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 acpi_compatible_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->id[i].value);
  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 acpi_compatible_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->id[i].value))
 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         kfree(acpi_dev);
 313 }
 314
 315 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 316 {
 317         struct acpi_device *acpi_dev = to_acpi_device(dev);
 318         struct acpi_driver *acpi_drv = acpi_dev->driver;
 319
 320         if (acpi_drv && acpi_drv->ops.suspend)
 321                 return acpi_drv->ops.suspend(acpi_dev, state);
 322         return 0;
 323 }
 324
 325 static int acpi_device_resume(struct device *dev)
 326 {
 327         struct acpi_device *acpi_dev = to_acpi_device(dev);
 328         struct acpi_driver *acpi_drv = acpi_dev->driver;
 329
 330         if (acpi_drv && acpi_drv->ops.resume)
 331                 return acpi_drv->ops.resume(acpi_dev);
 332         return 0;
 333 }
 334
 335 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 336 {
 337         struct acpi_device *acpi_dev = to_acpi_device(dev);
 338         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 339
 340         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 341 }
 342
 343 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 344 {
 345         struct acpi_device *acpi_dev = to_acpi_device(dev);
 346         int len;
 347
 348         if (add_uevent_var(env, "MODALIAS="))
 349                 return -ENOMEM;
 350         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 351                               sizeof(env->buf) - env->buflen);
 352         if (len >= (sizeof(env->buf) - env->buflen))
 353                 return -ENOMEM;
 354         env->buflen += len;
 355         return 0;
 356 }
 357
 358 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 359 {
 360         struct acpi_device *device = data;
 361
 362         device->driver->ops.notify(device, event);
 363 }
 364
 365 static acpi_status acpi_device_notify_fixed(void *data)
 366 {
 367         struct acpi_device *device = data;
 368
 369         acpi_device_notify(device->handle, ACPI_FIXED_HARDWARE_EVENT, device);
 370         return AE_OK;
 371 }
 372
 373 static int acpi_device_install_notify_handler(struct acpi_device *device)
 374 {
 375         acpi_status status;
 376         char *hid;
 377
 378         hid = acpi_device_hid(device);
 379         if (!strcmp(hid, ACPI_BUTTON_HID_POWERF))
 380                 status =
 381                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 382                                                      acpi_device_notify_fixed,
 383                                                      device);
 384         else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEPF))
 385                 status =
 386                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 387                                                      acpi_device_notify_fixed,
 388                                                      device);
 389         else
 390                 status = acpi_install_notify_handler(device->handle,
 391                                                      ACPI_DEVICE_NOTIFY,
 392                                                      acpi_device_notify,
 393                                                      device);
 394
 395         if (ACPI_FAILURE(status))
 396                 return -EINVAL;
 397         return 0;
 398 }
 399
 400 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 401 {
 402         if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF))
 403                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 404                                                 acpi_device_notify_fixed);
 405         else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF))
 406                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 407                                                 acpi_device_notify_fixed);
 408         else
 409                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 410                                            acpi_device_notify);
 411 }
 412
 413 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 414 static int acpi_start_single_object(struct acpi_device *);
 415 static int acpi_device_probe(struct device * dev)
 416 {
 417         struct acpi_device *acpi_dev = to_acpi_device(dev);
 418         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 419         int ret;
 420
 421         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 422         if (!ret) {
 423                 if (acpi_dev->bus_ops.acpi_op_start)
 424                         acpi_start_single_object(acpi_dev);
 425
 426                 if (acpi_drv->ops.notify) {
 427                         ret = acpi_device_install_notify_handler(acpi_dev);
 428                         if (ret) {
 429                                 if (acpi_drv->ops.stop)
 430                                         acpi_drv->ops.stop(acpi_dev,
 431                                                    acpi_dev->removal_type);
 432                                 if (acpi_drv->ops.remove)
 433                                         acpi_drv->ops.remove(acpi_dev,
 434                                                      acpi_dev->removal_type);
 435                                 return ret;
 436                         }
 437                 }
 438
 439                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 440                         "Found driver [%s] for device [%s]\n",
 441                         acpi_drv->name, acpi_dev->pnp.bus_id));
 442                 get_device(dev);
 443         }
 444         return ret;
 445 }
 446
 447 static int acpi_device_remove(struct device * dev)
 448 {
 449         struct acpi_device *acpi_dev = to_acpi_device(dev);
 450         struct acpi_driver *acpi_drv = acpi_dev->driver;
 451
 452         if (acpi_drv) {
 453                 if (acpi_drv->ops.notify)
 454                         acpi_device_remove_notify_handler(acpi_dev);
 455                 if (acpi_drv->ops.stop)
 456                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 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                                  struct acpi_device *parent)
 479 {
 480         int result;
 481         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 482         int found = 0;
 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 = &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, u32 function, 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,
 922                                   acpi_handle handle, int type)
 923 {
 924         char bus_id[5] = { '?', 0 };
 925         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 926         int i = 0;
 927
 928         /*
 929          * Bus ID
 930          * ------
 931          * The device's Bus ID is simply the object name.
 932          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 933          */
 934         switch (type) {
 935         case ACPI_BUS_TYPE_SYSTEM:
 936                 strcpy(device->pnp.bus_id, "ACPI");
 937                 break;
 938         case ACPI_BUS_TYPE_POWER_BUTTON:
 939                 strcpy(device->pnp.bus_id, "PWRF");
 940                 break;
 941         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 942                 strcpy(device->pnp.bus_id, "SLPF");
 943                 break;
 944         default:
 945                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 946                 /* Clean up trailing underscores (if any) */
 947                 for (i = 3; i > 1; i--) {
 948                         if (bus_id[i] == '_')
 949                                 bus_id[i] = '\0';
 950                         else
 951                                 break;
 952                 }
 953                 strcpy(device->pnp.bus_id, bus_id);
 954                 break;
 955         }
 956 }
 957
 958 /*
 959  * acpi_bay_match - see if a device is an ejectable driver bay
 960  *
 961  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 962  * then we can safely call it an ejectable drive bay
 963  */
 964 static int acpi_bay_match(struct acpi_device *device){
 965         acpi_status status;
 966         acpi_handle handle;
 967         acpi_handle tmp;
 968         acpi_handle phandle;
 969
 970         handle = device->handle;
 971
 972         status = acpi_get_handle(handle, "_EJ0", &tmp);
 973         if (ACPI_FAILURE(status))
 974                 return -ENODEV;
 975
 976         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 977                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 978                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 979                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 980                 return 0;
 981
 982         if (acpi_get_parent(handle, &phandle))
 983                 return -ENODEV;
 984
 985         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 986                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 987                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 988                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 989                 return 0;
 990
 991         return -ENODEV;
 992 }
 993
 994 /*
 995  * acpi_dock_match - see if a device has a _DCK method
 996  */
 997 static int acpi_dock_match(struct acpi_device *device)
 998 {
 999         acpi_handle tmp;
1000         return acpi_get_handle(device->handle, "_DCK", &tmp);
1001 }
1002
1003 static void acpi_device_set_id(struct acpi_device *device,
1004                                struct acpi_device *parent, acpi_handle handle,
1005                                int type)
1006 {
1007         struct acpi_device_info *info;
1008         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1009         char *hid = NULL;
1010         char *uid = NULL;
1011         struct acpi_compatible_id_list *cid_list = NULL;
1012         const char *cid_add = NULL;
1013         acpi_status status;
1014
1015         switch (type) {
1016         case ACPI_BUS_TYPE_DEVICE:
1017                 status = acpi_get_object_info(handle, &buffer);
1018                 if (ACPI_FAILURE(status)) {
1019                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1020                         return;
1021                 }
1022
1023                 info = buffer.pointer;
1024                 if (info->valid & ACPI_VALID_HID)
1025                         hid = info->hardware_id.value;
1026                 if (info->valid & ACPI_VALID_UID)
1027                         uid = info->unique_id.value;
1028                 if (info->valid & ACPI_VALID_CID)
1029                         cid_list = &info->compatibility_id;
1030                 if (info->valid & ACPI_VALID_ADR) {
1031                         device->pnp.bus_address = info->address;
1032                         device->flags.bus_address = 1;
1033                 }
1034
1035                 /* If we have a video/bay/dock device, add our selfdefined
1036                    HID to the CID list. Like that the video/bay/dock drivers
1037                    will get autoloaded and the device might still match
1038                    against another driver.
1039                 */
1040                 if (acpi_is_video_device(device))
1041                         cid_add = ACPI_VIDEO_HID;
1042                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1043                         cid_add = ACPI_BAY_HID;
1044                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1045                         cid_add = ACPI_DOCK_HID;
1046
1047                 break;
1048         case ACPI_BUS_TYPE_POWER:
1049                 hid = ACPI_POWER_HID;
1050                 break;
1051         case ACPI_BUS_TYPE_PROCESSOR:
1052                 hid = ACPI_PROCESSOR_OBJECT_HID;
1053                 break;
1054         case ACPI_BUS_TYPE_SYSTEM:
1055                 hid = ACPI_SYSTEM_HID;
1056                 break;
1057         case ACPI_BUS_TYPE_THERMAL:
1058                 hid = ACPI_THERMAL_HID;
1059                 break;
1060         case ACPI_BUS_TYPE_POWER_BUTTON:
1061                 hid = ACPI_BUTTON_HID_POWERF;
1062                 break;
1063         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1064                 hid = ACPI_BUTTON_HID_SLEEPF;
1065                 break;
1066         }
1067
1068         /*
1069          * \_SB
1070          * ----
1071          * Fix for the system root bus device -- the only root-level device.
1072          */
1073         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1074                 hid = ACPI_BUS_HID;
1075                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1076                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1077         }
1078
1079         if (hid) {
1080                 strcpy(device->pnp.hardware_id, hid);
1081                 device->flags.hardware_id = 1;
1082         }
1083         if (uid) {
1084                 strcpy(device->pnp.unique_id, uid);
1085                 device->flags.unique_id = 1;
1086         }
1087         if (cid_list || cid_add) {
1088                 struct  acpi_compatible_id_list *list;
1089                 int size = 0;
1090                 int count = 0;
1091
1092                 if (cid_list) {
1093                         size = cid_list->size;
1094                 } else if (cid_add) {
1095                         size = sizeof(struct acpi_compatible_id_list);
1096                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1097                         if (!cid_list) {
1098                                 printk(KERN_ERR "Memory allocation error\n");
1099                                 kfree(buffer.pointer);
1100                                 return;
1101                         } else {
1102                                 cid_list->count = 0;
1103                                 cid_list->size = size;
1104                         }
1105                 }
1106                 if (cid_add)
1107                         size += sizeof(struct acpi_compatible_id);
1108                 list = kmalloc(size, GFP_KERNEL);
1109
1110                 if (list) {
1111                         if (cid_list) {
1112                                 memcpy(list, cid_list, cid_list->size);
1113                                 count = cid_list->count;
1114                         }
1115                         if (cid_add) {
1116                                 strncpy(list->id[count].value, cid_add,
1117                                         ACPI_MAX_CID_LENGTH);
1118                                 count++;
1119                                 device->flags.compatible_ids = 1;
1120                         }
1121                         list->size = size;
1122                         list->count = count;
1123                         device->pnp.cid_list = list;
1124                 } else
1125                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1126         }
1127
1128         kfree(buffer.pointer);
1129 }
1130
1131 static int acpi_device_set_context(struct acpi_device *device, int type)
1132 {
1133         acpi_status status = AE_OK;
1134         int result = 0;
1135         /*
1136          * Context
1137          * -------
1138          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1139          * resolutions from handle->device very efficient.  Note that we need
1140          * to be careful with fixed-feature devices as they all attach to the
1141          * root object.
1142          */
1143         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1144             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1145                 status = acpi_attach_data(device->handle,
1146                                           acpi_bus_data_handler, device);
1147
1148                 if (ACPI_FAILURE(status)) {
1149                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1150                         result = -ENODEV;
1151                 }
1152         }
1153         return result;
1154 }
1155
1156 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1157 {
1158         if (!dev)
1159                 return -EINVAL;
1160
1161         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1162         device_release_driver(&dev->dev);
1163
1164         if (!rmdevice)
1165                 return 0;
1166
1167         /*
1168          * unbind _ADR-Based Devices when hot removal
1169          */
1170         if (dev->flags.bus_address) {
1171                 if ((dev->parent) && (dev->parent->ops.unbind))
1172                         dev->parent->ops.unbind(dev);
1173         }
1174         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1175
1176         return 0;
1177 }
1178
1179 static int
1180 acpi_add_single_object(struct acpi_device **child,
1181                        struct acpi_device *parent, acpi_handle handle, int type,
1182                         struct acpi_bus_ops *ops)
1183 {
1184         int result = 0;
1185         struct acpi_device *device = NULL;
1186
1187
1188         if (!child)
1189                 return -EINVAL;
1190
1191         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1192         if (!device) {
1193                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1194                 return -ENOMEM;
1195         }
1196
1197         device->handle = handle;
1198         device->parent = parent;
1199         device->bus_ops = *ops; /* workround for not call .start */
1200
1201
1202         acpi_device_get_busid(device, handle, type);
1203
1204         /*
1205          * Flags
1206          * -----
1207          * Get prior to calling acpi_bus_get_status() so we know whether
1208          * or not _STA is present.  Note that we only look for object
1209          * handles -- cannot evaluate objects until we know the device is
1210          * present and properly initialized.
1211          */
1212         result = acpi_bus_get_flags(device);
1213         if (result)
1214                 goto end;
1215
1216         /*
1217          * Status
1218          * ------
1219          * See if the device is present.  We always assume that non-Device
1220          * and non-Processor objects (e.g. thermal zones, power resources,
1221          * etc.) are present, functioning, etc. (at least when parent object
1222          * is present).  Note that _STA has a different meaning for some
1223          * objects (e.g. power resources) so we need to be careful how we use
1224          * it.
1225          */
1226         switch (type) {
1227         case ACPI_BUS_TYPE_PROCESSOR:
1228         case ACPI_BUS_TYPE_DEVICE:
1229                 result = acpi_bus_get_status(device);
1230                 if (ACPI_FAILURE(result)) {
1231                         result = -ENODEV;
1232                         goto end;
1233                 }
1234                 /*
1235                  * When the device is neither present nor functional, the
1236                  * device should not be added to Linux ACPI device tree.
1237                  * When the status of the device is not present but functinal,
1238                  * it should be added to Linux ACPI tree. For example : bay
1239                  * device , dock device.
1240                  * In such conditions it is unncessary to check whether it is
1241                  * bay device or dock device.
1242                  */
1243                 if (!device->status.present && !device->status.functional) {
1244                         result = -ENODEV;
1245                         goto end;
1246                 }
1247                 break;
1248         default:
1249                 STRUCT_TO_INT(device->status) =
1250                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1251                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1252                 break;
1253         }
1254
1255         /*
1256          * Initialize Device
1257          * -----------------
1258          * TBD: Synch with Core's enumeration/initialization process.
1259          */
1260
1261         /*
1262          * Hardware ID, Unique ID, & Bus Address
1263          * -------------------------------------
1264          */
1265         acpi_device_set_id(device, parent, handle, type);
1266
1267         /*
1268          * The ACPI device is attached to acpi handle before getting
1269          * the power/wakeup/peformance flags. Otherwise OS can't get
1270          * the corresponding ACPI device by the acpi handle in the course
1271          * of getting the power/wakeup/performance flags.
1272          */
1273         result = acpi_device_set_context(device, type);
1274         if (result)
1275                 goto end;
1276
1277         /*
1278          * Power Management
1279          * ----------------
1280          */
1281         if (device->flags.power_manageable) {
1282                 result = acpi_bus_get_power_flags(device);
1283                 if (result)
1284                         goto end;
1285         }
1286
1287         /*
1288          * Wakeup device management
1289          *-----------------------
1290          */
1291         if (device->flags.wake_capable) {
1292                 result = acpi_bus_get_wakeup_device_flags(device);
1293                 if (result)
1294                         goto end;
1295         }
1296
1297         /*
1298          * Performance Management
1299          * ----------------------
1300          */
1301         if (device->flags.performance_manageable) {
1302                 result = acpi_bus_get_perf_flags(device);
1303                 if (result)
1304                         goto end;
1305         }
1306
1307
1308         result = acpi_device_register(device, parent);
1309
1310         /*
1311          * Bind _ADR-Based Devices when hot add
1312          */
1313         if (device->flags.bus_address) {
1314                 if (device->parent && device->parent->ops.bind)
1315                         device->parent->ops.bind(device);
1316         }
1317
1318 end:
1319         if (!result)
1320                 *child = device;
1321         else {
1322                 kfree(device->pnp.cid_list);
1323                 kfree(device);
1324         }
1325
1326         return result;
1327 }
1328
1329 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1330 {
1331         acpi_status status = AE_OK;
1332         struct acpi_device *parent = NULL;
1333         struct acpi_device *child = NULL;
1334         acpi_handle phandle = NULL;
1335         acpi_handle chandle = NULL;
1336         acpi_object_type type = 0;
1337         u32 level = 1;
1338
1339
1340         if (!start)
1341                 return -EINVAL;
1342
1343         parent = start;
1344         phandle = start->handle;
1345
1346         /*
1347          * Parse through the ACPI namespace, identify all 'devices', and
1348          * create a new 'struct acpi_device' for each.
1349          */
1350         while ((level > 0) && parent) {
1351
1352                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1353                                               chandle, &chandle);
1354
1355                 /*
1356                  * If this scope is exhausted then move our way back up.
1357                  */
1358                 if (ACPI_FAILURE(status)) {
1359                         level--;
1360                         chandle = phandle;
1361                         acpi_get_parent(phandle, &phandle);
1362                         if (parent->parent)
1363                                 parent = parent->parent;
1364                         continue;
1365                 }
1366
1367                 status = acpi_get_type(chandle, &type);
1368                 if (ACPI_FAILURE(status))
1369                         continue;
1370
1371                 /*
1372                  * If this is a scope object then parse it (depth-first).
1373                  */
1374                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1375                         level++;
1376                         phandle = chandle;
1377                         chandle = NULL;
1378                         continue;
1379                 }
1380
1381                 /*
1382                  * We're only interested in objects that we consider 'devices'.
1383                  */
1384                 switch (type) {
1385                 case ACPI_TYPE_DEVICE:
1386                         type = ACPI_BUS_TYPE_DEVICE;
1387                         break;
1388                 case ACPI_TYPE_PROCESSOR:
1389                         type = ACPI_BUS_TYPE_PROCESSOR;
1390                         break;
1391                 case ACPI_TYPE_THERMAL:
1392                         type = ACPI_BUS_TYPE_THERMAL;
1393                         break;
1394                 case ACPI_TYPE_POWER:
1395                         type = ACPI_BUS_TYPE_POWER;
1396                         break;
1397                 default:
1398                         continue;
1399                 }
1400
1401                 if (ops->acpi_op_add)
1402                         status = acpi_add_single_object(&child, parent,
1403                                 chandle, type, ops);
1404                 else
1405                         status = acpi_bus_get_device(chandle, &child);
1406
1407                 if (ACPI_FAILURE(status))
1408                         continue;
1409
1410                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1411                         status = acpi_start_single_object(child);
1412                         if (ACPI_FAILURE(status))
1413                                 continue;
1414                 }
1415
1416                 /*
1417                  * If the device is present, enabled, and functioning then
1418                  * parse its scope (depth-first).  Note that we need to
1419                  * represent absent devices to facilitate PnP notifications
1420                  * -- but only the subtree head (not all of its children,
1421                  * which will be enumerated when the parent is inserted).
1422                  *
1423                  * TBD: Need notifications and other detection mechanisms
1424                  *      in place before we can fully implement this.
1425                  */
1426                  /*
1427                  * When the device is not present but functional, it is also
1428                  * necessary to scan the children of this device.
1429                  */
1430                 if (child->status.present || (!child->status.present &&
1431                                         child->status.functional)) {
1432                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1433                                                       NULL, NULL);
1434                         if (ACPI_SUCCESS(status)) {
1435                                 level++;
1436                                 phandle = chandle;
1437                                 chandle = NULL;
1438                                 parent = child;
1439                         }
1440                 }
1441         }
1442
1443         return 0;
1444 }
1445
1446 int
1447 acpi_bus_add(struct acpi_device **child,
1448              struct acpi_device *parent, acpi_handle handle, int type)
1449 {
1450         int result;
1451         struct acpi_bus_ops ops;
1452
1453         memset(&ops, 0, sizeof(ops));
1454         ops.acpi_op_add = 1;
1455
1456         result = acpi_add_single_object(child, parent, handle, type, &ops);
1457         if (!result)
1458                 result = acpi_bus_scan(*child, &ops);
1459
1460         return result;
1461 }
1462 EXPORT_SYMBOL(acpi_bus_add);
1463
1464 int acpi_bus_start(struct acpi_device *device)
1465 {
1466         int result;
1467         struct acpi_bus_ops ops;
1468
1469
1470         if (!device)
1471                 return -EINVAL;
1472
1473         result = acpi_start_single_object(device);
1474         if (!result) {
1475                 memset(&ops, 0, sizeof(ops));
1476                 ops.acpi_op_start = 1;
1477                 result = acpi_bus_scan(device, &ops);
1478         }
1479         return result;
1480 }
1481 EXPORT_SYMBOL(acpi_bus_start);
1482
1483 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1484 {
1485         acpi_status status;
1486         struct acpi_device *parent, *child;
1487         acpi_handle phandle, chandle;
1488         acpi_object_type type;
1489         u32 level = 1;
1490         int err = 0;
1491
1492         parent = start;
1493         phandle = start->handle;
1494         child = chandle = NULL;
1495
1496         while ((level > 0) && parent && (!err)) {
1497                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1498                                               chandle, &chandle);
1499
1500                 /*
1501                  * If this scope is exhausted then move our way back up.
1502                  */
1503                 if (ACPI_FAILURE(status)) {
1504                         level--;
1505                         chandle = phandle;
1506                         acpi_get_parent(phandle, &phandle);
1507                         child = parent;
1508                         parent = parent->parent;
1509
1510                         if (level == 0)
1511                                 err = acpi_bus_remove(child, rmdevice);
1512                         else
1513                                 err = acpi_bus_remove(child, 1);
1514
1515                         continue;
1516                 }
1517
1518                 status = acpi_get_type(chandle, &type);
1519                 if (ACPI_FAILURE(status)) {
1520                         continue;
1521                 }
1522                 /*
1523                  * If there is a device corresponding to chandle then
1524                  * parse it (depth-first).
1525                  */
1526                 if (acpi_bus_get_device(chandle, &child) == 0) {
1527                         level++;
1528                         phandle = chandle;
1529                         chandle = NULL;
1530                         parent = child;
1531                 }
1532                 continue;
1533         }
1534         return err;
1535 }
1536 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1537
1538 static int acpi_bus_scan_fixed(struct acpi_device *root)
1539 {
1540         int result = 0;
1541         struct acpi_device *device = NULL;
1542         struct acpi_bus_ops ops;
1543
1544         if (!root)
1545                 return -ENODEV;
1546
1547         memset(&ops, 0, sizeof(ops));
1548         ops.acpi_op_add = 1;
1549         ops.acpi_op_start = 1;
1550
1551         /*
1552          * Enumerate all fixed-feature devices.
1553          */
1554         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1555                 result = acpi_add_single_object(&device, acpi_root,
1556                                                 NULL,
1557                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1558                                                 &ops);
1559         }
1560
1561         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1562                 result = acpi_add_single_object(&device, acpi_root,
1563                                                 NULL,
1564                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1565                                                 &ops);
1566         }
1567
1568         return result;
1569 }
1570
1571 int __init acpi_scan_init(void)
1572 {
1573         int result;
1574         struct acpi_bus_ops ops;
1575
1576         memset(&ops, 0, sizeof(ops));
1577         ops.acpi_op_add = 1;
1578         ops.acpi_op_start = 1;
1579
1580         result = bus_register(&acpi_bus_type);
1581         if (result) {
1582                 /* We don't want to quit even if we failed to add suspend/resume */
1583                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1584         }
1585
1586         /*
1587          * Create the root device in the bus's device tree
1588          */
1589         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1590                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1591         if (result)
1592                 goto Done;
1593
1594         /*
1595          * Enumerate devices in the ACPI namespace.
1596          */
1597         result = acpi_bus_scan_fixed(acpi_root);
1598
1599         if (!result)
1600                 result = acpi_bus_scan(acpi_root, &ops);
1601
1602         if (result)
1603                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1604
1605 Done:
1606         return result;
1607 }