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