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 #include <linux/signal.h>
  10 #include <linux/kthread.h>
  11
  12 #include <acpi/acpi_drivers.h>
  13
  14 #define _COMPONENT              ACPI_BUS_COMPONENT
  15 ACPI_MODULE_NAME("scan");
  16 #define STRUCT_TO_INT(s)        (*((int*)&s))
  17 extern struct acpi_device *acpi_root;
  18
  19 #define ACPI_BUS_CLASS                  "system_bus"
  20 #define ACPI_BUS_HID                    "LNXSYBUS"
  21 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  22
  23 static LIST_HEAD(acpi_device_list);
  24 static LIST_HEAD(acpi_bus_id_list);
  25 DEFINE_SPINLOCK(acpi_device_lock);
  26 LIST_HEAD(acpi_wakeup_device_list);
  27
  28 struct acpi_device_bus_id{
  29         char bus_id[15];
  30         unsigned int instance_no;
  31         struct list_head node;
  32 };
  33
  34 /*
  35  * Creates hid/cid(s) string needed for modalias and uevent
  36  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  37  * char *modalias: "acpi:IBM0001:ACPI0001"
  38 */
  39 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  40                            int size)
  41 {
  42         int len;
  43         int count;
  44
  45         if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
  46                 return -ENODEV;
  47
  48         len = snprintf(modalias, size, "acpi:");
  49         size -= len;
  50
  51         if (acpi_dev->flags.hardware_id) {
  52                 count = snprintf(&modalias[len], size, "%s:",
  53                                  acpi_dev->pnp.hardware_id);
  54                 if (count < 0 || count >= size)
  55                         return -EINVAL;
  56                 len += count;
  57                 size -= count;
  58         }
  59
  60         if (acpi_dev->flags.compatible_ids) {
  61                 struct acpi_compatible_id_list *cid_list;
  62                 int i;
  63
  64                 cid_list = acpi_dev->pnp.cid_list;
  65                 for (i = 0; i < cid_list->count; i++) {
  66                         count = snprintf(&modalias[len], size, "%s:",
  67                                          cid_list->id[i].value);
  68                         if (count < 0 || count >= size) {
  69                                 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
  70                                        acpi_dev->pnp.device_name, i);
  71                                 break;
  72                         }
  73                         len += count;
  74                         size -= count;
  75                 }
  76         }
  77
  78         modalias[len] = '\0';
  79         return len;
  80 }
  81
  82 static ssize_t
  83 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  84         struct acpi_device *acpi_dev = to_acpi_device(dev);
  85         int len;
  86
  87         /* Device has no HID and no CID or string is >1024 */
  88         len = create_modalias(acpi_dev, buf, 1024);
  89         if (len <= 0)
  90                 return 0;
  91         buf[len++] = '\n';
  92         return len;
  93 }
  94 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  95
  96 static int acpi_bus_hot_remove_device(void *context)
  97 {
  98         struct acpi_device *device;
  99         acpi_handle handle = context;
 100         struct acpi_object_list arg_list;
 101         union acpi_object arg;
 102         acpi_status status = AE_OK;
 103
 104         if (acpi_bus_get_device(handle, &device))
 105                 return 0;
 106
 107         if (!device)
 108                 return 0;
 109
 110         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 111                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 112
 113         if (acpi_bus_trim(device, 1)) {
 114                 printk(KERN_ERR PREFIX
 115                                 "Removing device failed\n");
 116                 return -1;
 117         }
 118
 119         /* power off device */
 120         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 121         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 122                 printk(KERN_WARNING PREFIX
 123                                 "Power-off device failed\n");
 124
 125         if (device->flags.lockable) {
 126                 arg_list.count = 1;
 127                 arg_list.pointer = &arg;
 128                 arg.type = ACPI_TYPE_INTEGER;
 129                 arg.integer.value = 0;
 130                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 131         }
 132
 133         arg_list.count = 1;
 134         arg_list.pointer = &arg;
 135         arg.type = ACPI_TYPE_INTEGER;
 136         arg.integer.value = 1;
 137
 138         /*
 139          * TBD: _EJD support.
 140          */
 141         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 142         if (ACPI_FAILURE(status))
 143                 return -ENODEV;
 144
 145         return 0;
 146 }
 147
 148 static ssize_t
 149 acpi_eject_store(struct device *d, struct device_attribute *attr,
 150                 const char *buf, size_t count)
 151 {
 152         int ret = count;
 153         acpi_status status;
 154         acpi_object_type type = 0;
 155         struct acpi_device *acpi_device = to_acpi_device(d);
 156         struct task_struct *task;
 157
 158         if ((!count) || (buf[0] != '1')) {
 159                 return -EINVAL;
 160         }
 161 #ifndef FORCE_EJECT
 162         if (acpi_device->driver == NULL) {
 163                 ret = -ENODEV;
 164                 goto err;
 165         }
 166 #endif
 167         status = acpi_get_type(acpi_device->handle, &type);
 168         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 169                 ret = -ENODEV;
 170                 goto err;
 171         }
 172
 173         /* remove the device in another thread to fix the deadlock issue */
 174         task = kthread_run(acpi_bus_hot_remove_device,
 175                                 acpi_device->handle, "acpi_hot_remove_device");
 176         if (IS_ERR(task))
 177                 ret = PTR_ERR(task);
 178 err:
 179         return ret;
 180 }
 181
 182 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 183
 184 static ssize_t
 185 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 186         struct acpi_device *acpi_dev = to_acpi_device(dev);
 187
 188         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
 189 }
 190 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 191
 192 static ssize_t
 193 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 194         struct acpi_device *acpi_dev = to_acpi_device(dev);
 195         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 196         int result;
 197
 198         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 199         if(result)
 200                 goto end;
 201
 202         result = sprintf(buf, "%s\n", (char*)path.pointer);
 203         kfree(path.pointer);
 204   end:
 205         return result;
 206 }
 207 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 208
 209 static int acpi_device_setup_files(struct acpi_device *dev)
 210 {
 211         acpi_status status;
 212         acpi_handle temp;
 213         int result = 0;
 214
 215         /*
 216          * Devices gotten from FADT don't have a "path" attribute
 217          */
 218         if(dev->handle) {
 219                 result = device_create_file(&dev->dev, &dev_attr_path);
 220                 if(result)
 221                         goto end;
 222         }
 223
 224         if(dev->flags.hardware_id) {
 225                 result = device_create_file(&dev->dev, &dev_attr_hid);
 226                 if(result)
 227                         goto end;
 228         }
 229
 230         if (dev->flags.hardware_id || dev->flags.compatible_ids){
 231                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 232                 if(result)
 233                         goto end;
 234         }
 235
 236         /*
 237          * If device has _EJ0, 'eject' file is created that is used to trigger
 238          * hot-removal function from userland.
 239          */
 240         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 241         if (ACPI_SUCCESS(status))
 242                 result = device_create_file(&dev->dev, &dev_attr_eject);
 243   end:
 244         return result;
 245 }
 246
 247 static void acpi_device_remove_files(struct acpi_device *dev)
 248 {
 249         acpi_status status;
 250         acpi_handle temp;
 251
 252         /*
 253          * If device has _EJ0, 'eject' file is created that is used to trigger
 254          * hot-removal function from userland.
 255          */
 256         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 257         if (ACPI_SUCCESS(status))
 258                 device_remove_file(&dev->dev, &dev_attr_eject);
 259
 260         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 261                 device_remove_file(&dev->dev, &dev_attr_modalias);
 262
 263         if(dev->flags.hardware_id)
 264                 device_remove_file(&dev->dev, &dev_attr_hid);
 265         if(dev->handle)
 266                 device_remove_file(&dev->dev, &dev_attr_path);
 267 }
 268 /* --------------------------------------------------------------------------
 269                         ACPI Bus operations
 270    -------------------------------------------------------------------------- */
 271
 272 int acpi_match_device_ids(struct acpi_device *device,
 273                           const struct acpi_device_id *ids)
 274 {
 275         const struct acpi_device_id *id;
 276
 277         /*
 278          * If the device is not present, it is unnecessary to load device
 279          * driver for it.
 280          */
 281         if (!device->status.present)
 282                 return -ENODEV;
 283
 284         if (device->flags.hardware_id) {
 285                 for (id = ids; id->id[0]; id++) {
 286                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 287                                 return 0;
 288                 }
 289         }
 290
 291         if (device->flags.compatible_ids) {
 292                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 293                 int i;
 294
 295                 for (id = ids; id->id[0]; id++) {
 296                         /* compare multiple _CID entries against driver ids */
 297                         for (i = 0; i < cid_list->count; i++) {
 298                                 if (!strcmp((char*)id->id,
 299                                             cid_list->id[i].value))
 300                                         return 0;
 301                         }
 302                 }
 303         }
 304
 305         return -ENOENT;
 306 }
 307 EXPORT_SYMBOL(acpi_match_device_ids);
 308
 309 static void acpi_device_release(struct device *dev)
 310 {
 311         struct acpi_device *acpi_dev = to_acpi_device(dev);
 312
 313         kfree(acpi_dev->pnp.cid_list);
 314         kfree(acpi_dev);
 315 }
 316
 317 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 318 {
 319         struct acpi_device *acpi_dev = to_acpi_device(dev);
 320         struct acpi_driver *acpi_drv = acpi_dev->driver;
 321
 322         if (acpi_drv && acpi_drv->ops.suspend)
 323                 return acpi_drv->ops.suspend(acpi_dev, state);
 324         return 0;
 325 }
 326
 327 static int acpi_device_resume(struct device *dev)
 328 {
 329         struct acpi_device *acpi_dev = to_acpi_device(dev);
 330         struct acpi_driver *acpi_drv = acpi_dev->driver;
 331
 332         if (acpi_drv && acpi_drv->ops.resume)
 333                 return acpi_drv->ops.resume(acpi_dev);
 334         return 0;
 335 }
 336
 337 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 338 {
 339         struct acpi_device *acpi_dev = to_acpi_device(dev);
 340         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 341
 342         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 343 }
 344
 345 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 346 {
 347         struct acpi_device *acpi_dev = to_acpi_device(dev);
 348         int len;
 349
 350         if (add_uevent_var(env, "MODALIAS="))
 351                 return -ENOMEM;
 352         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 353                               sizeof(env->buf) - env->buflen);
 354         if (len >= (sizeof(env->buf) - env->buflen))
 355                 return -ENOMEM;
 356         env->buflen += len;
 357         return 0;
 358 }
 359
 360 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 361 static int acpi_start_single_object(struct acpi_device *);
 362 static int acpi_device_probe(struct device * dev)
 363 {
 364         struct acpi_device *acpi_dev = to_acpi_device(dev);
 365         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 366         int ret;
 367
 368         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 369         if (!ret) {
 370                 if (acpi_dev->bus_ops.acpi_op_start)
 371                         acpi_start_single_object(acpi_dev);
 372                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 373                         "Found driver [%s] for device [%s]\n",
 374                         acpi_drv->name, acpi_dev->pnp.bus_id));
 375                 get_device(dev);
 376         }
 377         return ret;
 378 }
 379
 380 static int acpi_device_remove(struct device * dev)
 381 {
 382         struct acpi_device *acpi_dev = to_acpi_device(dev);
 383         struct acpi_driver *acpi_drv = acpi_dev->driver;
 384
 385         if (acpi_drv) {
 386                 if (acpi_drv->ops.stop)
 387                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 388                 if (acpi_drv->ops.remove)
 389                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 390         }
 391         acpi_dev->driver = NULL;
 392         acpi_dev->driver_data = NULL;
 393
 394         put_device(dev);
 395         return 0;
 396 }
 397
 398 static void acpi_device_shutdown(struct device *dev)
 399 {
 400         struct acpi_device *acpi_dev = to_acpi_device(dev);
 401         struct acpi_driver *acpi_drv = acpi_dev->driver;
 402
 403         if (acpi_drv && acpi_drv->ops.shutdown)
 404                 acpi_drv->ops.shutdown(acpi_dev);
 405
 406         return ;
 407 }
 408
 409 struct bus_type acpi_bus_type = {
 410         .name           = "acpi",
 411         .suspend        = acpi_device_suspend,
 412         .resume         = acpi_device_resume,
 413         .shutdown       = acpi_device_shutdown,
 414         .match          = acpi_bus_match,
 415         .probe          = acpi_device_probe,
 416         .remove         = acpi_device_remove,
 417         .uevent         = acpi_device_uevent,
 418 };
 419
 420 static int acpi_device_register(struct acpi_device *device,
 421                                  struct acpi_device *parent)
 422 {
 423         int result;
 424         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 425         int found = 0;
 426         /*
 427          * Linkage
 428          * -------
 429          * Link this device to its parent and siblings.
 430          */
 431         INIT_LIST_HEAD(&device->children);
 432         INIT_LIST_HEAD(&device->node);
 433         INIT_LIST_HEAD(&device->g_list);
 434         INIT_LIST_HEAD(&device->wakeup_list);
 435
 436         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 437         if (!new_bus_id) {
 438                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 439                 return -ENOMEM;
 440         }
 441
 442         spin_lock(&acpi_device_lock);
 443         /*
 444          * Find suitable bus_id and instance number in acpi_bus_id_list
 445          * If failed, create one and link it into acpi_bus_id_list
 446          */
 447         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 448                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 449                         acpi_device_bus_id->instance_no ++;
 450                         found = 1;
 451                         kfree(new_bus_id);
 452                         break;
 453                 }
 454         }
 455         if(!found) {
 456                 acpi_device_bus_id = new_bus_id;
 457                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 458                 acpi_device_bus_id->instance_no = 0;
 459                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 460         }
 461         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 462
 463         if (device->parent) {
 464                 list_add_tail(&device->node, &device->parent->children);
 465                 list_add_tail(&device->g_list, &device->parent->g_list);
 466         } else
 467                 list_add_tail(&device->g_list, &acpi_device_list);
 468         if (device->wakeup.flags.valid)
 469                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 470         spin_unlock(&acpi_device_lock);
 471
 472         if (device->parent)
 473                 device->dev.parent = &parent->dev;
 474         device->dev.bus = &acpi_bus_type;
 475         device_initialize(&device->dev);
 476         device->dev.release = &acpi_device_release;
 477         result = device_add(&device->dev);
 478         if(result) {
 479                 dev_err(&device->dev, "Error adding device\n");
 480                 goto end;
 481         }
 482
 483         result = acpi_device_setup_files(device);
 484         if(result)
 485                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 486                        dev_name(&device->dev));
 487
 488         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 489         return 0;
 490   end:
 491         spin_lock(&acpi_device_lock);
 492         if (device->parent) {
 493                 list_del(&device->node);
 494                 list_del(&device->g_list);
 495         } else
 496                 list_del(&device->g_list);
 497         list_del(&device->wakeup_list);
 498         spin_unlock(&acpi_device_lock);
 499         return result;
 500 }
 501
 502 static void acpi_device_unregister(struct acpi_device *device, int type)
 503 {
 504         spin_lock(&acpi_device_lock);
 505         if (device->parent) {
 506                 list_del(&device->node);
 507                 list_del(&device->g_list);
 508         } else
 509                 list_del(&device->g_list);
 510
 511         list_del(&device->wakeup_list);
 512         spin_unlock(&acpi_device_lock);
 513
 514         acpi_detach_data(device->handle, acpi_bus_data_handler);
 515
 516         acpi_device_remove_files(device);
 517         device_unregister(&device->dev);
 518 }
 519
 520 /* --------------------------------------------------------------------------
 521                                  Driver Management
 522    -------------------------------------------------------------------------- */
 523 /**
 524  * acpi_bus_driver_init - add a device to a driver
 525  * @device: the device to add and initialize
 526  * @driver: driver for the device
 527  *
 528  * Used to initialize a device via its device driver.  Called whenever a
 529  * driver is bound to a device.  Invokes the driver's add() ops.
 530  */
 531 static int
 532 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 533 {
 534         int result = 0;
 535
 536
 537         if (!device || !driver)
 538                 return -EINVAL;
 539
 540         if (!driver->ops.add)
 541                 return -ENOSYS;
 542
 543         result = driver->ops.add(device);
 544         if (result) {
 545                 device->driver = NULL;
 546                 device->driver_data = NULL;
 547                 return result;
 548         }
 549
 550         device->driver = driver;
 551
 552         /*
 553          * TBD - Configuration Management: Assign resources to device based
 554          * upon possible configuration and currently allocated resources.
 555          */
 556
 557         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 558                           "Driver successfully bound to device\n"));
 559         return 0;
 560 }
 561
 562 static int acpi_start_single_object(struct acpi_device *device)
 563 {
 564         int result = 0;
 565         struct acpi_driver *driver;
 566
 567
 568         if (!(driver = device->driver))
 569                 return 0;
 570
 571         if (driver->ops.start) {
 572                 result = driver->ops.start(device);
 573                 if (result && driver->ops.remove)
 574                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 575         }
 576
 577         return result;
 578 }
 579
 580 /**
 581  * acpi_bus_register_driver - register a driver with the ACPI bus
 582  * @driver: driver being registered
 583  *
 584  * Registers a driver with the ACPI bus.  Searches the namespace for all
 585  * devices that match the driver's criteria and binds.  Returns zero for
 586  * success or a negative error status for failure.
 587  */
 588 int acpi_bus_register_driver(struct acpi_driver *driver)
 589 {
 590         int ret;
 591
 592         if (acpi_disabled)
 593                 return -ENODEV;
 594         driver->drv.name = driver->name;
 595         driver->drv.bus = &acpi_bus_type;
 596         driver->drv.owner = driver->owner;
 597
 598         ret = driver_register(&driver->drv);
 599         return ret;
 600 }
 601
 602 EXPORT_SYMBOL(acpi_bus_register_driver);
 603
 604 /**
 605  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 606  * @driver: driver to unregister
 607  *
 608  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 609  * devices that match the driver's criteria and unbinds.
 610  */
 611 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 612 {
 613         driver_unregister(&driver->drv);
 614 }
 615
 616 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 617
 618 /* --------------------------------------------------------------------------
 619                                  Device Enumeration
 620    -------------------------------------------------------------------------- */
 621 acpi_status
 622 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 623 {
 624         acpi_status status;
 625         acpi_handle tmp;
 626         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 627         union acpi_object *obj;
 628
 629         status = acpi_get_handle(handle, "_EJD", &tmp);
 630         if (ACPI_FAILURE(status))
 631                 return status;
 632
 633         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 634         if (ACPI_SUCCESS(status)) {
 635                 obj = buffer.pointer;
 636                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 637                                          ejd);
 638                 kfree(buffer.pointer);
 639         }
 640         return status;
 641 }
 642 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 643
 644 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 645 {
 646
 647         /* TBD */
 648
 649         return;
 650 }
 651
 652 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 653 {
 654         device->performance.state = ACPI_STATE_UNKNOWN;
 655         return 0;
 656 }
 657
 658 static acpi_status
 659 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 660                                              union acpi_object *package)
 661 {
 662         int i = 0;
 663         union acpi_object *element = NULL;
 664
 665         if (!device || !package || (package->package.count < 2))
 666                 return AE_BAD_PARAMETER;
 667
 668         element = &(package->package.elements[0]);
 669         if (!element)
 670                 return AE_BAD_PARAMETER;
 671         if (element->type == ACPI_TYPE_PACKAGE) {
 672                 if ((element->package.count < 2) ||
 673                     (element->package.elements[0].type !=
 674                      ACPI_TYPE_LOCAL_REFERENCE)
 675                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 676                         return AE_BAD_DATA;
 677                 device->wakeup.gpe_device =
 678                     element->package.elements[0].reference.handle;
 679                 device->wakeup.gpe_number =
 680                     (u32) element->package.elements[1].integer.value;
 681         } else if (element->type == ACPI_TYPE_INTEGER) {
 682                 device->wakeup.gpe_number = element->integer.value;
 683         } else
 684                 return AE_BAD_DATA;
 685
 686         element = &(package->package.elements[1]);
 687         if (element->type != ACPI_TYPE_INTEGER) {
 688                 return AE_BAD_DATA;
 689         }
 690         device->wakeup.sleep_state = element->integer.value;
 691
 692         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 693                 return AE_NO_MEMORY;
 694         }
 695         device->wakeup.resources.count = package->package.count - 2;
 696         for (i = 0; i < device->wakeup.resources.count; i++) {
 697                 element = &(package->package.elements[i + 2]);
 698                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 699                         return AE_BAD_DATA;
 700
 701                 device->wakeup.resources.handles[i] = element->reference.handle;
 702         }
 703
 704         return AE_OK;
 705 }
 706
 707 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 708 {
 709         acpi_status status = 0;
 710         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 711         union acpi_object *package = NULL;
 712         int psw_error;
 713
 714         struct acpi_device_id button_device_ids[] = {
 715                 {"PNP0C0D", 0},
 716                 {"PNP0C0C", 0},
 717                 {"PNP0C0E", 0},
 718                 {"", 0},
 719         };
 720
 721         /* _PRW */
 722         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 723         if (ACPI_FAILURE(status)) {
 724                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 725                 goto end;
 726         }
 727
 728         package = (union acpi_object *)buffer.pointer;
 729         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 730         if (ACPI_FAILURE(status)) {
 731                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 732                 goto end;
 733         }
 734
 735         kfree(buffer.pointer);
 736
 737         device->wakeup.flags.valid = 1;
 738         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 739          * system for the ACPI device with the _PRW object.
 740          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 741          * So it is necessary to call _DSW object first. Only when it is not
 742          * present will the _PSW object used.
 743          */
 744         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 745         if (psw_error)
 746                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 747                                 "error in _DSW or _PSW evaluation\n"));
 748
 749         /* Power button, Lid switch always enable wakeup */
 750         if (!acpi_match_device_ids(device, button_device_ids))
 751                 device->wakeup.flags.run_wake = 1;
 752
 753       end:
 754         if (ACPI_FAILURE(status))
 755                 device->flags.wake_capable = 0;
 756         return 0;
 757 }
 758
 759 static int acpi_bus_get_power_flags(struct acpi_device *device)
 760 {
 761         acpi_status status = 0;
 762         acpi_handle handle = NULL;
 763         u32 i = 0;
 764
 765
 766         /*
 767          * Power Management Flags
 768          */
 769         status = acpi_get_handle(device->handle, "_PSC", &handle);
 770         if (ACPI_SUCCESS(status))
 771                 device->power.flags.explicit_get = 1;
 772         status = acpi_get_handle(device->handle, "_IRC", &handle);
 773         if (ACPI_SUCCESS(status))
 774                 device->power.flags.inrush_current = 1;
 775
 776         /*
 777          * Enumerate supported power management states
 778          */
 779         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 780                 struct acpi_device_power_state *ps = &device->power.states[i];
 781                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 782
 783                 /* Evaluate "_PRx" to se if power resources are referenced */
 784                 acpi_evaluate_reference(device->handle, object_name, NULL,
 785                                         &ps->resources);
 786                 if (ps->resources.count) {
 787                         device->power.flags.power_resources = 1;
 788                         ps->flags.valid = 1;
 789                 }
 790
 791                 /* Evaluate "_PSx" to see if we can do explicit sets */
 792                 object_name[2] = 'S';
 793                 status = acpi_get_handle(device->handle, object_name, &handle);
 794                 if (ACPI_SUCCESS(status)) {
 795                         ps->flags.explicit_set = 1;
 796                         ps->flags.valid = 1;
 797                 }
 798
 799                 /* State is valid if we have some power control */
 800                 if (ps->resources.count || ps->flags.explicit_set)
 801                         ps->flags.valid = 1;
 802
 803                 ps->power = -1; /* Unknown - driver assigned */
 804                 ps->latency = -1;       /* Unknown - driver assigned */
 805         }
 806
 807         /* Set defaults for D0 and D3 states (always valid) */
 808         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 809         device->power.states[ACPI_STATE_D0].power = 100;
 810         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 811         device->power.states[ACPI_STATE_D3].power = 0;
 812
 813         /* TBD: System wake support and resource requirements. */
 814
 815         device->power.state = ACPI_STATE_UNKNOWN;
 816         acpi_bus_get_power(device->handle, &(device->power.state));
 817
 818         return 0;
 819 }
 820
 821 static int acpi_bus_get_flags(struct acpi_device *device)
 822 {
 823         acpi_status status = AE_OK;
 824         acpi_handle temp = NULL;
 825
 826
 827         /* Presence of _STA indicates 'dynamic_status' */
 828         status = acpi_get_handle(device->handle, "_STA", &temp);
 829         if (ACPI_SUCCESS(status))
 830                 device->flags.dynamic_status = 1;
 831
 832         /* Presence of _CID indicates 'compatible_ids' */
 833         status = acpi_get_handle(device->handle, "_CID", &temp);
 834         if (ACPI_SUCCESS(status))
 835                 device->flags.compatible_ids = 1;
 836
 837         /* Presence of _RMV indicates 'removable' */
 838         status = acpi_get_handle(device->handle, "_RMV", &temp);
 839         if (ACPI_SUCCESS(status))
 840                 device->flags.removable = 1;
 841
 842         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 843         status = acpi_get_handle(device->handle, "_EJD", &temp);
 844         if (ACPI_SUCCESS(status))
 845                 device->flags.ejectable = 1;
 846         else {
 847                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 848                 if (ACPI_SUCCESS(status))
 849                         device->flags.ejectable = 1;
 850         }
 851
 852         /* Presence of _LCK indicates 'lockable' */
 853         status = acpi_get_handle(device->handle, "_LCK", &temp);
 854         if (ACPI_SUCCESS(status))
 855                 device->flags.lockable = 1;
 856
 857         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 858         status = acpi_get_handle(device->handle, "_PS0", &temp);
 859         if (ACPI_FAILURE(status))
 860                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 861         if (ACPI_SUCCESS(status))
 862                 device->flags.power_manageable = 1;
 863
 864         /* Presence of _PRW indicates wake capable */
 865         status = acpi_get_handle(device->handle, "_PRW", &temp);
 866         if (ACPI_SUCCESS(status))
 867                 device->flags.wake_capable = 1;
 868
 869         /* TBD: Performance management */
 870
 871         return 0;
 872 }
 873
 874 static void acpi_device_get_busid(struct acpi_device *device,
 875                                   acpi_handle handle, int type)
 876 {
 877         char bus_id[5] = { '?', 0 };
 878         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 879         int i = 0;
 880
 881         /*
 882          * Bus ID
 883          * ------
 884          * The device's Bus ID is simply the object name.
 885          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 886          */
 887         switch (type) {
 888         case ACPI_BUS_TYPE_SYSTEM:
 889                 strcpy(device->pnp.bus_id, "ACPI");
 890                 break;
 891         case ACPI_BUS_TYPE_POWER_BUTTON:
 892                 strcpy(device->pnp.bus_id, "PWRF");
 893                 break;
 894         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 895                 strcpy(device->pnp.bus_id, "SLPF");
 896                 break;
 897         default:
 898                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 899                 /* Clean up trailing underscores (if any) */
 900                 for (i = 3; i > 1; i--) {
 901                         if (bus_id[i] == '_')
 902                                 bus_id[i] = '\0';
 903                         else
 904                                 break;
 905                 }
 906                 strcpy(device->pnp.bus_id, bus_id);
 907                 break;
 908         }
 909 }
 910
 911 /*
 912  * acpi_bay_match - see if a device is an ejectable driver bay
 913  *
 914  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 915  * then we can safely call it an ejectable drive bay
 916  */
 917 static int acpi_bay_match(struct acpi_device *device){
 918         acpi_status status;
 919         acpi_handle handle;
 920         acpi_handle tmp;
 921         acpi_handle phandle;
 922
 923         handle = device->handle;
 924
 925         status = acpi_get_handle(handle, "_EJ0", &tmp);
 926         if (ACPI_FAILURE(status))
 927                 return -ENODEV;
 928
 929         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 930                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 931                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 932                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 933                 return 0;
 934
 935         if (acpi_get_parent(handle, &phandle))
 936                 return -ENODEV;
 937
 938         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 939                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 940                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 941                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 942                 return 0;
 943
 944         return -ENODEV;
 945 }
 946
 947 /*
 948  * acpi_dock_match - see if a device has a _DCK method
 949  */
 950 static int acpi_dock_match(struct acpi_device *device)
 951 {
 952         acpi_handle tmp;
 953         return acpi_get_handle(device->handle, "_DCK", &tmp);
 954 }
 955
 956 static void acpi_device_set_id(struct acpi_device *device,
 957                                struct acpi_device *parent, acpi_handle handle,
 958                                int type)
 959 {
 960         struct acpi_device_info *info;
 961         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 962         char *hid = NULL;
 963         char *uid = NULL;
 964         struct acpi_compatible_id_list *cid_list = NULL;
 965         const char *cid_add = NULL;
 966         acpi_status status;
 967
 968         switch (type) {
 969         case ACPI_BUS_TYPE_DEVICE:
 970                 status = acpi_get_object_info(handle, &buffer);
 971                 if (ACPI_FAILURE(status)) {
 972                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
 973                         return;
 974                 }
 975
 976                 info = buffer.pointer;
 977                 if (info->valid & ACPI_VALID_HID)
 978                         hid = info->hardware_id.value;
 979                 if (info->valid & ACPI_VALID_UID)
 980                         uid = info->unique_id.value;
 981                 if (info->valid & ACPI_VALID_CID)
 982                         cid_list = &info->compatibility_id;
 983                 if (info->valid & ACPI_VALID_ADR) {
 984                         device->pnp.bus_address = info->address;
 985                         device->flags.bus_address = 1;
 986                 }
 987
 988                 /* If we have a video/bay/dock device, add our selfdefined
 989                    HID to the CID list. Like that the video/bay/dock drivers
 990                    will get autoloaded and the device might still match
 991                    against another driver.
 992                 */
 993                 if (acpi_is_video_device(device))
 994                         cid_add = ACPI_VIDEO_HID;
 995                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
 996                         cid_add = ACPI_BAY_HID;
 997                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
 998                         cid_add = ACPI_DOCK_HID;
 999
1000                 break;
1001         case ACPI_BUS_TYPE_POWER:
1002                 hid = ACPI_POWER_HID;
1003                 break;
1004         case ACPI_BUS_TYPE_PROCESSOR:
1005                 hid = ACPI_PROCESSOR_OBJECT_HID;
1006                 break;
1007         case ACPI_BUS_TYPE_SYSTEM:
1008                 hid = ACPI_SYSTEM_HID;
1009                 break;
1010         case ACPI_BUS_TYPE_THERMAL:
1011                 hid = ACPI_THERMAL_HID;
1012                 break;
1013         case ACPI_BUS_TYPE_POWER_BUTTON:
1014                 hid = ACPI_BUTTON_HID_POWERF;
1015                 break;
1016         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1017                 hid = ACPI_BUTTON_HID_SLEEPF;
1018                 break;
1019         }
1020
1021         /*
1022          * \_SB
1023          * ----
1024          * Fix for the system root bus device -- the only root-level device.
1025          */
1026         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1027                 hid = ACPI_BUS_HID;
1028                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1029                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1030         }
1031
1032         if (hid) {
1033                 strcpy(device->pnp.hardware_id, hid);
1034                 device->flags.hardware_id = 1;
1035         }
1036         if (uid) {
1037                 strcpy(device->pnp.unique_id, uid);
1038                 device->flags.unique_id = 1;
1039         }
1040         if (cid_list || cid_add) {
1041                 struct  acpi_compatible_id_list *list;
1042                 int size = 0;
1043                 int count = 0;
1044
1045                 if (cid_list) {
1046                         size = cid_list->size;
1047                 } else if (cid_add) {
1048                         size = sizeof(struct acpi_compatible_id_list);
1049                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1050                         if (!cid_list) {
1051                                 printk(KERN_ERR "Memory allocation error\n");
1052                                 kfree(buffer.pointer);
1053                                 return;
1054                         } else {
1055                                 cid_list->count = 0;
1056                                 cid_list->size = size;
1057                         }
1058                 }
1059                 if (cid_add)
1060                         size += sizeof(struct acpi_compatible_id);
1061                 list = kmalloc(size, GFP_KERNEL);
1062
1063                 if (list) {
1064                         if (cid_list) {
1065                                 memcpy(list, cid_list, cid_list->size);
1066                                 count = cid_list->count;
1067                         }
1068                         if (cid_add) {
1069                                 strncpy(list->id[count].value, cid_add,
1070                                         ACPI_MAX_CID_LENGTH);
1071                                 count++;
1072                                 device->flags.compatible_ids = 1;
1073                         }
1074                         list->size = size;
1075                         list->count = count;
1076                         device->pnp.cid_list = list;
1077                 } else
1078                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1079         }
1080
1081         kfree(buffer.pointer);
1082 }
1083
1084 static int acpi_device_set_context(struct acpi_device *device, int type)
1085 {
1086         acpi_status status = AE_OK;
1087         int result = 0;
1088         /*
1089          * Context
1090          * -------
1091          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1092          * resolutions from handle->device very efficient.  Note that we need
1093          * to be careful with fixed-feature devices as they all attach to the
1094          * root object.
1095          */
1096         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1097             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1098                 status = acpi_attach_data(device->handle,
1099                                           acpi_bus_data_handler, device);
1100
1101                 if (ACPI_FAILURE(status)) {
1102                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1103                         result = -ENODEV;
1104                 }
1105         }
1106         return result;
1107 }
1108
1109 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1110 {
1111         if (!dev)
1112                 return -EINVAL;
1113
1114         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1115         device_release_driver(&dev->dev);
1116
1117         if (!rmdevice)
1118                 return 0;
1119
1120         /*
1121          * unbind _ADR-Based Devices when hot removal
1122          */
1123         if (dev->flags.bus_address) {
1124                 if ((dev->parent) && (dev->parent->ops.unbind))
1125                         dev->parent->ops.unbind(dev);
1126         }
1127         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1128
1129         return 0;
1130 }
1131
1132 static int
1133 acpi_add_single_object(struct acpi_device **child,
1134                        struct acpi_device *parent, acpi_handle handle, int type,
1135                         struct acpi_bus_ops *ops)
1136 {
1137         int result = 0;
1138         struct acpi_device *device = NULL;
1139
1140
1141         if (!child)
1142                 return -EINVAL;
1143
1144         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1145         if (!device) {
1146                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1147                 return -ENOMEM;
1148         }
1149
1150         device->handle = handle;
1151         device->parent = parent;
1152         device->bus_ops = *ops; /* workround for not call .start */
1153
1154
1155         acpi_device_get_busid(device, handle, type);
1156
1157         /*
1158          * Flags
1159          * -----
1160          * Get prior to calling acpi_bus_get_status() so we know whether
1161          * or not _STA is present.  Note that we only look for object
1162          * handles -- cannot evaluate objects until we know the device is
1163          * present and properly initialized.
1164          */
1165         result = acpi_bus_get_flags(device);
1166         if (result)
1167                 goto end;
1168
1169         /*
1170          * Status
1171          * ------
1172          * See if the device is present.  We always assume that non-Device
1173          * and non-Processor objects (e.g. thermal zones, power resources,
1174          * etc.) are present, functioning, etc. (at least when parent object
1175          * is present).  Note that _STA has a different meaning for some
1176          * objects (e.g. power resources) so we need to be careful how we use
1177          * it.
1178          */
1179         switch (type) {
1180         case ACPI_BUS_TYPE_PROCESSOR:
1181         case ACPI_BUS_TYPE_DEVICE:
1182                 result = acpi_bus_get_status(device);
1183                 if (ACPI_FAILURE(result)) {
1184                         result = -ENODEV;
1185                         goto end;
1186                 }
1187                 /*
1188                  * When the device is neither present nor functional, the
1189                  * device should not be added to Linux ACPI device tree.
1190                  * When the status of the device is not present but functinal,
1191                  * it should be added to Linux ACPI tree. For example : bay
1192                  * device , dock device.
1193                  * In such conditions it is unncessary to check whether it is
1194                  * bay device or dock device.
1195                  */
1196                 if (!device->status.present && !device->status.functional) {
1197                         result = -ENODEV;
1198                         goto end;
1199                 }
1200                 break;
1201         default:
1202                 STRUCT_TO_INT(device->status) =
1203                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1204                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1205                 break;
1206         }
1207
1208         /*
1209          * Initialize Device
1210          * -----------------
1211          * TBD: Synch with Core's enumeration/initialization process.
1212          */
1213
1214         /*
1215          * Hardware ID, Unique ID, & Bus Address
1216          * -------------------------------------
1217          */
1218         acpi_device_set_id(device, parent, handle, type);
1219
1220         /*
1221          * The ACPI device is attached to acpi handle before getting
1222          * the power/wakeup/peformance flags. Otherwise OS can't get
1223          * the corresponding ACPI device by the acpi handle in the course
1224          * of getting the power/wakeup/performance flags.
1225          */
1226         result = acpi_device_set_context(device, type);
1227         if (result)
1228                 goto end;
1229
1230         /*
1231          * Power Management
1232          * ----------------
1233          */
1234         if (device->flags.power_manageable) {
1235                 result = acpi_bus_get_power_flags(device);
1236                 if (result)
1237                         goto end;
1238         }
1239
1240         /*
1241          * Wakeup device management
1242          *-----------------------
1243          */
1244         if (device->flags.wake_capable) {
1245                 result = acpi_bus_get_wakeup_device_flags(device);
1246                 if (result)
1247                         goto end;
1248         }
1249
1250         /*
1251          * Performance Management
1252          * ----------------------
1253          */
1254         if (device->flags.performance_manageable) {
1255                 result = acpi_bus_get_perf_flags(device);
1256                 if (result)
1257                         goto end;
1258         }
1259
1260
1261         result = acpi_device_register(device, parent);
1262
1263         /*
1264          * Bind _ADR-Based Devices when hot add
1265          */
1266         if (device->flags.bus_address) {
1267                 if (device->parent && device->parent->ops.bind)
1268                         device->parent->ops.bind(device);
1269         }
1270
1271       end:
1272         if (!result)
1273                 *child = device;
1274         else {
1275                 kfree(device->pnp.cid_list);
1276                 kfree(device);
1277         }
1278
1279         return result;
1280 }
1281
1282 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1283 {
1284         acpi_status status = AE_OK;
1285         struct acpi_device *parent = NULL;
1286         struct acpi_device *child = NULL;
1287         acpi_handle phandle = NULL;
1288         acpi_handle chandle = NULL;
1289         acpi_object_type type = 0;
1290         u32 level = 1;
1291
1292
1293         if (!start)
1294                 return -EINVAL;
1295
1296         parent = start;
1297         phandle = start->handle;
1298
1299         /*
1300          * Parse through the ACPI namespace, identify all 'devices', and
1301          * create a new 'struct acpi_device' for each.
1302          */
1303         while ((level > 0) && parent) {
1304
1305                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1306                                               chandle, &chandle);
1307
1308                 /*
1309                  * If this scope is exhausted then move our way back up.
1310                  */
1311                 if (ACPI_FAILURE(status)) {
1312                         level--;
1313                         chandle = phandle;
1314                         acpi_get_parent(phandle, &phandle);
1315                         if (parent->parent)
1316                                 parent = parent->parent;
1317                         continue;
1318                 }
1319
1320                 status = acpi_get_type(chandle, &type);
1321                 if (ACPI_FAILURE(status))
1322                         continue;
1323
1324                 /*
1325                  * If this is a scope object then parse it (depth-first).
1326                  */
1327                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1328                         level++;
1329                         phandle = chandle;
1330                         chandle = NULL;
1331                         continue;
1332                 }
1333
1334                 /*
1335                  * We're only interested in objects that we consider 'devices'.
1336                  */
1337                 switch (type) {
1338                 case ACPI_TYPE_DEVICE:
1339                         type = ACPI_BUS_TYPE_DEVICE;
1340                         break;
1341                 case ACPI_TYPE_PROCESSOR:
1342                         type = ACPI_BUS_TYPE_PROCESSOR;
1343                         break;
1344                 case ACPI_TYPE_THERMAL:
1345                         type = ACPI_BUS_TYPE_THERMAL;
1346                         break;
1347                 case ACPI_TYPE_POWER:
1348                         type = ACPI_BUS_TYPE_POWER;
1349                         break;
1350                 default:
1351                         continue;
1352                 }
1353
1354                 if (ops->acpi_op_add)
1355                         status = acpi_add_single_object(&child, parent,
1356                                 chandle, type, ops);
1357                 else
1358                         status = acpi_bus_get_device(chandle, &child);
1359
1360                 if (ACPI_FAILURE(status))
1361                         continue;
1362
1363                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1364                         status = acpi_start_single_object(child);
1365                         if (ACPI_FAILURE(status))
1366                                 continue;
1367                 }
1368
1369                 /*
1370                  * If the device is present, enabled, and functioning then
1371                  * parse its scope (depth-first).  Note that we need to
1372                  * represent absent devices to facilitate PnP notifications
1373                  * -- but only the subtree head (not all of its children,
1374                  * which will be enumerated when the parent is inserted).
1375                  *
1376                  * TBD: Need notifications and other detection mechanisms
1377                  *      in place before we can fully implement this.
1378                  */
1379                  /*
1380                  * When the device is not present but functional, it is also
1381                  * necessary to scan the children of this device.
1382                  */
1383                 if (child->status.present || (!child->status.present &&
1384                                         child->status.functional)) {
1385                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1386                                                       NULL, NULL);
1387                         if (ACPI_SUCCESS(status)) {
1388                                 level++;
1389                                 phandle = chandle;
1390                                 chandle = NULL;
1391                                 parent = child;
1392                         }
1393                 }
1394         }
1395
1396         return 0;
1397 }
1398
1399 int
1400 acpi_bus_add(struct acpi_device **child,
1401              struct acpi_device *parent, acpi_handle handle, int type)
1402 {
1403         int result;
1404         struct acpi_bus_ops ops;
1405
1406         memset(&ops, 0, sizeof(ops));
1407         ops.acpi_op_add = 1;
1408
1409         result = acpi_add_single_object(child, parent, handle, type, &ops);
1410         if (!result)
1411                 result = acpi_bus_scan(*child, &ops);
1412
1413         return result;
1414 }
1415
1416 EXPORT_SYMBOL(acpi_bus_add);
1417
1418 int acpi_bus_start(struct acpi_device *device)
1419 {
1420         int result;
1421         struct acpi_bus_ops ops;
1422
1423
1424         if (!device)
1425                 return -EINVAL;
1426
1427         result = acpi_start_single_object(device);
1428         if (!result) {
1429                 memset(&ops, 0, sizeof(ops));
1430                 ops.acpi_op_start = 1;
1431                 result = acpi_bus_scan(device, &ops);
1432         }
1433         return result;
1434 }
1435
1436 EXPORT_SYMBOL(acpi_bus_start);
1437
1438 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1439 {
1440         acpi_status status;
1441         struct acpi_device *parent, *child;
1442         acpi_handle phandle, chandle;
1443         acpi_object_type type;
1444         u32 level = 1;
1445         int err = 0;
1446
1447         parent = start;
1448         phandle = start->handle;
1449         child = chandle = NULL;
1450
1451         while ((level > 0) && parent && (!err)) {
1452                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1453                                               chandle, &chandle);
1454
1455                 /*
1456                  * If this scope is exhausted then move our way back up.
1457                  */
1458                 if (ACPI_FAILURE(status)) {
1459                         level--;
1460                         chandle = phandle;
1461                         acpi_get_parent(phandle, &phandle);
1462                         child = parent;
1463                         parent = parent->parent;
1464
1465                         if (level == 0)
1466                                 err = acpi_bus_remove(child, rmdevice);
1467                         else
1468                                 err = acpi_bus_remove(child, 1);
1469
1470                         continue;
1471                 }
1472
1473                 status = acpi_get_type(chandle, &type);
1474                 if (ACPI_FAILURE(status)) {
1475                         continue;
1476                 }
1477                 /*
1478                  * If there is a device corresponding to chandle then
1479                  * parse it (depth-first).
1480                  */
1481                 if (acpi_bus_get_device(chandle, &child) == 0) {
1482                         level++;
1483                         phandle = chandle;
1484                         chandle = NULL;
1485                         parent = child;
1486                 }
1487                 continue;
1488         }
1489         return err;
1490 }
1491 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1492
1493
1494 static int acpi_bus_scan_fixed(struct acpi_device *root)
1495 {
1496         int result = 0;
1497         struct acpi_device *device = NULL;
1498         struct acpi_bus_ops ops;
1499
1500         if (!root)
1501                 return -ENODEV;
1502
1503         memset(&ops, 0, sizeof(ops));
1504         ops.acpi_op_add = 1;
1505         ops.acpi_op_start = 1;
1506
1507         /*
1508          * Enumerate all fixed-feature devices.
1509          */
1510         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1511                 result = acpi_add_single_object(&device, acpi_root,
1512                                                 NULL,
1513                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1514                                                 &ops);
1515         }
1516
1517         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1518                 result = acpi_add_single_object(&device, acpi_root,
1519                                                 NULL,
1520                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1521                                                 &ops);
1522         }
1523
1524         return result;
1525 }
1526
1527
1528 static int __init acpi_scan_init(void)
1529 {
1530         int result;
1531         struct acpi_bus_ops ops;
1532
1533
1534         if (acpi_disabled)
1535                 return 0;
1536
1537         memset(&ops, 0, sizeof(ops));
1538         ops.acpi_op_add = 1;
1539         ops.acpi_op_start = 1;
1540
1541         result = bus_register(&acpi_bus_type);
1542         if (result) {
1543                 /* We don't want to quit even if we failed to add suspend/resume */
1544                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1545         }
1546
1547         /*
1548          * Create the root device in the bus's device tree
1549          */
1550         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1551                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1552         if (result)
1553                 goto Done;
1554
1555         /*
1556          * Enumerate devices in the ACPI namespace.
1557          */
1558         result = acpi_bus_scan_fixed(acpi_root);
1559
1560         if (!result)
1561                 result = acpi_bus_scan(acpi_root, &ops);
1562
1563         if (result)
1564                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1565
1566       Done:
1567         return result;
1568 }
1569
1570 subsys_initcall(acpi_scan_init);