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