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 /* Performs match against special "PRP0001" shoehorn ACPI ID */
 953 static bool acpi_of_driver_match_device(struct device *dev,
 954                                         const struct device_driver *drv)
 955 {
 956         const union acpi_object *of_compatible, *obj;
 957         struct acpi_device *adev;
 958         int i, nval;
 959
 960         adev = ACPI_COMPANION(dev);
 961         if (!adev)
 962                 return false;
 963
 964         of_compatible = adev->data.of_compatible;
 965         if (!drv->of_match_table || !of_compatible)
 966                 return false;
 967
 968         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 969                 nval = of_compatible->package.count;
 970                 obj = of_compatible->package.elements;
 971         } else { /* Must be ACPI_TYPE_STRING. */
 972                 nval = 1;
 973                 obj = of_compatible;
 974         }
 975         /* Now we can look for the driver DT compatible strings */
 976         for (i = 0; i < nval; i++, obj++) {
 977                 const struct of_device_id *id;
 978
 979                 for (id = drv->of_match_table; id->compatible[0]; id++)
 980                         if (!strcasecmp(obj->string.pointer, id->compatible))
 981                                 return true;
 982         }
 983
 984         return false;
 985 }
 986
 987 bool acpi_driver_match_device(struct device *dev,
 988                               const struct device_driver *drv)
 989 {
 990         if (!drv->acpi_match_table)
 991                 return acpi_of_driver_match_device(dev, drv);
 992
 993         return !!acpi_match_device(drv->acpi_match_table, dev);
 994 }
 995 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 996
 997 static void acpi_free_power_resources_lists(struct acpi_device *device)
 998 {
 999         int i;
1000
1001         if (device->wakeup.flags.valid)
1002                 acpi_power_resources_list_free(&device->wakeup.resources);
1003
1004         if (!device->flags.power_manageable)
1005                 return;
1006
1007         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1008                 struct acpi_device_power_state *ps = &device->power.states[i];
1009                 acpi_power_resources_list_free(&ps->resources);
1010         }
1011 }
1012
1013 static void acpi_device_release(struct device *dev)
1014 {
1015         struct acpi_device *acpi_dev = to_acpi_device(dev);
1016
1017         acpi_free_properties(acpi_dev);
1018         acpi_free_pnp_ids(&acpi_dev->pnp);
1019         acpi_free_power_resources_lists(acpi_dev);
1020         kfree(acpi_dev);
1021 }
1022
1023 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
1024 {
1025         struct acpi_device *acpi_dev = to_acpi_device(dev);
1026         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1027
1028         return acpi_dev->flags.match_driver
1029                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1030 }
1031
1032 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
1033 {
1034         struct acpi_device *acpi_dev = to_acpi_device(dev);
1035         int len;
1036
1037         if (list_empty(&acpi_dev->pnp.ids))
1038                 return 0;
1039
1040         if (add_uevent_var(env, "MODALIAS="))
1041                 return -ENOMEM;
1042         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
1043                               sizeof(env->buf) - env->buflen);
1044         if (len <= 0)
1045                 return len;
1046         env->buflen += len;
1047         return 0;
1048 }
1049
1050 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
1051 {
1052         struct acpi_device *device = data;
1053
1054         device->driver->ops.notify(device, event);
1055 }
1056
1057 static void acpi_device_notify_fixed(void *data)
1058 {
1059         struct acpi_device *device = data;
1060
1061         /* Fixed hardware devices have no handles */
1062         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
1063 }
1064
1065 static acpi_status acpi_device_fixed_event(void *data)
1066 {
1067         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
1068         return AE_OK;
1069 }
1070
1071 static int acpi_device_install_notify_handler(struct acpi_device *device)
1072 {
1073         acpi_status status;
1074
1075         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
1076                 status =
1077                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
1078                                                      acpi_device_fixed_event,
1079                                                      device);
1080         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
1081                 status =
1082                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
1083                                                      acpi_device_fixed_event,
1084                                                      device);
1085         else
1086                 status = acpi_install_notify_handler(device->handle,
1087                                                      ACPI_DEVICE_NOTIFY,
1088                                                      acpi_device_notify,
1089                                                      device);
1090
1091         if (ACPI_FAILURE(status))
1092                 return -EINVAL;
1093         return 0;
1094 }
1095
1096 static void acpi_device_remove_notify_handler(struct acpi_device *device)
1097 {
1098         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
1099                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
1100                                                 acpi_device_fixed_event);
1101         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
1102                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
1103                                                 acpi_device_fixed_event);
1104         else
1105                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1106                                            acpi_device_notify);
1107 }
1108
1109 static int acpi_device_probe(struct device *dev)
1110 {
1111         struct acpi_device *acpi_dev = to_acpi_device(dev);
1112         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1113         int ret;
1114
1115         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1116                 return -EINVAL;
1117
1118         if (!acpi_drv->ops.add)
1119                 return -ENOSYS;
1120
1121         ret = acpi_drv->ops.add(acpi_dev);
1122         if (ret)
1123                 return ret;
1124
1125         acpi_dev->driver = acpi_drv;
1126         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1127                           "Driver [%s] successfully bound to device [%s]\n",
1128                           acpi_drv->name, acpi_dev->pnp.bus_id));
1129
1130         if (acpi_drv->ops.notify) {
1131                 ret = acpi_device_install_notify_handler(acpi_dev);
1132                 if (ret) {
1133                         if (acpi_drv->ops.remove)
1134                                 acpi_drv->ops.remove(acpi_dev);
1135
1136                         acpi_dev->driver = NULL;
1137                         acpi_dev->driver_data = NULL;
1138                         return ret;
1139                 }
1140         }
1141
1142         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1143                           acpi_drv->name, acpi_dev->pnp.bus_id));
1144         get_device(dev);
1145         return 0;
1146 }
1147
1148 static int acpi_device_remove(struct device * dev)
1149 {
1150         struct acpi_device *acpi_dev = to_acpi_device(dev);
1151         struct acpi_driver *acpi_drv = acpi_dev->driver;
1152
1153         if (acpi_drv) {
1154                 if (acpi_drv->ops.notify)
1155                         acpi_device_remove_notify_handler(acpi_dev);
1156                 if (acpi_drv->ops.remove)
1157                         acpi_drv->ops.remove(acpi_dev);
1158         }
1159         acpi_dev->driver = NULL;
1160         acpi_dev->driver_data = NULL;
1161
1162         put_device(dev);
1163         return 0;
1164 }
1165
1166 struct bus_type acpi_bus_type = {
1167         .name           = "acpi",
1168         .match          = acpi_bus_match,
1169         .probe          = acpi_device_probe,
1170         .remove         = acpi_device_remove,
1171         .uevent         = acpi_device_uevent,
1172 };
1173
1174 static void acpi_device_del(struct acpi_device *device)
1175 {
1176         mutex_lock(&acpi_device_lock);
1177         if (device->parent)
1178                 list_del(&device->node);
1179
1180         list_del(&device->wakeup_list);
1181         mutex_unlock(&acpi_device_lock);
1182
1183         acpi_power_add_remove_device(device, false);
1184         acpi_device_remove_files(device);
1185         if (device->remove)
1186                 device->remove(device);
1187
1188         device_del(&device->dev);
1189 }
1190
1191 static LIST_HEAD(acpi_device_del_list);
1192 static DEFINE_MUTEX(acpi_device_del_lock);
1193
1194 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1195 {
1196         for (;;) {
1197                 struct acpi_device *adev;
1198
1199                 mutex_lock(&acpi_device_del_lock);
1200
1201                 if (list_empty(&acpi_device_del_list)) {
1202                         mutex_unlock(&acpi_device_del_lock);
1203                         break;
1204                 }
1205                 adev = list_first_entry(&acpi_device_del_list,
1206                                         struct acpi_device, del_list);
1207                 list_del(&adev->del_list);
1208
1209                 mutex_unlock(&acpi_device_del_lock);
1210
1211                 acpi_device_del(adev);
1212                 /*
1213                  * Drop references to all power resources that might have been
1214                  * used by the device.
1215                  */
1216                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1217                 put_device(&adev->dev);
1218         }
1219 }
1220
1221 /**
1222  * acpi_scan_drop_device - Drop an ACPI device object.
1223  * @handle: Handle of an ACPI namespace node, not used.
1224  * @context: Address of the ACPI device object to drop.
1225  *
1226  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1227  * namespace node the device object pointed to by @context is attached to.
1228  *
1229  * The unregistration is carried out asynchronously to avoid running
1230  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1231  * ensure the correct ordering (the device objects must be unregistered in the
1232  * same order in which the corresponding namespace nodes are deleted).
1233  */
1234 static void acpi_scan_drop_device(acpi_handle handle, void *context)
1235 {
1236         static DECLARE_WORK(work, acpi_device_del_work_fn);
1237         struct acpi_device *adev = context;
1238
1239         mutex_lock(&acpi_device_del_lock);
1240
1241         /*
1242          * Use the ACPI hotplug workqueue which is ordered, so this work item
1243          * won't run after any hotplug work items submitted subsequently.  That
1244          * prevents attempts to register device objects identical to those being
1245          * deleted from happening concurrently (such attempts result from
1246          * hotplug events handled via the ACPI hotplug workqueue).  It also will
1247          * run after all of the work items submitted previosuly, which helps
1248          * those work items to ensure that they are not accessing stale device
1249          * objects.
1250          */
1251         if (list_empty(&acpi_device_del_list))
1252                 acpi_queue_hotplug_work(&work);
1253
1254         list_add_tail(&adev->del_list, &acpi_device_del_list);
1255         /* Make acpi_ns_validate_handle() return NULL for this handle. */
1256         adev->handle = INVALID_ACPI_HANDLE;
1257
1258         mutex_unlock(&acpi_device_del_lock);
1259 }
1260
1261 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
1262                                 void (*callback)(void *))
1263 {
1264         acpi_status status;
1265
1266         if (!device)
1267                 return -EINVAL;
1268
1269         status = acpi_get_data_full(handle, acpi_scan_drop_device,
1270                                     (void **)device, callback);
1271         if (ACPI_FAILURE(status) || !*device) {
1272                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1273                                   handle));
1274                 return -ENODEV;
1275         }
1276         return 0;
1277 }
1278
1279 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1280 {
1281         return acpi_get_device_data(handle, device, NULL);
1282 }
1283 EXPORT_SYMBOL(acpi_bus_get_device);
1284
1285 static void get_acpi_device(void *dev)
1286 {
1287         if (dev)
1288                 get_device(&((struct acpi_device *)dev)->dev);
1289 }
1290
1291 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
1292 {
1293         struct acpi_device *adev = NULL;
1294
1295         acpi_get_device_data(handle, &adev, get_acpi_device);
1296         return adev;
1297 }
1298
1299 void acpi_bus_put_acpi_device(struct acpi_device *adev)
1300 {
1301         put_device(&adev->dev);
1302 }
1303
1304 int acpi_device_add(struct acpi_device *device,
1305                     void (*release)(struct device *))
1306 {
1307         int result;
1308         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1309         int found = 0;
1310
1311         if (device->handle) {
1312                 acpi_status status;
1313
1314                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1315                                           device);
1316                 if (ACPI_FAILURE(status)) {
1317                         acpi_handle_err(device->handle,
1318                                         "Unable to attach device data\n");
1319                         return -ENODEV;
1320                 }
1321         }
1322
1323         /*
1324          * Linkage
1325          * -------
1326          * Link this device to its parent and siblings.
1327          */
1328         INIT_LIST_HEAD(&device->children);
1329         INIT_LIST_HEAD(&device->node);
1330         INIT_LIST_HEAD(&device->wakeup_list);
1331         INIT_LIST_HEAD(&device->physical_node_list);
1332         INIT_LIST_HEAD(&device->del_list);
1333         mutex_init(&device->physical_node_lock);
1334
1335         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1336         if (!new_bus_id) {
1337                 pr_err(PREFIX "Memory allocation error\n");
1338                 result = -ENOMEM;
1339                 goto err_detach;
1340         }
1341
1342         mutex_lock(&acpi_device_lock);
1343         /*
1344          * Find suitable bus_id and instance number in acpi_bus_id_list
1345          * If failed, create one and link it into acpi_bus_id_list
1346          */
1347         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1348                 if (!strcmp(acpi_device_bus_id->bus_id,
1349                             acpi_device_hid(device))) {
1350                         acpi_device_bus_id->instance_no++;
1351                         found = 1;
1352                         kfree(new_bus_id);
1353                         break;
1354                 }
1355         }
1356         if (!found) {
1357                 acpi_device_bus_id = new_bus_id;
1358                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1359                 acpi_device_bus_id->instance_no = 0;
1360                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1361         }
1362         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1363
1364         if (device->parent)
1365                 list_add_tail(&device->node, &device->parent->children);
1366
1367         if (device->wakeup.flags.valid)
1368                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1369         mutex_unlock(&acpi_device_lock);
1370
1371         if (device->parent)
1372                 device->dev.parent = &device->parent->dev;
1373         device->dev.bus = &acpi_bus_type;
1374         device->dev.release = release;
1375         result = device_add(&device->dev);
1376         if (result) {
1377                 dev_err(&device->dev, "Error registering device\n");
1378                 goto err;
1379         }
1380
1381         result = acpi_device_setup_files(device);
1382         if (result)
1383                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1384                        dev_name(&device->dev));
1385
1386         return 0;
1387
1388  err:
1389         mutex_lock(&acpi_device_lock);
1390         if (device->parent)
1391                 list_del(&device->node);
1392         list_del(&device->wakeup_list);
1393         mutex_unlock(&acpi_device_lock);
1394
1395  err_detach:
1396         acpi_detach_data(device->handle, acpi_scan_drop_device);
1397         return result;
1398 }
1399
1400 struct acpi_device *acpi_get_next_child(struct device *dev,
1401                                         struct acpi_device *child)
1402 {
1403         struct acpi_device *adev = ACPI_COMPANION(dev);
1404         struct list_head *head, *next;
1405
1406         if (!adev)
1407                 return NULL;
1408
1409         head = &adev->children;
1410         if (list_empty(head))
1411                 return NULL;
1412
1413         if (!child)
1414                 return list_first_entry(head, struct acpi_device, node);
1415
1416         next = child->node.next;
1417         return next == head ? NULL : list_entry(next, struct acpi_device, node);
1418 }
1419
1420 /* --------------------------------------------------------------------------
1421                                  Driver Management
1422    -------------------------------------------------------------------------- */
1423 /**
1424  * acpi_bus_register_driver - register a driver with the ACPI bus
1425  * @driver: driver being registered
1426  *
1427  * Registers a driver with the ACPI bus.  Searches the namespace for all
1428  * devices that match the driver's criteria and binds.  Returns zero for
1429  * success or a negative error status for failure.
1430  */
1431 int acpi_bus_register_driver(struct acpi_driver *driver)
1432 {
1433         int ret;
1434
1435         if (acpi_disabled)
1436                 return -ENODEV;
1437         driver->drv.name = driver->name;
1438         driver->drv.bus = &acpi_bus_type;
1439         driver->drv.owner = driver->owner;
1440
1441         ret = driver_register(&driver->drv);
1442         return ret;
1443 }
1444
1445 EXPORT_SYMBOL(acpi_bus_register_driver);
1446
1447 /**
1448  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1449  * @driver: driver to unregister
1450  *
1451  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
1452  * devices that match the driver's criteria and unbinds.
1453  */
1454 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1455 {
1456         driver_unregister(&driver->drv);
1457 }
1458
1459 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1460
1461 /* --------------------------------------------------------------------------
1462                                  Device Enumeration
1463    -------------------------------------------------------------------------- */
1464 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1465 {
1466         struct acpi_device *device = NULL;
1467         acpi_status status;
1468
1469         /*
1470          * Fixed hardware devices do not appear in the namespace and do not
1471          * have handles, but we fabricate acpi_devices for them, so we have
1472          * to deal with them specially.
1473          */
1474         if (!handle)
1475                 return acpi_root;
1476
1477         do {
1478                 status = acpi_get_parent(handle, &handle);
1479                 if (ACPI_FAILURE(status))
1480                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
1481         } while (acpi_bus_get_device(handle, &device));
1482         return device;
1483 }
1484
1485 acpi_status
1486 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1487 {
1488         acpi_status status;
1489         acpi_handle tmp;
1490         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1491         union acpi_object *obj;
1492
1493         status = acpi_get_handle(handle, "_EJD", &tmp);
1494         if (ACPI_FAILURE(status))
1495                 return status;
1496
1497         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1498         if (ACPI_SUCCESS(status)) {
1499                 obj = buffer.pointer;
1500                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1501                                          ejd);
1502                 kfree(buffer.pointer);
1503         }
1504         return status;
1505 }
1506 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1507
1508 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1509                                         struct acpi_device_wakeup *wakeup)
1510 {
1511         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1512         union acpi_object *package = NULL;
1513         union acpi_object *element = NULL;
1514         acpi_status status;
1515         int err = -ENODATA;
1516
1517         if (!wakeup)
1518                 return -EINVAL;
1519
1520         INIT_LIST_HEAD(&wakeup->resources);
1521
1522         /* _PRW */
1523         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1524         if (ACPI_FAILURE(status)) {
1525                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1526                 return err;
1527         }
1528
1529         package = (union acpi_object *)buffer.pointer;
1530
1531         if (!package || package->package.count < 2)
1532                 goto out;
1533
1534         element = &(package->package.elements[0]);
1535         if (!element)
1536                 goto out;
1537
1538         if (element->type == ACPI_TYPE_PACKAGE) {
1539                 if ((element->package.count < 2) ||
1540                     (element->package.elements[0].type !=
1541                      ACPI_TYPE_LOCAL_REFERENCE)
1542                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1543                         goto out;
1544
1545                 wakeup->gpe_device =
1546                     element->package.elements[0].reference.handle;
1547                 wakeup->gpe_number =
1548                     (u32) element->package.elements[1].integer.value;
1549         } else if (element->type == ACPI_TYPE_INTEGER) {
1550                 wakeup->gpe_device = NULL;
1551                 wakeup->gpe_number = element->integer.value;
1552         } else {
1553                 goto out;
1554         }
1555
1556         element = &(package->package.elements[1]);
1557         if (element->type != ACPI_TYPE_INTEGER)
1558                 goto out;
1559
1560         wakeup->sleep_state = element->integer.value;
1561
1562         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1563         if (err)
1564                 goto out;
1565
1566         if (!list_empty(&wakeup->resources)) {
1567                 int sleep_state;
1568
1569                 err = acpi_power_wakeup_list_init(&wakeup->resources,
1570                                                   &sleep_state);
1571                 if (err) {
1572                         acpi_handle_warn(handle, "Retrieving current states "
1573                                          "of wakeup power resources failed\n");
1574                         acpi_power_resources_list_free(&wakeup->resources);
1575                         goto out;
1576                 }
1577                 if (sleep_state < wakeup->sleep_state) {
1578                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
1579                                          "(S%d) by S%d from power resources\n",
1580                                          (int)wakeup->sleep_state, sleep_state);
1581                         wakeup->sleep_state = sleep_state;
1582                 }
1583         }
1584
1585  out:
1586         kfree(buffer.pointer);
1587         return err;
1588 }
1589
1590 static void acpi_wakeup_gpe_init(struct acpi_device *device)
1591 {
1592         struct acpi_device_id button_device_ids[] = {
1593                 {"PNP0C0C", 0},
1594                 {"PNP0C0D", 0},
1595                 {"PNP0C0E", 0},
1596                 {"", 0},
1597         };
1598         struct acpi_device_wakeup *wakeup = &device->wakeup;
1599         acpi_status status;
1600         acpi_event_status event_status;
1601
1602         wakeup->flags.notifier_present = 0;
1603
1604         /* Power button, Lid switch always enable wakeup */
1605         if (!acpi_match_device_ids(device, button_device_ids)) {
1606                 wakeup->flags.run_wake = 1;
1607                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1608                         /* Do not use Lid/sleep button for S5 wakeup */
1609                         if (wakeup->sleep_state == ACPI_STATE_S5)
1610                                 wakeup->sleep_state = ACPI_STATE_S4;
1611                 }
1612                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
1613                 device_set_wakeup_capable(&device->dev, true);
1614                 return;
1615         }
1616
1617         acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
1618                                 wakeup->gpe_number);
1619         status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
1620                                      &event_status);
1621         if (ACPI_FAILURE(status))
1622                 return;
1623
1624         wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
1625 }
1626
1627 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1628 {
1629         int err;
1630
1631         /* Presence of _PRW indicates wake capable */
1632         if (!acpi_has_method(device->handle, "_PRW"))
1633                 return;
1634
1635         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1636                                                            &device->wakeup);
1637         if (err) {
1638                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1639                 return;
1640         }
1641
1642         device->wakeup.flags.valid = 1;
1643         device->wakeup.prepare_count = 0;
1644         acpi_wakeup_gpe_init(device);
1645         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1646          * system for the ACPI device with the _PRW object.
1647          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1648          * So it is necessary to call _DSW object first. Only when it is not
1649          * present will the _PSW object used.
1650          */
1651         err = acpi_device_sleep_wake(device, 0, 0, 0);
1652         if (err)
1653                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1654                                 "error in _DSW or _PSW evaluation\n"));
1655 }
1656
1657 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1658 {
1659         struct acpi_device_power_state *ps = &device->power.states[state];
1660         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1661         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1662         acpi_status status;
1663
1664         INIT_LIST_HEAD(&ps->resources);
1665
1666         /* Evaluate "_PRx" to get referenced power resources */
1667         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1668         if (ACPI_SUCCESS(status)) {
1669                 union acpi_object *package = buffer.pointer;
1670
1671                 if (buffer.length && package
1672                     && package->type == ACPI_TYPE_PACKAGE
1673                     && package->package.count) {
1674                         int err = acpi_extract_power_resources(package, 0,
1675                                                                &ps->resources);
1676                         if (!err)
1677                                 device->power.flags.power_resources = 1;
1678                 }
1679                 ACPI_FREE(buffer.pointer);
1680         }
1681
1682         /* Evaluate "_PSx" to see if we can do explicit sets */
1683         pathname[2] = 'S';
1684         if (acpi_has_method(device->handle, pathname))
1685                 ps->flags.explicit_set = 1;
1686
1687         /*
1688          * State is valid if there are means to put the device into it.
1689          * D3hot is only valid if _PR3 present.
1690          */
1691         if (!list_empty(&ps->resources)
1692             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1693                 ps->flags.valid = 1;
1694                 ps->flags.os_accessible = 1;
1695         }
1696
1697         ps->power = -1;         /* Unknown - driver assigned */
1698         ps->latency = -1;       /* Unknown - driver assigned */
1699 }
1700
1701 static void acpi_bus_get_power_flags(struct acpi_device *device)
1702 {
1703         u32 i;
1704
1705         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1706         if (!acpi_has_method(device->handle, "_PS0") &&
1707             !acpi_has_method(device->handle, "_PR0"))
1708                 return;
1709
1710         device->flags.power_manageable = 1;
1711
1712         /*
1713          * Power Management Flags
1714          */
1715         if (acpi_has_method(device->handle, "_PSC"))
1716                 device->power.flags.explicit_get = 1;
1717
1718         if (acpi_has_method(device->handle, "_IRC"))
1719                 device->power.flags.inrush_current = 1;
1720
1721         if (acpi_has_method(device->handle, "_DSW"))
1722                 device->power.flags.dsw_present = 1;
1723
1724         /*
1725          * Enumerate supported power management states
1726          */
1727         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1728                 acpi_bus_init_power_state(device, i);
1729
1730         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1731
1732         /* Set defaults for D0 and D3 states (always valid) */
1733         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1734         device->power.states[ACPI_STATE_D0].power = 100;
1735         device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1736         device->power.states[ACPI_STATE_D3_COLD].power = 0;
1737
1738         /* Set D3cold's explicit_set flag if _PS3 exists. */
1739         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1740                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1741
1742         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1743         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1744                         device->power.flags.power_resources)
1745                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1746
1747         if (acpi_bus_init_power(device)) {
1748                 acpi_free_power_resources_lists(device);
1749                 device->flags.power_manageable = 0;
1750         }
1751 }
1752
1753 static void acpi_bus_get_flags(struct acpi_device *device)
1754 {
1755         /* Presence of _STA indicates 'dynamic_status' */
1756         if (acpi_has_method(device->handle, "_STA"))
1757                 device->flags.dynamic_status = 1;
1758
1759         /* Presence of _RMV indicates 'removable' */
1760         if (acpi_has_method(device->handle, "_RMV"))
1761                 device->flags.removable = 1;
1762
1763         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1764         if (acpi_has_method(device->handle, "_EJD") ||
1765             acpi_has_method(device->handle, "_EJ0"))
1766                 device->flags.ejectable = 1;
1767 }
1768
1769 static void acpi_device_get_busid(struct acpi_device *device)
1770 {
1771         char bus_id[5] = { '?', 0 };
1772         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1773         int i = 0;
1774
1775         /*
1776          * Bus ID
1777          * ------
1778          * The device's Bus ID is simply the object name.
1779          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1780          */
1781         if (ACPI_IS_ROOT_DEVICE(device)) {
1782                 strcpy(device->pnp.bus_id, "ACPI");
1783                 return;
1784         }
1785
1786         switch (device->device_type) {
1787         case ACPI_BUS_TYPE_POWER_BUTTON:
1788                 strcpy(device->pnp.bus_id, "PWRF");
1789                 break;
1790         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1791                 strcpy(device->pnp.bus_id, "SLPF");
1792                 break;
1793         default:
1794                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1795                 /* Clean up trailing underscores (if any) */
1796                 for (i = 3; i > 1; i--) {
1797                         if (bus_id[i] == '_')
1798                                 bus_id[i] = '\0';
1799                         else
1800                                 break;
1801                 }
1802                 strcpy(device->pnp.bus_id, bus_id);
1803                 break;
1804         }
1805 }
1806
1807 /*
1808  * acpi_ata_match - see if an acpi object is an ATA device
1809  *
1810  * If an acpi object has one of the ACPI ATA methods defined,
1811  * then we can safely call it an ATA device.
1812  */
1813 bool acpi_ata_match(acpi_handle handle)
1814 {
1815         return acpi_has_method(handle, "_GTF") ||
1816                acpi_has_method(handle, "_GTM") ||
1817                acpi_has_method(handle, "_STM") ||
1818                acpi_has_method(handle, "_SDD");
1819 }
1820
1821 /*
1822  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1823  *
1824  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1825  * then we can safely call it an ejectable drive bay
1826  */
1827 bool acpi_bay_match(acpi_handle handle)
1828 {
1829         acpi_handle phandle;
1830
1831         if (!acpi_has_method(handle, "_EJ0"))
1832                 return false;
1833         if (acpi_ata_match(handle))
1834                 return true;
1835         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1836                 return false;
1837
1838         return acpi_ata_match(phandle);
1839 }
1840
1841 bool acpi_device_is_battery(struct acpi_device *adev)
1842 {
1843         struct acpi_hardware_id *hwid;
1844
1845         list_for_each_entry(hwid, &adev->pnp.ids, list)
1846                 if (!strcmp("PNP0C0A", hwid->id))
1847                         return true;
1848
1849         return false;
1850 }
1851
1852 static bool is_ejectable_bay(struct acpi_device *adev)
1853 {
1854         acpi_handle handle = adev->handle;
1855
1856         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1857                 return true;
1858
1859         return acpi_bay_match(handle);
1860 }
1861
1862 /*
1863  * acpi_dock_match - see if an acpi object has a _DCK method
1864  */
1865 bool acpi_dock_match(acpi_handle handle)
1866 {
1867         return acpi_has_method(handle, "_DCK");
1868 }
1869
1870 const char *acpi_device_hid(struct acpi_device *device)
1871 {
1872         struct acpi_hardware_id *hid;
1873
1874         if (list_empty(&device->pnp.ids))
1875                 return dummy_hid;
1876
1877         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1878         return hid->id;
1879 }
1880 EXPORT_SYMBOL(acpi_device_hid);
1881
1882 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1883 {
1884         struct acpi_hardware_id *id;
1885
1886         id = kmalloc(sizeof(*id), GFP_KERNEL);
1887         if (!id)
1888                 return;
1889
1890         id->id = kstrdup(dev_id, GFP_KERNEL);
1891         if (!id->id) {
1892                 kfree(id);
1893                 return;
1894         }
1895
1896         list_add_tail(&id->list, &pnp->ids);
1897         pnp->type.hardware_id = 1;
1898 }
1899
1900 /*
1901  * Old IBM workstations have a DSDT bug wherein the SMBus object
1902  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1903  * prefix.  Work around this.
1904  */
1905 static bool acpi_ibm_smbus_match(acpi_handle handle)
1906 {
1907         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1908         struct acpi_buffer path = { sizeof(node_name), node_name };
1909
1910         if (!dmi_name_in_vendors("IBM"))
1911                 return false;
1912
1913         /* Look for SMBS object */
1914         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1915             strcmp("SMBS", path.pointer))
1916                 return false;
1917
1918         /* Does it have the necessary (but misnamed) methods? */
1919         if (acpi_has_method(handle, "SBI") &&
1920             acpi_has_method(handle, "SBR") &&
1921             acpi_has_method(handle, "SBW"))
1922                 return true;
1923
1924         return false;
1925 }
1926
1927 static bool acpi_object_is_system_bus(acpi_handle handle)
1928 {
1929         acpi_handle tmp;
1930
1931         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1932             tmp == handle)
1933                 return true;
1934         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1935             tmp == handle)
1936                 return true;
1937
1938         return false;
1939 }
1940
1941 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1942                                 int device_type)
1943 {
1944         acpi_status status;
1945         struct acpi_device_info *info;
1946         struct acpi_pnp_device_id_list *cid_list;
1947         int i;
1948
1949         switch (device_type) {
1950         case ACPI_BUS_TYPE_DEVICE:
1951                 if (handle == ACPI_ROOT_OBJECT) {
1952                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1953                         break;
1954                 }
1955
1956                 status = acpi_get_object_info(handle, &info);
1957                 if (ACPI_FAILURE(status)) {
1958                         pr_err(PREFIX "%s: Error reading device info\n",
1959                                         __func__);
1960                         return;
1961                 }
1962
1963                 if (info->valid & ACPI_VALID_HID) {
1964                         acpi_add_id(pnp, info->hardware_id.string);
1965                         pnp->type.platform_id = 1;
1966                 }
1967                 if (info->valid & ACPI_VALID_CID) {
1968                         cid_list = &info->compatible_id_list;
1969                         for (i = 0; i < cid_list->count; i++)
1970                                 acpi_add_id(pnp, cid_list->ids[i].string);
1971                 }
1972                 if (info->valid & ACPI_VALID_ADR) {
1973                         pnp->bus_address = info->address;
1974                         pnp->type.bus_address = 1;
1975                 }
1976                 if (info->valid & ACPI_VALID_UID)
1977                         pnp->unique_id = kstrdup(info->unique_id.string,
1978                                                         GFP_KERNEL);
1979
1980                 kfree(info);
1981
1982                 /*
1983                  * Some devices don't reliably have _HIDs & _CIDs, so add
1984                  * synthetic HIDs to make sure drivers can find them.
1985                  */
1986                 if (acpi_is_video_device(handle))
1987                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1988                 else if (acpi_bay_match(handle))
1989                         acpi_add_id(pnp, ACPI_BAY_HID);
1990                 else if (acpi_dock_match(handle))
1991                         acpi_add_id(pnp, ACPI_DOCK_HID);
1992                 else if (acpi_ibm_smbus_match(handle))
1993                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1994                 else if (list_empty(&pnp->ids) &&
1995                          acpi_object_is_system_bus(handle)) {
1996                         /* \_SB, \_TZ, LNXSYBUS */
1997                         acpi_add_id(pnp, ACPI_BUS_HID);
1998                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1999                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
2000                 }
2001
2002                 break;
2003         case ACPI_BUS_TYPE_POWER:
2004                 acpi_add_id(pnp, ACPI_POWER_HID);
2005                 break;
2006         case ACPI_BUS_TYPE_PROCESSOR:
2007                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
2008                 break;
2009         case ACPI_BUS_TYPE_THERMAL:
2010                 acpi_add_id(pnp, ACPI_THERMAL_HID);
2011                 break;
2012         case ACPI_BUS_TYPE_POWER_BUTTON:
2013                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
2014                 break;
2015         case ACPI_BUS_TYPE_SLEEP_BUTTON:
2016                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
2017                 break;
2018         }
2019 }
2020
2021 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
2022 {
2023         struct acpi_hardware_id *id, *tmp;
2024
2025         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
2026                 kfree(id->id);
2027                 kfree(id);
2028         }
2029         kfree(pnp->unique_id);
2030 }
2031
2032 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
2033                              int type, unsigned long long sta)
2034 {
2035         INIT_LIST_HEAD(&device->pnp.ids);
2036         device->device_type = type;
2037         device->handle = handle;
2038         device->parent = acpi_bus_get_parent(handle);
2039         device->fwnode.type = FWNODE_ACPI;
2040         acpi_set_device_status(device, sta);
2041         acpi_device_get_busid(device);
2042         acpi_set_pnp_ids(handle, &device->pnp, type);
2043         acpi_init_properties(device);
2044         acpi_bus_get_flags(device);
2045         device->flags.match_driver = false;
2046         device->flags.initialized = true;
2047         device->flags.visited = false;
2048         device_initialize(&device->dev);
2049         dev_set_uevent_suppress(&device->dev, true);
2050 }
2051
2052 void acpi_device_add_finalize(struct acpi_device *device)
2053 {
2054         dev_set_uevent_suppress(&device->dev, false);
2055         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
2056 }
2057
2058 static int acpi_add_single_object(struct acpi_device **child,
2059                                   acpi_handle handle, int type,
2060                                   unsigned long long sta)
2061 {
2062         int result;
2063         struct acpi_device *device;
2064         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
2065
2066         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
2067         if (!device) {
2068                 printk(KERN_ERR PREFIX "Memory allocation error\n");
2069                 return -ENOMEM;
2070         }
2071
2072         acpi_init_device_object(device, handle, type, sta);
2073         acpi_bus_get_power_flags(device);
2074         acpi_bus_get_wakeup_device_flags(device);
2075
2076         result = acpi_device_add(device, acpi_device_release);
2077         if (result) {
2078                 acpi_device_release(&device->dev);
2079                 return result;
2080         }
2081
2082         acpi_power_add_remove_device(device, true);
2083         acpi_device_add_finalize(device);
2084         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
2085         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
2086                 dev_name(&device->dev), (char *) buffer.pointer,
2087                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
2088         kfree(buffer.pointer);
2089         *child = device;
2090         return 0;
2091 }
2092
2093 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
2094                                     unsigned long long *sta)
2095 {
2096         acpi_status status;
2097         acpi_object_type acpi_type;
2098
2099         status = acpi_get_type(handle, &acpi_type);
2100         if (ACPI_FAILURE(status))
2101                 return -ENODEV;
2102
2103         switch (acpi_type) {
2104         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
2105         case ACPI_TYPE_DEVICE:
2106                 *type = ACPI_BUS_TYPE_DEVICE;
2107                 status = acpi_bus_get_status_handle(handle, sta);
2108                 if (ACPI_FAILURE(status))
2109                         return -ENODEV;
2110                 break;
2111         case ACPI_TYPE_PROCESSOR:
2112                 *type = ACPI_BUS_TYPE_PROCESSOR;
2113                 status = acpi_bus_get_status_handle(handle, sta);
2114                 if (ACPI_FAILURE(status))
2115                         return -ENODEV;
2116                 break;
2117         case ACPI_TYPE_THERMAL:
2118                 *type = ACPI_BUS_TYPE_THERMAL;
2119                 *sta = ACPI_STA_DEFAULT;
2120                 break;
2121         case ACPI_TYPE_POWER:
2122                 *type = ACPI_BUS_TYPE_POWER;
2123                 *sta = ACPI_STA_DEFAULT;
2124                 break;
2125         default:
2126                 return -ENODEV;
2127         }
2128
2129         return 0;
2130 }
2131
2132 bool acpi_device_is_present(struct acpi_device *adev)
2133 {
2134         if (adev->status.present || adev->status.functional)
2135                 return true;
2136
2137         adev->flags.initialized = false;
2138         return false;
2139 }
2140
2141 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
2142                                        char *idstr,
2143                                        const struct acpi_device_id **matchid)
2144 {
2145         const struct acpi_device_id *devid;
2146
2147         if (handler->match)
2148                 return handler->match(idstr, matchid);
2149
2150         for (devid = handler->ids; devid->id[0]; devid++)
2151                 if (!strcmp((char *)devid->id, idstr)) {
2152                         if (matchid)
2153                                 *matchid = devid;
2154
2155                         return true;
2156                 }
2157
2158         return false;
2159 }
2160
2161 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
2162                                         const struct acpi_device_id **matchid)
2163 {
2164         struct acpi_scan_handler *handler;
2165
2166         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
2167                 if (acpi_scan_handler_matching(handler, idstr, matchid))
2168                         return handler;
2169
2170         return NULL;
2171 }
2172
2173 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2174 {
2175         if (!!hotplug->enabled == !!val)
2176                 return;
2177
2178         mutex_lock(&acpi_scan_lock);
2179
2180         hotplug->enabled = val;
2181
2182         mutex_unlock(&acpi_scan_lock);
2183 }
2184
2185 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2186 {
2187         struct acpi_hardware_id *hwid;
2188
2189         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2190                 acpi_dock_add(adev);
2191                 return;
2192         }
2193         list_for_each_entry(hwid, &adev->pnp.ids, list) {
2194                 struct acpi_scan_handler *handler;
2195
2196                 handler = acpi_scan_match_handler(hwid->id, NULL);
2197                 if (handler) {
2198                         adev->flags.hotplug_notify = true;
2199                         break;
2200                 }
2201         }
2202 }
2203
2204 static void acpi_device_dep_initialize(struct acpi_device *adev)
2205 {
2206         struct acpi_dep_data *dep;
2207         struct acpi_handle_list dep_devices;
2208         acpi_status status;
2209         int i;
2210
2211         if (!acpi_has_method(adev->handle, "_DEP"))
2212                 return;
2213
2214         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
2215                                         &dep_devices);
2216         if (ACPI_FAILURE(status)) {
2217                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
2218                 return;
2219         }
2220
2221         for (i = 0; i < dep_devices.count; i++) {
2222                 struct acpi_device_info *info;
2223                 int skip;
2224
2225                 status = acpi_get_object_info(dep_devices.handles[i], &info);
2226                 if (ACPI_FAILURE(status)) {
2227                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
2228                         continue;
2229                 }
2230
2231                 /*
2232                  * Skip the dependency of Windows System Power
2233                  * Management Controller
2234                  */
2235                 skip = info->valid & ACPI_VALID_HID &&
2236                         !strcmp(info->hardware_id.string, "INT3396");
2237
2238                 kfree(info);
2239
2240                 if (skip)
2241                         continue;
2242
2243                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
2244                 if (!dep)
2245                         return;
2246
2247                 dep->master = dep_devices.handles[i];
2248                 dep->slave  = adev->handle;
2249                 adev->dep_unmet++;
2250
2251                 mutex_lock(&acpi_dep_list_lock);
2252                 list_add_tail(&dep->node , &acpi_dep_list);
2253                 mutex_unlock(&acpi_dep_list_lock);
2254         }
2255 }
2256
2257 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2258                                       void *not_used, void **return_value)
2259 {
2260         struct acpi_device *device = NULL;
2261         int type;
2262         unsigned long long sta;
2263         int result;
2264
2265         acpi_bus_get_device(handle, &device);
2266         if (device)
2267                 goto out;
2268
2269         result = acpi_bus_type_and_status(handle, &type, &sta);
2270         if (result)
2271                 return AE_OK;
2272
2273         if (type == ACPI_BUS_TYPE_POWER) {
2274                 acpi_add_power_resource(handle);
2275                 return AE_OK;
2276         }
2277
2278         acpi_add_single_object(&device, handle, type, sta);
2279         if (!device)
2280                 return AE_CTRL_DEPTH;
2281
2282         acpi_scan_init_hotplug(device);
2283         acpi_device_dep_initialize(device);
2284
2285  out:
2286         if (!*return_value)
2287                 *return_value = device;
2288
2289         return AE_OK;
2290 }
2291
2292 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
2293 {
2294         bool *is_spi_i2c_slave_p = data;
2295
2296         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
2297                 return 1;
2298
2299         /*
2300          * devices that are connected to UART still need to be enumerated to
2301          * platform bus
2302          */
2303         if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
2304                 *is_spi_i2c_slave_p = true;
2305
2306          /* no need to do more checking */
2307         return -1;
2308 }
2309
2310 static void acpi_default_enumeration(struct acpi_device *device)
2311 {
2312         struct list_head resource_list;
2313         bool is_spi_i2c_slave = false;
2314
2315         if (!device->pnp.type.platform_id || device->handler)
2316                 return;
2317
2318         /*
2319          * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2320          * respective parents.
2321          */
2322         INIT_LIST_HEAD(&resource_list);
2323         acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
2324                                &is_spi_i2c_slave);
2325         acpi_dev_free_resource_list(&resource_list);
2326         if (!is_spi_i2c_slave)
2327                 acpi_create_platform_device(device);
2328 }
2329
2330 static int acpi_scan_attach_handler(struct acpi_device *device)
2331 {
2332         struct acpi_hardware_id *hwid;
2333         int ret = 0;
2334
2335         list_for_each_entry(hwid, &device->pnp.ids, list) {
2336                 const struct acpi_device_id *devid;
2337                 struct acpi_scan_handler *handler;
2338
2339                 handler = acpi_scan_match_handler(hwid->id, &devid);
2340                 if (handler) {
2341                         if (!handler->attach) {
2342                                 device->pnp.type.platform_id = 0;
2343                                 continue;
2344                         }
2345                         device->handler = handler;
2346                         ret = handler->attach(device, devid);
2347                         if (ret > 0)
2348                                 break;
2349
2350                         device->handler = NULL;
2351                         if (ret < 0)
2352                                 break;
2353                 }
2354         }
2355         if (!ret)
2356                 acpi_default_enumeration(device);
2357
2358         return ret;
2359 }
2360
2361 static void acpi_bus_attach(struct acpi_device *device)
2362 {
2363         struct acpi_device *child;
2364         acpi_handle ejd;
2365         int ret;
2366
2367         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2368                 register_dock_dependent_device(device, ejd);
2369
2370         acpi_bus_get_status(device);
2371         /* Skip devices that are not present. */
2372         if (!acpi_device_is_present(device)) {
2373                 device->flags.visited = false;
2374                 return;
2375         }
2376         if (device->handler)
2377                 goto ok;
2378
2379         if (!device->flags.initialized) {
2380                 acpi_bus_update_power(device, NULL);
2381                 device->flags.initialized = true;
2382         }
2383         device->flags.visited = false;
2384         ret = acpi_scan_attach_handler(device);
2385         if (ret < 0)
2386                 return;
2387
2388         device->flags.match_driver = true;
2389         if (!ret) {
2390                 ret = device_attach(&device->dev);
2391                 if (ret < 0)
2392                         return;
2393         }
2394         device->flags.visited = true;
2395
2396  ok:
2397         list_for_each_entry(child, &device->children, node)
2398                 acpi_bus_attach(child);
2399
2400         if (device->handler && device->handler->hotplug.notify_online)
2401                 device->handler->hotplug.notify_online(device);
2402 }
2403
2404 void acpi_walk_dep_device_list(acpi_handle handle)
2405 {
2406         struct acpi_dep_data *dep, *tmp;
2407         struct acpi_device *adev;
2408
2409         mutex_lock(&acpi_dep_list_lock);
2410         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2411                 if (dep->master == handle) {
2412                         acpi_bus_get_device(dep->slave, &adev);
2413                         if (!adev)
2414                                 continue;
2415
2416                         adev->dep_unmet--;
2417                         if (!adev->dep_unmet)
2418                                 acpi_bus_attach(adev);
2419                         list_del(&dep->node);
2420                         kfree(dep);
2421                 }
2422         }
2423         mutex_unlock(&acpi_dep_list_lock);
2424 }
2425 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2426
2427 /**
2428  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2429  * @handle: Root of the namespace scope to scan.
2430  *
2431  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2432  * found devices.
2433  *
2434  * If no devices were found, -ENODEV is returned, but it does not mean that
2435  * there has been a real error.  There just have been no suitable ACPI objects
2436  * in the table trunk from which the kernel could create a device and add an
2437  * appropriate driver.
2438  *
2439  * Must be called under acpi_scan_lock.
2440  */
2441 int acpi_bus_scan(acpi_handle handle)
2442 {
2443         void *device = NULL;
2444
2445         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2446                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2447                                     acpi_bus_check_add, NULL, NULL, &device);
2448
2449         if (device) {
2450                 acpi_bus_attach(device);
2451                 return 0;
2452         }
2453         return -ENODEV;
2454 }
2455 EXPORT_SYMBOL(acpi_bus_scan);
2456
2457 /**
2458  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2459  * @adev: Root of the ACPI namespace scope to walk.
2460  *
2461  * Must be called under acpi_scan_lock.
2462  */
2463 void acpi_bus_trim(struct acpi_device *adev)
2464 {
2465         struct acpi_scan_handler *handler = adev->handler;
2466         struct acpi_device *child;
2467
2468         list_for_each_entry_reverse(child, &adev->children, node)
2469                 acpi_bus_trim(child);
2470
2471         adev->flags.match_driver = false;
2472         if (handler) {
2473                 if (handler->detach)
2474                         handler->detach(adev);
2475
2476                 adev->handler = NULL;
2477         } else {
2478                 device_release_driver(&adev->dev);
2479         }
2480         /*
2481          * Most likely, the device is going away, so put it into D3cold before
2482          * that.
2483          */
2484         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2485         adev->flags.initialized = false;
2486         adev->flags.visited = false;
2487 }
2488 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2489
2490 static int acpi_bus_scan_fixed(void)
2491 {
2492         int result = 0;
2493
2494         /*
2495          * Enumerate all fixed-feature devices.
2496          */
2497         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2498                 struct acpi_device *device = NULL;
2499
2500                 result = acpi_add_single_object(&device, NULL,
2501                                                 ACPI_BUS_TYPE_POWER_BUTTON,
2502                                                 ACPI_STA_DEFAULT);
2503                 if (result)
2504                         return result;
2505
2506                 device->flags.match_driver = true;
2507                 result = device_attach(&device->dev);
2508                 if (result < 0)
2509                         return result;
2510
2511                 device_init_wakeup(&device->dev, true);
2512         }
2513
2514         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2515                 struct acpi_device *device = NULL;
2516
2517                 result = acpi_add_single_object(&device, NULL,
2518                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
2519                                                 ACPI_STA_DEFAULT);
2520                 if (result)
2521                         return result;
2522
2523                 device->flags.match_driver = true;
2524                 result = device_attach(&device->dev);
2525         }
2526
2527         return result < 0 ? result : 0;
2528 }
2529
2530 int __init acpi_scan_init(void)
2531 {
2532         int result;
2533
2534         result = bus_register(&acpi_bus_type);
2535         if (result) {
2536                 /* We don't want to quit even if we failed to add suspend/resume */
2537                 printk(KERN_ERR PREFIX "Could not register bus type\n");
2538         }
2539
2540         acpi_pci_root_init();
2541         acpi_pci_link_init();
2542         acpi_processor_init();
2543         acpi_lpss_init();
2544         acpi_cmos_rtc_init();
2545         acpi_container_init();
2546         acpi_memory_hotplug_init();
2547         acpi_pnp_init();
2548         acpi_int340x_thermal_init();
2549
2550         mutex_lock(&acpi_scan_lock);
2551         /*
2552          * Enumerate devices in the ACPI namespace.
2553          */
2554         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2555         if (result)
2556                 goto out;
2557
2558         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2559         if (result)
2560                 goto out;
2561
2562         /* Fixed feature devices do not exist on HW-reduced platform */
2563         if (!acpi_gbl_reduced_hardware) {
2564                 result = acpi_bus_scan_fixed();
2565                 if (result) {
2566                         acpi_detach_data(acpi_root->handle,
2567                                          acpi_scan_drop_device);
2568                         acpi_device_del(acpi_root);
2569                         put_device(&acpi_root->dev);
2570                         goto out;
2571                 }
2572         }
2573
2574         acpi_update_all_gpes();
2575
2576  out:
2577         mutex_unlock(&acpi_scan_lock);
2578         return result;
2579 }