drivers/acpi/scan.c

   1 /*
   2  * scan.c - support for transforming the ACPI namespace into individual objects
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/init.h>
   7 #include <linux/kernel.h>
   8 #include <linux/acpi.h>
   9
  10 #include <acpi/acpi_drivers.h>
  11 #include <acpi/acinterp.h>      /* for acpi_ex_eisa_id_to_string() */
  12
  13 #define _COMPONENT              ACPI_BUS_COMPONENT
  14 ACPI_MODULE_NAME("scan");
  15 #define STRUCT_TO_INT(s)        (*((int*)&s))
  16 extern struct acpi_device *acpi_root;
  17
  18 #define ACPI_BUS_CLASS                  "system_bus"
  19 #define ACPI_BUS_HID                    "LNXSYBUS"
  20 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  21
  22 static LIST_HEAD(acpi_device_list);
  23 static LIST_HEAD(acpi_bus_id_list);
  24 DEFINE_SPINLOCK(acpi_device_lock);
  25 LIST_HEAD(acpi_wakeup_device_list);
  26
  27 struct acpi_device_bus_id{
  28         char bus_id[15];
  29         unsigned int instance_no;
  30         struct list_head node;
  31 };
  32
  33 /*
  34  * Creates hid/cid(s) string needed for modalias and uevent
  35  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  36  * char *modalias: "acpi:IBM0001:ACPI0001"
  37 */
  38 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  39                            int size)
  40 {
  41         int len;
  42         int count;
  43
  44         if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
  45                 return -ENODEV;
  46
  47         len = snprintf(modalias, size, "acpi:");
  48         size -= len;
  49
  50         if (acpi_dev->flags.hardware_id) {
  51                 count = snprintf(&modalias[len], size, "%s:",
  52                                  acpi_dev->pnp.hardware_id);
  53                 if (count < 0 || count >= size)
  54                         return -EINVAL;
  55                 len += count;
  56                 size -= count;
  57         }
  58
  59         if (acpi_dev->flags.compatible_ids) {
  60                 struct acpi_compatible_id_list *cid_list;
  61                 int i;
  62
  63                 cid_list = acpi_dev->pnp.cid_list;
  64                 for (i = 0; i < cid_list->count; i++) {
  65                         count = snprintf(&modalias[len], size, "%s:",
  66                                          cid_list->id[i].value);
  67                         if (count < 0 || count >= size) {
  68                                 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
  69                                        acpi_dev->pnp.device_name, i);
  70                                 break;
  71                         }
  72                         len += count;
  73                         size -= count;
  74                 }
  75         }
  76
  77         modalias[len] = '\0';
  78         return len;
  79 }
  80
  81 static ssize_t
  82 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  83         struct acpi_device *acpi_dev = to_acpi_device(dev);
  84         int len;
  85
  86         /* Device has no HID and no CID or string is >1024 */
  87         len = create_modalias(acpi_dev, buf, 1024);
  88         if (len <= 0)
  89                 return 0;
  90         buf[len++] = '\n';
  91         return len;
  92 }
  93 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  94
  95 static int acpi_eject_operation(acpi_handle handle, int lockable)
  96 {
  97         struct acpi_object_list arg_list;
  98         union acpi_object arg;
  99         acpi_status status = AE_OK;
 100
 101         /*
 102          * TBD: evaluate _PS3?
 103          */
 104
 105         if (lockable) {
 106                 arg_list.count = 1;
 107                 arg_list.pointer = &arg;
 108                 arg.type = ACPI_TYPE_INTEGER;
 109                 arg.integer.value = 0;
 110                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 111         }
 112
 113         arg_list.count = 1;
 114         arg_list.pointer = &arg;
 115         arg.type = ACPI_TYPE_INTEGER;
 116         arg.integer.value = 1;
 117
 118         /*
 119          * TBD: _EJD support.
 120          */
 121
 122         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 123         if (ACPI_FAILURE(status)) {
 124                 return (-ENODEV);
 125         }
 126
 127         return (0);
 128 }
 129
 130 static ssize_t
 131 acpi_eject_store(struct device *d, struct device_attribute *attr,
 132                 const char *buf, size_t count)
 133 {
 134         int result;
 135         int ret = count;
 136         int islockable;
 137         acpi_status status;
 138         acpi_handle handle;
 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         islockable = acpi_device->flags.lockable;
 158         handle = acpi_device->handle;
 159
 160         result = acpi_bus_trim(acpi_device, 1);
 161
 162         if (!result)
 163                 result = acpi_eject_operation(handle, islockable);
 164
 165         if (result) {
 166                 ret = -EBUSY;
 167         }
 168       err:
 169         return ret;
 170 }
 171
 172 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 173
 174 static ssize_t
 175 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 176         struct acpi_device *acpi_dev = to_acpi_device(dev);
 177
 178         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
 179 }
 180 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 181
 182 static ssize_t
 183 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 184         struct acpi_device *acpi_dev = to_acpi_device(dev);
 185         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 186         int result;
 187
 188         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 189         if(result)
 190                 goto end;
 191
 192         result = sprintf(buf, "%s\n", (char*)path.pointer);
 193         kfree(path.pointer);
 194   end:
 195         return result;
 196 }
 197 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 198
 199 static int acpi_device_setup_files(struct acpi_device *dev)
 200 {
 201         acpi_status status;
 202         acpi_handle temp;
 203         int result = 0;
 204
 205         /*
 206          * Devices gotten from FADT don't have a "path" attribute
 207          */
 208         if(dev->handle) {
 209                 result = device_create_file(&dev->dev, &dev_attr_path);
 210                 if(result)
 211                         goto end;
 212         }
 213
 214         if(dev->flags.hardware_id) {
 215                 result = device_create_file(&dev->dev, &dev_attr_hid);
 216                 if(result)
 217                         goto end;
 218         }
 219
 220         if (dev->flags.hardware_id || dev->flags.compatible_ids){
 221                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 222                 if(result)
 223                         goto end;
 224         }
 225
 226         /*
 227          * If device has _EJ0, 'eject' file is created that is used to trigger
 228          * hot-removal function from userland.
 229          */
 230         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 231         if (ACPI_SUCCESS(status))
 232                 result = device_create_file(&dev->dev, &dev_attr_eject);
 233   end:
 234         return result;
 235 }
 236
 237 static void acpi_device_remove_files(struct acpi_device *dev)
 238 {
 239         acpi_status status;
 240         acpi_handle temp;
 241
 242         /*
 243          * If device has _EJ0, 'eject' file is created that is used to trigger
 244          * hot-removal function from userland.
 245          */
 246         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 247         if (ACPI_SUCCESS(status))
 248                 device_remove_file(&dev->dev, &dev_attr_eject);
 249
 250         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 251                 device_remove_file(&dev->dev, &dev_attr_modalias);
 252
 253         if(dev->flags.hardware_id)
 254                 device_remove_file(&dev->dev, &dev_attr_hid);
 255         if(dev->handle)
 256                 device_remove_file(&dev->dev, &dev_attr_path);
 257 }
 258 /* --------------------------------------------------------------------------
 259                         ACPI Bus operations
 260    -------------------------------------------------------------------------- */
 261
 262 int acpi_match_device_ids(struct acpi_device *device,
 263                           const struct acpi_device_id *ids)
 264 {
 265         const struct acpi_device_id *id;
 266
 267         if (device->flags.hardware_id) {
 268                 for (id = ids; id->id[0]; id++) {
 269                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 270                                 return 0;
 271                 }
 272         }
 273
 274         if (device->flags.compatible_ids) {
 275                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 276                 int i;
 277
 278                 for (id = ids; id->id[0]; id++) {
 279                         /* compare multiple _CID entries against driver ids */
 280                         for (i = 0; i < cid_list->count; i++) {
 281                                 if (!strcmp((char*)id->id,
 282                                             cid_list->id[i].value))
 283                                         return 0;
 284                         }
 285                 }
 286         }
 287
 288         return -ENOENT;
 289 }
 290 EXPORT_SYMBOL(acpi_match_device_ids);
 291
 292 static void acpi_device_release(struct device *dev)
 293 {
 294         struct acpi_device *acpi_dev = to_acpi_device(dev);
 295
 296         kfree(acpi_dev->pnp.cid_list);
 297         kfree(acpi_dev);
 298 }
 299
 300 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 301 {
 302         struct acpi_device *acpi_dev = to_acpi_device(dev);
 303         struct acpi_driver *acpi_drv = acpi_dev->driver;
 304
 305         if (acpi_drv && acpi_drv->ops.suspend)
 306                 return acpi_drv->ops.suspend(acpi_dev, state);
 307         return 0;
 308 }
 309
 310 static int acpi_device_resume(struct device *dev)
 311 {
 312         struct acpi_device *acpi_dev = to_acpi_device(dev);
 313         struct acpi_driver *acpi_drv = acpi_dev->driver;
 314
 315         if (acpi_drv && acpi_drv->ops.resume)
 316                 return acpi_drv->ops.resume(acpi_dev);
 317         return 0;
 318 }
 319
 320 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 321 {
 322         struct acpi_device *acpi_dev = to_acpi_device(dev);
 323         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 324
 325         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 326 }
 327
 328 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 329 {
 330         struct acpi_device *acpi_dev = to_acpi_device(dev);
 331         int len;
 332
 333         if (add_uevent_var(env, "MODALIAS="))
 334                 return -ENOMEM;
 335         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 336                               sizeof(env->buf) - env->buflen);
 337         if (len >= (sizeof(env->buf) - env->buflen))
 338                 return -ENOMEM;
 339         env->buflen += len;
 340         return 0;
 341 }
 342
 343 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 344 static int acpi_start_single_object(struct acpi_device *);
 345 static int acpi_device_probe(struct device * dev)
 346 {
 347         struct acpi_device *acpi_dev = to_acpi_device(dev);
 348         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 349         int ret;
 350
 351         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 352         if (!ret) {
 353                 if (acpi_dev->bus_ops.acpi_op_start)
 354                         acpi_start_single_object(acpi_dev);
 355                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 356                         "Found driver [%s] for device [%s]\n",
 357                         acpi_drv->name, acpi_dev->pnp.bus_id));
 358                 get_device(dev);
 359         }
 360         return ret;
 361 }
 362
 363 static int acpi_device_remove(struct device * dev)
 364 {
 365         struct acpi_device *acpi_dev = to_acpi_device(dev);
 366         struct acpi_driver *acpi_drv = acpi_dev->driver;
 367
 368         if (acpi_drv) {
 369                 if (acpi_drv->ops.stop)
 370                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 371                 if (acpi_drv->ops.remove)
 372                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 373         }
 374         acpi_dev->driver = NULL;
 375         acpi_driver_data(dev) = NULL;
 376
 377         put_device(dev);
 378         return 0;
 379 }
 380
 381 static void acpi_device_shutdown(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 && acpi_drv->ops.shutdown)
 387                 acpi_drv->ops.shutdown(acpi_dev);
 388
 389         return ;
 390 }
 391
 392 struct bus_type acpi_bus_type = {
 393         .name           = "acpi",
 394         .suspend        = acpi_device_suspend,
 395         .resume         = acpi_device_resume,
 396         .shutdown       = acpi_device_shutdown,
 397         .match          = acpi_bus_match,
 398         .probe          = acpi_device_probe,
 399         .remove         = acpi_device_remove,
 400         .uevent         = acpi_device_uevent,
 401 };
 402
 403 static int acpi_device_register(struct acpi_device *device,
 404                                  struct acpi_device *parent)
 405 {
 406         int result;
 407         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 408         int found = 0;
 409         /*
 410          * Linkage
 411          * -------
 412          * Link this device to its parent and siblings.
 413          */
 414         INIT_LIST_HEAD(&device->children);
 415         INIT_LIST_HEAD(&device->node);
 416         INIT_LIST_HEAD(&device->g_list);
 417         INIT_LIST_HEAD(&device->wakeup_list);
 418
 419         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 420         if (!new_bus_id) {
 421                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 422                 return -ENOMEM;
 423         }
 424
 425         spin_lock(&acpi_device_lock);
 426         /*
 427          * Find suitable bus_id and instance number in acpi_bus_id_list
 428          * If failed, create one and link it into acpi_bus_id_list
 429          */
 430         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 431                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 432                         acpi_device_bus_id->instance_no ++;
 433                         found = 1;
 434                         kfree(new_bus_id);
 435                         break;
 436                 }
 437         }
 438         if(!found) {
 439                 acpi_device_bus_id = new_bus_id;
 440                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 441                 acpi_device_bus_id->instance_no = 0;
 442                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 443         }
 444         sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 445
 446         if (device->parent) {
 447                 list_add_tail(&device->node, &device->parent->children);
 448                 list_add_tail(&device->g_list, &device->parent->g_list);
 449         } else
 450                 list_add_tail(&device->g_list, &acpi_device_list);
 451         if (device->wakeup.flags.valid)
 452                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 453         spin_unlock(&acpi_device_lock);
 454
 455         if (device->parent)
 456                 device->dev.parent = &parent->dev;
 457         device->dev.bus = &acpi_bus_type;
 458         device_initialize(&device->dev);
 459         device->dev.release = &acpi_device_release;
 460         result = device_add(&device->dev);
 461         if(result) {
 462                 printk(KERN_ERR PREFIX "Error adding device %s", device->dev.bus_id);
 463                 goto end;
 464         }
 465
 466         result = acpi_device_setup_files(device);
 467         if(result)
 468                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
 469
 470         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 471         return 0;
 472   end:
 473         spin_lock(&acpi_device_lock);
 474         if (device->parent) {
 475                 list_del(&device->node);
 476                 list_del(&device->g_list);
 477         } else
 478                 list_del(&device->g_list);
 479         list_del(&device->wakeup_list);
 480         spin_unlock(&acpi_device_lock);
 481         return result;
 482 }
 483
 484 static void acpi_device_unregister(struct acpi_device *device, int type)
 485 {
 486         spin_lock(&acpi_device_lock);
 487         if (device->parent) {
 488                 list_del(&device->node);
 489                 list_del(&device->g_list);
 490         } else
 491                 list_del(&device->g_list);
 492
 493         list_del(&device->wakeup_list);
 494         spin_unlock(&acpi_device_lock);
 495
 496         acpi_detach_data(device->handle, acpi_bus_data_handler);
 497
 498         acpi_device_remove_files(device);
 499         device_unregister(&device->dev);
 500 }
 501
 502 /* --------------------------------------------------------------------------
 503                                  Driver Management
 504    -------------------------------------------------------------------------- */
 505 /**
 506  * acpi_bus_driver_init - add a device to a driver
 507  * @device: the device to add and initialize
 508  * @driver: driver for the device
 509  *
 510  * Used to initialize a device via its device driver.  Called whenever a
 511  * driver is bound to a device.  Invokes the driver's add() ops.
 512  */
 513 static int
 514 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 515 {
 516         int result = 0;
 517
 518
 519         if (!device || !driver)
 520                 return -EINVAL;
 521
 522         if (!driver->ops.add)
 523                 return -ENOSYS;
 524
 525         result = driver->ops.add(device);
 526         if (result) {
 527                 device->driver = NULL;
 528                 acpi_driver_data(device) = NULL;
 529                 return result;
 530         }
 531
 532         device->driver = driver;
 533
 534         /*
 535          * TBD - Configuration Management: Assign resources to device based
 536          * upon possible configuration and currently allocated resources.
 537          */
 538
 539         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 540                           "Driver successfully bound to device\n"));
 541         return 0;
 542 }
 543
 544 static int acpi_start_single_object(struct acpi_device *device)
 545 {
 546         int result = 0;
 547         struct acpi_driver *driver;
 548
 549
 550         if (!(driver = device->driver))
 551                 return 0;
 552
 553         if (driver->ops.start) {
 554                 result = driver->ops.start(device);
 555                 if (result && driver->ops.remove)
 556                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 557         }
 558
 559         return result;
 560 }
 561
 562 /**
 563  * acpi_bus_register_driver - register a driver with the ACPI bus
 564  * @driver: driver being registered
 565  *
 566  * Registers a driver with the ACPI bus.  Searches the namespace for all
 567  * devices that match the driver's criteria and binds.  Returns zero for
 568  * success or a negative error status for failure.
 569  */
 570 int acpi_bus_register_driver(struct acpi_driver *driver)
 571 {
 572         int ret;
 573
 574         if (acpi_disabled)
 575                 return -ENODEV;
 576         driver->drv.name = driver->name;
 577         driver->drv.bus = &acpi_bus_type;
 578         driver->drv.owner = driver->owner;
 579
 580         ret = driver_register(&driver->drv);
 581         return ret;
 582 }
 583
 584 EXPORT_SYMBOL(acpi_bus_register_driver);
 585
 586 /**
 587  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 588  * @driver: driver to unregister
 589  *
 590  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 591  * devices that match the driver's criteria and unbinds.
 592  */
 593 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 594 {
 595         driver_unregister(&driver->drv);
 596 }
 597
 598 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 599
 600 /* --------------------------------------------------------------------------
 601                                  Device Enumeration
 602    -------------------------------------------------------------------------- */
 603 acpi_status
 604 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 605 {
 606         acpi_status status;
 607         acpi_handle tmp;
 608         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 609         union acpi_object *obj;
 610
 611         status = acpi_get_handle(handle, "_EJD", &tmp);
 612         if (ACPI_FAILURE(status))
 613                 return status;
 614
 615         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 616         if (ACPI_SUCCESS(status)) {
 617                 obj = buffer.pointer;
 618                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 619                                          ejd);
 620                 kfree(buffer.pointer);
 621         }
 622         return status;
 623 }
 624 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 625
 626 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 627 {
 628
 629         /* TBD */
 630
 631         return;
 632 }
 633
 634 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 635 {
 636         device->performance.state = ACPI_STATE_UNKNOWN;
 637         return 0;
 638 }
 639
 640 static acpi_status
 641 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 642                                              union acpi_object *package)
 643 {
 644         int i = 0;
 645         union acpi_object *element = NULL;
 646
 647         if (!device || !package || (package->package.count < 2))
 648                 return AE_BAD_PARAMETER;
 649
 650         element = &(package->package.elements[0]);
 651         if (!element)
 652                 return AE_BAD_PARAMETER;
 653         if (element->type == ACPI_TYPE_PACKAGE) {
 654                 if ((element->package.count < 2) ||
 655                     (element->package.elements[0].type !=
 656                      ACPI_TYPE_LOCAL_REFERENCE)
 657                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 658                         return AE_BAD_DATA;
 659                 device->wakeup.gpe_device =
 660                     element->package.elements[0].reference.handle;
 661                 device->wakeup.gpe_number =
 662                     (u32) element->package.elements[1].integer.value;
 663         } else if (element->type == ACPI_TYPE_INTEGER) {
 664                 device->wakeup.gpe_number = element->integer.value;
 665         } else
 666                 return AE_BAD_DATA;
 667
 668         element = &(package->package.elements[1]);
 669         if (element->type != ACPI_TYPE_INTEGER) {
 670                 return AE_BAD_DATA;
 671         }
 672         device->wakeup.sleep_state = element->integer.value;
 673
 674         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 675                 return AE_NO_MEMORY;
 676         }
 677         device->wakeup.resources.count = package->package.count - 2;
 678         for (i = 0; i < device->wakeup.resources.count; i++) {
 679                 element = &(package->package.elements[i + 2]);
 680                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 681                         return AE_BAD_DATA;
 682
 683                 device->wakeup.resources.handles[i] = element->reference.handle;
 684         }
 685
 686         return AE_OK;
 687 }
 688
 689 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 690 {
 691         acpi_status status = 0;
 692         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 693         union acpi_object *package = NULL;
 694         int psw_error;
 695
 696         struct acpi_device_id button_device_ids[] = {
 697                 {"PNP0C0D", 0},
 698                 {"PNP0C0C", 0},
 699                 {"PNP0C0E", 0},
 700                 {"", 0},
 701         };
 702
 703         /* _PRW */
 704         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 705         if (ACPI_FAILURE(status)) {
 706                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 707                 goto end;
 708         }
 709
 710         package = (union acpi_object *)buffer.pointer;
 711         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 712         if (ACPI_FAILURE(status)) {
 713                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 714                 goto end;
 715         }
 716
 717         kfree(buffer.pointer);
 718
 719         device->wakeup.flags.valid = 1;
 720         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 721          * system for the ACPI device with the _PRW object.
 722          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 723          * So it is necessary to call _DSW object first. Only when it is not
 724          * present will the _PSW object used.
 725          */
 726         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 727         if (psw_error)
 728                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 729                                 "error in _DSW or _PSW evaluation\n"));
 730
 731         /* Power button, Lid switch always enable wakeup */
 732         if (!acpi_match_device_ids(device, button_device_ids))
 733                 device->wakeup.flags.run_wake = 1;
 734
 735       end:
 736         if (ACPI_FAILURE(status))
 737                 device->flags.wake_capable = 0;
 738         return 0;
 739 }
 740
 741 static int acpi_bus_get_power_flags(struct acpi_device *device)
 742 {
 743         acpi_status status = 0;
 744         acpi_handle handle = NULL;
 745         u32 i = 0;
 746
 747
 748         /*
 749          * Power Management Flags
 750          */
 751         status = acpi_get_handle(device->handle, "_PSC", &handle);
 752         if (ACPI_SUCCESS(status))
 753                 device->power.flags.explicit_get = 1;
 754         status = acpi_get_handle(device->handle, "_IRC", &handle);
 755         if (ACPI_SUCCESS(status))
 756                 device->power.flags.inrush_current = 1;
 757
 758         /*
 759          * Enumerate supported power management states
 760          */
 761         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 762                 struct acpi_device_power_state *ps = &device->power.states[i];
 763                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 764
 765                 /* Evaluate "_PRx" to se if power resources are referenced */
 766                 acpi_evaluate_reference(device->handle, object_name, NULL,
 767                                         &ps->resources);
 768                 if (ps->resources.count) {
 769                         device->power.flags.power_resources = 1;
 770                         ps->flags.valid = 1;
 771                 }
 772
 773                 /* Evaluate "_PSx" to see if we can do explicit sets */
 774                 object_name[2] = 'S';
 775                 status = acpi_get_handle(device->handle, object_name, &handle);
 776                 if (ACPI_SUCCESS(status)) {
 777                         ps->flags.explicit_set = 1;
 778                         ps->flags.valid = 1;
 779                 }
 780
 781                 /* State is valid if we have some power control */
 782                 if (ps->resources.count || ps->flags.explicit_set)
 783                         ps->flags.valid = 1;
 784
 785                 ps->power = -1; /* Unknown - driver assigned */
 786                 ps->latency = -1;       /* Unknown - driver assigned */
 787         }
 788
 789         /* Set defaults for D0 and D3 states (always valid) */
 790         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 791         device->power.states[ACPI_STATE_D0].power = 100;
 792         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 793         device->power.states[ACPI_STATE_D3].power = 0;
 794
 795         /* TBD: System wake support and resource requirements. */
 796
 797         device->power.state = ACPI_STATE_UNKNOWN;
 798
 799         return 0;
 800 }
 801
 802 static int acpi_bus_get_flags(struct acpi_device *device)
 803 {
 804         acpi_status status = AE_OK;
 805         acpi_handle temp = NULL;
 806
 807
 808         /* Presence of _STA indicates 'dynamic_status' */
 809         status = acpi_get_handle(device->handle, "_STA", &temp);
 810         if (ACPI_SUCCESS(status))
 811                 device->flags.dynamic_status = 1;
 812
 813         /* Presence of _CID indicates 'compatible_ids' */
 814         status = acpi_get_handle(device->handle, "_CID", &temp);
 815         if (ACPI_SUCCESS(status))
 816                 device->flags.compatible_ids = 1;
 817
 818         /* Presence of _RMV indicates 'removable' */
 819         status = acpi_get_handle(device->handle, "_RMV", &temp);
 820         if (ACPI_SUCCESS(status))
 821                 device->flags.removable = 1;
 822
 823         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 824         status = acpi_get_handle(device->handle, "_EJD", &temp);
 825         if (ACPI_SUCCESS(status))
 826                 device->flags.ejectable = 1;
 827         else {
 828                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 829                 if (ACPI_SUCCESS(status))
 830                         device->flags.ejectable = 1;
 831         }
 832
 833         /* Presence of _LCK indicates 'lockable' */
 834         status = acpi_get_handle(device->handle, "_LCK", &temp);
 835         if (ACPI_SUCCESS(status))
 836                 device->flags.lockable = 1;
 837
 838         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 839         status = acpi_get_handle(device->handle, "_PS0", &temp);
 840         if (ACPI_FAILURE(status))
 841                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 842         if (ACPI_SUCCESS(status))
 843                 device->flags.power_manageable = 1;
 844
 845         /* Presence of _PRW indicates wake capable */
 846         status = acpi_get_handle(device->handle, "_PRW", &temp);
 847         if (ACPI_SUCCESS(status))
 848                 device->flags.wake_capable = 1;
 849
 850         /* TBD: Performance management */
 851
 852         return 0;
 853 }
 854
 855 static void acpi_device_get_busid(struct acpi_device *device,
 856                                   acpi_handle handle, int type)
 857 {
 858         char bus_id[5] = { '?', 0 };
 859         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 860         int i = 0;
 861
 862         /*
 863          * Bus ID
 864          * ------
 865          * The device's Bus ID is simply the object name.
 866          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 867          */
 868         switch (type) {
 869         case ACPI_BUS_TYPE_SYSTEM:
 870                 strcpy(device->pnp.bus_id, "ACPI");
 871                 break;
 872         case ACPI_BUS_TYPE_POWER_BUTTON:
 873                 strcpy(device->pnp.bus_id, "PWRF");
 874                 break;
 875         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 876                 strcpy(device->pnp.bus_id, "SLPF");
 877                 break;
 878         default:
 879                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 880                 /* Clean up trailing underscores (if any) */
 881                 for (i = 3; i > 1; i--) {
 882                         if (bus_id[i] == '_')
 883                                 bus_id[i] = '\0';
 884                         else
 885                                 break;
 886                 }
 887                 strcpy(device->pnp.bus_id, bus_id);
 888                 break;
 889         }
 890 }
 891
 892 static int
 893 acpi_video_bus_match(struct acpi_device *device)
 894 {
 895         acpi_handle h_dummy;
 896
 897         if (!device)
 898                 return -EINVAL;
 899
 900         /* Since there is no HID, CID for ACPI Video drivers, we have
 901          * to check well known required nodes for each feature we support.
 902          */
 903
 904         /* Does this device able to support video switching ? */
 905         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) &&
 906             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
 907                 return 0;
 908
 909         /* Does this device able to retrieve a video ROM ? */
 910         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
 911                 return 0;
 912
 913         /* Does this device able to configure which video head to be POSTed ? */
 914         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) &&
 915             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) &&
 916             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy)))
 917                 return 0;
 918
 919         return -ENODEV;
 920 }
 921
 922 /*
 923  * acpi_bay_match - see if a device is an ejectable driver bay
 924  *
 925  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 926  * then we can safely call it an ejectable drive bay
 927  */
 928 static int acpi_bay_match(struct acpi_device *device){
 929         acpi_status status;
 930         acpi_handle handle;
 931         acpi_handle tmp;
 932         acpi_handle phandle;
 933
 934         handle = device->handle;
 935
 936         status = acpi_get_handle(handle, "_EJ0", &tmp);
 937         if (ACPI_FAILURE(status))
 938                 return -ENODEV;
 939
 940         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 941                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 942                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 943                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 944                 return 0;
 945
 946         if (acpi_get_parent(handle, &phandle))
 947                 return -ENODEV;
 948
 949         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 950                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 951                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 952                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 953                 return 0;
 954
 955         return -ENODEV;
 956 }
 957
 958 /*
 959  * acpi_dock_match - see if a device has a _DCK method
 960  */
 961 static int acpi_dock_match(struct acpi_device *device)
 962 {
 963         acpi_handle tmp;
 964         return acpi_get_handle(device->handle, "_DCK", &tmp);
 965 }
 966
 967 static void acpi_device_set_id(struct acpi_device *device,
 968                                struct acpi_device *parent, acpi_handle handle,
 969                                int type)
 970 {
 971         struct acpi_device_info *info;
 972         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 973         char *hid = NULL;
 974         char *uid = NULL;
 975         struct acpi_compatible_id_list *cid_list = NULL;
 976         const char *cid_add = NULL;
 977         acpi_status status;
 978
 979         switch (type) {
 980         case ACPI_BUS_TYPE_DEVICE:
 981                 status = acpi_get_object_info(handle, &buffer);
 982                 if (ACPI_FAILURE(status)) {
 983                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
 984                         return;
 985                 }
 986
 987                 info = buffer.pointer;
 988                 if (info->valid & ACPI_VALID_HID)
 989                         hid = info->hardware_id.value;
 990                 if (info->valid & ACPI_VALID_UID)
 991                         uid = info->unique_id.value;
 992                 if (info->valid & ACPI_VALID_CID)
 993                         cid_list = &info->compatibility_id;
 994                 if (info->valid & ACPI_VALID_ADR) {
 995                         device->pnp.bus_address = info->address;
 996                         device->flags.bus_address = 1;
 997                 }
 998
 999                 /* If we have a video/bay/dock device, add our selfdefined
1000                    HID to the CID list. Like that the video/bay/dock drivers
1001                    will get autoloaded and the device might still match
1002                    against another driver.
1003                 */
1004                 if (ACPI_SUCCESS(acpi_video_bus_match(device)))
1005                         cid_add = ACPI_VIDEO_HID;
1006                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1007                         cid_add = ACPI_BAY_HID;
1008                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1009                         cid_add = ACPI_DOCK_HID;
1010
1011                 break;
1012         case ACPI_BUS_TYPE_POWER:
1013                 hid = ACPI_POWER_HID;
1014                 break;
1015         case ACPI_BUS_TYPE_PROCESSOR:
1016                 hid = ACPI_PROCESSOR_HID;
1017                 break;
1018         case ACPI_BUS_TYPE_SYSTEM:
1019                 hid = ACPI_SYSTEM_HID;
1020                 break;
1021         case ACPI_BUS_TYPE_THERMAL:
1022                 hid = ACPI_THERMAL_HID;
1023                 break;
1024         case ACPI_BUS_TYPE_POWER_BUTTON:
1025                 hid = ACPI_BUTTON_HID_POWERF;
1026                 break;
1027         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1028                 hid = ACPI_BUTTON_HID_SLEEPF;
1029                 break;
1030         }
1031
1032         /*
1033          * \_SB
1034          * ----
1035          * Fix for the system root bus device -- the only root-level device.
1036          */
1037         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1038                 hid = ACPI_BUS_HID;
1039                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1040                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1041         }
1042
1043         if (hid) {
1044                 strcpy(device->pnp.hardware_id, hid);
1045                 device->flags.hardware_id = 1;
1046         }
1047         if (uid) {
1048                 strcpy(device->pnp.unique_id, uid);
1049                 device->flags.unique_id = 1;
1050         }
1051         if (cid_list || cid_add) {
1052                 struct  acpi_compatible_id_list *list;
1053                 int size = 0;
1054                 int count = 0;
1055
1056                 if (cid_list) {
1057                         size = cid_list->size;
1058                 } else if (cid_add) {
1059                         size = sizeof(struct acpi_compatible_id_list);
1060                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1061                         if (!cid_list) {
1062                                 printk(KERN_ERR "Memory allocation error\n");
1063                                 kfree(buffer.pointer);
1064                                 return;
1065                         } else {
1066                                 cid_list->count = 0;
1067                                 cid_list->size = size;
1068                         }
1069                 }
1070                 if (cid_add)
1071                         size += sizeof(struct acpi_compatible_id);
1072                 list = kmalloc(size, GFP_KERNEL);
1073
1074                 if (list) {
1075                         if (cid_list) {
1076                                 memcpy(list, cid_list, cid_list->size);
1077                                 count = cid_list->count;
1078                         }
1079                         if (cid_add) {
1080                                 strncpy(list->id[count].value, cid_add,
1081                                         ACPI_MAX_CID_LENGTH);
1082                                 count++;
1083                                 device->flags.compatible_ids = 1;
1084                         }
1085                         list->size = size;
1086                         list->count = count;
1087                         device->pnp.cid_list = list;
1088                 } else
1089                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1090         }
1091
1092         kfree(buffer.pointer);
1093 }
1094
1095 static int acpi_device_set_context(struct acpi_device *device, int type)
1096 {
1097         acpi_status status = AE_OK;
1098         int result = 0;
1099         /*
1100          * Context
1101          * -------
1102          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1103          * resolutions from handle->device very efficient.  Note that we need
1104          * to be careful with fixed-feature devices as they all attach to the
1105          * root object.
1106          */
1107         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1108             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1109                 status = acpi_attach_data(device->handle,
1110                                           acpi_bus_data_handler, device);
1111
1112                 if (ACPI_FAILURE(status)) {
1113                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1114                         result = -ENODEV;
1115                 }
1116         }
1117         return result;
1118 }
1119
1120 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1121 {
1122         if (!dev)
1123                 return -EINVAL;
1124
1125         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1126         device_release_driver(&dev->dev);
1127
1128         if (!rmdevice)
1129                 return 0;
1130
1131         /*
1132          * unbind _ADR-Based Devices when hot removal
1133          */
1134         if (dev->flags.bus_address) {
1135                 if ((dev->parent) && (dev->parent->ops.unbind))
1136                         dev->parent->ops.unbind(dev);
1137         }
1138         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1139
1140         return 0;
1141 }
1142
1143 static int
1144 acpi_is_child_device(struct acpi_device *device,
1145                         int (*matcher)(struct acpi_device *))
1146 {
1147         int result = -ENODEV;
1148
1149         do {
1150                 if (ACPI_SUCCESS(matcher(device)))
1151                         return AE_OK;
1152         } while ((device = device->parent));
1153
1154         return result;
1155 }
1156
1157 static int
1158 acpi_add_single_object(struct acpi_device **child,
1159                        struct acpi_device *parent, acpi_handle handle, int type,
1160                         struct acpi_bus_ops *ops)
1161 {
1162         int result = 0;
1163         struct acpi_device *device = NULL;
1164
1165
1166         if (!child)
1167                 return -EINVAL;
1168
1169         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1170         if (!device) {
1171                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1172                 return -ENOMEM;
1173         }
1174
1175         device->handle = handle;
1176         device->parent = parent;
1177         device->bus_ops = *ops; /* workround for not call .start */
1178
1179
1180         acpi_device_get_busid(device, handle, type);
1181
1182         /*
1183          * Flags
1184          * -----
1185          * Get prior to calling acpi_bus_get_status() so we know whether
1186          * or not _STA is present.  Note that we only look for object
1187          * handles -- cannot evaluate objects until we know the device is
1188          * present and properly initialized.
1189          */
1190         result = acpi_bus_get_flags(device);
1191         if (result)
1192                 goto end;
1193
1194         /*
1195          * Status
1196          * ------
1197          * See if the device is present.  We always assume that non-Device
1198          * and non-Processor objects (e.g. thermal zones, power resources,
1199          * etc.) are present, functioning, etc. (at least when parent object
1200          * is present).  Note that _STA has a different meaning for some
1201          * objects (e.g. power resources) so we need to be careful how we use
1202          * it.
1203          */
1204         switch (type) {
1205         case ACPI_BUS_TYPE_PROCESSOR:
1206         case ACPI_BUS_TYPE_DEVICE:
1207                 result = acpi_bus_get_status(device);
1208                 if (ACPI_FAILURE(result)) {
1209                         result = -ENODEV;
1210                         goto end;
1211                 }
1212                 if (!device->status.present) {
1213                         /* Bay and dock should be handled even if absent */
1214                         if (!ACPI_SUCCESS(
1215                              acpi_is_child_device(device, acpi_bay_match)) &&
1216                             !ACPI_SUCCESS(
1217                              acpi_is_child_device(device, acpi_dock_match))) {
1218                                         result = -ENODEV;
1219                                         goto end;
1220                         }
1221                 }
1222                 break;
1223         default:
1224                 STRUCT_TO_INT(device->status) =
1225                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1226                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1227                 break;
1228         }
1229
1230         /*
1231          * Initialize Device
1232          * -----------------
1233          * TBD: Synch with Core's enumeration/initialization process.
1234          */
1235
1236         /*
1237          * Hardware ID, Unique ID, & Bus Address
1238          * -------------------------------------
1239          */
1240         acpi_device_set_id(device, parent, handle, type);
1241
1242         /*
1243          * Power Management
1244          * ----------------
1245          */
1246         if (device->flags.power_manageable) {
1247                 result = acpi_bus_get_power_flags(device);
1248                 if (result)
1249                         goto end;
1250         }
1251
1252         /*
1253          * Wakeup device management
1254          *-----------------------
1255          */
1256         if (device->flags.wake_capable) {
1257                 result = acpi_bus_get_wakeup_device_flags(device);
1258                 if (result)
1259                         goto end;
1260         }
1261
1262         /*
1263          * Performance Management
1264          * ----------------------
1265          */
1266         if (device->flags.performance_manageable) {
1267                 result = acpi_bus_get_perf_flags(device);
1268                 if (result)
1269                         goto end;
1270         }
1271
1272         if ((result = acpi_device_set_context(device, type)))
1273                 goto end;
1274
1275         result = acpi_device_register(device, parent);
1276
1277         /*
1278          * Bind _ADR-Based Devices when hot add
1279          */
1280         if (device->flags.bus_address) {
1281                 if (device->parent && device->parent->ops.bind)
1282                         device->parent->ops.bind(device);
1283         }
1284
1285       end:
1286         if (!result)
1287                 *child = device;
1288         else {
1289                 kfree(device->pnp.cid_list);
1290                 kfree(device);
1291         }
1292
1293         return result;
1294 }
1295
1296 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1297 {
1298         acpi_status status = AE_OK;
1299         struct acpi_device *parent = NULL;
1300         struct acpi_device *child = NULL;
1301         acpi_handle phandle = NULL;
1302         acpi_handle chandle = NULL;
1303         acpi_object_type type = 0;
1304         u32 level = 1;
1305
1306
1307         if (!start)
1308                 return -EINVAL;
1309
1310         parent = start;
1311         phandle = start->handle;
1312
1313         /*
1314          * Parse through the ACPI namespace, identify all 'devices', and
1315          * create a new 'struct acpi_device' for each.
1316          */
1317         while ((level > 0) && parent) {
1318
1319                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1320                                               chandle, &chandle);
1321
1322                 /*
1323                  * If this scope is exhausted then move our way back up.
1324                  */
1325                 if (ACPI_FAILURE(status)) {
1326                         level--;
1327                         chandle = phandle;
1328                         acpi_get_parent(phandle, &phandle);
1329                         if (parent->parent)
1330                                 parent = parent->parent;
1331                         continue;
1332                 }
1333
1334                 status = acpi_get_type(chandle, &type);
1335                 if (ACPI_FAILURE(status))
1336                         continue;
1337
1338                 /*
1339                  * If this is a scope object then parse it (depth-first).
1340                  */
1341                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1342                         level++;
1343                         phandle = chandle;
1344                         chandle = NULL;
1345                         continue;
1346                 }
1347
1348                 /*
1349                  * We're only interested in objects that we consider 'devices'.
1350                  */
1351                 switch (type) {
1352                 case ACPI_TYPE_DEVICE:
1353                         type = ACPI_BUS_TYPE_DEVICE;
1354                         break;
1355                 case ACPI_TYPE_PROCESSOR:
1356                         type = ACPI_BUS_TYPE_PROCESSOR;
1357                         break;
1358                 case ACPI_TYPE_THERMAL:
1359                         type = ACPI_BUS_TYPE_THERMAL;
1360                         break;
1361                 case ACPI_TYPE_POWER:
1362                         type = ACPI_BUS_TYPE_POWER;
1363                         break;
1364                 default:
1365                         continue;
1366                 }
1367
1368                 if (ops->acpi_op_add)
1369                         status = acpi_add_single_object(&child, parent,
1370                                 chandle, type, ops);
1371                 else
1372                         status = acpi_bus_get_device(chandle, &child);
1373
1374                 if (ACPI_FAILURE(status))
1375                         continue;
1376
1377                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1378                         status = acpi_start_single_object(child);
1379                         if (ACPI_FAILURE(status))
1380                                 continue;
1381                 }
1382
1383                 /*
1384                  * If the device is present, enabled, and functioning then
1385                  * parse its scope (depth-first).  Note that we need to
1386                  * represent absent devices to facilitate PnP notifications
1387                  * -- but only the subtree head (not all of its children,
1388                  * which will be enumerated when the parent is inserted).
1389                  *
1390                  * TBD: Need notifications and other detection mechanisms
1391                  *      in place before we can fully implement this.
1392                  */
1393                 if (child->status.present) {
1394                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1395                                                       NULL, NULL);
1396                         if (ACPI_SUCCESS(status)) {
1397                                 level++;
1398                                 phandle = chandle;
1399                                 chandle = NULL;
1400                                 parent = child;
1401                         }
1402                 }
1403         }
1404
1405         return 0;
1406 }
1407
1408 int
1409 acpi_bus_add(struct acpi_device **child,
1410              struct acpi_device *parent, acpi_handle handle, int type)
1411 {
1412         int result;
1413         struct acpi_bus_ops ops;
1414
1415         memset(&ops, 0, sizeof(ops));
1416         ops.acpi_op_add = 1;
1417
1418         result = acpi_add_single_object(child, parent, handle, type, &ops);
1419         if (!result)
1420                 result = acpi_bus_scan(*child, &ops);
1421
1422         return result;
1423 }
1424
1425 EXPORT_SYMBOL(acpi_bus_add);
1426
1427 int acpi_bus_start(struct acpi_device *device)
1428 {
1429         int result;
1430         struct acpi_bus_ops ops;
1431
1432
1433         if (!device)
1434                 return -EINVAL;
1435
1436         result = acpi_start_single_object(device);
1437         if (!result) {
1438                 memset(&ops, 0, sizeof(ops));
1439                 ops.acpi_op_start = 1;
1440                 result = acpi_bus_scan(device, &ops);
1441         }
1442         return result;
1443 }
1444
1445 EXPORT_SYMBOL(acpi_bus_start);
1446
1447 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1448 {
1449         acpi_status status;
1450         struct acpi_device *parent, *child;
1451         acpi_handle phandle, chandle;
1452         acpi_object_type type;
1453         u32 level = 1;
1454         int err = 0;
1455
1456         parent = start;
1457         phandle = start->handle;
1458         child = chandle = NULL;
1459
1460         while ((level > 0) && parent && (!err)) {
1461                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1462                                               chandle, &chandle);
1463
1464                 /*
1465                  * If this scope is exhausted then move our way back up.
1466                  */
1467                 if (ACPI_FAILURE(status)) {
1468                         level--;
1469                         chandle = phandle;
1470                         acpi_get_parent(phandle, &phandle);
1471                         child = parent;
1472                         parent = parent->parent;
1473
1474                         if (level == 0)
1475                                 err = acpi_bus_remove(child, rmdevice);
1476                         else
1477                                 err = acpi_bus_remove(child, 1);
1478
1479                         continue;
1480                 }
1481
1482                 status = acpi_get_type(chandle, &type);
1483                 if (ACPI_FAILURE(status)) {
1484                         continue;
1485                 }
1486                 /*
1487                  * If there is a device corresponding to chandle then
1488                  * parse it (depth-first).
1489                  */
1490                 if (acpi_bus_get_device(chandle, &child) == 0) {
1491                         level++;
1492                         phandle = chandle;
1493                         chandle = NULL;
1494                         parent = child;
1495                 }
1496                 continue;
1497         }
1498         return err;
1499 }
1500 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1501
1502
1503 static int acpi_bus_scan_fixed(struct acpi_device *root)
1504 {
1505         int result = 0;
1506         struct acpi_device *device = NULL;
1507         struct acpi_bus_ops ops;
1508
1509         if (!root)
1510                 return -ENODEV;
1511
1512         memset(&ops, 0, sizeof(ops));
1513         ops.acpi_op_add = 1;
1514         ops.acpi_op_start = 1;
1515
1516         /*
1517          * Enumerate all fixed-feature devices.
1518          */
1519         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1520                 result = acpi_add_single_object(&device, acpi_root,
1521                                                 NULL,
1522                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1523                                                 &ops);
1524         }
1525
1526         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1527                 result = acpi_add_single_object(&device, acpi_root,
1528                                                 NULL,
1529                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1530                                                 &ops);
1531         }
1532
1533         return result;
1534 }
1535
1536 int __init acpi_boot_ec_enable(void);
1537
1538 static int __init acpi_scan_init(void)
1539 {
1540         int result;
1541         struct acpi_bus_ops ops;
1542
1543
1544         if (acpi_disabled)
1545                 return 0;
1546
1547         memset(&ops, 0, sizeof(ops));
1548         ops.acpi_op_add = 1;
1549         ops.acpi_op_start = 1;
1550
1551         result = bus_register(&acpi_bus_type);
1552         if (result) {
1553                 /* We don't want to quit even if we failed to add suspend/resume */
1554                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1555         }
1556
1557         /*
1558          * Create the root device in the bus's device tree
1559          */
1560         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1561                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1562         if (result)
1563                 goto Done;
1564
1565         /*
1566          * Enumerate devices in the ACPI namespace.
1567          */
1568         result = acpi_bus_scan_fixed(acpi_root);
1569
1570         /* EC region might be needed at bus_scan, so enable it now */
1571         acpi_boot_ec_enable();
1572
1573         if (!result)
1574                 result = acpi_bus_scan(acpi_root, &ops);
1575
1576         if (result)
1577                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1578
1579       Done:
1580         return result;
1581 }
1582
1583 subsys_initcall(acpi_scan_init);