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 acpi_status
 666 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 667 {
 668         acpi_status status;
 669         acpi_handle tmp;
 670         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 671         union acpi_object *obj;
 672
 673         status = acpi_get_handle(handle, "_EJD", &tmp);
 674         if (ACPI_FAILURE(status))
 675                 return status;
 676
 677         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 678         if (ACPI_SUCCESS(status)) {
 679                 obj = buffer.pointer;
 680                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 681                                          ejd);
 682                 kfree(buffer.pointer);
 683         }
 684         return status;
 685 }
 686 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 687
 688 void acpi_bus_data_handler(acpi_handle handle, void *context)
 689 {
 690
 691         /* TBD */
 692
 693         return;
 694 }
 695
 696 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 697 {
 698         device->performance.state = ACPI_STATE_UNKNOWN;
 699         return 0;
 700 }
 701
 702 static acpi_status
 703 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 704                                              union acpi_object *package)
 705 {
 706         int i = 0;
 707         union acpi_object *element = NULL;
 708
 709         if (!device || !package || (package->package.count < 2))
 710                 return AE_BAD_PARAMETER;
 711
 712         element = &(package->package.elements[0]);
 713         if (!element)
 714                 return AE_BAD_PARAMETER;
 715         if (element->type == ACPI_TYPE_PACKAGE) {
 716                 if ((element->package.count < 2) ||
 717                     (element->package.elements[0].type !=
 718                      ACPI_TYPE_LOCAL_REFERENCE)
 719                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 720                         return AE_BAD_DATA;
 721                 device->wakeup.gpe_device =
 722                     element->package.elements[0].reference.handle;
 723                 device->wakeup.gpe_number =
 724                     (u32) element->package.elements[1].integer.value;
 725         } else if (element->type == ACPI_TYPE_INTEGER) {
 726                 device->wakeup.gpe_number = element->integer.value;
 727         } else
 728                 return AE_BAD_DATA;
 729
 730         element = &(package->package.elements[1]);
 731         if (element->type != ACPI_TYPE_INTEGER) {
 732                 return AE_BAD_DATA;
 733         }
 734         device->wakeup.sleep_state = element->integer.value;
 735
 736         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 737                 return AE_NO_MEMORY;
 738         }
 739         device->wakeup.resources.count = package->package.count - 2;
 740         for (i = 0; i < device->wakeup.resources.count; i++) {
 741                 element = &(package->package.elements[i + 2]);
 742                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 743                         return AE_BAD_DATA;
 744
 745                 device->wakeup.resources.handles[i] = element->reference.handle;
 746         }
 747
 748         return AE_OK;
 749 }
 750
 751 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 752 {
 753         acpi_status status = 0;
 754         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 755         union acpi_object *package = NULL;
 756         int psw_error;
 757
 758         struct acpi_device_id button_device_ids[] = {
 759                 {"PNP0C0D", 0},
 760                 {"PNP0C0C", 0},
 761                 {"PNP0C0E", 0},
 762                 {"", 0},
 763         };
 764
 765         /* _PRW */
 766         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 767         if (ACPI_FAILURE(status)) {
 768                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 769                 goto end;
 770         }
 771
 772         package = (union acpi_object *)buffer.pointer;
 773         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 774         if (ACPI_FAILURE(status)) {
 775                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 776                 goto end;
 777         }
 778
 779         kfree(buffer.pointer);
 780
 781         device->wakeup.flags.valid = 1;
 782         device->wakeup.prepare_count = 0;
 783         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 784          * system for the ACPI device with the _PRW object.
 785          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 786          * So it is necessary to call _DSW object first. Only when it is not
 787          * present will the _PSW object used.
 788          */
 789         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 790         if (psw_error)
 791                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 792                                 "error in _DSW or _PSW evaluation\n"));
 793
 794         /* Power button, Lid switch always enable wakeup */
 795         if (!acpi_match_device_ids(device, button_device_ids))
 796                 device->wakeup.flags.run_wake = 1;
 797
 798 end:
 799         if (ACPI_FAILURE(status))
 800                 device->flags.wake_capable = 0;
 801         return 0;
 802 }
 803
 804 static int acpi_bus_get_power_flags(struct acpi_device *device)
 805 {
 806         acpi_status status = 0;
 807         acpi_handle handle = NULL;
 808         u32 i = 0;
 809
 810
 811         /*
 812          * Power Management Flags
 813          */
 814         status = acpi_get_handle(device->handle, "_PSC", &handle);
 815         if (ACPI_SUCCESS(status))
 816                 device->power.flags.explicit_get = 1;
 817         status = acpi_get_handle(device->handle, "_IRC", &handle);
 818         if (ACPI_SUCCESS(status))
 819                 device->power.flags.inrush_current = 1;
 820
 821         /*
 822          * Enumerate supported power management states
 823          */
 824         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 825                 struct acpi_device_power_state *ps = &device->power.states[i];
 826                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 827
 828                 /* Evaluate "_PRx" to se if power resources are referenced */
 829                 acpi_evaluate_reference(device->handle, object_name, NULL,
 830                                         &ps->resources);
 831                 if (ps->resources.count) {
 832                         device->power.flags.power_resources = 1;
 833                         ps->flags.valid = 1;
 834                 }
 835
 836                 /* Evaluate "_PSx" to see if we can do explicit sets */
 837                 object_name[2] = 'S';
 838                 status = acpi_get_handle(device->handle, object_name, &handle);
 839                 if (ACPI_SUCCESS(status)) {
 840                         ps->flags.explicit_set = 1;
 841                         ps->flags.valid = 1;
 842                 }
 843
 844                 /* State is valid if we have some power control */
 845                 if (ps->resources.count || ps->flags.explicit_set)
 846                         ps->flags.valid = 1;
 847
 848                 ps->power = -1; /* Unknown - driver assigned */
 849                 ps->latency = -1;       /* Unknown - driver assigned */
 850         }
 851
 852         /* Set defaults for D0 and D3 states (always valid) */
 853         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 854         device->power.states[ACPI_STATE_D0].power = 100;
 855         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 856         device->power.states[ACPI_STATE_D3].power = 0;
 857
 858         /* TBD: System wake support and resource requirements. */
 859
 860         device->power.state = ACPI_STATE_UNKNOWN;
 861         acpi_bus_get_power(device->handle, &(device->power.state));
 862
 863         return 0;
 864 }
 865
 866 static int acpi_bus_get_flags(struct acpi_device *device)
 867 {
 868         acpi_status status = AE_OK;
 869         acpi_handle temp = NULL;
 870
 871
 872         /* Presence of _STA indicates 'dynamic_status' */
 873         status = acpi_get_handle(device->handle, "_STA", &temp);
 874         if (ACPI_SUCCESS(status))
 875                 device->flags.dynamic_status = 1;
 876
 877         /* Presence of _CID indicates 'compatible_ids' */
 878         status = acpi_get_handle(device->handle, "_CID", &temp);
 879         if (ACPI_SUCCESS(status))
 880                 device->flags.compatible_ids = 1;
 881
 882         /* Presence of _RMV indicates 'removable' */
 883         status = acpi_get_handle(device->handle, "_RMV", &temp);
 884         if (ACPI_SUCCESS(status))
 885                 device->flags.removable = 1;
 886
 887         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 888         status = acpi_get_handle(device->handle, "_EJD", &temp);
 889         if (ACPI_SUCCESS(status))
 890                 device->flags.ejectable = 1;
 891         else {
 892                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 893                 if (ACPI_SUCCESS(status))
 894                         device->flags.ejectable = 1;
 895         }
 896
 897         /* Presence of _LCK indicates 'lockable' */
 898         status = acpi_get_handle(device->handle, "_LCK", &temp);
 899         if (ACPI_SUCCESS(status))
 900                 device->flags.lockable = 1;
 901
 902         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 903         status = acpi_get_handle(device->handle, "_PS0", &temp);
 904         if (ACPI_FAILURE(status))
 905                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 906         if (ACPI_SUCCESS(status))
 907                 device->flags.power_manageable = 1;
 908
 909         /* Presence of _PRW indicates wake capable */
 910         status = acpi_get_handle(device->handle, "_PRW", &temp);
 911         if (ACPI_SUCCESS(status))
 912                 device->flags.wake_capable = 1;
 913
 914         /* TBD: Performance management */
 915
 916         return 0;
 917 }
 918
 919 static void acpi_device_get_busid(struct acpi_device *device, int type)
 920 {
 921         char bus_id[5] = { '?', 0 };
 922         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 923         int i = 0;
 924
 925         /*
 926          * Bus ID
 927          * ------
 928          * The device's Bus ID is simply the object name.
 929          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 930          */
 931         switch (type) {
 932         case ACPI_BUS_TYPE_SYSTEM:
 933                 strcpy(device->pnp.bus_id, "ACPI");
 934                 break;
 935         case ACPI_BUS_TYPE_POWER_BUTTON:
 936                 strcpy(device->pnp.bus_id, "PWRF");
 937                 break;
 938         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 939                 strcpy(device->pnp.bus_id, "SLPF");
 940                 break;
 941         default:
 942                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
 943                 /* Clean up trailing underscores (if any) */
 944                 for (i = 3; i > 1; i--) {
 945                         if (bus_id[i] == '_')
 946                                 bus_id[i] = '\0';
 947                         else
 948                                 break;
 949                 }
 950                 strcpy(device->pnp.bus_id, bus_id);
 951                 break;
 952         }
 953 }
 954
 955 /*
 956  * acpi_bay_match - see if a device is an ejectable driver bay
 957  *
 958  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 959  * then we can safely call it an ejectable drive bay
 960  */
 961 static int acpi_bay_match(struct acpi_device *device){
 962         acpi_status status;
 963         acpi_handle handle;
 964         acpi_handle tmp;
 965         acpi_handle phandle;
 966
 967         handle = device->handle;
 968
 969         status = acpi_get_handle(handle, "_EJ0", &tmp);
 970         if (ACPI_FAILURE(status))
 971                 return -ENODEV;
 972
 973         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 974                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 975                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 976                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 977                 return 0;
 978
 979         if (acpi_get_parent(handle, &phandle))
 980                 return -ENODEV;
 981
 982         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 983                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 984                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 985                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 986                 return 0;
 987
 988         return -ENODEV;
 989 }
 990
 991 /*
 992  * acpi_dock_match - see if a device has a _DCK method
 993  */
 994 static int acpi_dock_match(struct acpi_device *device)
 995 {
 996         acpi_handle tmp;
 997         return acpi_get_handle(device->handle, "_DCK", &tmp);
 998 }
 999
1000 static struct acpica_device_id_list*
1001 acpi_add_cid(
1002         struct acpi_device_info         *info,
1003         struct acpica_device_id         *new_cid)
1004 {
1005         struct acpica_device_id_list    *cid;
1006         char                            *next_id_string;
1007         acpi_size                       cid_length;
1008         acpi_size                       new_cid_length;
1009         u32                             i;
1010
1011
1012         /* Allocate new CID list with room for the new CID */
1013
1014         if (!new_cid)
1015                 new_cid_length = info->compatible_id_list.list_size;
1016         else if (info->compatible_id_list.list_size)
1017                 new_cid_length = info->compatible_id_list.list_size +
1018                         new_cid->length + sizeof(struct acpica_device_id);
1019         else
1020                 new_cid_length = sizeof(struct acpica_device_id_list) + new_cid->length;
1021
1022         cid = ACPI_ALLOCATE_ZEROED(new_cid_length);
1023         if (!cid) {
1024                 return NULL;
1025         }
1026
1027         cid->list_size = new_cid_length;
1028         cid->count = info->compatible_id_list.count;
1029         if (new_cid)
1030                 cid->count++;
1031         next_id_string = (char *) cid->ids + (cid->count * sizeof(struct acpica_device_id));
1032
1033         /* Copy all existing CIDs */
1034
1035         for (i = 0; i < info->compatible_id_list.count; i++) {
1036                 cid_length = info->compatible_id_list.ids[i].length;
1037                 cid->ids[i].string = next_id_string;
1038                 cid->ids[i].length = cid_length;
1039
1040                 ACPI_MEMCPY(next_id_string, info->compatible_id_list.ids[i].string,
1041                         cid_length);
1042
1043                 next_id_string += cid_length;
1044         }
1045
1046         /* Append the new CID */
1047
1048         if (new_cid) {
1049                 cid->ids[i].string = next_id_string;
1050                 cid->ids[i].length = new_cid->length;
1051
1052                 ACPI_MEMCPY(next_id_string, new_cid->string, new_cid->length);
1053         }
1054
1055         return cid;
1056 }
1057
1058 static void acpi_device_set_id(struct acpi_device *device, int type)
1059 {
1060         struct acpi_device_info *info = NULL;
1061         char *hid = NULL;
1062         char *uid = NULL;
1063         struct acpica_device_id_list *cid_list = NULL;
1064         char *cid_add = NULL;
1065         acpi_status status;
1066
1067         switch (type) {
1068         case ACPI_BUS_TYPE_DEVICE:
1069                 status = acpi_get_object_info(device->handle, &info);
1070                 if (ACPI_FAILURE(status)) {
1071                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1072                         return;
1073                 }
1074
1075                 if (info->valid & ACPI_VALID_HID)
1076                         hid = info->hardware_id.string;
1077                 if (info->valid & ACPI_VALID_UID)
1078                         uid = info->unique_id.string;
1079                 if (info->valid & ACPI_VALID_CID)
1080                         cid_list = &info->compatible_id_list;
1081                 if (info->valid & ACPI_VALID_ADR) {
1082                         device->pnp.bus_address = info->address;
1083                         device->flags.bus_address = 1;
1084                 }
1085
1086                 /* If we have a video/bay/dock device, add our selfdefined
1087                    HID to the CID list. Like that the video/bay/dock drivers
1088                    will get autoloaded and the device might still match
1089                    against another driver.
1090                 */
1091                 if (acpi_is_video_device(device))
1092                         cid_add = ACPI_VIDEO_HID;
1093                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1094                         cid_add = ACPI_BAY_HID;
1095                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1096                         cid_add = ACPI_DOCK_HID;
1097
1098                 break;
1099         case ACPI_BUS_TYPE_POWER:
1100                 hid = ACPI_POWER_HID;
1101                 break;
1102         case ACPI_BUS_TYPE_PROCESSOR:
1103                 hid = ACPI_PROCESSOR_OBJECT_HID;
1104                 break;
1105         case ACPI_BUS_TYPE_SYSTEM:
1106                 hid = ACPI_SYSTEM_HID;
1107                 break;
1108         case ACPI_BUS_TYPE_THERMAL:
1109                 hid = ACPI_THERMAL_HID;
1110                 break;
1111         case ACPI_BUS_TYPE_POWER_BUTTON:
1112                 hid = ACPI_BUTTON_HID_POWERF;
1113                 break;
1114         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1115                 hid = ACPI_BUTTON_HID_SLEEPF;
1116                 break;
1117         }
1118
1119         /*
1120          * \_SB
1121          * ----
1122          * Fix for the system root bus device -- the only root-level device.
1123          */
1124         if (((acpi_handle)device->parent == ACPI_ROOT_OBJECT) &&
1125              (type == ACPI_BUS_TYPE_DEVICE)) {
1126                 hid = ACPI_BUS_HID;
1127                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1128                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1129         }
1130
1131         if (hid) {
1132                 device->pnp.hardware_id = ACPI_ALLOCATE_ZEROED(strlen (hid) + 1);
1133                 if (device->pnp.hardware_id) {
1134                         strcpy(device->pnp.hardware_id, hid);
1135                         device->flags.hardware_id = 1;
1136                 }
1137         }
1138         if (!device->flags.hardware_id)
1139                 device->pnp.hardware_id = "";
1140
1141         if (uid) {
1142                 device->pnp.unique_id = ACPI_ALLOCATE_ZEROED(strlen (uid) + 1);
1143                 if (device->pnp.unique_id) {
1144                         strcpy(device->pnp.unique_id, uid);
1145                         device->flags.unique_id = 1;
1146                 }
1147         }
1148         if (!device->flags.unique_id)
1149                 device->pnp.unique_id = "";
1150
1151         if (cid_list || cid_add) {
1152                 struct acpica_device_id_list *list;
1153
1154                 if (cid_add) {
1155                         struct acpica_device_id cid;
1156                         cid.length = strlen (cid_add) + 1;
1157                         cid.string = cid_add;
1158
1159                         list = acpi_add_cid(info, &cid);
1160                 } else {
1161                         list = acpi_add_cid(info, NULL);
1162                 }
1163
1164                 if (list) {
1165                         device->pnp.cid_list = list;
1166                         if (cid_add)
1167                                 device->flags.compatible_ids = 1;
1168                 }
1169         }
1170
1171         kfree(info);
1172 }
1173
1174 static int acpi_device_set_context(struct acpi_device *device, int type)
1175 {
1176         acpi_status status = AE_OK;
1177         int result = 0;
1178         /*
1179          * Context
1180          * -------
1181          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1182          * resolutions from handle->device very efficient.  Note that we need
1183          * to be careful with fixed-feature devices as they all attach to the
1184          * root object.
1185          */
1186         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1187             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1188                 status = acpi_attach_data(device->handle,
1189                                           acpi_bus_data_handler, device);
1190
1191                 if (ACPI_FAILURE(status)) {
1192                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1193                         result = -ENODEV;
1194                 }
1195         }
1196         return result;
1197 }
1198
1199 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1200 {
1201         if (!dev)
1202                 return -EINVAL;
1203
1204         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1205         device_release_driver(&dev->dev);
1206
1207         if (!rmdevice)
1208                 return 0;
1209
1210         /*
1211          * unbind _ADR-Based Devices when hot removal
1212          */
1213         if (dev->flags.bus_address) {
1214                 if ((dev->parent) && (dev->parent->ops.unbind))
1215                         dev->parent->ops.unbind(dev);
1216         }
1217         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1218
1219         return 0;
1220 }
1221
1222 static int
1223 acpi_add_single_object(struct acpi_device **child,
1224                        struct acpi_device *parent, acpi_handle handle, int type,
1225                         struct acpi_bus_ops *ops)
1226 {
1227         int result = 0;
1228         struct acpi_device *device = NULL;
1229         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1230
1231
1232         if (!child)
1233                 return -EINVAL;
1234
1235         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1236         if (!device) {
1237                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1238                 return -ENOMEM;
1239         }
1240
1241         device->device_type = type;
1242         device->handle = handle;
1243         device->parent = parent;
1244         device->bus_ops = *ops; /* workround for not call .start */
1245
1246         acpi_device_get_busid(device, type);
1247
1248         /*
1249          * Flags
1250          * -----
1251          * Get prior to calling acpi_bus_get_status() so we know whether
1252          * or not _STA is present.  Note that we only look for object
1253          * handles -- cannot evaluate objects until we know the device is
1254          * present and properly initialized.
1255          */
1256         result = acpi_bus_get_flags(device);
1257         if (result)
1258                 goto end;
1259
1260         /*
1261          * Status
1262          * ------
1263          * See if the device is present.  We always assume that non-Device
1264          * and non-Processor objects (e.g. thermal zones, power resources,
1265          * etc.) are present, functioning, etc. (at least when parent object
1266          * is present).  Note that _STA has a different meaning for some
1267          * objects (e.g. power resources) so we need to be careful how we use
1268          * it.
1269          */
1270         switch (type) {
1271         case ACPI_BUS_TYPE_PROCESSOR:
1272         case ACPI_BUS_TYPE_DEVICE:
1273                 result = acpi_bus_get_status(device);
1274                 if (ACPI_FAILURE(result)) {
1275                         result = -ENODEV;
1276                         goto end;
1277                 }
1278                 /*
1279                  * When the device is neither present nor functional, the
1280                  * device should not be added to Linux ACPI device tree.
1281                  * When the status of the device is not present but functinal,
1282                  * it should be added to Linux ACPI tree. For example : bay
1283                  * device , dock device.
1284                  * In such conditions it is unncessary to check whether it is
1285                  * bay device or dock device.
1286                  */
1287                 if (!device->status.present && !device->status.functional) {
1288                         result = -ENODEV;
1289                         goto end;
1290                 }
1291                 break;
1292         default:
1293                 STRUCT_TO_INT(device->status) =
1294                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1295                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1296                 break;
1297         }
1298
1299         /*
1300          * Initialize Device
1301          * -----------------
1302          * TBD: Synch with Core's enumeration/initialization process.
1303          */
1304
1305         /*
1306          * Hardware ID, Unique ID, & Bus Address
1307          * -------------------------------------
1308          */
1309         acpi_device_set_id(device, type);
1310
1311         /*
1312          * Power Management
1313          * ----------------
1314          */
1315         if (device->flags.power_manageable) {
1316                 result = acpi_bus_get_power_flags(device);
1317                 if (result)
1318                         goto end;
1319         }
1320
1321         /*
1322          * Wakeup device management
1323          *-----------------------
1324          */
1325         if (device->flags.wake_capable) {
1326                 result = acpi_bus_get_wakeup_device_flags(device);
1327                 if (result)
1328                         goto end;
1329         }
1330
1331         /*
1332          * Performance Management
1333          * ----------------------
1334          */
1335         if (device->flags.performance_manageable) {
1336                 result = acpi_bus_get_perf_flags(device);
1337                 if (result)
1338                         goto end;
1339         }
1340
1341         if ((result = acpi_device_set_context(device, type)))
1342                 goto end;
1343
1344         result = acpi_device_register(device);
1345
1346         /*
1347          * Bind _ADR-Based Devices when hot add
1348          */
1349         if (device->flags.bus_address) {
1350                 if (device->parent && device->parent->ops.bind)
1351                         device->parent->ops.bind(device);
1352         }
1353
1354 end:
1355         if (!result) {
1356                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1357                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1358                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1359                          (char *) buffer.pointer,
1360                          device->parent ? dev_name(&device->parent->dev) :
1361                                           "(null)"));
1362                 kfree(buffer.pointer);
1363                 *child = device;
1364         } else
1365                 acpi_device_release(&device->dev);
1366
1367         return result;
1368 }
1369
1370 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1371 {
1372         acpi_status status = AE_OK;
1373         struct acpi_device *parent = NULL;
1374         struct acpi_device *child = NULL;
1375         acpi_handle phandle = NULL;
1376         acpi_handle chandle = NULL;
1377         acpi_object_type type = 0;
1378         u32 level = 1;
1379
1380
1381         if (!start)
1382                 return -EINVAL;
1383
1384         parent = start;
1385         phandle = start->handle;
1386
1387         /*
1388          * Parse through the ACPI namespace, identify all 'devices', and
1389          * create a new 'struct acpi_device' for each.
1390          */
1391         while ((level > 0) && parent) {
1392
1393                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1394                                               chandle, &chandle);
1395
1396                 /*
1397                  * If this scope is exhausted then move our way back up.
1398                  */
1399                 if (ACPI_FAILURE(status)) {
1400                         level--;
1401                         chandle = phandle;
1402                         acpi_get_parent(phandle, &phandle);
1403                         if (parent->parent)
1404                                 parent = parent->parent;
1405                         continue;
1406                 }
1407
1408                 status = acpi_get_type(chandle, &type);
1409                 if (ACPI_FAILURE(status))
1410                         continue;
1411
1412                 /*
1413                  * If this is a scope object then parse it (depth-first).
1414                  */
1415                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1416                         level++;
1417                         phandle = chandle;
1418                         chandle = NULL;
1419                         continue;
1420                 }
1421
1422                 /*
1423                  * We're only interested in objects that we consider 'devices'.
1424                  */
1425                 switch (type) {
1426                 case ACPI_TYPE_DEVICE:
1427                         type = ACPI_BUS_TYPE_DEVICE;
1428                         break;
1429                 case ACPI_TYPE_PROCESSOR:
1430                         type = ACPI_BUS_TYPE_PROCESSOR;
1431                         break;
1432                 case ACPI_TYPE_THERMAL:
1433                         type = ACPI_BUS_TYPE_THERMAL;
1434                         break;
1435                 case ACPI_TYPE_POWER:
1436                         type = ACPI_BUS_TYPE_POWER;
1437                         break;
1438                 default:
1439                         continue;
1440                 }
1441
1442                 if (ops->acpi_op_add)
1443                         status = acpi_add_single_object(&child, parent,
1444                                 chandle, type, ops);
1445                 else
1446                         status = acpi_bus_get_device(chandle, &child);
1447
1448                 if (ACPI_FAILURE(status))
1449                         continue;
1450
1451                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1452                         status = acpi_start_single_object(child);
1453                         if (ACPI_FAILURE(status))
1454                                 continue;
1455                 }
1456
1457                 /*
1458                  * If the device is present, enabled, and functioning then
1459                  * parse its scope (depth-first).  Note that we need to
1460                  * represent absent devices to facilitate PnP notifications
1461                  * -- but only the subtree head (not all of its children,
1462                  * which will be enumerated when the parent is inserted).
1463                  *
1464                  * TBD: Need notifications and other detection mechanisms
1465                  *      in place before we can fully implement this.
1466                  */
1467                  /*
1468                  * When the device is not present but functional, it is also
1469                  * necessary to scan the children of this device.
1470                  */
1471                 if (child->status.present || (!child->status.present &&
1472                                         child->status.functional)) {
1473                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1474                                                       NULL, NULL);
1475                         if (ACPI_SUCCESS(status)) {
1476                                 level++;
1477                                 phandle = chandle;
1478                                 chandle = NULL;
1479                                 parent = child;
1480                         }
1481                 }
1482         }
1483
1484         return 0;
1485 }
1486
1487 int
1488 acpi_bus_add(struct acpi_device **child,
1489              struct acpi_device *parent, acpi_handle handle, int type)
1490 {
1491         int result;
1492         struct acpi_bus_ops ops;
1493
1494         memset(&ops, 0, sizeof(ops));
1495         ops.acpi_op_add = 1;
1496
1497         result = acpi_add_single_object(child, parent, handle, type, &ops);
1498         if (!result)
1499                 result = acpi_bus_scan(*child, &ops);
1500
1501         return result;
1502 }
1503 EXPORT_SYMBOL(acpi_bus_add);
1504
1505 int acpi_bus_start(struct acpi_device *device)
1506 {
1507         int result;
1508         struct acpi_bus_ops ops;
1509
1510
1511         if (!device)
1512                 return -EINVAL;
1513
1514         result = acpi_start_single_object(device);
1515         if (!result) {
1516                 memset(&ops, 0, sizeof(ops));
1517                 ops.acpi_op_start = 1;
1518                 result = acpi_bus_scan(device, &ops);
1519         }
1520         return result;
1521 }
1522 EXPORT_SYMBOL(acpi_bus_start);
1523
1524 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1525 {
1526         acpi_status status;
1527         struct acpi_device *parent, *child;
1528         acpi_handle phandle, chandle;
1529         acpi_object_type type;
1530         u32 level = 1;
1531         int err = 0;
1532
1533         parent = start;
1534         phandle = start->handle;
1535         child = chandle = NULL;
1536
1537         while ((level > 0) && parent && (!err)) {
1538                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1539                                               chandle, &chandle);
1540
1541                 /*
1542                  * If this scope is exhausted then move our way back up.
1543                  */
1544                 if (ACPI_FAILURE(status)) {
1545                         level--;
1546                         chandle = phandle;
1547                         acpi_get_parent(phandle, &phandle);
1548                         child = parent;
1549                         parent = parent->parent;
1550
1551                         if (level == 0)
1552                                 err = acpi_bus_remove(child, rmdevice);
1553                         else
1554                                 err = acpi_bus_remove(child, 1);
1555
1556                         continue;
1557                 }
1558
1559                 status = acpi_get_type(chandle, &type);
1560                 if (ACPI_FAILURE(status)) {
1561                         continue;
1562                 }
1563                 /*
1564                  * If there is a device corresponding to chandle then
1565                  * parse it (depth-first).
1566                  */
1567                 if (acpi_bus_get_device(chandle, &child) == 0) {
1568                         level++;
1569                         phandle = chandle;
1570                         chandle = NULL;
1571                         parent = child;
1572                 }
1573                 continue;
1574         }
1575         return err;
1576 }
1577 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1578
1579 static int acpi_bus_scan_fixed(void)
1580 {
1581         int result = 0;
1582         struct acpi_device *device = NULL;
1583         struct acpi_bus_ops ops;
1584
1585         memset(&ops, 0, sizeof(ops));
1586         ops.acpi_op_add = 1;
1587         ops.acpi_op_start = 1;
1588
1589         /*
1590          * Enumerate all fixed-feature devices.
1591          */
1592         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1593                 result = acpi_add_single_object(&device, acpi_root,
1594                                                 NULL,
1595                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1596                                                 &ops);
1597         }
1598
1599         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1600                 result = acpi_add_single_object(&device, acpi_root,
1601                                                 NULL,
1602                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1603                                                 &ops);
1604         }
1605
1606         return result;
1607 }
1608
1609 int __init acpi_scan_init(void)
1610 {
1611         int result;
1612         struct acpi_bus_ops ops;
1613
1614         memset(&ops, 0, sizeof(ops));
1615         ops.acpi_op_add = 1;
1616         ops.acpi_op_start = 1;
1617
1618         result = bus_register(&acpi_bus_type);
1619         if (result) {
1620                 /* We don't want to quit even if we failed to add suspend/resume */
1621                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1622         }
1623
1624         /*
1625          * Create the root device in the bus's device tree
1626          */
1627         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1628                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1629         if (result)
1630                 goto Done;
1631
1632         /*
1633          * Enumerate devices in the ACPI namespace.
1634          */
1635         result = acpi_bus_scan_fixed();
1636
1637         if (!result)
1638                 result = acpi_bus_scan(acpi_root, &ops);
1639
1640         if (result)
1641                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1642
1643 Done:
1644         return result;
1645 }