drivers/acpi/scan.c

   1 /*
   2  * scan.c - support for transforming the ACPI namespace into individual objects
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/init.h>
   7 #include <linux/slab.h>
   8 #include <linux/kernel.h>
   9 #include <linux/acpi.h>
  10 #include <linux/signal.h>
  11 #include <linux/kthread.h>
  12 #include <linux/dmi.h>
  13 #include <linux/nls.h>
  14 #include <linux/dma-mapping.h>
  15
  16 #include <asm/pgtable.h>
  17
  18 #include "internal.h"
  19
  20 #define _COMPONENT              ACPI_BUS_COMPONENT
  21 ACPI_MODULE_NAME("scan");
  22 extern struct acpi_device *acpi_root;
  23
  24 #define ACPI_BUS_CLASS                  "system_bus"
  25 #define ACPI_BUS_HID                    "LNXSYBUS"
  26 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  27
  28 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  29
  30 #define INVALID_ACPI_HANDLE     ((acpi_handle)empty_zero_page)
  31
  32 /*
  33  * If set, devices will be hot-removed even if they cannot be put offline
  34  * gracefully (from the kernel's standpoint).
  35  */
  36 bool acpi_force_hot_remove;
  37
  38 static const char *dummy_hid = "device";
  39
  40 static LIST_HEAD(acpi_dep_list);
  41 static DEFINE_MUTEX(acpi_dep_list_lock);
  42 LIST_HEAD(acpi_bus_id_list);
  43 static DEFINE_MUTEX(acpi_scan_lock);
  44 static LIST_HEAD(acpi_scan_handlers_list);
  45 DEFINE_MUTEX(acpi_device_lock);
  46 LIST_HEAD(acpi_wakeup_device_list);
  47 static DEFINE_MUTEX(acpi_hp_context_lock);
  48
  49 struct acpi_dep_data {
  50         struct list_head node;
  51         acpi_handle master;
  52         acpi_handle slave;
  53 };
  54
  55 void acpi_scan_lock_acquire(void)
  56 {
  57         mutex_lock(&acpi_scan_lock);
  58 }
  59 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  60
  61 void acpi_scan_lock_release(void)
  62 {
  63         mutex_unlock(&acpi_scan_lock);
  64 }
  65 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  66
  67 void acpi_lock_hp_context(void)
  68 {
  69         mutex_lock(&acpi_hp_context_lock);
  70 }
  71
  72 void acpi_unlock_hp_context(void)
  73 {
  74         mutex_unlock(&acpi_hp_context_lock);
  75 }
  76
  77 void acpi_initialize_hp_context(struct acpi_device *adev,
  78                                 struct acpi_hotplug_context *hp,
  79                                 int (*notify)(struct acpi_device *, u32),
  80                                 void (*uevent)(struct acpi_device *, u32))
  81 {
  82         acpi_lock_hp_context();
  83         hp->notify = notify;
  84         hp->uevent = uevent;
  85         acpi_set_hp_context(adev, hp);
  86         acpi_unlock_hp_context();
  87 }
  88 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
  89
  90 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  91 {
  92         if (!handler)
  93                 return -EINVAL;
  94
  95         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  96         return 0;
  97 }
  98
  99 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
 100                                        const char *hotplug_profile_name)
 101 {
 102         int error;
 103
 104         error = acpi_scan_add_handler(handler);
 105         if (error)
 106                 return error;
 107
 108         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
 109         return 0;
 110 }
 111
 112 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 113 {
 114         struct acpi_device_physical_node *pn;
 115         bool offline = true;
 116
 117         /*
 118          * acpi_container_offline() calls this for all of the container's
 119          * children under the container's physical_node_lock lock.
 120          */
 121         mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
 122
 123         list_for_each_entry(pn, &adev->physical_node_list, node)
 124                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
 125                         if (uevent)
 126                                 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
 127
 128                         offline = false;
 129                         break;
 130                 }
 131
 132         mutex_unlock(&adev->physical_node_lock);
 133         return offline;
 134 }
 135
 136 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 137                                     void **ret_p)
 138 {
 139         struct acpi_device *device = NULL;
 140         struct acpi_device_physical_node *pn;
 141         bool second_pass = (bool)data;
 142         acpi_status status = AE_OK;
 143
 144         if (acpi_bus_get_device(handle, &device))
 145                 return AE_OK;
 146
 147         if (device->handler && !device->handler->hotplug.enabled) {
 148                 *ret_p = &device->dev;
 149                 return AE_SUPPORT;
 150         }
 151
 152         mutex_lock(&device->physical_node_lock);
 153
 154         list_for_each_entry(pn, &device->physical_node_list, node) {
 155                 int ret;
 156
 157                 if (second_pass) {
 158                         /* Skip devices offlined by the first pass. */
 159                         if (pn->put_online)
 160                                 continue;
 161                 } else {
 162                         pn->put_online = false;
 163                 }
 164                 ret = device_offline(pn->dev);
 165                 if (acpi_force_hot_remove)
 166                         continue;
 167
 168                 if (ret >= 0) {
 169                         pn->put_online = !ret;
 170                 } else {
 171                         *ret_p = pn->dev;
 172                         if (second_pass) {
 173                                 status = AE_ERROR;
 174                                 break;
 175                         }
 176                 }
 177         }
 178
 179         mutex_unlock(&device->physical_node_lock);
 180
 181         return status;
 182 }
 183
 184 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 185                                    void **ret_p)
 186 {
 187         struct acpi_device *device = NULL;
 188         struct acpi_device_physical_node *pn;
 189
 190         if (acpi_bus_get_device(handle, &device))
 191                 return AE_OK;
 192
 193         mutex_lock(&device->physical_node_lock);
 194
 195         list_for_each_entry(pn, &device->physical_node_list, node)
 196                 if (pn->put_online) {
 197                         device_online(pn->dev);
 198                         pn->put_online = false;
 199                 }
 200
 201         mutex_unlock(&device->physical_node_lock);
 202
 203         return AE_OK;
 204 }
 205
 206 static int acpi_scan_try_to_offline(struct acpi_device *device)
 207 {
 208         acpi_handle handle = device->handle;
 209         struct device *errdev = NULL;
 210         acpi_status status;
 211
 212         /*
 213          * Carry out two passes here and ignore errors in the first pass,
 214          * because if the devices in question are memory blocks and
 215          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 216          * that the other blocks depend on, but it is not known in advance which
 217          * block holds them.
 218          *
 219          * If the first pass is successful, the second one isn't needed, though.
 220          */
 221         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 222                                      NULL, acpi_bus_offline, (void *)false,
 223                                      (void **)&errdev);
 224         if (status == AE_SUPPORT) {
 225                 dev_warn(errdev, "Offline disabled.\n");
 226                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 227                                     acpi_bus_online, NULL, NULL, NULL);
 228                 return -EPERM;
 229         }
 230         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
 231         if (errdev) {
 232                 errdev = NULL;
 233                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 234                                     NULL, acpi_bus_offline, (void *)true,
 235                                     (void **)&errdev);
 236                 if (!errdev || acpi_force_hot_remove)
 237                         acpi_bus_offline(handle, 0, (void *)true,
 238                                          (void **)&errdev);
 239
 240                 if (errdev && !acpi_force_hot_remove) {
 241                         dev_warn(errdev, "Offline failed.\n");
 242                         acpi_bus_online(handle, 0, NULL, NULL);
 243                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 244                                             ACPI_UINT32_MAX, acpi_bus_online,
 245                                             NULL, NULL, NULL);
 246                         return -EBUSY;
 247                 }
 248         }
 249         return 0;
 250 }
 251
 252 static int acpi_scan_hot_remove(struct acpi_device *device)
 253 {
 254         acpi_handle handle = device->handle;
 255         unsigned long long sta;
 256         acpi_status status;
 257
 258         if (device->handler && device->handler->hotplug.demand_offline
 259             && !acpi_force_hot_remove) {
 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                 if (error == -EPERM) {
 410                         ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 411                         goto err_out;
 412                 }
 413         } else {
 414                 int (*notify)(struct acpi_device *, u32);
 415
 416                 acpi_lock_hp_context();
 417                 notify = adev->hp ? adev->hp->notify : NULL;
 418                 acpi_unlock_hp_context();
 419                 /*
 420                  * There may be additional notify handlers for device objects
 421                  * without the .event() callback, so ignore them here.
 422                  */
 423                 if (notify)
 424                         error = notify(adev, src);
 425                 else
 426                         goto out;
 427         }
 428         if (!error)
 429                 ost_code = ACPI_OST_SC_SUCCESS;
 430
 431  err_out:
 432         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 433
 434  out:
 435         acpi_bus_put_acpi_device(adev);
 436         mutex_unlock(&acpi_scan_lock);
 437         unlock_device_hotplug();
 438 }
 439
 440 static void acpi_free_power_resources_lists(struct acpi_device *device)
 441 {
 442         int i;
 443
 444         if (device->wakeup.flags.valid)
 445                 acpi_power_resources_list_free(&device->wakeup.resources);
 446
 447         if (!device->power.flags.power_resources)
 448                 return;
 449
 450         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 451                 struct acpi_device_power_state *ps = &device->power.states[i];
 452                 acpi_power_resources_list_free(&ps->resources);
 453         }
 454 }
 455
 456 static void acpi_device_release(struct device *dev)
 457 {
 458         struct acpi_device *acpi_dev = to_acpi_device(dev);
 459
 460         acpi_free_properties(acpi_dev);
 461         acpi_free_pnp_ids(&acpi_dev->pnp);
 462         acpi_free_power_resources_lists(acpi_dev);
 463         kfree(acpi_dev);
 464 }
 465
 466 static void acpi_device_del(struct acpi_device *device)
 467 {
 468         struct acpi_device_bus_id *acpi_device_bus_id;
 469
 470         mutex_lock(&acpi_device_lock);
 471         if (device->parent)
 472                 list_del(&device->node);
 473
 474         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
 475                 if (!strcmp(acpi_device_bus_id->bus_id,
 476                             acpi_device_hid(device))) {
 477                         if (acpi_device_bus_id->instance_no > 0)
 478                                 acpi_device_bus_id->instance_no--;
 479                         else {
 480                                 list_del(&acpi_device_bus_id->node);
 481                                 kfree(acpi_device_bus_id);
 482                         }
 483                         break;
 484                 }
 485
 486         list_del(&device->wakeup_list);
 487         mutex_unlock(&acpi_device_lock);
 488
 489         acpi_power_add_remove_device(device, false);
 490         acpi_device_remove_files(device);
 491         if (device->remove)
 492                 device->remove(device);
 493
 494         device_del(&device->dev);
 495 }
 496
 497 static LIST_HEAD(acpi_device_del_list);
 498 static DEFINE_MUTEX(acpi_device_del_lock);
 499
 500 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 501 {
 502         for (;;) {
 503                 struct acpi_device *adev;
 504
 505                 mutex_lock(&acpi_device_del_lock);
 506
 507                 if (list_empty(&acpi_device_del_list)) {
 508                         mutex_unlock(&acpi_device_del_lock);
 509                         break;
 510                 }
 511                 adev = list_first_entry(&acpi_device_del_list,
 512                                         struct acpi_device, del_list);
 513                 list_del(&adev->del_list);
 514
 515                 mutex_unlock(&acpi_device_del_lock);
 516
 517                 acpi_device_del(adev);
 518                 /*
 519                  * Drop references to all power resources that might have been
 520                  * used by the device.
 521                  */
 522                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
 523                 put_device(&adev->dev);
 524         }
 525 }
 526
 527 /**
 528  * acpi_scan_drop_device - Drop an ACPI device object.
 529  * @handle: Handle of an ACPI namespace node, not used.
 530  * @context: Address of the ACPI device object to drop.
 531  *
 532  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
 533  * namespace node the device object pointed to by @context is attached to.
 534  *
 535  * The unregistration is carried out asynchronously to avoid running
 536  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
 537  * ensure the correct ordering (the device objects must be unregistered in the
 538  * same order in which the corresponding namespace nodes are deleted).
 539  */
 540 static void acpi_scan_drop_device(acpi_handle handle, void *context)
 541 {
 542         static DECLARE_WORK(work, acpi_device_del_work_fn);
 543         struct acpi_device *adev = context;
 544
 545         mutex_lock(&acpi_device_del_lock);
 546
 547         /*
 548          * Use the ACPI hotplug workqueue which is ordered, so this work item
 549          * won't run after any hotplug work items submitted subsequently.  That
 550          * prevents attempts to register device objects identical to those being
 551          * deleted from happening concurrently (such attempts result from
 552          * hotplug events handled via the ACPI hotplug workqueue).  It also will
 553          * run after all of the work items submitted previosuly, which helps
 554          * those work items to ensure that they are not accessing stale device
 555          * objects.
 556          */
 557         if (list_empty(&acpi_device_del_list))
 558                 acpi_queue_hotplug_work(&work);
 559
 560         list_add_tail(&adev->del_list, &acpi_device_del_list);
 561         /* Make acpi_ns_validate_handle() return NULL for this handle. */
 562         adev->handle = INVALID_ACPI_HANDLE;
 563
 564         mutex_unlock(&acpi_device_del_lock);
 565 }
 566
 567 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
 568                                 void (*callback)(void *))
 569 {
 570         acpi_status status;
 571
 572         if (!device)
 573                 return -EINVAL;
 574
 575         status = acpi_get_data_full(handle, acpi_scan_drop_device,
 576                                     (void **)device, callback);
 577         if (ACPI_FAILURE(status) || !*device) {
 578                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 579                                   handle));
 580                 return -ENODEV;
 581         }
 582         return 0;
 583 }
 584
 585 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 586 {
 587         return acpi_get_device_data(handle, device, NULL);
 588 }
 589 EXPORT_SYMBOL(acpi_bus_get_device);
 590
 591 static void get_acpi_device(void *dev)
 592 {
 593         if (dev)
 594                 get_device(&((struct acpi_device *)dev)->dev);
 595 }
 596
 597 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 598 {
 599         struct acpi_device *adev = NULL;
 600
 601         acpi_get_device_data(handle, &adev, get_acpi_device);
 602         return adev;
 603 }
 604
 605 void acpi_bus_put_acpi_device(struct acpi_device *adev)
 606 {
 607         put_device(&adev->dev);
 608 }
 609
 610 int acpi_device_add(struct acpi_device *device,
 611                     void (*release)(struct device *))
 612 {
 613         int result;
 614         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 615         int found = 0;
 616
 617         if (device->handle) {
 618                 acpi_status status;
 619
 620                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
 621                                           device);
 622                 if (ACPI_FAILURE(status)) {
 623                         acpi_handle_err(device->handle,
 624                                         "Unable to attach device data\n");
 625                         return -ENODEV;
 626                 }
 627         }
 628
 629         /*
 630          * Linkage
 631          * -------
 632          * Link this device to its parent and siblings.
 633          */
 634         INIT_LIST_HEAD(&device->children);
 635         INIT_LIST_HEAD(&device->node);
 636         INIT_LIST_HEAD(&device->wakeup_list);
 637         INIT_LIST_HEAD(&device->physical_node_list);
 638         INIT_LIST_HEAD(&device->del_list);
 639         mutex_init(&device->physical_node_lock);
 640
 641         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 642         if (!new_bus_id) {
 643                 pr_err(PREFIX "Memory allocation error\n");
 644                 result = -ENOMEM;
 645                 goto err_detach;
 646         }
 647
 648         mutex_lock(&acpi_device_lock);
 649         /*
 650          * Find suitable bus_id and instance number in acpi_bus_id_list
 651          * If failed, create one and link it into acpi_bus_id_list
 652          */
 653         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 654                 if (!strcmp(acpi_device_bus_id->bus_id,
 655                             acpi_device_hid(device))) {
 656                         acpi_device_bus_id->instance_no++;
 657                         found = 1;
 658                         kfree(new_bus_id);
 659                         break;
 660                 }
 661         }
 662         if (!found) {
 663                 acpi_device_bus_id = new_bus_id;
 664                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 665                 acpi_device_bus_id->instance_no = 0;
 666                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 667         }
 668         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 669
 670         if (device->parent)
 671                 list_add_tail(&device->node, &device->parent->children);
 672
 673         if (device->wakeup.flags.valid)
 674                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 675         mutex_unlock(&acpi_device_lock);
 676
 677         if (device->parent)
 678                 device->dev.parent = &device->parent->dev;
 679         device->dev.bus = &acpi_bus_type;
 680         device->dev.release = release;
 681         result = device_add(&device->dev);
 682         if (result) {
 683                 dev_err(&device->dev, "Error registering device\n");
 684                 goto err;
 685         }
 686
 687         result = acpi_device_setup_files(device);
 688         if (result)
 689                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 690                        dev_name(&device->dev));
 691
 692         return 0;
 693
 694  err:
 695         mutex_lock(&acpi_device_lock);
 696         if (device->parent)
 697                 list_del(&device->node);
 698         list_del(&device->wakeup_list);
 699         mutex_unlock(&acpi_device_lock);
 700
 701  err_detach:
 702         acpi_detach_data(device->handle, acpi_scan_drop_device);
 703         return result;
 704 }
 705
 706 /* --------------------------------------------------------------------------
 707                                  Device Enumeration
 708    -------------------------------------------------------------------------- */
 709 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 710 {
 711         struct acpi_device *device = NULL;
 712         acpi_status status;
 713
 714         /*
 715          * Fixed hardware devices do not appear in the namespace and do not
 716          * have handles, but we fabricate acpi_devices for them, so we have
 717          * to deal with them specially.
 718          */
 719         if (!handle)
 720                 return acpi_root;
 721
 722         do {
 723                 status = acpi_get_parent(handle, &handle);
 724                 if (ACPI_FAILURE(status))
 725                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 726         } while (acpi_bus_get_device(handle, &device));
 727         return device;
 728 }
 729
 730 acpi_status
 731 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 732 {
 733         acpi_status status;
 734         acpi_handle tmp;
 735         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 736         union acpi_object *obj;
 737
 738         status = acpi_get_handle(handle, "_EJD", &tmp);
 739         if (ACPI_FAILURE(status))
 740                 return status;
 741
 742         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 743         if (ACPI_SUCCESS(status)) {
 744                 obj = buffer.pointer;
 745                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 746                                          ejd);
 747                 kfree(buffer.pointer);
 748         }
 749         return status;
 750 }
 751 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 752
 753 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 754                                         struct acpi_device_wakeup *wakeup)
 755 {
 756         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 757         union acpi_object *package = NULL;
 758         union acpi_object *element = NULL;
 759         acpi_status status;
 760         int err = -ENODATA;
 761
 762         if (!wakeup)
 763                 return -EINVAL;
 764
 765         INIT_LIST_HEAD(&wakeup->resources);
 766
 767         /* _PRW */
 768         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 769         if (ACPI_FAILURE(status)) {
 770                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 771                 return err;
 772         }
 773
 774         package = (union acpi_object *)buffer.pointer;
 775
 776         if (!package || package->package.count < 2)
 777                 goto out;
 778
 779         element = &(package->package.elements[0]);
 780         if (!element)
 781                 goto out;
 782
 783         if (element->type == ACPI_TYPE_PACKAGE) {
 784                 if ((element->package.count < 2) ||
 785                     (element->package.elements[0].type !=
 786                      ACPI_TYPE_LOCAL_REFERENCE)
 787                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 788                         goto out;
 789
 790                 wakeup->gpe_device =
 791                     element->package.elements[0].reference.handle;
 792                 wakeup->gpe_number =
 793                     (u32) element->package.elements[1].integer.value;
 794         } else if (element->type == ACPI_TYPE_INTEGER) {
 795                 wakeup->gpe_device = NULL;
 796                 wakeup->gpe_number = element->integer.value;
 797         } else {
 798                 goto out;
 799         }
 800
 801         element = &(package->package.elements[1]);
 802         if (element->type != ACPI_TYPE_INTEGER)
 803                 goto out;
 804
 805         wakeup->sleep_state = element->integer.value;
 806
 807         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 808         if (err)
 809                 goto out;
 810
 811         if (!list_empty(&wakeup->resources)) {
 812                 int sleep_state;
 813
 814                 err = acpi_power_wakeup_list_init(&wakeup->resources,
 815                                                   &sleep_state);
 816                 if (err) {
 817                         acpi_handle_warn(handle, "Retrieving current states "
 818                                          "of wakeup power resources failed\n");
 819                         acpi_power_resources_list_free(&wakeup->resources);
 820                         goto out;
 821                 }
 822                 if (sleep_state < wakeup->sleep_state) {
 823                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
 824                                          "(S%d) by S%d from power resources\n",
 825                                          (int)wakeup->sleep_state, sleep_state);
 826                         wakeup->sleep_state = sleep_state;
 827                 }
 828         }
 829
 830  out:
 831         kfree(buffer.pointer);
 832         return err;
 833 }
 834
 835 static void acpi_wakeup_gpe_init(struct acpi_device *device)
 836 {
 837         static const struct acpi_device_id button_device_ids[] = {
 838                 {"PNP0C0C", 0},
 839                 {"PNP0C0D", 0},
 840                 {"PNP0C0E", 0},
 841                 {"", 0},
 842         };
 843         struct acpi_device_wakeup *wakeup = &device->wakeup;
 844         acpi_status status;
 845         acpi_event_status event_status;
 846
 847         wakeup->flags.notifier_present = 0;
 848
 849         /* Power button, Lid switch always enable wakeup */
 850         if (!acpi_match_device_ids(device, button_device_ids)) {
 851                 wakeup->flags.run_wake = 1;
 852                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 853                         /* Do not use Lid/sleep button for S5 wakeup */
 854                         if (wakeup->sleep_state == ACPI_STATE_S5)
 855                                 wakeup->sleep_state = ACPI_STATE_S4;
 856                 }
 857                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 858                 device_set_wakeup_capable(&device->dev, true);
 859                 return;
 860         }
 861
 862         acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 863                                 wakeup->gpe_number);
 864         status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
 865                                      &event_status);
 866         if (ACPI_FAILURE(status))
 867                 return;
 868
 869         wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
 870 }
 871
 872 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 873 {
 874         int err;
 875
 876         /* Presence of _PRW indicates wake capable */
 877         if (!acpi_has_method(device->handle, "_PRW"))
 878                 return;
 879
 880         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
 881                                                            &device->wakeup);
 882         if (err) {
 883                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
 884                 return;
 885         }
 886
 887         device->wakeup.flags.valid = 1;
 888         device->wakeup.prepare_count = 0;
 889         acpi_wakeup_gpe_init(device);
 890         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 891          * system for the ACPI device with the _PRW object.
 892          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 893          * So it is necessary to call _DSW object first. Only when it is not
 894          * present will the _PSW object used.
 895          */
 896         err = acpi_device_sleep_wake(device, 0, 0, 0);
 897         if (err)
 898                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 899                                 "error in _DSW or _PSW evaluation\n"));
 900 }
 901
 902 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 903 {
 904         struct acpi_device_power_state *ps = &device->power.states[state];
 905         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 906         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 907         acpi_status status;
 908
 909         INIT_LIST_HEAD(&ps->resources);
 910
 911         /* Evaluate "_PRx" to get referenced power resources */
 912         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 913         if (ACPI_SUCCESS(status)) {
 914                 union acpi_object *package = buffer.pointer;
 915
 916                 if (buffer.length && package
 917                     && package->type == ACPI_TYPE_PACKAGE
 918                     && package->package.count) {
 919                         int err = acpi_extract_power_resources(package, 0,
 920                                                                &ps->resources);
 921                         if (!err)
 922                                 device->power.flags.power_resources = 1;
 923                 }
 924                 ACPI_FREE(buffer.pointer);
 925         }
 926
 927         /* Evaluate "_PSx" to see if we can do explicit sets */
 928         pathname[2] = 'S';
 929         if (acpi_has_method(device->handle, pathname))
 930                 ps->flags.explicit_set = 1;
 931
 932         /* State is valid if there are means to put the device into it. */
 933         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
 934                 ps->flags.valid = 1;
 935
 936         ps->power = -1;         /* Unknown - driver assigned */
 937         ps->latency = -1;       /* Unknown - driver assigned */
 938 }
 939
 940 static void acpi_bus_get_power_flags(struct acpi_device *device)
 941 {
 942         u32 i;
 943
 944         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 945         if (!acpi_has_method(device->handle, "_PS0") &&
 946             !acpi_has_method(device->handle, "_PR0"))
 947                 return;
 948
 949         device->flags.power_manageable = 1;
 950
 951         /*
 952          * Power Management Flags
 953          */
 954         if (acpi_has_method(device->handle, "_PSC"))
 955                 device->power.flags.explicit_get = 1;
 956
 957         if (acpi_has_method(device->handle, "_IRC"))
 958                 device->power.flags.inrush_current = 1;
 959
 960         if (acpi_has_method(device->handle, "_DSW"))
 961                 device->power.flags.dsw_present = 1;
 962
 963         /*
 964          * Enumerate supported power management states
 965          */
 966         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
 967                 acpi_bus_init_power_state(device, i);
 968
 969         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
 970         if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
 971                 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
 972
 973         /* Set defaults for D0 and D3hot states (always valid) */
 974         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 975         device->power.states[ACPI_STATE_D0].power = 100;
 976         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
 977
 978         if (acpi_bus_init_power(device))
 979                 device->flags.power_manageable = 0;
 980 }
 981
 982 static void acpi_bus_get_flags(struct acpi_device *device)
 983 {
 984         /* Presence of _STA indicates 'dynamic_status' */
 985         if (acpi_has_method(device->handle, "_STA"))
 986                 device->flags.dynamic_status = 1;
 987
 988         /* Presence of _RMV indicates 'removable' */
 989         if (acpi_has_method(device->handle, "_RMV"))
 990                 device->flags.removable = 1;
 991
 992         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 993         if (acpi_has_method(device->handle, "_EJD") ||
 994             acpi_has_method(device->handle, "_EJ0"))
 995                 device->flags.ejectable = 1;
 996 }
 997
 998 static void acpi_device_get_busid(struct acpi_device *device)
 999 {
1000         char bus_id[5] = { '?', 0 };
1001         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1002         int i = 0;
1003
1004         /*
1005          * Bus ID
1006          * ------
1007          * The device's Bus ID is simply the object name.
1008          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1009          */
1010         if (ACPI_IS_ROOT_DEVICE(device)) {
1011                 strcpy(device->pnp.bus_id, "ACPI");
1012                 return;
1013         }
1014
1015         switch (device->device_type) {
1016         case ACPI_BUS_TYPE_POWER_BUTTON:
1017                 strcpy(device->pnp.bus_id, "PWRF");
1018                 break;
1019         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1020                 strcpy(device->pnp.bus_id, "SLPF");
1021                 break;
1022         default:
1023                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1024                 /* Clean up trailing underscores (if any) */
1025                 for (i = 3; i > 1; i--) {
1026                         if (bus_id[i] == '_')
1027                                 bus_id[i] = '\0';
1028                         else
1029                                 break;
1030                 }
1031                 strcpy(device->pnp.bus_id, bus_id);
1032                 break;
1033         }
1034 }
1035
1036 /*
1037  * acpi_ata_match - see if an acpi object is an ATA device
1038  *
1039  * If an acpi object has one of the ACPI ATA methods defined,
1040  * then we can safely call it an ATA device.
1041  */
1042 bool acpi_ata_match(acpi_handle handle)
1043 {
1044         return acpi_has_method(handle, "_GTF") ||
1045                acpi_has_method(handle, "_GTM") ||
1046                acpi_has_method(handle, "_STM") ||
1047                acpi_has_method(handle, "_SDD");
1048 }
1049
1050 /*
1051  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1052  *
1053  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1054  * then we can safely call it an ejectable drive bay
1055  */
1056 bool acpi_bay_match(acpi_handle handle)
1057 {
1058         acpi_handle phandle;
1059
1060         if (!acpi_has_method(handle, "_EJ0"))
1061                 return false;
1062         if (acpi_ata_match(handle))
1063                 return true;
1064         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1065                 return false;
1066
1067         return acpi_ata_match(phandle);
1068 }
1069
1070 bool acpi_device_is_battery(struct acpi_device *adev)
1071 {
1072         struct acpi_hardware_id *hwid;
1073
1074         list_for_each_entry(hwid, &adev->pnp.ids, list)
1075                 if (!strcmp("PNP0C0A", hwid->id))
1076                         return true;
1077
1078         return false;
1079 }
1080
1081 static bool is_ejectable_bay(struct acpi_device *adev)
1082 {
1083         acpi_handle handle = adev->handle;
1084
1085         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1086                 return true;
1087
1088         return acpi_bay_match(handle);
1089 }
1090
1091 /*
1092  * acpi_dock_match - see if an acpi object has a _DCK method
1093  */
1094 bool acpi_dock_match(acpi_handle handle)
1095 {
1096         return acpi_has_method(handle, "_DCK");
1097 }
1098
1099 static acpi_status
1100 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1101                           void **return_value)
1102 {
1103         long *cap = context;
1104
1105         if (acpi_has_method(handle, "_BCM") &&
1106             acpi_has_method(handle, "_BCL")) {
1107                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1108                                   "support\n"));
1109                 *cap |= ACPI_VIDEO_BACKLIGHT;
1110                 if (!acpi_has_method(handle, "_BQC"))
1111                         printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
1112                                 "cannot determine initial brightness\n");
1113                 /* We have backlight support, no need to scan further */
1114                 return AE_CTRL_TERMINATE;
1115         }
1116         return 0;
1117 }
1118
1119 /* Returns true if the ACPI object is a video device which can be
1120  * handled by video.ko.
1121  * The device will get a Linux specific CID added in scan.c to
1122  * identify the device as an ACPI graphics device
1123  * Be aware that the graphics device may not be physically present
1124  * Use acpi_video_get_capabilities() to detect general ACPI video
1125  * capabilities of present cards
1126  */
1127 long acpi_is_video_device(acpi_handle handle)
1128 {
1129         long video_caps = 0;
1130
1131         /* Is this device able to support video switching ? */
1132         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1133                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1134
1135         /* Is this device able to retrieve a video ROM ? */
1136         if (acpi_has_method(handle, "_ROM"))
1137                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1138
1139         /* Is this device able to configure which video head to be POSTed ? */
1140         if (acpi_has_method(handle, "_VPO") &&
1141             acpi_has_method(handle, "_GPD") &&
1142             acpi_has_method(handle, "_SPD"))
1143                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1144
1145         /* Only check for backlight functionality if one of the above hit. */
1146         if (video_caps)
1147                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1148                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1149                                     &video_caps, NULL);
1150
1151         return video_caps;
1152 }
1153 EXPORT_SYMBOL(acpi_is_video_device);
1154
1155 const char *acpi_device_hid(struct acpi_device *device)
1156 {
1157         struct acpi_hardware_id *hid;
1158
1159         if (list_empty(&device->pnp.ids))
1160                 return dummy_hid;
1161
1162         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1163         return hid->id;
1164 }
1165 EXPORT_SYMBOL(acpi_device_hid);
1166
1167 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1168 {
1169         struct acpi_hardware_id *id;
1170
1171         id = kmalloc(sizeof(*id), GFP_KERNEL);
1172         if (!id)
1173                 return;
1174
1175         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1176         if (!id->id) {
1177                 kfree(id);
1178                 return;
1179         }
1180
1181         list_add_tail(&id->list, &pnp->ids);
1182         pnp->type.hardware_id = 1;
1183 }
1184
1185 /*
1186  * Old IBM workstations have a DSDT bug wherein the SMBus object
1187  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1188  * prefix.  Work around this.
1189  */
1190 static bool acpi_ibm_smbus_match(acpi_handle handle)
1191 {
1192         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1193         struct acpi_buffer path = { sizeof(node_name), node_name };
1194
1195         if (!dmi_name_in_vendors("IBM"))
1196                 return false;
1197
1198         /* Look for SMBS object */
1199         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1200             strcmp("SMBS", path.pointer))
1201                 return false;
1202
1203         /* Does it have the necessary (but misnamed) methods? */
1204         if (acpi_has_method(handle, "SBI") &&
1205             acpi_has_method(handle, "SBR") &&
1206             acpi_has_method(handle, "SBW"))
1207                 return true;
1208
1209         return false;
1210 }
1211
1212 static bool acpi_object_is_system_bus(acpi_handle handle)
1213 {
1214         acpi_handle tmp;
1215
1216         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1217             tmp == handle)
1218                 return true;
1219         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1220             tmp == handle)
1221                 return true;
1222
1223         return false;
1224 }
1225
1226 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1227                                 int device_type)
1228 {
1229         acpi_status status;
1230         struct acpi_device_info *info;
1231         struct acpi_pnp_device_id_list *cid_list;
1232         int i;
1233
1234         switch (device_type) {
1235         case ACPI_BUS_TYPE_DEVICE:
1236                 if (handle == ACPI_ROOT_OBJECT) {
1237                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1238                         break;
1239                 }
1240
1241                 status = acpi_get_object_info(handle, &info);
1242                 if (ACPI_FAILURE(status)) {
1243                         pr_err(PREFIX "%s: Error reading device info\n",
1244                                         __func__);
1245                         return;
1246                 }
1247
1248                 if (info->valid & ACPI_VALID_HID) {
1249                         acpi_add_id(pnp, info->hardware_id.string);
1250                         pnp->type.platform_id = 1;
1251                 }
1252                 if (info->valid & ACPI_VALID_CID) {
1253                         cid_list = &info->compatible_id_list;
1254                         for (i = 0; i < cid_list->count; i++)
1255                                 acpi_add_id(pnp, cid_list->ids[i].string);
1256                 }
1257                 if (info->valid & ACPI_VALID_ADR) {
1258                         pnp->bus_address = info->address;
1259                         pnp->type.bus_address = 1;
1260                 }
1261                 if (info->valid & ACPI_VALID_UID)
1262                         pnp->unique_id = kstrdup(info->unique_id.string,
1263                                                         GFP_KERNEL);
1264                 if (info->valid & ACPI_VALID_CLS)
1265                         acpi_add_id(pnp, info->class_code.string);
1266
1267                 kfree(info);
1268
1269                 /*
1270                  * Some devices don't reliably have _HIDs & _CIDs, so add
1271                  * synthetic HIDs to make sure drivers can find them.
1272                  */
1273                 if (acpi_is_video_device(handle))
1274                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1275                 else if (acpi_bay_match(handle))
1276                         acpi_add_id(pnp, ACPI_BAY_HID);
1277                 else if (acpi_dock_match(handle))
1278                         acpi_add_id(pnp, ACPI_DOCK_HID);
1279                 else if (acpi_ibm_smbus_match(handle))
1280                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1281                 else if (list_empty(&pnp->ids) &&
1282                          acpi_object_is_system_bus(handle)) {
1283                         /* \_SB, \_TZ, LNXSYBUS */
1284                         acpi_add_id(pnp, ACPI_BUS_HID);
1285                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1286                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1287                 }
1288
1289                 break;
1290         case ACPI_BUS_TYPE_POWER:
1291                 acpi_add_id(pnp, ACPI_POWER_HID);
1292                 break;
1293         case ACPI_BUS_TYPE_PROCESSOR:
1294                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1295                 break;
1296         case ACPI_BUS_TYPE_THERMAL:
1297                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1298                 break;
1299         case ACPI_BUS_TYPE_POWER_BUTTON:
1300                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1301                 break;
1302         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1303                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1304                 break;
1305         }
1306 }
1307
1308 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1309 {
1310         struct acpi_hardware_id *id, *tmp;
1311
1312         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1313                 kfree_const(id->id);
1314                 kfree(id);
1315         }
1316         kfree(pnp->unique_id);
1317 }
1318
1319 /**
1320  * acpi_dma_supported - Check DMA support for the specified device.
1321  * @adev: The pointer to acpi device
1322  *
1323  * Return false if DMA is not supported. Otherwise, return true
1324  */
1325 bool acpi_dma_supported(struct acpi_device *adev)
1326 {
1327         if (!adev)
1328                 return false;
1329
1330         if (adev->flags.cca_seen)
1331                 return true;
1332
1333         /*
1334         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1335         * DMA on "Intel platforms".  Presumably that includes all x86 and
1336         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1337         */
1338         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1339                 return true;
1340
1341         return false;
1342 }
1343
1344 /**
1345  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1346  * @adev: The pointer to acpi device
1347  *
1348  * Return enum dev_dma_attr.
1349  */
1350 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1351 {
1352         if (!acpi_dma_supported(adev))
1353                 return DEV_DMA_NOT_SUPPORTED;
1354
1355         if (adev->flags.coherent_dma)
1356                 return DEV_DMA_COHERENT;
1357         else
1358                 return DEV_DMA_NON_COHERENT;
1359 }
1360
1361 static void acpi_init_coherency(struct acpi_device *adev)
1362 {
1363         unsigned long long cca = 0;
1364         acpi_status status;
1365         struct acpi_device *parent = adev->parent;
1366
1367         if (parent && parent->flags.cca_seen) {
1368                 /*
1369                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1370                  * already saw one.
1371                  */
1372                 adev->flags.cca_seen = 1;
1373                 cca = parent->flags.coherent_dma;
1374         } else {
1375                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1376                                                NULL, &cca);
1377                 if (ACPI_SUCCESS(status))
1378                         adev->flags.cca_seen = 1;
1379                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1380                         /*
1381                          * If architecture does not specify that _CCA is
1382                          * required for DMA-able devices (e.g. x86),
1383                          * we default to _CCA=1.
1384                          */
1385                         cca = 1;
1386                 else
1387                         acpi_handle_debug(adev->handle,
1388                                           "ACPI device is missing _CCA.\n");
1389         }
1390
1391         adev->flags.coherent_dma = cca;
1392 }
1393
1394 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1395                              int type, unsigned long long sta)
1396 {
1397         INIT_LIST_HEAD(&device->pnp.ids);
1398         device->device_type = type;
1399         device->handle = handle;
1400         device->parent = acpi_bus_get_parent(handle);
1401         device->fwnode.type = FWNODE_ACPI;
1402         acpi_set_device_status(device, sta);
1403         acpi_device_get_busid(device);
1404         acpi_set_pnp_ids(handle, &device->pnp, type);
1405         acpi_init_properties(device);
1406         acpi_bus_get_flags(device);
1407         device->flags.match_driver = false;
1408         device->flags.initialized = true;
1409         device->flags.visited = false;
1410         device_initialize(&device->dev);
1411         dev_set_uevent_suppress(&device->dev, true);
1412         acpi_init_coherency(device);
1413 }
1414
1415 void acpi_device_add_finalize(struct acpi_device *device)
1416 {
1417         dev_set_uevent_suppress(&device->dev, false);
1418         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1419 }
1420
1421 static int acpi_add_single_object(struct acpi_device **child,
1422                                   acpi_handle handle, int type,
1423                                   unsigned long long sta)
1424 {
1425         int result;
1426         struct acpi_device *device;
1427         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1428
1429         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1430         if (!device) {
1431                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1432                 return -ENOMEM;
1433         }
1434
1435         acpi_init_device_object(device, handle, type, sta);
1436         acpi_bus_get_power_flags(device);
1437         acpi_bus_get_wakeup_device_flags(device);
1438
1439         result = acpi_device_add(device, acpi_device_release);
1440         if (result) {
1441                 acpi_device_release(&device->dev);
1442                 return result;
1443         }
1444
1445         acpi_power_add_remove_device(device, true);
1446         acpi_device_add_finalize(device);
1447         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1448         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1449                 dev_name(&device->dev), (char *) buffer.pointer,
1450                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1451         kfree(buffer.pointer);
1452         *child = device;
1453         return 0;
1454 }
1455
1456 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1457                                     unsigned long long *sta)
1458 {
1459         acpi_status status;
1460         acpi_object_type acpi_type;
1461
1462         status = acpi_get_type(handle, &acpi_type);
1463         if (ACPI_FAILURE(status))
1464                 return -ENODEV;
1465
1466         switch (acpi_type) {
1467         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1468         case ACPI_TYPE_DEVICE:
1469                 *type = ACPI_BUS_TYPE_DEVICE;
1470                 status = acpi_bus_get_status_handle(handle, sta);
1471                 if (ACPI_FAILURE(status))
1472                         *sta = 0;
1473                 break;
1474         case ACPI_TYPE_PROCESSOR:
1475                 *type = ACPI_BUS_TYPE_PROCESSOR;
1476                 status = acpi_bus_get_status_handle(handle, sta);
1477                 if (ACPI_FAILURE(status))
1478                         return -ENODEV;
1479                 break;
1480         case ACPI_TYPE_THERMAL:
1481                 *type = ACPI_BUS_TYPE_THERMAL;
1482                 *sta = ACPI_STA_DEFAULT;
1483                 break;
1484         case ACPI_TYPE_POWER:
1485                 *type = ACPI_BUS_TYPE_POWER;
1486                 *sta = ACPI_STA_DEFAULT;
1487                 break;
1488         default:
1489                 return -ENODEV;
1490         }
1491
1492         return 0;
1493 }
1494
1495 bool acpi_device_is_present(struct acpi_device *adev)
1496 {
1497         if (adev->status.present || adev->status.functional)
1498                 return true;
1499
1500         adev->flags.initialized = false;
1501         return false;
1502 }
1503
1504 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1505                                        const char *idstr,
1506                                        const struct acpi_device_id **matchid)
1507 {
1508         const struct acpi_device_id *devid;
1509
1510         if (handler->match)
1511                 return handler->match(idstr, matchid);
1512
1513         for (devid = handler->ids; devid->id[0]; devid++)
1514                 if (!strcmp((char *)devid->id, idstr)) {
1515                         if (matchid)
1516                                 *matchid = devid;
1517
1518                         return true;
1519                 }
1520
1521         return false;
1522 }
1523
1524 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1525                                         const struct acpi_device_id **matchid)
1526 {
1527         struct acpi_scan_handler *handler;
1528
1529         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1530                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1531                         return handler;
1532
1533         return NULL;
1534 }
1535
1536 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1537 {
1538         if (!!hotplug->enabled == !!val)
1539                 return;
1540
1541         mutex_lock(&acpi_scan_lock);
1542
1543         hotplug->enabled = val;
1544
1545         mutex_unlock(&acpi_scan_lock);
1546 }
1547
1548 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1549 {
1550         struct acpi_hardware_id *hwid;
1551
1552         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1553                 acpi_dock_add(adev);
1554                 return;
1555         }
1556         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1557                 struct acpi_scan_handler *handler;
1558
1559                 handler = acpi_scan_match_handler(hwid->id, NULL);
1560                 if (handler) {
1561                         adev->flags.hotplug_notify = true;
1562                         break;
1563                 }
1564         }
1565 }
1566
1567 static void acpi_device_dep_initialize(struct acpi_device *adev)
1568 {
1569         struct acpi_dep_data *dep;
1570         struct acpi_handle_list dep_devices;
1571         acpi_status status;
1572         int i;
1573
1574         if (!acpi_has_method(adev->handle, "_DEP"))
1575                 return;
1576
1577         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1578                                         &dep_devices);
1579         if (ACPI_FAILURE(status)) {
1580                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1581                 return;
1582         }
1583
1584         for (i = 0; i < dep_devices.count; i++) {
1585                 struct acpi_device_info *info;
1586                 int skip;
1587
1588                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1589                 if (ACPI_FAILURE(status)) {
1590                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1591                         continue;
1592                 }
1593
1594                 /*
1595                  * Skip the dependency of Windows System Power
1596                  * Management Controller
1597                  */
1598                 skip = info->valid & ACPI_VALID_HID &&
1599                         !strcmp(info->hardware_id.string, "INT3396");
1600
1601                 kfree(info);
1602
1603                 if (skip)
1604                         continue;
1605
1606                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1607                 if (!dep)
1608                         return;
1609
1610                 dep->master = dep_devices.handles[i];
1611                 dep->slave  = adev->handle;
1612                 adev->dep_unmet++;
1613
1614                 mutex_lock(&acpi_dep_list_lock);
1615                 list_add_tail(&dep->node , &acpi_dep_list);
1616                 mutex_unlock(&acpi_dep_list_lock);
1617         }
1618 }
1619
1620 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1621                                       void *not_used, void **return_value)
1622 {
1623         struct acpi_device *device = NULL;
1624         int type;
1625         unsigned long long sta;
1626         int result;
1627
1628         acpi_bus_get_device(handle, &device);
1629         if (device)
1630                 goto out;
1631
1632         result = acpi_bus_type_and_status(handle, &type, &sta);
1633         if (result)
1634                 return AE_OK;
1635
1636         if (type == ACPI_BUS_TYPE_POWER) {
1637                 acpi_add_power_resource(handle);
1638                 return AE_OK;
1639         }
1640
1641         acpi_add_single_object(&device, handle, type, sta);
1642         if (!device)
1643                 return AE_CTRL_DEPTH;
1644
1645         acpi_scan_init_hotplug(device);
1646         acpi_device_dep_initialize(device);
1647
1648  out:
1649         if (!*return_value)
1650                 *return_value = device;
1651
1652         return AE_OK;
1653 }
1654
1655 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
1656 {
1657         bool *is_spi_i2c_slave_p = data;
1658
1659         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1660                 return 1;
1661
1662         /*
1663          * devices that are connected to UART still need to be enumerated to
1664          * platform bus
1665          */
1666         if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
1667                 *is_spi_i2c_slave_p = true;
1668
1669          /* no need to do more checking */
1670         return -1;
1671 }
1672
1673 static void acpi_default_enumeration(struct acpi_device *device)
1674 {
1675         struct list_head resource_list;
1676         bool is_spi_i2c_slave = false;
1677
1678         /*
1679          * Do not enemerate SPI/I2C slaves as they will be enuerated by their
1680          * respective parents.
1681          */
1682         INIT_LIST_HEAD(&resource_list);
1683         acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
1684                                &is_spi_i2c_slave);
1685         acpi_dev_free_resource_list(&resource_list);
1686         if (!is_spi_i2c_slave)
1687                 acpi_create_platform_device(device);
1688 }
1689
1690 static const struct acpi_device_id generic_device_ids[] = {
1691         {ACPI_DT_NAMESPACE_HID, },
1692         {"", },
1693 };
1694
1695 static int acpi_generic_device_attach(struct acpi_device *adev,
1696                                       const struct acpi_device_id *not_used)
1697 {
1698         /*
1699          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1700          * below can be unconditional.
1701          */
1702         if (adev->data.of_compatible)
1703                 acpi_default_enumeration(adev);
1704
1705         return 1;
1706 }
1707
1708 static struct acpi_scan_handler generic_device_handler = {
1709         .ids = generic_device_ids,
1710         .attach = acpi_generic_device_attach,
1711 };
1712
1713 static int acpi_scan_attach_handler(struct acpi_device *device)
1714 {
1715         struct acpi_hardware_id *hwid;
1716         int ret = 0;
1717
1718         list_for_each_entry(hwid, &device->pnp.ids, list) {
1719                 const struct acpi_device_id *devid;
1720                 struct acpi_scan_handler *handler;
1721
1722                 handler = acpi_scan_match_handler(hwid->id, &devid);
1723                 if (handler) {
1724                         if (!handler->attach) {
1725                                 device->pnp.type.platform_id = 0;
1726                                 continue;
1727                         }
1728                         device->handler = handler;
1729                         ret = handler->attach(device, devid);
1730                         if (ret > 0)
1731                                 break;
1732
1733                         device->handler = NULL;
1734                         if (ret < 0)
1735                                 break;
1736                 }
1737         }
1738
1739         return ret;
1740 }
1741
1742 static void acpi_bus_attach(struct acpi_device *device)
1743 {
1744         struct acpi_device *child;
1745         acpi_handle ejd;
1746         int ret;
1747
1748         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1749                 register_dock_dependent_device(device, ejd);
1750
1751         acpi_bus_get_status(device);
1752         /* Skip devices that are not present. */
1753         if (!acpi_device_is_present(device)) {
1754                 device->flags.visited = false;
1755                 device->flags.power_manageable = 0;
1756                 return;
1757         }
1758         if (device->handler)
1759                 goto ok;
1760
1761         if (!device->flags.initialized) {
1762                 device->flags.power_manageable =
1763                         device->power.states[ACPI_STATE_D0].flags.valid;
1764                 if (acpi_bus_init_power(device))
1765                         device->flags.power_manageable = 0;
1766
1767                 device->flags.initialized = true;
1768         }
1769         device->flags.visited = false;
1770         ret = acpi_scan_attach_handler(device);
1771         if (ret < 0)
1772                 return;
1773
1774         device->flags.match_driver = true;
1775         if (!ret) {
1776                 ret = device_attach(&device->dev);
1777                 if (ret < 0)
1778                         return;
1779
1780                 if (!ret && device->pnp.type.platform_id)
1781                         acpi_default_enumeration(device);
1782         }
1783         device->flags.visited = true;
1784
1785  ok:
1786         list_for_each_entry(child, &device->children, node)
1787                 acpi_bus_attach(child);
1788
1789         if (device->handler && device->handler->hotplug.notify_online)
1790                 device->handler->hotplug.notify_online(device);
1791 }
1792
1793 void acpi_walk_dep_device_list(acpi_handle handle)
1794 {
1795         struct acpi_dep_data *dep, *tmp;
1796         struct acpi_device *adev;
1797
1798         mutex_lock(&acpi_dep_list_lock);
1799         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
1800                 if (dep->master == handle) {
1801                         acpi_bus_get_device(dep->slave, &adev);
1802                         if (!adev)
1803                                 continue;
1804
1805                         adev->dep_unmet--;
1806                         if (!adev->dep_unmet)
1807                                 acpi_bus_attach(adev);
1808                         list_del(&dep->node);
1809                         kfree(dep);
1810                 }
1811         }
1812         mutex_unlock(&acpi_dep_list_lock);
1813 }
1814 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
1815
1816 /**
1817  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1818  * @handle: Root of the namespace scope to scan.
1819  *
1820  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1821  * found devices.
1822  *
1823  * If no devices were found, -ENODEV is returned, but it does not mean that
1824  * there has been a real error.  There just have been no suitable ACPI objects
1825  * in the table trunk from which the kernel could create a device and add an
1826  * appropriate driver.
1827  *
1828  * Must be called under acpi_scan_lock.
1829  */
1830 int acpi_bus_scan(acpi_handle handle)
1831 {
1832         void *device = NULL;
1833
1834         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1835                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1836                                     acpi_bus_check_add, NULL, NULL, &device);
1837
1838         if (device) {
1839                 acpi_bus_attach(device);
1840                 return 0;
1841         }
1842         return -ENODEV;
1843 }
1844 EXPORT_SYMBOL(acpi_bus_scan);
1845
1846 /**
1847  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
1848  * @adev: Root of the ACPI namespace scope to walk.
1849  *
1850  * Must be called under acpi_scan_lock.
1851  */
1852 void acpi_bus_trim(struct acpi_device *adev)
1853 {
1854         struct acpi_scan_handler *handler = adev->handler;
1855         struct acpi_device *child;
1856
1857         list_for_each_entry_reverse(child, &adev->children, node)
1858                 acpi_bus_trim(child);
1859
1860         adev->flags.match_driver = false;
1861         if (handler) {
1862                 if (handler->detach)
1863                         handler->detach(adev);
1864
1865                 adev->handler = NULL;
1866         } else {
1867                 device_release_driver(&adev->dev);
1868         }
1869         /*
1870          * Most likely, the device is going away, so put it into D3cold before
1871          * that.
1872          */
1873         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
1874         adev->flags.initialized = false;
1875         adev->flags.visited = false;
1876 }
1877 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1878
1879 static int acpi_bus_scan_fixed(void)
1880 {
1881         int result = 0;
1882
1883         /*
1884          * Enumerate all fixed-feature devices.
1885          */
1886         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1887                 struct acpi_device *device = NULL;
1888
1889                 result = acpi_add_single_object(&device, NULL,
1890                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1891                                                 ACPI_STA_DEFAULT);
1892                 if (result)
1893                         return result;
1894
1895                 device->flags.match_driver = true;
1896                 result = device_attach(&device->dev);
1897                 if (result < 0)
1898                         return result;
1899
1900                 device_init_wakeup(&device->dev, true);
1901         }
1902
1903         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1904                 struct acpi_device *device = NULL;
1905
1906                 result = acpi_add_single_object(&device, NULL,
1907                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1908                                                 ACPI_STA_DEFAULT);
1909                 if (result)
1910                         return result;
1911
1912                 device->flags.match_driver = true;
1913                 result = device_attach(&device->dev);
1914         }
1915
1916         return result < 0 ? result : 0;
1917 }
1918
1919 int __init acpi_scan_init(void)
1920 {
1921         int result;
1922
1923         acpi_pci_root_init();
1924         acpi_pci_link_init();
1925         acpi_processor_init();
1926         acpi_lpss_init();
1927         acpi_apd_init();
1928         acpi_cmos_rtc_init();
1929         acpi_container_init();
1930         acpi_memory_hotplug_init();
1931         acpi_pnp_init();
1932         acpi_int340x_thermal_init();
1933         acpi_amba_init();
1934
1935         acpi_scan_add_handler(&generic_device_handler);
1936
1937         mutex_lock(&acpi_scan_lock);
1938         /*
1939          * Enumerate devices in the ACPI namespace.
1940          */
1941         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1942         if (result)
1943                 goto out;
1944
1945         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1946         if (result)
1947                 goto out;
1948
1949         /* Fixed feature devices do not exist on HW-reduced platform */
1950         if (!acpi_gbl_reduced_hardware) {
1951                 result = acpi_bus_scan_fixed();
1952                 if (result) {
1953                         acpi_detach_data(acpi_root->handle,
1954                                          acpi_scan_drop_device);
1955                         acpi_device_del(acpi_root);
1956                         put_device(&acpi_root->dev);
1957                         goto out;
1958                 }
1959         }
1960
1961         acpi_update_all_gpes();
1962
1963  out:
1964         mutex_unlock(&acpi_scan_lock);
1965         return result;
1966 }
1967
1968 static struct acpi_probe_entry *ape;
1969 static int acpi_probe_count;
1970 static DEFINE_SPINLOCK(acpi_probe_lock);
1971
1972 static int __init acpi_match_madt(struct acpi_subtable_header *header,
1973                                   const unsigned long end)
1974 {
1975         if (!ape->subtable_valid || ape->subtable_valid(header, ape))
1976                 if (!ape->probe_subtbl(header, end))
1977                         acpi_probe_count++;
1978
1979         return 0;
1980 }
1981
1982 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
1983 {
1984         int count = 0;
1985
1986         if (acpi_disabled)
1987                 return 0;
1988
1989         spin_lock(&acpi_probe_lock);
1990         for (ape = ap_head; nr; ape++, nr--) {
1991                 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
1992                         acpi_probe_count = 0;
1993                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
1994                         count += acpi_probe_count;
1995                 } else {
1996                         int res;
1997                         res = acpi_table_parse(ape->id, ape->probe_table);
1998                         if (!res)
1999                                 count++;
2000                 }
2001         }
2002         spin_unlock(&acpi_probe_lock);
2003
2004         return count;
2005 }