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 <asm/pgtable.h>
  16
  17 #include "internal.h"
  18
  19 #define _COMPONENT              ACPI_BUS_COMPONENT
  20 ACPI_MODULE_NAME("scan");
  21 extern struct acpi_device *acpi_root;
  22
  23 #define ACPI_BUS_CLASS                  "system_bus"
  24 #define ACPI_BUS_HID                    "LNXSYBUS"
  25 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  26
  27 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  28
  29 #define INVALID_ACPI_HANDLE     ((acpi_handle)empty_zero_page)
  30
  31 /*
  32  * If set, devices will be hot-removed even if they cannot be put offline
  33  * gracefully (from the kernel's standpoint).
  34  */
  35 bool acpi_force_hot_remove;
  36
  37 static const char *dummy_hid = "device";
  38
  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 static DEFINE_MUTEX(acpi_hp_context_lock);
  45
  46 struct acpi_device_bus_id{
  47         char bus_id[15];
  48         unsigned int instance_no;
  49         struct list_head node;
  50 };
  51
  52 void acpi_scan_lock_acquire(void)
  53 {
  54         mutex_lock(&acpi_scan_lock);
  55 }
  56 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  57
  58 void acpi_scan_lock_release(void)
  59 {
  60         mutex_unlock(&acpi_scan_lock);
  61 }
  62 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  63
  64 void acpi_lock_hp_context(void)
  65 {
  66         mutex_lock(&acpi_hp_context_lock);
  67 }
  68
  69 void acpi_unlock_hp_context(void)
  70 {
  71         mutex_unlock(&acpi_hp_context_lock);
  72 }
  73
  74 void acpi_initialize_hp_context(struct acpi_device *adev,
  75                                 struct acpi_hotplug_context *hp,
  76                                 int (*notify)(struct acpi_device *, u32),
  77                                 void (*uevent)(struct acpi_device *, u32))
  78 {
  79         acpi_lock_hp_context();
  80         hp->notify = notify;
  81         hp->uevent = uevent;
  82         acpi_set_hp_context(adev, hp);
  83         acpi_unlock_hp_context();
  84 }
  85 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
  86
  87 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  88 {
  89         if (!handler)
  90                 return -EINVAL;
  91
  92         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  93         return 0;
  94 }
  95
  96 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
  97                                        const char *hotplug_profile_name)
  98 {
  99         int error;
 100
 101         error = acpi_scan_add_handler(handler);
 102         if (error)
 103                 return error;
 104
 105         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
 106         return 0;
 107 }
 108
 109 /*
 110  * Creates hid/cid(s) string needed for modalias and uevent
 111  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
 112  * char *modalias: "acpi:IBM0001:ACPI0001"
 113  * Return: 0: no _HID and no _CID
 114  *         -EINVAL: output error
 115  *         -ENOMEM: output is truncated
 116 */
 117 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
 118                            int size)
 119 {
 120         int len;
 121         int count;
 122         struct acpi_hardware_id *id;
 123
 124         if (list_empty(&acpi_dev->pnp.ids))
 125                 return 0;
 126
 127         len = snprintf(modalias, size, "acpi:");
 128         size -= len;
 129
 130         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
 131                 count = snprintf(&modalias[len], size, "%s:", id->id);
 132                 if (count < 0)
 133                         return EINVAL;
 134                 if (count >= size)
 135                         return -ENOMEM;
 136                 len += count;
 137                 size -= count;
 138         }
 139
 140         modalias[len] = '\0';
 141         return len;
 142 }
 143
 144 /*
 145  * Creates uevent modalias field for ACPI enumerated devices.
 146  * Because the other buses does not support ACPI HIDs & CIDs.
 147  * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
 148  * "acpi:IBM0001:ACPI0001"
 149  */
 150 int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
 151 {
 152         struct acpi_device *acpi_dev;
 153         int len;
 154
 155         acpi_dev = ACPI_COMPANION(dev);
 156         if (!acpi_dev)
 157                 return -ENODEV;
 158
 159         /* Fall back to bus specific way of modalias exporting */
 160         if (list_empty(&acpi_dev->pnp.ids))
 161                 return -ENODEV;
 162
 163         if (add_uevent_var(env, "MODALIAS="))
 164                 return -ENOMEM;
 165         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 166                                 sizeof(env->buf) - env->buflen);
 167         if (len <= 0)
 168                 return len;
 169         env->buflen += len;
 170         return 0;
 171 }
 172 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
 173
 174 /*
 175  * Creates modalias sysfs attribute for ACPI enumerated devices.
 176  * Because the other buses does not support ACPI HIDs & CIDs.
 177  * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
 178  * "acpi:IBM0001:ACPI0001"
 179  */
 180 int acpi_device_modalias(struct device *dev, char *buf, int size)
 181 {
 182         struct acpi_device *acpi_dev;
 183         int len;
 184
 185         acpi_dev = ACPI_COMPANION(dev);
 186         if (!acpi_dev)
 187                 return -ENODEV;
 188
 189         /* Fall back to bus specific way of modalias exporting */
 190         if (list_empty(&acpi_dev->pnp.ids))
 191                 return -ENODEV;
 192
 193         len = create_modalias(acpi_dev, buf, size -1);
 194         if (len <= 0)
 195                 return len;
 196         buf[len++] = '\n';
 197         return len;
 198 }
 199 EXPORT_SYMBOL_GPL(acpi_device_modalias);
 200
 201 static ssize_t
 202 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
 203         struct acpi_device *acpi_dev = to_acpi_device(dev);
 204         int len;
 205
 206         len = create_modalias(acpi_dev, buf, 1024);
 207         if (len <= 0)
 208                 return len;
 209         buf[len++] = '\n';
 210         return len;
 211 }
 212 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 213
 214 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 215 {
 216         struct acpi_device_physical_node *pn;
 217         bool offline = true;
 218
 219         mutex_lock(&adev->physical_node_lock);
 220
 221         list_for_each_entry(pn, &adev->physical_node_list, node)
 222                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
 223                         if (uevent)
 224                                 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
 225
 226                         offline = false;
 227                         break;
 228                 }
 229
 230         mutex_unlock(&adev->physical_node_lock);
 231         return offline;
 232 }
 233
 234 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 235                                     void **ret_p)
 236 {
 237         struct acpi_device *device = NULL;
 238         struct acpi_device_physical_node *pn;
 239         bool second_pass = (bool)data;
 240         acpi_status status = AE_OK;
 241
 242         if (acpi_bus_get_device(handle, &device))
 243                 return AE_OK;
 244
 245         if (device->handler && !device->handler->hotplug.enabled) {
 246                 *ret_p = &device->dev;
 247                 return AE_SUPPORT;
 248         }
 249
 250         mutex_lock(&device->physical_node_lock);
 251
 252         list_for_each_entry(pn, &device->physical_node_list, node) {
 253                 int ret;
 254
 255                 if (second_pass) {
 256                         /* Skip devices offlined by the first pass. */
 257                         if (pn->put_online)
 258                                 continue;
 259                 } else {
 260                         pn->put_online = false;
 261                 }
 262                 ret = device_offline(pn->dev);
 263                 if (acpi_force_hot_remove)
 264                         continue;
 265
 266                 if (ret >= 0) {
 267                         pn->put_online = !ret;
 268                 } else {
 269                         *ret_p = pn->dev;
 270                         if (second_pass) {
 271                                 status = AE_ERROR;
 272                                 break;
 273                         }
 274                 }
 275         }
 276
 277         mutex_unlock(&device->physical_node_lock);
 278
 279         return status;
 280 }
 281
 282 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 283                                    void **ret_p)
 284 {
 285         struct acpi_device *device = NULL;
 286         struct acpi_device_physical_node *pn;
 287
 288         if (acpi_bus_get_device(handle, &device))
 289                 return AE_OK;
 290
 291         mutex_lock(&device->physical_node_lock);
 292
 293         list_for_each_entry(pn, &device->physical_node_list, node)
 294                 if (pn->put_online) {
 295                         device_online(pn->dev);
 296                         pn->put_online = false;
 297                 }
 298
 299         mutex_unlock(&device->physical_node_lock);
 300
 301         return AE_OK;
 302 }
 303
 304 static int acpi_scan_try_to_offline(struct acpi_device *device)
 305 {
 306         acpi_handle handle = device->handle;
 307         struct device *errdev = NULL;
 308         acpi_status status;
 309
 310         /*
 311          * Carry out two passes here and ignore errors in the first pass,
 312          * because if the devices in question are memory blocks and
 313          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 314          * that the other blocks depend on, but it is not known in advance which
 315          * block holds them.
 316          *
 317          * If the first pass is successful, the second one isn't needed, though.
 318          */
 319         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 320                                      NULL, acpi_bus_offline, (void *)false,
 321                                      (void **)&errdev);
 322         if (status == AE_SUPPORT) {
 323                 dev_warn(errdev, "Offline disabled.\n");
 324                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 325                                     acpi_bus_online, NULL, NULL, NULL);
 326                 return -EPERM;
 327         }
 328         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
 329         if (errdev) {
 330                 errdev = NULL;
 331                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 332                                     NULL, acpi_bus_offline, (void *)true,
 333                                     (void **)&errdev);
 334                 if (!errdev || acpi_force_hot_remove)
 335                         acpi_bus_offline(handle, 0, (void *)true,
 336                                          (void **)&errdev);
 337
 338                 if (errdev && !acpi_force_hot_remove) {
 339                         dev_warn(errdev, "Offline failed.\n");
 340                         acpi_bus_online(handle, 0, NULL, NULL);
 341                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 342                                             ACPI_UINT32_MAX, acpi_bus_online,
 343                                             NULL, NULL, NULL);
 344                         return -EBUSY;
 345                 }
 346         }
 347         return 0;
 348 }
 349
 350 static int acpi_scan_hot_remove(struct acpi_device *device)
 351 {
 352         acpi_handle handle = device->handle;
 353         unsigned long long sta;
 354         acpi_status status;
 355
 356         if (device->handler->hotplug.demand_offline && !acpi_force_hot_remove) {
 357                 if (!acpi_scan_is_offline(device, true))
 358                         return -EBUSY;
 359         } else {
 360                 int error = acpi_scan_try_to_offline(device);
 361                 if (error)
 362                         return error;
 363         }
 364
 365         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 366                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 367
 368         acpi_bus_trim(device);
 369
 370         acpi_evaluate_lck(handle, 0);
 371         /*
 372          * TBD: _EJD support.
 373          */
 374         status = acpi_evaluate_ej0(handle);
 375         if (status == AE_NOT_FOUND)
 376                 return -ENODEV;
 377         else if (ACPI_FAILURE(status))
 378                 return -EIO;
 379
 380         /*
 381          * Verify if eject was indeed successful.  If not, log an error
 382          * message.  No need to call _OST since _EJ0 call was made OK.
 383          */
 384         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 385         if (ACPI_FAILURE(status)) {
 386                 acpi_handle_warn(handle,
 387                         "Status check after eject failed (0x%x)\n", status);
 388         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 389                 acpi_handle_warn(handle,
 390                         "Eject incomplete - status 0x%llx\n", sta);
 391         }
 392
 393         return 0;
 394 }
 395
 396 static int acpi_scan_device_not_present(struct acpi_device *adev)
 397 {
 398         if (!acpi_device_enumerated(adev)) {
 399                 dev_warn(&adev->dev, "Still not present\n");
 400                 return -EALREADY;
 401         }
 402         acpi_bus_trim(adev);
 403         return 0;
 404 }
 405
 406 static int acpi_scan_device_check(struct acpi_device *adev)
 407 {
 408         int error;
 409
 410         acpi_bus_get_status(adev);
 411         if (adev->status.present || adev->status.functional) {
 412                 /*
 413                  * This function is only called for device objects for which
 414                  * matching scan handlers exist.  The only situation in which
 415                  * the scan handler is not attached to this device object yet
 416                  * is when the device has just appeared (either it wasn't
 417                  * present at all before or it was removed and then added
 418                  * again).
 419                  */
 420                 if (adev->handler) {
 421                         dev_warn(&adev->dev, "Already enumerated\n");
 422                         return -EALREADY;
 423                 }
 424                 error = acpi_bus_scan(adev->handle);
 425                 if (error) {
 426                         dev_warn(&adev->dev, "Namespace scan failure\n");
 427                         return error;
 428                 }
 429                 if (!adev->handler) {
 430                         dev_warn(&adev->dev, "Enumeration failure\n");
 431                         error = -ENODEV;
 432                 }
 433         } else {
 434                 error = acpi_scan_device_not_present(adev);
 435         }
 436         return error;
 437 }
 438
 439 static int acpi_scan_bus_check(struct acpi_device *adev)
 440 {
 441         struct acpi_scan_handler *handler = adev->handler;
 442         struct acpi_device *child;
 443         int error;
 444
 445         acpi_bus_get_status(adev);
 446         if (!(adev->status.present || adev->status.functional)) {
 447                 acpi_scan_device_not_present(adev);
 448                 return 0;
 449         }
 450         if (handler && handler->hotplug.scan_dependent)
 451                 return handler->hotplug.scan_dependent(adev);
 452
 453         error = acpi_bus_scan(adev->handle);
 454         if (error) {
 455                 dev_warn(&adev->dev, "Namespace scan failure\n");
 456                 return error;
 457         }
 458         list_for_each_entry(child, &adev->children, node) {
 459                 error = acpi_scan_bus_check(child);
 460                 if (error)
 461                         return error;
 462         }
 463         return 0;
 464 }
 465
 466 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 467 {
 468         switch (type) {
 469         case ACPI_NOTIFY_BUS_CHECK:
 470                 return acpi_scan_bus_check(adev);
 471         case ACPI_NOTIFY_DEVICE_CHECK:
 472                 return acpi_scan_device_check(adev);
 473         case ACPI_NOTIFY_EJECT_REQUEST:
 474         case ACPI_OST_EC_OSPM_EJECT:
 475                 if (adev->handler && !adev->handler->hotplug.enabled) {
 476                         dev_info(&adev->dev, "Eject disabled\n");
 477                         return -EPERM;
 478                 }
 479                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 480                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 481                 return acpi_scan_hot_remove(adev);
 482         }
 483         return -EINVAL;
 484 }
 485
 486 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 487 {
 488         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 489         int error = -ENODEV;
 490
 491         lock_device_hotplug();
 492         mutex_lock(&acpi_scan_lock);
 493
 494         /*
 495          * The device object's ACPI handle cannot become invalid as long as we
 496          * are holding acpi_scan_lock, but it might have become invalid before
 497          * that lock was acquired.
 498          */
 499         if (adev->handle == INVALID_ACPI_HANDLE)
 500                 goto err_out;
 501
 502         if (adev->flags.is_dock_station) {
 503                 error = dock_notify(adev, src);
 504         } else if (adev->flags.hotplug_notify) {
 505                 error = acpi_generic_hotplug_event(adev, src);
 506                 if (error == -EPERM) {
 507                         ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 508                         goto err_out;
 509                 }
 510         } else {
 511                 int (*notify)(struct acpi_device *, u32);
 512
 513                 acpi_lock_hp_context();
 514                 notify = adev->hp ? adev->hp->notify : NULL;
 515                 acpi_unlock_hp_context();
 516                 /*
 517                  * There may be additional notify handlers for device objects
 518                  * without the .event() callback, so ignore them here.
 519                  */
 520                 if (notify)
 521                         error = notify(adev, src);
 522                 else
 523                         goto out;
 524         }
 525         if (!error)
 526                 ost_code = ACPI_OST_SC_SUCCESS;
 527
 528  err_out:
 529         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 530
 531  out:
 532         acpi_bus_put_acpi_device(adev);
 533         mutex_unlock(&acpi_scan_lock);
 534         unlock_device_hotplug();
 535 }
 536
 537 static ssize_t real_power_state_show(struct device *dev,
 538                                      struct device_attribute *attr, char *buf)
 539 {
 540         struct acpi_device *adev = to_acpi_device(dev);
 541         int state;
 542         int ret;
 543
 544         ret = acpi_device_get_power(adev, &state);
 545         if (ret)
 546                 return ret;
 547
 548         return sprintf(buf, "%s\n", acpi_power_state_string(state));
 549 }
 550
 551 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 552
 553 static ssize_t power_state_show(struct device *dev,
 554                                 struct device_attribute *attr, char *buf)
 555 {
 556         struct acpi_device *adev = to_acpi_device(dev);
 557
 558         return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 559 }
 560
 561 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 562
 563 static ssize_t
 564 acpi_eject_store(struct device *d, struct device_attribute *attr,
 565                 const char *buf, size_t count)
 566 {
 567         struct acpi_device *acpi_device = to_acpi_device(d);
 568         acpi_object_type not_used;
 569         acpi_status status;
 570
 571         if (!count || buf[0] != '1')
 572                 return -EINVAL;
 573
 574         if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
 575             && !acpi_device->driver)
 576                 return -ENODEV;
 577
 578         status = acpi_get_type(acpi_device->handle, &not_used);
 579         if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
 580                 return -ENODEV;
 581
 582         get_device(&acpi_device->dev);
 583         status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
 584         if (ACPI_SUCCESS(status))
 585                 return count;
 586
 587         put_device(&acpi_device->dev);
 588         acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
 589                           ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 590         return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
 591 }
 592
 593 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 594
 595 static ssize_t
 596 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 597         struct acpi_device *acpi_dev = to_acpi_device(dev);
 598
 599         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 600 }
 601 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 602
 603 static ssize_t acpi_device_uid_show(struct device *dev,
 604                                     struct device_attribute *attr, char *buf)
 605 {
 606         struct acpi_device *acpi_dev = to_acpi_device(dev);
 607
 608         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 609 }
 610 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 611
 612 static ssize_t acpi_device_adr_show(struct device *dev,
 613                                     struct device_attribute *attr, char *buf)
 614 {
 615         struct acpi_device *acpi_dev = to_acpi_device(dev);
 616
 617         return sprintf(buf, "0x%08x\n",
 618                        (unsigned int)(acpi_dev->pnp.bus_address));
 619 }
 620 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 621
 622 static ssize_t
 623 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 624         struct acpi_device *acpi_dev = to_acpi_device(dev);
 625         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 626         int result;
 627
 628         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 629         if (result)
 630                 goto end;
 631
 632         result = sprintf(buf, "%s\n", (char*)path.pointer);
 633         kfree(path.pointer);
 634 end:
 635         return result;
 636 }
 637 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 638
 639 /* sysfs file that shows description text from the ACPI _STR method */
 640 static ssize_t description_show(struct device *dev,
 641                                 struct device_attribute *attr,
 642                                 char *buf) {
 643         struct acpi_device *acpi_dev = to_acpi_device(dev);
 644         int result;
 645
 646         if (acpi_dev->pnp.str_obj == NULL)
 647                 return 0;
 648
 649         /*
 650          * The _STR object contains a Unicode identifier for a device.
 651          * We need to convert to utf-8 so it can be displayed.
 652          */
 653         result = utf16s_to_utf8s(
 654                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 655                 acpi_dev->pnp.str_obj->buffer.length,
 656                 UTF16_LITTLE_ENDIAN, buf,
 657                 PAGE_SIZE);
 658
 659         buf[result++] = '\n';
 660
 661         return result;
 662 }
 663 static DEVICE_ATTR(description, 0444, description_show, NULL);
 664
 665 static ssize_t
 666 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 667                      char *buf) {
 668         struct acpi_device *acpi_dev = to_acpi_device(dev);
 669
 670         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 671 }
 672 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 673
 674 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
 675                                 char *buf) {
 676         struct acpi_device *acpi_dev = to_acpi_device(dev);
 677         acpi_status status;
 678         unsigned long long sta;
 679
 680         status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
 681         if (ACPI_FAILURE(status))
 682                 return -ENODEV;
 683
 684         return sprintf(buf, "%llu\n", sta);
 685 }
 686 static DEVICE_ATTR_RO(status);
 687
 688 static int acpi_device_setup_files(struct acpi_device *dev)
 689 {
 690         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 691         acpi_status status;
 692         unsigned long long sun;
 693         int result = 0;
 694
 695         /*
 696          * Devices gotten from FADT don't have a "path" attribute
 697          */
 698         if (dev->handle) {
 699                 result = device_create_file(&dev->dev, &dev_attr_path);
 700                 if (result)
 701                         goto end;
 702         }
 703
 704         if (!list_empty(&dev->pnp.ids)) {
 705                 result = device_create_file(&dev->dev, &dev_attr_hid);
 706                 if (result)
 707                         goto end;
 708
 709                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 710                 if (result)
 711                         goto end;
 712         }
 713
 714         /*
 715          * If device has _STR, 'description' file is created
 716          */
 717         if (acpi_has_method(dev->handle, "_STR")) {
 718                 status = acpi_evaluate_object(dev->handle, "_STR",
 719                                         NULL, &buffer);
 720                 if (ACPI_FAILURE(status))
 721                         buffer.pointer = NULL;
 722                 dev->pnp.str_obj = buffer.pointer;
 723                 result = device_create_file(&dev->dev, &dev_attr_description);
 724                 if (result)
 725                         goto end;
 726         }
 727
 728         if (dev->pnp.type.bus_address)
 729                 result = device_create_file(&dev->dev, &dev_attr_adr);
 730         if (dev->pnp.unique_id)
 731                 result = device_create_file(&dev->dev, &dev_attr_uid);
 732
 733         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 734         if (ACPI_SUCCESS(status)) {
 735                 dev->pnp.sun = (unsigned long)sun;
 736                 result = device_create_file(&dev->dev, &dev_attr_sun);
 737                 if (result)
 738                         goto end;
 739         } else {
 740                 dev->pnp.sun = (unsigned long)-1;
 741         }
 742
 743         if (acpi_has_method(dev->handle, "_STA")) {
 744                 result = device_create_file(&dev->dev, &dev_attr_status);
 745                 if (result)
 746                         goto end;
 747         }
 748
 749         /*
 750          * If device has _EJ0, 'eject' file is created that is used to trigger
 751          * hot-removal function from userland.
 752          */
 753         if (acpi_has_method(dev->handle, "_EJ0")) {
 754                 result = device_create_file(&dev->dev, &dev_attr_eject);
 755                 if (result)
 756                         return result;
 757         }
 758
 759         if (dev->flags.power_manageable) {
 760                 result = device_create_file(&dev->dev, &dev_attr_power_state);
 761                 if (result)
 762                         return result;
 763
 764                 if (dev->power.flags.power_resources)
 765                         result = device_create_file(&dev->dev,
 766                                                     &dev_attr_real_power_state);
 767         }
 768
 769 end:
 770         return result;
 771 }
 772
 773 static void acpi_device_remove_files(struct acpi_device *dev)
 774 {
 775         if (dev->flags.power_manageable) {
 776                 device_remove_file(&dev->dev, &dev_attr_power_state);
 777                 if (dev->power.flags.power_resources)
 778                         device_remove_file(&dev->dev,
 779                                            &dev_attr_real_power_state);
 780         }
 781
 782         /*
 783          * If device has _STR, remove 'description' file
 784          */
 785         if (acpi_has_method(dev->handle, "_STR")) {
 786                 kfree(dev->pnp.str_obj);
 787                 device_remove_file(&dev->dev, &dev_attr_description);
 788         }
 789         /*
 790          * If device has _EJ0, remove 'eject' file.
 791          */
 792         if (acpi_has_method(dev->handle, "_EJ0"))
 793                 device_remove_file(&dev->dev, &dev_attr_eject);
 794
 795         if (acpi_has_method(dev->handle, "_SUN"))
 796                 device_remove_file(&dev->dev, &dev_attr_sun);
 797
 798         if (dev->pnp.unique_id)
 799                 device_remove_file(&dev->dev, &dev_attr_uid);
 800         if (dev->pnp.type.bus_address)
 801                 device_remove_file(&dev->dev, &dev_attr_adr);
 802         device_remove_file(&dev->dev, &dev_attr_modalias);
 803         device_remove_file(&dev->dev, &dev_attr_hid);
 804         if (acpi_has_method(dev->handle, "_STA"))
 805                 device_remove_file(&dev->dev, &dev_attr_status);
 806         if (dev->handle)
 807                 device_remove_file(&dev->dev, &dev_attr_path);
 808 }
 809 /* --------------------------------------------------------------------------
 810                         ACPI Bus operations
 811    -------------------------------------------------------------------------- */
 812
 813 static const struct acpi_device_id *__acpi_match_device(
 814         struct acpi_device *device, const struct acpi_device_id *ids)
 815 {
 816         const struct acpi_device_id *id;
 817         struct acpi_hardware_id *hwid;
 818
 819         /*
 820          * If the device is not present, it is unnecessary to load device
 821          * driver for it.
 822          */
 823         if (!device->status.present)
 824                 return NULL;
 825
 826         for (id = ids; id->id[0]; id++)
 827                 list_for_each_entry(hwid, &device->pnp.ids, list)
 828                         if (!strcmp((char *) id->id, hwid->id))
 829                                 return id;
 830
 831         return NULL;
 832 }
 833
 834 /**
 835  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 836  * @ids: Array of struct acpi_device_id object to match against.
 837  * @dev: The device structure to match.
 838  *
 839  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 840  * object for that handle and use that object to match against a given list of
 841  * device IDs.
 842  *
 843  * Return a pointer to the first matching ID on success or %NULL on failure.
 844  */
 845 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 846                                                const struct device *dev)
 847 {
 848         struct acpi_device *adev;
 849         acpi_handle handle = ACPI_HANDLE(dev);
 850
 851         if (!ids || !handle || acpi_bus_get_device(handle, &adev))
 852                 return NULL;
 853
 854         return __acpi_match_device(adev, ids);
 855 }
 856 EXPORT_SYMBOL_GPL(acpi_match_device);
 857
 858 int acpi_match_device_ids(struct acpi_device *device,
 859                           const struct acpi_device_id *ids)
 860 {
 861         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 862 }
 863 EXPORT_SYMBOL(acpi_match_device_ids);
 864
 865 static void acpi_free_power_resources_lists(struct acpi_device *device)
 866 {
 867         int i;
 868
 869         if (device->wakeup.flags.valid)
 870                 acpi_power_resources_list_free(&device->wakeup.resources);
 871
 872         if (!device->flags.power_manageable)
 873                 return;
 874
 875         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 876                 struct acpi_device_power_state *ps = &device->power.states[i];
 877                 acpi_power_resources_list_free(&ps->resources);
 878         }
 879 }
 880
 881 static void acpi_device_release(struct device *dev)
 882 {
 883         struct acpi_device *acpi_dev = to_acpi_device(dev);
 884
 885         acpi_free_pnp_ids(&acpi_dev->pnp);
 886         acpi_free_power_resources_lists(acpi_dev);
 887         kfree(acpi_dev);
 888 }
 889
 890 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 891 {
 892         struct acpi_device *acpi_dev = to_acpi_device(dev);
 893         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 894
 895         return acpi_dev->flags.match_driver
 896                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 897 }
 898
 899 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 900 {
 901         struct acpi_device *acpi_dev = to_acpi_device(dev);
 902         int len;
 903
 904         if (list_empty(&acpi_dev->pnp.ids))
 905                 return 0;
 906
 907         if (add_uevent_var(env, "MODALIAS="))
 908                 return -ENOMEM;
 909         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 910                               sizeof(env->buf) - env->buflen);
 911         if (len <= 0)
 912                 return len;
 913         env->buflen += len;
 914         return 0;
 915 }
 916
 917 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 918 {
 919         struct acpi_device *device = data;
 920
 921         device->driver->ops.notify(device, event);
 922 }
 923
 924 static acpi_status acpi_device_notify_fixed(void *data)
 925 {
 926         struct acpi_device *device = data;
 927
 928         /* Fixed hardware devices have no handles */
 929         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 930         return AE_OK;
 931 }
 932
 933 static int acpi_device_install_notify_handler(struct acpi_device *device)
 934 {
 935         acpi_status status;
 936
 937         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 938                 status =
 939                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 940                                                      acpi_device_notify_fixed,
 941                                                      device);
 942         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 943                 status =
 944                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 945                                                      acpi_device_notify_fixed,
 946                                                      device);
 947         else
 948                 status = acpi_install_notify_handler(device->handle,
 949                                                      ACPI_DEVICE_NOTIFY,
 950                                                      acpi_device_notify,
 951                                                      device);
 952
 953         if (ACPI_FAILURE(status))
 954                 return -EINVAL;
 955         return 0;
 956 }
 957
 958 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 959 {
 960         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 961                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 962                                                 acpi_device_notify_fixed);
 963         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 964                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 965                                                 acpi_device_notify_fixed);
 966         else
 967                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 968                                            acpi_device_notify);
 969 }
 970
 971 static int acpi_device_probe(struct device *dev)
 972 {
 973         struct acpi_device *acpi_dev = to_acpi_device(dev);
 974         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 975         int ret;
 976
 977         if (acpi_dev->handler)
 978                 return -EINVAL;
 979
 980         if (!acpi_drv->ops.add)
 981                 return -ENOSYS;
 982
 983         ret = acpi_drv->ops.add(acpi_dev);
 984         if (ret)
 985                 return ret;
 986
 987         acpi_dev->driver = acpi_drv;
 988         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 989                           "Driver [%s] successfully bound to device [%s]\n",
 990                           acpi_drv->name, acpi_dev->pnp.bus_id));
 991
 992         if (acpi_drv->ops.notify) {
 993                 ret = acpi_device_install_notify_handler(acpi_dev);
 994                 if (ret) {
 995                         if (acpi_drv->ops.remove)
 996                                 acpi_drv->ops.remove(acpi_dev);
 997
 998                         acpi_dev->driver = NULL;
 999                         acpi_dev->driver_data = NULL;
1000                         return ret;
1001                 }
1002         }
1003
1004         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1005                           acpi_drv->name, acpi_dev->pnp.bus_id));
1006         get_device(dev);
1007         return 0;
1008 }
1009
1010 static int acpi_device_remove(struct device * dev)
1011 {
1012         struct acpi_device *acpi_dev = to_acpi_device(dev);
1013         struct acpi_driver *acpi_drv = acpi_dev->driver;
1014
1015         if (acpi_drv) {
1016                 if (acpi_drv->ops.notify)
1017                         acpi_device_remove_notify_handler(acpi_dev);
1018                 if (acpi_drv->ops.remove)
1019                         acpi_drv->ops.remove(acpi_dev);
1020         }
1021         acpi_dev->driver = NULL;
1022         acpi_dev->driver_data = NULL;
1023
1024         put_device(dev);
1025         return 0;
1026 }
1027
1028 struct bus_type acpi_bus_type = {
1029         .name           = "acpi",
1030         .match          = acpi_bus_match,
1031         .probe          = acpi_device_probe,
1032         .remove         = acpi_device_remove,
1033         .uevent         = acpi_device_uevent,
1034 };
1035
1036 static void acpi_device_del(struct acpi_device *device)
1037 {
1038         mutex_lock(&acpi_device_lock);
1039         if (device->parent)
1040                 list_del(&device->node);
1041
1042         list_del(&device->wakeup_list);
1043         mutex_unlock(&acpi_device_lock);
1044
1045         acpi_power_add_remove_device(device, false);
1046         acpi_device_remove_files(device);
1047         if (device->remove)
1048                 device->remove(device);
1049
1050         device_del(&device->dev);
1051 }
1052
1053 static LIST_HEAD(acpi_device_del_list);
1054 static DEFINE_MUTEX(acpi_device_del_lock);
1055
1056 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1057 {
1058         for (;;) {
1059                 struct acpi_device *adev;
1060
1061                 mutex_lock(&acpi_device_del_lock);
1062
1063                 if (list_empty(&acpi_device_del_list)) {
1064                         mutex_unlock(&acpi_device_del_lock);
1065                         break;
1066                 }
1067                 adev = list_first_entry(&acpi_device_del_list,
1068                                         struct acpi_device, del_list);
1069                 list_del(&adev->del_list);
1070
1071                 mutex_unlock(&acpi_device_del_lock);
1072
1073                 acpi_device_del(adev);
1074                 /*
1075                  * Drop references to all power resources that might have been
1076                  * used by the device.
1077                  */
1078                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1079                 put_device(&adev->dev);
1080         }
1081 }
1082
1083 /**
1084  * acpi_scan_drop_device - Drop an ACPI device object.
1085  * @handle: Handle of an ACPI namespace node, not used.
1086  * @context: Address of the ACPI device object to drop.
1087  *
1088  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1089  * namespace node the device object pointed to by @context is attached to.
1090  *
1091  * The unregistration is carried out asynchronously to avoid running
1092  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1093  * ensure the correct ordering (the device objects must be unregistered in the
1094  * same order in which the corresponding namespace nodes are deleted).
1095  */
1096 static void acpi_scan_drop_device(acpi_handle handle, void *context)
1097 {
1098         static DECLARE_WORK(work, acpi_device_del_work_fn);
1099         struct acpi_device *adev = context;
1100
1101         mutex_lock(&acpi_device_del_lock);
1102
1103         /*
1104          * Use the ACPI hotplug workqueue which is ordered, so this work item
1105          * won't run after any hotplug work items submitted subsequently.  That
1106          * prevents attempts to register device objects identical to those being
1107          * deleted from happening concurrently (such attempts result from
1108          * hotplug events handled via the ACPI hotplug workqueue).  It also will
1109          * run after all of the work items submitted previosuly, which helps
1110          * those work items to ensure that they are not accessing stale device
1111          * objects.
1112          */
1113         if (list_empty(&acpi_device_del_list))
1114                 acpi_queue_hotplug_work(&work);
1115
1116         list_add_tail(&adev->del_list, &acpi_device_del_list);
1117         /* Make acpi_ns_validate_handle() return NULL for this handle. */
1118         adev->handle = INVALID_ACPI_HANDLE;
1119
1120         mutex_unlock(&acpi_device_del_lock);
1121 }
1122
1123 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
1124                                 void (*callback)(void *))
1125 {
1126         acpi_status status;
1127
1128         if (!device)
1129                 return -EINVAL;
1130
1131         status = acpi_get_data_full(handle, acpi_scan_drop_device,
1132                                     (void **)device, callback);
1133         if (ACPI_FAILURE(status) || !*device) {
1134                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1135                                   handle));
1136                 return -ENODEV;
1137         }
1138         return 0;
1139 }
1140
1141 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1142 {
1143         return acpi_get_device_data(handle, device, NULL);
1144 }
1145 EXPORT_SYMBOL(acpi_bus_get_device);
1146
1147 static void get_acpi_device(void *dev)
1148 {
1149         if (dev)
1150                 get_device(&((struct acpi_device *)dev)->dev);
1151 }
1152
1153 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
1154 {
1155         struct acpi_device *adev = NULL;
1156
1157         acpi_get_device_data(handle, &adev, get_acpi_device);
1158         return adev;
1159 }
1160
1161 void acpi_bus_put_acpi_device(struct acpi_device *adev)
1162 {
1163         put_device(&adev->dev);
1164 }
1165
1166 int acpi_device_add(struct acpi_device *device,
1167                     void (*release)(struct device *))
1168 {
1169         int result;
1170         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1171         int found = 0;
1172
1173         if (device->handle) {
1174                 acpi_status status;
1175
1176                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1177                                           device);
1178                 if (ACPI_FAILURE(status)) {
1179                         acpi_handle_err(device->handle,
1180                                         "Unable to attach device data\n");
1181                         return -ENODEV;
1182                 }
1183         }
1184
1185         /*
1186          * Linkage
1187          * -------
1188          * Link this device to its parent and siblings.
1189          */
1190         INIT_LIST_HEAD(&device->children);
1191         INIT_LIST_HEAD(&device->node);
1192         INIT_LIST_HEAD(&device->wakeup_list);
1193         INIT_LIST_HEAD(&device->physical_node_list);
1194         INIT_LIST_HEAD(&device->del_list);
1195         mutex_init(&device->physical_node_lock);
1196
1197         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1198         if (!new_bus_id) {
1199                 pr_err(PREFIX "Memory allocation error\n");
1200                 result = -ENOMEM;
1201                 goto err_detach;
1202         }
1203
1204         mutex_lock(&acpi_device_lock);
1205         /*
1206          * Find suitable bus_id and instance number in acpi_bus_id_list
1207          * If failed, create one and link it into acpi_bus_id_list
1208          */
1209         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1210                 if (!strcmp(acpi_device_bus_id->bus_id,
1211                             acpi_device_hid(device))) {
1212                         acpi_device_bus_id->instance_no++;
1213                         found = 1;
1214                         kfree(new_bus_id);
1215                         break;
1216                 }
1217         }
1218         if (!found) {
1219                 acpi_device_bus_id = new_bus_id;
1220                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1221                 acpi_device_bus_id->instance_no = 0;
1222                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1223         }
1224         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1225
1226         if (device->parent)
1227                 list_add_tail(&device->node, &device->parent->children);
1228
1229         if (device->wakeup.flags.valid)
1230                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1231         mutex_unlock(&acpi_device_lock);
1232
1233         if (device->parent)
1234                 device->dev.parent = &device->parent->dev;
1235         device->dev.bus = &acpi_bus_type;
1236         device->dev.release = release;
1237         result = device_add(&device->dev);
1238         if (result) {
1239                 dev_err(&device->dev, "Error registering device\n");
1240                 goto err;
1241         }
1242
1243         result = acpi_device_setup_files(device);
1244         if (result)
1245                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1246                        dev_name(&device->dev));
1247
1248         return 0;
1249
1250  err:
1251         mutex_lock(&acpi_device_lock);
1252         if (device->parent)
1253                 list_del(&device->node);
1254         list_del(&device->wakeup_list);
1255         mutex_unlock(&acpi_device_lock);
1256
1257  err_detach:
1258         acpi_detach_data(device->handle, acpi_scan_drop_device);
1259         return result;
1260 }
1261
1262 /* --------------------------------------------------------------------------
1263                                  Driver Management
1264    -------------------------------------------------------------------------- */
1265 /**
1266  * acpi_bus_register_driver - register a driver with the ACPI bus
1267  * @driver: driver being registered
1268  *
1269  * Registers a driver with the ACPI bus.  Searches the namespace for all
1270  * devices that match the driver's criteria and binds.  Returns zero for
1271  * success or a negative error status for failure.
1272  */
1273 int acpi_bus_register_driver(struct acpi_driver *driver)
1274 {
1275         int ret;
1276
1277         if (acpi_disabled)
1278                 return -ENODEV;
1279         driver->drv.name = driver->name;
1280         driver->drv.bus = &acpi_bus_type;
1281         driver->drv.owner = driver->owner;
1282
1283         ret = driver_register(&driver->drv);
1284         return ret;
1285 }
1286
1287 EXPORT_SYMBOL(acpi_bus_register_driver);
1288
1289 /**
1290  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1291  * @driver: driver to unregister
1292  *
1293  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
1294  * devices that match the driver's criteria and unbinds.
1295  */
1296 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1297 {
1298         driver_unregister(&driver->drv);
1299 }
1300
1301 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1302
1303 /* --------------------------------------------------------------------------
1304                                  Device Enumeration
1305    -------------------------------------------------------------------------- */
1306 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1307 {
1308         struct acpi_device *device = NULL;
1309         acpi_status status;
1310
1311         /*
1312          * Fixed hardware devices do not appear in the namespace and do not
1313          * have handles, but we fabricate acpi_devices for them, so we have
1314          * to deal with them specially.
1315          */
1316         if (!handle)
1317                 return acpi_root;
1318
1319         do {
1320                 status = acpi_get_parent(handle, &handle);
1321                 if (ACPI_FAILURE(status))
1322                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
1323         } while (acpi_bus_get_device(handle, &device));
1324         return device;
1325 }
1326
1327 acpi_status
1328 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1329 {
1330         acpi_status status;
1331         acpi_handle tmp;
1332         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1333         union acpi_object *obj;
1334
1335         status = acpi_get_handle(handle, "_EJD", &tmp);
1336         if (ACPI_FAILURE(status))
1337                 return status;
1338
1339         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1340         if (ACPI_SUCCESS(status)) {
1341                 obj = buffer.pointer;
1342                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1343                                          ejd);
1344                 kfree(buffer.pointer);
1345         }
1346         return status;
1347 }
1348 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1349
1350 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1351                                         struct acpi_device_wakeup *wakeup)
1352 {
1353         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1354         union acpi_object *package = NULL;
1355         union acpi_object *element = NULL;
1356         acpi_status status;
1357         int err = -ENODATA;
1358
1359         if (!wakeup)
1360                 return -EINVAL;
1361
1362         INIT_LIST_HEAD(&wakeup->resources);
1363
1364         /* _PRW */
1365         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1366         if (ACPI_FAILURE(status)) {
1367                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1368                 return err;
1369         }
1370
1371         package = (union acpi_object *)buffer.pointer;
1372
1373         if (!package || package->package.count < 2)
1374                 goto out;
1375
1376         element = &(package->package.elements[0]);
1377         if (!element)
1378                 goto out;
1379
1380         if (element->type == ACPI_TYPE_PACKAGE) {
1381                 if ((element->package.count < 2) ||
1382                     (element->package.elements[0].type !=
1383                      ACPI_TYPE_LOCAL_REFERENCE)
1384                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1385                         goto out;
1386
1387                 wakeup->gpe_device =
1388                     element->package.elements[0].reference.handle;
1389                 wakeup->gpe_number =
1390                     (u32) element->package.elements[1].integer.value;
1391         } else if (element->type == ACPI_TYPE_INTEGER) {
1392                 wakeup->gpe_device = NULL;
1393                 wakeup->gpe_number = element->integer.value;
1394         } else {
1395                 goto out;
1396         }
1397
1398         element = &(package->package.elements[1]);
1399         if (element->type != ACPI_TYPE_INTEGER)
1400                 goto out;
1401
1402         wakeup->sleep_state = element->integer.value;
1403
1404         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1405         if (err)
1406                 goto out;
1407
1408         if (!list_empty(&wakeup->resources)) {
1409                 int sleep_state;
1410
1411                 err = acpi_power_wakeup_list_init(&wakeup->resources,
1412                                                   &sleep_state);
1413                 if (err) {
1414                         acpi_handle_warn(handle, "Retrieving current states "
1415                                          "of wakeup power resources failed\n");
1416                         acpi_power_resources_list_free(&wakeup->resources);
1417                         goto out;
1418                 }
1419                 if (sleep_state < wakeup->sleep_state) {
1420                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
1421                                          "(S%d) by S%d from power resources\n",
1422                                          (int)wakeup->sleep_state, sleep_state);
1423                         wakeup->sleep_state = sleep_state;
1424                 }
1425         }
1426
1427  out:
1428         kfree(buffer.pointer);
1429         return err;
1430 }
1431
1432 static void acpi_wakeup_gpe_init(struct acpi_device *device)
1433 {
1434         struct acpi_device_id button_device_ids[] = {
1435                 {"PNP0C0C", 0},
1436                 {"PNP0C0D", 0},
1437                 {"PNP0C0E", 0},
1438                 {"", 0},
1439         };
1440         struct acpi_device_wakeup *wakeup = &device->wakeup;
1441         acpi_status status;
1442         acpi_event_status event_status;
1443
1444         wakeup->flags.notifier_present = 0;
1445
1446         /* Power button, Lid switch always enable wakeup */
1447         if (!acpi_match_device_ids(device, button_device_ids)) {
1448                 wakeup->flags.run_wake = 1;
1449                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1450                         /* Do not use Lid/sleep button for S5 wakeup */
1451                         if (wakeup->sleep_state == ACPI_STATE_S5)
1452                                 wakeup->sleep_state = ACPI_STATE_S4;
1453                 }
1454                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
1455                 device_set_wakeup_capable(&device->dev, true);
1456                 return;
1457         }
1458
1459         acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
1460                                 wakeup->gpe_number);
1461         status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
1462                                      &event_status);
1463         if (ACPI_FAILURE(status))
1464                 return;
1465
1466         wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1467 }
1468
1469 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1470 {
1471         int err;
1472
1473         /* Presence of _PRW indicates wake capable */
1474         if (!acpi_has_method(device->handle, "_PRW"))
1475                 return;
1476
1477         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1478                                                            &device->wakeup);
1479         if (err) {
1480                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1481                 return;
1482         }
1483
1484         device->wakeup.flags.valid = 1;
1485         device->wakeup.prepare_count = 0;
1486         acpi_wakeup_gpe_init(device);
1487         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1488          * system for the ACPI device with the _PRW object.
1489          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1490          * So it is necessary to call _DSW object first. Only when it is not
1491          * present will the _PSW object used.
1492          */
1493         err = acpi_device_sleep_wake(device, 0, 0, 0);
1494         if (err)
1495                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1496                                 "error in _DSW or _PSW evaluation\n"));
1497 }
1498
1499 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1500 {
1501         struct acpi_device_power_state *ps = &device->power.states[state];
1502         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1503         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1504         acpi_status status;
1505
1506         INIT_LIST_HEAD(&ps->resources);
1507
1508         /* Evaluate "_PRx" to get referenced power resources */
1509         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1510         if (ACPI_SUCCESS(status)) {
1511                 union acpi_object *package = buffer.pointer;
1512
1513                 if (buffer.length && package
1514                     && package->type == ACPI_TYPE_PACKAGE
1515                     && package->package.count) {
1516                         int err = acpi_extract_power_resources(package, 0,
1517                                                                &ps->resources);
1518                         if (!err)
1519                                 device->power.flags.power_resources = 1;
1520                 }
1521                 ACPI_FREE(buffer.pointer);
1522         }
1523
1524         /* Evaluate "_PSx" to see if we can do explicit sets */
1525         pathname[2] = 'S';
1526         if (acpi_has_method(device->handle, pathname))
1527                 ps->flags.explicit_set = 1;
1528
1529         /*
1530          * State is valid if there are means to put the device into it.
1531          * D3hot is only valid if _PR3 present.
1532          */
1533         if (!list_empty(&ps->resources)
1534             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1535                 ps->flags.valid = 1;
1536                 ps->flags.os_accessible = 1;
1537         }
1538
1539         ps->power = -1;         /* Unknown - driver assigned */
1540         ps->latency = -1;       /* Unknown - driver assigned */
1541 }
1542
1543 static void acpi_bus_get_power_flags(struct acpi_device *device)
1544 {
1545         u32 i;
1546
1547         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1548         if (!acpi_has_method(device->handle, "_PS0") &&
1549             !acpi_has_method(device->handle, "_PR0"))
1550                 return;
1551
1552         device->flags.power_manageable = 1;
1553
1554         /*
1555          * Power Management Flags
1556          */
1557         if (acpi_has_method(device->handle, "_PSC"))
1558                 device->power.flags.explicit_get = 1;
1559
1560         if (acpi_has_method(device->handle, "_IRC"))
1561                 device->power.flags.inrush_current = 1;
1562
1563         if (acpi_has_method(device->handle, "_DSW"))
1564                 device->power.flags.dsw_present = 1;
1565
1566         /*
1567          * Enumerate supported power management states
1568          */
1569         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1570                 acpi_bus_init_power_state(device, i);
1571
1572         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1573
1574         /* Set defaults for D0 and D3 states (always valid) */
1575         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1576         device->power.states[ACPI_STATE_D0].power = 100;
1577         device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1578         device->power.states[ACPI_STATE_D3_COLD].power = 0;
1579
1580         /* Set D3cold's explicit_set flag if _PS3 exists. */
1581         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1582                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1583
1584         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1585         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1586                         device->power.flags.power_resources)
1587                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1588
1589         if (acpi_bus_init_power(device)) {
1590                 acpi_free_power_resources_lists(device);
1591                 device->flags.power_manageable = 0;
1592         }
1593 }
1594
1595 static void acpi_bus_get_flags(struct acpi_device *device)
1596 {
1597         /* Presence of _STA indicates 'dynamic_status' */
1598         if (acpi_has_method(device->handle, "_STA"))
1599                 device->flags.dynamic_status = 1;
1600
1601         /* Presence of _RMV indicates 'removable' */
1602         if (acpi_has_method(device->handle, "_RMV"))
1603                 device->flags.removable = 1;
1604
1605         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1606         if (acpi_has_method(device->handle, "_EJD") ||
1607             acpi_has_method(device->handle, "_EJ0"))
1608                 device->flags.ejectable = 1;
1609 }
1610
1611 static void acpi_device_get_busid(struct acpi_device *device)
1612 {
1613         char bus_id[5] = { '?', 0 };
1614         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1615         int i = 0;
1616
1617         /*
1618          * Bus ID
1619          * ------
1620          * The device's Bus ID is simply the object name.
1621          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1622          */
1623         if (ACPI_IS_ROOT_DEVICE(device)) {
1624                 strcpy(device->pnp.bus_id, "ACPI");
1625                 return;
1626         }
1627
1628         switch (device->device_type) {
1629         case ACPI_BUS_TYPE_POWER_BUTTON:
1630                 strcpy(device->pnp.bus_id, "PWRF");
1631                 break;
1632         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1633                 strcpy(device->pnp.bus_id, "SLPF");
1634                 break;
1635         default:
1636                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1637                 /* Clean up trailing underscores (if any) */
1638                 for (i = 3; i > 1; i--) {
1639                         if (bus_id[i] == '_')
1640                                 bus_id[i] = '\0';
1641                         else
1642                                 break;
1643                 }
1644                 strcpy(device->pnp.bus_id, bus_id);
1645                 break;
1646         }
1647 }
1648
1649 /*
1650  * acpi_ata_match - see if an acpi object is an ATA device
1651  *
1652  * If an acpi object has one of the ACPI ATA methods defined,
1653  * then we can safely call it an ATA device.
1654  */
1655 bool acpi_ata_match(acpi_handle handle)
1656 {
1657         return acpi_has_method(handle, "_GTF") ||
1658                acpi_has_method(handle, "_GTM") ||
1659                acpi_has_method(handle, "_STM") ||
1660                acpi_has_method(handle, "_SDD");
1661 }
1662
1663 /*
1664  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1665  *
1666  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1667  * then we can safely call it an ejectable drive bay
1668  */
1669 bool acpi_bay_match(acpi_handle handle)
1670 {
1671         acpi_handle phandle;
1672
1673         if (!acpi_has_method(handle, "_EJ0"))
1674                 return false;
1675         if (acpi_ata_match(handle))
1676                 return true;
1677         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1678                 return false;
1679
1680         return acpi_ata_match(phandle);
1681 }
1682
1683 bool acpi_device_is_battery(struct acpi_device *adev)
1684 {
1685         struct acpi_hardware_id *hwid;
1686
1687         list_for_each_entry(hwid, &adev->pnp.ids, list)
1688                 if (!strcmp("PNP0C0A", hwid->id))
1689                         return true;
1690
1691         return false;
1692 }
1693
1694 static bool is_ejectable_bay(struct acpi_device *adev)
1695 {
1696         acpi_handle handle = adev->handle;
1697
1698         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1699                 return true;
1700
1701         return acpi_bay_match(handle);
1702 }
1703
1704 /*
1705  * acpi_dock_match - see if an acpi object has a _DCK method
1706  */
1707 bool acpi_dock_match(acpi_handle handle)
1708 {
1709         return acpi_has_method(handle, "_DCK");
1710 }
1711
1712 const char *acpi_device_hid(struct acpi_device *device)
1713 {
1714         struct acpi_hardware_id *hid;
1715
1716         if (list_empty(&device->pnp.ids))
1717                 return dummy_hid;
1718
1719         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1720         return hid->id;
1721 }
1722 EXPORT_SYMBOL(acpi_device_hid);
1723
1724 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1725 {
1726         struct acpi_hardware_id *id;
1727
1728         id = kmalloc(sizeof(*id), GFP_KERNEL);
1729         if (!id)
1730                 return;
1731
1732         id->id = kstrdup(dev_id, GFP_KERNEL);
1733         if (!id->id) {
1734                 kfree(id);
1735                 return;
1736         }
1737
1738         list_add_tail(&id->list, &pnp->ids);
1739         pnp->type.hardware_id = 1;
1740 }
1741
1742 /*
1743  * Old IBM workstations have a DSDT bug wherein the SMBus object
1744  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1745  * prefix.  Work around this.
1746  */
1747 static bool acpi_ibm_smbus_match(acpi_handle handle)
1748 {
1749         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1750         struct acpi_buffer path = { sizeof(node_name), node_name };
1751
1752         if (!dmi_name_in_vendors("IBM"))
1753                 return false;
1754
1755         /* Look for SMBS object */
1756         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1757             strcmp("SMBS", path.pointer))
1758                 return false;
1759
1760         /* Does it have the necessary (but misnamed) methods? */
1761         if (acpi_has_method(handle, "SBI") &&
1762             acpi_has_method(handle, "SBR") &&
1763             acpi_has_method(handle, "SBW"))
1764                 return true;
1765
1766         return false;
1767 }
1768
1769 static bool acpi_object_is_system_bus(acpi_handle handle)
1770 {
1771         acpi_handle tmp;
1772
1773         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1774             tmp == handle)
1775                 return true;
1776         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1777             tmp == handle)
1778                 return true;
1779
1780         return false;
1781 }
1782
1783 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1784                                 int device_type)
1785 {
1786         acpi_status status;
1787         struct acpi_device_info *info;
1788         struct acpi_pnp_device_id_list *cid_list;
1789         int i;
1790
1791         switch (device_type) {
1792         case ACPI_BUS_TYPE_DEVICE:
1793                 if (handle == ACPI_ROOT_OBJECT) {
1794                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1795                         break;
1796                 }
1797
1798                 status = acpi_get_object_info(handle, &info);
1799                 if (ACPI_FAILURE(status)) {
1800                         pr_err(PREFIX "%s: Error reading device info\n",
1801                                         __func__);
1802                         return;
1803                 }
1804
1805                 if (info->valid & ACPI_VALID_HID) {
1806                         acpi_add_id(pnp, info->hardware_id.string);
1807                         pnp->type.platform_id = 1;
1808                 }
1809                 if (info->valid & ACPI_VALID_CID) {
1810                         cid_list = &info->compatible_id_list;
1811                         for (i = 0; i < cid_list->count; i++)
1812                                 acpi_add_id(pnp, cid_list->ids[i].string);
1813                 }
1814                 if (info->valid & ACPI_VALID_ADR) {
1815                         pnp->bus_address = info->address;
1816                         pnp->type.bus_address = 1;
1817                 }
1818                 if (info->valid & ACPI_VALID_UID)
1819                         pnp->unique_id = kstrdup(info->unique_id.string,
1820                                                         GFP_KERNEL);
1821
1822                 kfree(info);
1823
1824                 /*
1825                  * Some devices don't reliably have _HIDs & _CIDs, so add
1826                  * synthetic HIDs to make sure drivers can find them.
1827                  */
1828                 if (acpi_is_video_device(handle))
1829                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1830                 else if (acpi_bay_match(handle))
1831                         acpi_add_id(pnp, ACPI_BAY_HID);
1832                 else if (acpi_dock_match(handle))
1833                         acpi_add_id(pnp, ACPI_DOCK_HID);
1834                 else if (acpi_ibm_smbus_match(handle))
1835                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1836                 else if (list_empty(&pnp->ids) &&
1837                          acpi_object_is_system_bus(handle)) {
1838                         /* \_SB, \_TZ, LNXSYBUS */
1839                         acpi_add_id(pnp, ACPI_BUS_HID);
1840                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1841                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1842                 }
1843
1844                 break;
1845         case ACPI_BUS_TYPE_POWER:
1846                 acpi_add_id(pnp, ACPI_POWER_HID);
1847                 break;
1848         case ACPI_BUS_TYPE_PROCESSOR:
1849                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1850                 break;
1851         case ACPI_BUS_TYPE_THERMAL:
1852                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1853                 break;
1854         case ACPI_BUS_TYPE_POWER_BUTTON:
1855                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1856                 break;
1857         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1858                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1859                 break;
1860         }
1861 }
1862
1863 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1864 {
1865         struct acpi_hardware_id *id, *tmp;
1866
1867         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1868                 kfree(id->id);
1869                 kfree(id);
1870         }
1871         kfree(pnp->unique_id);
1872 }
1873
1874 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1875                              int type, unsigned long long sta)
1876 {
1877         INIT_LIST_HEAD(&device->pnp.ids);
1878         device->device_type = type;
1879         device->handle = handle;
1880         device->parent = acpi_bus_get_parent(handle);
1881         acpi_set_device_status(device, sta);
1882         acpi_device_get_busid(device);
1883         acpi_set_pnp_ids(handle, &device->pnp, type);
1884         acpi_bus_get_flags(device);
1885         device->flags.match_driver = false;
1886         device->flags.initialized = true;
1887         device->flags.visited = false;
1888         device_initialize(&device->dev);
1889         dev_set_uevent_suppress(&device->dev, true);
1890 }
1891
1892 void acpi_device_add_finalize(struct acpi_device *device)
1893 {
1894         dev_set_uevent_suppress(&device->dev, false);
1895         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1896 }
1897
1898 static int acpi_add_single_object(struct acpi_device **child,
1899                                   acpi_handle handle, int type,
1900                                   unsigned long long sta)
1901 {
1902         int result;
1903         struct acpi_device *device;
1904         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1905
1906         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1907         if (!device) {
1908                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1909                 return -ENOMEM;
1910         }
1911
1912         acpi_init_device_object(device, handle, type, sta);
1913         acpi_bus_get_power_flags(device);
1914         acpi_bus_get_wakeup_device_flags(device);
1915
1916         result = acpi_device_add(device, acpi_device_release);
1917         if (result) {
1918                 acpi_device_release(&device->dev);
1919                 return result;
1920         }
1921
1922         acpi_power_add_remove_device(device, true);
1923         acpi_device_add_finalize(device);
1924         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1925         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1926                 dev_name(&device->dev), (char *) buffer.pointer,
1927                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1928         kfree(buffer.pointer);
1929         *child = device;
1930         return 0;
1931 }
1932
1933 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1934                                     unsigned long long *sta)
1935 {
1936         acpi_status status;
1937         acpi_object_type acpi_type;
1938
1939         status = acpi_get_type(handle, &acpi_type);
1940         if (ACPI_FAILURE(status))
1941                 return -ENODEV;
1942
1943         switch (acpi_type) {
1944         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1945         case ACPI_TYPE_DEVICE:
1946                 *type = ACPI_BUS_TYPE_DEVICE;
1947                 status = acpi_bus_get_status_handle(handle, sta);
1948                 if (ACPI_FAILURE(status))
1949                         return -ENODEV;
1950                 break;
1951         case ACPI_TYPE_PROCESSOR:
1952                 *type = ACPI_BUS_TYPE_PROCESSOR;
1953                 status = acpi_bus_get_status_handle(handle, sta);
1954                 if (ACPI_FAILURE(status))
1955                         return -ENODEV;
1956                 break;
1957         case ACPI_TYPE_THERMAL:
1958                 *type = ACPI_BUS_TYPE_THERMAL;
1959                 *sta = ACPI_STA_DEFAULT;
1960                 break;
1961         case ACPI_TYPE_POWER:
1962                 *type = ACPI_BUS_TYPE_POWER;
1963                 *sta = ACPI_STA_DEFAULT;
1964                 break;
1965         default:
1966                 return -ENODEV;
1967         }
1968
1969         return 0;
1970 }
1971
1972 bool acpi_device_is_present(struct acpi_device *adev)
1973 {
1974         if (adev->status.present || adev->status.functional)
1975                 return true;
1976
1977         adev->flags.initialized = false;
1978         return false;
1979 }
1980
1981 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1982                                        char *idstr,
1983                                        const struct acpi_device_id **matchid)
1984 {
1985         const struct acpi_device_id *devid;
1986
1987         if (handler->match)
1988                 return handler->match(idstr, matchid);
1989
1990         for (devid = handler->ids; devid->id[0]; devid++)
1991                 if (!strcmp((char *)devid->id, idstr)) {
1992                         if (matchid)
1993                                 *matchid = devid;
1994
1995                         return true;
1996                 }
1997
1998         return false;
1999 }
2000
2001 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
2002                                         const struct acpi_device_id **matchid)
2003 {
2004         struct acpi_scan_handler *handler;
2005
2006         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
2007                 if (acpi_scan_handler_matching(handler, idstr, matchid))
2008                         return handler;
2009
2010         return NULL;
2011 }
2012
2013 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2014 {
2015         if (!!hotplug->enabled == !!val)
2016                 return;
2017
2018         mutex_lock(&acpi_scan_lock);
2019
2020         hotplug->enabled = val;
2021
2022         mutex_unlock(&acpi_scan_lock);
2023 }
2024
2025 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2026 {
2027         struct acpi_hardware_id *hwid;
2028
2029         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2030                 acpi_dock_add(adev);
2031                 return;
2032         }
2033         list_for_each_entry(hwid, &adev->pnp.ids, list) {
2034                 struct acpi_scan_handler *handler;
2035
2036                 handler = acpi_scan_match_handler(hwid->id, NULL);
2037                 if (handler) {
2038                         adev->flags.hotplug_notify = true;
2039                         break;
2040                 }
2041         }
2042 }
2043
2044 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2045                                       void *not_used, void **return_value)
2046 {
2047         struct acpi_device *device = NULL;
2048         int type;
2049         unsigned long long sta;
2050         int result;
2051
2052         acpi_bus_get_device(handle, &device);
2053         if (device)
2054                 goto out;
2055
2056         result = acpi_bus_type_and_status(handle, &type, &sta);
2057         if (result)
2058                 return AE_OK;
2059
2060         if (type == ACPI_BUS_TYPE_POWER) {
2061                 acpi_add_power_resource(handle);
2062                 return AE_OK;
2063         }
2064
2065         acpi_add_single_object(&device, handle, type, sta);
2066         if (!device)
2067                 return AE_CTRL_DEPTH;
2068
2069         acpi_scan_init_hotplug(device);
2070
2071  out:
2072         if (!*return_value)
2073                 *return_value = device;
2074
2075         return AE_OK;
2076 }
2077
2078 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
2079 {
2080         bool *is_spi_i2c_slave_p = data;
2081
2082         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
2083                 return 1;
2084
2085         /*
2086          * devices that are connected to UART still need to be enumerated to
2087          * platform bus
2088          */
2089         if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
2090                 *is_spi_i2c_slave_p = true;
2091
2092          /* no need to do more checking */
2093         return -1;
2094 }
2095
2096 static void acpi_default_enumeration(struct acpi_device *device)
2097 {
2098         struct list_head resource_list;
2099         bool is_spi_i2c_slave = false;
2100
2101         if (!device->pnp.type.platform_id || device->handler)
2102                 return;
2103
2104         /*
2105          * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2106          * respective parents.
2107          */
2108         INIT_LIST_HEAD(&resource_list);
2109         acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
2110                                &is_spi_i2c_slave);
2111         acpi_dev_free_resource_list(&resource_list);
2112         if (!is_spi_i2c_slave)
2113                 acpi_create_platform_device(device);
2114 }
2115
2116 static int acpi_scan_attach_handler(struct acpi_device *device)
2117 {
2118         struct acpi_hardware_id *hwid;
2119         int ret = 0;
2120
2121         list_for_each_entry(hwid, &device->pnp.ids, list) {
2122                 const struct acpi_device_id *devid;
2123                 struct acpi_scan_handler *handler;
2124
2125                 handler = acpi_scan_match_handler(hwid->id, &devid);
2126                 if (handler) {
2127                         if (!handler->attach) {
2128                                 device->pnp.type.platform_id = 0;
2129                                 continue;
2130                         }
2131                         device->handler = handler;
2132                         ret = handler->attach(device, devid);
2133                         if (ret > 0)
2134                                 break;
2135
2136                         device->handler = NULL;
2137                         if (ret < 0)
2138                                 break;
2139                 }
2140         }
2141         if (!ret)
2142                 acpi_default_enumeration(device);
2143
2144         return ret;
2145 }
2146
2147 static void acpi_bus_attach(struct acpi_device *device)
2148 {
2149         struct acpi_device *child;
2150         acpi_handle ejd;
2151         int ret;
2152
2153         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2154                 register_dock_dependent_device(device, ejd);
2155
2156         acpi_bus_get_status(device);
2157         /* Skip devices that are not present. */
2158         if (!acpi_device_is_present(device)) {
2159                 device->flags.visited = false;
2160                 return;
2161         }
2162         if (device->handler)
2163                 goto ok;
2164
2165         if (!device->flags.initialized) {
2166                 acpi_bus_update_power(device, NULL);
2167                 device->flags.initialized = true;
2168         }
2169         device->flags.visited = false;
2170         ret = acpi_scan_attach_handler(device);
2171         if (ret < 0)
2172                 return;
2173
2174         device->flags.match_driver = true;
2175         if (!ret) {
2176                 ret = device_attach(&device->dev);
2177                 if (ret < 0)
2178                         return;
2179         }
2180         device->flags.visited = true;
2181
2182  ok:
2183         list_for_each_entry(child, &device->children, node)
2184                 acpi_bus_attach(child);
2185 }
2186
2187 /**
2188  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2189  * @handle: Root of the namespace scope to scan.
2190  *
2191  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2192  * found devices.
2193  *
2194  * If no devices were found, -ENODEV is returned, but it does not mean that
2195  * there has been a real error.  There just have been no suitable ACPI objects
2196  * in the table trunk from which the kernel could create a device and add an
2197  * appropriate driver.
2198  *
2199  * Must be called under acpi_scan_lock.
2200  */
2201 int acpi_bus_scan(acpi_handle handle)
2202 {
2203         void *device = NULL;
2204
2205         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2206                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2207                                     acpi_bus_check_add, NULL, NULL, &device);
2208
2209         if (device) {
2210                 acpi_bus_attach(device);
2211                 return 0;
2212         }
2213         return -ENODEV;
2214 }
2215 EXPORT_SYMBOL(acpi_bus_scan);
2216
2217 /**
2218  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2219  * @adev: Root of the ACPI namespace scope to walk.
2220  *
2221  * Must be called under acpi_scan_lock.
2222  */
2223 void acpi_bus_trim(struct acpi_device *adev)
2224 {
2225         struct acpi_scan_handler *handler = adev->handler;
2226         struct acpi_device *child;
2227
2228         list_for_each_entry_reverse(child, &adev->children, node)
2229                 acpi_bus_trim(child);
2230
2231         adev->flags.match_driver = false;
2232         if (handler) {
2233                 if (handler->detach)
2234                         handler->detach(adev);
2235
2236                 adev->handler = NULL;
2237         } else {
2238                 device_release_driver(&adev->dev);
2239         }
2240         /*
2241          * Most likely, the device is going away, so put it into D3cold before
2242          * that.
2243          */
2244         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2245         adev->flags.initialized = false;
2246         adev->flags.visited = false;
2247 }
2248 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2249
2250 static int acpi_bus_scan_fixed(void)
2251 {
2252         int result = 0;
2253
2254         /*
2255          * Enumerate all fixed-feature devices.
2256          */
2257         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2258                 struct acpi_device *device = NULL;
2259
2260                 result = acpi_add_single_object(&device, NULL,
2261                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2262                                                 ACPI_STA_DEFAULT);
2263                 if (result)
2264                         return result;
2265
2266                 device->flags.match_driver = true;
2267                 result = device_attach(&device->dev);
2268                 if (result < 0)
2269                         return result;
2270
2271                 device_init_wakeup(&device->dev, true);
2272         }
2273
2274         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2275                 struct acpi_device *device = NULL;
2276
2277                 result = acpi_add_single_object(&device, NULL,
2278                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2279                                                 ACPI_STA_DEFAULT);
2280                 if (result)
2281                         return result;
2282
2283                 device->flags.match_driver = true;
2284                 result = device_attach(&device->dev);
2285         }
2286
2287         return result < 0 ? result : 0;
2288 }
2289
2290 int __init acpi_scan_init(void)
2291 {
2292         int result;
2293
2294         result = bus_register(&acpi_bus_type);
2295         if (result) {
2296                 /* We don't want to quit even if we failed to add suspend/resume */
2297                 printk(KERN_ERR PREFIX "Could not register bus type\n");
2298         }
2299
2300         acpi_pci_root_init();
2301         acpi_pci_link_init();
2302         acpi_processor_init();
2303         acpi_lpss_init();
2304         acpi_cmos_rtc_init();
2305         acpi_container_init();
2306         acpi_memory_hotplug_init();
2307         acpi_pnp_init();
2308
2309         mutex_lock(&acpi_scan_lock);
2310         /*
2311          * Enumerate devices in the ACPI namespace.
2312          */
2313         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2314         if (result)
2315                 goto out;
2316
2317         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2318         if (result)
2319                 goto out;
2320
2321         /* Fixed feature devices do not exist on HW-reduced platform */
2322         if (!acpi_gbl_reduced_hardware) {
2323                 result = acpi_bus_scan_fixed();
2324                 if (result) {
2325                         acpi_detach_data(acpi_root->handle,
2326                                          acpi_scan_drop_device);
2327                         acpi_device_del(acpi_root);
2328                         put_device(&acpi_root->dev);
2329                         goto out;
2330                 }
2331         }
2332
2333         acpi_update_all_gpes();
2334
2335  out:
2336         mutex_unlock(&acpi_scan_lock);
2337         return result;
2338 }