git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/scan.c

   1 /*
   2  * scan.c - support for transforming the ACPI namespace into individual objects
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/init.h>
   7 #include <linux/kernel.h>
   8 #include <linux/acpi.h>
   9
  10 #include <acpi/acpi_drivers.h>
  11 #include <acpi/acinterp.h>      /* for acpi_ex_eisa_id_to_string() */
  12
  13 #define _COMPONENT              ACPI_BUS_COMPONENT
  14 ACPI_MODULE_NAME("scan");
  15 #define STRUCT_TO_INT(s)        (*((int*)&s))
  16 extern struct acpi_device *acpi_root;
  17
  18 #define ACPI_BUS_CLASS                  "system_bus"
  19 #define ACPI_BUS_HID                    "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         int count;
  43
  44         if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
  45                 return -ENODEV;
  46
  47         len = snprintf(modalias, size, "acpi:");
  48         size -= len;
  49
  50         if (acpi_dev->flags.hardware_id) {
  51                 count = snprintf(&modalias[len], size, "%s:",
  52                                  acpi_dev->pnp.hardware_id);
  53                 if (count < 0 || count >= size)
  54                         return -EINVAL;
  55                 len += count;
  56                 size -= count;
  57         }
  58
  59         if (acpi_dev->flags.compatible_ids) {
  60                 struct acpi_compatible_id_list *cid_list;
  61                 int i;
  62
  63                 cid_list = acpi_dev->pnp.cid_list;
  64                 for (i = 0; i < cid_list->count; i++) {
  65                         count = snprintf(&modalias[len], size, "%s:",
  66                                          cid_list->id[i].value);
  67                         if (count < 0 || count >= size) {
  68                                 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
  69                                        acpi_dev->pnp.device_name, i);
  70                                 break;
  71                         }
  72                         len += count;
  73                         size -= count;
  74                 }
  75         }
  76
  77         modalias[len] = '\0';
  78         return len;
  79 }
  80
  81 static ssize_t
  82 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  83         struct acpi_device *acpi_dev = to_acpi_device(dev);
  84         int len;
  85
  86         /* Device has no HID and no CID or string is >1024 */
  87         len = create_modalias(acpi_dev, buf, 1024);
  88         if (len <= 0)
  89                 return 0;
  90         buf[len++] = '\n';
  91         return len;
  92 }
  93 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  94
  95 static int acpi_eject_operation(acpi_handle handle, int lockable)
  96 {
  97         struct acpi_object_list arg_list;
  98         union acpi_object arg;
  99         acpi_status status = AE_OK;
 100
 101         /*
 102          * TBD: evaluate _PS3?
 103          */
 104
 105         if (lockable) {
 106                 arg_list.count = 1;
 107                 arg_list.pointer = &arg;
 108                 arg.type = ACPI_TYPE_INTEGER;
 109                 arg.integer.value = 0;
 110                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 111         }
 112
 113         arg_list.count = 1;
 114         arg_list.pointer = &arg;
 115         arg.type = ACPI_TYPE_INTEGER;
 116         arg.integer.value = 1;
 117
 118         /*
 119          * TBD: _EJD support.
 120          */
 121
 122         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 123         if (ACPI_FAILURE(status)) {
 124                 return (-ENODEV);
 125         }
 126
 127         return (0);
 128 }
 129
 130 static ssize_t
 131 acpi_eject_store(struct device *d, struct device_attribute *attr,
 132                 const char *buf, size_t count)
 133 {
 134         int result;
 135         int ret = count;
 136         int islockable;
 137         acpi_status status;
 138         acpi_handle handle;
 139         acpi_object_type type = 0;
 140         struct acpi_device *acpi_device = to_acpi_device(d);
 141
 142         if ((!count) || (buf[0] != '1')) {
 143                 return -EINVAL;
 144         }
 145 #ifndef FORCE_EJECT
 146         if (acpi_device->driver == NULL) {
 147                 ret = -ENODEV;
 148                 goto err;
 149         }
 150 #endif
 151         status = acpi_get_type(acpi_device->handle, &type);
 152         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 153                 ret = -ENODEV;
 154                 goto err;
 155         }
 156
 157         islockable = acpi_device->flags.lockable;
 158         handle = acpi_device->handle;
 159
 160         result = acpi_bus_trim(acpi_device, 1);
 161
 162         if (!result)
 163                 result = acpi_eject_operation(handle, islockable);
 164
 165         if (result) {
 166                 ret = -EBUSY;
 167         }
 168       err:
 169         return ret;
 170 }
 171
 172 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 173
 174 static ssize_t
 175 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 176         struct acpi_device *acpi_dev = to_acpi_device(dev);
 177
 178         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
 179 }
 180 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 181
 182 static ssize_t
 183 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 184         struct acpi_device *acpi_dev = to_acpi_device(dev);
 185         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 186         int result;
 187
 188         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 189         if(result)
 190                 goto end;
 191
 192         result = sprintf(buf, "%s\n", (char*)path.pointer);
 193         kfree(path.pointer);
 194   end:
 195         return result;
 196 }
 197 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 198
 199 static int acpi_device_setup_files(struct acpi_device *dev)
 200 {
 201         acpi_status status;
 202         acpi_handle temp;
 203         int result = 0;
 204
 205         /*
 206          * Devices gotten from FADT don't have a "path" attribute
 207          */
 208         if(dev->handle) {
 209                 result = device_create_file(&dev->dev, &dev_attr_path);
 210                 if(result)
 211                         goto end;
 212         }
 213
 214         if(dev->flags.hardware_id) {
 215                 result = device_create_file(&dev->dev, &dev_attr_hid);
 216                 if(result)
 217                         goto end;
 218         }
 219
 220         if (dev->flags.hardware_id || dev->flags.compatible_ids){
 221                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 222                 if(result)
 223                         goto end;
 224         }
 225
 226         /*
 227          * If device has _EJ0, 'eject' file is created that is used to trigger
 228          * hot-removal function from userland.
 229          */
 230         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 231         if (ACPI_SUCCESS(status))
 232                 result = device_create_file(&dev->dev, &dev_attr_eject);
 233   end:
 234         return result;
 235 }
 236
 237 static void acpi_device_remove_files(struct acpi_device *dev)
 238 {
 239         acpi_status status;
 240         acpi_handle temp;
 241
 242         /*
 243          * If device has _EJ0, 'eject' file is created that is used to trigger
 244          * hot-removal function from userland.
 245          */
 246         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 247         if (ACPI_SUCCESS(status))
 248                 device_remove_file(&dev->dev, &dev_attr_eject);
 249
 250         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 251                 device_remove_file(&dev->dev, &dev_attr_modalias);
 252
 253         if(dev->flags.hardware_id)
 254                 device_remove_file(&dev->dev, &dev_attr_hid);
 255         if(dev->handle)
 256                 device_remove_file(&dev->dev, &dev_attr_path);
 257 }
 258 /* --------------------------------------------------------------------------
 259                         ACPI Bus operations
 260    -------------------------------------------------------------------------- */
 261
 262 int acpi_match_device_ids(struct acpi_device *device,
 263                           const struct acpi_device_id *ids)
 264 {
 265         const struct acpi_device_id *id;
 266
 267         if (device->flags.hardware_id) {
 268                 for (id = ids; id->id[0]; id++) {
 269                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 270                                 return 0;
 271                 }
 272         }
 273
 274         if (device->flags.compatible_ids) {
 275                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 276                 int i;
 277
 278                 for (id = ids; id->id[0]; id++) {
 279                         /* compare multiple _CID entries against driver ids */
 280                         for (i = 0; i < cid_list->count; i++) {
 281                                 if (!strcmp((char*)id->id,
 282                                             cid_list->id[i].value))
 283                                         return 0;
 284                         }
 285                 }
 286         }
 287
 288         return -ENOENT;
 289 }
 290 EXPORT_SYMBOL(acpi_match_device_ids);
 291
 292 static void acpi_device_release(struct device *dev)
 293 {
 294         struct acpi_device *acpi_dev = to_acpi_device(dev);
 295
 296         kfree(acpi_dev->pnp.cid_list);
 297         kfree(acpi_dev);
 298 }
 299
 300 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 301 {
 302         struct acpi_device *acpi_dev = to_acpi_device(dev);
 303         struct acpi_driver *acpi_drv = acpi_dev->driver;
 304
 305         if (acpi_drv && acpi_drv->ops.suspend)
 306                 return acpi_drv->ops.suspend(acpi_dev, state);
 307         return 0;
 308 }
 309
 310 static int acpi_device_resume(struct device *dev)
 311 {
 312         struct acpi_device *acpi_dev = to_acpi_device(dev);
 313         struct acpi_driver *acpi_drv = acpi_dev->driver;
 314
 315         if (acpi_drv && acpi_drv->ops.resume)
 316                 return acpi_drv->ops.resume(acpi_dev);
 317         return 0;
 318 }
 319
 320 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 321 {
 322         struct acpi_device *acpi_dev = to_acpi_device(dev);
 323         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 324
 325         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 326 }
 327
 328 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 329 {
 330         struct acpi_device *acpi_dev = to_acpi_device(dev);
 331         int len;
 332
 333         if (add_uevent_var(env, "MODALIAS="))
 334                 return -ENOMEM;
 335         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 336                               sizeof(env->buf) - env->buflen);
 337         if (len >= (sizeof(env->buf) - env->buflen))
 338                 return -ENOMEM;
 339         env->buflen += len;
 340         return 0;
 341 }
 342
 343 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 344 static int acpi_start_single_object(struct acpi_device *);
 345 static int acpi_device_probe(struct device * dev)
 346 {
 347         struct acpi_device *acpi_dev = to_acpi_device(dev);
 348         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 349         int ret;
 350
 351         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 352         if (!ret) {
 353                 if (acpi_dev->bus_ops.acpi_op_start)
 354                         acpi_start_single_object(acpi_dev);
 355                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 356                         "Found driver [%s] for device [%s]\n",
 357                         acpi_drv->name, acpi_dev->pnp.bus_id));
 358                 get_device(dev);
 359         }
 360         return ret;
 361 }
 362
 363 static int acpi_device_remove(struct device * dev)
 364 {
 365         struct acpi_device *acpi_dev = to_acpi_device(dev);
 366         struct acpi_driver *acpi_drv = acpi_dev->driver;
 367
 368         if (acpi_drv) {
 369                 if (acpi_drv->ops.stop)
 370                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 371                 if (acpi_drv->ops.remove)
 372                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 373         }
 374         acpi_dev->driver = NULL;
 375         acpi_driver_data(dev) = NULL;
 376
 377         put_device(dev);
 378         return 0;
 379 }
 380
 381 static void acpi_device_shutdown(struct device *dev)
 382 {
 383         struct acpi_device *acpi_dev = to_acpi_device(dev);
 384         struct acpi_driver *acpi_drv = acpi_dev->driver;
 385
 386         if (acpi_drv && acpi_drv->ops.shutdown)
 387                 acpi_drv->ops.shutdown(acpi_dev);
 388
 389         return ;
 390 }
 391
 392 struct bus_type acpi_bus_type = {
 393         .name           = "acpi",
 394         .suspend        = acpi_device_suspend,
 395         .resume         = acpi_device_resume,
 396         .shutdown       = acpi_device_shutdown,
 397         .match          = acpi_bus_match,
 398         .probe          = acpi_device_probe,
 399         .remove         = acpi_device_remove,
 400         .uevent         = acpi_device_uevent,
 401 };
 402
 403 static int acpi_device_register(struct acpi_device *device,
 404                                  struct acpi_device *parent)
 405 {
 406         int result;
 407         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 408         int found = 0;
 409         /*
 410          * Linkage
 411          * -------
 412          * Link this device to its parent and siblings.
 413          */
 414         INIT_LIST_HEAD(&device->children);
 415         INIT_LIST_HEAD(&device->node);
 416         INIT_LIST_HEAD(&device->g_list);
 417         INIT_LIST_HEAD(&device->wakeup_list);
 418
 419         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 420         if (!new_bus_id) {
 421                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 422                 return -ENOMEM;
 423         }
 424
 425         spin_lock(&acpi_device_lock);
 426         /*
 427          * Find suitable bus_id and instance number in acpi_bus_id_list
 428          * If failed, create one and link it into acpi_bus_id_list
 429          */
 430         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 431                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 432                         acpi_device_bus_id->instance_no ++;
 433                         found = 1;
 434                         kfree(new_bus_id);
 435                         break;
 436                 }
 437         }
 438         if(!found) {
 439                 acpi_device_bus_id = new_bus_id;
 440                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 441                 acpi_device_bus_id->instance_no = 0;
 442                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 443         }
 444         sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 445
 446         if (device->parent) {
 447                 list_add_tail(&device->node, &device->parent->children);
 448                 list_add_tail(&device->g_list, &device->parent->g_list);
 449         } else
 450                 list_add_tail(&device->g_list, &acpi_device_list);
 451         if (device->wakeup.flags.valid)
 452                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 453         spin_unlock(&acpi_device_lock);
 454
 455         if (device->parent)
 456                 device->dev.parent = &parent->dev;
 457         device->dev.bus = &acpi_bus_type;
 458         device_initialize(&device->dev);
 459         device->dev.release = &acpi_device_release;
 460         result = device_add(&device->dev);
 461         if(result) {
 462                 printk(KERN_ERR PREFIX "Error adding device %s", device->dev.bus_id);
 463                 goto end;
 464         }
 465
 466         result = acpi_device_setup_files(device);
 467         if(result)
 468                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
 469
 470         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 471         return 0;
 472   end:
 473         spin_lock(&acpi_device_lock);
 474         if (device->parent) {
 475                 list_del(&device->node);
 476                 list_del(&device->g_list);
 477         } else
 478                 list_del(&device->g_list);
 479         list_del(&device->wakeup_list);
 480         spin_unlock(&acpi_device_lock);
 481         return result;
 482 }
 483
 484 static void acpi_device_unregister(struct acpi_device *device, int type)
 485 {
 486         spin_lock(&acpi_device_lock);
 487         if (device->parent) {
 488                 list_del(&device->node);
 489                 list_del(&device->g_list);
 490         } else
 491                 list_del(&device->g_list);
 492
 493         list_del(&device->wakeup_list);
 494         spin_unlock(&acpi_device_lock);
 495
 496         acpi_detach_data(device->handle, acpi_bus_data_handler);
 497
 498         acpi_device_remove_files(device);
 499         device_unregister(&device->dev);
 500 }
 501
 502 /* --------------------------------------------------------------------------
 503                                  Driver Management
 504    -------------------------------------------------------------------------- */
 505 /**
 506  * acpi_bus_driver_init - add a device to a driver
 507  * @device: the device to add and initialize
 508  * @driver: driver for the device
 509  *
 510  * Used to initialize a device via its device driver.  Called whenever a
 511  * driver is bound to a device.  Invokes the driver's add() ops.
 512  */
 513 static int
 514 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 515 {
 516         int result = 0;
 517
 518
 519         if (!device || !driver)
 520                 return -EINVAL;
 521
 522         if (!driver->ops.add)
 523                 return -ENOSYS;
 524
 525         result = driver->ops.add(device);
 526         if (result) {
 527                 device->driver = NULL;
 528                 acpi_driver_data(device) = NULL;
 529                 return result;
 530         }
 531
 532         device->driver = driver;
 533
 534         /*
 535          * TBD - Configuration Management: Assign resources to device based
 536          * upon possible configuration and currently allocated resources.
 537          */
 538
 539         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 540                           "Driver successfully bound to device\n"));
 541         return 0;
 542 }
 543
 544 static int acpi_start_single_object(struct acpi_device *device)
 545 {
 546         int result = 0;
 547         struct acpi_driver *driver;
 548
 549
 550         if (!(driver = device->driver))
 551                 return 0;
 552
 553         if (driver->ops.start) {
 554                 result = driver->ops.start(device);
 555                 if (result && driver->ops.remove)
 556                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 557         }
 558
 559         return result;
 560 }
 561
 562 /**
 563  * acpi_bus_register_driver - register a driver with the ACPI bus
 564  * @driver: driver being registered
 565  *
 566  * Registers a driver with the ACPI bus.  Searches the namespace for all
 567  * devices that match the driver's criteria and binds.  Returns zero for
 568  * success or a negative error status for failure.
 569  */
 570 int acpi_bus_register_driver(struct acpi_driver *driver)
 571 {
 572         int ret;
 573
 574         if (acpi_disabled)
 575                 return -ENODEV;
 576         driver->drv.name = driver->name;
 577         driver->drv.bus = &acpi_bus_type;
 578         driver->drv.owner = driver->owner;
 579
 580         ret = driver_register(&driver->drv);
 581         return ret;
 582 }
 583
 584 EXPORT_SYMBOL(acpi_bus_register_driver);
 585
 586 /**
 587  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 588  * @driver: driver to unregister
 589  *
 590  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 591  * devices that match the driver's criteria and unbinds.
 592  */
 593 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 594 {
 595         driver_unregister(&driver->drv);
 596 }
 597
 598 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 599
 600 /* --------------------------------------------------------------------------
 601                                  Device Enumeration
 602    -------------------------------------------------------------------------- */
 603 acpi_status
 604 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 605 {
 606         acpi_status status;
 607         acpi_handle tmp;
 608         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 609         union acpi_object *obj;
 610
 611         status = acpi_get_handle(handle, "_EJD", &tmp);
 612         if (ACPI_FAILURE(status))
 613                 return status;
 614
 615         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 616         if (ACPI_SUCCESS(status)) {
 617                 obj = buffer.pointer;
 618                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 619                                          ejd);
 620                 kfree(buffer.pointer);
 621         }
 622         return status;
 623 }
 624 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 625
 626 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 627 {
 628
 629         /* TBD */
 630
 631         return;
 632 }
 633
 634 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 635 {
 636         device->performance.state = ACPI_STATE_UNKNOWN;
 637         return 0;
 638 }
 639
 640 static acpi_status
 641 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 642                                              union acpi_object *package)
 643 {
 644         int i = 0;
 645         union acpi_object *element = NULL;
 646
 647         if (!device || !package || (package->package.count < 2))
 648                 return AE_BAD_PARAMETER;
 649
 650         element = &(package->package.elements[0]);
 651         if (!element)
 652                 return AE_BAD_PARAMETER;
 653         if (element->type == ACPI_TYPE_PACKAGE) {
 654                 if ((element->package.count < 2) ||
 655                     (element->package.elements[0].type !=
 656                      ACPI_TYPE_LOCAL_REFERENCE)
 657                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 658                         return AE_BAD_DATA;
 659                 device->wakeup.gpe_device =
 660                     element->package.elements[0].reference.handle;
 661                 device->wakeup.gpe_number =
 662                     (u32) element->package.elements[1].integer.value;
 663         } else if (element->type == ACPI_TYPE_INTEGER) {
 664                 device->wakeup.gpe_number = element->integer.value;
 665         } else
 666                 return AE_BAD_DATA;
 667
 668         element = &(package->package.elements[1]);
 669         if (element->type != ACPI_TYPE_INTEGER) {
 670                 return AE_BAD_DATA;
 671         }
 672         device->wakeup.sleep_state = element->integer.value;
 673
 674         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 675                 return AE_NO_MEMORY;
 676         }
 677         device->wakeup.resources.count = package->package.count - 2;
 678         for (i = 0; i < device->wakeup.resources.count; i++) {
 679                 element = &(package->package.elements[i + 2]);
 680                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 681                         return AE_BAD_DATA;
 682
 683                 device->wakeup.resources.handles[i] = element->reference.handle;
 684         }
 685
 686         return AE_OK;
 687 }
 688
 689 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 690 {
 691         acpi_status status = 0;
 692         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 693         union acpi_object *package = NULL;
 694
 695         struct acpi_device_id button_device_ids[] = {
 696                 {"PNP0C0D", 0},
 697                 {"PNP0C0C", 0},
 698                 {"PNP0C0E", 0},
 699                 {"", 0},
 700         };
 701
 702
 703         /* _PRW */
 704         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 705         if (ACPI_FAILURE(status)) {
 706                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 707                 goto end;
 708         }
 709
 710         package = (union acpi_object *)buffer.pointer;
 711         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 712         if (ACPI_FAILURE(status)) {
 713                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 714                 goto end;
 715         }
 716
 717         kfree(buffer.pointer);
 718
 719         device->wakeup.flags.valid = 1;
 720         /* Power button, Lid switch always enable wakeup */
 721         if (!acpi_match_device_ids(device, button_device_ids))
 722                 device->wakeup.flags.run_wake = 1;
 723
 724       end:
 725         if (ACPI_FAILURE(status))
 726                 device->flags.wake_capable = 0;
 727         return 0;
 728 }
 729
 730 static int acpi_bus_get_power_flags(struct acpi_device *device)
 731 {
 732         acpi_status status = 0;
 733         acpi_handle handle = NULL;
 734         u32 i = 0;
 735
 736
 737         /*
 738          * Power Management Flags
 739          */
 740         status = acpi_get_handle(device->handle, "_PSC", &handle);
 741         if (ACPI_SUCCESS(status))
 742                 device->power.flags.explicit_get = 1;
 743         status = acpi_get_handle(device->handle, "_IRC", &handle);
 744         if (ACPI_SUCCESS(status))
 745                 device->power.flags.inrush_current = 1;
 746
 747         /*
 748          * Enumerate supported power management states
 749          */
 750         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 751                 struct acpi_device_power_state *ps = &device->power.states[i];
 752                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 753
 754                 /* Evaluate "_PRx" to se if power resources are referenced */
 755                 acpi_evaluate_reference(device->handle, object_name, NULL,
 756                                         &ps->resources);
 757                 if (ps->resources.count) {
 758                         device->power.flags.power_resources = 1;
 759                         ps->flags.valid = 1;
 760                 }
 761
 762                 /* Evaluate "_PSx" to see if we can do explicit sets */
 763                 object_name[2] = 'S';
 764                 status = acpi_get_handle(device->handle, object_name, &handle);
 765                 if (ACPI_SUCCESS(status)) {
 766                         ps->flags.explicit_set = 1;
 767                         ps->flags.valid = 1;
 768                 }
 769
 770                 /* State is valid if we have some power control */
 771                 if (ps->resources.count || ps->flags.explicit_set)
 772                         ps->flags.valid = 1;
 773
 774                 ps->power = -1; /* Unknown - driver assigned */
 775                 ps->latency = -1;       /* Unknown - driver assigned */
 776         }
 777
 778         /* Set defaults for D0 and D3 states (always valid) */
 779         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 780         device->power.states[ACPI_STATE_D0].power = 100;
 781         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 782         device->power.states[ACPI_STATE_D3].power = 0;
 783
 784         /* TBD: System wake support and resource requirements. */
 785
 786         device->power.state = ACPI_STATE_UNKNOWN;
 787
 788         return 0;
 789 }
 790
 791 static int acpi_bus_get_flags(struct acpi_device *device)
 792 {
 793         acpi_status status = AE_OK;
 794         acpi_handle temp = NULL;
 795
 796
 797         /* Presence of _STA indicates 'dynamic_status' */
 798         status = acpi_get_handle(device->handle, "_STA", &temp);
 799         if (ACPI_SUCCESS(status))
 800                 device->flags.dynamic_status = 1;
 801
 802         /* Presence of _CID indicates 'compatible_ids' */
 803         status = acpi_get_handle(device->handle, "_CID", &temp);
 804         if (ACPI_SUCCESS(status))
 805                 device->flags.compatible_ids = 1;
 806
 807         /* Presence of _RMV indicates 'removable' */
 808         status = acpi_get_handle(device->handle, "_RMV", &temp);
 809         if (ACPI_SUCCESS(status))
 810                 device->flags.removable = 1;
 811
 812         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 813         status = acpi_get_handle(device->handle, "_EJD", &temp);
 814         if (ACPI_SUCCESS(status))
 815                 device->flags.ejectable = 1;
 816         else {
 817                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 818                 if (ACPI_SUCCESS(status))
 819                         device->flags.ejectable = 1;
 820         }
 821
 822         /* Presence of _LCK indicates 'lockable' */
 823         status = acpi_get_handle(device->handle, "_LCK", &temp);
 824         if (ACPI_SUCCESS(status))
 825                 device->flags.lockable = 1;
 826
 827         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 828         status = acpi_get_handle(device->handle, "_PS0", &temp);
 829         if (ACPI_FAILURE(status))
 830                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 831         if (ACPI_SUCCESS(status))
 832                 device->flags.power_manageable = 1;
 833
 834         /* Presence of _PRW indicates wake capable */
 835         status = acpi_get_handle(device->handle, "_PRW", &temp);
 836         if (ACPI_SUCCESS(status))
 837                 device->flags.wake_capable = 1;
 838
 839         /* TBD: Performance management */
 840
 841         return 0;
 842 }
 843
 844 static void acpi_device_get_busid(struct acpi_device *device,
 845                                   acpi_handle handle, int type)
 846 {
 847         char bus_id[5] = { '?', 0 };
 848         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 849         int i = 0;
 850
 851         /*
 852          * Bus ID
 853          * ------
 854          * The device's Bus ID is simply the object name.
 855          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 856          */
 857         switch (type) {
 858         case ACPI_BUS_TYPE_SYSTEM:
 859                 strcpy(device->pnp.bus_id, "ACPI");
 860                 break;
 861         case ACPI_BUS_TYPE_POWER_BUTTON:
 862                 strcpy(device->pnp.bus_id, "PWRF");
 863                 break;
 864         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 865                 strcpy(device->pnp.bus_id, "SLPF");
 866                 break;
 867         default:
 868                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 869                 /* Clean up trailing underscores (if any) */
 870                 for (i = 3; i > 1; i--) {
 871                         if (bus_id[i] == '_')
 872                                 bus_id[i] = '\0';
 873                         else
 874                                 break;
 875                 }
 876                 strcpy(device->pnp.bus_id, bus_id);
 877                 break;
 878         }
 879 }
 880
 881 static int
 882 acpi_video_bus_match(struct acpi_device *device)
 883 {
 884         acpi_handle h_dummy1;
 885         acpi_handle h_dummy2;
 886         acpi_handle h_dummy3;
 887
 888
 889         if (!device)
 890                 return -EINVAL;
 891
 892         /* Since there is no HID, CID for ACPI Video drivers, we have
 893          * to check well known required nodes for each feature we support.
 894          */
 895
 896         /* Does this device able to support video switching ? */
 897         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
 898             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
 899                 return 0;
 900
 901         /* Does this device able to retrieve a video ROM ? */
 902         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
 903                 return 0;
 904
 905         /* Does this device able to configure which video head to be POSTed ? */
 906         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
 907             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
 908             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
 909                 return 0;
 910
 911         return -ENODEV;
 912 }
 913
 914 /*
 915  * acpi_bay_match - see if a device is an ejectable driver bay
 916  *
 917  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 918  * then we can safely call it an ejectable drive bay
 919  */
 920 static int acpi_bay_match(struct acpi_device *device){
 921         acpi_status status;
 922         acpi_handle handle;
 923         acpi_handle tmp;
 924         acpi_handle phandle;
 925
 926         handle = device->handle;
 927
 928         status = acpi_get_handle(handle, "_EJ0", &tmp);
 929         if (ACPI_FAILURE(status))
 930                 return -ENODEV;
 931
 932         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 933                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 934                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 935                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 936                 return 0;
 937
 938         if (acpi_get_parent(handle, &phandle))
 939                 return -ENODEV;
 940
 941         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 942                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 943                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 944                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 945                 return 0;
 946
 947         return -ENODEV;
 948 }
 949
 950 /*
 951  * acpi_dock_match - see if a device has a _DCK method
 952  */
 953 static int acpi_dock_match(struct acpi_device *device)
 954 {
 955         acpi_handle tmp;
 956         return acpi_get_handle(device->handle, "_DCK", &tmp);
 957 }
 958
 959 static void acpi_device_set_id(struct acpi_device *device,
 960                                struct acpi_device *parent, acpi_handle handle,
 961                                int type)
 962 {
 963         struct acpi_device_info *info;
 964         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 965         char *hid = NULL;
 966         char *uid = NULL;
 967         struct acpi_compatible_id_list *cid_list = NULL;
 968         const char *cid_add = NULL;
 969         acpi_status status;
 970
 971         switch (type) {
 972         case ACPI_BUS_TYPE_DEVICE:
 973                 status = acpi_get_object_info(handle, &buffer);
 974                 if (ACPI_FAILURE(status)) {
 975                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
 976                         return;
 977                 }
 978
 979                 info = buffer.pointer;
 980                 if (info->valid & ACPI_VALID_HID)
 981                         hid = info->hardware_id.value;
 982                 if (info->valid & ACPI_VALID_UID)
 983                         uid = info->unique_id.value;
 984                 if (info->valid & ACPI_VALID_CID)
 985                         cid_list = &info->compatibility_id;
 986                 if (info->valid & ACPI_VALID_ADR) {
 987                         device->pnp.bus_address = info->address;
 988                         device->flags.bus_address = 1;
 989                 }
 990
 991                 /* If we have a video/bay/dock device, add our selfdefined
 992                    HID to the CID list. Like that the video/bay/dock drivers
 993                    will get autoloaded and the device might still match
 994                    against another driver.
 995                 */
 996                 if (ACPI_SUCCESS(acpi_video_bus_match(device)))
 997                         cid_add = ACPI_VIDEO_HID;
 998                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
 999                         cid_add = ACPI_BAY_HID;
1000                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1001                         cid_add = ACPI_DOCK_HID;
1002
1003                 break;
1004         case ACPI_BUS_TYPE_POWER:
1005                 hid = ACPI_POWER_HID;
1006                 break;
1007         case ACPI_BUS_TYPE_PROCESSOR:
1008                 hid = ACPI_PROCESSOR_HID;
1009                 break;
1010         case ACPI_BUS_TYPE_SYSTEM:
1011                 hid = ACPI_SYSTEM_HID;
1012                 break;
1013         case ACPI_BUS_TYPE_THERMAL:
1014                 hid = ACPI_THERMAL_HID;
1015                 break;
1016         case ACPI_BUS_TYPE_POWER_BUTTON:
1017                 hid = ACPI_BUTTON_HID_POWERF;
1018                 break;
1019         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1020                 hid = ACPI_BUTTON_HID_SLEEPF;
1021                 break;
1022         }
1023
1024         /*
1025          * \_SB
1026          * ----
1027          * Fix for the system root bus device -- the only root-level device.
1028          */
1029         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1030                 hid = ACPI_BUS_HID;
1031                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1032                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1033         }
1034
1035         if (hid) {
1036                 strcpy(device->pnp.hardware_id, hid);
1037                 device->flags.hardware_id = 1;
1038         }
1039         if (uid) {
1040                 strcpy(device->pnp.unique_id, uid);
1041                 device->flags.unique_id = 1;
1042         }
1043         if (cid_list || cid_add) {
1044                 struct  acpi_compatible_id_list *list;
1045                 int size = 0;
1046                 int count = 0;
1047
1048                 if (cid_list) {
1049                         size = cid_list->size;
1050                 } else if (cid_add) {
1051                         size = sizeof(struct acpi_compatible_id_list);
1052                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1053                         if (!cid_list) {
1054                                 printk(KERN_ERR "Memory allocation error\n");
1055                                 kfree(buffer.pointer);
1056                                 return;
1057                         } else {
1058                                 cid_list->count = 0;
1059                                 cid_list->size = size;
1060                         }
1061                 }
1062                 if (cid_add)
1063                         size += sizeof(struct acpi_compatible_id);
1064                 list = kmalloc(size, GFP_KERNEL);
1065
1066                 if (list) {
1067                         if (cid_list) {
1068                                 memcpy(list, cid_list, cid_list->size);
1069                                 count = cid_list->count;
1070                         }
1071                         if (cid_add) {
1072                                 strncpy(list->id[count].value, cid_add,
1073                                         ACPI_MAX_CID_LENGTH);
1074                                 count++;
1075                                 device->flags.compatible_ids = 1;
1076                         }
1077                         list->size = size;
1078                         list->count = count;
1079                         device->pnp.cid_list = list;
1080                 } else
1081                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1082         }
1083
1084         kfree(buffer.pointer);
1085 }
1086
1087 static int acpi_device_set_context(struct acpi_device *device, int type)
1088 {
1089         acpi_status status = AE_OK;
1090         int result = 0;
1091         /*
1092          * Context
1093          * -------
1094          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1095          * resolutions from handle->device very efficient.  Note that we need
1096          * to be careful with fixed-feature devices as they all attach to the
1097          * root object.
1098          */
1099         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1100             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1101                 status = acpi_attach_data(device->handle,
1102                                           acpi_bus_data_handler, device);
1103
1104                 if (ACPI_FAILURE(status)) {
1105                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1106                         result = -ENODEV;
1107                 }
1108         }
1109         return result;
1110 }
1111
1112 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1113 {
1114         if (!dev)
1115                 return -EINVAL;
1116
1117         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1118         device_release_driver(&dev->dev);
1119
1120         if (!rmdevice)
1121                 return 0;
1122
1123         /*
1124          * unbind _ADR-Based Devices when hot removal
1125          */
1126         if (dev->flags.bus_address) {
1127                 if ((dev->parent) && (dev->parent->ops.unbind))
1128                         dev->parent->ops.unbind(dev);
1129         }
1130         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1131
1132         return 0;
1133 }
1134
1135 static int
1136 acpi_is_child_device(struct acpi_device *device,
1137                         int (*matcher)(struct acpi_device *))
1138 {
1139         int result = -ENODEV;
1140
1141         do {
1142                 if (ACPI_SUCCESS(matcher(device)))
1143                         return AE_OK;
1144         } while ((device = device->parent));
1145
1146         return result;
1147 }
1148
1149 static int
1150 acpi_add_single_object(struct acpi_device **child,
1151                        struct acpi_device *parent, acpi_handle handle, int type,
1152                         struct acpi_bus_ops *ops)
1153 {
1154         int result = 0;
1155         struct acpi_device *device = NULL;
1156
1157
1158         if (!child)
1159                 return -EINVAL;
1160
1161         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1162         if (!device) {
1163                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1164                 return -ENOMEM;
1165         }
1166
1167         device->handle = handle;
1168         device->parent = parent;
1169         device->bus_ops = *ops; /* workround for not call .start */
1170
1171
1172         acpi_device_get_busid(device, handle, type);
1173
1174         /*
1175          * Flags
1176          * -----
1177          * Get prior to calling acpi_bus_get_status() so we know whether
1178          * or not _STA is present.  Note that we only look for object
1179          * handles -- cannot evaluate objects until we know the device is
1180          * present and properly initialized.
1181          */
1182         result = acpi_bus_get_flags(device);
1183         if (result)
1184                 goto end;
1185
1186         /*
1187          * Status
1188          * ------
1189          * See if the device is present.  We always assume that non-Device
1190          * and non-Processor objects (e.g. thermal zones, power resources,
1191          * etc.) are present, functioning, etc. (at least when parent object
1192          * is present).  Note that _STA has a different meaning for some
1193          * objects (e.g. power resources) so we need to be careful how we use
1194          * it.
1195          */
1196         switch (type) {
1197         case ACPI_BUS_TYPE_PROCESSOR:
1198         case ACPI_BUS_TYPE_DEVICE:
1199                 result = acpi_bus_get_status(device);
1200                 if (ACPI_FAILURE(result)) {
1201                         result = -ENODEV;
1202                         goto end;
1203                 }
1204                 if (!device->status.present) {
1205                         /* Bay and dock should be handled even if absent */
1206                         if (!ACPI_SUCCESS(
1207                              acpi_is_child_device(device, acpi_bay_match)) &&
1208                             !ACPI_SUCCESS(
1209                              acpi_is_child_device(device, acpi_dock_match))) {
1210                                         result = -ENODEV;
1211                                         goto end;
1212                         }
1213                 }
1214                 break;
1215         default:
1216                 STRUCT_TO_INT(device->status) =
1217                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1218                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1219                 break;
1220         }
1221
1222         /*
1223          * Initialize Device
1224          * -----------------
1225          * TBD: Synch with Core's enumeration/initialization process.
1226          */
1227
1228         /*
1229          * Hardware ID, Unique ID, & Bus Address
1230          * -------------------------------------
1231          */
1232         acpi_device_set_id(device, parent, handle, type);
1233
1234         /*
1235          * Power Management
1236          * ----------------
1237          */
1238         if (device->flags.power_manageable) {
1239                 result = acpi_bus_get_power_flags(device);
1240                 if (result)
1241                         goto end;
1242         }
1243
1244         /*
1245          * Wakeup device management
1246          *-----------------------
1247          */
1248         if (device->flags.wake_capable) {
1249                 result = acpi_bus_get_wakeup_device_flags(device);
1250                 if (result)
1251                         goto end;
1252         }
1253
1254         /*
1255          * Performance Management
1256          * ----------------------
1257          */
1258         if (device->flags.performance_manageable) {
1259                 result = acpi_bus_get_perf_flags(device);
1260                 if (result)
1261                         goto end;
1262         }
1263
1264         if ((result = acpi_device_set_context(device, type)))
1265                 goto end;
1266
1267         result = acpi_device_register(device, parent);
1268
1269         /*
1270          * Bind _ADR-Based Devices when hot add
1271          */
1272         if (device->flags.bus_address) {
1273                 if (device->parent && device->parent->ops.bind)
1274                         device->parent->ops.bind(device);
1275         }
1276
1277       end:
1278         if (!result)
1279                 *child = device;
1280         else {
1281                 kfree(device->pnp.cid_list);
1282                 kfree(device);
1283         }
1284
1285         return result;
1286 }
1287
1288 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1289 {
1290         acpi_status status = AE_OK;
1291         struct acpi_device *parent = NULL;
1292         struct acpi_device *child = NULL;
1293         acpi_handle phandle = NULL;
1294         acpi_handle chandle = NULL;
1295         acpi_object_type type = 0;
1296         u32 level = 1;
1297
1298
1299         if (!start)
1300                 return -EINVAL;
1301
1302         parent = start;
1303         phandle = start->handle;
1304
1305         /*
1306          * Parse through the ACPI namespace, identify all 'devices', and
1307          * create a new 'struct acpi_device' for each.
1308          */
1309         while ((level > 0) && parent) {
1310
1311                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1312                                               chandle, &chandle);
1313
1314                 /*
1315                  * If this scope is exhausted then move our way back up.
1316                  */
1317                 if (ACPI_FAILURE(status)) {
1318                         level--;
1319                         chandle = phandle;
1320                         acpi_get_parent(phandle, &phandle);
1321                         if (parent->parent)
1322                                 parent = parent->parent;
1323                         continue;
1324                 }
1325
1326                 status = acpi_get_type(chandle, &type);
1327                 if (ACPI_FAILURE(status))
1328                         continue;
1329
1330                 /*
1331                  * If this is a scope object then parse it (depth-first).
1332                  */
1333                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1334                         level++;
1335                         phandle = chandle;
1336                         chandle = NULL;
1337                         continue;
1338                 }
1339
1340                 /*
1341                  * We're only interested in objects that we consider 'devices'.
1342                  */
1343                 switch (type) {
1344                 case ACPI_TYPE_DEVICE:
1345                         type = ACPI_BUS_TYPE_DEVICE;
1346                         break;
1347                 case ACPI_TYPE_PROCESSOR:
1348                         type = ACPI_BUS_TYPE_PROCESSOR;
1349                         break;
1350                 case ACPI_TYPE_THERMAL:
1351                         type = ACPI_BUS_TYPE_THERMAL;
1352                         break;
1353                 case ACPI_TYPE_POWER:
1354                         type = ACPI_BUS_TYPE_POWER;
1355                         break;
1356                 default:
1357                         continue;
1358                 }
1359
1360                 if (ops->acpi_op_add)
1361                         status = acpi_add_single_object(&child, parent,
1362                                 chandle, type, ops);
1363                 else
1364                         status = acpi_bus_get_device(chandle, &child);
1365
1366                 if (ACPI_FAILURE(status))
1367                         continue;
1368
1369                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1370                         status = acpi_start_single_object(child);
1371                         if (ACPI_FAILURE(status))
1372                                 continue;
1373                 }
1374
1375                 /*
1376                  * If the device is present, enabled, and functioning then
1377                  * parse its scope (depth-first).  Note that we need to
1378                  * represent absent devices to facilitate PnP notifications
1379                  * -- but only the subtree head (not all of its children,
1380                  * which will be enumerated when the parent is inserted).
1381                  *
1382                  * TBD: Need notifications and other detection mechanisms
1383                  *      in place before we can fully implement this.
1384                  */
1385                 if (child->status.present) {
1386                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1387                                                       NULL, NULL);
1388                         if (ACPI_SUCCESS(status)) {
1389                                 level++;
1390                                 phandle = chandle;
1391                                 chandle = NULL;
1392                                 parent = child;
1393                         }
1394                 }
1395         }
1396
1397         return 0;
1398 }
1399
1400 int
1401 acpi_bus_add(struct acpi_device **child,
1402              struct acpi_device *parent, acpi_handle handle, int type)
1403 {
1404         int result;
1405         struct acpi_bus_ops ops;
1406
1407         memset(&ops, 0, sizeof(ops));
1408         ops.acpi_op_add = 1;
1409
1410         result = acpi_add_single_object(child, parent, handle, type, &ops);
1411         if (!result)
1412                 result = acpi_bus_scan(*child, &ops);
1413
1414         return result;
1415 }
1416
1417 EXPORT_SYMBOL(acpi_bus_add);
1418
1419 int acpi_bus_start(struct acpi_device *device)
1420 {
1421         int result;
1422         struct acpi_bus_ops ops;
1423
1424
1425         if (!device)
1426                 return -EINVAL;
1427
1428         result = acpi_start_single_object(device);
1429         if (!result) {
1430                 memset(&ops, 0, sizeof(ops));
1431                 ops.acpi_op_start = 1;
1432                 result = acpi_bus_scan(device, &ops);
1433         }
1434         return result;
1435 }
1436
1437 EXPORT_SYMBOL(acpi_bus_start);
1438
1439 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1440 {
1441         acpi_status status;
1442         struct acpi_device *parent, *child;
1443         acpi_handle phandle, chandle;
1444         acpi_object_type type;
1445         u32 level = 1;
1446         int err = 0;
1447
1448         parent = start;
1449         phandle = start->handle;
1450         child = chandle = NULL;
1451
1452         while ((level > 0) && parent && (!err)) {
1453                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1454                                               chandle, &chandle);
1455
1456                 /*
1457                  * If this scope is exhausted then move our way back up.
1458                  */
1459                 if (ACPI_FAILURE(status)) {
1460                         level--;
1461                         chandle = phandle;
1462                         acpi_get_parent(phandle, &phandle);
1463                         child = parent;
1464                         parent = parent->parent;
1465
1466                         if (level == 0)
1467                                 err = acpi_bus_remove(child, rmdevice);
1468                         else
1469                                 err = acpi_bus_remove(child, 1);
1470
1471                         continue;
1472                 }
1473
1474                 status = acpi_get_type(chandle, &type);
1475                 if (ACPI_FAILURE(status)) {
1476                         continue;
1477                 }
1478                 /*
1479                  * If there is a device corresponding to chandle then
1480                  * parse it (depth-first).
1481                  */
1482                 if (acpi_bus_get_device(chandle, &child) == 0) {
1483                         level++;
1484                         phandle = chandle;
1485                         chandle = NULL;
1486                         parent = child;
1487                 }
1488                 continue;
1489         }
1490         return err;
1491 }
1492 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1493
1494
1495 static int acpi_bus_scan_fixed(struct acpi_device *root)
1496 {
1497         int result = 0;
1498         struct acpi_device *device = NULL;
1499         struct acpi_bus_ops ops;
1500
1501         if (!root)
1502                 return -ENODEV;
1503
1504         memset(&ops, 0, sizeof(ops));
1505         ops.acpi_op_add = 1;
1506         ops.acpi_op_start = 1;
1507
1508         /*
1509          * Enumerate all fixed-feature devices.
1510          */
1511         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1512                 result = acpi_add_single_object(&device, acpi_root,
1513                                                 NULL,
1514                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1515                                                 &ops);
1516         }
1517
1518         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1519                 result = acpi_add_single_object(&device, acpi_root,
1520                                                 NULL,
1521                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1522                                                 &ops);
1523         }
1524
1525         return result;
1526 }
1527
1528 int __init acpi_boot_ec_enable(void);
1529
1530 static int __init acpi_scan_init(void)
1531 {
1532         int result;
1533         struct acpi_bus_ops ops;
1534
1535
1536         if (acpi_disabled)
1537                 return 0;
1538
1539         memset(&ops, 0, sizeof(ops));
1540         ops.acpi_op_add = 1;
1541         ops.acpi_op_start = 1;
1542
1543         result = bus_register(&acpi_bus_type);
1544         if (result) {
1545                 /* We don't want to quit even if we failed to add suspend/resume */
1546                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1547         }
1548
1549         /*
1550          * Create the root device in the bus's device tree
1551          */
1552         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1553                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1554         if (result)
1555                 goto Done;
1556
1557         /*
1558          * Enumerate devices in the ACPI namespace.
1559          */
1560         result = acpi_bus_scan_fixed(acpi_root);
1561
1562         /* EC region might be needed at bus_scan, so enable it now */
1563         acpi_boot_ec_enable();
1564
1565         if (!result)
1566                 result = acpi_bus_scan(acpi_root, &ops);
1567
1568         if (result)
1569                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1570
1571       Done:
1572         return result;
1573 }
1574
1575 subsys_initcall(acpi_scan_init);