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_dep_list);
  40 static DEFINE_MUTEX(acpi_dep_list_lock);
  41 static LIST_HEAD(acpi_bus_id_list);
  42 static DEFINE_MUTEX(acpi_scan_lock);
  43 static LIST_HEAD(acpi_scan_handlers_list);
  44 DEFINE_MUTEX(acpi_device_lock);
  45 LIST_HEAD(acpi_wakeup_device_list);
  46 static DEFINE_MUTEX(acpi_hp_context_lock);
  47
  48 struct acpi_dep_data {
  49         struct list_head node;
  50         acpi_handle master;
  51         acpi_handle slave;
  52 };
  53
  54 struct acpi_device_bus_id{
  55         char bus_id[15];
  56         unsigned int instance_no;
  57         struct list_head node;
  58 };
  59
  60 void acpi_scan_lock_acquire(void)
  61 {
  62         mutex_lock(&acpi_scan_lock);
  63 }
  64 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  65
  66 void acpi_scan_lock_release(void)
  67 {
  68         mutex_unlock(&acpi_scan_lock);
  69 }
  70 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  71
  72 void acpi_lock_hp_context(void)
  73 {
  74         mutex_lock(&acpi_hp_context_lock);
  75 }
  76
  77 void acpi_unlock_hp_context(void)
  78 {
  79         mutex_unlock(&acpi_hp_context_lock);
  80 }
  81
  82 void acpi_initialize_hp_context(struct acpi_device *adev,
  83                                 struct acpi_hotplug_context *hp,
  84                                 int (*notify)(struct acpi_device *, u32),
  85                                 void (*uevent)(struct acpi_device *, u32))
  86 {
  87         acpi_lock_hp_context();
  88         hp->notify = notify;
  89         hp->uevent = uevent;
  90         acpi_set_hp_context(adev, hp);
  91         acpi_unlock_hp_context();
  92 }
  93 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
  94
  95 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  96 {
  97         if (!handler)
  98                 return -EINVAL;
  99
 100         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
 101         return 0;
 102 }
 103
 104 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
 105                                        const char *hotplug_profile_name)
 106 {
 107         int error;
 108
 109         error = acpi_scan_add_handler(handler);
 110         if (error)
 111                 return error;
 112
 113         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
 114         return 0;
 115 }
 116
 117 /*
 118  * Creates hid/cid(s) string needed for modalias and uevent
 119  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
 120  * char *modalias: "acpi:IBM0001:ACPI0001"
 121  * Return: 0: no _HID and no _CID
 122  *         -EINVAL: output error
 123  *         -ENOMEM: output is truncated
 124 */
 125 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
 126                            int size)
 127 {
 128         int len;
 129         int count;
 130         struct acpi_hardware_id *id;
 131
 132         if (list_empty(&acpi_dev->pnp.ids))
 133                 return 0;
 134
 135         /*
 136          * If the device has PRP0001 we expose DT compatible modalias
 137          * instead in form of of:NnameTCcompatible.
 138          */
 139         if (acpi_dev->data.of_compatible) {
 140                 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
 141                 const union acpi_object *of_compatible, *obj;
 142                 int i, nval;
 143                 char *c;
 144
 145                 acpi_get_name(acpi_dev->handle, ACPI_SINGLE_NAME, &buf);
 146                 /* DT strings are all in lower case */
 147                 for (c = buf.pointer; *c != '\0'; c++)
 148                         *c = tolower(*c);
 149
 150                 len = snprintf(modalias, size, "of:N%sT", (char *)buf.pointer);
 151                 ACPI_FREE(buf.pointer);
 152
 153                 of_compatible = acpi_dev->data.of_compatible;
 154                 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 155                         nval = of_compatible->package.count;
 156                         obj = of_compatible->package.elements;
 157                 } else { /* Must be ACPI_TYPE_STRING. */
 158                         nval = 1;
 159                         obj = of_compatible;
 160                 }
 161                 for (i = 0; i < nval; i++, obj++) {
 162                         count = snprintf(&modalias[len], size, "C%s",
 163                                          obj->string.pointer);
 164                         if (count < 0)
 165                                 return -EINVAL;
 166                         if (count >= size)
 167                                 return -ENOMEM;
 168
 169                         len += count;
 170                         size -= count;
 171                 }
 172         } else {
 173                 len = snprintf(modalias, size, "acpi:");
 174                 size -= len;
 175
 176                 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
 177                         count = snprintf(&modalias[len], size, "%s:", id->id);
 178                         if (count < 0)
 179                                 return -EINVAL;
 180                         if (count >= size)
 181                                 return -ENOMEM;
 182                         len += count;
 183                         size -= count;
 184                 }
 185         }
 186
 187         modalias[len] = '\0';
 188         return len;
 189 }
 190
 191 /*
 192  * acpi_companion_match() - Can we match via ACPI companion device
 193  * @dev: Device in question
 194  *
 195  * Check if the given device has an ACPI companion and if that companion has
 196  * a valid list of PNP IDs, and if the device is the first (primary) physical
 197  * device associated with it.
 198  *
 199  * If multiple physical devices are attached to a single ACPI companion, we need
 200  * to be careful.  The usage scenario for this kind of relationship is that all
 201  * of the physical devices in question use resources provided by the ACPI
 202  * companion.  A typical case is an MFD device where all the sub-devices share
 203  * the parent's ACPI companion.  In such cases we can only allow the primary
 204  * (first) physical device to be matched with the help of the companion's PNP
 205  * IDs.
 206  *
 207  * Additional physical devices sharing the ACPI companion can still use
 208  * resources available from it but they will be matched normally using functions
 209  * provided by their bus types (and analogously for their modalias).
 210  */
 211 static bool acpi_companion_match(const struct device *dev)
 212 {
 213         struct acpi_device *adev;
 214         bool ret;
 215
 216         adev = ACPI_COMPANION(dev);
 217         if (!adev)
 218                 return false;
 219
 220         if (list_empty(&adev->pnp.ids))
 221                 return false;
 222
 223         mutex_lock(&adev->physical_node_lock);
 224         if (list_empty(&adev->physical_node_list)) {
 225                 ret = false;
 226         } else {
 227                 const struct acpi_device_physical_node *node;
 228
 229                 node = list_first_entry(&adev->physical_node_list,
 230                                         struct acpi_device_physical_node, node);
 231                 ret = node->dev == dev;
 232         }
 233         mutex_unlock(&adev->physical_node_lock);
 234
 235         return ret;
 236 }
 237
 238 /*
 239  * Creates uevent modalias field for ACPI enumerated devices.
 240  * Because the other buses does not support ACPI HIDs & CIDs.
 241  * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
 242  * "acpi:IBM0001:ACPI0001"
 243  */
 244 int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
 245 {
 246         int len;
 247
 248         if (!acpi_companion_match(dev))
 249                 return -ENODEV;
 250
 251         if (add_uevent_var(env, "MODALIAS="))
 252                 return -ENOMEM;
 253         len = create_modalias(ACPI_COMPANION(dev), &env->buf[env->buflen - 1],
 254                                 sizeof(env->buf) - env->buflen);
 255         if (len <= 0)
 256                 return len;
 257         env->buflen += len;
 258         return 0;
 259 }
 260 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
 261
 262 /*
 263  * Creates modalias sysfs attribute for ACPI enumerated devices.
 264  * Because the other buses does not support ACPI HIDs & CIDs.
 265  * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
 266  * "acpi:IBM0001:ACPI0001"
 267  */
 268 int acpi_device_modalias(struct device *dev, char *buf, int size)
 269 {
 270         int len;
 271
 272         if (!acpi_companion_match(dev))
 273                 return -ENODEV;
 274
 275         len = create_modalias(ACPI_COMPANION(dev), buf, size -1);
 276         if (len <= 0)
 277                 return len;
 278         buf[len++] = '\n';
 279         return len;
 280 }
 281 EXPORT_SYMBOL_GPL(acpi_device_modalias);
 282
 283 static ssize_t
 284 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
 285         struct acpi_device *acpi_dev = to_acpi_device(dev);
 286         int len;
 287
 288         len = create_modalias(acpi_dev, buf, 1024);
 289         if (len <= 0)
 290                 return len;
 291         buf[len++] = '\n';
 292         return len;
 293 }
 294 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 295
 296 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 297 {
 298         struct acpi_device_physical_node *pn;
 299         bool offline = true;
 300
 301         mutex_lock(&adev->physical_node_lock);
 302
 303         list_for_each_entry(pn, &adev->physical_node_list, node)
 304                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
 305                         if (uevent)
 306                                 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
 307
 308                         offline = false;
 309                         break;
 310                 }
 311
 312         mutex_unlock(&adev->physical_node_lock);
 313         return offline;
 314 }
 315
 316 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 317                                     void **ret_p)
 318 {
 319         struct acpi_device *device = NULL;
 320         struct acpi_device_physical_node *pn;
 321         bool second_pass = (bool)data;
 322         acpi_status status = AE_OK;
 323
 324         if (acpi_bus_get_device(handle, &device))
 325                 return AE_OK;
 326
 327         if (device->handler && !device->handler->hotplug.enabled) {
 328                 *ret_p = &device->dev;
 329                 return AE_SUPPORT;
 330         }
 331
 332         mutex_lock(&device->physical_node_lock);
 333
 334         list_for_each_entry(pn, &device->physical_node_list, node) {
 335                 int ret;
 336
 337                 if (second_pass) {
 338                         /* Skip devices offlined by the first pass. */
 339                         if (pn->put_online)
 340                                 continue;
 341                 } else {
 342                         pn->put_online = false;
 343                 }
 344                 ret = device_offline(pn->dev);
 345                 if (acpi_force_hot_remove)
 346                         continue;
 347
 348                 if (ret >= 0) {
 349                         pn->put_online = !ret;
 350                 } else {
 351                         *ret_p = pn->dev;
 352                         if (second_pass) {
 353                                 status = AE_ERROR;
 354                                 break;
 355                         }
 356                 }
 357         }
 358
 359         mutex_unlock(&device->physical_node_lock);
 360
 361         return status;
 362 }
 363
 364 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 365                                    void **ret_p)
 366 {
 367         struct acpi_device *device = NULL;
 368         struct acpi_device_physical_node *pn;
 369
 370         if (acpi_bus_get_device(handle, &device))
 371                 return AE_OK;
 372
 373         mutex_lock(&device->physical_node_lock);
 374
 375         list_for_each_entry(pn, &device->physical_node_list, node)
 376                 if (pn->put_online) {
 377                         device_online(pn->dev);
 378                         pn->put_online = false;
 379                 }
 380
 381         mutex_unlock(&device->physical_node_lock);
 382
 383         return AE_OK;
 384 }
 385
 386 static int acpi_scan_try_to_offline(struct acpi_device *device)
 387 {
 388         acpi_handle handle = device->handle;
 389         struct device *errdev = NULL;
 390         acpi_status status;
 391
 392         /*
 393          * Carry out two passes here and ignore errors in the first pass,
 394          * because if the devices in question are memory blocks and
 395          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 396          * that the other blocks depend on, but it is not known in advance which
 397          * block holds them.
 398          *
 399          * If the first pass is successful, the second one isn't needed, though.
 400          */
 401         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 402                                      NULL, acpi_bus_offline, (void *)false,
 403                                      (void **)&errdev);
 404         if (status == AE_SUPPORT) {
 405                 dev_warn(errdev, "Offline disabled.\n");
 406                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 407                                     acpi_bus_online, NULL, NULL, NULL);
 408                 return -EPERM;
 409         }
 410         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
 411         if (errdev) {
 412                 errdev = NULL;
 413                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 414                                     NULL, acpi_bus_offline, (void *)true,
 415                                     (void **)&errdev);
 416                 if (!errdev || acpi_force_hot_remove)
 417                         acpi_bus_offline(handle, 0, (void *)true,
 418                                          (void **)&errdev);
 419
 420                 if (errdev && !acpi_force_hot_remove) {
 421                         dev_warn(errdev, "Offline failed.\n");
 422                         acpi_bus_online(handle, 0, NULL, NULL);
 423                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 424                                             ACPI_UINT32_MAX, acpi_bus_online,
 425                                             NULL, NULL, NULL);
 426                         return -EBUSY;
 427                 }
 428         }
 429         return 0;
 430 }
 431
 432 static int acpi_scan_hot_remove(struct acpi_device *device)
 433 {
 434         acpi_handle handle = device->handle;
 435         unsigned long long sta;
 436         acpi_status status;
 437
 438         if (device->handler && device->handler->hotplug.demand_offline
 439             && !acpi_force_hot_remove) {
 440                 if (!acpi_scan_is_offline(device, true))
 441                         return -EBUSY;
 442         } else {
 443                 int error = acpi_scan_try_to_offline(device);
 444                 if (error)
 445                         return error;
 446         }
 447
 448         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 449                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 450
 451         acpi_bus_trim(device);
 452
 453         acpi_evaluate_lck(handle, 0);
 454         /*
 455          * TBD: _EJD support.
 456          */
 457         status = acpi_evaluate_ej0(handle);
 458         if (status == AE_NOT_FOUND)
 459                 return -ENODEV;
 460         else if (ACPI_FAILURE(status))
 461                 return -EIO;
 462
 463         /*
 464          * Verify if eject was indeed successful.  If not, log an error
 465          * message.  No need to call _OST since _EJ0 call was made OK.
 466          */
 467         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 468         if (ACPI_FAILURE(status)) {
 469                 acpi_handle_warn(handle,
 470                         "Status check after eject failed (0x%x)\n", status);
 471         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 472                 acpi_handle_warn(handle,
 473                         "Eject incomplete - status 0x%llx\n", sta);
 474         }
 475
 476         return 0;
 477 }
 478
 479 static int acpi_scan_device_not_present(struct acpi_device *adev)
 480 {
 481         if (!acpi_device_enumerated(adev)) {
 482                 dev_warn(&adev->dev, "Still not present\n");
 483                 return -EALREADY;
 484         }
 485         acpi_bus_trim(adev);
 486         return 0;
 487 }
 488
 489 static int acpi_scan_device_check(struct acpi_device *adev)
 490 {
 491         int error;
 492
 493         acpi_bus_get_status(adev);
 494         if (adev->status.present || adev->status.functional) {
 495                 /*
 496                  * This function is only called for device objects for which
 497                  * matching scan handlers exist.  The only situation in which
 498                  * the scan handler is not attached to this device object yet
 499                  * is when the device has just appeared (either it wasn't
 500                  * present at all before or it was removed and then added
 501                  * again).
 502                  */
 503                 if (adev->handler) {
 504                         dev_warn(&adev->dev, "Already enumerated\n");
 505                         return -EALREADY;
 506                 }
 507                 error = acpi_bus_scan(adev->handle);
 508                 if (error) {
 509                         dev_warn(&adev->dev, "Namespace scan failure\n");
 510                         return error;
 511                 }
 512                 if (!adev->handler) {
 513                         dev_warn(&adev->dev, "Enumeration failure\n");
 514                         error = -ENODEV;
 515                 }
 516         } else {
 517                 error = acpi_scan_device_not_present(adev);
 518         }
 519         return error;
 520 }
 521
 522 static int acpi_scan_bus_check(struct acpi_device *adev)
 523 {
 524         struct acpi_scan_handler *handler = adev->handler;
 525         struct acpi_device *child;
 526         int error;
 527
 528         acpi_bus_get_status(adev);
 529         if (!(adev->status.present || adev->status.functional)) {
 530                 acpi_scan_device_not_present(adev);
 531                 return 0;
 532         }
 533         if (handler && handler->hotplug.scan_dependent)
 534                 return handler->hotplug.scan_dependent(adev);
 535
 536         error = acpi_bus_scan(adev->handle);
 537         if (error) {
 538                 dev_warn(&adev->dev, "Namespace scan failure\n");
 539                 return error;
 540         }
 541         list_for_each_entry(child, &adev->children, node) {
 542                 error = acpi_scan_bus_check(child);
 543                 if (error)
 544                         return error;
 545         }
 546         return 0;
 547 }
 548
 549 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 550 {
 551         switch (type) {
 552         case ACPI_NOTIFY_BUS_CHECK:
 553                 return acpi_scan_bus_check(adev);
 554         case ACPI_NOTIFY_DEVICE_CHECK:
 555                 return acpi_scan_device_check(adev);
 556         case ACPI_NOTIFY_EJECT_REQUEST:
 557         case ACPI_OST_EC_OSPM_EJECT:
 558                 if (adev->handler && !adev->handler->hotplug.enabled) {
 559                         dev_info(&adev->dev, "Eject disabled\n");
 560                         return -EPERM;
 561                 }
 562                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 563                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 564                 return acpi_scan_hot_remove(adev);
 565         }
 566         return -EINVAL;
 567 }
 568
 569 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 570 {
 571         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 572         int error = -ENODEV;
 573
 574         lock_device_hotplug();
 575         mutex_lock(&acpi_scan_lock);
 576
 577         /*
 578          * The device object's ACPI handle cannot become invalid as long as we
 579          * are holding acpi_scan_lock, but it might have become invalid before
 580          * that lock was acquired.
 581          */
 582         if (adev->handle == INVALID_ACPI_HANDLE)
 583                 goto err_out;
 584
 585         if (adev->flags.is_dock_station) {
 586                 error = dock_notify(adev, src);
 587         } else if (adev->flags.hotplug_notify) {
 588                 error = acpi_generic_hotplug_event(adev, src);
 589                 if (error == -EPERM) {
 590                         ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 591                         goto err_out;
 592                 }
 593         } else {
 594                 int (*notify)(struct acpi_device *, u32);
 595
 596                 acpi_lock_hp_context();
 597                 notify = adev->hp ? adev->hp->notify : NULL;
 598                 acpi_unlock_hp_context();
 599                 /*
 600                  * There may be additional notify handlers for device objects
 601                  * without the .event() callback, so ignore them here.
 602                  */
 603                 if (notify)
 604                         error = notify(adev, src);
 605                 else
 606                         goto out;
 607         }
 608         if (!error)
 609                 ost_code = ACPI_OST_SC_SUCCESS;
 610
 611  err_out:
 612         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 613
 614  out:
 615         acpi_bus_put_acpi_device(adev);
 616         mutex_unlock(&acpi_scan_lock);
 617         unlock_device_hotplug();
 618 }
 619
 620 static ssize_t real_power_state_show(struct device *dev,
 621                                      struct device_attribute *attr, char *buf)
 622 {
 623         struct acpi_device *adev = to_acpi_device(dev);
 624         int state;
 625         int ret;
 626
 627         ret = acpi_device_get_power(adev, &state);
 628         if (ret)
 629                 return ret;
 630
 631         return sprintf(buf, "%s\n", acpi_power_state_string(state));
 632 }
 633
 634 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 635
 636 static ssize_t power_state_show(struct device *dev,
 637                                 struct device_attribute *attr, char *buf)
 638 {
 639         struct acpi_device *adev = to_acpi_device(dev);
 640
 641         return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 642 }
 643
 644 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 645
 646 static ssize_t
 647 acpi_eject_store(struct device *d, struct device_attribute *attr,
 648                 const char *buf, size_t count)
 649 {
 650         struct acpi_device *acpi_device = to_acpi_device(d);
 651         acpi_object_type not_used;
 652         acpi_status status;
 653
 654         if (!count || buf[0] != '1')
 655                 return -EINVAL;
 656
 657         if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
 658             && !acpi_device->driver)
 659                 return -ENODEV;
 660
 661         status = acpi_get_type(acpi_device->handle, &not_used);
 662         if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
 663                 return -ENODEV;
 664
 665         get_device(&acpi_device->dev);
 666         status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
 667         if (ACPI_SUCCESS(status))
 668                 return count;
 669
 670         put_device(&acpi_device->dev);
 671         acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
 672                           ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 673         return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
 674 }
 675
 676 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 677
 678 static ssize_t
 679 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 680         struct acpi_device *acpi_dev = to_acpi_device(dev);
 681
 682         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 683 }
 684 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 685
 686 static ssize_t acpi_device_uid_show(struct device *dev,
 687                                     struct device_attribute *attr, char *buf)
 688 {
 689         struct acpi_device *acpi_dev = to_acpi_device(dev);
 690
 691         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 692 }
 693 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 694
 695 static ssize_t acpi_device_adr_show(struct device *dev,
 696                                     struct device_attribute *attr, char *buf)
 697 {
 698         struct acpi_device *acpi_dev = to_acpi_device(dev);
 699
 700         return sprintf(buf, "0x%08x\n",
 701                        (unsigned int)(acpi_dev->pnp.bus_address));
 702 }
 703 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 704
 705 static ssize_t
 706 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 707         struct acpi_device *acpi_dev = to_acpi_device(dev);
 708         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 709         int result;
 710
 711         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 712         if (result)
 713                 goto end;
 714
 715         result = sprintf(buf, "%s\n", (char*)path.pointer);
 716         kfree(path.pointer);
 717 end:
 718         return result;
 719 }
 720 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 721
 722 /* sysfs file that shows description text from the ACPI _STR method */
 723 static ssize_t description_show(struct device *dev,
 724                                 struct device_attribute *attr,
 725                                 char *buf) {
 726         struct acpi_device *acpi_dev = to_acpi_device(dev);
 727         int result;
 728
 729         if (acpi_dev->pnp.str_obj == NULL)
 730                 return 0;
 731
 732         /*
 733          * The _STR object contains a Unicode identifier for a device.
 734          * We need to convert to utf-8 so it can be displayed.
 735          */
 736         result = utf16s_to_utf8s(
 737                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 738                 acpi_dev->pnp.str_obj->buffer.length,
 739                 UTF16_LITTLE_ENDIAN, buf,
 740                 PAGE_SIZE);
 741
 742         buf[result++] = '\n';
 743
 744         return result;
 745 }
 746 static DEVICE_ATTR(description, 0444, description_show, NULL);
 747
 748 static ssize_t
 749 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 750                      char *buf) {
 751         struct acpi_device *acpi_dev = to_acpi_device(dev);
 752         acpi_status status;
 753         unsigned long long sun;
 754
 755         status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun);
 756         if (ACPI_FAILURE(status))
 757                 return -ENODEV;
 758
 759         return sprintf(buf, "%llu\n", sun);
 760 }
 761 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 762
 763 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
 764                                 char *buf) {
 765         struct acpi_device *acpi_dev = to_acpi_device(dev);
 766         acpi_status status;
 767         unsigned long long sta;
 768
 769         status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
 770         if (ACPI_FAILURE(status))
 771                 return -ENODEV;
 772
 773         return sprintf(buf, "%llu\n", sta);
 774 }
 775 static DEVICE_ATTR_RO(status);
 776
 777 static int acpi_device_setup_files(struct acpi_device *dev)
 778 {
 779         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 780         acpi_status status;
 781         int result = 0;
 782
 783         /*
 784          * Devices gotten from FADT don't have a "path" attribute
 785          */
 786         if (dev->handle) {
 787                 result = device_create_file(&dev->dev, &dev_attr_path);
 788                 if (result)
 789                         goto end;
 790         }
 791
 792         if (!list_empty(&dev->pnp.ids)) {
 793                 result = device_create_file(&dev->dev, &dev_attr_hid);
 794                 if (result)
 795                         goto end;
 796
 797                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 798                 if (result)
 799                         goto end;
 800         }
 801
 802         /*
 803          * If device has _STR, 'description' file is created
 804          */
 805         if (acpi_has_method(dev->handle, "_STR")) {
 806                 status = acpi_evaluate_object(dev->handle, "_STR",
 807                                         NULL, &buffer);
 808                 if (ACPI_FAILURE(status))
 809                         buffer.pointer = NULL;
 810                 dev->pnp.str_obj = buffer.pointer;
 811                 result = device_create_file(&dev->dev, &dev_attr_description);
 812                 if (result)
 813                         goto end;
 814         }
 815
 816         if (dev->pnp.type.bus_address)
 817                 result = device_create_file(&dev->dev, &dev_attr_adr);
 818         if (dev->pnp.unique_id)
 819                 result = device_create_file(&dev->dev, &dev_attr_uid);
 820
 821         if (acpi_has_method(dev->handle, "_SUN")) {
 822                 result = device_create_file(&dev->dev, &dev_attr_sun);
 823                 if (result)
 824                         goto end;
 825         }
 826
 827         if (acpi_has_method(dev->handle, "_STA")) {
 828                 result = device_create_file(&dev->dev, &dev_attr_status);
 829                 if (result)
 830                         goto end;
 831         }
 832
 833         /*
 834          * If device has _EJ0, 'eject' file is created that is used to trigger
 835          * hot-removal function from userland.
 836          */
 837         if (acpi_has_method(dev->handle, "_EJ0")) {
 838                 result = device_create_file(&dev->dev, &dev_attr_eject);
 839                 if (result)
 840                         return result;
 841         }
 842
 843         if (dev->flags.power_manageable) {
 844                 result = device_create_file(&dev->dev, &dev_attr_power_state);
 845                 if (result)
 846                         return result;
 847
 848                 if (dev->power.flags.power_resources)
 849                         result = device_create_file(&dev->dev,
 850                                                     &dev_attr_real_power_state);
 851         }
 852
 853 end:
 854         return result;
 855 }
 856
 857 static void acpi_device_remove_files(struct acpi_device *dev)
 858 {
 859         if (dev->flags.power_manageable) {
 860                 device_remove_file(&dev->dev, &dev_attr_power_state);
 861                 if (dev->power.flags.power_resources)
 862                         device_remove_file(&dev->dev,
 863                                            &dev_attr_real_power_state);
 864         }
 865
 866         /*
 867          * If device has _STR, remove 'description' file
 868          */
 869         if (acpi_has_method(dev->handle, "_STR")) {
 870                 kfree(dev->pnp.str_obj);
 871                 device_remove_file(&dev->dev, &dev_attr_description);
 872         }
 873         /*
 874          * If device has _EJ0, remove 'eject' file.
 875          */
 876         if (acpi_has_method(dev->handle, "_EJ0"))
 877                 device_remove_file(&dev->dev, &dev_attr_eject);
 878
 879         if (acpi_has_method(dev->handle, "_SUN"))
 880                 device_remove_file(&dev->dev, &dev_attr_sun);
 881
 882         if (dev->pnp.unique_id)
 883                 device_remove_file(&dev->dev, &dev_attr_uid);
 884         if (dev->pnp.type.bus_address)
 885                 device_remove_file(&dev->dev, &dev_attr_adr);
 886         device_remove_file(&dev->dev, &dev_attr_modalias);
 887         device_remove_file(&dev->dev, &dev_attr_hid);
 888         if (acpi_has_method(dev->handle, "_STA"))
 889                 device_remove_file(&dev->dev, &dev_attr_status);
 890         if (dev->handle)
 891                 device_remove_file(&dev->dev, &dev_attr_path);
 892 }
 893 /* --------------------------------------------------------------------------
 894                         ACPI Bus operations
 895    -------------------------------------------------------------------------- */
 896
 897 static const struct acpi_device_id *__acpi_match_device(
 898         struct acpi_device *device, const struct acpi_device_id *ids)
 899 {
 900         const struct acpi_device_id *id;
 901         struct acpi_hardware_id *hwid;
 902
 903         /*
 904          * If the device is not present, it is unnecessary to load device
 905          * driver for it.
 906          */
 907         if (!device->status.present)
 908                 return NULL;
 909
 910         for (id = ids; id->id[0]; id++)
 911                 list_for_each_entry(hwid, &device->pnp.ids, list)
 912                         if (!strcmp((char *) id->id, hwid->id))
 913                                 return id;
 914
 915         return NULL;
 916 }
 917
 918 /**
 919  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 920  * @ids: Array of struct acpi_device_id object to match against.
 921  * @dev: The device structure to match.
 922  *
 923  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 924  * object for that handle and use that object to match against a given list of
 925  * device IDs.
 926  *
 927  * Return a pointer to the first matching ID on success or %NULL on failure.
 928  */
 929 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 930                                                const struct device *dev)
 931 {
 932         struct acpi_device *adev;
 933         acpi_handle handle = ACPI_HANDLE(dev);
 934
 935         if (!ids || !handle || acpi_bus_get_device(handle, &adev))
 936                 return NULL;
 937
 938         if (!acpi_companion_match(dev))
 939                 return NULL;
 940
 941         return __acpi_match_device(adev, ids);
 942 }
 943 EXPORT_SYMBOL_GPL(acpi_match_device);
 944
 945 int acpi_match_device_ids(struct acpi_device *device,
 946                           const struct acpi_device_id *ids)
 947 {
 948         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 949 }
 950 EXPORT_SYMBOL(acpi_match_device_ids);
 951
 952 /**
 953  * acpi_of_match_device - Match device using the "compatible" property.
 954  * @dev: Device to match.
 955  * @of_match_table: List of device IDs to match against.
 956  *
 957  * If @dev has an ACPI companion which has the special PRP0001 device ID in its
 958  * list of identifiers and a _DSD object with the "compatible" property, use
 959  * that property to match against the given list of identifiers.
 960  */
 961 static bool acpi_of_match_device(struct device *dev,
 962                                  const struct of_device_id *of_match_table)
 963 {
 964         const union acpi_object *of_compatible, *obj;
 965         struct acpi_device *adev;
 966         int i, nval;
 967
 968         adev = ACPI_COMPANION(dev);
 969         if (!adev)
 970                 return false;
 971
 972         of_compatible = adev->data.of_compatible;
 973         if (!of_match_table || !of_compatible)
 974                 return false;
 975
 976         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 977                 nval = of_compatible->package.count;
 978                 obj = of_compatible->package.elements;
 979         } else { /* Must be ACPI_TYPE_STRING. */
 980                 nval = 1;
 981                 obj = of_compatible;
 982         }
 983         /* Now we can look for the driver DT compatible strings */
 984         for (i = 0; i < nval; i++, obj++) {
 985                 const struct of_device_id *id;
 986
 987                 for (id = of_match_table; id->compatible[0]; id++)
 988                         if (!strcasecmp(obj->string.pointer, id->compatible))
 989                                 return true;
 990         }
 991
 992         return false;
 993 }
 994
 995 bool acpi_driver_match_device(struct device *dev,
 996                               const struct device_driver *drv)
 997 {
 998         if (!drv->acpi_match_table)
 999                 return acpi_of_match_device(dev, drv->of_match_table);
1000
1001         return !!acpi_match_device(drv->acpi_match_table, dev);
1002 }
1003 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
1004
1005 static void acpi_free_power_resources_lists(struct acpi_device *device)
1006 {
1007         int i;
1008
1009         if (device->wakeup.flags.valid)
1010                 acpi_power_resources_list_free(&device->wakeup.resources);
1011
1012         if (!device->power.flags.power_resources)
1013                 return;
1014
1015         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1016                 struct acpi_device_power_state *ps = &device->power.states[i];
1017                 acpi_power_resources_list_free(&ps->resources);
1018         }
1019 }
1020
1021 static void acpi_device_release(struct device *dev)
1022 {
1023         struct acpi_device *acpi_dev = to_acpi_device(dev);
1024
1025         acpi_free_properties(acpi_dev);
1026         acpi_free_pnp_ids(&acpi_dev->pnp);
1027         acpi_free_power_resources_lists(acpi_dev);
1028         kfree(acpi_dev);
1029 }
1030
1031 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
1032 {
1033         struct acpi_device *acpi_dev = to_acpi_device(dev);
1034         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1035
1036         return acpi_dev->flags.match_driver
1037                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1038 }
1039
1040 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
1041 {
1042         struct acpi_device *acpi_dev = to_acpi_device(dev);
1043         int len;
1044
1045         if (list_empty(&acpi_dev->pnp.ids))
1046                 return 0;
1047
1048         if (add_uevent_var(env, "MODALIAS="))
1049                 return -ENOMEM;
1050         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
1051                               sizeof(env->buf) - env->buflen);
1052         if (len <= 0)
1053                 return len;
1054         env->buflen += len;
1055         return 0;
1056 }
1057
1058 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
1059 {
1060         struct acpi_device *device = data;
1061
1062         device->driver->ops.notify(device, event);
1063 }
1064
1065 static void acpi_device_notify_fixed(void *data)
1066 {
1067         struct acpi_device *device = data;
1068
1069         /* Fixed hardware devices have no handles */
1070         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
1071 }
1072
1073 static u32 acpi_device_fixed_event(void *data)
1074 {
1075         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
1076         return ACPI_INTERRUPT_HANDLED;
1077 }
1078
1079 static int acpi_device_install_notify_handler(struct acpi_device *device)
1080 {
1081         acpi_status status;
1082
1083         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
1084                 status =
1085                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
1086                                                      acpi_device_fixed_event,
1087                                                      device);
1088         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
1089                 status =
1090                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
1091                                                      acpi_device_fixed_event,
1092                                                      device);
1093         else
1094                 status = acpi_install_notify_handler(device->handle,
1095                                                      ACPI_DEVICE_NOTIFY,
1096                                                      acpi_device_notify,
1097                                                      device);
1098
1099         if (ACPI_FAILURE(status))
1100                 return -EINVAL;
1101         return 0;
1102 }
1103
1104 static void acpi_device_remove_notify_handler(struct acpi_device *device)
1105 {
1106         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
1107                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
1108                                                 acpi_device_fixed_event);
1109         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
1110                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
1111                                                 acpi_device_fixed_event);
1112         else
1113                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1114                                            acpi_device_notify);
1115 }
1116
1117 static int acpi_device_probe(struct device *dev)
1118 {
1119         struct acpi_device *acpi_dev = to_acpi_device(dev);
1120         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1121         int ret;
1122
1123         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1124                 return -EINVAL;
1125
1126         if (!acpi_drv->ops.add)
1127                 return -ENOSYS;
1128
1129         ret = acpi_drv->ops.add(acpi_dev);
1130         if (ret)
1131                 return ret;
1132
1133         acpi_dev->driver = acpi_drv;
1134         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1135                           "Driver [%s] successfully bound to device [%s]\n",
1136                           acpi_drv->name, acpi_dev->pnp.bus_id));
1137
1138         if (acpi_drv->ops.notify) {
1139                 ret = acpi_device_install_notify_handler(acpi_dev);
1140                 if (ret) {
1141                         if (acpi_drv->ops.remove)
1142                                 acpi_drv->ops.remove(acpi_dev);
1143
1144                         acpi_dev->driver = NULL;
1145                         acpi_dev->driver_data = NULL;
1146                         return ret;
1147                 }
1148         }
1149
1150         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1151                           acpi_drv->name, acpi_dev->pnp.bus_id));
1152         get_device(dev);
1153         return 0;
1154 }
1155
1156 static int acpi_device_remove(struct device * dev)
1157 {
1158         struct acpi_device *acpi_dev = to_acpi_device(dev);
1159         struct acpi_driver *acpi_drv = acpi_dev->driver;
1160
1161         if (acpi_drv) {
1162                 if (acpi_drv->ops.notify)
1163                         acpi_device_remove_notify_handler(acpi_dev);
1164                 if (acpi_drv->ops.remove)
1165                         acpi_drv->ops.remove(acpi_dev);
1166         }
1167         acpi_dev->driver = NULL;
1168         acpi_dev->driver_data = NULL;
1169
1170         put_device(dev);
1171         return 0;
1172 }
1173
1174 struct bus_type acpi_bus_type = {
1175         .name           = "acpi",
1176         .match          = acpi_bus_match,
1177         .probe          = acpi_device_probe,
1178         .remove         = acpi_device_remove,
1179         .uevent         = acpi_device_uevent,
1180 };
1181
1182 static void acpi_device_del(struct acpi_device *device)
1183 {
1184         mutex_lock(&acpi_device_lock);
1185         if (device->parent)
1186                 list_del(&device->node);
1187
1188         list_del(&device->wakeup_list);
1189         mutex_unlock(&acpi_device_lock);
1190
1191         acpi_power_add_remove_device(device, false);
1192         acpi_device_remove_files(device);
1193         if (device->remove)
1194                 device->remove(device);
1195
1196         device_del(&device->dev);
1197 }
1198
1199 static LIST_HEAD(acpi_device_del_list);
1200 static DEFINE_MUTEX(acpi_device_del_lock);
1201
1202 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1203 {
1204         for (;;) {
1205                 struct acpi_device *adev;
1206
1207                 mutex_lock(&acpi_device_del_lock);
1208
1209                 if (list_empty(&acpi_device_del_list)) {
1210                         mutex_unlock(&acpi_device_del_lock);
1211                         break;
1212                 }
1213                 adev = list_first_entry(&acpi_device_del_list,
1214                                         struct acpi_device, del_list);
1215                 list_del(&adev->del_list);
1216
1217                 mutex_unlock(&acpi_device_del_lock);
1218
1219                 acpi_device_del(adev);
1220                 /*
1221                  * Drop references to all power resources that might have been
1222                  * used by the device.
1223                  */
1224                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1225                 put_device(&adev->dev);
1226         }
1227 }
1228
1229 /**
1230  * acpi_scan_drop_device - Drop an ACPI device object.
1231  * @handle: Handle of an ACPI namespace node, not used.
1232  * @context: Address of the ACPI device object to drop.
1233  *
1234  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1235  * namespace node the device object pointed to by @context is attached to.
1236  *
1237  * The unregistration is carried out asynchronously to avoid running
1238  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1239  * ensure the correct ordering (the device objects must be unregistered in the
1240  * same order in which the corresponding namespace nodes are deleted).
1241  */
1242 static void acpi_scan_drop_device(acpi_handle handle, void *context)
1243 {
1244         static DECLARE_WORK(work, acpi_device_del_work_fn);
1245         struct acpi_device *adev = context;
1246
1247         mutex_lock(&acpi_device_del_lock);
1248
1249         /*
1250          * Use the ACPI hotplug workqueue which is ordered, so this work item
1251          * won't run after any hotplug work items submitted subsequently.  That
1252          * prevents attempts to register device objects identical to those being
1253          * deleted from happening concurrently (such attempts result from
1254          * hotplug events handled via the ACPI hotplug workqueue).  It also will
1255          * run after all of the work items submitted previosuly, which helps
1256          * those work items to ensure that they are not accessing stale device
1257          * objects.
1258          */
1259         if (list_empty(&acpi_device_del_list))
1260                 acpi_queue_hotplug_work(&work);
1261
1262         list_add_tail(&adev->del_list, &acpi_device_del_list);
1263         /* Make acpi_ns_validate_handle() return NULL for this handle. */
1264         adev->handle = INVALID_ACPI_HANDLE;
1265
1266         mutex_unlock(&acpi_device_del_lock);
1267 }
1268
1269 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
1270                                 void (*callback)(void *))
1271 {
1272         acpi_status status;
1273
1274         if (!device)
1275                 return -EINVAL;
1276
1277         status = acpi_get_data_full(handle, acpi_scan_drop_device,
1278                                     (void **)device, callback);
1279         if (ACPI_FAILURE(status) || !*device) {
1280                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1281                                   handle));
1282                 return -ENODEV;
1283         }
1284         return 0;
1285 }
1286
1287 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1288 {
1289         return acpi_get_device_data(handle, device, NULL);
1290 }
1291 EXPORT_SYMBOL(acpi_bus_get_device);
1292
1293 static void get_acpi_device(void *dev)
1294 {
1295         if (dev)
1296                 get_device(&((struct acpi_device *)dev)->dev);
1297 }
1298
1299 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
1300 {
1301         struct acpi_device *adev = NULL;
1302
1303         acpi_get_device_data(handle, &adev, get_acpi_device);
1304         return adev;
1305 }
1306
1307 void acpi_bus_put_acpi_device(struct acpi_device *adev)
1308 {
1309         put_device(&adev->dev);
1310 }
1311
1312 int acpi_device_add(struct acpi_device *device,
1313                     void (*release)(struct device *))
1314 {
1315         int result;
1316         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1317         int found = 0;
1318
1319         if (device->handle) {
1320                 acpi_status status;
1321
1322                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1323                                           device);
1324                 if (ACPI_FAILURE(status)) {
1325                         acpi_handle_err(device->handle,
1326                                         "Unable to attach device data\n");
1327                         return -ENODEV;
1328                 }
1329         }
1330
1331         /*
1332          * Linkage
1333          * -------
1334          * Link this device to its parent and siblings.
1335          */
1336         INIT_LIST_HEAD(&device->children);
1337         INIT_LIST_HEAD(&device->node);
1338         INIT_LIST_HEAD(&device->wakeup_list);
1339         INIT_LIST_HEAD(&device->physical_node_list);
1340         INIT_LIST_HEAD(&device->del_list);
1341         mutex_init(&device->physical_node_lock);
1342
1343         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1344         if (!new_bus_id) {
1345                 pr_err(PREFIX "Memory allocation error\n");
1346                 result = -ENOMEM;
1347                 goto err_detach;
1348         }
1349
1350         mutex_lock(&acpi_device_lock);
1351         /*
1352          * Find suitable bus_id and instance number in acpi_bus_id_list
1353          * If failed, create one and link it into acpi_bus_id_list
1354          */
1355         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1356                 if (!strcmp(acpi_device_bus_id->bus_id,
1357                             acpi_device_hid(device))) {
1358                         acpi_device_bus_id->instance_no++;
1359                         found = 1;
1360                         kfree(new_bus_id);
1361                         break;
1362                 }
1363         }
1364         if (!found) {
1365                 acpi_device_bus_id = new_bus_id;
1366                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1367                 acpi_device_bus_id->instance_no = 0;
1368                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1369         }
1370         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1371
1372         if (device->parent)
1373                 list_add_tail(&device->node, &device->parent->children);
1374
1375         if (device->wakeup.flags.valid)
1376                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1377         mutex_unlock(&acpi_device_lock);
1378
1379         if (device->parent)
1380                 device->dev.parent = &device->parent->dev;
1381         device->dev.bus = &acpi_bus_type;
1382         device->dev.release = release;
1383         result = device_add(&device->dev);
1384         if (result) {
1385                 dev_err(&device->dev, "Error registering device\n");
1386                 goto err;
1387         }
1388
1389         result = acpi_device_setup_files(device);
1390         if (result)
1391                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1392                        dev_name(&device->dev));
1393
1394         return 0;
1395
1396  err:
1397         mutex_lock(&acpi_device_lock);
1398         if (device->parent)
1399                 list_del(&device->node);
1400         list_del(&device->wakeup_list);
1401         mutex_unlock(&acpi_device_lock);
1402
1403  err_detach:
1404         acpi_detach_data(device->handle, acpi_scan_drop_device);
1405         return result;
1406 }
1407
1408 struct acpi_device *acpi_get_next_child(struct device *dev,
1409                                         struct acpi_device *child)
1410 {
1411         struct acpi_device *adev = ACPI_COMPANION(dev);
1412         struct list_head *head, *next;
1413
1414         if (!adev)
1415                 return NULL;
1416
1417         head = &adev->children;
1418         if (list_empty(head))
1419                 return NULL;
1420
1421         if (!child)
1422                 return list_first_entry(head, struct acpi_device, node);
1423
1424         next = child->node.next;
1425         return next == head ? NULL : list_entry(next, struct acpi_device, node);
1426 }
1427
1428 /* --------------------------------------------------------------------------
1429                                  Driver Management
1430    -------------------------------------------------------------------------- */
1431 /**
1432  * acpi_bus_register_driver - register a driver with the ACPI bus
1433  * @driver: driver being registered
1434  *
1435  * Registers a driver with the ACPI bus.  Searches the namespace for all
1436  * devices that match the driver's criteria and binds.  Returns zero for
1437  * success or a negative error status for failure.
1438  */
1439 int acpi_bus_register_driver(struct acpi_driver *driver)
1440 {
1441         int ret;
1442
1443         if (acpi_disabled)
1444                 return -ENODEV;
1445         driver->drv.name = driver->name;
1446         driver->drv.bus = &acpi_bus_type;
1447         driver->drv.owner = driver->owner;
1448
1449         ret = driver_register(&driver->drv);
1450         return ret;
1451 }
1452
1453 EXPORT_SYMBOL(acpi_bus_register_driver);
1454
1455 /**
1456  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1457  * @driver: driver to unregister
1458  *
1459  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
1460  * devices that match the driver's criteria and unbinds.
1461  */
1462 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1463 {
1464         driver_unregister(&driver->drv);
1465 }
1466
1467 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1468
1469 /* --------------------------------------------------------------------------
1470                                  Device Enumeration
1471    -------------------------------------------------------------------------- */
1472 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1473 {
1474         struct acpi_device *device = NULL;
1475         acpi_status status;
1476
1477         /*
1478          * Fixed hardware devices do not appear in the namespace and do not
1479          * have handles, but we fabricate acpi_devices for them, so we have
1480          * to deal with them specially.
1481          */
1482         if (!handle)
1483                 return acpi_root;
1484
1485         do {
1486                 status = acpi_get_parent(handle, &handle);
1487                 if (ACPI_FAILURE(status))
1488                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
1489         } while (acpi_bus_get_device(handle, &device));
1490         return device;
1491 }
1492
1493 acpi_status
1494 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1495 {
1496         acpi_status status;
1497         acpi_handle tmp;
1498         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1499         union acpi_object *obj;
1500
1501         status = acpi_get_handle(handle, "_EJD", &tmp);
1502         if (ACPI_FAILURE(status))
1503                 return status;
1504
1505         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1506         if (ACPI_SUCCESS(status)) {
1507                 obj = buffer.pointer;
1508                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1509                                          ejd);
1510                 kfree(buffer.pointer);
1511         }
1512         return status;
1513 }
1514 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1515
1516 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1517                                         struct acpi_device_wakeup *wakeup)
1518 {
1519         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1520         union acpi_object *package = NULL;
1521         union acpi_object *element = NULL;
1522         acpi_status status;
1523         int err = -ENODATA;
1524
1525         if (!wakeup)
1526                 return -EINVAL;
1527
1528         INIT_LIST_HEAD(&wakeup->resources);
1529
1530         /* _PRW */
1531         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1532         if (ACPI_FAILURE(status)) {
1533                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1534                 return err;
1535         }
1536
1537         package = (union acpi_object *)buffer.pointer;
1538
1539         if (!package || package->package.count < 2)
1540                 goto out;
1541
1542         element = &(package->package.elements[0]);
1543         if (!element)
1544                 goto out;
1545
1546         if (element->type == ACPI_TYPE_PACKAGE) {
1547                 if ((element->package.count < 2) ||
1548                     (element->package.elements[0].type !=
1549                      ACPI_TYPE_LOCAL_REFERENCE)
1550                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1551                         goto out;
1552
1553                 wakeup->gpe_device =
1554                     element->package.elements[0].reference.handle;
1555                 wakeup->gpe_number =
1556                     (u32) element->package.elements[1].integer.value;
1557         } else if (element->type == ACPI_TYPE_INTEGER) {
1558                 wakeup->gpe_device = NULL;
1559                 wakeup->gpe_number = element->integer.value;
1560         } else {
1561                 goto out;
1562         }
1563
1564         element = &(package->package.elements[1]);
1565         if (element->type != ACPI_TYPE_INTEGER)
1566                 goto out;
1567
1568         wakeup->sleep_state = element->integer.value;
1569
1570         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1571         if (err)
1572                 goto out;
1573
1574         if (!list_empty(&wakeup->resources)) {
1575                 int sleep_state;
1576
1577                 err = acpi_power_wakeup_list_init(&wakeup->resources,
1578                                                   &sleep_state);
1579                 if (err) {
1580                         acpi_handle_warn(handle, "Retrieving current states "
1581                                          "of wakeup power resources failed\n");
1582                         acpi_power_resources_list_free(&wakeup->resources);
1583                         goto out;
1584                 }
1585                 if (sleep_state < wakeup->sleep_state) {
1586                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
1587                                          "(S%d) by S%d from power resources\n",
1588                                          (int)wakeup->sleep_state, sleep_state);
1589                         wakeup->sleep_state = sleep_state;
1590                 }
1591         }
1592
1593  out:
1594         kfree(buffer.pointer);
1595         return err;
1596 }
1597
1598 static void acpi_wakeup_gpe_init(struct acpi_device *device)
1599 {
1600         struct acpi_device_id button_device_ids[] = {
1601                 {"PNP0C0C", 0},
1602                 {"PNP0C0D", 0},
1603                 {"PNP0C0E", 0},
1604                 {"", 0},
1605         };
1606         struct acpi_device_wakeup *wakeup = &device->wakeup;
1607         acpi_status status;
1608         acpi_event_status event_status;
1609
1610         wakeup->flags.notifier_present = 0;
1611
1612         /* Power button, Lid switch always enable wakeup */
1613         if (!acpi_match_device_ids(device, button_device_ids)) {
1614                 wakeup->flags.run_wake = 1;
1615                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1616                         /* Do not use Lid/sleep button for S5 wakeup */
1617                         if (wakeup->sleep_state == ACPI_STATE_S5)
1618                                 wakeup->sleep_state = ACPI_STATE_S4;
1619                 }
1620                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
1621                 device_set_wakeup_capable(&device->dev, true);
1622                 return;
1623         }
1624
1625         acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
1626                                 wakeup->gpe_number);
1627         status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
1628                                      &event_status);
1629         if (ACPI_FAILURE(status))
1630                 return;
1631
1632         wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
1633 }
1634
1635 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1636 {
1637         int err;
1638
1639         /* Presence of _PRW indicates wake capable */
1640         if (!acpi_has_method(device->handle, "_PRW"))
1641                 return;
1642
1643         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1644                                                            &device->wakeup);
1645         if (err) {
1646                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1647                 return;
1648         }
1649
1650         device->wakeup.flags.valid = 1;
1651         device->wakeup.prepare_count = 0;
1652         acpi_wakeup_gpe_init(device);
1653         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1654          * system for the ACPI device with the _PRW object.
1655          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1656          * So it is necessary to call _DSW object first. Only when it is not
1657          * present will the _PSW object used.
1658          */
1659         err = acpi_device_sleep_wake(device, 0, 0, 0);
1660         if (err)
1661                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1662                                 "error in _DSW or _PSW evaluation\n"));
1663 }
1664
1665 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1666 {
1667         struct acpi_device_power_state *ps = &device->power.states[state];
1668         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1669         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1670         acpi_status status;
1671
1672         INIT_LIST_HEAD(&ps->resources);
1673
1674         /* Evaluate "_PRx" to get referenced power resources */
1675         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1676         if (ACPI_SUCCESS(status)) {
1677                 union acpi_object *package = buffer.pointer;
1678
1679                 if (buffer.length && package
1680                     && package->type == ACPI_TYPE_PACKAGE
1681                     && package->package.count) {
1682                         int err = acpi_extract_power_resources(package, 0,
1683                                                                &ps->resources);
1684                         if (!err)
1685                                 device->power.flags.power_resources = 1;
1686                 }
1687                 ACPI_FREE(buffer.pointer);
1688         }
1689
1690         /* Evaluate "_PSx" to see if we can do explicit sets */
1691         pathname[2] = 'S';
1692         if (acpi_has_method(device->handle, pathname))
1693                 ps->flags.explicit_set = 1;
1694
1695         /*
1696          * State is valid if there are means to put the device into it.
1697          * D3hot is only valid if _PR3 present.
1698          */
1699         if (!list_empty(&ps->resources)
1700             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1701                 ps->flags.valid = 1;
1702                 ps->flags.os_accessible = 1;
1703         }
1704
1705         ps->power = -1;         /* Unknown - driver assigned */
1706         ps->latency = -1;       /* Unknown - driver assigned */
1707 }
1708
1709 static void acpi_bus_get_power_flags(struct acpi_device *device)
1710 {
1711         u32 i;
1712
1713         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1714         if (!acpi_has_method(device->handle, "_PS0") &&
1715             !acpi_has_method(device->handle, "_PR0"))
1716                 return;
1717
1718         device->flags.power_manageable = 1;
1719
1720         /*
1721          * Power Management Flags
1722          */
1723         if (acpi_has_method(device->handle, "_PSC"))
1724                 device->power.flags.explicit_get = 1;
1725
1726         if (acpi_has_method(device->handle, "_IRC"))
1727                 device->power.flags.inrush_current = 1;
1728
1729         if (acpi_has_method(device->handle, "_DSW"))
1730                 device->power.flags.dsw_present = 1;
1731
1732         /*
1733          * Enumerate supported power management states
1734          */
1735         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1736                 acpi_bus_init_power_state(device, i);
1737
1738         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1739
1740         /* Set defaults for D0 and D3 states (always valid) */
1741         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1742         device->power.states[ACPI_STATE_D0].power = 100;
1743         device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1744         device->power.states[ACPI_STATE_D3_COLD].power = 0;
1745
1746         /* Set D3cold's explicit_set flag if _PS3 exists. */
1747         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1748                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1749
1750         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1751         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1752                         device->power.flags.power_resources)
1753                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1754
1755         if (acpi_bus_init_power(device))
1756                 device->flags.power_manageable = 0;
1757 }
1758
1759 static void acpi_bus_get_flags(struct acpi_device *device)
1760 {
1761         /* Presence of _STA indicates 'dynamic_status' */
1762         if (acpi_has_method(device->handle, "_STA"))
1763                 device->flags.dynamic_status = 1;
1764
1765         /* Presence of _RMV indicates 'removable' */
1766         if (acpi_has_method(device->handle, "_RMV"))
1767                 device->flags.removable = 1;
1768
1769         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1770         if (acpi_has_method(device->handle, "_EJD") ||
1771             acpi_has_method(device->handle, "_EJ0"))
1772                 device->flags.ejectable = 1;
1773 }
1774
1775 static void acpi_device_get_busid(struct acpi_device *device)
1776 {
1777         char bus_id[5] = { '?', 0 };
1778         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1779         int i = 0;
1780
1781         /*
1782          * Bus ID
1783          * ------
1784          * The device's Bus ID is simply the object name.
1785          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1786          */
1787         if (ACPI_IS_ROOT_DEVICE(device)) {
1788                 strcpy(device->pnp.bus_id, "ACPI");
1789                 return;
1790         }
1791
1792         switch (device->device_type) {
1793         case ACPI_BUS_TYPE_POWER_BUTTON:
1794                 strcpy(device->pnp.bus_id, "PWRF");
1795                 break;
1796         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1797                 strcpy(device->pnp.bus_id, "SLPF");
1798                 break;
1799         default:
1800                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1801                 /* Clean up trailing underscores (if any) */
1802                 for (i = 3; i > 1; i--) {
1803                         if (bus_id[i] == '_')
1804                                 bus_id[i] = '\0';
1805                         else
1806                                 break;
1807                 }
1808                 strcpy(device->pnp.bus_id, bus_id);
1809                 break;
1810         }
1811 }
1812
1813 /*
1814  * acpi_ata_match - see if an acpi object is an ATA device
1815  *
1816  * If an acpi object has one of the ACPI ATA methods defined,
1817  * then we can safely call it an ATA device.
1818  */
1819 bool acpi_ata_match(acpi_handle handle)
1820 {
1821         return acpi_has_method(handle, "_GTF") ||
1822                acpi_has_method(handle, "_GTM") ||
1823                acpi_has_method(handle, "_STM") ||
1824                acpi_has_method(handle, "_SDD");
1825 }
1826
1827 /*
1828  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1829  *
1830  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1831  * then we can safely call it an ejectable drive bay
1832  */
1833 bool acpi_bay_match(acpi_handle handle)
1834 {
1835         acpi_handle phandle;
1836
1837         if (!acpi_has_method(handle, "_EJ0"))
1838                 return false;
1839         if (acpi_ata_match(handle))
1840                 return true;
1841         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1842                 return false;
1843
1844         return acpi_ata_match(phandle);
1845 }
1846
1847 bool acpi_device_is_battery(struct acpi_device *adev)
1848 {
1849         struct acpi_hardware_id *hwid;
1850
1851         list_for_each_entry(hwid, &adev->pnp.ids, list)
1852                 if (!strcmp("PNP0C0A", hwid->id))
1853                         return true;
1854
1855         return false;
1856 }
1857
1858 static bool is_ejectable_bay(struct acpi_device *adev)
1859 {
1860         acpi_handle handle = adev->handle;
1861
1862         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1863                 return true;
1864
1865         return acpi_bay_match(handle);
1866 }
1867
1868 /*
1869  * acpi_dock_match - see if an acpi object has a _DCK method
1870  */
1871 bool acpi_dock_match(acpi_handle handle)
1872 {
1873         return acpi_has_method(handle, "_DCK");
1874 }
1875
1876 const char *acpi_device_hid(struct acpi_device *device)
1877 {
1878         struct acpi_hardware_id *hid;
1879
1880         if (list_empty(&device->pnp.ids))
1881                 return dummy_hid;
1882
1883         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1884         return hid->id;
1885 }
1886 EXPORT_SYMBOL(acpi_device_hid);
1887
1888 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1889 {
1890         struct acpi_hardware_id *id;
1891
1892         id = kmalloc(sizeof(*id), GFP_KERNEL);
1893         if (!id)
1894                 return;
1895
1896         id->id = kstrdup(dev_id, GFP_KERNEL);
1897         if (!id->id) {
1898                 kfree(id);
1899                 return;
1900         }
1901
1902         list_add_tail(&id->list, &pnp->ids);
1903         pnp->type.hardware_id = 1;
1904 }
1905
1906 /*
1907  * Old IBM workstations have a DSDT bug wherein the SMBus object
1908  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1909  * prefix.  Work around this.
1910  */
1911 static bool acpi_ibm_smbus_match(acpi_handle handle)
1912 {
1913         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1914         struct acpi_buffer path = { sizeof(node_name), node_name };
1915
1916         if (!dmi_name_in_vendors("IBM"))
1917                 return false;
1918
1919         /* Look for SMBS object */
1920         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1921             strcmp("SMBS", path.pointer))
1922                 return false;
1923
1924         /* Does it have the necessary (but misnamed) methods? */
1925         if (acpi_has_method(handle, "SBI") &&
1926             acpi_has_method(handle, "SBR") &&
1927             acpi_has_method(handle, "SBW"))
1928                 return true;
1929
1930         return false;
1931 }
1932
1933 static bool acpi_object_is_system_bus(acpi_handle handle)
1934 {
1935         acpi_handle tmp;
1936
1937         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1938             tmp == handle)
1939                 return true;
1940         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1941             tmp == handle)
1942                 return true;
1943
1944         return false;
1945 }
1946
1947 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1948                                 int device_type)
1949 {
1950         acpi_status status;
1951         struct acpi_device_info *info;
1952         struct acpi_pnp_device_id_list *cid_list;
1953         int i;
1954
1955         switch (device_type) {
1956         case ACPI_BUS_TYPE_DEVICE:
1957                 if (handle == ACPI_ROOT_OBJECT) {
1958                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1959                         break;
1960                 }
1961
1962                 status = acpi_get_object_info(handle, &info);
1963                 if (ACPI_FAILURE(status)) {
1964                         pr_err(PREFIX "%s: Error reading device info\n",
1965                                         __func__);
1966                         return;
1967                 }
1968
1969                 if (info->valid & ACPI_VALID_HID) {
1970                         acpi_add_id(pnp, info->hardware_id.string);
1971                         pnp->type.platform_id = 1;
1972                 }
1973                 if (info->valid & ACPI_VALID_CID) {
1974                         cid_list = &info->compatible_id_list;
1975                         for (i = 0; i < cid_list->count; i++)
1976                                 acpi_add_id(pnp, cid_list->ids[i].string);
1977                 }
1978                 if (info->valid & ACPI_VALID_ADR) {
1979                         pnp->bus_address = info->address;
1980                         pnp->type.bus_address = 1;
1981                 }
1982                 if (info->valid & ACPI_VALID_UID)
1983                         pnp->unique_id = kstrdup(info->unique_id.string,
1984                                                         GFP_KERNEL);
1985
1986                 kfree(info);
1987
1988                 /*
1989                  * Some devices don't reliably have _HIDs & _CIDs, so add
1990                  * synthetic HIDs to make sure drivers can find them.
1991                  */
1992                 if (acpi_is_video_device(handle))
1993                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1994                 else if (acpi_bay_match(handle))
1995                         acpi_add_id(pnp, ACPI_BAY_HID);
1996                 else if (acpi_dock_match(handle))
1997                         acpi_add_id(pnp, ACPI_DOCK_HID);
1998                 else if (acpi_ibm_smbus_match(handle))
1999                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
2000                 else if (list_empty(&pnp->ids) &&
2001                          acpi_object_is_system_bus(handle)) {
2002                         /* \_SB, \_TZ, LNXSYBUS */
2003                         acpi_add_id(pnp, ACPI_BUS_HID);
2004                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
2005                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
2006                 }
2007
2008                 break;
2009         case ACPI_BUS_TYPE_POWER:
2010                 acpi_add_id(pnp, ACPI_POWER_HID);
2011                 break;
2012         case ACPI_BUS_TYPE_PROCESSOR:
2013                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
2014                 break;
2015         case ACPI_BUS_TYPE_THERMAL:
2016                 acpi_add_id(pnp, ACPI_THERMAL_HID);
2017                 break;
2018         case ACPI_BUS_TYPE_POWER_BUTTON:
2019                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
2020                 break;
2021         case ACPI_BUS_TYPE_SLEEP_BUTTON:
2022                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
2023                 break;
2024         }
2025 }
2026
2027 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
2028 {
2029         struct acpi_hardware_id *id, *tmp;
2030
2031         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
2032                 kfree(id->id);
2033                 kfree(id);
2034         }
2035         kfree(pnp->unique_id);
2036 }
2037
2038 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
2039                              int type, unsigned long long sta)
2040 {
2041         INIT_LIST_HEAD(&device->pnp.ids);
2042         device->device_type = type;
2043         device->handle = handle;
2044         device->parent = acpi_bus_get_parent(handle);
2045         device->fwnode.type = FWNODE_ACPI;
2046         acpi_set_device_status(device, sta);
2047         acpi_device_get_busid(device);
2048         acpi_set_pnp_ids(handle, &device->pnp, type);
2049         acpi_init_properties(device);
2050         acpi_bus_get_flags(device);
2051         device->flags.match_driver = false;
2052         device->flags.initialized = true;
2053         device->flags.visited = false;
2054         device_initialize(&device->dev);
2055         dev_set_uevent_suppress(&device->dev, true);
2056 }
2057
2058 void acpi_device_add_finalize(struct acpi_device *device)
2059 {
2060         dev_set_uevent_suppress(&device->dev, false);
2061         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
2062 }
2063
2064 static int acpi_add_single_object(struct acpi_device **child,
2065                                   acpi_handle handle, int type,
2066                                   unsigned long long sta)
2067 {
2068         int result;
2069         struct acpi_device *device;
2070         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
2071
2072         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
2073         if (!device) {
2074                 printk(KERN_ERR PREFIX "Memory allocation error\n");
2075                 return -ENOMEM;
2076         }
2077
2078         acpi_init_device_object(device, handle, type, sta);
2079         acpi_bus_get_power_flags(device);
2080         acpi_bus_get_wakeup_device_flags(device);
2081
2082         result = acpi_device_add(device, acpi_device_release);
2083         if (result) {
2084                 acpi_device_release(&device->dev);
2085                 return result;
2086         }
2087
2088         acpi_power_add_remove_device(device, true);
2089         acpi_device_add_finalize(device);
2090         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
2091         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
2092                 dev_name(&device->dev), (char *) buffer.pointer,
2093                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
2094         kfree(buffer.pointer);
2095         *child = device;
2096         return 0;
2097 }
2098
2099 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
2100                                     unsigned long long *sta)
2101 {
2102         acpi_status status;
2103         acpi_object_type acpi_type;
2104
2105         status = acpi_get_type(handle, &acpi_type);
2106         if (ACPI_FAILURE(status))
2107                 return -ENODEV;
2108
2109         switch (acpi_type) {
2110         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
2111         case ACPI_TYPE_DEVICE:
2112                 *type = ACPI_BUS_TYPE_DEVICE;
2113                 status = acpi_bus_get_status_handle(handle, sta);
2114                 if (ACPI_FAILURE(status))
2115                         return -ENODEV;
2116                 break;
2117         case ACPI_TYPE_PROCESSOR:
2118                 *type = ACPI_BUS_TYPE_PROCESSOR;
2119                 status = acpi_bus_get_status_handle(handle, sta);
2120                 if (ACPI_FAILURE(status))
2121                         return -ENODEV;
2122                 break;
2123         case ACPI_TYPE_THERMAL:
2124                 *type = ACPI_BUS_TYPE_THERMAL;
2125                 *sta = ACPI_STA_DEFAULT;
2126                 break;
2127         case ACPI_TYPE_POWER:
2128                 *type = ACPI_BUS_TYPE_POWER;
2129                 *sta = ACPI_STA_DEFAULT;
2130                 break;
2131         default:
2132                 return -ENODEV;
2133         }
2134
2135         return 0;
2136 }
2137
2138 bool acpi_device_is_present(struct acpi_device *adev)
2139 {
2140         if (adev->status.present || adev->status.functional)
2141                 return true;
2142
2143         adev->flags.initialized = false;
2144         return false;
2145 }
2146
2147 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
2148                                        char *idstr,
2149                                        const struct acpi_device_id **matchid)
2150 {
2151         const struct acpi_device_id *devid;
2152
2153         if (handler->match)
2154                 return handler->match(idstr, matchid);
2155
2156         for (devid = handler->ids; devid->id[0]; devid++)
2157                 if (!strcmp((char *)devid->id, idstr)) {
2158                         if (matchid)
2159                                 *matchid = devid;
2160
2161                         return true;
2162                 }
2163
2164         return false;
2165 }
2166
2167 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
2168                                         const struct acpi_device_id **matchid)
2169 {
2170         struct acpi_scan_handler *handler;
2171
2172         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
2173                 if (acpi_scan_handler_matching(handler, idstr, matchid))
2174                         return handler;
2175
2176         return NULL;
2177 }
2178
2179 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2180 {
2181         if (!!hotplug->enabled == !!val)
2182                 return;
2183
2184         mutex_lock(&acpi_scan_lock);
2185
2186         hotplug->enabled = val;
2187
2188         mutex_unlock(&acpi_scan_lock);
2189 }
2190
2191 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2192 {
2193         struct acpi_hardware_id *hwid;
2194
2195         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2196                 acpi_dock_add(adev);
2197                 return;
2198         }
2199         list_for_each_entry(hwid, &adev->pnp.ids, list) {
2200                 struct acpi_scan_handler *handler;
2201
2202                 handler = acpi_scan_match_handler(hwid->id, NULL);
2203                 if (handler) {
2204                         adev->flags.hotplug_notify = true;
2205                         break;
2206                 }
2207         }
2208 }
2209
2210 static void acpi_device_dep_initialize(struct acpi_device *adev)
2211 {
2212         struct acpi_dep_data *dep;
2213         struct acpi_handle_list dep_devices;
2214         acpi_status status;
2215         int i;
2216
2217         if (!acpi_has_method(adev->handle, "_DEP"))
2218                 return;
2219
2220         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
2221                                         &dep_devices);
2222         if (ACPI_FAILURE(status)) {
2223                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
2224                 return;
2225         }
2226
2227         for (i = 0; i < dep_devices.count; i++) {
2228                 struct acpi_device_info *info;
2229                 int skip;
2230
2231                 status = acpi_get_object_info(dep_devices.handles[i], &info);
2232                 if (ACPI_FAILURE(status)) {
2233                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
2234                         continue;
2235                 }
2236
2237                 /*
2238                  * Skip the dependency of Windows System Power
2239                  * Management Controller
2240                  */
2241                 skip = info->valid & ACPI_VALID_HID &&
2242                         !strcmp(info->hardware_id.string, "INT3396");
2243
2244                 kfree(info);
2245
2246                 if (skip)
2247                         continue;
2248
2249                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
2250                 if (!dep)
2251                         return;
2252
2253                 dep->master = dep_devices.handles[i];
2254                 dep->slave  = adev->handle;
2255                 adev->dep_unmet++;
2256
2257                 mutex_lock(&acpi_dep_list_lock);
2258                 list_add_tail(&dep->node , &acpi_dep_list);
2259                 mutex_unlock(&acpi_dep_list_lock);
2260         }
2261 }
2262
2263 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2264                                       void *not_used, void **return_value)
2265 {
2266         struct acpi_device *device = NULL;
2267         int type;
2268         unsigned long long sta;
2269         int result;
2270
2271         acpi_bus_get_device(handle, &device);
2272         if (device)
2273                 goto out;
2274
2275         result = acpi_bus_type_and_status(handle, &type, &sta);
2276         if (result)
2277                 return AE_OK;
2278
2279         if (type == ACPI_BUS_TYPE_POWER) {
2280                 acpi_add_power_resource(handle);
2281                 return AE_OK;
2282         }
2283
2284         acpi_add_single_object(&device, handle, type, sta);
2285         if (!device)
2286                 return AE_CTRL_DEPTH;
2287
2288         acpi_scan_init_hotplug(device);
2289         acpi_device_dep_initialize(device);
2290
2291  out:
2292         if (!*return_value)
2293                 *return_value = device;
2294
2295         return AE_OK;
2296 }
2297
2298 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
2299 {
2300         bool *is_spi_i2c_slave_p = data;
2301
2302         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
2303                 return 1;
2304
2305         /*
2306          * devices that are connected to UART still need to be enumerated to
2307          * platform bus
2308          */
2309         if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
2310                 *is_spi_i2c_slave_p = true;
2311
2312          /* no need to do more checking */
2313         return -1;
2314 }
2315
2316 static void acpi_default_enumeration(struct acpi_device *device)
2317 {
2318         struct list_head resource_list;
2319         bool is_spi_i2c_slave = false;
2320
2321         if (!device->pnp.type.platform_id || device->handler)
2322                 return;
2323
2324         /*
2325          * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2326          * respective parents.
2327          */
2328         INIT_LIST_HEAD(&resource_list);
2329         acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
2330                                &is_spi_i2c_slave);
2331         acpi_dev_free_resource_list(&resource_list);
2332         if (!is_spi_i2c_slave)
2333                 acpi_create_platform_device(device);
2334 }
2335
2336 static int acpi_scan_attach_handler(struct acpi_device *device)
2337 {
2338         struct acpi_hardware_id *hwid;
2339         int ret = 0;
2340
2341         list_for_each_entry(hwid, &device->pnp.ids, list) {
2342                 const struct acpi_device_id *devid;
2343                 struct acpi_scan_handler *handler;
2344
2345                 handler = acpi_scan_match_handler(hwid->id, &devid);
2346                 if (handler) {
2347                         if (!handler->attach) {
2348                                 device->pnp.type.platform_id = 0;
2349                                 continue;
2350                         }
2351                         device->handler = handler;
2352                         ret = handler->attach(device, devid);
2353                         if (ret > 0)
2354                                 break;
2355
2356                         device->handler = NULL;
2357                         if (ret < 0)
2358                                 break;
2359                 }
2360         }
2361         if (!ret)
2362                 acpi_default_enumeration(device);
2363
2364         return ret;
2365 }
2366
2367 static void acpi_bus_attach(struct acpi_device *device)
2368 {
2369         struct acpi_device *child;
2370         acpi_handle ejd;
2371         int ret;
2372
2373         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2374                 register_dock_dependent_device(device, ejd);
2375
2376         acpi_bus_get_status(device);
2377         /* Skip devices that are not present. */
2378         if (!acpi_device_is_present(device)) {
2379                 device->flags.visited = false;
2380                 device->flags.power_manageable = 0;
2381                 return;
2382         }
2383         if (device->handler)
2384                 goto ok;
2385
2386         if (!device->flags.initialized) {
2387                 device->flags.power_manageable =
2388                         device->power.states[ACPI_STATE_D0].flags.valid;
2389                 if (acpi_bus_init_power(device))
2390                         device->flags.power_manageable = 0;
2391
2392                 device->flags.initialized = true;
2393         }
2394         device->flags.visited = false;
2395         ret = acpi_scan_attach_handler(device);
2396         if (ret < 0)
2397                 return;
2398
2399         device->flags.match_driver = true;
2400         if (!ret) {
2401                 ret = device_attach(&device->dev);
2402                 if (ret < 0)
2403                         return;
2404         }
2405         device->flags.visited = true;
2406
2407  ok:
2408         list_for_each_entry(child, &device->children, node)
2409                 acpi_bus_attach(child);
2410
2411         if (device->handler && device->handler->hotplug.notify_online)
2412                 device->handler->hotplug.notify_online(device);
2413 }
2414
2415 void acpi_walk_dep_device_list(acpi_handle handle)
2416 {
2417         struct acpi_dep_data *dep, *tmp;
2418         struct acpi_device *adev;
2419
2420         mutex_lock(&acpi_dep_list_lock);
2421         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2422                 if (dep->master == handle) {
2423                         acpi_bus_get_device(dep->slave, &adev);
2424                         if (!adev)
2425                                 continue;
2426
2427                         adev->dep_unmet--;
2428                         if (!adev->dep_unmet)
2429                                 acpi_bus_attach(adev);
2430                         list_del(&dep->node);
2431                         kfree(dep);
2432                 }
2433         }
2434         mutex_unlock(&acpi_dep_list_lock);
2435 }
2436 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2437
2438 /**
2439  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2440  * @handle: Root of the namespace scope to scan.
2441  *
2442  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2443  * found devices.
2444  *
2445  * If no devices were found, -ENODEV is returned, but it does not mean that
2446  * there has been a real error.  There just have been no suitable ACPI objects
2447  * in the table trunk from which the kernel could create a device and add an
2448  * appropriate driver.
2449  *
2450  * Must be called under acpi_scan_lock.
2451  */
2452 int acpi_bus_scan(acpi_handle handle)
2453 {
2454         void *device = NULL;
2455
2456         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2457                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2458                                     acpi_bus_check_add, NULL, NULL, &device);
2459
2460         if (device) {
2461                 acpi_bus_attach(device);
2462                 return 0;
2463         }
2464         return -ENODEV;
2465 }
2466 EXPORT_SYMBOL(acpi_bus_scan);
2467
2468 /**
2469  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2470  * @adev: Root of the ACPI namespace scope to walk.
2471  *
2472  * Must be called under acpi_scan_lock.
2473  */
2474 void acpi_bus_trim(struct acpi_device *adev)
2475 {
2476         struct acpi_scan_handler *handler = adev->handler;
2477         struct acpi_device *child;
2478
2479         list_for_each_entry_reverse(child, &adev->children, node)
2480                 acpi_bus_trim(child);
2481
2482         adev->flags.match_driver = false;
2483         if (handler) {
2484                 if (handler->detach)
2485                         handler->detach(adev);
2486
2487                 adev->handler = NULL;
2488         } else {
2489                 device_release_driver(&adev->dev);
2490         }
2491         /*
2492          * Most likely, the device is going away, so put it into D3cold before
2493          * that.
2494          */
2495         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2496         adev->flags.initialized = false;
2497         adev->flags.visited = false;
2498 }
2499 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2500
2501 static int acpi_bus_scan_fixed(void)
2502 {
2503         int result = 0;
2504
2505         /*
2506          * Enumerate all fixed-feature devices.
2507          */
2508         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2509                 struct acpi_device *device = NULL;
2510
2511                 result = acpi_add_single_object(&device, NULL,
2512                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2513                                                 ACPI_STA_DEFAULT);
2514                 if (result)
2515                         return result;
2516
2517                 device->flags.match_driver = true;
2518                 result = device_attach(&device->dev);
2519                 if (result < 0)
2520                         return result;
2521
2522                 device_init_wakeup(&device->dev, true);
2523         }
2524
2525         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2526                 struct acpi_device *device = NULL;
2527
2528                 result = acpi_add_single_object(&device, NULL,
2529                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2530                                                 ACPI_STA_DEFAULT);
2531                 if (result)
2532                         return result;
2533
2534                 device->flags.match_driver = true;
2535                 result = device_attach(&device->dev);
2536         }
2537
2538         return result < 0 ? result : 0;
2539 }
2540
2541 int __init acpi_scan_init(void)
2542 {
2543         int result;
2544
2545         result = bus_register(&acpi_bus_type);
2546         if (result) {
2547                 /* We don't want to quit even if we failed to add suspend/resume */
2548                 printk(KERN_ERR PREFIX "Could not register bus type\n");
2549         }
2550
2551         acpi_pci_root_init();
2552         acpi_pci_link_init();
2553         acpi_processor_init();
2554         acpi_lpss_init();
2555         acpi_apd_init();
2556         acpi_cmos_rtc_init();
2557         acpi_container_init();
2558         acpi_memory_hotplug_init();
2559         acpi_pnp_init();
2560         acpi_int340x_thermal_init();
2561
2562         mutex_lock(&acpi_scan_lock);
2563         /*
2564          * Enumerate devices in the ACPI namespace.
2565          */
2566         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2567         if (result)
2568                 goto out;
2569
2570         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2571         if (result)
2572                 goto out;
2573
2574         /* Fixed feature devices do not exist on HW-reduced platform */
2575         if (!acpi_gbl_reduced_hardware) {
2576                 result = acpi_bus_scan_fixed();
2577                 if (result) {
2578                         acpi_detach_data(acpi_root->handle,
2579                                          acpi_scan_drop_device);
2580                         acpi_device_del(acpi_root);
2581                         put_device(&acpi_root->dev);
2582                         goto out;
2583                 }
2584         }
2585
2586         acpi_update_all_gpes();
2587
2588  out:
2589         mutex_unlock(&acpi_scan_lock);
2590         return result;
2591 }