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_device_list);
  39 static LIST_HEAD(acpi_bus_id_list);
  40 static DEFINE_MUTEX(acpi_scan_lock);
  41 static LIST_HEAD(acpi_scan_handlers_list);
  42 DEFINE_MUTEX(acpi_device_lock);
  43 LIST_HEAD(acpi_wakeup_device_list);
  44
  45 struct acpi_device_bus_id{
  46         char bus_id[15];
  47         unsigned int instance_no;
  48         struct list_head node;
  49 };
  50
  51 void acpi_scan_lock_acquire(void)
  52 {
  53         mutex_lock(&acpi_scan_lock);
  54 }
  55 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  56
  57 void acpi_scan_lock_release(void)
  58 {
  59         mutex_unlock(&acpi_scan_lock);
  60 }
  61 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  62
  63 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  64 {
  65         if (!handler || !handler->attach)
  66                 return -EINVAL;
  67
  68         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  69         return 0;
  70 }
  71
  72 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
  73                                        const char *hotplug_profile_name)
  74 {
  75         int error;
  76
  77         error = acpi_scan_add_handler(handler);
  78         if (error)
  79                 return error;
  80
  81         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
  82         return 0;
  83 }
  84
  85 /*
  86  * Creates hid/cid(s) string needed for modalias and uevent
  87  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  88  * char *modalias: "acpi:IBM0001:ACPI0001"
  89 */
  90 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  91                            int size)
  92 {
  93         int len;
  94         int count;
  95         struct acpi_hardware_id *id;
  96
  97         if (list_empty(&acpi_dev->pnp.ids))
  98                 return 0;
  99
 100         len = snprintf(modalias, size, "acpi:");
 101         size -= len;
 102
 103         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
 104                 count = snprintf(&modalias[len], size, "%s:", id->id);
 105                 if (count < 0 || count >= size)
 106                         return -EINVAL;
 107                 len += count;
 108                 size -= count;
 109         }
 110
 111         modalias[len] = '\0';
 112         return len;
 113 }
 114
 115 static ssize_t
 116 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
 117         struct acpi_device *acpi_dev = to_acpi_device(dev);
 118         int len;
 119
 120         /* Device has no HID and no CID or string is >1024 */
 121         len = create_modalias(acpi_dev, buf, 1024);
 122         if (len <= 0)
 123                 return 0;
 124         buf[len++] = '\n';
 125         return len;
 126 }
 127 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 128
 129 static acpi_status acpi_bus_offline_companions(acpi_handle handle, u32 lvl,
 130                                                void *data, void **ret_p)
 131 {
 132         struct acpi_device *device = NULL;
 133         struct acpi_device_physical_node *pn;
 134         bool second_pass = (bool)data;
 135         acpi_status status = AE_OK;
 136
 137         if (acpi_bus_get_device(handle, &device))
 138                 return AE_OK;
 139
 140         mutex_lock(&device->physical_node_lock);
 141
 142         list_for_each_entry(pn, &device->physical_node_list, node) {
 143                 int ret;
 144
 145                 if (second_pass) {
 146                         /* Skip devices offlined by the first pass. */
 147                         if (pn->put_online)
 148                                 continue;
 149                 } else {
 150                         pn->put_online = false;
 151                 }
 152                 ret = device_offline(pn->dev);
 153                 if (acpi_force_hot_remove)
 154                         continue;
 155
 156                 if (ret >= 0) {
 157                         pn->put_online = !ret;
 158                 } else {
 159                         *ret_p = pn->dev;
 160                         if (second_pass) {
 161                                 status = AE_ERROR;
 162                                 break;
 163                         }
 164                 }
 165         }
 166
 167         mutex_unlock(&device->physical_node_lock);
 168
 169         return status;
 170 }
 171
 172 static acpi_status acpi_bus_online_companions(acpi_handle handle, u32 lvl,
 173                                               void *data, void **ret_p)
 174 {
 175         struct acpi_device *device = NULL;
 176         struct acpi_device_physical_node *pn;
 177
 178         if (acpi_bus_get_device(handle, &device))
 179                 return AE_OK;
 180
 181         mutex_lock(&device->physical_node_lock);
 182
 183         list_for_each_entry(pn, &device->physical_node_list, node)
 184                 if (pn->put_online) {
 185                         device_online(pn->dev);
 186                         pn->put_online = false;
 187                 }
 188
 189         mutex_unlock(&device->physical_node_lock);
 190
 191         return AE_OK;
 192 }
 193
 194 static int acpi_scan_hot_remove(struct acpi_device *device)
 195 {
 196         acpi_handle handle = device->handle;
 197         acpi_handle not_used;
 198         struct acpi_object_list arg_list;
 199         union acpi_object arg;
 200         struct device *errdev;
 201         acpi_status status;
 202         unsigned long long sta;
 203
 204         /* If there is no handle, the device node has been unregistered. */
 205         if (!handle) {
 206                 dev_dbg(&device->dev, "ACPI handle missing\n");
 207                 put_device(&device->dev);
 208                 return -EINVAL;
 209         }
 210
 211         lock_device_hotplug();
 212
 213         /*
 214          * Carry out two passes here and ignore errors in the first pass,
 215          * because if the devices in question are memory blocks and
 216          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 217          * that the other blocks depend on, but it is not known in advance which
 218          * block holds them.
 219          *
 220          * If the first pass is successful, the second one isn't needed, though.
 221          */
 222         errdev = NULL;
 223         acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 224                             NULL, acpi_bus_offline_companions,
 225                             (void *)false, (void **)&errdev);
 226         acpi_bus_offline_companions(handle, 0, (void *)false, (void **)&errdev);
 227         if (errdev) {
 228                 errdev = NULL;
 229                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 230                                     NULL, acpi_bus_offline_companions,
 231                                     (void *)true , (void **)&errdev);
 232                 if (!errdev || acpi_force_hot_remove)
 233                         acpi_bus_offline_companions(handle, 0, (void *)true,
 234                                                     (void **)&errdev);
 235
 236                 if (errdev && !acpi_force_hot_remove) {
 237                         dev_warn(errdev, "Offline failed.\n");
 238                         acpi_bus_online_companions(handle, 0, NULL, NULL);
 239                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 240                                             ACPI_UINT32_MAX,
 241                                             acpi_bus_online_companions, NULL,
 242                                             NULL, NULL);
 243
 244                         unlock_device_hotplug();
 245
 246                         put_device(&device->dev);
 247                         return -EBUSY;
 248                 }
 249         }
 250
 251         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 252                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 253
 254         acpi_bus_trim(device);
 255
 256         unlock_device_hotplug();
 257
 258         /* Device node has been unregistered. */
 259         put_device(&device->dev);
 260         device = NULL;
 261
 262         if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &not_used))) {
 263                 arg_list.count = 1;
 264                 arg_list.pointer = &arg;
 265                 arg.type = ACPI_TYPE_INTEGER;
 266                 arg.integer.value = 0;
 267                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 268         }
 269
 270         arg_list.count = 1;
 271         arg_list.pointer = &arg;
 272         arg.type = ACPI_TYPE_INTEGER;
 273         arg.integer.value = 1;
 274
 275         /*
 276          * TBD: _EJD support.
 277          */
 278         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 279         if (ACPI_FAILURE(status)) {
 280                 if (status == AE_NOT_FOUND) {
 281                         return -ENODEV;
 282                 } else {
 283                         acpi_handle_warn(handle, "Eject failed (0x%x)\n",
 284                                                                 status);
 285                         return -EIO;
 286                 }
 287         }
 288
 289         /*
 290          * Verify if eject was indeed successful.  If not, log an error
 291          * message.  No need to call _OST since _EJ0 call was made OK.
 292          */
 293         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 294         if (ACPI_FAILURE(status)) {
 295                 acpi_handle_warn(handle,
 296                         "Status check after eject failed (0x%x)\n", status);
 297         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 298                 acpi_handle_warn(handle,
 299                         "Eject incomplete - status 0x%llx\n", sta);
 300         }
 301
 302         return 0;
 303 }
 304
 305 static void acpi_bus_device_eject(void *context)
 306 {
 307         acpi_handle handle = context;
 308         struct acpi_device *device = NULL;
 309         struct acpi_scan_handler *handler;
 310         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 311
 312         mutex_lock(&acpi_scan_lock);
 313
 314         acpi_bus_get_device(handle, &device);
 315         if (!device)
 316                 goto err_out;
 317
 318         handler = device->handler;
 319         if (!handler || !handler->hotplug.enabled) {
 320                 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 321                 goto err_out;
 322         }
 323         acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
 324                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 325         if (handler->hotplug.mode == AHM_CONTAINER) {
 326                 device->flags.eject_pending = true;
 327                 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 328         } else {
 329                 int error;
 330
 331                 get_device(&device->dev);
 332                 error = acpi_scan_hot_remove(device);
 333                 if (error)
 334                         goto err_out;
 335         }
 336
 337  out:
 338         mutex_unlock(&acpi_scan_lock);
 339         return;
 340
 341  err_out:
 342         acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
 343                                   NULL);
 344         goto out;
 345 }
 346
 347 static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
 348 {
 349         struct acpi_device *device = NULL;
 350         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 351         int error;
 352
 353         mutex_lock(&acpi_scan_lock);
 354         lock_device_hotplug();
 355
 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         acpi_evaluate_hotplug_ost(handle, ost_source,
 362                                   ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
 363         error = acpi_bus_scan(handle);
 364         if (error) {
 365                 acpi_handle_warn(handle, "Namespace scan failure\n");
 366                 goto out;
 367         }
 368         error = acpi_bus_get_device(handle, &device);
 369         if (error) {
 370                 acpi_handle_warn(handle, "Missing device node object\n");
 371                 goto out;
 372         }
 373         ost_code = ACPI_OST_SC_SUCCESS;
 374         if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
 375                 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 376
 377  out:
 378         unlock_device_hotplug();
 379         acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
 380         mutex_unlock(&acpi_scan_lock);
 381 }
 382
 383 static void acpi_scan_bus_check(void *context)
 384 {
 385         acpi_scan_bus_device_check((acpi_handle)context,
 386                                    ACPI_NOTIFY_BUS_CHECK);
 387 }
 388
 389 static void acpi_scan_device_check(void *context)
 390 {
 391         acpi_scan_bus_device_check((acpi_handle)context,
 392                                    ACPI_NOTIFY_DEVICE_CHECK);
 393 }
 394
 395 static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
 396 {
 397         u32 ost_status;
 398
 399         switch (type) {
 400         case ACPI_NOTIFY_BUS_CHECK:
 401                 acpi_handle_debug(handle,
 402                         "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
 403                 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
 404                 break;
 405         case ACPI_NOTIFY_DEVICE_CHECK:
 406                 acpi_handle_debug(handle,
 407                         "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
 408                 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
 409                 break;
 410         case ACPI_NOTIFY_EJECT_REQUEST:
 411                 acpi_handle_debug(handle,
 412                         "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
 413                 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 414                 break;
 415         default:
 416                 /* non-hotplug event; possibly handled by other handler */
 417                 return;
 418         }
 419
 420         acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
 421 }
 422
 423 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
 424 {
 425         acpi_osd_exec_callback callback;
 426         struct acpi_scan_handler *handler = data;
 427         acpi_status status;
 428
 429         if (!handler->hotplug.enabled)
 430                 return acpi_hotplug_unsupported(handle, type);
 431
 432         switch (type) {
 433         case ACPI_NOTIFY_BUS_CHECK:
 434                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 435                 callback = acpi_scan_bus_check;
 436                 break;
 437         case ACPI_NOTIFY_DEVICE_CHECK:
 438                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 439                 callback = acpi_scan_device_check;
 440                 break;
 441         case ACPI_NOTIFY_EJECT_REQUEST:
 442                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 443                 callback = acpi_bus_device_eject;
 444                 break;
 445         default:
 446                 /* non-hotplug event; possibly handled by other handler */
 447                 return;
 448         }
 449         status = acpi_os_hotplug_execute(callback, handle);
 450         if (ACPI_FAILURE(status))
 451                 acpi_evaluate_hotplug_ost(handle, type,
 452                                           ACPI_OST_SC_NON_SPECIFIC_FAILURE,
 453                                           NULL);
 454 }
 455
 456 /**
 457  * acpi_bus_hot_remove_device: hot-remove a device and its children
 458  * @context: struct acpi_eject_event pointer (freed in this func)
 459  *
 460  * Hot-remove a device and its children. This function frees up the
 461  * memory space passed by arg context, so that the caller may call
 462  * this function asynchronously through acpi_os_hotplug_execute().
 463  */
 464 void acpi_bus_hot_remove_device(void *context)
 465 {
 466         struct acpi_eject_event *ej_event = context;
 467         struct acpi_device *device = ej_event->device;
 468         acpi_handle handle = device->handle;
 469         int error;
 470
 471         mutex_lock(&acpi_scan_lock);
 472
 473         error = acpi_scan_hot_remove(device);
 474         if (error && handle)
 475                 acpi_evaluate_hotplug_ost(handle, ej_event->event,
 476                                           ACPI_OST_SC_NON_SPECIFIC_FAILURE,
 477                                           NULL);
 478
 479         mutex_unlock(&acpi_scan_lock);
 480         kfree(context);
 481 }
 482 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 483
 484 static ssize_t real_power_state_show(struct device *dev,
 485                                      struct device_attribute *attr, char *buf)
 486 {
 487         struct acpi_device *adev = to_acpi_device(dev);
 488         int state;
 489         int ret;
 490
 491         ret = acpi_device_get_power(adev, &state);
 492         if (ret)
 493                 return ret;
 494
 495         return sprintf(buf, "%s\n", acpi_power_state_string(state));
 496 }
 497
 498 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 499
 500 static ssize_t power_state_show(struct device *dev,
 501                                 struct device_attribute *attr, char *buf)
 502 {
 503         struct acpi_device *adev = to_acpi_device(dev);
 504
 505         return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 506 }
 507
 508 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 509
 510 static ssize_t
 511 acpi_eject_store(struct device *d, struct device_attribute *attr,
 512                 const char *buf, size_t count)
 513 {
 514         struct acpi_device *acpi_device = to_acpi_device(d);
 515         struct acpi_eject_event *ej_event;
 516         acpi_object_type not_used;
 517         acpi_status status;
 518         u32 ost_source;
 519         int ret;
 520
 521         if (!count || buf[0] != '1')
 522                 return -EINVAL;
 523
 524         if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
 525             && !acpi_device->driver)
 526                 return -ENODEV;
 527
 528         status = acpi_get_type(acpi_device->handle, &not_used);
 529         if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
 530                 return -ENODEV;
 531
 532         mutex_lock(&acpi_scan_lock);
 533
 534         if (acpi_device->flags.eject_pending) {
 535                 /* ACPI eject notification event. */
 536                 ost_source = ACPI_NOTIFY_EJECT_REQUEST;
 537                 acpi_device->flags.eject_pending = 0;
 538         } else {
 539                 /* Eject initiated by user space. */
 540                 ost_source = ACPI_OST_EC_OSPM_EJECT;
 541         }
 542         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 543         if (!ej_event) {
 544                 ret = -ENOMEM;
 545                 goto err_out;
 546         }
 547         acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
 548                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 549         ej_event->device = acpi_device;
 550         ej_event->event = ost_source;
 551         get_device(&acpi_device->dev);
 552         status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
 553         if (ACPI_FAILURE(status)) {
 554                 put_device(&acpi_device->dev);
 555                 kfree(ej_event);
 556                 ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
 557                 goto err_out;
 558         }
 559         ret = count;
 560
 561  out:
 562         mutex_unlock(&acpi_scan_lock);
 563         return ret;
 564
 565  err_out:
 566         acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
 567                                   ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 568         goto out;
 569 }
 570
 571 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 572
 573 static ssize_t
 574 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 575         struct acpi_device *acpi_dev = to_acpi_device(dev);
 576
 577         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 578 }
 579 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 580
 581 static ssize_t acpi_device_uid_show(struct device *dev,
 582                                     struct device_attribute *attr, char *buf)
 583 {
 584         struct acpi_device *acpi_dev = to_acpi_device(dev);
 585
 586         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 587 }
 588 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 589
 590 static ssize_t acpi_device_adr_show(struct device *dev,
 591                                     struct device_attribute *attr, char *buf)
 592 {
 593         struct acpi_device *acpi_dev = to_acpi_device(dev);
 594
 595         return sprintf(buf, "0x%08x\n",
 596                        (unsigned int)(acpi_dev->pnp.bus_address));
 597 }
 598 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 599
 600 static ssize_t
 601 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 602         struct acpi_device *acpi_dev = to_acpi_device(dev);
 603         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 604         int result;
 605
 606         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 607         if (result)
 608                 goto end;
 609
 610         result = sprintf(buf, "%s\n", (char*)path.pointer);
 611         kfree(path.pointer);
 612 end:
 613         return result;
 614 }
 615 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 616
 617 /* sysfs file that shows description text from the ACPI _STR method */
 618 static ssize_t description_show(struct device *dev,
 619                                 struct device_attribute *attr,
 620                                 char *buf) {
 621         struct acpi_device *acpi_dev = to_acpi_device(dev);
 622         int result;
 623
 624         if (acpi_dev->pnp.str_obj == NULL)
 625                 return 0;
 626
 627         /*
 628          * The _STR object contains a Unicode identifier for a device.
 629          * We need to convert to utf-8 so it can be displayed.
 630          */
 631         result = utf16s_to_utf8s(
 632                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 633                 acpi_dev->pnp.str_obj->buffer.length,
 634                 UTF16_LITTLE_ENDIAN, buf,
 635                 PAGE_SIZE);
 636
 637         buf[result++] = '\n';
 638
 639         return result;
 640 }
 641 static DEVICE_ATTR(description, 0444, description_show, NULL);
 642
 643 static ssize_t
 644 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 645                      char *buf) {
 646         struct acpi_device *acpi_dev = to_acpi_device(dev);
 647
 648         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 649 }
 650 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 651
 652 static int acpi_device_setup_files(struct acpi_device *dev)
 653 {
 654         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 655         acpi_status status;
 656         acpi_handle temp;
 657         unsigned long long sun;
 658         int result = 0;
 659
 660         /*
 661          * Devices gotten from FADT don't have a "path" attribute
 662          */
 663         if (dev->handle) {
 664                 result = device_create_file(&dev->dev, &dev_attr_path);
 665                 if (result)
 666                         goto end;
 667         }
 668
 669         if (!list_empty(&dev->pnp.ids)) {
 670                 result = device_create_file(&dev->dev, &dev_attr_hid);
 671                 if (result)
 672                         goto end;
 673
 674                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 675                 if (result)
 676                         goto end;
 677         }
 678
 679         /*
 680          * If device has _STR, 'description' file is created
 681          */
 682         status = acpi_get_handle(dev->handle, "_STR", &temp);
 683         if (ACPI_SUCCESS(status)) {
 684                 status = acpi_evaluate_object(dev->handle, "_STR",
 685                                         NULL, &buffer);
 686                 if (ACPI_FAILURE(status))
 687                         buffer.pointer = NULL;
 688                 dev->pnp.str_obj = buffer.pointer;
 689                 result = device_create_file(&dev->dev, &dev_attr_description);
 690                 if (result)
 691                         goto end;
 692         }
 693
 694         if (dev->pnp.type.bus_address)
 695                 result = device_create_file(&dev->dev, &dev_attr_adr);
 696         if (dev->pnp.unique_id)
 697                 result = device_create_file(&dev->dev, &dev_attr_uid);
 698
 699         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 700         if (ACPI_SUCCESS(status)) {
 701                 dev->pnp.sun = (unsigned long)sun;
 702                 result = device_create_file(&dev->dev, &dev_attr_sun);
 703                 if (result)
 704                         goto end;
 705         } else {
 706                 dev->pnp.sun = (unsigned long)-1;
 707         }
 708
 709         /*
 710          * If device has _EJ0, 'eject' file is created that is used to trigger
 711          * hot-removal function from userland.
 712          */
 713         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 714         if (ACPI_SUCCESS(status)) {
 715                 result = device_create_file(&dev->dev, &dev_attr_eject);
 716                 if (result)
 717                         return result;
 718         }
 719
 720         if (dev->flags.power_manageable) {
 721                 result = device_create_file(&dev->dev, &dev_attr_power_state);
 722                 if (result)
 723                         return result;
 724
 725                 if (dev->power.flags.power_resources)
 726                         result = device_create_file(&dev->dev,
 727                                                     &dev_attr_real_power_state);
 728         }
 729
 730 end:
 731         return result;
 732 }
 733
 734 static void acpi_device_remove_files(struct acpi_device *dev)
 735 {
 736         acpi_status status;
 737         acpi_handle temp;
 738
 739         if (dev->flags.power_manageable) {
 740                 device_remove_file(&dev->dev, &dev_attr_power_state);
 741                 if (dev->power.flags.power_resources)
 742                         device_remove_file(&dev->dev,
 743                                            &dev_attr_real_power_state);
 744         }
 745
 746         /*
 747          * If device has _STR, remove 'description' file
 748          */
 749         status = acpi_get_handle(dev->handle, "_STR", &temp);
 750         if (ACPI_SUCCESS(status)) {
 751                 kfree(dev->pnp.str_obj);
 752                 device_remove_file(&dev->dev, &dev_attr_description);
 753         }
 754         /*
 755          * If device has _EJ0, remove 'eject' file.
 756          */
 757         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 758         if (ACPI_SUCCESS(status))
 759                 device_remove_file(&dev->dev, &dev_attr_eject);
 760
 761         status = acpi_get_handle(dev->handle, "_SUN", &temp);
 762         if (ACPI_SUCCESS(status))
 763                 device_remove_file(&dev->dev, &dev_attr_sun);
 764
 765         if (dev->pnp.unique_id)
 766                 device_remove_file(&dev->dev, &dev_attr_uid);
 767         if (dev->pnp.type.bus_address)
 768                 device_remove_file(&dev->dev, &dev_attr_adr);
 769         device_remove_file(&dev->dev, &dev_attr_modalias);
 770         device_remove_file(&dev->dev, &dev_attr_hid);
 771         if (dev->handle)
 772                 device_remove_file(&dev->dev, &dev_attr_path);
 773 }
 774 /* --------------------------------------------------------------------------
 775                         ACPI Bus operations
 776    -------------------------------------------------------------------------- */
 777
 778 static const struct acpi_device_id *__acpi_match_device(
 779         struct acpi_device *device, const struct acpi_device_id *ids)
 780 {
 781         const struct acpi_device_id *id;
 782         struct acpi_hardware_id *hwid;
 783
 784         /*
 785          * If the device is not present, it is unnecessary to load device
 786          * driver for it.
 787          */
 788         if (!device->status.present)
 789                 return NULL;
 790
 791         for (id = ids; id->id[0]; id++)
 792                 list_for_each_entry(hwid, &device->pnp.ids, list)
 793                         if (!strcmp((char *) id->id, hwid->id))
 794                                 return id;
 795
 796         return NULL;
 797 }
 798
 799 /**
 800  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 801  * @ids: Array of struct acpi_device_id object to match against.
 802  * @dev: The device structure to match.
 803  *
 804  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 805  * object for that handle and use that object to match against a given list of
 806  * device IDs.
 807  *
 808  * Return a pointer to the first matching ID on success or %NULL on failure.
 809  */
 810 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 811                                                const struct device *dev)
 812 {
 813         struct acpi_device *adev;
 814         acpi_handle handle = ACPI_HANDLE(dev);
 815
 816         if (!ids || !handle || acpi_bus_get_device(handle, &adev))
 817                 return NULL;
 818
 819         return __acpi_match_device(adev, ids);
 820 }
 821 EXPORT_SYMBOL_GPL(acpi_match_device);
 822
 823 int acpi_match_device_ids(struct acpi_device *device,
 824                           const struct acpi_device_id *ids)
 825 {
 826         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 827 }
 828 EXPORT_SYMBOL(acpi_match_device_ids);
 829
 830 static void acpi_free_power_resources_lists(struct acpi_device *device)
 831 {
 832         int i;
 833
 834         if (device->wakeup.flags.valid)
 835                 acpi_power_resources_list_free(&device->wakeup.resources);
 836
 837         if (!device->flags.power_manageable)
 838                 return;
 839
 840         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 841                 struct acpi_device_power_state *ps = &device->power.states[i];
 842                 acpi_power_resources_list_free(&ps->resources);
 843         }
 844 }
 845
 846 static void acpi_device_release(struct device *dev)
 847 {
 848         struct acpi_device *acpi_dev = to_acpi_device(dev);
 849
 850         acpi_free_pnp_ids(&acpi_dev->pnp);
 851         acpi_free_power_resources_lists(acpi_dev);
 852         kfree(acpi_dev);
 853 }
 854
 855 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 856 {
 857         struct acpi_device *acpi_dev = to_acpi_device(dev);
 858         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 859
 860         return acpi_dev->flags.match_driver
 861                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 862 }
 863
 864 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 865 {
 866         struct acpi_device *acpi_dev = to_acpi_device(dev);
 867         int len;
 868
 869         if (list_empty(&acpi_dev->pnp.ids))
 870                 return 0;
 871
 872         if (add_uevent_var(env, "MODALIAS="))
 873                 return -ENOMEM;
 874         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 875                               sizeof(env->buf) - env->buflen);
 876         if (len >= (sizeof(env->buf) - env->buflen))
 877                 return -ENOMEM;
 878         env->buflen += len;
 879         return 0;
 880 }
 881
 882 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 883 {
 884         struct acpi_device *device = data;
 885
 886         device->driver->ops.notify(device, event);
 887 }
 888
 889 static acpi_status acpi_device_notify_fixed(void *data)
 890 {
 891         struct acpi_device *device = data;
 892
 893         /* Fixed hardware devices have no handles */
 894         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 895         return AE_OK;
 896 }
 897
 898 static int acpi_device_install_notify_handler(struct acpi_device *device)
 899 {
 900         acpi_status status;
 901
 902         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 903                 status =
 904                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 905                                                      acpi_device_notify_fixed,
 906                                                      device);
 907         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 908                 status =
 909                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 910                                                      acpi_device_notify_fixed,
 911                                                      device);
 912         else
 913                 status = acpi_install_notify_handler(device->handle,
 914                                                      ACPI_DEVICE_NOTIFY,
 915                                                      acpi_device_notify,
 916                                                      device);
 917
 918         if (ACPI_FAILURE(status))
 919                 return -EINVAL;
 920         return 0;
 921 }
 922
 923 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 924 {
 925         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 926                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 927                                                 acpi_device_notify_fixed);
 928         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 929                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 930                                                 acpi_device_notify_fixed);
 931         else
 932                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 933                                            acpi_device_notify);
 934 }
 935
 936 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 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         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 944         if (!ret) {
 945                 if (acpi_drv->ops.notify) {
 946                         ret = acpi_device_install_notify_handler(acpi_dev);
 947                         if (ret) {
 948                                 if (acpi_drv->ops.remove)
 949                                         acpi_drv->ops.remove(acpi_dev);
 950                                 acpi_dev->driver = NULL;
 951                                 acpi_dev->driver_data = NULL;
 952                                 return ret;
 953                         }
 954                 }
 955
 956                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 957                         "Found driver [%s] for device [%s]\n",
 958                         acpi_drv->name, acpi_dev->pnp.bus_id));
 959                 get_device(dev);
 960         }
 961         return ret;
 962 }
 963
 964 static int acpi_device_remove(struct device * dev)
 965 {
 966         struct acpi_device *acpi_dev = to_acpi_device(dev);
 967         struct acpi_driver *acpi_drv = acpi_dev->driver;
 968
 969         if (acpi_drv) {
 970                 if (acpi_drv->ops.notify)
 971                         acpi_device_remove_notify_handler(acpi_dev);
 972                 if (acpi_drv->ops.remove)
 973                         acpi_drv->ops.remove(acpi_dev);
 974         }
 975         acpi_dev->driver = NULL;
 976         acpi_dev->driver_data = NULL;
 977
 978         put_device(dev);
 979         return 0;
 980 }
 981
 982 struct bus_type acpi_bus_type = {
 983         .name           = "acpi",
 984         .match          = acpi_bus_match,
 985         .probe          = acpi_device_probe,
 986         .remove         = acpi_device_remove,
 987         .uevent         = acpi_device_uevent,
 988 };
 989
 990 int acpi_device_add(struct acpi_device *device,
 991                     void (*release)(struct device *))
 992 {
 993         int result;
 994         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 995         int found = 0;
 996
 997         if (device->handle) {
 998                 acpi_status status;
 999
1000                 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
1001                                           device);
1002                 if (ACPI_FAILURE(status)) {
1003                         acpi_handle_err(device->handle,
1004                                         "Unable to attach device data\n");
1005                         return -ENODEV;
1006                 }
1007         }
1008
1009         /*
1010          * Linkage
1011          * -------
1012          * Link this device to its parent and siblings.
1013          */
1014         INIT_LIST_HEAD(&device->children);
1015         INIT_LIST_HEAD(&device->node);
1016         INIT_LIST_HEAD(&device->wakeup_list);
1017         INIT_LIST_HEAD(&device->physical_node_list);
1018         mutex_init(&device->physical_node_lock);
1019         INIT_LIST_HEAD(&device->power_dependent);
1020
1021         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1022         if (!new_bus_id) {
1023                 pr_err(PREFIX "Memory allocation error\n");
1024                 result = -ENOMEM;
1025                 goto err_detach;
1026         }
1027
1028         mutex_lock(&acpi_device_lock);
1029         /*
1030          * Find suitable bus_id and instance number in acpi_bus_id_list
1031          * If failed, create one and link it into acpi_bus_id_list
1032          */
1033         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1034                 if (!strcmp(acpi_device_bus_id->bus_id,
1035                             acpi_device_hid(device))) {
1036                         acpi_device_bus_id->instance_no++;
1037                         found = 1;
1038                         kfree(new_bus_id);
1039                         break;
1040                 }
1041         }
1042         if (!found) {
1043                 acpi_device_bus_id = new_bus_id;
1044                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1045                 acpi_device_bus_id->instance_no = 0;
1046                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1047         }
1048         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1049
1050         if (device->parent)
1051                 list_add_tail(&device->node, &device->parent->children);
1052
1053         if (device->wakeup.flags.valid)
1054                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1055         mutex_unlock(&acpi_device_lock);
1056
1057         if (device->parent)
1058                 device->dev.parent = &device->parent->dev;
1059         device->dev.bus = &acpi_bus_type;
1060         device->dev.release = release;
1061         result = device_add(&device->dev);
1062         if (result) {
1063                 dev_err(&device->dev, "Error registering device\n");
1064                 goto err;
1065         }
1066
1067         result = acpi_device_setup_files(device);
1068         if (result)
1069                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1070                        dev_name(&device->dev));
1071
1072         return 0;
1073
1074  err:
1075         mutex_lock(&acpi_device_lock);
1076         if (device->parent)
1077                 list_del(&device->node);
1078         list_del(&device->wakeup_list);
1079         mutex_unlock(&acpi_device_lock);
1080
1081  err_detach:
1082         acpi_detach_data(device->handle, acpi_bus_data_handler);
1083         return result;
1084 }
1085
1086 static void acpi_device_unregister(struct acpi_device *device)
1087 {
1088         mutex_lock(&acpi_device_lock);
1089         if (device->parent)
1090                 list_del(&device->node);
1091
1092         list_del(&device->wakeup_list);
1093         mutex_unlock(&acpi_device_lock);
1094
1095         acpi_detach_data(device->handle, acpi_bus_data_handler);
1096
1097         acpi_power_add_remove_device(device, false);
1098         acpi_device_remove_files(device);
1099         if (device->remove)
1100                 device->remove(device);
1101
1102         device_del(&device->dev);
1103         /*
1104          * Transition the device to D3cold to drop the reference counts of all
1105          * power resources the device depends on and turn off the ones that have
1106          * no more references.
1107          */
1108         acpi_device_set_power(device, ACPI_STATE_D3_COLD);
1109         device->handle = NULL;
1110         put_device(&device->dev);
1111 }
1112
1113 /* --------------------------------------------------------------------------
1114                                  Driver Management
1115    -------------------------------------------------------------------------- */
1116 /**
1117  * acpi_bus_driver_init - add a device to a driver
1118  * @device: the device to add and initialize
1119  * @driver: driver for the device
1120  *
1121  * Used to initialize a device via its device driver.  Called whenever a
1122  * driver is bound to a device.  Invokes the driver's add() ops.
1123  */
1124 static int
1125 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
1126 {
1127         int result = 0;
1128
1129         if (!device || !driver)
1130                 return -EINVAL;
1131
1132         if (!driver->ops.add)
1133                 return -ENOSYS;
1134
1135         result = driver->ops.add(device);
1136         if (result) {
1137                 device->driver = NULL;
1138                 device->driver_data = NULL;
1139                 return result;
1140         }
1141
1142         device->driver = driver;
1143
1144         /*
1145          * TBD - Configuration Management: Assign resources to device based
1146          * upon possible configuration and currently allocated resources.
1147          */
1148
1149         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1150                           "Driver successfully bound to device\n"));
1151         return 0;
1152 }
1153
1154 /**
1155  * acpi_bus_register_driver - register a driver with the ACPI bus
1156  * @driver: driver being registered
1157  *
1158  * Registers a driver with the ACPI bus.  Searches the namespace for all
1159  * devices that match the driver's criteria and binds.  Returns zero for
1160  * success or a negative error status for failure.
1161  */
1162 int acpi_bus_register_driver(struct acpi_driver *driver)
1163 {
1164         int ret;
1165
1166         if (acpi_disabled)
1167                 return -ENODEV;
1168         driver->drv.name = driver->name;
1169         driver->drv.bus = &acpi_bus_type;
1170         driver->drv.owner = driver->owner;
1171
1172         ret = driver_register(&driver->drv);
1173         return ret;
1174 }
1175
1176 EXPORT_SYMBOL(acpi_bus_register_driver);
1177
1178 /**
1179  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1180  * @driver: driver to unregister
1181  *
1182  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
1183  * devices that match the driver's criteria and unbinds.
1184  */
1185 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1186 {
1187         driver_unregister(&driver->drv);
1188 }
1189
1190 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1191
1192 /* --------------------------------------------------------------------------
1193                                  Device Enumeration
1194    -------------------------------------------------------------------------- */
1195 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1196 {
1197         struct acpi_device *device = NULL;
1198         acpi_status status;
1199
1200         /*
1201          * Fixed hardware devices do not appear in the namespace and do not
1202          * have handles, but we fabricate acpi_devices for them, so we have
1203          * to deal with them specially.
1204          */
1205         if (!handle)
1206                 return acpi_root;
1207
1208         do {
1209                 status = acpi_get_parent(handle, &handle);
1210                 if (ACPI_FAILURE(status))
1211                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
1212         } while (acpi_bus_get_device(handle, &device));
1213         return device;
1214 }
1215
1216 acpi_status
1217 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1218 {
1219         acpi_status status;
1220         acpi_handle tmp;
1221         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1222         union acpi_object *obj;
1223
1224         status = acpi_get_handle(handle, "_EJD", &tmp);
1225         if (ACPI_FAILURE(status))
1226                 return status;
1227
1228         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1229         if (ACPI_SUCCESS(status)) {
1230                 obj = buffer.pointer;
1231                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1232                                          ejd);
1233                 kfree(buffer.pointer);
1234         }
1235         return status;
1236 }
1237 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1238
1239 void acpi_bus_data_handler(acpi_handle handle, void *context)
1240 {
1241
1242         /* TBD */
1243
1244         return;
1245 }
1246
1247 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1248                                         struct acpi_device_wakeup *wakeup)
1249 {
1250         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1251         union acpi_object *package = NULL;
1252         union acpi_object *element = NULL;
1253         acpi_status status;
1254         int err = -ENODATA;
1255
1256         if (!wakeup)
1257                 return -EINVAL;
1258
1259         INIT_LIST_HEAD(&wakeup->resources);
1260
1261         /* _PRW */
1262         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1263         if (ACPI_FAILURE(status)) {
1264                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1265                 return err;
1266         }
1267
1268         package = (union acpi_object *)buffer.pointer;
1269
1270         if (!package || package->package.count < 2)
1271                 goto out;
1272
1273         element = &(package->package.elements[0]);
1274         if (!element)
1275                 goto out;
1276
1277         if (element->type == ACPI_TYPE_PACKAGE) {
1278                 if ((element->package.count < 2) ||
1279                     (element->package.elements[0].type !=
1280                      ACPI_TYPE_LOCAL_REFERENCE)
1281                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1282                         goto out;
1283
1284                 wakeup->gpe_device =
1285                     element->package.elements[0].reference.handle;
1286                 wakeup->gpe_number =
1287                     (u32) element->package.elements[1].integer.value;
1288         } else if (element->type == ACPI_TYPE_INTEGER) {
1289                 wakeup->gpe_device = NULL;
1290                 wakeup->gpe_number = element->integer.value;
1291         } else {
1292                 goto out;
1293         }
1294
1295         element = &(package->package.elements[1]);
1296         if (element->type != ACPI_TYPE_INTEGER)
1297                 goto out;
1298
1299         wakeup->sleep_state = element->integer.value;
1300
1301         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1302         if (err)
1303                 goto out;
1304
1305         if (!list_empty(&wakeup->resources)) {
1306                 int sleep_state;
1307
1308                 err = acpi_power_wakeup_list_init(&wakeup->resources,
1309                                                   &sleep_state);
1310                 if (err) {
1311                         acpi_handle_warn(handle, "Retrieving current states "
1312                                          "of wakeup power resources failed\n");
1313                         acpi_power_resources_list_free(&wakeup->resources);
1314                         goto out;
1315                 }
1316                 if (sleep_state < wakeup->sleep_state) {
1317                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
1318                                          "(S%d) by S%d from power resources\n",
1319                                          (int)wakeup->sleep_state, sleep_state);
1320                         wakeup->sleep_state = sleep_state;
1321                 }
1322         }
1323         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1324
1325  out:
1326         kfree(buffer.pointer);
1327         return err;
1328 }
1329
1330 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1331 {
1332         struct acpi_device_id button_device_ids[] = {
1333                 {"PNP0C0C", 0},
1334                 {"PNP0C0D", 0},
1335                 {"PNP0C0E", 0},
1336                 {"", 0},
1337         };
1338         acpi_status status;
1339         acpi_event_status event_status;
1340
1341         device->wakeup.flags.notifier_present = 0;
1342
1343         /* Power button, Lid switch always enable wakeup */
1344         if (!acpi_match_device_ids(device, button_device_ids)) {
1345                 device->wakeup.flags.run_wake = 1;
1346                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1347                         /* Do not use Lid/sleep button for S5 wakeup */
1348                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
1349                                 device->wakeup.sleep_state = ACPI_STATE_S4;
1350                 }
1351                 device_set_wakeup_capable(&device->dev, true);
1352                 return;
1353         }
1354
1355         status = acpi_get_gpe_status(device->wakeup.gpe_device,
1356                                         device->wakeup.gpe_number,
1357                                                 &event_status);
1358         if (status == AE_OK)
1359                 device->wakeup.flags.run_wake =
1360                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1361 }
1362
1363 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1364 {
1365         acpi_handle temp;
1366         acpi_status status = 0;
1367         int err;
1368
1369         /* Presence of _PRW indicates wake capable */
1370         status = acpi_get_handle(device->handle, "_PRW", &temp);
1371         if (ACPI_FAILURE(status))
1372                 return;
1373
1374         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1375                                                            &device->wakeup);
1376         if (err) {
1377                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1378                 return;
1379         }
1380
1381         device->wakeup.flags.valid = 1;
1382         device->wakeup.prepare_count = 0;
1383         acpi_bus_set_run_wake_flags(device);
1384         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1385          * system for the ACPI device with the _PRW object.
1386          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1387          * So it is necessary to call _DSW object first. Only when it is not
1388          * present will the _PSW object used.
1389          */
1390         err = acpi_device_sleep_wake(device, 0, 0, 0);
1391         if (err)
1392                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1393                                 "error in _DSW or _PSW evaluation\n"));
1394 }
1395
1396 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1397 {
1398         struct acpi_device_power_state *ps = &device->power.states[state];
1399         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1400         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1401         acpi_handle handle;
1402         acpi_status status;
1403
1404         INIT_LIST_HEAD(&ps->resources);
1405
1406         /* Evaluate "_PRx" to get referenced power resources */
1407         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1408         if (ACPI_SUCCESS(status)) {
1409                 union acpi_object *package = buffer.pointer;
1410
1411                 if (buffer.length && package
1412                     && package->type == ACPI_TYPE_PACKAGE
1413                     && package->package.count) {
1414                         int err = acpi_extract_power_resources(package, 0,
1415                                                                &ps->resources);
1416                         if (!err)
1417                                 device->power.flags.power_resources = 1;
1418                 }
1419                 ACPI_FREE(buffer.pointer);
1420         }
1421
1422         /* Evaluate "_PSx" to see if we can do explicit sets */
1423         pathname[2] = 'S';
1424         status = acpi_get_handle(device->handle, pathname, &handle);
1425         if (ACPI_SUCCESS(status))
1426                 ps->flags.explicit_set = 1;
1427
1428         /*
1429          * State is valid if there are means to put the device into it.
1430          * D3hot is only valid if _PR3 present.
1431          */
1432         if (!list_empty(&ps->resources)
1433             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1434                 ps->flags.valid = 1;
1435                 ps->flags.os_accessible = 1;
1436         }
1437
1438         ps->power = -1;         /* Unknown - driver assigned */
1439         ps->latency = -1;       /* Unknown - driver assigned */
1440 }
1441
1442 static void acpi_bus_get_power_flags(struct acpi_device *device)
1443 {
1444         acpi_status status;
1445         acpi_handle handle;
1446         u32 i;
1447
1448         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1449         status = acpi_get_handle(device->handle, "_PS0", &handle);
1450         if (ACPI_FAILURE(status)) {
1451                 status = acpi_get_handle(device->handle, "_PR0", &handle);
1452                 if (ACPI_FAILURE(status))
1453                         return;
1454         }
1455
1456         device->flags.power_manageable = 1;
1457
1458         /*
1459          * Power Management Flags
1460          */
1461         status = acpi_get_handle(device->handle, "_PSC", &handle);
1462         if (ACPI_SUCCESS(status))
1463                 device->power.flags.explicit_get = 1;
1464         status = acpi_get_handle(device->handle, "_IRC", &handle);
1465         if (ACPI_SUCCESS(status))
1466                 device->power.flags.inrush_current = 1;
1467
1468         /*
1469          * Enumerate supported power management states
1470          */
1471         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1472                 acpi_bus_init_power_state(device, i);
1473
1474         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1475
1476         /* Set defaults for D0 and D3 states (always valid) */
1477         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1478         device->power.states[ACPI_STATE_D0].power = 100;
1479         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1480         device->power.states[ACPI_STATE_D3].power = 0;
1481
1482         /* Set D3cold's explicit_set flag if _PS3 exists. */
1483         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1484                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1485
1486         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1487         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1488                         device->power.flags.power_resources)
1489                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1490
1491         if (acpi_bus_init_power(device)) {
1492                 acpi_free_power_resources_lists(device);
1493                 device->flags.power_manageable = 0;
1494         }
1495 }
1496
1497 static void acpi_bus_get_flags(struct acpi_device *device)
1498 {
1499         acpi_status status = AE_OK;
1500         acpi_handle temp = NULL;
1501
1502         /* Presence of _STA indicates 'dynamic_status' */
1503         status = acpi_get_handle(device->handle, "_STA", &temp);
1504         if (ACPI_SUCCESS(status))
1505                 device->flags.dynamic_status = 1;
1506
1507         /* Presence of _RMV indicates 'removable' */
1508         status = acpi_get_handle(device->handle, "_RMV", &temp);
1509         if (ACPI_SUCCESS(status))
1510                 device->flags.removable = 1;
1511
1512         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1513         status = acpi_get_handle(device->handle, "_EJD", &temp);
1514         if (ACPI_SUCCESS(status))
1515                 device->flags.ejectable = 1;
1516         else {
1517                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1518                 if (ACPI_SUCCESS(status))
1519                         device->flags.ejectable = 1;
1520         }
1521 }
1522
1523 static void acpi_device_get_busid(struct acpi_device *device)
1524 {
1525         char bus_id[5] = { '?', 0 };
1526         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1527         int i = 0;
1528
1529         /*
1530          * Bus ID
1531          * ------
1532          * The device's Bus ID is simply the object name.
1533          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1534          */
1535         if (ACPI_IS_ROOT_DEVICE(device)) {
1536                 strcpy(device->pnp.bus_id, "ACPI");
1537                 return;
1538         }
1539
1540         switch (device->device_type) {
1541         case ACPI_BUS_TYPE_POWER_BUTTON:
1542                 strcpy(device->pnp.bus_id, "PWRF");
1543                 break;
1544         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1545                 strcpy(device->pnp.bus_id, "SLPF");
1546                 break;
1547         default:
1548                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1549                 /* Clean up trailing underscores (if any) */
1550                 for (i = 3; i > 1; i--) {
1551                         if (bus_id[i] == '_')
1552                                 bus_id[i] = '\0';
1553                         else
1554                                 break;
1555                 }
1556                 strcpy(device->pnp.bus_id, bus_id);
1557                 break;
1558         }
1559 }
1560
1561 /*
1562  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1563  *
1564  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1565  * then we can safely call it an ejectable drive bay
1566  */
1567 static int acpi_bay_match(acpi_handle handle)
1568 {
1569         acpi_status status;
1570         acpi_handle tmp;
1571         acpi_handle phandle;
1572
1573         status = acpi_get_handle(handle, "_EJ0", &tmp);
1574         if (ACPI_FAILURE(status))
1575                 return -ENODEV;
1576
1577         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1578                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1579                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1580                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1581                 return 0;
1582
1583         if (acpi_get_parent(handle, &phandle))
1584                 return -ENODEV;
1585
1586         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1587                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1588                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1589                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1590                 return 0;
1591
1592         return -ENODEV;
1593 }
1594
1595 /*
1596  * acpi_dock_match - see if an acpi object has a _DCK method
1597  */
1598 static int acpi_dock_match(acpi_handle handle)
1599 {
1600         acpi_handle tmp;
1601         return acpi_get_handle(handle, "_DCK", &tmp);
1602 }
1603
1604 const char *acpi_device_hid(struct acpi_device *device)
1605 {
1606         struct acpi_hardware_id *hid;
1607
1608         if (list_empty(&device->pnp.ids))
1609                 return dummy_hid;
1610
1611         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1612         return hid->id;
1613 }
1614 EXPORT_SYMBOL(acpi_device_hid);
1615
1616 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1617 {
1618         struct acpi_hardware_id *id;
1619
1620         id = kmalloc(sizeof(*id), GFP_KERNEL);
1621         if (!id)
1622                 return;
1623
1624         id->id = kstrdup(dev_id, GFP_KERNEL);
1625         if (!id->id) {
1626                 kfree(id);
1627                 return;
1628         }
1629
1630         list_add_tail(&id->list, &pnp->ids);
1631         pnp->type.hardware_id = 1;
1632 }
1633
1634 /*
1635  * Old IBM workstations have a DSDT bug wherein the SMBus object
1636  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1637  * prefix.  Work around this.
1638  */
1639 static int acpi_ibm_smbus_match(acpi_handle handle)
1640 {
1641         acpi_handle h_dummy;
1642         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1643         int result;
1644
1645         if (!dmi_name_in_vendors("IBM"))
1646                 return -ENODEV;
1647
1648         /* Look for SMBS object */
1649         result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
1650         if (result)
1651                 return result;
1652
1653         if (strcmp("SMBS", path.pointer)) {
1654                 result = -ENODEV;
1655                 goto out;
1656         }
1657
1658         /* Does it have the necessary (but misnamed) methods? */
1659         result = -ENODEV;
1660         if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
1661             ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
1662             ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
1663                 result = 0;
1664 out:
1665         kfree(path.pointer);
1666         return result;
1667 }
1668
1669 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1670                                 int device_type)
1671 {
1672         acpi_status status;
1673         struct acpi_device_info *info;
1674         struct acpi_pnp_device_id_list *cid_list;
1675         int i;
1676
1677         switch (device_type) {
1678         case ACPI_BUS_TYPE_DEVICE:
1679                 if (handle == ACPI_ROOT_OBJECT) {
1680                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1681                         break;
1682                 }
1683
1684                 status = acpi_get_object_info(handle, &info);
1685                 if (ACPI_FAILURE(status)) {
1686                         pr_err(PREFIX "%s: Error reading device info\n",
1687                                         __func__);
1688                         return;
1689                 }
1690
1691                 if (info->valid & ACPI_VALID_HID)
1692                         acpi_add_id(pnp, info->hardware_id.string);
1693                 if (info->valid & ACPI_VALID_CID) {
1694                         cid_list = &info->compatible_id_list;
1695                         for (i = 0; i < cid_list->count; i++)
1696                                 acpi_add_id(pnp, cid_list->ids[i].string);
1697                 }
1698                 if (info->valid & ACPI_VALID_ADR) {
1699                         pnp->bus_address = info->address;
1700                         pnp->type.bus_address = 1;
1701                 }
1702                 if (info->valid & ACPI_VALID_UID)
1703                         pnp->unique_id = kstrdup(info->unique_id.string,
1704                                                         GFP_KERNEL);
1705
1706                 kfree(info);
1707
1708                 /*
1709                  * Some devices don't reliably have _HIDs & _CIDs, so add
1710                  * synthetic HIDs to make sure drivers can find them.
1711                  */
1712                 if (acpi_is_video_device(handle))
1713                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1714                 else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1715                         acpi_add_id(pnp, ACPI_BAY_HID);
1716                 else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1717                         acpi_add_id(pnp, ACPI_DOCK_HID);
1718                 else if (!acpi_ibm_smbus_match(handle))
1719                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1720                 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1721                         acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1722                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1723                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1724                 }
1725
1726                 break;
1727         case ACPI_BUS_TYPE_POWER:
1728                 acpi_add_id(pnp, ACPI_POWER_HID);
1729                 break;
1730         case ACPI_BUS_TYPE_PROCESSOR:
1731                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1732                 break;
1733         case ACPI_BUS_TYPE_THERMAL:
1734                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1735                 break;
1736         case ACPI_BUS_TYPE_POWER_BUTTON:
1737                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1738                 break;
1739         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1740                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1741                 break;
1742         }
1743 }
1744
1745 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1746 {
1747         struct acpi_hardware_id *id, *tmp;
1748
1749         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1750                 kfree(id->id);
1751                 kfree(id);
1752         }
1753         kfree(pnp->unique_id);
1754 }
1755
1756 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1757                              int type, unsigned long long sta)
1758 {
1759         INIT_LIST_HEAD(&device->pnp.ids);
1760         device->device_type = type;
1761         device->handle = handle;
1762         device->parent = acpi_bus_get_parent(handle);
1763         STRUCT_TO_INT(device->status) = sta;
1764         acpi_device_get_busid(device);
1765         acpi_set_pnp_ids(handle, &device->pnp, type);
1766         acpi_bus_get_flags(device);
1767         device->flags.match_driver = false;
1768         device_initialize(&device->dev);
1769         dev_set_uevent_suppress(&device->dev, true);
1770 }
1771
1772 void acpi_device_add_finalize(struct acpi_device *device)
1773 {
1774         device->flags.match_driver = true;
1775         dev_set_uevent_suppress(&device->dev, false);
1776         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1777 }
1778
1779 static int acpi_add_single_object(struct acpi_device **child,
1780                                   acpi_handle handle, int type,
1781                                   unsigned long long sta)
1782 {
1783         int result;
1784         struct acpi_device *device;
1785         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1786
1787         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1788         if (!device) {
1789                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1790                 return -ENOMEM;
1791         }
1792
1793         acpi_init_device_object(device, handle, type, sta);
1794         acpi_bus_get_power_flags(device);
1795         acpi_bus_get_wakeup_device_flags(device);
1796
1797         result = acpi_device_add(device, acpi_device_release);
1798         if (result) {
1799                 acpi_device_release(&device->dev);
1800                 return result;
1801         }
1802
1803         acpi_power_add_remove_device(device, true);
1804         acpi_device_add_finalize(device);
1805         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1806         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1807                 dev_name(&device->dev), (char *) buffer.pointer,
1808                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1809         kfree(buffer.pointer);
1810         *child = device;
1811         return 0;
1812 }
1813
1814 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1815                                     unsigned long long *sta)
1816 {
1817         acpi_status status;
1818         acpi_object_type acpi_type;
1819
1820         status = acpi_get_type(handle, &acpi_type);
1821         if (ACPI_FAILURE(status))
1822                 return -ENODEV;
1823
1824         switch (acpi_type) {
1825         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1826         case ACPI_TYPE_DEVICE:
1827                 *type = ACPI_BUS_TYPE_DEVICE;
1828                 status = acpi_bus_get_status_handle(handle, sta);
1829                 if (ACPI_FAILURE(status))
1830                         return -ENODEV;
1831                 break;
1832         case ACPI_TYPE_PROCESSOR:
1833                 *type = ACPI_BUS_TYPE_PROCESSOR;
1834                 status = acpi_bus_get_status_handle(handle, sta);
1835                 if (ACPI_FAILURE(status))
1836                         return -ENODEV;
1837                 break;
1838         case ACPI_TYPE_THERMAL:
1839                 *type = ACPI_BUS_TYPE_THERMAL;
1840                 *sta = ACPI_STA_DEFAULT;
1841                 break;
1842         case ACPI_TYPE_POWER:
1843                 *type = ACPI_BUS_TYPE_POWER;
1844                 *sta = ACPI_STA_DEFAULT;
1845                 break;
1846         default:
1847                 return -ENODEV;
1848         }
1849
1850         return 0;
1851 }
1852
1853 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1854                                        char *idstr,
1855                                        const struct acpi_device_id **matchid)
1856 {
1857         const struct acpi_device_id *devid;
1858
1859         for (devid = handler->ids; devid->id[0]; devid++)
1860                 if (!strcmp((char *)devid->id, idstr)) {
1861                         if (matchid)
1862                                 *matchid = devid;
1863
1864                         return true;
1865                 }
1866
1867         return false;
1868 }
1869
1870 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1871                                         const struct acpi_device_id **matchid)
1872 {
1873         struct acpi_scan_handler *handler;
1874
1875         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1876                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1877                         return handler;
1878
1879         return NULL;
1880 }
1881
1882 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1883 {
1884         if (!!hotplug->enabled == !!val)
1885                 return;
1886
1887         mutex_lock(&acpi_scan_lock);
1888
1889         hotplug->enabled = val;
1890
1891         mutex_unlock(&acpi_scan_lock);
1892 }
1893
1894 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1895 {
1896         struct acpi_device_pnp pnp = {};
1897         struct acpi_hardware_id *hwid;
1898         struct acpi_scan_handler *handler;
1899
1900         INIT_LIST_HEAD(&pnp.ids);
1901         acpi_set_pnp_ids(handle, &pnp, type);
1902
1903         if (!pnp.type.hardware_id)
1904                 return;
1905
1906         /*
1907          * This relies on the fact that acpi_install_notify_handler() will not
1908          * install the same notify handler routine twice for the same handle.
1909          */
1910         list_for_each_entry(hwid, &pnp.ids, list) {
1911                 handler = acpi_scan_match_handler(hwid->id, NULL);
1912                 if (handler) {
1913                         acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1914                                         acpi_hotplug_notify_cb, handler);
1915                         break;
1916                 }
1917         }
1918
1919         acpi_free_pnp_ids(&pnp);
1920 }
1921
1922 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1923                                       void *not_used, void **return_value)
1924 {
1925         struct acpi_device *device = NULL;
1926         int type;
1927         unsigned long long sta;
1928         acpi_status status;
1929         int result;
1930
1931         acpi_bus_get_device(handle, &device);
1932         if (device)
1933                 goto out;
1934
1935         result = acpi_bus_type_and_status(handle, &type, &sta);
1936         if (result)
1937                 return AE_OK;
1938
1939         if (type == ACPI_BUS_TYPE_POWER) {
1940                 acpi_add_power_resource(handle);
1941                 return AE_OK;
1942         }
1943
1944         acpi_scan_init_hotplug(handle, type);
1945
1946         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1947             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1948                 struct acpi_device_wakeup wakeup;
1949                 acpi_handle temp;
1950
1951                 status = acpi_get_handle(handle, "_PRW", &temp);
1952                 if (ACPI_SUCCESS(status)) {
1953                         acpi_bus_extract_wakeup_device_power_package(handle,
1954                                                                      &wakeup);
1955                         acpi_power_resources_list_free(&wakeup.resources);
1956                 }
1957                 return AE_CTRL_DEPTH;
1958         }
1959
1960         acpi_add_single_object(&device, handle, type, sta);
1961         if (!device)
1962                 return AE_CTRL_DEPTH;
1963
1964  out:
1965         if (!*return_value)
1966                 *return_value = device;
1967
1968         return AE_OK;
1969 }
1970
1971 static int acpi_scan_attach_handler(struct acpi_device *device)
1972 {
1973         struct acpi_hardware_id *hwid;
1974         int ret = 0;
1975
1976         list_for_each_entry(hwid, &device->pnp.ids, list) {
1977                 const struct acpi_device_id *devid;
1978                 struct acpi_scan_handler *handler;
1979
1980                 handler = acpi_scan_match_handler(hwid->id, &devid);
1981                 if (handler) {
1982                         ret = handler->attach(device, devid);
1983                         if (ret > 0) {
1984                                 device->handler = handler;
1985                                 break;
1986                         } else if (ret < 0) {
1987                                 break;
1988                         }
1989                 }
1990         }
1991         return ret;
1992 }
1993
1994 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1995                                           void *not_used, void **ret_not_used)
1996 {
1997         struct acpi_device *device;
1998         unsigned long long sta_not_used;
1999         int ret;
2000
2001         /*
2002          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
2003          * namespace walks prematurely.
2004          */
2005         if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
2006                 return AE_OK;
2007
2008         if (acpi_bus_get_device(handle, &device))
2009                 return AE_CTRL_DEPTH;
2010
2011         ret = acpi_scan_attach_handler(device);
2012         if (ret)
2013                 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
2014
2015         ret = device_attach(&device->dev);
2016         return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
2017 }
2018
2019 /**
2020  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2021  * @handle: Root of the namespace scope to scan.
2022  *
2023  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2024  * found devices.
2025  *
2026  * If no devices were found, -ENODEV is returned, but it does not mean that
2027  * there has been a real error.  There just have been no suitable ACPI objects
2028  * in the table trunk from which the kernel could create a device and add an
2029  * appropriate driver.
2030  *
2031  * Must be called under acpi_scan_lock.
2032  */
2033 int acpi_bus_scan(acpi_handle handle)
2034 {
2035         void *device = NULL;
2036         int error = 0;
2037
2038         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2039                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2040                                     acpi_bus_check_add, NULL, NULL, &device);
2041
2042         if (!device)
2043                 error = -ENODEV;
2044         else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
2045                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2046                                     acpi_bus_device_attach, NULL, NULL, NULL);
2047
2048         return error;
2049 }
2050 EXPORT_SYMBOL(acpi_bus_scan);
2051
2052 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
2053                                           void *not_used, void **ret_not_used)
2054 {
2055         struct acpi_device *device = NULL;
2056
2057         if (!acpi_bus_get_device(handle, &device)) {
2058                 struct acpi_scan_handler *dev_handler = device->handler;
2059
2060                 if (dev_handler) {
2061                         if (dev_handler->detach)
2062                                 dev_handler->detach(device);
2063
2064                         device->handler = NULL;
2065                 } else {
2066                         device_release_driver(&device->dev);
2067                 }
2068         }
2069         return AE_OK;
2070 }
2071
2072 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
2073                                    void *not_used, void **ret_not_used)
2074 {
2075         struct acpi_device *device = NULL;
2076
2077         if (!acpi_bus_get_device(handle, &device))
2078                 acpi_device_unregister(device);
2079
2080         return AE_OK;
2081 }
2082
2083 /**
2084  * acpi_bus_trim - Remove ACPI device node and all of its descendants
2085  * @start: Root of the ACPI device nodes subtree to remove.
2086  *
2087  * Must be called under acpi_scan_lock.
2088  */
2089 void acpi_bus_trim(struct acpi_device *start)
2090 {
2091         /*
2092          * Execute acpi_bus_device_detach() as a post-order callback to detach
2093          * all ACPI drivers from the device nodes being removed.
2094          */
2095         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2096                             acpi_bus_device_detach, NULL, NULL);
2097         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
2098         /*
2099          * Execute acpi_bus_remove() as a post-order callback to remove device
2100          * nodes in the given namespace scope.
2101          */
2102         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2103                             acpi_bus_remove, NULL, NULL);
2104         acpi_bus_remove(start->handle, 0, NULL, NULL);
2105 }
2106 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2107
2108 static int acpi_bus_scan_fixed(void)
2109 {
2110         int result = 0;
2111
2112         /*
2113          * Enumerate all fixed-feature devices.
2114          */
2115         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2116                 struct acpi_device *device = NULL;
2117
2118                 result = acpi_add_single_object(&device, NULL,
2119                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2120                                                 ACPI_STA_DEFAULT);
2121                 if (result)
2122                         return result;
2123
2124                 result = device_attach(&device->dev);
2125                 if (result < 0)
2126                         return result;
2127
2128                 device_init_wakeup(&device->dev, true);
2129         }
2130
2131         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2132                 struct acpi_device *device = NULL;
2133
2134                 result = acpi_add_single_object(&device, NULL,
2135                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2136                                                 ACPI_STA_DEFAULT);
2137                 if (result)
2138                         return result;
2139
2140                 result = device_attach(&device->dev);
2141         }
2142
2143         return result < 0 ? result : 0;
2144 }
2145
2146 int __init acpi_scan_init(void)
2147 {
2148         int result;
2149
2150         result = bus_register(&acpi_bus_type);
2151         if (result) {
2152                 /* We don't want to quit even if we failed to add suspend/resume */
2153                 printk(KERN_ERR PREFIX "Could not register bus type\n");
2154         }
2155
2156         acpi_pci_root_init();
2157         acpi_pci_link_init();
2158         acpi_processor_init();
2159         acpi_platform_init();
2160         acpi_lpss_init();
2161         acpi_csrt_init();
2162         acpi_container_init();
2163         acpi_memory_hotplug_init();
2164
2165         mutex_lock(&acpi_scan_lock);
2166         /*
2167          * Enumerate devices in the ACPI namespace.
2168          */
2169         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2170         if (result)
2171                 goto out;
2172
2173         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2174         if (result)
2175                 goto out;
2176
2177         result = acpi_bus_scan_fixed();
2178         if (result) {
2179                 acpi_device_unregister(acpi_root);
2180                 goto out;
2181         }
2182
2183         acpi_update_all_gpes();
2184
2185         acpi_pci_root_hp_init();
2186
2187  out:
2188         mutex_unlock(&acpi_scan_lock);
2189         return result;
2190 }