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", ACPI_PLATFORM_CLK },
  42         { "INT33C1", ACPI_PLATFORM_CLK },
  43         { "INT33C2", ACPI_PLATFORM_CLK },
  44         { "INT33C3", ACPI_PLATFORM_CLK },
  45         { "INT33C4", ACPI_PLATFORM_CLK },
  46         { "INT33C5", ACPI_PLATFORM_CLK },
  47         { "INT33C6", ACPI_PLATFORM_CLK },
  48         { "INT33C7", ACPI_PLATFORM_CLK },
  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                                                      acpi_dev->removal_type);
 582                                 return ret;
 583                         }
 584                 }
 585
 586                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 587                         "Found driver [%s] for device [%s]\n",
 588                         acpi_drv->name, acpi_dev->pnp.bus_id));
 589                 get_device(dev);
 590         }
 591         return ret;
 592 }
 593
 594 static int acpi_device_remove(struct device * dev)
 595 {
 596         struct acpi_device *acpi_dev = to_acpi_device(dev);
 597         struct acpi_driver *acpi_drv = acpi_dev->driver;
 598
 599         if (acpi_drv) {
 600                 if (acpi_drv->ops.notify)
 601                         acpi_device_remove_notify_handler(acpi_dev);
 602                 if (acpi_drv->ops.remove)
 603                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 604         }
 605         acpi_dev->driver = NULL;
 606         acpi_dev->driver_data = NULL;
 607
 608         put_device(dev);
 609         return 0;
 610 }
 611
 612 struct bus_type acpi_bus_type = {
 613         .name           = "acpi",
 614         .match          = acpi_bus_match,
 615         .probe          = acpi_device_probe,
 616         .remove         = acpi_device_remove,
 617         .uevent         = acpi_device_uevent,
 618 };
 619
 620 static int acpi_device_register(struct acpi_device *device)
 621 {
 622         int result;
 623         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 624         int found = 0;
 625
 626         /*
 627          * Linkage
 628          * -------
 629          * Link this device to its parent and siblings.
 630          */
 631         INIT_LIST_HEAD(&device->children);
 632         INIT_LIST_HEAD(&device->node);
 633         INIT_LIST_HEAD(&device->wakeup_list);
 634         INIT_LIST_HEAD(&device->physical_node_list);
 635         mutex_init(&device->physical_node_lock);
 636
 637         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 638         if (!new_bus_id) {
 639                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 640                 return -ENOMEM;
 641         }
 642
 643         mutex_lock(&acpi_device_lock);
 644         /*
 645          * Find suitable bus_id and instance number in acpi_bus_id_list
 646          * If failed, create one and link it into acpi_bus_id_list
 647          */
 648         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 649                 if (!strcmp(acpi_device_bus_id->bus_id,
 650                             acpi_device_hid(device))) {
 651                         acpi_device_bus_id->instance_no++;
 652                         found = 1;
 653                         kfree(new_bus_id);
 654                         break;
 655                 }
 656         }
 657         if (!found) {
 658                 acpi_device_bus_id = new_bus_id;
 659                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 660                 acpi_device_bus_id->instance_no = 0;
 661                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 662         }
 663         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 664
 665         if (device->parent)
 666                 list_add_tail(&device->node, &device->parent->children);
 667
 668         if (device->wakeup.flags.valid)
 669                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 670         mutex_unlock(&acpi_device_lock);
 671
 672         if (device->parent)
 673                 device->dev.parent = &device->parent->dev;
 674         device->dev.bus = &acpi_bus_type;
 675         device->dev.release = &acpi_device_release;
 676         result = device_register(&device->dev);
 677         if (result) {
 678                 dev_err(&device->dev, "Error registering device\n");
 679                 goto end;
 680         }
 681
 682         result = acpi_device_setup_files(device);
 683         if (result)
 684                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 685                        dev_name(&device->dev));
 686
 687         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 688         return 0;
 689 end:
 690         mutex_lock(&acpi_device_lock);
 691         if (device->parent)
 692                 list_del(&device->node);
 693         list_del(&device->wakeup_list);
 694         mutex_unlock(&acpi_device_lock);
 695         return result;
 696 }
 697
 698 static void acpi_device_unregister(struct acpi_device *device)
 699 {
 700         mutex_lock(&acpi_device_lock);
 701         if (device->parent)
 702                 list_del(&device->node);
 703
 704         list_del(&device->wakeup_list);
 705         mutex_unlock(&acpi_device_lock);
 706
 707         acpi_detach_data(device->handle, acpi_bus_data_handler);
 708
 709         acpi_device_remove_files(device);
 710         device_unregister(&device->dev);
 711 }
 712
 713 /* --------------------------------------------------------------------------
 714                                  Driver Management
 715    -------------------------------------------------------------------------- */
 716 /**
 717  * acpi_bus_driver_init - add a device to a driver
 718  * @device: the device to add and initialize
 719  * @driver: driver for the device
 720  *
 721  * Used to initialize a device via its device driver.  Called whenever a
 722  * driver is bound to a device.  Invokes the driver's add() ops.
 723  */
 724 static int
 725 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 726 {
 727         int result = 0;
 728
 729         if (!device || !driver)
 730                 return -EINVAL;
 731
 732         if (!driver->ops.add)
 733                 return -ENOSYS;
 734
 735         result = driver->ops.add(device);
 736         if (result) {
 737                 device->driver = NULL;
 738                 device->driver_data = NULL;
 739                 return result;
 740         }
 741
 742         device->driver = driver;
 743
 744         /*
 745          * TBD - Configuration Management: Assign resources to device based
 746          * upon possible configuration and currently allocated resources.
 747          */
 748
 749         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 750                           "Driver successfully bound to device\n"));
 751         return 0;
 752 }
 753
 754 /**
 755  * acpi_bus_register_driver - register a driver with the ACPI bus
 756  * @driver: driver being registered
 757  *
 758  * Registers a driver with the ACPI bus.  Searches the namespace for all
 759  * devices that match the driver's criteria and binds.  Returns zero for
 760  * success or a negative error status for failure.
 761  */
 762 int acpi_bus_register_driver(struct acpi_driver *driver)
 763 {
 764         int ret;
 765
 766         if (acpi_disabled)
 767                 return -ENODEV;
 768         driver->drv.name = driver->name;
 769         driver->drv.bus = &acpi_bus_type;
 770         driver->drv.owner = driver->owner;
 771
 772         ret = driver_register(&driver->drv);
 773         return ret;
 774 }
 775
 776 EXPORT_SYMBOL(acpi_bus_register_driver);
 777
 778 /**
 779  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 780  * @driver: driver to unregister
 781  *
 782  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 783  * devices that match the driver's criteria and unbinds.
 784  */
 785 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 786 {
 787         driver_unregister(&driver->drv);
 788 }
 789
 790 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 791
 792 /* --------------------------------------------------------------------------
 793                                  Device Enumeration
 794    -------------------------------------------------------------------------- */
 795 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 796 {
 797         acpi_status status;
 798         int ret;
 799         struct acpi_device *device;
 800
 801         /*
 802          * Fixed hardware devices do not appear in the namespace and do not
 803          * have handles, but we fabricate acpi_devices for them, so we have
 804          * to deal with them specially.
 805          */
 806         if (handle == NULL)
 807                 return acpi_root;
 808
 809         do {
 810                 status = acpi_get_parent(handle, &handle);
 811                 if (status == AE_NULL_ENTRY)
 812                         return NULL;
 813                 if (ACPI_FAILURE(status))
 814                         return acpi_root;
 815
 816                 ret = acpi_bus_get_device(handle, &device);
 817                 if (ret == 0)
 818                         return device;
 819         } while (1);
 820 }
 821
 822 acpi_status
 823 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 824 {
 825         acpi_status status;
 826         acpi_handle tmp;
 827         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 828         union acpi_object *obj;
 829
 830         status = acpi_get_handle(handle, "_EJD", &tmp);
 831         if (ACPI_FAILURE(status))
 832                 return status;
 833
 834         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 835         if (ACPI_SUCCESS(status)) {
 836                 obj = buffer.pointer;
 837                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 838                                          ejd);
 839                 kfree(buffer.pointer);
 840         }
 841         return status;
 842 }
 843 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 844
 845 void acpi_bus_data_handler(acpi_handle handle, void *context)
 846 {
 847
 848         /* TBD */
 849
 850         return;
 851 }
 852
 853 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 854 {
 855         device->performance.state = ACPI_STATE_UNKNOWN;
 856         return 0;
 857 }
 858
 859 static acpi_status
 860 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 861                                              struct acpi_device_wakeup *wakeup)
 862 {
 863         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 864         union acpi_object *package = NULL;
 865         union acpi_object *element = NULL;
 866         acpi_status status;
 867         int i = 0;
 868
 869         if (!wakeup)
 870                 return AE_BAD_PARAMETER;
 871
 872         /* _PRW */
 873         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 874         if (ACPI_FAILURE(status)) {
 875                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 876                 return status;
 877         }
 878
 879         package = (union acpi_object *)buffer.pointer;
 880
 881         if (!package || (package->package.count < 2)) {
 882                 status = AE_BAD_DATA;
 883                 goto out;
 884         }
 885
 886         element = &(package->package.elements[0]);
 887         if (!element) {
 888                 status = AE_BAD_DATA;
 889                 goto out;
 890         }
 891         if (element->type == ACPI_TYPE_PACKAGE) {
 892                 if ((element->package.count < 2) ||
 893                     (element->package.elements[0].type !=
 894                      ACPI_TYPE_LOCAL_REFERENCE)
 895                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
 896                         status = AE_BAD_DATA;
 897                         goto out;
 898                 }
 899                 wakeup->gpe_device =
 900                     element->package.elements[0].reference.handle;
 901                 wakeup->gpe_number =
 902                     (u32) element->package.elements[1].integer.value;
 903         } else if (element->type == ACPI_TYPE_INTEGER) {
 904                 wakeup->gpe_device = NULL;
 905                 wakeup->gpe_number = element->integer.value;
 906         } else {
 907                 status = AE_BAD_DATA;
 908                 goto out;
 909         }
 910
 911         element = &(package->package.elements[1]);
 912         if (element->type != ACPI_TYPE_INTEGER) {
 913                 status = AE_BAD_DATA;
 914                 goto out;
 915         }
 916         wakeup->sleep_state = element->integer.value;
 917
 918         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 919                 status = AE_NO_MEMORY;
 920                 goto out;
 921         }
 922         wakeup->resources.count = package->package.count - 2;
 923         for (i = 0; i < wakeup->resources.count; i++) {
 924                 element = &(package->package.elements[i + 2]);
 925                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
 926                         status = AE_BAD_DATA;
 927                         goto out;
 928                 }
 929
 930                 wakeup->resources.handles[i] = element->reference.handle;
 931         }
 932
 933         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
 934
 935  out:
 936         kfree(buffer.pointer);
 937
 938         return status;
 939 }
 940
 941 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
 942 {
 943         struct acpi_device_id button_device_ids[] = {
 944                 {"PNP0C0C", 0},
 945                 {"PNP0C0D", 0},
 946                 {"PNP0C0E", 0},
 947                 {"", 0},
 948         };
 949         acpi_status status;
 950         acpi_event_status event_status;
 951
 952         device->wakeup.flags.notifier_present = 0;
 953
 954         /* Power button, Lid switch always enable wakeup */
 955         if (!acpi_match_device_ids(device, button_device_ids)) {
 956                 device->wakeup.flags.run_wake = 1;
 957                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 958                         /* Do not use Lid/sleep button for S5 wakeup */
 959                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
 960                                 device->wakeup.sleep_state = ACPI_STATE_S4;
 961                 }
 962                 device_set_wakeup_capable(&device->dev, true);
 963                 return;
 964         }
 965
 966         status = acpi_get_gpe_status(device->wakeup.gpe_device,
 967                                         device->wakeup.gpe_number,
 968                                                 &event_status);
 969         if (status == AE_OK)
 970                 device->wakeup.flags.run_wake =
 971                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
 972 }
 973
 974 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 975 {
 976         acpi_handle temp;
 977         acpi_status status = 0;
 978         int psw_error;
 979
 980         /* Presence of _PRW indicates wake capable */
 981         status = acpi_get_handle(device->handle, "_PRW", &temp);
 982         if (ACPI_FAILURE(status))
 983                 return;
 984
 985         status = acpi_bus_extract_wakeup_device_power_package(device->handle,
 986                                                               &device->wakeup);
 987         if (ACPI_FAILURE(status)) {
 988                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 989                 return;
 990         }
 991
 992         device->wakeup.flags.valid = 1;
 993         device->wakeup.prepare_count = 0;
 994         acpi_bus_set_run_wake_flags(device);
 995         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 996          * system for the ACPI device with the _PRW object.
 997          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 998          * So it is necessary to call _DSW object first. Only when it is not
 999          * present will the _PSW object used.
1000          */
1001         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
1002         if (psw_error)
1003                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1004                                 "error in _DSW or _PSW evaluation\n"));
1005 }
1006
1007 static void acpi_bus_add_power_resource(acpi_handle handle);
1008
1009 static int acpi_bus_get_power_flags(struct acpi_device *device)
1010 {
1011         acpi_status status = 0;
1012         acpi_handle handle = NULL;
1013         u32 i = 0;
1014
1015
1016         /*
1017          * Power Management Flags
1018          */
1019         status = acpi_get_handle(device->handle, "_PSC", &handle);
1020         if (ACPI_SUCCESS(status))
1021                 device->power.flags.explicit_get = 1;
1022         status = acpi_get_handle(device->handle, "_IRC", &handle);
1023         if (ACPI_SUCCESS(status))
1024                 device->power.flags.inrush_current = 1;
1025
1026         /*
1027          * Enumerate supported power management states
1028          */
1029         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1030                 struct acpi_device_power_state *ps = &device->power.states[i];
1031                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
1032
1033                 /* Evaluate "_PRx" to se if power resources are referenced */
1034                 acpi_evaluate_reference(device->handle, object_name, NULL,
1035                                         &ps->resources);
1036                 if (ps->resources.count) {
1037                         int j;
1038
1039                         device->power.flags.power_resources = 1;
1040                         for (j = 0; j < ps->resources.count; j++)
1041                                 acpi_bus_add_power_resource(ps->resources.handles[j]);
1042                 }
1043
1044                 /* Evaluate "_PSx" to see if we can do explicit sets */
1045                 object_name[2] = 'S';
1046                 status = acpi_get_handle(device->handle, object_name, &handle);
1047                 if (ACPI_SUCCESS(status))
1048                         ps->flags.explicit_set = 1;
1049
1050                 /*
1051                  * State is valid if there are means to put the device into it.
1052                  * D3hot is only valid if _PR3 present.
1053                  */
1054                 if (ps->resources.count ||
1055                     (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
1056                         ps->flags.valid = 1;
1057                         ps->flags.os_accessible = 1;
1058                 }
1059
1060                 ps->power = -1; /* Unknown - driver assigned */
1061                 ps->latency = -1;       /* Unknown - driver assigned */
1062         }
1063
1064         /* Set defaults for D0 and D3 states (always valid) */
1065         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1066         device->power.states[ACPI_STATE_D0].power = 100;
1067         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1068         device->power.states[ACPI_STATE_D3].power = 0;
1069
1070         /* Set D3cold's explicit_set flag if _PS3 exists. */
1071         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1072                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1073
1074         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1075         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1076                         device->power.flags.power_resources)
1077                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1078
1079         acpi_bus_init_power(device);
1080
1081         return 0;
1082 }
1083
1084 static int acpi_bus_get_flags(struct acpi_device *device)
1085 {
1086         acpi_status status = AE_OK;
1087         acpi_handle temp = NULL;
1088
1089
1090         /* Presence of _STA indicates 'dynamic_status' */
1091         status = acpi_get_handle(device->handle, "_STA", &temp);
1092         if (ACPI_SUCCESS(status))
1093                 device->flags.dynamic_status = 1;
1094
1095         /* Presence of _RMV indicates 'removable' */
1096         status = acpi_get_handle(device->handle, "_RMV", &temp);
1097         if (ACPI_SUCCESS(status))
1098                 device->flags.removable = 1;
1099
1100         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1101         status = acpi_get_handle(device->handle, "_EJD", &temp);
1102         if (ACPI_SUCCESS(status))
1103                 device->flags.ejectable = 1;
1104         else {
1105                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1106                 if (ACPI_SUCCESS(status))
1107                         device->flags.ejectable = 1;
1108         }
1109
1110         /* Power resources cannot be power manageable. */
1111         if (device->device_type == ACPI_BUS_TYPE_POWER)
1112                 return 0;
1113
1114         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1115         status = acpi_get_handle(device->handle, "_PS0", &temp);
1116         if (ACPI_FAILURE(status))
1117                 status = acpi_get_handle(device->handle, "_PR0", &temp);
1118         if (ACPI_SUCCESS(status))
1119                 device->flags.power_manageable = 1;
1120
1121         /* TBD: Performance management */
1122
1123         return 0;
1124 }
1125
1126 static void acpi_device_get_busid(struct acpi_device *device)
1127 {
1128         char bus_id[5] = { '?', 0 };
1129         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1130         int i = 0;
1131
1132         /*
1133          * Bus ID
1134          * ------
1135          * The device's Bus ID is simply the object name.
1136          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1137          */
1138         if (ACPI_IS_ROOT_DEVICE(device)) {
1139                 strcpy(device->pnp.bus_id, "ACPI");
1140                 return;
1141         }
1142
1143         switch (device->device_type) {
1144         case ACPI_BUS_TYPE_POWER_BUTTON:
1145                 strcpy(device->pnp.bus_id, "PWRF");
1146                 break;
1147         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1148                 strcpy(device->pnp.bus_id, "SLPF");
1149                 break;
1150         default:
1151                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1152                 /* Clean up trailing underscores (if any) */
1153                 for (i = 3; i > 1; i--) {
1154                         if (bus_id[i] == '_')
1155                                 bus_id[i] = '\0';
1156                         else
1157                                 break;
1158                 }
1159                 strcpy(device->pnp.bus_id, bus_id);
1160                 break;
1161         }
1162 }
1163
1164 /*
1165  * acpi_bay_match - see if a device is an ejectable driver bay
1166  *
1167  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1168  * then we can safely call it an ejectable drive bay
1169  */
1170 static int acpi_bay_match(struct acpi_device *device){
1171         acpi_status status;
1172         acpi_handle handle;
1173         acpi_handle tmp;
1174         acpi_handle phandle;
1175
1176         handle = device->handle;
1177
1178         status = acpi_get_handle(handle, "_EJ0", &tmp);
1179         if (ACPI_FAILURE(status))
1180                 return -ENODEV;
1181
1182         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1183                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1184                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1185                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1186                 return 0;
1187
1188         if (acpi_get_parent(handle, &phandle))
1189                 return -ENODEV;
1190
1191         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1192                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1193                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1194                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1195                 return 0;
1196
1197         return -ENODEV;
1198 }
1199
1200 /*
1201  * acpi_dock_match - see if a device has a _DCK method
1202  */
1203 static int acpi_dock_match(struct acpi_device *device)
1204 {
1205         acpi_handle tmp;
1206         return acpi_get_handle(device->handle, "_DCK", &tmp);
1207 }
1208
1209 const char *acpi_device_hid(struct acpi_device *device)
1210 {
1211         struct acpi_hardware_id *hid;
1212
1213         if (list_empty(&device->pnp.ids))
1214                 return dummy_hid;
1215
1216         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1217         return hid->id;
1218 }
1219 EXPORT_SYMBOL(acpi_device_hid);
1220
1221 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1222 {
1223         struct acpi_hardware_id *id;
1224
1225         id = kmalloc(sizeof(*id), GFP_KERNEL);
1226         if (!id)
1227                 return;
1228
1229         id->id = kstrdup(dev_id, GFP_KERNEL);
1230         if (!id->id) {
1231                 kfree(id);
1232                 return;
1233         }
1234
1235         list_add_tail(&id->list, &device->pnp.ids);
1236 }
1237
1238 /*
1239  * Old IBM workstations have a DSDT bug wherein the SMBus object
1240  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1241  * prefix.  Work around this.
1242  */
1243 static int acpi_ibm_smbus_match(struct acpi_device *device)
1244 {
1245         acpi_handle h_dummy;
1246         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1247         int result;
1248
1249         if (!dmi_name_in_vendors("IBM"))
1250                 return -ENODEV;
1251
1252         /* Look for SMBS object */
1253         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1254         if (result)
1255                 return result;
1256
1257         if (strcmp("SMBS", path.pointer)) {
1258                 result = -ENODEV;
1259                 goto out;
1260         }
1261
1262         /* Does it have the necessary (but misnamed) methods? */
1263         result = -ENODEV;
1264         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1265             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1266             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1267                 result = 0;
1268 out:
1269         kfree(path.pointer);
1270         return result;
1271 }
1272
1273 static void acpi_device_set_id(struct acpi_device *device)
1274 {
1275         acpi_status status;
1276         struct acpi_device_info *info;
1277         struct acpi_pnp_device_id_list *cid_list;
1278         int i;
1279
1280         switch (device->device_type) {
1281         case ACPI_BUS_TYPE_DEVICE:
1282                 if (ACPI_IS_ROOT_DEVICE(device)) {
1283                         acpi_add_id(device, ACPI_SYSTEM_HID);
1284                         break;
1285                 }
1286
1287                 status = acpi_get_object_info(device->handle, &info);
1288                 if (ACPI_FAILURE(status)) {
1289                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1290                         return;
1291                 }
1292
1293                 if (info->valid & ACPI_VALID_HID)
1294                         acpi_add_id(device, info->hardware_id.string);
1295                 if (info->valid & ACPI_VALID_CID) {
1296                         cid_list = &info->compatible_id_list;
1297                         for (i = 0; i < cid_list->count; i++)
1298                                 acpi_add_id(device, cid_list->ids[i].string);
1299                 }
1300                 if (info->valid & ACPI_VALID_ADR) {
1301                         device->pnp.bus_address = info->address;
1302                         device->flags.bus_address = 1;
1303                 }
1304                 if (info->valid & ACPI_VALID_UID)
1305                         device->pnp.unique_id = kstrdup(info->unique_id.string,
1306                                                         GFP_KERNEL);
1307
1308                 kfree(info);
1309
1310                 /*
1311                  * Some devices don't reliably have _HIDs & _CIDs, so add
1312                  * synthetic HIDs to make sure drivers can find them.
1313                  */
1314                 if (acpi_is_video_device(device))
1315                         acpi_add_id(device, ACPI_VIDEO_HID);
1316                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1317                         acpi_add_id(device, ACPI_BAY_HID);
1318                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1319                         acpi_add_id(device, ACPI_DOCK_HID);
1320                 else if (!acpi_ibm_smbus_match(device))
1321                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1322                 else if (list_empty(&device->pnp.ids) &&
1323                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1324                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1325                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1326                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1327                 }
1328
1329                 break;
1330         case ACPI_BUS_TYPE_POWER:
1331                 acpi_add_id(device, ACPI_POWER_HID);
1332                 break;
1333         case ACPI_BUS_TYPE_PROCESSOR:
1334                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1335                 break;
1336         case ACPI_BUS_TYPE_THERMAL:
1337                 acpi_add_id(device, ACPI_THERMAL_HID);
1338                 break;
1339         case ACPI_BUS_TYPE_POWER_BUTTON:
1340                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1341                 break;
1342         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1343                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1344                 break;
1345         }
1346 }
1347
1348 static int acpi_device_set_context(struct acpi_device *device)
1349 {
1350         acpi_status status;
1351
1352         /*
1353          * Context
1354          * -------
1355          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1356          * resolutions from handle->device very efficient.  Fixed hardware
1357          * devices have no handles, so we skip them.
1358          */
1359         if (!device->handle)
1360                 return 0;
1361
1362         status = acpi_attach_data(device->handle,
1363                                   acpi_bus_data_handler, device);
1364         if (ACPI_SUCCESS(status))
1365                 return 0;
1366
1367         printk(KERN_ERR PREFIX "Error attaching device data\n");
1368         return -ENODEV;
1369 }
1370
1371 static int acpi_add_single_object(struct acpi_device **child,
1372                                   acpi_handle handle, int type,
1373                                   unsigned long long sta, bool match_driver)
1374 {
1375         int result;
1376         struct acpi_device *device;
1377         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1378
1379         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1380         if (!device) {
1381                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1382                 return -ENOMEM;
1383         }
1384
1385         INIT_LIST_HEAD(&device->pnp.ids);
1386         device->device_type = type;
1387         device->handle = handle;
1388         device->parent = acpi_bus_get_parent(handle);
1389         STRUCT_TO_INT(device->status) = sta;
1390
1391         acpi_device_get_busid(device);
1392
1393         /*
1394          * Flags
1395          * -----
1396          * Note that we only look for object handles -- cannot evaluate objects
1397          * until we know the device is present and properly initialized.
1398          */
1399         result = acpi_bus_get_flags(device);
1400         if (result)
1401                 goto end;
1402
1403         /*
1404          * Initialize Device
1405          * -----------------
1406          * TBD: Synch with Core's enumeration/initialization process.
1407          */
1408         acpi_device_set_id(device);
1409
1410         /*
1411          * Power Management
1412          * ----------------
1413          */
1414         if (device->flags.power_manageable) {
1415                 result = acpi_bus_get_power_flags(device);
1416                 if (result)
1417                         goto end;
1418         }
1419
1420         /*
1421          * Wakeup device management
1422          *-----------------------
1423          */
1424         acpi_bus_get_wakeup_device_flags(device);
1425
1426         /*
1427          * Performance Management
1428          * ----------------------
1429          */
1430         if (device->flags.performance_manageable) {
1431                 result = acpi_bus_get_perf_flags(device);
1432                 if (result)
1433                         goto end;
1434         }
1435
1436         if ((result = acpi_device_set_context(device)))
1437                 goto end;
1438
1439         device->flags.match_driver = match_driver;
1440         result = acpi_device_register(device);
1441
1442 end:
1443         if (!result) {
1444                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1445                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1446                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1447                          (char *) buffer.pointer,
1448                          device->parent ? dev_name(&device->parent->dev) :
1449                                           "(null)"));
1450                 kfree(buffer.pointer);
1451                 *child = device;
1452         } else
1453                 acpi_device_release(&device->dev);
1454
1455         return result;
1456 }
1457
1458 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1459                           ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
1460
1461 static void acpi_bus_add_power_resource(acpi_handle handle)
1462 {
1463         struct acpi_device *device = NULL;
1464
1465         acpi_bus_get_device(handle, &device);
1466         if (!device)
1467                 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1468                                         ACPI_STA_DEFAULT, true);
1469 }
1470
1471 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1472                                     unsigned long long *sta)
1473 {
1474         acpi_status status;
1475         acpi_object_type acpi_type;
1476
1477         status = acpi_get_type(handle, &acpi_type);
1478         if (ACPI_FAILURE(status))
1479                 return -ENODEV;
1480
1481         switch (acpi_type) {
1482         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1483         case ACPI_TYPE_DEVICE:
1484                 *type = ACPI_BUS_TYPE_DEVICE;
1485                 status = acpi_bus_get_status_handle(handle, sta);
1486                 if (ACPI_FAILURE(status))
1487                         return -ENODEV;
1488                 break;
1489         case ACPI_TYPE_PROCESSOR:
1490                 *type = ACPI_BUS_TYPE_PROCESSOR;
1491                 status = acpi_bus_get_status_handle(handle, sta);
1492                 if (ACPI_FAILURE(status))
1493                         return -ENODEV;
1494                 break;
1495         case ACPI_TYPE_THERMAL:
1496                 *type = ACPI_BUS_TYPE_THERMAL;
1497                 *sta = ACPI_STA_DEFAULT;
1498                 break;
1499         case ACPI_TYPE_POWER:
1500                 *type = ACPI_BUS_TYPE_POWER;
1501                 *sta = ACPI_STA_DEFAULT;
1502                 break;
1503         default:
1504                 return -ENODEV;
1505         }
1506
1507         return 0;
1508 }
1509
1510 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1511                                       void *not_used, void **return_value)
1512 {
1513         struct acpi_device *device = NULL;
1514         int type;
1515         unsigned long long sta;
1516         acpi_status status;
1517         int result;
1518
1519         acpi_bus_get_device(handle, &device);
1520         if (device)
1521                 goto out;
1522
1523         result = acpi_bus_type_and_status(handle, &type, &sta);
1524         if (result)
1525                 return AE_OK;
1526
1527         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1528             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1529                 struct acpi_device_wakeup wakeup;
1530                 acpi_handle temp;
1531
1532                 status = acpi_get_handle(handle, "_PRW", &temp);
1533                 if (ACPI_SUCCESS(status))
1534                         acpi_bus_extract_wakeup_device_power_package(handle,
1535                                                                      &wakeup);
1536                 return AE_CTRL_DEPTH;
1537         }
1538
1539         acpi_add_single_object(&device, handle, type, sta,
1540                                type == ACPI_BUS_TYPE_POWER);
1541         if (!device)
1542                 return AE_CTRL_DEPTH;
1543
1544         device->flags.match_driver = true;
1545
1546  out:
1547         if (!*return_value)
1548                 *return_value = device;
1549
1550         return AE_OK;
1551 }
1552
1553 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1554                                           void *not_used, void **ret_not_used)
1555 {
1556         const struct acpi_device_id *id;
1557         acpi_status status = AE_OK;
1558         struct acpi_device *device;
1559         unsigned long long sta_not_used;
1560         int type_not_used;
1561
1562         /*
1563          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1564          * namespace walks prematurely.
1565          */
1566         if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
1567                 return AE_OK;
1568
1569         if (acpi_bus_get_device(handle, &device))
1570                 return AE_CTRL_DEPTH;
1571
1572         id = __acpi_match_device(device, acpi_platform_device_ids);
1573         if (id) {
1574                 /* This is a known good platform device. */
1575                 acpi_create_platform_device(device, id->driver_data);
1576         } else if (device_attach(&device->dev) < 0) {
1577                 status = AE_CTRL_DEPTH;
1578         }
1579         return status;
1580 }
1581
1582 static int acpi_bus_scan(acpi_handle handle)
1583 {
1584         void *device = NULL;
1585
1586         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1587                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1588                                     acpi_bus_check_add, NULL, NULL, &device);
1589
1590         if (!device)
1591                 return -ENODEV;
1592
1593         if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1594                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1595                                     acpi_bus_device_attach, NULL, NULL, NULL);
1596
1597         return 0;
1598 }
1599
1600 /**
1601  * acpi_bus_add - Add ACPI device node objects in a given namespace scope.
1602  * @handle: Root of the namespace scope to scan.
1603  *
1604  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1605  * found devices.
1606  *
1607  * If no devices were found, -ENODEV is returned, but it does not mean that
1608  * there has been a real error.  There just have been no suitable ACPI objects
1609  * in the table trunk from which the kernel could create a device and add an
1610  * appropriate driver.
1611  */
1612 int acpi_bus_add(acpi_handle handle)
1613 {
1614         int err;
1615
1616         err = acpi_bus_scan(handle);
1617         if (err)
1618                 return err;
1619
1620         acpi_update_all_gpes();
1621         return 0;
1622 }
1623 EXPORT_SYMBOL(acpi_bus_add);
1624
1625 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1626                                           void *not_used, void **ret_not_used)
1627 {
1628         struct acpi_device *device = NULL;
1629
1630         if (!acpi_bus_get_device(handle, &device)) {
1631                 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1632                 device_release_driver(&device->dev);
1633         }
1634         return AE_OK;
1635 }
1636
1637 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1638                                    void *not_used, void **ret_not_used)
1639 {
1640         struct acpi_device *device = NULL;
1641
1642         if (!acpi_bus_get_device(handle, &device))
1643                 acpi_device_unregister(device);
1644
1645         return AE_OK;
1646 }
1647
1648 int acpi_bus_trim(struct acpi_device *start)
1649 {
1650         /*
1651          * Execute acpi_bus_device_detach() as a post-order callback to detach
1652          * all ACPI drivers from the device nodes being removed.
1653          */
1654         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1655                             acpi_bus_device_detach, NULL, NULL);
1656         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1657         /*
1658          * Execute acpi_bus_remove() as a post-order callback to remove device
1659          * nodes in the given namespace scope.
1660          */
1661         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1662                             acpi_bus_remove, NULL, NULL);
1663         acpi_bus_remove(start->handle, 0, NULL, NULL);
1664         return 0;
1665 }
1666 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1667
1668 static int acpi_bus_scan_fixed(void)
1669 {
1670         int result = 0;
1671         struct acpi_device *device = NULL;
1672
1673         /*
1674          * Enumerate all fixed-feature devices.
1675          */
1676         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1677                 result = acpi_add_single_object(&device, NULL,
1678                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1679                                                 ACPI_STA_DEFAULT, true);
1680                 device_init_wakeup(&device->dev, true);
1681         }
1682
1683         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1684                 result = acpi_add_single_object(&device, NULL,
1685                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1686                                                 ACPI_STA_DEFAULT, true);
1687         }
1688
1689         return result;
1690 }
1691
1692 int __init acpi_scan_init(void)
1693 {
1694         int result;
1695
1696         result = bus_register(&acpi_bus_type);
1697         if (result) {
1698                 /* We don't want to quit even if we failed to add suspend/resume */
1699                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1700         }
1701
1702         acpi_power_init();
1703         acpi_pci_root_init();
1704         acpi_csrt_init();
1705
1706         /*
1707          * Enumerate devices in the ACPI namespace.
1708          */
1709         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1710         if (result)
1711                 return result;
1712
1713         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1714         if (!result)
1715                 result = acpi_bus_scan_fixed();
1716
1717         if (result)
1718                 acpi_device_unregister(acpi_root);
1719         else
1720                 acpi_update_all_gpes();
1721
1722         return result;
1723 }