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 && device->handler->hotplug.demand_offline
 357             && !acpi_force_hot_remove) {
 358                 if (!acpi_scan_is_offline(device, true))
 359                         return -EBUSY;
 360         } else {
 361                 int error = acpi_scan_try_to_offline(device);
 362                 if (error)
 363                         return error;
 364         }
 365
 366         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 367                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 368
 369         acpi_bus_trim(device);
 370
 371         acpi_evaluate_lck(handle, 0);
 372         /*
 373          * TBD: _EJD support.
 374          */
 375         status = acpi_evaluate_ej0(handle);
 376         if (status == AE_NOT_FOUND)
 377                 return -ENODEV;
 378         else if (ACPI_FAILURE(status))
 379                 return -EIO;
 380
 381         /*
 382          * Verify if eject was indeed successful.  If not, log an error
 383          * message.  No need to call _OST since _EJ0 call was made OK.
 384          */
 385         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 386         if (ACPI_FAILURE(status)) {
 387                 acpi_handle_warn(handle,
 388                         "Status check after eject failed (0x%x)\n", status);
 389         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 390                 acpi_handle_warn(handle,
 391                         "Eject incomplete - status 0x%llx\n", sta);
 392         }
 393
 394         return 0;
 395 }
 396
 397 static int acpi_scan_device_not_present(struct acpi_device *adev)
 398 {
 399         if (!acpi_device_enumerated(adev)) {
 400                 dev_warn(&adev->dev, "Still not present\n");
 401                 return -EALREADY;
 402         }
 403         acpi_bus_trim(adev);
 404         return 0;
 405 }
 406
 407 static int acpi_scan_device_check(struct acpi_device *adev)
 408 {
 409         int error;
 410
 411         acpi_bus_get_status(adev);
 412         if (adev->status.present || adev->status.functional) {
 413                 /*
 414                  * This function is only called for device objects for which
 415                  * matching scan handlers exist.  The only situation in which
 416                  * the scan handler is not attached to this device object yet
 417                  * is when the device has just appeared (either it wasn't
 418                  * present at all before or it was removed and then added
 419                  * again).
 420                  */
 421                 if (adev->handler) {
 422                         dev_warn(&adev->dev, "Already enumerated\n");
 423                         return -EALREADY;
 424                 }
 425                 error = acpi_bus_scan(adev->handle);
 426                 if (error) {
 427                         dev_warn(&adev->dev, "Namespace scan failure\n");
 428                         return error;
 429                 }
 430                 if (!adev->handler) {
 431                         dev_warn(&adev->dev, "Enumeration failure\n");
 432                         error = -ENODEV;
 433                 }
 434         } else {
 435                 error = acpi_scan_device_not_present(adev);
 436         }
 437         return error;
 438 }
 439
 440 static int acpi_scan_bus_check(struct acpi_device *adev)
 441 {
 442         struct acpi_scan_handler *handler = adev->handler;
 443         struct acpi_device *child;
 444         int error;
 445
 446         acpi_bus_get_status(adev);
 447         if (!(adev->status.present || adev->status.functional)) {
 448                 acpi_scan_device_not_present(adev);
 449                 return 0;
 450         }
 451         if (handler && handler->hotplug.scan_dependent)
 452                 return handler->hotplug.scan_dependent(adev);
 453
 454         error = acpi_bus_scan(adev->handle);
 455         if (error) {
 456                 dev_warn(&adev->dev, "Namespace scan failure\n");
 457                 return error;
 458         }
 459         list_for_each_entry(child, &adev->children, node) {
 460                 error = acpi_scan_bus_check(child);
 461                 if (error)
 462                         return error;
 463         }
 464         return 0;
 465 }
 466
 467 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 468 {
 469         switch (type) {
 470         case ACPI_NOTIFY_BUS_CHECK:
 471                 return acpi_scan_bus_check(adev);
 472         case ACPI_NOTIFY_DEVICE_CHECK:
 473                 return acpi_scan_device_check(adev);
 474         case ACPI_NOTIFY_EJECT_REQUEST:
 475         case ACPI_OST_EC_OSPM_EJECT:
 476                 if (adev->handler && !adev->handler->hotplug.enabled) {
 477                         dev_info(&adev->dev, "Eject disabled\n");
 478                         return -EPERM;
 479                 }
 480                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 481                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 482                 return acpi_scan_hot_remove(adev);
 483         }
 484         return -EINVAL;
 485 }
 486
 487 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 488 {
 489         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 490         int error = -ENODEV;
 491
 492         lock_device_hotplug();
 493         mutex_lock(&acpi_scan_lock);
 494
 495         /*
 496          * The device object's ACPI handle cannot become invalid as long as we
 497          * are holding acpi_scan_lock, but it might have become invalid before
 498          * that lock was acquired.
 499          */
 500         if (adev->handle == INVALID_ACPI_HANDLE)
 501                 goto err_out;
 502
 503         if (adev->flags.is_dock_station) {
 504                 error = dock_notify(adev, src);
 505         } else if (adev->flags.hotplug_notify) {
 506                 error = acpi_generic_hotplug_event(adev, src);
 507                 if (error == -EPERM) {
 508                         ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 509                         goto err_out;
 510                 }
 511         } else {
 512                 int (*notify)(struct acpi_device *, u32);
 513
 514                 acpi_lock_hp_context();
 515                 notify = adev->hp ? adev->hp->notify : NULL;
 516                 acpi_unlock_hp_context();
 517                 /*
 518                  * There may be additional notify handlers for device objects
 519                  * without the .event() callback, so ignore them here.
 520                  */
 521                 if (notify)
 522                         error = notify(adev, src);
 523                 else
 524                         goto out;
 525         }
 526         if (!error)
 527                 ost_code = ACPI_OST_SC_SUCCESS;
 528
 529  err_out:
 530         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 531
 532  out:
 533         acpi_bus_put_acpi_device(adev);
 534         mutex_unlock(&acpi_scan_lock);
 535         unlock_device_hotplug();
 536 }
 537
 538 static ssize_t real_power_state_show(struct device *dev,
 539                                      struct device_attribute *attr, char *buf)
 540 {
 541         struct acpi_device *adev = to_acpi_device(dev);
 542         int state;
 543         int ret;
 544
 545         ret = acpi_device_get_power(adev, &state);
 546         if (ret)
 547                 return ret;
 548
 549         return sprintf(buf, "%s\n", acpi_power_state_string(state));
 550 }
 551
 552 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 553
 554 static ssize_t power_state_show(struct device *dev,
 555                                 struct device_attribute *attr, char *buf)
 556 {
 557         struct acpi_device *adev = to_acpi_device(dev);
 558
 559         return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 560 }
 561
 562 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 563
 564 static ssize_t
 565 acpi_eject_store(struct device *d, struct device_attribute *attr,
 566                 const char *buf, size_t count)
 567 {
 568         struct acpi_device *acpi_device = to_acpi_device(d);
 569         acpi_object_type not_used;
 570         acpi_status status;
 571
 572         if (!count || buf[0] != '1')
 573                 return -EINVAL;
 574
 575         if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
 576             && !acpi_device->driver)
 577                 return -ENODEV;
 578
 579         status = acpi_get_type(acpi_device->handle, &not_used);
 580         if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
 581                 return -ENODEV;
 582
 583         get_device(&acpi_device->dev);
 584         status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
 585         if (ACPI_SUCCESS(status))
 586                 return count;
 587
 588         put_device(&acpi_device->dev);
 589         acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
 590                           ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 591         return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
 592 }
 593
 594 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 595
 596 static ssize_t
 597 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 598         struct acpi_device *acpi_dev = to_acpi_device(dev);
 599
 600         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 601 }
 602 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 603
 604 static ssize_t acpi_device_uid_show(struct device *dev,
 605                                     struct device_attribute *attr, char *buf)
 606 {
 607         struct acpi_device *acpi_dev = to_acpi_device(dev);
 608
 609         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 610 }
 611 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 612
 613 static ssize_t acpi_device_adr_show(struct device *dev,
 614                                     struct device_attribute *attr, char *buf)
 615 {
 616         struct acpi_device *acpi_dev = to_acpi_device(dev);
 617
 618         return sprintf(buf, "0x%08x\n",
 619                        (unsigned int)(acpi_dev->pnp.bus_address));
 620 }
 621 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 622
 623 static ssize_t
 624 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 625         struct acpi_device *acpi_dev = to_acpi_device(dev);
 626         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 627         int result;
 628
 629         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 630         if (result)
 631                 goto end;
 632
 633         result = sprintf(buf, "%s\n", (char*)path.pointer);
 634         kfree(path.pointer);
 635 end:
 636         return result;
 637 }
 638 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 639
 640 /* sysfs file that shows description text from the ACPI _STR method */
 641 static ssize_t description_show(struct device *dev,
 642                                 struct device_attribute *attr,
 643                                 char *buf) {
 644         struct acpi_device *acpi_dev = to_acpi_device(dev);
 645         int result;
 646
 647         if (acpi_dev->pnp.str_obj == NULL)
 648                 return 0;
 649
 650         /*
 651          * The _STR object contains a Unicode identifier for a device.
 652          * We need to convert to utf-8 so it can be displayed.
 653          */
 654         result = utf16s_to_utf8s(
 655                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 656                 acpi_dev->pnp.str_obj->buffer.length,
 657                 UTF16_LITTLE_ENDIAN, buf,
 658                 PAGE_SIZE);
 659
 660         buf[result++] = '\n';
 661
 662         return result;
 663 }
 664 static DEVICE_ATTR(description, 0444, description_show, NULL);
 665
 666 static ssize_t
 667 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 668                      char *buf) {
 669         struct acpi_device *acpi_dev = to_acpi_device(dev);
 670
 671         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 672 }
 673 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 674
 675 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
 676                                 char *buf) {
 677         struct acpi_device *acpi_dev = to_acpi_device(dev);
 678         acpi_status status;
 679         unsigned long long sta;
 680
 681         status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
 682         if (ACPI_FAILURE(status))
 683                 return -ENODEV;
 684
 685         return sprintf(buf, "%llu\n", sta);
 686 }
 687 static DEVICE_ATTR_RO(status);
 688
 689 static int acpi_device_setup_files(struct acpi_device *dev)
 690 {
 691         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 692         acpi_status status;
 693         unsigned long long sun;
 694         int result = 0;
 695
 696         /*
 697          * Devices gotten from FADT don't have a "path" attribute
 698          */
 699         if (dev->handle) {
 700                 result = device_create_file(&dev->dev, &dev_attr_path);
 701                 if (result)
 702                         goto end;
 703         }
 704
 705         if (!list_empty(&dev->pnp.ids)) {
 706                 result = device_create_file(&dev->dev, &dev_attr_hid);
 707                 if (result)
 708                         goto end;
 709
 710                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 711                 if (result)
 712                         goto end;
 713         }
 714
 715         /*
 716          * If device has _STR, 'description' file is created
 717          */
 718         if (acpi_has_method(dev->handle, "_STR")) {
 719                 status = acpi_evaluate_object(dev->handle, "_STR",
 720                                         NULL, &buffer);
 721                 if (ACPI_FAILURE(status))
 722                         buffer.pointer = NULL;
 723                 dev->pnp.str_obj = buffer.pointer;
 724                 result = device_create_file(&dev->dev, &dev_attr_description);
 725                 if (result)
 726                         goto end;
 727         }
 728
 729         if (dev->pnp.type.bus_address)
 730                 result = device_create_file(&dev->dev, &dev_attr_adr);
 731         if (dev->pnp.unique_id)
 732                 result = device_create_file(&dev->dev, &dev_attr_uid);
 733
 734         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 735         if (ACPI_SUCCESS(status)) {
 736                 dev->pnp.sun = (unsigned long)sun;
 737                 result = device_create_file(&dev->dev, &dev_attr_sun);
 738                 if (result)
 739                         goto end;
 740         } else {
 741                 dev->pnp.sun = (unsigned long)-1;
 742         }
 743
 744         if (acpi_has_method(dev->handle, "_STA")) {
 745                 result = device_create_file(&dev->dev, &dev_attr_status);
 746                 if (result)
 747                         goto end;
 748         }
 749
 750         /*
 751          * If device has _EJ0, 'eject' file is created that is used to trigger
 752          * hot-removal function from userland.
 753          */
 754         if (acpi_has_method(dev->handle, "_EJ0")) {
 755                 result = device_create_file(&dev->dev, &dev_attr_eject);
 756                 if (result)
 757                         return result;
 758         }
 759
 760         if (dev->flags.power_manageable) {
 761                 result = device_create_file(&dev->dev, &dev_attr_power_state);
 762                 if (result)
 763                         return result;
 764
 765                 if (dev->power.flags.power_resources)
 766                         result = device_create_file(&dev->dev,
 767                                                     &dev_attr_real_power_state);
 768         }
 769
 770 end:
 771         return result;
 772 }
 773
 774 static void acpi_device_remove_files(struct acpi_device *dev)
 775 {
 776         if (dev->flags.power_manageable) {
 777                 device_remove_file(&dev->dev, &dev_attr_power_state);
 778                 if (dev->power.flags.power_resources)
 779                         device_remove_file(&dev->dev,
 780                                            &dev_attr_real_power_state);
 781         }
 782
 783         /*
 784          * If device has _STR, remove 'description' file
 785          */
 786         if (acpi_has_method(dev->handle, "_STR")) {
 787                 kfree(dev->pnp.str_obj);
 788                 device_remove_file(&dev->dev, &dev_attr_description);
 789         }
 790         /*
 791          * If device has _EJ0, remove 'eject' file.
 792          */
 793         if (acpi_has_method(dev->handle, "_EJ0"))
 794                 device_remove_file(&dev->dev, &dev_attr_eject);
 795
 796         if (acpi_has_method(dev->handle, "_SUN"))
 797                 device_remove_file(&dev->dev, &dev_attr_sun);
 798
 799         if (dev->pnp.unique_id)
 800                 device_remove_file(&dev->dev, &dev_attr_uid);
 801         if (dev->pnp.type.bus_address)
 802                 device_remove_file(&dev->dev, &dev_attr_adr);
 803         device_remove_file(&dev->dev, &dev_attr_modalias);
 804         device_remove_file(&dev->dev, &dev_attr_hid);
 805         if (acpi_has_method(dev->handle, "_STA"))
 806                 device_remove_file(&dev->dev, &dev_attr_status);
 807         if (dev->handle)
 808                 device_remove_file(&dev->dev, &dev_attr_path);
 809 }
 810 /* --------------------------------------------------------------------------
 811                         ACPI Bus operations
 812    -------------------------------------------------------------------------- */
 813
 814 static const struct acpi_device_id *__acpi_match_device(
 815         struct acpi_device *device, const struct acpi_device_id *ids)
 816 {
 817         const struct acpi_device_id *id;
 818         struct acpi_hardware_id *hwid;
 819
 820         /*
 821          * If the device is not present, it is unnecessary to load device
 822          * driver for it.
 823          */
 824         if (!device->status.present)
 825                 return NULL;
 826
 827         for (id = ids; id->id[0]; id++)
 828                 list_for_each_entry(hwid, &device->pnp.ids, list)
 829                         if (!strcmp((char *) id->id, hwid->id))
 830                                 return id;
 831
 832         return NULL;
 833 }
 834
 835 /**
 836  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 837  * @ids: Array of struct acpi_device_id object to match against.
 838  * @dev: The device structure to match.
 839  *
 840  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 841  * object for that handle and use that object to match against a given list of
 842  * device IDs.
 843  *
 844  * Return a pointer to the first matching ID on success or %NULL on failure.
 845  */
 846 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 847                                                const struct device *dev)
 848 {
 849         struct acpi_device *adev;
 850         acpi_handle handle = ACPI_HANDLE(dev);
 851
 852         if (!ids || !handle || acpi_bus_get_device(handle, &adev))
 853                 return NULL;
 854
 855         return __acpi_match_device(adev, ids);
 856 }
 857 EXPORT_SYMBOL_GPL(acpi_match_device);
 858
 859 int acpi_match_device_ids(struct acpi_device *device,
 860                           const struct acpi_device_id *ids)
 861 {
 862         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 863 }
 864 EXPORT_SYMBOL(acpi_match_device_ids);
 865
 866 static void acpi_free_power_resources_lists(struct acpi_device *device)
 867 {
 868         int i;
 869
 870         if (device->wakeup.flags.valid)
 871                 acpi_power_resources_list_free(&device->wakeup.resources);
 872
 873         if (!device->flags.power_manageable)
 874                 return;
 875
 876         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 877                 struct acpi_device_power_state *ps = &device->power.states[i];
 878                 acpi_power_resources_list_free(&ps->resources);
 879         }
 880 }
 881
 882 static void acpi_device_release(struct device *dev)
 883 {
 884         struct acpi_device *acpi_dev = to_acpi_device(dev);
 885
 886         acpi_free_pnp_ids(&acpi_dev->pnp);
 887         acpi_free_power_resources_lists(acpi_dev);
 888         kfree(acpi_dev);
 889 }
 890
 891 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 892 {
 893         struct acpi_device *acpi_dev = to_acpi_device(dev);
 894         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 895
 896         return acpi_dev->flags.match_driver
 897                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 898 }
 899
 900 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 901 {
 902         struct acpi_device *acpi_dev = to_acpi_device(dev);
 903         int len;
 904
 905         if (list_empty(&acpi_dev->pnp.ids))
 906                 return 0;
 907
 908         if (add_uevent_var(env, "MODALIAS="))
 909                 return -ENOMEM;
 910         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 911                               sizeof(env->buf) - env->buflen);
 912         if (len <= 0)
 913                 return len;
 914         env->buflen += len;
 915         return 0;
 916 }
 917
 918 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 919 {
 920         struct acpi_device *device = data;
 921
 922         device->driver->ops.notify(device, event);
 923 }
 924
 925 static acpi_status acpi_device_notify_fixed(void *data)
 926 {
 927         struct acpi_device *device = data;
 928
 929         /* Fixed hardware devices have no handles */
 930         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 931         return AE_OK;
 932 }
 933
 934 static int acpi_device_install_notify_handler(struct acpi_device *device)
 935 {
 936         acpi_status status;
 937
 938         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 939                 status =
 940                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 941                                                      acpi_device_notify_fixed,
 942                                                      device);
 943         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 944                 status =
 945                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 946                                                      acpi_device_notify_fixed,
 947                                                      device);
 948         else
 949                 status = acpi_install_notify_handler(device->handle,
 950                                                      ACPI_DEVICE_NOTIFY,
 951                                                      acpi_device_notify,
 952                                                      device);
 953
 954         if (ACPI_FAILURE(status))
 955                 return -EINVAL;
 956         return 0;
 957 }
 958
 959 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 960 {
 961         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 962                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 963                                                 acpi_device_notify_fixed);
 964         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 965                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 966                                                 acpi_device_notify_fixed);
 967         else
 968                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 969                                            acpi_device_notify);
 970 }
 971
 972 static int acpi_device_probe(struct device *dev)
 973 {
 974         struct acpi_device *acpi_dev = to_acpi_device(dev);
 975         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 976         int ret;
 977
 978         if (acpi_dev->handler)
 979                 return -EINVAL;
 980
 981         if (!acpi_drv->ops.add)
 982                 return -ENOSYS;
 983
 984         ret = acpi_drv->ops.add(acpi_dev);
 985         if (ret)
 986                 return ret;
 987
 988         acpi_dev->driver = acpi_drv;
 989         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 990                           "Driver [%s] successfully bound to device [%s]\n",
 991                           acpi_drv->name, acpi_dev->pnp.bus_id));
 992
 993         if (acpi_drv->ops.notify) {
 994                 ret = acpi_device_install_notify_handler(acpi_dev);
 995                 if (ret) {
 996                         if (acpi_drv->ops.remove)
 997                                 acpi_drv->ops.remove(acpi_dev);
 998
 999                         acpi_dev->driver = NULL;
1000                         acpi_dev->driver_data = NULL;
1001                         return ret;
1002                 }
1003         }
1004
1005         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1006                           acpi_drv->name, acpi_dev->pnp.bus_id));
1007         get_device(dev);
1008         return 0;
1009 }
1010
1011 static int acpi_device_remove(struct device * dev)
1012 {
1013         struct acpi_device *acpi_dev = to_acpi_device(dev);
1014         struct acpi_driver *acpi_drv = acpi_dev->driver;
1015
1016         if (acpi_drv) {
1017                 if (acpi_drv->ops.notify)
1018                         acpi_device_remove_notify_handler(acpi_dev);
1019                 if (acpi_drv->ops.remove)
1020                         acpi_drv->ops.remove(acpi_dev);
1021         }
1022         acpi_dev->driver = NULL;
1023         acpi_dev->driver_data = NULL;
1024
1025         put_device(dev);
1026         return 0;
1027 }
1028
1029 struct bus_type acpi_bus_type = {
1030         .name           = "acpi",
1031         .match          = acpi_bus_match,
1032         .probe          = acpi_device_probe,
1033         .remove         = acpi_device_remove,
1034         .uevent         = acpi_device_uevent,
1035 };
1036
1037 static void acpi_device_del(struct acpi_device *device)
1038 {
1039         mutex_lock(&acpi_device_lock);
1040         if (device->parent)
1041                 list_del(&device->node);
1042
1043         list_del(&device->wakeup_list);
1044         mutex_unlock(&acpi_device_lock);
1045
1046         acpi_power_add_remove_device(device, false);
1047         acpi_device_remove_files(device);
1048         if (device->remove)
1049                 device->remove(device);
1050
1051         device_del(&device->dev);
1052 }
1053
1054 static LIST_HEAD(acpi_device_del_list);
1055 static DEFINE_MUTEX(acpi_device_del_lock);
1056
1057 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1058 {
1059         for (;;) {
1060                 struct acpi_device *adev;
1061
1062                 mutex_lock(&acpi_device_del_lock);
1063
1064                 if (list_empty(&acpi_device_del_list)) {
1065                         mutex_unlock(&acpi_device_del_lock);
1066                         break;
1067                 }
1068                 adev = list_first_entry(&acpi_device_del_list,
1069                                         struct acpi_device, del_list);
1070                 list_del(&adev->del_list);
1071
1072                 mutex_unlock(&acpi_device_del_lock);
1073
1074                 acpi_device_del(adev);
1075                 /*
1076                  * Drop references to all power resources that might have been
1077                  * used by the device.
1078                  */
1079                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1080                 put_device(&adev->dev);
1081         }
1082 }
1083
1084 /**
1085  * acpi_scan_drop_device - Drop an ACPI device object.
1086  * @handle: Handle of an ACPI namespace node, not used.
1087  * @context: Address of the ACPI device object to drop.
1088  *
1089  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1090  * namespace node the device object pointed to by @context is attached to.
1091  *
1092  * The unregistration is carried out asynchronously to avoid running
1093  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1094  * ensure the correct ordering (the device objects must be unregistered in the
1095  * same order in which the corresponding namespace nodes are deleted).
1096  */
1097 static void acpi_scan_drop_device(acpi_handle handle, void *context)
1098 {
1099         static DECLARE_WORK(work, acpi_device_del_work_fn);
1100         struct acpi_device *adev = context;
1101
1102         mutex_lock(&acpi_device_del_lock);
1103
1104         /*
1105          * Use the ACPI hotplug workqueue which is ordered, so this work item
1106          * won't run after any hotplug work items submitted subsequently.  That
1107          * prevents attempts to register device objects identical to those being
1108          * deleted from happening concurrently (such attempts result from
1109          * hotplug events handled via the ACPI hotplug workqueue).  It also will
1110          * run after all of the work items submitted previosuly, which helps
1111          * those work items to ensure that they are not accessing stale device
1112          * objects.
1113          */
1114         if (list_empty(&acpi_device_del_list))
1115                 acpi_queue_hotplug_work(&work);
1116
1117         list_add_tail(&adev->del_list, &acpi_device_del_list);
1118         /* Make acpi_ns_validate_handle() return NULL for this handle. */
1119         adev->handle = INVALID_ACPI_HANDLE;
1120
1121         mutex_unlock(&acpi_device_del_lock);
1122 }
1123
1124 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
1125                                 void (*callback)(void *))
1126 {
1127         acpi_status status;
1128
1129         if (!device)
1130                 return -EINVAL;
1131
1132         status = acpi_get_data_full(handle, acpi_scan_drop_device,
1133                                     (void **)device, callback);
1134         if (ACPI_FAILURE(status) || !*device) {
1135                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1136                                   handle));
1137                 return -ENODEV;
1138         }
1139         return 0;
1140 }
1141
1142 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1143 {
1144         return acpi_get_device_data(handle, device, NULL);
1145 }
1146 EXPORT_SYMBOL(acpi_bus_get_device);
1147
1148 static void get_acpi_device(void *dev)
1149 {
1150         if (dev)
1151                 get_device(&((struct acpi_device *)dev)->dev);
1152 }
1153
1154 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
1155 {
1156         struct acpi_device *adev = NULL;
1157
1158         acpi_get_device_data(handle, &adev, get_acpi_device);
1159         return adev;
1160 }
1161
1162 void acpi_bus_put_acpi_device(struct acpi_device *adev)
1163 {
1164         put_device(&adev->dev);
1165 }
1166
1167 int acpi_device_add(struct acpi_device *device,
1168                     void (*release)(struct device *))
1169 {
1170         int result;
1171         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1172         int found = 0;
1173
1174         if (device->handle) {
1175                 acpi_status status;
1176
1177                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1178                                           device);
1179                 if (ACPI_FAILURE(status)) {
1180                         acpi_handle_err(device->handle,
1181                                         "Unable to attach device data\n");
1182                         return -ENODEV;
1183                 }
1184         }
1185
1186         /*
1187          * Linkage
1188          * -------
1189          * Link this device to its parent and siblings.
1190          */
1191         INIT_LIST_HEAD(&device->children);
1192         INIT_LIST_HEAD(&device->node);
1193         INIT_LIST_HEAD(&device->wakeup_list);
1194         INIT_LIST_HEAD(&device->physical_node_list);
1195         INIT_LIST_HEAD(&device->del_list);
1196         mutex_init(&device->physical_node_lock);
1197
1198         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1199         if (!new_bus_id) {
1200                 pr_err(PREFIX "Memory allocation error\n");
1201                 result = -ENOMEM;
1202                 goto err_detach;
1203         }
1204
1205         mutex_lock(&acpi_device_lock);
1206         /*
1207          * Find suitable bus_id and instance number in acpi_bus_id_list
1208          * If failed, create one and link it into acpi_bus_id_list
1209          */
1210         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1211                 if (!strcmp(acpi_device_bus_id->bus_id,
1212                             acpi_device_hid(device))) {
1213                         acpi_device_bus_id->instance_no++;
1214                         found = 1;
1215                         kfree(new_bus_id);
1216                         break;
1217                 }
1218         }
1219         if (!found) {
1220                 acpi_device_bus_id = new_bus_id;
1221                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1222                 acpi_device_bus_id->instance_no = 0;
1223                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1224         }
1225         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1226
1227         if (device->parent)
1228                 list_add_tail(&device->node, &device->parent->children);
1229
1230         if (device->wakeup.flags.valid)
1231                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1232         mutex_unlock(&acpi_device_lock);
1233
1234         if (device->parent)
1235                 device->dev.parent = &device->parent->dev;
1236         device->dev.bus = &acpi_bus_type;
1237         device->dev.release = release;
1238         result = device_add(&device->dev);
1239         if (result) {
1240                 dev_err(&device->dev, "Error registering device\n");
1241                 goto err;
1242         }
1243
1244         result = acpi_device_setup_files(device);
1245         if (result)
1246                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1247                        dev_name(&device->dev));
1248
1249         return 0;
1250
1251  err:
1252         mutex_lock(&acpi_device_lock);
1253         if (device->parent)
1254                 list_del(&device->node);
1255         list_del(&device->wakeup_list);
1256         mutex_unlock(&acpi_device_lock);
1257
1258  err_detach:
1259         acpi_detach_data(device->handle, acpi_scan_drop_device);
1260         return result;
1261 }
1262
1263 /* --------------------------------------------------------------------------
1264                                  Driver Management
1265    -------------------------------------------------------------------------- */
1266 /**
1267  * acpi_bus_register_driver - register a driver with the ACPI bus
1268  * @driver: driver being registered
1269  *
1270  * Registers a driver with the ACPI bus.  Searches the namespace for all
1271  * devices that match the driver's criteria and binds.  Returns zero for
1272  * success or a negative error status for failure.
1273  */
1274 int acpi_bus_register_driver(struct acpi_driver *driver)
1275 {
1276         int ret;
1277
1278         if (acpi_disabled)
1279                 return -ENODEV;
1280         driver->drv.name = driver->name;
1281         driver->drv.bus = &acpi_bus_type;
1282         driver->drv.owner = driver->owner;
1283
1284         ret = driver_register(&driver->drv);
1285         return ret;
1286 }
1287
1288 EXPORT_SYMBOL(acpi_bus_register_driver);
1289
1290 /**
1291  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1292  * @driver: driver to unregister
1293  *
1294  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
1295  * devices that match the driver's criteria and unbinds.
1296  */
1297 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1298 {
1299         driver_unregister(&driver->drv);
1300 }
1301
1302 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1303
1304 /* --------------------------------------------------------------------------
1305                                  Device Enumeration
1306    -------------------------------------------------------------------------- */
1307 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1308 {
1309         struct acpi_device *device = NULL;
1310         acpi_status status;
1311
1312         /*
1313          * Fixed hardware devices do not appear in the namespace and do not
1314          * have handles, but we fabricate acpi_devices for them, so we have
1315          * to deal with them specially.
1316          */
1317         if (!handle)
1318                 return acpi_root;
1319
1320         do {
1321                 status = acpi_get_parent(handle, &handle);
1322                 if (ACPI_FAILURE(status))
1323                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
1324         } while (acpi_bus_get_device(handle, &device));
1325         return device;
1326 }
1327
1328 acpi_status
1329 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1330 {
1331         acpi_status status;
1332         acpi_handle tmp;
1333         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1334         union acpi_object *obj;
1335
1336         status = acpi_get_handle(handle, "_EJD", &tmp);
1337         if (ACPI_FAILURE(status))
1338                 return status;
1339
1340         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1341         if (ACPI_SUCCESS(status)) {
1342                 obj = buffer.pointer;
1343                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1344                                          ejd);
1345                 kfree(buffer.pointer);
1346         }
1347         return status;
1348 }
1349 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1350
1351 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1352                                         struct acpi_device_wakeup *wakeup)
1353 {
1354         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1355         union acpi_object *package = NULL;
1356         union acpi_object *element = NULL;
1357         acpi_status status;
1358         int err = -ENODATA;
1359
1360         if (!wakeup)
1361                 return -EINVAL;
1362
1363         INIT_LIST_HEAD(&wakeup->resources);
1364
1365         /* _PRW */
1366         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1367         if (ACPI_FAILURE(status)) {
1368                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1369                 return err;
1370         }
1371
1372         package = (union acpi_object *)buffer.pointer;
1373
1374         if (!package || package->package.count < 2)
1375                 goto out;
1376
1377         element = &(package->package.elements[0]);
1378         if (!element)
1379                 goto out;
1380
1381         if (element->type == ACPI_TYPE_PACKAGE) {
1382                 if ((element->package.count < 2) ||
1383                     (element->package.elements[0].type !=
1384                      ACPI_TYPE_LOCAL_REFERENCE)
1385                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1386                         goto out;
1387
1388                 wakeup->gpe_device =
1389                     element->package.elements[0].reference.handle;
1390                 wakeup->gpe_number =
1391                     (u32) element->package.elements[1].integer.value;
1392         } else if (element->type == ACPI_TYPE_INTEGER) {
1393                 wakeup->gpe_device = NULL;
1394                 wakeup->gpe_number = element->integer.value;
1395         } else {
1396                 goto out;
1397         }
1398
1399         element = &(package->package.elements[1]);
1400         if (element->type != ACPI_TYPE_INTEGER)
1401                 goto out;
1402
1403         wakeup->sleep_state = element->integer.value;
1404
1405         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1406         if (err)
1407                 goto out;
1408
1409         if (!list_empty(&wakeup->resources)) {
1410                 int sleep_state;
1411
1412                 err = acpi_power_wakeup_list_init(&wakeup->resources,
1413                                                   &sleep_state);
1414                 if (err) {
1415                         acpi_handle_warn(handle, "Retrieving current states "
1416                                          "of wakeup power resources failed\n");
1417                         acpi_power_resources_list_free(&wakeup->resources);
1418                         goto out;
1419                 }
1420                 if (sleep_state < wakeup->sleep_state) {
1421                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
1422                                          "(S%d) by S%d from power resources\n",
1423                                          (int)wakeup->sleep_state, sleep_state);
1424                         wakeup->sleep_state = sleep_state;
1425                 }
1426         }
1427
1428  out:
1429         kfree(buffer.pointer);
1430         return err;
1431 }
1432
1433 static void acpi_wakeup_gpe_init(struct acpi_device *device)
1434 {
1435         struct acpi_device_id button_device_ids[] = {
1436                 {"PNP0C0C", 0},
1437                 {"PNP0C0D", 0},
1438                 {"PNP0C0E", 0},
1439                 {"", 0},
1440         };
1441         struct acpi_device_wakeup *wakeup = &device->wakeup;
1442         acpi_status status;
1443         acpi_event_status event_status;
1444
1445         wakeup->flags.notifier_present = 0;
1446
1447         /* Power button, Lid switch always enable wakeup */
1448         if (!acpi_match_device_ids(device, button_device_ids)) {
1449                 wakeup->flags.run_wake = 1;
1450                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1451                         /* Do not use Lid/sleep button for S5 wakeup */
1452                         if (wakeup->sleep_state == ACPI_STATE_S5)
1453                                 wakeup->sleep_state = ACPI_STATE_S4;
1454                 }
1455                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
1456                 device_set_wakeup_capable(&device->dev, true);
1457                 return;
1458         }
1459
1460         acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
1461                                 wakeup->gpe_number);
1462         status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
1463                                      &event_status);
1464         if (ACPI_FAILURE(status))
1465                 return;
1466
1467         wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1468 }
1469
1470 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1471 {
1472         int err;
1473
1474         /* Presence of _PRW indicates wake capable */
1475         if (!acpi_has_method(device->handle, "_PRW"))
1476                 return;
1477
1478         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1479                                                            &device->wakeup);
1480         if (err) {
1481                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1482                 return;
1483         }
1484
1485         device->wakeup.flags.valid = 1;
1486         device->wakeup.prepare_count = 0;
1487         acpi_wakeup_gpe_init(device);
1488         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1489          * system for the ACPI device with the _PRW object.
1490          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1491          * So it is necessary to call _DSW object first. Only when it is not
1492          * present will the _PSW object used.
1493          */
1494         err = acpi_device_sleep_wake(device, 0, 0, 0);
1495         if (err)
1496                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1497                                 "error in _DSW or _PSW evaluation\n"));
1498 }
1499
1500 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1501 {
1502         struct acpi_device_power_state *ps = &device->power.states[state];
1503         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1504         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1505         acpi_status status;
1506
1507         INIT_LIST_HEAD(&ps->resources);
1508
1509         /* Evaluate "_PRx" to get referenced power resources */
1510         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1511         if (ACPI_SUCCESS(status)) {
1512                 union acpi_object *package = buffer.pointer;
1513
1514                 if (buffer.length && package
1515                     && package->type == ACPI_TYPE_PACKAGE
1516                     && package->package.count) {
1517                         int err = acpi_extract_power_resources(package, 0,
1518                                                                &ps->resources);
1519                         if (!err)
1520                                 device->power.flags.power_resources = 1;
1521                 }
1522                 ACPI_FREE(buffer.pointer);
1523         }
1524
1525         /* Evaluate "_PSx" to see if we can do explicit sets */
1526         pathname[2] = 'S';
1527         if (acpi_has_method(device->handle, pathname))
1528                 ps->flags.explicit_set = 1;
1529
1530         /*
1531          * State is valid if there are means to put the device into it.
1532          * D3hot is only valid if _PR3 present.
1533          */
1534         if (!list_empty(&ps->resources)
1535             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1536                 ps->flags.valid = 1;
1537                 ps->flags.os_accessible = 1;
1538         }
1539
1540         ps->power = -1;         /* Unknown - driver assigned */
1541         ps->latency = -1;       /* Unknown - driver assigned */
1542 }
1543
1544 static void acpi_bus_get_power_flags(struct acpi_device *device)
1545 {
1546         u32 i;
1547
1548         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1549         if (!acpi_has_method(device->handle, "_PS0") &&
1550             !acpi_has_method(device->handle, "_PR0"))
1551                 return;
1552
1553         device->flags.power_manageable = 1;
1554
1555         /*
1556          * Power Management Flags
1557          */
1558         if (acpi_has_method(device->handle, "_PSC"))
1559                 device->power.flags.explicit_get = 1;
1560
1561         if (acpi_has_method(device->handle, "_IRC"))
1562                 device->power.flags.inrush_current = 1;
1563
1564         if (acpi_has_method(device->handle, "_DSW"))
1565                 device->power.flags.dsw_present = 1;
1566
1567         /*
1568          * Enumerate supported power management states
1569          */
1570         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1571                 acpi_bus_init_power_state(device, i);
1572
1573         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1574
1575         /* Set defaults for D0 and D3 states (always valid) */
1576         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1577         device->power.states[ACPI_STATE_D0].power = 100;
1578         device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1579         device->power.states[ACPI_STATE_D3_COLD].power = 0;
1580
1581         /* Set D3cold's explicit_set flag if _PS3 exists. */
1582         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1583                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1584
1585         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1586         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1587                         device->power.flags.power_resources)
1588                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1589
1590         if (acpi_bus_init_power(device)) {
1591                 acpi_free_power_resources_lists(device);
1592                 device->flags.power_manageable = 0;
1593         }
1594 }
1595
1596 static void acpi_bus_get_flags(struct acpi_device *device)
1597 {
1598         /* Presence of _STA indicates 'dynamic_status' */
1599         if (acpi_has_method(device->handle, "_STA"))
1600                 device->flags.dynamic_status = 1;
1601
1602         /* Presence of _RMV indicates 'removable' */
1603         if (acpi_has_method(device->handle, "_RMV"))
1604                 device->flags.removable = 1;
1605
1606         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1607         if (acpi_has_method(device->handle, "_EJD") ||
1608             acpi_has_method(device->handle, "_EJ0"))
1609                 device->flags.ejectable = 1;
1610 }
1611
1612 static void acpi_device_get_busid(struct acpi_device *device)
1613 {
1614         char bus_id[5] = { '?', 0 };
1615         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1616         int i = 0;
1617
1618         /*
1619          * Bus ID
1620          * ------
1621          * The device's Bus ID is simply the object name.
1622          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1623          */
1624         if (ACPI_IS_ROOT_DEVICE(device)) {
1625                 strcpy(device->pnp.bus_id, "ACPI");
1626                 return;
1627         }
1628
1629         switch (device->device_type) {
1630         case ACPI_BUS_TYPE_POWER_BUTTON:
1631                 strcpy(device->pnp.bus_id, "PWRF");
1632                 break;
1633         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1634                 strcpy(device->pnp.bus_id, "SLPF");
1635                 break;
1636         default:
1637                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1638                 /* Clean up trailing underscores (if any) */
1639                 for (i = 3; i > 1; i--) {
1640                         if (bus_id[i] == '_')
1641                                 bus_id[i] = '\0';
1642                         else
1643                                 break;
1644                 }
1645                 strcpy(device->pnp.bus_id, bus_id);
1646                 break;
1647         }
1648 }
1649
1650 /*
1651  * acpi_ata_match - see if an acpi object is an ATA device
1652  *
1653  * If an acpi object has one of the ACPI ATA methods defined,
1654  * then we can safely call it an ATA device.
1655  */
1656 bool acpi_ata_match(acpi_handle handle)
1657 {
1658         return acpi_has_method(handle, "_GTF") ||
1659                acpi_has_method(handle, "_GTM") ||
1660                acpi_has_method(handle, "_STM") ||
1661                acpi_has_method(handle, "_SDD");
1662 }
1663
1664 /*
1665  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1666  *
1667  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1668  * then we can safely call it an ejectable drive bay
1669  */
1670 bool acpi_bay_match(acpi_handle handle)
1671 {
1672         acpi_handle phandle;
1673
1674         if (!acpi_has_method(handle, "_EJ0"))
1675                 return false;
1676         if (acpi_ata_match(handle))
1677                 return true;
1678         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1679                 return false;
1680
1681         return acpi_ata_match(phandle);
1682 }
1683
1684 bool acpi_device_is_battery(struct acpi_device *adev)
1685 {
1686         struct acpi_hardware_id *hwid;
1687
1688         list_for_each_entry(hwid, &adev->pnp.ids, list)
1689                 if (!strcmp("PNP0C0A", hwid->id))
1690                         return true;
1691
1692         return false;
1693 }
1694
1695 static bool is_ejectable_bay(struct acpi_device *adev)
1696 {
1697         acpi_handle handle = adev->handle;
1698
1699         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1700                 return true;
1701
1702         return acpi_bay_match(handle);
1703 }
1704
1705 /*
1706  * acpi_dock_match - see if an acpi object has a _DCK method
1707  */
1708 bool acpi_dock_match(acpi_handle handle)
1709 {
1710         return acpi_has_method(handle, "_DCK");
1711 }
1712
1713 const char *acpi_device_hid(struct acpi_device *device)
1714 {
1715         struct acpi_hardware_id *hid;
1716
1717         if (list_empty(&device->pnp.ids))
1718                 return dummy_hid;
1719
1720         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1721         return hid->id;
1722 }
1723 EXPORT_SYMBOL(acpi_device_hid);
1724
1725 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1726 {
1727         struct acpi_hardware_id *id;
1728
1729         id = kmalloc(sizeof(*id), GFP_KERNEL);
1730         if (!id)
1731                 return;
1732
1733         id->id = kstrdup(dev_id, GFP_KERNEL);
1734         if (!id->id) {
1735                 kfree(id);
1736                 return;
1737         }
1738
1739         list_add_tail(&id->list, &pnp->ids);
1740         pnp->type.hardware_id = 1;
1741 }
1742
1743 /*
1744  * Old IBM workstations have a DSDT bug wherein the SMBus object
1745  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1746  * prefix.  Work around this.
1747  */
1748 static bool acpi_ibm_smbus_match(acpi_handle handle)
1749 {
1750         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1751         struct acpi_buffer path = { sizeof(node_name), node_name };
1752
1753         if (!dmi_name_in_vendors("IBM"))
1754                 return false;
1755
1756         /* Look for SMBS object */
1757         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1758             strcmp("SMBS", path.pointer))
1759                 return false;
1760
1761         /* Does it have the necessary (but misnamed) methods? */
1762         if (acpi_has_method(handle, "SBI") &&
1763             acpi_has_method(handle, "SBR") &&
1764             acpi_has_method(handle, "SBW"))
1765                 return true;
1766
1767         return false;
1768 }
1769
1770 static bool acpi_object_is_system_bus(acpi_handle handle)
1771 {
1772         acpi_handle tmp;
1773
1774         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1775             tmp == handle)
1776                 return true;
1777         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1778             tmp == handle)
1779                 return true;
1780
1781         return false;
1782 }
1783
1784 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1785                                 int device_type)
1786 {
1787         acpi_status status;
1788         struct acpi_device_info *info;
1789         struct acpi_pnp_device_id_list *cid_list;
1790         int i;
1791
1792         switch (device_type) {
1793         case ACPI_BUS_TYPE_DEVICE:
1794                 if (handle == ACPI_ROOT_OBJECT) {
1795                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1796                         break;
1797                 }
1798
1799                 status = acpi_get_object_info(handle, &info);
1800                 if (ACPI_FAILURE(status)) {
1801                         pr_err(PREFIX "%s: Error reading device info\n",
1802                                         __func__);
1803                         return;
1804                 }
1805
1806                 if (info->valid & ACPI_VALID_HID) {
1807                         acpi_add_id(pnp, info->hardware_id.string);
1808                         pnp->type.platform_id = 1;
1809                 }
1810                 if (info->valid & ACPI_VALID_CID) {
1811                         cid_list = &info->compatible_id_list;
1812                         for (i = 0; i < cid_list->count; i++)
1813                                 acpi_add_id(pnp, cid_list->ids[i].string);
1814                 }
1815                 if (info->valid & ACPI_VALID_ADR) {
1816                         pnp->bus_address = info->address;
1817                         pnp->type.bus_address = 1;
1818                 }
1819                 if (info->valid & ACPI_VALID_UID)
1820                         pnp->unique_id = kstrdup(info->unique_id.string,
1821                                                         GFP_KERNEL);
1822
1823                 kfree(info);
1824
1825                 /*
1826                  * Some devices don't reliably have _HIDs & _CIDs, so add
1827                  * synthetic HIDs to make sure drivers can find them.
1828                  */
1829                 if (acpi_is_video_device(handle))
1830                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1831                 else if (acpi_bay_match(handle))
1832                         acpi_add_id(pnp, ACPI_BAY_HID);
1833                 else if (acpi_dock_match(handle))
1834                         acpi_add_id(pnp, ACPI_DOCK_HID);
1835                 else if (acpi_ibm_smbus_match(handle))
1836                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1837                 else if (list_empty(&pnp->ids) &&
1838                          acpi_object_is_system_bus(handle)) {
1839                         /* \_SB, \_TZ, LNXSYBUS */
1840                         acpi_add_id(pnp, ACPI_BUS_HID);
1841                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1842                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1843                 }
1844
1845                 break;
1846         case ACPI_BUS_TYPE_POWER:
1847                 acpi_add_id(pnp, ACPI_POWER_HID);
1848                 break;
1849         case ACPI_BUS_TYPE_PROCESSOR:
1850                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1851                 break;
1852         case ACPI_BUS_TYPE_THERMAL:
1853                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1854                 break;
1855         case ACPI_BUS_TYPE_POWER_BUTTON:
1856                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1857                 break;
1858         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1859                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1860                 break;
1861         }
1862 }
1863
1864 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1865 {
1866         struct acpi_hardware_id *id, *tmp;
1867
1868         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1869                 kfree(id->id);
1870                 kfree(id);
1871         }
1872         kfree(pnp->unique_id);
1873 }
1874
1875 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1876                              int type, unsigned long long sta)
1877 {
1878         INIT_LIST_HEAD(&device->pnp.ids);
1879         device->device_type = type;
1880         device->handle = handle;
1881         device->parent = acpi_bus_get_parent(handle);
1882         acpi_set_device_status(device, sta);
1883         acpi_device_get_busid(device);
1884         acpi_set_pnp_ids(handle, &device->pnp, type);
1885         acpi_bus_get_flags(device);
1886         device->flags.match_driver = false;
1887         device->flags.initialized = true;
1888         device->flags.visited = false;
1889         device_initialize(&device->dev);
1890         dev_set_uevent_suppress(&device->dev, true);
1891 }
1892
1893 void acpi_device_add_finalize(struct acpi_device *device)
1894 {
1895         dev_set_uevent_suppress(&device->dev, false);
1896         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1897 }
1898
1899 static int acpi_add_single_object(struct acpi_device **child,
1900                                   acpi_handle handle, int type,
1901                                   unsigned long long sta)
1902 {
1903         int result;
1904         struct acpi_device *device;
1905         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1906
1907         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1908         if (!device) {
1909                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1910                 return -ENOMEM;
1911         }
1912
1913         acpi_init_device_object(device, handle, type, sta);
1914         acpi_bus_get_power_flags(device);
1915         acpi_bus_get_wakeup_device_flags(device);
1916
1917         result = acpi_device_add(device, acpi_device_release);
1918         if (result) {
1919                 acpi_device_release(&device->dev);
1920                 return result;
1921         }
1922
1923         acpi_power_add_remove_device(device, true);
1924         acpi_device_add_finalize(device);
1925         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1926         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1927                 dev_name(&device->dev), (char *) buffer.pointer,
1928                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1929         kfree(buffer.pointer);
1930         *child = device;
1931         return 0;
1932 }
1933
1934 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1935                                     unsigned long long *sta)
1936 {
1937         acpi_status status;
1938         acpi_object_type acpi_type;
1939
1940         status = acpi_get_type(handle, &acpi_type);
1941         if (ACPI_FAILURE(status))
1942                 return -ENODEV;
1943
1944         switch (acpi_type) {
1945         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1946         case ACPI_TYPE_DEVICE:
1947                 *type = ACPI_BUS_TYPE_DEVICE;
1948                 status = acpi_bus_get_status_handle(handle, sta);
1949                 if (ACPI_FAILURE(status))
1950                         return -ENODEV;
1951                 break;
1952         case ACPI_TYPE_PROCESSOR:
1953                 *type = ACPI_BUS_TYPE_PROCESSOR;
1954                 status = acpi_bus_get_status_handle(handle, sta);
1955                 if (ACPI_FAILURE(status))
1956                         return -ENODEV;
1957                 break;
1958         case ACPI_TYPE_THERMAL:
1959                 *type = ACPI_BUS_TYPE_THERMAL;
1960                 *sta = ACPI_STA_DEFAULT;
1961                 break;
1962         case ACPI_TYPE_POWER:
1963                 *type = ACPI_BUS_TYPE_POWER;
1964                 *sta = ACPI_STA_DEFAULT;
1965                 break;
1966         default:
1967                 return -ENODEV;
1968         }
1969
1970         return 0;
1971 }
1972
1973 bool acpi_device_is_present(struct acpi_device *adev)
1974 {
1975         if (adev->status.present || adev->status.functional)
1976                 return true;
1977
1978         adev->flags.initialized = false;
1979         return false;
1980 }
1981
1982 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1983                                        char *idstr,
1984                                        const struct acpi_device_id **matchid)
1985 {
1986         const struct acpi_device_id *devid;
1987
1988         if (handler->match)
1989                 return handler->match(idstr, matchid);
1990
1991         for (devid = handler->ids; devid->id[0]; devid++)
1992                 if (!strcmp((char *)devid->id, idstr)) {
1993                         if (matchid)
1994                                 *matchid = devid;
1995
1996                         return true;
1997                 }
1998
1999         return false;
2000 }
2001
2002 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
2003                                         const struct acpi_device_id **matchid)
2004 {
2005         struct acpi_scan_handler *handler;
2006
2007         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
2008                 if (acpi_scan_handler_matching(handler, idstr, matchid))
2009                         return handler;
2010
2011         return NULL;
2012 }
2013
2014 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2015 {
2016         if (!!hotplug->enabled == !!val)
2017                 return;
2018
2019         mutex_lock(&acpi_scan_lock);
2020
2021         hotplug->enabled = val;
2022
2023         mutex_unlock(&acpi_scan_lock);
2024 }
2025
2026 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2027 {
2028         struct acpi_hardware_id *hwid;
2029
2030         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2031                 acpi_dock_add(adev);
2032                 return;
2033         }
2034         list_for_each_entry(hwid, &adev->pnp.ids, list) {
2035                 struct acpi_scan_handler *handler;
2036
2037                 handler = acpi_scan_match_handler(hwid->id, NULL);
2038                 if (handler) {
2039                         adev->flags.hotplug_notify = true;
2040                         break;
2041                 }
2042         }
2043 }
2044
2045 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2046                                       void *not_used, void **return_value)
2047 {
2048         struct acpi_device *device = NULL;
2049         int type;
2050         unsigned long long sta;
2051         int result;
2052
2053         acpi_bus_get_device(handle, &device);
2054         if (device)
2055                 goto out;
2056
2057         result = acpi_bus_type_and_status(handle, &type, &sta);
2058         if (result)
2059                 return AE_OK;
2060
2061         if (type == ACPI_BUS_TYPE_POWER) {
2062                 acpi_add_power_resource(handle);
2063                 return AE_OK;
2064         }
2065
2066         acpi_add_single_object(&device, handle, type, sta);
2067         if (!device)
2068                 return AE_CTRL_DEPTH;
2069
2070         acpi_scan_init_hotplug(device);
2071
2072  out:
2073         if (!*return_value)
2074                 *return_value = device;
2075
2076         return AE_OK;
2077 }
2078
2079 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
2080 {
2081         bool *is_spi_i2c_slave_p = data;
2082
2083         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
2084                 return 1;
2085
2086         /*
2087          * devices that are connected to UART still need to be enumerated to
2088          * platform bus
2089          */
2090         if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
2091                 *is_spi_i2c_slave_p = true;
2092
2093          /* no need to do more checking */
2094         return -1;
2095 }
2096
2097 static void acpi_default_enumeration(struct acpi_device *device)
2098 {
2099         struct list_head resource_list;
2100         bool is_spi_i2c_slave = false;
2101
2102         if (!device->pnp.type.platform_id || device->handler)
2103                 return;
2104
2105         /*
2106          * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2107          * respective parents.
2108          */
2109         INIT_LIST_HEAD(&resource_list);
2110         acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
2111                                &is_spi_i2c_slave);
2112         acpi_dev_free_resource_list(&resource_list);
2113         if (!is_spi_i2c_slave)
2114                 acpi_create_platform_device(device);
2115 }
2116
2117 static int acpi_scan_attach_handler(struct acpi_device *device)
2118 {
2119         struct acpi_hardware_id *hwid;
2120         int ret = 0;
2121
2122         list_for_each_entry(hwid, &device->pnp.ids, list) {
2123                 const struct acpi_device_id *devid;
2124                 struct acpi_scan_handler *handler;
2125
2126                 handler = acpi_scan_match_handler(hwid->id, &devid);
2127                 if (handler) {
2128                         if (!handler->attach) {
2129                                 device->pnp.type.platform_id = 0;
2130                                 continue;
2131                         }
2132                         device->handler = handler;
2133                         ret = handler->attach(device, devid);
2134                         if (ret > 0)
2135                                 break;
2136
2137                         device->handler = NULL;
2138                         if (ret < 0)
2139                                 break;
2140                 }
2141         }
2142         if (!ret)
2143                 acpi_default_enumeration(device);
2144
2145         return ret;
2146 }
2147
2148 static void acpi_bus_attach(struct acpi_device *device)
2149 {
2150         struct acpi_device *child;
2151         acpi_handle ejd;
2152         int ret;
2153
2154         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2155                 register_dock_dependent_device(device, ejd);
2156
2157         acpi_bus_get_status(device);
2158         /* Skip devices that are not present. */
2159         if (!acpi_device_is_present(device)) {
2160                 device->flags.visited = false;
2161                 return;
2162         }
2163         if (device->handler)
2164                 goto ok;
2165
2166         if (!device->flags.initialized) {
2167                 acpi_bus_update_power(device, NULL);
2168                 device->flags.initialized = true;
2169         }
2170         device->flags.visited = false;
2171         ret = acpi_scan_attach_handler(device);
2172         if (ret < 0)
2173                 return;
2174
2175         device->flags.match_driver = true;
2176         if (!ret) {
2177                 ret = device_attach(&device->dev);
2178                 if (ret < 0)
2179                         return;
2180         }
2181         device->flags.visited = true;
2182
2183  ok:
2184         list_for_each_entry(child, &device->children, node)
2185                 acpi_bus_attach(child);
2186 }
2187
2188 /**
2189  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2190  * @handle: Root of the namespace scope to scan.
2191  *
2192  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2193  * found devices.
2194  *
2195  * If no devices were found, -ENODEV is returned, but it does not mean that
2196  * there has been a real error.  There just have been no suitable ACPI objects
2197  * in the table trunk from which the kernel could create a device and add an
2198  * appropriate driver.
2199  *
2200  * Must be called under acpi_scan_lock.
2201  */
2202 int acpi_bus_scan(acpi_handle handle)
2203 {
2204         void *device = NULL;
2205
2206         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2207                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2208                                     acpi_bus_check_add, NULL, NULL, &device);
2209
2210         if (device) {
2211                 acpi_bus_attach(device);
2212                 return 0;
2213         }
2214         return -ENODEV;
2215 }
2216 EXPORT_SYMBOL(acpi_bus_scan);
2217
2218 /**
2219  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2220  * @adev: Root of the ACPI namespace scope to walk.
2221  *
2222  * Must be called under acpi_scan_lock.
2223  */
2224 void acpi_bus_trim(struct acpi_device *adev)
2225 {
2226         struct acpi_scan_handler *handler = adev->handler;
2227         struct acpi_device *child;
2228
2229         list_for_each_entry_reverse(child, &adev->children, node)
2230                 acpi_bus_trim(child);
2231
2232         adev->flags.match_driver = false;
2233         if (handler) {
2234                 if (handler->detach)
2235                         handler->detach(adev);
2236
2237                 adev->handler = NULL;
2238         } else {
2239                 device_release_driver(&adev->dev);
2240         }
2241         /*
2242          * Most likely, the device is going away, so put it into D3cold before
2243          * that.
2244          */
2245         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2246         adev->flags.initialized = false;
2247         adev->flags.visited = false;
2248 }
2249 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2250
2251 static int acpi_bus_scan_fixed(void)
2252 {
2253         int result = 0;
2254
2255         /*
2256          * Enumerate all fixed-feature devices.
2257          */
2258         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2259                 struct acpi_device *device = NULL;
2260
2261                 result = acpi_add_single_object(&device, NULL,
2262                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2263                                                 ACPI_STA_DEFAULT);
2264                 if (result)
2265                         return result;
2266
2267                 device->flags.match_driver = true;
2268                 result = device_attach(&device->dev);
2269                 if (result < 0)
2270                         return result;
2271
2272                 device_init_wakeup(&device->dev, true);
2273         }
2274
2275         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2276                 struct acpi_device *device = NULL;
2277
2278                 result = acpi_add_single_object(&device, NULL,
2279                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2280                                                 ACPI_STA_DEFAULT);
2281                 if (result)
2282                         return result;
2283
2284                 device->flags.match_driver = true;
2285                 result = device_attach(&device->dev);
2286         }
2287
2288         return result < 0 ? result : 0;
2289 }
2290
2291 int __init acpi_scan_init(void)
2292 {
2293         int result;
2294
2295         result = bus_register(&acpi_bus_type);
2296         if (result) {
2297                 /* We don't want to quit even if we failed to add suspend/resume */
2298                 printk(KERN_ERR PREFIX "Could not register bus type\n");
2299         }
2300
2301         acpi_pci_root_init();
2302         acpi_pci_link_init();
2303         acpi_processor_init();
2304         acpi_lpss_init();
2305         acpi_cmos_rtc_init();
2306         acpi_container_init();
2307         acpi_memory_hotplug_init();
2308         acpi_pnp_init();
2309
2310         mutex_lock(&acpi_scan_lock);
2311         /*
2312          * Enumerate devices in the ACPI namespace.
2313          */
2314         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2315         if (result)
2316                 goto out;
2317
2318         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2319         if (result)
2320                 goto out;
2321
2322         /* Fixed feature devices do not exist on HW-reduced platform */
2323         if (!acpi_gbl_reduced_hardware) {
2324                 result = acpi_bus_scan_fixed();
2325                 if (result) {
2326                         acpi_detach_data(acpi_root->handle,
2327                                          acpi_scan_drop_device);
2328                         acpi_device_del(acpi_root);
2329                         put_device(&acpi_root->dev);
2330                         goto out;
2331                 }
2332         }
2333
2334         acpi_update_all_gpes();
2335
2336  out:
2337         mutex_unlock(&acpi_scan_lock);
2338         return result;
2339 }