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 #include <linux/dmi.h>
  12
  13 #include <acpi/acpi_drivers.h>
  14
  15 #include "internal.h"
  16
  17 #define _COMPONENT              ACPI_BUS_COMPONENT
  18 ACPI_MODULE_NAME("scan");
  19 #define STRUCT_TO_INT(s)        (*((int*)&s))
  20 extern struct acpi_device *acpi_root;
  21
  22 #define ACPI_BUS_CLASS                  "system_bus"
  23 #define ACPI_BUS_HID                    "LNXSYBUS"
  24 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  25
  26 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  27
  28 static LIST_HEAD(acpi_device_list);
  29 static LIST_HEAD(acpi_bus_id_list);
  30 DEFINE_MUTEX(acpi_device_lock);
  31 LIST_HEAD(acpi_wakeup_device_list);
  32
  33 struct acpi_device_bus_id{
  34         char bus_id[15];
  35         unsigned int instance_no;
  36         struct list_head node;
  37 };
  38
  39 /*
  40  * Creates hid/cid(s) string needed for modalias and uevent
  41  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  42  * char *modalias: "acpi:IBM0001:ACPI0001"
  43 */
  44 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  45                            int size)
  46 {
  47         int len;
  48         int count;
  49         struct acpi_hardware_id *id;
  50
  51         len = snprintf(modalias, size, "acpi:");
  52         size -= len;
  53
  54         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
  55                 count = snprintf(&modalias[len], size, "%s:", id->id);
  56                 if (count < 0 || count >= size)
  57                         return -EINVAL;
  58                 len += count;
  59                 size -= count;
  60         }
  61
  62         modalias[len] = '\0';
  63         return len;
  64 }
  65
  66 static ssize_t
  67 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  68         struct acpi_device *acpi_dev = to_acpi_device(dev);
  69         int len;
  70
  71         /* Device has no HID and no CID or string is >1024 */
  72         len = create_modalias(acpi_dev, buf, 1024);
  73         if (len <= 0)
  74                 return 0;
  75         buf[len++] = '\n';
  76         return len;
  77 }
  78 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  79
  80 static void acpi_bus_hot_remove_device(void *context)
  81 {
  82         struct acpi_device *device;
  83         acpi_handle handle = context;
  84         struct acpi_object_list arg_list;
  85         union acpi_object arg;
  86         acpi_status status = AE_OK;
  87
  88         if (acpi_bus_get_device(handle, &device))
  89                 return;
  90
  91         if (!device)
  92                 return;
  93
  94         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  95                 "Hot-removing device %s...\n", dev_name(&device->dev)));
  96
  97         if (acpi_bus_trim(device, 1)) {
  98                 printk(KERN_ERR PREFIX
  99                                 "Removing device failed\n");
 100                 return;
 101         }
 102
 103         /* power off device */
 104         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 105         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 106                 printk(KERN_WARNING PREFIX
 107                                 "Power-off device failed\n");
 108
 109         if (device->flags.lockable) {
 110                 arg_list.count = 1;
 111                 arg_list.pointer = &arg;
 112                 arg.type = ACPI_TYPE_INTEGER;
 113                 arg.integer.value = 0;
 114                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 115         }
 116
 117         arg_list.count = 1;
 118         arg_list.pointer = &arg;
 119         arg.type = ACPI_TYPE_INTEGER;
 120         arg.integer.value = 1;
 121
 122         /*
 123          * TBD: _EJD support.
 124          */
 125         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 126         if (ACPI_FAILURE(status))
 127                 printk(KERN_WARNING PREFIX
 128                                 "Eject device failed\n");
 129
 130         return;
 131 }
 132
 133 static ssize_t
 134 acpi_eject_store(struct device *d, struct device_attribute *attr,
 135                 const char *buf, size_t count)
 136 {
 137         int ret = count;
 138         acpi_status status;
 139         acpi_object_type type = 0;
 140         struct acpi_device *acpi_device = to_acpi_device(d);
 141
 142         if ((!count) || (buf[0] != '1')) {
 143                 return -EINVAL;
 144         }
 145 #ifndef FORCE_EJECT
 146         if (acpi_device->driver == NULL) {
 147                 ret = -ENODEV;
 148                 goto err;
 149         }
 150 #endif
 151         status = acpi_get_type(acpi_device->handle, &type);
 152         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 153                 ret = -ENODEV;
 154                 goto err;
 155         }
 156
 157         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
 158 err:
 159         return ret;
 160 }
 161
 162 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 163
 164 static ssize_t
 165 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 166         struct acpi_device *acpi_dev = to_acpi_device(dev);
 167
 168         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 169 }
 170 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 171
 172 static ssize_t
 173 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 174         struct acpi_device *acpi_dev = to_acpi_device(dev);
 175         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 176         int result;
 177
 178         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 179         if (result)
 180                 goto end;
 181
 182         result = sprintf(buf, "%s\n", (char*)path.pointer);
 183         kfree(path.pointer);
 184 end:
 185         return result;
 186 }
 187 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 188
 189 static int acpi_device_setup_files(struct acpi_device *dev)
 190 {
 191         acpi_status status;
 192         acpi_handle temp;
 193         int result = 0;
 194
 195         /*
 196          * Devices gotten from FADT don't have a "path" attribute
 197          */
 198         if (dev->handle) {
 199                 result = device_create_file(&dev->dev, &dev_attr_path);
 200                 if (result)
 201                         goto end;
 202         }
 203
 204         result = device_create_file(&dev->dev, &dev_attr_hid);
 205         if (result)
 206                 goto end;
 207
 208         result = device_create_file(&dev->dev, &dev_attr_modalias);
 209         if (result)
 210                 goto end;
 211
 212         /*
 213          * If device has _EJ0, 'eject' file is created that is used to trigger
 214          * hot-removal function from userland.
 215          */
 216         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 217         if (ACPI_SUCCESS(status))
 218                 result = device_create_file(&dev->dev, &dev_attr_eject);
 219 end:
 220         return result;
 221 }
 222
 223 static void acpi_device_remove_files(struct acpi_device *dev)
 224 {
 225         acpi_status status;
 226         acpi_handle temp;
 227
 228         /*
 229          * If device has _EJ0, 'eject' file is created that is used to trigger
 230          * hot-removal function from userland.
 231          */
 232         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 233         if (ACPI_SUCCESS(status))
 234                 device_remove_file(&dev->dev, &dev_attr_eject);
 235
 236         device_remove_file(&dev->dev, &dev_attr_modalias);
 237         device_remove_file(&dev->dev, &dev_attr_hid);
 238         if (dev->handle)
 239                 device_remove_file(&dev->dev, &dev_attr_path);
 240 }
 241 /* --------------------------------------------------------------------------
 242                         ACPI Bus operations
 243    -------------------------------------------------------------------------- */
 244
 245 int acpi_match_device_ids(struct acpi_device *device,
 246                           const struct acpi_device_id *ids)
 247 {
 248         const struct acpi_device_id *id;
 249         struct acpi_hardware_id *hwid;
 250
 251         /*
 252          * If the device is not present, it is unnecessary to load device
 253          * driver for it.
 254          */
 255         if (!device->status.present)
 256                 return -ENODEV;
 257
 258         for (id = ids; id->id[0]; id++)
 259                 list_for_each_entry(hwid, &device->pnp.ids, list)
 260                         if (!strcmp((char *) id->id, hwid->id))
 261                                 return 0;
 262
 263         return -ENOENT;
 264 }
 265 EXPORT_SYMBOL(acpi_match_device_ids);
 266
 267 static void acpi_free_ids(struct acpi_device *device)
 268 {
 269         struct acpi_hardware_id *id, *tmp;
 270
 271         list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
 272                 kfree(id->id);
 273                 kfree(id);
 274         }
 275 }
 276
 277 static void acpi_device_release(struct device *dev)
 278 {
 279         struct acpi_device *acpi_dev = to_acpi_device(dev);
 280
 281         acpi_free_ids(acpi_dev);
 282         kfree(acpi_dev);
 283 }
 284
 285 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 286 {
 287         struct acpi_device *acpi_dev = to_acpi_device(dev);
 288         struct acpi_driver *acpi_drv = acpi_dev->driver;
 289
 290         if (acpi_drv && acpi_drv->ops.suspend)
 291                 return acpi_drv->ops.suspend(acpi_dev, state);
 292         return 0;
 293 }
 294
 295 static int acpi_device_resume(struct device *dev)
 296 {
 297         struct acpi_device *acpi_dev = to_acpi_device(dev);
 298         struct acpi_driver *acpi_drv = acpi_dev->driver;
 299
 300         if (acpi_drv && acpi_drv->ops.resume)
 301                 return acpi_drv->ops.resume(acpi_dev);
 302         return 0;
 303 }
 304
 305 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 306 {
 307         struct acpi_device *acpi_dev = to_acpi_device(dev);
 308         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 309
 310         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 311 }
 312
 313 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 314 {
 315         struct acpi_device *acpi_dev = to_acpi_device(dev);
 316         int len;
 317
 318         if (add_uevent_var(env, "MODALIAS="))
 319                 return -ENOMEM;
 320         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 321                               sizeof(env->buf) - env->buflen);
 322         if (len >= (sizeof(env->buf) - env->buflen))
 323                 return -ENOMEM;
 324         env->buflen += len;
 325         return 0;
 326 }
 327
 328 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 329 {
 330         struct acpi_device *device = data;
 331
 332         device->driver->ops.notify(device, event);
 333 }
 334
 335 static acpi_status acpi_device_notify_fixed(void *data)
 336 {
 337         struct acpi_device *device = data;
 338
 339         /* Fixed hardware devices have no handles */
 340         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 341         return AE_OK;
 342 }
 343
 344 static int acpi_device_install_notify_handler(struct acpi_device *device)
 345 {
 346         acpi_status status;
 347
 348         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 349                 status =
 350                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 351                                                      acpi_device_notify_fixed,
 352                                                      device);
 353         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 354                 status =
 355                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 356                                                      acpi_device_notify_fixed,
 357                                                      device);
 358         else
 359                 status = acpi_install_notify_handler(device->handle,
 360                                                      ACPI_DEVICE_NOTIFY,
 361                                                      acpi_device_notify,
 362                                                      device);
 363
 364         if (ACPI_FAILURE(status))
 365                 return -EINVAL;
 366         return 0;
 367 }
 368
 369 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 370 {
 371         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 372                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 373                                                 acpi_device_notify_fixed);
 374         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 375                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 376                                                 acpi_device_notify_fixed);
 377         else
 378                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 379                                            acpi_device_notify);
 380 }
 381
 382 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 383 static int acpi_start_single_object(struct acpi_device *);
 384 static int acpi_device_probe(struct device * dev)
 385 {
 386         struct acpi_device *acpi_dev = to_acpi_device(dev);
 387         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 388         int ret;
 389
 390         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 391         if (!ret) {
 392                 if (acpi_dev->bus_ops.acpi_op_start)
 393                         acpi_start_single_object(acpi_dev);
 394
 395                 if (acpi_drv->ops.notify) {
 396                         ret = acpi_device_install_notify_handler(acpi_dev);
 397                         if (ret) {
 398                                 if (acpi_drv->ops.remove)
 399                                         acpi_drv->ops.remove(acpi_dev,
 400                                                      acpi_dev->removal_type);
 401                                 return ret;
 402                         }
 403                 }
 404
 405                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 406                         "Found driver [%s] for device [%s]\n",
 407                         acpi_drv->name, acpi_dev->pnp.bus_id));
 408                 get_device(dev);
 409         }
 410         return ret;
 411 }
 412
 413 static int acpi_device_remove(struct device * dev)
 414 {
 415         struct acpi_device *acpi_dev = to_acpi_device(dev);
 416         struct acpi_driver *acpi_drv = acpi_dev->driver;
 417
 418         if (acpi_drv) {
 419                 if (acpi_drv->ops.notify)
 420                         acpi_device_remove_notify_handler(acpi_dev);
 421                 if (acpi_drv->ops.remove)
 422                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 423         }
 424         acpi_dev->driver = NULL;
 425         acpi_dev->driver_data = NULL;
 426
 427         put_device(dev);
 428         return 0;
 429 }
 430
 431 struct bus_type acpi_bus_type = {
 432         .name           = "acpi",
 433         .suspend        = acpi_device_suspend,
 434         .resume         = acpi_device_resume,
 435         .match          = acpi_bus_match,
 436         .probe          = acpi_device_probe,
 437         .remove         = acpi_device_remove,
 438         .uevent         = acpi_device_uevent,
 439 };
 440
 441 static int acpi_device_register(struct acpi_device *device)
 442 {
 443         int result;
 444         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 445         int found = 0;
 446
 447         /*
 448          * Linkage
 449          * -------
 450          * Link this device to its parent and siblings.
 451          */
 452         INIT_LIST_HEAD(&device->children);
 453         INIT_LIST_HEAD(&device->node);
 454         INIT_LIST_HEAD(&device->wakeup_list);
 455
 456         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 457         if (!new_bus_id) {
 458                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 459                 return -ENOMEM;
 460         }
 461
 462         mutex_lock(&acpi_device_lock);
 463         /*
 464          * Find suitable bus_id and instance number in acpi_bus_id_list
 465          * If failed, create one and link it into acpi_bus_id_list
 466          */
 467         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 468                 if (!strcmp(acpi_device_bus_id->bus_id,
 469                             acpi_device_hid(device))) {
 470                         acpi_device_bus_id->instance_no++;
 471                         found = 1;
 472                         kfree(new_bus_id);
 473                         break;
 474                 }
 475         }
 476         if (!found) {
 477                 acpi_device_bus_id = new_bus_id;
 478                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 479                 acpi_device_bus_id->instance_no = 0;
 480                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 481         }
 482         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 483
 484         if (device->parent)
 485                 list_add_tail(&device->node, &device->parent->children);
 486
 487         if (device->wakeup.flags.valid)
 488                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 489         mutex_unlock(&acpi_device_lock);
 490
 491         if (device->parent)
 492                 device->dev.parent = &device->parent->dev;
 493         device->dev.bus = &acpi_bus_type;
 494         device->dev.release = &acpi_device_release;
 495         result = device_register(&device->dev);
 496         if (result) {
 497                 dev_err(&device->dev, "Error registering device\n");
 498                 goto end;
 499         }
 500
 501         result = acpi_device_setup_files(device);
 502         if (result)
 503                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 504                        dev_name(&device->dev));
 505
 506         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 507         return 0;
 508 end:
 509         mutex_lock(&acpi_device_lock);
 510         if (device->parent)
 511                 list_del(&device->node);
 512         list_del(&device->wakeup_list);
 513         mutex_unlock(&acpi_device_lock);
 514         return result;
 515 }
 516
 517 static void acpi_device_unregister(struct acpi_device *device, int type)
 518 {
 519         mutex_lock(&acpi_device_lock);
 520         if (device->parent)
 521                 list_del(&device->node);
 522
 523         list_del(&device->wakeup_list);
 524         mutex_unlock(&acpi_device_lock);
 525
 526         acpi_detach_data(device->handle, acpi_bus_data_handler);
 527
 528         acpi_device_remove_files(device);
 529         device_unregister(&device->dev);
 530 }
 531
 532 /* --------------------------------------------------------------------------
 533                                  Driver Management
 534    -------------------------------------------------------------------------- */
 535 /**
 536  * acpi_bus_driver_init - add a device to a driver
 537  * @device: the device to add and initialize
 538  * @driver: driver for the device
 539  *
 540  * Used to initialize a device via its device driver.  Called whenever a
 541  * driver is bound to a device.  Invokes the driver's add() ops.
 542  */
 543 static int
 544 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 545 {
 546         int result = 0;
 547
 548         if (!device || !driver)
 549                 return -EINVAL;
 550
 551         if (!driver->ops.add)
 552                 return -ENOSYS;
 553
 554         result = driver->ops.add(device);
 555         if (result) {
 556                 device->driver = NULL;
 557                 device->driver_data = NULL;
 558                 return result;
 559         }
 560
 561         device->driver = driver;
 562
 563         /*
 564          * TBD - Configuration Management: Assign resources to device based
 565          * upon possible configuration and currently allocated resources.
 566          */
 567
 568         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 569                           "Driver successfully bound to device\n"));
 570         return 0;
 571 }
 572
 573 static int acpi_start_single_object(struct acpi_device *device)
 574 {
 575         int result = 0;
 576         struct acpi_driver *driver;
 577
 578
 579         if (!(driver = device->driver))
 580                 return 0;
 581
 582         if (driver->ops.start) {
 583                 result = driver->ops.start(device);
 584                 if (result && driver->ops.remove)
 585                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 586         }
 587
 588         return result;
 589 }
 590
 591 /**
 592  * acpi_bus_register_driver - register a driver with the ACPI bus
 593  * @driver: driver being registered
 594  *
 595  * Registers a driver with the ACPI bus.  Searches the namespace for all
 596  * devices that match the driver's criteria and binds.  Returns zero for
 597  * success or a negative error status for failure.
 598  */
 599 int acpi_bus_register_driver(struct acpi_driver *driver)
 600 {
 601         int ret;
 602
 603         if (acpi_disabled)
 604                 return -ENODEV;
 605         driver->drv.name = driver->name;
 606         driver->drv.bus = &acpi_bus_type;
 607         driver->drv.owner = driver->owner;
 608
 609         ret = driver_register(&driver->drv);
 610         return ret;
 611 }
 612
 613 EXPORT_SYMBOL(acpi_bus_register_driver);
 614
 615 /**
 616  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 617  * @driver: driver to unregister
 618  *
 619  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 620  * devices that match the driver's criteria and unbinds.
 621  */
 622 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 623 {
 624         driver_unregister(&driver->drv);
 625 }
 626
 627 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 628
 629 /* --------------------------------------------------------------------------
 630                                  Device Enumeration
 631    -------------------------------------------------------------------------- */
 632 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 633 {
 634         acpi_status status;
 635         int ret;
 636         struct acpi_device *device;
 637
 638         /*
 639          * Fixed hardware devices do not appear in the namespace and do not
 640          * have handles, but we fabricate acpi_devices for them, so we have
 641          * to deal with them specially.
 642          */
 643         if (handle == NULL)
 644                 return acpi_root;
 645
 646         do {
 647                 status = acpi_get_parent(handle, &handle);
 648                 if (status == AE_NULL_ENTRY)
 649                         return NULL;
 650                 if (ACPI_FAILURE(status))
 651                         return acpi_root;
 652
 653                 ret = acpi_bus_get_device(handle, &device);
 654                 if (ret == 0)
 655                         return device;
 656         } while (1);
 657 }
 658
 659 acpi_status
 660 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 661 {
 662         acpi_status status;
 663         acpi_handle tmp;
 664         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 665         union acpi_object *obj;
 666
 667         status = acpi_get_handle(handle, "_EJD", &tmp);
 668         if (ACPI_FAILURE(status))
 669                 return status;
 670
 671         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 672         if (ACPI_SUCCESS(status)) {
 673                 obj = buffer.pointer;
 674                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 675                                          ejd);
 676                 kfree(buffer.pointer);
 677         }
 678         return status;
 679 }
 680 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 681
 682 void acpi_bus_data_handler(acpi_handle handle, void *context)
 683 {
 684
 685         /* TBD */
 686
 687         return;
 688 }
 689
 690 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 691 {
 692         device->performance.state = ACPI_STATE_UNKNOWN;
 693         return 0;
 694 }
 695
 696 static acpi_status
 697 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 698                                              union acpi_object *package)
 699 {
 700         int i = 0;
 701         union acpi_object *element = NULL;
 702
 703         if (!device || !package || (package->package.count < 2))
 704                 return AE_BAD_PARAMETER;
 705
 706         element = &(package->package.elements[0]);
 707         if (!element)
 708                 return AE_BAD_PARAMETER;
 709         if (element->type == ACPI_TYPE_PACKAGE) {
 710                 if ((element->package.count < 2) ||
 711                     (element->package.elements[0].type !=
 712                      ACPI_TYPE_LOCAL_REFERENCE)
 713                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 714                         return AE_BAD_DATA;
 715                 device->wakeup.gpe_device =
 716                     element->package.elements[0].reference.handle;
 717                 device->wakeup.gpe_number =
 718                     (u32) element->package.elements[1].integer.value;
 719         } else if (element->type == ACPI_TYPE_INTEGER) {
 720                 device->wakeup.gpe_number = element->integer.value;
 721         } else
 722                 return AE_BAD_DATA;
 723
 724         element = &(package->package.elements[1]);
 725         if (element->type != ACPI_TYPE_INTEGER) {
 726                 return AE_BAD_DATA;
 727         }
 728         device->wakeup.sleep_state = element->integer.value;
 729
 730         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 731                 return AE_NO_MEMORY;
 732         }
 733         device->wakeup.resources.count = package->package.count - 2;
 734         for (i = 0; i < device->wakeup.resources.count; i++) {
 735                 element = &(package->package.elements[i + 2]);
 736                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 737                         return AE_BAD_DATA;
 738
 739                 device->wakeup.resources.handles[i] = element->reference.handle;
 740         }
 741
 742         return AE_OK;
 743 }
 744
 745 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
 746 {
 747         struct acpi_device_id button_device_ids[] = {
 748                 {"PNP0C0D", 0},
 749                 {"PNP0C0C", 0},
 750                 {"PNP0C0E", 0},
 751                 {"", 0},
 752         };
 753         acpi_status status;
 754         acpi_event_status event_status;
 755
 756         device->wakeup.run_wake_count = 0;
 757         device->wakeup.flags.notifier_present = 0;
 758
 759         /* Power button, Lid switch always enable wakeup */
 760         if (!acpi_match_device_ids(device, button_device_ids)) {
 761                 device->wakeup.flags.run_wake = 1;
 762                 device->wakeup.flags.always_enabled = 1;
 763                 return;
 764         }
 765
 766         status = acpi_get_gpe_status(NULL, device->wakeup.gpe_number,
 767                                         ACPI_NOT_ISR, &event_status);
 768         if (status == AE_OK)
 769                 device->wakeup.flags.run_wake =
 770                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
 771 }
 772
 773 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 774 {
 775         acpi_status status = 0;
 776         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 777         union acpi_object *package = NULL;
 778         int psw_error;
 779
 780         /* _PRW */
 781         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 782         if (ACPI_FAILURE(status)) {
 783                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 784                 goto end;
 785         }
 786
 787         package = (union acpi_object *)buffer.pointer;
 788         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 789         if (ACPI_FAILURE(status)) {
 790                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 791                 goto end;
 792         }
 793
 794         kfree(buffer.pointer);
 795
 796         device->wakeup.flags.valid = 1;
 797         device->wakeup.prepare_count = 0;
 798         acpi_bus_set_run_wake_flags(device);
 799         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 800          * system for the ACPI device with the _PRW object.
 801          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 802          * So it is necessary to call _DSW object first. Only when it is not
 803          * present will the _PSW object used.
 804          */
 805         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 806         if (psw_error)
 807                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 808                                 "error in _DSW or _PSW evaluation\n"));
 809
 810 end:
 811         if (ACPI_FAILURE(status))
 812                 device->flags.wake_capable = 0;
 813         return 0;
 814 }
 815
 816 static int acpi_bus_get_power_flags(struct acpi_device *device)
 817 {
 818         acpi_status status = 0;
 819         acpi_handle handle = NULL;
 820         u32 i = 0;
 821
 822
 823         /*
 824          * Power Management Flags
 825          */
 826         status = acpi_get_handle(device->handle, "_PSC", &handle);
 827         if (ACPI_SUCCESS(status))
 828                 device->power.flags.explicit_get = 1;
 829         status = acpi_get_handle(device->handle, "_IRC", &handle);
 830         if (ACPI_SUCCESS(status))
 831                 device->power.flags.inrush_current = 1;
 832
 833         /*
 834          * Enumerate supported power management states
 835          */
 836         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 837                 struct acpi_device_power_state *ps = &device->power.states[i];
 838                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 839
 840                 /* Evaluate "_PRx" to se if power resources are referenced */
 841                 acpi_evaluate_reference(device->handle, object_name, NULL,
 842                                         &ps->resources);
 843                 if (ps->resources.count) {
 844                         device->power.flags.power_resources = 1;
 845                         ps->flags.valid = 1;
 846                 }
 847
 848                 /* Evaluate "_PSx" to see if we can do explicit sets */
 849                 object_name[2] = 'S';
 850                 status = acpi_get_handle(device->handle, object_name, &handle);
 851                 if (ACPI_SUCCESS(status)) {
 852                         ps->flags.explicit_set = 1;
 853                         ps->flags.valid = 1;
 854                 }
 855
 856                 /* State is valid if we have some power control */
 857                 if (ps->resources.count || ps->flags.explicit_set)
 858                         ps->flags.valid = 1;
 859
 860                 ps->power = -1; /* Unknown - driver assigned */
 861                 ps->latency = -1;       /* Unknown - driver assigned */
 862         }
 863
 864         /* Set defaults for D0 and D3 states (always valid) */
 865         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 866         device->power.states[ACPI_STATE_D0].power = 100;
 867         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 868         device->power.states[ACPI_STATE_D3].power = 0;
 869
 870         /* TBD: System wake support and resource requirements. */
 871
 872         device->power.state = ACPI_STATE_UNKNOWN;
 873         acpi_bus_get_power(device->handle, &(device->power.state));
 874
 875         return 0;
 876 }
 877
 878 static int acpi_bus_get_flags(struct acpi_device *device)
 879 {
 880         acpi_status status = AE_OK;
 881         acpi_handle temp = NULL;
 882
 883
 884         /* Presence of _STA indicates 'dynamic_status' */
 885         status = acpi_get_handle(device->handle, "_STA", &temp);
 886         if (ACPI_SUCCESS(status))
 887                 device->flags.dynamic_status = 1;
 888
 889         /* Presence of _RMV indicates 'removable' */
 890         status = acpi_get_handle(device->handle, "_RMV", &temp);
 891         if (ACPI_SUCCESS(status))
 892                 device->flags.removable = 1;
 893
 894         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 895         status = acpi_get_handle(device->handle, "_EJD", &temp);
 896         if (ACPI_SUCCESS(status))
 897                 device->flags.ejectable = 1;
 898         else {
 899                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 900                 if (ACPI_SUCCESS(status))
 901                         device->flags.ejectable = 1;
 902         }
 903
 904         /* Presence of _LCK indicates 'lockable' */
 905         status = acpi_get_handle(device->handle, "_LCK", &temp);
 906         if (ACPI_SUCCESS(status))
 907                 device->flags.lockable = 1;
 908
 909         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 910         status = acpi_get_handle(device->handle, "_PS0", &temp);
 911         if (ACPI_FAILURE(status))
 912                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 913         if (ACPI_SUCCESS(status))
 914                 device->flags.power_manageable = 1;
 915
 916         /* Presence of _PRW indicates wake capable */
 917         status = acpi_get_handle(device->handle, "_PRW", &temp);
 918         if (ACPI_SUCCESS(status))
 919                 device->flags.wake_capable = 1;
 920
 921         /* TBD: Performance management */
 922
 923         return 0;
 924 }
 925
 926 static void acpi_device_get_busid(struct acpi_device *device)
 927 {
 928         char bus_id[5] = { '?', 0 };
 929         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 930         int i = 0;
 931
 932         /*
 933          * Bus ID
 934          * ------
 935          * The device's Bus ID is simply the object name.
 936          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 937          */
 938         if (ACPI_IS_ROOT_DEVICE(device)) {
 939                 strcpy(device->pnp.bus_id, "ACPI");
 940                 return;
 941         }
 942
 943         switch (device->device_type) {
 944         case ACPI_BUS_TYPE_POWER_BUTTON:
 945                 strcpy(device->pnp.bus_id, "PWRF");
 946                 break;
 947         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 948                 strcpy(device->pnp.bus_id, "SLPF");
 949                 break;
 950         default:
 951                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
 952                 /* Clean up trailing underscores (if any) */
 953                 for (i = 3; i > 1; i--) {
 954                         if (bus_id[i] == '_')
 955                                 bus_id[i] = '\0';
 956                         else
 957                                 break;
 958                 }
 959                 strcpy(device->pnp.bus_id, bus_id);
 960                 break;
 961         }
 962 }
 963
 964 /*
 965  * acpi_bay_match - see if a device is an ejectable driver bay
 966  *
 967  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 968  * then we can safely call it an ejectable drive bay
 969  */
 970 static int acpi_bay_match(struct acpi_device *device){
 971         acpi_status status;
 972         acpi_handle handle;
 973         acpi_handle tmp;
 974         acpi_handle phandle;
 975
 976         handle = device->handle;
 977
 978         status = acpi_get_handle(handle, "_EJ0", &tmp);
 979         if (ACPI_FAILURE(status))
 980                 return -ENODEV;
 981
 982         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 983                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 984                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 985                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 986                 return 0;
 987
 988         if (acpi_get_parent(handle, &phandle))
 989                 return -ENODEV;
 990
 991         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 992                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 993                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 994                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 995                 return 0;
 996
 997         return -ENODEV;
 998 }
 999
1000 /*
1001  * acpi_dock_match - see if a device has a _DCK method
1002  */
1003 static int acpi_dock_match(struct acpi_device *device)
1004 {
1005         acpi_handle tmp;
1006         return acpi_get_handle(device->handle, "_DCK", &tmp);
1007 }
1008
1009 char *acpi_device_hid(struct acpi_device *device)
1010 {
1011         struct acpi_hardware_id *hid;
1012
1013         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1014         return hid->id;
1015 }
1016 EXPORT_SYMBOL(acpi_device_hid);
1017
1018 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1019 {
1020         struct acpi_hardware_id *id;
1021
1022         id = kmalloc(sizeof(*id), GFP_KERNEL);
1023         if (!id)
1024                 return;
1025
1026         id->id = kmalloc(strlen(dev_id) + 1, GFP_KERNEL);
1027         if (!id->id) {
1028                 kfree(id);
1029                 return;
1030         }
1031
1032         strcpy(id->id, dev_id);
1033         list_add_tail(&id->list, &device->pnp.ids);
1034 }
1035
1036 /*
1037  * Old IBM workstations have a DSDT bug wherein the SMBus object
1038  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1039  * prefix.  Work around this.
1040  */
1041 static int acpi_ibm_smbus_match(struct acpi_device *device)
1042 {
1043         acpi_handle h_dummy;
1044         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1045         int result;
1046
1047         if (!dmi_name_in_vendors("IBM"))
1048                 return -ENODEV;
1049
1050         /* Look for SMBS object */
1051         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1052         if (result)
1053                 return result;
1054
1055         if (strcmp("SMBS", path.pointer)) {
1056                 result = -ENODEV;
1057                 goto out;
1058         }
1059
1060         /* Does it have the necessary (but misnamed) methods? */
1061         result = -ENODEV;
1062         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1063             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1064             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1065                 result = 0;
1066 out:
1067         kfree(path.pointer);
1068         return result;
1069 }
1070
1071 static void acpi_device_set_id(struct acpi_device *device)
1072 {
1073         acpi_status status;
1074         struct acpi_device_info *info;
1075         struct acpica_device_id_list *cid_list;
1076         int i;
1077
1078         switch (device->device_type) {
1079         case ACPI_BUS_TYPE_DEVICE:
1080                 if (ACPI_IS_ROOT_DEVICE(device)) {
1081                         acpi_add_id(device, ACPI_SYSTEM_HID);
1082                         break;
1083                 } else if (ACPI_IS_ROOT_DEVICE(device->parent)) {
1084                         /* \_SB_, the only root-level namespace device */
1085                         acpi_add_id(device, ACPI_BUS_HID);
1086                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1087                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1088                         break;
1089                 }
1090
1091                 status = acpi_get_object_info(device->handle, &info);
1092                 if (ACPI_FAILURE(status)) {
1093                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1094                         return;
1095                 }
1096
1097                 if (info->valid & ACPI_VALID_HID)
1098                         acpi_add_id(device, info->hardware_id.string);
1099                 if (info->valid & ACPI_VALID_CID) {
1100                         cid_list = &info->compatible_id_list;
1101                         for (i = 0; i < cid_list->count; i++)
1102                                 acpi_add_id(device, cid_list->ids[i].string);
1103                 }
1104                 if (info->valid & ACPI_VALID_ADR) {
1105                         device->pnp.bus_address = info->address;
1106                         device->flags.bus_address = 1;
1107                 }
1108
1109                 kfree(info);
1110
1111                 /*
1112                  * Some devices don't reliably have _HIDs & _CIDs, so add
1113                  * synthetic HIDs to make sure drivers can find them.
1114                  */
1115                 if (acpi_is_video_device(device))
1116                         acpi_add_id(device, ACPI_VIDEO_HID);
1117                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1118                         acpi_add_id(device, ACPI_BAY_HID);
1119                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1120                         acpi_add_id(device, ACPI_DOCK_HID);
1121                 else if (!acpi_ibm_smbus_match(device))
1122                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1123
1124                 break;
1125         case ACPI_BUS_TYPE_POWER:
1126                 acpi_add_id(device, ACPI_POWER_HID);
1127                 break;
1128         case ACPI_BUS_TYPE_PROCESSOR:
1129                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1130                 break;
1131         case ACPI_BUS_TYPE_THERMAL:
1132                 acpi_add_id(device, ACPI_THERMAL_HID);
1133                 break;
1134         case ACPI_BUS_TYPE_POWER_BUTTON:
1135                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1136                 break;
1137         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1138                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1139                 break;
1140         }
1141
1142         /*
1143          * We build acpi_devices for some objects that don't have _HID or _CID,
1144          * e.g., PCI bridges and slots.  Drivers can't bind to these objects,
1145          * but we do use them indirectly by traversing the acpi_device tree.
1146          * This generic ID isn't useful for driver binding, but it provides
1147          * the useful property that "every acpi_device has an ID."
1148          */
1149         if (list_empty(&device->pnp.ids))
1150                 acpi_add_id(device, "device");
1151 }
1152
1153 static int acpi_device_set_context(struct acpi_device *device)
1154 {
1155         acpi_status status;
1156
1157         /*
1158          * Context
1159          * -------
1160          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1161          * resolutions from handle->device very efficient.  Fixed hardware
1162          * devices have no handles, so we skip them.
1163          */
1164         if (!device->handle)
1165                 return 0;
1166
1167         status = acpi_attach_data(device->handle,
1168                                   acpi_bus_data_handler, device);
1169         if (ACPI_SUCCESS(status))
1170                 return 0;
1171
1172         printk(KERN_ERR PREFIX "Error attaching device data\n");
1173         return -ENODEV;
1174 }
1175
1176 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1177 {
1178         if (!dev)
1179                 return -EINVAL;
1180
1181         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1182         device_release_driver(&dev->dev);
1183
1184         if (!rmdevice)
1185                 return 0;
1186
1187         /*
1188          * unbind _ADR-Based Devices when hot removal
1189          */
1190         if (dev->flags.bus_address) {
1191                 if ((dev->parent) && (dev->parent->ops.unbind))
1192                         dev->parent->ops.unbind(dev);
1193         }
1194         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1195
1196         return 0;
1197 }
1198
1199 static int acpi_add_single_object(struct acpi_device **child,
1200                                   acpi_handle handle, int type,
1201                                   unsigned long long sta,
1202                                   struct acpi_bus_ops *ops)
1203 {
1204         int result;
1205         struct acpi_device *device;
1206         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1207
1208         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1209         if (!device) {
1210                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1211                 return -ENOMEM;
1212         }
1213
1214         INIT_LIST_HEAD(&device->pnp.ids);
1215         device->device_type = type;
1216         device->handle = handle;
1217         device->parent = acpi_bus_get_parent(handle);
1218         device->bus_ops = *ops; /* workround for not call .start */
1219         STRUCT_TO_INT(device->status) = sta;
1220
1221         acpi_device_get_busid(device);
1222
1223         /*
1224          * Flags
1225          * -----
1226          * Note that we only look for object handles -- cannot evaluate objects
1227          * until we know the device is present and properly initialized.
1228          */
1229         result = acpi_bus_get_flags(device);
1230         if (result)
1231                 goto end;
1232
1233         /*
1234          * Initialize Device
1235          * -----------------
1236          * TBD: Synch with Core's enumeration/initialization process.
1237          */
1238         acpi_device_set_id(device);
1239
1240         /*
1241          * Power Management
1242          * ----------------
1243          */
1244         if (device->flags.power_manageable) {
1245                 result = acpi_bus_get_power_flags(device);
1246                 if (result)
1247                         goto end;
1248         }
1249
1250         /*
1251          * Wakeup device management
1252          *-----------------------
1253          */
1254         if (device->flags.wake_capable) {
1255                 result = acpi_bus_get_wakeup_device_flags(device);
1256                 if (result)
1257                         goto end;
1258         }
1259
1260         /*
1261          * Performance Management
1262          * ----------------------
1263          */
1264         if (device->flags.performance_manageable) {
1265                 result = acpi_bus_get_perf_flags(device);
1266                 if (result)
1267                         goto end;
1268         }
1269
1270         if ((result = acpi_device_set_context(device)))
1271                 goto end;
1272
1273         result = acpi_device_register(device);
1274
1275         /*
1276          * Bind _ADR-Based Devices when hot add
1277          */
1278         if (device->flags.bus_address) {
1279                 if (device->parent && device->parent->ops.bind)
1280                         device->parent->ops.bind(device);
1281         }
1282
1283 end:
1284         if (!result) {
1285                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1286                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1287                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1288                          (char *) buffer.pointer,
1289                          device->parent ? dev_name(&device->parent->dev) :
1290                                           "(null)"));
1291                 kfree(buffer.pointer);
1292                 *child = device;
1293         } else
1294                 acpi_device_release(&device->dev);
1295
1296         return result;
1297 }
1298
1299 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1300                           ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
1301
1302 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1303                                     unsigned long long *sta)
1304 {
1305         acpi_status status;
1306         acpi_object_type acpi_type;
1307
1308         status = acpi_get_type(handle, &acpi_type);
1309         if (ACPI_FAILURE(status))
1310                 return -ENODEV;
1311
1312         switch (acpi_type) {
1313         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1314         case ACPI_TYPE_DEVICE:
1315                 *type = ACPI_BUS_TYPE_DEVICE;
1316                 status = acpi_bus_get_status_handle(handle, sta);
1317                 if (ACPI_FAILURE(status))
1318                         return -ENODEV;
1319                 break;
1320         case ACPI_TYPE_PROCESSOR:
1321                 *type = ACPI_BUS_TYPE_PROCESSOR;
1322                 status = acpi_bus_get_status_handle(handle, sta);
1323                 if (ACPI_FAILURE(status))
1324                         return -ENODEV;
1325                 break;
1326         case ACPI_TYPE_THERMAL:
1327                 *type = ACPI_BUS_TYPE_THERMAL;
1328                 *sta = ACPI_STA_DEFAULT;
1329                 break;
1330         case ACPI_TYPE_POWER:
1331                 *type = ACPI_BUS_TYPE_POWER;
1332                 *sta = ACPI_STA_DEFAULT;
1333                 break;
1334         default:
1335                 return -ENODEV;
1336         }
1337
1338         return 0;
1339 }
1340
1341 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1342                                       void *context, void **return_value)
1343 {
1344         struct acpi_bus_ops *ops = context;
1345         int type;
1346         unsigned long long sta;
1347         struct acpi_device *device;
1348         acpi_status status;
1349         int result;
1350
1351         result = acpi_bus_type_and_status(handle, &type, &sta);
1352         if (result)
1353                 return AE_OK;
1354
1355         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1356             !(sta & ACPI_STA_DEVICE_FUNCTIONING))
1357                 return AE_CTRL_DEPTH;
1358
1359         /*
1360          * We may already have an acpi_device from a previous enumeration.  If
1361          * so, we needn't add it again, but we may still have to start it.
1362          */
1363         device = NULL;
1364         acpi_bus_get_device(handle, &device);
1365         if (ops->acpi_op_add && !device)
1366                 acpi_add_single_object(&device, handle, type, sta, ops);
1367
1368         if (!device)
1369                 return AE_CTRL_DEPTH;
1370
1371         if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1372                 status = acpi_start_single_object(device);
1373                 if (ACPI_FAILURE(status))
1374                         return AE_CTRL_DEPTH;
1375         }
1376
1377         if (!*return_value)
1378                 *return_value = device;
1379         return AE_OK;
1380 }
1381
1382 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1383                          struct acpi_device **child)
1384 {
1385         acpi_status status;
1386         void *device = NULL;
1387
1388         status = acpi_bus_check_add(handle, 0, ops, &device);
1389         if (ACPI_SUCCESS(status))
1390                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1391                                     acpi_bus_check_add, NULL, ops, &device);
1392
1393         if (child)
1394                 *child = device;
1395
1396         if (device)
1397                 return 0;
1398         else
1399                 return -ENODEV;
1400 }
1401
1402 /*
1403  * acpi_bus_add and acpi_bus_start
1404  *
1405  * scan a given ACPI tree and (probably recently hot-plugged)
1406  * create and add or starts found devices.
1407  *
1408  * If no devices were found -ENODEV is returned which does not
1409  * mean that this is a real error, there just have been no suitable
1410  * ACPI objects in the table trunk from which the kernel could create
1411  * a device and add/start an appropriate driver.
1412  */
1413
1414 int
1415 acpi_bus_add(struct acpi_device **child,
1416              struct acpi_device *parent, acpi_handle handle, int type)
1417 {
1418         struct acpi_bus_ops ops;
1419
1420         memset(&ops, 0, sizeof(ops));
1421         ops.acpi_op_add = 1;
1422
1423         return acpi_bus_scan(handle, &ops, child);
1424 }
1425 EXPORT_SYMBOL(acpi_bus_add);
1426
1427 int acpi_bus_start(struct acpi_device *device)
1428 {
1429         struct acpi_bus_ops ops;
1430
1431         if (!device)
1432                 return -EINVAL;
1433
1434         memset(&ops, 0, sizeof(ops));
1435         ops.acpi_op_start = 1;
1436
1437         return acpi_bus_scan(device->handle, &ops, NULL);
1438 }
1439 EXPORT_SYMBOL(acpi_bus_start);
1440
1441 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1442 {
1443         acpi_status status;
1444         struct acpi_device *parent, *child;
1445         acpi_handle phandle, chandle;
1446         acpi_object_type type;
1447         u32 level = 1;
1448         int err = 0;
1449
1450         parent = start;
1451         phandle = start->handle;
1452         child = chandle = NULL;
1453
1454         while ((level > 0) && parent && (!err)) {
1455                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1456                                               chandle, &chandle);
1457
1458                 /*
1459                  * If this scope is exhausted then move our way back up.
1460                  */
1461                 if (ACPI_FAILURE(status)) {
1462                         level--;
1463                         chandle = phandle;
1464                         acpi_get_parent(phandle, &phandle);
1465                         child = parent;
1466                         parent = parent->parent;
1467
1468                         if (level == 0)
1469                                 err = acpi_bus_remove(child, rmdevice);
1470                         else
1471                                 err = acpi_bus_remove(child, 1);
1472
1473                         continue;
1474                 }
1475
1476                 status = acpi_get_type(chandle, &type);
1477                 if (ACPI_FAILURE(status)) {
1478                         continue;
1479                 }
1480                 /*
1481                  * If there is a device corresponding to chandle then
1482                  * parse it (depth-first).
1483                  */
1484                 if (acpi_bus_get_device(chandle, &child) == 0) {
1485                         level++;
1486                         phandle = chandle;
1487                         chandle = NULL;
1488                         parent = child;
1489                 }
1490                 continue;
1491         }
1492         return err;
1493 }
1494 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1495
1496 static int acpi_bus_scan_fixed(void)
1497 {
1498         int result = 0;
1499         struct acpi_device *device = NULL;
1500         struct acpi_bus_ops ops;
1501
1502         memset(&ops, 0, sizeof(ops));
1503         ops.acpi_op_add = 1;
1504         ops.acpi_op_start = 1;
1505
1506         /*
1507          * Enumerate all fixed-feature devices.
1508          */
1509         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1510                 result = acpi_add_single_object(&device, NULL,
1511                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1512                                                 ACPI_STA_DEFAULT,
1513                                                 &ops);
1514         }
1515
1516         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1517                 result = acpi_add_single_object(&device, NULL,
1518                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1519                                                 ACPI_STA_DEFAULT,
1520                                                 &ops);
1521         }
1522
1523         return result;
1524 }
1525
1526 int __init acpi_scan_init(void)
1527 {
1528         int result;
1529         struct acpi_bus_ops ops;
1530
1531         memset(&ops, 0, sizeof(ops));
1532         ops.acpi_op_add = 1;
1533         ops.acpi_op_start = 1;
1534
1535         result = bus_register(&acpi_bus_type);
1536         if (result) {
1537                 /* We don't want to quit even if we failed to add suspend/resume */
1538                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1539         }
1540
1541         /*
1542          * Enumerate devices in the ACPI namespace.
1543          */
1544         result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1545
1546         if (!result)
1547                 result = acpi_bus_scan_fixed();
1548
1549         if (result)
1550                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1551
1552         return result;
1553 }