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
  14 #include "internal.h"
  15
  16 #define _COMPONENT              ACPI_BUS_COMPONENT
  17 ACPI_MODULE_NAME("scan");
  18 #define STRUCT_TO_INT(s)        (*((int*)&s))
  19 extern struct acpi_device *acpi_root;
  20
  21 #define ACPI_BUS_CLASS                  "system_bus"
  22 #define ACPI_BUS_HID                    "LNXSYBUS"
  23 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  24
  25 static LIST_HEAD(acpi_device_list);
  26 static LIST_HEAD(acpi_bus_id_list);
  27 DEFINE_MUTEX(acpi_device_lock);
  28 LIST_HEAD(acpi_wakeup_device_list);
  29
  30 struct acpi_device_bus_id{
  31         char bus_id[15];
  32         unsigned int instance_no;
  33         struct list_head node;
  34 };
  35
  36 /*
  37  * Creates hid/cid(s) string needed for modalias and uevent
  38  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  39  * char *modalias: "acpi:IBM0001:ACPI0001"
  40 */
  41 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  42                            int size)
  43 {
  44         int len;
  45         int count;
  46
  47         if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
  48                 return -ENODEV;
  49
  50         len = snprintf(modalias, size, "acpi:");
  51         size -= len;
  52
  53         if (acpi_dev->flags.hardware_id) {
  54                 count = snprintf(&modalias[len], size, "%s:",
  55                                  acpi_dev->pnp.hardware_id);
  56                 if (count < 0 || count >= size)
  57                         return -EINVAL;
  58                 len += count;
  59                 size -= count;
  60         }
  61
  62         if (acpi_dev->flags.compatible_ids) {
  63                 struct acpica_device_id_list *cid_list;
  64                 int i;
  65
  66                 cid_list = acpi_dev->pnp.cid_list;
  67                 for (i = 0; i < cid_list->count; i++) {
  68                         count = snprintf(&modalias[len], size, "%s:",
  69                                          cid_list->ids[i].string);
  70                         if (count < 0 || count >= size) {
  71                                 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
  72                                        acpi_dev->pnp.device_name, i);
  73                                 break;
  74                         }
  75                         len += count;
  76                         size -= count;
  77                 }
  78         }
  79
  80         modalias[len] = '\0';
  81         return len;
  82 }
  83
  84 static ssize_t
  85 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  86         struct acpi_device *acpi_dev = to_acpi_device(dev);
  87         int len;
  88
  89         /* Device has no HID and no CID or string is >1024 */
  90         len = create_modalias(acpi_dev, buf, 1024);
  91         if (len <= 0)
  92                 return 0;
  93         buf[len++] = '\n';
  94         return len;
  95 }
  96 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  97
  98 static void acpi_bus_hot_remove_device(void *context)
  99 {
 100         struct acpi_device *device;
 101         acpi_handle handle = context;
 102         struct acpi_object_list arg_list;
 103         union acpi_object arg;
 104         acpi_status status = AE_OK;
 105
 106         if (acpi_bus_get_device(handle, &device))
 107                 return;
 108
 109         if (!device)
 110                 return;
 111
 112         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 113                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 114
 115         if (acpi_bus_trim(device, 1)) {
 116                 printk(KERN_ERR PREFIX
 117                                 "Removing device failed\n");
 118                 return;
 119         }
 120
 121         /* power off device */
 122         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 123         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 124                 printk(KERN_WARNING PREFIX
 125                                 "Power-off device failed\n");
 126
 127         if (device->flags.lockable) {
 128                 arg_list.count = 1;
 129                 arg_list.pointer = &arg;
 130                 arg.type = ACPI_TYPE_INTEGER;
 131                 arg.integer.value = 0;
 132                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 133         }
 134
 135         arg_list.count = 1;
 136         arg_list.pointer = &arg;
 137         arg.type = ACPI_TYPE_INTEGER;
 138         arg.integer.value = 1;
 139
 140         /*
 141          * TBD: _EJD support.
 142          */
 143         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 144         if (ACPI_FAILURE(status))
 145                 printk(KERN_WARNING PREFIX
 146                                 "Eject device failed\n");
 147
 148         return;
 149 }
 150
 151 static ssize_t
 152 acpi_eject_store(struct device *d, struct device_attribute *attr,
 153                 const char *buf, size_t count)
 154 {
 155         int ret = count;
 156         acpi_status status;
 157         acpi_object_type type = 0;
 158         struct acpi_device *acpi_device = to_acpi_device(d);
 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         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
 176 err:
 177         return ret;
 178 }
 179
 180 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 181
 182 static ssize_t
 183 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 184         struct acpi_device *acpi_dev = to_acpi_device(dev);
 185
 186         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
 187 }
 188 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 189
 190 static ssize_t
 191 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 192         struct acpi_device *acpi_dev = to_acpi_device(dev);
 193         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 194         int result;
 195
 196         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 197         if (result)
 198                 goto end;
 199
 200         result = sprintf(buf, "%s\n", (char*)path.pointer);
 201         kfree(path.pointer);
 202 end:
 203         return result;
 204 }
 205 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 206
 207 static int acpi_device_setup_files(struct acpi_device *dev)
 208 {
 209         acpi_status status;
 210         acpi_handle temp;
 211         int result = 0;
 212
 213         /*
 214          * Devices gotten from FADT don't have a "path" attribute
 215          */
 216         if (dev->handle) {
 217                 result = device_create_file(&dev->dev, &dev_attr_path);
 218                 if (result)
 219                         goto end;
 220         }
 221
 222         if (dev->flags.hardware_id) {
 223                 result = device_create_file(&dev->dev, &dev_attr_hid);
 224                 if (result)
 225                         goto end;
 226         }
 227
 228         if (dev->flags.hardware_id || dev->flags.compatible_ids) {
 229                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 230                 if (result)
 231                         goto end;
 232         }
 233
 234         /*
 235          * If device has _EJ0, 'eject' file is created that is used to trigger
 236          * hot-removal function from userland.
 237          */
 238         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 239         if (ACPI_SUCCESS(status))
 240                 result = device_create_file(&dev->dev, &dev_attr_eject);
 241 end:
 242         return result;
 243 }
 244
 245 static void acpi_device_remove_files(struct acpi_device *dev)
 246 {
 247         acpi_status status;
 248         acpi_handle temp;
 249
 250         /*
 251          * If device has _EJ0, 'eject' file is created that is used to trigger
 252          * hot-removal function from userland.
 253          */
 254         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 255         if (ACPI_SUCCESS(status))
 256                 device_remove_file(&dev->dev, &dev_attr_eject);
 257
 258         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 259                 device_remove_file(&dev->dev, &dev_attr_modalias);
 260
 261         if (dev->flags.hardware_id)
 262                 device_remove_file(&dev->dev, &dev_attr_hid);
 263         if (dev->handle)
 264                 device_remove_file(&dev->dev, &dev_attr_path);
 265 }
 266 /* --------------------------------------------------------------------------
 267                         ACPI Bus operations
 268    -------------------------------------------------------------------------- */
 269
 270 int acpi_match_device_ids(struct acpi_device *device,
 271                           const struct acpi_device_id *ids)
 272 {
 273         const struct acpi_device_id *id;
 274
 275         /*
 276          * If the device is not present, it is unnecessary to load device
 277          * driver for it.
 278          */
 279         if (!device->status.present)
 280                 return -ENODEV;
 281
 282         if (device->flags.hardware_id) {
 283                 for (id = ids; id->id[0]; id++) {
 284                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 285                                 return 0;
 286                 }
 287         }
 288
 289         if (device->flags.compatible_ids) {
 290                 struct acpica_device_id_list *cid_list = device->pnp.cid_list;
 291                 int i;
 292
 293                 for (id = ids; id->id[0]; id++) {
 294                         /* compare multiple _CID entries against driver ids */
 295                         for (i = 0; i < cid_list->count; i++) {
 296                                 if (!strcmp((char*)id->id,
 297                                             cid_list->ids[i].string))
 298                                         return 0;
 299                         }
 300                 }
 301         }
 302
 303         return -ENOENT;
 304 }
 305 EXPORT_SYMBOL(acpi_match_device_ids);
 306
 307 static void acpi_device_release(struct device *dev)
 308 {
 309         struct acpi_device *acpi_dev = to_acpi_device(dev);
 310
 311         kfree(acpi_dev->pnp.cid_list);
 312         if (acpi_dev->flags.hardware_id)
 313                 kfree(acpi_dev->pnp.hardware_id);
 314         if (acpi_dev->flags.unique_id)
 315                 kfree(acpi_dev->pnp.unique_id);
 316         kfree(acpi_dev);
 317 }
 318
 319 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 320 {
 321         struct acpi_device *acpi_dev = to_acpi_device(dev);
 322         struct acpi_driver *acpi_drv = acpi_dev->driver;
 323
 324         if (acpi_drv && acpi_drv->ops.suspend)
 325                 return acpi_drv->ops.suspend(acpi_dev, state);
 326         return 0;
 327 }
 328
 329 static int acpi_device_resume(struct device *dev)
 330 {
 331         struct acpi_device *acpi_dev = to_acpi_device(dev);
 332         struct acpi_driver *acpi_drv = acpi_dev->driver;
 333
 334         if (acpi_drv && acpi_drv->ops.resume)
 335                 return acpi_drv->ops.resume(acpi_dev);
 336         return 0;
 337 }
 338
 339 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 340 {
 341         struct acpi_device *acpi_dev = to_acpi_device(dev);
 342         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 343
 344         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 345 }
 346
 347 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 348 {
 349         struct acpi_device *acpi_dev = to_acpi_device(dev);
 350         int len;
 351
 352         if (add_uevent_var(env, "MODALIAS="))
 353                 return -ENOMEM;
 354         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 355                               sizeof(env->buf) - env->buflen);
 356         if (len >= (sizeof(env->buf) - env->buflen))
 357                 return -ENOMEM;
 358         env->buflen += len;
 359         return 0;
 360 }
 361
 362 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 363 {
 364         struct acpi_device *device = data;
 365
 366         device->driver->ops.notify(device, event);
 367 }
 368
 369 static acpi_status acpi_device_notify_fixed(void *data)
 370 {
 371         struct acpi_device *device = data;
 372
 373         /* Fixed hardware devices have no handles */
 374         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 375         return AE_OK;
 376 }
 377
 378 static int acpi_device_install_notify_handler(struct acpi_device *device)
 379 {
 380         acpi_status status;
 381
 382         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 383                 status =
 384                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 385                                                      acpi_device_notify_fixed,
 386                                                      device);
 387         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 388                 status =
 389                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 390                                                      acpi_device_notify_fixed,
 391                                                      device);
 392         else
 393                 status = acpi_install_notify_handler(device->handle,
 394                                                      ACPI_DEVICE_NOTIFY,
 395                                                      acpi_device_notify,
 396                                                      device);
 397
 398         if (ACPI_FAILURE(status))
 399                 return -EINVAL;
 400         return 0;
 401 }
 402
 403 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 404 {
 405         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 406                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 407                                                 acpi_device_notify_fixed);
 408         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 409                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 410                                                 acpi_device_notify_fixed);
 411         else
 412                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 413                                            acpi_device_notify);
 414 }
 415
 416 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 417 static int acpi_start_single_object(struct acpi_device *);
 418 static int acpi_device_probe(struct device * dev)
 419 {
 420         struct acpi_device *acpi_dev = to_acpi_device(dev);
 421         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 422         int ret;
 423
 424         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 425         if (!ret) {
 426                 if (acpi_dev->bus_ops.acpi_op_start)
 427                         acpi_start_single_object(acpi_dev);
 428
 429                 if (acpi_drv->ops.notify) {
 430                         ret = acpi_device_install_notify_handler(acpi_dev);
 431                         if (ret) {
 432                                 if (acpi_drv->ops.remove)
 433                                         acpi_drv->ops.remove(acpi_dev,
 434                                                      acpi_dev->removal_type);
 435                                 return ret;
 436                         }
 437                 }
 438
 439                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 440                         "Found driver [%s] for device [%s]\n",
 441                         acpi_drv->name, acpi_dev->pnp.bus_id));
 442                 get_device(dev);
 443         }
 444         return ret;
 445 }
 446
 447 static int acpi_device_remove(struct device * dev)
 448 {
 449         struct acpi_device *acpi_dev = to_acpi_device(dev);
 450         struct acpi_driver *acpi_drv = acpi_dev->driver;
 451
 452         if (acpi_drv) {
 453                 if (acpi_drv->ops.notify)
 454                         acpi_device_remove_notify_handler(acpi_dev);
 455                 if (acpi_drv->ops.remove)
 456                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 457         }
 458         acpi_dev->driver = NULL;
 459         acpi_dev->driver_data = NULL;
 460
 461         put_device(dev);
 462         return 0;
 463 }
 464
 465 struct bus_type acpi_bus_type = {
 466         .name           = "acpi",
 467         .suspend        = acpi_device_suspend,
 468         .resume         = acpi_device_resume,
 469         .match          = acpi_bus_match,
 470         .probe          = acpi_device_probe,
 471         .remove         = acpi_device_remove,
 472         .uevent         = acpi_device_uevent,
 473 };
 474
 475 static int acpi_device_register(struct acpi_device *device)
 476 {
 477         int result;
 478         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 479         int found = 0;
 480
 481         /*
 482          * Linkage
 483          * -------
 484          * Link this device to its parent and siblings.
 485          */
 486         INIT_LIST_HEAD(&device->children);
 487         INIT_LIST_HEAD(&device->node);
 488         INIT_LIST_HEAD(&device->wakeup_list);
 489
 490         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 491         if (!new_bus_id) {
 492                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 493                 return -ENOMEM;
 494         }
 495
 496         mutex_lock(&acpi_device_lock);
 497         /*
 498          * Find suitable bus_id and instance number in acpi_bus_id_list
 499          * If failed, create one and link it into acpi_bus_id_list
 500          */
 501         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 502                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 503                         acpi_device_bus_id->instance_no ++;
 504                         found = 1;
 505                         kfree(new_bus_id);
 506                         break;
 507                 }
 508         }
 509         if (!found) {
 510                 acpi_device_bus_id = new_bus_id;
 511                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 512                 acpi_device_bus_id->instance_no = 0;
 513                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 514         }
 515         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 516
 517         if (device->parent)
 518                 list_add_tail(&device->node, &device->parent->children);
 519
 520         if (device->wakeup.flags.valid)
 521                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 522         mutex_unlock(&acpi_device_lock);
 523
 524         if (device->parent)
 525                 device->dev.parent = &device->parent->dev;
 526         device->dev.bus = &acpi_bus_type;
 527         device->dev.release = &acpi_device_release;
 528         result = device_register(&device->dev);
 529         if (result) {
 530                 dev_err(&device->dev, "Error registering device\n");
 531                 goto end;
 532         }
 533
 534         result = acpi_device_setup_files(device);
 535         if (result)
 536                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 537                        dev_name(&device->dev));
 538
 539         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 540         return 0;
 541 end:
 542         mutex_lock(&acpi_device_lock);
 543         if (device->parent)
 544                 list_del(&device->node);
 545         list_del(&device->wakeup_list);
 546         mutex_unlock(&acpi_device_lock);
 547         return result;
 548 }
 549
 550 static void acpi_device_unregister(struct acpi_device *device, int type)
 551 {
 552         mutex_lock(&acpi_device_lock);
 553         if (device->parent)
 554                 list_del(&device->node);
 555
 556         list_del(&device->wakeup_list);
 557         mutex_unlock(&acpi_device_lock);
 558
 559         acpi_detach_data(device->handle, acpi_bus_data_handler);
 560
 561         acpi_device_remove_files(device);
 562         device_unregister(&device->dev);
 563 }
 564
 565 /* --------------------------------------------------------------------------
 566                                  Driver Management
 567    -------------------------------------------------------------------------- */
 568 /**
 569  * acpi_bus_driver_init - add a device to a driver
 570  * @device: the device to add and initialize
 571  * @driver: driver for the device
 572  *
 573  * Used to initialize a device via its device driver.  Called whenever a
 574  * driver is bound to a device.  Invokes the driver's add() ops.
 575  */
 576 static int
 577 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 578 {
 579         int result = 0;
 580
 581         if (!device || !driver)
 582                 return -EINVAL;
 583
 584         if (!driver->ops.add)
 585                 return -ENOSYS;
 586
 587         result = driver->ops.add(device);
 588         if (result) {
 589                 device->driver = NULL;
 590                 device->driver_data = NULL;
 591                 return result;
 592         }
 593
 594         device->driver = driver;
 595
 596         /*
 597          * TBD - Configuration Management: Assign resources to device based
 598          * upon possible configuration and currently allocated resources.
 599          */
 600
 601         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 602                           "Driver successfully bound to device\n"));
 603         return 0;
 604 }
 605
 606 static int acpi_start_single_object(struct acpi_device *device)
 607 {
 608         int result = 0;
 609         struct acpi_driver *driver;
 610
 611
 612         if (!(driver = device->driver))
 613                 return 0;
 614
 615         if (driver->ops.start) {
 616                 result = driver->ops.start(device);
 617                 if (result && driver->ops.remove)
 618                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 619         }
 620
 621         return result;
 622 }
 623
 624 /**
 625  * acpi_bus_register_driver - register a driver with the ACPI bus
 626  * @driver: driver being registered
 627  *
 628  * Registers a driver with the ACPI bus.  Searches the namespace for all
 629  * devices that match the driver's criteria and binds.  Returns zero for
 630  * success or a negative error status for failure.
 631  */
 632 int acpi_bus_register_driver(struct acpi_driver *driver)
 633 {
 634         int ret;
 635
 636         if (acpi_disabled)
 637                 return -ENODEV;
 638         driver->drv.name = driver->name;
 639         driver->drv.bus = &acpi_bus_type;
 640         driver->drv.owner = driver->owner;
 641
 642         ret = driver_register(&driver->drv);
 643         return ret;
 644 }
 645
 646 EXPORT_SYMBOL(acpi_bus_register_driver);
 647
 648 /**
 649  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 650  * @driver: driver to unregister
 651  *
 652  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 653  * devices that match the driver's criteria and unbinds.
 654  */
 655 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 656 {
 657         driver_unregister(&driver->drv);
 658 }
 659
 660 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 661
 662 /* --------------------------------------------------------------------------
 663                                  Device Enumeration
 664    -------------------------------------------------------------------------- */
 665 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 666 {
 667         acpi_status status;
 668         int ret;
 669         struct acpi_device *device;
 670
 671         /*
 672          * Fixed hardware devices do not appear in the namespace and do not
 673          * have handles, but we fabricate acpi_devices for them, so we have
 674          * to deal with them specially.
 675          */
 676         if (handle == NULL)
 677                 return acpi_root;
 678
 679         do {
 680                 status = acpi_get_parent(handle, &handle);
 681                 if (status == AE_NULL_ENTRY)
 682                         return NULL;
 683                 if (ACPI_FAILURE(status))
 684                         return acpi_root;
 685
 686                 ret = acpi_bus_get_device(handle, &device);
 687                 if (ret == 0)
 688                         return device;
 689         } while (1);
 690 }
 691
 692 acpi_status
 693 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 694 {
 695         acpi_status status;
 696         acpi_handle tmp;
 697         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 698         union acpi_object *obj;
 699
 700         status = acpi_get_handle(handle, "_EJD", &tmp);
 701         if (ACPI_FAILURE(status))
 702                 return status;
 703
 704         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 705         if (ACPI_SUCCESS(status)) {
 706                 obj = buffer.pointer;
 707                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 708                                          ejd);
 709                 kfree(buffer.pointer);
 710         }
 711         return status;
 712 }
 713 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 714
 715 void acpi_bus_data_handler(acpi_handle handle, void *context)
 716 {
 717
 718         /* TBD */
 719
 720         return;
 721 }
 722
 723 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 724 {
 725         device->performance.state = ACPI_STATE_UNKNOWN;
 726         return 0;
 727 }
 728
 729 static acpi_status
 730 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 731                                              union acpi_object *package)
 732 {
 733         int i = 0;
 734         union acpi_object *element = NULL;
 735
 736         if (!device || !package || (package->package.count < 2))
 737                 return AE_BAD_PARAMETER;
 738
 739         element = &(package->package.elements[0]);
 740         if (!element)
 741                 return AE_BAD_PARAMETER;
 742         if (element->type == ACPI_TYPE_PACKAGE) {
 743                 if ((element->package.count < 2) ||
 744                     (element->package.elements[0].type !=
 745                      ACPI_TYPE_LOCAL_REFERENCE)
 746                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 747                         return AE_BAD_DATA;
 748                 device->wakeup.gpe_device =
 749                     element->package.elements[0].reference.handle;
 750                 device->wakeup.gpe_number =
 751                     (u32) element->package.elements[1].integer.value;
 752         } else if (element->type == ACPI_TYPE_INTEGER) {
 753                 device->wakeup.gpe_number = element->integer.value;
 754         } else
 755                 return AE_BAD_DATA;
 756
 757         element = &(package->package.elements[1]);
 758         if (element->type != ACPI_TYPE_INTEGER) {
 759                 return AE_BAD_DATA;
 760         }
 761         device->wakeup.sleep_state = element->integer.value;
 762
 763         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 764                 return AE_NO_MEMORY;
 765         }
 766         device->wakeup.resources.count = package->package.count - 2;
 767         for (i = 0; i < device->wakeup.resources.count; i++) {
 768                 element = &(package->package.elements[i + 2]);
 769                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 770                         return AE_BAD_DATA;
 771
 772                 device->wakeup.resources.handles[i] = element->reference.handle;
 773         }
 774
 775         return AE_OK;
 776 }
 777
 778 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 779 {
 780         acpi_status status = 0;
 781         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 782         union acpi_object *package = NULL;
 783         int psw_error;
 784
 785         struct acpi_device_id button_device_ids[] = {
 786                 {"PNP0C0D", 0},
 787                 {"PNP0C0C", 0},
 788                 {"PNP0C0E", 0},
 789                 {"", 0},
 790         };
 791
 792         /* _PRW */
 793         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 794         if (ACPI_FAILURE(status)) {
 795                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 796                 goto end;
 797         }
 798
 799         package = (union acpi_object *)buffer.pointer;
 800         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 801         if (ACPI_FAILURE(status)) {
 802                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 803                 goto end;
 804         }
 805
 806         kfree(buffer.pointer);
 807
 808         device->wakeup.flags.valid = 1;
 809         device->wakeup.prepare_count = 0;
 810         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 811          * system for the ACPI device with the _PRW object.
 812          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 813          * So it is necessary to call _DSW object first. Only when it is not
 814          * present will the _PSW object used.
 815          */
 816         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 817         if (psw_error)
 818                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 819                                 "error in _DSW or _PSW evaluation\n"));
 820
 821         /* Power button, Lid switch always enable wakeup */
 822         if (!acpi_match_device_ids(device, button_device_ids))
 823                 device->wakeup.flags.run_wake = 1;
 824
 825 end:
 826         if (ACPI_FAILURE(status))
 827                 device->flags.wake_capable = 0;
 828         return 0;
 829 }
 830
 831 static int acpi_bus_get_power_flags(struct acpi_device *device)
 832 {
 833         acpi_status status = 0;
 834         acpi_handle handle = NULL;
 835         u32 i = 0;
 836
 837
 838         /*
 839          * Power Management Flags
 840          */
 841         status = acpi_get_handle(device->handle, "_PSC", &handle);
 842         if (ACPI_SUCCESS(status))
 843                 device->power.flags.explicit_get = 1;
 844         status = acpi_get_handle(device->handle, "_IRC", &handle);
 845         if (ACPI_SUCCESS(status))
 846                 device->power.flags.inrush_current = 1;
 847
 848         /*
 849          * Enumerate supported power management states
 850          */
 851         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 852                 struct acpi_device_power_state *ps = &device->power.states[i];
 853                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 854
 855                 /* Evaluate "_PRx" to se if power resources are referenced */
 856                 acpi_evaluate_reference(device->handle, object_name, NULL,
 857                                         &ps->resources);
 858                 if (ps->resources.count) {
 859                         device->power.flags.power_resources = 1;
 860                         ps->flags.valid = 1;
 861                 }
 862
 863                 /* Evaluate "_PSx" to see if we can do explicit sets */
 864                 object_name[2] = 'S';
 865                 status = acpi_get_handle(device->handle, object_name, &handle);
 866                 if (ACPI_SUCCESS(status)) {
 867                         ps->flags.explicit_set = 1;
 868                         ps->flags.valid = 1;
 869                 }
 870
 871                 /* State is valid if we have some power control */
 872                 if (ps->resources.count || ps->flags.explicit_set)
 873                         ps->flags.valid = 1;
 874
 875                 ps->power = -1; /* Unknown - driver assigned */
 876                 ps->latency = -1;       /* Unknown - driver assigned */
 877         }
 878
 879         /* Set defaults for D0 and D3 states (always valid) */
 880         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 881         device->power.states[ACPI_STATE_D0].power = 100;
 882         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 883         device->power.states[ACPI_STATE_D3].power = 0;
 884
 885         /* TBD: System wake support and resource requirements. */
 886
 887         device->power.state = ACPI_STATE_UNKNOWN;
 888         acpi_bus_get_power(device->handle, &(device->power.state));
 889
 890         return 0;
 891 }
 892
 893 static int acpi_bus_get_flags(struct acpi_device *device)
 894 {
 895         acpi_status status = AE_OK;
 896         acpi_handle temp = NULL;
 897
 898
 899         /* Presence of _STA indicates 'dynamic_status' */
 900         status = acpi_get_handle(device->handle, "_STA", &temp);
 901         if (ACPI_SUCCESS(status))
 902                 device->flags.dynamic_status = 1;
 903
 904         /* Presence of _CID indicates 'compatible_ids' */
 905         status = acpi_get_handle(device->handle, "_CID", &temp);
 906         if (ACPI_SUCCESS(status))
 907                 device->flags.compatible_ids = 1;
 908
 909         /* Presence of _RMV indicates 'removable' */
 910         status = acpi_get_handle(device->handle, "_RMV", &temp);
 911         if (ACPI_SUCCESS(status))
 912                 device->flags.removable = 1;
 913
 914         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 915         status = acpi_get_handle(device->handle, "_EJD", &temp);
 916         if (ACPI_SUCCESS(status))
 917                 device->flags.ejectable = 1;
 918         else {
 919                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 920                 if (ACPI_SUCCESS(status))
 921                         device->flags.ejectable = 1;
 922         }
 923
 924         /* Presence of _LCK indicates 'lockable' */
 925         status = acpi_get_handle(device->handle, "_LCK", &temp);
 926         if (ACPI_SUCCESS(status))
 927                 device->flags.lockable = 1;
 928
 929         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 930         status = acpi_get_handle(device->handle, "_PS0", &temp);
 931         if (ACPI_FAILURE(status))
 932                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 933         if (ACPI_SUCCESS(status))
 934                 device->flags.power_manageable = 1;
 935
 936         /* Presence of _PRW indicates wake capable */
 937         status = acpi_get_handle(device->handle, "_PRW", &temp);
 938         if (ACPI_SUCCESS(status))
 939                 device->flags.wake_capable = 1;
 940
 941         /* TBD: Performance management */
 942
 943         return 0;
 944 }
 945
 946 static void acpi_device_get_busid(struct acpi_device *device)
 947 {
 948         char bus_id[5] = { '?', 0 };
 949         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 950         int i = 0;
 951
 952         /*
 953          * Bus ID
 954          * ------
 955          * The device's Bus ID is simply the object name.
 956          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 957          */
 958         switch (device->device_type) {
 959         case ACPI_BUS_TYPE_SYSTEM:
 960                 strcpy(device->pnp.bus_id, "ACPI");
 961                 break;
 962         case ACPI_BUS_TYPE_POWER_BUTTON:
 963                 strcpy(device->pnp.bus_id, "PWRF");
 964                 break;
 965         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 966                 strcpy(device->pnp.bus_id, "SLPF");
 967                 break;
 968         default:
 969                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
 970                 /* Clean up trailing underscores (if any) */
 971                 for (i = 3; i > 1; i--) {
 972                         if (bus_id[i] == '_')
 973                                 bus_id[i] = '\0';
 974                         else
 975                                 break;
 976                 }
 977                 strcpy(device->pnp.bus_id, bus_id);
 978                 break;
 979         }
 980 }
 981
 982 /*
 983  * acpi_bay_match - see if a device is an ejectable driver bay
 984  *
 985  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 986  * then we can safely call it an ejectable drive bay
 987  */
 988 static int acpi_bay_match(struct acpi_device *device){
 989         acpi_status status;
 990         acpi_handle handle;
 991         acpi_handle tmp;
 992         acpi_handle phandle;
 993
 994         handle = device->handle;
 995
 996         status = acpi_get_handle(handle, "_EJ0", &tmp);
 997         if (ACPI_FAILURE(status))
 998                 return -ENODEV;
 999
1000         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1001                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1002                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1003                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1004                 return 0;
1005
1006         if (acpi_get_parent(handle, &phandle))
1007                 return -ENODEV;
1008
1009         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1010                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1011                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1012                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1013                 return 0;
1014
1015         return -ENODEV;
1016 }
1017
1018 /*
1019  * acpi_dock_match - see if a device has a _DCK method
1020  */
1021 static int acpi_dock_match(struct acpi_device *device)
1022 {
1023         acpi_handle tmp;
1024         return acpi_get_handle(device->handle, "_DCK", &tmp);
1025 }
1026
1027 static struct acpica_device_id_list*
1028 acpi_add_cid(
1029         struct acpi_device_info         *info,
1030         struct acpica_device_id         *new_cid)
1031 {
1032         struct acpica_device_id_list    *cid;
1033         char                            *next_id_string;
1034         acpi_size                       cid_length;
1035         acpi_size                       new_cid_length;
1036         u32                             i;
1037
1038
1039         /* Allocate new CID list with room for the new CID */
1040
1041         if (!new_cid)
1042                 new_cid_length = info->compatible_id_list.list_size;
1043         else if (info->compatible_id_list.list_size)
1044                 new_cid_length = info->compatible_id_list.list_size +
1045                         new_cid->length + sizeof(struct acpica_device_id);
1046         else
1047                 new_cid_length = sizeof(struct acpica_device_id_list) + new_cid->length;
1048
1049         cid = ACPI_ALLOCATE_ZEROED(new_cid_length);
1050         if (!cid) {
1051                 return NULL;
1052         }
1053
1054         cid->list_size = new_cid_length;
1055         cid->count = info->compatible_id_list.count;
1056         if (new_cid)
1057                 cid->count++;
1058         next_id_string = (char *) cid->ids + (cid->count * sizeof(struct acpica_device_id));
1059
1060         /* Copy all existing CIDs */
1061
1062         for (i = 0; i < info->compatible_id_list.count; i++) {
1063                 cid_length = info->compatible_id_list.ids[i].length;
1064                 cid->ids[i].string = next_id_string;
1065                 cid->ids[i].length = cid_length;
1066
1067                 ACPI_MEMCPY(next_id_string, info->compatible_id_list.ids[i].string,
1068                         cid_length);
1069
1070                 next_id_string += cid_length;
1071         }
1072
1073         /* Append the new CID */
1074
1075         if (new_cid) {
1076                 cid->ids[i].string = next_id_string;
1077                 cid->ids[i].length = new_cid->length;
1078
1079                 ACPI_MEMCPY(next_id_string, new_cid->string, new_cid->length);
1080         }
1081
1082         return cid;
1083 }
1084
1085 static void acpi_device_set_id(struct acpi_device *device)
1086 {
1087         struct acpi_device_info *info = NULL;
1088         char *hid = NULL;
1089         char *uid = NULL;
1090         struct acpica_device_id_list *cid_list = NULL;
1091         char *cid_add = NULL;
1092         acpi_status status;
1093
1094         switch (device->device_type) {
1095         case ACPI_BUS_TYPE_DEVICE:
1096                 status = acpi_get_object_info(device->handle, &info);
1097                 if (ACPI_FAILURE(status)) {
1098                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1099                         return;
1100                 }
1101
1102                 if (info->valid & ACPI_VALID_HID)
1103                         hid = info->hardware_id.string;
1104                 if (info->valid & ACPI_VALID_UID)
1105                         uid = info->unique_id.string;
1106                 if (info->valid & ACPI_VALID_CID)
1107                         cid_list = &info->compatible_id_list;
1108                 if (info->valid & ACPI_VALID_ADR) {
1109                         device->pnp.bus_address = info->address;
1110                         device->flags.bus_address = 1;
1111                 }
1112
1113                 /* If we have a video/bay/dock device, add our selfdefined
1114                    HID to the CID list. Like that the video/bay/dock drivers
1115                    will get autoloaded and the device might still match
1116                    against another driver.
1117                 */
1118                 if (acpi_is_video_device(device))
1119                         cid_add = ACPI_VIDEO_HID;
1120                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1121                         cid_add = ACPI_BAY_HID;
1122                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1123                         cid_add = ACPI_DOCK_HID;
1124
1125                 break;
1126         case ACPI_BUS_TYPE_POWER:
1127                 hid = ACPI_POWER_HID;
1128                 break;
1129         case ACPI_BUS_TYPE_PROCESSOR:
1130                 hid = ACPI_PROCESSOR_OBJECT_HID;
1131                 break;
1132         case ACPI_BUS_TYPE_SYSTEM:
1133                 hid = ACPI_SYSTEM_HID;
1134                 break;
1135         case ACPI_BUS_TYPE_THERMAL:
1136                 hid = ACPI_THERMAL_HID;
1137                 break;
1138         case ACPI_BUS_TYPE_POWER_BUTTON:
1139                 hid = ACPI_BUTTON_HID_POWERF;
1140                 break;
1141         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1142                 hid = ACPI_BUTTON_HID_SLEEPF;
1143                 break;
1144         }
1145
1146         /*
1147          * \_SB
1148          * ----
1149          * Fix for the system root bus device -- the only root-level device.
1150          */
1151         if (((acpi_handle)device->parent == ACPI_ROOT_OBJECT) &&
1152              (device->device_type == ACPI_BUS_TYPE_DEVICE)) {
1153                 hid = ACPI_BUS_HID;
1154                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1155                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1156         }
1157
1158         if (hid) {
1159                 device->pnp.hardware_id = ACPI_ALLOCATE_ZEROED(strlen (hid) + 1);
1160                 if (device->pnp.hardware_id) {
1161                         strcpy(device->pnp.hardware_id, hid);
1162                         device->flags.hardware_id = 1;
1163                 }
1164         }
1165         if (!device->flags.hardware_id)
1166                 device->pnp.hardware_id = "";
1167
1168         if (uid) {
1169                 device->pnp.unique_id = ACPI_ALLOCATE_ZEROED(strlen (uid) + 1);
1170                 if (device->pnp.unique_id) {
1171                         strcpy(device->pnp.unique_id, uid);
1172                         device->flags.unique_id = 1;
1173                 }
1174         }
1175         if (!device->flags.unique_id)
1176                 device->pnp.unique_id = "";
1177
1178         if (cid_list || cid_add) {
1179                 struct acpica_device_id_list *list;
1180
1181                 if (cid_add) {
1182                         struct acpica_device_id cid;
1183                         cid.length = strlen (cid_add) + 1;
1184                         cid.string = cid_add;
1185
1186                         list = acpi_add_cid(info, &cid);
1187                 } else {
1188                         list = acpi_add_cid(info, NULL);
1189                 }
1190
1191                 if (list) {
1192                         device->pnp.cid_list = list;
1193                         if (cid_add)
1194                                 device->flags.compatible_ids = 1;
1195                 }
1196         }
1197
1198         kfree(info);
1199 }
1200
1201 static int acpi_device_set_context(struct acpi_device *device)
1202 {
1203         acpi_status status;
1204
1205         /*
1206          * Context
1207          * -------
1208          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1209          * resolutions from handle->device very efficient.  Fixed hardware
1210          * devices have no handles, so we skip them.
1211          */
1212         if (!device->handle)
1213                 return 0;
1214
1215         status = acpi_attach_data(device->handle,
1216                                   acpi_bus_data_handler, device);
1217         if (ACPI_SUCCESS(status))
1218                 return 0;
1219
1220         printk(KERN_ERR PREFIX "Error attaching device data\n");
1221         return -ENODEV;
1222 }
1223
1224 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1225 {
1226         if (!dev)
1227                 return -EINVAL;
1228
1229         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1230         device_release_driver(&dev->dev);
1231
1232         if (!rmdevice)
1233                 return 0;
1234
1235         /*
1236          * unbind _ADR-Based Devices when hot removal
1237          */
1238         if (dev->flags.bus_address) {
1239                 if ((dev->parent) && (dev->parent->ops.unbind))
1240                         dev->parent->ops.unbind(dev);
1241         }
1242         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1243
1244         return 0;
1245 }
1246
1247 static int acpi_add_single_object(struct acpi_device **child,
1248                                   acpi_handle handle, int type,
1249                                   struct acpi_bus_ops *ops)
1250 {
1251         int result;
1252         struct acpi_device *device;
1253         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1254
1255         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1256         if (!device) {
1257                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1258                 return -ENOMEM;
1259         }
1260
1261         device->device_type = type;
1262         device->handle = handle;
1263         device->parent = acpi_bus_get_parent(handle);
1264         device->bus_ops = *ops; /* workround for not call .start */
1265
1266         acpi_device_get_busid(device);
1267
1268         /*
1269          * Flags
1270          * -----
1271          * Get prior to calling acpi_bus_get_status() so we know whether
1272          * or not _STA is present.  Note that we only look for object
1273          * handles -- cannot evaluate objects until we know the device is
1274          * present and properly initialized.
1275          */
1276         result = acpi_bus_get_flags(device);
1277         if (result)
1278                 goto end;
1279
1280         /*
1281          * Status
1282          * ------
1283          * See if the device is present.  We always assume that non-Device
1284          * and non-Processor objects (e.g. thermal zones, power resources,
1285          * etc.) are present, functioning, etc. (at least when parent object
1286          * is present).  Note that _STA has a different meaning for some
1287          * objects (e.g. power resources) so we need to be careful how we use
1288          * it.
1289          */
1290         switch (type) {
1291         case ACPI_BUS_TYPE_PROCESSOR:
1292         case ACPI_BUS_TYPE_DEVICE:
1293                 result = acpi_bus_get_status(device);
1294                 if (ACPI_FAILURE(result)) {
1295                         result = -ENODEV;
1296                         goto end;
1297                 }
1298                 /*
1299                  * When the device is neither present nor functional, the
1300                  * device should not be added to Linux ACPI device tree.
1301                  * When the status of the device is not present but functinal,
1302                  * it should be added to Linux ACPI tree. For example : bay
1303                  * device , dock device.
1304                  * In such conditions it is unncessary to check whether it is
1305                  * bay device or dock device.
1306                  */
1307                 if (!device->status.present && !device->status.functional) {
1308                         result = -ENODEV;
1309                         goto end;
1310                 }
1311                 break;
1312         default:
1313                 STRUCT_TO_INT(device->status) =
1314                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1315                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1316                 break;
1317         }
1318
1319         /*
1320          * Initialize Device
1321          * -----------------
1322          * TBD: Synch with Core's enumeration/initialization process.
1323          */
1324
1325         /*
1326          * Hardware ID, Unique ID, & Bus Address
1327          * -------------------------------------
1328          */
1329         acpi_device_set_id(device);
1330
1331         /*
1332          * Power Management
1333          * ----------------
1334          */
1335         if (device->flags.power_manageable) {
1336                 result = acpi_bus_get_power_flags(device);
1337                 if (result)
1338                         goto end;
1339         }
1340
1341         /*
1342          * Wakeup device management
1343          *-----------------------
1344          */
1345         if (device->flags.wake_capable) {
1346                 result = acpi_bus_get_wakeup_device_flags(device);
1347                 if (result)
1348                         goto end;
1349         }
1350
1351         /*
1352          * Performance Management
1353          * ----------------------
1354          */
1355         if (device->flags.performance_manageable) {
1356                 result = acpi_bus_get_perf_flags(device);
1357                 if (result)
1358                         goto end;
1359         }
1360
1361         if ((result = acpi_device_set_context(device)))
1362                 goto end;
1363
1364         result = acpi_device_register(device);
1365
1366         /*
1367          * Bind _ADR-Based Devices when hot add
1368          */
1369         if (device->flags.bus_address) {
1370                 if (device->parent && device->parent->ops.bind)
1371                         device->parent->ops.bind(device);
1372         }
1373
1374 end:
1375         if (!result) {
1376                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1377                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1378                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1379                          (char *) buffer.pointer,
1380                          device->parent ? dev_name(&device->parent->dev) :
1381                                           "(null)"));
1382                 kfree(buffer.pointer);
1383                 *child = device;
1384         } else
1385                 acpi_device_release(&device->dev);
1386
1387         return result;
1388 }
1389
1390 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops)
1391 {
1392         acpi_status status = AE_OK;
1393         struct acpi_device *parent = NULL;
1394         struct acpi_device *child = NULL;
1395         acpi_handle phandle = NULL;
1396         acpi_handle chandle = NULL;
1397         acpi_object_type type = 0;
1398         u32 level = 1;
1399         int ret;
1400
1401         /*
1402          * We must have an acpi_device for the starting node already, and
1403          * we scan its children.
1404          */
1405         phandle = handle;
1406         ret = acpi_bus_get_device(phandle, &parent);
1407         if (ret)
1408                 return ret;
1409
1410         /*
1411          * Parse through the ACPI namespace, identify all 'devices', and
1412          * create a new 'struct acpi_device' for each.
1413          */
1414         while ((level > 0) && parent) {
1415
1416                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1417                                               chandle, &chandle);
1418
1419                 /*
1420                  * If this scope is exhausted then move our way back up.
1421                  */
1422                 if (ACPI_FAILURE(status)) {
1423                         level--;
1424                         chandle = phandle;
1425                         acpi_get_parent(phandle, &phandle);
1426                         if (parent->parent)
1427                                 parent = parent->parent;
1428                         continue;
1429                 }
1430
1431                 status = acpi_get_type(chandle, &type);
1432                 if (ACPI_FAILURE(status))
1433                         continue;
1434
1435                 /*
1436                  * If this is a scope object then parse it (depth-first).
1437                  */
1438                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1439                         level++;
1440                         phandle = chandle;
1441                         chandle = NULL;
1442                         continue;
1443                 }
1444
1445                 /*
1446                  * We're only interested in objects that we consider 'devices'.
1447                  */
1448                 switch (type) {
1449                 case ACPI_TYPE_DEVICE:
1450                         type = ACPI_BUS_TYPE_DEVICE;
1451                         break;
1452                 case ACPI_TYPE_PROCESSOR:
1453                         type = ACPI_BUS_TYPE_PROCESSOR;
1454                         break;
1455                 case ACPI_TYPE_THERMAL:
1456                         type = ACPI_BUS_TYPE_THERMAL;
1457                         break;
1458                 case ACPI_TYPE_POWER:
1459                         type = ACPI_BUS_TYPE_POWER;
1460                         break;
1461                 default:
1462                         continue;
1463                 }
1464
1465                 if (ops->acpi_op_add)
1466                         status = acpi_add_single_object(&child, chandle, type,
1467                                                         ops);
1468                 else
1469                         status = acpi_bus_get_device(chandle, &child);
1470
1471                 if (ACPI_FAILURE(status))
1472                         continue;
1473
1474                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1475                         status = acpi_start_single_object(child);
1476                         if (ACPI_FAILURE(status))
1477                                 continue;
1478                 }
1479
1480                 /*
1481                  * If the device is present, enabled, and functioning then
1482                  * parse its scope (depth-first).  Note that we need to
1483                  * represent absent devices to facilitate PnP notifications
1484                  * -- but only the subtree head (not all of its children,
1485                  * which will be enumerated when the parent is inserted).
1486                  *
1487                  * TBD: Need notifications and other detection mechanisms
1488                  *      in place before we can fully implement this.
1489                  */
1490                  /*
1491                  * When the device is not present but functional, it is also
1492                  * necessary to scan the children of this device.
1493                  */
1494                 if (child->status.present || (!child->status.present &&
1495                                         child->status.functional)) {
1496                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1497                                                       NULL, NULL);
1498                         if (ACPI_SUCCESS(status)) {
1499                                 level++;
1500                                 phandle = chandle;
1501                                 chandle = NULL;
1502                                 parent = child;
1503                         }
1504                 }
1505         }
1506
1507         return 0;
1508 }
1509
1510 int
1511 acpi_bus_add(struct acpi_device **child,
1512              struct acpi_device *parent, acpi_handle handle, int type)
1513 {
1514         int result;
1515         struct acpi_bus_ops ops;
1516
1517         memset(&ops, 0, sizeof(ops));
1518         ops.acpi_op_add = 1;
1519
1520         result = acpi_add_single_object(child, handle, type, &ops);
1521         if (!result)
1522                 result = acpi_bus_scan((*child)->handle, &ops);
1523
1524         return result;
1525 }
1526 EXPORT_SYMBOL(acpi_bus_add);
1527
1528 int acpi_bus_start(struct acpi_device *device)
1529 {
1530         int result;
1531         struct acpi_bus_ops ops;
1532
1533         memset(&ops, 0, sizeof(ops));
1534         ops.acpi_op_start = 1;
1535
1536         result = acpi_start_single_object(device);
1537         if (!result)
1538                 result = acpi_bus_scan(device->handle, &ops);
1539
1540         return result;
1541 }
1542 EXPORT_SYMBOL(acpi_bus_start);
1543
1544 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1545 {
1546         acpi_status status;
1547         struct acpi_device *parent, *child;
1548         acpi_handle phandle, chandle;
1549         acpi_object_type type;
1550         u32 level = 1;
1551         int err = 0;
1552
1553         parent = start;
1554         phandle = start->handle;
1555         child = chandle = NULL;
1556
1557         while ((level > 0) && parent && (!err)) {
1558                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1559                                               chandle, &chandle);
1560
1561                 /*
1562                  * If this scope is exhausted then move our way back up.
1563                  */
1564                 if (ACPI_FAILURE(status)) {
1565                         level--;
1566                         chandle = phandle;
1567                         acpi_get_parent(phandle, &phandle);
1568                         child = parent;
1569                         parent = parent->parent;
1570
1571                         if (level == 0)
1572                                 err = acpi_bus_remove(child, rmdevice);
1573                         else
1574                                 err = acpi_bus_remove(child, 1);
1575
1576                         continue;
1577                 }
1578
1579                 status = acpi_get_type(chandle, &type);
1580                 if (ACPI_FAILURE(status)) {
1581                         continue;
1582                 }
1583                 /*
1584                  * If there is a device corresponding to chandle then
1585                  * parse it (depth-first).
1586                  */
1587                 if (acpi_bus_get_device(chandle, &child) == 0) {
1588                         level++;
1589                         phandle = chandle;
1590                         chandle = NULL;
1591                         parent = child;
1592                 }
1593                 continue;
1594         }
1595         return err;
1596 }
1597 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1598
1599 static int acpi_bus_scan_fixed(void)
1600 {
1601         int result = 0;
1602         struct acpi_device *device = NULL;
1603         struct acpi_bus_ops ops;
1604
1605         memset(&ops, 0, sizeof(ops));
1606         ops.acpi_op_add = 1;
1607         ops.acpi_op_start = 1;
1608
1609         /*
1610          * Enumerate all fixed-feature devices.
1611          */
1612         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1613                 result = acpi_add_single_object(&device, NULL,
1614                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1615                                                 &ops);
1616         }
1617
1618         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1619                 result = acpi_add_single_object(&device, NULL,
1620                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1621                                                 &ops);
1622         }
1623
1624         return result;
1625 }
1626
1627 int __init acpi_scan_init(void)
1628 {
1629         int result;
1630         struct acpi_bus_ops ops;
1631
1632         memset(&ops, 0, sizeof(ops));
1633         ops.acpi_op_add = 1;
1634         ops.acpi_op_start = 1;
1635
1636         result = bus_register(&acpi_bus_type);
1637         if (result) {
1638                 /* We don't want to quit even if we failed to add suspend/resume */
1639                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1640         }
1641
1642         /*
1643          * Create the root device in the bus's device tree
1644          */
1645         result = acpi_add_single_object(&acpi_root, ACPI_ROOT_OBJECT,
1646                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1647         if (result)
1648                 goto Done;
1649
1650         /*
1651          * Enumerate devices in the ACPI namespace.
1652          */
1653         result = acpi_bus_scan(acpi_root->handle, &ops);
1654
1655         if (!result)
1656                 result = acpi_bus_scan_fixed();
1657
1658         if (result)
1659                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1660
1661 Done:
1662         return result;
1663 }