_DEFAULT;
1768                 break;
1769         default:
1770                 return -ENODEV;
1771         }
1772
1773         return 0;
1774 }
1775
1776 bool acpi_device_is_present(const struct acpi_device *adev)
1777 {
1778         return adev->status.present || adev->status.functional;
1779 }
1780
1781 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1782                                        const char *idstr,
1783                                        const struct acpi_device_id **matchid)
1784 {
1785         const struct acpi_device_id *devid;
1786
1787         if (handler->match)
1788                 return handler->match(idstr, matchid);
1789
1790         for (devid = handler->ids; devid->id[0]; devid++)
1791                 if (!strcmp((char *)devid->id, idstr)) {
1792                         if (matchid)
1793                                 *matchid = devid;
1794
1795                         return true;
1796                 }
1797
1798         return false;
1799 }
1800
1801 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1802                                         const struct acpi_device_id **matchid)
1803 {
1804         struct acpi_scan_handler *handler;
1805
1806         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1807                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1808                         return handler;
1809
1810         return NULL;
1811 }
1812
1813 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1814 {
1815         if (!!hotplug->enabled == !!val)
1816                 return;
1817
1818         mutex_lock(&acpi_scan_lock);
1819
1820         hotplug->enabled = val;
1821
1822         mutex_unlock(&acpi_scan_lock);
1823 }
1824
1825 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1826 {
1827         struct acpi_hardware_id *hwid;
1828
1829         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1830                 acpi_dock_add(adev);
1831                 return;
1832         }
1833         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1834                 struct acpi_scan_handler *handler;
1835
1836                 handler = acpi_scan_match_handler(hwid->id, NULL);
1837                 if (handler) {
1838                         adev->flags.hotplug_notify = true;
1839                         break;
1840                 }
1841         }
1842 }
1843
1844 static void acpi_device_dep_initialize(struct acpi_device *adev)
1845 {
1846         struct acpi_dep_data *dep;
1847         struct acpi_handle_list dep_devices;
1848         acpi_status status;
1849         int i;
1850
1851         adev->dep_unmet = 0;
1852
1853         if (!acpi_has_method(adev->handle, "_DEP"))
1854                 return;
1855
1856         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1857                                         &dep_devices);
1858         if (ACPI_FAILURE(status)) {
1859                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1860                 return;
1861         }
1862
1863         for (i = 0; i < dep_devices.count; i++) {
1864                 struct acpi_device_info *info;
1865                 int skip;
1866
1867                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1868                 if (ACPI_FAILURE(status)) {
1869                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1870                         continue;
1871                 }
1872
1873                 /*
1874                  * Skip the dependency of Windows System Power
1875                  * Management Controller
1876                  */
1877                 skip = info->valid & ACPI_VALID_HID &&
1878                         !strcmp(info->hardware_id.string, "INT3396");
1879
1880                 kfree(info);
1881
1882                 if (skip)
1883                         continue;
1884
1885                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1886                 if (!dep)
1887                         return;
1888
1889                 dep->master = dep_devices.handles[i];
1890                 dep->slave  = adev->handle;
1891                 adev->dep_unmet++;
1892
1893                 mutex_lock(&acpi_dep_list_lock);
1894                 list_add_tail(&dep->node , &acpi_dep_list);
1895                 mutex_unlock(&acpi_dep_list_lock);
1896         }
1897 }
1898
1899 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1900                                       void *not_used, void **return_value)
1901 {
1902         struct acpi_device *device = NULL;
1903         int type;
1904         unsigned long long sta;
1905         int result;
1906
1907         acpi_bus_get_device(handle, &device);
1908         if (device)
1909                 goto out;
1910
1911         result = acpi_bus_type_and_status(handle, &type, &sta);
1912         if (result)
1913                 return AE_OK;
1914
1915         if (type == ACPI_BUS_TYPE_POWER) {
1916                 acpi_add_power_resource(handle);
1917                 return AE_OK;
1918         }
1919
1920         acpi_add_single_object(&device, handle, type, sta);
1921         if (!device)
1922                 return AE_CTRL_DEPTH;
1923
1924         acpi_scan_init_hotplug(device);
1925         acpi_device_dep_initialize(device);
1926
1927  out:
1928         if (!*return_value)
1929                 *return_value = device;
1930
1931         return AE_OK;
1932 }
1933
1934 static void acpi_default_enumeration(struct acpi_device *device)
1935 {
1936         /*
1937          * Do not enumerate devices with enumeration_by_parent flag set as
1938          * they will be enumerated by their respective parents.
1939          */
1940         if (!device->flags.enumeration_by_parent) {
1941                 acpi_create_platform_device(device, NULL);
1942                 acpi_device_set_enumerated(device);
1943         } else {
1944                 blocking_notifier_call_chain(&acpi_reconfig_chain,
1945                                              ACPI_RECONFIG_DEVICE_ADD, device);
1946         }
1947 }
1948
1949 static const struct acpi_device_id generic_device_ids[] = {
1950         {ACPI_DT_NAMESPACE_HID, },
1951         {"", },
1952 };
1953
1954 static int acpi_generic_device_attach(struct acpi_device *adev,
1955                                       const struct acpi_device_id *not_used)
1956 {
1957         /*
1958          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1959          * below can be unconditional.
1960          */
1961         if (adev->data.of_compatible)
1962                 acpi_default_enumeration(adev);
1963
1964         return 1;
1965 }
1966
1967 static struct acpi_scan_handler generic_device_handler = {
1968         .ids = generic_device_ids,
1969         .attach = acpi_generic_device_attach,
1970 };
1971
1972 static int acpi_scan_attach_handler(struct acpi_device *device)
1973 {
1974         struct acpi_hardware_id *hwid;
1975         int ret = 0;
1976
1977         list_for_each_entry(hwid, &device->pnp.ids, list) {
1978                 const struct acpi_device_id *devid;
1979                 struct acpi_scan_handler *handler;
1980
1981                 handler = acpi_scan_match_handler(hwid->id, &devid);
1982                 if (handler) {
1983                         if (!handler->attach) {
1984                                 device->pnp.type.platform_id = 0;
1985                                 continue;
1986                         }
1987                         device->handler = handler;
1988                         ret = handler->attach(device, devid);
1989                         if (ret > 0)
1990                                 break;
1991
1992                         device->handler = NULL;
1993                         if (ret < 0)
1994                                 break;
1995                 }
1996         }
1997
1998         return ret;
1999 }
2000
2001 static void acpi_bus_attach(struct acpi_device *device)
2002 {
2003         struct acpi_device *child;
2004         acpi_handle ejd;
2005         int ret;
2006
2007         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2008                 register_dock_dependent_device(device, ejd);
2009
2010         acpi_bus_get_status(device);
2011         /* Skip devices that are not present. */
2012         if (!acpi_device_is_present(device)) {
2013                 device->flags.initialized = false;
2014                 acpi_device_clear_enumerated(device);
2015                 device->flags.power_manageable = 0;
2016                 return;
2017         }
2018         if (device->handler)
2019                 goto ok;
2020
2021         if (!device->flags.initialized) {
2022                 device->flags.power_manageable =
2023                         device->power.states[ACPI_STATE_D0].flags.valid;
2024                 if (acpi_bus_init_power(device))
2025                         device->flags.power_manageable = 0;
2026
2027                 device->flags.initialized = true;
2028         } else if (device->flags.visited) {
2029                 goto ok;
2030         }
2031
2032         ret = acpi_scan_attach_handler(device);
2033         if (ret < 0)
2034                 return;
2035
2036         device->flags.match_driver = true;
2037         if (ret > 0 && !device->flags.enumeration_by_parent) {
2038                 acpi_device_set_enumerated(device);
2039                 goto ok;
2040         }
2041
2042         ret = device_attach(&device->dev);
2043         if (ret < 0)
2044                 return;
2045
2046         if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2047                 acpi_default_enumeration(device);
2048         else
2049                 acpi_device_set_enumerated(device);
2050
2051  ok:
2052         list_for_each_entry(child, &device->children, node)
2053                 acpi_bus_attach(child);
2054
2055         if (device->handler && device->handler->hotplug.notify_online)
2056                 device->handler->hotplug.notify_online(device);
2057 }
2058
2059 void acpi_walk_dep_device_list(acpi_handle handle)
2060 {
2061         struct acpi_dep_data *dep, *tmp;
2062         struct acpi_device *adev;
2063
2064         mutex_lock(&acpi_dep_list_lock);
2065         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2066                 if (dep->master == handle) {
2067                         acpi_bus_get_device(dep->slave, &adev);
2068                         if (!adev)
2069                                 continue;
2070
2071                         adev->dep_unmet--;
2072                         if (!adev->dep_unmet)
2073                                 acpi_bus_attach(adev);
2074                         list_del(&dep->node);
2075                         kfree(dep);
2076                 }
2077         }
2078         mutex_unlock(&acpi_dep_list_lock);
2079 }
2080 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2081
2082 /**
2083  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2084  * @handle: Root of the namespace scope to scan.
2085  *
2086  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2087  * found devices.
2088  *
2089  * If no devices were found, -ENODEV is returned, but it does not mean that
2090  * there has been a real error.  There just have been no suitable ACPI objects
2091  * in the table trunk from which the kernel could create a device and add an
2092  * appropriate driver.
2093  *
2094  * Must be called under acpi_scan_lock.
2095  */
2096 int acpi_bus_scan(acpi_handle handle)
2097 {
2098         void *device = NULL;
2099
2100         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2101                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2102                                     acpi_bus_check_add, NULL, NULL, &device);
2103
2104         if (device) {
2105                 acpi_bus_attach(device);
2106                 return 0;
2107         }
2108         return -ENODEV;
2109 }
2110 EXPORT_SYMBOL(acpi_bus_scan);
2111
2112 /**
2113  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2114  * @adev: Root of the ACPI namespace scope to walk.
2115  *
2116  * Must be called under acpi_scan_lock.
2117  */
2118 void acpi_bus_trim(struct acpi_device *adev)
2119 {
2120         struct acpi_scan_handler *handler = adev->handler;
2121         struct acpi_device *child;
2122
2123         list_for_each_entry_reverse(child, &adev->children, node)
2124                 acpi_bus_trim(child);
2125
2126         adev->flags.match_driver = false;
2127         if (handler) {
2128                 if (handler->detach)
2129                         handler->detach(adev);
2130
2131                 adev->handler = NULL;
2132         } else {
2133                 device_release_driver(&adev->dev);
2134         }
2135         /*
2136          * Most likely, the device is going away, so put it into D3cold before
2137          * that.
2138          */
2139         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2140         adev->flags.initialized = false;
2141         acpi_device_clear_enumerated(adev);
2142 }
2143 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2144
2145 int acpi_bus_register_early_device(int type)
2146 {
2147         struct acpi_device *device = NULL;
2148         int result;
2149
2150         result = acpi_add_single_object(&device, NULL,
2151                                         type, ACPI_STA_DEFAULT);
2152         if (result)
2153                 return result;
2154
2155         device->flags.match_driver = true;
2156         return device_attach(&device->dev);
2157 }
2158 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2159
2160 static int acpi_bus_scan_fixed(void)
2161 {
2162         int result = 0;
2163
2164         /*
2165          * Enumerate all fixed-feature devices.
2166          */
2167         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2168                 struct acpi_device *device = NULL;
2169
2170                 result = acpi_add_single_object(&device, NULL,
2171                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2172                                                 ACPI_STA_DEFAULT);
2173                 if (result)
2174                         return result;
2175
2176                 device->flags.match_driver = true;
2177                 result = device_attach(&device->dev);
2178                 if (result < 0)
2179                         return result;
2180
2181                 device_init_wakeup(&device->dev, true);
2182         }
2183
2184         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2185                 struct acpi_device *device = NULL;
2186
2187                 result = acpi_add_single_object(&device, NULL,
2188                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2189                                                 ACPI_STA_DEFAULT);
2190                 if (result)
2191                         return result;
2192
2193                 device->flags.match_driver = true;
2194                 result = device_attach(&device->dev);
2195         }
2196
2197         return result < 0 ? result : 0;
2198 }
2199
2200 static void __init acpi_get_spcr_uart_addr(void)
2201 {
2202         acpi_status status;
2203         struct acpi_table_spcr *spcr_ptr;
2204
2205         status = acpi_get_table(ACPI_SIG_SPCR, 0,
2206                                 (struct acpi_table_header **)&spcr_ptr);
2207         if (ACPI_FAILURE(status)) {
2208                 pr_warn(PREFIX "STAO table present, but SPCR is missing\n");
2209                 return;
2210         }
2211
2212         spcr_uart_addr = spcr_ptr->serial_port.address;
2213         acpi_put_table((struct acpi_table_header *)spcr_ptr);
2214 }
2215
2216 static bool acpi_scan_initialized;
2217
2218 int __init acpi_scan_init(void)
2219 {
2220         int result;
2221         acpi_status status;
2222         struct acpi_table_stao *stao_ptr;
2223
2224         acpi_pci_root_init();
2225         acpi_pci_link_init();
2226         acpi_processor_init();
2227         acpi_platform_init();
2228         acpi_lpss_init();
2229         acpi_apd_init();
2230         acpi_cmos_rtc_init();
2231         acpi_container_init();
2232         acpi_memory_hotplug_init();
2233         acpi_watchdog_init();
2234         acpi_pnp_init();
2235         acpi_int340x_thermal_init();
2236         acpi_amba_init();
2237         acpi_init_lpit();
2238
2239         acpi_scan_add_handler(&generic_device_handler);
2240
2241         /*
2242          * If there is STAO table, check whether it needs to ignore the UART
2243          * device in SPCR table.
2244          */
2245         status = acpi_get_table(ACPI_SIG_STAO, 0,
2246                                 (struct acpi_table_header **)&stao_ptr);
2247         if (ACPI_SUCCESS(status)) {
2248                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2249                         pr_info(PREFIX "STAO Name List not yet supported.\n");
2250
2251                 if (stao_ptr->ignore_uart)
2252                         acpi_get_spcr_uart_addr();
2253
2254                 acpi_put_table((struct acpi_table_header *)stao_ptr);
2255         }
2256
2257         acpi_gpe_apply_masked_gpes();
2258         acpi_update_all_gpes();
2259
2260         /*
2261          * Although we call __add_memory() that is documented to require the
2262          * device_hotplug_lock, it is not necessary here because this is an
2263          * early code when userspace or any other code path cannot trigger
2264          * hotplug/hotunplug operations.
2265          */
2266         mutex_lock(&acpi_scan_lock);
2267         /*
2268          * Enumerate devices in the ACPI namespace.
2269          */
2270         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2271         if (result)
2272                 goto out;
2273
2274         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2275         if (result)
2276                 goto out;
2277
2278         /* Fixed feature devices do not exist on HW-reduced platform */
2279         if (!acpi_gbl_reduced_hardware) {
2280                 result = acpi_bus_scan_fixed();
2281                 if (result) {
2282                         acpi_detach_data(acpi_root->handle,
2283                                          acpi_scan_drop_device);
2284                         acpi_device_del(acpi_root);
2285                         put_device(&acpi_root->dev);
2286                         goto out;
2287                 }
2288         }
2289
2290         acpi_scan_initialized = true;
2291
2292  out:
2293         mutex_unlock(&acpi_scan_lock);
2294         return result;
2295 }
2296
2297 static struct acpi_probe_entry *ape;
2298 static int acpi_probe_count;
2299 static DEFINE_MUTEX(acpi_probe_mutex);
2300
2301 static int __init acpi_match_madt(union acpi_subtable_headers *header,
2302                                   const unsigned long end)
2303 {
2304         if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2305                 if (!ape->probe_subtbl(header, end))
2306                         acpi_probe_count++;
2307
2308         return 0;
2309 }
2310
2311 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2312 {
2313         int count = 0;
2314
2315         if (acpi_disabled)
2316                 return 0;
2317
2318         mutex_lock(&acpi_probe_mutex);
2319         for (ape = ap_head; nr; ape++, nr--) {
2320                 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2321                         acpi_probe_count = 0;
2322                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2323                         count += acpi_probe_count;
2324                 } else {
2325                         int res;
2326                         res = acpi_table_parse(ape->id, ape->probe_table);
2327                         if (!res)
2328                                 count++;
2329                 }
2330         }
2331         mutex_unlock(&acpi_probe_mutex);
2332
2333         return count;
2334 }
2335
2336 struct acpi_table_events_work {
2337         struct work_struct work;
2338         void *table;
2339         u32 event;
2340 };
2341
2342 static void acpi_table_events_fn(struct work_struct *work)
2343 {
2344         struct acpi_table_events_work *tew;
2345
2346         tew = container_of(work, struct acpi_table_events_work, work);
2347
2348         if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2349                 acpi_scan_lock_acquire();
2350                 acpi_bus_scan(ACPI_ROOT_OBJECT);
2351                 acpi_scan_lock_release();
2352         }
2353
2354         kfree(tew);
2355 }
2356
2357 void acpi_scan_table_handler(u32 event, void *table, void *context)
2358 {
2359         struct acpi_table_events_work *tew;
2360
2361         if (!acpi_scan_initialized)
2362                 return;
2363
2364         if (event != ACPI_TABLE_EVENT_LOAD)
2365                 return;
2366
2367         tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2368         if (!tew)
2369                 return;
2370
2371         INIT_WORK(&tew->work, acpi_table_events_fn);
2372         tew->table = table;
2373         tew->event = event;
2374
2375         schedule_work(&tew->work);
2376 }
2377
2378 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2379 {
2380         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2381 }
2382 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2383
2384 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2385 {
2386         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2387 }
2388 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);