git.oblomov.eu Git - linux-2.6/blob - 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/kernel.h>
   8 #include <linux/acpi.h>
   9
  10 #include <acpi/acpi_drivers.h>
  11 #include <acpi/acinterp.h>      /* for acpi_ex_eisa_id_to_string() */
  12
  13 #define _COMPONENT              ACPI_BUS_COMPONENT
  14 ACPI_MODULE_NAME("scan")
  15 #define STRUCT_TO_INT(s)        (*((int*)&s))
  16 extern struct acpi_device *acpi_root;
  17
  18 #define ACPI_BUS_CLASS                  "system_bus"
  19 #define ACPI_BUS_HID                    "ACPI_BUS"
  20 #define ACPI_BUS_DRIVER_NAME            "ACPI Bus Driver"
  21 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  22
  23 static LIST_HEAD(acpi_device_list);
  24 DEFINE_SPINLOCK(acpi_device_lock);
  25 LIST_HEAD(acpi_wakeup_device_list);
  26
  27
  28 static void acpi_device_release(struct kobject *kobj)
  29 {
  30         struct acpi_device *dev = container_of(kobj, struct acpi_device, kobj);
  31         kfree(dev->pnp.cid_list);
  32         kfree(dev);
  33 }
  34
  35 struct acpi_device_attribute {
  36         struct attribute attr;
  37          ssize_t(*show) (struct acpi_device *, char *);
  38          ssize_t(*store) (struct acpi_device *, const char *, size_t);
  39 };
  40
  41 typedef void acpi_device_sysfs_files(struct kobject *,
  42                                      const struct attribute *);
  43
  44 static void setup_sys_fs_device_files(struct acpi_device *dev,
  45                                       acpi_device_sysfs_files * func);
  46
  47 #define create_sysfs_device_files(dev)  \
  48         setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file)
  49 #define remove_sysfs_device_files(dev)  \
  50         setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file)
  51
  52 #define to_acpi_dev(n) container_of(n, struct acpi_device, kobj)
  53 #define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr);
  54
  55 static ssize_t acpi_device_attr_show(struct kobject *kobj,
  56                                      struct attribute *attr, char *buf)
  57 {
  58         struct acpi_device *device = to_acpi_dev(kobj);
  59         struct acpi_device_attribute *attribute = to_handle_attr(attr);
  60         return attribute->show ? attribute->show(device, buf) : -EIO;
  61 }
  62 static ssize_t acpi_device_attr_store(struct kobject *kobj,
  63                                       struct attribute *attr, const char *buf,
  64                                       size_t len)
  65 {
  66         struct acpi_device *device = to_acpi_dev(kobj);
  67         struct acpi_device_attribute *attribute = to_handle_attr(attr);
  68         return attribute->store ? attribute->store(device, buf, len) : -EIO;
  69 }
  70
  71 static struct sysfs_ops acpi_device_sysfs_ops = {
  72         .show = acpi_device_attr_show,
  73         .store = acpi_device_attr_store,
  74 };
  75
  76 static struct kobj_type ktype_acpi_ns = {
  77         .sysfs_ops = &acpi_device_sysfs_ops,
  78         .release = acpi_device_release,
  79 };
  80
  81 static int namespace_uevent(struct kset *kset, struct kobject *kobj,
  82                              char **envp, int num_envp, char *buffer,
  83                              int buffer_size)
  84 {
  85         struct acpi_device *dev = to_acpi_dev(kobj);
  86         int i = 0;
  87         int len = 0;
  88
  89         if (!dev->driver)
  90                 return 0;
  91
  92         if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
  93                            "PHYSDEVDRIVER=%s", dev->driver->name))
  94                 return -ENOMEM;
  95
  96         envp[i] = NULL;
  97
  98         return 0;
  99 }
 100
 101 static struct kset_uevent_ops namespace_uevent_ops = {
 102         .uevent = &namespace_uevent,
 103 };
 104
 105 static struct kset acpi_namespace_kset = {
 106         .kobj = {
 107                  .name = "namespace",
 108                  },
 109         .subsys = &acpi_subsys,
 110         .ktype = &ktype_acpi_ns,
 111         .uevent_ops = &namespace_uevent_ops,
 112 };
 113
 114 /* --------------------------------------------------------------------------
 115                 ACPI sysfs device file support
 116    -------------------------------------------------------------------------- */
 117 static ssize_t acpi_eject_store(struct acpi_device *device,
 118                                 const char *buf, size_t count);
 119
 120 #define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
 121 static struct acpi_device_attribute acpi_device_attr_##_name = \
 122                 __ATTR(_name, _mode, _show, _store)
 123
 124 ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 125
 126 /**
 127  * setup_sys_fs_device_files - sets up the device files under device namespace
 128  * @dev:        acpi_device object
 129  * @func:       function pointer to create or destroy the device file
 130  */
 131 static void
 132 setup_sys_fs_device_files(struct acpi_device *dev,
 133                           acpi_device_sysfs_files * func)
 134 {
 135         acpi_status status;
 136         acpi_handle temp = NULL;
 137
 138         /*
 139          * If device has _EJ0, 'eject' file is created that is used to trigger
 140          * hot-removal function from userland.
 141          */
 142         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 143         if (ACPI_SUCCESS(status))
 144                 (*(func)) (&dev->kobj, &acpi_device_attr_eject.attr);
 145 }
 146
 147 static int acpi_eject_operation(acpi_handle handle, int lockable)
 148 {
 149         struct acpi_object_list arg_list;
 150         union acpi_object arg;
 151         acpi_status status = AE_OK;
 152
 153         /*
 154          * TBD: evaluate _PS3?
 155          */
 156
 157         if (lockable) {
 158                 arg_list.count = 1;
 159                 arg_list.pointer = &arg;
 160                 arg.type = ACPI_TYPE_INTEGER;
 161                 arg.integer.value = 0;
 162                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 163         }
 164
 165         arg_list.count = 1;
 166         arg_list.pointer = &arg;
 167         arg.type = ACPI_TYPE_INTEGER;
 168         arg.integer.value = 1;
 169
 170         /*
 171          * TBD: _EJD support.
 172          */
 173
 174         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 175         if (ACPI_FAILURE(status)) {
 176                 return (-ENODEV);
 177         }
 178
 179         return (0);
 180 }
 181
 182 static ssize_t
 183 acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
 184 {
 185         int result;
 186         int ret = count;
 187         int islockable;
 188         acpi_status status;
 189         acpi_handle handle;
 190         acpi_object_type type = 0;
 191
 192         if ((!count) || (buf[0] != '1')) {
 193                 return -EINVAL;
 194         }
 195 #ifndef FORCE_EJECT
 196         if (device->driver == NULL) {
 197                 ret = -ENODEV;
 198                 goto err;
 199         }
 200 #endif
 201         status = acpi_get_type(device->handle, &type);
 202         if (ACPI_FAILURE(status) || (!device->flags.ejectable)) {
 203                 ret = -ENODEV;
 204                 goto err;
 205         }
 206
 207         islockable = device->flags.lockable;
 208         handle = device->handle;
 209
 210         result = acpi_bus_trim(device, 1);
 211
 212         if (!result)
 213                 result = acpi_eject_operation(handle, islockable);
 214
 215         if (result) {
 216                 ret = -EBUSY;
 217         }
 218       err:
 219         return ret;
 220 }
 221
 222 /* --------------------------------------------------------------------------
 223                         ACPI Bus operations
 224    -------------------------------------------------------------------------- */
 225 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 226 {
 227         struct acpi_device *acpi_dev = to_acpi_device(dev);
 228         struct acpi_driver *acpi_drv = acpi_dev->driver;
 229
 230         if (acpi_drv && acpi_drv->ops.suspend)
 231                 return acpi_drv->ops.suspend(acpi_dev, state);
 232         return 0;
 233 }
 234
 235 static int acpi_device_resume(struct device *dev)
 236 {
 237         struct acpi_device *acpi_dev = to_acpi_device(dev);
 238         struct acpi_driver *acpi_drv = acpi_dev->driver;
 239
 240         if (acpi_drv && acpi_drv->ops.resume)
 241                 return acpi_drv->ops.resume(acpi_dev);
 242         return 0;
 243 }
 244
 245 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 246 {
 247         struct acpi_device *acpi_dev = to_acpi_device(dev);
 248         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 249
 250         if (acpi_drv->ops.match)
 251                 return !acpi_drv->ops.match(acpi_dev, acpi_drv);
 252         return !acpi_match_ids(acpi_dev, acpi_drv->ids);
 253 }
 254
 255 static int acpi_device_uevent(struct device *dev, char **envp, int num_envp,
 256         char *buffer, int buffer_size)
 257 {
 258         struct acpi_device *acpi_dev = to_acpi_device(dev);
 259         int i = 0, length = 0, ret = 0;
 260
 261         if (acpi_dev->flags.hardware_id)
 262                 ret = add_uevent_var(envp, num_envp, &i,
 263                         buffer, buffer_size, &length,
 264                         "HWID=%s", acpi_dev->pnp.hardware_id);
 265         if (ret)
 266                 return -ENOMEM;
 267         if (acpi_dev->flags.compatible_ids) {
 268                 int j;
 269                 struct acpi_compatible_id_list *cid_list;
 270
 271                 cid_list = acpi_dev->pnp.cid_list;
 272
 273                 for (j = 0; j < cid_list->count; j++) {
 274                         ret = add_uevent_var(envp, num_envp, &i, buffer,
 275                                 buffer_size, &length, "COMPTID=%s",
 276                                 cid_list->id[j].value);
 277                         if (ret)
 278                                 return -ENOMEM;
 279                 }
 280         }
 281
 282         envp[i] = NULL;
 283         return 0;
 284 }
 285
 286 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 287 static int acpi_start_single_object(struct acpi_device *);
 288 static int acpi_device_probe(struct device * dev)
 289 {
 290         struct acpi_device *acpi_dev = to_acpi_device(dev);
 291         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 292         int ret;
 293
 294         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 295         if (!ret) {
 296                 acpi_start_single_object(acpi_dev);
 297                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 298                         "Found driver [%s] for device [%s]\n",
 299                         acpi_drv->name, acpi_dev->pnp.bus_id));
 300                 get_device(dev);
 301         }
 302         return ret;
 303 }
 304
 305 static int acpi_device_remove(struct device * dev)
 306 {
 307         struct acpi_device *acpi_dev = to_acpi_device(dev);
 308         struct acpi_driver *acpi_drv = acpi_dev->driver;
 309
 310         if (acpi_drv) {
 311                 if (acpi_drv->ops.stop)
 312                         acpi_drv->ops.stop(acpi_dev, ACPI_BUS_REMOVAL_NORMAL);
 313                 if (acpi_drv->ops.remove)
 314                         acpi_drv->ops.remove(acpi_dev, ACPI_BUS_REMOVAL_NORMAL);
 315         }
 316         acpi_dev->driver = NULL;
 317         acpi_driver_data(dev) = NULL;
 318
 319         put_device(dev);
 320         return 0;
 321 }
 322
 323 static void acpi_device_shutdown(struct device *dev)
 324 {
 325         struct acpi_device *acpi_dev = to_acpi_device(dev);
 326         struct acpi_driver *acpi_drv = acpi_dev->driver;
 327
 328         if (acpi_drv && acpi_drv->ops.shutdown)
 329                 acpi_drv->ops.shutdown(acpi_dev);
 330
 331         return ;
 332 }
 333
 334 static struct bus_type acpi_bus_type = {
 335         .name           = "acpi",
 336         .suspend        = acpi_device_suspend,
 337         .resume         = acpi_device_resume,
 338         .shutdown       = acpi_device_shutdown,
 339         .match          = acpi_bus_match,
 340         .probe          = acpi_device_probe,
 341         .remove         = acpi_device_remove,
 342         .uevent         = acpi_device_uevent,
 343 };
 344
 345 static void acpi_device_register(struct acpi_device *device,
 346                                  struct acpi_device *parent)
 347 {
 348         int err;
 349
 350         /*
 351          * Linkage
 352          * -------
 353          * Link this device to its parent and siblings.
 354          */
 355         INIT_LIST_HEAD(&device->children);
 356         INIT_LIST_HEAD(&device->node);
 357         INIT_LIST_HEAD(&device->g_list);
 358         INIT_LIST_HEAD(&device->wakeup_list);
 359
 360         spin_lock(&acpi_device_lock);
 361         if (device->parent) {
 362                 list_add_tail(&device->node, &device->parent->children);
 363                 list_add_tail(&device->g_list, &device->parent->g_list);
 364         } else
 365                 list_add_tail(&device->g_list, &acpi_device_list);
 366         if (device->wakeup.flags.valid)
 367                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 368         spin_unlock(&acpi_device_lock);
 369
 370         strlcpy(device->kobj.name, device->pnp.bus_id, KOBJ_NAME_LEN);
 371         if (parent)
 372                 device->kobj.parent = &parent->kobj;
 373         device->kobj.ktype = &ktype_acpi_ns;
 374         device->kobj.kset = &acpi_namespace_kset;
 375         err = kobject_register(&device->kobj);
 376         if (err < 0)
 377                 printk(KERN_WARNING "%s: kobject_register error: %d\n",
 378                         __FUNCTION__, err);
 379         create_sysfs_device_files(device);
 380 }
 381
 382 static void acpi_device_unregister(struct acpi_device *device, int type)
 383 {
 384         spin_lock(&acpi_device_lock);
 385         if (device->parent) {
 386                 list_del(&device->node);
 387                 list_del(&device->g_list);
 388         } else
 389                 list_del(&device->g_list);
 390
 391         list_del(&device->wakeup_list);
 392
 393         spin_unlock(&acpi_device_lock);
 394
 395         acpi_detach_data(device->handle, acpi_bus_data_handler);
 396         remove_sysfs_device_files(device);
 397         kobject_unregister(&device->kobj);
 398 }
 399
 400 /* --------------------------------------------------------------------------
 401                                  Driver Management
 402    -------------------------------------------------------------------------- */
 403 static LIST_HEAD(acpi_bus_drivers);
 404
 405 /**
 406  * acpi_bus_driver_init - add a device to a driver
 407  * @device: the device to add and initialize
 408  * @driver: driver for the device
 409  *
 410  * Used to initialize a device via its device driver.  Called whenever a
 411  * driver is bound to a device.  Invokes the driver's add() and start() ops.
 412  */
 413 static int
 414 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 415 {
 416         int result = 0;
 417
 418
 419         if (!device || !driver)
 420                 return -EINVAL;
 421
 422         if (!driver->ops.add)
 423                 return -ENOSYS;
 424
 425         result = driver->ops.add(device);
 426         if (result) {
 427                 device->driver = NULL;
 428                 acpi_driver_data(device) = NULL;
 429                 return result;
 430         }
 431
 432         device->driver = driver;
 433
 434         /*
 435          * TBD - Configuration Management: Assign resources to device based
 436          * upon possible configuration and currently allocated resources.
 437          */
 438
 439         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 440                           "Driver successfully bound to device\n"));
 441         return 0;
 442 }
 443
 444 static int acpi_start_single_object(struct acpi_device *device)
 445 {
 446         int result = 0;
 447         struct acpi_driver *driver;
 448
 449
 450         if (!(driver = device->driver))
 451                 return 0;
 452
 453         if (driver->ops.start) {
 454                 result = driver->ops.start(device);
 455                 if (result && driver->ops.remove)
 456                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 457         }
 458
 459         return result;
 460 }
 461
 462 static void acpi_driver_attach(struct acpi_driver *drv)
 463 {
 464         struct list_head *node, *next;
 465
 466
 467         spin_lock(&acpi_device_lock);
 468         list_for_each_safe(node, next, &acpi_device_list) {
 469                 struct acpi_device *dev =
 470                     container_of(node, struct acpi_device, g_list);
 471
 472                 if (dev->driver || !dev->status.present)
 473                         continue;
 474                 spin_unlock(&acpi_device_lock);
 475
 476                 if (!acpi_bus_match(&(dev->dev), &(drv->drv))) {
 477                         if (!acpi_bus_driver_init(dev, drv)) {
 478                                 acpi_start_single_object(dev);
 479                                 atomic_inc(&drv->references);
 480                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 481                                                   "Found driver [%s] for device [%s]\n",
 482                                                   drv->name, dev->pnp.bus_id));
 483                         }
 484                 }
 485                 spin_lock(&acpi_device_lock);
 486         }
 487         spin_unlock(&acpi_device_lock);
 488 }
 489
 490 static void acpi_driver_detach(struct acpi_driver *drv)
 491 {
 492         struct list_head *node, *next;
 493
 494
 495         spin_lock(&acpi_device_lock);
 496         list_for_each_safe(node, next, &acpi_device_list) {
 497                 struct acpi_device *dev =
 498                     container_of(node, struct acpi_device, g_list);
 499
 500                 if (dev->driver == drv) {
 501                         spin_unlock(&acpi_device_lock);
 502                         if (drv->ops.remove)
 503                                 drv->ops.remove(dev, ACPI_BUS_REMOVAL_NORMAL);
 504                         spin_lock(&acpi_device_lock);
 505                         dev->driver = NULL;
 506                         dev->driver_data = NULL;
 507                         atomic_dec(&drv->references);
 508                 }
 509         }
 510         spin_unlock(&acpi_device_lock);
 511 }
 512
 513 /**
 514  * acpi_bus_register_driver - register a driver with the ACPI bus
 515  * @driver: driver being registered
 516  *
 517  * Registers a driver with the ACPI bus.  Searches the namespace for all
 518  * devices that match the driver's criteria and binds.  Returns zero for
 519  * success or a negative error status for failure.
 520  */
 521 int acpi_bus_register_driver(struct acpi_driver *driver)
 522 {
 523
 524         if (acpi_disabled)
 525                 return -ENODEV;
 526
 527         spin_lock(&acpi_device_lock);
 528         list_add_tail(&driver->node, &acpi_bus_drivers);
 529         spin_unlock(&acpi_device_lock);
 530         acpi_driver_attach(driver);
 531
 532         return 0;
 533 }
 534
 535 EXPORT_SYMBOL(acpi_bus_register_driver);
 536
 537 /**
 538  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 539  * @driver: driver to unregister
 540  *
 541  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 542  * devices that match the driver's criteria and unbinds.
 543  */
 544 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 545 {
 546         acpi_driver_detach(driver);
 547
 548         if (!atomic_read(&driver->references)) {
 549                 spin_lock(&acpi_device_lock);
 550                 list_del_init(&driver->node);
 551                 spin_unlock(&acpi_device_lock);
 552         }
 553         return;
 554 }
 555
 556 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 557
 558 /**
 559  * acpi_bus_find_driver - check if there is a driver installed for the device
 560  * @device: device that we are trying to find a supporting driver for
 561  *
 562  * Parses the list of registered drivers looking for a driver applicable for
 563  * the specified device.
 564  */
 565 static int acpi_bus_find_driver(struct acpi_device *device)
 566 {
 567         int result = 0;
 568         struct list_head *node, *next;
 569
 570
 571         spin_lock(&acpi_device_lock);
 572         list_for_each_safe(node, next, &acpi_bus_drivers) {
 573                 struct acpi_driver *driver =
 574                     container_of(node, struct acpi_driver, node);
 575
 576                 atomic_inc(&driver->references);
 577                 spin_unlock(&acpi_device_lock);
 578                 if (!acpi_bus_match(&(device->dev), &(driver->drv))) {
 579                         result = acpi_bus_driver_init(device, driver);
 580                         if (!result)
 581                                 goto Done;
 582                 }
 583                 atomic_dec(&driver->references);
 584                 spin_lock(&acpi_device_lock);
 585         }
 586         spin_unlock(&acpi_device_lock);
 587
 588       Done:
 589         return result;
 590 }
 591
 592 /* --------------------------------------------------------------------------
 593                                  Device Enumeration
 594    -------------------------------------------------------------------------- */
 595 acpi_status
 596 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 597 {
 598         acpi_status status;
 599         acpi_handle tmp;
 600         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 601         union acpi_object *obj;
 602
 603         status = acpi_get_handle(handle, "_EJD", &tmp);
 604         if (ACPI_FAILURE(status))
 605                 return status;
 606
 607         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 608         if (ACPI_SUCCESS(status)) {
 609                 obj = buffer.pointer;
 610                 status = acpi_get_handle(NULL, obj->string.pointer, ejd);
 611                 kfree(buffer.pointer);
 612         }
 613         return status;
 614 }
 615 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 616
 617 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 618 {
 619
 620         /* TBD */
 621
 622         return;
 623 }
 624
 625 int acpi_match_ids(struct acpi_device *device, char *ids)
 626 {
 627         if (device->flags.hardware_id)
 628                 if (strstr(ids, device->pnp.hardware_id))
 629                         return 0;
 630
 631         if (device->flags.compatible_ids) {
 632                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 633                 int i;
 634
 635                 /* compare multiple _CID entries against driver ids */
 636                 for (i = 0; i < cid_list->count; i++) {
 637                         if (strstr(ids, cid_list->id[i].value))
 638                                 return 0;
 639                 }
 640         }
 641         return -ENOENT;
 642 }
 643
 644 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 645 {
 646         device->performance.state = ACPI_STATE_UNKNOWN;
 647         return 0;
 648 }
 649
 650 static acpi_status
 651 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 652                                              union acpi_object *package)
 653 {
 654         int i = 0;
 655         union acpi_object *element = NULL;
 656
 657         if (!device || !package || (package->package.count < 2))
 658                 return AE_BAD_PARAMETER;
 659
 660         element = &(package->package.elements[0]);
 661         if (!element)
 662                 return AE_BAD_PARAMETER;
 663         if (element->type == ACPI_TYPE_PACKAGE) {
 664                 if ((element->package.count < 2) ||
 665                     (element->package.elements[0].type !=
 666                      ACPI_TYPE_LOCAL_REFERENCE)
 667                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 668                         return AE_BAD_DATA;
 669                 device->wakeup.gpe_device =
 670                     element->package.elements[0].reference.handle;
 671                 device->wakeup.gpe_number =
 672                     (u32) element->package.elements[1].integer.value;
 673         } else if (element->type == ACPI_TYPE_INTEGER) {
 674                 device->wakeup.gpe_number = element->integer.value;
 675         } else
 676                 return AE_BAD_DATA;
 677
 678         element = &(package->package.elements[1]);
 679         if (element->type != ACPI_TYPE_INTEGER) {
 680                 return AE_BAD_DATA;
 681         }
 682         device->wakeup.sleep_state = element->integer.value;
 683
 684         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 685                 return AE_NO_MEMORY;
 686         }
 687         device->wakeup.resources.count = package->package.count - 2;
 688         for (i = 0; i < device->wakeup.resources.count; i++) {
 689                 element = &(package->package.elements[i + 2]);
 690                 if (element->type != ACPI_TYPE_ANY) {
 691                         return AE_BAD_DATA;
 692                 }
 693
 694                 device->wakeup.resources.handles[i] = element->reference.handle;
 695         }
 696
 697         return AE_OK;
 698 }
 699
 700 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 701 {
 702         acpi_status status = 0;
 703         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 704         union acpi_object *package = NULL;
 705
 706
 707         /* _PRW */
 708         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 709         if (ACPI_FAILURE(status)) {
 710                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 711                 goto end;
 712         }
 713
 714         package = (union acpi_object *)buffer.pointer;
 715         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 716         if (ACPI_FAILURE(status)) {
 717                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 718                 goto end;
 719         }
 720
 721         kfree(buffer.pointer);
 722
 723         device->wakeup.flags.valid = 1;
 724         /* Power button, Lid switch always enable wakeup */
 725         if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
 726                 device->wakeup.flags.run_wake = 1;
 727
 728       end:
 729         if (ACPI_FAILURE(status))
 730                 device->flags.wake_capable = 0;
 731         return 0;
 732 }
 733
 734 static int acpi_bus_get_power_flags(struct acpi_device *device)
 735 {
 736         acpi_status status = 0;
 737         acpi_handle handle = NULL;
 738         u32 i = 0;
 739
 740
 741         /*
 742          * Power Management Flags
 743          */
 744         status = acpi_get_handle(device->handle, "_PSC", &handle);
 745         if (ACPI_SUCCESS(status))
 746                 device->power.flags.explicit_get = 1;
 747         status = acpi_get_handle(device->handle, "_IRC", &handle);
 748         if (ACPI_SUCCESS(status))
 749                 device->power.flags.inrush_current = 1;
 750
 751         /*
 752          * Enumerate supported power management states
 753          */
 754         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 755                 struct acpi_device_power_state *ps = &device->power.states[i];
 756                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 757
 758                 /* Evaluate "_PRx" to se if power resources are referenced */
 759                 acpi_evaluate_reference(device->handle, object_name, NULL,
 760                                         &ps->resources);
 761                 if (ps->resources.count) {
 762                         device->power.flags.power_resources = 1;
 763                         ps->flags.valid = 1;
 764                 }
 765
 766                 /* Evaluate "_PSx" to see if we can do explicit sets */
 767                 object_name[2] = 'S';
 768                 status = acpi_get_handle(device->handle, object_name, &handle);
 769                 if (ACPI_SUCCESS(status)) {
 770                         ps->flags.explicit_set = 1;
 771                         ps->flags.valid = 1;
 772                 }
 773
 774                 /* State is valid if we have some power control */
 775                 if (ps->resources.count || ps->flags.explicit_set)
 776                         ps->flags.valid = 1;
 777
 778                 ps->power = -1; /* Unknown - driver assigned */
 779                 ps->latency = -1;       /* Unknown - driver assigned */
 780         }
 781
 782         /* Set defaults for D0 and D3 states (always valid) */
 783         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 784         device->power.states[ACPI_STATE_D0].power = 100;
 785         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 786         device->power.states[ACPI_STATE_D3].power = 0;
 787
 788         /* TBD: System wake support and resource requirements. */
 789
 790         device->power.state = ACPI_STATE_UNKNOWN;
 791
 792         return 0;
 793 }
 794
 795 static int acpi_bus_get_flags(struct acpi_device *device)
 796 {
 797         acpi_status status = AE_OK;
 798         acpi_handle temp = NULL;
 799
 800
 801         /* Presence of _STA indicates 'dynamic_status' */
 802         status = acpi_get_handle(device->handle, "_STA", &temp);
 803         if (ACPI_SUCCESS(status))
 804                 device->flags.dynamic_status = 1;
 805
 806         /* Presence of _CID indicates 'compatible_ids' */
 807         status = acpi_get_handle(device->handle, "_CID", &temp);
 808         if (ACPI_SUCCESS(status))
 809                 device->flags.compatible_ids = 1;
 810
 811         /* Presence of _RMV indicates 'removable' */
 812         status = acpi_get_handle(device->handle, "_RMV", &temp);
 813         if (ACPI_SUCCESS(status))
 814                 device->flags.removable = 1;
 815
 816         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 817         status = acpi_get_handle(device->handle, "_EJD", &temp);
 818         if (ACPI_SUCCESS(status))
 819                 device->flags.ejectable = 1;
 820         else {
 821                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 822                 if (ACPI_SUCCESS(status))
 823                         device->flags.ejectable = 1;
 824         }
 825
 826         /* Presence of _LCK indicates 'lockable' */
 827         status = acpi_get_handle(device->handle, "_LCK", &temp);
 828         if (ACPI_SUCCESS(status))
 829                 device->flags.lockable = 1;
 830
 831         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 832         status = acpi_get_handle(device->handle, "_PS0", &temp);
 833         if (ACPI_FAILURE(status))
 834                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 835         if (ACPI_SUCCESS(status))
 836                 device->flags.power_manageable = 1;
 837
 838         /* Presence of _PRW indicates wake capable */
 839         status = acpi_get_handle(device->handle, "_PRW", &temp);
 840         if (ACPI_SUCCESS(status))
 841                 device->flags.wake_capable = 1;
 842
 843         /* TBD: Peformance management */
 844
 845         return 0;
 846 }
 847
 848 static void acpi_device_get_busid(struct acpi_device *device,
 849                                   acpi_handle handle, int type)
 850 {
 851         char bus_id[5] = { '?', 0 };
 852         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 853         int i = 0;
 854
 855         /*
 856          * Bus ID
 857          * ------
 858          * The device's Bus ID is simply the object name.
 859          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 860          */
 861         switch (type) {
 862         case ACPI_BUS_TYPE_SYSTEM:
 863                 strcpy(device->pnp.bus_id, "ACPI");
 864                 break;
 865         case ACPI_BUS_TYPE_POWER_BUTTON:
 866                 strcpy(device->pnp.bus_id, "PWRF");
 867                 break;
 868         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 869                 strcpy(device->pnp.bus_id, "SLPF");
 870                 break;
 871         default:
 872                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 873                 /* Clean up trailing underscores (if any) */
 874                 for (i = 3; i > 1; i--) {
 875                         if (bus_id[i] == '_')
 876                                 bus_id[i] = '\0';
 877                         else
 878                                 break;
 879                 }
 880                 strcpy(device->pnp.bus_id, bus_id);
 881                 break;
 882         }
 883 }
 884
 885 static void acpi_device_set_id(struct acpi_device *device,
 886                                struct acpi_device *parent, acpi_handle handle,
 887                                int type)
 888 {
 889         struct acpi_device_info *info;
 890         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 891         char *hid = NULL;
 892         char *uid = NULL;
 893         struct acpi_compatible_id_list *cid_list = NULL;
 894         acpi_status status;
 895
 896         switch (type) {
 897         case ACPI_BUS_TYPE_DEVICE:
 898                 status = acpi_get_object_info(handle, &buffer);
 899                 if (ACPI_FAILURE(status)) {
 900                         printk("%s: Error reading device info\n", __FUNCTION__);
 901                         return;
 902                 }
 903
 904                 info = buffer.pointer;
 905                 if (info->valid & ACPI_VALID_HID)
 906                         hid = info->hardware_id.value;
 907                 if (info->valid & ACPI_VALID_UID)
 908                         uid = info->unique_id.value;
 909                 if (info->valid & ACPI_VALID_CID)
 910                         cid_list = &info->compatibility_id;
 911                 if (info->valid & ACPI_VALID_ADR) {
 912                         device->pnp.bus_address = info->address;
 913                         device->flags.bus_address = 1;
 914                 }
 915                 break;
 916         case ACPI_BUS_TYPE_POWER:
 917                 hid = ACPI_POWER_HID;
 918                 break;
 919         case ACPI_BUS_TYPE_PROCESSOR:
 920                 hid = ACPI_PROCESSOR_HID;
 921                 break;
 922         case ACPI_BUS_TYPE_SYSTEM:
 923                 hid = ACPI_SYSTEM_HID;
 924                 break;
 925         case ACPI_BUS_TYPE_THERMAL:
 926                 hid = ACPI_THERMAL_HID;
 927                 break;
 928         case ACPI_BUS_TYPE_POWER_BUTTON:
 929                 hid = ACPI_BUTTON_HID_POWERF;
 930                 break;
 931         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 932                 hid = ACPI_BUTTON_HID_SLEEPF;
 933                 break;
 934         }
 935
 936         /*
 937          * \_SB
 938          * ----
 939          * Fix for the system root bus device -- the only root-level device.
 940          */
 941         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
 942                 hid = ACPI_BUS_HID;
 943                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
 944                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
 945         }
 946
 947         if (hid) {
 948                 strcpy(device->pnp.hardware_id, hid);
 949                 device->flags.hardware_id = 1;
 950         }
 951         if (uid) {
 952                 strcpy(device->pnp.unique_id, uid);
 953                 device->flags.unique_id = 1;
 954         }
 955         if (cid_list) {
 956                 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
 957                 if (device->pnp.cid_list)
 958                         memcpy(device->pnp.cid_list, cid_list, cid_list->size);
 959                 else
 960                         printk(KERN_ERR "Memory allocation error\n");
 961         }
 962
 963         kfree(buffer.pointer);
 964 }
 965
 966 static int acpi_device_set_context(struct acpi_device *device, int type)
 967 {
 968         acpi_status status = AE_OK;
 969         int result = 0;
 970         /*
 971          * Context
 972          * -------
 973          * Attach this 'struct acpi_device' to the ACPI object.  This makes
 974          * resolutions from handle->device very efficient.  Note that we need
 975          * to be careful with fixed-feature devices as they all attach to the
 976          * root object.
 977          */
 978         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
 979             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
 980                 status = acpi_attach_data(device->handle,
 981                                           acpi_bus_data_handler, device);
 982
 983                 if (ACPI_FAILURE(status)) {
 984                         printk("Error attaching device data\n");
 985                         result = -ENODEV;
 986                 }
 987         }
 988         return result;
 989 }
 990
 991 static void acpi_device_get_debug_info(struct acpi_device *device,
 992                                        acpi_handle handle, int type)
 993 {
 994 #ifdef CONFIG_ACPI_DEBUG_OUTPUT
 995         char *type_string = NULL;
 996         char name[80] = { '?', '\0' };
 997         struct acpi_buffer buffer = { sizeof(name), name };
 998
 999         switch (type) {
1000         case ACPI_BUS_TYPE_DEVICE:
1001                 type_string = "Device";
1002                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1003                 break;
1004         case ACPI_BUS_TYPE_POWER:
1005                 type_string = "Power Resource";
1006                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1007                 break;
1008         case ACPI_BUS_TYPE_PROCESSOR:
1009                 type_string = "Processor";
1010                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1011                 break;
1012         case ACPI_BUS_TYPE_SYSTEM:
1013                 type_string = "System";
1014                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1015                 break;
1016         case ACPI_BUS_TYPE_THERMAL:
1017                 type_string = "Thermal Zone";
1018                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1019                 break;
1020         case ACPI_BUS_TYPE_POWER_BUTTON:
1021                 type_string = "Power Button";
1022                 sprintf(name, "PWRB");
1023                 break;
1024         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1025                 type_string = "Sleep Button";
1026                 sprintf(name, "SLPB");
1027                 break;
1028         }
1029
1030         printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
1031 #endif                          /*CONFIG_ACPI_DEBUG_OUTPUT */
1032 }
1033
1034 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1035 {
1036         int result = 0;
1037         struct acpi_driver *driver;
1038
1039
1040         if (!dev)
1041                 return -EINVAL;
1042
1043         driver = dev->driver;
1044
1045         if ((driver) && (driver->ops.remove)) {
1046
1047                 if (driver->ops.stop) {
1048                         result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT);
1049                         if (result)
1050                                 return result;
1051                 }
1052
1053                 result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT);
1054                 if (result) {
1055                         return result;
1056                 }
1057
1058                 atomic_dec(&dev->driver->references);
1059                 dev->driver = NULL;
1060                 acpi_driver_data(dev) = NULL;
1061         }
1062
1063         if (!rmdevice)
1064                 return 0;
1065
1066         if (dev->flags.bus_address) {
1067                 if ((dev->parent) && (dev->parent->ops.unbind))
1068                         dev->parent->ops.unbind(dev);
1069         }
1070
1071         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1072
1073         return 0;
1074 }
1075
1076 static int
1077 acpi_add_single_object(struct acpi_device **child,
1078                        struct acpi_device *parent, acpi_handle handle, int type)
1079 {
1080         int result = 0;
1081         struct acpi_device *device = NULL;
1082
1083
1084         if (!child)
1085                 return -EINVAL;
1086
1087         device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
1088         if (!device) {
1089                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1090                 return -ENOMEM;
1091         }
1092         memset(device, 0, sizeof(struct acpi_device));
1093
1094         device->handle = handle;
1095         device->parent = parent;
1096
1097         acpi_device_get_busid(device, handle, type);
1098
1099         /*
1100          * Flags
1101          * -----
1102          * Get prior to calling acpi_bus_get_status() so we know whether
1103          * or not _STA is present.  Note that we only look for object
1104          * handles -- cannot evaluate objects until we know the device is
1105          * present and properly initialized.
1106          */
1107         result = acpi_bus_get_flags(device);
1108         if (result)
1109                 goto end;
1110
1111         /*
1112          * Status
1113          * ------
1114          * See if the device is present.  We always assume that non-Device
1115          * and non-Processor objects (e.g. thermal zones, power resources,
1116          * etc.) are present, functioning, etc. (at least when parent object
1117          * is present).  Note that _STA has a different meaning for some
1118          * objects (e.g. power resources) so we need to be careful how we use
1119          * it.
1120          */
1121         switch (type) {
1122         case ACPI_BUS_TYPE_PROCESSOR:
1123         case ACPI_BUS_TYPE_DEVICE:
1124                 result = acpi_bus_get_status(device);
1125                 if (ACPI_FAILURE(result) || !device->status.present) {
1126                         result = -ENOENT;
1127                         goto end;
1128                 }
1129                 break;
1130         default:
1131                 STRUCT_TO_INT(device->status) = 0x0F;
1132                 break;
1133         }
1134
1135         /*
1136          * Initialize Device
1137          * -----------------
1138          * TBD: Synch with Core's enumeration/initialization process.
1139          */
1140
1141         /*
1142          * Hardware ID, Unique ID, & Bus Address
1143          * -------------------------------------
1144          */
1145         acpi_device_set_id(device, parent, handle, type);
1146
1147         /*
1148          * Power Management
1149          * ----------------
1150          */
1151         if (device->flags.power_manageable) {
1152                 result = acpi_bus_get_power_flags(device);
1153                 if (result)
1154                         goto end;
1155         }
1156
1157         /*
1158          * Wakeup device management
1159          *-----------------------
1160          */
1161         if (device->flags.wake_capable) {
1162                 result = acpi_bus_get_wakeup_device_flags(device);
1163                 if (result)
1164                         goto end;
1165         }
1166
1167         /*
1168          * Performance Management
1169          * ----------------------
1170          */
1171         if (device->flags.performance_manageable) {
1172                 result = acpi_bus_get_perf_flags(device);
1173                 if (result)
1174                         goto end;
1175         }
1176
1177         if ((result = acpi_device_set_context(device, type)))
1178                 goto end;
1179
1180         acpi_device_get_debug_info(device, handle, type);
1181
1182         acpi_device_register(device, parent);
1183
1184         /*
1185          * Bind _ADR-Based Devices
1186          * -----------------------
1187          * If there's a a bus address (_ADR) then we utilize the parent's
1188          * 'bind' function (if exists) to bind the ACPI- and natively-
1189          * enumerated device representations.
1190          */
1191         if (device->flags.bus_address) {
1192                 if (device->parent && device->parent->ops.bind)
1193                         device->parent->ops.bind(device);
1194         }
1195
1196         /*
1197          * Locate & Attach Driver
1198          * ----------------------
1199          * If there's a hardware id (_HID) or compatible ids (_CID) we check
1200          * to see if there's a driver installed for this kind of device.  Note
1201          * that drivers can install before or after a device is enumerated.
1202          *
1203          * TBD: Assumes LDM provides driver hot-plug capability.
1204          */
1205         acpi_bus_find_driver(device);
1206
1207       end:
1208         if (!result)
1209                 *child = device;
1210         else {
1211                 kfree(device->pnp.cid_list);
1212                 kfree(device);
1213         }
1214
1215         return result;
1216 }
1217
1218 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1219 {
1220         acpi_status status = AE_OK;
1221         struct acpi_device *parent = NULL;
1222         struct acpi_device *child = NULL;
1223         acpi_handle phandle = NULL;
1224         acpi_handle chandle = NULL;
1225         acpi_object_type type = 0;
1226         u32 level = 1;
1227
1228
1229         if (!start)
1230                 return -EINVAL;
1231
1232         parent = start;
1233         phandle = start->handle;
1234
1235         /*
1236          * Parse through the ACPI namespace, identify all 'devices', and
1237          * create a new 'struct acpi_device' for each.
1238          */
1239         while ((level > 0) && parent) {
1240
1241                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1242                                               chandle, &chandle);
1243
1244                 /*
1245                  * If this scope is exhausted then move our way back up.
1246                  */
1247                 if (ACPI_FAILURE(status)) {
1248                         level--;
1249                         chandle = phandle;
1250                         acpi_get_parent(phandle, &phandle);
1251                         if (parent->parent)
1252                                 parent = parent->parent;
1253                         continue;
1254                 }
1255
1256                 status = acpi_get_type(chandle, &type);
1257                 if (ACPI_FAILURE(status))
1258                         continue;
1259
1260                 /*
1261                  * If this is a scope object then parse it (depth-first).
1262                  */
1263                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1264                         level++;
1265                         phandle = chandle;
1266                         chandle = NULL;
1267                         continue;
1268                 }
1269
1270                 /*
1271                  * We're only interested in objects that we consider 'devices'.
1272                  */
1273                 switch (type) {
1274                 case ACPI_TYPE_DEVICE:
1275                         type = ACPI_BUS_TYPE_DEVICE;
1276                         break;
1277                 case ACPI_TYPE_PROCESSOR:
1278                         type = ACPI_BUS_TYPE_PROCESSOR;
1279                         break;
1280                 case ACPI_TYPE_THERMAL:
1281                         type = ACPI_BUS_TYPE_THERMAL;
1282                         break;
1283                 case ACPI_TYPE_POWER:
1284                         type = ACPI_BUS_TYPE_POWER;
1285                         break;
1286                 default:
1287                         continue;
1288                 }
1289
1290                 if (ops->acpi_op_add)
1291                         status = acpi_add_single_object(&child, parent,
1292                                                         chandle, type);
1293                 else
1294                         status = acpi_bus_get_device(chandle, &child);
1295
1296                 if (ACPI_FAILURE(status))
1297                         continue;
1298
1299                 if (ops->acpi_op_start) {
1300                         status = acpi_start_single_object(child);
1301                         if (ACPI_FAILURE(status))
1302                                 continue;
1303                 }
1304
1305                 /*
1306                  * If the device is present, enabled, and functioning then
1307                  * parse its scope (depth-first).  Note that we need to
1308                  * represent absent devices to facilitate PnP notifications
1309                  * -- but only the subtree head (not all of its children,
1310                  * which will be enumerated when the parent is inserted).
1311                  *
1312                  * TBD: Need notifications and other detection mechanisms
1313                  *      in place before we can fully implement this.
1314                  */
1315                 if (child->status.present) {
1316                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1317                                                       NULL, NULL);
1318                         if (ACPI_SUCCESS(status)) {
1319                                 level++;
1320                                 phandle = chandle;
1321                                 chandle = NULL;
1322                                 parent = child;
1323                         }
1324                 }
1325         }
1326
1327         return 0;
1328 }
1329
1330 int
1331 acpi_bus_add(struct acpi_device **child,
1332              struct acpi_device *parent, acpi_handle handle, int type)
1333 {
1334         int result;
1335         struct acpi_bus_ops ops;
1336
1337
1338         result = acpi_add_single_object(child, parent, handle, type);
1339         if (!result) {
1340                 memset(&ops, 0, sizeof(ops));
1341                 ops.acpi_op_add = 1;
1342                 result = acpi_bus_scan(*child, &ops);
1343         }
1344         return result;
1345 }
1346
1347 EXPORT_SYMBOL(acpi_bus_add);
1348
1349 int acpi_bus_start(struct acpi_device *device)
1350 {
1351         int result;
1352         struct acpi_bus_ops ops;
1353
1354
1355         if (!device)
1356                 return -EINVAL;
1357
1358         result = acpi_start_single_object(device);
1359         if (!result) {
1360                 memset(&ops, 0, sizeof(ops));
1361                 ops.acpi_op_start = 1;
1362                 result = acpi_bus_scan(device, &ops);
1363         }
1364         return result;
1365 }
1366
1367 EXPORT_SYMBOL(acpi_bus_start);
1368
1369 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1370 {
1371         acpi_status status;
1372         struct acpi_device *parent, *child;
1373         acpi_handle phandle, chandle;
1374         acpi_object_type type;
1375         u32 level = 1;
1376         int err = 0;
1377
1378         parent = start;
1379         phandle = start->handle;
1380         child = chandle = NULL;
1381
1382         while ((level > 0) && parent && (!err)) {
1383                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1384                                               chandle, &chandle);
1385
1386                 /*
1387                  * If this scope is exhausted then move our way back up.
1388                  */
1389                 if (ACPI_FAILURE(status)) {
1390                         level--;
1391                         chandle = phandle;
1392                         acpi_get_parent(phandle, &phandle);
1393                         child = parent;
1394                         parent = parent->parent;
1395
1396                         if (level == 0)
1397                                 err = acpi_bus_remove(child, rmdevice);
1398                         else
1399                                 err = acpi_bus_remove(child, 1);
1400
1401                         continue;
1402                 }
1403
1404                 status = acpi_get_type(chandle, &type);
1405                 if (ACPI_FAILURE(status)) {
1406                         continue;
1407                 }
1408                 /*
1409                  * If there is a device corresponding to chandle then
1410                  * parse it (depth-first).
1411                  */
1412                 if (acpi_bus_get_device(chandle, &child) == 0) {
1413                         level++;
1414                         phandle = chandle;
1415                         chandle = NULL;
1416                         parent = child;
1417                 }
1418                 continue;
1419         }
1420         return err;
1421 }
1422 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1423
1424
1425 static int acpi_bus_scan_fixed(struct acpi_device *root)
1426 {
1427         int result = 0;
1428         struct acpi_device *device = NULL;
1429
1430
1431         if (!root)
1432                 return -ENODEV;
1433
1434         /*
1435          * Enumerate all fixed-feature devices.
1436          */
1437         if (acpi_fadt.pwr_button == 0) {
1438                 result = acpi_add_single_object(&device, acpi_root,
1439                                                 NULL,
1440                                                 ACPI_BUS_TYPE_POWER_BUTTON);
1441                 if (!result)
1442                         result = acpi_start_single_object(device);
1443         }
1444
1445         if (acpi_fadt.sleep_button == 0) {
1446                 result = acpi_add_single_object(&device, acpi_root,
1447                                                 NULL,
1448                                                 ACPI_BUS_TYPE_SLEEP_BUTTON);
1449                 if (!result)
1450                         result = acpi_start_single_object(device);
1451         }
1452
1453         return result;
1454 }
1455
1456 static int __init acpi_scan_init(void)
1457 {
1458         int result;
1459         struct acpi_bus_ops ops;
1460
1461
1462         if (acpi_disabled)
1463                 return 0;
1464
1465         result = kset_register(&acpi_namespace_kset);
1466         if (result < 0)
1467                 printk(KERN_ERR PREFIX "kset_register error: %d\n", result);
1468
1469         result = bus_register(&acpi_bus_type);
1470         if (result) {
1471                 /* We don't want to quit even if we failed to add suspend/resume */
1472                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1473         }
1474
1475         /*
1476          * Create the root device in the bus's device tree
1477          */
1478         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1479                                         ACPI_BUS_TYPE_SYSTEM);
1480         if (result)
1481                 goto Done;
1482
1483         result = acpi_start_single_object(acpi_root);
1484         if (result)
1485                 goto Done;
1486
1487         acpi_root->dev.bus = &acpi_bus_type;
1488         snprintf(acpi_root->dev.bus_id, BUS_ID_SIZE, "%s", acpi_bus_type.name);
1489         result = device_register(&acpi_root->dev);
1490         if (result) {
1491                 /* We don't want to quit even if we failed to add suspend/resume */
1492                 printk(KERN_ERR PREFIX "Could not register device\n");
1493         }
1494
1495         /*
1496          * Enumerate devices in the ACPI namespace.
1497          */
1498         result = acpi_bus_scan_fixed(acpi_root);
1499         if (!result) {
1500                 memset(&ops, 0, sizeof(ops));
1501                 ops.acpi_op_add = 1;
1502                 ops.acpi_op_start = 1;
1503                 result = acpi_bus_scan(acpi_root, &ops);
1504         }
1505
1506         if (result)
1507                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1508
1509       Done:
1510         return result;
1511 }
1512
1513 subsys_initcall(acpi_scan_init);