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         if (ost_source != ACPI_NOTIFY_BUS_CHECK) {
 356                 acpi_bus_get_device(handle, &device);
 357                 if (device) {
 358                         dev_warn(&device->dev, "Attempt to re-insert\n");
 359                         goto out;
 360                 }
 361         }
 362         acpi_evaluate_hotplug_ost(handle, ost_source,
 363                                   ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
 364         error = acpi_bus_scan(handle);
 365         if (error) {
 366                 acpi_handle_warn(handle, "Namespace scan failure\n");
 367                 goto out;
 368         }
 369         error = acpi_bus_get_device(handle, &device);
 370         if (error) {
 371                 acpi_handle_warn(handle, "Missing device node object\n");
 372                 goto out;
 373         }
 374         ost_code = ACPI_OST_SC_SUCCESS;
 375         if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
 376                 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 377
 378  out:
 379         unlock_device_hotplug();
 380         acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
 381         mutex_unlock(&acpi_scan_lock);
 382 }
 383
 384 static void acpi_scan_bus_check(void *context)
 385 {
 386         acpi_scan_bus_device_check((acpi_handle)context,
 387                                    ACPI_NOTIFY_BUS_CHECK);
 388 }
 389
 390 static void acpi_scan_device_check(void *context)
 391 {
 392         acpi_scan_bus_device_check((acpi_handle)context,
 393                                    ACPI_NOTIFY_DEVICE_CHECK);
 394 }
 395
 396 static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
 397 {
 398         u32 ost_status;
 399
 400         switch (type) {
 401         case ACPI_NOTIFY_BUS_CHECK:
 402                 acpi_handle_debug(handle,
 403                         "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
 404                 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
 405                 break;
 406         case ACPI_NOTIFY_DEVICE_CHECK:
 407                 acpi_handle_debug(handle,
 408                         "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
 409                 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
 410                 break;
 411         case ACPI_NOTIFY_EJECT_REQUEST:
 412                 acpi_handle_debug(handle,
 413                         "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
 414                 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 415                 break;
 416         default:
 417                 /* non-hotplug event; possibly handled by other handler */
 418                 return;
 419         }
 420
 421         acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
 422 }
 423
 424 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
 425 {
 426         acpi_osd_exec_callback callback;
 427         struct acpi_scan_handler *handler = data;
 428         acpi_status status;
 429
 430         if (!handler->hotplug.enabled)
 431                 return acpi_hotplug_unsupported(handle, type);
 432
 433         switch (type) {
 434         case ACPI_NOTIFY_BUS_CHECK:
 435                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 436                 callback = acpi_scan_bus_check;
 437                 break;
 438         case ACPI_NOTIFY_DEVICE_CHECK:
 439                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 440                 callback = acpi_scan_device_check;
 441                 break;
 442         case ACPI_NOTIFY_EJECT_REQUEST:
 443                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 444                 callback = acpi_bus_device_eject;
 445                 break;
 446         default:
 447                 /* non-hotplug event; possibly handled by other handler */
 448                 return;
 449         }
 450         status = acpi_os_hotplug_execute(callback, handle);
 451         if (ACPI_FAILURE(status))
 452                 acpi_evaluate_hotplug_ost(handle, type,
 453                                           ACPI_OST_SC_NON_SPECIFIC_FAILURE,
 454                                           NULL);
 455 }
 456
 457 /**
 458  * acpi_bus_hot_remove_device: hot-remove a device and its children
 459  * @context: struct acpi_eject_event pointer (freed in this func)
 460  *
 461  * Hot-remove a device and its children. This function frees up the
 462  * memory space passed by arg context, so that the caller may call
 463  * this function asynchronously through acpi_os_hotplug_execute().
 464  */
 465 void acpi_bus_hot_remove_device(void *context)
 466 {
 467         struct acpi_eject_event *ej_event = context;
 468         struct acpi_device *device = ej_event->device;
 469         acpi_handle handle = device->handle;
 470         int error;
 471
 472         mutex_lock(&acpi_scan_lock);
 473
 474         error = acpi_scan_hot_remove(device);
 475         if (error && handle)
 476                 acpi_evaluate_hotplug_ost(handle, ej_event->event,
 477                                           ACPI_OST_SC_NON_SPECIFIC_FAILURE,
 478                                           NULL);
 479
 480         mutex_unlock(&acpi_scan_lock);
 481         kfree(context);
 482 }
 483 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 484
 485 static ssize_t real_power_state_show(struct device *dev,
 486                                      struct device_attribute *attr, char *buf)
 487 {
 488         struct acpi_device *adev = to_acpi_device(dev);
 489         int state;
 490         int ret;
 491
 492         ret = acpi_device_get_power(adev, &state);
 493         if (ret)
 494                 return ret;
 495
 496         return sprintf(buf, "%s\n", acpi_power_state_string(state));
 497 }
 498
 499 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 500
 501 static ssize_t power_state_show(struct device *dev,
 502                                 struct device_attribute *attr, char *buf)
 503 {
 504         struct acpi_device *adev = to_acpi_device(dev);
 505
 506         return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 507 }
 508
 509 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 510
 511 static ssize_t
 512 acpi_eject_store(struct device *d, struct device_attribute *attr,
 513                 const char *buf, size_t count)
 514 {
 515         struct acpi_device *acpi_device = to_acpi_device(d);
 516         struct acpi_eject_event *ej_event;
 517         acpi_object_type not_used;
 518         acpi_status status;
 519         u32 ost_source;
 520         int ret;
 521
 522         if (!count || buf[0] != '1')
 523                 return -EINVAL;
 524
 525         if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
 526             && !acpi_device->driver)
 527                 return -ENODEV;
 528
 529         status = acpi_get_type(acpi_device->handle, &not_used);
 530         if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
 531                 return -ENODEV;
 532
 533         mutex_lock(&acpi_scan_lock);
 534
 535         if (acpi_device->flags.eject_pending) {
 536                 /* ACPI eject notification event. */
 537                 ost_source = ACPI_NOTIFY_EJECT_REQUEST;
 538                 acpi_device->flags.eject_pending = 0;
 539         } else {
 540                 /* Eject initiated by user space. */
 541                 ost_source = ACPI_OST_EC_OSPM_EJECT;
 542         }
 543         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 544         if (!ej_event) {
 545                 ret = -ENOMEM;
 546                 goto err_out;
 547         }
 548         acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
 549                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 550         ej_event->device = acpi_device;
 551         ej_event->event = ost_source;
 552         get_device(&acpi_device->dev);
 553         status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
 554         if (ACPI_FAILURE(status)) {
 555                 put_device(&acpi_device->dev);
 556                 kfree(ej_event);
 557                 ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
 558                 goto err_out;
 559         }
 560         ret = count;
 561
 562  out:
 563         mutex_unlock(&acpi_scan_lock);
 564         return ret;
 565
 566  err_out:
 567         acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
 568                                   ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 569         goto out;
 570 }
 571
 572 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 573
 574 static ssize_t
 575 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 576         struct acpi_device *acpi_dev = to_acpi_device(dev);
 577
 578         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 579 }
 580 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 581
 582 static ssize_t acpi_device_uid_show(struct device *dev,
 583                                     struct device_attribute *attr, char *buf)
 584 {
 585         struct acpi_device *acpi_dev = to_acpi_device(dev);
 586
 587         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 588 }
 589 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 590
 591 static ssize_t acpi_device_adr_show(struct device *dev,
 592                                     struct device_attribute *attr, char *buf)
 593 {
 594         struct acpi_device *acpi_dev = to_acpi_device(dev);
 595
 596         return sprintf(buf, "0x%08x\n",
 597                        (unsigned int)(acpi_dev->pnp.bus_address));
 598 }
 599 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 600
 601 static ssize_t
 602 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 603         struct acpi_device *acpi_dev = to_acpi_device(dev);
 604         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 605         int result;
 606
 607         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 608         if (result)
 609                 goto end;
 610
 611         result = sprintf(buf, "%s\n", (char*)path.pointer);
 612         kfree(path.pointer);
 613 end:
 614         return result;
 615 }
 616 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 617
 618 /* sysfs file that shows description text from the ACPI _STR method */
 619 static ssize_t description_show(struct device *dev,
 620                                 struct device_attribute *attr,
 621                                 char *buf) {
 622         struct acpi_device *acpi_dev = to_acpi_device(dev);
 623         int result;
 624
 625         if (acpi_dev->pnp.str_obj == NULL)
 626                 return 0;
 627
 628         /*
 629          * The _STR object contains a Unicode identifier for a device.
 630          * We need to convert to utf-8 so it can be displayed.
 631          */
 632         result = utf16s_to_utf8s(
 633                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 634                 acpi_dev->pnp.str_obj->buffer.length,
 635                 UTF16_LITTLE_ENDIAN, buf,
 636                 PAGE_SIZE);
 637
 638         buf[result++] = '\n';
 639
 640         return result;
 641 }
 642 static DEVICE_ATTR(description, 0444, description_show, NULL);
 643
 644 static ssize_t
 645 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 646                      char *buf) {
 647         struct acpi_device *acpi_dev = to_acpi_device(dev);
 648
 649         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 650 }
 651 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 652
 653 static int acpi_device_setup_files(struct acpi_device *dev)
 654 {
 655         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 656         acpi_status status;
 657         acpi_handle temp;
 658         unsigned long long sun;
 659         int result = 0;
 660
 661         /*
 662          * Devices gotten from FADT don't have a "path" attribute
 663          */
 664         if (dev->handle) {
 665                 result = device_create_file(&dev->dev, &dev_attr_path);
 666                 if (result)
 667                         goto end;
 668         }
 669
 670         if (!list_empty(&dev->pnp.ids)) {
 671                 result = device_create_file(&dev->dev, &dev_attr_hid);
 672                 if (result)
 673                         goto end;
 674
 675                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 676                 if (result)
 677                         goto end;
 678         }
 679
 680         /*
 681          * If device has _STR, 'description' file is created
 682          */
 683         status = acpi_get_handle(dev->handle, "_STR", &temp);
 684         if (ACPI_SUCCESS(status)) {
 685                 status = acpi_evaluate_object(dev->handle, "_STR",
 686                                         NULL, &buffer);
 687                 if (ACPI_FAILURE(status))
 688                         buffer.pointer = NULL;
 689                 dev->pnp.str_obj = buffer.pointer;
 690                 result = device_create_file(&dev->dev, &dev_attr_description);
 691                 if (result)
 692                         goto end;
 693         }
 694
 695         if (dev->pnp.type.bus_address)
 696                 result = device_create_file(&dev->dev, &dev_attr_adr);
 697         if (dev->pnp.unique_id)
 698                 result = device_create_file(&dev->dev, &dev_attr_uid);
 699
 700         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 701         if (ACPI_SUCCESS(status)) {
 702                 dev->pnp.sun = (unsigned long)sun;
 703                 result = device_create_file(&dev->dev, &dev_attr_sun);
 704                 if (result)
 705                         goto end;
 706         } else {
 707                 dev->pnp.sun = (unsigned long)-1;
 708         }
 709
 710         /*
 711          * If device has _EJ0, 'eject' file is created that is used to trigger
 712          * hot-removal function from userland.
 713          */
 714         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 715         if (ACPI_SUCCESS(status)) {
 716                 result = device_create_file(&dev->dev, &dev_attr_eject);
 717                 if (result)
 718                         return result;
 719         }
 720
 721         if (dev->flags.power_manageable) {
 722                 result = device_create_file(&dev->dev, &dev_attr_power_state);
 723                 if (result)
 724                         return result;
 725
 726                 if (dev->power.flags.power_resources)
 727                         result = device_create_file(&dev->dev,
 728                                                     &dev_attr_real_power_state);
 729         }
 730
 731 end:
 732         return result;
 733 }
 734
 735 static void acpi_device_remove_files(struct acpi_device *dev)
 736 {
 737         acpi_status status;
 738         acpi_handle temp;
 739
 740         if (dev->flags.power_manageable) {
 741                 device_remove_file(&dev->dev, &dev_attr_power_state);
 742                 if (dev->power.flags.power_resources)
 743                         device_remove_file(&dev->dev,
 744                                            &dev_attr_real_power_state);
 745         }
 746
 747         /*
 748          * If device has _STR, remove 'description' file
 749          */
 750         status = acpi_get_handle(dev->handle, "_STR", &temp);
 751         if (ACPI_SUCCESS(status)) {
 752                 kfree(dev->pnp.str_obj);
 753                 device_remove_file(&dev->dev, &dev_attr_description);
 754         }
 755         /*
 756          * If device has _EJ0, remove 'eject' file.
 757          */
 758         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 759         if (ACPI_SUCCESS(status))
 760                 device_remove_file(&dev->dev, &dev_attr_eject);
 761
 762         status = acpi_get_handle(dev->handle, "_SUN", &temp);
 763         if (ACPI_SUCCESS(status))
 764                 device_remove_file(&dev->dev, &dev_attr_sun);
 765
 766         if (dev->pnp.unique_id)
 767                 device_remove_file(&dev->dev, &dev_attr_uid);
 768         if (dev->pnp.type.bus_address)
 769                 device_remove_file(&dev->dev, &dev_attr_adr);
 770         device_remove_file(&dev->dev, &dev_attr_modalias);
 771         device_remove_file(&dev->dev, &dev_attr_hid);
 772         if (dev->handle)
 773                 device_remove_file(&dev->dev, &dev_attr_path);
 774 }
 775 /* --------------------------------------------------------------------------
 776                         ACPI Bus operations
 777    -------------------------------------------------------------------------- */
 778
 779 static const struct acpi_device_id *__acpi_match_device(
 780         struct acpi_device *device, const struct acpi_device_id *ids)
 781 {
 782         const struct acpi_device_id *id;
 783         struct acpi_hardware_id *hwid;
 784
 785         /*
 786          * If the device is not present, it is unnecessary to load device
 787          * driver for it.
 788          */
 789         if (!device->status.present)
 790                 return NULL;
 791
 792         for (id = ids; id->id[0]; id++)
 793                 list_for_each_entry(hwid, &device->pnp.ids, list)
 794                         if (!strcmp((char *) id->id, hwid->id))
 795                                 return id;
 796
 797         return NULL;
 798 }
 799
 800 /**
 801  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 802  * @ids: Array of struct acpi_device_id object to match against.
 803  * @dev: The device structure to match.
 804  *
 805  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 806  * object for that handle and use that object to match against a given list of
 807  * device IDs.
 808  *
 809  * Return a pointer to the first matching ID on success or %NULL on failure.
 810  */
 811 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 812                                                const struct device *dev)
 813 {
 814         struct acpi_device *adev;
 815         acpi_handle handle = ACPI_HANDLE(dev);
 816
 817         if (!ids || !handle || acpi_bus_get_device(handle, &adev))
 818                 return NULL;
 819
 820         return __acpi_match_device(adev, ids);
 821 }
 822 EXPORT_SYMBOL_GPL(acpi_match_device);
 823
 824 int acpi_match_device_ids(struct acpi_device *device,
 825                           const struct acpi_device_id *ids)
 826 {
 827         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 828 }
 829 EXPORT_SYMBOL(acpi_match_device_ids);
 830
 831 static void acpi_free_power_resources_lists(struct acpi_device *device)
 832 {
 833         int i;
 834
 835         if (device->wakeup.flags.valid)
 836                 acpi_power_resources_list_free(&device->wakeup.resources);
 837
 838         if (!device->flags.power_manageable)
 839                 return;
 840
 841         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 842                 struct acpi_device_power_state *ps = &device->power.states[i];
 843                 acpi_power_resources_list_free(&ps->resources);
 844         }
 845 }
 846
 847 static void acpi_device_release(struct device *dev)
 848 {
 849         struct acpi_device *acpi_dev = to_acpi_device(dev);
 850
 851         acpi_free_pnp_ids(&acpi_dev->pnp);
 852         acpi_free_power_resources_lists(acpi_dev);
 853         kfree(acpi_dev);
 854 }
 855
 856 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 857 {
 858         struct acpi_device *acpi_dev = to_acpi_device(dev);
 859         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 860
 861         return acpi_dev->flags.match_driver
 862                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 863 }
 864
 865 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 866 {
 867         struct acpi_device *acpi_dev = to_acpi_device(dev);
 868         int len;
 869
 870         if (list_empty(&acpi_dev->pnp.ids))
 871                 return 0;
 872
 873         if (add_uevent_var(env, "MODALIAS="))
 874                 return -ENOMEM;
 875         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 876                               sizeof(env->buf) - env->buflen);
 877         if (len >= (sizeof(env->buf) - env->buflen))
 878                 return -ENOMEM;
 879         env->buflen += len;
 880         return 0;
 881 }
 882
 883 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 884 {
 885         struct acpi_device *device = data;
 886
 887         device->driver->ops.notify(device, event);
 888 }
 889
 890 static acpi_status acpi_device_notify_fixed(void *data)
 891 {
 892         struct acpi_device *device = data;
 893
 894         /* Fixed hardware devices have no handles */
 895         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 896         return AE_OK;
 897 }
 898
 899 static int acpi_device_install_notify_handler(struct acpi_device *device)
 900 {
 901         acpi_status status;
 902
 903         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 904                 status =
 905                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 906                                                      acpi_device_notify_fixed,
 907                                                      device);
 908         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 909                 status =
 910                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 911                                                      acpi_device_notify_fixed,
 912                                                      device);
 913         else
 914                 status = acpi_install_notify_handler(device->handle,
 915                                                      ACPI_DEVICE_NOTIFY,
 916                                                      acpi_device_notify,
 917                                                      device);
 918
 919         if (ACPI_FAILURE(status))
 920                 return -EINVAL;
 921         return 0;
 922 }
 923
 924 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 925 {
 926         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 927                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 928                                                 acpi_device_notify_fixed);
 929         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 930                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 931                                                 acpi_device_notify_fixed);
 932         else
 933                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 934                                            acpi_device_notify);
 935 }
 936
 937 static int acpi_device_probe(struct device *dev)
 938 {
 939         struct acpi_device *acpi_dev = to_acpi_device(dev);
 940         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 941         int ret;
 942
 943         if (acpi_dev->handler)
 944                 return -EINVAL;
 945
 946         if (!acpi_drv->ops.add)
 947                 return -ENOSYS;
 948
 949         ret = acpi_drv->ops.add(acpi_dev);
 950         if (ret)
 951                 return ret;
 952
 953         acpi_dev->driver = acpi_drv;
 954         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 955                           "Driver [%s] successfully bound to device [%s]\n",
 956                           acpi_drv->name, acpi_dev->pnp.bus_id));
 957
 958         if (acpi_drv->ops.notify) {
 959                 ret = acpi_device_install_notify_handler(acpi_dev);
 960                 if (ret) {
 961                         if (acpi_drv->ops.remove)
 962                                 acpi_drv->ops.remove(acpi_dev);
 963
 964                         acpi_dev->driver = NULL;
 965                         acpi_dev->driver_data = NULL;
 966                         return ret;
 967                 }
 968         }
 969
 970         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
 971                           acpi_drv->name, acpi_dev->pnp.bus_id));
 972         get_device(dev);
 973         return 0;
 974 }
 975
 976 static int acpi_device_remove(struct device * dev)
 977 {
 978         struct acpi_device *acpi_dev = to_acpi_device(dev);
 979         struct acpi_driver *acpi_drv = acpi_dev->driver;
 980
 981         if (acpi_drv) {
 982                 if (acpi_drv->ops.notify)
 983                         acpi_device_remove_notify_handler(acpi_dev);
 984                 if (acpi_drv->ops.remove)
 985                         acpi_drv->ops.remove(acpi_dev);
 986         }
 987         acpi_dev->driver = NULL;
 988         acpi_dev->driver_data = NULL;
 989
 990         put_device(dev);
 991         return 0;
 992 }
 993
 994 struct bus_type acpi_bus_type = {
 995         .name           = "acpi",
 996         .match          = acpi_bus_match,
 997         .probe          = acpi_device_probe,
 998         .remove         = acpi_device_remove,
 999         .uevent         = acpi_device_uevent,
1000 };
1001
1002 int acpi_device_add(struct acpi_device *device,
1003                     void (*release)(struct device *))
1004 {
1005         int result;
1006         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1007         int found = 0;
1008
1009         if (device->handle) {
1010                 acpi_status status;
1011
1012                 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
1013                                           device);
1014                 if (ACPI_FAILURE(status)) {
1015                         acpi_handle_err(device->handle,
1016                                         "Unable to attach device data\n");
1017                         return -ENODEV;
1018                 }
1019         }
1020
1021         /*
1022          * Linkage
1023          * -------
1024          * Link this device to its parent and siblings.
1025          */
1026         INIT_LIST_HEAD(&device->children);
1027         INIT_LIST_HEAD(&device->node);
1028         INIT_LIST_HEAD(&device->wakeup_list);
1029         INIT_LIST_HEAD(&device->physical_node_list);
1030         mutex_init(&device->physical_node_lock);
1031         INIT_LIST_HEAD(&device->power_dependent);
1032
1033         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1034         if (!new_bus_id) {
1035                 pr_err(PREFIX "Memory allocation error\n");
1036                 result = -ENOMEM;
1037                 goto err_detach;
1038         }
1039
1040         mutex_lock(&acpi_device_lock);
1041         /*
1042          * Find suitable bus_id and instance number in acpi_bus_id_list
1043          * If failed, create one and link it into acpi_bus_id_list
1044          */
1045         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1046                 if (!strcmp(acpi_device_bus_id->bus_id,
1047                             acpi_device_hid(device))) {
1048                         acpi_device_bus_id->instance_no++;
1049                         found = 1;
1050                         kfree(new_bus_id);
1051                         break;
1052                 }
1053         }
1054         if (!found) {
1055                 acpi_device_bus_id = new_bus_id;
1056                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1057                 acpi_device_bus_id->instance_no = 0;
1058                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1059         }
1060         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1061
1062         if (device->parent)
1063                 list_add_tail(&device->node, &device->parent->children);
1064
1065         if (device->wakeup.flags.valid)
1066                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1067         mutex_unlock(&acpi_device_lock);
1068
1069         if (device->parent)
1070                 device->dev.parent = &device->parent->dev;
1071         device->dev.bus = &acpi_bus_type;
1072         device->dev.release = release;
1073         result = device_add(&device->dev);
1074         if (result) {
1075                 dev_err(&device->dev, "Error registering device\n");
1076                 goto err;
1077         }
1078
1079         result = acpi_device_setup_files(device);
1080         if (result)
1081                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1082                        dev_name(&device->dev));
1083
1084         return 0;
1085
1086  err:
1087         mutex_lock(&acpi_device_lock);
1088         if (device->parent)
1089                 list_del(&device->node);
1090         list_del(&device->wakeup_list);
1091         mutex_unlock(&acpi_device_lock);
1092
1093  err_detach:
1094         acpi_detach_data(device->handle, acpi_bus_data_handler);
1095         return result;
1096 }
1097
1098 static void acpi_device_unregister(struct acpi_device *device)
1099 {
1100         mutex_lock(&acpi_device_lock);
1101         if (device->parent)
1102                 list_del(&device->node);
1103
1104         list_del(&device->wakeup_list);
1105         mutex_unlock(&acpi_device_lock);
1106
1107         acpi_detach_data(device->handle, acpi_bus_data_handler);
1108
1109         acpi_power_add_remove_device(device, false);
1110         acpi_device_remove_files(device);
1111         if (device->remove)
1112                 device->remove(device);
1113
1114         device_del(&device->dev);
1115         /*
1116          * Transition the device to D3cold to drop the reference counts of all
1117          * power resources the device depends on and turn off the ones that have
1118          * no more references.
1119          */
1120         acpi_device_set_power(device, ACPI_STATE_D3_COLD);
1121         device->handle = NULL;
1122         put_device(&device->dev);
1123 }
1124
1125 /* --------------------------------------------------------------------------
1126                                  Driver Management
1127    -------------------------------------------------------------------------- */
1128 /**
1129  * acpi_bus_register_driver - register a driver with the ACPI bus
1130  * @driver: driver being registered
1131  *
1132  * Registers a driver with the ACPI bus.  Searches the namespace for all
1133  * devices that match the driver's criteria and binds.  Returns zero for
1134  * success or a negative error status for failure.
1135  */
1136 int acpi_bus_register_driver(struct acpi_driver *driver)
1137 {
1138         int ret;
1139
1140         if (acpi_disabled)
1141                 return -ENODEV;
1142         driver->drv.name = driver->name;
1143         driver->drv.bus = &acpi_bus_type;
1144         driver->drv.owner = driver->owner;
1145
1146         ret = driver_register(&driver->drv);
1147         return ret;
1148 }
1149
1150 EXPORT_SYMBOL(acpi_bus_register_driver);
1151
1152 /**
1153  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1154  * @driver: driver to unregister
1155  *
1156  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
1157  * devices that match the driver's criteria and unbinds.
1158  */
1159 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1160 {
1161         driver_unregister(&driver->drv);
1162 }
1163
1164 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1165
1166 /* --------------------------------------------------------------------------
1167                                  Device Enumeration
1168    -------------------------------------------------------------------------- */
1169 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1170 {
1171         struct acpi_device *device = NULL;
1172         acpi_status status;
1173
1174         /*
1175          * Fixed hardware devices do not appear in the namespace and do not
1176          * have handles, but we fabricate acpi_devices for them, so we have
1177          * to deal with them specially.
1178          */
1179         if (!handle)
1180                 return acpi_root;
1181
1182         do {
1183                 status = acpi_get_parent(handle, &handle);
1184                 if (ACPI_FAILURE(status))
1185                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
1186         } while (acpi_bus_get_device(handle, &device));
1187         return device;
1188 }
1189
1190 acpi_status
1191 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1192 {
1193         acpi_status status;
1194         acpi_handle tmp;
1195         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1196         union acpi_object *obj;
1197
1198         status = acpi_get_handle(handle, "_EJD", &tmp);
1199         if (ACPI_FAILURE(status))
1200                 return status;
1201
1202         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1203         if (ACPI_SUCCESS(status)) {
1204                 obj = buffer.pointer;
1205                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1206                                          ejd);
1207                 kfree(buffer.pointer);
1208         }
1209         return status;
1210 }
1211 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1212
1213 void acpi_bus_data_handler(acpi_handle handle, void *context)
1214 {
1215
1216         /* TBD */
1217
1218         return;
1219 }
1220
1221 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1222                                         struct acpi_device_wakeup *wakeup)
1223 {
1224         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1225         union acpi_object *package = NULL;
1226         union acpi_object *element = NULL;
1227         acpi_status status;
1228         int err = -ENODATA;
1229
1230         if (!wakeup)
1231                 return -EINVAL;
1232
1233         INIT_LIST_HEAD(&wakeup->resources);
1234
1235         /* _PRW */
1236         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1237         if (ACPI_FAILURE(status)) {
1238                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1239                 return err;
1240         }
1241
1242         package = (union acpi_object *)buffer.pointer;
1243
1244         if (!package || package->package.count < 2)
1245                 goto out;
1246
1247         element = &(package->package.elements[0]);
1248         if (!element)
1249                 goto out;
1250
1251         if (element->type == ACPI_TYPE_PACKAGE) {
1252                 if ((element->package.count < 2) ||
1253                     (element->package.elements[0].type !=
1254                      ACPI_TYPE_LOCAL_REFERENCE)
1255                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1256                         goto out;
1257
1258                 wakeup->gpe_device =
1259                     element->package.elements[0].reference.handle;
1260                 wakeup->gpe_number =
1261                     (u32) element->package.elements[1].integer.value;
1262         } else if (element->type == ACPI_TYPE_INTEGER) {
1263                 wakeup->gpe_device = NULL;
1264                 wakeup->gpe_number = element->integer.value;
1265         } else {
1266                 goto out;
1267         }
1268
1269         element = &(package->package.elements[1]);
1270         if (element->type != ACPI_TYPE_INTEGER)
1271                 goto out;
1272
1273         wakeup->sleep_state = element->integer.value;
1274
1275         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1276         if (err)
1277                 goto out;
1278
1279         if (!list_empty(&wakeup->resources)) {
1280                 int sleep_state;
1281
1282                 err = acpi_power_wakeup_list_init(&wakeup->resources,
1283                                                   &sleep_state);
1284                 if (err) {
1285                         acpi_handle_warn(handle, "Retrieving current states "
1286                                          "of wakeup power resources failed\n");
1287                         acpi_power_resources_list_free(&wakeup->resources);
1288                         goto out;
1289                 }
1290                 if (sleep_state < wakeup->sleep_state) {
1291                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
1292                                          "(S%d) by S%d from power resources\n",
1293                                          (int)wakeup->sleep_state, sleep_state);
1294                         wakeup->sleep_state = sleep_state;
1295                 }
1296         }
1297         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1298
1299  out:
1300         kfree(buffer.pointer);
1301         return err;
1302 }
1303
1304 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1305 {
1306         struct acpi_device_id button_device_ids[] = {
1307                 {"PNP0C0C", 0},
1308                 {"PNP0C0D", 0},
1309                 {"PNP0C0E", 0},
1310                 {"", 0},
1311         };
1312         acpi_status status;
1313         acpi_event_status event_status;
1314
1315         device->wakeup.flags.notifier_present = 0;
1316
1317         /* Power button, Lid switch always enable wakeup */
1318         if (!acpi_match_device_ids(device, button_device_ids)) {
1319                 device->wakeup.flags.run_wake = 1;
1320                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1321                         /* Do not use Lid/sleep button for S5 wakeup */
1322                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
1323                                 device->wakeup.sleep_state = ACPI_STATE_S4;
1324                 }
1325                 device_set_wakeup_capable(&device->dev, true);
1326                 return;
1327         }
1328
1329         status = acpi_get_gpe_status(device->wakeup.gpe_device,
1330                                         device->wakeup.gpe_number,
1331                                                 &event_status);
1332         if (status == AE_OK)
1333                 device->wakeup.flags.run_wake =
1334                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1335 }
1336
1337 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1338 {
1339         acpi_handle temp;
1340         acpi_status status = 0;
1341         int err;
1342
1343         /* Presence of _PRW indicates wake capable */
1344         status = acpi_get_handle(device->handle, "_PRW", &temp);
1345         if (ACPI_FAILURE(status))
1346                 return;
1347
1348         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1349                                                            &device->wakeup);
1350         if (err) {
1351                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1352                 return;
1353         }
1354
1355         device->wakeup.flags.valid = 1;
1356         device->wakeup.prepare_count = 0;
1357         acpi_bus_set_run_wake_flags(device);
1358         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1359          * system for the ACPI device with the _PRW object.
1360          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1361          * So it is necessary to call _DSW object first. Only when it is not
1362          * present will the _PSW object used.
1363          */
1364         err = acpi_device_sleep_wake(device, 0, 0, 0);
1365         if (err)
1366                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1367                                 "error in _DSW or _PSW evaluation\n"));
1368 }
1369
1370 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1371 {
1372         struct acpi_device_power_state *ps = &device->power.states[state];
1373         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1374         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1375         acpi_handle handle;
1376         acpi_status status;
1377
1378         INIT_LIST_HEAD(&ps->resources);
1379
1380         /* Evaluate "_PRx" to get referenced power resources */
1381         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1382         if (ACPI_SUCCESS(status)) {
1383                 union acpi_object *package = buffer.pointer;
1384
1385                 if (buffer.length && package
1386                     && package->type == ACPI_TYPE_PACKAGE
1387                     && package->package.count) {
1388                         int err = acpi_extract_power_resources(package, 0,
1389                                                                &ps->resources);
1390                         if (!err)
1391                                 device->power.flags.power_resources = 1;
1392                 }
1393                 ACPI_FREE(buffer.pointer);
1394         }
1395
1396         /* Evaluate "_PSx" to see if we can do explicit sets */
1397         pathname[2] = 'S';
1398         status = acpi_get_handle(device->handle, pathname, &handle);
1399         if (ACPI_SUCCESS(status))
1400                 ps->flags.explicit_set = 1;
1401
1402         /*
1403          * State is valid if there are means to put the device into it.
1404          * D3hot is only valid if _PR3 present.
1405          */
1406         if (!list_empty(&ps->resources)
1407             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1408                 ps->flags.valid = 1;
1409                 ps->flags.os_accessible = 1;
1410         }
1411
1412         ps->power = -1;         /* Unknown - driver assigned */
1413         ps->latency = -1;       /* Unknown - driver assigned */
1414 }
1415
1416 static void acpi_bus_get_power_flags(struct acpi_device *device)
1417 {
1418         acpi_status status;
1419         acpi_handle handle;
1420         u32 i;
1421
1422         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1423         status = acpi_get_handle(device->handle, "_PS0", &handle);
1424         if (ACPI_FAILURE(status)) {
1425                 status = acpi_get_handle(device->handle, "_PR0", &handle);
1426                 if (ACPI_FAILURE(status))
1427                         return;
1428         }
1429
1430         device->flags.power_manageable = 1;
1431
1432         /*
1433          * Power Management Flags
1434          */
1435         status = acpi_get_handle(device->handle, "_PSC", &handle);
1436         if (ACPI_SUCCESS(status))
1437                 device->power.flags.explicit_get = 1;
1438         status = acpi_get_handle(device->handle, "_IRC", &handle);
1439         if (ACPI_SUCCESS(status))
1440                 device->power.flags.inrush_current = 1;
1441
1442         /*
1443          * Enumerate supported power management states
1444          */
1445         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1446                 acpi_bus_init_power_state(device, i);
1447
1448         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1449
1450         /* Set defaults for D0 and D3 states (always valid) */
1451         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1452         device->power.states[ACPI_STATE_D0].power = 100;
1453         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1454         device->power.states[ACPI_STATE_D3].power = 0;
1455
1456         /* Set D3cold's explicit_set flag if _PS3 exists. */
1457         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1458                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1459
1460         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1461         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1462                         device->power.flags.power_resources)
1463                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1464
1465         if (acpi_bus_init_power(device)) {
1466                 acpi_free_power_resources_lists(device);
1467                 device->flags.power_manageable = 0;
1468         }
1469 }
1470
1471 static void acpi_bus_get_flags(struct acpi_device *device)
1472 {
1473         acpi_status status = AE_OK;
1474         acpi_handle temp = NULL;
1475
1476         /* Presence of _STA indicates 'dynamic_status' */
1477         status = acpi_get_handle(device->handle, "_STA", &temp);
1478         if (ACPI_SUCCESS(status))
1479                 device->flags.dynamic_status = 1;
1480
1481         /* Presence of _RMV indicates 'removable' */
1482         status = acpi_get_handle(device->handle, "_RMV", &temp);
1483         if (ACPI_SUCCESS(status))
1484                 device->flags.removable = 1;
1485
1486         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1487         status = acpi_get_handle(device->handle, "_EJD", &temp);
1488         if (ACPI_SUCCESS(status))
1489                 device->flags.ejectable = 1;
1490         else {
1491                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1492                 if (ACPI_SUCCESS(status))
1493                         device->flags.ejectable = 1;
1494         }
1495 }
1496
1497 static void acpi_device_get_busid(struct acpi_device *device)
1498 {
1499         char bus_id[5] = { '?', 0 };
1500         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1501         int i = 0;
1502
1503         /*
1504          * Bus ID
1505          * ------
1506          * The device's Bus ID is simply the object name.
1507          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1508          */
1509         if (ACPI_IS_ROOT_DEVICE(device)) {
1510                 strcpy(device->pnp.bus_id, "ACPI");
1511                 return;
1512         }
1513
1514         switch (device->device_type) {
1515         case ACPI_BUS_TYPE_POWER_BUTTON:
1516                 strcpy(device->pnp.bus_id, "PWRF");
1517                 break;
1518         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1519                 strcpy(device->pnp.bus_id, "SLPF");
1520                 break;
1521         default:
1522                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1523                 /* Clean up trailing underscores (if any) */
1524                 for (i = 3; i > 1; i--) {
1525                         if (bus_id[i] == '_')
1526                                 bus_id[i] = '\0';
1527                         else
1528                                 break;
1529                 }
1530                 strcpy(device->pnp.bus_id, bus_id);
1531                 break;
1532         }
1533 }
1534
1535 /*
1536  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1537  *
1538  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1539  * then we can safely call it an ejectable drive bay
1540  */
1541 static int acpi_bay_match(acpi_handle handle)
1542 {
1543         acpi_status status;
1544         acpi_handle tmp;
1545         acpi_handle phandle;
1546
1547         status = acpi_get_handle(handle, "_EJ0", &tmp);
1548         if (ACPI_FAILURE(status))
1549                 return -ENODEV;
1550
1551         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1552                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1553                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1554                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1555                 return 0;
1556
1557         if (acpi_get_parent(handle, &phandle))
1558                 return -ENODEV;
1559
1560         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1561                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1562                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1563                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1564                 return 0;
1565
1566         return -ENODEV;
1567 }
1568
1569 /*
1570  * acpi_dock_match - see if an acpi object has a _DCK method
1571  */
1572 static int acpi_dock_match(acpi_handle handle)
1573 {
1574         acpi_handle tmp;
1575         return acpi_get_handle(handle, "_DCK", &tmp);
1576 }
1577
1578 const char *acpi_device_hid(struct acpi_device *device)
1579 {
1580         struct acpi_hardware_id *hid;
1581
1582         if (list_empty(&device->pnp.ids))
1583                 return dummy_hid;
1584
1585         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1586         return hid->id;
1587 }
1588 EXPORT_SYMBOL(acpi_device_hid);
1589
1590 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1591 {
1592         struct acpi_hardware_id *id;
1593
1594         id = kmalloc(sizeof(*id), GFP_KERNEL);
1595         if (!id)
1596                 return;
1597
1598         id->id = kstrdup(dev_id, GFP_KERNEL);
1599         if (!id->id) {
1600                 kfree(id);
1601                 return;
1602         }
1603
1604         list_add_tail(&id->list, &pnp->ids);
1605         pnp->type.hardware_id = 1;
1606 }
1607
1608 /*
1609  * Old IBM workstations have a DSDT bug wherein the SMBus object
1610  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1611  * prefix.  Work around this.
1612  */
1613 static int acpi_ibm_smbus_match(acpi_handle handle)
1614 {
1615         acpi_handle h_dummy;
1616         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1617         int result;
1618
1619         if (!dmi_name_in_vendors("IBM"))
1620                 return -ENODEV;
1621
1622         /* Look for SMBS object */
1623         result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
1624         if (result)
1625                 return result;
1626
1627         if (strcmp("SMBS", path.pointer)) {
1628                 result = -ENODEV;
1629                 goto out;
1630         }
1631
1632         /* Does it have the necessary (but misnamed) methods? */
1633         result = -ENODEV;
1634         if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
1635             ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
1636             ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
1637                 result = 0;
1638 out:
1639         kfree(path.pointer);
1640         return result;
1641 }
1642
1643 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1644                                 int device_type)
1645 {
1646         acpi_status status;
1647         struct acpi_device_info *info;
1648         struct acpi_pnp_device_id_list *cid_list;
1649         int i;
1650
1651         switch (device_type) {
1652         case ACPI_BUS_TYPE_DEVICE:
1653                 if (handle == ACPI_ROOT_OBJECT) {
1654                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1655                         break;
1656                 }
1657
1658                 status = acpi_get_object_info(handle, &info);
1659                 if (ACPI_FAILURE(status)) {
1660                         pr_err(PREFIX "%s: Error reading device info\n",
1661                                         __func__);
1662                         return;
1663                 }
1664
1665                 if (info->valid & ACPI_VALID_HID)
1666                         acpi_add_id(pnp, info->hardware_id.string);
1667                 if (info->valid & ACPI_VALID_CID) {
1668                         cid_list = &info->compatible_id_list;
1669                         for (i = 0; i < cid_list->count; i++)
1670                                 acpi_add_id(pnp, cid_list->ids[i].string);
1671                 }
1672                 if (info->valid & ACPI_VALID_ADR) {
1673                         pnp->bus_address = info->address;
1674                         pnp->type.bus_address = 1;
1675                 }
1676                 if (info->valid & ACPI_VALID_UID)
1677                         pnp->unique_id = kstrdup(info->unique_id.string,
1678                                                         GFP_KERNEL);
1679
1680                 kfree(info);
1681
1682                 /*
1683                  * Some devices don't reliably have _HIDs & _CIDs, so add
1684                  * synthetic HIDs to make sure drivers can find them.
1685                  */
1686                 if (acpi_is_video_device(handle))
1687                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1688                 else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1689                         acpi_add_id(pnp, ACPI_BAY_HID);
1690                 else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1691                         acpi_add_id(pnp, ACPI_DOCK_HID);
1692                 else if (!acpi_ibm_smbus_match(handle))
1693                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1694                 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1695                         acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1696                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1697                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1698                 }
1699
1700                 break;
1701         case ACPI_BUS_TYPE_POWER:
1702                 acpi_add_id(pnp, ACPI_POWER_HID);
1703                 break;
1704         case ACPI_BUS_TYPE_PROCESSOR:
1705                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1706                 break;
1707         case ACPI_BUS_TYPE_THERMAL:
1708                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1709                 break;
1710         case ACPI_BUS_TYPE_POWER_BUTTON:
1711                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1712                 break;
1713         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1714                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1715                 break;
1716         }
1717 }
1718
1719 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1720 {
1721         struct acpi_hardware_id *id, *tmp;
1722
1723         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1724                 kfree(id->id);
1725                 kfree(id);
1726         }
1727         kfree(pnp->unique_id);
1728 }
1729
1730 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1731                              int type, unsigned long long sta)
1732 {
1733         INIT_LIST_HEAD(&device->pnp.ids);
1734         device->device_type = type;
1735         device->handle = handle;
1736         device->parent = acpi_bus_get_parent(handle);
1737         STRUCT_TO_INT(device->status) = sta;
1738         acpi_device_get_busid(device);
1739         acpi_set_pnp_ids(handle, &device->pnp, type);
1740         acpi_bus_get_flags(device);
1741         device->flags.match_driver = false;
1742         device_initialize(&device->dev);
1743         dev_set_uevent_suppress(&device->dev, true);
1744 }
1745
1746 void acpi_device_add_finalize(struct acpi_device *device)
1747 {
1748         device->flags.match_driver = true;
1749         dev_set_uevent_suppress(&device->dev, false);
1750         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1751 }
1752
1753 static int acpi_add_single_object(struct acpi_device **child,
1754                                   acpi_handle handle, int type,
1755                                   unsigned long long sta)
1756 {
1757         int result;
1758         struct acpi_device *device;
1759         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1760
1761         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1762         if (!device) {
1763                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1764                 return -ENOMEM;
1765         }
1766
1767         acpi_init_device_object(device, handle, type, sta);
1768         acpi_bus_get_power_flags(device);
1769         acpi_bus_get_wakeup_device_flags(device);
1770
1771         result = acpi_device_add(device, acpi_device_release);
1772         if (result) {
1773                 acpi_device_release(&device->dev);
1774                 return result;
1775         }
1776
1777         acpi_power_add_remove_device(device, true);
1778         acpi_device_add_finalize(device);
1779         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1780         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1781                 dev_name(&device->dev), (char *) buffer.pointer,
1782                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1783         kfree(buffer.pointer);
1784         *child = device;
1785         return 0;
1786 }
1787
1788 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1789                                     unsigned long long *sta)
1790 {
1791         acpi_status status;
1792         acpi_object_type acpi_type;
1793
1794         status = acpi_get_type(handle, &acpi_type);
1795         if (ACPI_FAILURE(status))
1796                 return -ENODEV;
1797
1798         switch (acpi_type) {
1799         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1800         case ACPI_TYPE_DEVICE:
1801                 *type = ACPI_BUS_TYPE_DEVICE;
1802                 status = acpi_bus_get_status_handle(handle, sta);
1803                 if (ACPI_FAILURE(status))
1804                         return -ENODEV;
1805                 break;
1806         case ACPI_TYPE_PROCESSOR:
1807                 *type = ACPI_BUS_TYPE_PROCESSOR;
1808                 status = acpi_bus_get_status_handle(handle, sta);
1809                 if (ACPI_FAILURE(status))
1810                         return -ENODEV;
1811                 break;
1812         case ACPI_TYPE_THERMAL:
1813                 *type = ACPI_BUS_TYPE_THERMAL;
1814                 *sta = ACPI_STA_DEFAULT;
1815                 break;
1816         case ACPI_TYPE_POWER:
1817                 *type = ACPI_BUS_TYPE_POWER;
1818                 *sta = ACPI_STA_DEFAULT;
1819                 break;
1820         default:
1821                 return -ENODEV;
1822         }
1823
1824         return 0;
1825 }
1826
1827 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1828                                        char *idstr,
1829                                        const struct acpi_device_id **matchid)
1830 {
1831         const struct acpi_device_id *devid;
1832
1833         for (devid = handler->ids; devid->id[0]; devid++)
1834                 if (!strcmp((char *)devid->id, idstr)) {
1835                         if (matchid)
1836                                 *matchid = devid;
1837
1838                         return true;
1839                 }
1840
1841         return false;
1842 }
1843
1844 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1845                                         const struct acpi_device_id **matchid)
1846 {
1847         struct acpi_scan_handler *handler;
1848
1849         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1850                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1851                         return handler;
1852
1853         return NULL;
1854 }
1855
1856 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1857 {
1858         if (!!hotplug->enabled == !!val)
1859                 return;
1860
1861         mutex_lock(&acpi_scan_lock);
1862
1863         hotplug->enabled = val;
1864
1865         mutex_unlock(&acpi_scan_lock);
1866 }
1867
1868 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1869 {
1870         struct acpi_device_pnp pnp = {};
1871         struct acpi_hardware_id *hwid;
1872         struct acpi_scan_handler *handler;
1873
1874         INIT_LIST_HEAD(&pnp.ids);
1875         acpi_set_pnp_ids(handle, &pnp, type);
1876
1877         if (!pnp.type.hardware_id)
1878                 goto out;
1879
1880         /*
1881          * This relies on the fact that acpi_install_notify_handler() will not
1882          * install the same notify handler routine twice for the same handle.
1883          */
1884         list_for_each_entry(hwid, &pnp.ids, list) {
1885                 handler = acpi_scan_match_handler(hwid->id, NULL);
1886                 if (handler) {
1887                         acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1888                                         acpi_hotplug_notify_cb, handler);
1889                         break;
1890                 }
1891         }
1892
1893 out:
1894         acpi_free_pnp_ids(&pnp);
1895 }
1896
1897 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1898                                       void *not_used, void **return_value)
1899 {
1900         struct acpi_device *device = NULL;
1901         int type;
1902         unsigned long long sta;
1903         acpi_status status;
1904         int result;
1905
1906         acpi_bus_get_device(handle, &device);
1907         if (device)
1908                 goto out;
1909
1910         result = acpi_bus_type_and_status(handle, &type, &sta);
1911         if (result)
1912                 return AE_OK;
1913
1914         if (type == ACPI_BUS_TYPE_POWER) {
1915                 acpi_add_power_resource(handle);
1916                 return AE_OK;
1917         }
1918
1919         acpi_scan_init_hotplug(handle, type);
1920
1921         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1922             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1923                 struct acpi_device_wakeup wakeup;
1924                 acpi_handle temp;
1925
1926                 status = acpi_get_handle(handle, "_PRW", &temp);
1927                 if (ACPI_SUCCESS(status)) {
1928                         acpi_bus_extract_wakeup_device_power_package(handle,
1929                                                                      &wakeup);
1930                         acpi_power_resources_list_free(&wakeup.resources);
1931                 }
1932                 return AE_CTRL_DEPTH;
1933         }
1934
1935         acpi_add_single_object(&device, handle, type, sta);
1936         if (!device)
1937                 return AE_CTRL_DEPTH;
1938
1939  out:
1940         if (!*return_value)
1941                 *return_value = device;
1942
1943         return AE_OK;
1944 }
1945
1946 static int acpi_scan_attach_handler(struct acpi_device *device)
1947 {
1948         struct acpi_hardware_id *hwid;
1949         int ret = 0;
1950
1951         list_for_each_entry(hwid, &device->pnp.ids, list) {
1952                 const struct acpi_device_id *devid;
1953                 struct acpi_scan_handler *handler;
1954
1955                 handler = acpi_scan_match_handler(hwid->id, &devid);
1956                 if (handler) {
1957                         ret = handler->attach(device, devid);
1958                         if (ret > 0) {
1959                                 device->handler = handler;
1960                                 break;
1961                         } else if (ret < 0) {
1962                                 break;
1963                         }
1964                 }
1965         }
1966         return ret;
1967 }
1968
1969 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1970                                           void *not_used, void **ret_not_used)
1971 {
1972         struct acpi_device *device;
1973         unsigned long long sta_not_used;
1974         int ret;
1975
1976         /*
1977          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1978          * namespace walks prematurely.
1979          */
1980         if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1981                 return AE_OK;
1982
1983         if (acpi_bus_get_device(handle, &device))
1984                 return AE_CTRL_DEPTH;
1985
1986         if (device->handler)
1987                 return AE_OK;
1988
1989         ret = acpi_scan_attach_handler(device);
1990         if (ret)
1991                 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1992
1993         ret = device_attach(&device->dev);
1994         return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1995 }
1996
1997 /**
1998  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1999  * @handle: Root of the namespace scope to scan.
2000  *
2001  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2002  * found devices.
2003  *
2004  * If no devices were found, -ENODEV is returned, but it does not mean that
2005  * there has been a real error.  There just have been no suitable ACPI objects
2006  * in the table trunk from which the kernel could create a device and add an
2007  * appropriate driver.
2008  *
2009  * Must be called under acpi_scan_lock.
2010  */
2011 int acpi_bus_scan(acpi_handle handle)
2012 {
2013         void *device = NULL;
2014         int error = 0;
2015
2016         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2017                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2018                                     acpi_bus_check_add, NULL, NULL, &device);
2019
2020         if (!device)
2021                 error = -ENODEV;
2022         else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
2023                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2024                                     acpi_bus_device_attach, NULL, NULL, NULL);
2025
2026         return error;
2027 }
2028 EXPORT_SYMBOL(acpi_bus_scan);
2029
2030 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
2031                                           void *not_used, void **ret_not_used)
2032 {
2033         struct acpi_device *device = NULL;
2034
2035         if (!acpi_bus_get_device(handle, &device)) {
2036                 struct acpi_scan_handler *dev_handler = device->handler;
2037
2038                 if (dev_handler) {
2039                         if (dev_handler->detach)
2040                                 dev_handler->detach(device);
2041
2042                         device->handler = NULL;
2043                 } else {
2044                         device_release_driver(&device->dev);
2045                 }
2046         }
2047         return AE_OK;
2048 }
2049
2050 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
2051                                    void *not_used, void **ret_not_used)
2052 {
2053         struct acpi_device *device = NULL;
2054
2055         if (!acpi_bus_get_device(handle, &device))
2056                 acpi_device_unregister(device);
2057
2058         return AE_OK;
2059 }
2060
2061 /**
2062  * acpi_bus_trim - Remove ACPI device node and all of its descendants
2063  * @start: Root of the ACPI device nodes subtree to remove.
2064  *
2065  * Must be called under acpi_scan_lock.
2066  */
2067 void acpi_bus_trim(struct acpi_device *start)
2068 {
2069         /*
2070          * Execute acpi_bus_device_detach() as a post-order callback to detach
2071          * all ACPI drivers from the device nodes being removed.
2072          */
2073         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2074                             acpi_bus_device_detach, NULL, NULL);
2075         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
2076         /*
2077          * Execute acpi_bus_remove() as a post-order callback to remove device
2078          * nodes in the given namespace scope.
2079          */
2080         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2081                             acpi_bus_remove, NULL, NULL);
2082         acpi_bus_remove(start->handle, 0, NULL, NULL);
2083 }
2084 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2085
2086 static int acpi_bus_scan_fixed(void)
2087 {
2088         int result = 0;
2089
2090         /*
2091          * Enumerate all fixed-feature devices.
2092          */
2093         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2094                 struct acpi_device *device = NULL;
2095
2096                 result = acpi_add_single_object(&device, NULL,
2097                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2098                                                 ACPI_STA_DEFAULT);
2099                 if (result)
2100                         return result;
2101
2102                 result = device_attach(&device->dev);
2103                 if (result < 0)
2104                         return result;
2105
2106                 device_init_wakeup(&device->dev, true);
2107         }
2108
2109         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2110                 struct acpi_device *device = NULL;
2111
2112                 result = acpi_add_single_object(&device, NULL,
2113                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2114                                                 ACPI_STA_DEFAULT);
2115                 if (result)
2116                         return result;
2117
2118                 result = device_attach(&device->dev);
2119         }
2120
2121         return result < 0 ? result : 0;
2122 }
2123
2124 int __init acpi_scan_init(void)
2125 {
2126         int result;
2127
2128         result = bus_register(&acpi_bus_type);
2129         if (result) {
2130                 /* We don't want to quit even if we failed to add suspend/resume */
2131                 printk(KERN_ERR PREFIX "Could not register bus type\n");
2132         }
2133
2134         acpi_pci_root_init();
2135         acpi_pci_link_init();
2136         acpi_processor_init();
2137         acpi_platform_init();
2138         acpi_lpss_init();
2139         acpi_cmos_rtc_init();
2140         acpi_container_init();
2141         acpi_memory_hotplug_init();
2142         acpi_dock_init();
2143
2144         mutex_lock(&acpi_scan_lock);
2145         /*
2146          * Enumerate devices in the ACPI namespace.
2147          */
2148         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2149         if (result)
2150                 goto out;
2151
2152         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2153         if (result)
2154                 goto out;
2155
2156         result = acpi_bus_scan_fixed();
2157         if (result) {
2158                 acpi_device_unregister(acpi_root);
2159                 goto out;
2160         }
2161
2162         acpi_update_all_gpes();
2163
2164         acpi_pci_root_hp_init();
2165
2166  out:
2167         mutex_unlock(&acpi_scan_lock);
2168         return result;
2169 }