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 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_free_power_resources_lists(struct acpi_device *device)
 479 {
 480         int i;
 481
 482         if (!device->flags.power_manageable)
 483                 return;
 484
 485         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 486                 struct acpi_device_power_state *ps = &device->power.states[i];
 487                 acpi_power_resources_list_free(&ps->resources);
 488         }
 489 }
 490
 491 static void acpi_device_release(struct device *dev)
 492 {
 493         struct acpi_device *acpi_dev = to_acpi_device(dev);
 494
 495         acpi_free_ids(acpi_dev);
 496         acpi_free_power_resources_lists(acpi_dev);
 497         kfree(acpi_dev);
 498 }
 499
 500 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 501 {
 502         struct acpi_device *acpi_dev = to_acpi_device(dev);
 503         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 504
 505         return acpi_dev->flags.match_driver
 506                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 507 }
 508
 509 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 510 {
 511         struct acpi_device *acpi_dev = to_acpi_device(dev);
 512         int len;
 513
 514         if (list_empty(&acpi_dev->pnp.ids))
 515                 return 0;
 516
 517         if (add_uevent_var(env, "MODALIAS="))
 518                 return -ENOMEM;
 519         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 520                               sizeof(env->buf) - env->buflen);
 521         if (len >= (sizeof(env->buf) - env->buflen))
 522                 return -ENOMEM;
 523         env->buflen += len;
 524         return 0;
 525 }
 526
 527 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 528 {
 529         struct acpi_device *device = data;
 530
 531         device->driver->ops.notify(device, event);
 532 }
 533
 534 static acpi_status acpi_device_notify_fixed(void *data)
 535 {
 536         struct acpi_device *device = data;
 537
 538         /* Fixed hardware devices have no handles */
 539         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 540         return AE_OK;
 541 }
 542
 543 static int acpi_device_install_notify_handler(struct acpi_device *device)
 544 {
 545         acpi_status status;
 546
 547         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 548                 status =
 549                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 550                                                      acpi_device_notify_fixed,
 551                                                      device);
 552         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 553                 status =
 554                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 555                                                      acpi_device_notify_fixed,
 556                                                      device);
 557         else
 558                 status = acpi_install_notify_handler(device->handle,
 559                                                      ACPI_DEVICE_NOTIFY,
 560                                                      acpi_device_notify,
 561                                                      device);
 562
 563         if (ACPI_FAILURE(status))
 564                 return -EINVAL;
 565         return 0;
 566 }
 567
 568 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 569 {
 570         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 571                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 572                                                 acpi_device_notify_fixed);
 573         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 574                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 575                                                 acpi_device_notify_fixed);
 576         else
 577                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 578                                            acpi_device_notify);
 579 }
 580
 581 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 582 static int acpi_device_probe(struct device * dev)
 583 {
 584         struct acpi_device *acpi_dev = to_acpi_device(dev);
 585         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 586         int ret;
 587
 588         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 589         if (!ret) {
 590                 if (acpi_drv->ops.notify) {
 591                         ret = acpi_device_install_notify_handler(acpi_dev);
 592                         if (ret) {
 593                                 if (acpi_drv->ops.remove)
 594                                         acpi_drv->ops.remove(acpi_dev,
 595                                                      acpi_dev->removal_type);
 596                                 return ret;
 597                         }
 598                 }
 599
 600                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 601                         "Found driver [%s] for device [%s]\n",
 602                         acpi_drv->name, acpi_dev->pnp.bus_id));
 603                 get_device(dev);
 604         }
 605         return ret;
 606 }
 607
 608 static int acpi_device_remove(struct device * dev)
 609 {
 610         struct acpi_device *acpi_dev = to_acpi_device(dev);
 611         struct acpi_driver *acpi_drv = acpi_dev->driver;
 612
 613         if (acpi_drv) {
 614                 if (acpi_drv->ops.notify)
 615                         acpi_device_remove_notify_handler(acpi_dev);
 616                 if (acpi_drv->ops.remove)
 617                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 618         }
 619         acpi_dev->driver = NULL;
 620         acpi_dev->driver_data = NULL;
 621
 622         put_device(dev);
 623         return 0;
 624 }
 625
 626 struct bus_type acpi_bus_type = {
 627         .name           = "acpi",
 628         .match          = acpi_bus_match,
 629         .probe          = acpi_device_probe,
 630         .remove         = acpi_device_remove,
 631         .uevent         = acpi_device_uevent,
 632 };
 633
 634 int acpi_device_register(struct acpi_device *device,
 635                          void (*release)(struct device *))
 636 {
 637         int result;
 638         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 639         int found = 0;
 640
 641         if (device->handle) {
 642                 acpi_status status;
 643
 644                 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
 645                                           device);
 646                 if (ACPI_FAILURE(status)) {
 647                         acpi_handle_err(device->handle,
 648                                         "Unable to attach device data\n");
 649                         return -ENODEV;
 650                 }
 651         }
 652
 653         /*
 654          * Linkage
 655          * -------
 656          * Link this device to its parent and siblings.
 657          */
 658         INIT_LIST_HEAD(&device->children);
 659         INIT_LIST_HEAD(&device->node);
 660         INIT_LIST_HEAD(&device->wakeup_list);
 661         INIT_LIST_HEAD(&device->physical_node_list);
 662         mutex_init(&device->physical_node_lock);
 663         INIT_LIST_HEAD(&device->power_dependent);
 664
 665         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 666         if (!new_bus_id) {
 667                 pr_err(PREFIX "Memory allocation error\n");
 668                 result = -ENOMEM;
 669                 goto err_detach;
 670         }
 671
 672         mutex_lock(&acpi_device_lock);
 673         /*
 674          * Find suitable bus_id and instance number in acpi_bus_id_list
 675          * If failed, create one and link it into acpi_bus_id_list
 676          */
 677         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 678                 if (!strcmp(acpi_device_bus_id->bus_id,
 679                             acpi_device_hid(device))) {
 680                         acpi_device_bus_id->instance_no++;
 681                         found = 1;
 682                         kfree(new_bus_id);
 683                         break;
 684                 }
 685         }
 686         if (!found) {
 687                 acpi_device_bus_id = new_bus_id;
 688                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 689                 acpi_device_bus_id->instance_no = 0;
 690                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 691         }
 692         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 693
 694         if (device->parent)
 695                 list_add_tail(&device->node, &device->parent->children);
 696
 697         if (device->wakeup.flags.valid)
 698                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 699         mutex_unlock(&acpi_device_lock);
 700
 701         if (device->parent)
 702                 device->dev.parent = &device->parent->dev;
 703         device->dev.bus = &acpi_bus_type;
 704         device->dev.release = release;
 705         result = device_register(&device->dev);
 706         if (result) {
 707                 dev_err(&device->dev, "Error registering device\n");
 708                 goto err;
 709         }
 710
 711         result = acpi_device_setup_files(device);
 712         if (result)
 713                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 714                        dev_name(&device->dev));
 715
 716         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 717         return 0;
 718
 719  err:
 720         mutex_lock(&acpi_device_lock);
 721         if (device->parent)
 722                 list_del(&device->node);
 723         list_del(&device->wakeup_list);
 724         mutex_unlock(&acpi_device_lock);
 725
 726  err_detach:
 727         acpi_detach_data(device->handle, acpi_bus_data_handler);
 728         return result;
 729 }
 730
 731 static void acpi_device_unregister(struct acpi_device *device)
 732 {
 733         mutex_lock(&acpi_device_lock);
 734         if (device->parent)
 735                 list_del(&device->node);
 736
 737         list_del(&device->wakeup_list);
 738         mutex_unlock(&acpi_device_lock);
 739
 740         acpi_detach_data(device->handle, acpi_bus_data_handler);
 741
 742         acpi_power_add_remove_device(device, false);
 743         acpi_device_remove_files(device);
 744         device_unregister(&device->dev);
 745         /*
 746          * Drop the reference counts of all power resources the device depends
 747          * on and turn off the ones that have no more references.
 748          */
 749         acpi_power_transition(device, ACPI_STATE_D3_COLD);
 750 }
 751
 752 /* --------------------------------------------------------------------------
 753                                  Driver Management
 754    -------------------------------------------------------------------------- */
 755 /**
 756  * acpi_bus_driver_init - add a device to a driver
 757  * @device: the device to add and initialize
 758  * @driver: driver for the device
 759  *
 760  * Used to initialize a device via its device driver.  Called whenever a
 761  * driver is bound to a device.  Invokes the driver's add() ops.
 762  */
 763 static int
 764 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 765 {
 766         int result = 0;
 767
 768         if (!device || !driver)
 769                 return -EINVAL;
 770
 771         if (!driver->ops.add)
 772                 return -ENOSYS;
 773
 774         result = driver->ops.add(device);
 775         if (result) {
 776                 device->driver = NULL;
 777                 device->driver_data = NULL;
 778                 return result;
 779         }
 780
 781         device->driver = driver;
 782
 783         /*
 784          * TBD - Configuration Management: Assign resources to device based
 785          * upon possible configuration and currently allocated resources.
 786          */
 787
 788         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 789                           "Driver successfully bound to device\n"));
 790         return 0;
 791 }
 792
 793 /**
 794  * acpi_bus_register_driver - register a driver with the ACPI bus
 795  * @driver: driver being registered
 796  *
 797  * Registers a driver with the ACPI bus.  Searches the namespace for all
 798  * devices that match the driver's criteria and binds.  Returns zero for
 799  * success or a negative error status for failure.
 800  */
 801 int acpi_bus_register_driver(struct acpi_driver *driver)
 802 {
 803         int ret;
 804
 805         if (acpi_disabled)
 806                 return -ENODEV;
 807         driver->drv.name = driver->name;
 808         driver->drv.bus = &acpi_bus_type;
 809         driver->drv.owner = driver->owner;
 810
 811         ret = driver_register(&driver->drv);
 812         return ret;
 813 }
 814
 815 EXPORT_SYMBOL(acpi_bus_register_driver);
 816
 817 /**
 818  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 819  * @driver: driver to unregister
 820  *
 821  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 822  * devices that match the driver's criteria and unbinds.
 823  */
 824 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 825 {
 826         driver_unregister(&driver->drv);
 827 }
 828
 829 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 830
 831 /* --------------------------------------------------------------------------
 832                                  Device Enumeration
 833    -------------------------------------------------------------------------- */
 834 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 835 {
 836         acpi_status status;
 837         int ret;
 838         struct acpi_device *device;
 839
 840         /*
 841          * Fixed hardware devices do not appear in the namespace and do not
 842          * have handles, but we fabricate acpi_devices for them, so we have
 843          * to deal with them specially.
 844          */
 845         if (handle == NULL)
 846                 return acpi_root;
 847
 848         do {
 849                 status = acpi_get_parent(handle, &handle);
 850                 if (status == AE_NULL_ENTRY)
 851                         return NULL;
 852                 if (ACPI_FAILURE(status))
 853                         return acpi_root;
 854
 855                 ret = acpi_bus_get_device(handle, &device);
 856                 if (ret == 0)
 857                         return device;
 858         } while (1);
 859 }
 860
 861 acpi_status
 862 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 863 {
 864         acpi_status status;
 865         acpi_handle tmp;
 866         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 867         union acpi_object *obj;
 868
 869         status = acpi_get_handle(handle, "_EJD", &tmp);
 870         if (ACPI_FAILURE(status))
 871                 return status;
 872
 873         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 874         if (ACPI_SUCCESS(status)) {
 875                 obj = buffer.pointer;
 876                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 877                                          ejd);
 878                 kfree(buffer.pointer);
 879         }
 880         return status;
 881 }
 882 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 883
 884 void acpi_bus_data_handler(acpi_handle handle, void *context)
 885 {
 886
 887         /* TBD */
 888
 889         return;
 890 }
 891
 892 static acpi_status
 893 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 894                                              struct acpi_device_wakeup *wakeup)
 895 {
 896         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 897         union acpi_object *package = NULL;
 898         union acpi_object *element = NULL;
 899         acpi_status status;
 900         int i = 0;
 901
 902         if (!wakeup)
 903                 return AE_BAD_PARAMETER;
 904
 905         /* _PRW */
 906         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 907         if (ACPI_FAILURE(status)) {
 908                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 909                 return status;
 910         }
 911
 912         package = (union acpi_object *)buffer.pointer;
 913
 914         if (!package || (package->package.count < 2)) {
 915                 status = AE_BAD_DATA;
 916                 goto out;
 917         }
 918
 919         element = &(package->package.elements[0]);
 920         if (!element) {
 921                 status = AE_BAD_DATA;
 922                 goto out;
 923         }
 924         if (element->type == ACPI_TYPE_PACKAGE) {
 925                 if ((element->package.count < 2) ||
 926                     (element->package.elements[0].type !=
 927                      ACPI_TYPE_LOCAL_REFERENCE)
 928                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
 929                         status = AE_BAD_DATA;
 930                         goto out;
 931                 }
 932                 wakeup->gpe_device =
 933                     element->package.elements[0].reference.handle;
 934                 wakeup->gpe_number =
 935                     (u32) element->package.elements[1].integer.value;
 936         } else if (element->type == ACPI_TYPE_INTEGER) {
 937                 wakeup->gpe_device = NULL;
 938                 wakeup->gpe_number = element->integer.value;
 939         } else {
 940                 status = AE_BAD_DATA;
 941                 goto out;
 942         }
 943
 944         element = &(package->package.elements[1]);
 945         if (element->type != ACPI_TYPE_INTEGER) {
 946                 status = AE_BAD_DATA;
 947                 goto out;
 948         }
 949         wakeup->sleep_state = element->integer.value;
 950
 951         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 952                 status = AE_NO_MEMORY;
 953                 goto out;
 954         }
 955         wakeup->resources.count = package->package.count - 2;
 956         for (i = 0; i < wakeup->resources.count; i++) {
 957                 element = &(package->package.elements[i + 2]);
 958                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
 959                         status = AE_BAD_DATA;
 960                         goto out;
 961                 }
 962
 963                 wakeup->resources.handles[i] = element->reference.handle;
 964         }
 965
 966         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
 967
 968  out:
 969         kfree(buffer.pointer);
 970
 971         return status;
 972 }
 973
 974 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
 975 {
 976         struct acpi_device_id button_device_ids[] = {
 977                 {"PNP0C0C", 0},
 978                 {"PNP0C0D", 0},
 979                 {"PNP0C0E", 0},
 980                 {"", 0},
 981         };
 982         acpi_status status;
 983         acpi_event_status event_status;
 984
 985         device->wakeup.flags.notifier_present = 0;
 986
 987         /* Power button, Lid switch always enable wakeup */
 988         if (!acpi_match_device_ids(device, button_device_ids)) {
 989                 device->wakeup.flags.run_wake = 1;
 990                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 991                         /* Do not use Lid/sleep button for S5 wakeup */
 992                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
 993                                 device->wakeup.sleep_state = ACPI_STATE_S4;
 994                 }
 995                 device_set_wakeup_capable(&device->dev, true);
 996                 return;
 997         }
 998
 999         status = acpi_get_gpe_status(device->wakeup.gpe_device,
1000                                         device->wakeup.gpe_number,
1001                                                 &event_status);
1002         if (status == AE_OK)
1003                 device->wakeup.flags.run_wake =
1004                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1005 }
1006
1007 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1008 {
1009         acpi_handle temp;
1010         acpi_status status = 0;
1011         int psw_error;
1012
1013         /* Presence of _PRW indicates wake capable */
1014         status = acpi_get_handle(device->handle, "_PRW", &temp);
1015         if (ACPI_FAILURE(status))
1016                 return;
1017
1018         status = acpi_bus_extract_wakeup_device_power_package(device->handle,
1019                                                               &device->wakeup);
1020         if (ACPI_FAILURE(status)) {
1021                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
1022                 return;
1023         }
1024
1025         device->wakeup.flags.valid = 1;
1026         device->wakeup.prepare_count = 0;
1027         acpi_bus_set_run_wake_flags(device);
1028         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1029          * system for the ACPI device with the _PRW object.
1030          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1031          * So it is necessary to call _DSW object first. Only when it is not
1032          * present will the _PSW object used.
1033          */
1034         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
1035         if (psw_error)
1036                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1037                                 "error in _DSW or _PSW evaluation\n"));
1038 }
1039
1040 static void acpi_bus_get_power_flags(struct acpi_device *device)
1041 {
1042         acpi_status status = 0;
1043         acpi_handle handle = NULL;
1044         u32 i = 0;
1045
1046         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1047         status = acpi_get_handle(device->handle, "_PS0", &handle);
1048         if (ACPI_FAILURE(status)) {
1049                 status = acpi_get_handle(device->handle, "_PR0", &handle);
1050                 if (ACPI_FAILURE(status))
1051                         return;
1052         }
1053
1054         device->flags.power_manageable = 1;
1055
1056         /*
1057          * Power Management Flags
1058          */
1059         status = acpi_get_handle(device->handle, "_PSC", &handle);
1060         if (ACPI_SUCCESS(status))
1061                 device->power.flags.explicit_get = 1;
1062         status = acpi_get_handle(device->handle, "_IRC", &handle);
1063         if (ACPI_SUCCESS(status))
1064                 device->power.flags.inrush_current = 1;
1065
1066         /*
1067          * Enumerate supported power management states
1068          */
1069         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1070                 struct acpi_device_power_state *ps = &device->power.states[i];
1071                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
1072                 struct acpi_handle_list resources;
1073
1074                 INIT_LIST_HEAD(&ps->resources);
1075                 /* Evaluate "_PRx" to se if power resources are referenced */
1076                 acpi_evaluate_reference(device->handle, object_name, NULL,
1077                                         &resources);
1078                 if (resources.count) {
1079                         int j;
1080
1081                         device->power.flags.power_resources = 1;
1082                         for (j = 0; j < resources.count; j++) {
1083                                 acpi_handle rhandle = resources.handles[j];
1084
1085                                 acpi_add_power_resource(rhandle);
1086                                 acpi_power_resources_list_add(rhandle,
1087                                                               &ps->resources);
1088                         }
1089                 }
1090
1091                 /* Evaluate "_PSx" to see if we can do explicit sets */
1092                 object_name[2] = 'S';
1093                 status = acpi_get_handle(device->handle, object_name, &handle);
1094                 if (ACPI_SUCCESS(status))
1095                         ps->flags.explicit_set = 1;
1096
1097                 /*
1098                  * State is valid if there are means to put the device into it.
1099                  * D3hot is only valid if _PR3 present.
1100                  */
1101                 if (resources.count ||
1102                     (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
1103                         ps->flags.valid = 1;
1104                         ps->flags.os_accessible = 1;
1105                 }
1106
1107                 ps->power = -1; /* Unknown - driver assigned */
1108                 ps->latency = -1;       /* Unknown - driver assigned */
1109         }
1110
1111         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1112
1113         /* Set defaults for D0 and D3 states (always valid) */
1114         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1115         device->power.states[ACPI_STATE_D0].power = 100;
1116         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1117         device->power.states[ACPI_STATE_D3].power = 0;
1118
1119         /* Set D3cold's explicit_set flag if _PS3 exists. */
1120         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1121                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1122
1123         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1124         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1125                         device->power.flags.power_resources)
1126                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1127
1128         acpi_bus_init_power(device);
1129 }
1130
1131 static void acpi_bus_get_flags(struct acpi_device *device)
1132 {
1133         acpi_status status = AE_OK;
1134         acpi_handle temp = NULL;
1135
1136         /* Presence of _STA indicates 'dynamic_status' */
1137         status = acpi_get_handle(device->handle, "_STA", &temp);
1138         if (ACPI_SUCCESS(status))
1139                 device->flags.dynamic_status = 1;
1140
1141         /* Presence of _RMV indicates 'removable' */
1142         status = acpi_get_handle(device->handle, "_RMV", &temp);
1143         if (ACPI_SUCCESS(status))
1144                 device->flags.removable = 1;
1145
1146         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1147         status = acpi_get_handle(device->handle, "_EJD", &temp);
1148         if (ACPI_SUCCESS(status))
1149                 device->flags.ejectable = 1;
1150         else {
1151                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1152                 if (ACPI_SUCCESS(status))
1153                         device->flags.ejectable = 1;
1154         }
1155 }
1156
1157 static void acpi_device_get_busid(struct acpi_device *device)
1158 {
1159         char bus_id[5] = { '?', 0 };
1160         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1161         int i = 0;
1162
1163         /*
1164          * Bus ID
1165          * ------
1166          * The device's Bus ID is simply the object name.
1167          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1168          */
1169         if (ACPI_IS_ROOT_DEVICE(device)) {
1170                 strcpy(device->pnp.bus_id, "ACPI");
1171                 return;
1172         }
1173
1174         switch (device->device_type) {
1175         case ACPI_BUS_TYPE_POWER_BUTTON:
1176                 strcpy(device->pnp.bus_id, "PWRF");
1177                 break;
1178         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1179                 strcpy(device->pnp.bus_id, "SLPF");
1180                 break;
1181         default:
1182                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1183                 /* Clean up trailing underscores (if any) */
1184                 for (i = 3; i > 1; i--) {
1185                         if (bus_id[i] == '_')
1186                                 bus_id[i] = '\0';
1187                         else
1188                                 break;
1189                 }
1190                 strcpy(device->pnp.bus_id, bus_id);
1191                 break;
1192         }
1193 }
1194
1195 /*
1196  * acpi_bay_match - see if a device is an ejectable driver bay
1197  *
1198  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1199  * then we can safely call it an ejectable drive bay
1200  */
1201 static int acpi_bay_match(struct acpi_device *device){
1202         acpi_status status;
1203         acpi_handle handle;
1204         acpi_handle tmp;
1205         acpi_handle phandle;
1206
1207         handle = device->handle;
1208
1209         status = acpi_get_handle(handle, "_EJ0", &tmp);
1210         if (ACPI_FAILURE(status))
1211                 return -ENODEV;
1212
1213         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1214                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1215                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1216                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1217                 return 0;
1218
1219         if (acpi_get_parent(handle, &phandle))
1220                 return -ENODEV;
1221
1222         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1223                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1224                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1225                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1226                 return 0;
1227
1228         return -ENODEV;
1229 }
1230
1231 /*
1232  * acpi_dock_match - see if a device has a _DCK method
1233  */
1234 static int acpi_dock_match(struct acpi_device *device)
1235 {
1236         acpi_handle tmp;
1237         return acpi_get_handle(device->handle, "_DCK", &tmp);
1238 }
1239
1240 const char *acpi_device_hid(struct acpi_device *device)
1241 {
1242         struct acpi_hardware_id *hid;
1243
1244         if (list_empty(&device->pnp.ids))
1245                 return dummy_hid;
1246
1247         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1248         return hid->id;
1249 }
1250 EXPORT_SYMBOL(acpi_device_hid);
1251
1252 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1253 {
1254         struct acpi_hardware_id *id;
1255
1256         id = kmalloc(sizeof(*id), GFP_KERNEL);
1257         if (!id)
1258                 return;
1259
1260         id->id = kstrdup(dev_id, GFP_KERNEL);
1261         if (!id->id) {
1262                 kfree(id);
1263                 return;
1264         }
1265
1266         list_add_tail(&id->list, &device->pnp.ids);
1267 }
1268
1269 /*
1270  * Old IBM workstations have a DSDT bug wherein the SMBus object
1271  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1272  * prefix.  Work around this.
1273  */
1274 static int acpi_ibm_smbus_match(struct acpi_device *device)
1275 {
1276         acpi_handle h_dummy;
1277         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1278         int result;
1279
1280         if (!dmi_name_in_vendors("IBM"))
1281                 return -ENODEV;
1282
1283         /* Look for SMBS object */
1284         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1285         if (result)
1286                 return result;
1287
1288         if (strcmp("SMBS", path.pointer)) {
1289                 result = -ENODEV;
1290                 goto out;
1291         }
1292
1293         /* Does it have the necessary (but misnamed) methods? */
1294         result = -ENODEV;
1295         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1296             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1297             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1298                 result = 0;
1299 out:
1300         kfree(path.pointer);
1301         return result;
1302 }
1303
1304 static void acpi_device_set_id(struct acpi_device *device)
1305 {
1306         acpi_status status;
1307         struct acpi_device_info *info;
1308         struct acpi_pnp_device_id_list *cid_list;
1309         int i;
1310
1311         switch (device->device_type) {
1312         case ACPI_BUS_TYPE_DEVICE:
1313                 if (ACPI_IS_ROOT_DEVICE(device)) {
1314                         acpi_add_id(device, ACPI_SYSTEM_HID);
1315                         break;
1316                 }
1317
1318                 status = acpi_get_object_info(device->handle, &info);
1319                 if (ACPI_FAILURE(status)) {
1320                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1321                         return;
1322                 }
1323
1324                 if (info->valid & ACPI_VALID_HID)
1325                         acpi_add_id(device, info->hardware_id.string);
1326                 if (info->valid & ACPI_VALID_CID) {
1327                         cid_list = &info->compatible_id_list;
1328                         for (i = 0; i < cid_list->count; i++)
1329                                 acpi_add_id(device, cid_list->ids[i].string);
1330                 }
1331                 if (info->valid & ACPI_VALID_ADR) {
1332                         device->pnp.bus_address = info->address;
1333                         device->flags.bus_address = 1;
1334                 }
1335                 if (info->valid & ACPI_VALID_UID)
1336                         device->pnp.unique_id = kstrdup(info->unique_id.string,
1337                                                         GFP_KERNEL);
1338
1339                 kfree(info);
1340
1341                 /*
1342                  * Some devices don't reliably have _HIDs & _CIDs, so add
1343                  * synthetic HIDs to make sure drivers can find them.
1344                  */
1345                 if (acpi_is_video_device(device))
1346                         acpi_add_id(device, ACPI_VIDEO_HID);
1347                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1348                         acpi_add_id(device, ACPI_BAY_HID);
1349                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1350                         acpi_add_id(device, ACPI_DOCK_HID);
1351                 else if (!acpi_ibm_smbus_match(device))
1352                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1353                 else if (list_empty(&device->pnp.ids) &&
1354                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1355                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1356                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1357                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1358                 }
1359
1360                 break;
1361         case ACPI_BUS_TYPE_POWER:
1362                 acpi_add_id(device, ACPI_POWER_HID);
1363                 break;
1364         case ACPI_BUS_TYPE_PROCESSOR:
1365                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1366                 break;
1367         case ACPI_BUS_TYPE_THERMAL:
1368                 acpi_add_id(device, ACPI_THERMAL_HID);
1369                 break;
1370         case ACPI_BUS_TYPE_POWER_BUTTON:
1371                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1372                 break;
1373         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1374                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1375                 break;
1376         }
1377 }
1378
1379 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1380                              int type, unsigned long long sta)
1381 {
1382         INIT_LIST_HEAD(&device->pnp.ids);
1383         device->device_type = type;
1384         device->handle = handle;
1385         device->parent = acpi_bus_get_parent(handle);
1386         STRUCT_TO_INT(device->status) = sta;
1387         acpi_device_get_busid(device);
1388         acpi_device_set_id(device);
1389         acpi_bus_get_flags(device);
1390 }
1391
1392 static int acpi_add_single_object(struct acpi_device **child,
1393                                   acpi_handle handle, int type,
1394                                   unsigned long long sta, bool match_driver)
1395 {
1396         int result;
1397         struct acpi_device *device;
1398         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1399
1400         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1401         if (!device) {
1402                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1403                 return -ENOMEM;
1404         }
1405
1406         acpi_init_device_object(device, handle, type, sta);
1407         acpi_bus_get_power_flags(device);
1408         acpi_bus_get_wakeup_device_flags(device);
1409
1410         device->flags.match_driver = match_driver;
1411         result = acpi_device_register(device, acpi_device_release);
1412         if (result) {
1413                 acpi_device_release(&device->dev);
1414                 return result;
1415         }
1416
1417         acpi_power_add_remove_device(device, true);
1418         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1419         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1420                 dev_name(&device->dev), (char *) buffer.pointer,
1421                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1422         kfree(buffer.pointer);
1423         *child = device;
1424         return 0;
1425 }
1426
1427 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1428                                     unsigned long long *sta)
1429 {
1430         acpi_status status;
1431         acpi_object_type acpi_type;
1432
1433         status = acpi_get_type(handle, &acpi_type);
1434         if (ACPI_FAILURE(status))
1435                 return -ENODEV;
1436
1437         switch (acpi_type) {
1438         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1439         case ACPI_TYPE_DEVICE:
1440                 *type = ACPI_BUS_TYPE_DEVICE;
1441                 status = acpi_bus_get_status_handle(handle, sta);
1442                 if (ACPI_FAILURE(status))
1443                         return -ENODEV;
1444                 break;
1445         case ACPI_TYPE_PROCESSOR:
1446                 *type = ACPI_BUS_TYPE_PROCESSOR;
1447                 status = acpi_bus_get_status_handle(handle, sta);
1448                 if (ACPI_FAILURE(status))
1449                         return -ENODEV;
1450                 break;
1451         case ACPI_TYPE_THERMAL:
1452                 *type = ACPI_BUS_TYPE_THERMAL;
1453                 *sta = ACPI_STA_DEFAULT;
1454                 break;
1455         case ACPI_TYPE_POWER:
1456                 *type = ACPI_BUS_TYPE_POWER;
1457                 *sta = ACPI_STA_DEFAULT;
1458                 break;
1459         default:
1460                 return -ENODEV;
1461         }
1462
1463         return 0;
1464 }
1465
1466 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1467                                       void *not_used, void **return_value)
1468 {
1469         struct acpi_device *device = NULL;
1470         int type;
1471         unsigned long long sta;
1472         acpi_status status;
1473         int result;
1474
1475         acpi_bus_get_device(handle, &device);
1476         if (device)
1477                 goto out;
1478
1479         result = acpi_bus_type_and_status(handle, &type, &sta);
1480         if (result)
1481                 return AE_OK;
1482
1483         if (type == ACPI_BUS_TYPE_POWER) {
1484                 acpi_add_power_resource(handle);
1485                 return AE_OK;
1486         }
1487
1488         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1489             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1490                 struct acpi_device_wakeup wakeup;
1491                 acpi_handle temp;
1492
1493                 status = acpi_get_handle(handle, "_PRW", &temp);
1494                 if (ACPI_SUCCESS(status))
1495                         acpi_bus_extract_wakeup_device_power_package(handle,
1496                                                                      &wakeup);
1497                 return AE_CTRL_DEPTH;
1498         }
1499
1500         acpi_add_single_object(&device, handle, type, sta, false);
1501         if (!device)
1502                 return AE_CTRL_DEPTH;
1503
1504         device->flags.match_driver = true;
1505
1506  out:
1507         if (!*return_value)
1508                 *return_value = device;
1509
1510         return AE_OK;
1511 }
1512
1513 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1514                                           void *not_used, void **ret_not_used)
1515 {
1516         acpi_status status = AE_OK;
1517         struct acpi_device *device;
1518         unsigned long long sta_not_used;
1519         int type_not_used;
1520
1521         /*
1522          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1523          * namespace walks prematurely.
1524          */
1525         if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
1526                 return AE_OK;
1527
1528         if (acpi_bus_get_device(handle, &device))
1529                 return AE_CTRL_DEPTH;
1530
1531         if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
1532                 /* This is a known good platform device. */
1533                 acpi_create_platform_device(device);
1534         } else if (device_attach(&device->dev) < 0) {
1535                 status = AE_CTRL_DEPTH;
1536         }
1537         return status;
1538 }
1539
1540 static int acpi_bus_scan(acpi_handle handle)
1541 {
1542         void *device = NULL;
1543
1544         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1545                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1546                                     acpi_bus_check_add, NULL, NULL, &device);
1547
1548         if (!device)
1549                 return -ENODEV;
1550
1551         if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1552                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1553                                     acpi_bus_device_attach, NULL, NULL, NULL);
1554
1555         return 0;
1556 }
1557
1558 /**
1559  * acpi_bus_add - Add ACPI device node objects in a given namespace scope.
1560  * @handle: Root of the namespace scope to scan.
1561  *
1562  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1563  * found devices.
1564  *
1565  * If no devices were found, -ENODEV is returned, but it does not mean that
1566  * there has been a real error.  There just have been no suitable ACPI objects
1567  * in the table trunk from which the kernel could create a device and add an
1568  * appropriate driver.
1569  */
1570 int acpi_bus_add(acpi_handle handle)
1571 {
1572         int err;
1573
1574         err = acpi_bus_scan(handle);
1575         if (err)
1576                 return err;
1577
1578         acpi_update_all_gpes();
1579         return 0;
1580 }
1581 EXPORT_SYMBOL(acpi_bus_add);
1582
1583 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1584                                           void *not_used, void **ret_not_used)
1585 {
1586         struct acpi_device *device = NULL;
1587
1588         if (!acpi_bus_get_device(handle, &device)) {
1589                 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1590                 device_release_driver(&device->dev);
1591         }
1592         return AE_OK;
1593 }
1594
1595 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1596                                    void *not_used, void **ret_not_used)
1597 {
1598         struct acpi_device *device = NULL;
1599
1600         if (!acpi_bus_get_device(handle, &device))
1601                 acpi_device_unregister(device);
1602
1603         return AE_OK;
1604 }
1605
1606 int acpi_bus_trim(struct acpi_device *start)
1607 {
1608         /*
1609          * Execute acpi_bus_device_detach() as a post-order callback to detach
1610          * all ACPI drivers from the device nodes being removed.
1611          */
1612         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1613                             acpi_bus_device_detach, NULL, NULL);
1614         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1615         /*
1616          * Execute acpi_bus_remove() as a post-order callback to remove device
1617          * nodes in the given namespace scope.
1618          */
1619         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1620                             acpi_bus_remove, NULL, NULL);
1621         acpi_bus_remove(start->handle, 0, NULL, NULL);
1622         return 0;
1623 }
1624 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1625
1626 static int acpi_bus_scan_fixed(void)
1627 {
1628         int result = 0;
1629         struct acpi_device *device = NULL;
1630
1631         /*
1632          * Enumerate all fixed-feature devices.
1633          */
1634         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1635                 result = acpi_add_single_object(&device, NULL,
1636                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1637                                                 ACPI_STA_DEFAULT, true);
1638                 device_init_wakeup(&device->dev, true);
1639         }
1640
1641         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1642                 result = acpi_add_single_object(&device, NULL,
1643                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1644                                                 ACPI_STA_DEFAULT, true);
1645         }
1646
1647         return result;
1648 }
1649
1650 int __init acpi_scan_init(void)
1651 {
1652         int result;
1653
1654         result = bus_register(&acpi_bus_type);
1655         if (result) {
1656                 /* We don't want to quit even if we failed to add suspend/resume */
1657                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1658         }
1659
1660         acpi_pci_root_init();
1661
1662         /*
1663          * Enumerate devices in the ACPI namespace.
1664          */
1665         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1666         if (result)
1667                 return result;
1668
1669         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1670         if (!result)
1671                 result = acpi_bus_scan_fixed();
1672
1673         if (result)
1674                 acpi_device_unregister(acpi_root);
1675         else
1676                 acpi_update_all_gpes();
1677
1678         return result;
1679 }