drivers/acpi/scan.c

   1 /*
   2  * scan.c - support for transforming the ACPI namespace into individual objects
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/init.h>
   7 #include <linux/kernel.h>
   8 #include <linux/acpi.h>
   9 #include <linux/signal.h>
  10 #include <linux/kthread.h>
  11
  12 #include <acpi/acpi_drivers.h>
  13 #include <acpi/acinterp.h>      /* for acpi_ex_eisa_id_to_string() */
  14
  15 #define _COMPONENT              ACPI_BUS_COMPONENT
  16 ACPI_MODULE_NAME("scan");
  17 #define STRUCT_TO_INT(s)        (*((int*)&s))
  18 extern struct acpi_device *acpi_root;
  19
  20 #define ACPI_BUS_CLASS                  "system_bus"
  21 #define ACPI_BUS_HID                    "LNXSYBUS"
  22 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  23
  24 static LIST_HEAD(acpi_device_list);
  25 static LIST_HEAD(acpi_bus_id_list);
  26 DEFINE_SPINLOCK(acpi_device_lock);
  27 LIST_HEAD(acpi_wakeup_device_list);
  28
  29 struct acpi_device_bus_id{
  30         char bus_id[15];
  31         unsigned int instance_no;
  32         struct list_head node;
  33 };
  34
  35 /*
  36  * Creates hid/cid(s) string needed for modalias and uevent
  37  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  38  * char *modalias: "acpi:IBM0001:ACPI0001"
  39 */
  40 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  41                            int size)
  42 {
  43         int len;
  44         int count;
  45
  46         if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
  47                 return -ENODEV;
  48
  49         len = snprintf(modalias, size, "acpi:");
  50         size -= len;
  51
  52         if (acpi_dev->flags.hardware_id) {
  53                 count = snprintf(&modalias[len], size, "%s:",
  54                                  acpi_dev->pnp.hardware_id);
  55                 if (count < 0 || count >= size)
  56                         return -EINVAL;
  57                 len += count;
  58                 size -= count;
  59         }
  60
  61         if (acpi_dev->flags.compatible_ids) {
  62                 struct acpi_compatible_id_list *cid_list;
  63                 int i;
  64
  65                 cid_list = acpi_dev->pnp.cid_list;
  66                 for (i = 0; i < cid_list->count; i++) {
  67                         count = snprintf(&modalias[len], size, "%s:",
  68                                          cid_list->id[i].value);
  69                         if (count < 0 || count >= size) {
  70                                 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
  71                                        acpi_dev->pnp.device_name, i);
  72                                 break;
  73                         }
  74                         len += count;
  75                         size -= count;
  76                 }
  77         }
  78
  79         modalias[len] = '\0';
  80         return len;
  81 }
  82
  83 static ssize_t
  84 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  85         struct acpi_device *acpi_dev = to_acpi_device(dev);
  86         int len;
  87
  88         /* Device has no HID and no CID or string is >1024 */
  89         len = create_modalias(acpi_dev, buf, 1024);
  90         if (len <= 0)
  91                 return 0;
  92         buf[len++] = '\n';
  93         return len;
  94 }
  95 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  96
  97 static int acpi_bus_hot_remove_device(void *context)
  98 {
  99         struct acpi_device *device;
 100         acpi_handle handle = context;
 101         struct acpi_object_list arg_list;
 102         union acpi_object arg;
 103         acpi_status status = AE_OK;
 104
 105         if (acpi_bus_get_device(handle, &device))
 106                 return 0;
 107
 108         if (!device)
 109                 return 0;
 110
 111         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 112                 "Hot-removing device %s...\n", device->dev.bus_id));
 113
 114
 115         if (acpi_bus_trim(device, 1)) {
 116                 printk(KERN_ERR PREFIX
 117                                 "Removing device failed\n");
 118                 return -1;
 119         }
 120
 121         /* power off device */
 122         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 123         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 124                 printk(KERN_WARNING PREFIX
 125                                 "Power-off device failed\n");
 126
 127         if (device->flags.lockable) {
 128                 arg_list.count = 1;
 129                 arg_list.pointer = &arg;
 130                 arg.type = ACPI_TYPE_INTEGER;
 131                 arg.integer.value = 0;
 132                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 133         }
 134
 135         arg_list.count = 1;
 136         arg_list.pointer = &arg;
 137         arg.type = ACPI_TYPE_INTEGER;
 138         arg.integer.value = 1;
 139
 140         /*
 141          * TBD: _EJD support.
 142          */
 143         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 144         if (ACPI_FAILURE(status))
 145                 return -ENODEV;
 146
 147         return 0;
 148 }
 149
 150 static ssize_t
 151 acpi_eject_store(struct device *d, struct device_attribute *attr,
 152                 const char *buf, size_t count)
 153 {
 154         int ret = count;
 155         acpi_status status;
 156         acpi_object_type type = 0;
 157         struct acpi_device *acpi_device = to_acpi_device(d);
 158         struct task_struct *task;
 159
 160         if ((!count) || (buf[0] != '1')) {
 161                 return -EINVAL;
 162         }
 163 #ifndef FORCE_EJECT
 164         if (acpi_device->driver == NULL) {
 165                 ret = -ENODEV;
 166                 goto err;
 167         }
 168 #endif
 169         status = acpi_get_type(acpi_device->handle, &type);
 170         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 171                 ret = -ENODEV;
 172                 goto err;
 173         }
 174
 175         /* remove the device in another thread to fix the deadlock issue */
 176         task = kthread_run(acpi_bus_hot_remove_device,
 177                                 acpi_device->handle, "acpi_hot_remove_device");
 178         if (IS_ERR(task))
 179                 ret = PTR_ERR(task);
 180 err:
 181         return ret;
 182 }
 183
 184 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 185
 186 static ssize_t
 187 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 188         struct acpi_device *acpi_dev = to_acpi_device(dev);
 189
 190         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
 191 }
 192 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 193
 194 static ssize_t
 195 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 196         struct acpi_device *acpi_dev = to_acpi_device(dev);
 197         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 198         int result;
 199
 200         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 201         if(result)
 202                 goto end;
 203
 204         result = sprintf(buf, "%s\n", (char*)path.pointer);
 205         kfree(path.pointer);
 206   end:
 207         return result;
 208 }
 209 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 210
 211 static int acpi_device_setup_files(struct acpi_device *dev)
 212 {
 213         acpi_status status;
 214         acpi_handle temp;
 215         int result = 0;
 216
 217         /*
 218          * Devices gotten from FADT don't have a "path" attribute
 219          */
 220         if(dev->handle) {
 221                 result = device_create_file(&dev->dev, &dev_attr_path);
 222                 if(result)
 223                         goto end;
 224         }
 225
 226         if(dev->flags.hardware_id) {
 227                 result = device_create_file(&dev->dev, &dev_attr_hid);
 228                 if(result)
 229                         goto end;
 230         }
 231
 232         if (dev->flags.hardware_id || dev->flags.compatible_ids){
 233                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 234                 if(result)
 235                         goto end;
 236         }
 237
 238         /*
 239          * If device has _EJ0, 'eject' file is created that is used to trigger
 240          * hot-removal function from userland.
 241          */
 242         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 243         if (ACPI_SUCCESS(status))
 244                 result = device_create_file(&dev->dev, &dev_attr_eject);
 245   end:
 246         return result;
 247 }
 248
 249 static void acpi_device_remove_files(struct acpi_device *dev)
 250 {
 251         acpi_status status;
 252         acpi_handle temp;
 253
 254         /*
 255          * If device has _EJ0, 'eject' file is created that is used to trigger
 256          * hot-removal function from userland.
 257          */
 258         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 259         if (ACPI_SUCCESS(status))
 260                 device_remove_file(&dev->dev, &dev_attr_eject);
 261
 262         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 263                 device_remove_file(&dev->dev, &dev_attr_modalias);
 264
 265         if(dev->flags.hardware_id)
 266                 device_remove_file(&dev->dev, &dev_attr_hid);
 267         if(dev->handle)
 268                 device_remove_file(&dev->dev, &dev_attr_path);
 269 }
 270 /* --------------------------------------------------------------------------
 271                         ACPI Bus operations
 272    -------------------------------------------------------------------------- */
 273
 274 int acpi_match_device_ids(struct acpi_device *device,
 275                           const struct acpi_device_id *ids)
 276 {
 277         const struct acpi_device_id *id;
 278
 279         /*
 280          * If the device is not present, it is unnecessary to load device
 281          * driver for it.
 282          */
 283         if (!device->status.present)
 284                 return -ENODEV;
 285
 286         if (device->flags.hardware_id) {
 287                 for (id = ids; id->id[0]; id++) {
 288                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 289                                 return 0;
 290                 }
 291         }
 292
 293         if (device->flags.compatible_ids) {
 294                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 295                 int i;
 296
 297                 for (id = ids; id->id[0]; id++) {
 298                         /* compare multiple _CID entries against driver ids */
 299                         for (i = 0; i < cid_list->count; i++) {
 300                                 if (!strcmp((char*)id->id,
 301                                             cid_list->id[i].value))
 302                                         return 0;
 303                         }
 304                 }
 305         }
 306
 307         return -ENOENT;
 308 }
 309 EXPORT_SYMBOL(acpi_match_device_ids);
 310
 311 static void acpi_device_release(struct device *dev)
 312 {
 313         struct acpi_device *acpi_dev = to_acpi_device(dev);
 314
 315         kfree(acpi_dev->pnp.cid_list);
 316         kfree(acpi_dev);
 317 }
 318
 319 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 320 {
 321         struct acpi_device *acpi_dev = to_acpi_device(dev);
 322         struct acpi_driver *acpi_drv = acpi_dev->driver;
 323
 324         if (acpi_drv && acpi_drv->ops.suspend)
 325                 return acpi_drv->ops.suspend(acpi_dev, state);
 326         return 0;
 327 }
 328
 329 static int acpi_device_resume(struct device *dev)
 330 {
 331         struct acpi_device *acpi_dev = to_acpi_device(dev);
 332         struct acpi_driver *acpi_drv = acpi_dev->driver;
 333
 334         if (acpi_drv && acpi_drv->ops.resume)
 335                 return acpi_drv->ops.resume(acpi_dev);
 336         return 0;
 337 }
 338
 339 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 340 {
 341         struct acpi_device *acpi_dev = to_acpi_device(dev);
 342         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 343
 344         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 345 }
 346
 347 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 348 {
 349         struct acpi_device *acpi_dev = to_acpi_device(dev);
 350         int len;
 351
 352         if (add_uevent_var(env, "MODALIAS="))
 353                 return -ENOMEM;
 354         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 355                               sizeof(env->buf) - env->buflen);
 356         if (len >= (sizeof(env->buf) - env->buflen))
 357                 return -ENOMEM;
 358         env->buflen += len;
 359         return 0;
 360 }
 361
 362 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 363 static int acpi_start_single_object(struct acpi_device *);
 364 static int acpi_device_probe(struct device * dev)
 365 {
 366         struct acpi_device *acpi_dev = to_acpi_device(dev);
 367         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 368         int ret;
 369
 370         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 371         if (!ret) {
 372                 if (acpi_dev->bus_ops.acpi_op_start)
 373                         acpi_start_single_object(acpi_dev);
 374                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 375                         "Found driver [%s] for device [%s]\n",
 376                         acpi_drv->name, acpi_dev->pnp.bus_id));
 377                 get_device(dev);
 378         }
 379         return ret;
 380 }
 381
 382 static int acpi_device_remove(struct device * dev)
 383 {
 384         struct acpi_device *acpi_dev = to_acpi_device(dev);
 385         struct acpi_driver *acpi_drv = acpi_dev->driver;
 386
 387         if (acpi_drv) {
 388                 if (acpi_drv->ops.stop)
 389                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 390                 if (acpi_drv->ops.remove)
 391                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 392         }
 393         acpi_dev->driver = NULL;
 394         acpi_dev->driver_data = NULL;
 395
 396         put_device(dev);
 397         return 0;
 398 }
 399
 400 static void acpi_device_shutdown(struct device *dev)
 401 {
 402         struct acpi_device *acpi_dev = to_acpi_device(dev);
 403         struct acpi_driver *acpi_drv = acpi_dev->driver;
 404
 405         if (acpi_drv && acpi_drv->ops.shutdown)
 406                 acpi_drv->ops.shutdown(acpi_dev);
 407
 408         return ;
 409 }
 410
 411 struct bus_type acpi_bus_type = {
 412         .name           = "acpi",
 413         .suspend        = acpi_device_suspend,
 414         .resume         = acpi_device_resume,
 415         .shutdown       = acpi_device_shutdown,
 416         .match          = acpi_bus_match,
 417         .probe          = acpi_device_probe,
 418         .remove         = acpi_device_remove,
 419         .uevent         = acpi_device_uevent,
 420 };
 421
 422 static int acpi_device_register(struct acpi_device *device,
 423                                  struct acpi_device *parent)
 424 {
 425         int result;
 426         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 427         int found = 0;
 428         /*
 429          * Linkage
 430          * -------
 431          * Link this device to its parent and siblings.
 432          */
 433         INIT_LIST_HEAD(&device->children);
 434         INIT_LIST_HEAD(&device->node);
 435         INIT_LIST_HEAD(&device->g_list);
 436         INIT_LIST_HEAD(&device->wakeup_list);
 437
 438         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 439         if (!new_bus_id) {
 440                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 441                 return -ENOMEM;
 442         }
 443
 444         spin_lock(&acpi_device_lock);
 445         /*
 446          * Find suitable bus_id and instance number in acpi_bus_id_list
 447          * If failed, create one and link it into acpi_bus_id_list
 448          */
 449         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 450                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 451                         acpi_device_bus_id->instance_no ++;
 452                         found = 1;
 453                         kfree(new_bus_id);
 454                         break;
 455                 }
 456         }
 457         if(!found) {
 458                 acpi_device_bus_id = new_bus_id;
 459                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 460                 acpi_device_bus_id->instance_no = 0;
 461                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 462         }
 463         sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 464
 465         if (device->parent) {
 466                 list_add_tail(&device->node, &device->parent->children);
 467                 list_add_tail(&device->g_list, &device->parent->g_list);
 468         } else
 469                 list_add_tail(&device->g_list, &acpi_device_list);
 470         if (device->wakeup.flags.valid)
 471                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 472         spin_unlock(&acpi_device_lock);
 473
 474         if (device->parent)
 475                 device->dev.parent = &parent->dev;
 476         device->dev.bus = &acpi_bus_type;
 477         device_initialize(&device->dev);
 478         device->dev.release = &acpi_device_release;
 479         result = device_add(&device->dev);
 480         if(result) {
 481                 dev_err(&device->dev, "Error adding device\n");
 482                 goto end;
 483         }
 484
 485         result = acpi_device_setup_files(device);
 486         if(result)
 487                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", device->dev.bus_id);
 488
 489         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 490         return 0;
 491   end:
 492         spin_lock(&acpi_device_lock);
 493         if (device->parent) {
 494                 list_del(&device->node);
 495                 list_del(&device->g_list);
 496         } else
 497                 list_del(&device->g_list);
 498         list_del(&device->wakeup_list);
 499         spin_unlock(&acpi_device_lock);
 500         return result;
 501 }
 502
 503 static void acpi_device_unregister(struct acpi_device *device, int type)
 504 {
 505         spin_lock(&acpi_device_lock);
 506         if (device->parent) {
 507                 list_del(&device->node);
 508                 list_del(&device->g_list);
 509         } else
 510                 list_del(&device->g_list);
 511
 512         list_del(&device->wakeup_list);
 513         spin_unlock(&acpi_device_lock);
 514
 515         acpi_detach_data(device->handle, acpi_bus_data_handler);
 516
 517         acpi_device_remove_files(device);
 518         device_unregister(&device->dev);
 519 }
 520
 521 /* --------------------------------------------------------------------------
 522                                  Driver Management
 523    -------------------------------------------------------------------------- */
 524 /**
 525  * acpi_bus_driver_init - add a device to a driver
 526  * @device: the device to add and initialize
 527  * @driver: driver for the device
 528  *
 529  * Used to initialize a device via its device driver.  Called whenever a
 530  * driver is bound to a device.  Invokes the driver's add() ops.
 531  */
 532 static int
 533 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 534 {
 535         int result = 0;
 536
 537
 538         if (!device || !driver)
 539                 return -EINVAL;
 540
 541         if (!driver->ops.add)
 542                 return -ENOSYS;
 543
 544         result = driver->ops.add(device);
 545         if (result) {
 546                 device->driver = NULL;
 547                 device->driver_data = NULL;
 548                 return result;
 549         }
 550
 551         device->driver = driver;
 552
 553         /*
 554          * TBD - Configuration Management: Assign resources to device based
 555          * upon possible configuration and currently allocated resources.
 556          */
 557
 558         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 559                           "Driver successfully bound to device\n"));
 560         return 0;
 561 }
 562
 563 static int acpi_start_single_object(struct acpi_device *device)
 564 {
 565         int result = 0;
 566         struct acpi_driver *driver;
 567
 568
 569         if (!(driver = device->driver))
 570                 return 0;
 571
 572         if (driver->ops.start) {
 573                 result = driver->ops.start(device);
 574                 if (result && driver->ops.remove)
 575                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 576         }
 577
 578         return result;
 579 }
 580
 581 /**
 582  * acpi_bus_register_driver - register a driver with the ACPI bus
 583  * @driver: driver being registered
 584  *
 585  * Registers a driver with the ACPI bus.  Searches the namespace for all
 586  * devices that match the driver's criteria and binds.  Returns zero for
 587  * success or a negative error status for failure.
 588  */
 589 int acpi_bus_register_driver(struct acpi_driver *driver)
 590 {
 591         int ret;
 592
 593         if (acpi_disabled)
 594                 return -ENODEV;
 595         driver->drv.name = driver->name;
 596         driver->drv.bus = &acpi_bus_type;
 597         driver->drv.owner = driver->owner;
 598
 599         ret = driver_register(&driver->drv);
 600         return ret;
 601 }
 602
 603 EXPORT_SYMBOL(acpi_bus_register_driver);
 604
 605 /**
 606  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 607  * @driver: driver to unregister
 608  *
 609  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 610  * devices that match the driver's criteria and unbinds.
 611  */
 612 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 613 {
 614         driver_unregister(&driver->drv);
 615 }
 616
 617 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 618
 619 /* --------------------------------------------------------------------------
 620                                  Device Enumeration
 621    -------------------------------------------------------------------------- */
 622 acpi_status
 623 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 624 {
 625         acpi_status status;
 626         acpi_handle tmp;
 627         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 628         union acpi_object *obj;
 629
 630         status = acpi_get_handle(handle, "_EJD", &tmp);
 631         if (ACPI_FAILURE(status))
 632                 return status;
 633
 634         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 635         if (ACPI_SUCCESS(status)) {
 636                 obj = buffer.pointer;
 637                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 638                                          ejd);
 639                 kfree(buffer.pointer);
 640         }
 641         return status;
 642 }
 643 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 644
 645 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 646 {
 647
 648         /* TBD */
 649
 650         return;
 651 }
 652
 653 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 654 {
 655         device->performance.state = ACPI_STATE_UNKNOWN;
 656         return 0;
 657 }
 658
 659 static acpi_status
 660 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 661                                              union acpi_object *package)
 662 {
 663         int i = 0;
 664         union acpi_object *element = NULL;
 665
 666         if (!device || !package || (package->package.count < 2))
 667                 return AE_BAD_PARAMETER;
 668
 669         element = &(package->package.elements[0]);
 670         if (!element)
 671                 return AE_BAD_PARAMETER;
 672         if (element->type == ACPI_TYPE_PACKAGE) {
 673                 if ((element->package.count < 2) ||
 674                     (element->package.elements[0].type !=
 675                      ACPI_TYPE_LOCAL_REFERENCE)
 676                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 677                         return AE_BAD_DATA;
 678                 device->wakeup.gpe_device =
 679                     element->package.elements[0].reference.handle;
 680                 device->wakeup.gpe_number =
 681                     (u32) element->package.elements[1].integer.value;
 682         } else if (element->type == ACPI_TYPE_INTEGER) {
 683                 device->wakeup.gpe_number = element->integer.value;
 684         } else
 685                 return AE_BAD_DATA;
 686
 687         element = &(package->package.elements[1]);
 688         if (element->type != ACPI_TYPE_INTEGER) {
 689                 return AE_BAD_DATA;
 690         }
 691         device->wakeup.sleep_state = element->integer.value;
 692
 693         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 694                 return AE_NO_MEMORY;
 695         }
 696         device->wakeup.resources.count = package->package.count - 2;
 697         for (i = 0; i < device->wakeup.resources.count; i++) {
 698                 element = &(package->package.elements[i + 2]);
 699                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 700                         return AE_BAD_DATA;
 701
 702                 device->wakeup.resources.handles[i] = element->reference.handle;
 703         }
 704
 705         return AE_OK;
 706 }
 707
 708 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 709 {
 710         acpi_status status = 0;
 711         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 712         union acpi_object *package = NULL;
 713         int psw_error;
 714
 715         struct acpi_device_id button_device_ids[] = {
 716                 {"PNP0C0D", 0},
 717                 {"PNP0C0C", 0},
 718                 {"PNP0C0E", 0},
 719                 {"", 0},
 720         };
 721
 722         /* _PRW */
 723         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 724         if (ACPI_FAILURE(status)) {
 725                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 726                 goto end;
 727         }
 728
 729         package = (union acpi_object *)buffer.pointer;
 730         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 731         if (ACPI_FAILURE(status)) {
 732                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 733                 goto end;
 734         }
 735
 736         kfree(buffer.pointer);
 737
 738         device->wakeup.flags.valid = 1;
 739         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 740          * system for the ACPI device with the _PRW object.
 741          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 742          * So it is necessary to call _DSW object first. Only when it is not
 743          * present will the _PSW object used.
 744          */
 745         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 746         if (psw_error)
 747                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 748                                 "error in _DSW or _PSW evaluation\n"));
 749
 750         /* Power button, Lid switch always enable wakeup */
 751         if (!acpi_match_device_ids(device, button_device_ids))
 752                 device->wakeup.flags.run_wake = 1;
 753
 754         /*
 755          * Don't set Power button GPE as run_wake
 756          * if Fixed Power button is used
 757          */
 758         if (!strcmp(device->pnp.hardware_id, "PNP0C0C") &&
 759                 !(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
 760                 device->wakeup.flags.run_wake = 0;
 761                 device->wakeup.flags.valid = 0;
 762         }
 763
 764       end:
 765         if (ACPI_FAILURE(status))
 766                 device->flags.wake_capable = 0;
 767         return 0;
 768 }
 769
 770 static int acpi_bus_get_power_flags(struct acpi_device *device)
 771 {
 772         acpi_status status = 0;
 773         acpi_handle handle = NULL;
 774         u32 i = 0;
 775
 776
 777         /*
 778          * Power Management Flags
 779          */
 780         status = acpi_get_handle(device->handle, "_PSC", &handle);
 781         if (ACPI_SUCCESS(status))
 782                 device->power.flags.explicit_get = 1;
 783         status = acpi_get_handle(device->handle, "_IRC", &handle);
 784         if (ACPI_SUCCESS(status))
 785                 device->power.flags.inrush_current = 1;
 786
 787         /*
 788          * Enumerate supported power management states
 789          */
 790         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 791                 struct acpi_device_power_state *ps = &device->power.states[i];
 792                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 793
 794                 /* Evaluate "_PRx" to se if power resources are referenced */
 795                 acpi_evaluate_reference(device->handle, object_name, NULL,
 796                                         &ps->resources);
 797                 if (ps->resources.count) {
 798                         device->power.flags.power_resources = 1;
 799                         ps->flags.valid = 1;
 800                 }
 801
 802                 /* Evaluate "_PSx" to see if we can do explicit sets */
 803                 object_name[2] = 'S';
 804                 status = acpi_get_handle(device->handle, object_name, &handle);
 805                 if (ACPI_SUCCESS(status)) {
 806                         ps->flags.explicit_set = 1;
 807                         ps->flags.valid = 1;
 808                 }
 809
 810                 /* State is valid if we have some power control */
 811                 if (ps->resources.count || ps->flags.explicit_set)
 812                         ps->flags.valid = 1;
 813
 814                 ps->power = -1; /* Unknown - driver assigned */
 815                 ps->latency = -1;       /* Unknown - driver assigned */
 816         }
 817
 818         /* Set defaults for D0 and D3 states (always valid) */
 819         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 820         device->power.states[ACPI_STATE_D0].power = 100;
 821         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 822         device->power.states[ACPI_STATE_D3].power = 0;
 823
 824         /* TBD: System wake support and resource requirements. */
 825
 826         device->power.state = ACPI_STATE_UNKNOWN;
 827         acpi_bus_get_power(device->handle, &(device->power.state));
 828
 829         return 0;
 830 }
 831
 832 static int acpi_bus_get_flags(struct acpi_device *device)
 833 {
 834         acpi_status status = AE_OK;
 835         acpi_handle temp = NULL;
 836
 837
 838         /* Presence of _STA indicates 'dynamic_status' */
 839         status = acpi_get_handle(device->handle, "_STA", &temp);
 840         if (ACPI_SUCCESS(status))
 841                 device->flags.dynamic_status = 1;
 842
 843         /* Presence of _CID indicates 'compatible_ids' */
 844         status = acpi_get_handle(device->handle, "_CID", &temp);
 845         if (ACPI_SUCCESS(status))
 846                 device->flags.compatible_ids = 1;
 847
 848         /* Presence of _RMV indicates 'removable' */
 849         status = acpi_get_handle(device->handle, "_RMV", &temp);
 850         if (ACPI_SUCCESS(status))
 851                 device->flags.removable = 1;
 852
 853         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 854         status = acpi_get_handle(device->handle, "_EJD", &temp);
 855         if (ACPI_SUCCESS(status))
 856                 device->flags.ejectable = 1;
 857         else {
 858                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 859                 if (ACPI_SUCCESS(status))
 860                         device->flags.ejectable = 1;
 861         }
 862
 863         /* Presence of _LCK indicates 'lockable' */
 864         status = acpi_get_handle(device->handle, "_LCK", &temp);
 865         if (ACPI_SUCCESS(status))
 866                 device->flags.lockable = 1;
 867
 868         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 869         status = acpi_get_handle(device->handle, "_PS0", &temp);
 870         if (ACPI_FAILURE(status))
 871                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 872         if (ACPI_SUCCESS(status))
 873                 device->flags.power_manageable = 1;
 874
 875         /* Presence of _PRW indicates wake capable */
 876         status = acpi_get_handle(device->handle, "_PRW", &temp);
 877         if (ACPI_SUCCESS(status))
 878                 device->flags.wake_capable = 1;
 879
 880         /* TBD: Performance management */
 881
 882         return 0;
 883 }
 884
 885 static void acpi_device_get_busid(struct acpi_device *device,
 886                                   acpi_handle handle, int type)
 887 {
 888         char bus_id[5] = { '?', 0 };
 889         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 890         int i = 0;
 891
 892         /*
 893          * Bus ID
 894          * ------
 895          * The device's Bus ID is simply the object name.
 896          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 897          */
 898         switch (type) {
 899         case ACPI_BUS_TYPE_SYSTEM:
 900                 strcpy(device->pnp.bus_id, "ACPI");
 901                 break;
 902         case ACPI_BUS_TYPE_POWER_BUTTON:
 903                 strcpy(device->pnp.bus_id, "PWRF");
 904                 break;
 905         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 906                 strcpy(device->pnp.bus_id, "SLPF");
 907                 break;
 908         default:
 909                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 910                 /* Clean up trailing underscores (if any) */
 911                 for (i = 3; i > 1; i--) {
 912                         if (bus_id[i] == '_')
 913                                 bus_id[i] = '\0';
 914                         else
 915                                 break;
 916                 }
 917                 strcpy(device->pnp.bus_id, bus_id);
 918                 break;
 919         }
 920 }
 921
 922 static int
 923 acpi_video_bus_match(struct acpi_device *device)
 924 {
 925         acpi_handle h_dummy;
 926
 927         if (!device)
 928                 return -EINVAL;
 929
 930         /* Since there is no HID, CID for ACPI Video drivers, we have
 931          * to check well known required nodes for each feature we support.
 932          */
 933
 934         /* Does this device able to support video switching ? */
 935         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) &&
 936             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
 937                 return 0;
 938
 939         /* Does this device able to retrieve a video ROM ? */
 940         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
 941                 return 0;
 942
 943         /* Does this device able to configure which video head to be POSTed ? */
 944         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) &&
 945             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) &&
 946             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy)))
 947                 return 0;
 948
 949         return -ENODEV;
 950 }
 951
 952 /*
 953  * acpi_bay_match - see if a device is an ejectable driver bay
 954  *
 955  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 956  * then we can safely call it an ejectable drive bay
 957  */
 958 static int acpi_bay_match(struct acpi_device *device){
 959         acpi_status status;
 960         acpi_handle handle;
 961         acpi_handle tmp;
 962         acpi_handle phandle;
 963
 964         handle = device->handle;
 965
 966         status = acpi_get_handle(handle, "_EJ0", &tmp);
 967         if (ACPI_FAILURE(status))
 968                 return -ENODEV;
 969
 970         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 971                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 972                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 973                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 974                 return 0;
 975
 976         if (acpi_get_parent(handle, &phandle))
 977                 return -ENODEV;
 978
 979         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 980                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 981                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 982                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 983                 return 0;
 984
 985         return -ENODEV;
 986 }
 987
 988 /*
 989  * acpi_dock_match - see if a device has a _DCK method
 990  */
 991 static int acpi_dock_match(struct acpi_device *device)
 992 {
 993         acpi_handle tmp;
 994         return acpi_get_handle(device->handle, "_DCK", &tmp);
 995 }
 996
 997 static void acpi_device_set_id(struct acpi_device *device,
 998                                struct acpi_device *parent, acpi_handle handle,
 999                                int type)
1000 {
1001         struct acpi_device_info *info;
1002         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1003         char *hid = NULL;
1004         char *uid = NULL;
1005         struct acpi_compatible_id_list *cid_list = NULL;
1006         const char *cid_add = NULL;
1007         acpi_status status;
1008
1009         switch (type) {
1010         case ACPI_BUS_TYPE_DEVICE:
1011                 status = acpi_get_object_info(handle, &buffer);
1012                 if (ACPI_FAILURE(status)) {
1013                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1014                         return;
1015                 }
1016
1017                 info = buffer.pointer;
1018                 if (info->valid & ACPI_VALID_HID)
1019                         hid = info->hardware_id.value;
1020                 if (info->valid & ACPI_VALID_UID)
1021                         uid = info->unique_id.value;
1022                 if (info->valid & ACPI_VALID_CID)
1023                         cid_list = &info->compatibility_id;
1024                 if (info->valid & ACPI_VALID_ADR) {
1025                         device->pnp.bus_address = info->address;
1026                         device->flags.bus_address = 1;
1027                 }
1028
1029                 /* If we have a video/bay/dock device, add our selfdefined
1030                    HID to the CID list. Like that the video/bay/dock drivers
1031                    will get autoloaded and the device might still match
1032                    against another driver.
1033                 */
1034                 if (ACPI_SUCCESS(acpi_video_bus_match(device)))
1035                         cid_add = ACPI_VIDEO_HID;
1036                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1037                         cid_add = ACPI_BAY_HID;
1038                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1039                         cid_add = ACPI_DOCK_HID;
1040
1041                 break;
1042         case ACPI_BUS_TYPE_POWER:
1043                 hid = ACPI_POWER_HID;
1044                 break;
1045         case ACPI_BUS_TYPE_PROCESSOR:
1046                 hid = ACPI_PROCESSOR_HID;
1047                 break;
1048         case ACPI_BUS_TYPE_SYSTEM:
1049                 hid = ACPI_SYSTEM_HID;
1050                 break;
1051         case ACPI_BUS_TYPE_THERMAL:
1052                 hid = ACPI_THERMAL_HID;
1053                 break;
1054         case ACPI_BUS_TYPE_POWER_BUTTON:
1055                 hid = ACPI_BUTTON_HID_POWERF;
1056                 break;
1057         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1058                 hid = ACPI_BUTTON_HID_SLEEPF;
1059                 break;
1060         }
1061
1062         /*
1063          * \_SB
1064          * ----
1065          * Fix for the system root bus device -- the only root-level device.
1066          */
1067         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1068                 hid = ACPI_BUS_HID;
1069                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1070                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1071         }
1072
1073         if (hid) {
1074                 strcpy(device->pnp.hardware_id, hid);
1075                 device->flags.hardware_id = 1;
1076         }
1077         if (uid) {
1078                 strcpy(device->pnp.unique_id, uid);
1079                 device->flags.unique_id = 1;
1080         }
1081         if (cid_list || cid_add) {
1082                 struct  acpi_compatible_id_list *list;
1083                 int size = 0;
1084                 int count = 0;
1085
1086                 if (cid_list) {
1087                         size = cid_list->size;
1088                 } else if (cid_add) {
1089                         size = sizeof(struct acpi_compatible_id_list);
1090                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1091                         if (!cid_list) {
1092                                 printk(KERN_ERR "Memory allocation error\n");
1093                                 kfree(buffer.pointer);
1094                                 return;
1095                         } else {
1096                                 cid_list->count = 0;
1097                                 cid_list->size = size;
1098                         }
1099                 }
1100                 if (cid_add)
1101                         size += sizeof(struct acpi_compatible_id);
1102                 list = kmalloc(size, GFP_KERNEL);
1103
1104                 if (list) {
1105                         if (cid_list) {
1106                                 memcpy(list, cid_list, cid_list->size);
1107                                 count = cid_list->count;
1108                         }
1109                         if (cid_add) {
1110                                 strncpy(list->id[count].value, cid_add,
1111                                         ACPI_MAX_CID_LENGTH);
1112                                 count++;
1113                                 device->flags.compatible_ids = 1;
1114                         }
1115                         list->size = size;
1116                         list->count = count;
1117                         device->pnp.cid_list = list;
1118                 } else
1119                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1120         }
1121
1122         kfree(buffer.pointer);
1123 }
1124
1125 static int acpi_device_set_context(struct acpi_device *device, int type)
1126 {
1127         acpi_status status = AE_OK;
1128         int result = 0;
1129         /*
1130          * Context
1131          * -------
1132          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1133          * resolutions from handle->device very efficient.  Note that we need
1134          * to be careful with fixed-feature devices as they all attach to the
1135          * root object.
1136          */
1137         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1138             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1139                 status = acpi_attach_data(device->handle,
1140                                           acpi_bus_data_handler, device);
1141
1142                 if (ACPI_FAILURE(status)) {
1143                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1144                         result = -ENODEV;
1145                 }
1146         }
1147         return result;
1148 }
1149
1150 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1151 {
1152         if (!dev)
1153                 return -EINVAL;
1154
1155         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1156         device_release_driver(&dev->dev);
1157
1158         if (!rmdevice)
1159                 return 0;
1160
1161         /*
1162          * unbind _ADR-Based Devices when hot removal
1163          */
1164         if (dev->flags.bus_address) {
1165                 if ((dev->parent) && (dev->parent->ops.unbind))
1166                         dev->parent->ops.unbind(dev);
1167         }
1168         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1169
1170         return 0;
1171 }
1172
1173 static int
1174 acpi_add_single_object(struct acpi_device **child,
1175                        struct acpi_device *parent, acpi_handle handle, int type,
1176                         struct acpi_bus_ops *ops)
1177 {
1178         int result = 0;
1179         struct acpi_device *device = NULL;
1180
1181
1182         if (!child)
1183                 return -EINVAL;
1184
1185         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1186         if (!device) {
1187                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1188                 return -ENOMEM;
1189         }
1190
1191         device->handle = handle;
1192         device->parent = parent;
1193         device->bus_ops = *ops; /* workround for not call .start */
1194
1195
1196         acpi_device_get_busid(device, handle, type);
1197
1198         /*
1199          * Flags
1200          * -----
1201          * Get prior to calling acpi_bus_get_status() so we know whether
1202          * or not _STA is present.  Note that we only look for object
1203          * handles -- cannot evaluate objects until we know the device is
1204          * present and properly initialized.
1205          */
1206         result = acpi_bus_get_flags(device);
1207         if (result)
1208                 goto end;
1209
1210         /*
1211          * Status
1212          * ------
1213          * See if the device is present.  We always assume that non-Device
1214          * and non-Processor objects (e.g. thermal zones, power resources,
1215          * etc.) are present, functioning, etc. (at least when parent object
1216          * is present).  Note that _STA has a different meaning for some
1217          * objects (e.g. power resources) so we need to be careful how we use
1218          * it.
1219          */
1220         switch (type) {
1221         case ACPI_BUS_TYPE_PROCESSOR:
1222         case ACPI_BUS_TYPE_DEVICE:
1223                 result = acpi_bus_get_status(device);
1224                 if (ACPI_FAILURE(result)) {
1225                         result = -ENODEV;
1226                         goto end;
1227                 }
1228                 /*
1229                  * When the device is neither present nor functional, the
1230                  * device should not be added to Linux ACPI device tree.
1231                  * When the status of the device is not present but functinal,
1232                  * it should be added to Linux ACPI tree. For example : bay
1233                  * device , dock device.
1234                  * In such conditions it is unncessary to check whether it is
1235                  * bay device or dock device.
1236                  */
1237                 if (!device->status.present && !device->status.functional) {
1238                         result = -ENODEV;
1239                         goto end;
1240                 }
1241                 break;
1242         default:
1243                 STRUCT_TO_INT(device->status) =
1244                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1245                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1246                 break;
1247         }
1248
1249         /*
1250          * Initialize Device
1251          * -----------------
1252          * TBD: Synch with Core's enumeration/initialization process.
1253          */
1254
1255         /*
1256          * Hardware ID, Unique ID, & Bus Address
1257          * -------------------------------------
1258          */
1259         acpi_device_set_id(device, parent, handle, type);
1260
1261         /*
1262          * The ACPI device is attached to acpi handle before getting
1263          * the power/wakeup/peformance flags. Otherwise OS can't get
1264          * the corresponding ACPI device by the acpi handle in the course
1265          * of getting the power/wakeup/performance flags.
1266          */
1267         result = acpi_device_set_context(device, type);
1268         if (result)
1269                 goto end;
1270
1271         /*
1272          * Power Management
1273          * ----------------
1274          */
1275         if (device->flags.power_manageable) {
1276                 result = acpi_bus_get_power_flags(device);
1277                 if (result)
1278                         goto end;
1279         }
1280
1281         /*
1282          * Wakeup device management
1283          *-----------------------
1284          */
1285         if (device->flags.wake_capable) {
1286                 result = acpi_bus_get_wakeup_device_flags(device);
1287                 if (result)
1288                         goto end;
1289         }
1290
1291         /*
1292          * Performance Management
1293          * ----------------------
1294          */
1295         if (device->flags.performance_manageable) {
1296                 result = acpi_bus_get_perf_flags(device);
1297                 if (result)
1298                         goto end;
1299         }
1300
1301
1302         result = acpi_device_register(device, parent);
1303
1304         /*
1305          * Bind _ADR-Based Devices when hot add
1306          */
1307         if (device->flags.bus_address) {
1308                 if (device->parent && device->parent->ops.bind)
1309                         device->parent->ops.bind(device);
1310         }
1311
1312       end:
1313         if (!result)
1314                 *child = device;
1315         else {
1316                 kfree(device->pnp.cid_list);
1317                 kfree(device);
1318         }
1319
1320         return result;
1321 }
1322
1323 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1324 {
1325         acpi_status status = AE_OK;
1326         struct acpi_device *parent = NULL;
1327         struct acpi_device *child = NULL;
1328         acpi_handle phandle = NULL;
1329         acpi_handle chandle = NULL;
1330         acpi_object_type type = 0;
1331         u32 level = 1;
1332
1333
1334         if (!start)
1335                 return -EINVAL;
1336
1337         parent = start;
1338         phandle = start->handle;
1339
1340         /*
1341          * Parse through the ACPI namespace, identify all 'devices', and
1342          * create a new 'struct acpi_device' for each.
1343          */
1344         while ((level > 0) && parent) {
1345
1346                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1347                                               chandle, &chandle);
1348
1349                 /*
1350                  * If this scope is exhausted then move our way back up.
1351                  */
1352                 if (ACPI_FAILURE(status)) {
1353                         level--;
1354                         chandle = phandle;
1355                         acpi_get_parent(phandle, &phandle);
1356                         if (parent->parent)
1357                                 parent = parent->parent;
1358                         continue;
1359                 }
1360
1361                 status = acpi_get_type(chandle, &type);
1362                 if (ACPI_FAILURE(status))
1363                         continue;
1364
1365                 /*
1366                  * If this is a scope object then parse it (depth-first).
1367                  */
1368                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1369                         level++;
1370                         phandle = chandle;
1371                         chandle = NULL;
1372                         continue;
1373                 }
1374
1375                 /*
1376                  * We're only interested in objects that we consider 'devices'.
1377                  */
1378                 switch (type) {
1379                 case ACPI_TYPE_DEVICE:
1380                         type = ACPI_BUS_TYPE_DEVICE;
1381                         break;
1382                 case ACPI_TYPE_PROCESSOR:
1383                         type = ACPI_BUS_TYPE_PROCESSOR;
1384                         break;
1385                 case ACPI_TYPE_THERMAL:
1386                         type = ACPI_BUS_TYPE_THERMAL;
1387                         break;
1388                 case ACPI_TYPE_POWER:
1389                         type = ACPI_BUS_TYPE_POWER;
1390                         break;
1391                 default:
1392                         continue;
1393                 }
1394
1395                 if (ops->acpi_op_add)
1396                         status = acpi_add_single_object(&child, parent,
1397                                 chandle, type, ops);
1398                 else
1399                         status = acpi_bus_get_device(chandle, &child);
1400
1401                 if (ACPI_FAILURE(status))
1402                         continue;
1403
1404                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1405                         status = acpi_start_single_object(child);
1406                         if (ACPI_FAILURE(status))
1407                                 continue;
1408                 }
1409
1410                 /*
1411                  * If the device is present, enabled, and functioning then
1412                  * parse its scope (depth-first).  Note that we need to
1413                  * represent absent devices to facilitate PnP notifications
1414                  * -- but only the subtree head (not all of its children,
1415                  * which will be enumerated when the parent is inserted).
1416                  *
1417                  * TBD: Need notifications and other detection mechanisms
1418                  *      in place before we can fully implement this.
1419                  */
1420                  /*
1421                  * When the device is not present but functional, it is also
1422                  * necessary to scan the children of this device.
1423                  */
1424                 if (child->status.present || (!child->status.present &&
1425                                         child->status.functional)) {
1426                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1427                                                       NULL, NULL);
1428                         if (ACPI_SUCCESS(status)) {
1429                                 level++;
1430                                 phandle = chandle;
1431                                 chandle = NULL;
1432                                 parent = child;
1433                         }
1434                 }
1435         }
1436
1437         return 0;
1438 }
1439
1440 int
1441 acpi_bus_add(struct acpi_device **child,
1442              struct acpi_device *parent, acpi_handle handle, int type)
1443 {
1444         int result;
1445         struct acpi_bus_ops ops;
1446
1447         memset(&ops, 0, sizeof(ops));
1448         ops.acpi_op_add = 1;
1449
1450         result = acpi_add_single_object(child, parent, handle, type, &ops);
1451         if (!result)
1452                 result = acpi_bus_scan(*child, &ops);
1453
1454         return result;
1455 }
1456
1457 EXPORT_SYMBOL(acpi_bus_add);
1458
1459 int acpi_bus_start(struct acpi_device *device)
1460 {
1461         int result;
1462         struct acpi_bus_ops ops;
1463
1464
1465         if (!device)
1466                 return -EINVAL;
1467
1468         result = acpi_start_single_object(device);
1469         if (!result) {
1470                 memset(&ops, 0, sizeof(ops));
1471                 ops.acpi_op_start = 1;
1472                 result = acpi_bus_scan(device, &ops);
1473         }
1474         return result;
1475 }
1476
1477 EXPORT_SYMBOL(acpi_bus_start);
1478
1479 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1480 {
1481         acpi_status status;
1482         struct acpi_device *parent, *child;
1483         acpi_handle phandle, chandle;
1484         acpi_object_type type;
1485         u32 level = 1;
1486         int err = 0;
1487
1488         parent = start;
1489         phandle = start->handle;
1490         child = chandle = NULL;
1491
1492         while ((level > 0) && parent && (!err)) {
1493                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1494                                               chandle, &chandle);
1495
1496                 /*
1497                  * If this scope is exhausted then move our way back up.
1498                  */
1499                 if (ACPI_FAILURE(status)) {
1500                         level--;
1501                         chandle = phandle;
1502                         acpi_get_parent(phandle, &phandle);
1503                         child = parent;
1504                         parent = parent->parent;
1505
1506                         if (level == 0)
1507                                 err = acpi_bus_remove(child, rmdevice);
1508                         else
1509                                 err = acpi_bus_remove(child, 1);
1510
1511                         continue;
1512                 }
1513
1514                 status = acpi_get_type(chandle, &type);
1515                 if (ACPI_FAILURE(status)) {
1516                         continue;
1517                 }
1518                 /*
1519                  * If there is a device corresponding to chandle then
1520                  * parse it (depth-first).
1521                  */
1522                 if (acpi_bus_get_device(chandle, &child) == 0) {
1523                         level++;
1524                         phandle = chandle;
1525                         chandle = NULL;
1526                         parent = child;
1527                 }
1528                 continue;
1529         }
1530         return err;
1531 }
1532 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1533
1534
1535 static int acpi_bus_scan_fixed(struct acpi_device *root)
1536 {
1537         int result = 0;
1538         struct acpi_device *device = NULL;
1539         struct acpi_bus_ops ops;
1540
1541         if (!root)
1542                 return -ENODEV;
1543
1544         memset(&ops, 0, sizeof(ops));
1545         ops.acpi_op_add = 1;
1546         ops.acpi_op_start = 1;
1547
1548         /*
1549          * Enumerate all fixed-feature devices.
1550          */
1551         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1552                 result = acpi_add_single_object(&device, acpi_root,
1553                                                 NULL,
1554                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1555                                                 &ops);
1556         }
1557
1558         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1559                 result = acpi_add_single_object(&device, acpi_root,
1560                                                 NULL,
1561                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1562                                                 &ops);
1563         }
1564
1565         return result;
1566 }
1567
1568
1569 static int __init acpi_scan_init(void)
1570 {
1571         int result;
1572         struct acpi_bus_ops ops;
1573
1574
1575         if (acpi_disabled)
1576                 return 0;
1577
1578         memset(&ops, 0, sizeof(ops));
1579         ops.acpi_op_add = 1;
1580         ops.acpi_op_start = 1;
1581
1582         result = bus_register(&acpi_bus_type);
1583         if (result) {
1584                 /* We don't want to quit even if we failed to add suspend/resume */
1585                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1586         }
1587
1588         /*
1589          * Create the root device in the bus's device tree
1590          */
1591         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1592                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1593         if (result)
1594                 goto Done;
1595
1596         /*
1597          * Enumerate devices in the ACPI namespace.
1598          */
1599         result = acpi_bus_scan_fixed(acpi_root);
1600
1601         if (!result)
1602                 result = acpi_bus_scan(acpi_root, &ops);
1603
1604         if (result)
1605                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1606
1607       Done:
1608         return result;
1609 }
1610
1611 subsys_initcall(acpi_scan_init);