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                    "LNXSYBUS"
  20 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  21
  22 static LIST_HEAD(acpi_device_list);
  23 static LIST_HEAD(acpi_bus_id_list);
  24 DEFINE_SPINLOCK(acpi_device_lock);
  25 LIST_HEAD(acpi_wakeup_device_list);
  26
  27 struct acpi_device_bus_id{
  28         char bus_id[15];
  29         unsigned int instance_no;
  30         struct list_head node;
  31 };
  32
  33 /*
  34  * Creates hid/cid(s) string needed for modalias and uevent
  35  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  36  * char *modalias: "acpi:IBM0001:ACPI0001"
  37 */
  38 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  39                            int size)
  40 {
  41         int len;
  42
  43         if (!acpi_dev->flags.hardware_id)
  44                 return -ENODEV;
  45
  46         len = snprintf(modalias, size, "acpi:%s:",
  47                        acpi_dev->pnp.hardware_id);
  48         if (len < 0 || len >= size)
  49                 return -EINVAL;
  50         size -= len;
  51
  52         if (acpi_dev->flags.compatible_ids) {
  53                 struct acpi_compatible_id_list *cid_list;
  54                 int i;
  55                 int count;
  56
  57                 cid_list = acpi_dev->pnp.cid_list;
  58                 for (i = 0; i < cid_list->count; i++) {
  59                         count = snprintf(&modalias[len], size, "%s:",
  60                                          cid_list->id[i].value);
  61                         if (count < 0 || count >= size) {
  62                                 printk(KERN_ERR "acpi: %s cid[%i] exceeds event buffer size",
  63                                        acpi_dev->pnp.device_name, i);
  64                                 break;
  65                         }
  66                         len += count;
  67                         size -= count;
  68                 }
  69         }
  70
  71         modalias[len] = '\0';
  72         return len;
  73 }
  74
  75 static ssize_t
  76 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  77         struct acpi_device *acpi_dev = to_acpi_device(dev);
  78         int len;
  79
  80         /* Device has no HID and no CID or string is >1024 */
  81         len = create_modalias(acpi_dev, buf, 1024);
  82         if (len <= 0)
  83                 return 0;
  84         buf[len++] = '\n';
  85         return len;
  86 }
  87 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  88
  89 static int acpi_eject_operation(acpi_handle handle, int lockable)
  90 {
  91         struct acpi_object_list arg_list;
  92         union acpi_object arg;
  93         acpi_status status = AE_OK;
  94
  95         /*
  96          * TBD: evaluate _PS3?
  97          */
  98
  99         if (lockable) {
 100                 arg_list.count = 1;
 101                 arg_list.pointer = &arg;
 102                 arg.type = ACPI_TYPE_INTEGER;
 103                 arg.integer.value = 0;
 104                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 105         }
 106
 107         arg_list.count = 1;
 108         arg_list.pointer = &arg;
 109         arg.type = ACPI_TYPE_INTEGER;
 110         arg.integer.value = 1;
 111
 112         /*
 113          * TBD: _EJD support.
 114          */
 115
 116         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 117         if (ACPI_FAILURE(status)) {
 118                 return (-ENODEV);
 119         }
 120
 121         return (0);
 122 }
 123
 124 static ssize_t
 125 acpi_eject_store(struct device *d, struct device_attribute *attr,
 126                 const char *buf, size_t count)
 127 {
 128         int result;
 129         int ret = count;
 130         int islockable;
 131         acpi_status status;
 132         acpi_handle handle;
 133         acpi_object_type type = 0;
 134         struct acpi_device *acpi_device = to_acpi_device(d);
 135
 136         if ((!count) || (buf[0] != '1')) {
 137                 return -EINVAL;
 138         }
 139 #ifndef FORCE_EJECT
 140         if (acpi_device->driver == NULL) {
 141                 ret = -ENODEV;
 142                 goto err;
 143         }
 144 #endif
 145         status = acpi_get_type(acpi_device->handle, &type);
 146         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 147                 ret = -ENODEV;
 148                 goto err;
 149         }
 150
 151         islockable = acpi_device->flags.lockable;
 152         handle = acpi_device->handle;
 153
 154         result = acpi_bus_trim(acpi_device, 1);
 155
 156         if (!result)
 157                 result = acpi_eject_operation(handle, islockable);
 158
 159         if (result) {
 160                 ret = -EBUSY;
 161         }
 162       err:
 163         return ret;
 164 }
 165
 166 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 167
 168 static ssize_t
 169 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 170         struct acpi_device *acpi_dev = to_acpi_device(dev);
 171
 172         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
 173 }
 174 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 175
 176 static ssize_t
 177 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 178         struct acpi_device *acpi_dev = to_acpi_device(dev);
 179         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 180         int result;
 181
 182         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 183         if(result)
 184                 goto end;
 185
 186         result = sprintf(buf, "%s\n", (char*)path.pointer);
 187         kfree(path.pointer);
 188   end:
 189         return result;
 190 }
 191 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 192
 193 static int acpi_device_setup_files(struct acpi_device *dev)
 194 {
 195         acpi_status status;
 196         acpi_handle temp;
 197         int result = 0;
 198
 199         /*
 200          * Devices gotten from FADT don't have a "path" attribute
 201          */
 202         if(dev->handle) {
 203                 result = device_create_file(&dev->dev, &dev_attr_path);
 204                 if(result)
 205                         goto end;
 206         }
 207
 208         if(dev->flags.hardware_id) {
 209                 result = device_create_file(&dev->dev, &dev_attr_hid);
 210                 if(result)
 211                         goto end;
 212         }
 213
 214         if (dev->flags.hardware_id || dev->flags.compatible_ids){
 215                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 216                 if(result)
 217                         goto end;
 218         }
 219
 220         /*
 221          * If device has _EJ0, 'eject' file is created that is used to trigger
 222          * hot-removal function from userland.
 223          */
 224         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 225         if (ACPI_SUCCESS(status))
 226                 result = device_create_file(&dev->dev, &dev_attr_eject);
 227   end:
 228         return result;
 229 }
 230
 231 static void acpi_device_remove_files(struct acpi_device *dev)
 232 {
 233         acpi_status status;
 234         acpi_handle temp;
 235
 236         /*
 237          * If device has _EJ0, 'eject' file is created that is used to trigger
 238          * hot-removal function from userland.
 239          */
 240         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 241         if (ACPI_SUCCESS(status))
 242                 device_remove_file(&dev->dev, &dev_attr_eject);
 243
 244         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 245                 device_remove_file(&dev->dev, &dev_attr_modalias);
 246
 247         if(dev->flags.hardware_id)
 248                 device_remove_file(&dev->dev, &dev_attr_hid);
 249         if(dev->handle)
 250                 device_remove_file(&dev->dev, &dev_attr_path);
 251 }
 252 /* --------------------------------------------------------------------------
 253                         ACPI Bus operations
 254    -------------------------------------------------------------------------- */
 255
 256 int acpi_match_device_ids(struct acpi_device *device,
 257                           const struct acpi_device_id *ids)
 258 {
 259         const struct acpi_device_id *id;
 260
 261         if (device->flags.hardware_id) {
 262                 for (id = ids; id->id[0]; id++) {
 263                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 264                                 return 0;
 265                 }
 266         }
 267
 268         if (device->flags.compatible_ids) {
 269                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 270                 int i;
 271
 272                 for (id = ids; id->id[0]; id++) {
 273                         /* compare multiple _CID entries against driver ids */
 274                         for (i = 0; i < cid_list->count; i++) {
 275                                 if (!strcmp((char*)id->id,
 276                                             cid_list->id[i].value))
 277                                         return 0;
 278                         }
 279                 }
 280         }
 281
 282         return -ENOENT;
 283 }
 284 EXPORT_SYMBOL(acpi_match_device_ids);
 285
 286 static void acpi_device_release(struct device *dev)
 287 {
 288         struct acpi_device *acpi_dev = to_acpi_device(dev);
 289
 290         kfree(acpi_dev->pnp.cid_list);
 291         kfree(acpi_dev);
 292 }
 293
 294 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 295 {
 296         struct acpi_device *acpi_dev = to_acpi_device(dev);
 297         struct acpi_driver *acpi_drv = acpi_dev->driver;
 298
 299         if (acpi_drv && acpi_drv->ops.suspend)
 300                 return acpi_drv->ops.suspend(acpi_dev, state);
 301         return 0;
 302 }
 303
 304 static int acpi_device_resume(struct device *dev)
 305 {
 306         struct acpi_device *acpi_dev = to_acpi_device(dev);
 307         struct acpi_driver *acpi_drv = acpi_dev->driver;
 308
 309         if (acpi_drv && acpi_drv->ops.resume)
 310                 return acpi_drv->ops.resume(acpi_dev);
 311         return 0;
 312 }
 313
 314 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 315 {
 316         struct acpi_device *acpi_dev = to_acpi_device(dev);
 317         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 318
 319         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 320 }
 321
 322 static int acpi_device_uevent(struct device *dev, char **envp, int num_envp,
 323                               char *buffer, int buffer_size)
 324 {
 325         struct acpi_device *acpi_dev = to_acpi_device(dev);
 326
 327         strcpy(buffer, "MODALIAS=");
 328         if (create_modalias(acpi_dev, buffer + 9, buffer_size - 9) > 0) {
 329                 envp[0] = buffer;
 330                 envp[1] = NULL;
 331         }
 332         return 0;
 333 }
 334
 335 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 336 static int acpi_start_single_object(struct acpi_device *);
 337 static int acpi_device_probe(struct device * dev)
 338 {
 339         struct acpi_device *acpi_dev = to_acpi_device(dev);
 340         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 341         int ret;
 342
 343         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 344         if (!ret) {
 345                 if (acpi_dev->bus_ops.acpi_op_start)
 346                         acpi_start_single_object(acpi_dev);
 347                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 348                         "Found driver [%s] for device [%s]\n",
 349                         acpi_drv->name, acpi_dev->pnp.bus_id));
 350                 get_device(dev);
 351         }
 352         return ret;
 353 }
 354
 355 static int acpi_device_remove(struct device * dev)
 356 {
 357         struct acpi_device *acpi_dev = to_acpi_device(dev);
 358         struct acpi_driver *acpi_drv = acpi_dev->driver;
 359
 360         if (acpi_drv) {
 361                 if (acpi_drv->ops.stop)
 362                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 363                 if (acpi_drv->ops.remove)
 364                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 365         }
 366         acpi_dev->driver = NULL;
 367         acpi_driver_data(dev) = NULL;
 368
 369         put_device(dev);
 370         return 0;
 371 }
 372
 373 static void acpi_device_shutdown(struct device *dev)
 374 {
 375         struct acpi_device *acpi_dev = to_acpi_device(dev);
 376         struct acpi_driver *acpi_drv = acpi_dev->driver;
 377
 378         if (acpi_drv && acpi_drv->ops.shutdown)
 379                 acpi_drv->ops.shutdown(acpi_dev);
 380
 381         return ;
 382 }
 383
 384 struct bus_type acpi_bus_type = {
 385         .name           = "acpi",
 386         .suspend        = acpi_device_suspend,
 387         .resume         = acpi_device_resume,
 388         .shutdown       = acpi_device_shutdown,
 389         .match          = acpi_bus_match,
 390         .probe          = acpi_device_probe,
 391         .remove         = acpi_device_remove,
 392         .uevent         = acpi_device_uevent,
 393 };
 394
 395 static int acpi_device_register(struct acpi_device *device,
 396                                  struct acpi_device *parent)
 397 {
 398         int result;
 399         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 400         int found = 0;
 401         /*
 402          * Linkage
 403          * -------
 404          * Link this device to its parent and siblings.
 405          */
 406         INIT_LIST_HEAD(&device->children);
 407         INIT_LIST_HEAD(&device->node);
 408         INIT_LIST_HEAD(&device->g_list);
 409         INIT_LIST_HEAD(&device->wakeup_list);
 410
 411         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 412         if (!new_bus_id) {
 413                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 414                 return -ENOMEM;
 415         }
 416
 417         spin_lock(&acpi_device_lock);
 418         /*
 419          * Find suitable bus_id and instance number in acpi_bus_id_list
 420          * If failed, create one and link it into acpi_bus_id_list
 421          */
 422         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 423                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 424                         acpi_device_bus_id->instance_no ++;
 425                         found = 1;
 426                         kfree(new_bus_id);
 427                         break;
 428                 }
 429         }
 430         if(!found) {
 431                 acpi_device_bus_id = new_bus_id;
 432                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 433                 acpi_device_bus_id->instance_no = 0;
 434                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 435         }
 436         sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 437
 438         if (device->parent) {
 439                 list_add_tail(&device->node, &device->parent->children);
 440                 list_add_tail(&device->g_list, &device->parent->g_list);
 441         } else
 442                 list_add_tail(&device->g_list, &acpi_device_list);
 443         if (device->wakeup.flags.valid)
 444                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 445         spin_unlock(&acpi_device_lock);
 446
 447         if (device->parent)
 448                 device->dev.parent = &parent->dev;
 449         device->dev.bus = &acpi_bus_type;
 450         device_initialize(&device->dev);
 451         device->dev.release = &acpi_device_release;
 452         result = device_add(&device->dev);
 453         if(result) {
 454                 printk("Error adding device %s", device->dev.bus_id);
 455                 goto end;
 456         }
 457
 458         result = acpi_device_setup_files(device);
 459         if(result)
 460                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
 461
 462         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 463         return 0;
 464   end:
 465         spin_lock(&acpi_device_lock);
 466         if (device->parent) {
 467                 list_del(&device->node);
 468                 list_del(&device->g_list);
 469         } else
 470                 list_del(&device->g_list);
 471         list_del(&device->wakeup_list);
 472         spin_unlock(&acpi_device_lock);
 473         return result;
 474 }
 475
 476 static void acpi_device_unregister(struct acpi_device *device, int type)
 477 {
 478         spin_lock(&acpi_device_lock);
 479         if (device->parent) {
 480                 list_del(&device->node);
 481                 list_del(&device->g_list);
 482         } else
 483                 list_del(&device->g_list);
 484
 485         list_del(&device->wakeup_list);
 486         spin_unlock(&acpi_device_lock);
 487
 488         acpi_detach_data(device->handle, acpi_bus_data_handler);
 489
 490         acpi_device_remove_files(device);
 491         device_unregister(&device->dev);
 492 }
 493
 494 /* --------------------------------------------------------------------------
 495                                  Driver Management
 496    -------------------------------------------------------------------------- */
 497 /**
 498  * acpi_bus_driver_init - add a device to a driver
 499  * @device: the device to add and initialize
 500  * @driver: driver for the device
 501  *
 502  * Used to initialize a device via its device driver.  Called whenever a
 503  * driver is bound to a device.  Invokes the driver's add() ops.
 504  */
 505 static int
 506 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 507 {
 508         int result = 0;
 509
 510
 511         if (!device || !driver)
 512                 return -EINVAL;
 513
 514         if (!driver->ops.add)
 515                 return -ENOSYS;
 516
 517         result = driver->ops.add(device);
 518         if (result) {
 519                 device->driver = NULL;
 520                 acpi_driver_data(device) = NULL;
 521                 return result;
 522         }
 523
 524         device->driver = driver;
 525
 526         /*
 527          * TBD - Configuration Management: Assign resources to device based
 528          * upon possible configuration and currently allocated resources.
 529          */
 530
 531         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 532                           "Driver successfully bound to device\n"));
 533         return 0;
 534 }
 535
 536 static int acpi_start_single_object(struct acpi_device *device)
 537 {
 538         int result = 0;
 539         struct acpi_driver *driver;
 540
 541
 542         if (!(driver = device->driver))
 543                 return 0;
 544
 545         if (driver->ops.start) {
 546                 result = driver->ops.start(device);
 547                 if (result && driver->ops.remove)
 548                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 549         }
 550
 551         return result;
 552 }
 553
 554 /**
 555  * acpi_bus_register_driver - register a driver with the ACPI bus
 556  * @driver: driver being registered
 557  *
 558  * Registers a driver with the ACPI bus.  Searches the namespace for all
 559  * devices that match the driver's criteria and binds.  Returns zero for
 560  * success or a negative error status for failure.
 561  */
 562 int acpi_bus_register_driver(struct acpi_driver *driver)
 563 {
 564         int ret;
 565
 566         if (acpi_disabled)
 567                 return -ENODEV;
 568         driver->drv.name = driver->name;
 569         driver->drv.bus = &acpi_bus_type;
 570         driver->drv.owner = driver->owner;
 571
 572         ret = driver_register(&driver->drv);
 573         return ret;
 574 }
 575
 576 EXPORT_SYMBOL(acpi_bus_register_driver);
 577
 578 /**
 579  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 580  * @driver: driver to unregister
 581  *
 582  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 583  * devices that match the driver's criteria and unbinds.
 584  */
 585 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 586 {
 587         driver_unregister(&driver->drv);
 588 }
 589
 590 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 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 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 626 {
 627         device->performance.state = ACPI_STATE_UNKNOWN;
 628         return 0;
 629 }
 630
 631 static acpi_status
 632 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 633                                              union acpi_object *package)
 634 {
 635         int i = 0;
 636         union acpi_object *element = NULL;
 637
 638         if (!device || !package || (package->package.count < 2))
 639                 return AE_BAD_PARAMETER;
 640
 641         element = &(package->package.elements[0]);
 642         if (!element)
 643                 return AE_BAD_PARAMETER;
 644         if (element->type == ACPI_TYPE_PACKAGE) {
 645                 if ((element->package.count < 2) ||
 646                     (element->package.elements[0].type !=
 647                      ACPI_TYPE_LOCAL_REFERENCE)
 648                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 649                         return AE_BAD_DATA;
 650                 device->wakeup.gpe_device =
 651                     element->package.elements[0].reference.handle;
 652                 device->wakeup.gpe_number =
 653                     (u32) element->package.elements[1].integer.value;
 654         } else if (element->type == ACPI_TYPE_INTEGER) {
 655                 device->wakeup.gpe_number = element->integer.value;
 656         } else
 657                 return AE_BAD_DATA;
 658
 659         element = &(package->package.elements[1]);
 660         if (element->type != ACPI_TYPE_INTEGER) {
 661                 return AE_BAD_DATA;
 662         }
 663         device->wakeup.sleep_state = element->integer.value;
 664
 665         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 666                 return AE_NO_MEMORY;
 667         }
 668         device->wakeup.resources.count = package->package.count - 2;
 669         for (i = 0; i < device->wakeup.resources.count; i++) {
 670                 element = &(package->package.elements[i + 2]);
 671                 if (element->type != ACPI_TYPE_ANY) {
 672                         return AE_BAD_DATA;
 673                 }
 674
 675                 device->wakeup.resources.handles[i] = element->reference.handle;
 676         }
 677
 678         return AE_OK;
 679 }
 680
 681 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 682 {
 683         acpi_status status = 0;
 684         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 685         union acpi_object *package = NULL;
 686
 687         struct acpi_device_id button_device_ids[] = {
 688                 {"PNP0C0D", 0},
 689                 {"PNP0C0C", 0},
 690                 {"PNP0C0E", 0},
 691                 {"", 0},
 692         };
 693
 694
 695         /* _PRW */
 696         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 697         if (ACPI_FAILURE(status)) {
 698                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 699                 goto end;
 700         }
 701
 702         package = (union acpi_object *)buffer.pointer;
 703         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 704         if (ACPI_FAILURE(status)) {
 705                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 706                 goto end;
 707         }
 708
 709         kfree(buffer.pointer);
 710
 711         device->wakeup.flags.valid = 1;
 712         /* Power button, Lid switch always enable wakeup */
 713         if (!acpi_match_device_ids(device, button_device_ids))
 714                 device->wakeup.flags.run_wake = 1;
 715
 716       end:
 717         if (ACPI_FAILURE(status))
 718                 device->flags.wake_capable = 0;
 719         return 0;
 720 }
 721
 722 static int acpi_bus_get_power_flags(struct acpi_device *device)
 723 {
 724         acpi_status status = 0;
 725         acpi_handle handle = NULL;
 726         u32 i = 0;
 727
 728
 729         /*
 730          * Power Management Flags
 731          */
 732         status = acpi_get_handle(device->handle, "_PSC", &handle);
 733         if (ACPI_SUCCESS(status))
 734                 device->power.flags.explicit_get = 1;
 735         status = acpi_get_handle(device->handle, "_IRC", &handle);
 736         if (ACPI_SUCCESS(status))
 737                 device->power.flags.inrush_current = 1;
 738
 739         /*
 740          * Enumerate supported power management states
 741          */
 742         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 743                 struct acpi_device_power_state *ps = &device->power.states[i];
 744                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 745
 746                 /* Evaluate "_PRx" to se if power resources are referenced */
 747                 acpi_evaluate_reference(device->handle, object_name, NULL,
 748                                         &ps->resources);
 749                 if (ps->resources.count) {
 750                         device->power.flags.power_resources = 1;
 751                         ps->flags.valid = 1;
 752                 }
 753
 754                 /* Evaluate "_PSx" to see if we can do explicit sets */
 755                 object_name[2] = 'S';
 756                 status = acpi_get_handle(device->handle, object_name, &handle);
 757                 if (ACPI_SUCCESS(status)) {
 758                         ps->flags.explicit_set = 1;
 759                         ps->flags.valid = 1;
 760                 }
 761
 762                 /* State is valid if we have some power control */
 763                 if (ps->resources.count || ps->flags.explicit_set)
 764                         ps->flags.valid = 1;
 765
 766                 ps->power = -1; /* Unknown - driver assigned */
 767                 ps->latency = -1;       /* Unknown - driver assigned */
 768         }
 769
 770         /* Set defaults for D0 and D3 states (always valid) */
 771         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 772         device->power.states[ACPI_STATE_D0].power = 100;
 773         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 774         device->power.states[ACPI_STATE_D3].power = 0;
 775
 776         /* TBD: System wake support and resource requirements. */
 777
 778         device->power.state = ACPI_STATE_UNKNOWN;
 779
 780         return 0;
 781 }
 782
 783 static int acpi_bus_get_flags(struct acpi_device *device)
 784 {
 785         acpi_status status = AE_OK;
 786         acpi_handle temp = NULL;
 787
 788
 789         /* Presence of _STA indicates 'dynamic_status' */
 790         status = acpi_get_handle(device->handle, "_STA", &temp);
 791         if (ACPI_SUCCESS(status))
 792                 device->flags.dynamic_status = 1;
 793
 794         /* Presence of _CID indicates 'compatible_ids' */
 795         status = acpi_get_handle(device->handle, "_CID", &temp);
 796         if (ACPI_SUCCESS(status))
 797                 device->flags.compatible_ids = 1;
 798
 799         /* Presence of _RMV indicates 'removable' */
 800         status = acpi_get_handle(device->handle, "_RMV", &temp);
 801         if (ACPI_SUCCESS(status))
 802                 device->flags.removable = 1;
 803
 804         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 805         status = acpi_get_handle(device->handle, "_EJD", &temp);
 806         if (ACPI_SUCCESS(status))
 807                 device->flags.ejectable = 1;
 808         else {
 809                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 810                 if (ACPI_SUCCESS(status))
 811                         device->flags.ejectable = 1;
 812         }
 813
 814         /* Presence of _LCK indicates 'lockable' */
 815         status = acpi_get_handle(device->handle, "_LCK", &temp);
 816         if (ACPI_SUCCESS(status))
 817                 device->flags.lockable = 1;
 818
 819         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 820         status = acpi_get_handle(device->handle, "_PS0", &temp);
 821         if (ACPI_FAILURE(status))
 822                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 823         if (ACPI_SUCCESS(status))
 824                 device->flags.power_manageable = 1;
 825
 826         /* Presence of _PRW indicates wake capable */
 827         status = acpi_get_handle(device->handle, "_PRW", &temp);
 828         if (ACPI_SUCCESS(status))
 829                 device->flags.wake_capable = 1;
 830
 831         /* TBD: Peformance management */
 832
 833         return 0;
 834 }
 835
 836 static void acpi_device_get_busid(struct acpi_device *device,
 837                                   acpi_handle handle, int type)
 838 {
 839         char bus_id[5] = { '?', 0 };
 840         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 841         int i = 0;
 842
 843         /*
 844          * Bus ID
 845          * ------
 846          * The device's Bus ID is simply the object name.
 847          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 848          */
 849         switch (type) {
 850         case ACPI_BUS_TYPE_SYSTEM:
 851                 strcpy(device->pnp.bus_id, "ACPI");
 852                 break;
 853         case ACPI_BUS_TYPE_POWER_BUTTON:
 854                 strcpy(device->pnp.bus_id, "PWRF");
 855                 break;
 856         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 857                 strcpy(device->pnp.bus_id, "SLPF");
 858                 break;
 859         default:
 860                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 861                 /* Clean up trailing underscores (if any) */
 862                 for (i = 3; i > 1; i--) {
 863                         if (bus_id[i] == '_')
 864                                 bus_id[i] = '\0';
 865                         else
 866                                 break;
 867                 }
 868                 strcpy(device->pnp.bus_id, bus_id);
 869                 break;
 870         }
 871 }
 872
 873 static int
 874 acpi_video_bus_match(struct acpi_device *device)
 875 {
 876         acpi_handle h_dummy1;
 877         acpi_handle h_dummy2;
 878         acpi_handle h_dummy3;
 879
 880
 881         if (!device)
 882                 return -EINVAL;
 883
 884         /* Since there is no HID, CID for ACPI Video drivers, we have
 885          * to check well known required nodes for each feature we support.
 886          */
 887
 888         /* Does this device able to support video switching ? */
 889         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
 890             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
 891                 return 0;
 892
 893         /* Does this device able to retrieve a video ROM ? */
 894         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
 895                 return 0;
 896
 897         /* Does this device able to configure which video head to be POSTed ? */
 898         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
 899             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
 900             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
 901                 return 0;
 902
 903         return -ENODEV;
 904 }
 905
 906 /*
 907  * acpi_bay_match - see if a device is an ejectable driver bay
 908  *
 909  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 910  * then we can safely call it an ejectable drive bay
 911  */
 912 static int acpi_bay_match(struct acpi_device *device){
 913         acpi_status status;
 914         acpi_handle handle;
 915         acpi_handle tmp;
 916         acpi_handle phandle;
 917
 918         handle = device->handle;
 919
 920         status = acpi_get_handle(handle, "_EJ0", &tmp);
 921         if (ACPI_FAILURE(status))
 922                 return -ENODEV;
 923
 924         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 925                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 926                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 927                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 928                 return 0;
 929
 930         if (acpi_get_parent(handle, &phandle))
 931                 return -ENODEV;
 932
 933         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 934                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 935                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 936                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 937                 return 0;
 938
 939         return -ENODEV;
 940 }
 941
 942 static void acpi_device_set_id(struct acpi_device *device,
 943                                struct acpi_device *parent, acpi_handle handle,
 944                                int type)
 945 {
 946         struct acpi_device_info *info;
 947         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 948         char *hid = NULL;
 949         char *uid = NULL;
 950         struct acpi_compatible_id_list *cid_list = NULL;
 951         acpi_status status;
 952
 953         switch (type) {
 954         case ACPI_BUS_TYPE_DEVICE:
 955                 status = acpi_get_object_info(handle, &buffer);
 956                 if (ACPI_FAILURE(status)) {
 957                         printk("%s: Error reading device info\n", __FUNCTION__);
 958                         return;
 959                 }
 960
 961                 info = buffer.pointer;
 962                 if (info->valid & ACPI_VALID_HID)
 963                         hid = info->hardware_id.value;
 964                 if (info->valid & ACPI_VALID_UID)
 965                         uid = info->unique_id.value;
 966                 if (info->valid & ACPI_VALID_CID)
 967                         cid_list = &info->compatibility_id;
 968                 if (info->valid & ACPI_VALID_ADR) {
 969                         device->pnp.bus_address = info->address;
 970                         device->flags.bus_address = 1;
 971                 }
 972
 973                 if(!(info->valid & (ACPI_VALID_HID | ACPI_VALID_CID))){
 974                         status = acpi_video_bus_match(device);
 975                         if(ACPI_SUCCESS(status))
 976                                 hid = ACPI_VIDEO_HID;
 977
 978                         status = acpi_bay_match(device);
 979                         if (ACPI_SUCCESS(status))
 980                                 hid = ACPI_BAY_HID;
 981                 }
 982                 break;
 983         case ACPI_BUS_TYPE_POWER:
 984                 hid = ACPI_POWER_HID;
 985                 break;
 986         case ACPI_BUS_TYPE_PROCESSOR:
 987                 hid = ACPI_PROCESSOR_HID;
 988                 break;
 989         case ACPI_BUS_TYPE_SYSTEM:
 990                 hid = ACPI_SYSTEM_HID;
 991                 break;
 992         case ACPI_BUS_TYPE_THERMAL:
 993                 hid = ACPI_THERMAL_HID;
 994                 break;
 995         case ACPI_BUS_TYPE_POWER_BUTTON:
 996                 hid = ACPI_BUTTON_HID_POWERF;
 997                 break;
 998         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 999                 hid = ACPI_BUTTON_HID_SLEEPF;
1000                 break;
1001         }
1002
1003         /*
1004          * \_SB
1005          * ----
1006          * Fix for the system root bus device -- the only root-level device.
1007          */
1008         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1009                 hid = ACPI_BUS_HID;
1010                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1011                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1012         }
1013
1014         if (hid) {
1015                 strcpy(device->pnp.hardware_id, hid);
1016                 device->flags.hardware_id = 1;
1017         }
1018         if (uid) {
1019                 strcpy(device->pnp.unique_id, uid);
1020                 device->flags.unique_id = 1;
1021         }
1022         if (cid_list) {
1023                 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
1024                 if (device->pnp.cid_list)
1025                         memcpy(device->pnp.cid_list, cid_list, cid_list->size);
1026                 else
1027                         printk(KERN_ERR "Memory allocation error\n");
1028         }
1029
1030         kfree(buffer.pointer);
1031 }
1032
1033 static int acpi_device_set_context(struct acpi_device *device, int type)
1034 {
1035         acpi_status status = AE_OK;
1036         int result = 0;
1037         /*
1038          * Context
1039          * -------
1040          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1041          * resolutions from handle->device very efficient.  Note that we need
1042          * to be careful with fixed-feature devices as they all attach to the
1043          * root object.
1044          */
1045         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1046             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1047                 status = acpi_attach_data(device->handle,
1048                                           acpi_bus_data_handler, device);
1049
1050                 if (ACPI_FAILURE(status)) {
1051                         printk("Error attaching device data\n");
1052                         result = -ENODEV;
1053                 }
1054         }
1055         return result;
1056 }
1057
1058 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1059 {
1060         if (!dev)
1061                 return -EINVAL;
1062
1063         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1064         device_release_driver(&dev->dev);
1065
1066         if (!rmdevice)
1067                 return 0;
1068
1069         /*
1070          * unbind _ADR-Based Devices when hot removal
1071          */
1072         if (dev->flags.bus_address) {
1073                 if ((dev->parent) && (dev->parent->ops.unbind))
1074                         dev->parent->ops.unbind(dev);
1075         }
1076         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1077
1078         return 0;
1079 }
1080
1081 static int
1082 acpi_add_single_object(struct acpi_device **child,
1083                        struct acpi_device *parent, acpi_handle handle, int type,
1084                         struct acpi_bus_ops *ops)
1085 {
1086         int result = 0;
1087         struct acpi_device *device = NULL;
1088
1089
1090         if (!child)
1091                 return -EINVAL;
1092
1093         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1094         if (!device) {
1095                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1096                 return -ENOMEM;
1097         }
1098
1099         device->handle = handle;
1100         device->parent = parent;
1101         device->bus_ops = *ops; /* workround for not call .start */
1102
1103
1104         acpi_device_get_busid(device, handle, type);
1105
1106         /*
1107          * Flags
1108          * -----
1109          * Get prior to calling acpi_bus_get_status() so we know whether
1110          * or not _STA is present.  Note that we only look for object
1111          * handles -- cannot evaluate objects until we know the device is
1112          * present and properly initialized.
1113          */
1114         result = acpi_bus_get_flags(device);
1115         if (result)
1116                 goto end;
1117
1118         /*
1119          * Status
1120          * ------
1121          * See if the device is present.  We always assume that non-Device
1122          * and non-Processor objects (e.g. thermal zones, power resources,
1123          * etc.) are present, functioning, etc. (at least when parent object
1124          * is present).  Note that _STA has a different meaning for some
1125          * objects (e.g. power resources) so we need to be careful how we use
1126          * it.
1127          */
1128         switch (type) {
1129         case ACPI_BUS_TYPE_PROCESSOR:
1130         case ACPI_BUS_TYPE_DEVICE:
1131                 result = acpi_bus_get_status(device);
1132                 if (ACPI_FAILURE(result) || !device->status.present) {
1133                         result = -ENOENT;
1134                         goto end;
1135                 }
1136                 break;
1137         default:
1138                 STRUCT_TO_INT(device->status) =
1139                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1140                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1141                 break;
1142         }
1143
1144         /*
1145          * Initialize Device
1146          * -----------------
1147          * TBD: Synch with Core's enumeration/initialization process.
1148          */
1149
1150         /*
1151          * Hardware ID, Unique ID, & Bus Address
1152          * -------------------------------------
1153          */
1154         acpi_device_set_id(device, parent, handle, type);
1155
1156         /*
1157          * Power Management
1158          * ----------------
1159          */
1160         if (device->flags.power_manageable) {
1161                 result = acpi_bus_get_power_flags(device);
1162                 if (result)
1163                         goto end;
1164         }
1165
1166         /*
1167          * Wakeup device management
1168          *-----------------------
1169          */
1170         if (device->flags.wake_capable) {
1171                 result = acpi_bus_get_wakeup_device_flags(device);
1172                 if (result)
1173                         goto end;
1174         }
1175
1176         /*
1177          * Performance Management
1178          * ----------------------
1179          */
1180         if (device->flags.performance_manageable) {
1181                 result = acpi_bus_get_perf_flags(device);
1182                 if (result)
1183                         goto end;
1184         }
1185
1186         if ((result = acpi_device_set_context(device, type)))
1187                 goto end;
1188
1189         result = acpi_device_register(device, parent);
1190
1191         /*
1192          * Bind _ADR-Based Devices when hot add
1193          */
1194         if (device->flags.bus_address) {
1195                 if (device->parent && device->parent->ops.bind)
1196                         device->parent->ops.bind(device);
1197         }
1198
1199       end:
1200         if (!result)
1201                 *child = device;
1202         else {
1203                 kfree(device->pnp.cid_list);
1204                 kfree(device);
1205         }
1206
1207         return result;
1208 }
1209
1210 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1211 {
1212         acpi_status status = AE_OK;
1213         struct acpi_device *parent = NULL;
1214         struct acpi_device *child = NULL;
1215         acpi_handle phandle = NULL;
1216         acpi_handle chandle = NULL;
1217         acpi_object_type type = 0;
1218         u32 level = 1;
1219
1220
1221         if (!start)
1222                 return -EINVAL;
1223
1224         parent = start;
1225         phandle = start->handle;
1226
1227         /*
1228          * Parse through the ACPI namespace, identify all 'devices', and
1229          * create a new 'struct acpi_device' for each.
1230          */
1231         while ((level > 0) && parent) {
1232
1233                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1234                                               chandle, &chandle);
1235
1236                 /*
1237                  * If this scope is exhausted then move our way back up.
1238                  */
1239                 if (ACPI_FAILURE(status)) {
1240                         level--;
1241                         chandle = phandle;
1242                         acpi_get_parent(phandle, &phandle);
1243                         if (parent->parent)
1244                                 parent = parent->parent;
1245                         continue;
1246                 }
1247
1248                 status = acpi_get_type(chandle, &type);
1249                 if (ACPI_FAILURE(status))
1250                         continue;
1251
1252                 /*
1253                  * If this is a scope object then parse it (depth-first).
1254                  */
1255                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1256                         level++;
1257                         phandle = chandle;
1258                         chandle = NULL;
1259                         continue;
1260                 }
1261
1262                 /*
1263                  * We're only interested in objects that we consider 'devices'.
1264                  */
1265                 switch (type) {
1266                 case ACPI_TYPE_DEVICE:
1267                         type = ACPI_BUS_TYPE_DEVICE;
1268                         break;
1269                 case ACPI_TYPE_PROCESSOR:
1270                         type = ACPI_BUS_TYPE_PROCESSOR;
1271                         break;
1272                 case ACPI_TYPE_THERMAL:
1273                         type = ACPI_BUS_TYPE_THERMAL;
1274                         break;
1275                 case ACPI_TYPE_POWER:
1276                         type = ACPI_BUS_TYPE_POWER;
1277                         break;
1278                 default:
1279                         continue;
1280                 }
1281
1282                 if (ops->acpi_op_add)
1283                         status = acpi_add_single_object(&child, parent,
1284                                 chandle, type, ops);
1285                 else
1286                         status = acpi_bus_get_device(chandle, &child);
1287
1288                 if (ACPI_FAILURE(status))
1289                         continue;
1290
1291                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1292                         status = acpi_start_single_object(child);
1293                         if (ACPI_FAILURE(status))
1294                                 continue;
1295                 }
1296
1297                 /*
1298                  * If the device is present, enabled, and functioning then
1299                  * parse its scope (depth-first).  Note that we need to
1300                  * represent absent devices to facilitate PnP notifications
1301                  * -- but only the subtree head (not all of its children,
1302                  * which will be enumerated when the parent is inserted).
1303                  *
1304                  * TBD: Need notifications and other detection mechanisms
1305                  *      in place before we can fully implement this.
1306                  */
1307                 if (child->status.present) {
1308                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1309                                                       NULL, NULL);
1310                         if (ACPI_SUCCESS(status)) {
1311                                 level++;
1312                                 phandle = chandle;
1313                                 chandle = NULL;
1314                                 parent = child;
1315                         }
1316                 }
1317         }
1318
1319         return 0;
1320 }
1321
1322 int
1323 acpi_bus_add(struct acpi_device **child,
1324              struct acpi_device *parent, acpi_handle handle, int type)
1325 {
1326         int result;
1327         struct acpi_bus_ops ops;
1328
1329         memset(&ops, 0, sizeof(ops));
1330         ops.acpi_op_add = 1;
1331
1332         result = acpi_add_single_object(child, parent, handle, type, &ops);
1333         if (!result)
1334                 result = acpi_bus_scan(*child, &ops);
1335
1336         return result;
1337 }
1338
1339 EXPORT_SYMBOL(acpi_bus_add);
1340
1341 int acpi_bus_start(struct acpi_device *device)
1342 {
1343         int result;
1344         struct acpi_bus_ops ops;
1345
1346
1347         if (!device)
1348                 return -EINVAL;
1349
1350         result = acpi_start_single_object(device);
1351         if (!result) {
1352                 memset(&ops, 0, sizeof(ops));
1353                 ops.acpi_op_start = 1;
1354                 result = acpi_bus_scan(device, &ops);
1355         }
1356         return result;
1357 }
1358
1359 EXPORT_SYMBOL(acpi_bus_start);
1360
1361 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1362 {
1363         acpi_status status;
1364         struct acpi_device *parent, *child;
1365         acpi_handle phandle, chandle;
1366         acpi_object_type type;
1367         u32 level = 1;
1368         int err = 0;
1369
1370         parent = start;
1371         phandle = start->handle;
1372         child = chandle = NULL;
1373
1374         while ((level > 0) && parent && (!err)) {
1375                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1376                                               chandle, &chandle);
1377
1378                 /*
1379                  * If this scope is exhausted then move our way back up.
1380                  */
1381                 if (ACPI_FAILURE(status)) {
1382                         level--;
1383                         chandle = phandle;
1384                         acpi_get_parent(phandle, &phandle);
1385                         child = parent;
1386                         parent = parent->parent;
1387
1388                         if (level == 0)
1389                                 err = acpi_bus_remove(child, rmdevice);
1390                         else
1391                                 err = acpi_bus_remove(child, 1);
1392
1393                         continue;
1394                 }
1395
1396                 status = acpi_get_type(chandle, &type);
1397                 if (ACPI_FAILURE(status)) {
1398                         continue;
1399                 }
1400                 /*
1401                  * If there is a device corresponding to chandle then
1402                  * parse it (depth-first).
1403                  */
1404                 if (acpi_bus_get_device(chandle, &child) == 0) {
1405                         level++;
1406                         phandle = chandle;
1407                         chandle = NULL;
1408                         parent = child;
1409                 }
1410                 continue;
1411         }
1412         return err;
1413 }
1414 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1415
1416
1417 static int acpi_bus_scan_fixed(struct acpi_device *root)
1418 {
1419         int result = 0;
1420         struct acpi_device *device = NULL;
1421         struct acpi_bus_ops ops;
1422
1423         if (!root)
1424                 return -ENODEV;
1425
1426         memset(&ops, 0, sizeof(ops));
1427         ops.acpi_op_add = 1;
1428         ops.acpi_op_start = 1;
1429
1430         /*
1431          * Enumerate all fixed-feature devices.
1432          */
1433         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1434                 result = acpi_add_single_object(&device, acpi_root,
1435                                                 NULL,
1436                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1437                                                 &ops);
1438         }
1439
1440         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1441                 result = acpi_add_single_object(&device, acpi_root,
1442                                                 NULL,
1443                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1444                                                 &ops);
1445         }
1446
1447         return result;
1448 }
1449
1450 static int __init acpi_scan_init(void)
1451 {
1452         int result;
1453         struct acpi_bus_ops ops;
1454
1455
1456         if (acpi_disabled)
1457                 return 0;
1458
1459         memset(&ops, 0, sizeof(ops));
1460         ops.acpi_op_add = 1;
1461         ops.acpi_op_start = 1;
1462
1463         result = bus_register(&acpi_bus_type);
1464         if (result) {
1465                 /* We don't want to quit even if we failed to add suspend/resume */
1466                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1467         }
1468
1469         /*
1470          * Create the root device in the bus's device tree
1471          */
1472         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1473                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1474         if (result)
1475                 goto Done;
1476
1477         /*
1478          * Enumerate devices in the ACPI namespace.
1479          */
1480         result = acpi_bus_scan_fixed(acpi_root);
1481         if (!result)
1482                 result = acpi_bus_scan(acpi_root, &ops);
1483
1484         if (result)
1485                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1486
1487       Done:
1488         return result;
1489 }
1490
1491 subsys_initcall(acpi_scan_init);