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 int create_modalias(struct acpi_device *acpi_dev, char *modalias, int size){
  39
  40         int len;
  41
  42         if (!acpi_dev->flags.hardware_id)
  43                 return -ENODEV;
  44
  45         len = snprintf(modalias, size, "acpi:%s:",
  46                        acpi_dev->pnp.hardware_id);
  47         if (len < 0 || len >= size)
  48                 return -EINVAL;
  49         size -= len;
  50
  51         if (acpi_dev->flags.compatible_ids) {
  52                 struct acpi_compatible_id_list *cid_list;
  53                 int i;
  54                 int count;
  55
  56                 cid_list = acpi_dev->pnp.cid_list;
  57                 for (i = 0; i < cid_list->count; i++) {
  58                         count = snprintf(&modalias[len], size, "%s:",
  59                                          cid_list->id[i].value);
  60                         if (count < 0 || count >= size) {
  61                                 printk(KERN_ERR "acpi: %s cid[%i] exceeds event buffer size",
  62                                        acpi_dev->pnp.device_name, i);
  63                                 break;
  64                         }
  65                         len += count;
  66                         size -= count;
  67                 }
  68         }
  69
  70         modalias[len] = '\0';
  71         return len;
  72 }
  73
  74 static ssize_t
  75 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  76         struct acpi_device *acpi_dev = to_acpi_device(dev);
  77         int len;
  78
  79         /* Device has no HID and no CID or string is >1024 */
  80         len = create_modalias(acpi_dev, buf, 1024);
  81         if (len <= 0)
  82                 return 0;
  83         buf[len++] = '\n';
  84         return len;
  85 }
  86 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  87
  88 static int acpi_eject_operation(acpi_handle handle, int lockable)
  89 {
  90         struct acpi_object_list arg_list;
  91         union acpi_object arg;
  92         acpi_status status = AE_OK;
  93
  94         /*
  95          * TBD: evaluate _PS3?
  96          */
  97
  98         if (lockable) {
  99                 arg_list.count = 1;
 100                 arg_list.pointer = &arg;
 101                 arg.type = ACPI_TYPE_INTEGER;
 102                 arg.integer.value = 0;
 103                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 104         }
 105
 106         arg_list.count = 1;
 107         arg_list.pointer = &arg;
 108         arg.type = ACPI_TYPE_INTEGER;
 109         arg.integer.value = 1;
 110
 111         /*
 112          * TBD: _EJD support.
 113          */
 114
 115         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 116         if (ACPI_FAILURE(status)) {
 117                 return (-ENODEV);
 118         }
 119
 120         return (0);
 121 }
 122
 123 static ssize_t
 124 acpi_eject_store(struct device *d, struct device_attribute *attr,
 125                 const char *buf, size_t count)
 126 {
 127         int result;
 128         int ret = count;
 129         int islockable;
 130         acpi_status status;
 131         acpi_handle handle;
 132         acpi_object_type type = 0;
 133         struct acpi_device *acpi_device = to_acpi_device(d);
 134
 135         if ((!count) || (buf[0] != '1')) {
 136                 return -EINVAL;
 137         }
 138 #ifndef FORCE_EJECT
 139         if (acpi_device->driver == NULL) {
 140                 ret = -ENODEV;
 141                 goto err;
 142         }
 143 #endif
 144         status = acpi_get_type(acpi_device->handle, &type);
 145         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 146                 ret = -ENODEV;
 147                 goto err;
 148         }
 149
 150         islockable = acpi_device->flags.lockable;
 151         handle = acpi_device->handle;
 152
 153         result = acpi_bus_trim(acpi_device, 1);
 154
 155         if (!result)
 156                 result = acpi_eject_operation(handle, islockable);
 157
 158         if (result) {
 159                 ret = -EBUSY;
 160         }
 161       err:
 162         return ret;
 163 }
 164
 165 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 166
 167 static ssize_t
 168 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 169         struct acpi_device *acpi_dev = to_acpi_device(dev);
 170
 171         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
 172 }
 173 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 174
 175 static ssize_t
 176 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 177         struct acpi_device *acpi_dev = to_acpi_device(dev);
 178         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 179         int result;
 180
 181         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 182         if(result)
 183                 goto end;
 184
 185         result = sprintf(buf, "%s\n", (char*)path.pointer);
 186         kfree(path.pointer);
 187   end:
 188         return result;
 189 }
 190 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 191
 192 static int acpi_device_setup_files(struct acpi_device *dev)
 193 {
 194         acpi_status status;
 195         acpi_handle temp;
 196         int result = 0;
 197
 198         /*
 199          * Devices gotten from FADT don't have a "path" attribute
 200          */
 201         if(dev->handle) {
 202                 result = device_create_file(&dev->dev, &dev_attr_path);
 203                 if(result)
 204                         goto end;
 205         }
 206
 207         if(dev->flags.hardware_id) {
 208                 result = device_create_file(&dev->dev, &dev_attr_hid);
 209                 if(result)
 210                         goto end;
 211         }
 212
 213         if (dev->flags.hardware_id || dev->flags.compatible_ids){
 214                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 215                 if(result)
 216                         goto end;
 217         }
 218
 219         /*
 220          * If device has _EJ0, 'eject' file is created that is used to trigger
 221          * hot-removal function from userland.
 222          */
 223         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 224         if (ACPI_SUCCESS(status))
 225                 result = device_create_file(&dev->dev, &dev_attr_eject);
 226   end:
 227         return result;
 228 }
 229
 230 static void acpi_device_remove_files(struct acpi_device *dev)
 231 {
 232         acpi_status status;
 233         acpi_handle temp;
 234
 235         /*
 236          * If device has _EJ0, 'eject' file is created that is used to trigger
 237          * hot-removal function from userland.
 238          */
 239         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 240         if (ACPI_SUCCESS(status))
 241                 device_remove_file(&dev->dev, &dev_attr_eject);
 242
 243         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 244                 device_remove_file(&dev->dev, &dev_attr_modalias);
 245
 246         if(dev->flags.hardware_id)
 247                 device_remove_file(&dev->dev, &dev_attr_hid);
 248         if(dev->handle)
 249                 device_remove_file(&dev->dev, &dev_attr_path);
 250 }
 251 /* --------------------------------------------------------------------------
 252                         ACPI Bus operations
 253    -------------------------------------------------------------------------- */
 254
 255 int acpi_match_device_ids(struct acpi_device *device,
 256                           const struct acpi_device_id *ids)
 257 {
 258         const struct acpi_device_id *id;
 259
 260         if (device->flags.hardware_id) {
 261                 for (id = ids; id->id[0]; id++) {
 262                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 263                                 return 0;
 264                 }
 265         }
 266
 267         if (device->flags.compatible_ids) {
 268                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 269                 int i;
 270
 271                 for (id = ids; id->id[0]; id++) {
 272                         /* compare multiple _CID entries against driver ids */
 273                         for (i = 0; i < cid_list->count; i++) {
 274                                 if (!strcmp((char*)id->id,
 275                                             cid_list->id[i].value))
 276                                         return 0;
 277                         }
 278                 }
 279         }
 280
 281         return -ENOENT;
 282 }
 283 EXPORT_SYMBOL(acpi_match_device_ids);
 284
 285 static void acpi_device_release(struct device *dev)
 286 {
 287         struct acpi_device *acpi_dev = to_acpi_device(dev);
 288
 289         kfree(acpi_dev->pnp.cid_list);
 290         kfree(acpi_dev);
 291 }
 292
 293 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 294 {
 295         struct acpi_device *acpi_dev = to_acpi_device(dev);
 296         struct acpi_driver *acpi_drv = acpi_dev->driver;
 297
 298         if (acpi_drv && acpi_drv->ops.suspend)
 299                 return acpi_drv->ops.suspend(acpi_dev, state);
 300         return 0;
 301 }
 302
 303 static int acpi_device_resume(struct device *dev)
 304 {
 305         struct acpi_device *acpi_dev = to_acpi_device(dev);
 306         struct acpi_driver *acpi_drv = acpi_dev->driver;
 307
 308         if (acpi_drv && acpi_drv->ops.resume)
 309                 return acpi_drv->ops.resume(acpi_dev);
 310         return 0;
 311 }
 312
 313 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 314 {
 315         struct acpi_device *acpi_dev = to_acpi_device(dev);
 316         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 317
 318         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 319 }
 320
 321 static int acpi_device_uevent(struct device *dev, char **envp, int num_envp,
 322                               char *buffer, int buffer_size)
 323 {
 324         struct acpi_device *acpi_dev = to_acpi_device(dev);
 325
 326         strcpy(buffer, "MODALIAS=");
 327         if (create_modalias(acpi_dev, buffer + 9, buffer_size - 9) > 0) {
 328                 envp[0] = buffer;
 329                 envp[1] = NULL;
 330         }
 331         return 0;
 332 }
 333
 334 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 335 static int acpi_start_single_object(struct acpi_device *);
 336 static int acpi_device_probe(struct device * dev)
 337 {
 338         struct acpi_device *acpi_dev = to_acpi_device(dev);
 339         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 340         int ret;
 341
 342         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 343         if (!ret) {
 344                 if (acpi_dev->bus_ops.acpi_op_start)
 345                         acpi_start_single_object(acpi_dev);
 346                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 347                         "Found driver [%s] for device [%s]\n",
 348                         acpi_drv->name, acpi_dev->pnp.bus_id));
 349                 get_device(dev);
 350         }
 351         return ret;
 352 }
 353
 354 static int acpi_device_remove(struct device * dev)
 355 {
 356         struct acpi_device *acpi_dev = to_acpi_device(dev);
 357         struct acpi_driver *acpi_drv = acpi_dev->driver;
 358
 359         if (acpi_drv) {
 360                 if (acpi_drv->ops.stop)
 361                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 362                 if (acpi_drv->ops.remove)
 363                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 364         }
 365         acpi_dev->driver = NULL;
 366         acpi_driver_data(dev) = NULL;
 367
 368         put_device(dev);
 369         return 0;
 370 }
 371
 372 static void acpi_device_shutdown(struct device *dev)
 373 {
 374         struct acpi_device *acpi_dev = to_acpi_device(dev);
 375         struct acpi_driver *acpi_drv = acpi_dev->driver;
 376
 377         if (acpi_drv && acpi_drv->ops.shutdown)
 378                 acpi_drv->ops.shutdown(acpi_dev);
 379
 380         return ;
 381 }
 382
 383 struct bus_type acpi_bus_type = {
 384         .name           = "acpi",
 385         .suspend        = acpi_device_suspend,
 386         .resume         = acpi_device_resume,
 387         .shutdown       = acpi_device_shutdown,
 388         .match          = acpi_bus_match,
 389         .probe          = acpi_device_probe,
 390         .remove         = acpi_device_remove,
 391         .uevent         = acpi_device_uevent,
 392 };
 393
 394 static int acpi_device_register(struct acpi_device *device,
 395                                  struct acpi_device *parent)
 396 {
 397         int result;
 398         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 399         int found = 0;
 400         /*
 401          * Linkage
 402          * -------
 403          * Link this device to its parent and siblings.
 404          */
 405         INIT_LIST_HEAD(&device->children);
 406         INIT_LIST_HEAD(&device->node);
 407         INIT_LIST_HEAD(&device->g_list);
 408         INIT_LIST_HEAD(&device->wakeup_list);
 409
 410         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 411         if (!new_bus_id) {
 412                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 413                 return -ENOMEM;
 414         }
 415
 416         spin_lock(&acpi_device_lock);
 417         /*
 418          * Find suitable bus_id and instance number in acpi_bus_id_list
 419          * If failed, create one and link it into acpi_bus_id_list
 420          */
 421         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 422                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 423                         acpi_device_bus_id->instance_no ++;
 424                         found = 1;
 425                         kfree(new_bus_id);
 426                         break;
 427                 }
 428         }
 429         if(!found) {
 430                 acpi_device_bus_id = new_bus_id;
 431                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 432                 acpi_device_bus_id->instance_no = 0;
 433                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 434         }
 435         sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 436
 437         if (device->parent) {
 438                 list_add_tail(&device->node, &device->parent->children);
 439                 list_add_tail(&device->g_list, &device->parent->g_list);
 440         } else
 441                 list_add_tail(&device->g_list, &acpi_device_list);
 442         if (device->wakeup.flags.valid)
 443                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 444         spin_unlock(&acpi_device_lock);
 445
 446         if (device->parent)
 447                 device->dev.parent = &parent->dev;
 448         device->dev.bus = &acpi_bus_type;
 449         device_initialize(&device->dev);
 450         device->dev.release = &acpi_device_release;
 451         result = device_add(&device->dev);
 452         if(result) {
 453                 printk("Error adding device %s", device->dev.bus_id);
 454                 goto end;
 455         }
 456
 457         result = acpi_device_setup_files(device);
 458         if(result)
 459                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
 460
 461         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 462         return 0;
 463   end:
 464         spin_lock(&acpi_device_lock);
 465         if (device->parent) {
 466                 list_del(&device->node);
 467                 list_del(&device->g_list);
 468         } else
 469                 list_del(&device->g_list);
 470         list_del(&device->wakeup_list);
 471         spin_unlock(&acpi_device_lock);
 472         return result;
 473 }
 474
 475 static void acpi_device_unregister(struct acpi_device *device, int type)
 476 {
 477         spin_lock(&acpi_device_lock);
 478         if (device->parent) {
 479                 list_del(&device->node);
 480                 list_del(&device->g_list);
 481         } else
 482                 list_del(&device->g_list);
 483
 484         list_del(&device->wakeup_list);
 485         spin_unlock(&acpi_device_lock);
 486
 487         acpi_detach_data(device->handle, acpi_bus_data_handler);
 488
 489         acpi_device_remove_files(device);
 490         device_unregister(&device->dev);
 491 }
 492
 493 /* --------------------------------------------------------------------------
 494                                  Driver Management
 495    -------------------------------------------------------------------------- */
 496 /**
 497  * acpi_bus_driver_init - add a device to a driver
 498  * @device: the device to add and initialize
 499  * @driver: driver for the device
 500  *
 501  * Used to initialize a device via its device driver.  Called whenever a
 502  * driver is bound to a device.  Invokes the driver's add() ops.
 503  */
 504 static int
 505 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 506 {
 507         int result = 0;
 508
 509
 510         if (!device || !driver)
 511                 return -EINVAL;
 512
 513         if (!driver->ops.add)
 514                 return -ENOSYS;
 515
 516         result = driver->ops.add(device);
 517         if (result) {
 518                 device->driver = NULL;
 519                 acpi_driver_data(device) = NULL;
 520                 return result;
 521         }
 522
 523         device->driver = driver;
 524
 525         /*
 526          * TBD - Configuration Management: Assign resources to device based
 527          * upon possible configuration and currently allocated resources.
 528          */
 529
 530         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 531                           "Driver successfully bound to device\n"));
 532         return 0;
 533 }
 534
 535 static int acpi_start_single_object(struct acpi_device *device)
 536 {
 537         int result = 0;
 538         struct acpi_driver *driver;
 539
 540
 541         if (!(driver = device->driver))
 542                 return 0;
 543
 544         if (driver->ops.start) {
 545                 result = driver->ops.start(device);
 546                 if (result && driver->ops.remove)
 547                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 548         }
 549
 550         return result;
 551 }
 552
 553 /**
 554  * acpi_bus_register_driver - register a driver with the ACPI bus
 555  * @driver: driver being registered
 556  *
 557  * Registers a driver with the ACPI bus.  Searches the namespace for all
 558  * devices that match the driver's criteria and binds.  Returns zero for
 559  * success or a negative error status for failure.
 560  */
 561 int acpi_bus_register_driver(struct acpi_driver *driver)
 562 {
 563         int ret;
 564
 565         if (acpi_disabled)
 566                 return -ENODEV;
 567         driver->drv.name = driver->name;
 568         driver->drv.bus = &acpi_bus_type;
 569         driver->drv.owner = driver->owner;
 570
 571         ret = driver_register(&driver->drv);
 572         return ret;
 573 }
 574
 575 EXPORT_SYMBOL(acpi_bus_register_driver);
 576
 577 /**
 578  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 579  * @driver: driver to unregister
 580  *
 581  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 582  * devices that match the driver's criteria and unbinds.
 583  */
 584 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 585 {
 586         driver_unregister(&driver->drv);
 587 }
 588
 589 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 590
 591 /* --------------------------------------------------------------------------
 592                                  Device Enumeration
 593    -------------------------------------------------------------------------- */
 594 acpi_status
 595 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 596 {
 597         acpi_status status;
 598         acpi_handle tmp;
 599         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 600         union acpi_object *obj;
 601
 602         status = acpi_get_handle(handle, "_EJD", &tmp);
 603         if (ACPI_FAILURE(status))
 604                 return status;
 605
 606         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 607         if (ACPI_SUCCESS(status)) {
 608                 obj = buffer.pointer;
 609                 status = acpi_get_handle(NULL, obj->string.pointer, ejd);
 610                 kfree(buffer.pointer);
 611         }
 612         return status;
 613 }
 614 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 615
 616 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 617 {
 618
 619         /* TBD */
 620
 621         return;
 622 }
 623
 624 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 625 {
 626         device->performance.state = ACPI_STATE_UNKNOWN;
 627         return 0;
 628 }
 629
 630 static acpi_status
 631 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 632                                              union acpi_object *package)
 633 {
 634         int i = 0;
 635         union acpi_object *element = NULL;
 636
 637         if (!device || !package || (package->package.count < 2))
 638                 return AE_BAD_PARAMETER;
 639
 640         element = &(package->package.elements[0]);
 641         if (!element)
 642                 return AE_BAD_PARAMETER;
 643         if (element->type == ACPI_TYPE_PACKAGE) {
 644                 if ((element->package.count < 2) ||
 645                     (element->package.elements[0].type !=
 646                      ACPI_TYPE_LOCAL_REFERENCE)
 647                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 648                         return AE_BAD_DATA;
 649                 device->wakeup.gpe_device =
 650                     element->package.elements[0].reference.handle;
 651                 device->wakeup.gpe_number =
 652                     (u32) element->package.elements[1].integer.value;
 653         } else if (element->type == ACPI_TYPE_INTEGER) {
 654                 device->wakeup.gpe_number = element->integer.value;
 655         } else
 656                 return AE_BAD_DATA;
 657
 658         element = &(package->package.elements[1]);
 659         if (element->type != ACPI_TYPE_INTEGER) {
 660                 return AE_BAD_DATA;
 661         }
 662         device->wakeup.sleep_state = element->integer.value;
 663
 664         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 665                 return AE_NO_MEMORY;
 666         }
 667         device->wakeup.resources.count = package->package.count - 2;
 668         for (i = 0; i < device->wakeup.resources.count; i++) {
 669                 element = &(package->package.elements[i + 2]);
 670                 if (element->type != ACPI_TYPE_ANY) {
 671                         return AE_BAD_DATA;
 672                 }
 673
 674                 device->wakeup.resources.handles[i] = element->reference.handle;
 675         }
 676
 677         return AE_OK;
 678 }
 679
 680 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 681 {
 682         acpi_status status = 0;
 683         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 684         union acpi_object *package = NULL;
 685
 686         struct acpi_device_id button_device_ids[] = {
 687                 {"PNP0C0D", 0},
 688                 {"PNP0C0C", 0},
 689                 {"PNP0C0E", 0},
 690                 {"", 0},
 691         };
 692
 693
 694         /* _PRW */
 695         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 696         if (ACPI_FAILURE(status)) {
 697                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 698                 goto end;
 699         }
 700
 701         package = (union acpi_object *)buffer.pointer;
 702         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 703         if (ACPI_FAILURE(status)) {
 704                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 705                 goto end;
 706         }
 707
 708         kfree(buffer.pointer);
 709
 710         device->wakeup.flags.valid = 1;
 711         /* Power button, Lid switch always enable wakeup */
 712         if (!acpi_match_device_ids(device, button_device_ids))
 713                 device->wakeup.flags.run_wake = 1;
 714
 715       end:
 716         if (ACPI_FAILURE(status))
 717                 device->flags.wake_capable = 0;
 718         return 0;
 719 }
 720
 721 static int acpi_bus_get_power_flags(struct acpi_device *device)
 722 {
 723         acpi_status status = 0;
 724         acpi_handle handle = NULL;
 725         u32 i = 0;
 726
 727
 728         /*
 729          * Power Management Flags
 730          */
 731         status = acpi_get_handle(device->handle, "_PSC", &handle);
 732         if (ACPI_SUCCESS(status))
 733                 device->power.flags.explicit_get = 1;
 734         status = acpi_get_handle(device->handle, "_IRC", &handle);
 735         if (ACPI_SUCCESS(status))
 736                 device->power.flags.inrush_current = 1;
 737
 738         /*
 739          * Enumerate supported power management states
 740          */
 741         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 742                 struct acpi_device_power_state *ps = &device->power.states[i];
 743                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 744
 745                 /* Evaluate "_PRx" to se if power resources are referenced */
 746                 acpi_evaluate_reference(device->handle, object_name, NULL,
 747                                         &ps->resources);
 748                 if (ps->resources.count) {
 749                         device->power.flags.power_resources = 1;
 750                         ps->flags.valid = 1;
 751                 }
 752
 753                 /* Evaluate "_PSx" to see if we can do explicit sets */
 754                 object_name[2] = 'S';
 755                 status = acpi_get_handle(device->handle, object_name, &handle);
 756                 if (ACPI_SUCCESS(status)) {
 757                         ps->flags.explicit_set = 1;
 758                         ps->flags.valid = 1;
 759                 }
 760
 761                 /* State is valid if we have some power control */
 762                 if (ps->resources.count || ps->flags.explicit_set)
 763                         ps->flags.valid = 1;
 764
 765                 ps->power = -1; /* Unknown - driver assigned */
 766                 ps->latency = -1;       /* Unknown - driver assigned */
 767         }
 768
 769         /* Set defaults for D0 and D3 states (always valid) */
 770         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 771         device->power.states[ACPI_STATE_D0].power = 100;
 772         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 773         device->power.states[ACPI_STATE_D3].power = 0;
 774
 775         /* TBD: System wake support and resource requirements. */
 776
 777         device->power.state = ACPI_STATE_UNKNOWN;
 778
 779         return 0;
 780 }
 781
 782 static int acpi_bus_get_flags(struct acpi_device *device)
 783 {
 784         acpi_status status = AE_OK;
 785         acpi_handle temp = NULL;
 786
 787
 788         /* Presence of _STA indicates 'dynamic_status' */
 789         status = acpi_get_handle(device->handle, "_STA", &temp);
 790         if (ACPI_SUCCESS(status))
 791                 device->flags.dynamic_status = 1;
 792
 793         /* Presence of _CID indicates 'compatible_ids' */
 794         status = acpi_get_handle(device->handle, "_CID", &temp);
 795         if (ACPI_SUCCESS(status))
 796                 device->flags.compatible_ids = 1;
 797
 798         /* Presence of _RMV indicates 'removable' */
 799         status = acpi_get_handle(device->handle, "_RMV", &temp);
 800         if (ACPI_SUCCESS(status))
 801                 device->flags.removable = 1;
 802
 803         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 804         status = acpi_get_handle(device->handle, "_EJD", &temp);
 805         if (ACPI_SUCCESS(status))
 806                 device->flags.ejectable = 1;
 807         else {
 808                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 809                 if (ACPI_SUCCESS(status))
 810                         device->flags.ejectable = 1;
 811         }
 812
 813         /* Presence of _LCK indicates 'lockable' */
 814         status = acpi_get_handle(device->handle, "_LCK", &temp);
 815         if (ACPI_SUCCESS(status))
 816                 device->flags.lockable = 1;
 817
 818         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 819         status = acpi_get_handle(device->handle, "_PS0", &temp);
 820         if (ACPI_FAILURE(status))
 821                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 822         if (ACPI_SUCCESS(status))
 823                 device->flags.power_manageable = 1;
 824
 825         /* Presence of _PRW indicates wake capable */
 826         status = acpi_get_handle(device->handle, "_PRW", &temp);
 827         if (ACPI_SUCCESS(status))
 828                 device->flags.wake_capable = 1;
 829
 830         /* TBD: Peformance management */
 831
 832         return 0;
 833 }
 834
 835 static void acpi_device_get_busid(struct acpi_device *device,
 836                                   acpi_handle handle, int type)
 837 {
 838         char bus_id[5] = { '?', 0 };
 839         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 840         int i = 0;
 841
 842         /*
 843          * Bus ID
 844          * ------
 845          * The device's Bus ID is simply the object name.
 846          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 847          */
 848         switch (type) {
 849         case ACPI_BUS_TYPE_SYSTEM:
 850                 strcpy(device->pnp.bus_id, "ACPI");
 851                 break;
 852         case ACPI_BUS_TYPE_POWER_BUTTON:
 853                 strcpy(device->pnp.bus_id, "PWRF");
 854                 break;
 855         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 856                 strcpy(device->pnp.bus_id, "SLPF");
 857                 break;
 858         default:
 859                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 860                 /* Clean up trailing underscores (if any) */
 861                 for (i = 3; i > 1; i--) {
 862                         if (bus_id[i] == '_')
 863                                 bus_id[i] = '\0';
 864                         else
 865                                 break;
 866                 }
 867                 strcpy(device->pnp.bus_id, bus_id);
 868                 break;
 869         }
 870 }
 871
 872 static int
 873 acpi_video_bus_match(struct acpi_device *device)
 874 {
 875         acpi_handle h_dummy1;
 876         acpi_handle h_dummy2;
 877         acpi_handle h_dummy3;
 878
 879
 880         if (!device)
 881                 return -EINVAL;
 882
 883         /* Since there is no HID, CID for ACPI Video drivers, we have
 884          * to check well known required nodes for each feature we support.
 885          */
 886
 887         /* Does this device able to support video switching ? */
 888         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
 889             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
 890                 return 0;
 891
 892         /* Does this device able to retrieve a video ROM ? */
 893         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
 894                 return 0;
 895
 896         /* Does this device able to configure which video head to be POSTed ? */
 897         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
 898             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
 899             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
 900                 return 0;
 901
 902         return -ENODEV;
 903 }
 904
 905 /*
 906  * acpi_bay_match - see if a device is an ejectable driver bay
 907  *
 908  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 909  * then we can safely call it an ejectable drive bay
 910  */
 911 static int acpi_bay_match(struct acpi_device *device){
 912         acpi_status status;
 913         acpi_handle handle;
 914         acpi_handle tmp;
 915         acpi_handle phandle;
 916
 917         handle = device->handle;
 918
 919         status = acpi_get_handle(handle, "_EJ0", &tmp);
 920         if (ACPI_FAILURE(status))
 921                 return -ENODEV;
 922
 923         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 924                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 925                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 926                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 927                 return 0;
 928
 929         if (acpi_get_parent(handle, &phandle))
 930                 return -ENODEV;
 931
 932         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 933                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 934                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 935                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 936                 return 0;
 937
 938         return -ENODEV;
 939 }
 940
 941 static void acpi_device_set_id(struct acpi_device *device,
 942                                struct acpi_device *parent, acpi_handle handle,
 943                                int type)
 944 {
 945         struct acpi_device_info *info;
 946         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 947         char *hid = NULL;
 948         char *uid = NULL;
 949         struct acpi_compatible_id_list *cid_list = NULL;
 950         acpi_status status;
 951
 952         switch (type) {
 953         case ACPI_BUS_TYPE_DEVICE:
 954                 status = acpi_get_object_info(handle, &buffer);
 955                 if (ACPI_FAILURE(status)) {
 956                         printk("%s: Error reading device info\n", __FUNCTION__);
 957                         return;
 958                 }
 959
 960                 info = buffer.pointer;
 961                 if (info->valid & ACPI_VALID_HID)
 962                         hid = info->hardware_id.value;
 963                 if (info->valid & ACPI_VALID_UID)
 964                         uid = info->unique_id.value;
 965                 if (info->valid & ACPI_VALID_CID)
 966                         cid_list = &info->compatibility_id;
 967                 if (info->valid & ACPI_VALID_ADR) {
 968                         device->pnp.bus_address = info->address;
 969                         device->flags.bus_address = 1;
 970                 }
 971
 972                 if(!(info->valid & (ACPI_VALID_HID | ACPI_VALID_CID))){
 973                         status = acpi_video_bus_match(device);
 974                         if(ACPI_SUCCESS(status))
 975                                 hid = ACPI_VIDEO_HID;
 976
 977                         status = acpi_bay_match(device);
 978                         if (ACPI_SUCCESS(status))
 979                                 hid = ACPI_BAY_HID;
 980                 }
 981                 break;
 982         case ACPI_BUS_TYPE_POWER:
 983                 hid = ACPI_POWER_HID;
 984                 break;
 985         case ACPI_BUS_TYPE_PROCESSOR:
 986                 hid = ACPI_PROCESSOR_HID;
 987                 break;
 988         case ACPI_BUS_TYPE_SYSTEM:
 989                 hid = ACPI_SYSTEM_HID;
 990                 break;
 991         case ACPI_BUS_TYPE_THERMAL:
 992                 hid = ACPI_THERMAL_HID;
 993                 break;
 994         case ACPI_BUS_TYPE_POWER_BUTTON:
 995                 hid = ACPI_BUTTON_HID_POWERF;
 996                 break;
 997         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 998                 hid = ACPI_BUTTON_HID_SLEEPF;
 999                 break;
1000         }
1001
1002         /*
1003          * \_SB
1004          * ----
1005          * Fix for the system root bus device -- the only root-level device.
1006          */
1007         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1008                 hid = ACPI_BUS_HID;
1009                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1010                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1011         }
1012
1013         if (hid) {
1014                 strcpy(device->pnp.hardware_id, hid);
1015                 device->flags.hardware_id = 1;
1016         }
1017         if (uid) {
1018                 strcpy(device->pnp.unique_id, uid);
1019                 device->flags.unique_id = 1;
1020         }
1021         if (cid_list) {
1022                 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
1023                 if (device->pnp.cid_list)
1024                         memcpy(device->pnp.cid_list, cid_list, cid_list->size);
1025                 else
1026                         printk(KERN_ERR "Memory allocation error\n");
1027         }
1028
1029         kfree(buffer.pointer);
1030 }
1031
1032 static int acpi_device_set_context(struct acpi_device *device, int type)
1033 {
1034         acpi_status status = AE_OK;
1035         int result = 0;
1036         /*
1037          * Context
1038          * -------
1039          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1040          * resolutions from handle->device very efficient.  Note that we need
1041          * to be careful with fixed-feature devices as they all attach to the
1042          * root object.
1043          */
1044         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1045             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1046                 status = acpi_attach_data(device->handle,
1047                                           acpi_bus_data_handler, device);
1048
1049                 if (ACPI_FAILURE(status)) {
1050                         printk("Error attaching device data\n");
1051                         result = -ENODEV;
1052                 }
1053         }
1054         return result;
1055 }
1056
1057 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1058 {
1059         if (!dev)
1060                 return -EINVAL;
1061
1062         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1063         device_release_driver(&dev->dev);
1064
1065         if (!rmdevice)
1066                 return 0;
1067
1068         /*
1069          * unbind _ADR-Based Devices when hot removal
1070          */
1071         if (dev->flags.bus_address) {
1072                 if ((dev->parent) && (dev->parent->ops.unbind))
1073                         dev->parent->ops.unbind(dev);
1074         }
1075         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1076
1077         return 0;
1078 }
1079
1080 static int
1081 acpi_add_single_object(struct acpi_device **child,
1082                        struct acpi_device *parent, acpi_handle handle, int type,
1083                         struct acpi_bus_ops *ops)
1084 {
1085         int result = 0;
1086         struct acpi_device *device = NULL;
1087
1088
1089         if (!child)
1090                 return -EINVAL;
1091
1092         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1093         if (!device) {
1094                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1095                 return -ENOMEM;
1096         }
1097
1098         device->handle = handle;
1099         device->parent = parent;
1100         device->bus_ops = *ops; /* workround for not call .start */
1101
1102
1103         acpi_device_get_busid(device, handle, type);
1104
1105         /*
1106          * Flags
1107          * -----
1108          * Get prior to calling acpi_bus_get_status() so we know whether
1109          * or not _STA is present.  Note that we only look for object
1110          * handles -- cannot evaluate objects until we know the device is
1111          * present and properly initialized.
1112          */
1113         result = acpi_bus_get_flags(device);
1114         if (result)
1115                 goto end;
1116
1117         /*
1118          * Status
1119          * ------
1120          * See if the device is present.  We always assume that non-Device
1121          * and non-Processor objects (e.g. thermal zones, power resources,
1122          * etc.) are present, functioning, etc. (at least when parent object
1123          * is present).  Note that _STA has a different meaning for some
1124          * objects (e.g. power resources) so we need to be careful how we use
1125          * it.
1126          */
1127         switch (type) {
1128         case ACPI_BUS_TYPE_PROCESSOR:
1129         case ACPI_BUS_TYPE_DEVICE:
1130                 result = acpi_bus_get_status(device);
1131                 if (ACPI_FAILURE(result) || !device->status.present) {
1132                         result = -ENOENT;
1133                         goto end;
1134                 }
1135                 break;
1136         default:
1137                 STRUCT_TO_INT(device->status) =
1138                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1139                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1140                 break;
1141         }
1142
1143         /*
1144          * Initialize Device
1145          * -----------------
1146          * TBD: Synch with Core's enumeration/initialization process.
1147          */
1148
1149         /*
1150          * Hardware ID, Unique ID, & Bus Address
1151          * -------------------------------------
1152          */
1153         acpi_device_set_id(device, parent, handle, type);
1154
1155         /*
1156          * Power Management
1157          * ----------------
1158          */
1159         if (device->flags.power_manageable) {
1160                 result = acpi_bus_get_power_flags(device);
1161                 if (result)
1162                         goto end;
1163         }
1164
1165         /*
1166          * Wakeup device management
1167          *-----------------------
1168          */
1169         if (device->flags.wake_capable) {
1170                 result = acpi_bus_get_wakeup_device_flags(device);
1171                 if (result)
1172                         goto end;
1173         }
1174
1175         /*
1176          * Performance Management
1177          * ----------------------
1178          */
1179         if (device->flags.performance_manageable) {
1180                 result = acpi_bus_get_perf_flags(device);
1181                 if (result)
1182                         goto end;
1183         }
1184
1185         if ((result = acpi_device_set_context(device, type)))
1186                 goto end;
1187
1188         result = acpi_device_register(device, parent);
1189
1190         /*
1191          * Bind _ADR-Based Devices when hot add
1192          */
1193         if (device->flags.bus_address) {
1194                 if (device->parent && device->parent->ops.bind)
1195                         device->parent->ops.bind(device);
1196         }
1197
1198       end:
1199         if (!result)
1200                 *child = device;
1201         else {
1202                 kfree(device->pnp.cid_list);
1203                 kfree(device);
1204         }
1205
1206         return result;
1207 }
1208
1209 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1210 {
1211         acpi_status status = AE_OK;
1212         struct acpi_device *parent = NULL;
1213         struct acpi_device *child = NULL;
1214         acpi_handle phandle = NULL;
1215         acpi_handle chandle = NULL;
1216         acpi_object_type type = 0;
1217         u32 level = 1;
1218
1219
1220         if (!start)
1221                 return -EINVAL;
1222
1223         parent = start;
1224         phandle = start->handle;
1225
1226         /*
1227          * Parse through the ACPI namespace, identify all 'devices', and
1228          * create a new 'struct acpi_device' for each.
1229          */
1230         while ((level > 0) && parent) {
1231
1232                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1233                                               chandle, &chandle);
1234
1235                 /*
1236                  * If this scope is exhausted then move our way back up.
1237                  */
1238                 if (ACPI_FAILURE(status)) {
1239                         level--;
1240                         chandle = phandle;
1241                         acpi_get_parent(phandle, &phandle);
1242                         if (parent->parent)
1243                                 parent = parent->parent;
1244                         continue;
1245                 }
1246
1247                 status = acpi_get_type(chandle, &type);
1248                 if (ACPI_FAILURE(status))
1249                         continue;
1250
1251                 /*
1252                  * If this is a scope object then parse it (depth-first).
1253                  */
1254                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1255                         level++;
1256                         phandle = chandle;
1257                         chandle = NULL;
1258                         continue;
1259                 }
1260
1261                 /*
1262                  * We're only interested in objects that we consider 'devices'.
1263                  */
1264                 switch (type) {
1265                 case ACPI_TYPE_DEVICE:
1266                         type = ACPI_BUS_TYPE_DEVICE;
1267                         break;
1268                 case ACPI_TYPE_PROCESSOR:
1269                         type = ACPI_BUS_TYPE_PROCESSOR;
1270                         break;
1271                 case ACPI_TYPE_THERMAL:
1272                         type = ACPI_BUS_TYPE_THERMAL;
1273                         break;
1274                 case ACPI_TYPE_POWER:
1275                         type = ACPI_BUS_TYPE_POWER;
1276                         break;
1277                 default:
1278                         continue;
1279                 }
1280
1281                 if (ops->acpi_op_add)
1282                         status = acpi_add_single_object(&child, parent,
1283                                 chandle, type, ops);
1284                 else
1285                         status = acpi_bus_get_device(chandle, &child);
1286
1287                 if (ACPI_FAILURE(status))
1288                         continue;
1289
1290                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1291                         status = acpi_start_single_object(child);
1292                         if (ACPI_FAILURE(status))
1293                                 continue;
1294                 }
1295
1296                 /*
1297                  * If the device is present, enabled, and functioning then
1298                  * parse its scope (depth-first).  Note that we need to
1299                  * represent absent devices to facilitate PnP notifications
1300                  * -- but only the subtree head (not all of its children,
1301                  * which will be enumerated when the parent is inserted).
1302                  *
1303                  * TBD: Need notifications and other detection mechanisms
1304                  *      in place before we can fully implement this.
1305                  */
1306                 if (child->status.present) {
1307                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1308                                                       NULL, NULL);
1309                         if (ACPI_SUCCESS(status)) {
1310                                 level++;
1311                                 phandle = chandle;
1312                                 chandle = NULL;
1313                                 parent = child;
1314                         }
1315                 }
1316         }
1317
1318         return 0;
1319 }
1320
1321 int
1322 acpi_bus_add(struct acpi_device **child,
1323              struct acpi_device *parent, acpi_handle handle, int type)
1324 {
1325         int result;
1326         struct acpi_bus_ops ops;
1327
1328         memset(&ops, 0, sizeof(ops));
1329         ops.acpi_op_add = 1;
1330
1331         result = acpi_add_single_object(child, parent, handle, type, &ops);
1332         if (!result)
1333                 result = acpi_bus_scan(*child, &ops);
1334
1335         return result;
1336 }
1337
1338 EXPORT_SYMBOL(acpi_bus_add);
1339
1340 int acpi_bus_start(struct acpi_device *device)
1341 {
1342         int result;
1343         struct acpi_bus_ops ops;
1344
1345
1346         if (!device)
1347                 return -EINVAL;
1348
1349         result = acpi_start_single_object(device);
1350         if (!result) {
1351                 memset(&ops, 0, sizeof(ops));
1352                 ops.acpi_op_start = 1;
1353                 result = acpi_bus_scan(device, &ops);
1354         }
1355         return result;
1356 }
1357
1358 EXPORT_SYMBOL(acpi_bus_start);
1359
1360 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1361 {
1362         acpi_status status;
1363         struct acpi_device *parent, *child;
1364         acpi_handle phandle, chandle;
1365         acpi_object_type type;
1366         u32 level = 1;
1367         int err = 0;
1368
1369         parent = start;
1370         phandle = start->handle;
1371         child = chandle = NULL;
1372
1373         while ((level > 0) && parent && (!err)) {
1374                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1375                                               chandle, &chandle);
1376
1377                 /*
1378                  * If this scope is exhausted then move our way back up.
1379                  */
1380                 if (ACPI_FAILURE(status)) {
1381                         level--;
1382                         chandle = phandle;
1383                         acpi_get_parent(phandle, &phandle);
1384                         child = parent;
1385                         parent = parent->parent;
1386
1387                         if (level == 0)
1388                                 err = acpi_bus_remove(child, rmdevice);
1389                         else
1390                                 err = acpi_bus_remove(child, 1);
1391
1392                         continue;
1393                 }
1394
1395                 status = acpi_get_type(chandle, &type);
1396                 if (ACPI_FAILURE(status)) {
1397                         continue;
1398                 }
1399                 /*
1400                  * If there is a device corresponding to chandle then
1401                  * parse it (depth-first).
1402                  */
1403                 if (acpi_bus_get_device(chandle, &child) == 0) {
1404                         level++;
1405                         phandle = chandle;
1406                         chandle = NULL;
1407                         parent = child;
1408                 }
1409                 continue;
1410         }
1411         return err;
1412 }
1413 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1414
1415
1416 static int acpi_bus_scan_fixed(struct acpi_device *root)
1417 {
1418         int result = 0;
1419         struct acpi_device *device = NULL;
1420         struct acpi_bus_ops ops;
1421
1422         if (!root)
1423                 return -ENODEV;
1424
1425         memset(&ops, 0, sizeof(ops));
1426         ops.acpi_op_add = 1;
1427         ops.acpi_op_start = 1;
1428
1429         /*
1430          * Enumerate all fixed-feature devices.
1431          */
1432         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1433                 result = acpi_add_single_object(&device, acpi_root,
1434                                                 NULL,
1435                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1436                                                 &ops);
1437         }
1438
1439         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1440                 result = acpi_add_single_object(&device, acpi_root,
1441                                                 NULL,
1442                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1443                                                 &ops);
1444         }
1445
1446         return result;
1447 }
1448
1449 static int __init acpi_scan_init(void)
1450 {
1451         int result;
1452         struct acpi_bus_ops ops;
1453
1454
1455         if (acpi_disabled)
1456                 return 0;
1457
1458         memset(&ops, 0, sizeof(ops));
1459         ops.acpi_op_add = 1;
1460         ops.acpi_op_start = 1;
1461
1462         result = bus_register(&acpi_bus_type);
1463         if (result) {
1464                 /* We don't want to quit even if we failed to add suspend/resume */
1465                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1466         }
1467
1468         /*
1469          * Create the root device in the bus's device tree
1470          */
1471         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1472                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1473         if (result)
1474                 goto Done;
1475
1476         /*
1477          * Enumerate devices in the ACPI namespace.
1478          */
1479         result = acpi_bus_scan_fixed(acpi_root);
1480         if (!result)
1481                 result = acpi_bus_scan(acpi_root, &ops);
1482
1483         if (result)
1484                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1485
1486       Done:
1487         return result;
1488 }
1489
1490 subsys_initcall(acpi_scan_init);