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
  43         if (!acpi_dev->flags.hardware_id)
  44                 return -ENODEV;
  45
  46         len = snprintf(modalias, size, "acpi:%s:",
  47                        acpi_dev->pnp.hardware_id);
  48         if (len < 0 || len >= size)
  49                 return -EINVAL;
  50         size -= len;
  51
  52         if (acpi_dev->flags.compatible_ids) {
  53                 struct acpi_compatible_id_list *cid_list;
  54                 int i;
  55                 int count;
  56
  57                 cid_list = acpi_dev->pnp.cid_list;
  58                 for (i = 0; i < cid_list->count; i++) {
  59                         count = snprintf(&modalias[len], size, "%s:",
  60                                          cid_list->id[i].value);
  61                         if (count < 0 || count >= size) {
  62                                 printk(KERN_ERR "acpi: %s cid[%i] exceeds event buffer size",
  63                                        acpi_dev->pnp.device_name, i);
  64                                 break;
  65                         }
  66                         len += count;
  67                         size -= count;
  68                 }
  69         }
  70
  71         modalias[len] = '\0';
  72         return len;
  73 }
  74
  75 static ssize_t
  76 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  77         struct acpi_device *acpi_dev = to_acpi_device(dev);
  78         int len;
  79
  80         /* Device has no HID and no CID or string is >1024 */
  81         len = create_modalias(acpi_dev, buf, 1024);
  82         if (len <= 0)
  83                 return 0;
  84         buf[len++] = '\n';
  85         return len;
  86 }
  87 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  88
  89 static int acpi_eject_operation(acpi_handle handle, int lockable)
  90 {
  91         struct acpi_object_list arg_list;
  92         union acpi_object arg;
  93         acpi_status status = AE_OK;
  94
  95         /*
  96          * TBD: evaluate _PS3?
  97          */
  98
  99         if (lockable) {
 100                 arg_list.count = 1;
 101                 arg_list.pointer = &arg;
 102                 arg.type = ACPI_TYPE_INTEGER;
 103                 arg.integer.value = 0;
 104                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 105         }
 106
 107         arg_list.count = 1;
 108         arg_list.pointer = &arg;
 109         arg.type = ACPI_TYPE_INTEGER;
 110         arg.integer.value = 1;
 111
 112         /*
 113          * TBD: _EJD support.
 114          */
 115
 116         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 117         if (ACPI_FAILURE(status)) {
 118                 return (-ENODEV);
 119         }
 120
 121         return (0);
 122 }
 123
 124 static ssize_t
 125 acpi_eject_store(struct device *d, struct device_attribute *attr,
 126                 const char *buf, size_t count)
 127 {
 128         int result;
 129         int ret = count;
 130         int islockable;
 131         acpi_status status;
 132         acpi_handle handle;
 133         acpi_object_type type = 0;
 134         struct acpi_device *acpi_device = to_acpi_device(d);
 135
 136         if ((!count) || (buf[0] != '1')) {
 137                 return -EINVAL;
 138         }
 139 #ifndef FORCE_EJECT
 140         if (acpi_device->driver == NULL) {
 141                 ret = -ENODEV;
 142                 goto err;
 143         }
 144 #endif
 145         status = acpi_get_type(acpi_device->handle, &type);
 146         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 147                 ret = -ENODEV;
 148                 goto err;
 149         }
 150
 151         islockable = acpi_device->flags.lockable;
 152         handle = acpi_device->handle;
 153
 154         result = acpi_bus_trim(acpi_device, 1);
 155
 156         if (!result)
 157                 result = acpi_eject_operation(handle, islockable);
 158
 159         if (result) {
 160                 ret = -EBUSY;
 161         }
 162       err:
 163         return ret;
 164 }
 165
 166 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 167
 168 static ssize_t
 169 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 170         struct acpi_device *acpi_dev = to_acpi_device(dev);
 171
 172         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
 173 }
 174 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 175
 176 static ssize_t
 177 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 178         struct acpi_device *acpi_dev = to_acpi_device(dev);
 179         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 180         int result;
 181
 182         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 183         if(result)
 184                 goto end;
 185
 186         result = sprintf(buf, "%s\n", (char*)path.pointer);
 187         kfree(path.pointer);
 188   end:
 189         return result;
 190 }
 191 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 192
 193 static int acpi_device_setup_files(struct acpi_device *dev)
 194 {
 195         acpi_status status;
 196         acpi_handle temp;
 197         int result = 0;
 198
 199         /*
 200          * Devices gotten from FADT don't have a "path" attribute
 201          */
 202         if(dev->handle) {
 203                 result = device_create_file(&dev->dev, &dev_attr_path);
 204                 if(result)
 205                         goto end;
 206         }
 207
 208         if(dev->flags.hardware_id) {
 209                 result = device_create_file(&dev->dev, &dev_attr_hid);
 210                 if(result)
 211                         goto end;
 212         }
 213
 214         if (dev->flags.hardware_id || dev->flags.compatible_ids){
 215                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 216                 if(result)
 217                         goto end;
 218         }
 219
 220         /*
 221          * If device has _EJ0, 'eject' file is created that is used to trigger
 222          * hot-removal function from userland.
 223          */
 224         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 225         if (ACPI_SUCCESS(status))
 226                 result = device_create_file(&dev->dev, &dev_attr_eject);
 227   end:
 228         return result;
 229 }
 230
 231 static void acpi_device_remove_files(struct acpi_device *dev)
 232 {
 233         acpi_status status;
 234         acpi_handle temp;
 235
 236         /*
 237          * If device has _EJ0, 'eject' file is created that is used to trigger
 238          * hot-removal function from userland.
 239          */
 240         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 241         if (ACPI_SUCCESS(status))
 242                 device_remove_file(&dev->dev, &dev_attr_eject);
 243
 244         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 245                 device_remove_file(&dev->dev, &dev_attr_modalias);
 246
 247         if(dev->flags.hardware_id)
 248                 device_remove_file(&dev->dev, &dev_attr_hid);
 249         if(dev->handle)
 250                 device_remove_file(&dev->dev, &dev_attr_path);
 251 }
 252 /* --------------------------------------------------------------------------
 253                         ACPI Bus operations
 254    -------------------------------------------------------------------------- */
 255
 256 int acpi_match_device_ids(struct acpi_device *device,
 257                           const struct acpi_device_id *ids)
 258 {
 259         const struct acpi_device_id *id;
 260
 261         if (device->flags.hardware_id) {
 262                 for (id = ids; id->id[0]; id++) {
 263                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 264                                 return 0;
 265                 }
 266         }
 267
 268         if (device->flags.compatible_ids) {
 269                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 270                 int i;
 271
 272                 for (id = ids; id->id[0]; id++) {
 273                         /* compare multiple _CID entries against driver ids */
 274                         for (i = 0; i < cid_list->count; i++) {
 275                                 if (!strcmp((char*)id->id,
 276                                             cid_list->id[i].value))
 277                                         return 0;
 278                         }
 279                 }
 280         }
 281
 282         return -ENOENT;
 283 }
 284 EXPORT_SYMBOL(acpi_match_device_ids);
 285
 286 static void acpi_device_release(struct device *dev)
 287 {
 288         struct acpi_device *acpi_dev = to_acpi_device(dev);
 289
 290         kfree(acpi_dev->pnp.cid_list);
 291         kfree(acpi_dev);
 292 }
 293
 294 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 295 {
 296         struct acpi_device *acpi_dev = to_acpi_device(dev);
 297         struct acpi_driver *acpi_drv = acpi_dev->driver;
 298
 299         if (acpi_drv && acpi_drv->ops.suspend)
 300                 return acpi_drv->ops.suspend(acpi_dev, state);
 301         return 0;
 302 }
 303
 304 static int acpi_device_resume(struct device *dev)
 305 {
 306         struct acpi_device *acpi_dev = to_acpi_device(dev);
 307         struct acpi_driver *acpi_drv = acpi_dev->driver;
 308
 309         if (acpi_drv && acpi_drv->ops.resume)
 310                 return acpi_drv->ops.resume(acpi_dev);
 311         return 0;
 312 }
 313
 314 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 315 {
 316         struct acpi_device *acpi_dev = to_acpi_device(dev);
 317         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 318
 319         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 320 }
 321
 322 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 323 {
 324         struct acpi_device *acpi_dev = to_acpi_device(dev);
 325         int len;
 326
 327         if (add_uevent_var(env, "MODALIAS="))
 328                 return -ENOMEM;
 329         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 330                               sizeof(env->buf) - env->buflen);
 331         if (len >= (sizeof(env->buf) - env->buflen))
 332                 return -ENOMEM;
 333         env->buflen += len;
 334         return 0;
 335 }
 336
 337 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 338 static int acpi_start_single_object(struct acpi_device *);
 339 static int acpi_device_probe(struct device * dev)
 340 {
 341         struct acpi_device *acpi_dev = to_acpi_device(dev);
 342         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 343         int ret;
 344
 345         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 346         if (!ret) {
 347                 if (acpi_dev->bus_ops.acpi_op_start)
 348                         acpi_start_single_object(acpi_dev);
 349                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 350                         "Found driver [%s] for device [%s]\n",
 351                         acpi_drv->name, acpi_dev->pnp.bus_id));
 352                 get_device(dev);
 353         }
 354         return ret;
 355 }
 356
 357 static int acpi_device_remove(struct device * dev)
 358 {
 359         struct acpi_device *acpi_dev = to_acpi_device(dev);
 360         struct acpi_driver *acpi_drv = acpi_dev->driver;
 361
 362         if (acpi_drv) {
 363                 if (acpi_drv->ops.stop)
 364                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 365                 if (acpi_drv->ops.remove)
 366                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 367         }
 368         acpi_dev->driver = NULL;
 369         acpi_driver_data(dev) = NULL;
 370
 371         put_device(dev);
 372         return 0;
 373 }
 374
 375 static void acpi_device_shutdown(struct device *dev)
 376 {
 377         struct acpi_device *acpi_dev = to_acpi_device(dev);
 378         struct acpi_driver *acpi_drv = acpi_dev->driver;
 379
 380         if (acpi_drv && acpi_drv->ops.shutdown)
 381                 acpi_drv->ops.shutdown(acpi_dev);
 382
 383         return ;
 384 }
 385
 386 struct bus_type acpi_bus_type = {
 387         .name           = "acpi",
 388         .suspend        = acpi_device_suspend,
 389         .resume         = acpi_device_resume,
 390         .shutdown       = acpi_device_shutdown,
 391         .match          = acpi_bus_match,
 392         .probe          = acpi_device_probe,
 393         .remove         = acpi_device_remove,
 394         .uevent         = acpi_device_uevent,
 395 };
 396
 397 static int acpi_device_register(struct acpi_device *device,
 398                                  struct acpi_device *parent)
 399 {
 400         int result;
 401         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 402         int found = 0;
 403         /*
 404          * Linkage
 405          * -------
 406          * Link this device to its parent and siblings.
 407          */
 408         INIT_LIST_HEAD(&device->children);
 409         INIT_LIST_HEAD(&device->node);
 410         INIT_LIST_HEAD(&device->g_list);
 411         INIT_LIST_HEAD(&device->wakeup_list);
 412
 413         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 414         if (!new_bus_id) {
 415                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 416                 return -ENOMEM;
 417         }
 418
 419         spin_lock(&acpi_device_lock);
 420         /*
 421          * Find suitable bus_id and instance number in acpi_bus_id_list
 422          * If failed, create one and link it into acpi_bus_id_list
 423          */
 424         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 425                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 426                         acpi_device_bus_id->instance_no ++;
 427                         found = 1;
 428                         kfree(new_bus_id);
 429                         break;
 430                 }
 431         }
 432         if(!found) {
 433                 acpi_device_bus_id = new_bus_id;
 434                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 435                 acpi_device_bus_id->instance_no = 0;
 436                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 437         }
 438         sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 439
 440         if (device->parent) {
 441                 list_add_tail(&device->node, &device->parent->children);
 442                 list_add_tail(&device->g_list, &device->parent->g_list);
 443         } else
 444                 list_add_tail(&device->g_list, &acpi_device_list);
 445         if (device->wakeup.flags.valid)
 446                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 447         spin_unlock(&acpi_device_lock);
 448
 449         if (device->parent)
 450                 device->dev.parent = &parent->dev;
 451         device->dev.bus = &acpi_bus_type;
 452         device_initialize(&device->dev);
 453         device->dev.release = &acpi_device_release;
 454         result = device_add(&device->dev);
 455         if(result) {
 456                 printk("Error adding device %s", device->dev.bus_id);
 457                 goto end;
 458         }
 459
 460         result = acpi_device_setup_files(device);
 461         if(result)
 462                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
 463
 464         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 465         return 0;
 466   end:
 467         spin_lock(&acpi_device_lock);
 468         if (device->parent) {
 469                 list_del(&device->node);
 470                 list_del(&device->g_list);
 471         } else
 472                 list_del(&device->g_list);
 473         list_del(&device->wakeup_list);
 474         spin_unlock(&acpi_device_lock);
 475         return result;
 476 }
 477
 478 static void acpi_device_unregister(struct acpi_device *device, int type)
 479 {
 480         spin_lock(&acpi_device_lock);
 481         if (device->parent) {
 482                 list_del(&device->node);
 483                 list_del(&device->g_list);
 484         } else
 485                 list_del(&device->g_list);
 486
 487         list_del(&device->wakeup_list);
 488         spin_unlock(&acpi_device_lock);
 489
 490         acpi_detach_data(device->handle, acpi_bus_data_handler);
 491
 492         acpi_device_remove_files(device);
 493         device_unregister(&device->dev);
 494 }
 495
 496 /* --------------------------------------------------------------------------
 497                                  Driver Management
 498    -------------------------------------------------------------------------- */
 499 /**
 500  * acpi_bus_driver_init - add a device to a driver
 501  * @device: the device to add and initialize
 502  * @driver: driver for the device
 503  *
 504  * Used to initialize a device via its device driver.  Called whenever a
 505  * driver is bound to a device.  Invokes the driver's add() ops.
 506  */
 507 static int
 508 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 509 {
 510         int result = 0;
 511
 512
 513         if (!device || !driver)
 514                 return -EINVAL;
 515
 516         if (!driver->ops.add)
 517                 return -ENOSYS;
 518
 519         result = driver->ops.add(device);
 520         if (result) {
 521                 device->driver = NULL;
 522                 acpi_driver_data(device) = NULL;
 523                 return result;
 524         }
 525
 526         device->driver = driver;
 527
 528         /*
 529          * TBD - Configuration Management: Assign resources to device based
 530          * upon possible configuration and currently allocated resources.
 531          */
 532
 533         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 534                           "Driver successfully bound to device\n"));
 535         return 0;
 536 }
 537
 538 static int acpi_start_single_object(struct acpi_device *device)
 539 {
 540         int result = 0;
 541         struct acpi_driver *driver;
 542
 543
 544         if (!(driver = device->driver))
 545                 return 0;
 546
 547         if (driver->ops.start) {
 548                 result = driver->ops.start(device);
 549                 if (result && driver->ops.remove)
 550                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 551         }
 552
 553         return result;
 554 }
 555
 556 /**
 557  * acpi_bus_register_driver - register a driver with the ACPI bus
 558  * @driver: driver being registered
 559  *
 560  * Registers a driver with the ACPI bus.  Searches the namespace for all
 561  * devices that match the driver's criteria and binds.  Returns zero for
 562  * success or a negative error status for failure.
 563  */
 564 int acpi_bus_register_driver(struct acpi_driver *driver)
 565 {
 566         int ret;
 567
 568         if (acpi_disabled)
 569                 return -ENODEV;
 570         driver->drv.name = driver->name;
 571         driver->drv.bus = &acpi_bus_type;
 572         driver->drv.owner = driver->owner;
 573
 574         ret = driver_register(&driver->drv);
 575         return ret;
 576 }
 577
 578 EXPORT_SYMBOL(acpi_bus_register_driver);
 579
 580 /**
 581  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 582  * @driver: driver to unregister
 583  *
 584  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 585  * devices that match the driver's criteria and unbinds.
 586  */
 587 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 588 {
 589         driver_unregister(&driver->drv);
 590 }
 591
 592 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 593
 594 /* --------------------------------------------------------------------------
 595                                  Device Enumeration
 596    -------------------------------------------------------------------------- */
 597 acpi_status
 598 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 599 {
 600         acpi_status status;
 601         acpi_handle tmp;
 602         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 603         union acpi_object *obj;
 604
 605         status = acpi_get_handle(handle, "_EJD", &tmp);
 606         if (ACPI_FAILURE(status))
 607                 return status;
 608
 609         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 610         if (ACPI_SUCCESS(status)) {
 611                 obj = buffer.pointer;
 612                 status = acpi_get_handle(NULL, obj->string.pointer, ejd);
 613                 kfree(buffer.pointer);
 614         }
 615         return status;
 616 }
 617 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 618
 619 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 620 {
 621
 622         /* TBD */
 623
 624         return;
 625 }
 626
 627 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 628 {
 629         device->performance.state = ACPI_STATE_UNKNOWN;
 630         return 0;
 631 }
 632
 633 static acpi_status
 634 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 635                                              union acpi_object *package)
 636 {
 637         int i = 0;
 638         union acpi_object *element = NULL;
 639
 640         if (!device || !package || (package->package.count < 2))
 641                 return AE_BAD_PARAMETER;
 642
 643         element = &(package->package.elements[0]);
 644         if (!element)
 645                 return AE_BAD_PARAMETER;
 646         if (element->type == ACPI_TYPE_PACKAGE) {
 647                 if ((element->package.count < 2) ||
 648                     (element->package.elements[0].type !=
 649                      ACPI_TYPE_LOCAL_REFERENCE)
 650                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 651                         return AE_BAD_DATA;
 652                 device->wakeup.gpe_device =
 653                     element->package.elements[0].reference.handle;
 654                 device->wakeup.gpe_number =
 655                     (u32) element->package.elements[1].integer.value;
 656         } else if (element->type == ACPI_TYPE_INTEGER) {
 657                 device->wakeup.gpe_number = element->integer.value;
 658         } else
 659                 return AE_BAD_DATA;
 660
 661         element = &(package->package.elements[1]);
 662         if (element->type != ACPI_TYPE_INTEGER) {
 663                 return AE_BAD_DATA;
 664         }
 665         device->wakeup.sleep_state = element->integer.value;
 666
 667         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 668                 return AE_NO_MEMORY;
 669         }
 670         device->wakeup.resources.count = package->package.count - 2;
 671         for (i = 0; i < device->wakeup.resources.count; i++) {
 672                 element = &(package->package.elements[i + 2]);
 673                 if (element->type != ACPI_TYPE_ANY) {
 674                         return AE_BAD_DATA;
 675                 }
 676
 677                 device->wakeup.resources.handles[i] = element->reference.handle;
 678         }
 679
 680         return AE_OK;
 681 }
 682
 683 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 684 {
 685         acpi_status status = 0;
 686         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 687         union acpi_object *package = NULL;
 688
 689         struct acpi_device_id button_device_ids[] = {
 690                 {"PNP0C0D", 0},
 691                 {"PNP0C0C", 0},
 692                 {"PNP0C0E", 0},
 693                 {"", 0},
 694         };
 695
 696
 697         /* _PRW */
 698         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 699         if (ACPI_FAILURE(status)) {
 700                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 701                 goto end;
 702         }
 703
 704         package = (union acpi_object *)buffer.pointer;
 705         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 706         if (ACPI_FAILURE(status)) {
 707                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 708                 goto end;
 709         }
 710
 711         kfree(buffer.pointer);
 712
 713         device->wakeup.flags.valid = 1;
 714         /* Power button, Lid switch always enable wakeup */
 715         if (!acpi_match_device_ids(device, button_device_ids))
 716                 device->wakeup.flags.run_wake = 1;
 717
 718       end:
 719         if (ACPI_FAILURE(status))
 720                 device->flags.wake_capable = 0;
 721         return 0;
 722 }
 723
 724 static int acpi_bus_get_power_flags(struct acpi_device *device)
 725 {
 726         acpi_status status = 0;
 727         acpi_handle handle = NULL;
 728         u32 i = 0;
 729
 730
 731         /*
 732          * Power Management Flags
 733          */
 734         status = acpi_get_handle(device->handle, "_PSC", &handle);
 735         if (ACPI_SUCCESS(status))
 736                 device->power.flags.explicit_get = 1;
 737         status = acpi_get_handle(device->handle, "_IRC", &handle);
 738         if (ACPI_SUCCESS(status))
 739                 device->power.flags.inrush_current = 1;
 740
 741         /*
 742          * Enumerate supported power management states
 743          */
 744         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 745                 struct acpi_device_power_state *ps = &device->power.states[i];
 746                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 747
 748                 /* Evaluate "_PRx" to se if power resources are referenced */
 749                 acpi_evaluate_reference(device->handle, object_name, NULL,
 750                                         &ps->resources);
 751                 if (ps->resources.count) {
 752                         device->power.flags.power_resources = 1;
 753                         ps->flags.valid = 1;
 754                 }
 755
 756                 /* Evaluate "_PSx" to see if we can do explicit sets */
 757                 object_name[2] = 'S';
 758                 status = acpi_get_handle(device->handle, object_name, &handle);
 759                 if (ACPI_SUCCESS(status)) {
 760                         ps->flags.explicit_set = 1;
 761                         ps->flags.valid = 1;
 762                 }
 763
 764                 /* State is valid if we have some power control */
 765                 if (ps->resources.count || ps->flags.explicit_set)
 766                         ps->flags.valid = 1;
 767
 768                 ps->power = -1; /* Unknown - driver assigned */
 769                 ps->latency = -1;       /* Unknown - driver assigned */
 770         }
 771
 772         /* Set defaults for D0 and D3 states (always valid) */
 773         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 774         device->power.states[ACPI_STATE_D0].power = 100;
 775         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 776         device->power.states[ACPI_STATE_D3].power = 0;
 777
 778         /* TBD: System wake support and resource requirements. */
 779
 780         device->power.state = ACPI_STATE_UNKNOWN;
 781
 782         return 0;
 783 }
 784
 785 static int acpi_bus_get_flags(struct acpi_device *device)
 786 {
 787         acpi_status status = AE_OK;
 788         acpi_handle temp = NULL;
 789
 790
 791         /* Presence of _STA indicates 'dynamic_status' */
 792         status = acpi_get_handle(device->handle, "_STA", &temp);
 793         if (ACPI_SUCCESS(status))
 794                 device->flags.dynamic_status = 1;
 795
 796         /* Presence of _CID indicates 'compatible_ids' */
 797         status = acpi_get_handle(device->handle, "_CID", &temp);
 798         if (ACPI_SUCCESS(status))
 799                 device->flags.compatible_ids = 1;
 800
 801         /* Presence of _RMV indicates 'removable' */
 802         status = acpi_get_handle(device->handle, "_RMV", &temp);
 803         if (ACPI_SUCCESS(status))
 804                 device->flags.removable = 1;
 805
 806         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 807         status = acpi_get_handle(device->handle, "_EJD", &temp);
 808         if (ACPI_SUCCESS(status))
 809                 device->flags.ejectable = 1;
 810         else {
 811                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 812                 if (ACPI_SUCCESS(status))
 813                         device->flags.ejectable = 1;
 814         }
 815
 816         /* Presence of _LCK indicates 'lockable' */
 817         status = acpi_get_handle(device->handle, "_LCK", &temp);
 818         if (ACPI_SUCCESS(status))
 819                 device->flags.lockable = 1;
 820
 821         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 822         status = acpi_get_handle(device->handle, "_PS0", &temp);
 823         if (ACPI_FAILURE(status))
 824                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 825         if (ACPI_SUCCESS(status))
 826                 device->flags.power_manageable = 1;
 827
 828         /* Presence of _PRW indicates wake capable */
 829         status = acpi_get_handle(device->handle, "_PRW", &temp);
 830         if (ACPI_SUCCESS(status))
 831                 device->flags.wake_capable = 1;
 832
 833         /* TBD: Peformance management */
 834
 835         return 0;
 836 }
 837
 838 static void acpi_device_get_busid(struct acpi_device *device,
 839                                   acpi_handle handle, int type)
 840 {
 841         char bus_id[5] = { '?', 0 };
 842         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 843         int i = 0;
 844
 845         /*
 846          * Bus ID
 847          * ------
 848          * The device's Bus ID is simply the object name.
 849          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 850          */
 851         switch (type) {
 852         case ACPI_BUS_TYPE_SYSTEM:
 853                 strcpy(device->pnp.bus_id, "ACPI");
 854                 break;
 855         case ACPI_BUS_TYPE_POWER_BUTTON:
 856                 strcpy(device->pnp.bus_id, "PWRF");
 857                 break;
 858         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 859                 strcpy(device->pnp.bus_id, "SLPF");
 860                 break;
 861         default:
 862                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 863                 /* Clean up trailing underscores (if any) */
 864                 for (i = 3; i > 1; i--) {
 865                         if (bus_id[i] == '_')
 866                                 bus_id[i] = '\0';
 867                         else
 868                                 break;
 869                 }
 870                 strcpy(device->pnp.bus_id, bus_id);
 871                 break;
 872         }
 873 }
 874
 875 static int
 876 acpi_video_bus_match(struct acpi_device *device)
 877 {
 878         acpi_handle h_dummy1;
 879         acpi_handle h_dummy2;
 880         acpi_handle h_dummy3;
 881
 882
 883         if (!device)
 884                 return -EINVAL;
 885
 886         /* Since there is no HID, CID for ACPI Video drivers, we have
 887          * to check well known required nodes for each feature we support.
 888          */
 889
 890         /* Does this device able to support video switching ? */
 891         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
 892             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
 893                 return 0;
 894
 895         /* Does this device able to retrieve a video ROM ? */
 896         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
 897                 return 0;
 898
 899         /* Does this device able to configure which video head to be POSTed ? */
 900         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
 901             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
 902             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
 903                 return 0;
 904
 905         return -ENODEV;
 906 }
 907
 908 /*
 909  * acpi_bay_match - see if a device is an ejectable driver bay
 910  *
 911  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 912  * then we can safely call it an ejectable drive bay
 913  */
 914 static int acpi_bay_match(struct acpi_device *device){
 915         acpi_status status;
 916         acpi_handle handle;
 917         acpi_handle tmp;
 918         acpi_handle phandle;
 919
 920         handle = device->handle;
 921
 922         status = acpi_get_handle(handle, "_EJ0", &tmp);
 923         if (ACPI_FAILURE(status))
 924                 return -ENODEV;
 925
 926         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 927                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 928                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 929                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 930                 return 0;
 931
 932         if (acpi_get_parent(handle, &phandle))
 933                 return -ENODEV;
 934
 935         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 936                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 937                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 938                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 939                 return 0;
 940
 941         return -ENODEV;
 942 }
 943
 944 static void acpi_device_set_id(struct acpi_device *device,
 945                                struct acpi_device *parent, acpi_handle handle,
 946                                int type)
 947 {
 948         struct acpi_device_info *info;
 949         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 950         char *hid = NULL;
 951         char *uid = NULL;
 952         struct acpi_compatible_id_list *cid_list = NULL;
 953         acpi_status status;
 954
 955         switch (type) {
 956         case ACPI_BUS_TYPE_DEVICE:
 957                 status = acpi_get_object_info(handle, &buffer);
 958                 if (ACPI_FAILURE(status)) {
 959                         printk("%s: Error reading device info\n", __FUNCTION__);
 960                         return;
 961                 }
 962
 963                 info = buffer.pointer;
 964                 if (info->valid & ACPI_VALID_HID)
 965                         hid = info->hardware_id.value;
 966                 if (info->valid & ACPI_VALID_UID)
 967                         uid = info->unique_id.value;
 968                 if (info->valid & ACPI_VALID_CID)
 969                         cid_list = &info->compatibility_id;
 970                 if (info->valid & ACPI_VALID_ADR) {
 971                         device->pnp.bus_address = info->address;
 972                         device->flags.bus_address = 1;
 973                 }
 974
 975                 if(!(info->valid & (ACPI_VALID_HID | ACPI_VALID_CID))){
 976                         status = acpi_video_bus_match(device);
 977                         if(ACPI_SUCCESS(status))
 978                                 hid = ACPI_VIDEO_HID;
 979
 980                         status = acpi_bay_match(device);
 981                         if (ACPI_SUCCESS(status))
 982                                 hid = ACPI_BAY_HID;
 983                 }
 984                 break;
 985         case ACPI_BUS_TYPE_POWER:
 986                 hid = ACPI_POWER_HID;
 987                 break;
 988         case ACPI_BUS_TYPE_PROCESSOR:
 989                 hid = ACPI_PROCESSOR_HID;
 990                 break;
 991         case ACPI_BUS_TYPE_SYSTEM:
 992                 hid = ACPI_SYSTEM_HID;
 993                 break;
 994         case ACPI_BUS_TYPE_THERMAL:
 995                 hid = ACPI_THERMAL_HID;
 996                 break;
 997         case ACPI_BUS_TYPE_POWER_BUTTON:
 998                 hid = ACPI_BUTTON_HID_POWERF;
 999                 break;
1000         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1001                 hid = ACPI_BUTTON_HID_SLEEPF;
1002                 break;
1003         }
1004
1005         /*
1006          * \_SB
1007          * ----
1008          * Fix for the system root bus device -- the only root-level device.
1009          */
1010         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1011                 hid = ACPI_BUS_HID;
1012                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1013                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1014         }
1015
1016         if (hid) {
1017                 strcpy(device->pnp.hardware_id, hid);
1018                 device->flags.hardware_id = 1;
1019         }
1020         if (uid) {
1021                 strcpy(device->pnp.unique_id, uid);
1022                 device->flags.unique_id = 1;
1023         }
1024         if (cid_list) {
1025                 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
1026                 if (device->pnp.cid_list)
1027                         memcpy(device->pnp.cid_list, cid_list, cid_list->size);
1028                 else
1029                         printk(KERN_ERR "Memory allocation error\n");
1030         }
1031
1032         kfree(buffer.pointer);
1033 }
1034
1035 static int acpi_device_set_context(struct acpi_device *device, int type)
1036 {
1037         acpi_status status = AE_OK;
1038         int result = 0;
1039         /*
1040          * Context
1041          * -------
1042          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1043          * resolutions from handle->device very efficient.  Note that we need
1044          * to be careful with fixed-feature devices as they all attach to the
1045          * root object.
1046          */
1047         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1048             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1049                 status = acpi_attach_data(device->handle,
1050                                           acpi_bus_data_handler, device);
1051
1052                 if (ACPI_FAILURE(status)) {
1053                         printk("Error attaching device data\n");
1054                         result = -ENODEV;
1055                 }
1056         }
1057         return result;
1058 }
1059
1060 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1061 {
1062         if (!dev)
1063                 return -EINVAL;
1064
1065         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1066         device_release_driver(&dev->dev);
1067
1068         if (!rmdevice)
1069                 return 0;
1070
1071         /*
1072          * unbind _ADR-Based Devices when hot removal
1073          */
1074         if (dev->flags.bus_address) {
1075                 if ((dev->parent) && (dev->parent->ops.unbind))
1076                         dev->parent->ops.unbind(dev);
1077         }
1078         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1079
1080         return 0;
1081 }
1082
1083 static int
1084 acpi_add_single_object(struct acpi_device **child,
1085                        struct acpi_device *parent, acpi_handle handle, int type,
1086                         struct acpi_bus_ops *ops)
1087 {
1088         int result = 0;
1089         struct acpi_device *device = NULL;
1090
1091
1092         if (!child)
1093                 return -EINVAL;
1094
1095         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1096         if (!device) {
1097                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1098                 return -ENOMEM;
1099         }
1100
1101         device->handle = handle;
1102         device->parent = parent;
1103         device->bus_ops = *ops; /* workround for not call .start */
1104
1105
1106         acpi_device_get_busid(device, handle, type);
1107
1108         /*
1109          * Flags
1110          * -----
1111          * Get prior to calling acpi_bus_get_status() so we know whether
1112          * or not _STA is present.  Note that we only look for object
1113          * handles -- cannot evaluate objects until we know the device is
1114          * present and properly initialized.
1115          */
1116         result = acpi_bus_get_flags(device);
1117         if (result)
1118                 goto end;
1119
1120         /*
1121          * Status
1122          * ------
1123          * See if the device is present.  We always assume that non-Device
1124          * and non-Processor objects (e.g. thermal zones, power resources,
1125          * etc.) are present, functioning, etc. (at least when parent object
1126          * is present).  Note that _STA has a different meaning for some
1127          * objects (e.g. power resources) so we need to be careful how we use
1128          * it.
1129          */
1130         switch (type) {
1131         case ACPI_BUS_TYPE_PROCESSOR:
1132         case ACPI_BUS_TYPE_DEVICE:
1133                 result = acpi_bus_get_status(device);
1134                 if (ACPI_FAILURE(result) || !device->status.present) {
1135                         result = -ENOENT;
1136                         goto end;
1137                 }
1138                 break;
1139         default:
1140                 STRUCT_TO_INT(device->status) =
1141                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1142                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1143                 break;
1144         }
1145
1146         /*
1147          * Initialize Device
1148          * -----------------
1149          * TBD: Synch with Core's enumeration/initialization process.
1150          */
1151
1152         /*
1153          * Hardware ID, Unique ID, & Bus Address
1154          * -------------------------------------
1155          */
1156         acpi_device_set_id(device, parent, handle, type);
1157
1158         /*
1159          * Power Management
1160          * ----------------
1161          */
1162         if (device->flags.power_manageable) {
1163                 result = acpi_bus_get_power_flags(device);
1164                 if (result)
1165                         goto end;
1166         }
1167
1168         /*
1169          * Wakeup device management
1170          *-----------------------
1171          */
1172         if (device->flags.wake_capable) {
1173                 result = acpi_bus_get_wakeup_device_flags(device);
1174                 if (result)
1175                         goto end;
1176         }
1177
1178         /*
1179          * Performance Management
1180          * ----------------------
1181          */
1182         if (device->flags.performance_manageable) {
1183                 result = acpi_bus_get_perf_flags(device);
1184                 if (result)
1185                         goto end;
1186         }
1187
1188         if ((result = acpi_device_set_context(device, type)))
1189                 goto end;
1190
1191         result = acpi_device_register(device, parent);
1192
1193         /*
1194          * Bind _ADR-Based Devices when hot add
1195          */
1196         if (device->flags.bus_address) {
1197                 if (device->parent && device->parent->ops.bind)
1198                         device->parent->ops.bind(device);
1199         }
1200
1201       end:
1202         if (!result)
1203                 *child = device;
1204         else {
1205                 kfree(device->pnp.cid_list);
1206                 kfree(device);
1207         }
1208
1209         return result;
1210 }
1211
1212 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1213 {
1214         acpi_status status = AE_OK;
1215         struct acpi_device *parent = NULL;
1216         struct acpi_device *child = NULL;
1217         acpi_handle phandle = NULL;
1218         acpi_handle chandle = NULL;
1219         acpi_object_type type = 0;
1220         u32 level = 1;
1221
1222
1223         if (!start)
1224                 return -EINVAL;
1225
1226         parent = start;
1227         phandle = start->handle;
1228
1229         /*
1230          * Parse through the ACPI namespace, identify all 'devices', and
1231          * create a new 'struct acpi_device' for each.
1232          */
1233         while ((level > 0) && parent) {
1234
1235                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1236                                               chandle, &chandle);
1237
1238                 /*
1239                  * If this scope is exhausted then move our way back up.
1240                  */
1241                 if (ACPI_FAILURE(status)) {
1242                         level--;
1243                         chandle = phandle;
1244                         acpi_get_parent(phandle, &phandle);
1245                         if (parent->parent)
1246                                 parent = parent->parent;
1247                         continue;
1248                 }
1249
1250                 status = acpi_get_type(chandle, &type);
1251                 if (ACPI_FAILURE(status))
1252                         continue;
1253
1254                 /*
1255                  * If this is a scope object then parse it (depth-first).
1256                  */
1257                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1258                         level++;
1259                         phandle = chandle;
1260                         chandle = NULL;
1261                         continue;
1262                 }
1263
1264                 /*
1265                  * We're only interested in objects that we consider 'devices'.
1266                  */
1267                 switch (type) {
1268                 case ACPI_TYPE_DEVICE:
1269                         type = ACPI_BUS_TYPE_DEVICE;
1270                         break;
1271                 case ACPI_TYPE_PROCESSOR:
1272                         type = ACPI_BUS_TYPE_PROCESSOR;
1273                         break;
1274                 case ACPI_TYPE_THERMAL:
1275                         type = ACPI_BUS_TYPE_THERMAL;
1276                         break;
1277                 case ACPI_TYPE_POWER:
1278                         type = ACPI_BUS_TYPE_POWER;
1279                         break;
1280                 default:
1281                         continue;
1282                 }
1283
1284                 if (ops->acpi_op_add)
1285                         status = acpi_add_single_object(&child, parent,
1286                                 chandle, type, ops);
1287                 else
1288                         status = acpi_bus_get_device(chandle, &child);
1289
1290                 if (ACPI_FAILURE(status))
1291                         continue;
1292
1293                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1294                         status = acpi_start_single_object(child);
1295                         if (ACPI_FAILURE(status))
1296                                 continue;
1297                 }
1298
1299                 /*
1300                  * If the device is present, enabled, and functioning then
1301                  * parse its scope (depth-first).  Note that we need to
1302                  * represent absent devices to facilitate PnP notifications
1303                  * -- but only the subtree head (not all of its children,
1304                  * which will be enumerated when the parent is inserted).
1305                  *
1306                  * TBD: Need notifications and other detection mechanisms
1307                  *      in place before we can fully implement this.
1308                  */
1309                 if (child->status.present) {
1310                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1311                                                       NULL, NULL);
1312                         if (ACPI_SUCCESS(status)) {
1313                                 level++;
1314                                 phandle = chandle;
1315                                 chandle = NULL;
1316                                 parent = child;
1317                         }
1318                 }
1319         }
1320
1321         return 0;
1322 }
1323
1324 int
1325 acpi_bus_add(struct acpi_device **child,
1326              struct acpi_device *parent, acpi_handle handle, int type)
1327 {
1328         int result;
1329         struct acpi_bus_ops ops;
1330
1331         memset(&ops, 0, sizeof(ops));
1332         ops.acpi_op_add = 1;
1333
1334         result = acpi_add_single_object(child, parent, handle, type, &ops);
1335         if (!result)
1336                 result = acpi_bus_scan(*child, &ops);
1337
1338         return result;
1339 }
1340
1341 EXPORT_SYMBOL(acpi_bus_add);
1342
1343 int acpi_bus_start(struct acpi_device *device)
1344 {
1345         int result;
1346         struct acpi_bus_ops ops;
1347
1348
1349         if (!device)
1350                 return -EINVAL;
1351
1352         result = acpi_start_single_object(device);
1353         if (!result) {
1354                 memset(&ops, 0, sizeof(ops));
1355                 ops.acpi_op_start = 1;
1356                 result = acpi_bus_scan(device, &ops);
1357         }
1358         return result;
1359 }
1360
1361 EXPORT_SYMBOL(acpi_bus_start);
1362
1363 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1364 {
1365         acpi_status status;
1366         struct acpi_device *parent, *child;
1367         acpi_handle phandle, chandle;
1368         acpi_object_type type;
1369         u32 level = 1;
1370         int err = 0;
1371
1372         parent = start;
1373         phandle = start->handle;
1374         child = chandle = NULL;
1375
1376         while ((level > 0) && parent && (!err)) {
1377                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1378                                               chandle, &chandle);
1379
1380                 /*
1381                  * If this scope is exhausted then move our way back up.
1382                  */
1383                 if (ACPI_FAILURE(status)) {
1384                         level--;
1385                         chandle = phandle;
1386                         acpi_get_parent(phandle, &phandle);
1387                         child = parent;
1388                         parent = parent->parent;
1389
1390                         if (level == 0)
1391                                 err = acpi_bus_remove(child, rmdevice);
1392                         else
1393                                 err = acpi_bus_remove(child, 1);
1394
1395                         continue;
1396                 }
1397
1398                 status = acpi_get_type(chandle, &type);
1399                 if (ACPI_FAILURE(status)) {
1400                         continue;
1401                 }
1402                 /*
1403                  * If there is a device corresponding to chandle then
1404                  * parse it (depth-first).
1405                  */
1406                 if (acpi_bus_get_device(chandle, &child) == 0) {
1407                         level++;
1408                         phandle = chandle;
1409                         chandle = NULL;
1410                         parent = child;
1411                 }
1412                 continue;
1413         }
1414         return err;
1415 }
1416 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1417
1418
1419 static int acpi_bus_scan_fixed(struct acpi_device *root)
1420 {
1421         int result = 0;
1422         struct acpi_device *device = NULL;
1423         struct acpi_bus_ops ops;
1424
1425         if (!root)
1426                 return -ENODEV;
1427
1428         memset(&ops, 0, sizeof(ops));
1429         ops.acpi_op_add = 1;
1430         ops.acpi_op_start = 1;
1431
1432         /*
1433          * Enumerate all fixed-feature devices.
1434          */
1435         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1436                 result = acpi_add_single_object(&device, acpi_root,
1437                                                 NULL,
1438                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1439                                                 &ops);
1440         }
1441
1442         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1443                 result = acpi_add_single_object(&device, acpi_root,
1444                                                 NULL,
1445                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1446                                                 &ops);
1447         }
1448
1449         return result;
1450 }
1451
1452 int __init acpi_boot_ec_enable(void);
1453
1454 static int __init acpi_scan_init(void)
1455 {
1456         int result;
1457         struct acpi_bus_ops ops;
1458
1459
1460         if (acpi_disabled)
1461                 return 0;
1462
1463         memset(&ops, 0, sizeof(ops));
1464         ops.acpi_op_add = 1;
1465         ops.acpi_op_start = 1;
1466
1467         result = bus_register(&acpi_bus_type);
1468         if (result) {
1469                 /* We don't want to quit even if we failed to add suspend/resume */
1470                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1471         }
1472
1473         /*
1474          * Create the root device in the bus's device tree
1475          */
1476         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1477                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1478         if (result)
1479                 goto Done;
1480
1481         /*
1482          * Enumerate devices in the ACPI namespace.
1483          */
1484         result = acpi_bus_scan_fixed(acpi_root);
1485
1486         /* EC region might be needed at bus_scan, so enable it now */
1487         acpi_boot_ec_enable();
1488
1489         if (!result)
1490                 result = acpi_bus_scan(acpi_root, &ops);
1491
1492         if (result)
1493                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1494
1495       Done:
1496         return result;
1497 }
1498
1499 subsys_initcall(acpi_scan_init);