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 <acpi/acpi_drivers.h>
  16
  17 #include "internal.h"
  18
  19 #define _COMPONENT              ACPI_BUS_COMPONENT
  20 ACPI_MODULE_NAME("scan");
  21 #define STRUCT_TO_INT(s)        (*((int*)&s))
  22 extern struct acpi_device *acpi_root;
  23
  24 #define ACPI_BUS_CLASS                  "system_bus"
  25 #define ACPI_BUS_HID                    "LNXSYBUS"
  26 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  27
  28 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  29
  30 static const char *dummy_hid = "device";
  31
  32 /*
  33  * The following ACPI IDs are known to be suitable for representing as
  34  * platform devices.
  35  */
  36 static const struct acpi_device_id acpi_platform_device_ids[] = {
  37
  38         { "PNP0D40" },
  39
  40         /* Haswell LPSS devices */
  41         { "INT33C0", 0 },
  42         { "INT33C1", 0 },
  43         { "INT33C2", 0 },
  44         { "INT33C3", 0 },
  45         { "INT33C4", 0 },
  46         { "INT33C5", 0 },
  47         { "INT33C6", 0 },
  48         { "INT33C7", 0 },
  49
  50         { }
  51 };
  52
  53 static LIST_HEAD(acpi_device_list);
  54 static LIST_HEAD(acpi_bus_id_list);
  55 DEFINE_MUTEX(acpi_device_lock);
  56 LIST_HEAD(acpi_wakeup_device_list);
  57
  58 struct acpi_device_bus_id{
  59         char bus_id[15];
  60         unsigned int instance_no;
  61         struct list_head node;
  62 };
  63
  64 /*
  65  * Creates hid/cid(s) string needed for modalias and uevent
  66  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  67  * char *modalias: "acpi:IBM0001:ACPI0001"
  68 */
  69 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  70                            int size)
  71 {
  72         int len;
  73         int count;
  74         struct acpi_hardware_id *id;
  75
  76         if (list_empty(&acpi_dev->pnp.ids))
  77                 return 0;
  78
  79         len = snprintf(modalias, size, "acpi:");
  80         size -= len;
  81
  82         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
  83                 count = snprintf(&modalias[len], size, "%s:", id->id);
  84                 if (count < 0 || count >= size)
  85                         return -EINVAL;
  86                 len += count;
  87                 size -= count;
  88         }
  89
  90         modalias[len] = '\0';
  91         return len;
  92 }
  93
  94 static ssize_t
  95 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  96         struct acpi_device *acpi_dev = to_acpi_device(dev);
  97         int len;
  98
  99         /* Device has no HID and no CID or string is >1024 */
 100         len = create_modalias(acpi_dev, buf, 1024);
 101         if (len <= 0)
 102                 return 0;
 103         buf[len++] = '\n';
 104         return len;
 105 }
 106 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 107
 108 /**
 109  * acpi_bus_hot_remove_device: hot-remove a device and its children
 110  * @context: struct acpi_eject_event pointer (freed in this func)
 111  *
 112  * Hot-remove a device and its children. This function frees up the
 113  * memory space passed by arg context, so that the caller may call
 114  * this function asynchronously through acpi_os_hotplug_execute().
 115  */
 116 void acpi_bus_hot_remove_device(void *context)
 117 {
 118         struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
 119         struct acpi_device *device = ej_event->device;
 120         acpi_handle handle = device->handle;
 121         acpi_handle temp;
 122         struct acpi_object_list arg_list;
 123         union acpi_object arg;
 124         acpi_status status = AE_OK;
 125         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 126
 127         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 128                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 129
 130         if (acpi_bus_trim(device)) {
 131                 printk(KERN_ERR PREFIX
 132                                 "Removing device failed\n");
 133                 goto err_out;
 134         }
 135
 136         /* device has been freed */
 137         device = NULL;
 138
 139         /* power off device */
 140         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 141         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 142                 printk(KERN_WARNING PREFIX
 143                                 "Power-off device failed\n");
 144
 145         if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
 146                 arg_list.count = 1;
 147                 arg_list.pointer = &arg;
 148                 arg.type = ACPI_TYPE_INTEGER;
 149                 arg.integer.value = 0;
 150                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 151         }
 152
 153         arg_list.count = 1;
 154         arg_list.pointer = &arg;
 155         arg.type = ACPI_TYPE_INTEGER;
 156         arg.integer.value = 1;
 157
 158         /*
 159          * TBD: _EJD support.
 160          */
 161         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 162         if (ACPI_FAILURE(status)) {
 163                 if (status != AE_NOT_FOUND)
 164                         printk(KERN_WARNING PREFIX
 165                                         "Eject device failed\n");
 166                 goto err_out;
 167         }
 168
 169         kfree(context);
 170         return;
 171
 172 err_out:
 173         /* Inform firmware the hot-remove operation has completed w/ error */
 174         (void) acpi_evaluate_hotplug_ost(handle,
 175                                 ej_event->event, ost_code, NULL);
 176         kfree(context);
 177         return;
 178 }
 179 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 180
 181 static ssize_t
 182 acpi_eject_store(struct device *d, struct device_attribute *attr,
 183                 const char *buf, size_t count)
 184 {
 185         int ret = count;
 186         acpi_status status;
 187         acpi_object_type type = 0;
 188         struct acpi_device *acpi_device = to_acpi_device(d);
 189         struct acpi_eject_event *ej_event;
 190
 191         if ((!count) || (buf[0] != '1')) {
 192                 return -EINVAL;
 193         }
 194 #ifndef FORCE_EJECT
 195         if (acpi_device->driver == NULL) {
 196                 ret = -ENODEV;
 197                 goto err;
 198         }
 199 #endif
 200         status = acpi_get_type(acpi_device->handle, &type);
 201         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 202                 ret = -ENODEV;
 203                 goto err;
 204         }
 205
 206         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 207         if (!ej_event) {
 208                 ret = -ENOMEM;
 209                 goto err;
 210         }
 211
 212         ej_event->device = acpi_device;
 213         if (acpi_device->flags.eject_pending) {
 214                 /* event originated from ACPI eject notification */
 215                 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
 216                 acpi_device->flags.eject_pending = 0;
 217         } else {
 218                 /* event originated from user */
 219                 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
 220                 (void) acpi_evaluate_hotplug_ost(acpi_device->handle,
 221                         ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 222         }
 223
 224         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
 225 err:
 226         return ret;
 227 }
 228
 229 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 230
 231 static ssize_t
 232 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 233         struct acpi_device *acpi_dev = to_acpi_device(dev);
 234
 235         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 236 }
 237 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 238
 239 static ssize_t acpi_device_uid_show(struct device *dev,
 240                                     struct device_attribute *attr, char *buf)
 241 {
 242         struct acpi_device *acpi_dev = to_acpi_device(dev);
 243
 244         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 245 }
 246 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 247
 248 static ssize_t acpi_device_adr_show(struct device *dev,
 249                                     struct device_attribute *attr, char *buf)
 250 {
 251         struct acpi_device *acpi_dev = to_acpi_device(dev);
 252
 253         return sprintf(buf, "0x%08x\n",
 254                        (unsigned int)(acpi_dev->pnp.bus_address));
 255 }
 256 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 257
 258 static ssize_t
 259 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 260         struct acpi_device *acpi_dev = to_acpi_device(dev);
 261         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 262         int result;
 263
 264         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 265         if (result)
 266                 goto end;
 267
 268         result = sprintf(buf, "%s\n", (char*)path.pointer);
 269         kfree(path.pointer);
 270 end:
 271         return result;
 272 }
 273 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 274
 275 /* sysfs file that shows description text from the ACPI _STR method */
 276 static ssize_t description_show(struct device *dev,
 277                                 struct device_attribute *attr,
 278                                 char *buf) {
 279         struct acpi_device *acpi_dev = to_acpi_device(dev);
 280         int result;
 281
 282         if (acpi_dev->pnp.str_obj == NULL)
 283                 return 0;
 284
 285         /*
 286          * The _STR object contains a Unicode identifier for a device.
 287          * We need to convert to utf-8 so it can be displayed.
 288          */
 289         result = utf16s_to_utf8s(
 290                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 291                 acpi_dev->pnp.str_obj->buffer.length,
 292                 UTF16_LITTLE_ENDIAN, buf,
 293                 PAGE_SIZE);
 294
 295         buf[result++] = '\n';
 296
 297         return result;
 298 }
 299 static DEVICE_ATTR(description, 0444, description_show, NULL);
 300
 301 static ssize_t
 302 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 303                      char *buf) {
 304         struct acpi_device *acpi_dev = to_acpi_device(dev);
 305
 306         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 307 }
 308 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 309
 310 static int acpi_device_setup_files(struct acpi_device *dev)
 311 {
 312         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 313         acpi_status status;
 314         acpi_handle temp;
 315         unsigned long long sun;
 316         int result = 0;
 317
 318         /*
 319          * Devices gotten from FADT don't have a "path" attribute
 320          */
 321         if (dev->handle) {
 322                 result = device_create_file(&dev->dev, &dev_attr_path);
 323                 if (result)
 324                         goto end;
 325         }
 326
 327         if (!list_empty(&dev->pnp.ids)) {
 328                 result = device_create_file(&dev->dev, &dev_attr_hid);
 329                 if (result)
 330                         goto end;
 331
 332                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 333                 if (result)
 334                         goto end;
 335         }
 336
 337         /*
 338          * If device has _STR, 'description' file is created
 339          */
 340         status = acpi_get_handle(dev->handle, "_STR", &temp);
 341         if (ACPI_SUCCESS(status)) {
 342                 status = acpi_evaluate_object(dev->handle, "_STR",
 343                                         NULL, &buffer);
 344                 if (ACPI_FAILURE(status))
 345                         buffer.pointer = NULL;
 346                 dev->pnp.str_obj = buffer.pointer;
 347                 result = device_create_file(&dev->dev, &dev_attr_description);
 348                 if (result)
 349                         goto end;
 350         }
 351
 352         if (dev->flags.bus_address)
 353                 result = device_create_file(&dev->dev, &dev_attr_adr);
 354         if (dev->pnp.unique_id)
 355                 result = device_create_file(&dev->dev, &dev_attr_uid);
 356
 357         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 358         if (ACPI_SUCCESS(status)) {
 359                 dev->pnp.sun = (unsigned long)sun;
 360                 result = device_create_file(&dev->dev, &dev_attr_sun);
 361                 if (result)
 362                         goto end;
 363         } else {
 364                 dev->pnp.sun = (unsigned long)-1;
 365         }
 366
 367         /*
 368          * If device has _EJ0, 'eject' file is created that is used to trigger
 369          * hot-removal function from userland.
 370          */
 371         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 372         if (ACPI_SUCCESS(status))
 373                 result = device_create_file(&dev->dev, &dev_attr_eject);
 374 end:
 375         return result;
 376 }
 377
 378 static void acpi_device_remove_files(struct acpi_device *dev)
 379 {
 380         acpi_status status;
 381         acpi_handle temp;
 382
 383         /*
 384          * If device has _STR, remove 'description' file
 385          */
 386         status = acpi_get_handle(dev->handle, "_STR", &temp);
 387         if (ACPI_SUCCESS(status)) {
 388                 kfree(dev->pnp.str_obj);
 389                 device_remove_file(&dev->dev, &dev_attr_description);
 390         }
 391         /*
 392          * If device has _EJ0, remove 'eject' file.
 393          */
 394         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 395         if (ACPI_SUCCESS(status))
 396                 device_remove_file(&dev->dev, &dev_attr_eject);
 397
 398         status = acpi_get_handle(dev->handle, "_SUN", &temp);
 399         if (ACPI_SUCCESS(status))
 400                 device_remove_file(&dev->dev, &dev_attr_sun);
 401
 402         if (dev->pnp.unique_id)
 403                 device_remove_file(&dev->dev, &dev_attr_uid);
 404         if (dev->flags.bus_address)
 405                 device_remove_file(&dev->dev, &dev_attr_adr);
 406         device_remove_file(&dev->dev, &dev_attr_modalias);
 407         device_remove_file(&dev->dev, &dev_attr_hid);
 408         if (dev->handle)
 409                 device_remove_file(&dev->dev, &dev_attr_path);
 410 }
 411 /* --------------------------------------------------------------------------
 412                         ACPI Bus operations
 413    -------------------------------------------------------------------------- */
 414
 415 static const struct acpi_device_id *__acpi_match_device(
 416         struct acpi_device *device, const struct acpi_device_id *ids)
 417 {
 418         const struct acpi_device_id *id;
 419         struct acpi_hardware_id *hwid;
 420
 421         /*
 422          * If the device is not present, it is unnecessary to load device
 423          * driver for it.
 424          */
 425         if (!device->status.present)
 426                 return NULL;
 427
 428         for (id = ids; id->id[0]; id++)
 429                 list_for_each_entry(hwid, &device->pnp.ids, list)
 430                         if (!strcmp((char *) id->id, hwid->id))
 431                                 return id;
 432
 433         return NULL;
 434 }
 435
 436 /**
 437  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 438  * @ids: Array of struct acpi_device_id object to match against.
 439  * @dev: The device structure to match.
 440  *
 441  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 442  * object for that handle and use that object to match against a given list of
 443  * device IDs.
 444  *
 445  * Return a pointer to the first matching ID on success or %NULL on failure.
 446  */
 447 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 448                                                const struct device *dev)
 449 {
 450         struct acpi_device *adev;
 451
 452         if (!ids || !ACPI_HANDLE(dev)
 453             || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
 454                 return NULL;
 455
 456         return __acpi_match_device(adev, ids);
 457 }
 458 EXPORT_SYMBOL_GPL(acpi_match_device);
 459
 460 int acpi_match_device_ids(struct acpi_device *device,
 461                           const struct acpi_device_id *ids)
 462 {
 463         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 464 }
 465 EXPORT_SYMBOL(acpi_match_device_ids);
 466
 467 static void acpi_free_ids(struct acpi_device *device)
 468 {
 469         struct acpi_hardware_id *id, *tmp;
 470
 471         list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
 472                 kfree(id->id);
 473                 kfree(id);
 474         }
 475         kfree(device->pnp.unique_id);
 476 }
 477
 478 static void acpi_device_release(struct device *dev)
 479 {
 480         struct acpi_device *acpi_dev = to_acpi_device(dev);
 481
 482         acpi_free_ids(acpi_dev);
 483         kfree(acpi_dev);
 484 }
 485
 486 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 487 {
 488         struct acpi_device *acpi_dev = to_acpi_device(dev);
 489         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 490
 491         return acpi_dev->flags.match_driver
 492                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 493 }
 494
 495 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 496 {
 497         struct acpi_device *acpi_dev = to_acpi_device(dev);
 498         int len;
 499
 500         if (list_empty(&acpi_dev->pnp.ids))
 501                 return 0;
 502
 503         if (add_uevent_var(env, "MODALIAS="))
 504                 return -ENOMEM;
 505         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 506                               sizeof(env->buf) - env->buflen);
 507         if (len >= (sizeof(env->buf) - env->buflen))
 508                 return -ENOMEM;
 509         env->buflen += len;
 510         return 0;
 511 }
 512
 513 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 514 {
 515         struct acpi_device *device = data;
 516
 517         device->driver->ops.notify(device, event);
 518 }
 519
 520 static acpi_status acpi_device_notify_fixed(void *data)
 521 {
 522         struct acpi_device *device = data;
 523
 524         /* Fixed hardware devices have no handles */
 525         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 526         return AE_OK;
 527 }
 528
 529 static int acpi_device_install_notify_handler(struct acpi_device *device)
 530 {
 531         acpi_status status;
 532
 533         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 534                 status =
 535                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 536                                                      acpi_device_notify_fixed,
 537                                                      device);
 538         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 539                 status =
 540                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 541                                                      acpi_device_notify_fixed,
 542                                                      device);
 543         else
 544                 status = acpi_install_notify_handler(device->handle,
 545                                                      ACPI_DEVICE_NOTIFY,
 546                                                      acpi_device_notify,
 547                                                      device);
 548
 549         if (ACPI_FAILURE(status))
 550                 return -EINVAL;
 551         return 0;
 552 }
 553
 554 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 555 {
 556         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 557                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 558                                                 acpi_device_notify_fixed);
 559         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 560                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 561                                                 acpi_device_notify_fixed);
 562         else
 563                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 564                                            acpi_device_notify);
 565 }
 566
 567 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 568 static int acpi_device_probe(struct device * dev)
 569 {
 570         struct acpi_device *acpi_dev = to_acpi_device(dev);
 571         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 572         int ret;
 573
 574         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 575         if (!ret) {
 576                 if (acpi_drv->ops.notify) {
 577                         ret = acpi_device_install_notify_handler(acpi_dev);
 578                         if (ret) {
 579                                 if (acpi_drv->ops.remove)
 580                                         acpi_drv->ops.remove(acpi_dev,
 581                                                      acpi_dev->removal_type);
 582                                 return ret;
 583                         }
 584                 }
 585
 586                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 587                         "Found driver [%s] for device [%s]\n",
 588                         acpi_drv->name, acpi_dev->pnp.bus_id));
 589                 get_device(dev);
 590         }
 591         return ret;
 592 }
 593
 594 static int acpi_device_remove(struct device * dev)
 595 {
 596         struct acpi_device *acpi_dev = to_acpi_device(dev);
 597         struct acpi_driver *acpi_drv = acpi_dev->driver;
 598
 599         if (acpi_drv) {
 600                 if (acpi_drv->ops.notify)
 601                         acpi_device_remove_notify_handler(acpi_dev);
 602                 if (acpi_drv->ops.remove)
 603                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 604         }
 605         acpi_dev->driver = NULL;
 606         acpi_dev->driver_data = NULL;
 607
 608         put_device(dev);
 609         return 0;
 610 }
 611
 612 struct bus_type acpi_bus_type = {
 613         .name           = "acpi",
 614         .match          = acpi_bus_match,
 615         .probe          = acpi_device_probe,
 616         .remove         = acpi_device_remove,
 617         .uevent         = acpi_device_uevent,
 618 };
 619
 620 static int acpi_device_register(struct acpi_device *device)
 621 {
 622         int result;
 623         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 624         int found = 0;
 625
 626         if (device->handle) {
 627                 acpi_status status;
 628
 629                 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
 630                                           device);
 631                 if (ACPI_FAILURE(status)) {
 632                         acpi_handle_err(device->handle,
 633                                         "Unable to attach device data\n");
 634                         return -ENODEV;
 635                 }
 636         }
 637
 638         /*
 639          * Linkage
 640          * -------
 641          * Link this device to its parent and siblings.
 642          */
 643         INIT_LIST_HEAD(&device->children);
 644         INIT_LIST_HEAD(&device->node);
 645         INIT_LIST_HEAD(&device->wakeup_list);
 646         INIT_LIST_HEAD(&device->physical_node_list);
 647         mutex_init(&device->physical_node_lock);
 648         INIT_LIST_HEAD(&device->power_dependent);
 649
 650         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 651         if (!new_bus_id) {
 652                 pr_err(PREFIX "Memory allocation error\n");
 653                 result = -ENOMEM;
 654                 goto err_detach;
 655         }
 656
 657         mutex_lock(&acpi_device_lock);
 658         /*
 659          * Find suitable bus_id and instance number in acpi_bus_id_list
 660          * If failed, create one and link it into acpi_bus_id_list
 661          */
 662         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 663                 if (!strcmp(acpi_device_bus_id->bus_id,
 664                             acpi_device_hid(device))) {
 665                         acpi_device_bus_id->instance_no++;
 666                         found = 1;
 667                         kfree(new_bus_id);
 668                         break;
 669                 }
 670         }
 671         if (!found) {
 672                 acpi_device_bus_id = new_bus_id;
 673                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 674                 acpi_device_bus_id->instance_no = 0;
 675                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 676         }
 677         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 678
 679         if (device->parent)
 680                 list_add_tail(&device->node, &device->parent->children);
 681
 682         if (device->wakeup.flags.valid)
 683                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 684         mutex_unlock(&acpi_device_lock);
 685
 686         if (device->parent)
 687                 device->dev.parent = &device->parent->dev;
 688         device->dev.bus = &acpi_bus_type;
 689         device->dev.release = &acpi_device_release;
 690         result = device_register(&device->dev);
 691         if (result) {
 692                 dev_err(&device->dev, "Error registering device\n");
 693                 goto err;
 694         }
 695
 696         result = acpi_device_setup_files(device);
 697         if (result)
 698                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 699                        dev_name(&device->dev));
 700
 701         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 702         return 0;
 703
 704  err:
 705         mutex_lock(&acpi_device_lock);
 706         if (device->parent)
 707                 list_del(&device->node);
 708         list_del(&device->wakeup_list);
 709         mutex_unlock(&acpi_device_lock);
 710
 711  err_detach:
 712         acpi_detach_data(device->handle, acpi_bus_data_handler);
 713         return result;
 714 }
 715
 716 static void acpi_device_unregister(struct acpi_device *device)
 717 {
 718         mutex_lock(&acpi_device_lock);
 719         if (device->parent)
 720                 list_del(&device->node);
 721
 722         list_del(&device->wakeup_list);
 723         mutex_unlock(&acpi_device_lock);
 724
 725         acpi_detach_data(device->handle, acpi_bus_data_handler);
 726
 727         acpi_power_add_remove_device(device, false);
 728         acpi_device_remove_files(device);
 729         device_unregister(&device->dev);
 730         /*
 731          * Drop the reference counts of all power resources the device depends
 732          * on and turn off the ones that have no more references.
 733          */
 734         acpi_power_transition(device, ACPI_STATE_D3_COLD);
 735 }
 736
 737 /* --------------------------------------------------------------------------
 738                                  Driver Management
 739    -------------------------------------------------------------------------- */
 740 /**
 741  * acpi_bus_driver_init - add a device to a driver
 742  * @device: the device to add and initialize
 743  * @driver: driver for the device
 744  *
 745  * Used to initialize a device via its device driver.  Called whenever a
 746  * driver is bound to a device.  Invokes the driver's add() ops.
 747  */
 748 static int
 749 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 750 {
 751         int result = 0;
 752
 753         if (!device || !driver)
 754                 return -EINVAL;
 755
 756         if (!driver->ops.add)
 757                 return -ENOSYS;
 758
 759         result = driver->ops.add(device);
 760         if (result) {
 761                 device->driver = NULL;
 762                 device->driver_data = NULL;
 763                 return result;
 764         }
 765
 766         device->driver = driver;
 767
 768         /*
 769          * TBD - Configuration Management: Assign resources to device based
 770          * upon possible configuration and currently allocated resources.
 771          */
 772
 773         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 774                           "Driver successfully bound to device\n"));
 775         return 0;
 776 }
 777
 778 /**
 779  * acpi_bus_register_driver - register a driver with the ACPI bus
 780  * @driver: driver being registered
 781  *
 782  * Registers a driver with the ACPI bus.  Searches the namespace for all
 783  * devices that match the driver's criteria and binds.  Returns zero for
 784  * success or a negative error status for failure.
 785  */
 786 int acpi_bus_register_driver(struct acpi_driver *driver)
 787 {
 788         int ret;
 789
 790         if (acpi_disabled)
 791                 return -ENODEV;
 792         driver->drv.name = driver->name;
 793         driver->drv.bus = &acpi_bus_type;
 794         driver->drv.owner = driver->owner;
 795
 796         ret = driver_register(&driver->drv);
 797         return ret;
 798 }
 799
 800 EXPORT_SYMBOL(acpi_bus_register_driver);
 801
 802 /**
 803  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 804  * @driver: driver to unregister
 805  *
 806  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 807  * devices that match the driver's criteria and unbinds.
 808  */
 809 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 810 {
 811         driver_unregister(&driver->drv);
 812 }
 813
 814 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 815
 816 /* --------------------------------------------------------------------------
 817                                  Device Enumeration
 818    -------------------------------------------------------------------------- */
 819 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 820 {
 821         acpi_status status;
 822         int ret;
 823         struct acpi_device *device;
 824
 825         /*
 826          * Fixed hardware devices do not appear in the namespace and do not
 827          * have handles, but we fabricate acpi_devices for them, so we have
 828          * to deal with them specially.
 829          */
 830         if (handle == NULL)
 831                 return acpi_root;
 832
 833         do {
 834                 status = acpi_get_parent(handle, &handle);
 835                 if (status == AE_NULL_ENTRY)
 836                         return NULL;
 837                 if (ACPI_FAILURE(status))
 838                         return acpi_root;
 839
 840                 ret = acpi_bus_get_device(handle, &device);
 841                 if (ret == 0)
 842                         return device;
 843         } while (1);
 844 }
 845
 846 acpi_status
 847 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 848 {
 849         acpi_status status;
 850         acpi_handle tmp;
 851         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 852         union acpi_object *obj;
 853
 854         status = acpi_get_handle(handle, "_EJD", &tmp);
 855         if (ACPI_FAILURE(status))
 856                 return status;
 857
 858         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 859         if (ACPI_SUCCESS(status)) {
 860                 obj = buffer.pointer;
 861                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 862                                          ejd);
 863                 kfree(buffer.pointer);
 864         }
 865         return status;
 866 }
 867 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 868
 869 void acpi_bus_data_handler(acpi_handle handle, void *context)
 870 {
 871
 872         /* TBD */
 873
 874         return;
 875 }
 876
 877 static acpi_status
 878 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 879                                              struct acpi_device_wakeup *wakeup)
 880 {
 881         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 882         union acpi_object *package = NULL;
 883         union acpi_object *element = NULL;
 884         acpi_status status;
 885         int i = 0;
 886
 887         if (!wakeup)
 888                 return AE_BAD_PARAMETER;
 889
 890         /* _PRW */
 891         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 892         if (ACPI_FAILURE(status)) {
 893                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 894                 return status;
 895         }
 896
 897         package = (union acpi_object *)buffer.pointer;
 898
 899         if (!package || (package->package.count < 2)) {
 900                 status = AE_BAD_DATA;
 901                 goto out;
 902         }
 903
 904         element = &(package->package.elements[0]);
 905         if (!element) {
 906                 status = AE_BAD_DATA;
 907                 goto out;
 908         }
 909         if (element->type == ACPI_TYPE_PACKAGE) {
 910                 if ((element->package.count < 2) ||
 911                     (element->package.elements[0].type !=
 912                      ACPI_TYPE_LOCAL_REFERENCE)
 913                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
 914                         status = AE_BAD_DATA;
 915                         goto out;
 916                 }
 917                 wakeup->gpe_device =
 918                     element->package.elements[0].reference.handle;
 919                 wakeup->gpe_number =
 920                     (u32) element->package.elements[1].integer.value;
 921         } else if (element->type == ACPI_TYPE_INTEGER) {
 922                 wakeup->gpe_device = NULL;
 923                 wakeup->gpe_number = element->integer.value;
 924         } else {
 925                 status = AE_BAD_DATA;
 926                 goto out;
 927         }
 928
 929         element = &(package->package.elements[1]);
 930         if (element->type != ACPI_TYPE_INTEGER) {
 931                 status = AE_BAD_DATA;
 932                 goto out;
 933         }
 934         wakeup->sleep_state = element->integer.value;
 935
 936         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 937                 status = AE_NO_MEMORY;
 938                 goto out;
 939         }
 940         wakeup->resources.count = package->package.count - 2;
 941         for (i = 0; i < wakeup->resources.count; i++) {
 942                 element = &(package->package.elements[i + 2]);
 943                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
 944                         status = AE_BAD_DATA;
 945                         goto out;
 946                 }
 947
 948                 wakeup->resources.handles[i] = element->reference.handle;
 949         }
 950
 951         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
 952
 953  out:
 954         kfree(buffer.pointer);
 955
 956         return status;
 957 }
 958
 959 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
 960 {
 961         struct acpi_device_id button_device_ids[] = {
 962                 {"PNP0C0C", 0},
 963                 {"PNP0C0D", 0},
 964                 {"PNP0C0E", 0},
 965                 {"", 0},
 966         };
 967         acpi_status status;
 968         acpi_event_status event_status;
 969
 970         device->wakeup.flags.notifier_present = 0;
 971
 972         /* Power button, Lid switch always enable wakeup */
 973         if (!acpi_match_device_ids(device, button_device_ids)) {
 974                 device->wakeup.flags.run_wake = 1;
 975                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 976                         /* Do not use Lid/sleep button for S5 wakeup */
 977                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
 978                                 device->wakeup.sleep_state = ACPI_STATE_S4;
 979                 }
 980                 device_set_wakeup_capable(&device->dev, true);
 981                 return;
 982         }
 983
 984         status = acpi_get_gpe_status(device->wakeup.gpe_device,
 985                                         device->wakeup.gpe_number,
 986                                                 &event_status);
 987         if (status == AE_OK)
 988                 device->wakeup.flags.run_wake =
 989                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
 990 }
 991
 992 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 993 {
 994         acpi_handle temp;
 995         acpi_status status = 0;
 996         int psw_error;
 997
 998         /* Presence of _PRW indicates wake capable */
 999         status = acpi_get_handle(device->handle, "_PRW", &temp);
1000         if (ACPI_FAILURE(status))
1001                 return;
1002
1003         status = acpi_bus_extract_wakeup_device_power_package(device->handle,
1004                                                               &device->wakeup);
1005         if (ACPI_FAILURE(status)) {
1006                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
1007                 return;
1008         }
1009
1010         device->wakeup.flags.valid = 1;
1011         device->wakeup.prepare_count = 0;
1012         acpi_bus_set_run_wake_flags(device);
1013         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1014          * system for the ACPI device with the _PRW object.
1015          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1016          * So it is necessary to call _DSW object first. Only when it is not
1017          * present will the _PSW object used.
1018          */
1019         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
1020         if (psw_error)
1021                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1022                                 "error in _DSW or _PSW evaluation\n"));
1023 }
1024
1025 static void acpi_bus_add_power_resource(acpi_handle handle);
1026
1027 static void acpi_bus_get_power_flags(struct acpi_device *device)
1028 {
1029         acpi_status status = 0;
1030         acpi_handle handle = NULL;
1031         u32 i = 0;
1032
1033         /* Power resources cannot be power manageable. */
1034         if (device->device_type == ACPI_BUS_TYPE_POWER)
1035                 return;
1036
1037         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1038         status = acpi_get_handle(device->handle, "_PS0", &handle);
1039         if (ACPI_FAILURE(status)) {
1040                 status = acpi_get_handle(device->handle, "_PR0", &handle);
1041                 if (ACPI_FAILURE(status))
1042                         return;
1043         }
1044
1045         device->flags.power_manageable = 1;
1046
1047         /*
1048          * Power Management Flags
1049          */
1050         status = acpi_get_handle(device->handle, "_PSC", &handle);
1051         if (ACPI_SUCCESS(status))
1052                 device->power.flags.explicit_get = 1;
1053         status = acpi_get_handle(device->handle, "_IRC", &handle);
1054         if (ACPI_SUCCESS(status))
1055                 device->power.flags.inrush_current = 1;
1056
1057         /*
1058          * Enumerate supported power management states
1059          */
1060         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1061                 struct acpi_device_power_state *ps = &device->power.states[i];
1062                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
1063
1064                 /* Evaluate "_PRx" to se if power resources are referenced */
1065                 acpi_evaluate_reference(device->handle, object_name, NULL,
1066                                         &ps->resources);
1067                 if (ps->resources.count) {
1068                         int j;
1069
1070                         device->power.flags.power_resources = 1;
1071                         for (j = 0; j < ps->resources.count; j++)
1072                                 acpi_bus_add_power_resource(ps->resources.handles[j]);
1073                 }
1074
1075                 /* Evaluate "_PSx" to see if we can do explicit sets */
1076                 object_name[2] = 'S';
1077                 status = acpi_get_handle(device->handle, object_name, &handle);
1078                 if (ACPI_SUCCESS(status))
1079                         ps->flags.explicit_set = 1;
1080
1081                 /*
1082                  * State is valid if there are means to put the device into it.
1083                  * D3hot is only valid if _PR3 present.
1084                  */
1085                 if (ps->resources.count ||
1086                     (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
1087                         ps->flags.valid = 1;
1088                         ps->flags.os_accessible = 1;
1089                 }
1090
1091                 ps->power = -1; /* Unknown - driver assigned */
1092                 ps->latency = -1;       /* Unknown - driver assigned */
1093         }
1094
1095         /* Set defaults for D0 and D3 states (always valid) */
1096         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1097         device->power.states[ACPI_STATE_D0].power = 100;
1098         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1099         device->power.states[ACPI_STATE_D3].power = 0;
1100
1101         /* Set D3cold's explicit_set flag if _PS3 exists. */
1102         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1103                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1104
1105         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1106         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1107                         device->power.flags.power_resources)
1108                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1109
1110         acpi_bus_init_power(device);
1111 }
1112
1113 static void acpi_bus_get_flags(struct acpi_device *device)
1114 {
1115         acpi_status status = AE_OK;
1116         acpi_handle temp = NULL;
1117
1118         /* Presence of _STA indicates 'dynamic_status' */
1119         status = acpi_get_handle(device->handle, "_STA", &temp);
1120         if (ACPI_SUCCESS(status))
1121                 device->flags.dynamic_status = 1;
1122
1123         /* Presence of _RMV indicates 'removable' */
1124         status = acpi_get_handle(device->handle, "_RMV", &temp);
1125         if (ACPI_SUCCESS(status))
1126                 device->flags.removable = 1;
1127
1128         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1129         status = acpi_get_handle(device->handle, "_EJD", &temp);
1130         if (ACPI_SUCCESS(status))
1131                 device->flags.ejectable = 1;
1132         else {
1133                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1134                 if (ACPI_SUCCESS(status))
1135                         device->flags.ejectable = 1;
1136         }
1137 }
1138
1139 static void acpi_device_get_busid(struct acpi_device *device)
1140 {
1141         char bus_id[5] = { '?', 0 };
1142         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1143         int i = 0;
1144
1145         /*
1146          * Bus ID
1147          * ------
1148          * The device's Bus ID is simply the object name.
1149          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1150          */
1151         if (ACPI_IS_ROOT_DEVICE(device)) {
1152                 strcpy(device->pnp.bus_id, "ACPI");
1153                 return;
1154         }
1155
1156         switch (device->device_type) {
1157         case ACPI_BUS_TYPE_POWER_BUTTON:
1158                 strcpy(device->pnp.bus_id, "PWRF");
1159                 break;
1160         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1161                 strcpy(device->pnp.bus_id, "SLPF");
1162                 break;
1163         default:
1164                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1165                 /* Clean up trailing underscores (if any) */
1166                 for (i = 3; i > 1; i--) {
1167                         if (bus_id[i] == '_')
1168                                 bus_id[i] = '\0';
1169                         else
1170                                 break;
1171                 }
1172                 strcpy(device->pnp.bus_id, bus_id);
1173                 break;
1174         }
1175 }
1176
1177 /*
1178  * acpi_bay_match - see if a device is an ejectable driver bay
1179  *
1180  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1181  * then we can safely call it an ejectable drive bay
1182  */
1183 static int acpi_bay_match(struct acpi_device *device){
1184         acpi_status status;
1185         acpi_handle handle;
1186         acpi_handle tmp;
1187         acpi_handle phandle;
1188
1189         handle = device->handle;
1190
1191         status = acpi_get_handle(handle, "_EJ0", &tmp);
1192         if (ACPI_FAILURE(status))
1193                 return -ENODEV;
1194
1195         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1196                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1197                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1198                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1199                 return 0;
1200
1201         if (acpi_get_parent(handle, &phandle))
1202                 return -ENODEV;
1203
1204         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1205                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1206                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1207                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1208                 return 0;
1209
1210         return -ENODEV;
1211 }
1212
1213 /*
1214  * acpi_dock_match - see if a device has a _DCK method
1215  */
1216 static int acpi_dock_match(struct acpi_device *device)
1217 {
1218         acpi_handle tmp;
1219         return acpi_get_handle(device->handle, "_DCK", &tmp);
1220 }
1221
1222 const char *acpi_device_hid(struct acpi_device *device)
1223 {
1224         struct acpi_hardware_id *hid;
1225
1226         if (list_empty(&device->pnp.ids))
1227                 return dummy_hid;
1228
1229         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1230         return hid->id;
1231 }
1232 EXPORT_SYMBOL(acpi_device_hid);
1233
1234 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1235 {
1236         struct acpi_hardware_id *id;
1237
1238         id = kmalloc(sizeof(*id), GFP_KERNEL);
1239         if (!id)
1240                 return;
1241
1242         id->id = kstrdup(dev_id, GFP_KERNEL);
1243         if (!id->id) {
1244                 kfree(id);
1245                 return;
1246         }
1247
1248         list_add_tail(&id->list, &device->pnp.ids);
1249 }
1250
1251 /*
1252  * Old IBM workstations have a DSDT bug wherein the SMBus object
1253  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1254  * prefix.  Work around this.
1255  */
1256 static int acpi_ibm_smbus_match(struct acpi_device *device)
1257 {
1258         acpi_handle h_dummy;
1259         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1260         int result;
1261
1262         if (!dmi_name_in_vendors("IBM"))
1263                 return -ENODEV;
1264
1265         /* Look for SMBS object */
1266         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1267         if (result)
1268                 return result;
1269
1270         if (strcmp("SMBS", path.pointer)) {
1271                 result = -ENODEV;
1272                 goto out;
1273         }
1274
1275         /* Does it have the necessary (but misnamed) methods? */
1276         result = -ENODEV;
1277         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1278             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1279             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1280                 result = 0;
1281 out:
1282         kfree(path.pointer);
1283         return result;
1284 }
1285
1286 static void acpi_device_set_id(struct acpi_device *device)
1287 {
1288         acpi_status status;
1289         struct acpi_device_info *info;
1290         struct acpi_pnp_device_id_list *cid_list;
1291         int i;
1292
1293         switch (device->device_type) {
1294         case ACPI_BUS_TYPE_DEVICE:
1295                 if (ACPI_IS_ROOT_DEVICE(device)) {
1296                         acpi_add_id(device, ACPI_SYSTEM_HID);
1297                         break;
1298                 }
1299
1300                 status = acpi_get_object_info(device->handle, &info);
1301                 if (ACPI_FAILURE(status)) {
1302                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1303                         return;
1304                 }
1305
1306                 if (info->valid & ACPI_VALID_HID)
1307                         acpi_add_id(device, info->hardware_id.string);
1308                 if (info->valid & ACPI_VALID_CID) {
1309                         cid_list = &info->compatible_id_list;
1310                         for (i = 0; i < cid_list->count; i++)
1311                                 acpi_add_id(device, cid_list->ids[i].string);
1312                 }
1313                 if (info->valid & ACPI_VALID_ADR) {
1314                         device->pnp.bus_address = info->address;
1315                         device->flags.bus_address = 1;
1316                 }
1317                 if (info->valid & ACPI_VALID_UID)
1318                         device->pnp.unique_id = kstrdup(info->unique_id.string,
1319                                                         GFP_KERNEL);
1320
1321                 kfree(info);
1322
1323                 /*
1324                  * Some devices don't reliably have _HIDs & _CIDs, so add
1325                  * synthetic HIDs to make sure drivers can find them.
1326                  */
1327                 if (acpi_is_video_device(device))
1328                         acpi_add_id(device, ACPI_VIDEO_HID);
1329                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1330                         acpi_add_id(device, ACPI_BAY_HID);
1331                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1332                         acpi_add_id(device, ACPI_DOCK_HID);
1333                 else if (!acpi_ibm_smbus_match(device))
1334                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1335                 else if (list_empty(&device->pnp.ids) &&
1336                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1337                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1338                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1339                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1340                 }
1341
1342                 break;
1343         case ACPI_BUS_TYPE_POWER:
1344                 acpi_add_id(device, ACPI_POWER_HID);
1345                 break;
1346         case ACPI_BUS_TYPE_PROCESSOR:
1347                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1348                 break;
1349         case ACPI_BUS_TYPE_THERMAL:
1350                 acpi_add_id(device, ACPI_THERMAL_HID);
1351                 break;
1352         case ACPI_BUS_TYPE_POWER_BUTTON:
1353                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1354                 break;
1355         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1356                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1357                 break;
1358         }
1359 }
1360
1361 static void acpi_init_device_object(struct acpi_device *device,
1362                                      acpi_handle handle,
1363                                      int type, unsigned long long sta)
1364 {
1365         INIT_LIST_HEAD(&device->pnp.ids);
1366         device->device_type = type;
1367         device->handle = handle;
1368         device->parent = acpi_bus_get_parent(handle);
1369         STRUCT_TO_INT(device->status) = sta;
1370         acpi_device_get_busid(device);
1371         acpi_device_set_id(device);
1372         acpi_bus_get_flags(device);
1373 }
1374
1375 static int acpi_add_single_object(struct acpi_device **child,
1376                                   acpi_handle handle, int type,
1377                                   unsigned long long sta, bool match_driver)
1378 {
1379         int result;
1380         struct acpi_device *device;
1381         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1382
1383         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1384         if (!device) {
1385                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1386                 return -ENOMEM;
1387         }
1388
1389         acpi_init_device_object(device, handle, type, sta);
1390         acpi_bus_get_power_flags(device);
1391         acpi_bus_get_wakeup_device_flags(device);
1392
1393         device->flags.match_driver = match_driver;
1394         result = acpi_device_register(device);
1395         if (result) {
1396                 acpi_device_release(&device->dev);
1397                 return result;
1398         }
1399
1400         acpi_power_add_remove_device(device, true);
1401         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1402         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1403                 dev_name(&device->dev), (char *) buffer.pointer,
1404                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1405         kfree(buffer.pointer);
1406         *child = device;
1407         return 0;
1408 }
1409
1410 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1411                           ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
1412
1413 static void acpi_bus_add_power_resource(acpi_handle handle)
1414 {
1415         struct acpi_device *device = NULL;
1416
1417         acpi_bus_get_device(handle, &device);
1418         if (!device)
1419                 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1420                                         ACPI_STA_DEFAULT, true);
1421 }
1422
1423 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1424                                     unsigned long long *sta)
1425 {
1426         acpi_status status;
1427         acpi_object_type acpi_type;
1428
1429         status = acpi_get_type(handle, &acpi_type);
1430         if (ACPI_FAILURE(status))
1431                 return -ENODEV;
1432
1433         switch (acpi_type) {
1434         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1435         case ACPI_TYPE_DEVICE:
1436                 *type = ACPI_BUS_TYPE_DEVICE;
1437                 status = acpi_bus_get_status_handle(handle, sta);
1438                 if (ACPI_FAILURE(status))
1439                         return -ENODEV;
1440                 break;
1441         case ACPI_TYPE_PROCESSOR:
1442                 *type = ACPI_BUS_TYPE_PROCESSOR;
1443                 status = acpi_bus_get_status_handle(handle, sta);
1444                 if (ACPI_FAILURE(status))
1445                         return -ENODEV;
1446                 break;
1447         case ACPI_TYPE_THERMAL:
1448                 *type = ACPI_BUS_TYPE_THERMAL;
1449                 *sta = ACPI_STA_DEFAULT;
1450                 break;
1451         case ACPI_TYPE_POWER:
1452                 *type = ACPI_BUS_TYPE_POWER;
1453                 *sta = ACPI_STA_DEFAULT;
1454                 break;
1455         default:
1456                 return -ENODEV;
1457         }
1458
1459         return 0;
1460 }
1461
1462 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1463                                       void *not_used, void **return_value)
1464 {
1465         struct acpi_device *device = NULL;
1466         int type;
1467         unsigned long long sta;
1468         acpi_status status;
1469         int result;
1470
1471         acpi_bus_get_device(handle, &device);
1472         if (device)
1473                 goto out;
1474
1475         result = acpi_bus_type_and_status(handle, &type, &sta);
1476         if (result)
1477                 return AE_OK;
1478
1479         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1480             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1481                 struct acpi_device_wakeup wakeup;
1482                 acpi_handle temp;
1483
1484                 status = acpi_get_handle(handle, "_PRW", &temp);
1485                 if (ACPI_SUCCESS(status))
1486                         acpi_bus_extract_wakeup_device_power_package(handle,
1487                                                                      &wakeup);
1488                 return AE_CTRL_DEPTH;
1489         }
1490
1491         acpi_add_single_object(&device, handle, type, sta,
1492                                type == ACPI_BUS_TYPE_POWER);
1493         if (!device)
1494                 return AE_CTRL_DEPTH;
1495
1496         device->flags.match_driver = true;
1497
1498  out:
1499         if (!*return_value)
1500                 *return_value = device;
1501
1502         return AE_OK;
1503 }
1504
1505 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1506                                           void *not_used, void **ret_not_used)
1507 {
1508         acpi_status status = AE_OK;
1509         struct acpi_device *device;
1510         unsigned long long sta_not_used;
1511         int type_not_used;
1512
1513         /*
1514          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1515          * namespace walks prematurely.
1516          */
1517         if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
1518                 return AE_OK;
1519
1520         if (acpi_bus_get_device(handle, &device))
1521                 return AE_CTRL_DEPTH;
1522
1523         if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
1524                 /* This is a known good platform device. */
1525                 acpi_create_platform_device(device);
1526         } else if (device_attach(&device->dev) < 0) {
1527                 status = AE_CTRL_DEPTH;
1528         }
1529         return status;
1530 }
1531
1532 static int acpi_bus_scan(acpi_handle handle)
1533 {
1534         void *device = NULL;
1535
1536         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1537                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1538                                     acpi_bus_check_add, NULL, NULL, &device);
1539
1540         if (!device)
1541                 return -ENODEV;
1542
1543         if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1544                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1545                                     acpi_bus_device_attach, NULL, NULL, NULL);
1546
1547         return 0;
1548 }
1549
1550 /**
1551  * acpi_bus_add - Add ACPI device node objects in a given namespace scope.
1552  * @handle: Root of the namespace scope to scan.
1553  *
1554  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1555  * found devices.
1556  *
1557  * If no devices were found, -ENODEV is returned, but it does not mean that
1558  * there has been a real error.  There just have been no suitable ACPI objects
1559  * in the table trunk from which the kernel could create a device and add an
1560  * appropriate driver.
1561  */
1562 int acpi_bus_add(acpi_handle handle)
1563 {
1564         int err;
1565
1566         err = acpi_bus_scan(handle);
1567         if (err)
1568                 return err;
1569
1570         acpi_update_all_gpes();
1571         return 0;
1572 }
1573 EXPORT_SYMBOL(acpi_bus_add);
1574
1575 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1576                                           void *not_used, void **ret_not_used)
1577 {
1578         struct acpi_device *device = NULL;
1579
1580         if (!acpi_bus_get_device(handle, &device)) {
1581                 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1582                 device_release_driver(&device->dev);
1583         }
1584         return AE_OK;
1585 }
1586
1587 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1588                                    void *not_used, void **ret_not_used)
1589 {
1590         struct acpi_device *device = NULL;
1591
1592         if (!acpi_bus_get_device(handle, &device))
1593                 acpi_device_unregister(device);
1594
1595         return AE_OK;
1596 }
1597
1598 int acpi_bus_trim(struct acpi_device *start)
1599 {
1600         /*
1601          * Execute acpi_bus_device_detach() as a post-order callback to detach
1602          * all ACPI drivers from the device nodes being removed.
1603          */
1604         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1605                             acpi_bus_device_detach, NULL, NULL);
1606         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1607         /*
1608          * Execute acpi_bus_remove() as a post-order callback to remove device
1609          * nodes in the given namespace scope.
1610          */
1611         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1612                             acpi_bus_remove, NULL, NULL);
1613         acpi_bus_remove(start->handle, 0, NULL, NULL);
1614         return 0;
1615 }
1616 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1617
1618 static int acpi_bus_scan_fixed(void)
1619 {
1620         int result = 0;
1621         struct acpi_device *device = NULL;
1622
1623         /*
1624          * Enumerate all fixed-feature devices.
1625          */
1626         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1627                 result = acpi_add_single_object(&device, NULL,
1628                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1629                                                 ACPI_STA_DEFAULT, true);
1630                 device_init_wakeup(&device->dev, true);
1631         }
1632
1633         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1634                 result = acpi_add_single_object(&device, NULL,
1635                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1636                                                 ACPI_STA_DEFAULT, true);
1637         }
1638
1639         return result;
1640 }
1641
1642 int __init acpi_scan_init(void)
1643 {
1644         int result;
1645
1646         result = bus_register(&acpi_bus_type);
1647         if (result) {
1648                 /* We don't want to quit even if we failed to add suspend/resume */
1649                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1650         }
1651
1652         acpi_power_init();
1653         acpi_pci_root_init();
1654
1655         /*
1656          * Enumerate devices in the ACPI namespace.
1657          */
1658         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1659         if (result)
1660                 return result;
1661
1662         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1663         if (!result)
1664                 result = acpi_bus_scan_fixed();
1665
1666         if (result)
1667                 acpi_device_unregister(acpi_root);
1668         else
1669                 acpi_update_all_gpes();
1670
1671         return result;
1672 }