Pileus Git - ~andy/linux/blob - 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
  15 #include <acpi/acpi_drivers.h>
  16
  17 #include "internal.h"
  18
  19 #define _COMPONENT              ACPI_BUS_COMPONENT
  20 ACPI_MODULE_NAME("scan");
  21 #define STRUCT_TO_INT(s)        (*((int*)&s))
  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 /*
  31  * If set, devices will be hot-removed even if they cannot be put offline
  32  * gracefully (from the kernel's standpoint).
  33  */
  34 bool acpi_force_hot_remove;
  35
  36 static const char *dummy_hid = "device";
  37
  38 static 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
  44 struct acpi_device_bus_id{
  45         char bus_id[15];
  46         unsigned int instance_no;
  47         struct list_head node;
  48 };
  49
  50 void acpi_scan_lock_acquire(void)
  51 {
  52         mutex_lock(&acpi_scan_lock);
  53 }
  54 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  55
  56 void acpi_scan_lock_release(void)
  57 {
  58         mutex_unlock(&acpi_scan_lock);
  59 }
  60 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  61
  62 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  63 {
  64         if (!handler || !handler->attach)
  65                 return -EINVAL;
  66
  67         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  68         return 0;
  69 }
  70
  71 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
  72                                        const char *hotplug_profile_name)
  73 {
  74         int error;
  75
  76         error = acpi_scan_add_handler(handler);
  77         if (error)
  78                 return error;
  79
  80         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
  81         return 0;
  82 }
  83
  84 /*
  85  * Creates hid/cid(s) string needed for modalias and uevent
  86  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  87  * char *modalias: "acpi:IBM0001:ACPI0001"
  88 */
  89 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  90                            int size)
  91 {
  92         int len;
  93         int count;
  94         struct acpi_hardware_id *id;
  95
  96         if (list_empty(&acpi_dev->pnp.ids))
  97                 return 0;
  98
  99         len = snprintf(modalias, size, "acpi:");
 100         size -= len;
 101
 102         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
 103                 count = snprintf(&modalias[len], size, "%s:", id->id);
 104                 if (count < 0 || count >= size)
 105                         return -EINVAL;
 106                 len += count;
 107                 size -= count;
 108         }
 109
 110         modalias[len] = '\0';
 111         return len;
 112 }
 113
 114 static ssize_t
 115 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
 116         struct acpi_device *acpi_dev = to_acpi_device(dev);
 117         int len;
 118
 119         /* Device has no HID and no CID or string is >1024 */
 120         len = create_modalias(acpi_dev, buf, 1024);
 121         if (len <= 0)
 122                 return 0;
 123         buf[len++] = '\n';
 124         return len;
 125 }
 126 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 127
 128 static acpi_status acpi_bus_offline_companions(acpi_handle handle, u32 lvl,
 129                                                void *data, void **ret_p)
 130 {
 131         struct acpi_device *device = NULL;
 132         struct acpi_device_physical_node *pn;
 133         bool second_pass = (bool)data;
 134         acpi_status status = AE_OK;
 135
 136         if (acpi_bus_get_device(handle, &device))
 137                 return AE_OK;
 138
 139         mutex_lock(&device->physical_node_lock);
 140
 141         list_for_each_entry(pn, &device->physical_node_list, node) {
 142                 int ret;
 143
 144                 if (second_pass) {
 145                         /* Skip devices offlined by the first pass. */
 146                         if (pn->put_online)
 147                                 continue;
 148                 } else {
 149                         pn->put_online = false;
 150                 }
 151                 ret = device_offline(pn->dev);
 152                 if (acpi_force_hot_remove)
 153                         continue;
 154
 155                 if (ret >= 0) {
 156                         pn->put_online = !ret;
 157                 } else {
 158                         *ret_p = pn->dev;
 159                         if (second_pass) {
 160                                 status = AE_ERROR;
 161                                 break;
 162                         }
 163                 }
 164         }
 165
 166         mutex_unlock(&device->physical_node_lock);
 167
 168         return status;
 169 }
 170
 171 static acpi_status acpi_bus_online_companions(acpi_handle handle, u32 lvl,
 172                                               void *data, void **ret_p)
 173 {
 174         struct acpi_device *device = NULL;
 175         struct acpi_device_physical_node *pn;
 176
 177         if (acpi_bus_get_device(handle, &device))
 178                 return AE_OK;
 179
 180         mutex_lock(&device->physical_node_lock);
 181
 182         list_for_each_entry(pn, &device->physical_node_list, node)
 183                 if (pn->put_online) {
 184                         device_online(pn->dev);
 185                         pn->put_online = false;
 186                 }
 187
 188         mutex_unlock(&device->physical_node_lock);
 189
 190         return AE_OK;
 191 }
 192
 193 static int acpi_scan_hot_remove(struct acpi_device *device)
 194 {
 195         acpi_handle handle = device->handle;
 196         struct device *errdev;
 197         acpi_status status;
 198         unsigned long long sta;
 199
 200         /* If there is no handle, the device node has been unregistered. */
 201         if (!handle) {
 202                 dev_dbg(&device->dev, "ACPI handle missing\n");
 203                 put_device(&device->dev);
 204                 return -EINVAL;
 205         }
 206
 207         lock_device_hotplug();
 208
 209         /*
 210          * Carry out two passes here and ignore errors in the first pass,
 211          * because if the devices in question are memory blocks and
 212          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 213          * that the other blocks depend on, but it is not known in advance which
 214          * block holds them.
 215          *
 216          * If the first pass is successful, the second one isn't needed, though.
 217          */
 218         errdev = NULL;
 219         acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 220                             NULL, acpi_bus_offline_companions,
 221                             (void *)false, (void **)&errdev);
 222         acpi_bus_offline_companions(handle, 0, (void *)false, (void **)&errdev);
 223         if (errdev) {
 224                 errdev = NULL;
 225                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 226                                     NULL, acpi_bus_offline_companions,
 227                                     (void *)true , (void **)&errdev);
 228                 if (!errdev || acpi_force_hot_remove)
 229                         acpi_bus_offline_companions(handle, 0, (void *)true,
 230                                                     (void **)&errdev);
 231
 232                 if (errdev && !acpi_force_hot_remove) {
 233                         dev_warn(errdev, "Offline failed.\n");
 234                         acpi_bus_online_companions(handle, 0, NULL, NULL);
 235                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 236                                             ACPI_UINT32_MAX,
 237                                             acpi_bus_online_companions, NULL,
 238                                             NULL, NULL);
 239
 240                         unlock_device_hotplug();
 241
 242                         put_device(&device->dev);
 243                         return -EBUSY;
 244                 }
 245         }
 246
 247         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 248                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 249
 250         acpi_bus_trim(device);
 251
 252         unlock_device_hotplug();
 253
 254         /* Device node has been unregistered. */
 255         put_device(&device->dev);
 256         device = NULL;
 257
 258         acpi_evaluate_lck(handle, 0);
 259         /*
 260          * TBD: _EJD support.
 261          */
 262         status = acpi_evaluate_ej0(handle);
 263         if (status == AE_NOT_FOUND)
 264                 return -ENODEV;
 265         else if (ACPI_FAILURE(status))
 266                 return -EIO;
 267
 268         /*
 269          * Verify if eject was indeed successful.  If not, log an error
 270          * message.  No need to call _OST since _EJ0 call was made OK.
 271          */
 272         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 273         if (ACPI_FAILURE(status)) {
 274                 acpi_handle_warn(handle,
 275                         "Status check after eject failed (0x%x)\n", status);
 276         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 277                 acpi_handle_warn(handle,
 278                         "Eject incomplete - status 0x%llx\n", sta);
 279         }
 280
 281         return 0;
 282 }
 283
 284 static void acpi_bus_device_eject(void *context)
 285 {
 286         acpi_handle handle = context;
 287         struct acpi_device *device = NULL;
 288         struct acpi_scan_handler *handler;
 289         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 290
 291         mutex_lock(&acpi_scan_lock);
 292
 293         acpi_bus_get_device(handle, &device);
 294         if (!device)
 295                 goto err_out;
 296
 297         handler = device->handler;
 298         if (!handler || !handler->hotplug.enabled) {
 299                 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 300                 goto err_out;
 301         }
 302         acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
 303                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 304         if (handler->hotplug.mode == AHM_CONTAINER) {
 305                 device->flags.eject_pending = true;
 306                 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 307         } else {
 308                 int error;
 309
 310                 get_device(&device->dev);
 311                 error = acpi_scan_hot_remove(device);
 312                 if (error)
 313                         goto err_out;
 314         }
 315
 316  out:
 317         mutex_unlock(&acpi_scan_lock);
 318         return;
 319
 320  err_out:
 321         acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
 322                                   NULL);
 323         goto out;
 324 }
 325
 326 static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
 327 {
 328         struct acpi_device *device = NULL;
 329         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 330         int error;
 331
 332         mutex_lock(&acpi_scan_lock);
 333         lock_device_hotplug();
 334
 335         if (ost_source != ACPI_NOTIFY_BUS_CHECK) {
 336                 acpi_bus_get_device(handle, &device);
 337                 if (device) {
 338                         dev_warn(&device->dev, "Attempt to re-insert\n");
 339                         goto out;
 340                 }
 341         }
 342         acpi_evaluate_hotplug_ost(handle, ost_source,
 343                                   ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
 344         error = acpi_bus_scan(handle);
 345         if (error) {
 346                 acpi_handle_warn(handle, "Namespace scan failure\n");
 347                 goto out;
 348         }
 349         error = acpi_bus_get_device(handle, &device);
 350         if (error) {
 351                 acpi_handle_warn(handle, "Missing device node object\n");
 352                 goto out;
 353         }
 354         ost_code = ACPI_OST_SC_SUCCESS;
 355         if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
 356                 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 357
 358  out:
 359         unlock_device_hotplug();
 360         acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
 361         mutex_unlock(&acpi_scan_lock);
 362 }
 363
 364 static void acpi_scan_bus_check(void *context)
 365 {
 366         acpi_scan_bus_device_check((acpi_handle)context,
 367                                    ACPI_NOTIFY_BUS_CHECK);
 368 }
 369
 370 static void acpi_scan_device_check(void *context)
 371 {
 372         acpi_scan_bus_device_check((acpi_handle)context,
 373                                    ACPI_NOTIFY_DEVICE_CHECK);
 374 }
 375
 376 static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
 377 {
 378         u32 ost_status;
 379
 380         switch (type) {
 381         case ACPI_NOTIFY_BUS_CHECK:
 382                 acpi_handle_debug(handle,
 383                         "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
 384                 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
 385                 break;
 386         case ACPI_NOTIFY_DEVICE_CHECK:
 387                 acpi_handle_debug(handle,
 388                         "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
 389                 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
 390                 break;
 391         case ACPI_NOTIFY_EJECT_REQUEST:
 392                 acpi_handle_debug(handle,
 393                         "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
 394                 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 395                 break;
 396         default:
 397                 /* non-hotplug event; possibly handled by other handler */
 398                 return;
 399         }
 400
 401         acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
 402 }
 403
 404 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
 405 {
 406         acpi_osd_exec_callback callback;
 407         struct acpi_scan_handler *handler = data;
 408         acpi_status status;
 409
 410         if (!handler->hotplug.enabled)
 411                 return acpi_hotplug_unsupported(handle, type);
 412
 413         switch (type) {
 414         case ACPI_NOTIFY_BUS_CHECK:
 415                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 416                 callback = acpi_scan_bus_check;
 417                 break;
 418         case ACPI_NOTIFY_DEVICE_CHECK:
 419                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 420                 callback = acpi_scan_device_check;
 421                 break;
 422         case ACPI_NOTIFY_EJECT_REQUEST:
 423                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 424                 callback = acpi_bus_device_eject;
 425                 break;
 426         default:
 427                 /* non-hotplug event; possibly handled by other handler */
 428                 return;
 429         }
 430         status = acpi_os_hotplug_execute(callback, handle);
 431         if (ACPI_FAILURE(status))
 432                 acpi_evaluate_hotplug_ost(handle, type,
 433                                           ACPI_OST_SC_NON_SPECIFIC_FAILURE,
 434                                           NULL);
 435 }
 436
 437 /**
 438  * acpi_bus_hot_remove_device: hot-remove a device and its children
 439  * @context: struct acpi_eject_event pointer (freed in this func)
 440  *
 441  * Hot-remove a device and its children. This function frees up the
 442  * memory space passed by arg context, so that the caller may call
 443  * this function asynchronously through acpi_os_hotplug_execute().
 444  */
 445 void acpi_bus_hot_remove_device(void *context)
 446 {
 447         struct acpi_eject_event *ej_event = context;
 448         struct acpi_device *device = ej_event->device;
 449         acpi_handle handle = device->handle;
 450         int error;
 451
 452         mutex_lock(&acpi_scan_lock);
 453
 454         error = acpi_scan_hot_remove(device);
 455         if (error && handle)
 456                 acpi_evaluate_hotplug_ost(handle, ej_event->event,
 457                                           ACPI_OST_SC_NON_SPECIFIC_FAILURE,
 458                                           NULL);
 459
 460         mutex_unlock(&acpi_scan_lock);
 461         kfree(context);
 462 }
 463 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 464
 465 static ssize_t real_power_state_show(struct device *dev,
 466                                      struct device_attribute *attr, char *buf)
 467 {
 468         struct acpi_device *adev = to_acpi_device(dev);
 469         int state;
 470         int ret;
 471
 472         ret = acpi_device_get_power(adev, &state);
 473         if (ret)
 474                 return ret;
 475
 476         return sprintf(buf, "%s\n", acpi_power_state_string(state));
 477 }
 478
 479 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 480
 481 static ssize_t power_state_show(struct device *dev,
 482                                 struct device_attribute *attr, char *buf)
 483 {
 484         struct acpi_device *adev = to_acpi_device(dev);
 485
 486         return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 487 }
 488
 489 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 490
 491 static ssize_t
 492 acpi_eject_store(struct device *d, struct device_attribute *attr,
 493                 const char *buf, size_t count)
 494 {
 495         struct acpi_device *acpi_device = to_acpi_device(d);
 496         struct acpi_eject_event *ej_event;
 497         acpi_object_type not_used;
 498         acpi_status status;
 499         u32 ost_source;
 500         int ret;
 501
 502         if (!count || buf[0] != '1')
 503                 return -EINVAL;
 504
 505         if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
 506             && !acpi_device->driver)
 507                 return -ENODEV;
 508
 509         status = acpi_get_type(acpi_device->handle, &not_used);
 510         if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
 511                 return -ENODEV;
 512
 513         mutex_lock(&acpi_scan_lock);
 514
 515         if (acpi_device->flags.eject_pending) {
 516                 /* ACPI eject notification event. */
 517                 ost_source = ACPI_NOTIFY_EJECT_REQUEST;
 518                 acpi_device->flags.eject_pending = 0;
 519         } else {
 520                 /* Eject initiated by user space. */
 521                 ost_source = ACPI_OST_EC_OSPM_EJECT;
 522         }
 523         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 524         if (!ej_event) {
 525                 ret = -ENOMEM;
 526                 goto err_out;
 527         }
 528         acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
 529                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 530         ej_event->device = acpi_device;
 531         ej_event->event = ost_source;
 532         get_device(&acpi_device->dev);
 533         status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
 534         if (ACPI_FAILURE(status)) {
 535                 put_device(&acpi_device->dev);
 536                 kfree(ej_event);
 537                 ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
 538                 goto err_out;
 539         }
 540         ret = count;
 541
 542  out:
 543         mutex_unlock(&acpi_scan_lock);
 544         return ret;
 545
 546  err_out:
 547         acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
 548                                   ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 549         goto out;
 550 }
 551
 552 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 553
 554 static ssize_t
 555 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 556         struct acpi_device *acpi_dev = to_acpi_device(dev);
 557
 558         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 559 }
 560 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 561
 562 static ssize_t acpi_device_uid_show(struct device *dev,
 563                                     struct device_attribute *attr, char *buf)
 564 {
 565         struct acpi_device *acpi_dev = to_acpi_device(dev);
 566
 567         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 568 }
 569 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 570
 571 static ssize_t acpi_device_adr_show(struct device *dev,
 572                                     struct device_attribute *attr, char *buf)
 573 {
 574         struct acpi_device *acpi_dev = to_acpi_device(dev);
 575
 576         return sprintf(buf, "0x%08x\n",
 577                        (unsigned int)(acpi_dev->pnp.bus_address));
 578 }
 579 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 580
 581 static ssize_t
 582 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 583         struct acpi_device *acpi_dev = to_acpi_device(dev);
 584         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 585         int result;
 586
 587         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 588         if (result)
 589                 goto end;
 590
 591         result = sprintf(buf, "%s\n", (char*)path.pointer);
 592         kfree(path.pointer);
 593 end:
 594         return result;
 595 }
 596 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 597
 598 /* sysfs file that shows description text from the ACPI _STR method */
 599 static ssize_t description_show(struct device *dev,
 600                                 struct device_attribute *attr,
 601                                 char *buf) {
 602         struct acpi_device *acpi_dev = to_acpi_device(dev);
 603         int result;
 604
 605         if (acpi_dev->pnp.str_obj == NULL)
 606                 return 0;
 607
 608         /*
 609          * The _STR object contains a Unicode identifier for a device.
 610          * We need to convert to utf-8 so it can be displayed.
 611          */
 612         result = utf16s_to_utf8s(
 613                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 614                 acpi_dev->pnp.str_obj->buffer.length,
 615                 UTF16_LITTLE_ENDIAN, buf,
 616                 PAGE_SIZE);
 617
 618         buf[result++] = '\n';
 619
 620         return result;
 621 }
 622 static DEVICE_ATTR(description, 0444, description_show, NULL);
 623
 624 static ssize_t
 625 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 626                      char *buf) {
 627         struct acpi_device *acpi_dev = to_acpi_device(dev);
 628
 629         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 630 }
 631 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 632
 633 static int acpi_device_setup_files(struct acpi_device *dev)
 634 {
 635         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 636         acpi_status status;
 637         unsigned long long sun;
 638         int result = 0;
 639
 640         /*
 641          * Devices gotten from FADT don't have a "path" attribute
 642          */
 643         if (dev->handle) {
 644                 result = device_create_file(&dev->dev, &dev_attr_path);
 645                 if (result)
 646                         goto end;
 647         }
 648
 649         if (!list_empty(&dev->pnp.ids)) {
 650                 result = device_create_file(&dev->dev, &dev_attr_hid);
 651                 if (result)
 652                         goto end;
 653
 654                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 655                 if (result)
 656                         goto end;
 657         }
 658
 659         /*
 660          * If device has _STR, 'description' file is created
 661          */
 662         if (acpi_has_method(dev->handle, "_STR")) {
 663                 status = acpi_evaluate_object(dev->handle, "_STR",
 664                                         NULL, &buffer);
 665                 if (ACPI_FAILURE(status))
 666                         buffer.pointer = NULL;
 667                 dev->pnp.str_obj = buffer.pointer;
 668                 result = device_create_file(&dev->dev, &dev_attr_description);
 669                 if (result)
 670                         goto end;
 671         }
 672
 673         if (dev->pnp.type.bus_address)
 674                 result = device_create_file(&dev->dev, &dev_attr_adr);
 675         if (dev->pnp.unique_id)
 676                 result = device_create_file(&dev->dev, &dev_attr_uid);
 677
 678         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 679         if (ACPI_SUCCESS(status)) {
 680                 dev->pnp.sun = (unsigned long)sun;
 681                 result = device_create_file(&dev->dev, &dev_attr_sun);
 682                 if (result)
 683                         goto end;
 684         } else {
 685                 dev->pnp.sun = (unsigned long)-1;
 686         }
 687
 688         /*
 689          * If device has _EJ0, 'eject' file is created that is used to trigger
 690          * hot-removal function from userland.
 691          */
 692         if (acpi_has_method(dev->handle, "_EJ0")) {
 693                 result = device_create_file(&dev->dev, &dev_attr_eject);
 694                 if (result)
 695                         return result;
 696         }
 697
 698         if (dev->flags.power_manageable) {
 699                 result = device_create_file(&dev->dev, &dev_attr_power_state);
 700                 if (result)
 701                         return result;
 702
 703                 if (dev->power.flags.power_resources)
 704                         result = device_create_file(&dev->dev,
 705                                                     &dev_attr_real_power_state);
 706         }
 707
 708 end:
 709         return result;
 710 }
 711
 712 static void acpi_device_remove_files(struct acpi_device *dev)
 713 {
 714         if (dev->flags.power_manageable) {
 715                 device_remove_file(&dev->dev, &dev_attr_power_state);
 716                 if (dev->power.flags.power_resources)
 717                         device_remove_file(&dev->dev,
 718                                            &dev_attr_real_power_state);
 719         }
 720
 721         /*
 722          * If device has _STR, remove 'description' file
 723          */
 724         if (acpi_has_method(dev->handle, "_STR")) {
 725                 kfree(dev->pnp.str_obj);
 726                 device_remove_file(&dev->dev, &dev_attr_description);
 727         }
 728         /*
 729          * If device has _EJ0, remove 'eject' file.
 730          */
 731         if (acpi_has_method(dev->handle, "_EJ0"))
 732                 device_remove_file(&dev->dev, &dev_attr_eject);
 733
 734         if (acpi_has_method(dev->handle, "_SUN"))
 735                 device_remove_file(&dev->dev, &dev_attr_sun);
 736
 737         if (dev->pnp.unique_id)
 738                 device_remove_file(&dev->dev, &dev_attr_uid);
 739         if (dev->pnp.type.bus_address)
 740                 device_remove_file(&dev->dev, &dev_attr_adr);
 741         device_remove_file(&dev->dev, &dev_attr_modalias);
 742         device_remove_file(&dev->dev, &dev_attr_hid);
 743         if (dev->handle)
 744                 device_remove_file(&dev->dev, &dev_attr_path);
 745 }
 746 /* --------------------------------------------------------------------------
 747                         ACPI Bus operations
 748    -------------------------------------------------------------------------- */
 749
 750 static const struct acpi_device_id *__acpi_match_device(
 751         struct acpi_device *device, const struct acpi_device_id *ids)
 752 {
 753         const struct acpi_device_id *id;
 754         struct acpi_hardware_id *hwid;
 755
 756         /*
 757          * If the device is not present, it is unnecessary to load device
 758          * driver for it.
 759          */
 760         if (!device->status.present)
 761                 return NULL;
 762
 763         for (id = ids; id->id[0]; id++)
 764                 list_for_each_entry(hwid, &device->pnp.ids, list)
 765                         if (!strcmp((char *) id->id, hwid->id))
 766                                 return id;
 767
 768         return NULL;
 769 }
 770
 771 /**
 772  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 773  * @ids: Array of struct acpi_device_id object to match against.
 774  * @dev: The device structure to match.
 775  *
 776  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 777  * object for that handle and use that object to match against a given list of
 778  * device IDs.
 779  *
 780  * Return a pointer to the first matching ID on success or %NULL on failure.
 781  */
 782 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 783                                                const struct device *dev)
 784 {
 785         struct acpi_device *adev;
 786         acpi_handle handle = ACPI_HANDLE(dev);
 787
 788         if (!ids || !handle || acpi_bus_get_device(handle, &adev))
 789                 return NULL;
 790
 791         return __acpi_match_device(adev, ids);
 792 }
 793 EXPORT_SYMBOL_GPL(acpi_match_device);
 794
 795 int acpi_match_device_ids(struct acpi_device *device,
 796                           const struct acpi_device_id *ids)
 797 {
 798         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 799 }
 800 EXPORT_SYMBOL(acpi_match_device_ids);
 801
 802 static void acpi_free_power_resources_lists(struct acpi_device *device)
 803 {
 804         int i;
 805
 806         if (device->wakeup.flags.valid)
 807                 acpi_power_resources_list_free(&device->wakeup.resources);
 808
 809         if (!device->flags.power_manageable)
 810                 return;
 811
 812         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 813                 struct acpi_device_power_state *ps = &device->power.states[i];
 814                 acpi_power_resources_list_free(&ps->resources);
 815         }
 816 }
 817
 818 static void acpi_device_release(struct device *dev)
 819 {
 820         struct acpi_device *acpi_dev = to_acpi_device(dev);
 821
 822         acpi_free_pnp_ids(&acpi_dev->pnp);
 823         acpi_free_power_resources_lists(acpi_dev);
 824         kfree(acpi_dev);
 825 }
 826
 827 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 828 {
 829         struct acpi_device *acpi_dev = to_acpi_device(dev);
 830         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 831
 832         return acpi_dev->flags.match_driver
 833                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 834 }
 835
 836 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 837 {
 838         struct acpi_device *acpi_dev = to_acpi_device(dev);
 839         int len;
 840
 841         if (list_empty(&acpi_dev->pnp.ids))
 842                 return 0;
 843
 844         if (add_uevent_var(env, "MODALIAS="))
 845                 return -ENOMEM;
 846         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 847                               sizeof(env->buf) - env->buflen);
 848         if (len >= (sizeof(env->buf) - env->buflen))
 849                 return -ENOMEM;
 850         env->buflen += len;
 851         return 0;
 852 }
 853
 854 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 855 {
 856         struct acpi_device *device = data;
 857
 858         device->driver->ops.notify(device, event);
 859 }
 860
 861 static acpi_status acpi_device_notify_fixed(void *data)
 862 {
 863         struct acpi_device *device = data;
 864
 865         /* Fixed hardware devices have no handles */
 866         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 867         return AE_OK;
 868 }
 869
 870 static int acpi_device_install_notify_handler(struct acpi_device *device)
 871 {
 872         acpi_status status;
 873
 874         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 875                 status =
 876                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 877                                                      acpi_device_notify_fixed,
 878                                                      device);
 879         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 880                 status =
 881                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 882                                                      acpi_device_notify_fixed,
 883                                                      device);
 884         else
 885                 status = acpi_install_notify_handler(device->handle,
 886                                                      ACPI_DEVICE_NOTIFY,
 887                                                      acpi_device_notify,
 888                                                      device);
 889
 890         if (ACPI_FAILURE(status))
 891                 return -EINVAL;
 892         return 0;
 893 }
 894
 895 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 896 {
 897         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 898                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 899                                                 acpi_device_notify_fixed);
 900         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 901                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 902                                                 acpi_device_notify_fixed);
 903         else
 904                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 905                                            acpi_device_notify);
 906 }
 907
 908 static int acpi_device_probe(struct device *dev)
 909 {
 910         struct acpi_device *acpi_dev = to_acpi_device(dev);
 911         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 912         int ret;
 913
 914         if (acpi_dev->handler)
 915                 return -EINVAL;
 916
 917         if (!acpi_drv->ops.add)
 918                 return -ENOSYS;
 919
 920         ret = acpi_drv->ops.add(acpi_dev);
 921         if (ret)
 922                 return ret;
 923
 924         acpi_dev->driver = acpi_drv;
 925         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 926                           "Driver [%s] successfully bound to device [%s]\n",
 927                           acpi_drv->name, acpi_dev->pnp.bus_id));
 928
 929         if (acpi_drv->ops.notify) {
 930                 ret = acpi_device_install_notify_handler(acpi_dev);
 931                 if (ret) {
 932                         if (acpi_drv->ops.remove)
 933                                 acpi_drv->ops.remove(acpi_dev);
 934
 935                         acpi_dev->driver = NULL;
 936                         acpi_dev->driver_data = NULL;
 937                         return ret;
 938                 }
 939         }
 940
 941         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
 942                           acpi_drv->name, acpi_dev->pnp.bus_id));
 943         get_device(dev);
 944         return 0;
 945 }
 946
 947 static int acpi_device_remove(struct device * dev)
 948 {
 949         struct acpi_device *acpi_dev = to_acpi_device(dev);
 950         struct acpi_driver *acpi_drv = acpi_dev->driver;
 951
 952         if (acpi_drv) {
 953                 if (acpi_drv->ops.notify)
 954                         acpi_device_remove_notify_handler(acpi_dev);
 955                 if (acpi_drv->ops.remove)
 956                         acpi_drv->ops.remove(acpi_dev);
 957         }
 958         acpi_dev->driver = NULL;
 959         acpi_dev->driver_data = NULL;
 960
 961         put_device(dev);
 962         return 0;
 963 }
 964
 965 struct bus_type acpi_bus_type = {
 966         .name           = "acpi",
 967         .match          = acpi_bus_match,
 968         .probe          = acpi_device_probe,
 969         .remove         = acpi_device_remove,
 970         .uevent         = acpi_device_uevent,
 971 };
 972
 973 int acpi_device_add(struct acpi_device *device,
 974                     void (*release)(struct device *))
 975 {
 976         int result;
 977         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 978         int found = 0;
 979
 980         if (device->handle) {
 981                 acpi_status status;
 982
 983                 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
 984                                           device);
 985                 if (ACPI_FAILURE(status)) {
 986                         acpi_handle_err(device->handle,
 987                                         "Unable to attach device data\n");
 988                         return -ENODEV;
 989                 }
 990         }
 991
 992         /*
 993          * Linkage
 994          * -------
 995          * Link this device to its parent and siblings.
 996          */
 997         INIT_LIST_HEAD(&device->children);
 998         INIT_LIST_HEAD(&device->node);
 999         INIT_LIST_HEAD(&device->wakeup_list);
1000         INIT_LIST_HEAD(&device->physical_node_list);
1001         mutex_init(&device->physical_node_lock);
1002         INIT_LIST_HEAD(&device->power_dependent);
1003
1004         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1005         if (!new_bus_id) {
1006                 pr_err(PREFIX "Memory allocation error\n");
1007                 result = -ENOMEM;
1008                 goto err_detach;
1009         }
1010
1011         mutex_lock(&acpi_device_lock);
1012         /*
1013          * Find suitable bus_id and instance number in acpi_bus_id_list
1014          * If failed, create one and link it into acpi_bus_id_list
1015          */
1016         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1017                 if (!strcmp(acpi_device_bus_id->bus_id,
1018                             acpi_device_hid(device))) {
1019                         acpi_device_bus_id->instance_no++;
1020                         found = 1;
1021                         kfree(new_bus_id);
1022                         break;
1023                 }
1024         }
1025         if (!found) {
1026                 acpi_device_bus_id = new_bus_id;
1027                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1028                 acpi_device_bus_id->instance_no = 0;
1029                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1030         }
1031         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1032
1033         if (device->parent)
1034                 list_add_tail(&device->node, &device->parent->children);
1035
1036         if (device->wakeup.flags.valid)
1037                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1038         mutex_unlock(&acpi_device_lock);
1039
1040         if (device->parent)
1041                 device->dev.parent = &device->parent->dev;
1042         device->dev.bus = &acpi_bus_type;
1043         device->dev.release = release;
1044         result = device_add(&device->dev);
1045         if (result) {
1046                 dev_err(&device->dev, "Error registering device\n");
1047                 goto err;
1048         }
1049
1050         result = acpi_device_setup_files(device);
1051         if (result)
1052                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1053                        dev_name(&device->dev));
1054
1055         return 0;
1056
1057  err:
1058         mutex_lock(&acpi_device_lock);
1059         if (device->parent)
1060                 list_del(&device->node);
1061         list_del(&device->wakeup_list);
1062         mutex_unlock(&acpi_device_lock);
1063
1064  err_detach:
1065         acpi_detach_data(device->handle, acpi_bus_data_handler);
1066         return result;
1067 }
1068
1069 static void acpi_device_unregister(struct acpi_device *device)
1070 {
1071         mutex_lock(&acpi_device_lock);
1072         if (device->parent)
1073                 list_del(&device->node);
1074
1075         list_del(&device->wakeup_list);
1076         mutex_unlock(&acpi_device_lock);
1077
1078         acpi_detach_data(device->handle, acpi_bus_data_handler);
1079
1080         acpi_power_add_remove_device(device, false);
1081         acpi_device_remove_files(device);
1082         if (device->remove)
1083                 device->remove(device);
1084
1085         device_del(&device->dev);
1086         /*
1087          * Transition the device to D3cold to drop the reference counts of all
1088          * power resources the device depends on and turn off the ones that have
1089          * no more references.
1090          */
1091         acpi_device_set_power(device, ACPI_STATE_D3_COLD);
1092         device->handle = NULL;
1093         put_device(&device->dev);
1094 }
1095
1096 /* --------------------------------------------------------------------------
1097                                  Driver Management
1098    -------------------------------------------------------------------------- */
1099 /**
1100  * acpi_bus_register_driver - register a driver with the ACPI bus
1101  * @driver: driver being registered
1102  *
1103  * Registers a driver with the ACPI bus.  Searches the namespace for all
1104  * devices that match the driver's criteria and binds.  Returns zero for
1105  * success or a negative error status for failure.
1106  */
1107 int acpi_bus_register_driver(struct acpi_driver *driver)
1108 {
1109         int ret;
1110
1111         if (acpi_disabled)
1112                 return -ENODEV;
1113         driver->drv.name = driver->name;
1114         driver->drv.bus = &acpi_bus_type;
1115         driver->drv.owner = driver->owner;
1116
1117         ret = driver_register(&driver->drv);
1118         return ret;
1119 }
1120
1121 EXPORT_SYMBOL(acpi_bus_register_driver);
1122
1123 /**
1124  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1125  * @driver: driver to unregister
1126  *
1127  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
1128  * devices that match the driver's criteria and unbinds.
1129  */
1130 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1131 {
1132         driver_unregister(&driver->drv);
1133 }
1134
1135 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1136
1137 /* --------------------------------------------------------------------------
1138                                  Device Enumeration
1139    -------------------------------------------------------------------------- */
1140 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1141 {
1142         struct acpi_device *device = NULL;
1143         acpi_status status;
1144
1145         /*
1146          * Fixed hardware devices do not appear in the namespace and do not
1147          * have handles, but we fabricate acpi_devices for them, so we have
1148          * to deal with them specially.
1149          */
1150         if (!handle)
1151                 return acpi_root;
1152
1153         do {
1154                 status = acpi_get_parent(handle, &handle);
1155                 if (ACPI_FAILURE(status))
1156                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
1157         } while (acpi_bus_get_device(handle, &device));
1158         return device;
1159 }
1160
1161 acpi_status
1162 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1163 {
1164         acpi_status status;
1165         acpi_handle tmp;
1166         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1167         union acpi_object *obj;
1168
1169         status = acpi_get_handle(handle, "_EJD", &tmp);
1170         if (ACPI_FAILURE(status))
1171                 return status;
1172
1173         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1174         if (ACPI_SUCCESS(status)) {
1175                 obj = buffer.pointer;
1176                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1177                                          ejd);
1178                 kfree(buffer.pointer);
1179         }
1180         return status;
1181 }
1182 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1183
1184 void acpi_bus_data_handler(acpi_handle handle, void *context)
1185 {
1186
1187         /* TBD */
1188
1189         return;
1190 }
1191
1192 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1193                                         struct acpi_device_wakeup *wakeup)
1194 {
1195         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1196         union acpi_object *package = NULL;
1197         union acpi_object *element = NULL;
1198         acpi_status status;
1199         int err = -ENODATA;
1200
1201         if (!wakeup)
1202                 return -EINVAL;
1203
1204         INIT_LIST_HEAD(&wakeup->resources);
1205
1206         /* _PRW */
1207         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1208         if (ACPI_FAILURE(status)) {
1209                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1210                 return err;
1211         }
1212
1213         package = (union acpi_object *)buffer.pointer;
1214
1215         if (!package || package->package.count < 2)
1216                 goto out;
1217
1218         element = &(package->package.elements[0]);
1219         if (!element)
1220                 goto out;
1221
1222         if (element->type == ACPI_TYPE_PACKAGE) {
1223                 if ((element->package.count < 2) ||
1224                     (element->package.elements[0].type !=
1225                      ACPI_TYPE_LOCAL_REFERENCE)
1226                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1227                         goto out;
1228
1229                 wakeup->gpe_device =
1230                     element->package.elements[0].reference.handle;
1231                 wakeup->gpe_number =
1232                     (u32) element->package.elements[1].integer.value;
1233         } else if (element->type == ACPI_TYPE_INTEGER) {
1234                 wakeup->gpe_device = NULL;
1235                 wakeup->gpe_number = element->integer.value;
1236         } else {
1237                 goto out;
1238         }
1239
1240         element = &(package->package.elements[1]);
1241         if (element->type != ACPI_TYPE_INTEGER)
1242                 goto out;
1243
1244         wakeup->sleep_state = element->integer.value;
1245
1246         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1247         if (err)
1248                 goto out;
1249
1250         if (!list_empty(&wakeup->resources)) {
1251                 int sleep_state;
1252
1253                 err = acpi_power_wakeup_list_init(&wakeup->resources,
1254                                                   &sleep_state);
1255                 if (err) {
1256                         acpi_handle_warn(handle, "Retrieving current states "
1257                                          "of wakeup power resources failed\n");
1258                         acpi_power_resources_list_free(&wakeup->resources);
1259                         goto out;
1260                 }
1261                 if (sleep_state < wakeup->sleep_state) {
1262                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
1263                                          "(S%d) by S%d from power resources\n",
1264                                          (int)wakeup->sleep_state, sleep_state);
1265                         wakeup->sleep_state = sleep_state;
1266                 }
1267         }
1268         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1269
1270  out:
1271         kfree(buffer.pointer);
1272         return err;
1273 }
1274
1275 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1276 {
1277         struct acpi_device_id button_device_ids[] = {
1278                 {"PNP0C0C", 0},
1279                 {"PNP0C0D", 0},
1280                 {"PNP0C0E", 0},
1281                 {"", 0},
1282         };
1283         acpi_status status;
1284         acpi_event_status event_status;
1285
1286         device->wakeup.flags.notifier_present = 0;
1287
1288         /* Power button, Lid switch always enable wakeup */
1289         if (!acpi_match_device_ids(device, button_device_ids)) {
1290                 device->wakeup.flags.run_wake = 1;
1291                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1292                         /* Do not use Lid/sleep button for S5 wakeup */
1293                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
1294                                 device->wakeup.sleep_state = ACPI_STATE_S4;
1295                 }
1296                 device_set_wakeup_capable(&device->dev, true);
1297                 return;
1298         }
1299
1300         status = acpi_get_gpe_status(device->wakeup.gpe_device,
1301                                         device->wakeup.gpe_number,
1302                                                 &event_status);
1303         if (status == AE_OK)
1304                 device->wakeup.flags.run_wake =
1305                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1306 }
1307
1308 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1309 {
1310         int err;
1311
1312         /* Presence of _PRW indicates wake capable */
1313         if (!acpi_has_method(device->handle, "_PRW"))
1314                 return;
1315
1316         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1317                                                            &device->wakeup);
1318         if (err) {
1319                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1320                 return;
1321         }
1322
1323         device->wakeup.flags.valid = 1;
1324         device->wakeup.prepare_count = 0;
1325         acpi_bus_set_run_wake_flags(device);
1326         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1327          * system for the ACPI device with the _PRW object.
1328          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1329          * So it is necessary to call _DSW object first. Only when it is not
1330          * present will the _PSW object used.
1331          */
1332         err = acpi_device_sleep_wake(device, 0, 0, 0);
1333         if (err)
1334                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1335                                 "error in _DSW or _PSW evaluation\n"));
1336 }
1337
1338 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1339 {
1340         struct acpi_device_power_state *ps = &device->power.states[state];
1341         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1342         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1343         acpi_status status;
1344
1345         INIT_LIST_HEAD(&ps->resources);
1346
1347         /* Evaluate "_PRx" to get referenced power resources */
1348         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1349         if (ACPI_SUCCESS(status)) {
1350                 union acpi_object *package = buffer.pointer;
1351
1352                 if (buffer.length && package
1353                     && package->type == ACPI_TYPE_PACKAGE
1354                     && package->package.count) {
1355                         int err = acpi_extract_power_resources(package, 0,
1356                                                                &ps->resources);
1357                         if (!err)
1358                                 device->power.flags.power_resources = 1;
1359                 }
1360                 ACPI_FREE(buffer.pointer);
1361         }
1362
1363         /* Evaluate "_PSx" to see if we can do explicit sets */
1364         pathname[2] = 'S';
1365         if (acpi_has_method(device->handle, pathname))
1366                 ps->flags.explicit_set = 1;
1367
1368         /*
1369          * State is valid if there are means to put the device into it.
1370          * D3hot is only valid if _PR3 present.
1371          */
1372         if (!list_empty(&ps->resources)
1373             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1374                 ps->flags.valid = 1;
1375                 ps->flags.os_accessible = 1;
1376         }
1377
1378         ps->power = -1;         /* Unknown - driver assigned */
1379         ps->latency = -1;       /* Unknown - driver assigned */
1380 }
1381
1382 static void acpi_bus_get_power_flags(struct acpi_device *device)
1383 {
1384         u32 i;
1385
1386         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1387         if (!acpi_has_method(device->handle, "_PS0") &&
1388             !acpi_has_method(device->handle, "_PR0"))
1389                 return;
1390
1391         device->flags.power_manageable = 1;
1392
1393         /*
1394          * Power Management Flags
1395          */
1396         if (acpi_has_method(device->handle, "_PSC"))
1397                 device->power.flags.explicit_get = 1;
1398         if (acpi_has_method(device->handle, "_IRC"))
1399                 device->power.flags.inrush_current = 1;
1400
1401         /*
1402          * Enumerate supported power management states
1403          */
1404         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1405                 acpi_bus_init_power_state(device, i);
1406
1407         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1408
1409         /* Set defaults for D0 and D3 states (always valid) */
1410         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1411         device->power.states[ACPI_STATE_D0].power = 100;
1412         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1413         device->power.states[ACPI_STATE_D3].power = 0;
1414
1415         /* Set D3cold's explicit_set flag if _PS3 exists. */
1416         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1417                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1418
1419         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1420         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1421                         device->power.flags.power_resources)
1422                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1423
1424         if (acpi_bus_init_power(device)) {
1425                 acpi_free_power_resources_lists(device);
1426                 device->flags.power_manageable = 0;
1427         }
1428 }
1429
1430 static void acpi_bus_get_flags(struct acpi_device *device)
1431 {
1432         /* Presence of _STA indicates 'dynamic_status' */
1433         if (acpi_has_method(device->handle, "_STA"))
1434                 device->flags.dynamic_status = 1;
1435
1436         /* Presence of _RMV indicates 'removable' */
1437         if (acpi_has_method(device->handle, "_RMV"))
1438                 device->flags.removable = 1;
1439
1440         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1441         if (acpi_has_method(device->handle, "_EJD") ||
1442             acpi_has_method(device->handle, "_EJ0"))
1443                 device->flags.ejectable = 1;
1444 }
1445
1446 static void acpi_device_get_busid(struct acpi_device *device)
1447 {
1448         char bus_id[5] = { '?', 0 };
1449         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1450         int i = 0;
1451
1452         /*
1453          * Bus ID
1454          * ------
1455          * The device's Bus ID is simply the object name.
1456          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1457          */
1458         if (ACPI_IS_ROOT_DEVICE(device)) {
1459                 strcpy(device->pnp.bus_id, "ACPI");
1460                 return;
1461         }
1462
1463         switch (device->device_type) {
1464         case ACPI_BUS_TYPE_POWER_BUTTON:
1465                 strcpy(device->pnp.bus_id, "PWRF");
1466                 break;
1467         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1468                 strcpy(device->pnp.bus_id, "SLPF");
1469                 break;
1470         default:
1471                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1472                 /* Clean up trailing underscores (if any) */
1473                 for (i = 3; i > 1; i--) {
1474                         if (bus_id[i] == '_')
1475                                 bus_id[i] = '\0';
1476                         else
1477                                 break;
1478                 }
1479                 strcpy(device->pnp.bus_id, bus_id);
1480                 break;
1481         }
1482 }
1483
1484 /*
1485  * acpi_ata_match - see if an acpi object is an ATA device
1486  *
1487  * If an acpi object has one of the ACPI ATA methods defined,
1488  * then we can safely call it an ATA device.
1489  */
1490 bool acpi_ata_match(acpi_handle handle)
1491 {
1492         return acpi_has_method(handle, "_GTF") ||
1493                acpi_has_method(handle, "_GTM") ||
1494                acpi_has_method(handle, "_STM") ||
1495                acpi_has_method(handle, "_SDD");
1496 }
1497
1498 /*
1499  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1500  *
1501  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1502  * then we can safely call it an ejectable drive bay
1503  */
1504 bool acpi_bay_match(acpi_handle handle)
1505 {
1506         acpi_handle phandle;
1507
1508         if (!acpi_has_method(handle, "_EJ0"))
1509                 return false;
1510         if (acpi_ata_match(handle))
1511                 return true;
1512         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1513                 return false;
1514
1515         return acpi_ata_match(phandle);
1516 }
1517
1518 /*
1519  * acpi_dock_match - see if an acpi object has a _DCK method
1520  */
1521 bool acpi_dock_match(acpi_handle handle)
1522 {
1523         return acpi_has_method(handle, "_DCK");
1524 }
1525
1526 const char *acpi_device_hid(struct acpi_device *device)
1527 {
1528         struct acpi_hardware_id *hid;
1529
1530         if (list_empty(&device->pnp.ids))
1531                 return dummy_hid;
1532
1533         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1534         return hid->id;
1535 }
1536 EXPORT_SYMBOL(acpi_device_hid);
1537
1538 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1539 {
1540         struct acpi_hardware_id *id;
1541
1542         id = kmalloc(sizeof(*id), GFP_KERNEL);
1543         if (!id)
1544                 return;
1545
1546         id->id = kstrdup(dev_id, GFP_KERNEL);
1547         if (!id->id) {
1548                 kfree(id);
1549                 return;
1550         }
1551
1552         list_add_tail(&id->list, &pnp->ids);
1553         pnp->type.hardware_id = 1;
1554 }
1555
1556 /*
1557  * Old IBM workstations have a DSDT bug wherein the SMBus object
1558  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1559  * prefix.  Work around this.
1560  */
1561 static bool acpi_ibm_smbus_match(acpi_handle handle)
1562 {
1563         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1564         struct acpi_buffer path = { sizeof(node_name), node_name };
1565
1566         if (!dmi_name_in_vendors("IBM"))
1567                 return false;
1568
1569         /* Look for SMBS object */
1570         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1571             strcmp("SMBS", path.pointer))
1572                 return false;
1573
1574         /* Does it have the necessary (but misnamed) methods? */
1575         if (acpi_has_method(handle, "SBI") &&
1576             acpi_has_method(handle, "SBR") &&
1577             acpi_has_method(handle, "SBW"))
1578                 return true;
1579
1580         return false;
1581 }
1582
1583 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1584                                 int device_type)
1585 {
1586         acpi_status status;
1587         struct acpi_device_info *info;
1588         struct acpi_pnp_device_id_list *cid_list;
1589         int i;
1590
1591         switch (device_type) {
1592         case ACPI_BUS_TYPE_DEVICE:
1593                 if (handle == ACPI_ROOT_OBJECT) {
1594                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1595                         break;
1596                 }
1597
1598                 status = acpi_get_object_info(handle, &info);
1599                 if (ACPI_FAILURE(status)) {
1600                         pr_err(PREFIX "%s: Error reading device info\n",
1601                                         __func__);
1602                         return;
1603                 }
1604
1605                 if (info->valid & ACPI_VALID_HID)
1606                         acpi_add_id(pnp, info->hardware_id.string);
1607                 if (info->valid & ACPI_VALID_CID) {
1608                         cid_list = &info->compatible_id_list;
1609                         for (i = 0; i < cid_list->count; i++)
1610                                 acpi_add_id(pnp, cid_list->ids[i].string);
1611                 }
1612                 if (info->valid & ACPI_VALID_ADR) {
1613                         pnp->bus_address = info->address;
1614                         pnp->type.bus_address = 1;
1615                 }
1616                 if (info->valid & ACPI_VALID_UID)
1617                         pnp->unique_id = kstrdup(info->unique_id.string,
1618                                                         GFP_KERNEL);
1619
1620                 kfree(info);
1621
1622                 /*
1623                  * Some devices don't reliably have _HIDs & _CIDs, so add
1624                  * synthetic HIDs to make sure drivers can find them.
1625                  */
1626                 if (acpi_is_video_device(handle))
1627                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1628                 else if (acpi_bay_match(handle))
1629                         acpi_add_id(pnp, ACPI_BAY_HID);
1630                 else if (acpi_dock_match(handle))
1631                         acpi_add_id(pnp, ACPI_DOCK_HID);
1632                 else if (acpi_ibm_smbus_match(handle))
1633                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1634                 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1635                         acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1636                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1637                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1638                 }
1639
1640                 break;
1641         case ACPI_BUS_TYPE_POWER:
1642                 acpi_add_id(pnp, ACPI_POWER_HID);
1643                 break;
1644         case ACPI_BUS_TYPE_PROCESSOR:
1645                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1646                 break;
1647         case ACPI_BUS_TYPE_THERMAL:
1648                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1649                 break;
1650         case ACPI_BUS_TYPE_POWER_BUTTON:
1651                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1652                 break;
1653         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1654                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1655                 break;
1656         }
1657 }
1658
1659 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1660 {
1661         struct acpi_hardware_id *id, *tmp;
1662
1663         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1664                 kfree(id->id);
1665                 kfree(id);
1666         }
1667         kfree(pnp->unique_id);
1668 }
1669
1670 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1671                              int type, unsigned long long sta)
1672 {
1673         INIT_LIST_HEAD(&device->pnp.ids);
1674         device->device_type = type;
1675         device->handle = handle;
1676         device->parent = acpi_bus_get_parent(handle);
1677         STRUCT_TO_INT(device->status) = sta;
1678         acpi_device_get_busid(device);
1679         acpi_set_pnp_ids(handle, &device->pnp, type);
1680         acpi_bus_get_flags(device);
1681         device->flags.match_driver = false;
1682         device_initialize(&device->dev);
1683         dev_set_uevent_suppress(&device->dev, true);
1684 }
1685
1686 void acpi_device_add_finalize(struct acpi_device *device)
1687 {
1688         device->flags.match_driver = true;
1689         dev_set_uevent_suppress(&device->dev, false);
1690         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1691 }
1692
1693 static int acpi_add_single_object(struct acpi_device **child,
1694                                   acpi_handle handle, int type,
1695                                   unsigned long long sta)
1696 {
1697         int result;
1698         struct acpi_device *device;
1699         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1700
1701         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1702         if (!device) {
1703                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1704                 return -ENOMEM;
1705         }
1706
1707         acpi_init_device_object(device, handle, type, sta);
1708         acpi_bus_get_power_flags(device);
1709         acpi_bus_get_wakeup_device_flags(device);
1710
1711         result = acpi_device_add(device, acpi_device_release);
1712         if (result) {
1713                 acpi_device_release(&device->dev);
1714                 return result;
1715         }
1716
1717         acpi_power_add_remove_device(device, true);
1718         acpi_device_add_finalize(device);
1719         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1720         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1721                 dev_name(&device->dev), (char *) buffer.pointer,
1722                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1723         kfree(buffer.pointer);
1724         *child = device;
1725         return 0;
1726 }
1727
1728 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1729                                     unsigned long long *sta)
1730 {
1731         acpi_status status;
1732         acpi_object_type acpi_type;
1733
1734         status = acpi_get_type(handle, &acpi_type);
1735         if (ACPI_FAILURE(status))
1736                 return -ENODEV;
1737
1738         switch (acpi_type) {
1739         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1740         case ACPI_TYPE_DEVICE:
1741                 *type = ACPI_BUS_TYPE_DEVICE;
1742                 status = acpi_bus_get_status_handle(handle, sta);
1743                 if (ACPI_FAILURE(status))
1744                         return -ENODEV;
1745                 break;
1746         case ACPI_TYPE_PROCESSOR:
1747                 *type = ACPI_BUS_TYPE_PROCESSOR;
1748                 status = acpi_bus_get_status_handle(handle, sta);
1749                 if (ACPI_FAILURE(status))
1750                         return -ENODEV;
1751                 break;
1752         case ACPI_TYPE_THERMAL:
1753                 *type = ACPI_BUS_TYPE_THERMAL;
1754                 *sta = ACPI_STA_DEFAULT;
1755                 break;
1756         case ACPI_TYPE_POWER:
1757                 *type = ACPI_BUS_TYPE_POWER;
1758                 *sta = ACPI_STA_DEFAULT;
1759                 break;
1760         default:
1761                 return -ENODEV;
1762         }
1763
1764         return 0;
1765 }
1766
1767 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1768                                        char *idstr,
1769                                        const struct acpi_device_id **matchid)
1770 {
1771         const struct acpi_device_id *devid;
1772
1773         for (devid = handler->ids; devid->id[0]; devid++)
1774                 if (!strcmp((char *)devid->id, idstr)) {
1775                         if (matchid)
1776                                 *matchid = devid;
1777
1778                         return true;
1779                 }
1780
1781         return false;
1782 }
1783
1784 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1785                                         const struct acpi_device_id **matchid)
1786 {
1787         struct acpi_scan_handler *handler;
1788
1789         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1790                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1791                         return handler;
1792
1793         return NULL;
1794 }
1795
1796 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1797 {
1798         if (!!hotplug->enabled == !!val)
1799                 return;
1800
1801         mutex_lock(&acpi_scan_lock);
1802
1803         hotplug->enabled = val;
1804
1805         mutex_unlock(&acpi_scan_lock);
1806 }
1807
1808 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1809 {
1810         struct acpi_device_pnp pnp = {};
1811         struct acpi_hardware_id *hwid;
1812         struct acpi_scan_handler *handler;
1813
1814         INIT_LIST_HEAD(&pnp.ids);
1815         acpi_set_pnp_ids(handle, &pnp, type);
1816
1817         if (!pnp.type.hardware_id)
1818                 goto out;
1819
1820         /*
1821          * This relies on the fact that acpi_install_notify_handler() will not
1822          * install the same notify handler routine twice for the same handle.
1823          */
1824         list_for_each_entry(hwid, &pnp.ids, list) {
1825                 handler = acpi_scan_match_handler(hwid->id, NULL);
1826                 if (handler) {
1827                         acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1828                                         acpi_hotplug_notify_cb, handler);
1829                         break;
1830                 }
1831         }
1832
1833 out:
1834         acpi_free_pnp_ids(&pnp);
1835 }
1836
1837 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1838                                       void *not_used, void **return_value)
1839 {
1840         struct acpi_device *device = NULL;
1841         int type;
1842         unsigned long long sta;
1843         int result;
1844
1845         acpi_bus_get_device(handle, &device);
1846         if (device)
1847                 goto out;
1848
1849         result = acpi_bus_type_and_status(handle, &type, &sta);
1850         if (result)
1851                 return AE_OK;
1852
1853         if (type == ACPI_BUS_TYPE_POWER) {
1854                 acpi_add_power_resource(handle);
1855                 return AE_OK;
1856         }
1857
1858         acpi_scan_init_hotplug(handle, type);
1859
1860         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1861             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1862                 struct acpi_device_wakeup wakeup;
1863
1864                 if (acpi_has_method(handle, "_PRW")) {
1865                         acpi_bus_extract_wakeup_device_power_package(handle,
1866                                                                      &wakeup);
1867                         acpi_power_resources_list_free(&wakeup.resources);
1868                 }
1869                 return AE_CTRL_DEPTH;
1870         }
1871
1872         acpi_add_single_object(&device, handle, type, sta);
1873         if (!device)
1874                 return AE_CTRL_DEPTH;
1875
1876  out:
1877         if (!*return_value)
1878                 *return_value = device;
1879
1880         return AE_OK;
1881 }
1882
1883 static int acpi_scan_attach_handler(struct acpi_device *device)
1884 {
1885         struct acpi_hardware_id *hwid;
1886         int ret = 0;
1887
1888         list_for_each_entry(hwid, &device->pnp.ids, list) {
1889                 const struct acpi_device_id *devid;
1890                 struct acpi_scan_handler *handler;
1891
1892                 handler = acpi_scan_match_handler(hwid->id, &devid);
1893                 if (handler) {
1894                         ret = handler->attach(device, devid);
1895                         if (ret > 0) {
1896                                 device->handler = handler;
1897                                 break;
1898                         } else if (ret < 0) {
1899                                 break;
1900                         }
1901                 }
1902         }
1903         return ret;
1904 }
1905
1906 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1907                                           void *not_used, void **ret_not_used)
1908 {
1909         struct acpi_device *device;
1910         unsigned long long sta_not_used;
1911         int ret;
1912
1913         /*
1914          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1915          * namespace walks prematurely.
1916          */
1917         if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1918                 return AE_OK;
1919
1920         if (acpi_bus_get_device(handle, &device))
1921                 return AE_CTRL_DEPTH;
1922
1923         if (device->handler)
1924                 return AE_OK;
1925
1926         ret = acpi_scan_attach_handler(device);
1927         if (ret)
1928                 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1929
1930         ret = device_attach(&device->dev);
1931         return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1932 }
1933
1934 /**
1935  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1936  * @handle: Root of the namespace scope to scan.
1937  *
1938  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1939  * found devices.
1940  *
1941  * If no devices were found, -ENODEV is returned, but it does not mean that
1942  * there has been a real error.  There just have been no suitable ACPI objects
1943  * in the table trunk from which the kernel could create a device and add an
1944  * appropriate driver.
1945  *
1946  * Must be called under acpi_scan_lock.
1947  */
1948 int acpi_bus_scan(acpi_handle handle)
1949 {
1950         void *device = NULL;
1951         int error = 0;
1952
1953         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1954                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1955                                     acpi_bus_check_add, NULL, NULL, &device);
1956
1957         if (!device)
1958                 error = -ENODEV;
1959         else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1960                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1961                                     acpi_bus_device_attach, NULL, NULL, NULL);
1962
1963         return error;
1964 }
1965 EXPORT_SYMBOL(acpi_bus_scan);
1966
1967 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1968                                           void *not_used, void **ret_not_used)
1969 {
1970         struct acpi_device *device = NULL;
1971
1972         if (!acpi_bus_get_device(handle, &device)) {
1973                 struct acpi_scan_handler *dev_handler = device->handler;
1974
1975                 if (dev_handler) {
1976                         if (dev_handler->detach)
1977                                 dev_handler->detach(device);
1978
1979                         device->handler = NULL;
1980                 } else {
1981                         device_release_driver(&device->dev);
1982                 }
1983         }
1984         return AE_OK;
1985 }
1986
1987 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1988                                    void *not_used, void **ret_not_used)
1989 {
1990         struct acpi_device *device = NULL;
1991
1992         if (!acpi_bus_get_device(handle, &device))
1993                 acpi_device_unregister(device);
1994
1995         return AE_OK;
1996 }
1997
1998 /**
1999  * acpi_bus_trim - Remove ACPI device node and all of its descendants
2000  * @start: Root of the ACPI device nodes subtree to remove.
2001  *
2002  * Must be called under acpi_scan_lock.
2003  */
2004 void acpi_bus_trim(struct acpi_device *start)
2005 {
2006         /*
2007          * Execute acpi_bus_device_detach() as a post-order callback to detach
2008          * all ACPI drivers from the device nodes being removed.
2009          */
2010         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2011                             acpi_bus_device_detach, NULL, NULL);
2012         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
2013         /*
2014          * Execute acpi_bus_remove() as a post-order callback to remove device
2015          * nodes in the given namespace scope.
2016          */
2017         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2018                             acpi_bus_remove, NULL, NULL);
2019         acpi_bus_remove(start->handle, 0, NULL, NULL);
2020 }
2021 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2022
2023 static int acpi_bus_scan_fixed(void)
2024 {
2025         int result = 0;
2026
2027         /*
2028          * Enumerate all fixed-feature devices.
2029          */
2030         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2031                 struct acpi_device *device = NULL;
2032
2033                 result = acpi_add_single_object(&device, NULL,
2034                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2035                                                 ACPI_STA_DEFAULT);
2036                 if (result)
2037                         return result;
2038
2039                 result = device_attach(&device->dev);
2040                 if (result < 0)
2041                         return result;
2042
2043                 device_init_wakeup(&device->dev, true);
2044         }
2045
2046         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2047                 struct acpi_device *device = NULL;
2048
2049                 result = acpi_add_single_object(&device, NULL,
2050                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2051                                                 ACPI_STA_DEFAULT);
2052                 if (result)
2053                         return result;
2054
2055                 result = device_attach(&device->dev);
2056         }
2057
2058         return result < 0 ? result : 0;
2059 }
2060
2061 int __init acpi_scan_init(void)
2062 {
2063         int result;
2064
2065         result = bus_register(&acpi_bus_type);
2066         if (result) {
2067                 /* We don't want to quit even if we failed to add suspend/resume */
2068                 printk(KERN_ERR PREFIX "Could not register bus type\n");
2069         }
2070
2071         acpi_pci_root_init();
2072         acpi_pci_link_init();
2073         acpi_processor_init();
2074         acpi_platform_init();
2075         acpi_lpss_init();
2076         acpi_cmos_rtc_init();
2077         acpi_container_init();
2078         acpi_memory_hotplug_init();
2079         acpi_dock_init();
2080
2081         mutex_lock(&acpi_scan_lock);
2082         /*
2083          * Enumerate devices in the ACPI namespace.
2084          */
2085         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2086         if (result)
2087                 goto out;
2088
2089         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2090         if (result)
2091                 goto out;
2092
2093         result = acpi_bus_scan_fixed();
2094         if (result) {
2095                 acpi_device_unregister(acpi_root);
2096                 goto out;
2097         }
2098
2099         acpi_update_all_gpes();
2100
2101         acpi_pci_root_hp_init();
2102
2103  out:
2104         mutex_unlock(&acpi_scan_lock);
2105         return result;
2106 }