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         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                 ret = device_offline(pn->dev);
 145                 if (acpi_force_hot_remove)
 146                         continue;
 147
 148                 if (ret < 0) {
 149                         status = AE_ERROR;
 150                         break;
 151                 }
 152                 pn->put_online = !ret;
 153         }
 154
 155         mutex_unlock(&device->physical_node_lock);
 156
 157         return status;
 158 }
 159
 160 static acpi_status acpi_bus_online_companions(acpi_handle handle, u32 lvl,
 161                                               void *data, void **ret_p)
 162 {
 163         struct acpi_device *device = NULL;
 164         struct acpi_device_physical_node *pn;
 165
 166         if (acpi_bus_get_device(handle, &device))
 167                 return AE_OK;
 168
 169         mutex_lock(&device->physical_node_lock);
 170
 171         list_for_each_entry(pn, &device->physical_node_list, node)
 172                 if (pn->put_online) {
 173                         device_online(pn->dev);
 174                         pn->put_online = false;
 175                 }
 176
 177         mutex_unlock(&device->physical_node_lock);
 178
 179         return AE_OK;
 180 }
 181
 182 static int acpi_scan_hot_remove(struct acpi_device *device)
 183 {
 184         acpi_handle handle = device->handle;
 185         acpi_handle not_used;
 186         struct acpi_object_list arg_list;
 187         union acpi_object arg;
 188         acpi_status status;
 189         unsigned long long sta;
 190
 191         /* If there is no handle, the device node has been unregistered. */
 192         if (!handle) {
 193                 dev_dbg(&device->dev, "ACPI handle missing\n");
 194                 put_device(&device->dev);
 195                 return -EINVAL;
 196         }
 197
 198         lock_device_hotplug();
 199
 200         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 201                                      NULL, acpi_bus_offline_companions, NULL,
 202                                      NULL);
 203         if (ACPI_SUCCESS(status) || acpi_force_hot_remove)
 204                 status = acpi_bus_offline_companions(handle, 0, NULL, NULL);
 205
 206         if (ACPI_FAILURE(status) && !acpi_force_hot_remove) {
 207                 acpi_bus_online_companions(handle, 0, NULL, NULL);
 208                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 209                                     acpi_bus_online_companions, NULL, NULL,
 210                                     NULL);
 211
 212                 unlock_device_hotplug();
 213
 214                 put_device(&device->dev);
 215                 return -EBUSY;
 216         }
 217
 218         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 219                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 220
 221         acpi_bus_trim(device);
 222
 223         unlock_device_hotplug();
 224
 225         /* Device node has been unregistered. */
 226         put_device(&device->dev);
 227         device = NULL;
 228
 229         if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &not_used))) {
 230                 arg_list.count = 1;
 231                 arg_list.pointer = &arg;
 232                 arg.type = ACPI_TYPE_INTEGER;
 233                 arg.integer.value = 0;
 234                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 235         }
 236
 237         arg_list.count = 1;
 238         arg_list.pointer = &arg;
 239         arg.type = ACPI_TYPE_INTEGER;
 240         arg.integer.value = 1;
 241
 242         /*
 243          * TBD: _EJD support.
 244          */
 245         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 246         if (ACPI_FAILURE(status)) {
 247                 if (status == AE_NOT_FOUND) {
 248                         return -ENODEV;
 249                 } else {
 250                         acpi_handle_warn(handle, "Eject failed (0x%x)\n",
 251                                                                 status);
 252                         return -EIO;
 253                 }
 254         }
 255
 256         /*
 257          * Verify if eject was indeed successful.  If not, log an error
 258          * message.  No need to call _OST since _EJ0 call was made OK.
 259          */
 260         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 261         if (ACPI_FAILURE(status)) {
 262                 acpi_handle_warn(handle,
 263                         "Status check after eject failed (0x%x)\n", status);
 264         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 265                 acpi_handle_warn(handle,
 266                         "Eject incomplete - status 0x%llx\n", sta);
 267         }
 268
 269         return 0;
 270 }
 271
 272 static void acpi_bus_device_eject(void *context)
 273 {
 274         acpi_handle handle = context;
 275         struct acpi_device *device = NULL;
 276         struct acpi_scan_handler *handler;
 277         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 278
 279         mutex_lock(&acpi_scan_lock);
 280
 281         acpi_bus_get_device(handle, &device);
 282         if (!device)
 283                 goto err_out;
 284
 285         handler = device->handler;
 286         if (!handler || !handler->hotplug.enabled) {
 287                 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 288                 goto err_out;
 289         }
 290         acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
 291                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 292         if (handler->hotplug.mode == AHM_CONTAINER) {
 293                 device->flags.eject_pending = true;
 294                 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 295         } else {
 296                 int error;
 297
 298                 get_device(&device->dev);
 299                 error = acpi_scan_hot_remove(device);
 300                 if (error)
 301                         goto err_out;
 302         }
 303
 304  out:
 305         mutex_unlock(&acpi_scan_lock);
 306         return;
 307
 308  err_out:
 309         acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
 310                                   NULL);
 311         goto out;
 312 }
 313
 314 static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
 315 {
 316         struct acpi_device *device = NULL;
 317         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 318         int error;
 319
 320         mutex_lock(&acpi_scan_lock);
 321         lock_device_hotplug();
 322
 323         acpi_bus_get_device(handle, &device);
 324         if (device) {
 325                 dev_warn(&device->dev, "Attempt to re-insert\n");
 326                 goto out;
 327         }
 328         acpi_evaluate_hotplug_ost(handle, ost_source,
 329                                   ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
 330         error = acpi_bus_scan(handle);
 331         if (error) {
 332                 acpi_handle_warn(handle, "Namespace scan failure\n");
 333                 goto out;
 334         }
 335         error = acpi_bus_get_device(handle, &device);
 336         if (error) {
 337                 acpi_handle_warn(handle, "Missing device node object\n");
 338                 goto out;
 339         }
 340         ost_code = ACPI_OST_SC_SUCCESS;
 341         if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
 342                 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 343
 344  out:
 345         unlock_device_hotplug();
 346         acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
 347         mutex_unlock(&acpi_scan_lock);
 348 }
 349
 350 static void acpi_scan_bus_check(void *context)
 351 {
 352         acpi_scan_bus_device_check((acpi_handle)context,
 353                                    ACPI_NOTIFY_BUS_CHECK);
 354 }
 355
 356 static void acpi_scan_device_check(void *context)
 357 {
 358         acpi_scan_bus_device_check((acpi_handle)context,
 359                                    ACPI_NOTIFY_DEVICE_CHECK);
 360 }
 361
 362 static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
 363 {
 364         u32 ost_status;
 365
 366         switch (type) {
 367         case ACPI_NOTIFY_BUS_CHECK:
 368                 acpi_handle_debug(handle,
 369                         "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
 370                 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
 371                 break;
 372         case ACPI_NOTIFY_DEVICE_CHECK:
 373                 acpi_handle_debug(handle,
 374                         "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
 375                 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
 376                 break;
 377         case ACPI_NOTIFY_EJECT_REQUEST:
 378                 acpi_handle_debug(handle,
 379                         "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
 380                 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 381                 break;
 382         default:
 383                 /* non-hotplug event; possibly handled by other handler */
 384                 return;
 385         }
 386
 387         acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
 388 }
 389
 390 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
 391 {
 392         acpi_osd_exec_callback callback;
 393         struct acpi_scan_handler *handler = data;
 394         acpi_status status;
 395
 396         if (!handler->hotplug.enabled)
 397                 return acpi_hotplug_unsupported(handle, type);
 398
 399         switch (type) {
 400         case ACPI_NOTIFY_BUS_CHECK:
 401                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 402                 callback = acpi_scan_bus_check;
 403                 break;
 404         case ACPI_NOTIFY_DEVICE_CHECK:
 405                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 406                 callback = acpi_scan_device_check;
 407                 break;
 408         case ACPI_NOTIFY_EJECT_REQUEST:
 409                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 410                 callback = acpi_bus_device_eject;
 411                 break;
 412         default:
 413                 /* non-hotplug event; possibly handled by other handler */
 414                 return;
 415         }
 416         status = acpi_os_hotplug_execute(callback, handle);
 417         if (ACPI_FAILURE(status))
 418                 acpi_evaluate_hotplug_ost(handle, type,
 419                                           ACPI_OST_SC_NON_SPECIFIC_FAILURE,
 420                                           NULL);
 421 }
 422
 423 /**
 424  * acpi_bus_hot_remove_device: hot-remove a device and its children
 425  * @context: struct acpi_eject_event pointer (freed in this func)
 426  *
 427  * Hot-remove a device and its children. This function frees up the
 428  * memory space passed by arg context, so that the caller may call
 429  * this function asynchronously through acpi_os_hotplug_execute().
 430  */
 431 void acpi_bus_hot_remove_device(void *context)
 432 {
 433         struct acpi_eject_event *ej_event = context;
 434         struct acpi_device *device = ej_event->device;
 435         acpi_handle handle = device->handle;
 436         int error;
 437
 438         mutex_lock(&acpi_scan_lock);
 439
 440         error = acpi_scan_hot_remove(device);
 441         if (error && handle)
 442                 acpi_evaluate_hotplug_ost(handle, ej_event->event,
 443                                           ACPI_OST_SC_NON_SPECIFIC_FAILURE,
 444                                           NULL);
 445
 446         mutex_unlock(&acpi_scan_lock);
 447         kfree(context);
 448 }
 449 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 450
 451 static ssize_t real_power_state_show(struct device *dev,
 452                                      struct device_attribute *attr, char *buf)
 453 {
 454         struct acpi_device *adev = to_acpi_device(dev);
 455         int state;
 456         int ret;
 457
 458         ret = acpi_device_get_power(adev, &state);
 459         if (ret)
 460                 return ret;
 461
 462         return sprintf(buf, "%s\n", acpi_power_state_string(state));
 463 }
 464
 465 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 466
 467 static ssize_t power_state_show(struct device *dev,
 468                                 struct device_attribute *attr, char *buf)
 469 {
 470         struct acpi_device *adev = to_acpi_device(dev);
 471
 472         return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 473 }
 474
 475 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 476
 477 static ssize_t
 478 acpi_eject_store(struct device *d, struct device_attribute *attr,
 479                 const char *buf, size_t count)
 480 {
 481         struct acpi_device *acpi_device = to_acpi_device(d);
 482         struct acpi_eject_event *ej_event;
 483         acpi_object_type not_used;
 484         acpi_status status;
 485         u32 ost_source;
 486         int ret;
 487
 488         if (!count || buf[0] != '1')
 489                 return -EINVAL;
 490
 491         if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
 492             && !acpi_device->driver)
 493                 return -ENODEV;
 494
 495         status = acpi_get_type(acpi_device->handle, &not_used);
 496         if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
 497                 return -ENODEV;
 498
 499         mutex_lock(&acpi_scan_lock);
 500
 501         if (acpi_device->flags.eject_pending) {
 502                 /* ACPI eject notification event. */
 503                 ost_source = ACPI_NOTIFY_EJECT_REQUEST;
 504                 acpi_device->flags.eject_pending = 0;
 505         } else {
 506                 /* Eject initiated by user space. */
 507                 ost_source = ACPI_OST_EC_OSPM_EJECT;
 508         }
 509         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 510         if (!ej_event) {
 511                 ret = -ENOMEM;
 512                 goto err_out;
 513         }
 514         acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
 515                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 516         ej_event->device = acpi_device;
 517         ej_event->event = ost_source;
 518         get_device(&acpi_device->dev);
 519         status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
 520         if (ACPI_FAILURE(status)) {
 521                 put_device(&acpi_device->dev);
 522                 kfree(ej_event);
 523                 ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
 524                 goto err_out;
 525         }
 526         ret = count;
 527
 528  out:
 529         mutex_unlock(&acpi_scan_lock);
 530         return ret;
 531
 532  err_out:
 533         acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
 534                                   ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 535         goto out;
 536 }
 537
 538 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 539
 540 static ssize_t
 541 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 542         struct acpi_device *acpi_dev = to_acpi_device(dev);
 543
 544         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 545 }
 546 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 547
 548 static ssize_t acpi_device_uid_show(struct device *dev,
 549                                     struct device_attribute *attr, char *buf)
 550 {
 551         struct acpi_device *acpi_dev = to_acpi_device(dev);
 552
 553         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 554 }
 555 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 556
 557 static ssize_t acpi_device_adr_show(struct device *dev,
 558                                     struct device_attribute *attr, char *buf)
 559 {
 560         struct acpi_device *acpi_dev = to_acpi_device(dev);
 561
 562         return sprintf(buf, "0x%08x\n",
 563                        (unsigned int)(acpi_dev->pnp.bus_address));
 564 }
 565 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 566
 567 static ssize_t
 568 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 569         struct acpi_device *acpi_dev = to_acpi_device(dev);
 570         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 571         int result;
 572
 573         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 574         if (result)
 575                 goto end;
 576
 577         result = sprintf(buf, "%s\n", (char*)path.pointer);
 578         kfree(path.pointer);
 579 end:
 580         return result;
 581 }
 582 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 583
 584 /* sysfs file that shows description text from the ACPI _STR method */
 585 static ssize_t description_show(struct device *dev,
 586                                 struct device_attribute *attr,
 587                                 char *buf) {
 588         struct acpi_device *acpi_dev = to_acpi_device(dev);
 589         int result;
 590
 591         if (acpi_dev->pnp.str_obj == NULL)
 592                 return 0;
 593
 594         /*
 595          * The _STR object contains a Unicode identifier for a device.
 596          * We need to convert to utf-8 so it can be displayed.
 597          */
 598         result = utf16s_to_utf8s(
 599                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 600                 acpi_dev->pnp.str_obj->buffer.length,
 601                 UTF16_LITTLE_ENDIAN, buf,
 602                 PAGE_SIZE);
 603
 604         buf[result++] = '\n';
 605
 606         return result;
 607 }
 608 static DEVICE_ATTR(description, 0444, description_show, NULL);
 609
 610 static ssize_t
 611 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 612                      char *buf) {
 613         struct acpi_device *acpi_dev = to_acpi_device(dev);
 614
 615         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 616 }
 617 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 618
 619 static int acpi_device_setup_files(struct acpi_device *dev)
 620 {
 621         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 622         acpi_status status;
 623         acpi_handle temp;
 624         unsigned long long sun;
 625         int result = 0;
 626
 627         /*
 628          * Devices gotten from FADT don't have a "path" attribute
 629          */
 630         if (dev->handle) {
 631                 result = device_create_file(&dev->dev, &dev_attr_path);
 632                 if (result)
 633                         goto end;
 634         }
 635
 636         if (!list_empty(&dev->pnp.ids)) {
 637                 result = device_create_file(&dev->dev, &dev_attr_hid);
 638                 if (result)
 639                         goto end;
 640
 641                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 642                 if (result)
 643                         goto end;
 644         }
 645
 646         /*
 647          * If device has _STR, 'description' file is created
 648          */
 649         status = acpi_get_handle(dev->handle, "_STR", &temp);
 650         if (ACPI_SUCCESS(status)) {
 651                 status = acpi_evaluate_object(dev->handle, "_STR",
 652                                         NULL, &buffer);
 653                 if (ACPI_FAILURE(status))
 654                         buffer.pointer = NULL;
 655                 dev->pnp.str_obj = buffer.pointer;
 656                 result = device_create_file(&dev->dev, &dev_attr_description);
 657                 if (result)
 658                         goto end;
 659         }
 660
 661         if (dev->pnp.type.bus_address)
 662                 result = device_create_file(&dev->dev, &dev_attr_adr);
 663         if (dev->pnp.unique_id)
 664                 result = device_create_file(&dev->dev, &dev_attr_uid);
 665
 666         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 667         if (ACPI_SUCCESS(status)) {
 668                 dev->pnp.sun = (unsigned long)sun;
 669                 result = device_create_file(&dev->dev, &dev_attr_sun);
 670                 if (result)
 671                         goto end;
 672         } else {
 673                 dev->pnp.sun = (unsigned long)-1;
 674         }
 675
 676         /*
 677          * If device has _EJ0, 'eject' file is created that is used to trigger
 678          * hot-removal function from userland.
 679          */
 680         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 681         if (ACPI_SUCCESS(status)) {
 682                 result = device_create_file(&dev->dev, &dev_attr_eject);
 683                 if (result)
 684                         return result;
 685         }
 686
 687         if (dev->flags.power_manageable) {
 688                 result = device_create_file(&dev->dev, &dev_attr_power_state);
 689                 if (result)
 690                         return result;
 691
 692                 if (dev->power.flags.power_resources)
 693                         result = device_create_file(&dev->dev,
 694                                                     &dev_attr_real_power_state);
 695         }
 696
 697 end:
 698         return result;
 699 }
 700
 701 static void acpi_device_remove_files(struct acpi_device *dev)
 702 {
 703         acpi_status status;
 704         acpi_handle temp;
 705
 706         if (dev->flags.power_manageable) {
 707                 device_remove_file(&dev->dev, &dev_attr_power_state);
 708                 if (dev->power.flags.power_resources)
 709                         device_remove_file(&dev->dev,
 710                                            &dev_attr_real_power_state);
 711         }
 712
 713         /*
 714          * If device has _STR, remove 'description' file
 715          */
 716         status = acpi_get_handle(dev->handle, "_STR", &temp);
 717         if (ACPI_SUCCESS(status)) {
 718                 kfree(dev->pnp.str_obj);
 719                 device_remove_file(&dev->dev, &dev_attr_description);
 720         }
 721         /*
 722          * If device has _EJ0, remove 'eject' file.
 723          */
 724         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 725         if (ACPI_SUCCESS(status))
 726                 device_remove_file(&dev->dev, &dev_attr_eject);
 727
 728         status = acpi_get_handle(dev->handle, "_SUN", &temp);
 729         if (ACPI_SUCCESS(status))
 730                 device_remove_file(&dev->dev, &dev_attr_sun);
 731
 732         if (dev->pnp.unique_id)
 733                 device_remove_file(&dev->dev, &dev_attr_uid);
 734         if (dev->pnp.type.bus_address)
 735                 device_remove_file(&dev->dev, &dev_attr_adr);
 736         device_remove_file(&dev->dev, &dev_attr_modalias);
 737         device_remove_file(&dev->dev, &dev_attr_hid);
 738         if (dev->handle)
 739                 device_remove_file(&dev->dev, &dev_attr_path);
 740 }
 741 /* --------------------------------------------------------------------------
 742                         ACPI Bus operations
 743    -------------------------------------------------------------------------- */
 744
 745 static const struct acpi_device_id *__acpi_match_device(
 746         struct acpi_device *device, const struct acpi_device_id *ids)
 747 {
 748         const struct acpi_device_id *id;
 749         struct acpi_hardware_id *hwid;
 750
 751         /*
 752          * If the device is not present, it is unnecessary to load device
 753          * driver for it.
 754          */
 755         if (!device->status.present)
 756                 return NULL;
 757
 758         for (id = ids; id->id[0]; id++)
 759                 list_for_each_entry(hwid, &device->pnp.ids, list)
 760                         if (!strcmp((char *) id->id, hwid->id))
 761                                 return id;
 762
 763         return NULL;
 764 }
 765
 766 /**
 767  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 768  * @ids: Array of struct acpi_device_id object to match against.
 769  * @dev: The device structure to match.
 770  *
 771  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 772  * object for that handle and use that object to match against a given list of
 773  * device IDs.
 774  *
 775  * Return a pointer to the first matching ID on success or %NULL on failure.
 776  */
 777 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 778                                                const struct device *dev)
 779 {
 780         struct acpi_device *adev;
 781         acpi_handle handle = ACPI_HANDLE(dev);
 782
 783         if (!ids || !handle || acpi_bus_get_device(handle, &adev))
 784                 return NULL;
 785
 786         return __acpi_match_device(adev, ids);
 787 }
 788 EXPORT_SYMBOL_GPL(acpi_match_device);
 789
 790 int acpi_match_device_ids(struct acpi_device *device,
 791                           const struct acpi_device_id *ids)
 792 {
 793         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 794 }
 795 EXPORT_SYMBOL(acpi_match_device_ids);
 796
 797 static void acpi_free_power_resources_lists(struct acpi_device *device)
 798 {
 799         int i;
 800
 801         if (device->wakeup.flags.valid)
 802                 acpi_power_resources_list_free(&device->wakeup.resources);
 803
 804         if (!device->flags.power_manageable)
 805                 return;
 806
 807         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 808                 struct acpi_device_power_state *ps = &device->power.states[i];
 809                 acpi_power_resources_list_free(&ps->resources);
 810         }
 811 }
 812
 813 static void acpi_device_release(struct device *dev)
 814 {
 815         struct acpi_device *acpi_dev = to_acpi_device(dev);
 816
 817         acpi_free_pnp_ids(&acpi_dev->pnp);
 818         acpi_free_power_resources_lists(acpi_dev);
 819         kfree(acpi_dev);
 820 }
 821
 822 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 823 {
 824         struct acpi_device *acpi_dev = to_acpi_device(dev);
 825         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 826
 827         return acpi_dev->flags.match_driver
 828                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 829 }
 830
 831 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 832 {
 833         struct acpi_device *acpi_dev = to_acpi_device(dev);
 834         int len;
 835
 836         if (list_empty(&acpi_dev->pnp.ids))
 837                 return 0;
 838
 839         if (add_uevent_var(env, "MODALIAS="))
 840                 return -ENOMEM;
 841         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 842                               sizeof(env->buf) - env->buflen);
 843         if (len >= (sizeof(env->buf) - env->buflen))
 844                 return -ENOMEM;
 845         env->buflen += len;
 846         return 0;
 847 }
 848
 849 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 850 {
 851         struct acpi_device *device = data;
 852
 853         device->driver->ops.notify(device, event);
 854 }
 855
 856 static acpi_status acpi_device_notify_fixed(void *data)
 857 {
 858         struct acpi_device *device = data;
 859
 860         /* Fixed hardware devices have no handles */
 861         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 862         return AE_OK;
 863 }
 864
 865 static int acpi_device_install_notify_handler(struct acpi_device *device)
 866 {
 867         acpi_status status;
 868
 869         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 870                 status =
 871                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 872                                                      acpi_device_notify_fixed,
 873                                                      device);
 874         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 875                 status =
 876                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 877                                                      acpi_device_notify_fixed,
 878                                                      device);
 879         else
 880                 status = acpi_install_notify_handler(device->handle,
 881                                                      ACPI_DEVICE_NOTIFY,
 882                                                      acpi_device_notify,
 883                                                      device);
 884
 885         if (ACPI_FAILURE(status))
 886                 return -EINVAL;
 887         return 0;
 888 }
 889
 890 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 891 {
 892         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 893                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 894                                                 acpi_device_notify_fixed);
 895         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 896                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 897                                                 acpi_device_notify_fixed);
 898         else
 899                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 900                                            acpi_device_notify);
 901 }
 902
 903 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 904 static int acpi_device_probe(struct device * dev)
 905 {
 906         struct acpi_device *acpi_dev = to_acpi_device(dev);
 907         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 908         int ret;
 909
 910         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 911         if (!ret) {
 912                 if (acpi_drv->ops.notify) {
 913                         ret = acpi_device_install_notify_handler(acpi_dev);
 914                         if (ret) {
 915                                 if (acpi_drv->ops.remove)
 916                                         acpi_drv->ops.remove(acpi_dev);
 917                                 acpi_dev->driver = NULL;
 918                                 acpi_dev->driver_data = NULL;
 919                                 return ret;
 920                         }
 921                 }
 922
 923                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 924                         "Found driver [%s] for device [%s]\n",
 925                         acpi_drv->name, acpi_dev->pnp.bus_id));
 926                 get_device(dev);
 927         }
 928         return ret;
 929 }
 930
 931 static int acpi_device_remove(struct device * dev)
 932 {
 933         struct acpi_device *acpi_dev = to_acpi_device(dev);
 934         struct acpi_driver *acpi_drv = acpi_dev->driver;
 935
 936         if (acpi_drv) {
 937                 if (acpi_drv->ops.notify)
 938                         acpi_device_remove_notify_handler(acpi_dev);
 939                 if (acpi_drv->ops.remove)
 940                         acpi_drv->ops.remove(acpi_dev);
 941         }
 942         acpi_dev->driver = NULL;
 943         acpi_dev->driver_data = NULL;
 944
 945         put_device(dev);
 946         return 0;
 947 }
 948
 949 struct bus_type acpi_bus_type = {
 950         .name           = "acpi",
 951         .match          = acpi_bus_match,
 952         .probe          = acpi_device_probe,
 953         .remove         = acpi_device_remove,
 954         .uevent         = acpi_device_uevent,
 955 };
 956
 957 int acpi_device_add(struct acpi_device *device,
 958                     void (*release)(struct device *))
 959 {
 960         int result;
 961         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 962         int found = 0;
 963
 964         if (device->handle) {
 965                 acpi_status status;
 966
 967                 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
 968                                           device);
 969                 if (ACPI_FAILURE(status)) {
 970                         acpi_handle_err(device->handle,
 971                                         "Unable to attach device data\n");
 972                         return -ENODEV;
 973                 }
 974         }
 975
 976         /*
 977          * Linkage
 978          * -------
 979          * Link this device to its parent and siblings.
 980          */
 981         INIT_LIST_HEAD(&device->children);
 982         INIT_LIST_HEAD(&device->node);
 983         INIT_LIST_HEAD(&device->wakeup_list);
 984         INIT_LIST_HEAD(&device->physical_node_list);
 985         mutex_init(&device->physical_node_lock);
 986         INIT_LIST_HEAD(&device->power_dependent);
 987
 988         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 989         if (!new_bus_id) {
 990                 pr_err(PREFIX "Memory allocation error\n");
 991                 result = -ENOMEM;
 992                 goto err_detach;
 993         }
 994
 995         mutex_lock(&acpi_device_lock);
 996         /*
 997          * Find suitable bus_id and instance number in acpi_bus_id_list
 998          * If failed, create one and link it into acpi_bus_id_list
 999          */
1000         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1001                 if (!strcmp(acpi_device_bus_id->bus_id,
1002                             acpi_device_hid(device))) {
1003                         acpi_device_bus_id->instance_no++;
1004                         found = 1;
1005                         kfree(new_bus_id);
1006                         break;
1007                 }
1008         }
1009         if (!found) {
1010                 acpi_device_bus_id = new_bus_id;
1011                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1012                 acpi_device_bus_id->instance_no = 0;
1013                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1014         }
1015         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1016
1017         if (device->parent)
1018                 list_add_tail(&device->node, &device->parent->children);
1019
1020         if (device->wakeup.flags.valid)
1021                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1022         mutex_unlock(&acpi_device_lock);
1023
1024         if (device->parent)
1025                 device->dev.parent = &device->parent->dev;
1026         device->dev.bus = &acpi_bus_type;
1027         device->dev.release = release;
1028         result = device_add(&device->dev);
1029         if (result) {
1030                 dev_err(&device->dev, "Error registering device\n");
1031                 goto err;
1032         }
1033
1034         result = acpi_device_setup_files(device);
1035         if (result)
1036                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1037                        dev_name(&device->dev));
1038
1039         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
1040         return 0;
1041
1042  err:
1043         mutex_lock(&acpi_device_lock);
1044         if (device->parent)
1045                 list_del(&device->node);
1046         list_del(&device->wakeup_list);
1047         mutex_unlock(&acpi_device_lock);
1048
1049  err_detach:
1050         acpi_detach_data(device->handle, acpi_bus_data_handler);
1051         return result;
1052 }
1053
1054 static void acpi_device_unregister(struct acpi_device *device)
1055 {
1056         mutex_lock(&acpi_device_lock);
1057         if (device->parent)
1058                 list_del(&device->node);
1059
1060         list_del(&device->wakeup_list);
1061         mutex_unlock(&acpi_device_lock);
1062
1063         acpi_detach_data(device->handle, acpi_bus_data_handler);
1064
1065         acpi_power_add_remove_device(device, false);
1066         acpi_device_remove_files(device);
1067         if (device->remove)
1068                 device->remove(device);
1069
1070         device_del(&device->dev);
1071         /*
1072          * Transition the device to D3cold to drop the reference counts of all
1073          * power resources the device depends on and turn off the ones that have
1074          * no more references.
1075          */
1076         acpi_device_set_power(device, ACPI_STATE_D3_COLD);
1077         device->handle = NULL;
1078         put_device(&device->dev);
1079 }
1080
1081 /* --------------------------------------------------------------------------
1082                                  Driver Management
1083    -------------------------------------------------------------------------- */
1084 /**
1085  * acpi_bus_driver_init - add a device to a driver
1086  * @device: the device to add and initialize
1087  * @driver: driver for the device
1088  *
1089  * Used to initialize a device via its device driver.  Called whenever a
1090  * driver is bound to a device.  Invokes the driver's add() ops.
1091  */
1092 static int
1093 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
1094 {
1095         int result = 0;
1096
1097         if (!device || !driver)
1098                 return -EINVAL;
1099
1100         if (!driver->ops.add)
1101                 return -ENOSYS;
1102
1103         result = driver->ops.add(device);
1104         if (result) {
1105                 device->driver = NULL;
1106                 device->driver_data = NULL;
1107                 return result;
1108         }
1109
1110         device->driver = driver;
1111
1112         /*
1113          * TBD - Configuration Management: Assign resources to device based
1114          * upon possible configuration and currently allocated resources.
1115          */
1116
1117         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1118                           "Driver successfully bound to device\n"));
1119         return 0;
1120 }
1121
1122 /**
1123  * acpi_bus_register_driver - register a driver with the ACPI bus
1124  * @driver: driver being registered
1125  *
1126  * Registers a driver with the ACPI bus.  Searches the namespace for all
1127  * devices that match the driver's criteria and binds.  Returns zero for
1128  * success or a negative error status for failure.
1129  */
1130 int acpi_bus_register_driver(struct acpi_driver *driver)
1131 {
1132         int ret;
1133
1134         if (acpi_disabled)
1135                 return -ENODEV;
1136         driver->drv.name = driver->name;
1137         driver->drv.bus = &acpi_bus_type;
1138         driver->drv.owner = driver->owner;
1139
1140         ret = driver_register(&driver->drv);
1141         return ret;
1142 }
1143
1144 EXPORT_SYMBOL(acpi_bus_register_driver);
1145
1146 /**
1147  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1148  * @driver: driver to unregister
1149  *
1150  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
1151  * devices that match the driver's criteria and unbinds.
1152  */
1153 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1154 {
1155         driver_unregister(&driver->drv);
1156 }
1157
1158 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1159
1160 /* --------------------------------------------------------------------------
1161                                  Device Enumeration
1162    -------------------------------------------------------------------------- */
1163 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1164 {
1165         struct acpi_device *device = NULL;
1166         acpi_status status;
1167
1168         /*
1169          * Fixed hardware devices do not appear in the namespace and do not
1170          * have handles, but we fabricate acpi_devices for them, so we have
1171          * to deal with them specially.
1172          */
1173         if (!handle)
1174                 return acpi_root;
1175
1176         do {
1177                 status = acpi_get_parent(handle, &handle);
1178                 if (ACPI_FAILURE(status))
1179                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
1180         } while (acpi_bus_get_device(handle, &device));
1181         return device;
1182 }
1183
1184 acpi_status
1185 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1186 {
1187         acpi_status status;
1188         acpi_handle tmp;
1189         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1190         union acpi_object *obj;
1191
1192         status = acpi_get_handle(handle, "_EJD", &tmp);
1193         if (ACPI_FAILURE(status))
1194                 return status;
1195
1196         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1197         if (ACPI_SUCCESS(status)) {
1198                 obj = buffer.pointer;
1199                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1200                                          ejd);
1201                 kfree(buffer.pointer);
1202         }
1203         return status;
1204 }
1205 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1206
1207 void acpi_bus_data_handler(acpi_handle handle, void *context)
1208 {
1209
1210         /* TBD */
1211
1212         return;
1213 }
1214
1215 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1216                                         struct acpi_device_wakeup *wakeup)
1217 {
1218         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1219         union acpi_object *package = NULL;
1220         union acpi_object *element = NULL;
1221         acpi_status status;
1222         int err = -ENODATA;
1223
1224         if (!wakeup)
1225                 return -EINVAL;
1226
1227         INIT_LIST_HEAD(&wakeup->resources);
1228
1229         /* _PRW */
1230         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1231         if (ACPI_FAILURE(status)) {
1232                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1233                 return err;
1234         }
1235
1236         package = (union acpi_object *)buffer.pointer;
1237
1238         if (!package || package->package.count < 2)
1239                 goto out;
1240
1241         element = &(package->package.elements[0]);
1242         if (!element)
1243                 goto out;
1244
1245         if (element->type == ACPI_TYPE_PACKAGE) {
1246                 if ((element->package.count < 2) ||
1247                     (element->package.elements[0].type !=
1248                      ACPI_TYPE_LOCAL_REFERENCE)
1249                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1250                         goto out;
1251
1252                 wakeup->gpe_device =
1253                     element->package.elements[0].reference.handle;
1254                 wakeup->gpe_number =
1255                     (u32) element->package.elements[1].integer.value;
1256         } else if (element->type == ACPI_TYPE_INTEGER) {
1257                 wakeup->gpe_device = NULL;
1258                 wakeup->gpe_number = element->integer.value;
1259         } else {
1260                 goto out;
1261         }
1262
1263         element = &(package->package.elements[1]);
1264         if (element->type != ACPI_TYPE_INTEGER)
1265                 goto out;
1266
1267         wakeup->sleep_state = element->integer.value;
1268
1269         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1270         if (err)
1271                 goto out;
1272
1273         if (!list_empty(&wakeup->resources)) {
1274                 int sleep_state;
1275
1276                 err = acpi_power_wakeup_list_init(&wakeup->resources,
1277                                                   &sleep_state);
1278                 if (err) {
1279                         acpi_handle_warn(handle, "Retrieving current states "
1280                                          "of wakeup power resources failed\n");
1281                         acpi_power_resources_list_free(&wakeup->resources);
1282                         goto out;
1283                 }
1284                 if (sleep_state < wakeup->sleep_state) {
1285                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
1286                                          "(S%d) by S%d from power resources\n",
1287                                          (int)wakeup->sleep_state, sleep_state);
1288                         wakeup->sleep_state = sleep_state;
1289                 }
1290         }
1291         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1292
1293  out:
1294         kfree(buffer.pointer);
1295         return err;
1296 }
1297
1298 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1299 {
1300         struct acpi_device_id button_device_ids[] = {
1301                 {"PNP0C0C", 0},
1302                 {"PNP0C0D", 0},
1303                 {"PNP0C0E", 0},
1304                 {"", 0},
1305         };
1306         acpi_status status;
1307         acpi_event_status event_status;
1308
1309         device->wakeup.flags.notifier_present = 0;
1310
1311         /* Power button, Lid switch always enable wakeup */
1312         if (!acpi_match_device_ids(device, button_device_ids)) {
1313                 device->wakeup.flags.run_wake = 1;
1314                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1315                         /* Do not use Lid/sleep button for S5 wakeup */
1316                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
1317                                 device->wakeup.sleep_state = ACPI_STATE_S4;
1318                 }
1319                 device_set_wakeup_capable(&device->dev, true);
1320                 return;
1321         }
1322
1323         status = acpi_get_gpe_status(device->wakeup.gpe_device,
1324                                         device->wakeup.gpe_number,
1325                                                 &event_status);
1326         if (status == AE_OK)
1327                 device->wakeup.flags.run_wake =
1328                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1329 }
1330
1331 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1332 {
1333         acpi_handle temp;
1334         acpi_status status = 0;
1335         int err;
1336
1337         /* Presence of _PRW indicates wake capable */
1338         status = acpi_get_handle(device->handle, "_PRW", &temp);
1339         if (ACPI_FAILURE(status))
1340                 return;
1341
1342         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1343                                                            &device->wakeup);
1344         if (err) {
1345                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1346                 return;
1347         }
1348
1349         device->wakeup.flags.valid = 1;
1350         device->wakeup.prepare_count = 0;
1351         acpi_bus_set_run_wake_flags(device);
1352         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1353          * system for the ACPI device with the _PRW object.
1354          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1355          * So it is necessary to call _DSW object first. Only when it is not
1356          * present will the _PSW object used.
1357          */
1358         err = acpi_device_sleep_wake(device, 0, 0, 0);
1359         if (err)
1360                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1361                                 "error in _DSW or _PSW evaluation\n"));
1362 }
1363
1364 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1365 {
1366         struct acpi_device_power_state *ps = &device->power.states[state];
1367         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1368         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1369         acpi_handle handle;
1370         acpi_status status;
1371
1372         INIT_LIST_HEAD(&ps->resources);
1373
1374         /* Evaluate "_PRx" to get referenced power resources */
1375         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1376         if (ACPI_SUCCESS(status)) {
1377                 union acpi_object *package = buffer.pointer;
1378
1379                 if (buffer.length && package
1380                     && package->type == ACPI_TYPE_PACKAGE
1381                     && package->package.count) {
1382                         int err = acpi_extract_power_resources(package, 0,
1383                                                                &ps->resources);
1384                         if (!err)
1385                                 device->power.flags.power_resources = 1;
1386                 }
1387                 ACPI_FREE(buffer.pointer);
1388         }
1389
1390         /* Evaluate "_PSx" to see if we can do explicit sets */
1391         pathname[2] = 'S';
1392         status = acpi_get_handle(device->handle, pathname, &handle);
1393         if (ACPI_SUCCESS(status))
1394                 ps->flags.explicit_set = 1;
1395
1396         /*
1397          * State is valid if there are means to put the device into it.
1398          * D3hot is only valid if _PR3 present.
1399          */
1400         if (!list_empty(&ps->resources)
1401             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1402                 ps->flags.valid = 1;
1403                 ps->flags.os_accessible = 1;
1404         }
1405
1406         ps->power = -1;         /* Unknown - driver assigned */
1407         ps->latency = -1;       /* Unknown - driver assigned */
1408 }
1409
1410 static void acpi_bus_get_power_flags(struct acpi_device *device)
1411 {
1412         acpi_status status;
1413         acpi_handle handle;
1414         u32 i;
1415
1416         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1417         status = acpi_get_handle(device->handle, "_PS0", &handle);
1418         if (ACPI_FAILURE(status)) {
1419                 status = acpi_get_handle(device->handle, "_PR0", &handle);
1420                 if (ACPI_FAILURE(status))
1421                         return;
1422         }
1423
1424         device->flags.power_manageable = 1;
1425
1426         /*
1427          * Power Management Flags
1428          */
1429         status = acpi_get_handle(device->handle, "_PSC", &handle);
1430         if (ACPI_SUCCESS(status))
1431                 device->power.flags.explicit_get = 1;
1432         status = acpi_get_handle(device->handle, "_IRC", &handle);
1433         if (ACPI_SUCCESS(status))
1434                 device->power.flags.inrush_current = 1;
1435
1436         /*
1437          * Enumerate supported power management states
1438          */
1439         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1440                 acpi_bus_init_power_state(device, i);
1441
1442         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1443
1444         /* Set defaults for D0 and D3 states (always valid) */
1445         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1446         device->power.states[ACPI_STATE_D0].power = 100;
1447         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1448         device->power.states[ACPI_STATE_D3].power = 0;
1449
1450         /* Set D3cold's explicit_set flag if _PS3 exists. */
1451         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1452                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1453
1454         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1455         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1456                         device->power.flags.power_resources)
1457                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1458
1459         if (acpi_bus_init_power(device)) {
1460                 acpi_free_power_resources_lists(device);
1461                 device->flags.power_manageable = 0;
1462         }
1463 }
1464
1465 static void acpi_bus_get_flags(struct acpi_device *device)
1466 {
1467         acpi_status status = AE_OK;
1468         acpi_handle temp = NULL;
1469
1470         /* Presence of _STA indicates 'dynamic_status' */
1471         status = acpi_get_handle(device->handle, "_STA", &temp);
1472         if (ACPI_SUCCESS(status))
1473                 device->flags.dynamic_status = 1;
1474
1475         /* Presence of _RMV indicates 'removable' */
1476         status = acpi_get_handle(device->handle, "_RMV", &temp);
1477         if (ACPI_SUCCESS(status))
1478                 device->flags.removable = 1;
1479
1480         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1481         status = acpi_get_handle(device->handle, "_EJD", &temp);
1482         if (ACPI_SUCCESS(status))
1483                 device->flags.ejectable = 1;
1484         else {
1485                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1486                 if (ACPI_SUCCESS(status))
1487                         device->flags.ejectable = 1;
1488         }
1489 }
1490
1491 static void acpi_device_get_busid(struct acpi_device *device)
1492 {
1493         char bus_id[5] = { '?', 0 };
1494         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1495         int i = 0;
1496
1497         /*
1498          * Bus ID
1499          * ------
1500          * The device's Bus ID is simply the object name.
1501          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1502          */
1503         if (ACPI_IS_ROOT_DEVICE(device)) {
1504                 strcpy(device->pnp.bus_id, "ACPI");
1505                 return;
1506         }
1507
1508         switch (device->device_type) {
1509         case ACPI_BUS_TYPE_POWER_BUTTON:
1510                 strcpy(device->pnp.bus_id, "PWRF");
1511                 break;
1512         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1513                 strcpy(device->pnp.bus_id, "SLPF");
1514                 break;
1515         default:
1516                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1517                 /* Clean up trailing underscores (if any) */
1518                 for (i = 3; i > 1; i--) {
1519                         if (bus_id[i] == '_')
1520                                 bus_id[i] = '\0';
1521                         else
1522                                 break;
1523                 }
1524                 strcpy(device->pnp.bus_id, bus_id);
1525                 break;
1526         }
1527 }
1528
1529 /*
1530  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1531  *
1532  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1533  * then we can safely call it an ejectable drive bay
1534  */
1535 static int acpi_bay_match(acpi_handle handle)
1536 {
1537         acpi_status status;
1538         acpi_handle tmp;
1539         acpi_handle phandle;
1540
1541         status = acpi_get_handle(handle, "_EJ0", &tmp);
1542         if (ACPI_FAILURE(status))
1543                 return -ENODEV;
1544
1545         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1546                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1547                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1548                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1549                 return 0;
1550
1551         if (acpi_get_parent(handle, &phandle))
1552                 return -ENODEV;
1553
1554         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1555                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1556                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1557                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1558                 return 0;
1559
1560         return -ENODEV;
1561 }
1562
1563 /*
1564  * acpi_dock_match - see if an acpi object has a _DCK method
1565  */
1566 static int acpi_dock_match(acpi_handle handle)
1567 {
1568         acpi_handle tmp;
1569         return acpi_get_handle(handle, "_DCK", &tmp);
1570 }
1571
1572 const char *acpi_device_hid(struct acpi_device *device)
1573 {
1574         struct acpi_hardware_id *hid;
1575
1576         if (list_empty(&device->pnp.ids))
1577                 return dummy_hid;
1578
1579         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1580         return hid->id;
1581 }
1582 EXPORT_SYMBOL(acpi_device_hid);
1583
1584 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1585 {
1586         struct acpi_hardware_id *id;
1587
1588         id = kmalloc(sizeof(*id), GFP_KERNEL);
1589         if (!id)
1590                 return;
1591
1592         id->id = kstrdup(dev_id, GFP_KERNEL);
1593         if (!id->id) {
1594                 kfree(id);
1595                 return;
1596         }
1597
1598         list_add_tail(&id->list, &pnp->ids);
1599         pnp->type.hardware_id = 1;
1600 }
1601
1602 /*
1603  * Old IBM workstations have a DSDT bug wherein the SMBus object
1604  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1605  * prefix.  Work around this.
1606  */
1607 static int acpi_ibm_smbus_match(acpi_handle handle)
1608 {
1609         acpi_handle h_dummy;
1610         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1611         int result;
1612
1613         if (!dmi_name_in_vendors("IBM"))
1614                 return -ENODEV;
1615
1616         /* Look for SMBS object */
1617         result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
1618         if (result)
1619                 return result;
1620
1621         if (strcmp("SMBS", path.pointer)) {
1622                 result = -ENODEV;
1623                 goto out;
1624         }
1625
1626         /* Does it have the necessary (but misnamed) methods? */
1627         result = -ENODEV;
1628         if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
1629             ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
1630             ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
1631                 result = 0;
1632 out:
1633         kfree(path.pointer);
1634         return result;
1635 }
1636
1637 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1638                                 int device_type)
1639 {
1640         acpi_status status;
1641         struct acpi_device_info *info;
1642         struct acpi_pnp_device_id_list *cid_list;
1643         int i;
1644
1645         switch (device_type) {
1646         case ACPI_BUS_TYPE_DEVICE:
1647                 if (handle == ACPI_ROOT_OBJECT) {
1648                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1649                         break;
1650                 }
1651
1652                 status = acpi_get_object_info(handle, &info);
1653                 if (ACPI_FAILURE(status)) {
1654                         pr_err(PREFIX "%s: Error reading device info\n",
1655                                         __func__);
1656                         return;
1657                 }
1658
1659                 if (info->valid & ACPI_VALID_HID)
1660                         acpi_add_id(pnp, info->hardware_id.string);
1661                 if (info->valid & ACPI_VALID_CID) {
1662                         cid_list = &info->compatible_id_list;
1663                         for (i = 0; i < cid_list->count; i++)
1664                                 acpi_add_id(pnp, cid_list->ids[i].string);
1665                 }
1666                 if (info->valid & ACPI_VALID_ADR) {
1667                         pnp->bus_address = info->address;
1668                         pnp->type.bus_address = 1;
1669                 }
1670                 if (info->valid & ACPI_VALID_UID)
1671                         pnp->unique_id = kstrdup(info->unique_id.string,
1672                                                         GFP_KERNEL);
1673
1674                 kfree(info);
1675
1676                 /*
1677                  * Some devices don't reliably have _HIDs & _CIDs, so add
1678                  * synthetic HIDs to make sure drivers can find them.
1679                  */
1680                 if (acpi_is_video_device(handle))
1681                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1682                 else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1683                         acpi_add_id(pnp, ACPI_BAY_HID);
1684                 else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1685                         acpi_add_id(pnp, ACPI_DOCK_HID);
1686                 else if (!acpi_ibm_smbus_match(handle))
1687                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1688                 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1689                         acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1690                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1691                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1692                 }
1693
1694                 break;
1695         case ACPI_BUS_TYPE_POWER:
1696                 acpi_add_id(pnp, ACPI_POWER_HID);
1697                 break;
1698         case ACPI_BUS_TYPE_PROCESSOR:
1699                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1700                 break;
1701         case ACPI_BUS_TYPE_THERMAL:
1702                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1703                 break;
1704         case ACPI_BUS_TYPE_POWER_BUTTON:
1705                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1706                 break;
1707         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1708                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1709                 break;
1710         }
1711 }
1712
1713 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1714 {
1715         struct acpi_hardware_id *id, *tmp;
1716
1717         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1718                 kfree(id->id);
1719                 kfree(id);
1720         }
1721         kfree(pnp->unique_id);
1722 }
1723
1724 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1725                              int type, unsigned long long sta)
1726 {
1727         INIT_LIST_HEAD(&device->pnp.ids);
1728         device->device_type = type;
1729         device->handle = handle;
1730         device->parent = acpi_bus_get_parent(handle);
1731         STRUCT_TO_INT(device->status) = sta;
1732         acpi_device_get_busid(device);
1733         acpi_set_pnp_ids(handle, &device->pnp, type);
1734         acpi_bus_get_flags(device);
1735         device->flags.match_driver = false;
1736         device_initialize(&device->dev);
1737         dev_set_uevent_suppress(&device->dev, true);
1738 }
1739
1740 void acpi_device_add_finalize(struct acpi_device *device)
1741 {
1742         device->flags.match_driver = true;
1743         dev_set_uevent_suppress(&device->dev, false);
1744         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1745 }
1746
1747 static int acpi_add_single_object(struct acpi_device **child,
1748                                   acpi_handle handle, int type,
1749                                   unsigned long long sta)
1750 {
1751         int result;
1752         struct acpi_device *device;
1753         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1754
1755         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1756         if (!device) {
1757                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1758                 return -ENOMEM;
1759         }
1760
1761         acpi_init_device_object(device, handle, type, sta);
1762         acpi_bus_get_power_flags(device);
1763         acpi_bus_get_wakeup_device_flags(device);
1764
1765         result = acpi_device_add(device, acpi_device_release);
1766         if (result) {
1767                 acpi_device_release(&device->dev);
1768                 return result;
1769         }
1770
1771         acpi_power_add_remove_device(device, true);
1772         acpi_device_add_finalize(device);
1773         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1774         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1775                 dev_name(&device->dev), (char *) buffer.pointer,
1776                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1777         kfree(buffer.pointer);
1778         *child = device;
1779         return 0;
1780 }
1781
1782 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1783                                     unsigned long long *sta)
1784 {
1785         acpi_status status;
1786         acpi_object_type acpi_type;
1787
1788         status = acpi_get_type(handle, &acpi_type);
1789         if (ACPI_FAILURE(status))
1790                 return -ENODEV;
1791
1792         switch (acpi_type) {
1793         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1794         case ACPI_TYPE_DEVICE:
1795                 *type = ACPI_BUS_TYPE_DEVICE;
1796                 status = acpi_bus_get_status_handle(handle, sta);
1797                 if (ACPI_FAILURE(status))
1798                         return -ENODEV;
1799                 break;
1800         case ACPI_TYPE_PROCESSOR:
1801                 *type = ACPI_BUS_TYPE_PROCESSOR;
1802                 status = acpi_bus_get_status_handle(handle, sta);
1803                 if (ACPI_FAILURE(status))
1804                         return -ENODEV;
1805                 break;
1806         case ACPI_TYPE_THERMAL:
1807                 *type = ACPI_BUS_TYPE_THERMAL;
1808                 *sta = ACPI_STA_DEFAULT;
1809                 break;
1810         case ACPI_TYPE_POWER:
1811                 *type = ACPI_BUS_TYPE_POWER;
1812                 *sta = ACPI_STA_DEFAULT;
1813                 break;
1814         default:
1815                 return -ENODEV;
1816         }
1817
1818         return 0;
1819 }
1820
1821 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1822                                        char *idstr,
1823                                        const struct acpi_device_id **matchid)
1824 {
1825         const struct acpi_device_id *devid;
1826
1827         for (devid = handler->ids; devid->id[0]; devid++)
1828                 if (!strcmp((char *)devid->id, idstr)) {
1829                         if (matchid)
1830                                 *matchid = devid;
1831
1832                         return true;
1833                 }
1834
1835         return false;
1836 }
1837
1838 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1839                                         const struct acpi_device_id **matchid)
1840 {
1841         struct acpi_scan_handler *handler;
1842
1843         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1844                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1845                         return handler;
1846
1847         return NULL;
1848 }
1849
1850 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1851 {
1852         if (!!hotplug->enabled == !!val)
1853                 return;
1854
1855         mutex_lock(&acpi_scan_lock);
1856
1857         hotplug->enabled = val;
1858
1859         mutex_unlock(&acpi_scan_lock);
1860 }
1861
1862 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1863 {
1864         struct acpi_device_pnp pnp = {};
1865         struct acpi_hardware_id *hwid;
1866         struct acpi_scan_handler *handler;
1867
1868         INIT_LIST_HEAD(&pnp.ids);
1869         acpi_set_pnp_ids(handle, &pnp, type);
1870
1871         if (!pnp.type.hardware_id)
1872                 return;
1873
1874         /*
1875          * This relies on the fact that acpi_install_notify_handler() will not
1876          * install the same notify handler routine twice for the same handle.
1877          */
1878         list_for_each_entry(hwid, &pnp.ids, list) {
1879                 handler = acpi_scan_match_handler(hwid->id, NULL);
1880                 if (handler) {
1881                         acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1882                                         acpi_hotplug_notify_cb, handler);
1883                         break;
1884                 }
1885         }
1886
1887         acpi_free_pnp_ids(&pnp);
1888 }
1889
1890 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1891                                       void *not_used, void **return_value)
1892 {
1893         struct acpi_device *device = NULL;
1894         int type;
1895         unsigned long long sta;
1896         acpi_status status;
1897         int result;
1898
1899         acpi_bus_get_device(handle, &device);
1900         if (device)
1901                 goto out;
1902
1903         result = acpi_bus_type_and_status(handle, &type, &sta);
1904         if (result)
1905                 return AE_OK;
1906
1907         if (type == ACPI_BUS_TYPE_POWER) {
1908                 acpi_add_power_resource(handle);
1909                 return AE_OK;
1910         }
1911
1912         acpi_scan_init_hotplug(handle, type);
1913
1914         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1915             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1916                 struct acpi_device_wakeup wakeup;
1917                 acpi_handle temp;
1918
1919                 status = acpi_get_handle(handle, "_PRW", &temp);
1920                 if (ACPI_SUCCESS(status)) {
1921                         acpi_bus_extract_wakeup_device_power_package(handle,
1922                                                                      &wakeup);
1923                         acpi_power_resources_list_free(&wakeup.resources);
1924                 }
1925                 return AE_CTRL_DEPTH;
1926         }
1927
1928         acpi_add_single_object(&device, handle, type, sta);
1929         if (!device)
1930                 return AE_CTRL_DEPTH;
1931
1932  out:
1933         if (!*return_value)
1934                 *return_value = device;
1935
1936         return AE_OK;
1937 }
1938
1939 static int acpi_scan_attach_handler(struct acpi_device *device)
1940 {
1941         struct acpi_hardware_id *hwid;
1942         int ret = 0;
1943
1944         list_for_each_entry(hwid, &device->pnp.ids, list) {
1945                 const struct acpi_device_id *devid;
1946                 struct acpi_scan_handler *handler;
1947
1948                 handler = acpi_scan_match_handler(hwid->id, &devid);
1949                 if (handler) {
1950                         ret = handler->attach(device, devid);
1951                         if (ret > 0) {
1952                                 device->handler = handler;
1953                                 break;
1954                         } else if (ret < 0) {
1955                                 break;
1956                         }
1957                 }
1958         }
1959         return ret;
1960 }
1961
1962 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1963                                           void *not_used, void **ret_not_used)
1964 {
1965         struct acpi_device *device;
1966         unsigned long long sta_not_used;
1967         int ret;
1968
1969         /*
1970          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1971          * namespace walks prematurely.
1972          */
1973         if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1974                 return AE_OK;
1975
1976         if (acpi_bus_get_device(handle, &device))
1977                 return AE_CTRL_DEPTH;
1978
1979         ret = acpi_scan_attach_handler(device);
1980         if (ret)
1981                 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1982
1983         ret = device_attach(&device->dev);
1984         return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1985 }
1986
1987 /**
1988  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1989  * @handle: Root of the namespace scope to scan.
1990  *
1991  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1992  * found devices.
1993  *
1994  * If no devices were found, -ENODEV is returned, but it does not mean that
1995  * there has been a real error.  There just have been no suitable ACPI objects
1996  * in the table trunk from which the kernel could create a device and add an
1997  * appropriate driver.
1998  *
1999  * Must be called under acpi_scan_lock.
2000  */
2001 int acpi_bus_scan(acpi_handle handle)
2002 {
2003         void *device = NULL;
2004         int error = 0;
2005
2006         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2007                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2008                                     acpi_bus_check_add, NULL, NULL, &device);
2009
2010         if (!device)
2011                 error = -ENODEV;
2012         else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
2013                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2014                                     acpi_bus_device_attach, NULL, NULL, NULL);
2015
2016         return error;
2017 }
2018 EXPORT_SYMBOL(acpi_bus_scan);
2019
2020 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
2021                                           void *not_used, void **ret_not_used)
2022 {
2023         struct acpi_device *device = NULL;
2024
2025         if (!acpi_bus_get_device(handle, &device)) {
2026                 struct acpi_scan_handler *dev_handler = device->handler;
2027
2028                 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
2029                 if (dev_handler) {
2030                         if (dev_handler->detach)
2031                                 dev_handler->detach(device);
2032
2033                         device->handler = NULL;
2034                 } else {
2035                         device_release_driver(&device->dev);
2036                 }
2037         }
2038         return AE_OK;
2039 }
2040
2041 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
2042                                    void *not_used, void **ret_not_used)
2043 {
2044         struct acpi_device *device = NULL;
2045
2046         if (!acpi_bus_get_device(handle, &device))
2047                 acpi_device_unregister(device);
2048
2049         return AE_OK;
2050 }
2051
2052 /**
2053  * acpi_bus_trim - Remove ACPI device node and all of its descendants
2054  * @start: Root of the ACPI device nodes subtree to remove.
2055  *
2056  * Must be called under acpi_scan_lock.
2057  */
2058 void acpi_bus_trim(struct acpi_device *start)
2059 {
2060         /*
2061          * Execute acpi_bus_device_detach() as a post-order callback to detach
2062          * all ACPI drivers from the device nodes being removed.
2063          */
2064         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2065                             acpi_bus_device_detach, NULL, NULL);
2066         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
2067         /*
2068          * Execute acpi_bus_remove() as a post-order callback to remove device
2069          * nodes in the given namespace scope.
2070          */
2071         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2072                             acpi_bus_remove, NULL, NULL);
2073         acpi_bus_remove(start->handle, 0, NULL, NULL);
2074 }
2075 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2076
2077 static int acpi_bus_scan_fixed(void)
2078 {
2079         int result = 0;
2080
2081         /*
2082          * Enumerate all fixed-feature devices.
2083          */
2084         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2085                 struct acpi_device *device = NULL;
2086
2087                 result = acpi_add_single_object(&device, NULL,
2088                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2089                                                 ACPI_STA_DEFAULT);
2090                 if (result)
2091                         return result;
2092
2093                 result = device_attach(&device->dev);
2094                 if (result < 0)
2095                         return result;
2096
2097                 device_init_wakeup(&device->dev, true);
2098         }
2099
2100         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2101                 struct acpi_device *device = NULL;
2102
2103                 result = acpi_add_single_object(&device, NULL,
2104                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2105                                                 ACPI_STA_DEFAULT);
2106                 if (result)
2107                         return result;
2108
2109                 result = device_attach(&device->dev);
2110         }
2111
2112         return result < 0 ? result : 0;
2113 }
2114
2115 int __init acpi_scan_init(void)
2116 {
2117         int result;
2118
2119         result = bus_register(&acpi_bus_type);
2120         if (result) {
2121                 /* We don't want to quit even if we failed to add suspend/resume */
2122                 printk(KERN_ERR PREFIX "Could not register bus type\n");
2123         }
2124
2125         acpi_pci_root_init();
2126         acpi_pci_link_init();
2127         acpi_processor_init();
2128         acpi_platform_init();
2129         acpi_lpss_init();
2130         acpi_csrt_init();
2131         acpi_container_init();
2132         acpi_memory_hotplug_init();
2133
2134         mutex_lock(&acpi_scan_lock);
2135         /*
2136          * Enumerate devices in the ACPI namespace.
2137          */
2138         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2139         if (result)
2140                 goto out;
2141
2142         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2143         if (result)
2144                 goto out;
2145
2146         result = acpi_bus_scan_fixed();
2147         if (result) {
2148                 acpi_device_unregister(acpi_root);
2149                 goto out;
2150         }
2151
2152         acpi_update_all_gpes();
2153
2154         acpi_pci_root_hp_init();
2155
2156  out:
2157         mutex_unlock(&acpi_scan_lock);
2158         return result;
2159 }