SAFE public projects git trees. - safe/jmp/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 #include <acpi/acinterp.h>      /* for acpi_ex_eisa_id_to_string() */
  14
  15 #define _COMPONENT              ACPI_BUS_COMPONENT
  16 ACPI_MODULE_NAME("scan");
  17 #define STRUCT_TO_INT(s)        (*((int*)&s))
  18 extern struct acpi_device *acpi_root;
  19
  20 #define ACPI_BUS_CLASS                  "system_bus"
  21 #define ACPI_BUS_HID                    "LNXSYBUS"
  22 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  23
  24 static LIST_HEAD(acpi_device_list);
  25 static LIST_HEAD(acpi_bus_id_list);
  26 DEFINE_SPINLOCK(acpi_device_lock);
  27 LIST_HEAD(acpi_wakeup_device_list);
  28
  29 struct acpi_device_bus_id{
  30         char bus_id[15];
  31         unsigned int instance_no;
  32         struct list_head node;
  33 };
  34
  35 /*
  36  * Creates hid/cid(s) string needed for modalias and uevent
  37  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  38  * char *modalias: "acpi:IBM0001:ACPI0001"
  39 */
  40 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  41                            int size)
  42 {
  43         int len;
  44         int count;
  45
  46         if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
  47                 return -ENODEV;
  48
  49         len = snprintf(modalias, size, "acpi:");
  50         size -= len;
  51
  52         if (acpi_dev->flags.hardware_id) {
  53                 count = snprintf(&modalias[len], size, "%s:",
  54                                  acpi_dev->pnp.hardware_id);
  55                 if (count < 0 || count >= size)
  56                         return -EINVAL;
  57                 len += count;
  58                 size -= count;
  59         }
  60
  61         if (acpi_dev->flags.compatible_ids) {
  62                 struct acpi_compatible_id_list *cid_list;
  63                 int i;
  64
  65                 cid_list = acpi_dev->pnp.cid_list;
  66                 for (i = 0; i < cid_list->count; i++) {
  67                         count = snprintf(&modalias[len], size, "%s:",
  68                                          cid_list->id[i].value);
  69                         if (count < 0 || count >= size) {
  70                                 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
  71                                        acpi_dev->pnp.device_name, i);
  72                                 break;
  73                         }
  74                         len += count;
  75                         size -= count;
  76                 }
  77         }
  78
  79         modalias[len] = '\0';
  80         return len;
  81 }
  82
  83 static ssize_t
  84 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  85         struct acpi_device *acpi_dev = to_acpi_device(dev);
  86         int len;
  87
  88         /* Device has no HID and no CID or string is >1024 */
  89         len = create_modalias(acpi_dev, buf, 1024);
  90         if (len <= 0)
  91                 return 0;
  92         buf[len++] = '\n';
  93         return len;
  94 }
  95 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  96
  97 static int acpi_bus_hot_remove_device(void *context)
  98 {
  99         struct acpi_device *device;
 100         acpi_handle handle = context;
 101         struct acpi_object_list arg_list;
 102         union acpi_object arg;
 103         acpi_status status = AE_OK;
 104
 105         if (acpi_bus_get_device(handle, &device))
 106                 return 0;
 107
 108         if (!device)
 109                 return 0;
 110
 111         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 112                 "Hot-removing device %s...\n", device->dev.bus_id));
 113
 114
 115         if (acpi_bus_trim(device, 1)) {
 116                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 117                                 "Removing device failed\n"));
 118                 return -1;
 119         }
 120
 121         /* power off device */
 122         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 123         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 124                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 125                                 "Power-off device failed\n"));
 126
 127         if (device->flags.lockable) {
 128                 arg_list.count = 1;
 129                 arg_list.pointer = &arg;
 130                 arg.type = ACPI_TYPE_INTEGER;
 131                 arg.integer.value = 0;
 132                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 133         }
 134
 135         arg_list.count = 1;
 136         arg_list.pointer = &arg;
 137         arg.type = ACPI_TYPE_INTEGER;
 138         arg.integer.value = 1;
 139
 140         /*
 141          * TBD: _EJD support.
 142          */
 143         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 144         if (ACPI_FAILURE(status))
 145                 return -ENODEV;
 146
 147         return 0;
 148 }
 149
 150 static ssize_t
 151 acpi_eject_store(struct device *d, struct device_attribute *attr,
 152                 const char *buf, size_t count)
 153 {
 154         int ret = count;
 155         acpi_status status;
 156         acpi_object_type type = 0;
 157         struct acpi_device *acpi_device = to_acpi_device(d);
 158         struct task_struct *task;
 159
 160         if ((!count) || (buf[0] != '1')) {
 161                 return -EINVAL;
 162         }
 163 #ifndef FORCE_EJECT
 164         if (acpi_device->driver == NULL) {
 165                 ret = -ENODEV;
 166                 goto err;
 167         }
 168 #endif
 169         status = acpi_get_type(acpi_device->handle, &type);
 170         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 171                 ret = -ENODEV;
 172                 goto err;
 173         }
 174
 175         /* remove the device in another thread to fix the deadlock issue */
 176         task = kthread_run(acpi_bus_hot_remove_device,
 177                                 acpi_device->handle, "acpi_hot_remove_device");
 178         if (IS_ERR(task))
 179                 ret = PTR_ERR(task);
 180 err:
 181         return ret;
 182 }
 183
 184 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 185
 186 static ssize_t
 187 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 188         struct acpi_device *acpi_dev = to_acpi_device(dev);
 189
 190         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
 191 }
 192 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 193
 194 static ssize_t
 195 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 196         struct acpi_device *acpi_dev = to_acpi_device(dev);
 197         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 198         int result;
 199
 200         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 201         if(result)
 202                 goto end;
 203
 204         result = sprintf(buf, "%s\n", (char*)path.pointer);
 205         kfree(path.pointer);
 206   end:
 207         return result;
 208 }
 209 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 210
 211 static int acpi_device_setup_files(struct acpi_device *dev)
 212 {
 213         acpi_status status;
 214         acpi_handle temp;
 215         int result = 0;
 216
 217         /*
 218          * Devices gotten from FADT don't have a "path" attribute
 219          */
 220         if(dev->handle) {
 221                 result = device_create_file(&dev->dev, &dev_attr_path);
 222                 if(result)
 223                         goto end;
 224         }
 225
 226         if(dev->flags.hardware_id) {
 227                 result = device_create_file(&dev->dev, &dev_attr_hid);
 228                 if(result)
 229                         goto end;
 230         }
 231
 232         if (dev->flags.hardware_id || dev->flags.compatible_ids){
 233                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 234                 if(result)
 235                         goto end;
 236         }
 237
 238         /*
 239          * If device has _EJ0, 'eject' file is created that is used to trigger
 240          * hot-removal function from userland.
 241          */
 242         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 243         if (ACPI_SUCCESS(status))
 244                 result = device_create_file(&dev->dev, &dev_attr_eject);
 245   end:
 246         return result;
 247 }
 248
 249 static void acpi_device_remove_files(struct acpi_device *dev)
 250 {
 251         acpi_status status;
 252         acpi_handle temp;
 253
 254         /*
 255          * If device has _EJ0, 'eject' file is created that is used to trigger
 256          * hot-removal function from userland.
 257          */
 258         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 259         if (ACPI_SUCCESS(status))
 260                 device_remove_file(&dev->dev, &dev_attr_eject);
 261
 262         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 263                 device_remove_file(&dev->dev, &dev_attr_modalias);
 264
 265         if(dev->flags.hardware_id)
 266                 device_remove_file(&dev->dev, &dev_attr_hid);
 267         if(dev->handle)
 268                 device_remove_file(&dev->dev, &dev_attr_path);
 269 }
 270 /* --------------------------------------------------------------------------
 271                         ACPI Bus operations
 272    -------------------------------------------------------------------------- */
 273
 274 int acpi_match_device_ids(struct acpi_device *device,
 275                           const struct acpi_device_id *ids)
 276 {
 277         const struct acpi_device_id *id;
 278
 279         if (device->flags.hardware_id) {
 280                 for (id = ids; id->id[0]; id++) {
 281                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 282                                 return 0;
 283                 }
 284         }
 285
 286         if (device->flags.compatible_ids) {
 287                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 288                 int i;
 289
 290                 for (id = ids; id->id[0]; id++) {
 291                         /* compare multiple _CID entries against driver ids */
 292                         for (i = 0; i < cid_list->count; i++) {
 293                                 if (!strcmp((char*)id->id,
 294                                             cid_list->id[i].value))
 295                                         return 0;
 296                         }
 297                 }
 298         }
 299
 300         return -ENOENT;
 301 }
 302 EXPORT_SYMBOL(acpi_match_device_ids);
 303
 304 static void acpi_device_release(struct device *dev)
 305 {
 306         struct acpi_device *acpi_dev = to_acpi_device(dev);
 307
 308         kfree(acpi_dev->pnp.cid_list);
 309         kfree(acpi_dev);
 310 }
 311
 312 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 313 {
 314         struct acpi_device *acpi_dev = to_acpi_device(dev);
 315         struct acpi_driver *acpi_drv = acpi_dev->driver;
 316
 317         if (acpi_drv && acpi_drv->ops.suspend)
 318                 return acpi_drv->ops.suspend(acpi_dev, state);
 319         return 0;
 320 }
 321
 322 static int acpi_device_resume(struct device *dev)
 323 {
 324         struct acpi_device *acpi_dev = to_acpi_device(dev);
 325         struct acpi_driver *acpi_drv = acpi_dev->driver;
 326
 327         if (acpi_drv && acpi_drv->ops.resume)
 328                 return acpi_drv->ops.resume(acpi_dev);
 329         return 0;
 330 }
 331
 332 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 333 {
 334         struct acpi_device *acpi_dev = to_acpi_device(dev);
 335         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 336
 337         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 338 }
 339
 340 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 341 {
 342         struct acpi_device *acpi_dev = to_acpi_device(dev);
 343         int len;
 344
 345         if (add_uevent_var(env, "MODALIAS="))
 346                 return -ENOMEM;
 347         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 348                               sizeof(env->buf) - env->buflen);
 349         if (len >= (sizeof(env->buf) - env->buflen))
 350                 return -ENOMEM;
 351         env->buflen += len;
 352         return 0;
 353 }
 354
 355 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 356 static int acpi_start_single_object(struct acpi_device *);
 357 static int acpi_device_probe(struct device * dev)
 358 {
 359         struct acpi_device *acpi_dev = to_acpi_device(dev);
 360         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 361         int ret;
 362
 363         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 364         if (!ret) {
 365                 if (acpi_dev->bus_ops.acpi_op_start)
 366                         acpi_start_single_object(acpi_dev);
 367                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 368                         "Found driver [%s] for device [%s]\n",
 369                         acpi_drv->name, acpi_dev->pnp.bus_id));
 370                 get_device(dev);
 371         }
 372         return ret;
 373 }
 374
 375 static int acpi_device_remove(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) {
 381                 if (acpi_drv->ops.stop)
 382                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 383                 if (acpi_drv->ops.remove)
 384                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 385         }
 386         acpi_dev->driver = NULL;
 387         acpi_driver_data(dev) = NULL;
 388
 389         put_device(dev);
 390         return 0;
 391 }
 392
 393 static void acpi_device_shutdown(struct device *dev)
 394 {
 395         struct acpi_device *acpi_dev = to_acpi_device(dev);
 396         struct acpi_driver *acpi_drv = acpi_dev->driver;
 397
 398         if (acpi_drv && acpi_drv->ops.shutdown)
 399                 acpi_drv->ops.shutdown(acpi_dev);
 400
 401         return ;
 402 }
 403
 404 struct bus_type acpi_bus_type = {
 405         .name           = "acpi",
 406         .suspend        = acpi_device_suspend,
 407         .resume         = acpi_device_resume,
 408         .shutdown       = acpi_device_shutdown,
 409         .match          = acpi_bus_match,
 410         .probe          = acpi_device_probe,
 411         .remove         = acpi_device_remove,
 412         .uevent         = acpi_device_uevent,
 413 };
 414
 415 static int acpi_device_register(struct acpi_device *device,
 416                                  struct acpi_device *parent)
 417 {
 418         int result;
 419         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 420         int found = 0;
 421         /*
 422          * Linkage
 423          * -------
 424          * Link this device to its parent and siblings.
 425          */
 426         INIT_LIST_HEAD(&device->children);
 427         INIT_LIST_HEAD(&device->node);
 428         INIT_LIST_HEAD(&device->g_list);
 429         INIT_LIST_HEAD(&device->wakeup_list);
 430
 431         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 432         if (!new_bus_id) {
 433                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 434                 return -ENOMEM;
 435         }
 436
 437         spin_lock(&acpi_device_lock);
 438         /*
 439          * Find suitable bus_id and instance number in acpi_bus_id_list
 440          * If failed, create one and link it into acpi_bus_id_list
 441          */
 442         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 443                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 444                         acpi_device_bus_id->instance_no ++;
 445                         found = 1;
 446                         kfree(new_bus_id);
 447                         break;
 448                 }
 449         }
 450         if(!found) {
 451                 acpi_device_bus_id = new_bus_id;
 452                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 453                 acpi_device_bus_id->instance_no = 0;
 454                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 455         }
 456         sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 457
 458         if (device->parent) {
 459                 list_add_tail(&device->node, &device->parent->children);
 460                 list_add_tail(&device->g_list, &device->parent->g_list);
 461         } else
 462                 list_add_tail(&device->g_list, &acpi_device_list);
 463         if (device->wakeup.flags.valid)
 464                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 465         spin_unlock(&acpi_device_lock);
 466
 467         if (device->parent)
 468                 device->dev.parent = &parent->dev;
 469         device->dev.bus = &acpi_bus_type;
 470         device_initialize(&device->dev);
 471         device->dev.release = &acpi_device_release;
 472         result = device_add(&device->dev);
 473         if(result) {
 474                 dev_err(&device->dev, "Error adding device\n");
 475                 goto end;
 476         }
 477
 478         result = acpi_device_setup_files(device);
 479         if(result)
 480                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
 481
 482         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 483         return 0;
 484   end:
 485         spin_lock(&acpi_device_lock);
 486         if (device->parent) {
 487                 list_del(&device->node);
 488                 list_del(&device->g_list);
 489         } else
 490                 list_del(&device->g_list);
 491         list_del(&device->wakeup_list);
 492         spin_unlock(&acpi_device_lock);
 493         return result;
 494 }
 495
 496 static void acpi_device_unregister(struct acpi_device *device, int type)
 497 {
 498         spin_lock(&acpi_device_lock);
 499         if (device->parent) {
 500                 list_del(&device->node);
 501                 list_del(&device->g_list);
 502         } else
 503                 list_del(&device->g_list);
 504
 505         list_del(&device->wakeup_list);
 506         spin_unlock(&acpi_device_lock);
 507
 508         acpi_detach_data(device->handle, acpi_bus_data_handler);
 509
 510         acpi_device_remove_files(device);
 511         device_unregister(&device->dev);
 512 }
 513
 514 /* --------------------------------------------------------------------------
 515                                  Driver Management
 516    -------------------------------------------------------------------------- */
 517 /**
 518  * acpi_bus_driver_init - add a device to a driver
 519  * @device: the device to add and initialize
 520  * @driver: driver for the device
 521  *
 522  * Used to initialize a device via its device driver.  Called whenever a
 523  * driver is bound to a device.  Invokes the driver's add() ops.
 524  */
 525 static int
 526 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 527 {
 528         int result = 0;
 529
 530
 531         if (!device || !driver)
 532                 return -EINVAL;
 533
 534         if (!driver->ops.add)
 535                 return -ENOSYS;
 536
 537         result = driver->ops.add(device);
 538         if (result) {
 539                 device->driver = NULL;
 540                 acpi_driver_data(device) = NULL;
 541                 return result;
 542         }
 543
 544         device->driver = driver;
 545
 546         /*
 547          * TBD - Configuration Management: Assign resources to device based
 548          * upon possible configuration and currently allocated resources.
 549          */
 550
 551         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 552                           "Driver successfully bound to device\n"));
 553         return 0;
 554 }
 555
 556 static int acpi_start_single_object(struct acpi_device *device)
 557 {
 558         int result = 0;
 559         struct acpi_driver *driver;
 560
 561
 562         if (!(driver = device->driver))
 563                 return 0;
 564
 565         if (driver->ops.start) {
 566                 result = driver->ops.start(device);
 567                 if (result && driver->ops.remove)
 568                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 569         }
 570
 571         return result;
 572 }
 573
 574 /**
 575  * acpi_bus_register_driver - register a driver with the ACPI bus
 576  * @driver: driver being registered
 577  *
 578  * Registers a driver with the ACPI bus.  Searches the namespace for all
 579  * devices that match the driver's criteria and binds.  Returns zero for
 580  * success or a negative error status for failure.
 581  */
 582 int acpi_bus_register_driver(struct acpi_driver *driver)
 583 {
 584         int ret;
 585
 586         if (acpi_disabled)
 587                 return -ENODEV;
 588         driver->drv.name = driver->name;
 589         driver->drv.bus = &acpi_bus_type;
 590         driver->drv.owner = driver->owner;
 591
 592         ret = driver_register(&driver->drv);
 593         return ret;
 594 }
 595
 596 EXPORT_SYMBOL(acpi_bus_register_driver);
 597
 598 /**
 599  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 600  * @driver: driver to unregister
 601  *
 602  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 603  * devices that match the driver's criteria and unbinds.
 604  */
 605 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 606 {
 607         driver_unregister(&driver->drv);
 608 }
 609
 610 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 611
 612 /* --------------------------------------------------------------------------
 613                                  Device Enumeration
 614    -------------------------------------------------------------------------- */
 615 acpi_status
 616 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 617 {
 618         acpi_status status;
 619         acpi_handle tmp;
 620         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 621         union acpi_object *obj;
 622
 623         status = acpi_get_handle(handle, "_EJD", &tmp);
 624         if (ACPI_FAILURE(status))
 625                 return status;
 626
 627         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 628         if (ACPI_SUCCESS(status)) {
 629                 obj = buffer.pointer;
 630                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 631                                          ejd);
 632                 kfree(buffer.pointer);
 633         }
 634         return status;
 635 }
 636 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 637
 638 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 639 {
 640
 641         /* TBD */
 642
 643         return;
 644 }
 645
 646 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 647 {
 648         device->performance.state = ACPI_STATE_UNKNOWN;
 649         return 0;
 650 }
 651
 652 static acpi_status
 653 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 654                                              union acpi_object *package)
 655 {
 656         int i = 0;
 657         union acpi_object *element = NULL;
 658
 659         if (!device || !package || (package->package.count < 2))
 660                 return AE_BAD_PARAMETER;
 661
 662         element = &(package->package.elements[0]);
 663         if (!element)
 664                 return AE_BAD_PARAMETER;
 665         if (element->type == ACPI_TYPE_PACKAGE) {
 666                 if ((element->package.count < 2) ||
 667                     (element->package.elements[0].type !=
 668                      ACPI_TYPE_LOCAL_REFERENCE)
 669                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 670                         return AE_BAD_DATA;
 671                 device->wakeup.gpe_device =
 672                     element->package.elements[0].reference.handle;
 673                 device->wakeup.gpe_number =
 674                     (u32) element->package.elements[1].integer.value;
 675         } else if (element->type == ACPI_TYPE_INTEGER) {
 676                 device->wakeup.gpe_number = element->integer.value;
 677         } else
 678                 return AE_BAD_DATA;
 679
 680         element = &(package->package.elements[1]);
 681         if (element->type != ACPI_TYPE_INTEGER) {
 682                 return AE_BAD_DATA;
 683         }
 684         device->wakeup.sleep_state = element->integer.value;
 685
 686         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 687                 return AE_NO_MEMORY;
 688         }
 689         device->wakeup.resources.count = package->package.count - 2;
 690         for (i = 0; i < device->wakeup.resources.count; i++) {
 691                 element = &(package->package.elements[i + 2]);
 692                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 693                         return AE_BAD_DATA;
 694
 695                 device->wakeup.resources.handles[i] = element->reference.handle;
 696         }
 697
 698         return AE_OK;
 699 }
 700
 701 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 702 {
 703         acpi_status status = 0;
 704         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 705         union acpi_object *package = NULL;
 706         int psw_error;
 707
 708         struct acpi_device_id button_device_ids[] = {
 709                 {"PNP0C0D", 0},
 710                 {"PNP0C0C", 0},
 711                 {"PNP0C0E", 0},
 712                 {"", 0},
 713         };
 714
 715         /* _PRW */
 716         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 717         if (ACPI_FAILURE(status)) {
 718                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 719                 goto end;
 720         }
 721
 722         package = (union acpi_object *)buffer.pointer;
 723         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 724         if (ACPI_FAILURE(status)) {
 725                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 726                 goto end;
 727         }
 728
 729         kfree(buffer.pointer);
 730
 731         device->wakeup.flags.valid = 1;
 732         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 733          * system for the ACPI device with the _PRW object.
 734          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 735          * So it is necessary to call _DSW object first. Only when it is not
 736          * present will the _PSW object used.
 737          */
 738         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 739         if (psw_error)
 740                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 741                                 "error in _DSW or _PSW evaluation\n"));
 742
 743         /* Power button, Lid switch always enable wakeup */
 744         if (!acpi_match_device_ids(device, button_device_ids))
 745                 device->wakeup.flags.run_wake = 1;
 746
 747       end:
 748         if (ACPI_FAILURE(status))
 749                 device->flags.wake_capable = 0;
 750         return 0;
 751 }
 752
 753 static int acpi_bus_get_power_flags(struct acpi_device *device)
 754 {
 755         acpi_status status = 0;
 756         acpi_handle handle = NULL;
 757         u32 i = 0;
 758
 759
 760         /*
 761          * Power Management Flags
 762          */
 763         status = acpi_get_handle(device->handle, "_PSC", &handle);
 764         if (ACPI_SUCCESS(status))
 765                 device->power.flags.explicit_get = 1;
 766         status = acpi_get_handle(device->handle, "_IRC", &handle);
 767         if (ACPI_SUCCESS(status))
 768                 device->power.flags.inrush_current = 1;
 769
 770         /*
 771          * Enumerate supported power management states
 772          */
 773         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 774                 struct acpi_device_power_state *ps = &device->power.states[i];
 775                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 776
 777                 /* Evaluate "_PRx" to se if power resources are referenced */
 778                 acpi_evaluate_reference(device->handle, object_name, NULL,
 779                                         &ps->resources);
 780                 if (ps->resources.count) {
 781                         device->power.flags.power_resources = 1;
 782                         ps->flags.valid = 1;
 783                 }
 784
 785                 /* Evaluate "_PSx" to see if we can do explicit sets */
 786                 object_name[2] = 'S';
 787                 status = acpi_get_handle(device->handle, object_name, &handle);
 788                 if (ACPI_SUCCESS(status)) {
 789                         ps->flags.explicit_set = 1;
 790                         ps->flags.valid = 1;
 791                 }
 792
 793                 /* State is valid if we have some power control */
 794                 if (ps->resources.count || ps->flags.explicit_set)
 795                         ps->flags.valid = 1;
 796
 797                 ps->power = -1; /* Unknown - driver assigned */
 798                 ps->latency = -1;       /* Unknown - driver assigned */
 799         }
 800
 801         /* Set defaults for D0 and D3 states (always valid) */
 802         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 803         device->power.states[ACPI_STATE_D0].power = 100;
 804         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 805         device->power.states[ACPI_STATE_D3].power = 0;
 806
 807         /* TBD: System wake support and resource requirements. */
 808
 809         device->power.state = ACPI_STATE_UNKNOWN;
 810         acpi_bus_get_power(device->handle, &(device->power.state));
 811
 812         return 0;
 813 }
 814
 815 static int acpi_bus_get_flags(struct acpi_device *device)
 816 {
 817         acpi_status status = AE_OK;
 818         acpi_handle temp = NULL;
 819
 820
 821         /* Presence of _STA indicates 'dynamic_status' */
 822         status = acpi_get_handle(device->handle, "_STA", &temp);
 823         if (ACPI_SUCCESS(status))
 824                 device->flags.dynamic_status = 1;
 825
 826         /* Presence of _CID indicates 'compatible_ids' */
 827         status = acpi_get_handle(device->handle, "_CID", &temp);
 828         if (ACPI_SUCCESS(status))
 829                 device->flags.compatible_ids = 1;
 830
 831         /* Presence of _RMV indicates 'removable' */
 832         status = acpi_get_handle(device->handle, "_RMV", &temp);
 833         if (ACPI_SUCCESS(status))
 834                 device->flags.removable = 1;
 835
 836         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 837         status = acpi_get_handle(device->handle, "_EJD", &temp);
 838         if (ACPI_SUCCESS(status))
 839                 device->flags.ejectable = 1;
 840         else {
 841                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 842                 if (ACPI_SUCCESS(status))
 843                         device->flags.ejectable = 1;
 844         }
 845
 846         /* Presence of _LCK indicates 'lockable' */
 847         status = acpi_get_handle(device->handle, "_LCK", &temp);
 848         if (ACPI_SUCCESS(status))
 849                 device->flags.lockable = 1;
 850
 851         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 852         status = acpi_get_handle(device->handle, "_PS0", &temp);
 853         if (ACPI_FAILURE(status))
 854                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 855         if (ACPI_SUCCESS(status))
 856                 device->flags.power_manageable = 1;
 857
 858         /* Presence of _PRW indicates wake capable */
 859         status = acpi_get_handle(device->handle, "_PRW", &temp);
 860         if (ACPI_SUCCESS(status))
 861                 device->flags.wake_capable = 1;
 862
 863         /* TBD: Performance management */
 864
 865         return 0;
 866 }
 867
 868 static void acpi_device_get_busid(struct acpi_device *device,
 869                                   acpi_handle handle, int type)
 870 {
 871         char bus_id[5] = { '?', 0 };
 872         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 873         int i = 0;
 874
 875         /*
 876          * Bus ID
 877          * ------
 878          * The device's Bus ID is simply the object name.
 879          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 880          */
 881         switch (type) {
 882         case ACPI_BUS_TYPE_SYSTEM:
 883                 strcpy(device->pnp.bus_id, "ACPI");
 884                 break;
 885         case ACPI_BUS_TYPE_POWER_BUTTON:
 886                 strcpy(device->pnp.bus_id, "PWRF");
 887                 break;
 888         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 889                 strcpy(device->pnp.bus_id, "SLPF");
 890                 break;
 891         default:
 892                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 893                 /* Clean up trailing underscores (if any) */
 894                 for (i = 3; i > 1; i--) {
 895                         if (bus_id[i] == '_')
 896                                 bus_id[i] = '\0';
 897                         else
 898                                 break;
 899                 }
 900                 strcpy(device->pnp.bus_id, bus_id);
 901                 break;
 902         }
 903 }
 904
 905 static int
 906 acpi_video_bus_match(struct acpi_device *device)
 907 {
 908         acpi_handle h_dummy;
 909
 910         if (!device)
 911                 return -EINVAL;
 912
 913         /* Since there is no HID, CID for ACPI Video drivers, we have
 914          * to check well known required nodes for each feature we support.
 915          */
 916
 917         /* Does this device able to support video switching ? */
 918         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) &&
 919             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
 920                 return 0;
 921
 922         /* Does this device able to retrieve a video ROM ? */
 923         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
 924                 return 0;
 925
 926         /* Does this device able to configure which video head to be POSTed ? */
 927         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) &&
 928             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) &&
 929             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy)))
 930                 return 0;
 931
 932         return -ENODEV;
 933 }
 934
 935 /*
 936  * acpi_bay_match - see if a device is an ejectable driver bay
 937  *
 938  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 939  * then we can safely call it an ejectable drive bay
 940  */
 941 static int acpi_bay_match(struct acpi_device *device){
 942         acpi_status status;
 943         acpi_handle handle;
 944         acpi_handle tmp;
 945         acpi_handle phandle;
 946
 947         handle = device->handle;
 948
 949         status = acpi_get_handle(handle, "_EJ0", &tmp);
 950         if (ACPI_FAILURE(status))
 951                 return -ENODEV;
 952
 953         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 954                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 955                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 956                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 957                 return 0;
 958
 959         if (acpi_get_parent(handle, &phandle))
 960                 return -ENODEV;
 961
 962         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 963                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 964                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 965                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 966                 return 0;
 967
 968         return -ENODEV;
 969 }
 970
 971 /*
 972  * acpi_dock_match - see if a device has a _DCK method
 973  */
 974 static int acpi_dock_match(struct acpi_device *device)
 975 {
 976         acpi_handle tmp;
 977         return acpi_get_handle(device->handle, "_DCK", &tmp);
 978 }
 979
 980 static void acpi_device_set_id(struct acpi_device *device,
 981                                struct acpi_device *parent, acpi_handle handle,
 982                                int type)
 983 {
 984         struct acpi_device_info *info;
 985         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 986         char *hid = NULL;
 987         char *uid = NULL;
 988         struct acpi_compatible_id_list *cid_list = NULL;
 989         const char *cid_add = NULL;
 990         acpi_status status;
 991
 992         switch (type) {
 993         case ACPI_BUS_TYPE_DEVICE:
 994                 status = acpi_get_object_info(handle, &buffer);
 995                 if (ACPI_FAILURE(status)) {
 996                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
 997                         return;
 998                 }
 999
1000                 info = buffer.pointer;
1001                 if (info->valid & ACPI_VALID_HID)
1002                         hid = info->hardware_id.value;
1003                 if (info->valid & ACPI_VALID_UID)
1004                         uid = info->unique_id.value;
1005                 if (info->valid & ACPI_VALID_CID)
1006                         cid_list = &info->compatibility_id;
1007                 if (info->valid & ACPI_VALID_ADR) {
1008                         device->pnp.bus_address = info->address;
1009                         device->flags.bus_address = 1;
1010                 }
1011
1012                 /* If we have a video/bay/dock device, add our selfdefined
1013                    HID to the CID list. Like that the video/bay/dock drivers
1014                    will get autoloaded and the device might still match
1015                    against another driver.
1016                 */
1017                 if (ACPI_SUCCESS(acpi_video_bus_match(device)))
1018                         cid_add = ACPI_VIDEO_HID;
1019                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1020                         cid_add = ACPI_BAY_HID;
1021                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1022                         cid_add = ACPI_DOCK_HID;
1023
1024                 break;
1025         case ACPI_BUS_TYPE_POWER:
1026                 hid = ACPI_POWER_HID;
1027                 break;
1028         case ACPI_BUS_TYPE_PROCESSOR:
1029                 hid = ACPI_PROCESSOR_HID;
1030                 break;
1031         case ACPI_BUS_TYPE_SYSTEM:
1032                 hid = ACPI_SYSTEM_HID;
1033                 break;
1034         case ACPI_BUS_TYPE_THERMAL:
1035                 hid = ACPI_THERMAL_HID;
1036                 break;
1037         case ACPI_BUS_TYPE_POWER_BUTTON:
1038                 hid = ACPI_BUTTON_HID_POWERF;
1039                 break;
1040         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1041                 hid = ACPI_BUTTON_HID_SLEEPF;
1042                 break;
1043         }
1044
1045         /*
1046          * \_SB
1047          * ----
1048          * Fix for the system root bus device -- the only root-level device.
1049          */
1050         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1051                 hid = ACPI_BUS_HID;
1052                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1053                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1054         }
1055
1056         if (hid) {
1057                 strcpy(device->pnp.hardware_id, hid);
1058                 device->flags.hardware_id = 1;
1059         }
1060         if (uid) {
1061                 strcpy(device->pnp.unique_id, uid);
1062                 device->flags.unique_id = 1;
1063         }
1064         if (cid_list || cid_add) {
1065                 struct  acpi_compatible_id_list *list;
1066                 int size = 0;
1067                 int count = 0;
1068
1069                 if (cid_list) {
1070                         size = cid_list->size;
1071                 } else if (cid_add) {
1072                         size = sizeof(struct acpi_compatible_id_list);
1073                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1074                         if (!cid_list) {
1075                                 printk(KERN_ERR "Memory allocation error\n");
1076                                 kfree(buffer.pointer);
1077                                 return;
1078                         } else {
1079                                 cid_list->count = 0;
1080                                 cid_list->size = size;
1081                         }
1082                 }
1083                 if (cid_add)
1084                         size += sizeof(struct acpi_compatible_id);
1085                 list = kmalloc(size, GFP_KERNEL);
1086
1087                 if (list) {
1088                         if (cid_list) {
1089                                 memcpy(list, cid_list, cid_list->size);
1090                                 count = cid_list->count;
1091                         }
1092                         if (cid_add) {
1093                                 strncpy(list->id[count].value, cid_add,
1094                                         ACPI_MAX_CID_LENGTH);
1095                                 count++;
1096                                 device->flags.compatible_ids = 1;
1097                         }
1098                         list->size = size;
1099                         list->count = count;
1100                         device->pnp.cid_list = list;
1101                 } else
1102                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1103         }
1104
1105         kfree(buffer.pointer);
1106 }
1107
1108 static int acpi_device_set_context(struct acpi_device *device, int type)
1109 {
1110         acpi_status status = AE_OK;
1111         int result = 0;
1112         /*
1113          * Context
1114          * -------
1115          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1116          * resolutions from handle->device very efficient.  Note that we need
1117          * to be careful with fixed-feature devices as they all attach to the
1118          * root object.
1119          */
1120         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1121             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1122                 status = acpi_attach_data(device->handle,
1123                                           acpi_bus_data_handler, device);
1124
1125                 if (ACPI_FAILURE(status)) {
1126                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1127                         result = -ENODEV;
1128                 }
1129         }
1130         return result;
1131 }
1132
1133 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1134 {
1135         if (!dev)
1136                 return -EINVAL;
1137
1138         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1139         device_release_driver(&dev->dev);
1140
1141         if (!rmdevice)
1142                 return 0;
1143
1144         /*
1145          * unbind _ADR-Based Devices when hot removal
1146          */
1147         if (dev->flags.bus_address) {
1148                 if ((dev->parent) && (dev->parent->ops.unbind))
1149                         dev->parent->ops.unbind(dev);
1150         }
1151         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1152
1153         return 0;
1154 }
1155
1156 static int
1157 acpi_is_child_device(struct acpi_device *device,
1158                         int (*matcher)(struct acpi_device *))
1159 {
1160         int result = -ENODEV;
1161
1162         do {
1163                 if (ACPI_SUCCESS(matcher(device)))
1164                         return AE_OK;
1165         } while ((device = device->parent));
1166
1167         return result;
1168 }
1169
1170 static int
1171 acpi_add_single_object(struct acpi_device **child,
1172                        struct acpi_device *parent, acpi_handle handle, int type,
1173                         struct acpi_bus_ops *ops)
1174 {
1175         int result = 0;
1176         struct acpi_device *device = NULL;
1177
1178
1179         if (!child)
1180                 return -EINVAL;
1181
1182         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1183         if (!device) {
1184                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1185                 return -ENOMEM;
1186         }
1187
1188         device->handle = handle;
1189         device->parent = parent;
1190         device->bus_ops = *ops; /* workround for not call .start */
1191
1192
1193         acpi_device_get_busid(device, handle, type);
1194
1195         /*
1196          * Flags
1197          * -----
1198          * Get prior to calling acpi_bus_get_status() so we know whether
1199          * or not _STA is present.  Note that we only look for object
1200          * handles -- cannot evaluate objects until we know the device is
1201          * present and properly initialized.
1202          */
1203         result = acpi_bus_get_flags(device);
1204         if (result)
1205                 goto end;
1206
1207         /*
1208          * Status
1209          * ------
1210          * See if the device is present.  We always assume that non-Device
1211          * and non-Processor objects (e.g. thermal zones, power resources,
1212          * etc.) are present, functioning, etc. (at least when parent object
1213          * is present).  Note that _STA has a different meaning for some
1214          * objects (e.g. power resources) so we need to be careful how we use
1215          * it.
1216          */
1217         switch (type) {
1218         case ACPI_BUS_TYPE_PROCESSOR:
1219         case ACPI_BUS_TYPE_DEVICE:
1220                 result = acpi_bus_get_status(device);
1221                 if (ACPI_FAILURE(result)) {
1222                         result = -ENODEV;
1223                         goto end;
1224                 }
1225                 if (!device->status.present) {
1226                         /* Bay and dock should be handled even if absent */
1227                         if (!ACPI_SUCCESS(
1228                              acpi_is_child_device(device, acpi_bay_match)) &&
1229                             !ACPI_SUCCESS(
1230                              acpi_is_child_device(device, acpi_dock_match))) {
1231                                         result = -ENODEV;
1232                                         goto end;
1233                         }
1234                 }
1235                 break;
1236         default:
1237                 STRUCT_TO_INT(device->status) =
1238                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1239                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1240                 break;
1241         }
1242
1243         /*
1244          * Initialize Device
1245          * -----------------
1246          * TBD: Synch with Core's enumeration/initialization process.
1247          */
1248
1249         /*
1250          * Hardware ID, Unique ID, & Bus Address
1251          * -------------------------------------
1252          */
1253         acpi_device_set_id(device, parent, handle, type);
1254
1255         /*
1256          * The ACPI device is attached to acpi handle before getting
1257          * the power/wakeup/peformance flags. Otherwise OS can't get
1258          * the corresponding ACPI device by the acpi handle in the course
1259          * of getting the power/wakeup/performance flags.
1260          */
1261         result = acpi_device_set_context(device, type);
1262         if (result)
1263                 goto end;
1264
1265         /*
1266          * Power Management
1267          * ----------------
1268          */
1269         if (device->flags.power_manageable) {
1270                 result = acpi_bus_get_power_flags(device);
1271                 if (result)
1272                         goto end;
1273         }
1274
1275         /*
1276          * Wakeup device management
1277          *-----------------------
1278          */
1279         if (device->flags.wake_capable) {
1280                 result = acpi_bus_get_wakeup_device_flags(device);
1281                 if (result)
1282                         goto end;
1283         }
1284
1285         /*
1286          * Performance Management
1287          * ----------------------
1288          */
1289         if (device->flags.performance_manageable) {
1290                 result = acpi_bus_get_perf_flags(device);
1291                 if (result)
1292                         goto end;
1293         }
1294
1295
1296         result = acpi_device_register(device, parent);
1297
1298         /*
1299          * Bind _ADR-Based Devices when hot add
1300          */
1301         if (device->flags.bus_address) {
1302                 if (device->parent && device->parent->ops.bind)
1303                         device->parent->ops.bind(device);
1304         }
1305
1306       end:
1307         if (!result)
1308                 *child = device;
1309         else {
1310                 kfree(device->pnp.cid_list);
1311                 kfree(device);
1312         }
1313
1314         return result;
1315 }
1316
1317 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1318 {
1319         acpi_status status = AE_OK;
1320         struct acpi_device *parent = NULL;
1321         struct acpi_device *child = NULL;
1322         acpi_handle phandle = NULL;
1323         acpi_handle chandle = NULL;
1324         acpi_object_type type = 0;
1325         u32 level = 1;
1326
1327
1328         if (!start)
1329                 return -EINVAL;
1330
1331         parent = start;
1332         phandle = start->handle;
1333
1334         /*
1335          * Parse through the ACPI namespace, identify all 'devices', and
1336          * create a new 'struct acpi_device' for each.
1337          */
1338         while ((level > 0) && parent) {
1339
1340                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1341                                               chandle, &chandle);
1342
1343                 /*
1344                  * If this scope is exhausted then move our way back up.
1345                  */
1346                 if (ACPI_FAILURE(status)) {
1347                         level--;
1348                         chandle = phandle;
1349                         acpi_get_parent(phandle, &phandle);
1350                         if (parent->parent)
1351                                 parent = parent->parent;
1352                         continue;
1353                 }
1354
1355                 status = acpi_get_type(chandle, &type);
1356                 if (ACPI_FAILURE(status))
1357                         continue;
1358
1359                 /*
1360                  * If this is a scope object then parse it (depth-first).
1361                  */
1362                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1363                         level++;
1364                         phandle = chandle;
1365                         chandle = NULL;
1366                         continue;
1367                 }
1368
1369                 /*
1370                  * We're only interested in objects that we consider 'devices'.
1371                  */
1372                 switch (type) {
1373                 case ACPI_TYPE_DEVICE:
1374                         type = ACPI_BUS_TYPE_DEVICE;
1375                         break;
1376                 case ACPI_TYPE_PROCESSOR:
1377                         type = ACPI_BUS_TYPE_PROCESSOR;
1378                         break;
1379                 case ACPI_TYPE_THERMAL:
1380                         type = ACPI_BUS_TYPE_THERMAL;
1381                         break;
1382                 case ACPI_TYPE_POWER:
1383                         type = ACPI_BUS_TYPE_POWER;
1384                         break;
1385                 default:
1386                         continue;
1387                 }
1388
1389                 if (ops->acpi_op_add)
1390                         status = acpi_add_single_object(&child, parent,
1391                                 chandle, type, ops);
1392                 else
1393                         status = acpi_bus_get_device(chandle, &child);
1394
1395                 if (ACPI_FAILURE(status))
1396                         continue;
1397
1398                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1399                         status = acpi_start_single_object(child);
1400                         if (ACPI_FAILURE(status))
1401                                 continue;
1402                 }
1403
1404                 /*
1405                  * If the device is present, enabled, and functioning then
1406                  * parse its scope (depth-first).  Note that we need to
1407                  * represent absent devices to facilitate PnP notifications
1408                  * -- but only the subtree head (not all of its children,
1409                  * which will be enumerated when the parent is inserted).
1410                  *
1411                  * TBD: Need notifications and other detection mechanisms
1412                  *      in place before we can fully implement this.
1413                  */
1414                 if (child->status.present) {
1415                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1416                                                       NULL, NULL);
1417                         if (ACPI_SUCCESS(status)) {
1418                                 level++;
1419                                 phandle = chandle;
1420                                 chandle = NULL;
1421                                 parent = child;
1422                         }
1423                 }
1424         }
1425
1426         return 0;
1427 }
1428
1429 int
1430 acpi_bus_add(struct acpi_device **child,
1431              struct acpi_device *parent, acpi_handle handle, int type)
1432 {
1433         int result;
1434         struct acpi_bus_ops ops;
1435
1436         memset(&ops, 0, sizeof(ops));
1437         ops.acpi_op_add = 1;
1438
1439         result = acpi_add_single_object(child, parent, handle, type, &ops);
1440         if (!result)
1441                 result = acpi_bus_scan(*child, &ops);
1442
1443         return result;
1444 }
1445
1446 EXPORT_SYMBOL(acpi_bus_add);
1447
1448 int acpi_bus_start(struct acpi_device *device)
1449 {
1450         int result;
1451         struct acpi_bus_ops ops;
1452
1453
1454         if (!device)
1455                 return -EINVAL;
1456
1457         result = acpi_start_single_object(device);
1458         if (!result) {
1459                 memset(&ops, 0, sizeof(ops));
1460                 ops.acpi_op_start = 1;
1461                 result = acpi_bus_scan(device, &ops);
1462         }
1463         return result;
1464 }
1465
1466 EXPORT_SYMBOL(acpi_bus_start);
1467
1468 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1469 {
1470         acpi_status status;
1471         struct acpi_device *parent, *child;
1472         acpi_handle phandle, chandle;
1473         acpi_object_type type;
1474         u32 level = 1;
1475         int err = 0;
1476
1477         parent = start;
1478         phandle = start->handle;
1479         child = chandle = NULL;
1480
1481         while ((level > 0) && parent && (!err)) {
1482                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1483                                               chandle, &chandle);
1484
1485                 /*
1486                  * If this scope is exhausted then move our way back up.
1487                  */
1488                 if (ACPI_FAILURE(status)) {
1489                         level--;
1490                         chandle = phandle;
1491                         acpi_get_parent(phandle, &phandle);
1492                         child = parent;
1493                         parent = parent->parent;
1494
1495                         if (level == 0)
1496                                 err = acpi_bus_remove(child, rmdevice);
1497                         else
1498                                 err = acpi_bus_remove(child, 1);
1499
1500                         continue;
1501                 }
1502
1503                 status = acpi_get_type(chandle, &type);
1504                 if (ACPI_FAILURE(status)) {
1505                         continue;
1506                 }
1507                 /*
1508                  * If there is a device corresponding to chandle then
1509                  * parse it (depth-first).
1510                  */
1511                 if (acpi_bus_get_device(chandle, &child) == 0) {
1512                         level++;
1513                         phandle = chandle;
1514                         chandle = NULL;
1515                         parent = child;
1516                 }
1517                 continue;
1518         }
1519         return err;
1520 }
1521 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1522
1523
1524 static int acpi_bus_scan_fixed(struct acpi_device *root)
1525 {
1526         int result = 0;
1527         struct acpi_device *device = NULL;
1528         struct acpi_bus_ops ops;
1529
1530         if (!root)
1531                 return -ENODEV;
1532
1533         memset(&ops, 0, sizeof(ops));
1534         ops.acpi_op_add = 1;
1535         ops.acpi_op_start = 1;
1536
1537         /*
1538          * Enumerate all fixed-feature devices.
1539          */
1540         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1541                 result = acpi_add_single_object(&device, acpi_root,
1542                                                 NULL,
1543                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1544                                                 &ops);
1545         }
1546
1547         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1548                 result = acpi_add_single_object(&device, acpi_root,
1549                                                 NULL,
1550                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1551                                                 &ops);
1552         }
1553
1554         return result;
1555 }
1556
1557 int __init acpi_boot_ec_enable(void);
1558
1559 static int __init acpi_scan_init(void)
1560 {
1561         int result;
1562         struct acpi_bus_ops ops;
1563
1564
1565         if (acpi_disabled)
1566                 return 0;
1567
1568         memset(&ops, 0, sizeof(ops));
1569         ops.acpi_op_add = 1;
1570         ops.acpi_op_start = 1;
1571
1572         result = bus_register(&acpi_bus_type);
1573         if (result) {
1574                 /* We don't want to quit even if we failed to add suspend/resume */
1575                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1576         }
1577
1578         /*
1579          * Create the root device in the bus's device tree
1580          */
1581         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1582                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1583         if (result)
1584                 goto Done;
1585
1586         /*
1587          * Enumerate devices in the ACPI namespace.
1588          */
1589         result = acpi_bus_scan_fixed(acpi_root);
1590
1591         /* EC region might be needed at bus_scan, so enable it now */
1592         acpi_boot_ec_enable();
1593
1594         if (!result)
1595                 result = acpi_bus_scan(acpi_root, &ops);
1596
1597         if (result)
1598                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1599
1600       Done:
1601         return result;
1602 }
1603
1604 subsys_initcall(acpi_scan_init);