SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 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                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 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         if (device->flags.hardware_id) {
 280                 for (id = ids; id->id[0]; id++) {
 281                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 282                                 return 0;
 283                 }
 284         }
 285
 286         if (device->flags.compatible_ids) {
 287                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 288                 int i;
 289
 290                 for (id = ids; id->id[0]; id++) {
 291                         /* compare multiple _CID entries against driver ids */
 292                         for (i = 0; i < cid_list->count; i++) {
 293                                 if (!strcmp((char*)id->id,
 294                                             cid_list->id[i].value))
 295                                         return 0;
 296                         }
 297                 }
 298         }
 299
 300         return -ENOENT;
 301 }
 302 EXPORT_SYMBOL(acpi_match_device_ids);
 303
 304 static void acpi_device_release(struct device *dev)
 305 {
 306         struct acpi_device *acpi_dev = to_acpi_device(dev);
 307
 308         kfree(acpi_dev->pnp.cid_list);
 309         kfree(acpi_dev);
 310 }
 311
 312 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 313 {
 314         struct acpi_device *acpi_dev = to_acpi_device(dev);
 315         struct acpi_driver *acpi_drv = acpi_dev->driver;
 316
 317         if (acpi_drv && acpi_drv->ops.suspend)
 318                 return acpi_drv->ops.suspend(acpi_dev, state);
 319         return 0;
 320 }
 321
 322 static int acpi_device_resume(struct device *dev)
 323 {
 324         struct acpi_device *acpi_dev = to_acpi_device(dev);
 325         struct acpi_driver *acpi_drv = acpi_dev->driver;
 326
 327         if (acpi_drv && acpi_drv->ops.resume)
 328                 return acpi_drv->ops.resume(acpi_dev);
 329         return 0;
 330 }
 331
 332 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 333 {
 334         struct acpi_device *acpi_dev = to_acpi_device(dev);
 335         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 336
 337         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 338 }
 339
 340 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 341 {
 342         struct acpi_device *acpi_dev = to_acpi_device(dev);
 343         int len;
 344
 345         if (add_uevent_var(env, "MODALIAS="))
 346                 return -ENOMEM;
 347         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 348                               sizeof(env->buf) - env->buflen);
 349         if (len >= (sizeof(env->buf) - env->buflen))
 350                 return -ENOMEM;
 351         env->buflen += len;
 352         return 0;
 353 }
 354
 355 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 356 static int acpi_start_single_object(struct acpi_device *);
 357 static int acpi_device_probe(struct device * dev)
 358 {
 359         struct acpi_device *acpi_dev = to_acpi_device(dev);
 360         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 361         int ret;
 362
 363         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 364         if (!ret) {
 365                 if (acpi_dev->bus_ops.acpi_op_start)
 366                         acpi_start_single_object(acpi_dev);
 367                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 368                         "Found driver [%s] for device [%s]\n",
 369                         acpi_drv->name, acpi_dev->pnp.bus_id));
 370                 get_device(dev);
 371         }
 372         return ret;
 373 }
 374
 375 static int acpi_device_remove(struct device * dev)
 376 {
 377         struct acpi_device *acpi_dev = to_acpi_device(dev);
 378         struct acpi_driver *acpi_drv = acpi_dev->driver;
 379
 380         if (acpi_drv) {
 381                 if (acpi_drv->ops.stop)
 382                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 383                 if (acpi_drv->ops.remove)
 384                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 385         }
 386         acpi_dev->driver = NULL;
 387         acpi_driver_data(dev) = NULL;
 388
 389         put_device(dev);
 390         return 0;
 391 }
 392
 393 static void acpi_device_shutdown(struct device *dev)
 394 {
 395         struct acpi_device *acpi_dev = to_acpi_device(dev);
 396         struct acpi_driver *acpi_drv = acpi_dev->driver;
 397
 398         if (acpi_drv && acpi_drv->ops.shutdown)
 399                 acpi_drv->ops.shutdown(acpi_dev);
 400
 401         return ;
 402 }
 403
 404 struct bus_type acpi_bus_type = {
 405         .name           = "acpi",
 406         .suspend        = acpi_device_suspend,
 407         .resume         = acpi_device_resume,
 408         .shutdown       = acpi_device_shutdown,
 409         .match          = acpi_bus_match,
 410         .probe          = acpi_device_probe,
 411         .remove         = acpi_device_remove,
 412         .uevent         = acpi_device_uevent,
 413 };
 414
 415 static int acpi_device_register(struct acpi_device *device,
 416                                  struct acpi_device *parent)
 417 {
 418         int result;
 419         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 420         int found = 0;
 421         /*
 422          * Linkage
 423          * -------
 424          * Link this device to its parent and siblings.
 425          */
 426         INIT_LIST_HEAD(&device->children);
 427         INIT_LIST_HEAD(&device->node);
 428         INIT_LIST_HEAD(&device->g_list);
 429         INIT_LIST_HEAD(&device->wakeup_list);
 430
 431         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 432         if (!new_bus_id) {
 433                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 434                 return -ENOMEM;
 435         }
 436
 437         spin_lock(&acpi_device_lock);
 438         /*
 439          * Find suitable bus_id and instance number in acpi_bus_id_list
 440          * If failed, create one and link it into acpi_bus_id_list
 441          */
 442         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 443                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 444                         acpi_device_bus_id->instance_no ++;
 445                         found = 1;
 446                         kfree(new_bus_id);
 447                         break;
 448                 }
 449         }
 450         if(!found) {
 451                 acpi_device_bus_id = new_bus_id;
 452                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 453                 acpi_device_bus_id->instance_no = 0;
 454                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 455         }
 456         sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 457
 458         if (device->parent) {
 459                 list_add_tail(&device->node, &device->parent->children);
 460                 list_add_tail(&device->g_list, &device->parent->g_list);
 461         } else
 462                 list_add_tail(&device->g_list, &acpi_device_list);
 463         if (device->wakeup.flags.valid)
 464                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 465         spin_unlock(&acpi_device_lock);
 466
 467         if (device->parent)
 468                 device->dev.parent = &parent->dev;
 469         device->dev.bus = &acpi_bus_type;
 470         device_initialize(&device->dev);
 471         device->dev.release = &acpi_device_release;
 472         result = device_add(&device->dev);
 473         if(result) {
 474                 printk(KERN_ERR PREFIX "Error adding device %s", device->dev.bus_id);
 475                 goto end;
 476         }
 477
 478         result = acpi_device_setup_files(device);
 479         if(result)
 480                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
 481
 482         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 483         return 0;
 484   end:
 485         spin_lock(&acpi_device_lock);
 486         if (device->parent) {
 487                 list_del(&device->node);
 488                 list_del(&device->g_list);
 489         } else
 490                 list_del(&device->g_list);
 491         list_del(&device->wakeup_list);
 492         spin_unlock(&acpi_device_lock);
 493         return result;
 494 }
 495
 496 static void acpi_device_unregister(struct acpi_device *device, int type)
 497 {
 498         spin_lock(&acpi_device_lock);
 499         if (device->parent) {
 500                 list_del(&device->node);
 501                 list_del(&device->g_list);
 502         } else
 503                 list_del(&device->g_list);
 504
 505         list_del(&device->wakeup_list);
 506         spin_unlock(&acpi_device_lock);
 507
 508         acpi_detach_data(device->handle, acpi_bus_data_handler);
 509
 510         acpi_device_remove_files(device);
 511         device_unregister(&device->dev);
 512 }
 513
 514 /* --------------------------------------------------------------------------
 515                                  Driver Management
 516    -------------------------------------------------------------------------- */
 517 /**
 518  * acpi_bus_driver_init - add a device to a driver
 519  * @device: the device to add and initialize
 520  * @driver: driver for the device
 521  *
 522  * Used to initialize a device via its device driver.  Called whenever a
 523  * driver is bound to a device.  Invokes the driver's add() ops.
 524  */
 525 static int
 526 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 527 {
 528         int result = 0;
 529
 530
 531         if (!device || !driver)
 532                 return -EINVAL;
 533
 534         if (!driver->ops.add)
 535                 return -ENOSYS;
 536
 537         result = driver->ops.add(device);
 538         if (result) {
 539                 device->driver = NULL;
 540                 acpi_driver_data(device) = NULL;
 541                 return result;
 542         }
 543
 544         device->driver = driver;
 545
 546         /*
 547          * TBD - Configuration Management: Assign resources to device based
 548          * upon possible configuration and currently allocated resources.
 549          */
 550
 551         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 552                           "Driver successfully bound to device\n"));
 553         return 0;
 554 }
 555
 556 static int acpi_start_single_object(struct acpi_device *device)
 557 {
 558         int result = 0;
 559         struct acpi_driver *driver;
 560
 561
 562         if (!(driver = device->driver))
 563                 return 0;
 564
 565         if (driver->ops.start) {
 566                 result = driver->ops.start(device);
 567                 if (result && driver->ops.remove)
 568                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 569         }
 570
 571         return result;
 572 }
 573
 574 /**
 575  * acpi_bus_register_driver - register a driver with the ACPI bus
 576  * @driver: driver being registered
 577  *
 578  * Registers a driver with the ACPI bus.  Searches the namespace for all
 579  * devices that match the driver's criteria and binds.  Returns zero for
 580  * success or a negative error status for failure.
 581  */
 582 int acpi_bus_register_driver(struct acpi_driver *driver)
 583 {
 584         int ret;
 585
 586         if (acpi_disabled)
 587                 return -ENODEV;
 588         driver->drv.name = driver->name;
 589         driver->drv.bus = &acpi_bus_type;
 590         driver->drv.owner = driver->owner;
 591
 592         ret = driver_register(&driver->drv);
 593         return ret;
 594 }
 595
 596 EXPORT_SYMBOL(acpi_bus_register_driver);
 597
 598 /**
 599  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 600  * @driver: driver to unregister
 601  *
 602  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 603  * devices that match the driver's criteria and unbinds.
 604  */
 605 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 606 {
 607         driver_unregister(&driver->drv);
 608 }
 609
 610 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 611
 612 /* --------------------------------------------------------------------------
 613                                  Device Enumeration
 614    -------------------------------------------------------------------------- */
 615 acpi_status
 616 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 617 {
 618         acpi_status status;
 619         acpi_handle tmp;
 620         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 621         union acpi_object *obj;
 622
 623         status = acpi_get_handle(handle, "_EJD", &tmp);
 624         if (ACPI_FAILURE(status))
 625                 return status;
 626
 627         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 628         if (ACPI_SUCCESS(status)) {
 629                 obj = buffer.pointer;
 630                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 631                                          ejd);
 632                 kfree(buffer.pointer);
 633         }
 634         return status;
 635 }
 636 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 637
 638 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 639 {
 640
 641         /* TBD */
 642
 643         return;
 644 }
 645
 646 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 647 {
 648         device->performance.state = ACPI_STATE_UNKNOWN;
 649         return 0;
 650 }
 651
 652 static acpi_status
 653 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 654                                              union acpi_object *package)
 655 {
 656         int i = 0;
 657         union acpi_object *element = NULL;
 658
 659         if (!device || !package || (package->package.count < 2))
 660                 return AE_BAD_PARAMETER;
 661
 662         element = &(package->package.elements[0]);
 663         if (!element)
 664                 return AE_BAD_PARAMETER;
 665         if (element->type == ACPI_TYPE_PACKAGE) {
 666                 if ((element->package.count < 2) ||
 667                     (element->package.elements[0].type !=
 668                      ACPI_TYPE_LOCAL_REFERENCE)
 669                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 670                         return AE_BAD_DATA;
 671                 device->wakeup.gpe_device =
 672                     element->package.elements[0].reference.handle;
 673                 device->wakeup.gpe_number =
 674                     (u32) element->package.elements[1].integer.value;
 675         } else if (element->type == ACPI_TYPE_INTEGER) {
 676                 device->wakeup.gpe_number = element->integer.value;
 677         } else
 678                 return AE_BAD_DATA;
 679
 680         element = &(package->package.elements[1]);
 681         if (element->type != ACPI_TYPE_INTEGER) {
 682                 return AE_BAD_DATA;
 683         }
 684         device->wakeup.sleep_state = element->integer.value;
 685
 686         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 687                 return AE_NO_MEMORY;
 688         }
 689         device->wakeup.resources.count = package->package.count - 2;
 690         for (i = 0; i < device->wakeup.resources.count; i++) {
 691                 element = &(package->package.elements[i + 2]);
 692                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 693                         return AE_BAD_DATA;
 694
 695                 device->wakeup.resources.handles[i] = element->reference.handle;
 696         }
 697
 698         return AE_OK;
 699 }
 700
 701 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 702 {
 703         acpi_status status = 0;
 704         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 705         union acpi_object *package = NULL;
 706         union acpi_object in_arg[3];
 707         struct acpi_object_list arg_list = { 3, in_arg };
 708         acpi_status psw_status = AE_OK;
 709
 710         struct acpi_device_id button_device_ids[] = {
 711                 {"PNP0C0D", 0},
 712                 {"PNP0C0C", 0},
 713                 {"PNP0C0E", 0},
 714                 {"", 0},
 715         };
 716
 717         /* _PRW */
 718         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 719         if (ACPI_FAILURE(status)) {
 720                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 721                 goto end;
 722         }
 723
 724         package = (union acpi_object *)buffer.pointer;
 725         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 726         if (ACPI_FAILURE(status)) {
 727                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 728                 goto end;
 729         }
 730
 731         kfree(buffer.pointer);
 732
 733         device->wakeup.flags.valid = 1;
 734         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 735          * system for the ACPI device with the _PRW object.
 736          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 737          * So it is necessary to call _DSW object first. Only when it is not
 738          * present will the _PSW object used.
 739          */
 740         /*
 741          * Three agruments are needed for the _DSW object.
 742          * Argument 0: enable/disable the wake capabilities
 743          * When _DSW object is called to disable the wake capabilities, maybe
 744          * the first argument is filled. The value of the other two agruments
 745          * is meaningless.
 746          */
 747         in_arg[0].type = ACPI_TYPE_INTEGER;
 748         in_arg[0].integer.value = 0;
 749         in_arg[1].type = ACPI_TYPE_INTEGER;
 750         in_arg[1].integer.value = 0;
 751         in_arg[2].type = ACPI_TYPE_INTEGER;
 752         in_arg[2].integer.value = 0;
 753         psw_status = acpi_evaluate_object(device->handle, "_DSW",
 754                                                 &arg_list, NULL);
 755         if (ACPI_FAILURE(psw_status) && (psw_status != AE_NOT_FOUND))
 756                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "error in evaluate _DSW\n"));
 757         /*
 758          * When the _DSW object is not present, OSPM will call _PSW object.
 759          */
 760         if (psw_status == AE_NOT_FOUND) {
 761                 /*
 762                  * Only one agruments is required for the _PSW object.
 763                  * agrument 0: enable/disable the wake capabilities
 764                  */
 765                 arg_list.count = 1;
 766                 in_arg[0].integer.value = 0;
 767                 psw_status = acpi_evaluate_object(device->handle, "_PSW",
 768                                                 &arg_list, NULL);
 769                 if (ACPI_FAILURE(psw_status) && (psw_status != AE_NOT_FOUND))
 770                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "error in "
 771                                                 "evaluate _PSW\n"));
 772         }
 773         /* Power button, Lid switch always enable wakeup */
 774         if (!acpi_match_device_ids(device, button_device_ids))
 775                 device->wakeup.flags.run_wake = 1;
 776
 777       end:
 778         if (ACPI_FAILURE(status))
 779                 device->flags.wake_capable = 0;
 780         return 0;
 781 }
 782
 783 static int acpi_bus_get_power_flags(struct acpi_device *device)
 784 {
 785         acpi_status status = 0;
 786         acpi_handle handle = NULL;
 787         u32 i = 0;
 788
 789
 790         /*
 791          * Power Management Flags
 792          */
 793         status = acpi_get_handle(device->handle, "_PSC", &handle);
 794         if (ACPI_SUCCESS(status))
 795                 device->power.flags.explicit_get = 1;
 796         status = acpi_get_handle(device->handle, "_IRC", &handle);
 797         if (ACPI_SUCCESS(status))
 798                 device->power.flags.inrush_current = 1;
 799
 800         /*
 801          * Enumerate supported power management states
 802          */
 803         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 804                 struct acpi_device_power_state *ps = &device->power.states[i];
 805                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 806
 807                 /* Evaluate "_PRx" to se if power resources are referenced */
 808                 acpi_evaluate_reference(device->handle, object_name, NULL,
 809                                         &ps->resources);
 810                 if (ps->resources.count) {
 811                         device->power.flags.power_resources = 1;
 812                         ps->flags.valid = 1;
 813                 }
 814
 815                 /* Evaluate "_PSx" to see if we can do explicit sets */
 816                 object_name[2] = 'S';
 817                 status = acpi_get_handle(device->handle, object_name, &handle);
 818                 if (ACPI_SUCCESS(status)) {
 819                         ps->flags.explicit_set = 1;
 820                         ps->flags.valid = 1;
 821                 }
 822
 823                 /* State is valid if we have some power control */
 824                 if (ps->resources.count || ps->flags.explicit_set)
 825                         ps->flags.valid = 1;
 826
 827                 ps->power = -1; /* Unknown - driver assigned */
 828                 ps->latency = -1;       /* Unknown - driver assigned */
 829         }
 830
 831         /* Set defaults for D0 and D3 states (always valid) */
 832         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 833         device->power.states[ACPI_STATE_D0].power = 100;
 834         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 835         device->power.states[ACPI_STATE_D3].power = 0;
 836
 837         /* TBD: System wake support and resource requirements. */
 838
 839         device->power.state = ACPI_STATE_UNKNOWN;
 840
 841         return 0;
 842 }
 843
 844 static int acpi_bus_get_flags(struct acpi_device *device)
 845 {
 846         acpi_status status = AE_OK;
 847         acpi_handle temp = NULL;
 848
 849
 850         /* Presence of _STA indicates 'dynamic_status' */
 851         status = acpi_get_handle(device->handle, "_STA", &temp);
 852         if (ACPI_SUCCESS(status))
 853                 device->flags.dynamic_status = 1;
 854
 855         /* Presence of _CID indicates 'compatible_ids' */
 856         status = acpi_get_handle(device->handle, "_CID", &temp);
 857         if (ACPI_SUCCESS(status))
 858                 device->flags.compatible_ids = 1;
 859
 860         /* Presence of _RMV indicates 'removable' */
 861         status = acpi_get_handle(device->handle, "_RMV", &temp);
 862         if (ACPI_SUCCESS(status))
 863                 device->flags.removable = 1;
 864
 865         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 866         status = acpi_get_handle(device->handle, "_EJD", &temp);
 867         if (ACPI_SUCCESS(status))
 868                 device->flags.ejectable = 1;
 869         else {
 870                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 871                 if (ACPI_SUCCESS(status))
 872                         device->flags.ejectable = 1;
 873         }
 874
 875         /* Presence of _LCK indicates 'lockable' */
 876         status = acpi_get_handle(device->handle, "_LCK", &temp);
 877         if (ACPI_SUCCESS(status))
 878                 device->flags.lockable = 1;
 879
 880         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 881         status = acpi_get_handle(device->handle, "_PS0", &temp);
 882         if (ACPI_FAILURE(status))
 883                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 884         if (ACPI_SUCCESS(status))
 885                 device->flags.power_manageable = 1;
 886
 887         /* Presence of _PRW indicates wake capable */
 888         status = acpi_get_handle(device->handle, "_PRW", &temp);
 889         if (ACPI_SUCCESS(status))
 890                 device->flags.wake_capable = 1;
 891
 892         /* TBD: Performance management */
 893
 894         return 0;
 895 }
 896
 897 static void acpi_device_get_busid(struct acpi_device *device,
 898                                   acpi_handle handle, int type)
 899 {
 900         char bus_id[5] = { '?', 0 };
 901         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 902         int i = 0;
 903
 904         /*
 905          * Bus ID
 906          * ------
 907          * The device's Bus ID is simply the object name.
 908          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 909          */
 910         switch (type) {
 911         case ACPI_BUS_TYPE_SYSTEM:
 912                 strcpy(device->pnp.bus_id, "ACPI");
 913                 break;
 914         case ACPI_BUS_TYPE_POWER_BUTTON:
 915                 strcpy(device->pnp.bus_id, "PWRF");
 916                 break;
 917         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 918                 strcpy(device->pnp.bus_id, "SLPF");
 919                 break;
 920         default:
 921                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 922                 /* Clean up trailing underscores (if any) */
 923                 for (i = 3; i > 1; i--) {
 924                         if (bus_id[i] == '_')
 925                                 bus_id[i] = '\0';
 926                         else
 927                                 break;
 928                 }
 929                 strcpy(device->pnp.bus_id, bus_id);
 930                 break;
 931         }
 932 }
 933
 934 static int
 935 acpi_video_bus_match(struct acpi_device *device)
 936 {
 937         acpi_handle h_dummy;
 938
 939         if (!device)
 940                 return -EINVAL;
 941
 942         /* Since there is no HID, CID for ACPI Video drivers, we have
 943          * to check well known required nodes for each feature we support.
 944          */
 945
 946         /* Does this device able to support video switching ? */
 947         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) &&
 948             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
 949                 return 0;
 950
 951         /* Does this device able to retrieve a video ROM ? */
 952         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
 953                 return 0;
 954
 955         /* Does this device able to configure which video head to be POSTed ? */
 956         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) &&
 957             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) &&
 958             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy)))
 959                 return 0;
 960
 961         return -ENODEV;
 962 }
 963
 964 /*
 965  * acpi_bay_match - see if a device is an ejectable driver bay
 966  *
 967  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 968  * then we can safely call it an ejectable drive bay
 969  */
 970 static int acpi_bay_match(struct acpi_device *device){
 971         acpi_status status;
 972         acpi_handle handle;
 973         acpi_handle tmp;
 974         acpi_handle phandle;
 975
 976         handle = device->handle;
 977
 978         status = acpi_get_handle(handle, "_EJ0", &tmp);
 979         if (ACPI_FAILURE(status))
 980                 return -ENODEV;
 981
 982         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 983                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 984                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 985                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 986                 return 0;
 987
 988         if (acpi_get_parent(handle, &phandle))
 989                 return -ENODEV;
 990
 991         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 992                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 993                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 994                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 995                 return 0;
 996
 997         return -ENODEV;
 998 }
 999
1000 /*
1001  * acpi_dock_match - see if a device has a _DCK method
1002  */
1003 static int acpi_dock_match(struct acpi_device *device)
1004 {
1005         acpi_handle tmp;
1006         return acpi_get_handle(device->handle, "_DCK", &tmp);
1007 }
1008
1009 static void acpi_device_set_id(struct acpi_device *device,
1010                                struct acpi_device *parent, acpi_handle handle,
1011                                int type)
1012 {
1013         struct acpi_device_info *info;
1014         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1015         char *hid = NULL;
1016         char *uid = NULL;
1017         struct acpi_compatible_id_list *cid_list = NULL;
1018         const char *cid_add = NULL;
1019         acpi_status status;
1020
1021         switch (type) {
1022         case ACPI_BUS_TYPE_DEVICE:
1023                 status = acpi_get_object_info(handle, &buffer);
1024                 if (ACPI_FAILURE(status)) {
1025                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1026                         return;
1027                 }
1028
1029                 info = buffer.pointer;
1030                 if (info->valid & ACPI_VALID_HID)
1031                         hid = info->hardware_id.value;
1032                 if (info->valid & ACPI_VALID_UID)
1033                         uid = info->unique_id.value;
1034                 if (info->valid & ACPI_VALID_CID)
1035                         cid_list = &info->compatibility_id;
1036                 if (info->valid & ACPI_VALID_ADR) {
1037                         device->pnp.bus_address = info->address;
1038                         device->flags.bus_address = 1;
1039                 }
1040
1041                 /* If we have a video/bay/dock device, add our selfdefined
1042                    HID to the CID list. Like that the video/bay/dock drivers
1043                    will get autoloaded and the device might still match
1044                    against another driver.
1045                 */
1046                 if (ACPI_SUCCESS(acpi_video_bus_match(device)))
1047                         cid_add = ACPI_VIDEO_HID;
1048                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1049                         cid_add = ACPI_BAY_HID;
1050                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1051                         cid_add = ACPI_DOCK_HID;
1052
1053                 break;
1054         case ACPI_BUS_TYPE_POWER:
1055                 hid = ACPI_POWER_HID;
1056                 break;
1057         case ACPI_BUS_TYPE_PROCESSOR:
1058                 hid = ACPI_PROCESSOR_HID;
1059                 break;
1060         case ACPI_BUS_TYPE_SYSTEM:
1061                 hid = ACPI_SYSTEM_HID;
1062                 break;
1063         case ACPI_BUS_TYPE_THERMAL:
1064                 hid = ACPI_THERMAL_HID;
1065                 break;
1066         case ACPI_BUS_TYPE_POWER_BUTTON:
1067                 hid = ACPI_BUTTON_HID_POWERF;
1068                 break;
1069         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1070                 hid = ACPI_BUTTON_HID_SLEEPF;
1071                 break;
1072         }
1073
1074         /*
1075          * \_SB
1076          * ----
1077          * Fix for the system root bus device -- the only root-level device.
1078          */
1079         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1080                 hid = ACPI_BUS_HID;
1081                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1082                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1083         }
1084
1085         if (hid) {
1086                 strcpy(device->pnp.hardware_id, hid);
1087                 device->flags.hardware_id = 1;
1088         }
1089         if (uid) {
1090                 strcpy(device->pnp.unique_id, uid);
1091                 device->flags.unique_id = 1;
1092         }
1093         if (cid_list || cid_add) {
1094                 struct  acpi_compatible_id_list *list;
1095                 int size = 0;
1096                 int count = 0;
1097
1098                 if (cid_list) {
1099                         size = cid_list->size;
1100                 } else if (cid_add) {
1101                         size = sizeof(struct acpi_compatible_id_list);
1102                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1103                         if (!cid_list) {
1104                                 printk(KERN_ERR "Memory allocation error\n");
1105                                 kfree(buffer.pointer);
1106                                 return;
1107                         } else {
1108                                 cid_list->count = 0;
1109                                 cid_list->size = size;
1110                         }
1111                 }
1112                 if (cid_add)
1113                         size += sizeof(struct acpi_compatible_id);
1114                 list = kmalloc(size, GFP_KERNEL);
1115
1116                 if (list) {
1117                         if (cid_list) {
1118                                 memcpy(list, cid_list, cid_list->size);
1119                                 count = cid_list->count;
1120                         }
1121                         if (cid_add) {
1122                                 strncpy(list->id[count].value, cid_add,
1123                                         ACPI_MAX_CID_LENGTH);
1124                                 count++;
1125                                 device->flags.compatible_ids = 1;
1126                         }
1127                         list->size = size;
1128                         list->count = count;
1129                         device->pnp.cid_list = list;
1130                 } else
1131                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1132         }
1133
1134         kfree(buffer.pointer);
1135 }
1136
1137 static int acpi_device_set_context(struct acpi_device *device, int type)
1138 {
1139         acpi_status status = AE_OK;
1140         int result = 0;
1141         /*
1142          * Context
1143          * -------
1144          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1145          * resolutions from handle->device very efficient.  Note that we need
1146          * to be careful with fixed-feature devices as they all attach to the
1147          * root object.
1148          */
1149         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1150             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1151                 status = acpi_attach_data(device->handle,
1152                                           acpi_bus_data_handler, device);
1153
1154                 if (ACPI_FAILURE(status)) {
1155                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1156                         result = -ENODEV;
1157                 }
1158         }
1159         return result;
1160 }
1161
1162 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1163 {
1164         if (!dev)
1165                 return -EINVAL;
1166
1167         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1168         device_release_driver(&dev->dev);
1169
1170         if (!rmdevice)
1171                 return 0;
1172
1173         /*
1174          * unbind _ADR-Based Devices when hot removal
1175          */
1176         if (dev->flags.bus_address) {
1177                 if ((dev->parent) && (dev->parent->ops.unbind))
1178                         dev->parent->ops.unbind(dev);
1179         }
1180         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1181
1182         return 0;
1183 }
1184
1185 static int
1186 acpi_is_child_device(struct acpi_device *device,
1187                         int (*matcher)(struct acpi_device *))
1188 {
1189         int result = -ENODEV;
1190
1191         do {
1192                 if (ACPI_SUCCESS(matcher(device)))
1193                         return AE_OK;
1194         } while ((device = device->parent));
1195
1196         return result;
1197 }
1198
1199 static int
1200 acpi_add_single_object(struct acpi_device **child,
1201                        struct acpi_device *parent, acpi_handle handle, int type,
1202                         struct acpi_bus_ops *ops)
1203 {
1204         int result = 0;
1205         struct acpi_device *device = NULL;
1206
1207
1208         if (!child)
1209                 return -EINVAL;
1210
1211         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1212         if (!device) {
1213                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1214                 return -ENOMEM;
1215         }
1216
1217         device->handle = handle;
1218         device->parent = parent;
1219         device->bus_ops = *ops; /* workround for not call .start */
1220
1221
1222         acpi_device_get_busid(device, handle, type);
1223
1224         /*
1225          * Flags
1226          * -----
1227          * Get prior to calling acpi_bus_get_status() so we know whether
1228          * or not _STA is present.  Note that we only look for object
1229          * handles -- cannot evaluate objects until we know the device is
1230          * present and properly initialized.
1231          */
1232         result = acpi_bus_get_flags(device);
1233         if (result)
1234                 goto end;
1235
1236         /*
1237          * Status
1238          * ------
1239          * See if the device is present.  We always assume that non-Device
1240          * and non-Processor objects (e.g. thermal zones, power resources,
1241          * etc.) are present, functioning, etc. (at least when parent object
1242          * is present).  Note that _STA has a different meaning for some
1243          * objects (e.g. power resources) so we need to be careful how we use
1244          * it.
1245          */
1246         switch (type) {
1247         case ACPI_BUS_TYPE_PROCESSOR:
1248         case ACPI_BUS_TYPE_DEVICE:
1249                 result = acpi_bus_get_status(device);
1250                 if (ACPI_FAILURE(result)) {
1251                         result = -ENODEV;
1252                         goto end;
1253                 }
1254                 if (!device->status.present) {
1255                         /* Bay and dock should be handled even if absent */
1256                         if (!ACPI_SUCCESS(
1257                              acpi_is_child_device(device, acpi_bay_match)) &&
1258                             !ACPI_SUCCESS(
1259                              acpi_is_child_device(device, acpi_dock_match))) {
1260                                         result = -ENODEV;
1261                                         goto end;
1262                         }
1263                 }
1264                 break;
1265         default:
1266                 STRUCT_TO_INT(device->status) =
1267                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1268                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1269                 break;
1270         }
1271
1272         /*
1273          * Initialize Device
1274          * -----------------
1275          * TBD: Synch with Core's enumeration/initialization process.
1276          */
1277
1278         /*
1279          * Hardware ID, Unique ID, & Bus Address
1280          * -------------------------------------
1281          */
1282         acpi_device_set_id(device, parent, handle, type);
1283
1284         /*
1285          * Power Management
1286          * ----------------
1287          */
1288         if (device->flags.power_manageable) {
1289                 result = acpi_bus_get_power_flags(device);
1290                 if (result)
1291                         goto end;
1292         }
1293
1294         /*
1295          * Wakeup device management
1296          *-----------------------
1297          */
1298         if (device->flags.wake_capable) {
1299                 result = acpi_bus_get_wakeup_device_flags(device);
1300                 if (result)
1301                         goto end;
1302         }
1303
1304         /*
1305          * Performance Management
1306          * ----------------------
1307          */
1308         if (device->flags.performance_manageable) {
1309                 result = acpi_bus_get_perf_flags(device);
1310                 if (result)
1311                         goto end;
1312         }
1313
1314         if ((result = acpi_device_set_context(device, type)))
1315                 goto end;
1316
1317         result = acpi_device_register(device, parent);
1318
1319         /*
1320          * Bind _ADR-Based Devices when hot add
1321          */
1322         if (device->flags.bus_address) {
1323                 if (device->parent && device->parent->ops.bind)
1324                         device->parent->ops.bind(device);
1325         }
1326
1327       end:
1328         if (!result)
1329                 *child = device;
1330         else {
1331                 kfree(device->pnp.cid_list);
1332                 kfree(device);
1333         }
1334
1335         return result;
1336 }
1337
1338 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1339 {
1340         acpi_status status = AE_OK;
1341         struct acpi_device *parent = NULL;
1342         struct acpi_device *child = NULL;
1343         acpi_handle phandle = NULL;
1344         acpi_handle chandle = NULL;
1345         acpi_object_type type = 0;
1346         u32 level = 1;
1347
1348
1349         if (!start)
1350                 return -EINVAL;
1351
1352         parent = start;
1353         phandle = start->handle;
1354
1355         /*
1356          * Parse through the ACPI namespace, identify all 'devices', and
1357          * create a new 'struct acpi_device' for each.
1358          */
1359         while ((level > 0) && parent) {
1360
1361                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1362                                               chandle, &chandle);
1363
1364                 /*
1365                  * If this scope is exhausted then move our way back up.
1366                  */
1367                 if (ACPI_FAILURE(status)) {
1368                         level--;
1369                         chandle = phandle;
1370                         acpi_get_parent(phandle, &phandle);
1371                         if (parent->parent)
1372                                 parent = parent->parent;
1373                         continue;
1374                 }
1375
1376                 status = acpi_get_type(chandle, &type);
1377                 if (ACPI_FAILURE(status))
1378                         continue;
1379
1380                 /*
1381                  * If this is a scope object then parse it (depth-first).
1382                  */
1383                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1384                         level++;
1385                         phandle = chandle;
1386                         chandle = NULL;
1387                         continue;
1388                 }
1389
1390                 /*
1391                  * We're only interested in objects that we consider 'devices'.
1392                  */
1393                 switch (type) {
1394                 case ACPI_TYPE_DEVICE:
1395                         type = ACPI_BUS_TYPE_DEVICE;
1396                         break;
1397                 case ACPI_TYPE_PROCESSOR:
1398                         type = ACPI_BUS_TYPE_PROCESSOR;
1399                         break;
1400                 case ACPI_TYPE_THERMAL:
1401                         type = ACPI_BUS_TYPE_THERMAL;
1402                         break;
1403                 case ACPI_TYPE_POWER:
1404                         type = ACPI_BUS_TYPE_POWER;
1405                         break;
1406                 default:
1407                         continue;
1408                 }
1409
1410                 if (ops->acpi_op_add)
1411                         status = acpi_add_single_object(&child, parent,
1412                                 chandle, type, ops);
1413                 else
1414                         status = acpi_bus_get_device(chandle, &child);
1415
1416                 if (ACPI_FAILURE(status))
1417                         continue;
1418
1419                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1420                         status = acpi_start_single_object(child);
1421                         if (ACPI_FAILURE(status))
1422                                 continue;
1423                 }
1424
1425                 /*
1426                  * If the device is present, enabled, and functioning then
1427                  * parse its scope (depth-first).  Note that we need to
1428                  * represent absent devices to facilitate PnP notifications
1429                  * -- but only the subtree head (not all of its children,
1430                  * which will be enumerated when the parent is inserted).
1431                  *
1432                  * TBD: Need notifications and other detection mechanisms
1433                  *      in place before we can fully implement this.
1434                  */
1435                 if (child->status.present) {
1436                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1437                                                       NULL, NULL);
1438                         if (ACPI_SUCCESS(status)) {
1439                                 level++;
1440                                 phandle = chandle;
1441                                 chandle = NULL;
1442                                 parent = child;
1443                         }
1444                 }
1445         }
1446
1447         return 0;
1448 }
1449
1450 int
1451 acpi_bus_add(struct acpi_device **child,
1452              struct acpi_device *parent, acpi_handle handle, int type)
1453 {
1454         int result;
1455         struct acpi_bus_ops ops;
1456
1457         memset(&ops, 0, sizeof(ops));
1458         ops.acpi_op_add = 1;
1459
1460         result = acpi_add_single_object(child, parent, handle, type, &ops);
1461         if (!result)
1462                 result = acpi_bus_scan(*child, &ops);
1463
1464         return result;
1465 }
1466
1467 EXPORT_SYMBOL(acpi_bus_add);
1468
1469 int acpi_bus_start(struct acpi_device *device)
1470 {
1471         int result;
1472         struct acpi_bus_ops ops;
1473
1474
1475         if (!device)
1476                 return -EINVAL;
1477
1478         result = acpi_start_single_object(device);
1479         if (!result) {
1480                 memset(&ops, 0, sizeof(ops));
1481                 ops.acpi_op_start = 1;
1482                 result = acpi_bus_scan(device, &ops);
1483         }
1484         return result;
1485 }
1486
1487 EXPORT_SYMBOL(acpi_bus_start);
1488
1489 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1490 {
1491         acpi_status status;
1492         struct acpi_device *parent, *child;
1493         acpi_handle phandle, chandle;
1494         acpi_object_type type;
1495         u32 level = 1;
1496         int err = 0;
1497
1498         parent = start;
1499         phandle = start->handle;
1500         child = chandle = NULL;
1501
1502         while ((level > 0) && parent && (!err)) {
1503                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1504                                               chandle, &chandle);
1505
1506                 /*
1507                  * If this scope is exhausted then move our way back up.
1508                  */
1509                 if (ACPI_FAILURE(status)) {
1510                         level--;
1511                         chandle = phandle;
1512                         acpi_get_parent(phandle, &phandle);
1513                         child = parent;
1514                         parent = parent->parent;
1515
1516                         if (level == 0)
1517                                 err = acpi_bus_remove(child, rmdevice);
1518                         else
1519                                 err = acpi_bus_remove(child, 1);
1520
1521                         continue;
1522                 }
1523
1524                 status = acpi_get_type(chandle, &type);
1525                 if (ACPI_FAILURE(status)) {
1526                         continue;
1527                 }
1528                 /*
1529                  * If there is a device corresponding to chandle then
1530                  * parse it (depth-first).
1531                  */
1532                 if (acpi_bus_get_device(chandle, &child) == 0) {
1533                         level++;
1534                         phandle = chandle;
1535                         chandle = NULL;
1536                         parent = child;
1537                 }
1538                 continue;
1539         }
1540         return err;
1541 }
1542 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1543
1544
1545 static int acpi_bus_scan_fixed(struct acpi_device *root)
1546 {
1547         int result = 0;
1548         struct acpi_device *device = NULL;
1549         struct acpi_bus_ops ops;
1550
1551         if (!root)
1552                 return -ENODEV;
1553
1554         memset(&ops, 0, sizeof(ops));
1555         ops.acpi_op_add = 1;
1556         ops.acpi_op_start = 1;
1557
1558         /*
1559          * Enumerate all fixed-feature devices.
1560          */
1561         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1562                 result = acpi_add_single_object(&device, acpi_root,
1563                                                 NULL,
1564                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1565                                                 &ops);
1566         }
1567
1568         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1569                 result = acpi_add_single_object(&device, acpi_root,
1570                                                 NULL,
1571                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1572                                                 &ops);
1573         }
1574
1575         return result;
1576 }
1577
1578 int __init acpi_boot_ec_enable(void);
1579
1580 static int __init acpi_scan_init(void)
1581 {
1582         int result;
1583         struct acpi_bus_ops ops;
1584
1585
1586         if (acpi_disabled)
1587                 return 0;
1588
1589         memset(&ops, 0, sizeof(ops));
1590         ops.acpi_op_add = 1;
1591         ops.acpi_op_start = 1;
1592
1593         result = bus_register(&acpi_bus_type);
1594         if (result) {
1595                 /* We don't want to quit even if we failed to add suspend/resume */
1596                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1597         }
1598
1599         /*
1600          * Create the root device in the bus's device tree
1601          */
1602         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1603                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1604         if (result)
1605                 goto Done;
1606
1607         /*
1608          * Enumerate devices in the ACPI namespace.
1609          */
1610         result = acpi_bus_scan_fixed(acpi_root);
1611
1612         /* EC region might be needed at bus_scan, so enable it now */
1613         acpi_boot_ec_enable();
1614
1615         if (!result)
1616                 result = acpi_bus_scan(acpi_root, &ops);
1617
1618         if (result)
1619                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1620
1621       Done:
1622         return result;
1623 }
1624
1625 subsys_initcall(acpi_scan_init);