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/slab.h>
   8 #include <linux/kernel.h>
   9 #include <linux/acpi.h>
  10 #include <linux/signal.h>
  11 #include <linux/kthread.h>
  12 #include <linux/dmi.h>
  13
  14 #include <acpi/acpi_drivers.h>
  15
  16 #include "internal.h"
  17
  18 #define _COMPONENT              ACPI_BUS_COMPONENT
  19 ACPI_MODULE_NAME("scan");
  20 #define STRUCT_TO_INT(s)        (*((int*)&s))
  21 extern struct acpi_device *acpi_root;
  22
  23 #define ACPI_BUS_CLASS                  "system_bus"
  24 #define ACPI_BUS_HID                    "LNXSYBUS"
  25 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  26
  27 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  28
  29 /* Should be const */
  30 static char* dummy_hid = "device";
  31
  32 static LIST_HEAD(acpi_device_list);
  33 static LIST_HEAD(acpi_bus_id_list);
  34 DEFINE_MUTEX(acpi_device_lock);
  35 LIST_HEAD(acpi_wakeup_device_list);
  36
  37 struct acpi_device_bus_id{
  38         char bus_id[15];
  39         unsigned int instance_no;
  40         struct list_head node;
  41 };
  42
  43 /*
  44  * Creates hid/cid(s) string needed for modalias and uevent
  45  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  46  * char *modalias: "acpi:IBM0001:ACPI0001"
  47 */
  48 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  49                            int size)
  50 {
  51         int len;
  52         int count;
  53         struct acpi_hardware_id *id;
  54
  55         if (list_empty(&acpi_dev->pnp.ids))
  56                 return 0;
  57
  58         len = snprintf(modalias, size, "acpi:");
  59         size -= len;
  60
  61         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
  62                 count = snprintf(&modalias[len], size, "%s:", id->id);
  63                 if (count < 0 || count >= size)
  64                         return -EINVAL;
  65                 len += count;
  66                 size -= count;
  67         }
  68
  69         modalias[len] = '\0';
  70         return len;
  71 }
  72
  73 static ssize_t
  74 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  75         struct acpi_device *acpi_dev = to_acpi_device(dev);
  76         int len;
  77
  78         /* Device has no HID and no CID or string is >1024 */
  79         len = create_modalias(acpi_dev, buf, 1024);
  80         if (len <= 0)
  81                 return 0;
  82         buf[len++] = '\n';
  83         return len;
  84 }
  85 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  86
  87 static void acpi_bus_hot_remove_device(void *context)
  88 {
  89         struct acpi_device *device;
  90         acpi_handle handle = context;
  91         struct acpi_object_list arg_list;
  92         union acpi_object arg;
  93         acpi_status status = AE_OK;
  94
  95         if (acpi_bus_get_device(handle, &device))
  96                 return;
  97
  98         if (!device)
  99                 return;
 100
 101         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 102                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 103
 104         if (acpi_bus_trim(device, 1)) {
 105                 printk(KERN_ERR PREFIX
 106                                 "Removing device failed\n");
 107                 return;
 108         }
 109
 110         /* power off device */
 111         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 112         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 113                 printk(KERN_WARNING PREFIX
 114                                 "Power-off device failed\n");
 115
 116         if (device->flags.lockable) {
 117                 arg_list.count = 1;
 118                 arg_list.pointer = &arg;
 119                 arg.type = ACPI_TYPE_INTEGER;
 120                 arg.integer.value = 0;
 121                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 122         }
 123
 124         arg_list.count = 1;
 125         arg_list.pointer = &arg;
 126         arg.type = ACPI_TYPE_INTEGER;
 127         arg.integer.value = 1;
 128
 129         /*
 130          * TBD: _EJD support.
 131          */
 132         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 133         if (ACPI_FAILURE(status))
 134                 printk(KERN_WARNING PREFIX
 135                                 "Eject device failed\n");
 136
 137         return;
 138 }
 139
 140 static ssize_t
 141 acpi_eject_store(struct device *d, struct device_attribute *attr,
 142                 const char *buf, size_t count)
 143 {
 144         int ret = count;
 145         acpi_status status;
 146         acpi_object_type type = 0;
 147         struct acpi_device *acpi_device = to_acpi_device(d);
 148
 149         if ((!count) || (buf[0] != '1')) {
 150                 return -EINVAL;
 151         }
 152 #ifndef FORCE_EJECT
 153         if (acpi_device->driver == NULL) {
 154                 ret = -ENODEV;
 155                 goto err;
 156         }
 157 #endif
 158         status = acpi_get_type(acpi_device->handle, &type);
 159         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 160                 ret = -ENODEV;
 161                 goto err;
 162         }
 163
 164         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
 165 err:
 166         return ret;
 167 }
 168
 169 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 170
 171 static ssize_t
 172 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 173         struct acpi_device *acpi_dev = to_acpi_device(dev);
 174
 175         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 176 }
 177 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 178
 179 static ssize_t
 180 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 181         struct acpi_device *acpi_dev = to_acpi_device(dev);
 182         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 183         int result;
 184
 185         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 186         if (result)
 187                 goto end;
 188
 189         result = sprintf(buf, "%s\n", (char*)path.pointer);
 190         kfree(path.pointer);
 191 end:
 192         return result;
 193 }
 194 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 195
 196 static int acpi_device_setup_files(struct acpi_device *dev)
 197 {
 198         acpi_status status;
 199         acpi_handle temp;
 200         int result = 0;
 201
 202         /*
 203          * Devices gotten from FADT don't have a "path" attribute
 204          */
 205         if (dev->handle) {
 206                 result = device_create_file(&dev->dev, &dev_attr_path);
 207                 if (result)
 208                         goto end;
 209         }
 210
 211         if (!list_empty(&dev->pnp.ids)) {
 212                 result = device_create_file(&dev->dev, &dev_attr_hid);
 213                 if (result)
 214                         goto end;
 215
 216                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 217                 if (result)
 218                         goto end;
 219         }
 220
 221         /*
 222          * If device has _EJ0, 'eject' file is created that is used to trigger
 223          * hot-removal function from userland.
 224          */
 225         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 226         if (ACPI_SUCCESS(status))
 227                 result = device_create_file(&dev->dev, &dev_attr_eject);
 228 end:
 229         return result;
 230 }
 231
 232 static void acpi_device_remove_files(struct acpi_device *dev)
 233 {
 234         acpi_status status;
 235         acpi_handle temp;
 236
 237         /*
 238          * If device has _EJ0, 'eject' file is created that is used to trigger
 239          * hot-removal function from userland.
 240          */
 241         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 242         if (ACPI_SUCCESS(status))
 243                 device_remove_file(&dev->dev, &dev_attr_eject);
 244
 245         device_remove_file(&dev->dev, &dev_attr_modalias);
 246         device_remove_file(&dev->dev, &dev_attr_hid);
 247         if (dev->handle)
 248                 device_remove_file(&dev->dev, &dev_attr_path);
 249 }
 250 /* --------------------------------------------------------------------------
 251                         ACPI Bus operations
 252    -------------------------------------------------------------------------- */
 253
 254 int acpi_match_device_ids(struct acpi_device *device,
 255                           const struct acpi_device_id *ids)
 256 {
 257         const struct acpi_device_id *id;
 258         struct acpi_hardware_id *hwid;
 259
 260         /*
 261          * If the device is not present, it is unnecessary to load device
 262          * driver for it.
 263          */
 264         if (!device->status.present)
 265                 return -ENODEV;
 266
 267         for (id = ids; id->id[0]; id++)
 268                 list_for_each_entry(hwid, &device->pnp.ids, list)
 269                         if (!strcmp((char *) id->id, hwid->id))
 270                                 return 0;
 271
 272         return -ENOENT;
 273 }
 274 EXPORT_SYMBOL(acpi_match_device_ids);
 275
 276 static void acpi_free_ids(struct acpi_device *device)
 277 {
 278         struct acpi_hardware_id *id, *tmp;
 279
 280         list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
 281                 kfree(id->id);
 282                 kfree(id);
 283         }
 284 }
 285
 286 static void acpi_device_release(struct device *dev)
 287 {
 288         struct acpi_device *acpi_dev = to_acpi_device(dev);
 289
 290         acpi_free_ids(acpi_dev);
 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 (list_empty(&acpi_dev->pnp.ids))
 328                 return 0;
 329
 330         if (add_uevent_var(env, "MODALIAS="))
 331                 return -ENOMEM;
 332         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 333                               sizeof(env->buf) - env->buflen);
 334         if (len >= (sizeof(env->buf) - env->buflen))
 335                 return -ENOMEM;
 336         env->buflen += len;
 337         return 0;
 338 }
 339
 340 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 341 {
 342         struct acpi_device *device = data;
 343
 344         device->driver->ops.notify(device, event);
 345 }
 346
 347 static acpi_status acpi_device_notify_fixed(void *data)
 348 {
 349         struct acpi_device *device = data;
 350
 351         /* Fixed hardware devices have no handles */
 352         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 353         return AE_OK;
 354 }
 355
 356 static int acpi_device_install_notify_handler(struct acpi_device *device)
 357 {
 358         acpi_status status;
 359
 360         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 361                 status =
 362                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 363                                                      acpi_device_notify_fixed,
 364                                                      device);
 365         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 366                 status =
 367                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 368                                                      acpi_device_notify_fixed,
 369                                                      device);
 370         else
 371                 status = acpi_install_notify_handler(device->handle,
 372                                                      ACPI_DEVICE_NOTIFY,
 373                                                      acpi_device_notify,
 374                                                      device);
 375
 376         if (ACPI_FAILURE(status))
 377                 return -EINVAL;
 378         return 0;
 379 }
 380
 381 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 382 {
 383         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 384                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 385                                                 acpi_device_notify_fixed);
 386         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 387                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 388                                                 acpi_device_notify_fixed);
 389         else
 390                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 391                                            acpi_device_notify);
 392 }
 393
 394 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 395 static int acpi_start_single_object(struct acpi_device *);
 396 static int acpi_device_probe(struct device * dev)
 397 {
 398         struct acpi_device *acpi_dev = to_acpi_device(dev);
 399         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 400         int ret;
 401
 402         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 403         if (!ret) {
 404                 if (acpi_dev->bus_ops.acpi_op_start)
 405                         acpi_start_single_object(acpi_dev);
 406
 407                 if (acpi_drv->ops.notify) {
 408                         ret = acpi_device_install_notify_handler(acpi_dev);
 409                         if (ret) {
 410                                 if (acpi_drv->ops.remove)
 411                                         acpi_drv->ops.remove(acpi_dev,
 412                                                      acpi_dev->removal_type);
 413                                 return ret;
 414                         }
 415                 }
 416
 417                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 418                         "Found driver [%s] for device [%s]\n",
 419                         acpi_drv->name, acpi_dev->pnp.bus_id));
 420                 get_device(dev);
 421         }
 422         return ret;
 423 }
 424
 425 static int acpi_device_remove(struct device * dev)
 426 {
 427         struct acpi_device *acpi_dev = to_acpi_device(dev);
 428         struct acpi_driver *acpi_drv = acpi_dev->driver;
 429
 430         if (acpi_drv) {
 431                 if (acpi_drv->ops.notify)
 432                         acpi_device_remove_notify_handler(acpi_dev);
 433                 if (acpi_drv->ops.remove)
 434                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 435         }
 436         acpi_dev->driver = NULL;
 437         acpi_dev->driver_data = NULL;
 438
 439         put_device(dev);
 440         return 0;
 441 }
 442
 443 struct bus_type acpi_bus_type = {
 444         .name           = "acpi",
 445         .suspend        = acpi_device_suspend,
 446         .resume         = acpi_device_resume,
 447         .match          = acpi_bus_match,
 448         .probe          = acpi_device_probe,
 449         .remove         = acpi_device_remove,
 450         .uevent         = acpi_device_uevent,
 451 };
 452
 453 static int acpi_device_register(struct acpi_device *device)
 454 {
 455         int result;
 456         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 457         int found = 0;
 458
 459         /*
 460          * Linkage
 461          * -------
 462          * Link this device to its parent and siblings.
 463          */
 464         INIT_LIST_HEAD(&device->children);
 465         INIT_LIST_HEAD(&device->node);
 466         INIT_LIST_HEAD(&device->wakeup_list);
 467
 468         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 469         if (!new_bus_id) {
 470                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 471                 return -ENOMEM;
 472         }
 473
 474         mutex_lock(&acpi_device_lock);
 475         /*
 476          * Find suitable bus_id and instance number in acpi_bus_id_list
 477          * If failed, create one and link it into acpi_bus_id_list
 478          */
 479         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 480                 if (!strcmp(acpi_device_bus_id->bus_id,
 481                             acpi_device_hid(device))) {
 482                         acpi_device_bus_id->instance_no++;
 483                         found = 1;
 484                         kfree(new_bus_id);
 485                         break;
 486                 }
 487         }
 488         if (!found) {
 489                 acpi_device_bus_id = new_bus_id;
 490                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 491                 acpi_device_bus_id->instance_no = 0;
 492                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 493         }
 494         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 495
 496         if (device->parent)
 497                 list_add_tail(&device->node, &device->parent->children);
 498
 499         if (device->wakeup.flags.valid)
 500                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 501         mutex_unlock(&acpi_device_lock);
 502
 503         if (device->parent)
 504                 device->dev.parent = &device->parent->dev;
 505         device->dev.bus = &acpi_bus_type;
 506         device->dev.release = &acpi_device_release;
 507         result = device_register(&device->dev);
 508         if (result) {
 509                 dev_err(&device->dev, "Error registering device\n");
 510                 goto end;
 511         }
 512
 513         result = acpi_device_setup_files(device);
 514         if (result)
 515                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 516                        dev_name(&device->dev));
 517
 518         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 519         return 0;
 520 end:
 521         mutex_lock(&acpi_device_lock);
 522         if (device->parent)
 523                 list_del(&device->node);
 524         list_del(&device->wakeup_list);
 525         mutex_unlock(&acpi_device_lock);
 526         return result;
 527 }
 528
 529 static void acpi_device_unregister(struct acpi_device *device, int type)
 530 {
 531         mutex_lock(&acpi_device_lock);
 532         if (device->parent)
 533                 list_del(&device->node);
 534
 535         list_del(&device->wakeup_list);
 536         mutex_unlock(&acpi_device_lock);
 537
 538         acpi_detach_data(device->handle, acpi_bus_data_handler);
 539
 540         acpi_device_remove_files(device);
 541         device_unregister(&device->dev);
 542 }
 543
 544 /* --------------------------------------------------------------------------
 545                                  Driver Management
 546    -------------------------------------------------------------------------- */
 547 /**
 548  * acpi_bus_driver_init - add a device to a driver
 549  * @device: the device to add and initialize
 550  * @driver: driver for the device
 551  *
 552  * Used to initialize a device via its device driver.  Called whenever a
 553  * driver is bound to a device.  Invokes the driver's add() ops.
 554  */
 555 static int
 556 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 557 {
 558         int result = 0;
 559
 560         if (!device || !driver)
 561                 return -EINVAL;
 562
 563         if (!driver->ops.add)
 564                 return -ENOSYS;
 565
 566         result = driver->ops.add(device);
 567         if (result) {
 568                 device->driver = NULL;
 569                 device->driver_data = NULL;
 570                 return result;
 571         }
 572
 573         device->driver = driver;
 574
 575         /*
 576          * TBD - Configuration Management: Assign resources to device based
 577          * upon possible configuration and currently allocated resources.
 578          */
 579
 580         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 581                           "Driver successfully bound to device\n"));
 582         return 0;
 583 }
 584
 585 static int acpi_start_single_object(struct acpi_device *device)
 586 {
 587         int result = 0;
 588         struct acpi_driver *driver;
 589
 590
 591         if (!(driver = device->driver))
 592                 return 0;
 593
 594         if (driver->ops.start) {
 595                 result = driver->ops.start(device);
 596                 if (result && driver->ops.remove)
 597                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 598         }
 599
 600         return result;
 601 }
 602
 603 /**
 604  * acpi_bus_register_driver - register a driver with the ACPI bus
 605  * @driver: driver being registered
 606  *
 607  * Registers a driver with the ACPI bus.  Searches the namespace for all
 608  * devices that match the driver's criteria and binds.  Returns zero for
 609  * success or a negative error status for failure.
 610  */
 611 int acpi_bus_register_driver(struct acpi_driver *driver)
 612 {
 613         int ret;
 614
 615         if (acpi_disabled)
 616                 return -ENODEV;
 617         driver->drv.name = driver->name;
 618         driver->drv.bus = &acpi_bus_type;
 619         driver->drv.owner = driver->owner;
 620
 621         ret = driver_register(&driver->drv);
 622         return ret;
 623 }
 624
 625 EXPORT_SYMBOL(acpi_bus_register_driver);
 626
 627 /**
 628  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 629  * @driver: driver to unregister
 630  *
 631  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 632  * devices that match the driver's criteria and unbinds.
 633  */
 634 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 635 {
 636         driver_unregister(&driver->drv);
 637 }
 638
 639 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 640
 641 /* --------------------------------------------------------------------------
 642                                  Device Enumeration
 643    -------------------------------------------------------------------------- */
 644 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 645 {
 646         acpi_status status;
 647         int ret;
 648         struct acpi_device *device;
 649
 650         /*
 651          * Fixed hardware devices do not appear in the namespace and do not
 652          * have handles, but we fabricate acpi_devices for them, so we have
 653          * to deal with them specially.
 654          */
 655         if (handle == NULL)
 656                 return acpi_root;
 657
 658         do {
 659                 status = acpi_get_parent(handle, &handle);
 660                 if (status == AE_NULL_ENTRY)
 661                         return NULL;
 662                 if (ACPI_FAILURE(status))
 663                         return acpi_root;
 664
 665                 ret = acpi_bus_get_device(handle, &device);
 666                 if (ret == 0)
 667                         return device;
 668         } while (1);
 669 }
 670
 671 acpi_status
 672 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 673 {
 674         acpi_status status;
 675         acpi_handle tmp;
 676         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 677         union acpi_object *obj;
 678
 679         status = acpi_get_handle(handle, "_EJD", &tmp);
 680         if (ACPI_FAILURE(status))
 681                 return status;
 682
 683         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 684         if (ACPI_SUCCESS(status)) {
 685                 obj = buffer.pointer;
 686                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 687                                          ejd);
 688                 kfree(buffer.pointer);
 689         }
 690         return status;
 691 }
 692 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 693
 694 void acpi_bus_data_handler(acpi_handle handle, void *context)
 695 {
 696
 697         /* TBD */
 698
 699         return;
 700 }
 701
 702 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 703 {
 704         device->performance.state = ACPI_STATE_UNKNOWN;
 705         return 0;
 706 }
 707
 708 static acpi_status
 709 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 710                                              union acpi_object *package)
 711 {
 712         int i = 0;
 713         union acpi_object *element = NULL;
 714
 715         if (!device || !package || (package->package.count < 2))
 716                 return AE_BAD_PARAMETER;
 717
 718         element = &(package->package.elements[0]);
 719         if (!element)
 720                 return AE_BAD_PARAMETER;
 721         if (element->type == ACPI_TYPE_PACKAGE) {
 722                 if ((element->package.count < 2) ||
 723                     (element->package.elements[0].type !=
 724                      ACPI_TYPE_LOCAL_REFERENCE)
 725                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 726                         return AE_BAD_DATA;
 727                 device->wakeup.gpe_device =
 728                     element->package.elements[0].reference.handle;
 729                 device->wakeup.gpe_number =
 730                     (u32) element->package.elements[1].integer.value;
 731         } else if (element->type == ACPI_TYPE_INTEGER) {
 732                 device->wakeup.gpe_number = element->integer.value;
 733         } else
 734                 return AE_BAD_DATA;
 735
 736         element = &(package->package.elements[1]);
 737         if (element->type != ACPI_TYPE_INTEGER) {
 738                 return AE_BAD_DATA;
 739         }
 740         device->wakeup.sleep_state = element->integer.value;
 741
 742         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 743                 return AE_NO_MEMORY;
 744         }
 745         device->wakeup.resources.count = package->package.count - 2;
 746         for (i = 0; i < device->wakeup.resources.count; i++) {
 747                 element = &(package->package.elements[i + 2]);
 748                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 749                         return AE_BAD_DATA;
 750
 751                 device->wakeup.resources.handles[i] = element->reference.handle;
 752         }
 753
 754         acpi_gpe_can_wake(device->wakeup.gpe_device, device->wakeup.gpe_number);
 755
 756         return AE_OK;
 757 }
 758
 759 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
 760 {
 761         struct acpi_device_id button_device_ids[] = {
 762                 {"PNP0C0D", 0},
 763                 {"PNP0C0C", 0},
 764                 {"PNP0C0E", 0},
 765                 {"", 0},
 766         };
 767         acpi_status status;
 768         acpi_event_status event_status;
 769
 770         device->wakeup.run_wake_count = 0;
 771         device->wakeup.flags.notifier_present = 0;
 772
 773         /* Power button, Lid switch always enable wakeup */
 774         if (!acpi_match_device_ids(device, button_device_ids)) {
 775                 device->wakeup.flags.run_wake = 1;
 776                 device->wakeup.flags.always_enabled = 1;
 777                 return;
 778         }
 779
 780         status = acpi_get_gpe_status(device->wakeup.gpe_device,
 781                                         device->wakeup.gpe_number,
 782                                                 &event_status);
 783         if (status == AE_OK)
 784                 device->wakeup.flags.run_wake =
 785                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
 786 }
 787
 788 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 789 {
 790         acpi_status status = 0;
 791         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 792         union acpi_object *package = NULL;
 793         int psw_error;
 794
 795         /* _PRW */
 796         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 797         if (ACPI_FAILURE(status)) {
 798                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 799                 goto end;
 800         }
 801
 802         package = (union acpi_object *)buffer.pointer;
 803         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 804         if (ACPI_FAILURE(status)) {
 805                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 806                 goto end;
 807         }
 808
 809         kfree(buffer.pointer);
 810
 811         device->wakeup.flags.valid = 1;
 812         device->wakeup.prepare_count = 0;
 813         acpi_bus_set_run_wake_flags(device);
 814         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 815          * system for the ACPI device with the _PRW object.
 816          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 817          * So it is necessary to call _DSW object first. Only when it is not
 818          * present will the _PSW object used.
 819          */
 820         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 821         if (psw_error)
 822                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 823                                 "error in _DSW or _PSW evaluation\n"));
 824
 825 end:
 826         if (ACPI_FAILURE(status))
 827                 device->flags.wake_capable = 0;
 828         return 0;
 829 }
 830
 831 static int acpi_bus_get_power_flags(struct acpi_device *device)
 832 {
 833         acpi_status status = 0;
 834         acpi_handle handle = NULL;
 835         u32 i = 0;
 836
 837
 838         /*
 839          * Power Management Flags
 840          */
 841         status = acpi_get_handle(device->handle, "_PSC", &handle);
 842         if (ACPI_SUCCESS(status))
 843                 device->power.flags.explicit_get = 1;
 844         status = acpi_get_handle(device->handle, "_IRC", &handle);
 845         if (ACPI_SUCCESS(status))
 846                 device->power.flags.inrush_current = 1;
 847
 848         /*
 849          * Enumerate supported power management states
 850          */
 851         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 852                 struct acpi_device_power_state *ps = &device->power.states[i];
 853                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 854
 855                 /* Evaluate "_PRx" to se if power resources are referenced */
 856                 acpi_evaluate_reference(device->handle, object_name, NULL,
 857                                         &ps->resources);
 858                 if (ps->resources.count) {
 859                         device->power.flags.power_resources = 1;
 860                         ps->flags.valid = 1;
 861                 }
 862
 863                 /* Evaluate "_PSx" to see if we can do explicit sets */
 864                 object_name[2] = 'S';
 865                 status = acpi_get_handle(device->handle, object_name, &handle);
 866                 if (ACPI_SUCCESS(status)) {
 867                         ps->flags.explicit_set = 1;
 868                         ps->flags.valid = 1;
 869                 }
 870
 871                 /* State is valid if we have some power control */
 872                 if (ps->resources.count || ps->flags.explicit_set)
 873                         ps->flags.valid = 1;
 874
 875                 ps->power = -1; /* Unknown - driver assigned */
 876                 ps->latency = -1;       /* Unknown - driver assigned */
 877         }
 878
 879         /* Set defaults for D0 and D3 states (always valid) */
 880         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 881         device->power.states[ACPI_STATE_D0].power = 100;
 882         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 883         device->power.states[ACPI_STATE_D3].power = 0;
 884
 885         /* TBD: System wake support and resource requirements. */
 886
 887         device->power.state = ACPI_STATE_UNKNOWN;
 888         acpi_bus_get_power(device->handle, &(device->power.state));
 889
 890         return 0;
 891 }
 892
 893 static int acpi_bus_get_flags(struct acpi_device *device)
 894 {
 895         acpi_status status = AE_OK;
 896         acpi_handle temp = NULL;
 897
 898
 899         /* Presence of _STA indicates 'dynamic_status' */
 900         status = acpi_get_handle(device->handle, "_STA", &temp);
 901         if (ACPI_SUCCESS(status))
 902                 device->flags.dynamic_status = 1;
 903
 904         /* Presence of _RMV indicates 'removable' */
 905         status = acpi_get_handle(device->handle, "_RMV", &temp);
 906         if (ACPI_SUCCESS(status))
 907                 device->flags.removable = 1;
 908
 909         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 910         status = acpi_get_handle(device->handle, "_EJD", &temp);
 911         if (ACPI_SUCCESS(status))
 912                 device->flags.ejectable = 1;
 913         else {
 914                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 915                 if (ACPI_SUCCESS(status))
 916                         device->flags.ejectable = 1;
 917         }
 918
 919         /* Presence of _LCK indicates 'lockable' */
 920         status = acpi_get_handle(device->handle, "_LCK", &temp);
 921         if (ACPI_SUCCESS(status))
 922                 device->flags.lockable = 1;
 923
 924         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 925         status = acpi_get_handle(device->handle, "_PS0", &temp);
 926         if (ACPI_FAILURE(status))
 927                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 928         if (ACPI_SUCCESS(status))
 929                 device->flags.power_manageable = 1;
 930
 931         /* Presence of _PRW indicates wake capable */
 932         status = acpi_get_handle(device->handle, "_PRW", &temp);
 933         if (ACPI_SUCCESS(status))
 934                 device->flags.wake_capable = 1;
 935
 936         /* TBD: Performance management */
 937
 938         return 0;
 939 }
 940
 941 static void acpi_device_get_busid(struct acpi_device *device)
 942 {
 943         char bus_id[5] = { '?', 0 };
 944         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 945         int i = 0;
 946
 947         /*
 948          * Bus ID
 949          * ------
 950          * The device's Bus ID is simply the object name.
 951          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 952          */
 953         if (ACPI_IS_ROOT_DEVICE(device)) {
 954                 strcpy(device->pnp.bus_id, "ACPI");
 955                 return;
 956         }
 957
 958         switch (device->device_type) {
 959         case ACPI_BUS_TYPE_POWER_BUTTON:
 960                 strcpy(device->pnp.bus_id, "PWRF");
 961                 break;
 962         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 963                 strcpy(device->pnp.bus_id, "SLPF");
 964                 break;
 965         default:
 966                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
 967                 /* Clean up trailing underscores (if any) */
 968                 for (i = 3; i > 1; i--) {
 969                         if (bus_id[i] == '_')
 970                                 bus_id[i] = '\0';
 971                         else
 972                                 break;
 973                 }
 974                 strcpy(device->pnp.bus_id, bus_id);
 975                 break;
 976         }
 977 }
 978
 979 /*
 980  * acpi_bay_match - see if a device is an ejectable driver bay
 981  *
 982  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 983  * then we can safely call it an ejectable drive bay
 984  */
 985 static int acpi_bay_match(struct acpi_device *device){
 986         acpi_status status;
 987         acpi_handle handle;
 988         acpi_handle tmp;
 989         acpi_handle phandle;
 990
 991         handle = device->handle;
 992
 993         status = acpi_get_handle(handle, "_EJ0", &tmp);
 994         if (ACPI_FAILURE(status))
 995                 return -ENODEV;
 996
 997         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 998                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 999                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1000                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1001                 return 0;
1002
1003         if (acpi_get_parent(handle, &phandle))
1004                 return -ENODEV;
1005
1006         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1007                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1008                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1009                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1010                 return 0;
1011
1012         return -ENODEV;
1013 }
1014
1015 /*
1016  * acpi_dock_match - see if a device has a _DCK method
1017  */
1018 static int acpi_dock_match(struct acpi_device *device)
1019 {
1020         acpi_handle tmp;
1021         return acpi_get_handle(device->handle, "_DCK", &tmp);
1022 }
1023
1024 char *acpi_device_hid(struct acpi_device *device)
1025 {
1026         struct acpi_hardware_id *hid;
1027
1028         if (list_empty(&device->pnp.ids))
1029                 return dummy_hid;
1030
1031         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1032         return hid->id;
1033 }
1034 EXPORT_SYMBOL(acpi_device_hid);
1035
1036 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1037 {
1038         struct acpi_hardware_id *id;
1039
1040         id = kmalloc(sizeof(*id), GFP_KERNEL);
1041         if (!id)
1042                 return;
1043
1044         id->id = kmalloc(strlen(dev_id) + 1, GFP_KERNEL);
1045         if (!id->id) {
1046                 kfree(id);
1047                 return;
1048         }
1049
1050         strcpy(id->id, dev_id);
1051         list_add_tail(&id->list, &device->pnp.ids);
1052 }
1053
1054 /*
1055  * Old IBM workstations have a DSDT bug wherein the SMBus object
1056  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1057  * prefix.  Work around this.
1058  */
1059 static int acpi_ibm_smbus_match(struct acpi_device *device)
1060 {
1061         acpi_handle h_dummy;
1062         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1063         int result;
1064
1065         if (!dmi_name_in_vendors("IBM"))
1066                 return -ENODEV;
1067
1068         /* Look for SMBS object */
1069         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1070         if (result)
1071                 return result;
1072
1073         if (strcmp("SMBS", path.pointer)) {
1074                 result = -ENODEV;
1075                 goto out;
1076         }
1077
1078         /* Does it have the necessary (but misnamed) methods? */
1079         result = -ENODEV;
1080         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1081             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1082             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1083                 result = 0;
1084 out:
1085         kfree(path.pointer);
1086         return result;
1087 }
1088
1089 static void acpi_device_set_id(struct acpi_device *device)
1090 {
1091         acpi_status status;
1092         struct acpi_device_info *info;
1093         struct acpica_device_id_list *cid_list;
1094         int i;
1095
1096         switch (device->device_type) {
1097         case ACPI_BUS_TYPE_DEVICE:
1098                 if (ACPI_IS_ROOT_DEVICE(device)) {
1099                         acpi_add_id(device, ACPI_SYSTEM_HID);
1100                         break;
1101                 }
1102
1103                 status = acpi_get_object_info(device->handle, &info);
1104                 if (ACPI_FAILURE(status)) {
1105                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1106                         return;
1107                 }
1108
1109                 if (info->valid & ACPI_VALID_HID)
1110                         acpi_add_id(device, info->hardware_id.string);
1111                 if (info->valid & ACPI_VALID_CID) {
1112                         cid_list = &info->compatible_id_list;
1113                         for (i = 0; i < cid_list->count; i++)
1114                                 acpi_add_id(device, cid_list->ids[i].string);
1115                 }
1116                 if (info->valid & ACPI_VALID_ADR) {
1117                         device->pnp.bus_address = info->address;
1118                         device->flags.bus_address = 1;
1119                 }
1120
1121                 kfree(info);
1122
1123                 /*
1124                  * Some devices don't reliably have _HIDs & _CIDs, so add
1125                  * synthetic HIDs to make sure drivers can find them.
1126                  */
1127                 if (acpi_is_video_device(device))
1128                         acpi_add_id(device, ACPI_VIDEO_HID);
1129                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1130                         acpi_add_id(device, ACPI_BAY_HID);
1131                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1132                         acpi_add_id(device, ACPI_DOCK_HID);
1133                 else if (!acpi_ibm_smbus_match(device))
1134                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1135                 else if (!acpi_device_hid(device) &&
1136                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1137                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1138                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1139                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1140                 }
1141
1142                 break;
1143         case ACPI_BUS_TYPE_POWER:
1144                 acpi_add_id(device, ACPI_POWER_HID);
1145                 break;
1146         case ACPI_BUS_TYPE_PROCESSOR:
1147                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1148                 break;
1149         case ACPI_BUS_TYPE_THERMAL:
1150                 acpi_add_id(device, ACPI_THERMAL_HID);
1151                 break;
1152         case ACPI_BUS_TYPE_POWER_BUTTON:
1153                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1154                 break;
1155         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1156                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1157                 break;
1158         }
1159 }
1160
1161 static int acpi_device_set_context(struct acpi_device *device)
1162 {
1163         acpi_status status;
1164
1165         /*
1166          * Context
1167          * -------
1168          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1169          * resolutions from handle->device very efficient.  Fixed hardware
1170          * devices have no handles, so we skip them.
1171          */
1172         if (!device->handle)
1173                 return 0;
1174
1175         status = acpi_attach_data(device->handle,
1176                                   acpi_bus_data_handler, device);
1177         if (ACPI_SUCCESS(status))
1178                 return 0;
1179
1180         printk(KERN_ERR PREFIX "Error attaching device data\n");
1181         return -ENODEV;
1182 }
1183
1184 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1185 {
1186         if (!dev)
1187                 return -EINVAL;
1188
1189         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1190         device_release_driver(&dev->dev);
1191
1192         if (!rmdevice)
1193                 return 0;
1194
1195         /*
1196          * unbind _ADR-Based Devices when hot removal
1197          */
1198         if (dev->flags.bus_address) {
1199                 if ((dev->parent) && (dev->parent->ops.unbind))
1200                         dev->parent->ops.unbind(dev);
1201         }
1202         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1203
1204         return 0;
1205 }
1206
1207 static int acpi_add_single_object(struct acpi_device **child,
1208                                   acpi_handle handle, int type,
1209                                   unsigned long long sta,
1210                                   struct acpi_bus_ops *ops)
1211 {
1212         int result;
1213         struct acpi_device *device;
1214         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1215
1216         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1217         if (!device) {
1218                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1219                 return -ENOMEM;
1220         }
1221
1222         INIT_LIST_HEAD(&device->pnp.ids);
1223         device->device_type = type;
1224         device->handle = handle;
1225         device->parent = acpi_bus_get_parent(handle);
1226         device->bus_ops = *ops; /* workround for not call .start */
1227         STRUCT_TO_INT(device->status) = sta;
1228
1229         acpi_device_get_busid(device);
1230
1231         /*
1232          * Flags
1233          * -----
1234          * Note that we only look for object handles -- cannot evaluate objects
1235          * until we know the device is present and properly initialized.
1236          */
1237         result = acpi_bus_get_flags(device);
1238         if (result)
1239                 goto end;
1240
1241         /*
1242          * Initialize Device
1243          * -----------------
1244          * TBD: Synch with Core's enumeration/initialization process.
1245          */
1246         acpi_device_set_id(device);
1247
1248         /*
1249          * Power Management
1250          * ----------------
1251          */
1252         if (device->flags.power_manageable) {
1253                 result = acpi_bus_get_power_flags(device);
1254                 if (result)
1255                         goto end;
1256         }
1257
1258         /*
1259          * Wakeup device management
1260          *-----------------------
1261          */
1262         if (device->flags.wake_capable) {
1263                 result = acpi_bus_get_wakeup_device_flags(device);
1264                 if (result)
1265                         goto end;
1266         }
1267
1268         /*
1269          * Performance Management
1270          * ----------------------
1271          */
1272         if (device->flags.performance_manageable) {
1273                 result = acpi_bus_get_perf_flags(device);
1274                 if (result)
1275                         goto end;
1276         }
1277
1278         if ((result = acpi_device_set_context(device)))
1279                 goto end;
1280
1281         result = acpi_device_register(device);
1282
1283         /*
1284          * Bind _ADR-Based Devices when hot add
1285          */
1286         if (device->flags.bus_address) {
1287                 if (device->parent && device->parent->ops.bind)
1288                         device->parent->ops.bind(device);
1289         }
1290
1291 end:
1292         if (!result) {
1293                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1294                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1295                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1296                          (char *) buffer.pointer,
1297                          device->parent ? dev_name(&device->parent->dev) :
1298                                           "(null)"));
1299                 kfree(buffer.pointer);
1300                 *child = device;
1301         } else
1302                 acpi_device_release(&device->dev);
1303
1304         return result;
1305 }
1306
1307 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1308                           ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
1309
1310 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1311                                     unsigned long long *sta)
1312 {
1313         acpi_status status;
1314         acpi_object_type acpi_type;
1315
1316         status = acpi_get_type(handle, &acpi_type);
1317         if (ACPI_FAILURE(status))
1318                 return -ENODEV;
1319
1320         switch (acpi_type) {
1321         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1322         case ACPI_TYPE_DEVICE:
1323                 *type = ACPI_BUS_TYPE_DEVICE;
1324                 status = acpi_bus_get_status_handle(handle, sta);
1325                 if (ACPI_FAILURE(status))
1326                         return -ENODEV;
1327                 break;
1328         case ACPI_TYPE_PROCESSOR:
1329                 *type = ACPI_BUS_TYPE_PROCESSOR;
1330                 status = acpi_bus_get_status_handle(handle, sta);
1331                 if (ACPI_FAILURE(status))
1332                         return -ENODEV;
1333                 break;
1334         case ACPI_TYPE_THERMAL:
1335                 *type = ACPI_BUS_TYPE_THERMAL;
1336                 *sta = ACPI_STA_DEFAULT;
1337                 break;
1338         case ACPI_TYPE_POWER:
1339                 *type = ACPI_BUS_TYPE_POWER;
1340                 *sta = ACPI_STA_DEFAULT;
1341                 break;
1342         default:
1343                 return -ENODEV;
1344         }
1345
1346         return 0;
1347 }
1348
1349 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1350                                       void *context, void **return_value)
1351 {
1352         struct acpi_bus_ops *ops = context;
1353         int type;
1354         unsigned long long sta;
1355         struct acpi_device *device;
1356         acpi_status status;
1357         int result;
1358
1359         result = acpi_bus_type_and_status(handle, &type, &sta);
1360         if (result)
1361                 return AE_OK;
1362
1363         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1364             !(sta & ACPI_STA_DEVICE_FUNCTIONING))
1365                 return AE_CTRL_DEPTH;
1366
1367         /*
1368          * We may already have an acpi_device from a previous enumeration.  If
1369          * so, we needn't add it again, but we may still have to start it.
1370          */
1371         device = NULL;
1372         acpi_bus_get_device(handle, &device);
1373         if (ops->acpi_op_add && !device)
1374                 acpi_add_single_object(&device, handle, type, sta, ops);
1375
1376         if (!device)
1377                 return AE_CTRL_DEPTH;
1378
1379         if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1380                 status = acpi_start_single_object(device);
1381                 if (ACPI_FAILURE(status))
1382                         return AE_CTRL_DEPTH;
1383         }
1384
1385         if (!*return_value)
1386                 *return_value = device;
1387         return AE_OK;
1388 }
1389
1390 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1391                          struct acpi_device **child)
1392 {
1393         acpi_status status;
1394         void *device = NULL;
1395
1396         status = acpi_bus_check_add(handle, 0, ops, &device);
1397         if (ACPI_SUCCESS(status))
1398                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1399                                     acpi_bus_check_add, NULL, ops, &device);
1400
1401         if (child)
1402                 *child = device;
1403
1404         if (device)
1405                 return 0;
1406         else
1407                 return -ENODEV;
1408 }
1409
1410 /*
1411  * acpi_bus_add and acpi_bus_start
1412  *
1413  * scan a given ACPI tree and (probably recently hot-plugged)
1414  * create and add or starts found devices.
1415  *
1416  * If no devices were found -ENODEV is returned which does not
1417  * mean that this is a real error, there just have been no suitable
1418  * ACPI objects in the table trunk from which the kernel could create
1419  * a device and add/start an appropriate driver.
1420  */
1421
1422 int
1423 acpi_bus_add(struct acpi_device **child,
1424              struct acpi_device *parent, acpi_handle handle, int type)
1425 {
1426         struct acpi_bus_ops ops;
1427
1428         memset(&ops, 0, sizeof(ops));
1429         ops.acpi_op_add = 1;
1430
1431         return acpi_bus_scan(handle, &ops, child);
1432 }
1433 EXPORT_SYMBOL(acpi_bus_add);
1434
1435 int acpi_bus_start(struct acpi_device *device)
1436 {
1437         struct acpi_bus_ops ops;
1438
1439         if (!device)
1440                 return -EINVAL;
1441
1442         memset(&ops, 0, sizeof(ops));
1443         ops.acpi_op_start = 1;
1444
1445         return acpi_bus_scan(device->handle, &ops, NULL);
1446 }
1447 EXPORT_SYMBOL(acpi_bus_start);
1448
1449 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1450 {
1451         acpi_status status;
1452         struct acpi_device *parent, *child;
1453         acpi_handle phandle, chandle;
1454         acpi_object_type type;
1455         u32 level = 1;
1456         int err = 0;
1457
1458         parent = start;
1459         phandle = start->handle;
1460         child = chandle = NULL;
1461
1462         while ((level > 0) && parent && (!err)) {
1463                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1464                                               chandle, &chandle);
1465
1466                 /*
1467                  * If this scope is exhausted then move our way back up.
1468                  */
1469                 if (ACPI_FAILURE(status)) {
1470                         level--;
1471                         chandle = phandle;
1472                         acpi_get_parent(phandle, &phandle);
1473                         child = parent;
1474                         parent = parent->parent;
1475
1476                         if (level == 0)
1477                                 err = acpi_bus_remove(child, rmdevice);
1478                         else
1479                                 err = acpi_bus_remove(child, 1);
1480
1481                         continue;
1482                 }
1483
1484                 status = acpi_get_type(chandle, &type);
1485                 if (ACPI_FAILURE(status)) {
1486                         continue;
1487                 }
1488                 /*
1489                  * If there is a device corresponding to chandle then
1490                  * parse it (depth-first).
1491                  */
1492                 if (acpi_bus_get_device(chandle, &child) == 0) {
1493                         level++;
1494                         phandle = chandle;
1495                         chandle = NULL;
1496                         parent = child;
1497                 }
1498                 continue;
1499         }
1500         return err;
1501 }
1502 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1503
1504 static int acpi_bus_scan_fixed(void)
1505 {
1506         int result = 0;
1507         struct acpi_device *device = NULL;
1508         struct acpi_bus_ops ops;
1509
1510         memset(&ops, 0, sizeof(ops));
1511         ops.acpi_op_add = 1;
1512         ops.acpi_op_start = 1;
1513
1514         /*
1515          * Enumerate all fixed-feature devices.
1516          */
1517         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1518                 result = acpi_add_single_object(&device, NULL,
1519                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1520                                                 ACPI_STA_DEFAULT,
1521                                                 &ops);
1522         }
1523
1524         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1525                 result = acpi_add_single_object(&device, NULL,
1526                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1527                                                 ACPI_STA_DEFAULT,
1528                                                 &ops);
1529         }
1530
1531         return result;
1532 }
1533
1534 int __init acpi_scan_init(void)
1535 {
1536         int result;
1537         struct acpi_bus_ops ops;
1538
1539         memset(&ops, 0, sizeof(ops));
1540         ops.acpi_op_add = 1;
1541         ops.acpi_op_start = 1;
1542
1543         result = bus_register(&acpi_bus_type);
1544         if (result) {
1545                 /* We don't want to quit even if we failed to add suspend/resume */
1546                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1547         }
1548
1549         /*
1550          * Enumerate devices in the ACPI namespace.
1551          */
1552         result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1553
1554         if (!result)
1555                 result = acpi_bus_scan_fixed();
1556
1557         if (result)
1558                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1559
1560         return result;
1561 }