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                 dev_err(&device->dev, "Error adding device\n");
 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         int psw_error;
 707
 708         struct acpi_device_id button_device_ids[] = {
 709                 {"PNP0C0D", 0},
 710                 {"PNP0C0C", 0},
 711                 {"PNP0C0E", 0},
 712                 {"", 0},
 713         };
 714
 715         /* _PRW */
 716         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 717         if (ACPI_FAILURE(status)) {
 718                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 719                 goto end;
 720         }
 721
 722         package = (union acpi_object *)buffer.pointer;
 723         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 724         if (ACPI_FAILURE(status)) {
 725                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 726                 goto end;
 727         }
 728
 729         kfree(buffer.pointer);
 730
 731         device->wakeup.flags.valid = 1;
 732         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 733          * system for the ACPI device with the _PRW object.
 734          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 735          * So it is necessary to call _DSW object first. Only when it is not
 736          * present will the _PSW object used.
 737          */
 738         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 739         if (psw_error)
 740                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 741                                 "error in _DSW or _PSW evaluation\n"));
 742
 743         /* Power button, Lid switch always enable wakeup */
 744         if (!acpi_match_device_ids(device, button_device_ids))
 745                 device->wakeup.flags.run_wake = 1;
 746
 747         /*
 748          * Don't set Power button GPE as run_wake
 749          * if Fixed Power button is used
 750          */
 751         if (!strcmp(device->pnp.hardware_id, "PNP0C0C") &&
 752                 !(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
 753                 device->wakeup.flags.run_wake = 0;
 754                 device->wakeup.flags.valid = 0;
 755         }
 756
 757       end:
 758         if (ACPI_FAILURE(status))
 759                 device->flags.wake_capable = 0;
 760         return 0;
 761 }
 762
 763 static int acpi_bus_get_power_flags(struct acpi_device *device)
 764 {
 765         acpi_status status = 0;
 766         acpi_handle handle = NULL;
 767         u32 i = 0;
 768
 769
 770         /*
 771          * Power Management Flags
 772          */
 773         status = acpi_get_handle(device->handle, "_PSC", &handle);
 774         if (ACPI_SUCCESS(status))
 775                 device->power.flags.explicit_get = 1;
 776         status = acpi_get_handle(device->handle, "_IRC", &handle);
 777         if (ACPI_SUCCESS(status))
 778                 device->power.flags.inrush_current = 1;
 779
 780         /*
 781          * Enumerate supported power management states
 782          */
 783         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 784                 struct acpi_device_power_state *ps = &device->power.states[i];
 785                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 786
 787                 /* Evaluate "_PRx" to se if power resources are referenced */
 788                 acpi_evaluate_reference(device->handle, object_name, NULL,
 789                                         &ps->resources);
 790                 if (ps->resources.count) {
 791                         device->power.flags.power_resources = 1;
 792                         ps->flags.valid = 1;
 793                 }
 794
 795                 /* Evaluate "_PSx" to see if we can do explicit sets */
 796                 object_name[2] = 'S';
 797                 status = acpi_get_handle(device->handle, object_name, &handle);
 798                 if (ACPI_SUCCESS(status)) {
 799                         ps->flags.explicit_set = 1;
 800                         ps->flags.valid = 1;
 801                 }
 802
 803                 /* State is valid if we have some power control */
 804                 if (ps->resources.count || ps->flags.explicit_set)
 805                         ps->flags.valid = 1;
 806
 807                 ps->power = -1; /* Unknown - driver assigned */
 808                 ps->latency = -1;       /* Unknown - driver assigned */
 809         }
 810
 811         /* Set defaults for D0 and D3 states (always valid) */
 812         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 813         device->power.states[ACPI_STATE_D0].power = 100;
 814         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 815         device->power.states[ACPI_STATE_D3].power = 0;
 816
 817         /* TBD: System wake support and resource requirements. */
 818
 819         device->power.state = ACPI_STATE_UNKNOWN;
 820
 821         return 0;
 822 }
 823
 824 static int acpi_bus_get_flags(struct acpi_device *device)
 825 {
 826         acpi_status status = AE_OK;
 827         acpi_handle temp = NULL;
 828
 829
 830         /* Presence of _STA indicates 'dynamic_status' */
 831         status = acpi_get_handle(device->handle, "_STA", &temp);
 832         if (ACPI_SUCCESS(status))
 833                 device->flags.dynamic_status = 1;
 834
 835         /* Presence of _CID indicates 'compatible_ids' */
 836         status = acpi_get_handle(device->handle, "_CID", &temp);
 837         if (ACPI_SUCCESS(status))
 838                 device->flags.compatible_ids = 1;
 839
 840         /* Presence of _RMV indicates 'removable' */
 841         status = acpi_get_handle(device->handle, "_RMV", &temp);
 842         if (ACPI_SUCCESS(status))
 843                 device->flags.removable = 1;
 844
 845         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 846         status = acpi_get_handle(device->handle, "_EJD", &temp);
 847         if (ACPI_SUCCESS(status))
 848                 device->flags.ejectable = 1;
 849         else {
 850                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 851                 if (ACPI_SUCCESS(status))
 852                         device->flags.ejectable = 1;
 853         }
 854
 855         /* Presence of _LCK indicates 'lockable' */
 856         status = acpi_get_handle(device->handle, "_LCK", &temp);
 857         if (ACPI_SUCCESS(status))
 858                 device->flags.lockable = 1;
 859
 860         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 861         status = acpi_get_handle(device->handle, "_PS0", &temp);
 862         if (ACPI_FAILURE(status))
 863                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 864         if (ACPI_SUCCESS(status))
 865                 device->flags.power_manageable = 1;
 866
 867         /* Presence of _PRW indicates wake capable */
 868         status = acpi_get_handle(device->handle, "_PRW", &temp);
 869         if (ACPI_SUCCESS(status))
 870                 device->flags.wake_capable = 1;
 871
 872         /* TBD: Performance management */
 873
 874         return 0;
 875 }
 876
 877 static void acpi_device_get_busid(struct acpi_device *device,
 878                                   acpi_handle handle, int type)
 879 {
 880         char bus_id[5] = { '?', 0 };
 881         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 882         int i = 0;
 883
 884         /*
 885          * Bus ID
 886          * ------
 887          * The device's Bus ID is simply the object name.
 888          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 889          */
 890         switch (type) {
 891         case ACPI_BUS_TYPE_SYSTEM:
 892                 strcpy(device->pnp.bus_id, "ACPI");
 893                 break;
 894         case ACPI_BUS_TYPE_POWER_BUTTON:
 895                 strcpy(device->pnp.bus_id, "PWRF");
 896                 break;
 897         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 898                 strcpy(device->pnp.bus_id, "SLPF");
 899                 break;
 900         default:
 901                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 902                 /* Clean up trailing underscores (if any) */
 903                 for (i = 3; i > 1; i--) {
 904                         if (bus_id[i] == '_')
 905                                 bus_id[i] = '\0';
 906                         else
 907                                 break;
 908                 }
 909                 strcpy(device->pnp.bus_id, bus_id);
 910                 break;
 911         }
 912 }
 913
 914 static int
 915 acpi_video_bus_match(struct acpi_device *device)
 916 {
 917         acpi_handle h_dummy;
 918
 919         if (!device)
 920                 return -EINVAL;
 921
 922         /* Since there is no HID, CID for ACPI Video drivers, we have
 923          * to check well known required nodes for each feature we support.
 924          */
 925
 926         /* Does this device able to support video switching ? */
 927         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) &&
 928             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
 929                 return 0;
 930
 931         /* Does this device able to retrieve a video ROM ? */
 932         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
 933                 return 0;
 934
 935         /* Does this device able to configure which video head to be POSTed ? */
 936         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) &&
 937             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) &&
 938             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy)))
 939                 return 0;
 940
 941         return -ENODEV;
 942 }
 943
 944 /*
 945  * acpi_bay_match - see if a device is an ejectable driver bay
 946  *
 947  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 948  * then we can safely call it an ejectable drive bay
 949  */
 950 static int acpi_bay_match(struct acpi_device *device){
 951         acpi_status status;
 952         acpi_handle handle;
 953         acpi_handle tmp;
 954         acpi_handle phandle;
 955
 956         handle = device->handle;
 957
 958         status = acpi_get_handle(handle, "_EJ0", &tmp);
 959         if (ACPI_FAILURE(status))
 960                 return -ENODEV;
 961
 962         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 963                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 964                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 965                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 966                 return 0;
 967
 968         if (acpi_get_parent(handle, &phandle))
 969                 return -ENODEV;
 970
 971         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 972                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 973                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 974                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 975                 return 0;
 976
 977         return -ENODEV;
 978 }
 979
 980 /*
 981  * acpi_dock_match - see if a device has a _DCK method
 982  */
 983 static int acpi_dock_match(struct acpi_device *device)
 984 {
 985         acpi_handle tmp;
 986         return acpi_get_handle(device->handle, "_DCK", &tmp);
 987 }
 988
 989 static void acpi_device_set_id(struct acpi_device *device,
 990                                struct acpi_device *parent, acpi_handle handle,
 991                                int type)
 992 {
 993         struct acpi_device_info *info;
 994         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 995         char *hid = NULL;
 996         char *uid = NULL;
 997         struct acpi_compatible_id_list *cid_list = NULL;
 998         const char *cid_add = NULL;
 999         acpi_status status;
1000
1001         switch (type) {
1002         case ACPI_BUS_TYPE_DEVICE:
1003                 status = acpi_get_object_info(handle, &buffer);
1004                 if (ACPI_FAILURE(status)) {
1005                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1006                         return;
1007                 }
1008
1009                 info = buffer.pointer;
1010                 if (info->valid & ACPI_VALID_HID)
1011                         hid = info->hardware_id.value;
1012                 if (info->valid & ACPI_VALID_UID)
1013                         uid = info->unique_id.value;
1014                 if (info->valid & ACPI_VALID_CID)
1015                         cid_list = &info->compatibility_id;
1016                 if (info->valid & ACPI_VALID_ADR) {
1017                         device->pnp.bus_address = info->address;
1018                         device->flags.bus_address = 1;
1019                 }
1020
1021                 /* If we have a video/bay/dock device, add our selfdefined
1022                    HID to the CID list. Like that the video/bay/dock drivers
1023                    will get autoloaded and the device might still match
1024                    against another driver.
1025                 */
1026                 if (ACPI_SUCCESS(acpi_video_bus_match(device)))
1027                         cid_add = ACPI_VIDEO_HID;
1028                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1029                         cid_add = ACPI_BAY_HID;
1030                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1031                         cid_add = ACPI_DOCK_HID;
1032
1033                 break;
1034         case ACPI_BUS_TYPE_POWER:
1035                 hid = ACPI_POWER_HID;
1036                 break;
1037         case ACPI_BUS_TYPE_PROCESSOR:
1038                 hid = ACPI_PROCESSOR_HID;
1039                 break;
1040         case ACPI_BUS_TYPE_SYSTEM:
1041                 hid = ACPI_SYSTEM_HID;
1042                 break;
1043         case ACPI_BUS_TYPE_THERMAL:
1044                 hid = ACPI_THERMAL_HID;
1045                 break;
1046         case ACPI_BUS_TYPE_POWER_BUTTON:
1047                 hid = ACPI_BUTTON_HID_POWERF;
1048                 break;
1049         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1050                 hid = ACPI_BUTTON_HID_SLEEPF;
1051                 break;
1052         }
1053
1054         /*
1055          * \_SB
1056          * ----
1057          * Fix for the system root bus device -- the only root-level device.
1058          */
1059         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1060                 hid = ACPI_BUS_HID;
1061                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1062                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1063         }
1064
1065         if (hid) {
1066                 strcpy(device->pnp.hardware_id, hid);
1067                 device->flags.hardware_id = 1;
1068         }
1069         if (uid) {
1070                 strcpy(device->pnp.unique_id, uid);
1071                 device->flags.unique_id = 1;
1072         }
1073         if (cid_list || cid_add) {
1074                 struct  acpi_compatible_id_list *list;
1075                 int size = 0;
1076                 int count = 0;
1077
1078                 if (cid_list) {
1079                         size = cid_list->size;
1080                 } else if (cid_add) {
1081                         size = sizeof(struct acpi_compatible_id_list);
1082                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1083                         if (!cid_list) {
1084                                 printk(KERN_ERR "Memory allocation error\n");
1085                                 kfree(buffer.pointer);
1086                                 return;
1087                         } else {
1088                                 cid_list->count = 0;
1089                                 cid_list->size = size;
1090                         }
1091                 }
1092                 if (cid_add)
1093                         size += sizeof(struct acpi_compatible_id);
1094                 list = kmalloc(size, GFP_KERNEL);
1095
1096                 if (list) {
1097                         if (cid_list) {
1098                                 memcpy(list, cid_list, cid_list->size);
1099                                 count = cid_list->count;
1100                         }
1101                         if (cid_add) {
1102                                 strncpy(list->id[count].value, cid_add,
1103                                         ACPI_MAX_CID_LENGTH);
1104                                 count++;
1105                                 device->flags.compatible_ids = 1;
1106                         }
1107                         list->size = size;
1108                         list->count = count;
1109                         device->pnp.cid_list = list;
1110                 } else
1111                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1112         }
1113
1114         kfree(buffer.pointer);
1115 }
1116
1117 static int acpi_device_set_context(struct acpi_device *device, int type)
1118 {
1119         acpi_status status = AE_OK;
1120         int result = 0;
1121         /*
1122          * Context
1123          * -------
1124          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1125          * resolutions from handle->device very efficient.  Note that we need
1126          * to be careful with fixed-feature devices as they all attach to the
1127          * root object.
1128          */
1129         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1130             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1131                 status = acpi_attach_data(device->handle,
1132                                           acpi_bus_data_handler, device);
1133
1134                 if (ACPI_FAILURE(status)) {
1135                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1136                         result = -ENODEV;
1137                 }
1138         }
1139         return result;
1140 }
1141
1142 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1143 {
1144         if (!dev)
1145                 return -EINVAL;
1146
1147         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1148         device_release_driver(&dev->dev);
1149
1150         if (!rmdevice)
1151                 return 0;
1152
1153         /*
1154          * unbind _ADR-Based Devices when hot removal
1155          */
1156         if (dev->flags.bus_address) {
1157                 if ((dev->parent) && (dev->parent->ops.unbind))
1158                         dev->parent->ops.unbind(dev);
1159         }
1160         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1161
1162         return 0;
1163 }
1164
1165 static int
1166 acpi_is_child_device(struct acpi_device *device,
1167                         int (*matcher)(struct acpi_device *))
1168 {
1169         int result = -ENODEV;
1170
1171         do {
1172                 if (ACPI_SUCCESS(matcher(device)))
1173                         return AE_OK;
1174         } while ((device = device->parent));
1175
1176         return result;
1177 }
1178
1179 static int
1180 acpi_add_single_object(struct acpi_device **child,
1181                        struct acpi_device *parent, acpi_handle handle, int type,
1182                         struct acpi_bus_ops *ops)
1183 {
1184         int result = 0;
1185         struct acpi_device *device = NULL;
1186
1187
1188         if (!child)
1189                 return -EINVAL;
1190
1191         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1192         if (!device) {
1193                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1194                 return -ENOMEM;
1195         }
1196
1197         device->handle = handle;
1198         device->parent = parent;
1199         device->bus_ops = *ops; /* workround for not call .start */
1200
1201
1202         acpi_device_get_busid(device, handle, type);
1203
1204         /*
1205          * Flags
1206          * -----
1207          * Get prior to calling acpi_bus_get_status() so we know whether
1208          * or not _STA is present.  Note that we only look for object
1209          * handles -- cannot evaluate objects until we know the device is
1210          * present and properly initialized.
1211          */
1212         result = acpi_bus_get_flags(device);
1213         if (result)
1214                 goto end;
1215
1216         /*
1217          * Status
1218          * ------
1219          * See if the device is present.  We always assume that non-Device
1220          * and non-Processor objects (e.g. thermal zones, power resources,
1221          * etc.) are present, functioning, etc. (at least when parent object
1222          * is present).  Note that _STA has a different meaning for some
1223          * objects (e.g. power resources) so we need to be careful how we use
1224          * it.
1225          */
1226         switch (type) {
1227         case ACPI_BUS_TYPE_PROCESSOR:
1228         case ACPI_BUS_TYPE_DEVICE:
1229                 result = acpi_bus_get_status(device);
1230                 if (ACPI_FAILURE(result)) {
1231                         result = -ENODEV;
1232                         goto end;
1233                 }
1234                 if (!device->status.present) {
1235                         /* Bay and dock should be handled even if absent */
1236                         if (!ACPI_SUCCESS(
1237                              acpi_is_child_device(device, acpi_bay_match)) &&
1238                             !ACPI_SUCCESS(
1239                              acpi_is_child_device(device, acpi_dock_match))) {
1240                                         result = -ENODEV;
1241                                         goto end;
1242                         }
1243                 }
1244                 break;
1245         default:
1246                 STRUCT_TO_INT(device->status) =
1247                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1248                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1249                 break;
1250         }
1251
1252         /*
1253          * Initialize Device
1254          * -----------------
1255          * TBD: Synch with Core's enumeration/initialization process.
1256          */
1257
1258         /*
1259          * Hardware ID, Unique ID, & Bus Address
1260          * -------------------------------------
1261          */
1262         acpi_device_set_id(device, parent, handle, type);
1263
1264         /*
1265          * Power Management
1266          * ----------------
1267          */
1268         if (device->flags.power_manageable) {
1269                 result = acpi_bus_get_power_flags(device);
1270                 if (result)
1271                         goto end;
1272         }
1273
1274         /*
1275          * Wakeup device management
1276          *-----------------------
1277          */
1278         if (device->flags.wake_capable) {
1279                 result = acpi_bus_get_wakeup_device_flags(device);
1280                 if (result)
1281                         goto end;
1282         }
1283
1284         /*
1285          * Performance Management
1286          * ----------------------
1287          */
1288         if (device->flags.performance_manageable) {
1289                 result = acpi_bus_get_perf_flags(device);
1290                 if (result)
1291                         goto end;
1292         }
1293
1294         if ((result = acpi_device_set_context(device, type)))
1295                 goto end;
1296
1297         result = acpi_device_register(device, parent);
1298
1299         /*
1300          * Bind _ADR-Based Devices when hot add
1301          */
1302         if (device->flags.bus_address) {
1303                 if (device->parent && device->parent->ops.bind)
1304                         device->parent->ops.bind(device);
1305         }
1306
1307       end:
1308         if (!result)
1309                 *child = device;
1310         else {
1311                 kfree(device->pnp.cid_list);
1312                 kfree(device);
1313         }
1314
1315         return result;
1316 }
1317
1318 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1319 {
1320         acpi_status status = AE_OK;
1321         struct acpi_device *parent = NULL;
1322         struct acpi_device *child = NULL;
1323         acpi_handle phandle = NULL;
1324         acpi_handle chandle = NULL;
1325         acpi_object_type type = 0;
1326         u32 level = 1;
1327
1328
1329         if (!start)
1330                 return -EINVAL;
1331
1332         parent = start;
1333         phandle = start->handle;
1334
1335         /*
1336          * Parse through the ACPI namespace, identify all 'devices', and
1337          * create a new 'struct acpi_device' for each.
1338          */
1339         while ((level > 0) && parent) {
1340
1341                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1342                                               chandle, &chandle);
1343
1344                 /*
1345                  * If this scope is exhausted then move our way back up.
1346                  */
1347                 if (ACPI_FAILURE(status)) {
1348                         level--;
1349                         chandle = phandle;
1350                         acpi_get_parent(phandle, &phandle);
1351                         if (parent->parent)
1352                                 parent = parent->parent;
1353                         continue;
1354                 }
1355
1356                 status = acpi_get_type(chandle, &type);
1357                 if (ACPI_FAILURE(status))
1358                         continue;
1359
1360                 /*
1361                  * If this is a scope object then parse it (depth-first).
1362                  */
1363                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1364                         level++;
1365                         phandle = chandle;
1366                         chandle = NULL;
1367                         continue;
1368                 }
1369
1370                 /*
1371                  * We're only interested in objects that we consider 'devices'.
1372                  */
1373                 switch (type) {
1374                 case ACPI_TYPE_DEVICE:
1375                         type = ACPI_BUS_TYPE_DEVICE;
1376                         break;
1377                 case ACPI_TYPE_PROCESSOR:
1378                         type = ACPI_BUS_TYPE_PROCESSOR;
1379                         break;
1380                 case ACPI_TYPE_THERMAL:
1381                         type = ACPI_BUS_TYPE_THERMAL;
1382                         break;
1383                 case ACPI_TYPE_POWER:
1384                         type = ACPI_BUS_TYPE_POWER;
1385                         break;
1386                 default:
1387                         continue;
1388                 }
1389
1390                 if (ops->acpi_op_add)
1391                         status = acpi_add_single_object(&child, parent,
1392                                 chandle, type, ops);
1393                 else
1394                         status = acpi_bus_get_device(chandle, &child);
1395
1396                 if (ACPI_FAILURE(status))
1397                         continue;
1398
1399                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1400                         status = acpi_start_single_object(child);
1401                         if (ACPI_FAILURE(status))
1402                                 continue;
1403                 }
1404
1405                 /*
1406                  * If the device is present, enabled, and functioning then
1407                  * parse its scope (depth-first).  Note that we need to
1408                  * represent absent devices to facilitate PnP notifications
1409                  * -- but only the subtree head (not all of its children,
1410                  * which will be enumerated when the parent is inserted).
1411                  *
1412                  * TBD: Need notifications and other detection mechanisms
1413                  *      in place before we can fully implement this.
1414                  */
1415                 if (child->status.present) {
1416                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1417                                                       NULL, NULL);
1418                         if (ACPI_SUCCESS(status)) {
1419                                 level++;
1420                                 phandle = chandle;
1421                                 chandle = NULL;
1422                                 parent = child;
1423                         }
1424                 }
1425         }
1426
1427         return 0;
1428 }
1429
1430 int
1431 acpi_bus_add(struct acpi_device **child,
1432              struct acpi_device *parent, acpi_handle handle, int type)
1433 {
1434         int result;
1435         struct acpi_bus_ops ops;
1436
1437         memset(&ops, 0, sizeof(ops));
1438         ops.acpi_op_add = 1;
1439
1440         result = acpi_add_single_object(child, parent, handle, type, &ops);
1441         if (!result)
1442                 result = acpi_bus_scan(*child, &ops);
1443
1444         return result;
1445 }
1446
1447 EXPORT_SYMBOL(acpi_bus_add);
1448
1449 int acpi_bus_start(struct acpi_device *device)
1450 {
1451         int result;
1452         struct acpi_bus_ops ops;
1453
1454
1455         if (!device)
1456                 return -EINVAL;
1457
1458         result = acpi_start_single_object(device);
1459         if (!result) {
1460                 memset(&ops, 0, sizeof(ops));
1461                 ops.acpi_op_start = 1;
1462                 result = acpi_bus_scan(device, &ops);
1463         }
1464         return result;
1465 }
1466
1467 EXPORT_SYMBOL(acpi_bus_start);
1468
1469 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1470 {
1471         acpi_status status;
1472         struct acpi_device *parent, *child;
1473         acpi_handle phandle, chandle;
1474         acpi_object_type type;
1475         u32 level = 1;
1476         int err = 0;
1477
1478         parent = start;
1479         phandle = start->handle;
1480         child = chandle = NULL;
1481
1482         while ((level > 0) && parent && (!err)) {
1483                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1484                                               chandle, &chandle);
1485
1486                 /*
1487                  * If this scope is exhausted then move our way back up.
1488                  */
1489                 if (ACPI_FAILURE(status)) {
1490                         level--;
1491                         chandle = phandle;
1492                         acpi_get_parent(phandle, &phandle);
1493                         child = parent;
1494                         parent = parent->parent;
1495
1496                         if (level == 0)
1497                                 err = acpi_bus_remove(child, rmdevice);
1498                         else
1499                                 err = acpi_bus_remove(child, 1);
1500
1501                         continue;
1502                 }
1503
1504                 status = acpi_get_type(chandle, &type);
1505                 if (ACPI_FAILURE(status)) {
1506                         continue;
1507                 }
1508                 /*
1509                  * If there is a device corresponding to chandle then
1510                  * parse it (depth-first).
1511                  */
1512                 if (acpi_bus_get_device(chandle, &child) == 0) {
1513                         level++;
1514                         phandle = chandle;
1515                         chandle = NULL;
1516                         parent = child;
1517                 }
1518                 continue;
1519         }
1520         return err;
1521 }
1522 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1523
1524
1525 static int acpi_bus_scan_fixed(struct acpi_device *root)
1526 {
1527         int result = 0;
1528         struct acpi_device *device = NULL;
1529         struct acpi_bus_ops ops;
1530
1531         if (!root)
1532                 return -ENODEV;
1533
1534         memset(&ops, 0, sizeof(ops));
1535         ops.acpi_op_add = 1;
1536         ops.acpi_op_start = 1;
1537
1538         /*
1539          * Enumerate all fixed-feature devices.
1540          */
1541         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1542                 result = acpi_add_single_object(&device, acpi_root,
1543                                                 NULL,
1544                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1545                                                 &ops);
1546         }
1547
1548         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1549                 result = acpi_add_single_object(&device, acpi_root,
1550                                                 NULL,
1551                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1552                                                 &ops);
1553         }
1554
1555         return result;
1556 }
1557
1558 int __init acpi_boot_ec_enable(void);
1559
1560 static int __init acpi_scan_init(void)
1561 {
1562         int result;
1563         struct acpi_bus_ops ops;
1564
1565
1566         if (acpi_disabled)
1567                 return 0;
1568
1569         memset(&ops, 0, sizeof(ops));
1570         ops.acpi_op_add = 1;
1571         ops.acpi_op_start = 1;
1572
1573         result = bus_register(&acpi_bus_type);
1574         if (result) {
1575                 /* We don't want to quit even if we failed to add suspend/resume */
1576                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1577         }
1578
1579         /*
1580          * Create the root device in the bus's device tree
1581          */
1582         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1583                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1584         if (result)
1585                 goto Done;
1586
1587         /*
1588          * Enumerate devices in the ACPI namespace.
1589          */
1590         result = acpi_bus_scan_fixed(acpi_root);
1591
1592         /* EC region might be needed at bus_scan, so enable it now */
1593         acpi_boot_ec_enable();
1594
1595         if (!result)
1596                 result = acpi_bus_scan(acpi_root, &ops);
1597
1598         if (result)
1599                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1600
1601       Done:
1602         return result;
1603 }
1604
1605 subsys_initcall(acpi_scan_init);