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