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         acpi_handle not_used;
 197         struct acpi_object_list arg_list;
 198         union acpi_object arg;
 199         struct device *errdev;
 200         acpi_status status;
 201         unsigned long long sta;
 202
 203         /* If there is no handle, the device node has been unregistered. */
 204         if (!handle) {
 205                 dev_dbg(&device->dev, "ACPI handle missing\n");
 206                 put_device(&device->dev);
 207                 return -EINVAL;
 208         }
 209
 210         lock_device_hotplug();
 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         errdev = NULL;
 222         acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 223                             NULL, acpi_bus_offline_companions,
 224                             (void *)false, (void **)&errdev);
 225         acpi_bus_offline_companions(handle, 0, (void *)false, (void **)&errdev);
 226         if (errdev) {
 227                 errdev = NULL;
 228                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 229                                     NULL, acpi_bus_offline_companions,
 230                                     (void *)true , (void **)&errdev);
 231                 if (!errdev || acpi_force_hot_remove)
 232                         acpi_bus_offline_companions(handle, 0, (void *)true,
 233                                                     (void **)&errdev);
 234
 235                 if (errdev && !acpi_force_hot_remove) {
 236                         dev_warn(errdev, "Offline failed.\n");
 237                         acpi_bus_online_companions(handle, 0, NULL, NULL);
 238                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 239                                             ACPI_UINT32_MAX,
 240                                             acpi_bus_online_companions, NULL,
 241                                             NULL, NULL);
 242
 243                         unlock_device_hotplug();
 244
 245                         put_device(&device->dev);
 246                         return -EBUSY;
 247                 }
 248         }
 249
 250         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 251                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 252
 253         acpi_bus_trim(device);
 254
 255         unlock_device_hotplug();
 256
 257         /* Device node has been unregistered. */
 258         put_device(&device->dev);
 259         device = NULL;
 260
 261         if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &not_used))) {
 262                 arg_list.count = 1;
 263                 arg_list.pointer = &arg;
 264                 arg.type = ACPI_TYPE_INTEGER;
 265                 arg.integer.value = 0;
 266                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 267         }
 268
 269         arg_list.count = 1;
 270         arg_list.pointer = &arg;
 271         arg.type = ACPI_TYPE_INTEGER;
 272         arg.integer.value = 1;
 273
 274         /*
 275          * TBD: _EJD support.
 276          */
 277         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 278         if (ACPI_FAILURE(status)) {
 279                 if (status == AE_NOT_FOUND) {
 280                         return -ENODEV;
 281                 } else {
 282                         acpi_handle_warn(handle, "Eject failed (0x%x)\n",
 283                                                                 status);
 284                         return -EIO;
 285                 }
 286         }
 287
 288         /*
 289          * Verify if eject was indeed successful.  If not, log an error
 290          * message.  No need to call _OST since _EJ0 call was made OK.
 291          */
 292         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 293         if (ACPI_FAILURE(status)) {
 294                 acpi_handle_warn(handle,
 295                         "Status check after eject failed (0x%x)\n", status);
 296         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 297                 acpi_handle_warn(handle,
 298                         "Eject incomplete - status 0x%llx\n", sta);
 299         }
 300
 301         return 0;
 302 }
 303
 304 static void acpi_bus_device_eject(void *context)
 305 {
 306         acpi_handle handle = context;
 307         struct acpi_device *device = NULL;
 308         struct acpi_scan_handler *handler;
 309         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 310
 311         mutex_lock(&acpi_scan_lock);
 312
 313         acpi_bus_get_device(handle, &device);
 314         if (!device)
 315                 goto err_out;
 316
 317         handler = device->handler;
 318         if (!handler || !handler->hotplug.enabled) {
 319                 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 320                 goto err_out;
 321         }
 322         acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
 323                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 324         if (handler->hotplug.mode == AHM_CONTAINER) {
 325                 device->flags.eject_pending = true;
 326                 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 327         } else {
 328                 int error;
 329
 330                 get_device(&device->dev);
 331                 error = acpi_scan_hot_remove(device);
 332                 if (error)
 333                         goto err_out;
 334         }
 335
 336  out:
 337         mutex_unlock(&acpi_scan_lock);
 338         return;
 339
 340  err_out:
 341         acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
 342                                   NULL);
 343         goto out;
 344 }
 345
 346 static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
 347 {
 348         struct acpi_device *device = NULL;
 349         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 350         int error;
 351
 352         mutex_lock(&acpi_scan_lock);
 353         lock_device_hotplug();
 354
 355         acpi_bus_get_device(handle, &device);
 356         if (device) {
 357                 dev_warn(&device->dev, "Attempt to re-insert\n");
 358                 goto out;
 359         }
 360         acpi_evaluate_hotplug_ost(handle, ost_source,
 361                                   ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
 362         error = acpi_bus_scan(handle);
 363         if (error) {
 364                 acpi_handle_warn(handle, "Namespace scan failure\n");
 365                 goto out;
 366         }
 367         error = acpi_bus_get_device(handle, &device);
 368         if (error) {
 369                 acpi_handle_warn(handle, "Missing device node object\n");
 370                 goto out;
 371         }
 372         ost_code = ACPI_OST_SC_SUCCESS;
 373         if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
 374                 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 375
 376  out:
 377         unlock_device_hotplug();
 378         acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
 379         mutex_unlock(&acpi_scan_lock);
 380 }
 381
 382 static void acpi_scan_bus_check(void *context)
 383 {
 384         acpi_scan_bus_device_check((acpi_handle)context,
 385                                    ACPI_NOTIFY_BUS_CHECK);
 386 }
 387
 388 static void acpi_scan_device_check(void *context)
 389 {
 390         acpi_scan_bus_device_check((acpi_handle)context,
 391                                    ACPI_NOTIFY_DEVICE_CHECK);
 392 }
 393
 394 static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
 395 {
 396         u32 ost_status;
 397
 398         switch (type) {
 399         case ACPI_NOTIFY_BUS_CHECK:
 400                 acpi_handle_debug(handle,
 401                         "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
 402                 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
 403                 break;
 404         case ACPI_NOTIFY_DEVICE_CHECK:
 405                 acpi_handle_debug(handle,
 406                         "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
 407                 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
 408                 break;
 409         case ACPI_NOTIFY_EJECT_REQUEST:
 410                 acpi_handle_debug(handle,
 411                         "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
 412                 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 413                 break;
 414         default:
 415                 /* non-hotplug event; possibly handled by other handler */
 416                 return;
 417         }
 418
 419         acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
 420 }
 421
 422 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
 423 {
 424         acpi_osd_exec_callback callback;
 425         struct acpi_scan_handler *handler = data;
 426         acpi_status status;
 427
 428         if (!handler->hotplug.enabled)
 429                 return acpi_hotplug_unsupported(handle, type);
 430
 431         switch (type) {
 432         case ACPI_NOTIFY_BUS_CHECK:
 433                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 434                 callback = acpi_scan_bus_check;
 435                 break;
 436         case ACPI_NOTIFY_DEVICE_CHECK:
 437                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 438                 callback = acpi_scan_device_check;
 439                 break;
 440         case ACPI_NOTIFY_EJECT_REQUEST:
 441                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 442                 callback = acpi_bus_device_eject;
 443                 break;
 444         default:
 445                 /* non-hotplug event; possibly handled by other handler */
 446                 return;
 447         }
 448         status = acpi_os_hotplug_execute(callback, handle);
 449         if (ACPI_FAILURE(status))
 450                 acpi_evaluate_hotplug_ost(handle, type,
 451                                           ACPI_OST_SC_NON_SPECIFIC_FAILURE,
 452                                           NULL);
 453 }
 454
 455 /**
 456  * acpi_bus_hot_remove_device: hot-remove a device and its children
 457  * @context: struct acpi_eject_event pointer (freed in this func)
 458  *
 459  * Hot-remove a device and its children. This function frees up the
 460  * memory space passed by arg context, so that the caller may call
 461  * this function asynchronously through acpi_os_hotplug_execute().
 462  */
 463 void acpi_bus_hot_remove_device(void *context)
 464 {
 465         struct acpi_eject_event *ej_event = context;
 466         struct acpi_device *device = ej_event->device;
 467         acpi_handle handle = device->handle;
 468         int error;
 469
 470         mutex_lock(&acpi_scan_lock);
 471
 472         error = acpi_scan_hot_remove(device);
 473         if (error && handle)
 474                 acpi_evaluate_hotplug_ost(handle, ej_event->event,
 475                                           ACPI_OST_SC_NON_SPECIFIC_FAILURE,
 476                                           NULL);
 477
 478         mutex_unlock(&acpi_scan_lock);
 479         kfree(context);
 480 }
 481 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 482
 483 static ssize_t real_power_state_show(struct device *dev,
 484                                      struct device_attribute *attr, char *buf)
 485 {
 486         struct acpi_device *adev = to_acpi_device(dev);
 487         int state;
 488         int ret;
 489
 490         ret = acpi_device_get_power(adev, &state);
 491         if (ret)
 492                 return ret;
 493
 494         return sprintf(buf, "%s\n", acpi_power_state_string(state));
 495 }
 496
 497 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 498
 499 static ssize_t power_state_show(struct device *dev,
 500                                 struct device_attribute *attr, char *buf)
 501 {
 502         struct acpi_device *adev = to_acpi_device(dev);
 503
 504         return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 505 }
 506
 507 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 508
 509 static ssize_t
 510 acpi_eject_store(struct device *d, struct device_attribute *attr,
 511                 const char *buf, size_t count)
 512 {
 513         struct acpi_device *acpi_device = to_acpi_device(d);
 514         struct acpi_eject_event *ej_event;
 515         acpi_object_type not_used;
 516         acpi_status status;
 517         u32 ost_source;
 518         int ret;
 519
 520         if (!count || buf[0] != '1')
 521                 return -EINVAL;
 522
 523         if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
 524             && !acpi_device->driver)
 525                 return -ENODEV;
 526
 527         status = acpi_get_type(acpi_device->handle, &not_used);
 528         if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
 529                 return -ENODEV;
 530
 531         mutex_lock(&acpi_scan_lock);
 532
 533         if (acpi_device->flags.eject_pending) {
 534                 /* ACPI eject notification event. */
 535                 ost_source = ACPI_NOTIFY_EJECT_REQUEST;
 536                 acpi_device->flags.eject_pending = 0;
 537         } else {
 538                 /* Eject initiated by user space. */
 539                 ost_source = ACPI_OST_EC_OSPM_EJECT;
 540         }
 541         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 542         if (!ej_event) {
 543                 ret = -ENOMEM;
 544                 goto err_out;
 545         }
 546         acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
 547                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 548         ej_event->device = acpi_device;
 549         ej_event->event = ost_source;
 550         get_device(&acpi_device->dev);
 551         status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
 552         if (ACPI_FAILURE(status)) {
 553                 put_device(&acpi_device->dev);
 554                 kfree(ej_event);
 555                 ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
 556                 goto err_out;
 557         }
 558         ret = count;
 559
 560  out:
 561         mutex_unlock(&acpi_scan_lock);
 562         return ret;
 563
 564  err_out:
 565         acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
 566                                   ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 567         goto out;
 568 }
 569
 570 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 571
 572 static ssize_t
 573 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 574         struct acpi_device *acpi_dev = to_acpi_device(dev);
 575
 576         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 577 }
 578 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 579
 580 static ssize_t acpi_device_uid_show(struct device *dev,
 581                                     struct device_attribute *attr, char *buf)
 582 {
 583         struct acpi_device *acpi_dev = to_acpi_device(dev);
 584
 585         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 586 }
 587 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 588
 589 static ssize_t acpi_device_adr_show(struct device *dev,
 590                                     struct device_attribute *attr, char *buf)
 591 {
 592         struct acpi_device *acpi_dev = to_acpi_device(dev);
 593
 594         return sprintf(buf, "0x%08x\n",
 595                        (unsigned int)(acpi_dev->pnp.bus_address));
 596 }
 597 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 598
 599 static ssize_t
 600 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 601         struct acpi_device *acpi_dev = to_acpi_device(dev);
 602         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 603         int result;
 604
 605         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 606         if (result)
 607                 goto end;
 608
 609         result = sprintf(buf, "%s\n", (char*)path.pointer);
 610         kfree(path.pointer);
 611 end:
 612         return result;
 613 }
 614 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 615
 616 /* sysfs file that shows description text from the ACPI _STR method */
 617 static ssize_t description_show(struct device *dev,
 618                                 struct device_attribute *attr,
 619                                 char *buf) {
 620         struct acpi_device *acpi_dev = to_acpi_device(dev);
 621         int result;
 622
 623         if (acpi_dev->pnp.str_obj == NULL)
 624                 return 0;
 625
 626         /*
 627          * The _STR object contains a Unicode identifier for a device.
 628          * We need to convert to utf-8 so it can be displayed.
 629          */
 630         result = utf16s_to_utf8s(
 631                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 632                 acpi_dev->pnp.str_obj->buffer.length,
 633                 UTF16_LITTLE_ENDIAN, buf,
 634                 PAGE_SIZE);
 635
 636         buf[result++] = '\n';
 637
 638         return result;
 639 }
 640 static DEVICE_ATTR(description, 0444, description_show, NULL);
 641
 642 static ssize_t
 643 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 644                      char *buf) {
 645         struct acpi_device *acpi_dev = to_acpi_device(dev);
 646
 647         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 648 }
 649 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 650
 651 static int acpi_device_setup_files(struct acpi_device *dev)
 652 {
 653         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 654         acpi_status status;
 655         acpi_handle temp;
 656         unsigned long long sun;
 657         int result = 0;
 658
 659         /*
 660          * Devices gotten from FADT don't have a "path" attribute
 661          */
 662         if (dev->handle) {
 663                 result = device_create_file(&dev->dev, &dev_attr_path);
 664                 if (result)
 665                         goto end;
 666         }
 667
 668         if (!list_empty(&dev->pnp.ids)) {
 669                 result = device_create_file(&dev->dev, &dev_attr_hid);
 670                 if (result)
 671                         goto end;
 672
 673                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 674                 if (result)
 675                         goto end;
 676         }
 677
 678         /*
 679          * If device has _STR, 'description' file is created
 680          */
 681         status = acpi_get_handle(dev->handle, "_STR", &temp);
 682         if (ACPI_SUCCESS(status)) {
 683                 status = acpi_evaluate_object(dev->handle, "_STR",
 684                                         NULL, &buffer);
 685                 if (ACPI_FAILURE(status))
 686                         buffer.pointer = NULL;
 687                 dev->pnp.str_obj = buffer.pointer;
 688                 result = device_create_file(&dev->dev, &dev_attr_description);
 689                 if (result)
 690                         goto end;
 691         }
 692
 693         if (dev->pnp.type.bus_address)
 694                 result = device_create_file(&dev->dev, &dev_attr_adr);
 695         if (dev->pnp.unique_id)
 696                 result = device_create_file(&dev->dev, &dev_attr_uid);
 697
 698         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 699         if (ACPI_SUCCESS(status)) {
 700                 dev->pnp.sun = (unsigned long)sun;
 701                 result = device_create_file(&dev->dev, &dev_attr_sun);
 702                 if (result)
 703                         goto end;
 704         } else {
 705                 dev->pnp.sun = (unsigned long)-1;
 706         }
 707
 708         /*
 709          * If device has _EJ0, 'eject' file is created that is used to trigger
 710          * hot-removal function from userland.
 711          */
 712         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 713         if (ACPI_SUCCESS(status)) {
 714                 result = device_create_file(&dev->dev, &dev_attr_eject);
 715                 if (result)
 716                         return result;
 717         }
 718
 719         if (dev->flags.power_manageable) {
 720                 result = device_create_file(&dev->dev, &dev_attr_power_state);
 721                 if (result)
 722                         return result;
 723
 724                 if (dev->power.flags.power_resources)
 725                         result = device_create_file(&dev->dev,
 726                                                     &dev_attr_real_power_state);
 727         }
 728
 729 end:
 730         return result;
 731 }
 732
 733 static void acpi_device_remove_files(struct acpi_device *dev)
 734 {
 735         acpi_status status;
 736         acpi_handle temp;
 737
 738         if (dev->flags.power_manageable) {
 739                 device_remove_file(&dev->dev, &dev_attr_power_state);
 740                 if (dev->power.flags.power_resources)
 741                         device_remove_file(&dev->dev,
 742                                            &dev_attr_real_power_state);
 743         }
 744
 745         /*
 746          * If device has _STR, remove 'description' file
 747          */
 748         status = acpi_get_handle(dev->handle, "_STR", &temp);
 749         if (ACPI_SUCCESS(status)) {
 750                 kfree(dev->pnp.str_obj);
 751                 device_remove_file(&dev->dev, &dev_attr_description);
 752         }
 753         /*
 754          * If device has _EJ0, remove 'eject' file.
 755          */
 756         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 757         if (ACPI_SUCCESS(status))
 758                 device_remove_file(&dev->dev, &dev_attr_eject);
 759
 760         status = acpi_get_handle(dev->handle, "_SUN", &temp);
 761         if (ACPI_SUCCESS(status))
 762                 device_remove_file(&dev->dev, &dev_attr_sun);
 763
 764         if (dev->pnp.unique_id)
 765                 device_remove_file(&dev->dev, &dev_attr_uid);
 766         if (dev->pnp.type.bus_address)
 767                 device_remove_file(&dev->dev, &dev_attr_adr);
 768         device_remove_file(&dev->dev, &dev_attr_modalias);
 769         device_remove_file(&dev->dev, &dev_attr_hid);
 770         if (dev->handle)
 771                 device_remove_file(&dev->dev, &dev_attr_path);
 772 }
 773 /* --------------------------------------------------------------------------
 774                         ACPI Bus operations
 775    -------------------------------------------------------------------------- */
 776
 777 static const struct acpi_device_id *__acpi_match_device(
 778         struct acpi_device *device, const struct acpi_device_id *ids)
 779 {
 780         const struct acpi_device_id *id;
 781         struct acpi_hardware_id *hwid;
 782
 783         /*
 784          * If the device is not present, it is unnecessary to load device
 785          * driver for it.
 786          */
 787         if (!device->status.present)
 788                 return NULL;
 789
 790         for (id = ids; id->id[0]; id++)
 791                 list_for_each_entry(hwid, &device->pnp.ids, list)
 792                         if (!strcmp((char *) id->id, hwid->id))
 793                                 return id;
 794
 795         return NULL;
 796 }
 797
 798 /**
 799  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 800  * @ids: Array of struct acpi_device_id object to match against.
 801  * @dev: The device structure to match.
 802  *
 803  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 804  * object for that handle and use that object to match against a given list of
 805  * device IDs.
 806  *
 807  * Return a pointer to the first matching ID on success or %NULL on failure.
 808  */
 809 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 810                                                const struct device *dev)
 811 {
 812         struct acpi_device *adev;
 813         acpi_handle handle = ACPI_HANDLE(dev);
 814
 815         if (!ids || !handle || acpi_bus_get_device(handle, &adev))
 816                 return NULL;
 817
 818         return __acpi_match_device(adev, ids);
 819 }
 820 EXPORT_SYMBOL_GPL(acpi_match_device);
 821
 822 int acpi_match_device_ids(struct acpi_device *device,
 823                           const struct acpi_device_id *ids)
 824 {
 825         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 826 }
 827 EXPORT_SYMBOL(acpi_match_device_ids);
 828
 829 static void acpi_free_power_resources_lists(struct acpi_device *device)
 830 {
 831         int i;
 832
 833         if (device->wakeup.flags.valid)
 834                 acpi_power_resources_list_free(&device->wakeup.resources);
 835
 836         if (!device->flags.power_manageable)
 837                 return;
 838
 839         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 840                 struct acpi_device_power_state *ps = &device->power.states[i];
 841                 acpi_power_resources_list_free(&ps->resources);
 842         }
 843 }
 844
 845 static void acpi_device_release(struct device *dev)
 846 {
 847         struct acpi_device *acpi_dev = to_acpi_device(dev);
 848
 849         acpi_free_pnp_ids(&acpi_dev->pnp);
 850         acpi_free_power_resources_lists(acpi_dev);
 851         kfree(acpi_dev);
 852 }
 853
 854 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 855 {
 856         struct acpi_device *acpi_dev = to_acpi_device(dev);
 857         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 858
 859         return acpi_dev->flags.match_driver
 860                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 861 }
 862
 863 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 864 {
 865         struct acpi_device *acpi_dev = to_acpi_device(dev);
 866         int len;
 867
 868         if (list_empty(&acpi_dev->pnp.ids))
 869                 return 0;
 870
 871         if (add_uevent_var(env, "MODALIAS="))
 872                 return -ENOMEM;
 873         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 874                               sizeof(env->buf) - env->buflen);
 875         if (len >= (sizeof(env->buf) - env->buflen))
 876                 return -ENOMEM;
 877         env->buflen += len;
 878         return 0;
 879 }
 880
 881 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 882 {
 883         struct acpi_device *device = data;
 884
 885         device->driver->ops.notify(device, event);
 886 }
 887
 888 static acpi_status acpi_device_notify_fixed(void *data)
 889 {
 890         struct acpi_device *device = data;
 891
 892         /* Fixed hardware devices have no handles */
 893         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 894         return AE_OK;
 895 }
 896
 897 static int acpi_device_install_notify_handler(struct acpi_device *device)
 898 {
 899         acpi_status status;
 900
 901         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 902                 status =
 903                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 904                                                      acpi_device_notify_fixed,
 905                                                      device);
 906         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 907                 status =
 908                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 909                                                      acpi_device_notify_fixed,
 910                                                      device);
 911         else
 912                 status = acpi_install_notify_handler(device->handle,
 913                                                      ACPI_DEVICE_NOTIFY,
 914                                                      acpi_device_notify,
 915                                                      device);
 916
 917         if (ACPI_FAILURE(status))
 918                 return -EINVAL;
 919         return 0;
 920 }
 921
 922 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 923 {
 924         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 925                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 926                                                 acpi_device_notify_fixed);
 927         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 928                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 929                                                 acpi_device_notify_fixed);
 930         else
 931                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 932                                            acpi_device_notify);
 933 }
 934
 935 static int acpi_device_probe(struct device *dev)
 936 {
 937         struct acpi_device *acpi_dev = to_acpi_device(dev);
 938         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 939         int ret;
 940
 941         if (acpi_dev->handler)
 942                 return -EINVAL;
 943
 944         if (!acpi_drv->ops.add)
 945                 return -ENOSYS;
 946
 947         ret = acpi_drv->ops.add(acpi_dev);
 948         if (ret)
 949                 return ret;
 950
 951         acpi_dev->driver = acpi_drv;
 952         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 953                           "Driver [%s] successfully bound to device [%s]\n",
 954                           acpi_drv->name, acpi_dev->pnp.bus_id));
 955
 956         if (acpi_drv->ops.notify) {
 957                 ret = acpi_device_install_notify_handler(acpi_dev);
 958                 if (ret) {
 959                         if (acpi_drv->ops.remove)
 960                                 acpi_drv->ops.remove(acpi_dev);
 961
 962                         acpi_dev->driver = NULL;
 963                         acpi_dev->driver_data = NULL;
 964                         return ret;
 965                 }
 966         }
 967
 968         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
 969                           acpi_drv->name, acpi_dev->pnp.bus_id));
 970         get_device(dev);
 971         return 0;
 972 }
 973
 974 static int acpi_device_remove(struct device * dev)
 975 {
 976         struct acpi_device *acpi_dev = to_acpi_device(dev);
 977         struct acpi_driver *acpi_drv = acpi_dev->driver;
 978
 979         if (acpi_drv) {
 980                 if (acpi_drv->ops.notify)
 981                         acpi_device_remove_notify_handler(acpi_dev);
 982                 if (acpi_drv->ops.remove)
 983                         acpi_drv->ops.remove(acpi_dev);
 984         }
 985         acpi_dev->driver = NULL;
 986         acpi_dev->driver_data = NULL;
 987
 988         put_device(dev);
 989         return 0;
 990 }
 991
 992 struct bus_type acpi_bus_type = {
 993         .name           = "acpi",
 994         .match          = acpi_bus_match,
 995         .probe          = acpi_device_probe,
 996         .remove         = acpi_device_remove,
 997         .uevent         = acpi_device_uevent,
 998 };
 999
1000 int acpi_device_add(struct acpi_device *device,
1001                     void (*release)(struct device *))
1002 {
1003         int result;
1004         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1005         int found = 0;
1006
1007         if (device->handle) {
1008                 acpi_status status;
1009
1010                 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
1011                                           device);
1012                 if (ACPI_FAILURE(status)) {
1013                         acpi_handle_err(device->handle,
1014                                         "Unable to attach device data\n");
1015                         return -ENODEV;
1016                 }
1017         }
1018
1019         /*
1020          * Linkage
1021          * -------
1022          * Link this device to its parent and siblings.
1023          */
1024         INIT_LIST_HEAD(&device->children);
1025         INIT_LIST_HEAD(&device->node);
1026         INIT_LIST_HEAD(&device->wakeup_list);
1027         INIT_LIST_HEAD(&device->physical_node_list);
1028         mutex_init(&device->physical_node_lock);
1029         INIT_LIST_HEAD(&device->power_dependent);
1030
1031         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1032         if (!new_bus_id) {
1033                 pr_err(PREFIX "Memory allocation error\n");
1034                 result = -ENOMEM;
1035                 goto err_detach;
1036         }
1037
1038         mutex_lock(&acpi_device_lock);
1039         /*
1040          * Find suitable bus_id and instance number in acpi_bus_id_list
1041          * If failed, create one and link it into acpi_bus_id_list
1042          */
1043         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1044                 if (!strcmp(acpi_device_bus_id->bus_id,
1045                             acpi_device_hid(device))) {
1046                         acpi_device_bus_id->instance_no++;
1047                         found = 1;
1048                         kfree(new_bus_id);
1049                         break;
1050                 }
1051         }
1052         if (!found) {
1053                 acpi_device_bus_id = new_bus_id;
1054                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1055                 acpi_device_bus_id->instance_no = 0;
1056                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1057         }
1058         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1059
1060         if (device->parent)
1061                 list_add_tail(&device->node, &device->parent->children);
1062
1063         if (device->wakeup.flags.valid)
1064                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1065         mutex_unlock(&acpi_device_lock);
1066
1067         if (device->parent)
1068                 device->dev.parent = &device->parent->dev;
1069         device->dev.bus = &acpi_bus_type;
1070         device->dev.release = release;
1071         result = device_add(&device->dev);
1072         if (result) {
1073                 dev_err(&device->dev, "Error registering device\n");
1074                 goto err;
1075         }
1076
1077         result = acpi_device_setup_files(device);
1078         if (result)
1079                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1080                        dev_name(&device->dev));
1081
1082         return 0;
1083
1084  err:
1085         mutex_lock(&acpi_device_lock);
1086         if (device->parent)
1087                 list_del(&device->node);
1088         list_del(&device->wakeup_list);
1089         mutex_unlock(&acpi_device_lock);
1090
1091  err_detach:
1092         acpi_detach_data(device->handle, acpi_bus_data_handler);
1093         return result;
1094 }
1095
1096 static void acpi_device_unregister(struct acpi_device *device)
1097 {
1098         mutex_lock(&acpi_device_lock);
1099         if (device->parent)
1100                 list_del(&device->node);
1101
1102         list_del(&device->wakeup_list);
1103         mutex_unlock(&acpi_device_lock);
1104
1105         acpi_detach_data(device->handle, acpi_bus_data_handler);
1106
1107         acpi_power_add_remove_device(device, false);
1108         acpi_device_remove_files(device);
1109         if (device->remove)
1110                 device->remove(device);
1111
1112         device_del(&device->dev);
1113         /*
1114          * Transition the device to D3cold to drop the reference counts of all
1115          * power resources the device depends on and turn off the ones that have
1116          * no more references.
1117          */
1118         acpi_device_set_power(device, ACPI_STATE_D3_COLD);
1119         device->handle = NULL;
1120         put_device(&device->dev);
1121 }
1122
1123 /* --------------------------------------------------------------------------
1124                                  Driver Management
1125    -------------------------------------------------------------------------- */
1126 /**
1127  * acpi_bus_register_driver - register a driver with the ACPI bus
1128  * @driver: driver being registered
1129  *
1130  * Registers a driver with the ACPI bus.  Searches the namespace for all
1131  * devices that match the driver's criteria and binds.  Returns zero for
1132  * success or a negative error status for failure.
1133  */
1134 int acpi_bus_register_driver(struct acpi_driver *driver)
1135 {
1136         int ret;
1137
1138         if (acpi_disabled)
1139                 return -ENODEV;
1140         driver->drv.name = driver->name;
1141         driver->drv.bus = &acpi_bus_type;
1142         driver->drv.owner = driver->owner;
1143
1144         ret = driver_register(&driver->drv);
1145         return ret;
1146 }
1147
1148 EXPORT_SYMBOL(acpi_bus_register_driver);
1149
1150 /**
1151  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1152  * @driver: driver to unregister
1153  *
1154  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
1155  * devices that match the driver's criteria and unbinds.
1156  */
1157 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1158 {
1159         driver_unregister(&driver->drv);
1160 }
1161
1162 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1163
1164 /* --------------------------------------------------------------------------
1165                                  Device Enumeration
1166    -------------------------------------------------------------------------- */
1167 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1168 {
1169         struct acpi_device *device = NULL;
1170         acpi_status status;
1171
1172         /*
1173          * Fixed hardware devices do not appear in the namespace and do not
1174          * have handles, but we fabricate acpi_devices for them, so we have
1175          * to deal with them specially.
1176          */
1177         if (!handle)
1178                 return acpi_root;
1179
1180         do {
1181                 status = acpi_get_parent(handle, &handle);
1182                 if (ACPI_FAILURE(status))
1183                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
1184         } while (acpi_bus_get_device(handle, &device));
1185         return device;
1186 }
1187
1188 acpi_status
1189 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1190 {
1191         acpi_status status;
1192         acpi_handle tmp;
1193         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1194         union acpi_object *obj;
1195
1196         status = acpi_get_handle(handle, "_EJD", &tmp);
1197         if (ACPI_FAILURE(status))
1198                 return status;
1199
1200         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1201         if (ACPI_SUCCESS(status)) {
1202                 obj = buffer.pointer;
1203                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1204                                          ejd);
1205                 kfree(buffer.pointer);
1206         }
1207         return status;
1208 }
1209 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1210
1211 void acpi_bus_data_handler(acpi_handle handle, void *context)
1212 {
1213
1214         /* TBD */
1215
1216         return;
1217 }
1218
1219 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1220                                         struct acpi_device_wakeup *wakeup)
1221 {
1222         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1223         union acpi_object *package = NULL;
1224         union acpi_object *element = NULL;
1225         acpi_status status;
1226         int err = -ENODATA;
1227
1228         if (!wakeup)
1229                 return -EINVAL;
1230
1231         INIT_LIST_HEAD(&wakeup->resources);
1232
1233         /* _PRW */
1234         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1235         if (ACPI_FAILURE(status)) {
1236                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1237                 return err;
1238         }
1239
1240         package = (union acpi_object *)buffer.pointer;
1241
1242         if (!package || package->package.count < 2)
1243                 goto out;
1244
1245         element = &(package->package.elements[0]);
1246         if (!element)
1247                 goto out;
1248
1249         if (element->type == ACPI_TYPE_PACKAGE) {
1250                 if ((element->package.count < 2) ||
1251                     (element->package.elements[0].type !=
1252                      ACPI_TYPE_LOCAL_REFERENCE)
1253                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1254                         goto out;
1255
1256                 wakeup->gpe_device =
1257                     element->package.elements[0].reference.handle;
1258                 wakeup->gpe_number =
1259                     (u32) element->package.elements[1].integer.value;
1260         } else if (element->type == ACPI_TYPE_INTEGER) {
1261                 wakeup->gpe_device = NULL;
1262                 wakeup->gpe_number = element->integer.value;
1263         } else {
1264                 goto out;
1265         }
1266
1267         element = &(package->package.elements[1]);
1268         if (element->type != ACPI_TYPE_INTEGER)
1269                 goto out;
1270
1271         wakeup->sleep_state = element->integer.value;
1272
1273         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1274         if (err)
1275                 goto out;
1276
1277         if (!list_empty(&wakeup->resources)) {
1278                 int sleep_state;
1279
1280                 err = acpi_power_wakeup_list_init(&wakeup->resources,
1281                                                   &sleep_state);
1282                 if (err) {
1283                         acpi_handle_warn(handle, "Retrieving current states "
1284                                          "of wakeup power resources failed\n");
1285                         acpi_power_resources_list_free(&wakeup->resources);
1286                         goto out;
1287                 }
1288                 if (sleep_state < wakeup->sleep_state) {
1289                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
1290                                          "(S%d) by S%d from power resources\n",
1291                                          (int)wakeup->sleep_state, sleep_state);
1292                         wakeup->sleep_state = sleep_state;
1293                 }
1294         }
1295         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1296
1297  out:
1298         kfree(buffer.pointer);
1299         return err;
1300 }
1301
1302 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1303 {
1304         struct acpi_device_id button_device_ids[] = {
1305                 {"PNP0C0C", 0},
1306                 {"PNP0C0D", 0},
1307                 {"PNP0C0E", 0},
1308                 {"", 0},
1309         };
1310         acpi_status status;
1311         acpi_event_status event_status;
1312
1313         device->wakeup.flags.notifier_present = 0;
1314
1315         /* Power button, Lid switch always enable wakeup */
1316         if (!acpi_match_device_ids(device, button_device_ids)) {
1317                 device->wakeup.flags.run_wake = 1;
1318                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1319                         /* Do not use Lid/sleep button for S5 wakeup */
1320                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
1321                                 device->wakeup.sleep_state = ACPI_STATE_S4;
1322                 }
1323                 device_set_wakeup_capable(&device->dev, true);
1324                 return;
1325         }
1326
1327         status = acpi_get_gpe_status(device->wakeup.gpe_device,
1328                                         device->wakeup.gpe_number,
1329                                                 &event_status);
1330         if (status == AE_OK)
1331                 device->wakeup.flags.run_wake =
1332                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1333 }
1334
1335 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1336 {
1337         acpi_handle temp;
1338         acpi_status status = 0;
1339         int err;
1340
1341         /* Presence of _PRW indicates wake capable */
1342         status = acpi_get_handle(device->handle, "_PRW", &temp);
1343         if (ACPI_FAILURE(status))
1344                 return;
1345
1346         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1347                                                            &device->wakeup);
1348         if (err) {
1349                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1350                 return;
1351         }
1352
1353         device->wakeup.flags.valid = 1;
1354         device->wakeup.prepare_count = 0;
1355         acpi_bus_set_run_wake_flags(device);
1356         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1357          * system for the ACPI device with the _PRW object.
1358          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1359          * So it is necessary to call _DSW object first. Only when it is not
1360          * present will the _PSW object used.
1361          */
1362         err = acpi_device_sleep_wake(device, 0, 0, 0);
1363         if (err)
1364                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1365                                 "error in _DSW or _PSW evaluation\n"));
1366 }
1367
1368 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1369 {
1370         struct acpi_device_power_state *ps = &device->power.states[state];
1371         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1372         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1373         acpi_handle handle;
1374         acpi_status status;
1375
1376         INIT_LIST_HEAD(&ps->resources);
1377
1378         /* Evaluate "_PRx" to get referenced power resources */
1379         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1380         if (ACPI_SUCCESS(status)) {
1381                 union acpi_object *package = buffer.pointer;
1382
1383                 if (buffer.length && package
1384                     && package->type == ACPI_TYPE_PACKAGE
1385                     && package->package.count) {
1386                         int err = acpi_extract_power_resources(package, 0,
1387                                                                &ps->resources);
1388                         if (!err)
1389                                 device->power.flags.power_resources = 1;
1390                 }
1391                 ACPI_FREE(buffer.pointer);
1392         }
1393
1394         /* Evaluate "_PSx" to see if we can do explicit sets */
1395         pathname[2] = 'S';
1396         status = acpi_get_handle(device->handle, pathname, &handle);
1397         if (ACPI_SUCCESS(status))
1398                 ps->flags.explicit_set = 1;
1399
1400         /*
1401          * State is valid if there are means to put the device into it.
1402          * D3hot is only valid if _PR3 present.
1403          */
1404         if (!list_empty(&ps->resources)
1405             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1406                 ps->flags.valid = 1;
1407                 ps->flags.os_accessible = 1;
1408         }
1409
1410         ps->power = -1;         /* Unknown - driver assigned */
1411         ps->latency = -1;       /* Unknown - driver assigned */
1412 }
1413
1414 static void acpi_bus_get_power_flags(struct acpi_device *device)
1415 {
1416         acpi_status status;
1417         acpi_handle handle;
1418         u32 i;
1419
1420         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1421         status = acpi_get_handle(device->handle, "_PS0", &handle);
1422         if (ACPI_FAILURE(status)) {
1423                 status = acpi_get_handle(device->handle, "_PR0", &handle);
1424                 if (ACPI_FAILURE(status))
1425                         return;
1426         }
1427
1428         device->flags.power_manageable = 1;
1429
1430         /*
1431          * Power Management Flags
1432          */
1433         status = acpi_get_handle(device->handle, "_PSC", &handle);
1434         if (ACPI_SUCCESS(status))
1435                 device->power.flags.explicit_get = 1;
1436         status = acpi_get_handle(device->handle, "_IRC", &handle);
1437         if (ACPI_SUCCESS(status))
1438                 device->power.flags.inrush_current = 1;
1439
1440         /*
1441          * Enumerate supported power management states
1442          */
1443         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1444                 acpi_bus_init_power_state(device, i);
1445
1446         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1447
1448         /* Set defaults for D0 and D3 states (always valid) */
1449         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1450         device->power.states[ACPI_STATE_D0].power = 100;
1451         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1452         device->power.states[ACPI_STATE_D3].power = 0;
1453
1454         /* Set D3cold's explicit_set flag if _PS3 exists. */
1455         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1456                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1457
1458         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1459         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1460                         device->power.flags.power_resources)
1461                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1462
1463         if (acpi_bus_init_power(device)) {
1464                 acpi_free_power_resources_lists(device);
1465                 device->flags.power_manageable = 0;
1466         }
1467 }
1468
1469 static void acpi_bus_get_flags(struct acpi_device *device)
1470 {
1471         acpi_status status = AE_OK;
1472         acpi_handle temp = NULL;
1473
1474         /* Presence of _STA indicates 'dynamic_status' */
1475         status = acpi_get_handle(device->handle, "_STA", &temp);
1476         if (ACPI_SUCCESS(status))
1477                 device->flags.dynamic_status = 1;
1478
1479         /* Presence of _RMV indicates 'removable' */
1480         status = acpi_get_handle(device->handle, "_RMV", &temp);
1481         if (ACPI_SUCCESS(status))
1482                 device->flags.removable = 1;
1483
1484         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1485         status = acpi_get_handle(device->handle, "_EJD", &temp);
1486         if (ACPI_SUCCESS(status))
1487                 device->flags.ejectable = 1;
1488         else {
1489                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1490                 if (ACPI_SUCCESS(status))
1491                         device->flags.ejectable = 1;
1492         }
1493 }
1494
1495 static void acpi_device_get_busid(struct acpi_device *device)
1496 {
1497         char bus_id[5] = { '?', 0 };
1498         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1499         int i = 0;
1500
1501         /*
1502          * Bus ID
1503          * ------
1504          * The device's Bus ID is simply the object name.
1505          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1506          */
1507         if (ACPI_IS_ROOT_DEVICE(device)) {
1508                 strcpy(device->pnp.bus_id, "ACPI");
1509                 return;
1510         }
1511
1512         switch (device->device_type) {
1513         case ACPI_BUS_TYPE_POWER_BUTTON:
1514                 strcpy(device->pnp.bus_id, "PWRF");
1515                 break;
1516         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1517                 strcpy(device->pnp.bus_id, "SLPF");
1518                 break;
1519         default:
1520                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1521                 /* Clean up trailing underscores (if any) */
1522                 for (i = 3; i > 1; i--) {
1523                         if (bus_id[i] == '_')
1524                                 bus_id[i] = '\0';
1525                         else
1526                                 break;
1527                 }
1528                 strcpy(device->pnp.bus_id, bus_id);
1529                 break;
1530         }
1531 }
1532
1533 /*
1534  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1535  *
1536  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1537  * then we can safely call it an ejectable drive bay
1538  */
1539 static int acpi_bay_match(acpi_handle handle)
1540 {
1541         acpi_status status;
1542         acpi_handle tmp;
1543         acpi_handle phandle;
1544
1545         status = acpi_get_handle(handle, "_EJ0", &tmp);
1546         if (ACPI_FAILURE(status))
1547                 return -ENODEV;
1548
1549         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1550                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1551                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1552                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1553                 return 0;
1554
1555         if (acpi_get_parent(handle, &phandle))
1556                 return -ENODEV;
1557
1558         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1559                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1560                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1561                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1562                 return 0;
1563
1564         return -ENODEV;
1565 }
1566
1567 /*
1568  * acpi_dock_match - see if an acpi object has a _DCK method
1569  */
1570 static int acpi_dock_match(acpi_handle handle)
1571 {
1572         acpi_handle tmp;
1573         return acpi_get_handle(handle, "_DCK", &tmp);
1574 }
1575
1576 const char *acpi_device_hid(struct acpi_device *device)
1577 {
1578         struct acpi_hardware_id *hid;
1579
1580         if (list_empty(&device->pnp.ids))
1581                 return dummy_hid;
1582
1583         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1584         return hid->id;
1585 }
1586 EXPORT_SYMBOL(acpi_device_hid);
1587
1588 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1589 {
1590         struct acpi_hardware_id *id;
1591
1592         id = kmalloc(sizeof(*id), GFP_KERNEL);
1593         if (!id)
1594                 return;
1595
1596         id->id = kstrdup(dev_id, GFP_KERNEL);
1597         if (!id->id) {
1598                 kfree(id);
1599                 return;
1600         }
1601
1602         list_add_tail(&id->list, &pnp->ids);
1603         pnp->type.hardware_id = 1;
1604 }
1605
1606 /*
1607  * Old IBM workstations have a DSDT bug wherein the SMBus object
1608  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1609  * prefix.  Work around this.
1610  */
1611 static int acpi_ibm_smbus_match(acpi_handle handle)
1612 {
1613         acpi_handle h_dummy;
1614         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1615         int result;
1616
1617         if (!dmi_name_in_vendors("IBM"))
1618                 return -ENODEV;
1619
1620         /* Look for SMBS object */
1621         result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
1622         if (result)
1623                 return result;
1624
1625         if (strcmp("SMBS", path.pointer)) {
1626                 result = -ENODEV;
1627                 goto out;
1628         }
1629
1630         /* Does it have the necessary (but misnamed) methods? */
1631         result = -ENODEV;
1632         if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
1633             ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
1634             ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
1635                 result = 0;
1636 out:
1637         kfree(path.pointer);
1638         return result;
1639 }
1640
1641 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1642                                 int device_type)
1643 {
1644         acpi_status status;
1645         struct acpi_device_info *info;
1646         struct acpi_pnp_device_id_list *cid_list;
1647         int i;
1648
1649         switch (device_type) {
1650         case ACPI_BUS_TYPE_DEVICE:
1651                 if (handle == ACPI_ROOT_OBJECT) {
1652                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1653                         break;
1654                 }
1655
1656                 status = acpi_get_object_info(handle, &info);
1657                 if (ACPI_FAILURE(status)) {
1658                         pr_err(PREFIX "%s: Error reading device info\n",
1659                                         __func__);
1660                         return;
1661                 }
1662
1663                 if (info->valid & ACPI_VALID_HID)
1664                         acpi_add_id(pnp, info->hardware_id.string);
1665                 if (info->valid & ACPI_VALID_CID) {
1666                         cid_list = &info->compatible_id_list;
1667                         for (i = 0; i < cid_list->count; i++)
1668                                 acpi_add_id(pnp, cid_list->ids[i].string);
1669                 }
1670                 if (info->valid & ACPI_VALID_ADR) {
1671                         pnp->bus_address = info->address;
1672                         pnp->type.bus_address = 1;
1673                 }
1674                 if (info->valid & ACPI_VALID_UID)
1675                         pnp->unique_id = kstrdup(info->unique_id.string,
1676                                                         GFP_KERNEL);
1677
1678                 kfree(info);
1679
1680                 /*
1681                  * Some devices don't reliably have _HIDs & _CIDs, so add
1682                  * synthetic HIDs to make sure drivers can find them.
1683                  */
1684                 if (acpi_is_video_device(handle))
1685                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1686                 else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1687                         acpi_add_id(pnp, ACPI_BAY_HID);
1688                 else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1689                         acpi_add_id(pnp, ACPI_DOCK_HID);
1690                 else if (!acpi_ibm_smbus_match(handle))
1691                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1692                 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1693                         acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1694                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1695                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1696                 }
1697
1698                 break;
1699         case ACPI_BUS_TYPE_POWER:
1700                 acpi_add_id(pnp, ACPI_POWER_HID);
1701                 break;
1702         case ACPI_BUS_TYPE_PROCESSOR:
1703                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1704                 break;
1705         case ACPI_BUS_TYPE_THERMAL:
1706                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1707                 break;
1708         case ACPI_BUS_TYPE_POWER_BUTTON:
1709                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1710                 break;
1711         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1712                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1713                 break;
1714         }
1715 }
1716
1717 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1718 {
1719         struct acpi_hardware_id *id, *tmp;
1720
1721         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1722                 kfree(id->id);
1723                 kfree(id);
1724         }
1725         kfree(pnp->unique_id);
1726 }
1727
1728 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1729                              int type, unsigned long long sta)
1730 {
1731         INIT_LIST_HEAD(&device->pnp.ids);
1732         device->device_type = type;
1733         device->handle = handle;
1734         device->parent = acpi_bus_get_parent(handle);
1735         STRUCT_TO_INT(device->status) = sta;
1736         acpi_device_get_busid(device);
1737         acpi_set_pnp_ids(handle, &device->pnp, type);
1738         acpi_bus_get_flags(device);
1739         device->flags.match_driver = false;
1740         device_initialize(&device->dev);
1741         dev_set_uevent_suppress(&device->dev, true);
1742 }
1743
1744 void acpi_device_add_finalize(struct acpi_device *device)
1745 {
1746         device->flags.match_driver = true;
1747         dev_set_uevent_suppress(&device->dev, false);
1748         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1749 }
1750
1751 static int acpi_add_single_object(struct acpi_device **child,
1752                                   acpi_handle handle, int type,
1753                                   unsigned long long sta)
1754 {
1755         int result;
1756         struct acpi_device *device;
1757         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1758
1759         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1760         if (!device) {
1761                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1762                 return -ENOMEM;
1763         }
1764
1765         acpi_init_device_object(device, handle, type, sta);
1766         acpi_bus_get_power_flags(device);
1767         acpi_bus_get_wakeup_device_flags(device);
1768
1769         result = acpi_device_add(device, acpi_device_release);
1770         if (result) {
1771                 acpi_device_release(&device->dev);
1772                 return result;
1773         }
1774
1775         acpi_power_add_remove_device(device, true);
1776         acpi_device_add_finalize(device);
1777         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1778         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1779                 dev_name(&device->dev), (char *) buffer.pointer,
1780                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1781         kfree(buffer.pointer);
1782         *child = device;
1783         return 0;
1784 }
1785
1786 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1787                                     unsigned long long *sta)
1788 {
1789         acpi_status status;
1790         acpi_object_type acpi_type;
1791
1792         status = acpi_get_type(handle, &acpi_type);
1793         if (ACPI_FAILURE(status))
1794                 return -ENODEV;
1795
1796         switch (acpi_type) {
1797         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1798         case ACPI_TYPE_DEVICE:
1799                 *type = ACPI_BUS_TYPE_DEVICE;
1800                 status = acpi_bus_get_status_handle(handle, sta);
1801                 if (ACPI_FAILURE(status))
1802                         return -ENODEV;
1803                 break;
1804         case ACPI_TYPE_PROCESSOR:
1805                 *type = ACPI_BUS_TYPE_PROCESSOR;
1806                 status = acpi_bus_get_status_handle(handle, sta);
1807                 if (ACPI_FAILURE(status))
1808                         return -ENODEV;
1809                 break;
1810         case ACPI_TYPE_THERMAL:
1811                 *type = ACPI_BUS_TYPE_THERMAL;
1812                 *sta = ACPI_STA_DEFAULT;
1813                 break;
1814         case ACPI_TYPE_POWER:
1815                 *type = ACPI_BUS_TYPE_POWER;
1816                 *sta = ACPI_STA_DEFAULT;
1817                 break;
1818         default:
1819                 return -ENODEV;
1820         }
1821
1822         return 0;
1823 }
1824
1825 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1826                                        char *idstr,
1827                                        const struct acpi_device_id **matchid)
1828 {
1829         const struct acpi_device_id *devid;
1830
1831         for (devid = handler->ids; devid->id[0]; devid++)
1832                 if (!strcmp((char *)devid->id, idstr)) {
1833                         if (matchid)
1834                                 *matchid = devid;
1835
1836                         return true;
1837                 }
1838
1839         return false;
1840 }
1841
1842 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1843                                         const struct acpi_device_id **matchid)
1844 {
1845         struct acpi_scan_handler *handler;
1846
1847         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1848                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1849                         return handler;
1850
1851         return NULL;
1852 }
1853
1854 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1855 {
1856         if (!!hotplug->enabled == !!val)
1857                 return;
1858
1859         mutex_lock(&acpi_scan_lock);
1860
1861         hotplug->enabled = val;
1862
1863         mutex_unlock(&acpi_scan_lock);
1864 }
1865
1866 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1867 {
1868         struct acpi_device_pnp pnp = {};
1869         struct acpi_hardware_id *hwid;
1870         struct acpi_scan_handler *handler;
1871
1872         INIT_LIST_HEAD(&pnp.ids);
1873         acpi_set_pnp_ids(handle, &pnp, type);
1874
1875         if (!pnp.type.hardware_id)
1876                 goto out;
1877
1878         /*
1879          * This relies on the fact that acpi_install_notify_handler() will not
1880          * install the same notify handler routine twice for the same handle.
1881          */
1882         list_for_each_entry(hwid, &pnp.ids, list) {
1883                 handler = acpi_scan_match_handler(hwid->id, NULL);
1884                 if (handler) {
1885                         acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1886                                         acpi_hotplug_notify_cb, handler);
1887                         break;
1888                 }
1889         }
1890
1891 out:
1892         acpi_free_pnp_ids(&pnp);
1893 }
1894
1895 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1896                                       void *not_used, void **return_value)
1897 {
1898         struct acpi_device *device = NULL;
1899         int type;
1900         unsigned long long sta;
1901         acpi_status status;
1902         int result;
1903
1904         acpi_bus_get_device(handle, &device);
1905         if (device)
1906                 goto out;
1907
1908         result = acpi_bus_type_and_status(handle, &type, &sta);
1909         if (result)
1910                 return AE_OK;
1911
1912         if (type == ACPI_BUS_TYPE_POWER) {
1913                 acpi_add_power_resource(handle);
1914                 return AE_OK;
1915         }
1916
1917         acpi_scan_init_hotplug(handle, type);
1918
1919         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1920             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1921                 struct acpi_device_wakeup wakeup;
1922                 acpi_handle temp;
1923
1924                 status = acpi_get_handle(handle, "_PRW", &temp);
1925                 if (ACPI_SUCCESS(status)) {
1926                         acpi_bus_extract_wakeup_device_power_package(handle,
1927                                                                      &wakeup);
1928                         acpi_power_resources_list_free(&wakeup.resources);
1929                 }
1930                 return AE_CTRL_DEPTH;
1931         }
1932
1933         acpi_add_single_object(&device, handle, type, sta);
1934         if (!device)
1935                 return AE_CTRL_DEPTH;
1936
1937  out:
1938         if (!*return_value)
1939                 *return_value = device;
1940
1941         return AE_OK;
1942 }
1943
1944 static int acpi_scan_attach_handler(struct acpi_device *device)
1945 {
1946         struct acpi_hardware_id *hwid;
1947         int ret = 0;
1948
1949         list_for_each_entry(hwid, &device->pnp.ids, list) {
1950                 const struct acpi_device_id *devid;
1951                 struct acpi_scan_handler *handler;
1952
1953                 handler = acpi_scan_match_handler(hwid->id, &devid);
1954                 if (handler) {
1955                         ret = handler->attach(device, devid);
1956                         if (ret > 0) {
1957                                 device->handler = handler;
1958                                 break;
1959                         } else if (ret < 0) {
1960                                 break;
1961                         }
1962                 }
1963         }
1964         return ret;
1965 }
1966
1967 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1968                                           void *not_used, void **ret_not_used)
1969 {
1970         struct acpi_device *device;
1971         unsigned long long sta_not_used;
1972         int ret;
1973
1974         /*
1975          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1976          * namespace walks prematurely.
1977          */
1978         if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1979                 return AE_OK;
1980
1981         if (acpi_bus_get_device(handle, &device))
1982                 return AE_CTRL_DEPTH;
1983
1984         if (device->handler)
1985                 return AE_OK;
1986
1987         ret = acpi_scan_attach_handler(device);
1988         if (ret)
1989                 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1990
1991         ret = device_attach(&device->dev);
1992         return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1993 }
1994
1995 /**
1996  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1997  * @handle: Root of the namespace scope to scan.
1998  *
1999  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2000  * found devices.
2001  *
2002  * If no devices were found, -ENODEV is returned, but it does not mean that
2003  * there has been a real error.  There just have been no suitable ACPI objects
2004  * in the table trunk from which the kernel could create a device and add an
2005  * appropriate driver.
2006  *
2007  * Must be called under acpi_scan_lock.
2008  */
2009 int acpi_bus_scan(acpi_handle handle)
2010 {
2011         void *device = NULL;
2012         int error = 0;
2013
2014         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2015                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2016                                     acpi_bus_check_add, NULL, NULL, &device);
2017
2018         if (!device)
2019                 error = -ENODEV;
2020         else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
2021                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2022                                     acpi_bus_device_attach, NULL, NULL, NULL);
2023
2024         return error;
2025 }
2026 EXPORT_SYMBOL(acpi_bus_scan);
2027
2028 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
2029                                           void *not_used, void **ret_not_used)
2030 {
2031         struct acpi_device *device = NULL;
2032
2033         if (!acpi_bus_get_device(handle, &device)) {
2034                 struct acpi_scan_handler *dev_handler = device->handler;
2035
2036                 if (dev_handler) {
2037                         if (dev_handler->detach)
2038                                 dev_handler->detach(device);
2039
2040                         device->handler = NULL;
2041                 } else {
2042                         device_release_driver(&device->dev);
2043                 }
2044         }
2045         return AE_OK;
2046 }
2047
2048 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
2049                                    void *not_used, void **ret_not_used)
2050 {
2051         struct acpi_device *device = NULL;
2052
2053         if (!acpi_bus_get_device(handle, &device))
2054                 acpi_device_unregister(device);
2055
2056         return AE_OK;
2057 }
2058
2059 /**
2060  * acpi_bus_trim - Remove ACPI device node and all of its descendants
2061  * @start: Root of the ACPI device nodes subtree to remove.
2062  *
2063  * Must be called under acpi_scan_lock.
2064  */
2065 void acpi_bus_trim(struct acpi_device *start)
2066 {
2067         /*
2068          * Execute acpi_bus_device_detach() as a post-order callback to detach
2069          * all ACPI drivers from the device nodes being removed.
2070          */
2071         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2072                             acpi_bus_device_detach, NULL, NULL);
2073         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
2074         /*
2075          * Execute acpi_bus_remove() as a post-order callback to remove device
2076          * nodes in the given namespace scope.
2077          */
2078         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2079                             acpi_bus_remove, NULL, NULL);
2080         acpi_bus_remove(start->handle, 0, NULL, NULL);
2081 }
2082 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2083
2084 static int acpi_bus_scan_fixed(void)
2085 {
2086         int result = 0;
2087
2088         /*
2089          * Enumerate all fixed-feature devices.
2090          */
2091         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2092                 struct acpi_device *device = NULL;
2093
2094                 result = acpi_add_single_object(&device, NULL,
2095                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2096                                                 ACPI_STA_DEFAULT);
2097                 if (result)
2098                         return result;
2099
2100                 result = device_attach(&device->dev);
2101                 if (result < 0)
2102                         return result;
2103
2104                 device_init_wakeup(&device->dev, true);
2105         }
2106
2107         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2108                 struct acpi_device *device = NULL;
2109
2110                 result = acpi_add_single_object(&device, NULL,
2111                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2112                                                 ACPI_STA_DEFAULT);
2113                 if (result)
2114                         return result;
2115
2116                 result = device_attach(&device->dev);
2117         }
2118
2119         return result < 0 ? result : 0;
2120 }
2121
2122 int __init acpi_scan_init(void)
2123 {
2124         int result;
2125
2126         result = bus_register(&acpi_bus_type);
2127         if (result) {
2128                 /* We don't want to quit even if we failed to add suspend/resume */
2129                 printk(KERN_ERR PREFIX "Could not register bus type\n");
2130         }
2131
2132         acpi_pci_root_init();
2133         acpi_pci_link_init();
2134         acpi_processor_init();
2135         acpi_platform_init();
2136         acpi_lpss_init();
2137         acpi_cmos_rtc_init();
2138         acpi_container_init();
2139         acpi_memory_hotplug_init();
2140         acpi_dock_init();
2141
2142         mutex_lock(&acpi_scan_lock);
2143         /*
2144          * Enumerate devices in the ACPI namespace.
2145          */
2146         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2147         if (result)
2148                 goto out;
2149
2150         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2151         if (result)
2152                 goto out;
2153
2154         result = acpi_bus_scan_fixed();
2155         if (result) {
2156                 acpi_device_unregister(acpi_root);
2157                 goto out;
2158         }
2159
2160         acpi_update_all_gpes();
2161
2162         acpi_pci_root_hp_init();
2163
2164  out:
2165         mutex_unlock(&acpi_scan_lock);
2166         return result;
2167 }