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 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  26
  27 static LIST_HEAD(acpi_device_list);
  28 static LIST_HEAD(acpi_bus_id_list);
  29 DEFINE_MUTEX(acpi_device_lock);
  30 LIST_HEAD(acpi_wakeup_device_list);
  31
  32 struct acpi_device_bus_id{
  33         char bus_id[15];
  34         unsigned int instance_no;
  35         struct list_head node;
  36 };
  37
  38 /*
  39  * Creates hid/cid(s) string needed for modalias and uevent
  40  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  41  * char *modalias: "acpi:IBM0001:ACPI0001"
  42 */
  43 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  44                            int size)
  45 {
  46         int len;
  47         int count;
  48
  49         if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
  50                 return -ENODEV;
  51
  52         len = snprintf(modalias, size, "acpi:");
  53         size -= len;
  54
  55         if (acpi_dev->flags.hardware_id) {
  56                 count = snprintf(&modalias[len], size, "%s:",
  57                                  acpi_dev->pnp.hardware_id);
  58                 if (count < 0 || count >= size)
  59                         return -EINVAL;
  60                 len += count;
  61                 size -= count;
  62         }
  63
  64         if (acpi_dev->flags.compatible_ids) {
  65                 struct acpica_device_id_list *cid_list;
  66                 int i;
  67
  68                 cid_list = acpi_dev->pnp.cid_list;
  69                 for (i = 0; i < cid_list->count; i++) {
  70                         count = snprintf(&modalias[len], size, "%s:",
  71                                          cid_list->ids[i].string);
  72                         if (count < 0 || count >= size) {
  73                                 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
  74                                        acpi_dev->pnp.device_name, i);
  75                                 break;
  76                         }
  77                         len += count;
  78                         size -= count;
  79                 }
  80         }
  81
  82         modalias[len] = '\0';
  83         return len;
  84 }
  85
  86 static ssize_t
  87 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  88         struct acpi_device *acpi_dev = to_acpi_device(dev);
  89         int len;
  90
  91         /* Device has no HID and no CID or string is >1024 */
  92         len = create_modalias(acpi_dev, buf, 1024);
  93         if (len <= 0)
  94                 return 0;
  95         buf[len++] = '\n';
  96         return len;
  97 }
  98 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  99
 100 static void acpi_bus_hot_remove_device(void *context)
 101 {
 102         struct acpi_device *device;
 103         acpi_handle handle = context;
 104         struct acpi_object_list arg_list;
 105         union acpi_object arg;
 106         acpi_status status = AE_OK;
 107
 108         if (acpi_bus_get_device(handle, &device))
 109                 return;
 110
 111         if (!device)
 112                 return;
 113
 114         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 115                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 116
 117         if (acpi_bus_trim(device, 1)) {
 118                 printk(KERN_ERR PREFIX
 119                                 "Removing device failed\n");
 120                 return;
 121         }
 122
 123         /* power off device */
 124         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 125         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 126                 printk(KERN_WARNING PREFIX
 127                                 "Power-off device failed\n");
 128
 129         if (device->flags.lockable) {
 130                 arg_list.count = 1;
 131                 arg_list.pointer = &arg;
 132                 arg.type = ACPI_TYPE_INTEGER;
 133                 arg.integer.value = 0;
 134                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 135         }
 136
 137         arg_list.count = 1;
 138         arg_list.pointer = &arg;
 139         arg.type = ACPI_TYPE_INTEGER;
 140         arg.integer.value = 1;
 141
 142         /*
 143          * TBD: _EJD support.
 144          */
 145         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 146         if (ACPI_FAILURE(status))
 147                 printk(KERN_WARNING PREFIX
 148                                 "Eject device failed\n");
 149
 150         return;
 151 }
 152
 153 static ssize_t
 154 acpi_eject_store(struct device *d, struct device_attribute *attr,
 155                 const char *buf, size_t count)
 156 {
 157         int ret = count;
 158         acpi_status status;
 159         acpi_object_type type = 0;
 160         struct acpi_device *acpi_device = to_acpi_device(d);
 161
 162         if ((!count) || (buf[0] != '1')) {
 163                 return -EINVAL;
 164         }
 165 #ifndef FORCE_EJECT
 166         if (acpi_device->driver == NULL) {
 167                 ret = -ENODEV;
 168                 goto err;
 169         }
 170 #endif
 171         status = acpi_get_type(acpi_device->handle, &type);
 172         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 173                 ret = -ENODEV;
 174                 goto err;
 175         }
 176
 177         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
 178 err:
 179         return ret;
 180 }
 181
 182 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 183
 184 static ssize_t
 185 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 186         struct acpi_device *acpi_dev = to_acpi_device(dev);
 187
 188         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
 189 }
 190 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 191
 192 static ssize_t
 193 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 194         struct acpi_device *acpi_dev = to_acpi_device(dev);
 195         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 196         int result;
 197
 198         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 199         if (result)
 200                 goto end;
 201
 202         result = sprintf(buf, "%s\n", (char*)path.pointer);
 203         kfree(path.pointer);
 204 end:
 205         return result;
 206 }
 207 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 208
 209 static int acpi_device_setup_files(struct acpi_device *dev)
 210 {
 211         acpi_status status;
 212         acpi_handle temp;
 213         int result = 0;
 214
 215         /*
 216          * Devices gotten from FADT don't have a "path" attribute
 217          */
 218         if (dev->handle) {
 219                 result = device_create_file(&dev->dev, &dev_attr_path);
 220                 if (result)
 221                         goto end;
 222         }
 223
 224         if (dev->flags.hardware_id) {
 225                 result = device_create_file(&dev->dev, &dev_attr_hid);
 226                 if (result)
 227                         goto end;
 228         }
 229
 230         if (dev->flags.hardware_id || dev->flags.compatible_ids) {
 231                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 232                 if (result)
 233                         goto end;
 234         }
 235
 236         /*
 237          * If device has _EJ0, 'eject' file is created that is used to trigger
 238          * hot-removal function from userland.
 239          */
 240         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 241         if (ACPI_SUCCESS(status))
 242                 result = device_create_file(&dev->dev, &dev_attr_eject);
 243 end:
 244         return result;
 245 }
 246
 247 static void acpi_device_remove_files(struct acpi_device *dev)
 248 {
 249         acpi_status status;
 250         acpi_handle temp;
 251
 252         /*
 253          * If device has _EJ0, 'eject' file is created that is used to trigger
 254          * hot-removal function from userland.
 255          */
 256         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 257         if (ACPI_SUCCESS(status))
 258                 device_remove_file(&dev->dev, &dev_attr_eject);
 259
 260         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 261                 device_remove_file(&dev->dev, &dev_attr_modalias);
 262
 263         if (dev->flags.hardware_id)
 264                 device_remove_file(&dev->dev, &dev_attr_hid);
 265         if (dev->handle)
 266                 device_remove_file(&dev->dev, &dev_attr_path);
 267 }
 268 /* --------------------------------------------------------------------------
 269                         ACPI Bus operations
 270    -------------------------------------------------------------------------- */
 271
 272 int acpi_match_device_ids(struct acpi_device *device,
 273                           const struct acpi_device_id *ids)
 274 {
 275         const struct acpi_device_id *id;
 276
 277         /*
 278          * If the device is not present, it is unnecessary to load device
 279          * driver for it.
 280          */
 281         if (!device->status.present)
 282                 return -ENODEV;
 283
 284         if (device->flags.hardware_id) {
 285                 for (id = ids; id->id[0]; id++) {
 286                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 287                                 return 0;
 288                 }
 289         }
 290
 291         if (device->flags.compatible_ids) {
 292                 struct acpica_device_id_list *cid_list = device->pnp.cid_list;
 293                 int i;
 294
 295                 for (id = ids; id->id[0]; id++) {
 296                         /* compare multiple _CID entries against driver ids */
 297                         for (i = 0; i < cid_list->count; i++) {
 298                                 if (!strcmp((char*)id->id,
 299                                             cid_list->ids[i].string))
 300                                         return 0;
 301                         }
 302                 }
 303         }
 304
 305         return -ENOENT;
 306 }
 307 EXPORT_SYMBOL(acpi_match_device_ids);
 308
 309 static void acpi_device_release(struct device *dev)
 310 {
 311         struct acpi_device *acpi_dev = to_acpi_device(dev);
 312
 313         kfree(acpi_dev->pnp.cid_list);
 314         if (acpi_dev->flags.hardware_id)
 315                 kfree(acpi_dev->pnp.hardware_id);
 316         if (acpi_dev->flags.unique_id)
 317                 kfree(acpi_dev->pnp.unique_id);
 318         kfree(acpi_dev);
 319 }
 320
 321 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 322 {
 323         struct acpi_device *acpi_dev = to_acpi_device(dev);
 324         struct acpi_driver *acpi_drv = acpi_dev->driver;
 325
 326         if (acpi_drv && acpi_drv->ops.suspend)
 327                 return acpi_drv->ops.suspend(acpi_dev, state);
 328         return 0;
 329 }
 330
 331 static int acpi_device_resume(struct device *dev)
 332 {
 333         struct acpi_device *acpi_dev = to_acpi_device(dev);
 334         struct acpi_driver *acpi_drv = acpi_dev->driver;
 335
 336         if (acpi_drv && acpi_drv->ops.resume)
 337                 return acpi_drv->ops.resume(acpi_dev);
 338         return 0;
 339 }
 340
 341 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 342 {
 343         struct acpi_device *acpi_dev = to_acpi_device(dev);
 344         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 345
 346         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 347 }
 348
 349 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 350 {
 351         struct acpi_device *acpi_dev = to_acpi_device(dev);
 352         int len;
 353
 354         if (add_uevent_var(env, "MODALIAS="))
 355                 return -ENOMEM;
 356         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 357                               sizeof(env->buf) - env->buflen);
 358         if (len >= (sizeof(env->buf) - env->buflen))
 359                 return -ENOMEM;
 360         env->buflen += len;
 361         return 0;
 362 }
 363
 364 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 365 {
 366         struct acpi_device *device = data;
 367
 368         device->driver->ops.notify(device, event);
 369 }
 370
 371 static acpi_status acpi_device_notify_fixed(void *data)
 372 {
 373         struct acpi_device *device = data;
 374
 375         /* Fixed hardware devices have no handles */
 376         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 377         return AE_OK;
 378 }
 379
 380 static int acpi_device_install_notify_handler(struct acpi_device *device)
 381 {
 382         acpi_status status;
 383
 384         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 385                 status =
 386                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 387                                                      acpi_device_notify_fixed,
 388                                                      device);
 389         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 390                 status =
 391                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 392                                                      acpi_device_notify_fixed,
 393                                                      device);
 394         else
 395                 status = acpi_install_notify_handler(device->handle,
 396                                                      ACPI_DEVICE_NOTIFY,
 397                                                      acpi_device_notify,
 398                                                      device);
 399
 400         if (ACPI_FAILURE(status))
 401                 return -EINVAL;
 402         return 0;
 403 }
 404
 405 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 406 {
 407         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 408                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 409                                                 acpi_device_notify_fixed);
 410         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 411                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 412                                                 acpi_device_notify_fixed);
 413         else
 414                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 415                                            acpi_device_notify);
 416 }
 417
 418 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 419 static int acpi_start_single_object(struct acpi_device *);
 420 static int acpi_device_probe(struct device * dev)
 421 {
 422         struct acpi_device *acpi_dev = to_acpi_device(dev);
 423         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 424         int ret;
 425
 426         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 427         if (!ret) {
 428                 if (acpi_dev->bus_ops.acpi_op_start)
 429                         acpi_start_single_object(acpi_dev);
 430
 431                 if (acpi_drv->ops.notify) {
 432                         ret = acpi_device_install_notify_handler(acpi_dev);
 433                         if (ret) {
 434                                 if (acpi_drv->ops.remove)
 435                                         acpi_drv->ops.remove(acpi_dev,
 436                                                      acpi_dev->removal_type);
 437                                 return ret;
 438                         }
 439                 }
 440
 441                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 442                         "Found driver [%s] for device [%s]\n",
 443                         acpi_drv->name, acpi_dev->pnp.bus_id));
 444                 get_device(dev);
 445         }
 446         return ret;
 447 }
 448
 449 static int acpi_device_remove(struct device * dev)
 450 {
 451         struct acpi_device *acpi_dev = to_acpi_device(dev);
 452         struct acpi_driver *acpi_drv = acpi_dev->driver;
 453
 454         if (acpi_drv) {
 455                 if (acpi_drv->ops.notify)
 456                         acpi_device_remove_notify_handler(acpi_dev);
 457                 if (acpi_drv->ops.remove)
 458                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 459         }
 460         acpi_dev->driver = NULL;
 461         acpi_dev->driver_data = NULL;
 462
 463         put_device(dev);
 464         return 0;
 465 }
 466
 467 struct bus_type acpi_bus_type = {
 468         .name           = "acpi",
 469         .suspend        = acpi_device_suspend,
 470         .resume         = acpi_device_resume,
 471         .match          = acpi_bus_match,
 472         .probe          = acpi_device_probe,
 473         .remove         = acpi_device_remove,
 474         .uevent         = acpi_device_uevent,
 475 };
 476
 477 static int acpi_device_register(struct acpi_device *device)
 478 {
 479         int result;
 480         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 481         int found = 0;
 482
 483         /*
 484          * Linkage
 485          * -------
 486          * Link this device to its parent and siblings.
 487          */
 488         INIT_LIST_HEAD(&device->children);
 489         INIT_LIST_HEAD(&device->node);
 490         INIT_LIST_HEAD(&device->wakeup_list);
 491
 492         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 493         if (!new_bus_id) {
 494                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 495                 return -ENOMEM;
 496         }
 497
 498         mutex_lock(&acpi_device_lock);
 499         /*
 500          * Find suitable bus_id and instance number in acpi_bus_id_list
 501          * If failed, create one and link it into acpi_bus_id_list
 502          */
 503         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 504                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 505                         acpi_device_bus_id->instance_no ++;
 506                         found = 1;
 507                         kfree(new_bus_id);
 508                         break;
 509                 }
 510         }
 511         if (!found) {
 512                 acpi_device_bus_id = new_bus_id;
 513                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 514                 acpi_device_bus_id->instance_no = 0;
 515                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 516         }
 517         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 518
 519         if (device->parent)
 520                 list_add_tail(&device->node, &device->parent->children);
 521
 522         if (device->wakeup.flags.valid)
 523                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 524         mutex_unlock(&acpi_device_lock);
 525
 526         if (device->parent)
 527                 device->dev.parent = &device->parent->dev;
 528         device->dev.bus = &acpi_bus_type;
 529         device->dev.release = &acpi_device_release;
 530         result = device_register(&device->dev);
 531         if (result) {
 532                 dev_err(&device->dev, "Error registering device\n");
 533                 goto end;
 534         }
 535
 536         result = acpi_device_setup_files(device);
 537         if (result)
 538                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 539                        dev_name(&device->dev));
 540
 541         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 542         return 0;
 543 end:
 544         mutex_lock(&acpi_device_lock);
 545         if (device->parent)
 546                 list_del(&device->node);
 547         list_del(&device->wakeup_list);
 548         mutex_unlock(&acpi_device_lock);
 549         return result;
 550 }
 551
 552 static void acpi_device_unregister(struct acpi_device *device, int type)
 553 {
 554         mutex_lock(&acpi_device_lock);
 555         if (device->parent)
 556                 list_del(&device->node);
 557
 558         list_del(&device->wakeup_list);
 559         mutex_unlock(&acpi_device_lock);
 560
 561         acpi_detach_data(device->handle, acpi_bus_data_handler);
 562
 563         acpi_device_remove_files(device);
 564         device_unregister(&device->dev);
 565 }
 566
 567 /* --------------------------------------------------------------------------
 568                                  Driver Management
 569    -------------------------------------------------------------------------- */
 570 /**
 571  * acpi_bus_driver_init - add a device to a driver
 572  * @device: the device to add and initialize
 573  * @driver: driver for the device
 574  *
 575  * Used to initialize a device via its device driver.  Called whenever a
 576  * driver is bound to a device.  Invokes the driver's add() ops.
 577  */
 578 static int
 579 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 580 {
 581         int result = 0;
 582
 583         if (!device || !driver)
 584                 return -EINVAL;
 585
 586         if (!driver->ops.add)
 587                 return -ENOSYS;
 588
 589         result = driver->ops.add(device);
 590         if (result) {
 591                 device->driver = NULL;
 592                 device->driver_data = NULL;
 593                 return result;
 594         }
 595
 596         device->driver = driver;
 597
 598         /*
 599          * TBD - Configuration Management: Assign resources to device based
 600          * upon possible configuration and currently allocated resources.
 601          */
 602
 603         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 604                           "Driver successfully bound to device\n"));
 605         return 0;
 606 }
 607
 608 static int acpi_start_single_object(struct acpi_device *device)
 609 {
 610         int result = 0;
 611         struct acpi_driver *driver;
 612
 613
 614         if (!(driver = device->driver))
 615                 return 0;
 616
 617         if (driver->ops.start) {
 618                 result = driver->ops.start(device);
 619                 if (result && driver->ops.remove)
 620                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 621         }
 622
 623         return result;
 624 }
 625
 626 /**
 627  * acpi_bus_register_driver - register a driver with the ACPI bus
 628  * @driver: driver being registered
 629  *
 630  * Registers a driver with the ACPI bus.  Searches the namespace for all
 631  * devices that match the driver's criteria and binds.  Returns zero for
 632  * success or a negative error status for failure.
 633  */
 634 int acpi_bus_register_driver(struct acpi_driver *driver)
 635 {
 636         int ret;
 637
 638         if (acpi_disabled)
 639                 return -ENODEV;
 640         driver->drv.name = driver->name;
 641         driver->drv.bus = &acpi_bus_type;
 642         driver->drv.owner = driver->owner;
 643
 644         ret = driver_register(&driver->drv);
 645         return ret;
 646 }
 647
 648 EXPORT_SYMBOL(acpi_bus_register_driver);
 649
 650 /**
 651  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 652  * @driver: driver to unregister
 653  *
 654  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 655  * devices that match the driver's criteria and unbinds.
 656  */
 657 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 658 {
 659         driver_unregister(&driver->drv);
 660 }
 661
 662 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 663
 664 /* --------------------------------------------------------------------------
 665                                  Device Enumeration
 666    -------------------------------------------------------------------------- */
 667 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 668 {
 669         acpi_status status;
 670         int ret;
 671         struct acpi_device *device;
 672
 673         /*
 674          * Fixed hardware devices do not appear in the namespace and do not
 675          * have handles, but we fabricate acpi_devices for them, so we have
 676          * to deal with them specially.
 677          */
 678         if (handle == NULL)
 679                 return acpi_root;
 680
 681         do {
 682                 status = acpi_get_parent(handle, &handle);
 683                 if (status == AE_NULL_ENTRY)
 684                         return NULL;
 685                 if (ACPI_FAILURE(status))
 686                         return acpi_root;
 687
 688                 ret = acpi_bus_get_device(handle, &device);
 689                 if (ret == 0)
 690                         return device;
 691         } while (1);
 692 }
 693
 694 acpi_status
 695 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 696 {
 697         acpi_status status;
 698         acpi_handle tmp;
 699         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 700         union acpi_object *obj;
 701
 702         status = acpi_get_handle(handle, "_EJD", &tmp);
 703         if (ACPI_FAILURE(status))
 704                 return status;
 705
 706         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 707         if (ACPI_SUCCESS(status)) {
 708                 obj = buffer.pointer;
 709                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 710                                          ejd);
 711                 kfree(buffer.pointer);
 712         }
 713         return status;
 714 }
 715 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 716
 717 void acpi_bus_data_handler(acpi_handle handle, void *context)
 718 {
 719
 720         /* TBD */
 721
 722         return;
 723 }
 724
 725 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 726 {
 727         device->performance.state = ACPI_STATE_UNKNOWN;
 728         return 0;
 729 }
 730
 731 static acpi_status
 732 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 733                                              union acpi_object *package)
 734 {
 735         int i = 0;
 736         union acpi_object *element = NULL;
 737
 738         if (!device || !package || (package->package.count < 2))
 739                 return AE_BAD_PARAMETER;
 740
 741         element = &(package->package.elements[0]);
 742         if (!element)
 743                 return AE_BAD_PARAMETER;
 744         if (element->type == ACPI_TYPE_PACKAGE) {
 745                 if ((element->package.count < 2) ||
 746                     (element->package.elements[0].type !=
 747                      ACPI_TYPE_LOCAL_REFERENCE)
 748                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 749                         return AE_BAD_DATA;
 750                 device->wakeup.gpe_device =
 751                     element->package.elements[0].reference.handle;
 752                 device->wakeup.gpe_number =
 753                     (u32) element->package.elements[1].integer.value;
 754         } else if (element->type == ACPI_TYPE_INTEGER) {
 755                 device->wakeup.gpe_number = element->integer.value;
 756         } else
 757                 return AE_BAD_DATA;
 758
 759         element = &(package->package.elements[1]);
 760         if (element->type != ACPI_TYPE_INTEGER) {
 761                 return AE_BAD_DATA;
 762         }
 763         device->wakeup.sleep_state = element->integer.value;
 764
 765         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 766                 return AE_NO_MEMORY;
 767         }
 768         device->wakeup.resources.count = package->package.count - 2;
 769         for (i = 0; i < device->wakeup.resources.count; i++) {
 770                 element = &(package->package.elements[i + 2]);
 771                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 772                         return AE_BAD_DATA;
 773
 774                 device->wakeup.resources.handles[i] = element->reference.handle;
 775         }
 776
 777         return AE_OK;
 778 }
 779
 780 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 781 {
 782         acpi_status status = 0;
 783         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 784         union acpi_object *package = NULL;
 785         int psw_error;
 786
 787         struct acpi_device_id button_device_ids[] = {
 788                 {"PNP0C0D", 0},
 789                 {"PNP0C0C", 0},
 790                 {"PNP0C0E", 0},
 791                 {"", 0},
 792         };
 793
 794         /* _PRW */
 795         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 796         if (ACPI_FAILURE(status)) {
 797                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 798                 goto end;
 799         }
 800
 801         package = (union acpi_object *)buffer.pointer;
 802         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 803         if (ACPI_FAILURE(status)) {
 804                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 805                 goto end;
 806         }
 807
 808         kfree(buffer.pointer);
 809
 810         device->wakeup.flags.valid = 1;
 811         device->wakeup.prepare_count = 0;
 812         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 813          * system for the ACPI device with the _PRW object.
 814          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 815          * So it is necessary to call _DSW object first. Only when it is not
 816          * present will the _PSW object used.
 817          */
 818         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 819         if (psw_error)
 820                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 821                                 "error in _DSW or _PSW evaluation\n"));
 822
 823         /* Power button, Lid switch always enable wakeup */
 824         if (!acpi_match_device_ids(device, button_device_ids))
 825                 device->wakeup.flags.run_wake = 1;
 826
 827 end:
 828         if (ACPI_FAILURE(status))
 829                 device->flags.wake_capable = 0;
 830         return 0;
 831 }
 832
 833 static int acpi_bus_get_power_flags(struct acpi_device *device)
 834 {
 835         acpi_status status = 0;
 836         acpi_handle handle = NULL;
 837         u32 i = 0;
 838
 839
 840         /*
 841          * Power Management Flags
 842          */
 843         status = acpi_get_handle(device->handle, "_PSC", &handle);
 844         if (ACPI_SUCCESS(status))
 845                 device->power.flags.explicit_get = 1;
 846         status = acpi_get_handle(device->handle, "_IRC", &handle);
 847         if (ACPI_SUCCESS(status))
 848                 device->power.flags.inrush_current = 1;
 849
 850         /*
 851          * Enumerate supported power management states
 852          */
 853         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 854                 struct acpi_device_power_state *ps = &device->power.states[i];
 855                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 856
 857                 /* Evaluate "_PRx" to se if power resources are referenced */
 858                 acpi_evaluate_reference(device->handle, object_name, NULL,
 859                                         &ps->resources);
 860                 if (ps->resources.count) {
 861                         device->power.flags.power_resources = 1;
 862                         ps->flags.valid = 1;
 863                 }
 864
 865                 /* Evaluate "_PSx" to see if we can do explicit sets */
 866                 object_name[2] = 'S';
 867                 status = acpi_get_handle(device->handle, object_name, &handle);
 868                 if (ACPI_SUCCESS(status)) {
 869                         ps->flags.explicit_set = 1;
 870                         ps->flags.valid = 1;
 871                 }
 872
 873                 /* State is valid if we have some power control */
 874                 if (ps->resources.count || ps->flags.explicit_set)
 875                         ps->flags.valid = 1;
 876
 877                 ps->power = -1; /* Unknown - driver assigned */
 878                 ps->latency = -1;       /* Unknown - driver assigned */
 879         }
 880
 881         /* Set defaults for D0 and D3 states (always valid) */
 882         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 883         device->power.states[ACPI_STATE_D0].power = 100;
 884         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 885         device->power.states[ACPI_STATE_D3].power = 0;
 886
 887         /* TBD: System wake support and resource requirements. */
 888
 889         device->power.state = ACPI_STATE_UNKNOWN;
 890         acpi_bus_get_power(device->handle, &(device->power.state));
 891
 892         return 0;
 893 }
 894
 895 static int acpi_bus_get_flags(struct acpi_device *device)
 896 {
 897         acpi_status status = AE_OK;
 898         acpi_handle temp = NULL;
 899
 900
 901         /* Presence of _STA indicates 'dynamic_status' */
 902         status = acpi_get_handle(device->handle, "_STA", &temp);
 903         if (ACPI_SUCCESS(status))
 904                 device->flags.dynamic_status = 1;
 905
 906         /* Presence of _CID indicates 'compatible_ids' */
 907         status = acpi_get_handle(device->handle, "_CID", &temp);
 908         if (ACPI_SUCCESS(status))
 909                 device->flags.compatible_ids = 1;
 910
 911         /* Presence of _RMV indicates 'removable' */
 912         status = acpi_get_handle(device->handle, "_RMV", &temp);
 913         if (ACPI_SUCCESS(status))
 914                 device->flags.removable = 1;
 915
 916         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 917         status = acpi_get_handle(device->handle, "_EJD", &temp);
 918         if (ACPI_SUCCESS(status))
 919                 device->flags.ejectable = 1;
 920         else {
 921                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 922                 if (ACPI_SUCCESS(status))
 923                         device->flags.ejectable = 1;
 924         }
 925
 926         /* Presence of _LCK indicates 'lockable' */
 927         status = acpi_get_handle(device->handle, "_LCK", &temp);
 928         if (ACPI_SUCCESS(status))
 929                 device->flags.lockable = 1;
 930
 931         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 932         status = acpi_get_handle(device->handle, "_PS0", &temp);
 933         if (ACPI_FAILURE(status))
 934                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 935         if (ACPI_SUCCESS(status))
 936                 device->flags.power_manageable = 1;
 937
 938         /* Presence of _PRW indicates wake capable */
 939         status = acpi_get_handle(device->handle, "_PRW", &temp);
 940         if (ACPI_SUCCESS(status))
 941                 device->flags.wake_capable = 1;
 942
 943         /* TBD: Performance management */
 944
 945         return 0;
 946 }
 947
 948 static void acpi_device_get_busid(struct acpi_device *device)
 949 {
 950         char bus_id[5] = { '?', 0 };
 951         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 952         int i = 0;
 953
 954         /*
 955          * Bus ID
 956          * ------
 957          * The device's Bus ID is simply the object name.
 958          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 959          */
 960         if (ACPI_IS_ROOT_DEVICE(device)) {
 961                 strcpy(device->pnp.bus_id, "ACPI");
 962                 return;
 963         }
 964
 965         switch (device->device_type) {
 966         case ACPI_BUS_TYPE_POWER_BUTTON:
 967                 strcpy(device->pnp.bus_id, "PWRF");
 968                 break;
 969         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 970                 strcpy(device->pnp.bus_id, "SLPF");
 971                 break;
 972         default:
 973                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
 974                 /* Clean up trailing underscores (if any) */
 975                 for (i = 3; i > 1; i--) {
 976                         if (bus_id[i] == '_')
 977                                 bus_id[i] = '\0';
 978                         else
 979                                 break;
 980                 }
 981                 strcpy(device->pnp.bus_id, bus_id);
 982                 break;
 983         }
 984 }
 985
 986 /*
 987  * acpi_bay_match - see if a device is an ejectable driver bay
 988  *
 989  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 990  * then we can safely call it an ejectable drive bay
 991  */
 992 static int acpi_bay_match(struct acpi_device *device){
 993         acpi_status status;
 994         acpi_handle handle;
 995         acpi_handle tmp;
 996         acpi_handle phandle;
 997
 998         handle = device->handle;
 999
1000         status = acpi_get_handle(handle, "_EJ0", &tmp);
1001         if (ACPI_FAILURE(status))
1002                 return -ENODEV;
1003
1004         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1005                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1006                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1007                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1008                 return 0;
1009
1010         if (acpi_get_parent(handle, &phandle))
1011                 return -ENODEV;
1012
1013         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1014                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1015                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1016                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1017                 return 0;
1018
1019         return -ENODEV;
1020 }
1021
1022 /*
1023  * acpi_dock_match - see if a device has a _DCK method
1024  */
1025 static int acpi_dock_match(struct acpi_device *device)
1026 {
1027         acpi_handle tmp;
1028         return acpi_get_handle(device->handle, "_DCK", &tmp);
1029 }
1030
1031 static struct acpica_device_id_list*
1032 acpi_add_cid(
1033         struct acpi_device_info         *info,
1034         struct acpica_device_id         *new_cid)
1035 {
1036         struct acpica_device_id_list    *cid;
1037         char                            *next_id_string;
1038         acpi_size                       cid_length;
1039         acpi_size                       new_cid_length;
1040         u32                             i;
1041
1042
1043         /* Allocate new CID list with room for the new CID */
1044
1045         if (!new_cid)
1046                 new_cid_length = info->compatible_id_list.list_size;
1047         else if (info->compatible_id_list.list_size)
1048                 new_cid_length = info->compatible_id_list.list_size +
1049                         new_cid->length + sizeof(struct acpica_device_id);
1050         else
1051                 new_cid_length = sizeof(struct acpica_device_id_list) + new_cid->length;
1052
1053         cid = ACPI_ALLOCATE_ZEROED(new_cid_length);
1054         if (!cid) {
1055                 return NULL;
1056         }
1057
1058         cid->list_size = new_cid_length;
1059         cid->count = info->compatible_id_list.count;
1060         if (new_cid)
1061                 cid->count++;
1062         next_id_string = (char *) cid->ids + (cid->count * sizeof(struct acpica_device_id));
1063
1064         /* Copy all existing CIDs */
1065
1066         for (i = 0; i < info->compatible_id_list.count; i++) {
1067                 cid_length = info->compatible_id_list.ids[i].length;
1068                 cid->ids[i].string = next_id_string;
1069                 cid->ids[i].length = cid_length;
1070
1071                 ACPI_MEMCPY(next_id_string, info->compatible_id_list.ids[i].string,
1072                         cid_length);
1073
1074                 next_id_string += cid_length;
1075         }
1076
1077         /* Append the new CID */
1078
1079         if (new_cid) {
1080                 cid->ids[i].string = next_id_string;
1081                 cid->ids[i].length = new_cid->length;
1082
1083                 ACPI_MEMCPY(next_id_string, new_cid->string, new_cid->length);
1084         }
1085
1086         return cid;
1087 }
1088
1089 static void acpi_device_set_id(struct acpi_device *device)
1090 {
1091         struct acpi_device_info *info = NULL;
1092         char *hid = NULL;
1093         char *uid = NULL;
1094         struct acpica_device_id_list *cid_list = NULL;
1095         char *cid_add = NULL;
1096         acpi_status status;
1097
1098         switch (device->device_type) {
1099         case ACPI_BUS_TYPE_DEVICE:
1100                 if (ACPI_IS_ROOT_DEVICE(device)) {
1101                         hid = ACPI_SYSTEM_HID;
1102                         break;
1103                 }
1104
1105                 status = acpi_get_object_info(device->handle, &info);
1106                 if (ACPI_FAILURE(status)) {
1107                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1108                         return;
1109                 }
1110
1111                 if (info->valid & ACPI_VALID_HID)
1112                         hid = info->hardware_id.string;
1113                 if (info->valid & ACPI_VALID_UID)
1114                         uid = info->unique_id.string;
1115                 if (info->valid & ACPI_VALID_CID)
1116                         cid_list = &info->compatible_id_list;
1117                 if (info->valid & ACPI_VALID_ADR) {
1118                         device->pnp.bus_address = info->address;
1119                         device->flags.bus_address = 1;
1120                 }
1121
1122                 /* If we have a video/bay/dock device, add our selfdefined
1123                    HID to the CID list. Like that the video/bay/dock drivers
1124                    will get autoloaded and the device might still match
1125                    against another driver.
1126                 */
1127                 if (acpi_is_video_device(device))
1128                         cid_add = ACPI_VIDEO_HID;
1129                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1130                         cid_add = ACPI_BAY_HID;
1131                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1132                         cid_add = ACPI_DOCK_HID;
1133
1134                 break;
1135         case ACPI_BUS_TYPE_POWER:
1136                 hid = ACPI_POWER_HID;
1137                 break;
1138         case ACPI_BUS_TYPE_PROCESSOR:
1139                 hid = ACPI_PROCESSOR_OBJECT_HID;
1140                 break;
1141         case ACPI_BUS_TYPE_THERMAL:
1142                 hid = ACPI_THERMAL_HID;
1143                 break;
1144         case ACPI_BUS_TYPE_POWER_BUTTON:
1145                 hid = ACPI_BUTTON_HID_POWERF;
1146                 break;
1147         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1148                 hid = ACPI_BUTTON_HID_SLEEPF;
1149                 break;
1150         }
1151
1152         /*
1153          * \_SB
1154          * ----
1155          * Fix for the system root bus device -- the only root-level device.
1156          */
1157         if (((acpi_handle)device->parent == ACPI_ROOT_OBJECT) &&
1158              (device->device_type == ACPI_BUS_TYPE_DEVICE)) {
1159                 hid = ACPI_BUS_HID;
1160                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1161                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1162         }
1163
1164         if (hid) {
1165                 device->pnp.hardware_id = ACPI_ALLOCATE_ZEROED(strlen (hid) + 1);
1166                 if (device->pnp.hardware_id) {
1167                         strcpy(device->pnp.hardware_id, hid);
1168                         device->flags.hardware_id = 1;
1169                 }
1170         }
1171         if (!device->flags.hardware_id)
1172                 device->pnp.hardware_id = "";
1173
1174         if (uid) {
1175                 device->pnp.unique_id = ACPI_ALLOCATE_ZEROED(strlen (uid) + 1);
1176                 if (device->pnp.unique_id) {
1177                         strcpy(device->pnp.unique_id, uid);
1178                         device->flags.unique_id = 1;
1179                 }
1180         }
1181         if (!device->flags.unique_id)
1182                 device->pnp.unique_id = "";
1183
1184         if (cid_list || cid_add) {
1185                 struct acpica_device_id_list *list;
1186
1187                 if (cid_add) {
1188                         struct acpica_device_id cid;
1189                         cid.length = strlen (cid_add) + 1;
1190                         cid.string = cid_add;
1191
1192                         list = acpi_add_cid(info, &cid);
1193                 } else {
1194                         list = acpi_add_cid(info, NULL);
1195                 }
1196
1197                 if (list) {
1198                         device->pnp.cid_list = list;
1199                         if (cid_add)
1200                                 device->flags.compatible_ids = 1;
1201                 }
1202         }
1203
1204         kfree(info);
1205 }
1206
1207 static int acpi_device_set_context(struct acpi_device *device)
1208 {
1209         acpi_status status;
1210
1211         /*
1212          * Context
1213          * -------
1214          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1215          * resolutions from handle->device very efficient.  Fixed hardware
1216          * devices have no handles, so we skip them.
1217          */
1218         if (!device->handle)
1219                 return 0;
1220
1221         status = acpi_attach_data(device->handle,
1222                                   acpi_bus_data_handler, device);
1223         if (ACPI_SUCCESS(status))
1224                 return 0;
1225
1226         printk(KERN_ERR PREFIX "Error attaching device data\n");
1227         return -ENODEV;
1228 }
1229
1230 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1231 {
1232         if (!dev)
1233                 return -EINVAL;
1234
1235         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1236         device_release_driver(&dev->dev);
1237
1238         if (!rmdevice)
1239                 return 0;
1240
1241         /*
1242          * unbind _ADR-Based Devices when hot removal
1243          */
1244         if (dev->flags.bus_address) {
1245                 if ((dev->parent) && (dev->parent->ops.unbind))
1246                         dev->parent->ops.unbind(dev);
1247         }
1248         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1249
1250         return 0;
1251 }
1252
1253 static int acpi_add_single_object(struct acpi_device **child,
1254                                   acpi_handle handle, int type,
1255                                   unsigned long long sta,
1256                                   struct acpi_bus_ops *ops)
1257 {
1258         int result;
1259         struct acpi_device *device;
1260         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1261
1262         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1263         if (!device) {
1264                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1265                 return -ENOMEM;
1266         }
1267
1268         device->device_type = type;
1269         device->handle = handle;
1270         device->parent = acpi_bus_get_parent(handle);
1271         device->bus_ops = *ops; /* workround for not call .start */
1272         STRUCT_TO_INT(device->status) = sta;
1273
1274         acpi_device_get_busid(device);
1275
1276         /*
1277          * Flags
1278          * -----
1279          * Note that we only look for object handles -- cannot evaluate objects
1280          * until we know the device is present and properly initialized.
1281          */
1282         result = acpi_bus_get_flags(device);
1283         if (result)
1284                 goto end;
1285
1286         /*
1287          * Initialize Device
1288          * -----------------
1289          * TBD: Synch with Core's enumeration/initialization process.
1290          */
1291
1292         /*
1293          * Hardware ID, Unique ID, & Bus Address
1294          * -------------------------------------
1295          */
1296         acpi_device_set_id(device);
1297
1298         /*
1299          * Power Management
1300          * ----------------
1301          */
1302         if (device->flags.power_manageable) {
1303                 result = acpi_bus_get_power_flags(device);
1304                 if (result)
1305                         goto end;
1306         }
1307
1308         /*
1309          * Wakeup device management
1310          *-----------------------
1311          */
1312         if (device->flags.wake_capable) {
1313                 result = acpi_bus_get_wakeup_device_flags(device);
1314                 if (result)
1315                         goto end;
1316         }
1317
1318         /*
1319          * Performance Management
1320          * ----------------------
1321          */
1322         if (device->flags.performance_manageable) {
1323                 result = acpi_bus_get_perf_flags(device);
1324                 if (result)
1325                         goto end;
1326         }
1327
1328         if ((result = acpi_device_set_context(device)))
1329                 goto end;
1330
1331         result = acpi_device_register(device);
1332
1333         /*
1334          * Bind _ADR-Based Devices when hot add
1335          */
1336         if (device->flags.bus_address) {
1337                 if (device->parent && device->parent->ops.bind)
1338                         device->parent->ops.bind(device);
1339         }
1340
1341 end:
1342         if (!result) {
1343                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1344                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1345                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1346                          (char *) buffer.pointer,
1347                          device->parent ? dev_name(&device->parent->dev) :
1348                                           "(null)"));
1349                 kfree(buffer.pointer);
1350                 *child = device;
1351         } else
1352                 acpi_device_release(&device->dev);
1353
1354         return result;
1355 }
1356
1357 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1358                           ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
1359
1360 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1361                                     unsigned long long *sta)
1362 {
1363         acpi_status status;
1364         acpi_object_type acpi_type;
1365
1366         status = acpi_get_type(handle, &acpi_type);
1367         if (ACPI_FAILURE(status))
1368                 return -ENODEV;
1369
1370         switch (acpi_type) {
1371         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1372         case ACPI_TYPE_DEVICE:
1373                 *type = ACPI_BUS_TYPE_DEVICE;
1374                 status = acpi_bus_get_status_handle(handle, sta);
1375                 if (ACPI_FAILURE(status))
1376                         return -ENODEV;
1377                 break;
1378         case ACPI_TYPE_PROCESSOR:
1379                 *type = ACPI_BUS_TYPE_PROCESSOR;
1380                 status = acpi_bus_get_status_handle(handle, sta);
1381                 if (ACPI_FAILURE(status))
1382                         return -ENODEV;
1383                 break;
1384         case ACPI_TYPE_THERMAL:
1385                 *type = ACPI_BUS_TYPE_THERMAL;
1386                 *sta = ACPI_STA_DEFAULT;
1387                 break;
1388         case ACPI_TYPE_POWER:
1389                 *type = ACPI_BUS_TYPE_POWER;
1390                 *sta = ACPI_STA_DEFAULT;
1391                 break;
1392         default:
1393                 return -ENODEV;
1394         }
1395
1396         return 0;
1397 }
1398
1399 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1400                                       void *context, void **return_value)
1401 {
1402         struct acpi_bus_ops *ops = context;
1403         int type;
1404         unsigned long long sta;
1405         struct acpi_device *device;
1406         acpi_status status;
1407         int result;
1408
1409         result = acpi_bus_type_and_status(handle, &type, &sta);
1410         if (result)
1411                 return AE_OK;
1412
1413         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1414             !(sta & ACPI_STA_DEVICE_FUNCTIONING))
1415                 return AE_CTRL_DEPTH;
1416
1417         /*
1418          * We may already have an acpi_device from a previous enumeration.  If
1419          * so, we needn't add it again, but we may still have to start it.
1420          */
1421         device = NULL;
1422         acpi_bus_get_device(handle, &device);
1423         if (ops->acpi_op_add && !device)
1424                 acpi_add_single_object(&device, handle, type, sta, ops);
1425
1426         if (!device)
1427                 return AE_CTRL_DEPTH;
1428
1429         if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1430                 status = acpi_start_single_object(device);
1431                 if (ACPI_FAILURE(status))
1432                         return AE_CTRL_DEPTH;
1433         }
1434
1435         if (!*return_value)
1436                 *return_value = device;
1437         return AE_OK;
1438 }
1439
1440 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1441                          struct acpi_device **child)
1442 {
1443         acpi_status status;
1444         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1445         void *device = NULL;
1446
1447         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1448         printk(KERN_INFO PREFIX "Enumerating devices from [%s]\n",
1449                (char *) buffer.pointer);
1450
1451         status = acpi_bus_check_add(handle, 0, ops, &device);
1452         if (ACPI_SUCCESS(status))
1453                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1454                                     acpi_bus_check_add, ops, &device);
1455
1456         if (child)
1457                 *child = device;
1458         return 0;
1459 }
1460
1461 int
1462 acpi_bus_add(struct acpi_device **child,
1463              struct acpi_device *parent, acpi_handle handle, int type)
1464 {
1465         struct acpi_bus_ops ops;
1466
1467         memset(&ops, 0, sizeof(ops));
1468         ops.acpi_op_add = 1;
1469
1470         acpi_bus_scan(handle, &ops, child);
1471         return 0;
1472 }
1473 EXPORT_SYMBOL(acpi_bus_add);
1474
1475 int acpi_bus_start(struct acpi_device *device)
1476 {
1477         struct acpi_bus_ops ops;
1478
1479         memset(&ops, 0, sizeof(ops));
1480         ops.acpi_op_start = 1;
1481
1482         acpi_bus_scan(device->handle, &ops, NULL);
1483         return 0;
1484 }
1485 EXPORT_SYMBOL(acpi_bus_start);
1486
1487 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1488 {
1489         acpi_status status;
1490         struct acpi_device *parent, *child;
1491         acpi_handle phandle, chandle;
1492         acpi_object_type type;
1493         u32 level = 1;
1494         int err = 0;
1495
1496         parent = start;
1497         phandle = start->handle;
1498         child = chandle = NULL;
1499
1500         while ((level > 0) && parent && (!err)) {
1501                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1502                                               chandle, &chandle);
1503
1504                 /*
1505                  * If this scope is exhausted then move our way back up.
1506                  */
1507                 if (ACPI_FAILURE(status)) {
1508                         level--;
1509                         chandle = phandle;
1510                         acpi_get_parent(phandle, &phandle);
1511                         child = parent;
1512                         parent = parent->parent;
1513
1514                         if (level == 0)
1515                                 err = acpi_bus_remove(child, rmdevice);
1516                         else
1517                                 err = acpi_bus_remove(child, 1);
1518
1519                         continue;
1520                 }
1521
1522                 status = acpi_get_type(chandle, &type);
1523                 if (ACPI_FAILURE(status)) {
1524                         continue;
1525                 }
1526                 /*
1527                  * If there is a device corresponding to chandle then
1528                  * parse it (depth-first).
1529                  */
1530                 if (acpi_bus_get_device(chandle, &child) == 0) {
1531                         level++;
1532                         phandle = chandle;
1533                         chandle = NULL;
1534                         parent = child;
1535                 }
1536                 continue;
1537         }
1538         return err;
1539 }
1540 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1541
1542 static int acpi_bus_scan_fixed(void)
1543 {
1544         int result = 0;
1545         struct acpi_device *device = NULL;
1546         struct acpi_bus_ops ops;
1547
1548         memset(&ops, 0, sizeof(ops));
1549         ops.acpi_op_add = 1;
1550         ops.acpi_op_start = 1;
1551
1552         /*
1553          * Enumerate all fixed-feature devices.
1554          */
1555         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1556                 result = acpi_add_single_object(&device, NULL,
1557                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1558                                                 ACPI_STA_DEFAULT,
1559                                                 &ops);
1560         }
1561
1562         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1563                 result = acpi_add_single_object(&device, NULL,
1564                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1565                                                 ACPI_STA_DEFAULT,
1566                                                 &ops);
1567         }
1568
1569         return result;
1570 }
1571
1572 int __init acpi_scan_init(void)
1573 {
1574         int result;
1575         struct acpi_bus_ops ops;
1576
1577         memset(&ops, 0, sizeof(ops));
1578         ops.acpi_op_add = 1;
1579         ops.acpi_op_start = 1;
1580
1581         result = bus_register(&acpi_bus_type);
1582         if (result) {
1583                 /* We don't want to quit even if we failed to add suspend/resume */
1584                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1585         }
1586
1587         /*
1588          * Enumerate devices in the ACPI namespace.
1589          */
1590         result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1591
1592         if (!result)
1593                 result = acpi_bus_scan_fixed();
1594
1595         if (result)
1596                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1597
1598         return result;
1599 }