drivers/acpi/scan.c

   1 /*
   2  * scan.c - support for transforming the ACPI namespace into individual objects
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/init.h>
   7 #include <linux/kernel.h>
   8 #include <linux/acpi.h>
   9 #include <linux/signal.h>
  10 #include <linux/kthread.h>
  11
  12 #include <acpi/acpi_drivers.h>
  13 #include <acpi/acinterp.h>      /* for acpi_ex_eisa_id_to_string() */
  14
  15 #define _COMPONENT              ACPI_BUS_COMPONENT
  16 ACPI_MODULE_NAME("scan");
  17 #define STRUCT_TO_INT(s)        (*((int*)&s))
  18 extern struct acpi_device *acpi_root;
  19
  20 #define ACPI_BUS_CLASS                  "system_bus"
  21 #define ACPI_BUS_HID                    "LNXSYBUS"
  22 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  23
  24 static LIST_HEAD(acpi_device_list);
  25 static LIST_HEAD(acpi_bus_id_list);
  26 DEFINE_SPINLOCK(acpi_device_lock);
  27 LIST_HEAD(acpi_wakeup_device_list);
  28
  29 struct acpi_device_bus_id{
  30         char bus_id[15];
  31         unsigned int instance_no;
  32         struct list_head node;
  33 };
  34
  35 /*
  36  * Creates hid/cid(s) string needed for modalias and uevent
  37  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  38  * char *modalias: "acpi:IBM0001:ACPI0001"
  39 */
  40 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  41                            int size)
  42 {
  43         int len;
  44         int count;
  45
  46         if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
  47                 return -ENODEV;
  48
  49         len = snprintf(modalias, size, "acpi:");
  50         size -= len;
  51
  52         if (acpi_dev->flags.hardware_id) {
  53                 count = snprintf(&modalias[len], size, "%s:",
  54                                  acpi_dev->pnp.hardware_id);
  55                 if (count < 0 || count >= size)
  56                         return -EINVAL;
  57                 len += count;
  58                 size -= count;
  59         }
  60
  61         if (acpi_dev->flags.compatible_ids) {
  62                 struct acpi_compatible_id_list *cid_list;
  63                 int i;
  64
  65                 cid_list = acpi_dev->pnp.cid_list;
  66                 for (i = 0; i < cid_list->count; i++) {
  67                         count = snprintf(&modalias[len], size, "%s:",
  68                                          cid_list->id[i].value);
  69                         if (count < 0 || count >= size) {
  70                                 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
  71                                        acpi_dev->pnp.device_name, i);
  72                                 break;
  73                         }
  74                         len += count;
  75                         size -= count;
  76                 }
  77         }
  78
  79         modalias[len] = '\0';
  80         return len;
  81 }
  82
  83 static ssize_t
  84 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  85         struct acpi_device *acpi_dev = to_acpi_device(dev);
  86         int len;
  87
  88         /* Device has no HID and no CID or string is >1024 */
  89         len = create_modalias(acpi_dev, buf, 1024);
  90         if (len <= 0)
  91                 return 0;
  92         buf[len++] = '\n';
  93         return len;
  94 }
  95 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  96
  97 static int acpi_bus_hot_remove_device(void *context)
  98 {
  99         struct acpi_device *device;
 100         acpi_handle handle = context;
 101         struct acpi_object_list arg_list;
 102         union acpi_object arg;
 103         acpi_status status = AE_OK;
 104
 105         if (acpi_bus_get_device(handle, &device))
 106                 return 0;
 107
 108         if (!device)
 109                 return 0;
 110
 111         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 112                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 113
 114         if (acpi_bus_trim(device, 1)) {
 115                 printk(KERN_ERR PREFIX
 116                                 "Removing device failed\n");
 117                 return -1;
 118         }
 119
 120         /* power off device */
 121         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 122         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 123                 printk(KERN_WARNING PREFIX
 124                                 "Power-off device failed\n");
 125
 126         if (device->flags.lockable) {
 127                 arg_list.count = 1;
 128                 arg_list.pointer = &arg;
 129                 arg.type = ACPI_TYPE_INTEGER;
 130                 arg.integer.value = 0;
 131                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 132         }
 133
 134         arg_list.count = 1;
 135         arg_list.pointer = &arg;
 136         arg.type = ACPI_TYPE_INTEGER;
 137         arg.integer.value = 1;
 138
 139         /*
 140          * TBD: _EJD support.
 141          */
 142         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 143         if (ACPI_FAILURE(status))
 144                 return -ENODEV;
 145
 146         return 0;
 147 }
 148
 149 static ssize_t
 150 acpi_eject_store(struct device *d, struct device_attribute *attr,
 151                 const char *buf, size_t count)
 152 {
 153         int ret = count;
 154         acpi_status status;
 155         acpi_object_type type = 0;
 156         struct acpi_device *acpi_device = to_acpi_device(d);
 157         struct task_struct *task;
 158
 159         if ((!count) || (buf[0] != '1')) {
 160                 return -EINVAL;
 161         }
 162 #ifndef FORCE_EJECT
 163         if (acpi_device->driver == NULL) {
 164                 ret = -ENODEV;
 165                 goto err;
 166         }
 167 #endif
 168         status = acpi_get_type(acpi_device->handle, &type);
 169         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 170                 ret = -ENODEV;
 171                 goto err;
 172         }
 173
 174         /* remove the device in another thread to fix the deadlock issue */
 175         task = kthread_run(acpi_bus_hot_remove_device,
 176                                 acpi_device->handle, "acpi_hot_remove_device");
 177         if (IS_ERR(task))
 178                 ret = PTR_ERR(task);
 179 err:
 180         return ret;
 181 }
 182
 183 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 184
 185 static ssize_t
 186 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 187         struct acpi_device *acpi_dev = to_acpi_device(dev);
 188
 189         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
 190 }
 191 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 192
 193 static ssize_t
 194 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 195         struct acpi_device *acpi_dev = to_acpi_device(dev);
 196         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 197         int result;
 198
 199         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 200         if(result)
 201                 goto end;
 202
 203         result = sprintf(buf, "%s\n", (char*)path.pointer);
 204         kfree(path.pointer);
 205   end:
 206         return result;
 207 }
 208 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 209
 210 static int acpi_device_setup_files(struct acpi_device *dev)
 211 {
 212         acpi_status status;
 213         acpi_handle temp;
 214         int result = 0;
 215
 216         /*
 217          * Devices gotten from FADT don't have a "path" attribute
 218          */
 219         if(dev->handle) {
 220                 result = device_create_file(&dev->dev, &dev_attr_path);
 221                 if(result)
 222                         goto end;
 223         }
 224
 225         if(dev->flags.hardware_id) {
 226                 result = device_create_file(&dev->dev, &dev_attr_hid);
 227                 if(result)
 228                         goto end;
 229         }
 230
 231         if (dev->flags.hardware_id || dev->flags.compatible_ids){
 232                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 233                 if(result)
 234                         goto end;
 235         }
 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                 result = device_create_file(&dev->dev, &dev_attr_eject);
 244   end:
 245         return result;
 246 }
 247
 248 static void acpi_device_remove_files(struct acpi_device *dev)
 249 {
 250         acpi_status status;
 251         acpi_handle temp;
 252
 253         /*
 254          * If device has _EJ0, 'eject' file is created that is used to trigger
 255          * hot-removal function from userland.
 256          */
 257         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 258         if (ACPI_SUCCESS(status))
 259                 device_remove_file(&dev->dev, &dev_attr_eject);
 260
 261         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 262                 device_remove_file(&dev->dev, &dev_attr_modalias);
 263
 264         if(dev->flags.hardware_id)
 265                 device_remove_file(&dev->dev, &dev_attr_hid);
 266         if(dev->handle)
 267                 device_remove_file(&dev->dev, &dev_attr_path);
 268 }
 269 /* --------------------------------------------------------------------------
 270                         ACPI Bus operations
 271    -------------------------------------------------------------------------- */
 272
 273 int acpi_match_device_ids(struct acpi_device *device,
 274                           const struct acpi_device_id *ids)
 275 {
 276         const struct acpi_device_id *id;
 277
 278         /*
 279          * If the device is not present, it is unnecessary to load device
 280          * driver for it.
 281          */
 282         if (!device->status.present)
 283                 return -ENODEV;
 284
 285         if (device->flags.hardware_id) {
 286                 for (id = ids; id->id[0]; id++) {
 287                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 288                                 return 0;
 289                 }
 290         }
 291
 292         if (device->flags.compatible_ids) {
 293                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 294                 int i;
 295
 296                 for (id = ids; id->id[0]; id++) {
 297                         /* compare multiple _CID entries against driver ids */
 298                         for (i = 0; i < cid_list->count; i++) {
 299                                 if (!strcmp((char*)id->id,
 300                                             cid_list->id[i].value))
 301                                         return 0;
 302                         }
 303                 }
 304         }
 305
 306         return -ENOENT;
 307 }
 308 EXPORT_SYMBOL(acpi_match_device_ids);
 309
 310 static void acpi_device_release(struct device *dev)
 311 {
 312         struct acpi_device *acpi_dev = to_acpi_device(dev);
 313
 314         kfree(acpi_dev->pnp.cid_list);
 315         kfree(acpi_dev);
 316 }
 317
 318 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 319 {
 320         struct acpi_device *acpi_dev = to_acpi_device(dev);
 321         struct acpi_driver *acpi_drv = acpi_dev->driver;
 322
 323         if (acpi_drv && acpi_drv->ops.suspend)
 324                 return acpi_drv->ops.suspend(acpi_dev, state);
 325         return 0;
 326 }
 327
 328 static int acpi_device_resume(struct device *dev)
 329 {
 330         struct acpi_device *acpi_dev = to_acpi_device(dev);
 331         struct acpi_driver *acpi_drv = acpi_dev->driver;
 332
 333         if (acpi_drv && acpi_drv->ops.resume)
 334                 return acpi_drv->ops.resume(acpi_dev);
 335         return 0;
 336 }
 337
 338 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 339 {
 340         struct acpi_device *acpi_dev = to_acpi_device(dev);
 341         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 342
 343         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 344 }
 345
 346 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 347 {
 348         struct acpi_device *acpi_dev = to_acpi_device(dev);
 349         int len;
 350
 351         if (add_uevent_var(env, "MODALIAS="))
 352                 return -ENOMEM;
 353         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 354                               sizeof(env->buf) - env->buflen);
 355         if (len >= (sizeof(env->buf) - env->buflen))
 356                 return -ENOMEM;
 357         env->buflen += len;
 358         return 0;
 359 }
 360
 361 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 362 static int acpi_start_single_object(struct acpi_device *);
 363 static int acpi_device_probe(struct device * dev)
 364 {
 365         struct acpi_device *acpi_dev = to_acpi_device(dev);
 366         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 367         int ret;
 368
 369         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 370         if (!ret) {
 371                 if (acpi_dev->bus_ops.acpi_op_start)
 372                         acpi_start_single_object(acpi_dev);
 373                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 374                         "Found driver [%s] for device [%s]\n",
 375                         acpi_drv->name, acpi_dev->pnp.bus_id));
 376                 get_device(dev);
 377         }
 378         return ret;
 379 }
 380
 381 static int acpi_device_remove(struct device * dev)
 382 {
 383         struct acpi_device *acpi_dev = to_acpi_device(dev);
 384         struct acpi_driver *acpi_drv = acpi_dev->driver;
 385
 386         if (acpi_drv) {
 387                 if (acpi_drv->ops.stop)
 388                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 389                 if (acpi_drv->ops.remove)
 390                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 391         }
 392         acpi_dev->driver = NULL;
 393         acpi_dev->driver_data = NULL;
 394
 395         put_device(dev);
 396         return 0;
 397 }
 398
 399 static void acpi_device_shutdown(struct device *dev)
 400 {
 401         struct acpi_device *acpi_dev = to_acpi_device(dev);
 402         struct acpi_driver *acpi_drv = acpi_dev->driver;
 403
 404         if (acpi_drv && acpi_drv->ops.shutdown)
 405                 acpi_drv->ops.shutdown(acpi_dev);
 406
 407         return ;
 408 }
 409
 410 struct bus_type acpi_bus_type = {
 411         .name           = "acpi",
 412         .suspend        = acpi_device_suspend,
 413         .resume         = acpi_device_resume,
 414         .shutdown       = acpi_device_shutdown,
 415         .match          = acpi_bus_match,
 416         .probe          = acpi_device_probe,
 417         .remove         = acpi_device_remove,
 418         .uevent         = acpi_device_uevent,
 419 };
 420
 421 static int acpi_device_register(struct acpi_device *device,
 422                                  struct acpi_device *parent)
 423 {
 424         int result;
 425         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 426         int found = 0;
 427         /*
 428          * Linkage
 429          * -------
 430          * Link this device to its parent and siblings.
 431          */
 432         INIT_LIST_HEAD(&device->children);
 433         INIT_LIST_HEAD(&device->node);
 434         INIT_LIST_HEAD(&device->g_list);
 435         INIT_LIST_HEAD(&device->wakeup_list);
 436
 437         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 438         if (!new_bus_id) {
 439                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 440                 return -ENOMEM;
 441         }
 442
 443         spin_lock(&acpi_device_lock);
 444         /*
 445          * Find suitable bus_id and instance number in acpi_bus_id_list
 446          * If failed, create one and link it into acpi_bus_id_list
 447          */
 448         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 449                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 450                         acpi_device_bus_id->instance_no ++;
 451                         found = 1;
 452                         kfree(new_bus_id);
 453                         break;
 454                 }
 455         }
 456         if(!found) {
 457                 acpi_device_bus_id = new_bus_id;
 458                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 459                 acpi_device_bus_id->instance_no = 0;
 460                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 461         }
 462         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 463
 464         if (device->parent) {
 465                 list_add_tail(&device->node, &device->parent->children);
 466                 list_add_tail(&device->g_list, &device->parent->g_list);
 467         } else
 468                 list_add_tail(&device->g_list, &acpi_device_list);
 469         if (device->wakeup.flags.valid)
 470                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 471         spin_unlock(&acpi_device_lock);
 472
 473         if (device->parent)
 474                 device->dev.parent = &parent->dev;
 475         device->dev.bus = &acpi_bus_type;
 476         device_initialize(&device->dev);
 477         device->dev.release = &acpi_device_release;
 478         result = device_add(&device->dev);
 479         if(result) {
 480                 dev_err(&device->dev, "Error adding device\n");
 481                 goto end;
 482         }
 483
 484         result = acpi_device_setup_files(device);
 485         if(result)
 486                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 487                        dev_name(&device->dev));
 488
 489         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 490         return 0;
 491   end:
 492         spin_lock(&acpi_device_lock);
 493         if (device->parent) {
 494                 list_del(&device->node);
 495                 list_del(&device->g_list);
 496         } else
 497                 list_del(&device->g_list);
 498         list_del(&device->wakeup_list);
 499         spin_unlock(&acpi_device_lock);
 500         return result;
 501 }
 502
 503 static void acpi_device_unregister(struct acpi_device *device, int type)
 504 {
 505         spin_lock(&acpi_device_lock);
 506         if (device->parent) {
 507                 list_del(&device->node);
 508                 list_del(&device->g_list);
 509         } else
 510                 list_del(&device->g_list);
 511
 512         list_del(&device->wakeup_list);
 513         spin_unlock(&acpi_device_lock);
 514
 515         acpi_detach_data(device->handle, acpi_bus_data_handler);
 516
 517         acpi_device_remove_files(device);
 518         device_unregister(&device->dev);
 519 }
 520
 521 /* --------------------------------------------------------------------------
 522                                  Driver Management
 523    -------------------------------------------------------------------------- */
 524 /**
 525  * acpi_bus_driver_init - add a device to a driver
 526  * @device: the device to add and initialize
 527  * @driver: driver for the device
 528  *
 529  * Used to initialize a device via its device driver.  Called whenever a
 530  * driver is bound to a device.  Invokes the driver's add() ops.
 531  */
 532 static int
 533 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 534 {
 535         int result = 0;
 536
 537
 538         if (!device || !driver)
 539                 return -EINVAL;
 540
 541         if (!driver->ops.add)
 542                 return -ENOSYS;
 543
 544         result = driver->ops.add(device);
 545         if (result) {
 546                 device->driver = NULL;
 547                 device->driver_data = NULL;
 548                 return result;
 549         }
 550
 551         device->driver = driver;
 552
 553         /*
 554          * TBD - Configuration Management: Assign resources to device based
 555          * upon possible configuration and currently allocated resources.
 556          */
 557
 558         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 559                           "Driver successfully bound to device\n"));
 560         return 0;
 561 }
 562
 563 static int acpi_start_single_object(struct acpi_device *device)
 564 {
 565         int result = 0;
 566         struct acpi_driver *driver;
 567
 568
 569         if (!(driver = device->driver))
 570                 return 0;
 571
 572         if (driver->ops.start) {
 573                 result = driver->ops.start(device);
 574                 if (result && driver->ops.remove)
 575                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 576         }
 577
 578         return result;
 579 }
 580
 581 /**
 582  * acpi_bus_register_driver - register a driver with the ACPI bus
 583  * @driver: driver being registered
 584  *
 585  * Registers a driver with the ACPI bus.  Searches the namespace for all
 586  * devices that match the driver's criteria and binds.  Returns zero for
 587  * success or a negative error status for failure.
 588  */
 589 int acpi_bus_register_driver(struct acpi_driver *driver)
 590 {
 591         int ret;
 592
 593         if (acpi_disabled)
 594                 return -ENODEV;
 595         driver->drv.name = driver->name;
 596         driver->drv.bus = &acpi_bus_type;
 597         driver->drv.owner = driver->owner;
 598
 599         ret = driver_register(&driver->drv);
 600         return ret;
 601 }
 602
 603 EXPORT_SYMBOL(acpi_bus_register_driver);
 604
 605 /**
 606  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 607  * @driver: driver to unregister
 608  *
 609  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 610  * devices that match the driver's criteria and unbinds.
 611  */
 612 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 613 {
 614         driver_unregister(&driver->drv);
 615 }
 616
 617 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 618
 619 /* --------------------------------------------------------------------------
 620                                  Device Enumeration
 621    -------------------------------------------------------------------------- */
 622 acpi_status
 623 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 624 {
 625         acpi_status status;
 626         acpi_handle tmp;
 627         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 628         union acpi_object *obj;
 629
 630         status = acpi_get_handle(handle, "_EJD", &tmp);
 631         if (ACPI_FAILURE(status))
 632                 return status;
 633
 634         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 635         if (ACPI_SUCCESS(status)) {
 636                 obj = buffer.pointer;
 637                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 638                                          ejd);
 639                 kfree(buffer.pointer);
 640         }
 641         return status;
 642 }
 643 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 644
 645 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 646 {
 647
 648         /* TBD */
 649
 650         return;
 651 }
 652
 653 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 654 {
 655         device->performance.state = ACPI_STATE_UNKNOWN;
 656         return 0;
 657 }
 658
 659 static acpi_status
 660 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 661                                              union acpi_object *package)
 662 {
 663         int i = 0;
 664         union acpi_object *element = NULL;
 665
 666         if (!device || !package || (package->package.count < 2))
 667                 return AE_BAD_PARAMETER;
 668
 669         element = &(package->package.elements[0]);
 670         if (!element)
 671                 return AE_BAD_PARAMETER;
 672         if (element->type == ACPI_TYPE_PACKAGE) {
 673                 if ((element->package.count < 2) ||
 674                     (element->package.elements[0].type !=
 675                      ACPI_TYPE_LOCAL_REFERENCE)
 676                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 677                         return AE_BAD_DATA;
 678                 device->wakeup.gpe_device =
 679                     element->package.elements[0].reference.handle;
 680                 device->wakeup.gpe_number =
 681                     (u32) element->package.elements[1].integer.value;
 682         } else if (element->type == ACPI_TYPE_INTEGER) {
 683                 device->wakeup.gpe_number = element->integer.value;
 684         } else
 685                 return AE_BAD_DATA;
 686
 687         element = &(package->package.elements[1]);
 688         if (element->type != ACPI_TYPE_INTEGER) {
 689                 return AE_BAD_DATA;
 690         }
 691         device->wakeup.sleep_state = element->integer.value;
 692
 693         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 694                 return AE_NO_MEMORY;
 695         }
 696         device->wakeup.resources.count = package->package.count - 2;
 697         for (i = 0; i < device->wakeup.resources.count; i++) {
 698                 element = &(package->package.elements[i + 2]);
 699                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 700                         return AE_BAD_DATA;
 701
 702                 device->wakeup.resources.handles[i] = element->reference.handle;
 703         }
 704
 705         return AE_OK;
 706 }
 707
 708 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 709 {
 710         acpi_status status = 0;
 711         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 712         union acpi_object *package = NULL;
 713         int psw_error;
 714
 715         struct acpi_device_id button_device_ids[] = {
 716                 {"PNP0C0D", 0},
 717                 {"PNP0C0C", 0},
 718                 {"PNP0C0E", 0},
 719                 {"", 0},
 720         };
 721
 722         /* _PRW */
 723         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 724         if (ACPI_FAILURE(status)) {
 725                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 726                 goto end;
 727         }
 728
 729         package = (union acpi_object *)buffer.pointer;
 730         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 731         if (ACPI_FAILURE(status)) {
 732                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 733                 goto end;
 734         }
 735
 736         kfree(buffer.pointer);
 737
 738         device->wakeup.flags.valid = 1;
 739         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 740          * system for the ACPI device with the _PRW object.
 741          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 742          * So it is necessary to call _DSW object first. Only when it is not
 743          * present will the _PSW object used.
 744          */
 745         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 746         if (psw_error)
 747                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 748                                 "error in _DSW or _PSW evaluation\n"));
 749
 750         /* Power button, Lid switch always enable wakeup */
 751         if (!acpi_match_device_ids(device, button_device_ids))
 752                 device->wakeup.flags.run_wake = 1;
 753
 754       end:
 755         if (ACPI_FAILURE(status))
 756                 device->flags.wake_capable = 0;
 757         return 0;
 758 }
 759
 760 static int acpi_bus_get_power_flags(struct acpi_device *device)
 761 {
 762         acpi_status status = 0;
 763         acpi_handle handle = NULL;
 764         u32 i = 0;
 765
 766
 767         /*
 768          * Power Management Flags
 769          */
 770         status = acpi_get_handle(device->handle, "_PSC", &handle);
 771         if (ACPI_SUCCESS(status))
 772                 device->power.flags.explicit_get = 1;
 773         status = acpi_get_handle(device->handle, "_IRC", &handle);
 774         if (ACPI_SUCCESS(status))
 775                 device->power.flags.inrush_current = 1;
 776
 777         /*
 778          * Enumerate supported power management states
 779          */
 780         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 781                 struct acpi_device_power_state *ps = &device->power.states[i];
 782                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 783
 784                 /* Evaluate "_PRx" to se if power resources are referenced */
 785                 acpi_evaluate_reference(device->handle, object_name, NULL,
 786                                         &ps->resources);
 787                 if (ps->resources.count) {
 788                         device->power.flags.power_resources = 1;
 789                         ps->flags.valid = 1;
 790                 }
 791
 792                 /* Evaluate "_PSx" to see if we can do explicit sets */
 793                 object_name[2] = 'S';
 794                 status = acpi_get_handle(device->handle, object_name, &handle);
 795                 if (ACPI_SUCCESS(status)) {
 796                         ps->flags.explicit_set = 1;
 797                         ps->flags.valid = 1;
 798                 }
 799
 800                 /* State is valid if we have some power control */
 801                 if (ps->resources.count || ps->flags.explicit_set)
 802                         ps->flags.valid = 1;
 803
 804                 ps->power = -1; /* Unknown - driver assigned */
 805                 ps->latency = -1;       /* Unknown - driver assigned */
 806         }
 807
 808         /* Set defaults for D0 and D3 states (always valid) */
 809         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 810         device->power.states[ACPI_STATE_D0].power = 100;
 811         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 812         device->power.states[ACPI_STATE_D3].power = 0;
 813
 814         /* TBD: System wake support and resource requirements. */
 815
 816         device->power.state = ACPI_STATE_UNKNOWN;
 817         acpi_bus_get_power(device->handle, &(device->power.state));
 818
 819         return 0;
 820 }
 821
 822 static int acpi_bus_get_flags(struct acpi_device *device)
 823 {
 824         acpi_status status = AE_OK;
 825         acpi_handle temp = NULL;
 826
 827
 828         /* Presence of _STA indicates 'dynamic_status' */
 829         status = acpi_get_handle(device->handle, "_STA", &temp);
 830         if (ACPI_SUCCESS(status))
 831                 device->flags.dynamic_status = 1;
 832
 833         /* Presence of _CID indicates 'compatible_ids' */
 834         status = acpi_get_handle(device->handle, "_CID", &temp);
 835         if (ACPI_SUCCESS(status))
 836                 device->flags.compatible_ids = 1;
 837
 838         /* Presence of _RMV indicates 'removable' */
 839         status = acpi_get_handle(device->handle, "_RMV", &temp);
 840         if (ACPI_SUCCESS(status))
 841                 device->flags.removable = 1;
 842
 843         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 844         status = acpi_get_handle(device->handle, "_EJD", &temp);
 845         if (ACPI_SUCCESS(status))
 846                 device->flags.ejectable = 1;
 847         else {
 848                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 849                 if (ACPI_SUCCESS(status))
 850                         device->flags.ejectable = 1;
 851         }
 852
 853         /* Presence of _LCK indicates 'lockable' */
 854         status = acpi_get_handle(device->handle, "_LCK", &temp);
 855         if (ACPI_SUCCESS(status))
 856                 device->flags.lockable = 1;
 857
 858         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 859         status = acpi_get_handle(device->handle, "_PS0", &temp);
 860         if (ACPI_FAILURE(status))
 861                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 862         if (ACPI_SUCCESS(status))
 863                 device->flags.power_manageable = 1;
 864
 865         /* Presence of _PRW indicates wake capable */
 866         status = acpi_get_handle(device->handle, "_PRW", &temp);
 867         if (ACPI_SUCCESS(status))
 868                 device->flags.wake_capable = 1;
 869
 870         /* TBD: Performance management */
 871
 872         return 0;
 873 }
 874
 875 static void acpi_device_get_busid(struct acpi_device *device,
 876                                   acpi_handle handle, int type)
 877 {
 878         char bus_id[5] = { '?', 0 };
 879         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 880         int i = 0;
 881
 882         /*
 883          * Bus ID
 884          * ------
 885          * The device's Bus ID is simply the object name.
 886          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 887          */
 888         switch (type) {
 889         case ACPI_BUS_TYPE_SYSTEM:
 890                 strcpy(device->pnp.bus_id, "ACPI");
 891                 break;
 892         case ACPI_BUS_TYPE_POWER_BUTTON:
 893                 strcpy(device->pnp.bus_id, "PWRF");
 894                 break;
 895         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 896                 strcpy(device->pnp.bus_id, "SLPF");
 897                 break;
 898         default:
 899                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 900                 /* Clean up trailing underscores (if any) */
 901                 for (i = 3; i > 1; i--) {
 902                         if (bus_id[i] == '_')
 903                                 bus_id[i] = '\0';
 904                         else
 905                                 break;
 906                 }
 907                 strcpy(device->pnp.bus_id, bus_id);
 908                 break;
 909         }
 910 }
 911
 912 /*
 913  * acpi_bay_match - see if a device is an ejectable driver bay
 914  *
 915  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 916  * then we can safely call it an ejectable drive bay
 917  */
 918 static int acpi_bay_match(struct acpi_device *device){
 919         acpi_status status;
 920         acpi_handle handle;
 921         acpi_handle tmp;
 922         acpi_handle phandle;
 923
 924         handle = device->handle;
 925
 926         status = acpi_get_handle(handle, "_EJ0", &tmp);
 927         if (ACPI_FAILURE(status))
 928                 return -ENODEV;
 929
 930         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 931                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 932                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 933                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 934                 return 0;
 935
 936         if (acpi_get_parent(handle, &phandle))
 937                 return -ENODEV;
 938
 939         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 940                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 941                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 942                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 943                 return 0;
 944
 945         return -ENODEV;
 946 }
 947
 948 /*
 949  * acpi_dock_match - see if a device has a _DCK method
 950  */
 951 static int acpi_dock_match(struct acpi_device *device)
 952 {
 953         acpi_handle tmp;
 954         return acpi_get_handle(device->handle, "_DCK", &tmp);
 955 }
 956
 957 static void acpi_device_set_id(struct acpi_device *device,
 958                                struct acpi_device *parent, acpi_handle handle,
 959                                int type)
 960 {
 961         struct acpi_device_info *info;
 962         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 963         char *hid = NULL;
 964         char *uid = NULL;
 965         struct acpi_compatible_id_list *cid_list = NULL;
 966         const char *cid_add = NULL;
 967         acpi_status status;
 968
 969         switch (type) {
 970         case ACPI_BUS_TYPE_DEVICE:
 971                 status = acpi_get_object_info(handle, &buffer);
 972                 if (ACPI_FAILURE(status)) {
 973                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
 974                         return;
 975                 }
 976
 977                 info = buffer.pointer;
 978                 if (info->valid & ACPI_VALID_HID)
 979                         hid = info->hardware_id.value;
 980                 if (info->valid & ACPI_VALID_UID)
 981                         uid = info->unique_id.value;
 982                 if (info->valid & ACPI_VALID_CID)
 983                         cid_list = &info->compatibility_id;
 984                 if (info->valid & ACPI_VALID_ADR) {
 985                         device->pnp.bus_address = info->address;
 986                         device->flags.bus_address = 1;
 987                 }
 988
 989                 /* If we have a video/bay/dock device, add our selfdefined
 990                    HID to the CID list. Like that the video/bay/dock drivers
 991                    will get autoloaded and the device might still match
 992                    against another driver.
 993                 */
 994                 if (acpi_is_video_device(device))
 995                         cid_add = ACPI_VIDEO_HID;
 996                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
 997                         cid_add = ACPI_BAY_HID;
 998                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
 999                         cid_add = ACPI_DOCK_HID;
1000
1001                 break;
1002         case ACPI_BUS_TYPE_POWER:
1003                 hid = ACPI_POWER_HID;
1004                 break;
1005         case ACPI_BUS_TYPE_PROCESSOR:
1006                 hid = ACPI_PROCESSOR_OBJECT_HID;
1007                 break;
1008         case ACPI_BUS_TYPE_SYSTEM:
1009                 hid = ACPI_SYSTEM_HID;
1010                 break;
1011         case ACPI_BUS_TYPE_THERMAL:
1012                 hid = ACPI_THERMAL_HID;
1013                 break;
1014         case ACPI_BUS_TYPE_POWER_BUTTON:
1015                 hid = ACPI_BUTTON_HID_POWERF;
1016                 break;
1017         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1018                 hid = ACPI_BUTTON_HID_SLEEPF;
1019                 break;
1020         }
1021
1022         /*
1023          * \_SB
1024          * ----
1025          * Fix for the system root bus device -- the only root-level device.
1026          */
1027         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1028                 hid = ACPI_BUS_HID;
1029                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1030                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1031         }
1032
1033         if (hid) {
1034                 strcpy(device->pnp.hardware_id, hid);
1035                 device->flags.hardware_id = 1;
1036         }
1037         if (uid) {
1038                 strcpy(device->pnp.unique_id, uid);
1039                 device->flags.unique_id = 1;
1040         }
1041         if (cid_list || cid_add) {
1042                 struct  acpi_compatible_id_list *list;
1043                 int size = 0;
1044                 int count = 0;
1045
1046                 if (cid_list) {
1047                         size = cid_list->size;
1048                 } else if (cid_add) {
1049                         size = sizeof(struct acpi_compatible_id_list);
1050                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1051                         if (!cid_list) {
1052                                 printk(KERN_ERR "Memory allocation error\n");
1053                                 kfree(buffer.pointer);
1054                                 return;
1055                         } else {
1056                                 cid_list->count = 0;
1057                                 cid_list->size = size;
1058                         }
1059                 }
1060                 if (cid_add)
1061                         size += sizeof(struct acpi_compatible_id);
1062                 list = kmalloc(size, GFP_KERNEL);
1063
1064                 if (list) {
1065                         if (cid_list) {
1066                                 memcpy(list, cid_list, cid_list->size);
1067                                 count = cid_list->count;
1068                         }
1069                         if (cid_add) {
1070                                 strncpy(list->id[count].value, cid_add,
1071                                         ACPI_MAX_CID_LENGTH);
1072                                 count++;
1073                                 device->flags.compatible_ids = 1;
1074                         }
1075                         list->size = size;
1076                         list->count = count;
1077                         device->pnp.cid_list = list;
1078                 } else
1079                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1080         }
1081
1082         kfree(buffer.pointer);
1083 }
1084
1085 static int acpi_device_set_context(struct acpi_device *device, int type)
1086 {
1087         acpi_status status = AE_OK;
1088         int result = 0;
1089         /*
1090          * Context
1091          * -------
1092          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1093          * resolutions from handle->device very efficient.  Note that we need
1094          * to be careful with fixed-feature devices as they all attach to the
1095          * root object.
1096          */
1097         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1098             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1099                 status = acpi_attach_data(device->handle,
1100                                           acpi_bus_data_handler, device);
1101
1102                 if (ACPI_FAILURE(status)) {
1103                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1104                         result = -ENODEV;
1105                 }
1106         }
1107         return result;
1108 }
1109
1110 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1111 {
1112         if (!dev)
1113                 return -EINVAL;
1114
1115         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1116         device_release_driver(&dev->dev);
1117
1118         if (!rmdevice)
1119                 return 0;
1120
1121         /*
1122          * unbind _ADR-Based Devices when hot removal
1123          */
1124         if (dev->flags.bus_address) {
1125                 if ((dev->parent) && (dev->parent->ops.unbind))
1126                         dev->parent->ops.unbind(dev);
1127         }
1128         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1129
1130         return 0;
1131 }
1132
1133 static int
1134 acpi_add_single_object(struct acpi_device **child,
1135                        struct acpi_device *parent, acpi_handle handle, int type,
1136                         struct acpi_bus_ops *ops)
1137 {
1138         int result = 0;
1139         struct acpi_device *device = NULL;
1140
1141
1142         if (!child)
1143                 return -EINVAL;
1144
1145         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1146         if (!device) {
1147                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1148                 return -ENOMEM;
1149         }
1150
1151         device->handle = handle;
1152         device->parent = parent;
1153         device->bus_ops = *ops; /* workround for not call .start */
1154
1155
1156         acpi_device_get_busid(device, handle, type);
1157
1158         /*
1159          * Flags
1160          * -----
1161          * Get prior to calling acpi_bus_get_status() so we know whether
1162          * or not _STA is present.  Note that we only look for object
1163          * handles -- cannot evaluate objects until we know the device is
1164          * present and properly initialized.
1165          */
1166         result = acpi_bus_get_flags(device);
1167         if (result)
1168                 goto end;
1169
1170         /*
1171          * Status
1172          * ------
1173          * See if the device is present.  We always assume that non-Device
1174          * and non-Processor objects (e.g. thermal zones, power resources,
1175          * etc.) are present, functioning, etc. (at least when parent object
1176          * is present).  Note that _STA has a different meaning for some
1177          * objects (e.g. power resources) so we need to be careful how we use
1178          * it.
1179          */
1180         switch (type) {
1181         case ACPI_BUS_TYPE_PROCESSOR:
1182         case ACPI_BUS_TYPE_DEVICE:
1183                 result = acpi_bus_get_status(device);
1184                 if (ACPI_FAILURE(result)) {
1185                         result = -ENODEV;
1186                         goto end;
1187                 }
1188                 /*
1189                  * When the device is neither present nor functional, the
1190                  * device should not be added to Linux ACPI device tree.
1191                  * When the status of the device is not present but functinal,
1192                  * it should be added to Linux ACPI tree. For example : bay
1193                  * device , dock device.
1194                  * In such conditions it is unncessary to check whether it is
1195                  * bay device or dock device.
1196                  */
1197                 if (!device->status.present && !device->status.functional) {
1198                         result = -ENODEV;
1199                         goto end;
1200                 }
1201                 break;
1202         default:
1203                 STRUCT_TO_INT(device->status) =
1204                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1205                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1206                 break;
1207         }
1208
1209         /*
1210          * Initialize Device
1211          * -----------------
1212          * TBD: Synch with Core's enumeration/initialization process.
1213          */
1214
1215         /*
1216          * Hardware ID, Unique ID, & Bus Address
1217          * -------------------------------------
1218          */
1219         acpi_device_set_id(device, parent, handle, type);
1220
1221         /*
1222          * The ACPI device is attached to acpi handle before getting
1223          * the power/wakeup/peformance flags. Otherwise OS can't get
1224          * the corresponding ACPI device by the acpi handle in the course
1225          * of getting the power/wakeup/performance flags.
1226          */
1227         result = acpi_device_set_context(device, type);
1228         if (result)
1229                 goto end;
1230
1231         /*
1232          * Power Management
1233          * ----------------
1234          */
1235         if (device->flags.power_manageable) {
1236                 result = acpi_bus_get_power_flags(device);
1237                 if (result)
1238                         goto end;
1239         }
1240
1241         /*
1242          * Wakeup device management
1243          *-----------------------
1244          */
1245         if (device->flags.wake_capable) {
1246                 result = acpi_bus_get_wakeup_device_flags(device);
1247                 if (result)
1248                         goto end;
1249         }
1250
1251         /*
1252          * Performance Management
1253          * ----------------------
1254          */
1255         if (device->flags.performance_manageable) {
1256                 result = acpi_bus_get_perf_flags(device);
1257                 if (result)
1258                         goto end;
1259         }
1260
1261
1262         result = acpi_device_register(device, parent);
1263
1264         /*
1265          * Bind _ADR-Based Devices when hot add
1266          */
1267         if (device->flags.bus_address) {
1268                 if (device->parent && device->parent->ops.bind)
1269                         device->parent->ops.bind(device);
1270         }
1271
1272       end:
1273         if (!result)
1274                 *child = device;
1275         else {
1276                 kfree(device->pnp.cid_list);
1277                 kfree(device);
1278         }
1279
1280         return result;
1281 }
1282
1283 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1284 {
1285         acpi_status status = AE_OK;
1286         struct acpi_device *parent = NULL;
1287         struct acpi_device *child = NULL;
1288         acpi_handle phandle = NULL;
1289         acpi_handle chandle = NULL;
1290         acpi_object_type type = 0;
1291         u32 level = 1;
1292
1293
1294         if (!start)
1295                 return -EINVAL;
1296
1297         parent = start;
1298         phandle = start->handle;
1299
1300         /*
1301          * Parse through the ACPI namespace, identify all 'devices', and
1302          * create a new 'struct acpi_device' for each.
1303          */
1304         while ((level > 0) && parent) {
1305
1306                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1307                                               chandle, &chandle);
1308
1309                 /*
1310                  * If this scope is exhausted then move our way back up.
1311                  */
1312                 if (ACPI_FAILURE(status)) {
1313                         level--;
1314                         chandle = phandle;
1315                         acpi_get_parent(phandle, &phandle);
1316                         if (parent->parent)
1317                                 parent = parent->parent;
1318                         continue;
1319                 }
1320
1321                 status = acpi_get_type(chandle, &type);
1322                 if (ACPI_FAILURE(status))
1323                         continue;
1324
1325                 /*
1326                  * If this is a scope object then parse it (depth-first).
1327                  */
1328                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1329                         level++;
1330                         phandle = chandle;
1331                         chandle = NULL;
1332                         continue;
1333                 }
1334
1335                 /*
1336                  * We're only interested in objects that we consider 'devices'.
1337                  */
1338                 switch (type) {
1339                 case ACPI_TYPE_DEVICE:
1340                         type = ACPI_BUS_TYPE_DEVICE;
1341                         break;
1342                 case ACPI_TYPE_PROCESSOR:
1343                         type = ACPI_BUS_TYPE_PROCESSOR;
1344                         break;
1345                 case ACPI_TYPE_THERMAL:
1346                         type = ACPI_BUS_TYPE_THERMAL;
1347                         break;
1348                 case ACPI_TYPE_POWER:
1349                         type = ACPI_BUS_TYPE_POWER;
1350                         break;
1351                 default:
1352                         continue;
1353                 }
1354
1355                 if (ops->acpi_op_add)
1356                         status = acpi_add_single_object(&child, parent,
1357                                 chandle, type, ops);
1358                 else
1359                         status = acpi_bus_get_device(chandle, &child);
1360
1361                 if (ACPI_FAILURE(status))
1362                         continue;
1363
1364                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1365                         status = acpi_start_single_object(child);
1366                         if (ACPI_FAILURE(status))
1367                                 continue;
1368                 }
1369
1370                 /*
1371                  * If the device is present, enabled, and functioning then
1372                  * parse its scope (depth-first).  Note that we need to
1373                  * represent absent devices to facilitate PnP notifications
1374                  * -- but only the subtree head (not all of its children,
1375                  * which will be enumerated when the parent is inserted).
1376                  *
1377                  * TBD: Need notifications and other detection mechanisms
1378                  *      in place before we can fully implement this.
1379                  */
1380                  /*
1381                  * When the device is not present but functional, it is also
1382                  * necessary to scan the children of this device.
1383                  */
1384                 if (child->status.present || (!child->status.present &&
1385                                         child->status.functional)) {
1386                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1387                                                       NULL, NULL);
1388                         if (ACPI_SUCCESS(status)) {
1389                                 level++;
1390                                 phandle = chandle;
1391                                 chandle = NULL;
1392                                 parent = child;
1393                         }
1394                 }
1395         }
1396
1397         return 0;
1398 }
1399
1400 int
1401 acpi_bus_add(struct acpi_device **child,
1402              struct acpi_device *parent, acpi_handle handle, int type)
1403 {
1404         int result;
1405         struct acpi_bus_ops ops;
1406
1407         memset(&ops, 0, sizeof(ops));
1408         ops.acpi_op_add = 1;
1409
1410         result = acpi_add_single_object(child, parent, handle, type, &ops);
1411         if (!result)
1412                 result = acpi_bus_scan(*child, &ops);
1413
1414         return result;
1415 }
1416
1417 EXPORT_SYMBOL(acpi_bus_add);
1418
1419 int acpi_bus_start(struct acpi_device *device)
1420 {
1421         int result;
1422         struct acpi_bus_ops ops;
1423
1424
1425         if (!device)
1426                 return -EINVAL;
1427
1428         result = acpi_start_single_object(device);
1429         if (!result) {
1430                 memset(&ops, 0, sizeof(ops));
1431                 ops.acpi_op_start = 1;
1432                 result = acpi_bus_scan(device, &ops);
1433         }
1434         return result;
1435 }
1436
1437 EXPORT_SYMBOL(acpi_bus_start);
1438
1439 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1440 {
1441         acpi_status status;
1442         struct acpi_device *parent, *child;
1443         acpi_handle phandle, chandle;
1444         acpi_object_type type;
1445         u32 level = 1;
1446         int err = 0;
1447
1448         parent = start;
1449         phandle = start->handle;
1450         child = chandle = NULL;
1451
1452         while ((level > 0) && parent && (!err)) {
1453                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1454                                               chandle, &chandle);
1455
1456                 /*
1457                  * If this scope is exhausted then move our way back up.
1458                  */
1459                 if (ACPI_FAILURE(status)) {
1460                         level--;
1461                         chandle = phandle;
1462                         acpi_get_parent(phandle, &phandle);
1463                         child = parent;
1464                         parent = parent->parent;
1465
1466                         if (level == 0)
1467                                 err = acpi_bus_remove(child, rmdevice);
1468                         else
1469                                 err = acpi_bus_remove(child, 1);
1470
1471                         continue;
1472                 }
1473
1474                 status = acpi_get_type(chandle, &type);
1475                 if (ACPI_FAILURE(status)) {
1476                         continue;
1477                 }
1478                 /*
1479                  * If there is a device corresponding to chandle then
1480                  * parse it (depth-first).
1481                  */
1482                 if (acpi_bus_get_device(chandle, &child) == 0) {
1483                         level++;
1484                         phandle = chandle;
1485                         chandle = NULL;
1486                         parent = child;
1487                 }
1488                 continue;
1489         }
1490         return err;
1491 }
1492 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1493
1494
1495 static int acpi_bus_scan_fixed(struct acpi_device *root)
1496 {
1497         int result = 0;
1498         struct acpi_device *device = NULL;
1499         struct acpi_bus_ops ops;
1500
1501         if (!root)
1502                 return -ENODEV;
1503
1504         memset(&ops, 0, sizeof(ops));
1505         ops.acpi_op_add = 1;
1506         ops.acpi_op_start = 1;
1507
1508         /*
1509          * Enumerate all fixed-feature devices.
1510          */
1511         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1512                 result = acpi_add_single_object(&device, acpi_root,
1513                                                 NULL,
1514                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1515                                                 &ops);
1516         }
1517
1518         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1519                 result = acpi_add_single_object(&device, acpi_root,
1520                                                 NULL,
1521                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1522                                                 &ops);
1523         }
1524
1525         return result;
1526 }
1527
1528
1529 static int __init acpi_scan_init(void)
1530 {
1531         int result;
1532         struct acpi_bus_ops ops;
1533
1534
1535         if (acpi_disabled)
1536                 return 0;
1537
1538         memset(&ops, 0, sizeof(ops));
1539         ops.acpi_op_add = 1;
1540         ops.acpi_op_start = 1;
1541
1542         result = bus_register(&acpi_bus_type);
1543         if (result) {
1544                 /* We don't want to quit even if we failed to add suspend/resume */
1545                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1546         }
1547
1548         /*
1549          * Create the root device in the bus's device tree
1550          */
1551         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1552                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1553         if (result)
1554                 goto Done;
1555
1556         /*
1557          * Enumerate devices in the ACPI namespace.
1558          */
1559         result = acpi_bus_scan_fixed(acpi_root);
1560
1561         if (!result)
1562                 result = acpi_bus_scan(acpi_root, &ops);
1563
1564         if (result)
1565                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1566
1567       Done:
1568         return result;
1569 }
1570
1571 subsys_initcall(acpi_scan_init);