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_warn(&adev->dev, "Already enumerated\n");
 325                         return -EALREADY;
 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                 if (!adev->handler) {
 333                         dev_warn(&adev->dev, "Enumeration failure\n");
 334                         error = -ENODEV;
 335                 }
 336         } else {
 337                 error = acpi_scan_device_not_present(adev);
 338         }
 339         return error;
 340 }
 341
 342 static int acpi_scan_bus_check(struct acpi_device *adev)
 343 {
 344         struct acpi_scan_handler *handler = adev->handler;
 345         struct acpi_device *child;
 346         int error;
 347
 348         acpi_bus_get_status(adev);
 349         if (!(adev->status.present || adev->status.functional)) {
 350                 acpi_scan_device_not_present(adev);
 351                 return 0;
 352         }
 353         if (handler && handler->hotplug.scan_dependent)
 354                 return handler->hotplug.scan_dependent(adev);
 355
 356         error = acpi_bus_scan(adev->handle);
 357         if (error) {
 358                 dev_warn(&adev->dev, "Namespace scan failure\n");
 359                 return error;
 360         }
 361         list_for_each_entry(child, &adev->children, node) {
 362                 error = acpi_scan_bus_check(child);
 363                 if (error)
 364                         return error;
 365         }
 366         return 0;
 367 }
 368
 369 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 370 {
 371         switch (type) {
 372         case ACPI_NOTIFY_BUS_CHECK:
 373                 return acpi_scan_bus_check(adev);
 374         case ACPI_NOTIFY_DEVICE_CHECK:
 375                 return acpi_scan_device_check(adev);
 376         case ACPI_NOTIFY_EJECT_REQUEST:
 377         case ACPI_OST_EC_OSPM_EJECT:
 378                 if (adev->handler && !adev->handler->hotplug.enabled) {
 379                         dev_info(&adev->dev, "Eject disabled\n");
 380                         return -EPERM;
 381                 }
 382                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 383                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 384                 return acpi_scan_hot_remove(adev);
 385         }
 386         return -EINVAL;
 387 }
 388
 389 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 390 {
 391         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 392         int error = -ENODEV;
 393
 394         lock_device_hotplug();
 395         mutex_lock(&acpi_scan_lock);
 396
 397         /*
 398          * The device object's ACPI handle cannot become invalid as long as we
 399          * are holding acpi_scan_lock, but it might have become invalid before
 400          * that lock was acquired.
 401          */
 402         if (adev->handle == INVALID_ACPI_HANDLE)
 403                 goto err_out;
 404
 405         if (adev->flags.is_dock_station) {
 406                 error = dock_notify(adev, src);
 407         } else if (adev->flags.hotplug_notify) {
 408                 error = acpi_generic_hotplug_event(adev, src);
 409         } else {
 410                 int (*notify)(struct acpi_device *, u32);
 411
 412                 acpi_lock_hp_context();
 413                 notify = adev->hp ? adev->hp->notify : NULL;
 414                 acpi_unlock_hp_context();
 415                 /*
 416                  * There may be additional notify handlers for device objects
 417                  * without the .event() callback, so ignore them here.
 418                  */
 419                 if (notify)
 420                         error = notify(adev, src);
 421                 else
 422                         goto out;
 423         }
 424         switch (error) {
 425         case 0:
 426                 ost_code = ACPI_OST_SC_SUCCESS;
 427                 break;
 428         case -EPERM:
 429                 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 430                 break;
 431         case -EBUSY:
 432                 ost_code = ACPI_OST_SC_DEVICE_BUSY;
 433                 break;
 434         default:
 435                 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 436                 break;
 437         }
 438
 439  err_out:
 440         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 441
 442  out:
 443         acpi_bus_put_acpi_device(adev);
 444         mutex_unlock(&acpi_scan_lock);
 445         unlock_device_hotplug();
 446 }
 447
 448 static void acpi_free_power_resources_lists(struct acpi_device *device)
 449 {
 450         int i;
 451
 452         if (device->wakeup.flags.valid)
 453                 acpi_power_resources_list_free(&device->wakeup.resources);
 454
 455         if (!device->power.flags.power_resources)
 456                 return;
 457
 458         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 459                 struct acpi_device_power_state *ps = &device->power.states[i];
 460                 acpi_power_resources_list_free(&ps->resources);
 461         }
 462 }
 463
 464 static void acpi_device_release(struct device *dev)
 465 {
 466         struct acpi_device *acpi_dev = to_acpi_device(dev);
 467
 468         acpi_free_properties(acpi_dev);
 469         acpi_free_pnp_ids(&acpi_dev->pnp);
 470         acpi_free_power_resources_lists(acpi_dev);
 471         kfree(acpi_dev);
 472 }
 473
 474 static void acpi_device_del(struct acpi_device *device)
 475 {
 476         struct acpi_device_bus_id *acpi_device_bus_id;
 477
 478         mutex_lock(&acpi_device_lock);
 479         if (device->parent)
 480                 list_del(&device->node);
 481
 482         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
 483                 if (!strcmp(acpi_device_bus_id->bus_id,
 484                             acpi_device_hid(device))) {
 485                         ida_simple_remove(&acpi_device_bus_id->instance_ida, device->pnp.instance_no);
 486                         if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
 487                                 list_del(&acpi_device_bus_id->node);
 488                                 kfree_const(acpi_device_bus_id->bus_id);
 489                                 kfree(acpi_device_bus_id);
 490                         }
 491                         break;
 492                 }
 493
 494         list_del(&device->wakeup_list);
 495         mutex_unlock(&acpi_device_lock);
 496
 497         acpi_power_add_remove_device(device, false);
 498         acpi_device_remove_files(device);
 499         if (device->remove)
 500                 device->remove(device);
 501
 502         device_del(&device->dev);
 503 }
 504
 505 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
 506
 507 static LIST_HEAD(acpi_device_del_list);
 508 static DEFINE_MUTEX(acpi_device_del_lock);
 509
 510 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 511 {
 512         for (;;) {
 513                 struct acpi_device *adev;
 514
 515                 mutex_lock(&acpi_device_del_lock);
 516
 517                 if (list_empty(&acpi_device_del_list)) {
 518                         mutex_unlock(&acpi_device_del_lock);
 519                         break;
 520                 }
 521                 adev = list_first_entry(&acpi_device_del_list,
 522                                         struct acpi_device, del_list);
 523                 list_del(&adev->del_list);
 524
 525                 mutex_unlock(&acpi_device_del_lock);
 526
 527                 blocking_notifier_call_chain(&acpi_reconfig_chain,
 528                                              ACPI_RECONFIG_DEVICE_REMOVE, adev);
 529
 530                 acpi_device_del(adev);
 531                 /*
 532                  * Drop references to all power resources that might have been
 533                  * used by the device.
 534                  */
 535                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
 536                 put_device(&adev->dev);
 537         }
 538 }
 539
 540 /**
 541  * acpi_scan_drop_device - Drop an ACPI device object.
 542  * @handle: Handle of an ACPI namespace node, not used.
 543  * @context: Address of the ACPI device object to drop.
 544  *
 545  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
 546  * namespace node the device object pointed to by @context is attached to.
 547  *
 548  * The unregistration is carried out asynchronously to avoid running
 549  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
 550  * ensure the correct ordering (the device objects must be unregistered in the
 551  * same order in which the corresponding namespace nodes are deleted).
 552  */
 553 static void acpi_scan_drop_device(acpi_handle handle, void *context)
 554 {
 555         static DECLARE_WORK(work, acpi_device_del_work_fn);
 556         struct acpi_device *adev = context;
 557
 558         mutex_lock(&acpi_device_del_lock);
 559
 560         /*
 561          * Use the ACPI hotplug workqueue which is ordered, so this work item
 562          * won't run after any hotplug work items submitted subsequently.  That
 563          * prevents attempts to register device objects identical to those being
 564          * deleted from happening concurrently (such attempts result from
 565          * hotplug events handled via the ACPI hotplug workqueue).  It also will
 566          * run after all of the work items submitted previosuly, which helps
 567          * those work items to ensure that they are not accessing stale device
 568          * objects.
 569          */
 570         if (list_empty(&acpi_device_del_list))
 571                 acpi_queue_hotplug_work(&work);
 572
 573         list_add_tail(&adev->del_list, &acpi_device_del_list);
 574         /* Make acpi_ns_validate_handle() return NULL for this handle. */
 575         adev->handle = INVALID_ACPI_HANDLE;
 576
 577         mutex_unlock(&acpi_device_del_lock);
 578 }
 579
 580 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
 581                                 void (*callback)(void *))
 582 {
 583         acpi_status status;
 584
 585         if (!device)
 586                 return -EINVAL;
 587
 588         *device = NULL;
 589
 590         status = acpi_get_data_full(handle, acpi_scan_drop_device,
 591                                     (void **)device, callback);
 592         if (ACPI_FAILURE(status) || !*device) {
 593                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 594                                   handle));
 595                 return -ENODEV;
 596         }
 597         return 0;
 598 }
 599
 600 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 601 {
 602         return acpi_get_device_data(handle, device, NULL);
 603 }
 604 EXPORT_SYMBOL(acpi_bus_get_device);
 605
 606 static void get_acpi_device(void *dev)
 607 {
 608         if (dev)
 609                 get_device(&((struct acpi_device *)dev)->dev);
 610 }
 611
 612 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 613 {
 614         struct acpi_device *adev = NULL;
 615
 616         acpi_get_device_data(handle, &adev, get_acpi_device);
 617         return adev;
 618 }
 619
 620 void acpi_bus_put_acpi_device(struct acpi_device *adev)
 621 {
 622         put_device(&adev->dev);
 623 }
 624
 625 static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
 626 {
 627         struct acpi_device_bus_id *acpi_device_bus_id;
 628
 629         /* Find suitable bus_id and instance number in acpi_bus_id_list. */
 630         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 631                 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
 632                         return acpi_device_bus_id;
 633         }
 634         return NULL;
 635 }
 636
 637 static int acpi_device_set_name(struct acpi_device *device,
 638                                 struct acpi_device_bus_id *acpi_device_bus_id)
 639 {
 640         struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
 641         int result;
 642
 643         result = ida_simple_get(instance_ida, 0, ACPI_MAX_DEVICE_INSTANCES, GFP_KERNEL);
 644         if (result < 0)
 645                 return result;
 646
 647         device->pnp.instance_no = result;
 648         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
 649         return 0;
 650 }
 651
 652 int acpi_device_add(struct acpi_device *device,
 653                     void (*release)(struct device *))
 654 {
 655         struct acpi_device_bus_id *acpi_device_bus_id;
 656         int result;
 657
 658         if (device->handle) {
 659                 acpi_status status;
 660
 661                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
 662                                           device);
 663                 if (ACPI_FAILURE(status)) {
 664                         acpi_handle_err(device->handle,
 665                                         "Unable to attach device data\n");
 666                         return -ENODEV;
 667                 }
 668         }
 669
 670         /*
 671          * Linkage
 672          * -------
 673          * Link this device to its parent and siblings.
 674          */
 675         INIT_LIST_HEAD(&device->children);
 676         INIT_LIST_HEAD(&device->node);
 677         INIT_LIST_HEAD(&device->wakeup_list);
 678         INIT_LIST_HEAD(&device->physical_node_list);
 679         INIT_LIST_HEAD(&device->del_list);
 680         mutex_init(&device->physical_node_lock);
 681
 682         mutex_lock(&acpi_device_lock);
 683
 684         acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
 685         if (acpi_device_bus_id) {
 686                 result = acpi_device_set_name(device, acpi_device_bus_id);
 687                 if (result)
 688                         goto err_unlock;
 689         } else {
 690                 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
 691                                              GFP_KERNEL);
 692                 if (!acpi_device_bus_id) {
 693                         result = -ENOMEM;
 694                         goto err_unlock;
 695                 }
 696                 acpi_device_bus_id->bus_id =
 697                         kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
 698                 if (!acpi_device_bus_id->bus_id) {
 699                         kfree(acpi_device_bus_id);
 700                         result = -ENOMEM;
 701                         goto err_unlock;
 702                 }
 703
 704                 ida_init(&acpi_device_bus_id->instance_ida);
 705
 706                 result = acpi_device_set_name(device, acpi_device_bus_id);
 707                 if (result) {
 708                         kfree_const(acpi_device_bus_id->bus_id);
 709                         kfree(acpi_device_bus_id);
 710                         goto err_unlock;
 711                 }
 712
 713                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 714         }
 715
 716         if (device->parent)
 717                 list_add_tail(&device->node, &device->parent->children);
 718
 719         if (device->wakeup.flags.valid)
 720                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 721         mutex_unlock(&acpi_device_lock);
 722
 723         if (device->parent)
 724                 device->dev.parent = &device->parent->dev;
 725         device->dev.bus = &acpi_bus_type;
 726         device->dev.release = release;
 727         result = device_add(&device->dev);
 728         if (result) {
 729                 dev_err(&device->dev, "Error registering device\n");
 730                 goto err;
 731         }
 732
 733         result = acpi_device_setup_files(device);
 734         if (result)
 735                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 736                        dev_name(&device->dev));
 737
 738         return 0;
 739
 740  err:
 741         mutex_lock(&acpi_device_lock);
 742         if (device->parent)
 743                 list_del(&device->node);
 744         list_del(&device->wakeup_list);
 745
 746  err_unlock:
 747         mutex_unlock(&acpi_device_lock);
 748
 749         acpi_detach_data(device->handle, acpi_scan_drop_device);
 750         return result;
 751 }
 752
 753 /* --------------------------------------------------------------------------
 754                                  Device Enumeration
 755    -------------------------------------------------------------------------- */
 756 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 757 {
 758         struct acpi_device *device = NULL;
 759         acpi_status status;
 760
 761         /*
 762          * Fixed hardware devices do not appear in the namespace and do not
 763          * have handles, but we fabricate acpi_devices for them, so we have
 764          * to deal with them specially.
 765          */
 766         if (!handle)
 767                 return acpi_root;
 768
 769         do {
 770                 status = acpi_get_parent(handle, &handle);
 771                 if (ACPI_FAILURE(status))
 772                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 773         } while (acpi_bus_get_device(handle, &device));
 774         return device;
 775 }
 776
 777 acpi_status
 778 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 779 {
 780         acpi_status status;
 781         acpi_handle tmp;
 782         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 783         union acpi_object *obj;
 784
 785         status = acpi_get_handle(handle, "_EJD", &tmp);
 786         if (ACPI_FAILURE(status))
 787                 return status;
 788
 789         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 790         if (ACPI_SUCCESS(status)) {
 791                 obj = buffer.pointer;
 792                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 793                                          ejd);
 794                 kfree(buffer.pointer);
 795         }
 796         return status;
 797 }
 798 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 799
 800 static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
 801 {
 802         acpi_handle handle = dev->handle;
 803         struct acpi_device_wakeup *wakeup = &dev->wakeup;
 804         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 805         union acpi_object *package = NULL;
 806         union acpi_object *element = NULL;
 807         acpi_status status;
 808         int err = -ENODATA;
 809
 810         INIT_LIST_HEAD(&wakeup->resources);
 811
 812         /* _PRW */
 813         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 814         if (ACPI_FAILURE(status)) {
 815                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 816                 return err;
 817         }
 818
 819         package = (union acpi_object *)buffer.pointer;
 820
 821         if (!package || package->package.count < 2)
 822                 goto out;
 823
 824         element = &(package->package.elements[0]);
 825         if (!element)
 826                 goto out;
 827
 828         if (element->type == ACPI_TYPE_PACKAGE) {
 829                 if ((element->package.count < 2) ||
 830                     (element->package.elements[0].type !=
 831                      ACPI_TYPE_LOCAL_REFERENCE)
 832                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 833                         goto out;
 834
 835                 wakeup->gpe_device =
 836                     element->package.elements[0].reference.handle;
 837                 wakeup->gpe_number =
 838                     (u32) element->package.elements[1].integer.value;
 839         } else if (element->type == ACPI_TYPE_INTEGER) {
 840                 wakeup->gpe_device = NULL;
 841                 wakeup->gpe_number = element->integer.value;
 842         } else {
 843                 goto out;
 844         }
 845
 846         element = &(package->package.elements[1]);
 847         if (element->type != ACPI_TYPE_INTEGER)
 848                 goto out;
 849
 850         wakeup->sleep_state = element->integer.value;
 851
 852         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 853         if (err)
 854                 goto out;
 855
 856         if (!list_empty(&wakeup->resources)) {
 857                 int sleep_state;
 858
 859                 err = acpi_power_wakeup_list_init(&wakeup->resources,
 860                                                   &sleep_state);
 861                 if (err) {
 862                         acpi_handle_warn(handle, "Retrieving current states "
 863                                          "of wakeup power resources failed\n");
 864                         acpi_power_resources_list_free(&wakeup->resources);
 865                         goto out;
 866                 }
 867                 if (sleep_state < wakeup->sleep_state) {
 868                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
 869                                          "(S%d) by S%d from power resources\n",
 870                                          (int)wakeup->sleep_state, sleep_state);
 871                         wakeup->sleep_state = sleep_state;
 872                 }
 873         }
 874
 875  out:
 876         kfree(buffer.pointer);
 877         return err;
 878 }
 879
 880 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
 881 {
 882         static const struct acpi_device_id button_device_ids[] = {
 883                 {"PNP0C0C", 0},         /* Power button */
 884                 {"PNP0C0D", 0},         /* Lid */
 885                 {"PNP0C0E", 0},         /* Sleep button */
 886                 {"", 0},
 887         };
 888         struct acpi_device_wakeup *wakeup = &device->wakeup;
 889         acpi_status status;
 890
 891         wakeup->flags.notifier_present = 0;
 892
 893         /* Power button, Lid switch always enable wakeup */
 894         if (!acpi_match_device_ids(device, button_device_ids)) {
 895                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 896                         /* Do not use Lid/sleep button for S5 wakeup */
 897                         if (wakeup->sleep_state == ACPI_STATE_S5)
 898                                 wakeup->sleep_state = ACPI_STATE_S4;
 899                 }
 900                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 901                 device_set_wakeup_capable(&device->dev, true);
 902                 return true;
 903         }
 904
 905         status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 906                                          wakeup->gpe_number);
 907         return ACPI_SUCCESS(status);
 908 }
 909
 910 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 911 {
 912         int err;
 913
 914         /* Presence of _PRW indicates wake capable */
 915         if (!acpi_has_method(device->handle, "_PRW"))
 916                 return;
 917
 918         err = acpi_bus_extract_wakeup_device_power_package(device);
 919         if (err) {
 920                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
 921                 return;
 922         }
 923
 924         device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
 925         device->wakeup.prepare_count = 0;
 926         /*
 927          * Call _PSW/_DSW object to disable its ability to wake the sleeping
 928          * system for the ACPI device with the _PRW object.
 929          * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
 930          * So it is necessary to call _DSW object first. Only when it is not
 931          * present will the _PSW object used.
 932          */
 933         err = acpi_device_sleep_wake(device, 0, 0, 0);
 934         if (err)
 935                 pr_debug("error in _DSW or _PSW evaluation\n");
 936 }
 937
 938 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 939 {
 940         struct acpi_device_power_state *ps = &device->power.states[state];
 941         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 942         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 943         acpi_status status;
 944
 945         INIT_LIST_HEAD(&ps->resources);
 946
 947         /* Evaluate "_PRx" to get referenced power resources */
 948         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 949         if (ACPI_SUCCESS(status)) {
 950                 union acpi_object *package = buffer.pointer;
 951
 952                 if (buffer.length && package
 953                     && package->type == ACPI_TYPE_PACKAGE
 954                     && package->package.count)
 955                         acpi_extract_power_resources(package, 0, &ps->resources);
 956
 957                 ACPI_FREE(buffer.pointer);
 958         }
 959
 960         /* Evaluate "_PSx" to see if we can do explicit sets */
 961         pathname[2] = 'S';
 962         if (acpi_has_method(device->handle, pathname))
 963                 ps->flags.explicit_set = 1;
 964
 965         /* State is valid if there are means to put the device into it. */
 966         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
 967                 ps->flags.valid = 1;
 968
 969         ps->power = -1;         /* Unknown - driver assigned */
 970         ps->latency = -1;       /* Unknown - driver assigned */
 971 }
 972
 973 static void acpi_bus_get_power_flags(struct acpi_device *device)
 974 {
 975         u32 i;
 976
 977         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 978         if (!acpi_has_method(device->handle, "_PS0") &&
 979             !acpi_has_method(device->handle, "_PR0"))
 980                 return;
 981
 982         device->flags.power_manageable = 1;
 983
 984         /*
 985          * Power Management Flags
 986          */
 987         if (acpi_has_method(device->handle, "_PSC"))
 988                 device->power.flags.explicit_get = 1;
 989
 990         if (acpi_has_method(device->handle, "_IRC"))
 991                 device->power.flags.inrush_current = 1;
 992
 993         if (acpi_has_method(device->handle, "_DSW"))
 994                 device->power.flags.dsw_present = 1;
 995
 996         /*
 997          * Enumerate supported power management states
 998          */
 999         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1000                 acpi_bus_init_power_state(device, i);
1001
1002         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1003
1004         /* Set the defaults for D0 and D3hot (always supported). */
1005         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1006         device->power.states[ACPI_STATE_D0].power = 100;
1007         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1008
1009         /*
1010          * Use power resources only if the D0 list of them is populated, because
1011          * some platforms may provide _PR3 only to indicate D3cold support and
1012          * in those cases the power resources list returned by it may be bogus.
1013          */
1014         if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1015                 device->power.flags.power_resources = 1;
1016                 /*
1017                  * D3cold is supported if the D3hot list of power resources is
1018                  * not empty.
1019                  */
1020                 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1021                         device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1022         }
1023
1024         if (acpi_bus_init_power(device))
1025                 device->flags.power_manageable = 0;
1026 }
1027
1028 static void acpi_bus_get_flags(struct acpi_device *device)
1029 {
1030         /* Presence of _STA indicates 'dynamic_status' */
1031         if (acpi_has_method(device->handle, "_STA"))
1032                 device->flags.dynamic_status = 1;
1033
1034         /* Presence of _RMV indicates 'removable' */
1035         if (acpi_has_method(device->handle, "_RMV"))
1036                 device->flags.removable = 1;
1037
1038         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1039         if (acpi_has_method(device->handle, "_EJD") ||
1040             acpi_has_method(device->handle, "_EJ0"))
1041                 device->flags.ejectable = 1;
1042 }
1043
1044 static void acpi_device_get_busid(struct acpi_device *device)
1045 {
1046         char bus_id[5] = { '?', 0 };
1047         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1048         int i = 0;
1049
1050         /*
1051          * Bus ID
1052          * ------
1053          * The device's Bus ID is simply the object name.
1054          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1055          */
1056         if (ACPI_IS_ROOT_DEVICE(device)) {
1057                 strcpy(device->pnp.bus_id, "ACPI");
1058                 return;
1059         }
1060
1061         switch (device->device_type) {
1062         case ACPI_BUS_TYPE_POWER_BUTTON:
1063                 strcpy(device->pnp.bus_id, "PWRF");
1064                 break;
1065         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1066                 strcpy(device->pnp.bus_id, "SLPF");
1067                 break;
1068         case ACPI_BUS_TYPE_ECDT_EC:
1069                 strcpy(device->pnp.bus_id, "ECDT");
1070                 break;
1071         default:
1072                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1073                 /* Clean up trailing underscores (if any) */
1074                 for (i = 3; i > 1; i--) {
1075                         if (bus_id[i] == '_')
1076                                 bus_id[i] = '\0';
1077                         else
1078                                 break;
1079                 }
1080                 strcpy(device->pnp.bus_id, bus_id);
1081                 break;
1082         }
1083 }
1084
1085 /*
1086  * acpi_ata_match - see if an acpi object is an ATA device
1087  *
1088  * If an acpi object has one of the ACPI ATA methods defined,
1089  * then we can safely call it an ATA device.
1090  */
1091 bool acpi_ata_match(acpi_handle handle)
1092 {
1093         return acpi_has_method(handle, "_GTF") ||
1094                acpi_has_method(handle, "_GTM") ||
1095                acpi_has_method(handle, "_STM") ||
1096                acpi_has_method(handle, "_SDD");
1097 }
1098
1099 /*
1100  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1101  *
1102  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1103  * then we can safely call it an ejectable drive bay
1104  */
1105 bool acpi_bay_match(acpi_handle handle)
1106 {
1107         acpi_handle phandle;
1108
1109         if (!acpi_has_method(handle, "_EJ0"))
1110                 return false;
1111         if (acpi_ata_match(handle))
1112                 return true;
1113         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1114                 return false;
1115
1116         return acpi_ata_match(phandle);
1117 }
1118
1119 bool acpi_device_is_battery(struct acpi_device *adev)
1120 {
1121         struct acpi_hardware_id *hwid;
1122
1123         list_for_each_entry(hwid, &adev->pnp.ids, list)
1124                 if (!strcmp("PNP0C0A", hwid->id))
1125                         return true;
1126
1127         return false;
1128 }
1129
1130 static bool is_ejectable_bay(struct acpi_device *adev)
1131 {
1132         acpi_handle handle = adev->handle;
1133
1134         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1135                 return true;
1136
1137         return acpi_bay_match(handle);
1138 }
1139
1140 /*
1141  * acpi_dock_match - see if an acpi object has a _DCK method
1142  */
1143 bool acpi_dock_match(acpi_handle handle)
1144 {
1145         return acpi_has_method(handle, "_DCK");
1146 }
1147
1148 static acpi_status
1149 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1150                           void **return_value)
1151 {
1152         long *cap = context;
1153
1154         if (acpi_has_method(handle, "_BCM") &&
1155             acpi_has_method(handle, "_BCL")) {
1156                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1157                                   "support\n"));
1158                 *cap |= ACPI_VIDEO_BACKLIGHT;
1159                 /* We have backlight support, no need to scan further */
1160                 return AE_CTRL_TERMINATE;
1161         }
1162         return 0;
1163 }
1164
1165 /* Returns true if the ACPI object is a video device which can be
1166  * handled by video.ko.
1167  * The device will get a Linux specific CID added in scan.c to
1168  * identify the device as an ACPI graphics device
1169  * Be aware that the graphics device may not be physically present
1170  * Use acpi_video_get_capabilities() to detect general ACPI video
1171  * capabilities of present cards
1172  */
1173 long acpi_is_video_device(acpi_handle handle)
1174 {
1175         long video_caps = 0;
1176
1177         /* Is this device able to support video switching ? */
1178         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1179                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1180
1181         /* Is this device able to retrieve a video ROM ? */
1182         if (acpi_has_method(handle, "_ROM"))
1183                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1184
1185         /* Is this device able to configure which video head to be POSTed ? */
1186         if (acpi_has_method(handle, "_VPO") &&
1187             acpi_has_method(handle, "_GPD") &&
1188             acpi_has_method(handle, "_SPD"))
1189                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1190
1191         /* Only check for backlight functionality if one of the above hit. */
1192         if (video_caps)
1193                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1194                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1195                                     &video_caps, NULL);
1196
1197         return video_caps;
1198 }
1199 EXPORT_SYMBOL(acpi_is_video_device);
1200
1201 const char *acpi_device_hid(struct acpi_device *device)
1202 {
1203         struct acpi_hardware_id *hid;
1204
1205         if (list_empty(&device->pnp.ids))
1206                 return dummy_hid;
1207
1208         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1209         return hid->id;
1210 }
1211 EXPORT_SYMBOL(acpi_device_hid);
1212
1213 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1214 {
1215         struct acpi_hardware_id *id;
1216
1217         id = kmalloc(sizeof(*id), GFP_KERNEL);
1218         if (!id)
1219                 return;
1220
1221         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1222         if (!id->id) {
1223                 kfree(id);
1224                 return;
1225         }
1226
1227         list_add_tail(&id->list, &pnp->ids);
1228         pnp->type.hardware_id = 1;
1229 }
1230
1231 /*
1232  * Old IBM workstations have a DSDT bug wherein the SMBus object
1233  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1234  * prefix.  Work around this.
1235  */
1236 static bool acpi_ibm_smbus_match(acpi_handle handle)
1237 {
1238         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1239         struct acpi_buffer path = { sizeof(node_name), node_name };
1240
1241         if (!dmi_name_in_vendors("IBM"))
1242                 return false;
1243
1244         /* Look for SMBS object */
1245         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1246             strcmp("SMBS", path.pointer))
1247                 return false;
1248
1249         /* Does it have the necessary (but misnamed) methods? */
1250         if (acpi_has_method(handle, "SBI") &&
1251             acpi_has_method(handle, "SBR") &&
1252             acpi_has_method(handle, "SBW"))
1253                 return true;
1254
1255         return false;
1256 }
1257
1258 static bool acpi_object_is_system_bus(acpi_handle handle)
1259 {
1260         acpi_handle tmp;
1261
1262         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1263             tmp == handle)
1264                 return true;
1265         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1266             tmp == handle)
1267                 return true;
1268
1269         return false;
1270 }
1271
1272 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1273                                 int device_type)
1274 {
1275         acpi_status status;
1276         struct acpi_device_info *info;
1277         struct acpi_pnp_device_id_list *cid_list;
1278         int i;
1279
1280         switch (device_type) {
1281         case ACPI_BUS_TYPE_DEVICE:
1282                 if (handle == ACPI_ROOT_OBJECT) {
1283                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1284                         break;
1285                 }
1286
1287                 status = acpi_get_object_info(handle, &info);
1288                 if (ACPI_FAILURE(status)) {
1289                         pr_err(PREFIX "%s: Error reading device info\n",
1290                                         __func__);
1291                         return;
1292                 }
1293
1294                 if (info->valid & ACPI_VALID_HID) {
1295                         acpi_add_id(pnp, info->hardware_id.string);
1296                         pnp->type.platform_id = 1;
1297                 }
1298                 if (info->valid & ACPI_VALID_CID) {
1299                         cid_list = &info->compatible_id_list;
1300                         for (i = 0; i < cid_list->count; i++)
1301                                 acpi_add_id(pnp, cid_list->ids[i].string);
1302                 }
1303                 if (info->valid & ACPI_VALID_ADR) {
1304                         pnp->bus_address = info->address;
1305                         pnp->type.bus_address = 1;
1306                 }
1307                 if (info->valid & ACPI_VALID_UID)
1308                         pnp->unique_id = kstrdup(info->unique_id.string,
1309                                                         GFP_KERNEL);
1310                 if (info->valid & ACPI_VALID_CLS)
1311                         acpi_add_id(pnp, info->class_code.string);
1312
1313                 kfree(info);
1314
1315                 /*
1316                  * Some devices don't reliably have _HIDs & _CIDs, so add
1317                  * synthetic HIDs to make sure drivers can find them.
1318                  */
1319                 if (acpi_is_video_device(handle))
1320                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1321                 else if (acpi_bay_match(handle))
1322                         acpi_add_id(pnp, ACPI_BAY_HID);
1323                 else if (acpi_dock_match(handle))
1324                         acpi_add_id(pnp, ACPI_DOCK_HID);
1325                 else if (acpi_ibm_smbus_match(handle))
1326                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1327                 else if (list_empty(&pnp->ids) &&
1328                          acpi_object_is_system_bus(handle)) {
1329                         /* \_SB, \_TZ, LNXSYBUS */
1330                         acpi_add_id(pnp, ACPI_BUS_HID);
1331                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1332                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1333                 }
1334
1335                 break;
1336         case ACPI_BUS_TYPE_POWER:
1337                 acpi_add_id(pnp, ACPI_POWER_HID);
1338                 break;
1339         case ACPI_BUS_TYPE_PROCESSOR:
1340                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1341                 break;
1342         case ACPI_BUS_TYPE_THERMAL:
1343                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1344                 break;
1345         case ACPI_BUS_TYPE_POWER_BUTTON:
1346                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1347                 break;
1348         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1349                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1350                 break;
1351         case ACPI_BUS_TYPE_ECDT_EC:
1352                 acpi_add_id(pnp, ACPI_ECDT_HID);
1353                 break;
1354         }
1355 }
1356
1357 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1358 {
1359         struct acpi_hardware_id *id, *tmp;
1360
1361         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1362                 kfree_const(id->id);
1363                 kfree(id);
1364         }
1365         kfree(pnp->unique_id);
1366 }
1367
1368 /**
1369  * acpi_dma_supported - Check DMA support for the specified device.
1370  * @adev: The pointer to acpi device
1371  *
1372  * Return false if DMA is not supported. Otherwise, return true
1373  */
1374 bool acpi_dma_supported(struct acpi_device *adev)
1375 {
1376         if (!adev)
1377                 return false;
1378
1379         if (adev->flags.cca_seen)
1380                 return true;
1381
1382         /*
1383         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1384         * DMA on "Intel platforms".  Presumably that includes all x86 and
1385         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1386         */
1387         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1388                 return true;
1389
1390         return false;
1391 }
1392
1393 /**
1394  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1395  * @adev: The pointer to acpi device
1396  *
1397  * Return enum dev_dma_attr.
1398  */
1399 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1400 {
1401         if (!acpi_dma_supported(adev))
1402                 return DEV_DMA_NOT_SUPPORTED;
1403
1404         if (adev->flags.coherent_dma)
1405                 return DEV_DMA_COHERENT;
1406         else
1407                 return DEV_DMA_NON_COHERENT;
1408 }
1409
1410 /**
1411  * acpi_dma_get_range() - Get device DMA parameters.
1412  *
1413  * @dev: device to configure
1414  * @dma_addr: pointer device DMA address result
1415  * @offset: pointer to the DMA offset result
1416  * @size: pointer to DMA range size result
1417  *
1418  * Evaluate DMA regions and return respectively DMA region start, offset
1419  * and size in dma_addr, offset and size on parsing success; it does not
1420  * update the passed in values on failure.
1421  *
1422  * Return 0 on success, < 0 on failure.
1423  */
1424 int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1425                        u64 *size)
1426 {
1427         struct acpi_device *adev;
1428         LIST_HEAD(list);
1429         struct resource_entry *rentry;
1430         int ret;
1431         struct device *dma_dev = dev;
1432         u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1433
1434         /*
1435          * Walk the device tree chasing an ACPI companion with a _DMA
1436          * object while we go. Stop if we find a device with an ACPI
1437          * companion containing a _DMA method.
1438          */
1439         do {
1440                 adev = ACPI_COMPANION(dma_dev);
1441                 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1442                         break;
1443
1444                 dma_dev = dma_dev->parent;
1445         } while (dma_dev);
1446
1447         if (!dma_dev)
1448                 return -ENODEV;
1449
1450         if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1451                 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1452                 return -EINVAL;
1453         }
1454
1455         ret = acpi_dev_get_dma_resources(adev, &list);
1456         if (ret > 0) {
1457                 list_for_each_entry(rentry, &list, node) {
1458                         if (dma_offset && rentry->offset != dma_offset) {
1459                                 ret = -EINVAL;
1460                                 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1461                                 goto out;
1462                         }
1463                         dma_offset = rentry->offset;
1464
1465                         /* Take lower and upper limits */
1466                         if (rentry->res->start < dma_start)
1467                                 dma_start = rentry->res->start;
1468                         if (rentry->res->end > dma_end)
1469                                 dma_end = rentry->res->end;
1470                 }
1471
1472                 if (dma_start >= dma_end) {
1473                         ret = -EINVAL;
1474                         dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1475                         goto out;
1476                 }
1477
1478                 *dma_addr = dma_start - dma_offset;
1479                 len = dma_end - dma_start;
1480                 *size = max(len, len + 1);
1481                 *offset = dma_offset;
1482         }
1483  out:
1484         acpi_dev_free_resource_list(&list);
1485
1486         return ret >= 0 ? 0 : ret;
1487 }
1488
1489 /**
1490  * acpi_dma_configure_id - Set-up DMA configuration for the device.
1491  * @dev: The pointer to the device
1492  * @attr: device dma attributes
1493  * @input_id: input device id const value pointer
1494  */
1495 int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1496                           const u32 *input_id)
1497 {
1498         const struct iommu_ops *iommu;
1499         u64 dma_addr = 0, size = 0;
1500
1501         if (attr == DEV_DMA_NOT_SUPPORTED) {
1502                 set_dma_ops(dev, &dma_dummy_ops);
1503                 return 0;
1504         }
1505
1506         iort_dma_setup(dev, &dma_addr, &size);
1507
1508         iommu = iort_iommu_configure_id(dev, input_id);
1509         if (PTR_ERR(iommu) == -EPROBE_DEFER)
1510                 return -EPROBE_DEFER;
1511
1512         arch_setup_dma_ops(dev, dma_addr, size,
1513                                 iommu, attr == DEV_DMA_COHERENT);
1514
1515         return 0;
1516 }
1517 EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1518
1519 static void acpi_init_coherency(struct acpi_device *adev)
1520 {
1521         unsigned long long cca = 0;
1522         acpi_status status;
1523         struct acpi_device *parent = adev->parent;
1524
1525         if (parent && parent->flags.cca_seen) {
1526                 /*
1527                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1528                  * already saw one.
1529                  */
1530                 adev->flags.cca_seen = 1;
1531                 cca = parent->flags.coherent_dma;
1532         } else {
1533                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1534                                                NULL, &cca);
1535                 if (ACPI_SUCCESS(status))
1536                         adev->flags.cca_seen = 1;
1537                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1538                         /*
1539                          * If architecture does not specify that _CCA is
1540                          * required for DMA-able devices (e.g. x86),
1541                          * we default to _CCA=1.
1542                          */
1543                         cca = 1;
1544                 else
1545                         acpi_handle_debug(adev->handle,
1546                                           "ACPI device is missing _CCA.\n");
1547         }
1548
1549         adev->flags.coherent_dma = cca;
1550 }
1551
1552 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1553 {
1554         bool *is_serial_bus_slave_p = data;
1555
1556         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1557                 return 1;
1558
1559         *is_serial_bus_slave_p = true;
1560
1561          /* no need to do more checking */
1562         return -1;
1563 }
1564
1565 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1566 {
1567         struct acpi_device *parent = device->parent;
1568         static const struct acpi_device_id indirect_io_hosts[] = {
1569                 {"HISI0191", 0},
1570                 {}
1571         };
1572
1573         return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1574 }
1575
1576 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1577 {
1578         struct list_head resource_list;
1579         bool is_serial_bus_slave = false;
1580         static const struct acpi_device_id ignore_serial_bus_ids[] = {
1581         /*
1582          * These devices have multiple I2cSerialBus resources and an i2c-client
1583          * must be instantiated for each, each with its own i2c_device_id.
1584          * Normally we only instantiate an i2c-client for the first resource,
1585          * using the ACPI HID as id. These special cases are handled by the
1586          * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
1587          * which i2c_device_id to use for each resource.
1588          */
1589                 {"BSG1160", },
1590                 {"BSG2150", },
1591                 {"INT33FE", },
1592                 {"INT3515", },
1593         /*
1594          * HIDs of device with an UartSerialBusV2 resource for which userspace
1595          * expects a regular tty cdev to be created (instead of the in kernel
1596          * serdev) and which have a kernel driver which expects a platform_dev
1597          * such as the rfkill-gpio driver.
1598          */
1599                 {"BCM4752", },
1600                 {"LNV4752", },
1601                 {}
1602         };
1603
1604         if (acpi_is_indirect_io_slave(device))
1605                 return true;
1606
1607         /* Macs use device properties in lieu of _CRS resources */
1608         if (x86_apple_machine &&
1609             (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1610              fwnode_property_present(&device->fwnode, "i2cAddress") ||
1611              fwnode_property_present(&device->fwnode, "baud")))
1612                 return true;
1613
1614         if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
1615                 return false;
1616
1617         INIT_LIST_HEAD(&resource_list);
1618         acpi_dev_get_resources(device, &resource_list,
1619                                acpi_check_serial_bus_slave,
1620                                &is_serial_bus_slave);
1621         acpi_dev_free_resource_list(&resource_list);
1622
1623         return is_serial_bus_slave;
1624 }
1625
1626 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1627                              int type, unsigned long long sta)
1628 {
1629         INIT_LIST_HEAD(&device->pnp.ids);
1630         device->device_type = type;
1631         device->handle = handle;
1632         device->parent = acpi_bus_get_parent(handle);
1633         device->fwnode.ops = &acpi_device_fwnode_ops;
1634         acpi_set_device_status(device, sta);
1635         acpi_device_get_busid(device);
1636         acpi_set_pnp_ids(handle, &device->pnp, type);
1637         acpi_init_properties(device);
1638         acpi_bus_get_flags(device);
1639         device->flags.match_driver = false;
1640         device->flags.initialized = true;
1641         device->flags.enumeration_by_parent =
1642                 acpi_device_enumeration_by_parent(device);
1643         acpi_device_clear_enumerated(device);
1644         device_initialize(&device->dev);
1645         dev_set_uevent_suppress(&device->dev, true);
1646         acpi_init_coherency(device);
1647         /* Assume there are unmet deps until acpi_device_dep_initialize() runs */
1648         device->dep_unmet = 1;
1649 }
1650
1651 void acpi_device_add_finalize(struct acpi_device *device)
1652 {
1653         dev_set_uevent_suppress(&device->dev, false);
1654         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1655 }
1656
1657 static int acpi_add_single_object(struct acpi_device **child,
1658                                   acpi_handle handle, int type,
1659                                   unsigned long long sta)
1660 {
1661         int result;
1662         struct acpi_device *device;
1663         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1664
1665         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1666         if (!device) {
1667                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1668                 return -ENOMEM;
1669         }
1670
1671         acpi_init_device_object(device, handle, type, sta);
1672         /*
1673          * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so
1674          * that we can call acpi_bus_get_status() and use its quirk handling.
1675          * Note this must be done before the get power-/wakeup_dev-flags calls.
1676          */
1677         if (type == ACPI_BUS_TYPE_DEVICE)
1678                 if (acpi_bus_get_status(device) < 0)
1679                         acpi_set_device_status(device, 0);
1680
1681         acpi_bus_get_power_flags(device);
1682         acpi_bus_get_wakeup_device_flags(device);
1683
1684         result = acpi_device_add(device, acpi_device_release);
1685         if (result) {
1686                 acpi_device_release(&device->dev);
1687                 return result;
1688         }
1689
1690         acpi_power_add_remove_device(device, true);
1691         acpi_device_add_finalize(device);
1692         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1693         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1694                 dev_name(&device->dev), (char *) buffer.pointer,
1695                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1696         kfree(buffer.pointer);
1697         *child = device;
1698         return 0;
1699 }
1700
1701 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1702                                             void *context)
1703 {
1704         struct resource *res = context;
1705
1706         if (acpi_dev_resource_memory(ares, res))
1707                 return AE_CTRL_TERMINATE;
1708
1709         return AE_OK;
1710 }
1711
1712 static bool acpi_device_should_be_hidden(acpi_handle handle)
1713 {
1714         acpi_status status;
1715         struct resource res;
1716
1717         /* Check if it should ignore the UART device */
1718         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1719                 return false;
1720
1721         /*
1722          * The UART device described in SPCR table is assumed to have only one
1723          * memory resource present. So we only look for the first one here.
1724          */
1725         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1726                                      acpi_get_resource_memory, &res);
1727         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1728                 return false;
1729
1730         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1731                          &res.start);
1732
1733         return true;
1734 }
1735
1736 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1737                                     unsigned long long *sta)
1738 {
1739         acpi_status status;
1740         acpi_object_type acpi_type;
1741
1742         status = acpi_get_type(handle, &acpi_type);
1743         if (ACPI_FAILURE(status))
1744                 return -ENODEV;
1745
1746         switch (acpi_type) {
1747         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1748         case ACPI_TYPE_DEVICE:
1749                 if (acpi_device_should_be_hidden(handle))
1750                         return -ENODEV;
1751
1752                 *type = ACPI_BUS_TYPE_DEVICE;
1753                 /*
1754                  * acpi_add_single_object updates this once we've an acpi_device
1755                  * so that acpi_bus_get_status' quirk handling can be used.
1756                  */
1757                 *sta = ACPI_STA_DEFAULT;
1758                 break;
1759         case ACPI_TYPE_PROCESSOR:
1760                 *type = ACPI_BUS_TYPE_PROCESSOR;
1761                 status = acpi_bus_get_status_handle(handle, sta);
1762                 if (ACPI_FAILURE(status))
1763                         return -ENODEV;
1764                 break;
1765         case ACPI_TYPE_THERMAL:
1766                 *type = ACPI_BUS_TYPE_THERMAL;
1767                 *sta = ACPI_STA_DEFAULT;
1768                 break;
1769         case ACPI_TYPE_POWER:
1770                 *type = ACPI_BUS_TYPE_POWER;
1771                 *sta = ACPI_STA_DEFAULT;
1772                 break;
1773         default:
1774                 return -ENODEV;
1775         }
1776
1777         return 0;
1778 }
1779
1780 bool acpi_device_is_present(const struct acpi_device *adev)
1781 {
1782         return adev->status.present || adev->status.functional;
1783 }
1784
1785 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1786                                        const char *idstr,
1787                                        const struct acpi_device_id **matchid)
1788 {
1789         const struct acpi_device_id *devid;
1790
1791         if (handler->match)
1792                 return handler->match(idstr, matchid);
1793
1794         for (devid = handler->ids; devid->id[0]; devid++)
1795                 if (!strcmp((char *)devid->id, idstr)) {
1796                         if (matchid)
1797                                 *matchid = devid;
1798
1799                         return true;
1800                 }
1801
1802         return false;
1803 }
1804
1805 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1806                                         const struct acpi_device_id **matchid)
1807 {
1808         struct acpi_scan_handler *handler;
1809
1810         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1811                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1812                         return handler;
1813
1814         return NULL;
1815 }
1816
1817 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1818 {
1819         if (!!hotplug->enabled == !!val)
1820                 return;
1821
1822         mutex_lock(&acpi_scan_lock);
1823
1824         hotplug->enabled = val;
1825
1826         mutex_unlock(&acpi_scan_lock);
1827 }
1828
1829 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1830 {
1831         struct acpi_hardware_id *hwid;
1832
1833         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1834                 acpi_dock_add(adev);
1835                 return;
1836         }
1837         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1838                 struct acpi_scan_handler *handler;
1839
1840                 handler = acpi_scan_match_handler(hwid->id, NULL);
1841                 if (handler) {
1842                         adev->flags.hotplug_notify = true;
1843                         break;
1844                 }
1845         }
1846 }
1847
1848 static void acpi_device_dep_initialize(struct acpi_device *adev)
1849 {
1850         struct acpi_dep_data *dep;
1851         struct acpi_handle_list dep_devices;
1852         acpi_status status;
1853         int i;
1854
1855         adev->dep_unmet = 0;
1856
1857         if (!acpi_has_method(adev->handle, "_DEP"))
1858                 return;
1859
1860         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1861                                         &dep_devices);
1862         if (ACPI_FAILURE(status)) {
1863                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1864                 return;
1865         }
1866
1867         for (i = 0; i < dep_devices.count; i++) {
1868                 struct acpi_device_info *info;
1869                 int skip;
1870
1871                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1872                 if (ACPI_FAILURE(status)) {
1873                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1874                         continue;
1875                 }
1876
1877                 /*
1878                  * Skip the dependency of Windows System Power
1879                  * Management Controller
1880                  */
1881                 skip = info->valid & ACPI_VALID_HID &&
1882                         !strcmp(info->hardware_id.string, "INT3396");
1883
1884                 kfree(info);
1885
1886                 if (skip)
1887                         continue;
1888
1889                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1890                 if (!dep)
1891                         return;
1892
1893                 dep->master = dep_devices.handles[i];
1894                 dep->slave  = adev->handle;
1895                 adev->dep_unmet++;
1896
1897                 mutex_lock(&acpi_dep_list_lock);
1898                 list_add_tail(&dep->node , &acpi_dep_list);
1899                 mutex_unlock(&acpi_dep_list_lock);
1900         }
1901 }
1902
1903 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1904                                       void *not_used, void **return_value)
1905 {
1906         struct acpi_device *device = NULL;
1907         int type;
1908         unsigned long long sta;
1909         int result;
1910
1911         acpi_bus_get_device(handle, &device);
1912         if (device)
1913                 goto out;
1914
1915         result = acpi_bus_type_and_status(handle, &type, &sta);
1916         if (result)
1917                 return AE_OK;
1918
1919         if (type == ACPI_BUS_TYPE_POWER) {
1920                 acpi_add_power_resource(handle);
1921                 return AE_OK;
1922         }
1923
1924         acpi_add_single_object(&device, handle, type, sta);
1925         if (!device)
1926                 return AE_CTRL_DEPTH;
1927
1928         acpi_scan_init_hotplug(device);
1929         acpi_device_dep_initialize(device);
1930
1931  out:
1932         if (!*return_value)
1933                 *return_value = device;
1934
1935         return AE_OK;
1936 }
1937
1938 static void acpi_default_enumeration(struct acpi_device *device)
1939 {
1940         /*
1941          * Do not enumerate devices with enumeration_by_parent flag set as
1942          * they will be enumerated by their respective parents.
1943          */
1944         if (!device->flags.enumeration_by_parent) {
1945                 acpi_create_platform_device(device, NULL);
1946                 acpi_device_set_enumerated(device);
1947         } else {
1948                 blocking_notifier_call_chain(&acpi_reconfig_chain,
1949                                              ACPI_RECONFIG_DEVICE_ADD, device);
1950         }
1951 }
1952
1953 static const struct acpi_device_id generic_device_ids[] = {
1954         {ACPI_DT_NAMESPACE_HID, },
1955         {"", },
1956 };
1957
1958 static int acpi_generic_device_attach(struct acpi_device *adev,
1959                                       const struct acpi_device_id *not_used)
1960 {
1961         /*
1962          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1963          * below can be unconditional.
1964          */
1965         if (adev->data.of_compatible)
1966                 acpi_default_enumeration(adev);
1967
1968         return 1;
1969 }
1970
1971 static struct acpi_scan_handler generic_device_handler = {
1972         .ids = generic_device_ids,
1973         .attach = acpi_generic_device_attach,
1974 };
1975
1976 static int acpi_scan_attach_handler(struct acpi_device *device)
1977 {
1978         struct acpi_hardware_id *hwid;
1979         int ret = 0;
1980
1981         list_for_each_entry(hwid, &device->pnp.ids, list) {
1982                 const struct acpi_device_id *devid;
1983                 struct acpi_scan_handler *handler;
1984
1985                 handler = acpi_scan_match_handler(hwid->id, &devid);
1986                 if (handler) {
1987                         if (!handler->attach) {
1988                                 device->pnp.type.platform_id = 0;
1989                                 continue;
1990                         }
1991                         device->handler = handler;
1992                         ret = handler->attach(device, devid);
1993                         if (ret > 0)
1994                                 break;
1995
1996                         device->handler = NULL;
1997                         if (ret < 0)
1998                                 break;
1999                 }
2000         }
2001
2002         return ret;
2003 }
2004
2005 static void acpi_bus_attach(struct acpi_device *device)
2006 {
2007         struct acpi_device *child;
2008         acpi_handle ejd;
2009         int ret;
2010
2011         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2012                 register_dock_dependent_device(device, ejd);
2013
2014         acpi_bus_get_status(device);
2015         /* Skip devices that are not present. */
2016         if (!acpi_device_is_present(device)) {
2017                 device->flags.initialized = false;
2018                 acpi_device_clear_enumerated(device);
2019                 device->flags.power_manageable = 0;
2020                 return;
2021         }
2022         if (device->handler)
2023                 goto ok;
2024
2025         if (!device->flags.initialized) {
2026                 device->flags.power_manageable =
2027                         device->power.states[ACPI_STATE_D0].flags.valid;
2028                 if (acpi_bus_init_power(device))
2029                         device->flags.power_manageable = 0;
2030
2031                 device->flags.initialized = true;
2032         } else if (device->flags.visited) {
2033                 goto ok;
2034         }
2035
2036         ret = acpi_scan_attach_handler(device);
2037         if (ret < 0)
2038                 return;
2039
2040         device->flags.match_driver = true;
2041         if (ret > 0 && !device->flags.enumeration_by_parent) {
2042                 acpi_device_set_enumerated(device);
2043                 goto ok;
2044         }
2045
2046         ret = device_attach(&device->dev);
2047         if (ret < 0)
2048                 return;
2049
2050         if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2051                 acpi_default_enumeration(device);
2052         else
2053                 acpi_device_set_enumerated(device);
2054
2055  ok:
2056         list_for_each_entry(child, &device->children, node)
2057                 acpi_bus_attach(child);
2058
2059         if (device->handler && device->handler->hotplug.notify_online)
2060                 device->handler->hotplug.notify_online(device);
2061 }
2062
2063 void acpi_walk_dep_device_list(acpi_handle handle)
2064 {
2065         struct acpi_dep_data *dep, *tmp;
2066         struct acpi_device *adev;
2067
2068         mutex_lock(&acpi_dep_list_lock);
2069         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2070                 if (dep->master == handle) {
2071                         acpi_bus_get_device(dep->slave, &adev);
2072                         if (!adev)
2073                                 continue;
2074
2075                         adev->dep_unmet--;
2076                         if (!adev->dep_unmet)
2077                                 acpi_bus_attach(adev);
2078                         list_del(&dep->node);
2079                         kfree(dep);
2080                 }
2081         }
2082         mutex_unlock(&acpi_dep_list_lock);
2083 }
2084 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2085
2086 /**
2087  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2088  * @handle: Root of the namespace scope to scan.
2089  *
2090  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2091  * found devices.
2092  *
2093  * If no devices were found, -ENODEV is returned, but it does not mean that
2094  * there has been a real error.  There just have been no suitable ACPI objects
2095  * in the table trunk from which the kernel could create a device and add an
2096  * appropriate driver.
2097  *
2098  * Must be called under acpi_scan_lock.
2099  */
2100 int acpi_bus_scan(acpi_handle handle)
2101 {
2102         void *device = NULL;
2103
2104         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2105                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2106                                     acpi_bus_check_add, NULL, NULL, &device);
2107
2108         if (device) {
2109                 acpi_bus_attach(device);
2110                 return 0;
2111         }
2112         return -ENODEV;
2113 }
2114 EXPORT_SYMBOL(acpi_bus_scan);
2115
2116 /**
2117  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2118  * @adev: Root of the ACPI namespace scope to walk.
2119  *
2120  * Must be called under acpi_scan_lock.
2121  */
2122 void acpi_bus_trim(struct acpi_device *adev)
2123 {
2124         struct acpi_scan_handler *handler = adev->handler;
2125         struct acpi_device *child;
2126
2127         list_for_each_entry_reverse(child, &adev->children, node)
2128                 acpi_bus_trim(child);
2129
2130         adev->flags.match_driver = false;
2131         if (handler) {
2132                 if (handler->detach)
2133                         handler->detach(adev);
2134
2135                 adev->handler = NULL;
2136         } else {
2137                 device_release_driver(&adev->dev);
2138         }
2139         /*
2140          * Most likely, the device is going away, so put it into D3cold before
2141          * that.
2142          */
2143         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2144         adev->flags.initialized = false;
2145         acpi_device_clear_enumerated(adev);
2146 }
2147 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2148
2149 int acpi_bus_register_early_device(int type)
2150 {
2151         struct acpi_device *device = NULL;
2152         int result;
2153
2154         result = acpi_add_single_object(&device, NULL,
2155                                         type, ACPI_STA_DEFAULT);
2156         if (result)
2157                 return result;
2158
2159         device->flags.match_driver = true;
2160         return device_attach(&device->dev);
2161 }
2162 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2163
2164 static int acpi_bus_scan_fixed(void)
2165 {
2166         int result = 0;
2167
2168         /*
2169          * Enumerate all fixed-feature devices.
2170          */
2171         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2172                 struct acpi_device *device = NULL;
2173
2174                 result = acpi_add_single_object(&device, NULL,
2175                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2176                                                 ACPI_STA_DEFAULT);
2177                 if (result)
2178                         return result;
2179
2180                 device->flags.match_driver = true;
2181                 result = device_attach(&device->dev);
2182                 if (result < 0)
2183                         return result;
2184
2185                 device_init_wakeup(&device->dev, true);
2186         }
2187
2188         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2189                 struct acpi_device *device = NULL;
2190
2191                 result = acpi_add_single_object(&device, NULL,
2192                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2193                                                 ACPI_STA_DEFAULT);
2194                 if (result)
2195                         return result;
2196
2197                 device->flags.match_driver = true;
2198                 result = device_attach(&device->dev);
2199         }
2200
2201         return result < 0 ? result : 0;
2202 }
2203
2204 static void __init acpi_get_spcr_uart_addr(void)
2205 {
2206         acpi_status status;
2207         struct acpi_table_spcr *spcr_ptr;
2208
2209         status = acpi_get_table(ACPI_SIG_SPCR, 0,
2210                                 (struct acpi_table_header **)&spcr_ptr);
2211         if (ACPI_FAILURE(status)) {
2212                 pr_warn(PREFIX "STAO table present, but SPCR is missing\n");
2213                 return;
2214         }
2215
2216         spcr_uart_addr = spcr_ptr->serial_port.address;
2217         acpi_put_table((struct acpi_table_header *)spcr_ptr);
2218 }
2219
2220 static bool acpi_scan_initialized;
2221
2222 int __init acpi_scan_init(void)
2223 {
2224         int result;
2225         acpi_status status;
2226         struct acpi_table_stao *stao_ptr;
2227
2228         acpi_pci_root_init();
2229         acpi_pci_link_init();
2230         acpi_processor_init();
2231         acpi_platform_init();
2232         acpi_lpss_init();
2233         acpi_apd_init();
2234         acpi_cmos_rtc_init();
2235         acpi_container_init();
2236         acpi_memory_hotplug_init();
2237         acpi_watchdog_init();
2238         acpi_pnp_init();
2239         acpi_int340x_thermal_init();
2240         acpi_amba_init();
2241         acpi_init_lpit();
2242
2243         acpi_scan_add_handler(&generic_device_handler);
2244
2245         /*
2246          * If there is STAO table, check whether it needs to ignore the UART
2247          * device in SPCR table.
2248          */
2249         status = acpi_get_table(ACPI_SIG_STAO, 0,
2250                                 (struct acpi_table_header **)&stao_ptr);
2251         if (ACPI_SUCCESS(status)) {
2252                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2253                         pr_info(PREFIX "STAO Name List not yet supported.\n");
2254
2255                 if (stao_ptr->ignore_uart)
2256                         acpi_get_spcr_uart_addr();
2257
2258                 acpi_put_table((struct acpi_table_header *)stao_ptr);
2259         }
2260
2261         acpi_gpe_apply_masked_gpes();
2262         acpi_update_all_gpes();
2263
2264         /*
2265          * Although we call __add_memory() that is documented to require the
2266          * device_hotplug_lock, it is not necessary here because this is an
2267          * early code when userspace or any other code path cannot trigger
2268          * hotplug/hotunplug operations.
2269          */
2270         mutex_lock(&acpi_scan_lock);
2271         /*
2272          * Enumerate devices in the ACPI namespace.
2273          */
2274         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2275         if (result)
2276                 goto out;
2277
2278         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2279         if (result)
2280                 goto out;
2281
2282         /* Fixed feature devices do not exist on HW-reduced platform */
2283         if (!acpi_gbl_reduced_hardware) {
2284                 result = acpi_bus_scan_fixed();
2285                 if (result) {
2286                         acpi_detach_data(acpi_root->handle,
2287                                          acpi_scan_drop_device);
2288                         acpi_device_del(acpi_root);
2289                         put_device(&acpi_root->dev);
2290                         goto out;
2291                 }
2292         }
2293
2294         acpi_scan_initialized = true;
2295
2296  out:
2297         mutex_unlock(&acpi_scan_lock);
2298         return result;
2299 }
2300
2301 static struct acpi_probe_entry *ape;
2302 static int acpi_probe_count;
2303 static DEFINE_MUTEX(acpi_probe_mutex);
2304
2305 static int __init acpi_match_madt(union acpi_subtable_headers *header,
2306                                   const unsigned long end)
2307 {
2308         if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2309                 if (!ape->probe_subtbl(header, end))
2310                         acpi_probe_count++;
2311
2312         return 0;
2313 }
2314
2315 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2316 {
2317         int count = 0;
2318
2319         if (acpi_disabled)
2320                 return 0;
2321
2322         mutex_lock(&acpi_probe_mutex);
2323         for (ape = ap_head; nr; ape++, nr--) {
2324                 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2325                         acpi_probe_count = 0;
2326                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2327                         count += acpi_probe_count;
2328                 } else {
2329                         int res;
2330                         res = acpi_table_parse(ape->id, ape->probe_table);
2331                         if (!res)
2332                                 count++;
2333                 }
2334         }
2335         mutex_unlock(&acpi_probe_mutex);
2336
2337         return count;
2338 }
2339
2340 struct acpi_table_events_work {
2341         struct work_struct work;
2342         void *table;
2343         u32 event;
2344 };
2345
2346 static void acpi_table_events_fn(struct work_struct *work)
2347 {
2348         struct acpi_table_events_work *tew;
2349
2350         tew = container_of(work, struct acpi_table_events_work, work);
2351
2352         if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2353                 acpi_scan_lock_acquire();
2354                 acpi_bus_scan(ACPI_ROOT_OBJECT);
2355                 acpi_scan_lock_release();
2356         }
2357
2358         kfree(tew);
2359 }
2360
2361 void acpi_scan_table_handler(u32 event, void *table, void *context)
2362 {
2363         struct acpi_table_events_work *tew;
2364
2365         if (!acpi_scan_initialized)
2366                 return;
2367
2368         if (event != ACPI_TABLE_EVENT_LOAD)
2369                 return;
2370
2371         tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2372         if (!tew)
2373                 return;
2374
2375         INIT_WORK(&tew->work, acpi_table_events_fn);
2376         tew->table = table;
2377         tew->event = event;
2378
2379         schedule_work(&tew->work);
2380 }
2381
2382 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2383 {
2384         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2385 }
2386 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2387
2388 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2389 {
2390         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2391 }
2392 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);