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         char *hid;
 382
 383         hid = acpi_device_hid(device);
 384         if (!strcmp(hid, ACPI_BUTTON_HID_POWERF))
 385                 status =
 386                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 387                                                      acpi_device_notify_fixed,
 388                                                      device);
 389         else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEPF))
 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 (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF))
 408                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 409                                                 acpi_device_notify_fixed);
 410         else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF))
 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 acpi_status
 668 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 669 {
 670         acpi_status status;
 671         acpi_handle tmp;
 672         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 673         union acpi_object *obj;
 674
 675         status = acpi_get_handle(handle, "_EJD", &tmp);
 676         if (ACPI_FAILURE(status))
 677                 return status;
 678
 679         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 680         if (ACPI_SUCCESS(status)) {
 681                 obj = buffer.pointer;
 682                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 683                                          ejd);
 684                 kfree(buffer.pointer);
 685         }
 686         return status;
 687 }
 688 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 689
 690 void acpi_bus_data_handler(acpi_handle handle, void *context)
 691 {
 692
 693         /* TBD */
 694
 695         return;
 696 }
 697
 698 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 699 {
 700         device->performance.state = ACPI_STATE_UNKNOWN;
 701         return 0;
 702 }
 703
 704 static acpi_status
 705 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 706                                              union acpi_object *package)
 707 {
 708         int i = 0;
 709         union acpi_object *element = NULL;
 710
 711         if (!device || !package || (package->package.count < 2))
 712                 return AE_BAD_PARAMETER;
 713
 714         element = &(package->package.elements[0]);
 715         if (!element)
 716                 return AE_BAD_PARAMETER;
 717         if (element->type == ACPI_TYPE_PACKAGE) {
 718                 if ((element->package.count < 2) ||
 719                     (element->package.elements[0].type !=
 720                      ACPI_TYPE_LOCAL_REFERENCE)
 721                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 722                         return AE_BAD_DATA;
 723                 device->wakeup.gpe_device =
 724                     element->package.elements[0].reference.handle;
 725                 device->wakeup.gpe_number =
 726                     (u32) element->package.elements[1].integer.value;
 727         } else if (element->type == ACPI_TYPE_INTEGER) {
 728                 device->wakeup.gpe_number = element->integer.value;
 729         } else
 730                 return AE_BAD_DATA;
 731
 732         element = &(package->package.elements[1]);
 733         if (element->type != ACPI_TYPE_INTEGER) {
 734                 return AE_BAD_DATA;
 735         }
 736         device->wakeup.sleep_state = element->integer.value;
 737
 738         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 739                 return AE_NO_MEMORY;
 740         }
 741         device->wakeup.resources.count = package->package.count - 2;
 742         for (i = 0; i < device->wakeup.resources.count; i++) {
 743                 element = &(package->package.elements[i + 2]);
 744                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 745                         return AE_BAD_DATA;
 746
 747                 device->wakeup.resources.handles[i] = element->reference.handle;
 748         }
 749
 750         return AE_OK;
 751 }
 752
 753 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 754 {
 755         acpi_status status = 0;
 756         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 757         union acpi_object *package = NULL;
 758         int psw_error;
 759
 760         struct acpi_device_id button_device_ids[] = {
 761                 {"PNP0C0D", 0},
 762                 {"PNP0C0C", 0},
 763                 {"PNP0C0E", 0},
 764                 {"", 0},
 765         };
 766
 767         /* _PRW */
 768         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 769         if (ACPI_FAILURE(status)) {
 770                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 771                 goto end;
 772         }
 773
 774         package = (union acpi_object *)buffer.pointer;
 775         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 776         if (ACPI_FAILURE(status)) {
 777                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 778                 goto end;
 779         }
 780
 781         kfree(buffer.pointer);
 782
 783         device->wakeup.flags.valid = 1;
 784         device->wakeup.prepare_count = 0;
 785         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 786          * system for the ACPI device with the _PRW object.
 787          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 788          * So it is necessary to call _DSW object first. Only when it is not
 789          * present will the _PSW object used.
 790          */
 791         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 792         if (psw_error)
 793                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 794                                 "error in _DSW or _PSW evaluation\n"));
 795
 796         /* Power button, Lid switch always enable wakeup */
 797         if (!acpi_match_device_ids(device, button_device_ids))
 798                 device->wakeup.flags.run_wake = 1;
 799
 800 end:
 801         if (ACPI_FAILURE(status))
 802                 device->flags.wake_capable = 0;
 803         return 0;
 804 }
 805
 806 static int acpi_bus_get_power_flags(struct acpi_device *device)
 807 {
 808         acpi_status status = 0;
 809         acpi_handle handle = NULL;
 810         u32 i = 0;
 811
 812
 813         /*
 814          * Power Management Flags
 815          */
 816         status = acpi_get_handle(device->handle, "_PSC", &handle);
 817         if (ACPI_SUCCESS(status))
 818                 device->power.flags.explicit_get = 1;
 819         status = acpi_get_handle(device->handle, "_IRC", &handle);
 820         if (ACPI_SUCCESS(status))
 821                 device->power.flags.inrush_current = 1;
 822
 823         /*
 824          * Enumerate supported power management states
 825          */
 826         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 827                 struct acpi_device_power_state *ps = &device->power.states[i];
 828                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 829
 830                 /* Evaluate "_PRx" to se if power resources are referenced */
 831                 acpi_evaluate_reference(device->handle, object_name, NULL,
 832                                         &ps->resources);
 833                 if (ps->resources.count) {
 834                         device->power.flags.power_resources = 1;
 835                         ps->flags.valid = 1;
 836                 }
 837
 838                 /* Evaluate "_PSx" to see if we can do explicit sets */
 839                 object_name[2] = 'S';
 840                 status = acpi_get_handle(device->handle, object_name, &handle);
 841                 if (ACPI_SUCCESS(status)) {
 842                         ps->flags.explicit_set = 1;
 843                         ps->flags.valid = 1;
 844                 }
 845
 846                 /* State is valid if we have some power control */
 847                 if (ps->resources.count || ps->flags.explicit_set)
 848                         ps->flags.valid = 1;
 849
 850                 ps->power = -1; /* Unknown - driver assigned */
 851                 ps->latency = -1;       /* Unknown - driver assigned */
 852         }
 853
 854         /* Set defaults for D0 and D3 states (always valid) */
 855         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 856         device->power.states[ACPI_STATE_D0].power = 100;
 857         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 858         device->power.states[ACPI_STATE_D3].power = 0;
 859
 860         /* TBD: System wake support and resource requirements. */
 861
 862         device->power.state = ACPI_STATE_UNKNOWN;
 863         acpi_bus_get_power(device->handle, &(device->power.state));
 864
 865         return 0;
 866 }
 867
 868 static int acpi_bus_get_flags(struct acpi_device *device)
 869 {
 870         acpi_status status = AE_OK;
 871         acpi_handle temp = NULL;
 872
 873
 874         /* Presence of _STA indicates 'dynamic_status' */
 875         status = acpi_get_handle(device->handle, "_STA", &temp);
 876         if (ACPI_SUCCESS(status))
 877                 device->flags.dynamic_status = 1;
 878
 879         /* Presence of _CID indicates 'compatible_ids' */
 880         status = acpi_get_handle(device->handle, "_CID", &temp);
 881         if (ACPI_SUCCESS(status))
 882                 device->flags.compatible_ids = 1;
 883
 884         /* Presence of _RMV indicates 'removable' */
 885         status = acpi_get_handle(device->handle, "_RMV", &temp);
 886         if (ACPI_SUCCESS(status))
 887                 device->flags.removable = 1;
 888
 889         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 890         status = acpi_get_handle(device->handle, "_EJD", &temp);
 891         if (ACPI_SUCCESS(status))
 892                 device->flags.ejectable = 1;
 893         else {
 894                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 895                 if (ACPI_SUCCESS(status))
 896                         device->flags.ejectable = 1;
 897         }
 898
 899         /* Presence of _LCK indicates 'lockable' */
 900         status = acpi_get_handle(device->handle, "_LCK", &temp);
 901         if (ACPI_SUCCESS(status))
 902                 device->flags.lockable = 1;
 903
 904         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 905         status = acpi_get_handle(device->handle, "_PS0", &temp);
 906         if (ACPI_FAILURE(status))
 907                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 908         if (ACPI_SUCCESS(status))
 909                 device->flags.power_manageable = 1;
 910
 911         /* Presence of _PRW indicates wake capable */
 912         status = acpi_get_handle(device->handle, "_PRW", &temp);
 913         if (ACPI_SUCCESS(status))
 914                 device->flags.wake_capable = 1;
 915
 916         /* TBD: Performance management */
 917
 918         return 0;
 919 }
 920
 921 static void acpi_device_get_busid(struct acpi_device *device, int type)
 922 {
 923         char bus_id[5] = { '?', 0 };
 924         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 925         int i = 0;
 926
 927         /*
 928          * Bus ID
 929          * ------
 930          * The device's Bus ID is simply the object name.
 931          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 932          */
 933         switch (type) {
 934         case ACPI_BUS_TYPE_SYSTEM:
 935                 strcpy(device->pnp.bus_id, "ACPI");
 936                 break;
 937         case ACPI_BUS_TYPE_POWER_BUTTON:
 938                 strcpy(device->pnp.bus_id, "PWRF");
 939                 break;
 940         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 941                 strcpy(device->pnp.bus_id, "SLPF");
 942                 break;
 943         default:
 944                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
 945                 /* Clean up trailing underscores (if any) */
 946                 for (i = 3; i > 1; i--) {
 947                         if (bus_id[i] == '_')
 948                                 bus_id[i] = '\0';
 949                         else
 950                                 break;
 951                 }
 952                 strcpy(device->pnp.bus_id, bus_id);
 953                 break;
 954         }
 955 }
 956
 957 /*
 958  * acpi_bay_match - see if a device is an ejectable driver bay
 959  *
 960  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 961  * then we can safely call it an ejectable drive bay
 962  */
 963 static int acpi_bay_match(struct acpi_device *device){
 964         acpi_status status;
 965         acpi_handle handle;
 966         acpi_handle tmp;
 967         acpi_handle phandle;
 968
 969         handle = device->handle;
 970
 971         status = acpi_get_handle(handle, "_EJ0", &tmp);
 972         if (ACPI_FAILURE(status))
 973                 return -ENODEV;
 974
 975         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 976                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 977                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 978                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 979                 return 0;
 980
 981         if (acpi_get_parent(handle, &phandle))
 982                 return -ENODEV;
 983
 984         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 985                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 986                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 987                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 988                 return 0;
 989
 990         return -ENODEV;
 991 }
 992
 993 /*
 994  * acpi_dock_match - see if a device has a _DCK method
 995  */
 996 static int acpi_dock_match(struct acpi_device *device)
 997 {
 998         acpi_handle tmp;
 999         return acpi_get_handle(device->handle, "_DCK", &tmp);
1000 }
1001
1002 static struct acpica_device_id_list*
1003 acpi_add_cid(
1004         struct acpi_device_info         *info,
1005         struct acpica_device_id         *new_cid)
1006 {
1007         struct acpica_device_id_list    *cid;
1008         char                            *next_id_string;
1009         acpi_size                       cid_length;
1010         acpi_size                       new_cid_length;
1011         u32                             i;
1012
1013
1014         /* Allocate new CID list with room for the new CID */
1015
1016         if (!new_cid)
1017                 new_cid_length = info->compatible_id_list.list_size;
1018         else if (info->compatible_id_list.list_size)
1019                 new_cid_length = info->compatible_id_list.list_size +
1020                         new_cid->length + sizeof(struct acpica_device_id);
1021         else
1022                 new_cid_length = sizeof(struct acpica_device_id_list) + new_cid->length;
1023
1024         cid = ACPI_ALLOCATE_ZEROED(new_cid_length);
1025         if (!cid) {
1026                 return NULL;
1027         }
1028
1029         cid->list_size = new_cid_length;
1030         cid->count = info->compatible_id_list.count;
1031         if (new_cid)
1032                 cid->count++;
1033         next_id_string = (char *) cid->ids + (cid->count * sizeof(struct acpica_device_id));
1034
1035         /* Copy all existing CIDs */
1036
1037         for (i = 0; i < info->compatible_id_list.count; i++) {
1038                 cid_length = info->compatible_id_list.ids[i].length;
1039                 cid->ids[i].string = next_id_string;
1040                 cid->ids[i].length = cid_length;
1041
1042                 ACPI_MEMCPY(next_id_string, info->compatible_id_list.ids[i].string,
1043                         cid_length);
1044
1045                 next_id_string += cid_length;
1046         }
1047
1048         /* Append the new CID */
1049
1050         if (new_cid) {
1051                 cid->ids[i].string = next_id_string;
1052                 cid->ids[i].length = new_cid->length;
1053
1054                 ACPI_MEMCPY(next_id_string, new_cid->string, new_cid->length);
1055         }
1056
1057         return cid;
1058 }
1059
1060 static void acpi_device_set_id(struct acpi_device *device, int type)
1061 {
1062         struct acpi_device_info *info = NULL;
1063         char *hid = NULL;
1064         char *uid = NULL;
1065         struct acpica_device_id_list *cid_list = NULL;
1066         char *cid_add = NULL;
1067         acpi_status status;
1068
1069         switch (type) {
1070         case ACPI_BUS_TYPE_DEVICE:
1071                 status = acpi_get_object_info(device->handle, &info);
1072                 if (ACPI_FAILURE(status)) {
1073                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1074                         return;
1075                 }
1076
1077                 if (info->valid & ACPI_VALID_HID)
1078                         hid = info->hardware_id.string;
1079                 if (info->valid & ACPI_VALID_UID)
1080                         uid = info->unique_id.string;
1081                 if (info->valid & ACPI_VALID_CID)
1082                         cid_list = &info->compatible_id_list;
1083                 if (info->valid & ACPI_VALID_ADR) {
1084                         device->pnp.bus_address = info->address;
1085                         device->flags.bus_address = 1;
1086                 }
1087
1088                 /* If we have a video/bay/dock device, add our selfdefined
1089                    HID to the CID list. Like that the video/bay/dock drivers
1090                    will get autoloaded and the device might still match
1091                    against another driver.
1092                 */
1093                 if (acpi_is_video_device(device))
1094                         cid_add = ACPI_VIDEO_HID;
1095                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1096                         cid_add = ACPI_BAY_HID;
1097                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1098                         cid_add = ACPI_DOCK_HID;
1099
1100                 break;
1101         case ACPI_BUS_TYPE_POWER:
1102                 hid = ACPI_POWER_HID;
1103                 break;
1104         case ACPI_BUS_TYPE_PROCESSOR:
1105                 hid = ACPI_PROCESSOR_OBJECT_HID;
1106                 break;
1107         case ACPI_BUS_TYPE_SYSTEM:
1108                 hid = ACPI_SYSTEM_HID;
1109                 break;
1110         case ACPI_BUS_TYPE_THERMAL:
1111                 hid = ACPI_THERMAL_HID;
1112                 break;
1113         case ACPI_BUS_TYPE_POWER_BUTTON:
1114                 hid = ACPI_BUTTON_HID_POWERF;
1115                 break;
1116         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1117                 hid = ACPI_BUTTON_HID_SLEEPF;
1118                 break;
1119         }
1120
1121         /*
1122          * \_SB
1123          * ----
1124          * Fix for the system root bus device -- the only root-level device.
1125          */
1126         if (((acpi_handle)device->parent == ACPI_ROOT_OBJECT) &&
1127              (type == ACPI_BUS_TYPE_DEVICE)) {
1128                 hid = ACPI_BUS_HID;
1129                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1130                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1131         }
1132
1133         if (hid) {
1134                 device->pnp.hardware_id = ACPI_ALLOCATE_ZEROED(strlen (hid) + 1);
1135                 if (device->pnp.hardware_id) {
1136                         strcpy(device->pnp.hardware_id, hid);
1137                         device->flags.hardware_id = 1;
1138                 }
1139         }
1140         if (!device->flags.hardware_id)
1141                 device->pnp.hardware_id = "";
1142
1143         if (uid) {
1144                 device->pnp.unique_id = ACPI_ALLOCATE_ZEROED(strlen (uid) + 1);
1145                 if (device->pnp.unique_id) {
1146                         strcpy(device->pnp.unique_id, uid);
1147                         device->flags.unique_id = 1;
1148                 }
1149         }
1150         if (!device->flags.unique_id)
1151                 device->pnp.unique_id = "";
1152
1153         if (cid_list || cid_add) {
1154                 struct acpica_device_id_list *list;
1155
1156                 if (cid_add) {
1157                         struct acpica_device_id cid;
1158                         cid.length = strlen (cid_add) + 1;
1159                         cid.string = cid_add;
1160
1161                         list = acpi_add_cid(info, &cid);
1162                 } else {
1163                         list = acpi_add_cid(info, NULL);
1164                 }
1165
1166                 if (list) {
1167                         device->pnp.cid_list = list;
1168                         if (cid_add)
1169                                 device->flags.compatible_ids = 1;
1170                 }
1171         }
1172
1173         kfree(info);
1174 }
1175
1176 static int acpi_device_set_context(struct acpi_device *device, int type)
1177 {
1178         acpi_status status = AE_OK;
1179         int result = 0;
1180         /*
1181          * Context
1182          * -------
1183          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1184          * resolutions from handle->device very efficient.  Note that we need
1185          * to be careful with fixed-feature devices as they all attach to the
1186          * root object.
1187          */
1188         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1189             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1190                 status = acpi_attach_data(device->handle,
1191                                           acpi_bus_data_handler, device);
1192
1193                 if (ACPI_FAILURE(status)) {
1194                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1195                         result = -ENODEV;
1196                 }
1197         }
1198         return result;
1199 }
1200
1201 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1202 {
1203         if (!dev)
1204                 return -EINVAL;
1205
1206         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1207         device_release_driver(&dev->dev);
1208
1209         if (!rmdevice)
1210                 return 0;
1211
1212         /*
1213          * unbind _ADR-Based Devices when hot removal
1214          */
1215         if (dev->flags.bus_address) {
1216                 if ((dev->parent) && (dev->parent->ops.unbind))
1217                         dev->parent->ops.unbind(dev);
1218         }
1219         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1220
1221         return 0;
1222 }
1223
1224 static int
1225 acpi_add_single_object(struct acpi_device **child,
1226                        struct acpi_device *parent, acpi_handle handle, int type,
1227                         struct acpi_bus_ops *ops)
1228 {
1229         int result = 0;
1230         struct acpi_device *device = NULL;
1231         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1232
1233
1234         if (!child)
1235                 return -EINVAL;
1236
1237         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1238         if (!device) {
1239                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1240                 return -ENOMEM;
1241         }
1242
1243         device->device_type = type;
1244         device->handle = handle;
1245         device->parent = parent;
1246         device->bus_ops = *ops; /* workround for not call .start */
1247
1248         acpi_device_get_busid(device, type);
1249
1250         /*
1251          * Flags
1252          * -----
1253          * Get prior to calling acpi_bus_get_status() so we know whether
1254          * or not _STA is present.  Note that we only look for object
1255          * handles -- cannot evaluate objects until we know the device is
1256          * present and properly initialized.
1257          */
1258         result = acpi_bus_get_flags(device);
1259         if (result)
1260                 goto end;
1261
1262         /*
1263          * Status
1264          * ------
1265          * See if the device is present.  We always assume that non-Device
1266          * and non-Processor objects (e.g. thermal zones, power resources,
1267          * etc.) are present, functioning, etc. (at least when parent object
1268          * is present).  Note that _STA has a different meaning for some
1269          * objects (e.g. power resources) so we need to be careful how we use
1270          * it.
1271          */
1272         switch (type) {
1273         case ACPI_BUS_TYPE_PROCESSOR:
1274         case ACPI_BUS_TYPE_DEVICE:
1275                 result = acpi_bus_get_status(device);
1276                 if (ACPI_FAILURE(result)) {
1277                         result = -ENODEV;
1278                         goto end;
1279                 }
1280                 /*
1281                  * When the device is neither present nor functional, the
1282                  * device should not be added to Linux ACPI device tree.
1283                  * When the status of the device is not present but functinal,
1284                  * it should be added to Linux ACPI tree. For example : bay
1285                  * device , dock device.
1286                  * In such conditions it is unncessary to check whether it is
1287                  * bay device or dock device.
1288                  */
1289                 if (!device->status.present && !device->status.functional) {
1290                         result = -ENODEV;
1291                         goto end;
1292                 }
1293                 break;
1294         default:
1295                 STRUCT_TO_INT(device->status) =
1296                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1297                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1298                 break;
1299         }
1300
1301         /*
1302          * Initialize Device
1303          * -----------------
1304          * TBD: Synch with Core's enumeration/initialization process.
1305          */
1306
1307         /*
1308          * Hardware ID, Unique ID, & Bus Address
1309          * -------------------------------------
1310          */
1311         acpi_device_set_id(device, type);
1312
1313         /*
1314          * Power Management
1315          * ----------------
1316          */
1317         if (device->flags.power_manageable) {
1318                 result = acpi_bus_get_power_flags(device);
1319                 if (result)
1320                         goto end;
1321         }
1322
1323         /*
1324          * Wakeup device management
1325          *-----------------------
1326          */
1327         if (device->flags.wake_capable) {
1328                 result = acpi_bus_get_wakeup_device_flags(device);
1329                 if (result)
1330                         goto end;
1331         }
1332
1333         /*
1334          * Performance Management
1335          * ----------------------
1336          */
1337         if (device->flags.performance_manageable) {
1338                 result = acpi_bus_get_perf_flags(device);
1339                 if (result)
1340                         goto end;
1341         }
1342
1343         if ((result = acpi_device_set_context(device, type)))
1344                 goto end;
1345
1346         result = acpi_device_register(device);
1347
1348         /*
1349          * Bind _ADR-Based Devices when hot add
1350          */
1351         if (device->flags.bus_address) {
1352                 if (device->parent && device->parent->ops.bind)
1353                         device->parent->ops.bind(device);
1354         }
1355
1356 end:
1357         if (!result) {
1358                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1359                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1360                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1361                          (char *) buffer.pointer,
1362                          device->parent ? dev_name(&device->parent->dev) :
1363                                           "(null)"));
1364                 kfree(buffer.pointer);
1365                 *child = device;
1366         } else
1367                 acpi_device_release(&device->dev);
1368
1369         return result;
1370 }
1371
1372 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1373 {
1374         acpi_status status = AE_OK;
1375         struct acpi_device *parent = NULL;
1376         struct acpi_device *child = NULL;
1377         acpi_handle phandle = NULL;
1378         acpi_handle chandle = NULL;
1379         acpi_object_type type = 0;
1380         u32 level = 1;
1381
1382
1383         if (!start)
1384                 return -EINVAL;
1385
1386         parent = start;
1387         phandle = start->handle;
1388
1389         /*
1390          * Parse through the ACPI namespace, identify all 'devices', and
1391          * create a new 'struct acpi_device' for each.
1392          */
1393         while ((level > 0) && parent) {
1394
1395                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1396                                               chandle, &chandle);
1397
1398                 /*
1399                  * If this scope is exhausted then move our way back up.
1400                  */
1401                 if (ACPI_FAILURE(status)) {
1402                         level--;
1403                         chandle = phandle;
1404                         acpi_get_parent(phandle, &phandle);
1405                         if (parent->parent)
1406                                 parent = parent->parent;
1407                         continue;
1408                 }
1409
1410                 status = acpi_get_type(chandle, &type);
1411                 if (ACPI_FAILURE(status))
1412                         continue;
1413
1414                 /*
1415                  * If this is a scope object then parse it (depth-first).
1416                  */
1417                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1418                         level++;
1419                         phandle = chandle;
1420                         chandle = NULL;
1421                         continue;
1422                 }
1423
1424                 /*
1425                  * We're only interested in objects that we consider 'devices'.
1426                  */
1427                 switch (type) {
1428                 case ACPI_TYPE_DEVICE:
1429                         type = ACPI_BUS_TYPE_DEVICE;
1430                         break;
1431                 case ACPI_TYPE_PROCESSOR:
1432                         type = ACPI_BUS_TYPE_PROCESSOR;
1433                         break;
1434                 case ACPI_TYPE_THERMAL:
1435                         type = ACPI_BUS_TYPE_THERMAL;
1436                         break;
1437                 case ACPI_TYPE_POWER:
1438                         type = ACPI_BUS_TYPE_POWER;
1439                         break;
1440                 default:
1441                         continue;
1442                 }
1443
1444                 if (ops->acpi_op_add)
1445                         status = acpi_add_single_object(&child, parent,
1446                                 chandle, type, ops);
1447                 else
1448                         status = acpi_bus_get_device(chandle, &child);
1449
1450                 if (ACPI_FAILURE(status))
1451                         continue;
1452
1453                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1454                         status = acpi_start_single_object(child);
1455                         if (ACPI_FAILURE(status))
1456                                 continue;
1457                 }
1458
1459                 /*
1460                  * If the device is present, enabled, and functioning then
1461                  * parse its scope (depth-first).  Note that we need to
1462                  * represent absent devices to facilitate PnP notifications
1463                  * -- but only the subtree head (not all of its children,
1464                  * which will be enumerated when the parent is inserted).
1465                  *
1466                  * TBD: Need notifications and other detection mechanisms
1467                  *      in place before we can fully implement this.
1468                  */
1469                  /*
1470                  * When the device is not present but functional, it is also
1471                  * necessary to scan the children of this device.
1472                  */
1473                 if (child->status.present || (!child->status.present &&
1474                                         child->status.functional)) {
1475                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1476                                                       NULL, NULL);
1477                         if (ACPI_SUCCESS(status)) {
1478                                 level++;
1479                                 phandle = chandle;
1480                                 chandle = NULL;
1481                                 parent = child;
1482                         }
1483                 }
1484         }
1485
1486         return 0;
1487 }
1488
1489 int
1490 acpi_bus_add(struct acpi_device **child,
1491              struct acpi_device *parent, acpi_handle handle, int type)
1492 {
1493         int result;
1494         struct acpi_bus_ops ops;
1495
1496         memset(&ops, 0, sizeof(ops));
1497         ops.acpi_op_add = 1;
1498
1499         result = acpi_add_single_object(child, parent, handle, type, &ops);
1500         if (!result)
1501                 result = acpi_bus_scan(*child, &ops);
1502
1503         return result;
1504 }
1505 EXPORT_SYMBOL(acpi_bus_add);
1506
1507 int acpi_bus_start(struct acpi_device *device)
1508 {
1509         int result;
1510         struct acpi_bus_ops ops;
1511
1512
1513         if (!device)
1514                 return -EINVAL;
1515
1516         result = acpi_start_single_object(device);
1517         if (!result) {
1518                 memset(&ops, 0, sizeof(ops));
1519                 ops.acpi_op_start = 1;
1520                 result = acpi_bus_scan(device, &ops);
1521         }
1522         return result;
1523 }
1524 EXPORT_SYMBOL(acpi_bus_start);
1525
1526 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1527 {
1528         acpi_status status;
1529         struct acpi_device *parent, *child;
1530         acpi_handle phandle, chandle;
1531         acpi_object_type type;
1532         u32 level = 1;
1533         int err = 0;
1534
1535         parent = start;
1536         phandle = start->handle;
1537         child = chandle = NULL;
1538
1539         while ((level > 0) && parent && (!err)) {
1540                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1541                                               chandle, &chandle);
1542
1543                 /*
1544                  * If this scope is exhausted then move our way back up.
1545                  */
1546                 if (ACPI_FAILURE(status)) {
1547                         level--;
1548                         chandle = phandle;
1549                         acpi_get_parent(phandle, &phandle);
1550                         child = parent;
1551                         parent = parent->parent;
1552
1553                         if (level == 0)
1554                                 err = acpi_bus_remove(child, rmdevice);
1555                         else
1556                                 err = acpi_bus_remove(child, 1);
1557
1558                         continue;
1559                 }
1560
1561                 status = acpi_get_type(chandle, &type);
1562                 if (ACPI_FAILURE(status)) {
1563                         continue;
1564                 }
1565                 /*
1566                  * If there is a device corresponding to chandle then
1567                  * parse it (depth-first).
1568                  */
1569                 if (acpi_bus_get_device(chandle, &child) == 0) {
1570                         level++;
1571                         phandle = chandle;
1572                         chandle = NULL;
1573                         parent = child;
1574                 }
1575                 continue;
1576         }
1577         return err;
1578 }
1579 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1580
1581 static int acpi_bus_scan_fixed(void)
1582 {
1583         int result = 0;
1584         struct acpi_device *device = NULL;
1585         struct acpi_bus_ops ops;
1586
1587         memset(&ops, 0, sizeof(ops));
1588         ops.acpi_op_add = 1;
1589         ops.acpi_op_start = 1;
1590
1591         /*
1592          * Enumerate all fixed-feature devices.
1593          */
1594         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1595                 result = acpi_add_single_object(&device, acpi_root,
1596                                                 NULL,
1597                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1598                                                 &ops);
1599         }
1600
1601         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1602                 result = acpi_add_single_object(&device, acpi_root,
1603                                                 NULL,
1604                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1605                                                 &ops);
1606         }
1607
1608         return result;
1609 }
1610
1611 int __init acpi_scan_init(void)
1612 {
1613         int result;
1614         struct acpi_bus_ops ops;
1615
1616         memset(&ops, 0, sizeof(ops));
1617         ops.acpi_op_add = 1;
1618         ops.acpi_op_start = 1;
1619
1620         result = bus_register(&acpi_bus_type);
1621         if (result) {
1622                 /* We don't want to quit even if we failed to add suspend/resume */
1623                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1624         }
1625
1626         /*
1627          * Create the root device in the bus's device tree
1628          */
1629         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1630                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1631         if (result)
1632                 goto Done;
1633
1634         /*
1635          * Enumerate devices in the ACPI namespace.
1636          */
1637         result = acpi_bus_scan_fixed();
1638
1639         if (!result)
1640                 result = acpi_bus_scan(acpi_root, &ops);
1641
1642         if (result)
1643                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1644
1645 Done:
1646         return result;
1647 }