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                    "ACPI_BUS"
  20 #define ACPI_BUS_DRIVER_NAME            "ACPI Bus Driver"
  21 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  22
  23 static LIST_HEAD(acpi_device_list);
  24 DEFINE_SPINLOCK(acpi_device_lock);
  25 LIST_HEAD(acpi_wakeup_device_list);
  26
  27 static int acpi_eject_operation(acpi_handle handle, int lockable)
  28 {
  29         struct acpi_object_list arg_list;
  30         union acpi_object arg;
  31         acpi_status status = AE_OK;
  32
  33         /*
  34          * TBD: evaluate _PS3?
  35          */
  36
  37         if (lockable) {
  38                 arg_list.count = 1;
  39                 arg_list.pointer = &arg;
  40                 arg.type = ACPI_TYPE_INTEGER;
  41                 arg.integer.value = 0;
  42                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
  43         }
  44
  45         arg_list.count = 1;
  46         arg_list.pointer = &arg;
  47         arg.type = ACPI_TYPE_INTEGER;
  48         arg.integer.value = 1;
  49
  50         /*
  51          * TBD: _EJD support.
  52          */
  53
  54         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
  55         if (ACPI_FAILURE(status)) {
  56                 return (-ENODEV);
  57         }
  58
  59         return (0);
  60 }
  61
  62 static ssize_t
  63 acpi_eject_store(struct device *d, struct device_attribute *attr,
  64                 const char *buf, size_t count)
  65 {
  66         int result;
  67         int ret = count;
  68         int islockable;
  69         acpi_status status;
  70         acpi_handle handle;
  71         acpi_object_type type = 0;
  72         struct acpi_device *acpi_device = to_acpi_device(d);
  73
  74         if ((!count) || (buf[0] != '1')) {
  75                 return -EINVAL;
  76         }
  77 #ifndef FORCE_EJECT
  78         if (acpi_device->driver == NULL) {
  79                 ret = -ENODEV;
  80                 goto err;
  81         }
  82 #endif
  83         status = acpi_get_type(acpi_device->handle, &type);
  84         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
  85                 ret = -ENODEV;
  86                 goto err;
  87         }
  88
  89         islockable = acpi_device->flags.lockable;
  90         handle = acpi_device->handle;
  91
  92         result = acpi_bus_trim(acpi_device, 1);
  93
  94         if (!result)
  95                 result = acpi_eject_operation(handle, islockable);
  96
  97         if (result) {
  98                 ret = -EBUSY;
  99         }
 100       err:
 101         return ret;
 102 }
 103
 104 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 105
 106 static void acpi_device_setup_files(struct acpi_device *dev)
 107 {
 108         acpi_status status;
 109         acpi_handle temp;
 110
 111         /*
 112          * If device has _EJ0, 'eject' file is created that is used to trigger
 113          * hot-removal function from userland.
 114          */
 115         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 116         if (ACPI_SUCCESS(status))
 117                 device_create_file(&dev->dev, &dev_attr_eject);
 118 }
 119
 120 static void acpi_device_remove_files(struct acpi_device *dev)
 121 {
 122         acpi_status status;
 123         acpi_handle temp;
 124
 125         /*
 126          * If device has _EJ0, 'eject' file is created that is used to trigger
 127          * hot-removal function from userland.
 128          */
 129         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 130         if (ACPI_SUCCESS(status))
 131                 device_remove_file(&dev->dev, &dev_attr_eject);
 132 }
 133 /* --------------------------------------------------------------------------
 134                         ACPI Bus operations
 135    -------------------------------------------------------------------------- */
 136 static void acpi_device_release(struct device *dev)
 137 {
 138         struct acpi_device *acpi_dev = to_acpi_device(dev);
 139
 140         kfree(acpi_dev->pnp.cid_list);
 141         kfree(acpi_dev);
 142 }
 143
 144 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 145 {
 146         struct acpi_device *acpi_dev = to_acpi_device(dev);
 147         struct acpi_driver *acpi_drv = acpi_dev->driver;
 148
 149         if (acpi_drv && acpi_drv->ops.suspend)
 150                 return acpi_drv->ops.suspend(acpi_dev, state);
 151         return 0;
 152 }
 153
 154 static int acpi_device_resume(struct device *dev)
 155 {
 156         struct acpi_device *acpi_dev = to_acpi_device(dev);
 157         struct acpi_driver *acpi_drv = acpi_dev->driver;
 158
 159         if (acpi_drv && acpi_drv->ops.resume)
 160                 return acpi_drv->ops.resume(acpi_dev);
 161         return 0;
 162 }
 163
 164 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 165 {
 166         struct acpi_device *acpi_dev = to_acpi_device(dev);
 167         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 168
 169         return !acpi_match_ids(acpi_dev, acpi_drv->ids);
 170 }
 171
 172 static int acpi_device_uevent(struct device *dev, char **envp, int num_envp,
 173         char *buffer, int buffer_size)
 174 {
 175         struct acpi_device *acpi_dev = to_acpi_device(dev);
 176         int i = 0, length = 0, ret = 0;
 177
 178         if (acpi_dev->flags.hardware_id)
 179                 ret = add_uevent_var(envp, num_envp, &i,
 180                         buffer, buffer_size, &length,
 181                         "HWID=%s", acpi_dev->pnp.hardware_id);
 182         if (ret)
 183                 return -ENOMEM;
 184         if (acpi_dev->flags.compatible_ids) {
 185                 int j;
 186                 struct acpi_compatible_id_list *cid_list;
 187
 188                 cid_list = acpi_dev->pnp.cid_list;
 189
 190                 for (j = 0; j < cid_list->count; j++) {
 191                         ret = add_uevent_var(envp, num_envp, &i, buffer,
 192                                 buffer_size, &length, "COMPTID=%s",
 193                                 cid_list->id[j].value);
 194                         if (ret)
 195                                 return -ENOMEM;
 196                 }
 197         }
 198
 199         envp[i] = NULL;
 200         return 0;
 201 }
 202
 203 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 204 static int acpi_start_single_object(struct acpi_device *);
 205 static int acpi_device_probe(struct device * dev)
 206 {
 207         struct acpi_device *acpi_dev = to_acpi_device(dev);
 208         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 209         int ret;
 210
 211         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 212         if (!ret) {
 213                 if (acpi_dev->bus_ops.acpi_op_start)
 214                         acpi_start_single_object(acpi_dev);
 215                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 216                         "Found driver [%s] for device [%s]\n",
 217                         acpi_drv->name, acpi_dev->pnp.bus_id));
 218                 get_device(dev);
 219         }
 220         return ret;
 221 }
 222
 223 static int acpi_device_remove(struct device * dev)
 224 {
 225         struct acpi_device *acpi_dev = to_acpi_device(dev);
 226         struct acpi_driver *acpi_drv = acpi_dev->driver;
 227
 228         if (acpi_drv) {
 229                 if (acpi_drv->ops.stop)
 230                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 231                 if (acpi_drv->ops.remove)
 232                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 233         }
 234         acpi_dev->driver = NULL;
 235         acpi_driver_data(dev) = NULL;
 236
 237         put_device(dev);
 238         return 0;
 239 }
 240
 241 static void acpi_device_shutdown(struct device *dev)
 242 {
 243         struct acpi_device *acpi_dev = to_acpi_device(dev);
 244         struct acpi_driver *acpi_drv = acpi_dev->driver;
 245
 246         if (acpi_drv && acpi_drv->ops.shutdown)
 247                 acpi_drv->ops.shutdown(acpi_dev);
 248
 249         return ;
 250 }
 251
 252 static struct bus_type acpi_bus_type = {
 253         .name           = "acpi",
 254         .suspend        = acpi_device_suspend,
 255         .resume         = acpi_device_resume,
 256         .shutdown       = acpi_device_shutdown,
 257         .match          = acpi_bus_match,
 258         .probe          = acpi_device_probe,
 259         .remove         = acpi_device_remove,
 260         .uevent         = acpi_device_uevent,
 261 };
 262
 263 static void acpi_device_register(struct acpi_device *device,
 264                                  struct acpi_device *parent)
 265 {
 266         /*
 267          * Linkage
 268          * -------
 269          * Link this device to its parent and siblings.
 270          */
 271         INIT_LIST_HEAD(&device->children);
 272         INIT_LIST_HEAD(&device->node);
 273         INIT_LIST_HEAD(&device->g_list);
 274         INIT_LIST_HEAD(&device->wakeup_list);
 275
 276         spin_lock(&acpi_device_lock);
 277         if (device->parent) {
 278                 list_add_tail(&device->node, &device->parent->children);
 279                 list_add_tail(&device->g_list, &device->parent->g_list);
 280         } else
 281                 list_add_tail(&device->g_list, &acpi_device_list);
 282         if (device->wakeup.flags.valid)
 283                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 284         spin_unlock(&acpi_device_lock);
 285
 286         if (device->parent)
 287                 device->dev.parent = &parent->dev;
 288         device->dev.bus = &acpi_bus_type;
 289         device_initialize(&device->dev);
 290         sprintf(device->dev.bus_id, "%s", device->pnp.bus_id);
 291         device->dev.release = &acpi_device_release;
 292         device_add(&device->dev);
 293
 294         acpi_device_setup_files(device);
 295         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 296 }
 297
 298 static void acpi_device_unregister(struct acpi_device *device, int type)
 299 {
 300         spin_lock(&acpi_device_lock);
 301         if (device->parent) {
 302                 list_del(&device->node);
 303                 list_del(&device->g_list);
 304         } else
 305                 list_del(&device->g_list);
 306
 307         list_del(&device->wakeup_list);
 308         spin_unlock(&acpi_device_lock);
 309
 310         acpi_detach_data(device->handle, acpi_bus_data_handler);
 311
 312         acpi_device_remove_files(device);
 313         device_unregister(&device->dev);
 314 }
 315
 316 /* --------------------------------------------------------------------------
 317                                  Driver Management
 318    -------------------------------------------------------------------------- */
 319 /**
 320  * acpi_bus_driver_init - add a device to a driver
 321  * @device: the device to add and initialize
 322  * @driver: driver for the device
 323  *
 324  * Used to initialize a device via its device driver.  Called whenever a
 325  * driver is bound to a device.  Invokes the driver's add() ops.
 326  */
 327 static int
 328 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 329 {
 330         int result = 0;
 331
 332
 333         if (!device || !driver)
 334                 return -EINVAL;
 335
 336         if (!driver->ops.add)
 337                 return -ENOSYS;
 338
 339         result = driver->ops.add(device);
 340         if (result) {
 341                 device->driver = NULL;
 342                 acpi_driver_data(device) = NULL;
 343                 return result;
 344         }
 345
 346         device->driver = driver;
 347
 348         /*
 349          * TBD - Configuration Management: Assign resources to device based
 350          * upon possible configuration and currently allocated resources.
 351          */
 352
 353         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 354                           "Driver successfully bound to device\n"));
 355         return 0;
 356 }
 357
 358 static int acpi_start_single_object(struct acpi_device *device)
 359 {
 360         int result = 0;
 361         struct acpi_driver *driver;
 362
 363
 364         if (!(driver = device->driver))
 365                 return 0;
 366
 367         if (driver->ops.start) {
 368                 result = driver->ops.start(device);
 369                 if (result && driver->ops.remove)
 370                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 371         }
 372
 373         return result;
 374 }
 375
 376 /**
 377  * acpi_bus_register_driver - register a driver with the ACPI bus
 378  * @driver: driver being registered
 379  *
 380  * Registers a driver with the ACPI bus.  Searches the namespace for all
 381  * devices that match the driver's criteria and binds.  Returns zero for
 382  * success or a negative error status for failure.
 383  */
 384 int acpi_bus_register_driver(struct acpi_driver *driver)
 385 {
 386         int ret;
 387
 388         if (acpi_disabled)
 389                 return -ENODEV;
 390         driver->drv.name = driver->name;
 391         driver->drv.bus = &acpi_bus_type;
 392         driver->drv.owner = driver->owner;
 393
 394         ret = driver_register(&driver->drv);
 395         return ret;
 396 }
 397
 398 EXPORT_SYMBOL(acpi_bus_register_driver);
 399
 400 /**
 401  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 402  * @driver: driver to unregister
 403  *
 404  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 405  * devices that match the driver's criteria and unbinds.
 406  */
 407 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 408 {
 409         driver_unregister(&driver->drv);
 410 }
 411
 412 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 413
 414 /* --------------------------------------------------------------------------
 415                                  Device Enumeration
 416    -------------------------------------------------------------------------- */
 417 acpi_status
 418 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 419 {
 420         acpi_status status;
 421         acpi_handle tmp;
 422         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 423         union acpi_object *obj;
 424
 425         status = acpi_get_handle(handle, "_EJD", &tmp);
 426         if (ACPI_FAILURE(status))
 427                 return status;
 428
 429         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 430         if (ACPI_SUCCESS(status)) {
 431                 obj = buffer.pointer;
 432                 status = acpi_get_handle(NULL, obj->string.pointer, ejd);
 433                 kfree(buffer.pointer);
 434         }
 435         return status;
 436 }
 437 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 438
 439 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 440 {
 441
 442         /* TBD */
 443
 444         return;
 445 }
 446
 447 int acpi_match_ids(struct acpi_device *device, char *ids)
 448 {
 449         if (device->flags.hardware_id)
 450                 if (strstr(ids, device->pnp.hardware_id))
 451                         return 0;
 452
 453         if (device->flags.compatible_ids) {
 454                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 455                 int i;
 456
 457                 /* compare multiple _CID entries against driver ids */
 458                 for (i = 0; i < cid_list->count; i++) {
 459                         if (strstr(ids, cid_list->id[i].value))
 460                                 return 0;
 461                 }
 462         }
 463         return -ENOENT;
 464 }
 465
 466 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 467 {
 468         device->performance.state = ACPI_STATE_UNKNOWN;
 469         return 0;
 470 }
 471
 472 static acpi_status
 473 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 474                                              union acpi_object *package)
 475 {
 476         int i = 0;
 477         union acpi_object *element = NULL;
 478
 479         if (!device || !package || (package->package.count < 2))
 480                 return AE_BAD_PARAMETER;
 481
 482         element = &(package->package.elements[0]);
 483         if (!element)
 484                 return AE_BAD_PARAMETER;
 485         if (element->type == ACPI_TYPE_PACKAGE) {
 486                 if ((element->package.count < 2) ||
 487                     (element->package.elements[0].type !=
 488                      ACPI_TYPE_LOCAL_REFERENCE)
 489                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 490                         return AE_BAD_DATA;
 491                 device->wakeup.gpe_device =
 492                     element->package.elements[0].reference.handle;
 493                 device->wakeup.gpe_number =
 494                     (u32) element->package.elements[1].integer.value;
 495         } else if (element->type == ACPI_TYPE_INTEGER) {
 496                 device->wakeup.gpe_number = element->integer.value;
 497         } else
 498                 return AE_BAD_DATA;
 499
 500         element = &(package->package.elements[1]);
 501         if (element->type != ACPI_TYPE_INTEGER) {
 502                 return AE_BAD_DATA;
 503         }
 504         device->wakeup.sleep_state = element->integer.value;
 505
 506         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 507                 return AE_NO_MEMORY;
 508         }
 509         device->wakeup.resources.count = package->package.count - 2;
 510         for (i = 0; i < device->wakeup.resources.count; i++) {
 511                 element = &(package->package.elements[i + 2]);
 512                 if (element->type != ACPI_TYPE_ANY) {
 513                         return AE_BAD_DATA;
 514                 }
 515
 516                 device->wakeup.resources.handles[i] = element->reference.handle;
 517         }
 518
 519         return AE_OK;
 520 }
 521
 522 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 523 {
 524         acpi_status status = 0;
 525         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 526         union acpi_object *package = NULL;
 527
 528
 529         /* _PRW */
 530         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 531         if (ACPI_FAILURE(status)) {
 532                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 533                 goto end;
 534         }
 535
 536         package = (union acpi_object *)buffer.pointer;
 537         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 538         if (ACPI_FAILURE(status)) {
 539                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 540                 goto end;
 541         }
 542
 543         kfree(buffer.pointer);
 544
 545         device->wakeup.flags.valid = 1;
 546         /* Power button, Lid switch always enable wakeup */
 547         if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
 548                 device->wakeup.flags.run_wake = 1;
 549
 550       end:
 551         if (ACPI_FAILURE(status))
 552                 device->flags.wake_capable = 0;
 553         return 0;
 554 }
 555
 556 static int acpi_bus_get_power_flags(struct acpi_device *device)
 557 {
 558         acpi_status status = 0;
 559         acpi_handle handle = NULL;
 560         u32 i = 0;
 561
 562
 563         /*
 564          * Power Management Flags
 565          */
 566         status = acpi_get_handle(device->handle, "_PSC", &handle);
 567         if (ACPI_SUCCESS(status))
 568                 device->power.flags.explicit_get = 1;
 569         status = acpi_get_handle(device->handle, "_IRC", &handle);
 570         if (ACPI_SUCCESS(status))
 571                 device->power.flags.inrush_current = 1;
 572
 573         /*
 574          * Enumerate supported power management states
 575          */
 576         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 577                 struct acpi_device_power_state *ps = &device->power.states[i];
 578                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 579
 580                 /* Evaluate "_PRx" to se if power resources are referenced */
 581                 acpi_evaluate_reference(device->handle, object_name, NULL,
 582                                         &ps->resources);
 583                 if (ps->resources.count) {
 584                         device->power.flags.power_resources = 1;
 585                         ps->flags.valid = 1;
 586                 }
 587
 588                 /* Evaluate "_PSx" to see if we can do explicit sets */
 589                 object_name[2] = 'S';
 590                 status = acpi_get_handle(device->handle, object_name, &handle);
 591                 if (ACPI_SUCCESS(status)) {
 592                         ps->flags.explicit_set = 1;
 593                         ps->flags.valid = 1;
 594                 }
 595
 596                 /* State is valid if we have some power control */
 597                 if (ps->resources.count || ps->flags.explicit_set)
 598                         ps->flags.valid = 1;
 599
 600                 ps->power = -1; /* Unknown - driver assigned */
 601                 ps->latency = -1;       /* Unknown - driver assigned */
 602         }
 603
 604         /* Set defaults for D0 and D3 states (always valid) */
 605         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 606         device->power.states[ACPI_STATE_D0].power = 100;
 607         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 608         device->power.states[ACPI_STATE_D3].power = 0;
 609
 610         /* TBD: System wake support and resource requirements. */
 611
 612         device->power.state = ACPI_STATE_UNKNOWN;
 613
 614         return 0;
 615 }
 616
 617 static int acpi_bus_get_flags(struct acpi_device *device)
 618 {
 619         acpi_status status = AE_OK;
 620         acpi_handle temp = NULL;
 621
 622
 623         /* Presence of _STA indicates 'dynamic_status' */
 624         status = acpi_get_handle(device->handle, "_STA", &temp);
 625         if (ACPI_SUCCESS(status))
 626                 device->flags.dynamic_status = 1;
 627
 628         /* Presence of _CID indicates 'compatible_ids' */
 629         status = acpi_get_handle(device->handle, "_CID", &temp);
 630         if (ACPI_SUCCESS(status))
 631                 device->flags.compatible_ids = 1;
 632
 633         /* Presence of _RMV indicates 'removable' */
 634         status = acpi_get_handle(device->handle, "_RMV", &temp);
 635         if (ACPI_SUCCESS(status))
 636                 device->flags.removable = 1;
 637
 638         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 639         status = acpi_get_handle(device->handle, "_EJD", &temp);
 640         if (ACPI_SUCCESS(status))
 641                 device->flags.ejectable = 1;
 642         else {
 643                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 644                 if (ACPI_SUCCESS(status))
 645                         device->flags.ejectable = 1;
 646         }
 647
 648         /* Presence of _LCK indicates 'lockable' */
 649         status = acpi_get_handle(device->handle, "_LCK", &temp);
 650         if (ACPI_SUCCESS(status))
 651                 device->flags.lockable = 1;
 652
 653         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 654         status = acpi_get_handle(device->handle, "_PS0", &temp);
 655         if (ACPI_FAILURE(status))
 656                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 657         if (ACPI_SUCCESS(status))
 658                 device->flags.power_manageable = 1;
 659
 660         /* Presence of _PRW indicates wake capable */
 661         status = acpi_get_handle(device->handle, "_PRW", &temp);
 662         if (ACPI_SUCCESS(status))
 663                 device->flags.wake_capable = 1;
 664
 665         /* TBD: Peformance management */
 666
 667         return 0;
 668 }
 669
 670 static void acpi_device_get_busid(struct acpi_device *device,
 671                                   acpi_handle handle, int type)
 672 {
 673         char bus_id[5] = { '?', 0 };
 674         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 675         int i = 0;
 676
 677         /*
 678          * Bus ID
 679          * ------
 680          * The device's Bus ID is simply the object name.
 681          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 682          */
 683         switch (type) {
 684         case ACPI_BUS_TYPE_SYSTEM:
 685                 strcpy(device->pnp.bus_id, "ACPI");
 686                 break;
 687         case ACPI_BUS_TYPE_POWER_BUTTON:
 688                 strcpy(device->pnp.bus_id, "PWRF");
 689                 break;
 690         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 691                 strcpy(device->pnp.bus_id, "SLPF");
 692                 break;
 693         default:
 694                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 695                 /* Clean up trailing underscores (if any) */
 696                 for (i = 3; i > 1; i--) {
 697                         if (bus_id[i] == '_')
 698                                 bus_id[i] = '\0';
 699                         else
 700                                 break;
 701                 }
 702                 strcpy(device->pnp.bus_id, bus_id);
 703                 break;
 704         }
 705 }
 706
 707 static int
 708 acpi_video_bus_match(struct acpi_device *device)
 709 {
 710         acpi_handle h_dummy1;
 711         acpi_handle h_dummy2;
 712         acpi_handle h_dummy3;
 713
 714
 715         if (!device)
 716                 return -EINVAL;
 717
 718         /* Since there is no HID, CID for ACPI Video drivers, we have
 719          * to check well known required nodes for each feature we support.
 720          */
 721
 722         /* Does this device able to support video switching ? */
 723         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
 724             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
 725                 return 0;
 726
 727         /* Does this device able to retrieve a video ROM ? */
 728         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
 729                 return 0;
 730
 731         /* Does this device able to configure which video head to be POSTed ? */
 732         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
 733             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
 734             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
 735                 return 0;
 736
 737         return -ENODEV;
 738 }
 739
 740 static int acpi_pci_bridge_match(struct acpi_device *device)
 741 {
 742        acpi_status status;
 743        acpi_handle handle;
 744
 745        /* pci bridge has _PRT but isn't PNP0A03 */
 746        status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
 747        if (ACPI_FAILURE(status))
 748                return -ENODEV;
 749        if (!acpi_match_ids(device, "PNP0A03"))
 750                return -ENODEV;
 751        return 0;
 752 }
 753
 754 static void acpi_device_set_id(struct acpi_device *device,
 755                                struct acpi_device *parent, acpi_handle handle,
 756                                int type)
 757 {
 758         struct acpi_device_info *info;
 759         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 760         char *hid = NULL;
 761         char *uid = NULL;
 762         struct acpi_compatible_id_list *cid_list = NULL;
 763         acpi_status status;
 764
 765         switch (type) {
 766         case ACPI_BUS_TYPE_DEVICE:
 767                 status = acpi_get_object_info(handle, &buffer);
 768                 if (ACPI_FAILURE(status)) {
 769                         printk("%s: Error reading device info\n", __FUNCTION__);
 770                         return;
 771                 }
 772
 773                 info = buffer.pointer;
 774                 if (info->valid & ACPI_VALID_HID)
 775                         hid = info->hardware_id.value;
 776                 if (info->valid & ACPI_VALID_UID)
 777                         uid = info->unique_id.value;
 778                 if (info->valid & ACPI_VALID_CID)
 779                         cid_list = &info->compatibility_id;
 780                 if (info->valid & ACPI_VALID_ADR) {
 781                         device->pnp.bus_address = info->address;
 782                         device->flags.bus_address = 1;
 783                 }
 784
 785                 if(!(info->valid & (ACPI_VALID_HID | ACPI_VALID_CID))){
 786                         status = acpi_video_bus_match(device);
 787                         if(ACPI_SUCCESS(status))
 788                                 hid = ACPI_VIDEO_HID;
 789
 790                         status = acpi_pci_bridge_match(device);
 791                         if(ACPI_SUCCESS(status))
 792                                 hid = ACPI_PCI_BRIDGE_HID;
 793                 }
 794                 break;
 795         case ACPI_BUS_TYPE_POWER:
 796                 hid = ACPI_POWER_HID;
 797                 break;
 798         case ACPI_BUS_TYPE_PROCESSOR:
 799                 hid = ACPI_PROCESSOR_HID;
 800                 break;
 801         case ACPI_BUS_TYPE_SYSTEM:
 802                 hid = ACPI_SYSTEM_HID;
 803                 break;
 804         case ACPI_BUS_TYPE_THERMAL:
 805                 hid = ACPI_THERMAL_HID;
 806                 break;
 807         case ACPI_BUS_TYPE_POWER_BUTTON:
 808                 hid = ACPI_BUTTON_HID_POWERF;
 809                 break;
 810         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 811                 hid = ACPI_BUTTON_HID_SLEEPF;
 812                 break;
 813         }
 814
 815         /*
 816          * \_SB
 817          * ----
 818          * Fix for the system root bus device -- the only root-level device.
 819          */
 820         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
 821                 hid = ACPI_BUS_HID;
 822                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
 823                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
 824         }
 825
 826         if (hid) {
 827                 strcpy(device->pnp.hardware_id, hid);
 828                 device->flags.hardware_id = 1;
 829         }
 830         if (uid) {
 831                 strcpy(device->pnp.unique_id, uid);
 832                 device->flags.unique_id = 1;
 833         }
 834         if (cid_list) {
 835                 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
 836                 if (device->pnp.cid_list)
 837                         memcpy(device->pnp.cid_list, cid_list, cid_list->size);
 838                 else
 839                         printk(KERN_ERR "Memory allocation error\n");
 840         }
 841
 842         kfree(buffer.pointer);
 843 }
 844
 845 static int acpi_device_set_context(struct acpi_device *device, int type)
 846 {
 847         acpi_status status = AE_OK;
 848         int result = 0;
 849         /*
 850          * Context
 851          * -------
 852          * Attach this 'struct acpi_device' to the ACPI object.  This makes
 853          * resolutions from handle->device very efficient.  Note that we need
 854          * to be careful with fixed-feature devices as they all attach to the
 855          * root object.
 856          */
 857         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
 858             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
 859                 status = acpi_attach_data(device->handle,
 860                                           acpi_bus_data_handler, device);
 861
 862                 if (ACPI_FAILURE(status)) {
 863                         printk("Error attaching device data\n");
 864                         result = -ENODEV;
 865                 }
 866         }
 867         return result;
 868 }
 869
 870 static void acpi_device_get_debug_info(struct acpi_device *device,
 871                                        acpi_handle handle, int type)
 872 {
 873 #ifdef CONFIG_ACPI_DEBUG_OUTPUT
 874         char *type_string = NULL;
 875         char name[80] = { '?', '\0' };
 876         struct acpi_buffer buffer = { sizeof(name), name };
 877
 878         switch (type) {
 879         case ACPI_BUS_TYPE_DEVICE:
 880                 type_string = "Device";
 881                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
 882                 break;
 883         case ACPI_BUS_TYPE_POWER:
 884                 type_string = "Power Resource";
 885                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
 886                 break;
 887         case ACPI_BUS_TYPE_PROCESSOR:
 888                 type_string = "Processor";
 889                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
 890                 break;
 891         case ACPI_BUS_TYPE_SYSTEM:
 892                 type_string = "System";
 893                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
 894                 break;
 895         case ACPI_BUS_TYPE_THERMAL:
 896                 type_string = "Thermal Zone";
 897                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
 898                 break;
 899         case ACPI_BUS_TYPE_POWER_BUTTON:
 900                 type_string = "Power Button";
 901                 sprintf(name, "PWRB");
 902                 break;
 903         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 904                 type_string = "Sleep Button";
 905                 sprintf(name, "SLPB");
 906                 break;
 907         }
 908
 909         printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
 910 #endif                          /*CONFIG_ACPI_DEBUG_OUTPUT */
 911 }
 912
 913 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
 914 {
 915         if (!dev)
 916                 return -EINVAL;
 917
 918         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
 919         device_release_driver(&dev->dev);
 920
 921         if (!rmdevice)
 922                 return 0;
 923
 924         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
 925
 926         return 0;
 927 }
 928
 929 static int
 930 acpi_add_single_object(struct acpi_device **child,
 931                        struct acpi_device *parent, acpi_handle handle, int type,
 932                         struct acpi_bus_ops *ops)
 933 {
 934         int result = 0;
 935         struct acpi_device *device = NULL;
 936
 937
 938         if (!child)
 939                 return -EINVAL;
 940
 941         device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
 942         if (!device) {
 943                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 944                 return -ENOMEM;
 945         }
 946         memset(device, 0, sizeof(struct acpi_device));
 947
 948         device->handle = handle;
 949         device->parent = parent;
 950         device->bus_ops = *ops; /* workround for not call .start */
 951
 952
 953         acpi_device_get_busid(device, handle, type);
 954
 955         /*
 956          * Flags
 957          * -----
 958          * Get prior to calling acpi_bus_get_status() so we know whether
 959          * or not _STA is present.  Note that we only look for object
 960          * handles -- cannot evaluate objects until we know the device is
 961          * present and properly initialized.
 962          */
 963         result = acpi_bus_get_flags(device);
 964         if (result)
 965                 goto end;
 966
 967         /*
 968          * Status
 969          * ------
 970          * See if the device is present.  We always assume that non-Device
 971          * and non-Processor objects (e.g. thermal zones, power resources,
 972          * etc.) are present, functioning, etc. (at least when parent object
 973          * is present).  Note that _STA has a different meaning for some
 974          * objects (e.g. power resources) so we need to be careful how we use
 975          * it.
 976          */
 977         switch (type) {
 978         case ACPI_BUS_TYPE_PROCESSOR:
 979         case ACPI_BUS_TYPE_DEVICE:
 980                 result = acpi_bus_get_status(device);
 981                 if (ACPI_FAILURE(result) || !device->status.present) {
 982                         result = -ENOENT;
 983                         goto end;
 984                 }
 985                 break;
 986         default:
 987                 STRUCT_TO_INT(device->status) = 0x0F;
 988                 break;
 989         }
 990
 991         /*
 992          * Initialize Device
 993          * -----------------
 994          * TBD: Synch with Core's enumeration/initialization process.
 995          */
 996
 997         /*
 998          * Hardware ID, Unique ID, & Bus Address
 999          * -------------------------------------
1000          */
1001         acpi_device_set_id(device, parent, handle, type);
1002
1003         /*
1004          * Power Management
1005          * ----------------
1006          */
1007         if (device->flags.power_manageable) {
1008                 result = acpi_bus_get_power_flags(device);
1009                 if (result)
1010                         goto end;
1011         }
1012
1013         /*
1014          * Wakeup device management
1015          *-----------------------
1016          */
1017         if (device->flags.wake_capable) {
1018                 result = acpi_bus_get_wakeup_device_flags(device);
1019                 if (result)
1020                         goto end;
1021         }
1022
1023         /*
1024          * Performance Management
1025          * ----------------------
1026          */
1027         if (device->flags.performance_manageable) {
1028                 result = acpi_bus_get_perf_flags(device);
1029                 if (result)
1030                         goto end;
1031         }
1032
1033         if ((result = acpi_device_set_context(device, type)))
1034                 goto end;
1035
1036         acpi_device_get_debug_info(device, handle, type);
1037
1038         acpi_device_register(device, parent);
1039
1040       end:
1041         if (!result)
1042                 *child = device;
1043         else {
1044                 kfree(device->pnp.cid_list);
1045                 kfree(device);
1046         }
1047
1048         return result;
1049 }
1050
1051 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1052 {
1053         acpi_status status = AE_OK;
1054         struct acpi_device *parent = NULL;
1055         struct acpi_device *child = NULL;
1056         acpi_handle phandle = NULL;
1057         acpi_handle chandle = NULL;
1058         acpi_object_type type = 0;
1059         u32 level = 1;
1060
1061
1062         if (!start)
1063                 return -EINVAL;
1064
1065         parent = start;
1066         phandle = start->handle;
1067
1068         /*
1069          * Parse through the ACPI namespace, identify all 'devices', and
1070          * create a new 'struct acpi_device' for each.
1071          */
1072         while ((level > 0) && parent) {
1073
1074                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1075                                               chandle, &chandle);
1076
1077                 /*
1078                  * If this scope is exhausted then move our way back up.
1079                  */
1080                 if (ACPI_FAILURE(status)) {
1081                         level--;
1082                         chandle = phandle;
1083                         acpi_get_parent(phandle, &phandle);
1084                         if (parent->parent)
1085                                 parent = parent->parent;
1086                         continue;
1087                 }
1088
1089                 status = acpi_get_type(chandle, &type);
1090                 if (ACPI_FAILURE(status))
1091                         continue;
1092
1093                 /*
1094                  * If this is a scope object then parse it (depth-first).
1095                  */
1096                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1097                         level++;
1098                         phandle = chandle;
1099                         chandle = NULL;
1100                         continue;
1101                 }
1102
1103                 /*
1104                  * We're only interested in objects that we consider 'devices'.
1105                  */
1106                 switch (type) {
1107                 case ACPI_TYPE_DEVICE:
1108                         type = ACPI_BUS_TYPE_DEVICE;
1109                         break;
1110                 case ACPI_TYPE_PROCESSOR:
1111                         type = ACPI_BUS_TYPE_PROCESSOR;
1112                         break;
1113                 case ACPI_TYPE_THERMAL:
1114                         type = ACPI_BUS_TYPE_THERMAL;
1115                         break;
1116                 case ACPI_TYPE_POWER:
1117                         type = ACPI_BUS_TYPE_POWER;
1118                         break;
1119                 default:
1120                         continue;
1121                 }
1122
1123                 if (ops->acpi_op_add)
1124                         status = acpi_add_single_object(&child, parent,
1125                                 chandle, type, ops);
1126                 else
1127                         status = acpi_bus_get_device(chandle, &child);
1128
1129                 if (ACPI_FAILURE(status))
1130                         continue;
1131
1132                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1133                         status = acpi_start_single_object(child);
1134                         if (ACPI_FAILURE(status))
1135                                 continue;
1136                 }
1137
1138                 /*
1139                  * If the device is present, enabled, and functioning then
1140                  * parse its scope (depth-first).  Note that we need to
1141                  * represent absent devices to facilitate PnP notifications
1142                  * -- but only the subtree head (not all of its children,
1143                  * which will be enumerated when the parent is inserted).
1144                  *
1145                  * TBD: Need notifications and other detection mechanisms
1146                  *      in place before we can fully implement this.
1147                  */
1148                 if (child->status.present) {
1149                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1150                                                       NULL, NULL);
1151                         if (ACPI_SUCCESS(status)) {
1152                                 level++;
1153                                 phandle = chandle;
1154                                 chandle = NULL;
1155                                 parent = child;
1156                         }
1157                 }
1158         }
1159
1160         return 0;
1161 }
1162
1163 int
1164 acpi_bus_add(struct acpi_device **child,
1165              struct acpi_device *parent, acpi_handle handle, int type)
1166 {
1167         int result;
1168         struct acpi_bus_ops ops;
1169
1170         memset(&ops, 0, sizeof(ops));
1171         ops.acpi_op_add = 1;
1172
1173         result = acpi_add_single_object(child, parent, handle, type, &ops);
1174         if (!result)
1175                 result = acpi_bus_scan(*child, &ops);
1176
1177         return result;
1178 }
1179
1180 EXPORT_SYMBOL(acpi_bus_add);
1181
1182 int acpi_bus_start(struct acpi_device *device)
1183 {
1184         int result;
1185         struct acpi_bus_ops ops;
1186
1187
1188         if (!device)
1189                 return -EINVAL;
1190
1191         result = acpi_start_single_object(device);
1192         if (!result) {
1193                 memset(&ops, 0, sizeof(ops));
1194                 ops.acpi_op_start = 1;
1195                 result = acpi_bus_scan(device, &ops);
1196         }
1197         return result;
1198 }
1199
1200 EXPORT_SYMBOL(acpi_bus_start);
1201
1202 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1203 {
1204         acpi_status status;
1205         struct acpi_device *parent, *child;
1206         acpi_handle phandle, chandle;
1207         acpi_object_type type;
1208         u32 level = 1;
1209         int err = 0;
1210
1211         parent = start;
1212         phandle = start->handle;
1213         child = chandle = NULL;
1214
1215         while ((level > 0) && parent && (!err)) {
1216                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1217                                               chandle, &chandle);
1218
1219                 /*
1220                  * If this scope is exhausted then move our way back up.
1221                  */
1222                 if (ACPI_FAILURE(status)) {
1223                         level--;
1224                         chandle = phandle;
1225                         acpi_get_parent(phandle, &phandle);
1226                         child = parent;
1227                         parent = parent->parent;
1228
1229                         if (level == 0)
1230                                 err = acpi_bus_remove(child, rmdevice);
1231                         else
1232                                 err = acpi_bus_remove(child, 1);
1233
1234                         continue;
1235                 }
1236
1237                 status = acpi_get_type(chandle, &type);
1238                 if (ACPI_FAILURE(status)) {
1239                         continue;
1240                 }
1241                 /*
1242                  * If there is a device corresponding to chandle then
1243                  * parse it (depth-first).
1244                  */
1245                 if (acpi_bus_get_device(chandle, &child) == 0) {
1246                         level++;
1247                         phandle = chandle;
1248                         chandle = NULL;
1249                         parent = child;
1250                 }
1251                 continue;
1252         }
1253         return err;
1254 }
1255 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1256
1257
1258 static int acpi_bus_scan_fixed(struct acpi_device *root)
1259 {
1260         int result = 0;
1261         struct acpi_device *device = NULL;
1262         struct acpi_bus_ops ops;
1263
1264         if (!root)
1265                 return -ENODEV;
1266
1267         memset(&ops, 0, sizeof(ops));
1268         ops.acpi_op_add = 1;
1269         ops.acpi_op_start = 1;
1270
1271         /*
1272          * Enumerate all fixed-feature devices.
1273          */
1274         if (acpi_fadt.pwr_button == 0) {
1275                 result = acpi_add_single_object(&device, acpi_root,
1276                                                 NULL,
1277                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1278                                                 &ops);
1279         }
1280
1281         if (acpi_fadt.sleep_button == 0) {
1282                 result = acpi_add_single_object(&device, acpi_root,
1283                                                 NULL,
1284                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1285                                                 &ops);
1286         }
1287
1288         return result;
1289 }
1290
1291 static int __init acpi_scan_init(void)
1292 {
1293         int result;
1294         struct acpi_bus_ops ops;
1295
1296
1297         if (acpi_disabled)
1298                 return 0;
1299
1300         memset(&ops, 0, sizeof(ops));
1301         ops.acpi_op_add = 1;
1302         ops.acpi_op_start = 1;
1303
1304         result = bus_register(&acpi_bus_type);
1305         if (result) {
1306                 /* We don't want to quit even if we failed to add suspend/resume */
1307                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1308         }
1309
1310         /*
1311          * Create the root device in the bus's device tree
1312          */
1313         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1314                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1315         if (result)
1316                 goto Done;
1317
1318         /*
1319          * Enumerate devices in the ACPI namespace.
1320          */
1321         result = acpi_bus_scan_fixed(acpi_root);
1322         if (!result)
1323                 result = acpi_bus_scan(acpi_root, &ops);
1324
1325         if (result)
1326                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1327
1328       Done:
1329         return result;
1330 }
1331
1332 subsys_initcall(acpi_scan_init);