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/slab.h>
   8 #include <linux/kernel.h>
   9 #include <linux/acpi.h>
  10 #include <linux/signal.h>
  11 #include <linux/kthread.h>
  12 #include <linux/dmi.h>
  13 #include <linux/nls.h>
  14
  15 #include <acpi/acpi_drivers.h>
  16
  17 #include "internal.h"
  18
  19 #define _COMPONENT              ACPI_BUS_COMPONENT
  20 ACPI_MODULE_NAME("scan");
  21 #define STRUCT_TO_INT(s)        (*((int*)&s))
  22 extern struct acpi_device *acpi_root;
  23
  24 #define ACPI_BUS_CLASS                  "system_bus"
  25 #define ACPI_BUS_HID                    "LNXSYBUS"
  26 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  27
  28 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  29
  30 static const char *dummy_hid = "device";
  31
  32 /*
  33  * The following ACPI IDs are known to be suitable for representing as
  34  * platform devices.
  35  */
  36 static const struct acpi_device_id acpi_platform_device_ids[] = {
  37
  38         { "PNP0D40" },
  39
  40         /* Haswell LPSS devices */
  41         { "INT33C0", 0 },
  42         { "INT33C1", 0 },
  43         { "INT33C2", 0 },
  44         { "INT33C3", 0 },
  45         { "INT33C4", 0 },
  46         { "INT33C5", 0 },
  47         { "INT33C6", 0 },
  48         { "INT33C7", 0 },
  49
  50         { }
  51 };
  52
  53 static LIST_HEAD(acpi_device_list);
  54 static LIST_HEAD(acpi_bus_id_list);
  55 DEFINE_MUTEX(acpi_device_lock);
  56 LIST_HEAD(acpi_wakeup_device_list);
  57
  58 struct acpi_device_bus_id{
  59         char bus_id[15];
  60         unsigned int instance_no;
  61         struct list_head node;
  62 };
  63
  64 /*
  65  * Creates hid/cid(s) string needed for modalias and uevent
  66  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  67  * char *modalias: "acpi:IBM0001:ACPI0001"
  68 */
  69 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  70                            int size)
  71 {
  72         int len;
  73         int count;
  74         struct acpi_hardware_id *id;
  75
  76         if (list_empty(&acpi_dev->pnp.ids))
  77                 return 0;
  78
  79         len = snprintf(modalias, size, "acpi:");
  80         size -= len;
  81
  82         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
  83                 count = snprintf(&modalias[len], size, "%s:", id->id);
  84                 if (count < 0 || count >= size)
  85                         return -EINVAL;
  86                 len += count;
  87                 size -= count;
  88         }
  89
  90         modalias[len] = '\0';
  91         return len;
  92 }
  93
  94 static ssize_t
  95 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  96         struct acpi_device *acpi_dev = to_acpi_device(dev);
  97         int len;
  98
  99         /* Device has no HID and no CID or string is >1024 */
 100         len = create_modalias(acpi_dev, buf, 1024);
 101         if (len <= 0)
 102                 return 0;
 103         buf[len++] = '\n';
 104         return len;
 105 }
 106 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 107
 108 /**
 109  * acpi_bus_hot_remove_device: hot-remove a device and its children
 110  * @context: struct acpi_eject_event pointer (freed in this func)
 111  *
 112  * Hot-remove a device and its children. This function frees up the
 113  * memory space passed by arg context, so that the caller may call
 114  * this function asynchronously through acpi_os_hotplug_execute().
 115  */
 116 void acpi_bus_hot_remove_device(void *context)
 117 {
 118         struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
 119         struct acpi_device *device = ej_event->device;
 120         acpi_handle handle = device->handle;
 121         acpi_handle temp;
 122         struct acpi_object_list arg_list;
 123         union acpi_object arg;
 124         acpi_status status = AE_OK;
 125         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 126
 127         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 128                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 129
 130         if (acpi_bus_trim(device)) {
 131                 printk(KERN_ERR PREFIX
 132                                 "Removing device failed\n");
 133                 goto err_out;
 134         }
 135
 136         /* device has been freed */
 137         device = NULL;
 138
 139         /* power off device */
 140         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 141         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 142                 printk(KERN_WARNING PREFIX
 143                                 "Power-off device failed\n");
 144
 145         if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
 146                 arg_list.count = 1;
 147                 arg_list.pointer = &arg;
 148                 arg.type = ACPI_TYPE_INTEGER;
 149                 arg.integer.value = 0;
 150                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 151         }
 152
 153         arg_list.count = 1;
 154         arg_list.pointer = &arg;
 155         arg.type = ACPI_TYPE_INTEGER;
 156         arg.integer.value = 1;
 157
 158         /*
 159          * TBD: _EJD support.
 160          */
 161         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 162         if (ACPI_FAILURE(status)) {
 163                 if (status != AE_NOT_FOUND)
 164                         printk(KERN_WARNING PREFIX
 165                                         "Eject device failed\n");
 166                 goto err_out;
 167         }
 168
 169         kfree(context);
 170         return;
 171
 172 err_out:
 173         /* Inform firmware the hot-remove operation has completed w/ error */
 174         (void) acpi_evaluate_hotplug_ost(handle,
 175                                 ej_event->event, ost_code, NULL);
 176         kfree(context);
 177         return;
 178 }
 179 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 180
 181 static ssize_t
 182 acpi_eject_store(struct device *d, struct device_attribute *attr,
 183                 const char *buf, size_t count)
 184 {
 185         int ret = count;
 186         acpi_status status;
 187         acpi_object_type type = 0;
 188         struct acpi_device *acpi_device = to_acpi_device(d);
 189         struct acpi_eject_event *ej_event;
 190
 191         if ((!count) || (buf[0] != '1')) {
 192                 return -EINVAL;
 193         }
 194 #ifndef FORCE_EJECT
 195         if (acpi_device->driver == NULL) {
 196                 ret = -ENODEV;
 197                 goto err;
 198         }
 199 #endif
 200         status = acpi_get_type(acpi_device->handle, &type);
 201         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 202                 ret = -ENODEV;
 203                 goto err;
 204         }
 205
 206         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 207         if (!ej_event) {
 208                 ret = -ENOMEM;
 209                 goto err;
 210         }
 211
 212         ej_event->device = acpi_device;
 213         if (acpi_device->flags.eject_pending) {
 214                 /* event originated from ACPI eject notification */
 215                 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
 216                 acpi_device->flags.eject_pending = 0;
 217         } else {
 218                 /* event originated from user */
 219                 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
 220                 (void) acpi_evaluate_hotplug_ost(acpi_device->handle,
 221                         ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 222         }
 223
 224         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
 225 err:
 226         return ret;
 227 }
 228
 229 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 230
 231 static ssize_t
 232 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 233         struct acpi_device *acpi_dev = to_acpi_device(dev);
 234
 235         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 236 }
 237 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 238
 239 static ssize_t acpi_device_uid_show(struct device *dev,
 240                                     struct device_attribute *attr, char *buf)
 241 {
 242         struct acpi_device *acpi_dev = to_acpi_device(dev);
 243
 244         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 245 }
 246 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 247
 248 static ssize_t acpi_device_adr_show(struct device *dev,
 249                                     struct device_attribute *attr, char *buf)
 250 {
 251         struct acpi_device *acpi_dev = to_acpi_device(dev);
 252
 253         return sprintf(buf, "0x%08x\n",
 254                        (unsigned int)(acpi_dev->pnp.bus_address));
 255 }
 256 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 257
 258 static ssize_t
 259 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 260         struct acpi_device *acpi_dev = to_acpi_device(dev);
 261         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 262         int result;
 263
 264         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 265         if (result)
 266                 goto end;
 267
 268         result = sprintf(buf, "%s\n", (char*)path.pointer);
 269         kfree(path.pointer);
 270 end:
 271         return result;
 272 }
 273 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 274
 275 /* sysfs file that shows description text from the ACPI _STR method */
 276 static ssize_t description_show(struct device *dev,
 277                                 struct device_attribute *attr,
 278                                 char *buf) {
 279         struct acpi_device *acpi_dev = to_acpi_device(dev);
 280         int result;
 281
 282         if (acpi_dev->pnp.str_obj == NULL)
 283                 return 0;
 284
 285         /*
 286          * The _STR object contains a Unicode identifier for a device.
 287          * We need to convert to utf-8 so it can be displayed.
 288          */
 289         result = utf16s_to_utf8s(
 290                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 291                 acpi_dev->pnp.str_obj->buffer.length,
 292                 UTF16_LITTLE_ENDIAN, buf,
 293                 PAGE_SIZE);
 294
 295         buf[result++] = '\n';
 296
 297         return result;
 298 }
 299 static DEVICE_ATTR(description, 0444, description_show, NULL);
 300
 301 static ssize_t
 302 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 303                      char *buf) {
 304         struct acpi_device *acpi_dev = to_acpi_device(dev);
 305
 306         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 307 }
 308 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 309
 310 static int acpi_device_setup_files(struct acpi_device *dev)
 311 {
 312         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 313         acpi_status status;
 314         acpi_handle temp;
 315         unsigned long long sun;
 316         int result = 0;
 317
 318         /*
 319          * Devices gotten from FADT don't have a "path" attribute
 320          */
 321         if (dev->handle) {
 322                 result = device_create_file(&dev->dev, &dev_attr_path);
 323                 if (result)
 324                         goto end;
 325         }
 326
 327         if (!list_empty(&dev->pnp.ids)) {
 328                 result = device_create_file(&dev->dev, &dev_attr_hid);
 329                 if (result)
 330                         goto end;
 331
 332                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 333                 if (result)
 334                         goto end;
 335         }
 336
 337         /*
 338          * If device has _STR, 'description' file is created
 339          */
 340         status = acpi_get_handle(dev->handle, "_STR", &temp);
 341         if (ACPI_SUCCESS(status)) {
 342                 status = acpi_evaluate_object(dev->handle, "_STR",
 343                                         NULL, &buffer);
 344                 if (ACPI_FAILURE(status))
 345                         buffer.pointer = NULL;
 346                 dev->pnp.str_obj = buffer.pointer;
 347                 result = device_create_file(&dev->dev, &dev_attr_description);
 348                 if (result)
 349                         goto end;
 350         }
 351
 352         if (dev->flags.bus_address)
 353                 result = device_create_file(&dev->dev, &dev_attr_adr);
 354         if (dev->pnp.unique_id)
 355                 result = device_create_file(&dev->dev, &dev_attr_uid);
 356
 357         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 358         if (ACPI_SUCCESS(status)) {
 359                 dev->pnp.sun = (unsigned long)sun;
 360                 result = device_create_file(&dev->dev, &dev_attr_sun);
 361                 if (result)
 362                         goto end;
 363         } else {
 364                 dev->pnp.sun = (unsigned long)-1;
 365         }
 366
 367         /*
 368          * If device has _EJ0, 'eject' file is created that is used to trigger
 369          * hot-removal function from userland.
 370          */
 371         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 372         if (ACPI_SUCCESS(status))
 373                 result = device_create_file(&dev->dev, &dev_attr_eject);
 374 end:
 375         return result;
 376 }
 377
 378 static void acpi_device_remove_files(struct acpi_device *dev)
 379 {
 380         acpi_status status;
 381         acpi_handle temp;
 382
 383         /*
 384          * If device has _STR, remove 'description' file
 385          */
 386         status = acpi_get_handle(dev->handle, "_STR", &temp);
 387         if (ACPI_SUCCESS(status)) {
 388                 kfree(dev->pnp.str_obj);
 389                 device_remove_file(&dev->dev, &dev_attr_description);
 390         }
 391         /*
 392          * If device has _EJ0, remove 'eject' file.
 393          */
 394         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 395         if (ACPI_SUCCESS(status))
 396                 device_remove_file(&dev->dev, &dev_attr_eject);
 397
 398         status = acpi_get_handle(dev->handle, "_SUN", &temp);
 399         if (ACPI_SUCCESS(status))
 400                 device_remove_file(&dev->dev, &dev_attr_sun);
 401
 402         if (dev->pnp.unique_id)
 403                 device_remove_file(&dev->dev, &dev_attr_uid);
 404         if (dev->flags.bus_address)
 405                 device_remove_file(&dev->dev, &dev_attr_adr);
 406         device_remove_file(&dev->dev, &dev_attr_modalias);
 407         device_remove_file(&dev->dev, &dev_attr_hid);
 408         if (dev->handle)
 409                 device_remove_file(&dev->dev, &dev_attr_path);
 410 }
 411 /* --------------------------------------------------------------------------
 412                         ACPI Bus operations
 413    -------------------------------------------------------------------------- */
 414
 415 static const struct acpi_device_id *__acpi_match_device(
 416         struct acpi_device *device, const struct acpi_device_id *ids)
 417 {
 418         const struct acpi_device_id *id;
 419         struct acpi_hardware_id *hwid;
 420
 421         /*
 422          * If the device is not present, it is unnecessary to load device
 423          * driver for it.
 424          */
 425         if (!device->status.present)
 426                 return NULL;
 427
 428         for (id = ids; id->id[0]; id++)
 429                 list_for_each_entry(hwid, &device->pnp.ids, list)
 430                         if (!strcmp((char *) id->id, hwid->id))
 431                                 return id;
 432
 433         return NULL;
 434 }
 435
 436 /**
 437  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 438  * @ids: Array of struct acpi_device_id object to match against.
 439  * @dev: The device structure to match.
 440  *
 441  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 442  * object for that handle and use that object to match against a given list of
 443  * device IDs.
 444  *
 445  * Return a pointer to the first matching ID on success or %NULL on failure.
 446  */
 447 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 448                                                const struct device *dev)
 449 {
 450         struct acpi_device *adev;
 451
 452         if (!ids || !ACPI_HANDLE(dev)
 453             || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
 454                 return NULL;
 455
 456         return __acpi_match_device(adev, ids);
 457 }
 458 EXPORT_SYMBOL_GPL(acpi_match_device);
 459
 460 int acpi_match_device_ids(struct acpi_device *device,
 461                           const struct acpi_device_id *ids)
 462 {
 463         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 464 }
 465 EXPORT_SYMBOL(acpi_match_device_ids);
 466
 467 static void acpi_free_ids(struct acpi_device *device)
 468 {
 469         struct acpi_hardware_id *id, *tmp;
 470
 471         list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
 472                 kfree(id->id);
 473                 kfree(id);
 474         }
 475 }
 476
 477 static void acpi_device_release(struct device *dev)
 478 {
 479         struct acpi_device *acpi_dev = to_acpi_device(dev);
 480
 481         acpi_free_ids(acpi_dev);
 482         kfree(acpi_dev->pnp.unique_id);
 483         kfree(acpi_dev);
 484 }
 485
 486 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 487 {
 488         struct acpi_device *acpi_dev = to_acpi_device(dev);
 489         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 490
 491         return acpi_dev->flags.match_driver
 492                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 493 }
 494
 495 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 496 {
 497         struct acpi_device *acpi_dev = to_acpi_device(dev);
 498         int len;
 499
 500         if (list_empty(&acpi_dev->pnp.ids))
 501                 return 0;
 502
 503         if (add_uevent_var(env, "MODALIAS="))
 504                 return -ENOMEM;
 505         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 506                               sizeof(env->buf) - env->buflen);
 507         if (len >= (sizeof(env->buf) - env->buflen))
 508                 return -ENOMEM;
 509         env->buflen += len;
 510         return 0;
 511 }
 512
 513 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 514 {
 515         struct acpi_device *device = data;
 516
 517         device->driver->ops.notify(device, event);
 518 }
 519
 520 static acpi_status acpi_device_notify_fixed(void *data)
 521 {
 522         struct acpi_device *device = data;
 523
 524         /* Fixed hardware devices have no handles */
 525         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 526         return AE_OK;
 527 }
 528
 529 static int acpi_device_install_notify_handler(struct acpi_device *device)
 530 {
 531         acpi_status status;
 532
 533         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 534                 status =
 535                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 536                                                      acpi_device_notify_fixed,
 537                                                      device);
 538         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 539                 status =
 540                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 541                                                      acpi_device_notify_fixed,
 542                                                      device);
 543         else
 544                 status = acpi_install_notify_handler(device->handle,
 545                                                      ACPI_DEVICE_NOTIFY,
 546                                                      acpi_device_notify,
 547                                                      device);
 548
 549         if (ACPI_FAILURE(status))
 550                 return -EINVAL;
 551         return 0;
 552 }
 553
 554 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 555 {
 556         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 557                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 558                                                 acpi_device_notify_fixed);
 559         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 560                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 561                                                 acpi_device_notify_fixed);
 562         else
 563                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 564                                            acpi_device_notify);
 565 }
 566
 567 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 568 static int acpi_device_probe(struct device * dev)
 569 {
 570         struct acpi_device *acpi_dev = to_acpi_device(dev);
 571         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 572         int ret;
 573
 574         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 575         if (!ret) {
 576                 if (acpi_drv->ops.notify) {
 577                         ret = acpi_device_install_notify_handler(acpi_dev);
 578                         if (ret) {
 579                                 if (acpi_drv->ops.remove)
 580                                         acpi_drv->ops.remove(acpi_dev);
 581                                 return ret;
 582                         }
 583                 }
 584
 585                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 586                         "Found driver [%s] for device [%s]\n",
 587                         acpi_drv->name, acpi_dev->pnp.bus_id));
 588                 get_device(dev);
 589         }
 590         return ret;
 591 }
 592
 593 static int acpi_device_remove(struct device * dev)
 594 {
 595         struct acpi_device *acpi_dev = to_acpi_device(dev);
 596         struct acpi_driver *acpi_drv = acpi_dev->driver;
 597
 598         if (acpi_drv) {
 599                 if (acpi_drv->ops.notify)
 600                         acpi_device_remove_notify_handler(acpi_dev);
 601                 if (acpi_drv->ops.remove)
 602                         acpi_drv->ops.remove(acpi_dev);
 603         }
 604         acpi_dev->driver = NULL;
 605         acpi_dev->driver_data = NULL;
 606
 607         put_device(dev);
 608         return 0;
 609 }
 610
 611 struct bus_type acpi_bus_type = {
 612         .name           = "acpi",
 613         .match          = acpi_bus_match,
 614         .probe          = acpi_device_probe,
 615         .remove         = acpi_device_remove,
 616         .uevent         = acpi_device_uevent,
 617 };
 618
 619 static int acpi_device_register(struct acpi_device *device)
 620 {
 621         int result;
 622         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 623         int found = 0;
 624
 625         /*
 626          * Linkage
 627          * -------
 628          * Link this device to its parent and siblings.
 629          */
 630         INIT_LIST_HEAD(&device->children);
 631         INIT_LIST_HEAD(&device->node);
 632         INIT_LIST_HEAD(&device->wakeup_list);
 633         INIT_LIST_HEAD(&device->physical_node_list);
 634         mutex_init(&device->physical_node_lock);
 635
 636         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 637         if (!new_bus_id) {
 638                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 639                 return -ENOMEM;
 640         }
 641
 642         mutex_lock(&acpi_device_lock);
 643         /*
 644          * Find suitable bus_id and instance number in acpi_bus_id_list
 645          * If failed, create one and link it into acpi_bus_id_list
 646          */
 647         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 648                 if (!strcmp(acpi_device_bus_id->bus_id,
 649                             acpi_device_hid(device))) {
 650                         acpi_device_bus_id->instance_no++;
 651                         found = 1;
 652                         kfree(new_bus_id);
 653                         break;
 654                 }
 655         }
 656         if (!found) {
 657                 acpi_device_bus_id = new_bus_id;
 658                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 659                 acpi_device_bus_id->instance_no = 0;
 660                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 661         }
 662         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 663
 664         if (device->parent)
 665                 list_add_tail(&device->node, &device->parent->children);
 666
 667         if (device->wakeup.flags.valid)
 668                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 669         mutex_unlock(&acpi_device_lock);
 670
 671         if (device->parent)
 672                 device->dev.parent = &device->parent->dev;
 673         device->dev.bus = &acpi_bus_type;
 674         device->dev.release = &acpi_device_release;
 675         result = device_register(&device->dev);
 676         if (result) {
 677                 dev_err(&device->dev, "Error registering device\n");
 678                 goto end;
 679         }
 680
 681         result = acpi_device_setup_files(device);
 682         if (result)
 683                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 684                        dev_name(&device->dev));
 685
 686         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 687         return 0;
 688 end:
 689         mutex_lock(&acpi_device_lock);
 690         if (device->parent)
 691                 list_del(&device->node);
 692         list_del(&device->wakeup_list);
 693         mutex_unlock(&acpi_device_lock);
 694         return result;
 695 }
 696
 697 static void acpi_device_unregister(struct acpi_device *device)
 698 {
 699         mutex_lock(&acpi_device_lock);
 700         if (device->parent)
 701                 list_del(&device->node);
 702
 703         list_del(&device->wakeup_list);
 704         mutex_unlock(&acpi_device_lock);
 705
 706         acpi_detach_data(device->handle, acpi_bus_data_handler);
 707
 708         acpi_device_remove_files(device);
 709         device_unregister(&device->dev);
 710 }
 711
 712 /* --------------------------------------------------------------------------
 713                                  Driver Management
 714    -------------------------------------------------------------------------- */
 715 /**
 716  * acpi_bus_driver_init - add a device to a driver
 717  * @device: the device to add and initialize
 718  * @driver: driver for the device
 719  *
 720  * Used to initialize a device via its device driver.  Called whenever a
 721  * driver is bound to a device.  Invokes the driver's add() ops.
 722  */
 723 static int
 724 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 725 {
 726         int result = 0;
 727
 728         if (!device || !driver)
 729                 return -EINVAL;
 730
 731         if (!driver->ops.add)
 732                 return -ENOSYS;
 733
 734         result = driver->ops.add(device);
 735         if (result) {
 736                 device->driver = NULL;
 737                 device->driver_data = NULL;
 738                 return result;
 739         }
 740
 741         device->driver = driver;
 742
 743         /*
 744          * TBD - Configuration Management: Assign resources to device based
 745          * upon possible configuration and currently allocated resources.
 746          */
 747
 748         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 749                           "Driver successfully bound to device\n"));
 750         return 0;
 751 }
 752
 753 /**
 754  * acpi_bus_register_driver - register a driver with the ACPI bus
 755  * @driver: driver being registered
 756  *
 757  * Registers a driver with the ACPI bus.  Searches the namespace for all
 758  * devices that match the driver's criteria and binds.  Returns zero for
 759  * success or a negative error status for failure.
 760  */
 761 int acpi_bus_register_driver(struct acpi_driver *driver)
 762 {
 763         int ret;
 764
 765         if (acpi_disabled)
 766                 return -ENODEV;
 767         driver->drv.name = driver->name;
 768         driver->drv.bus = &acpi_bus_type;
 769         driver->drv.owner = driver->owner;
 770
 771         ret = driver_register(&driver->drv);
 772         return ret;
 773 }
 774
 775 EXPORT_SYMBOL(acpi_bus_register_driver);
 776
 777 /**
 778  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 779  * @driver: driver to unregister
 780  *
 781  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 782  * devices that match the driver's criteria and unbinds.
 783  */
 784 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 785 {
 786         driver_unregister(&driver->drv);
 787 }
 788
 789 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 790
 791 /* --------------------------------------------------------------------------
 792                                  Device Enumeration
 793    -------------------------------------------------------------------------- */
 794 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 795 {
 796         acpi_status status;
 797         int ret;
 798         struct acpi_device *device;
 799
 800         /*
 801          * Fixed hardware devices do not appear in the namespace and do not
 802          * have handles, but we fabricate acpi_devices for them, so we have
 803          * to deal with them specially.
 804          */
 805         if (handle == NULL)
 806                 return acpi_root;
 807
 808         do {
 809                 status = acpi_get_parent(handle, &handle);
 810                 if (status == AE_NULL_ENTRY)
 811                         return NULL;
 812                 if (ACPI_FAILURE(status))
 813                         return acpi_root;
 814
 815                 ret = acpi_bus_get_device(handle, &device);
 816                 if (ret == 0)
 817                         return device;
 818         } while (1);
 819 }
 820
 821 acpi_status
 822 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 823 {
 824         acpi_status status;
 825         acpi_handle tmp;
 826         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 827         union acpi_object *obj;
 828
 829         status = acpi_get_handle(handle, "_EJD", &tmp);
 830         if (ACPI_FAILURE(status))
 831                 return status;
 832
 833         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 834         if (ACPI_SUCCESS(status)) {
 835                 obj = buffer.pointer;
 836                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 837                                          ejd);
 838                 kfree(buffer.pointer);
 839         }
 840         return status;
 841 }
 842 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 843
 844 void acpi_bus_data_handler(acpi_handle handle, void *context)
 845 {
 846
 847         /* TBD */
 848
 849         return;
 850 }
 851
 852 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 853 {
 854         device->performance.state = ACPI_STATE_UNKNOWN;
 855         return 0;
 856 }
 857
 858 static acpi_status
 859 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 860                                              struct acpi_device_wakeup *wakeup)
 861 {
 862         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 863         union acpi_object *package = NULL;
 864         union acpi_object *element = NULL;
 865         acpi_status status;
 866         int i = 0;
 867
 868         if (!wakeup)
 869                 return AE_BAD_PARAMETER;
 870
 871         /* _PRW */
 872         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 873         if (ACPI_FAILURE(status)) {
 874                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 875                 return status;
 876         }
 877
 878         package = (union acpi_object *)buffer.pointer;
 879
 880         if (!package || (package->package.count < 2)) {
 881                 status = AE_BAD_DATA;
 882                 goto out;
 883         }
 884
 885         element = &(package->package.elements[0]);
 886         if (!element) {
 887                 status = AE_BAD_DATA;
 888                 goto out;
 889         }
 890         if (element->type == ACPI_TYPE_PACKAGE) {
 891                 if ((element->package.count < 2) ||
 892                     (element->package.elements[0].type !=
 893                      ACPI_TYPE_LOCAL_REFERENCE)
 894                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
 895                         status = AE_BAD_DATA;
 896                         goto out;
 897                 }
 898                 wakeup->gpe_device =
 899                     element->package.elements[0].reference.handle;
 900                 wakeup->gpe_number =
 901                     (u32) element->package.elements[1].integer.value;
 902         } else if (element->type == ACPI_TYPE_INTEGER) {
 903                 wakeup->gpe_device = NULL;
 904                 wakeup->gpe_number = element->integer.value;
 905         } else {
 906                 status = AE_BAD_DATA;
 907                 goto out;
 908         }
 909
 910         element = &(package->package.elements[1]);
 911         if (element->type != ACPI_TYPE_INTEGER) {
 912                 status = AE_BAD_DATA;
 913                 goto out;
 914         }
 915         wakeup->sleep_state = element->integer.value;
 916
 917         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 918                 status = AE_NO_MEMORY;
 919                 goto out;
 920         }
 921         wakeup->resources.count = package->package.count - 2;
 922         for (i = 0; i < wakeup->resources.count; i++) {
 923                 element = &(package->package.elements[i + 2]);
 924                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
 925                         status = AE_BAD_DATA;
 926                         goto out;
 927                 }
 928
 929                 wakeup->resources.handles[i] = element->reference.handle;
 930         }
 931
 932         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
 933
 934  out:
 935         kfree(buffer.pointer);
 936
 937         return status;
 938 }
 939
 940 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
 941 {
 942         struct acpi_device_id button_device_ids[] = {
 943                 {"PNP0C0C", 0},
 944                 {"PNP0C0D", 0},
 945                 {"PNP0C0E", 0},
 946                 {"", 0},
 947         };
 948         acpi_status status;
 949         acpi_event_status event_status;
 950
 951         device->wakeup.flags.notifier_present = 0;
 952
 953         /* Power button, Lid switch always enable wakeup */
 954         if (!acpi_match_device_ids(device, button_device_ids)) {
 955                 device->wakeup.flags.run_wake = 1;
 956                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 957                         /* Do not use Lid/sleep button for S5 wakeup */
 958                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
 959                                 device->wakeup.sleep_state = ACPI_STATE_S4;
 960                 }
 961                 device_set_wakeup_capable(&device->dev, true);
 962                 return;
 963         }
 964
 965         status = acpi_get_gpe_status(device->wakeup.gpe_device,
 966                                         device->wakeup.gpe_number,
 967                                                 &event_status);
 968         if (status == AE_OK)
 969                 device->wakeup.flags.run_wake =
 970                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
 971 }
 972
 973 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 974 {
 975         acpi_handle temp;
 976         acpi_status status = 0;
 977         int psw_error;
 978
 979         /* Presence of _PRW indicates wake capable */
 980         status = acpi_get_handle(device->handle, "_PRW", &temp);
 981         if (ACPI_FAILURE(status))
 982                 return;
 983
 984         status = acpi_bus_extract_wakeup_device_power_package(device->handle,
 985                                                               &device->wakeup);
 986         if (ACPI_FAILURE(status)) {
 987                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 988                 return;
 989         }
 990
 991         device->wakeup.flags.valid = 1;
 992         device->wakeup.prepare_count = 0;
 993         acpi_bus_set_run_wake_flags(device);
 994         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 995          * system for the ACPI device with the _PRW object.
 996          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 997          * So it is necessary to call _DSW object first. Only when it is not
 998          * present will the _PSW object used.
 999          */
1000         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
1001         if (psw_error)
1002                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1003                                 "error in _DSW or _PSW evaluation\n"));
1004 }
1005
1006 static void acpi_bus_add_power_resource(acpi_handle handle);
1007
1008 static int acpi_bus_get_power_flags(struct acpi_device *device)
1009 {
1010         acpi_status status = 0;
1011         acpi_handle handle = NULL;
1012         u32 i = 0;
1013
1014
1015         /*
1016          * Power Management Flags
1017          */
1018         status = acpi_get_handle(device->handle, "_PSC", &handle);
1019         if (ACPI_SUCCESS(status))
1020                 device->power.flags.explicit_get = 1;
1021         status = acpi_get_handle(device->handle, "_IRC", &handle);
1022         if (ACPI_SUCCESS(status))
1023                 device->power.flags.inrush_current = 1;
1024
1025         /*
1026          * Enumerate supported power management states
1027          */
1028         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1029                 struct acpi_device_power_state *ps = &device->power.states[i];
1030                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
1031
1032                 /* Evaluate "_PRx" to se if power resources are referenced */
1033                 acpi_evaluate_reference(device->handle, object_name, NULL,
1034                                         &ps->resources);
1035                 if (ps->resources.count) {
1036                         int j;
1037
1038                         device->power.flags.power_resources = 1;
1039                         for (j = 0; j < ps->resources.count; j++)
1040                                 acpi_bus_add_power_resource(ps->resources.handles[j]);
1041                 }
1042
1043                 /* Evaluate "_PSx" to see if we can do explicit sets */
1044                 object_name[2] = 'S';
1045                 status = acpi_get_handle(device->handle, object_name, &handle);
1046                 if (ACPI_SUCCESS(status))
1047                         ps->flags.explicit_set = 1;
1048
1049                 /*
1050                  * State is valid if there are means to put the device into it.
1051                  * D3hot is only valid if _PR3 present.
1052                  */
1053                 if (ps->resources.count ||
1054                     (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
1055                         ps->flags.valid = 1;
1056                         ps->flags.os_accessible = 1;
1057                 }
1058
1059                 ps->power = -1; /* Unknown - driver assigned */
1060                 ps->latency = -1;       /* Unknown - driver assigned */
1061         }
1062
1063         /* Set defaults for D0 and D3 states (always valid) */
1064         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1065         device->power.states[ACPI_STATE_D0].power = 100;
1066         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1067         device->power.states[ACPI_STATE_D3].power = 0;
1068
1069         /* Set D3cold's explicit_set flag if _PS3 exists. */
1070         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1071                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1072
1073         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1074         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1075                         device->power.flags.power_resources)
1076                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1077
1078         acpi_bus_init_power(device);
1079
1080         return 0;
1081 }
1082
1083 static int acpi_bus_get_flags(struct acpi_device *device)
1084 {
1085         acpi_status status = AE_OK;
1086         acpi_handle temp = NULL;
1087
1088
1089         /* Presence of _STA indicates 'dynamic_status' */
1090         status = acpi_get_handle(device->handle, "_STA", &temp);
1091         if (ACPI_SUCCESS(status))
1092                 device->flags.dynamic_status = 1;
1093
1094         /* Presence of _RMV indicates 'removable' */
1095         status = acpi_get_handle(device->handle, "_RMV", &temp);
1096         if (ACPI_SUCCESS(status))
1097                 device->flags.removable = 1;
1098
1099         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1100         status = acpi_get_handle(device->handle, "_EJD", &temp);
1101         if (ACPI_SUCCESS(status))
1102                 device->flags.ejectable = 1;
1103         else {
1104                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1105                 if (ACPI_SUCCESS(status))
1106                         device->flags.ejectable = 1;
1107         }
1108
1109         /* Power resources cannot be power manageable. */
1110         if (device->device_type == ACPI_BUS_TYPE_POWER)
1111                 return 0;
1112
1113         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1114         status = acpi_get_handle(device->handle, "_PS0", &temp);
1115         if (ACPI_FAILURE(status))
1116                 status = acpi_get_handle(device->handle, "_PR0", &temp);
1117         if (ACPI_SUCCESS(status))
1118                 device->flags.power_manageable = 1;
1119
1120         /* TBD: Performance management */
1121
1122         return 0;
1123 }
1124
1125 static void acpi_device_get_busid(struct acpi_device *device)
1126 {
1127         char bus_id[5] = { '?', 0 };
1128         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1129         int i = 0;
1130
1131         /*
1132          * Bus ID
1133          * ------
1134          * The device's Bus ID is simply the object name.
1135          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1136          */
1137         if (ACPI_IS_ROOT_DEVICE(device)) {
1138                 strcpy(device->pnp.bus_id, "ACPI");
1139                 return;
1140         }
1141
1142         switch (device->device_type) {
1143         case ACPI_BUS_TYPE_POWER_BUTTON:
1144                 strcpy(device->pnp.bus_id, "PWRF");
1145                 break;
1146         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1147                 strcpy(device->pnp.bus_id, "SLPF");
1148                 break;
1149         default:
1150                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1151                 /* Clean up trailing underscores (if any) */
1152                 for (i = 3; i > 1; i--) {
1153                         if (bus_id[i] == '_')
1154                                 bus_id[i] = '\0';
1155                         else
1156                                 break;
1157                 }
1158                 strcpy(device->pnp.bus_id, bus_id);
1159                 break;
1160         }
1161 }
1162
1163 /*
1164  * acpi_bay_match - see if a device is an ejectable driver bay
1165  *
1166  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1167  * then we can safely call it an ejectable drive bay
1168  */
1169 static int acpi_bay_match(struct acpi_device *device){
1170         acpi_status status;
1171         acpi_handle handle;
1172         acpi_handle tmp;
1173         acpi_handle phandle;
1174
1175         handle = device->handle;
1176
1177         status = acpi_get_handle(handle, "_EJ0", &tmp);
1178         if (ACPI_FAILURE(status))
1179                 return -ENODEV;
1180
1181         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1182                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1183                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1184                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1185                 return 0;
1186
1187         if (acpi_get_parent(handle, &phandle))
1188                 return -ENODEV;
1189
1190         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1191                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1192                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1193                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1194                 return 0;
1195
1196         return -ENODEV;
1197 }
1198
1199 /*
1200  * acpi_dock_match - see if a device has a _DCK method
1201  */
1202 static int acpi_dock_match(struct acpi_device *device)
1203 {
1204         acpi_handle tmp;
1205         return acpi_get_handle(device->handle, "_DCK", &tmp);
1206 }
1207
1208 const char *acpi_device_hid(struct acpi_device *device)
1209 {
1210         struct acpi_hardware_id *hid;
1211
1212         if (list_empty(&device->pnp.ids))
1213                 return dummy_hid;
1214
1215         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1216         return hid->id;
1217 }
1218 EXPORT_SYMBOL(acpi_device_hid);
1219
1220 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1221 {
1222         struct acpi_hardware_id *id;
1223
1224         id = kmalloc(sizeof(*id), GFP_KERNEL);
1225         if (!id)
1226                 return;
1227
1228         id->id = kstrdup(dev_id, GFP_KERNEL);
1229         if (!id->id) {
1230                 kfree(id);
1231                 return;
1232         }
1233
1234         list_add_tail(&id->list, &device->pnp.ids);
1235 }
1236
1237 /*
1238  * Old IBM workstations have a DSDT bug wherein the SMBus object
1239  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1240  * prefix.  Work around this.
1241  */
1242 static int acpi_ibm_smbus_match(struct acpi_device *device)
1243 {
1244         acpi_handle h_dummy;
1245         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1246         int result;
1247
1248         if (!dmi_name_in_vendors("IBM"))
1249                 return -ENODEV;
1250
1251         /* Look for SMBS object */
1252         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1253         if (result)
1254                 return result;
1255
1256         if (strcmp("SMBS", path.pointer)) {
1257                 result = -ENODEV;
1258                 goto out;
1259         }
1260
1261         /* Does it have the necessary (but misnamed) methods? */
1262         result = -ENODEV;
1263         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1264             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1265             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1266                 result = 0;
1267 out:
1268         kfree(path.pointer);
1269         return result;
1270 }
1271
1272 static void acpi_device_set_id(struct acpi_device *device)
1273 {
1274         acpi_status status;
1275         struct acpi_device_info *info;
1276         struct acpi_pnp_device_id_list *cid_list;
1277         int i;
1278
1279         switch (device->device_type) {
1280         case ACPI_BUS_TYPE_DEVICE:
1281                 if (ACPI_IS_ROOT_DEVICE(device)) {
1282                         acpi_add_id(device, ACPI_SYSTEM_HID);
1283                         break;
1284                 }
1285
1286                 status = acpi_get_object_info(device->handle, &info);
1287                 if (ACPI_FAILURE(status)) {
1288                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1289                         return;
1290                 }
1291
1292                 if (info->valid & ACPI_VALID_HID)
1293                         acpi_add_id(device, info->hardware_id.string);
1294                 if (info->valid & ACPI_VALID_CID) {
1295                         cid_list = &info->compatible_id_list;
1296                         for (i = 0; i < cid_list->count; i++)
1297                                 acpi_add_id(device, cid_list->ids[i].string);
1298                 }
1299                 if (info->valid & ACPI_VALID_ADR) {
1300                         device->pnp.bus_address = info->address;
1301                         device->flags.bus_address = 1;
1302                 }
1303                 if (info->valid & ACPI_VALID_UID)
1304                         device->pnp.unique_id = kstrdup(info->unique_id.string,
1305                                                         GFP_KERNEL);
1306
1307                 kfree(info);
1308
1309                 /*
1310                  * Some devices don't reliably have _HIDs & _CIDs, so add
1311                  * synthetic HIDs to make sure drivers can find them.
1312                  */
1313                 if (acpi_is_video_device(device))
1314                         acpi_add_id(device, ACPI_VIDEO_HID);
1315                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1316                         acpi_add_id(device, ACPI_BAY_HID);
1317                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1318                         acpi_add_id(device, ACPI_DOCK_HID);
1319                 else if (!acpi_ibm_smbus_match(device))
1320                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1321                 else if (list_empty(&device->pnp.ids) &&
1322                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1323                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1324                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1325                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1326                 }
1327
1328                 break;
1329         case ACPI_BUS_TYPE_POWER:
1330                 acpi_add_id(device, ACPI_POWER_HID);
1331                 break;
1332         case ACPI_BUS_TYPE_PROCESSOR:
1333                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1334                 break;
1335         case ACPI_BUS_TYPE_THERMAL:
1336                 acpi_add_id(device, ACPI_THERMAL_HID);
1337                 break;
1338         case ACPI_BUS_TYPE_POWER_BUTTON:
1339                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1340                 break;
1341         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1342                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1343                 break;
1344         }
1345 }
1346
1347 static int acpi_device_set_context(struct acpi_device *device)
1348 {
1349         acpi_status status;
1350
1351         /*
1352          * Context
1353          * -------
1354          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1355          * resolutions from handle->device very efficient.  Fixed hardware
1356          * devices have no handles, so we skip them.
1357          */
1358         if (!device->handle)
1359                 return 0;
1360
1361         status = acpi_attach_data(device->handle,
1362                                   acpi_bus_data_handler, device);
1363         if (ACPI_SUCCESS(status))
1364                 return 0;
1365
1366         printk(KERN_ERR PREFIX "Error attaching device data\n");
1367         return -ENODEV;
1368 }
1369
1370 static int acpi_add_single_object(struct acpi_device **child,
1371                                   acpi_handle handle, int type,
1372                                   unsigned long long sta, bool match_driver)
1373 {
1374         int result;
1375         struct acpi_device *device;
1376         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1377
1378         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1379         if (!device) {
1380                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1381                 return -ENOMEM;
1382         }
1383
1384         INIT_LIST_HEAD(&device->pnp.ids);
1385         device->device_type = type;
1386         device->handle = handle;
1387         device->parent = acpi_bus_get_parent(handle);
1388         STRUCT_TO_INT(device->status) = sta;
1389
1390         acpi_device_get_busid(device);
1391
1392         /*
1393          * Flags
1394          * -----
1395          * Note that we only look for object handles -- cannot evaluate objects
1396          * until we know the device is present and properly initialized.
1397          */
1398         result = acpi_bus_get_flags(device);
1399         if (result)
1400                 goto end;
1401
1402         /*
1403          * Initialize Device
1404          * -----------------
1405          * TBD: Synch with Core's enumeration/initialization process.
1406          */
1407         acpi_device_set_id(device);
1408
1409         /*
1410          * Power Management
1411          * ----------------
1412          */
1413         if (device->flags.power_manageable) {
1414                 result = acpi_bus_get_power_flags(device);
1415                 if (result)
1416                         goto end;
1417         }
1418
1419         /*
1420          * Wakeup device management
1421          *-----------------------
1422          */
1423         acpi_bus_get_wakeup_device_flags(device);
1424
1425         /*
1426          * Performance Management
1427          * ----------------------
1428          */
1429         if (device->flags.performance_manageable) {
1430                 result = acpi_bus_get_perf_flags(device);
1431                 if (result)
1432                         goto end;
1433         }
1434
1435         if ((result = acpi_device_set_context(device)))
1436                 goto end;
1437
1438         device->flags.match_driver = match_driver;
1439         result = acpi_device_register(device);
1440
1441 end:
1442         if (!result) {
1443                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1444                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1445                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1446                          (char *) buffer.pointer,
1447                          device->parent ? dev_name(&device->parent->dev) :
1448                                           "(null)"));
1449                 kfree(buffer.pointer);
1450                 *child = device;
1451         } else
1452                 acpi_device_release(&device->dev);
1453
1454         return result;
1455 }
1456
1457 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1458                           ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
1459
1460 static void acpi_bus_add_power_resource(acpi_handle handle)
1461 {
1462         struct acpi_device *device = NULL;
1463
1464         acpi_bus_get_device(handle, &device);
1465         if (!device)
1466                 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1467                                         ACPI_STA_DEFAULT, true);
1468 }
1469
1470 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1471                                     unsigned long long *sta)
1472 {
1473         acpi_status status;
1474         acpi_object_type acpi_type;
1475
1476         status = acpi_get_type(handle, &acpi_type);
1477         if (ACPI_FAILURE(status))
1478                 return -ENODEV;
1479
1480         switch (acpi_type) {
1481         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1482         case ACPI_TYPE_DEVICE:
1483                 *type = ACPI_BUS_TYPE_DEVICE;
1484                 status = acpi_bus_get_status_handle(handle, sta);
1485                 if (ACPI_FAILURE(status))
1486                         return -ENODEV;
1487                 break;
1488         case ACPI_TYPE_PROCESSOR:
1489                 *type = ACPI_BUS_TYPE_PROCESSOR;
1490                 status = acpi_bus_get_status_handle(handle, sta);
1491                 if (ACPI_FAILURE(status))
1492                         return -ENODEV;
1493                 break;
1494         case ACPI_TYPE_THERMAL:
1495                 *type = ACPI_BUS_TYPE_THERMAL;
1496                 *sta = ACPI_STA_DEFAULT;
1497                 break;
1498         case ACPI_TYPE_POWER:
1499                 *type = ACPI_BUS_TYPE_POWER;
1500                 *sta = ACPI_STA_DEFAULT;
1501                 break;
1502         default:
1503                 return -ENODEV;
1504         }
1505
1506         return 0;
1507 }
1508
1509 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1510                                       void *not_used, void **return_value)
1511 {
1512         struct acpi_device *device = NULL;
1513         int type;
1514         unsigned long long sta;
1515         acpi_status status;
1516         int result;
1517
1518         acpi_bus_get_device(handle, &device);
1519         if (device)
1520                 goto out;
1521
1522         result = acpi_bus_type_and_status(handle, &type, &sta);
1523         if (result)
1524                 return AE_OK;
1525
1526         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1527             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1528                 struct acpi_device_wakeup wakeup;
1529                 acpi_handle temp;
1530
1531                 status = acpi_get_handle(handle, "_PRW", &temp);
1532                 if (ACPI_SUCCESS(status))
1533                         acpi_bus_extract_wakeup_device_power_package(handle,
1534                                                                      &wakeup);
1535                 return AE_CTRL_DEPTH;
1536         }
1537
1538         acpi_add_single_object(&device, handle, type, sta,
1539                                type == ACPI_BUS_TYPE_POWER);
1540         if (!device)
1541                 return AE_CTRL_DEPTH;
1542
1543         device->flags.match_driver = true;
1544
1545  out:
1546         if (!*return_value)
1547                 *return_value = device;
1548
1549         return AE_OK;
1550 }
1551
1552 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1553                                           void *not_used, void **ret_not_used)
1554 {
1555         acpi_status status = AE_OK;
1556         struct acpi_device *device;
1557         unsigned long long sta_not_used;
1558         int type_not_used;
1559
1560         /*
1561          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1562          * namespace walks prematurely.
1563          */
1564         if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
1565                 return AE_OK;
1566
1567         if (acpi_bus_get_device(handle, &device))
1568                 return AE_CTRL_DEPTH;
1569
1570         if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
1571                 /* This is a known good platform device. */
1572                 acpi_create_platform_device(device);
1573         } else if (device_attach(&device->dev) < 0) {
1574                 status = AE_CTRL_DEPTH;
1575         }
1576         return status;
1577 }
1578
1579 /**
1580  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1581  * @handle: Root of the namespace scope to scan.
1582  *
1583  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1584  * found devices.
1585  *
1586  * If no devices were found, -ENODEV is returned, but it does not mean that
1587  * there has been a real error.  There just have been no suitable ACPI objects
1588  * in the table trunk from which the kernel could create a device and add an
1589  * appropriate driver.
1590  */
1591 int acpi_bus_scan(acpi_handle handle)
1592 {
1593         void *device = NULL;
1594
1595         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1596                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1597                                     acpi_bus_check_add, NULL, NULL, &device);
1598
1599         if (!device)
1600                 return -ENODEV;
1601
1602         if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1603                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1604                                     acpi_bus_device_attach, NULL, NULL, NULL);
1605
1606         return 0;
1607 }
1608 EXPORT_SYMBOL(acpi_bus_scan);
1609
1610 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1611                                           void *not_used, void **ret_not_used)
1612 {
1613         struct acpi_device *device = NULL;
1614
1615         if (!acpi_bus_get_device(handle, &device)) {
1616                 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1617                 device_release_driver(&device->dev);
1618         }
1619         return AE_OK;
1620 }
1621
1622 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1623                                    void *not_used, void **ret_not_used)
1624 {
1625         struct acpi_device *device = NULL;
1626
1627         if (!acpi_bus_get_device(handle, &device))
1628                 acpi_device_unregister(device);
1629
1630         return AE_OK;
1631 }
1632
1633 int acpi_bus_trim(struct acpi_device *start)
1634 {
1635         /*
1636          * Execute acpi_bus_device_detach() as a post-order callback to detach
1637          * all ACPI drivers from the device nodes being removed.
1638          */
1639         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1640                             acpi_bus_device_detach, NULL, NULL);
1641         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1642         /*
1643          * Execute acpi_bus_remove() as a post-order callback to remove device
1644          * nodes in the given namespace scope.
1645          */
1646         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1647                             acpi_bus_remove, NULL, NULL);
1648         acpi_bus_remove(start->handle, 0, NULL, NULL);
1649         return 0;
1650 }
1651 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1652
1653 static int acpi_bus_scan_fixed(void)
1654 {
1655         int result = 0;
1656         struct acpi_device *device = NULL;
1657
1658         /*
1659          * Enumerate all fixed-feature devices.
1660          */
1661         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1662                 result = acpi_add_single_object(&device, NULL,
1663                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1664                                                 ACPI_STA_DEFAULT, true);
1665                 device_init_wakeup(&device->dev, true);
1666         }
1667
1668         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1669                 result = acpi_add_single_object(&device, NULL,
1670                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1671                                                 ACPI_STA_DEFAULT, true);
1672         }
1673
1674         return result;
1675 }
1676
1677 int __init acpi_scan_init(void)
1678 {
1679         int result;
1680
1681         result = bus_register(&acpi_bus_type);
1682         if (result) {
1683                 /* We don't want to quit even if we failed to add suspend/resume */
1684                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1685         }
1686
1687         acpi_power_init();
1688         acpi_pci_root_init();
1689
1690         /*
1691          * Enumerate devices in the ACPI namespace.
1692          */
1693         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1694         if (result)
1695                 return result;
1696
1697         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1698         if (result)
1699                 return result;
1700
1701         result = acpi_bus_scan_fixed();
1702         if (result) {
1703                 acpi_device_unregister(acpi_root);
1704                 return result;
1705         }
1706
1707         acpi_update_all_gpes();
1708         return 0;
1709 }