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 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         kfree(device->pnp.unique_id);
 476 }
 477
 478 static void acpi_free_power_resources_lists(struct acpi_device *device)
 479 {
 480         int i;
 481
 482         if (device->wakeup.flags.valid)
 483                 acpi_power_resources_list_free(&device->wakeup.resources);
 484
 485         if (!device->flags.power_manageable)
 486                 return;
 487
 488         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 489                 struct acpi_device_power_state *ps = &device->power.states[i];
 490                 acpi_power_resources_list_free(&ps->resources);
 491         }
 492 }
 493
 494 static void acpi_device_release(struct device *dev)
 495 {
 496         struct acpi_device *acpi_dev = to_acpi_device(dev);
 497
 498         acpi_free_ids(acpi_dev);
 499         acpi_free_power_resources_lists(acpi_dev);
 500         kfree(acpi_dev);
 501 }
 502
 503 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 504 {
 505         struct acpi_device *acpi_dev = to_acpi_device(dev);
 506         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 507
 508         return acpi_dev->flags.match_driver
 509                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 510 }
 511
 512 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 513 {
 514         struct acpi_device *acpi_dev = to_acpi_device(dev);
 515         int len;
 516
 517         if (list_empty(&acpi_dev->pnp.ids))
 518                 return 0;
 519
 520         if (add_uevent_var(env, "MODALIAS="))
 521                 return -ENOMEM;
 522         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 523                               sizeof(env->buf) - env->buflen);
 524         if (len >= (sizeof(env->buf) - env->buflen))
 525                 return -ENOMEM;
 526         env->buflen += len;
 527         return 0;
 528 }
 529
 530 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 531 {
 532         struct acpi_device *device = data;
 533
 534         device->driver->ops.notify(device, event);
 535 }
 536
 537 static acpi_status acpi_device_notify_fixed(void *data)
 538 {
 539         struct acpi_device *device = data;
 540
 541         /* Fixed hardware devices have no handles */
 542         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 543         return AE_OK;
 544 }
 545
 546 static int acpi_device_install_notify_handler(struct acpi_device *device)
 547 {
 548         acpi_status status;
 549
 550         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 551                 status =
 552                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 553                                                      acpi_device_notify_fixed,
 554                                                      device);
 555         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 556                 status =
 557                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 558                                                      acpi_device_notify_fixed,
 559                                                      device);
 560         else
 561                 status = acpi_install_notify_handler(device->handle,
 562                                                      ACPI_DEVICE_NOTIFY,
 563                                                      acpi_device_notify,
 564                                                      device);
 565
 566         if (ACPI_FAILURE(status))
 567                 return -EINVAL;
 568         return 0;
 569 }
 570
 571 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 572 {
 573         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 574                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 575                                                 acpi_device_notify_fixed);
 576         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 577                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 578                                                 acpi_device_notify_fixed);
 579         else
 580                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 581                                            acpi_device_notify);
 582 }
 583
 584 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 585 static int acpi_device_probe(struct device * dev)
 586 {
 587         struct acpi_device *acpi_dev = to_acpi_device(dev);
 588         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 589         int ret;
 590
 591         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 592         if (!ret) {
 593                 if (acpi_drv->ops.notify) {
 594                         ret = acpi_device_install_notify_handler(acpi_dev);
 595                         if (ret) {
 596                                 if (acpi_drv->ops.remove)
 597                                         acpi_drv->ops.remove(acpi_dev,
 598                                                      acpi_dev->removal_type);
 599                                 return ret;
 600                         }
 601                 }
 602
 603                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 604                         "Found driver [%s] for device [%s]\n",
 605                         acpi_drv->name, acpi_dev->pnp.bus_id));
 606                 get_device(dev);
 607         }
 608         return ret;
 609 }
 610
 611 static int acpi_device_remove(struct device * dev)
 612 {
 613         struct acpi_device *acpi_dev = to_acpi_device(dev);
 614         struct acpi_driver *acpi_drv = acpi_dev->driver;
 615
 616         if (acpi_drv) {
 617                 if (acpi_drv->ops.notify)
 618                         acpi_device_remove_notify_handler(acpi_dev);
 619                 if (acpi_drv->ops.remove)
 620                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 621         }
 622         acpi_dev->driver = NULL;
 623         acpi_dev->driver_data = NULL;
 624
 625         put_device(dev);
 626         return 0;
 627 }
 628
 629 struct bus_type acpi_bus_type = {
 630         .name           = "acpi",
 631         .match          = acpi_bus_match,
 632         .probe          = acpi_device_probe,
 633         .remove         = acpi_device_remove,
 634         .uevent         = acpi_device_uevent,
 635 };
 636
 637 int acpi_device_register(struct acpi_device *device,
 638                          void (*release)(struct device *))
 639 {
 640         int result;
 641         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 642         int found = 0;
 643
 644         if (device->handle) {
 645                 acpi_status status;
 646
 647                 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
 648                                           device);
 649                 if (ACPI_FAILURE(status)) {
 650                         acpi_handle_err(device->handle,
 651                                         "Unable to attach device data\n");
 652                         return -ENODEV;
 653                 }
 654         }
 655
 656         /*
 657          * Linkage
 658          * -------
 659          * Link this device to its parent and siblings.
 660          */
 661         INIT_LIST_HEAD(&device->children);
 662         INIT_LIST_HEAD(&device->node);
 663         INIT_LIST_HEAD(&device->wakeup_list);
 664         INIT_LIST_HEAD(&device->physical_node_list);
 665         mutex_init(&device->physical_node_lock);
 666         INIT_LIST_HEAD(&device->power_dependent);
 667
 668         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 669         if (!new_bus_id) {
 670                 pr_err(PREFIX "Memory allocation error\n");
 671                 result = -ENOMEM;
 672                 goto err_detach;
 673         }
 674
 675         mutex_lock(&acpi_device_lock);
 676         /*
 677          * Find suitable bus_id and instance number in acpi_bus_id_list
 678          * If failed, create one and link it into acpi_bus_id_list
 679          */
 680         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 681                 if (!strcmp(acpi_device_bus_id->bus_id,
 682                             acpi_device_hid(device))) {
 683                         acpi_device_bus_id->instance_no++;
 684                         found = 1;
 685                         kfree(new_bus_id);
 686                         break;
 687                 }
 688         }
 689         if (!found) {
 690                 acpi_device_bus_id = new_bus_id;
 691                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 692                 acpi_device_bus_id->instance_no = 0;
 693                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 694         }
 695         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 696
 697         if (device->parent)
 698                 list_add_tail(&device->node, &device->parent->children);
 699
 700         if (device->wakeup.flags.valid)
 701                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 702         mutex_unlock(&acpi_device_lock);
 703
 704         if (device->parent)
 705                 device->dev.parent = &device->parent->dev;
 706         device->dev.bus = &acpi_bus_type;
 707         device->dev.release = release;
 708         result = device_register(&device->dev);
 709         if (result) {
 710                 dev_err(&device->dev, "Error registering device\n");
 711                 goto err;
 712         }
 713
 714         result = acpi_device_setup_files(device);
 715         if (result)
 716                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 717                        dev_name(&device->dev));
 718
 719         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 720         return 0;
 721
 722  err:
 723         mutex_lock(&acpi_device_lock);
 724         if (device->parent)
 725                 list_del(&device->node);
 726         list_del(&device->wakeup_list);
 727         mutex_unlock(&acpi_device_lock);
 728
 729  err_detach:
 730         acpi_detach_data(device->handle, acpi_bus_data_handler);
 731         return result;
 732 }
 733
 734 static void acpi_device_unregister(struct acpi_device *device)
 735 {
 736         mutex_lock(&acpi_device_lock);
 737         if (device->parent)
 738                 list_del(&device->node);
 739
 740         list_del(&device->wakeup_list);
 741         mutex_unlock(&acpi_device_lock);
 742
 743         acpi_detach_data(device->handle, acpi_bus_data_handler);
 744
 745         acpi_power_add_remove_device(device, false);
 746         acpi_device_remove_files(device);
 747         device_unregister(&device->dev);
 748         /*
 749          * Drop the reference counts of all power resources the device depends
 750          * on and turn off the ones that have no more references.
 751          */
 752         acpi_power_transition(device, ACPI_STATE_D3_COLD);
 753 }
 754
 755 /* --------------------------------------------------------------------------
 756                                  Driver Management
 757    -------------------------------------------------------------------------- */
 758 /**
 759  * acpi_bus_driver_init - add a device to a driver
 760  * @device: the device to add and initialize
 761  * @driver: driver for the device
 762  *
 763  * Used to initialize a device via its device driver.  Called whenever a
 764  * driver is bound to a device.  Invokes the driver's add() ops.
 765  */
 766 static int
 767 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 768 {
 769         int result = 0;
 770
 771         if (!device || !driver)
 772                 return -EINVAL;
 773
 774         if (!driver->ops.add)
 775                 return -ENOSYS;
 776
 777         result = driver->ops.add(device);
 778         if (result) {
 779                 device->driver = NULL;
 780                 device->driver_data = NULL;
 781                 return result;
 782         }
 783
 784         device->driver = driver;
 785
 786         /*
 787          * TBD - Configuration Management: Assign resources to device based
 788          * upon possible configuration and currently allocated resources.
 789          */
 790
 791         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 792                           "Driver successfully bound to device\n"));
 793         return 0;
 794 }
 795
 796 /**
 797  * acpi_bus_register_driver - register a driver with the ACPI bus
 798  * @driver: driver being registered
 799  *
 800  * Registers a driver with the ACPI bus.  Searches the namespace for all
 801  * devices that match the driver's criteria and binds.  Returns zero for
 802  * success or a negative error status for failure.
 803  */
 804 int acpi_bus_register_driver(struct acpi_driver *driver)
 805 {
 806         int ret;
 807
 808         if (acpi_disabled)
 809                 return -ENODEV;
 810         driver->drv.name = driver->name;
 811         driver->drv.bus = &acpi_bus_type;
 812         driver->drv.owner = driver->owner;
 813
 814         ret = driver_register(&driver->drv);
 815         return ret;
 816 }
 817
 818 EXPORT_SYMBOL(acpi_bus_register_driver);
 819
 820 /**
 821  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 822  * @driver: driver to unregister
 823  *
 824  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 825  * devices that match the driver's criteria and unbinds.
 826  */
 827 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 828 {
 829         driver_unregister(&driver->drv);
 830 }
 831
 832 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 833
 834 /* --------------------------------------------------------------------------
 835                                  Device Enumeration
 836    -------------------------------------------------------------------------- */
 837 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 838 {
 839         acpi_status status;
 840         int ret;
 841         struct acpi_device *device;
 842
 843         /*
 844          * Fixed hardware devices do not appear in the namespace and do not
 845          * have handles, but we fabricate acpi_devices for them, so we have
 846          * to deal with them specially.
 847          */
 848         if (handle == NULL)
 849                 return acpi_root;
 850
 851         do {
 852                 status = acpi_get_parent(handle, &handle);
 853                 if (status == AE_NULL_ENTRY)
 854                         return NULL;
 855                 if (ACPI_FAILURE(status))
 856                         return acpi_root;
 857
 858                 ret = acpi_bus_get_device(handle, &device);
 859                 if (ret == 0)
 860                         return device;
 861         } while (1);
 862 }
 863
 864 acpi_status
 865 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 866 {
 867         acpi_status status;
 868         acpi_handle tmp;
 869         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 870         union acpi_object *obj;
 871
 872         status = acpi_get_handle(handle, "_EJD", &tmp);
 873         if (ACPI_FAILURE(status))
 874                 return status;
 875
 876         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 877         if (ACPI_SUCCESS(status)) {
 878                 obj = buffer.pointer;
 879                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 880                                          ejd);
 881                 kfree(buffer.pointer);
 882         }
 883         return status;
 884 }
 885 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 886
 887 void acpi_bus_data_handler(acpi_handle handle, void *context)
 888 {
 889
 890         /* TBD */
 891
 892         return;
 893 }
 894
 895 static acpi_status
 896 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 897                                              struct acpi_device_wakeup *wakeup)
 898 {
 899         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 900         union acpi_object *package = NULL;
 901         union acpi_object *element = NULL;
 902         acpi_status status;
 903         int i = 0;
 904
 905         if (!wakeup)
 906                 return AE_BAD_PARAMETER;
 907
 908         INIT_LIST_HEAD(&wakeup->resources);
 909
 910         /* _PRW */
 911         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 912         if (ACPI_FAILURE(status)) {
 913                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 914                 return status;
 915         }
 916
 917         package = (union acpi_object *)buffer.pointer;
 918
 919         if (!package || (package->package.count < 2)) {
 920                 status = AE_BAD_DATA;
 921                 goto out;
 922         }
 923
 924         element = &(package->package.elements[0]);
 925         if (!element) {
 926                 status = AE_BAD_DATA;
 927                 goto out;
 928         }
 929         if (element->type == ACPI_TYPE_PACKAGE) {
 930                 if ((element->package.count < 2) ||
 931                     (element->package.elements[0].type !=
 932                      ACPI_TYPE_LOCAL_REFERENCE)
 933                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
 934                         status = AE_BAD_DATA;
 935                         goto out;
 936                 }
 937                 wakeup->gpe_device =
 938                     element->package.elements[0].reference.handle;
 939                 wakeup->gpe_number =
 940                     (u32) element->package.elements[1].integer.value;
 941         } else if (element->type == ACPI_TYPE_INTEGER) {
 942                 wakeup->gpe_device = NULL;
 943                 wakeup->gpe_number = element->integer.value;
 944         } else {
 945                 status = AE_BAD_DATA;
 946                 goto out;
 947         }
 948
 949         element = &(package->package.elements[1]);
 950         if (element->type != ACPI_TYPE_INTEGER) {
 951                 status = AE_BAD_DATA;
 952                 goto out;
 953         }
 954         wakeup->sleep_state = element->integer.value;
 955
 956         for (i = 2; i < package->package.count; i++) {
 957                 acpi_handle rhandle;
 958
 959                 element = &(package->package.elements[i]);
 960                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
 961                         status = AE_BAD_DATA;
 962                         goto out;
 963                 }
 964                 rhandle = element->reference.handle;
 965                 acpi_add_power_resource(rhandle);
 966                 acpi_power_resources_list_add(rhandle, &wakeup->resources);
 967         }
 968
 969         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
 970
 971  out:
 972         kfree(buffer.pointer);
 973
 974         return status;
 975 }
 976
 977 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
 978 {
 979         struct acpi_device_id button_device_ids[] = {
 980                 {"PNP0C0C", 0},
 981                 {"PNP0C0D", 0},
 982                 {"PNP0C0E", 0},
 983                 {"", 0},
 984         };
 985         acpi_status status;
 986         acpi_event_status event_status;
 987
 988         device->wakeup.flags.notifier_present = 0;
 989
 990         /* Power button, Lid switch always enable wakeup */
 991         if (!acpi_match_device_ids(device, button_device_ids)) {
 992                 device->wakeup.flags.run_wake = 1;
 993                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 994                         /* Do not use Lid/sleep button for S5 wakeup */
 995                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
 996                                 device->wakeup.sleep_state = ACPI_STATE_S4;
 997                 }
 998                 device_set_wakeup_capable(&device->dev, true);
 999                 return;
1000         }
1001
1002         status = acpi_get_gpe_status(device->wakeup.gpe_device,
1003                                         device->wakeup.gpe_number,
1004                                                 &event_status);
1005         if (status == AE_OK)
1006                 device->wakeup.flags.run_wake =
1007                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1008 }
1009
1010 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1011 {
1012         acpi_handle temp;
1013         acpi_status status = 0;
1014         int psw_error;
1015
1016         /* Presence of _PRW indicates wake capable */
1017         status = acpi_get_handle(device->handle, "_PRW", &temp);
1018         if (ACPI_FAILURE(status))
1019                 return;
1020
1021         status = acpi_bus_extract_wakeup_device_power_package(device->handle,
1022                                                               &device->wakeup);
1023         if (ACPI_FAILURE(status)) {
1024                 acpi_power_resources_list_free(&device->wakeup.resources);
1025                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
1026                 return;
1027         }
1028
1029         device->wakeup.flags.valid = 1;
1030         device->wakeup.prepare_count = 0;
1031         acpi_bus_set_run_wake_flags(device);
1032         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1033          * system for the ACPI device with the _PRW object.
1034          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1035          * So it is necessary to call _DSW object first. Only when it is not
1036          * present will the _PSW object used.
1037          */
1038         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
1039         if (psw_error)
1040                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1041                                 "error in _DSW or _PSW evaluation\n"));
1042 }
1043
1044 static void acpi_bus_get_power_flags(struct acpi_device *device)
1045 {
1046         acpi_status status = 0;
1047         acpi_handle handle = NULL;
1048         u32 i = 0;
1049
1050         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1051         status = acpi_get_handle(device->handle, "_PS0", &handle);
1052         if (ACPI_FAILURE(status)) {
1053                 status = acpi_get_handle(device->handle, "_PR0", &handle);
1054                 if (ACPI_FAILURE(status))
1055                         return;
1056         }
1057
1058         device->flags.power_manageable = 1;
1059
1060         /*
1061          * Power Management Flags
1062          */
1063         status = acpi_get_handle(device->handle, "_PSC", &handle);
1064         if (ACPI_SUCCESS(status))
1065                 device->power.flags.explicit_get = 1;
1066         status = acpi_get_handle(device->handle, "_IRC", &handle);
1067         if (ACPI_SUCCESS(status))
1068                 device->power.flags.inrush_current = 1;
1069
1070         /*
1071          * Enumerate supported power management states
1072          */
1073         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1074                 struct acpi_device_power_state *ps = &device->power.states[i];
1075                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
1076                 struct acpi_handle_list resources;
1077
1078                 INIT_LIST_HEAD(&ps->resources);
1079                 /* Evaluate "_PRx" to se if power resources are referenced */
1080                 acpi_evaluate_reference(device->handle, object_name, NULL,
1081                                         &resources);
1082                 if (resources.count) {
1083                         int j;
1084
1085                         device->power.flags.power_resources = 1;
1086                         for (j = 0; j < resources.count; j++) {
1087                                 acpi_handle rhandle = resources.handles[j];
1088
1089                                 acpi_add_power_resource(rhandle);
1090                                 acpi_power_resources_list_add(rhandle,
1091                                                               &ps->resources);
1092                         }
1093                 }
1094
1095                 /* Evaluate "_PSx" to see if we can do explicit sets */
1096                 object_name[2] = 'S';
1097                 status = acpi_get_handle(device->handle, object_name, &handle);
1098                 if (ACPI_SUCCESS(status))
1099                         ps->flags.explicit_set = 1;
1100
1101                 /*
1102                  * State is valid if there are means to put the device into it.
1103                  * D3hot is only valid if _PR3 present.
1104                  */
1105                 if (resources.count ||
1106                     (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
1107                         ps->flags.valid = 1;
1108                         ps->flags.os_accessible = 1;
1109                 }
1110
1111                 ps->power = -1; /* Unknown - driver assigned */
1112                 ps->latency = -1;       /* Unknown - driver assigned */
1113         }
1114
1115         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1116
1117         /* Set defaults for D0 and D3 states (always valid) */
1118         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1119         device->power.states[ACPI_STATE_D0].power = 100;
1120         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1121         device->power.states[ACPI_STATE_D3].power = 0;
1122
1123         /* Set D3cold's explicit_set flag if _PS3 exists. */
1124         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1125                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1126
1127         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1128         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1129                         device->power.flags.power_resources)
1130                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1131
1132         acpi_bus_init_power(device);
1133 }
1134
1135 static void acpi_bus_get_flags(struct acpi_device *device)
1136 {
1137         acpi_status status = AE_OK;
1138         acpi_handle temp = NULL;
1139
1140         /* Presence of _STA indicates 'dynamic_status' */
1141         status = acpi_get_handle(device->handle, "_STA", &temp);
1142         if (ACPI_SUCCESS(status))
1143                 device->flags.dynamic_status = 1;
1144
1145         /* Presence of _RMV indicates 'removable' */
1146         status = acpi_get_handle(device->handle, "_RMV", &temp);
1147         if (ACPI_SUCCESS(status))
1148                 device->flags.removable = 1;
1149
1150         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1151         status = acpi_get_handle(device->handle, "_EJD", &temp);
1152         if (ACPI_SUCCESS(status))
1153                 device->flags.ejectable = 1;
1154         else {
1155                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1156                 if (ACPI_SUCCESS(status))
1157                         device->flags.ejectable = 1;
1158         }
1159 }
1160
1161 static void acpi_device_get_busid(struct acpi_device *device)
1162 {
1163         char bus_id[5] = { '?', 0 };
1164         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1165         int i = 0;
1166
1167         /*
1168          * Bus ID
1169          * ------
1170          * The device's Bus ID is simply the object name.
1171          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1172          */
1173         if (ACPI_IS_ROOT_DEVICE(device)) {
1174                 strcpy(device->pnp.bus_id, "ACPI");
1175                 return;
1176         }
1177
1178         switch (device->device_type) {
1179         case ACPI_BUS_TYPE_POWER_BUTTON:
1180                 strcpy(device->pnp.bus_id, "PWRF");
1181                 break;
1182         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1183                 strcpy(device->pnp.bus_id, "SLPF");
1184                 break;
1185         default:
1186                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1187                 /* Clean up trailing underscores (if any) */
1188                 for (i = 3; i > 1; i--) {
1189                         if (bus_id[i] == '_')
1190                                 bus_id[i] = '\0';
1191                         else
1192                                 break;
1193                 }
1194                 strcpy(device->pnp.bus_id, bus_id);
1195                 break;
1196         }
1197 }
1198
1199 /*
1200  * acpi_bay_match - see if a device is an ejectable driver bay
1201  *
1202  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1203  * then we can safely call it an ejectable drive bay
1204  */
1205 static int acpi_bay_match(struct acpi_device *device){
1206         acpi_status status;
1207         acpi_handle handle;
1208         acpi_handle tmp;
1209         acpi_handle phandle;
1210
1211         handle = device->handle;
1212
1213         status = acpi_get_handle(handle, "_EJ0", &tmp);
1214         if (ACPI_FAILURE(status))
1215                 return -ENODEV;
1216
1217         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1218                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1219                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1220                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1221                 return 0;
1222
1223         if (acpi_get_parent(handle, &phandle))
1224                 return -ENODEV;
1225
1226         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1227                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1228                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1229                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1230                 return 0;
1231
1232         return -ENODEV;
1233 }
1234
1235 /*
1236  * acpi_dock_match - see if a device has a _DCK method
1237  */
1238 static int acpi_dock_match(struct acpi_device *device)
1239 {
1240         acpi_handle tmp;
1241         return acpi_get_handle(device->handle, "_DCK", &tmp);
1242 }
1243
1244 const char *acpi_device_hid(struct acpi_device *device)
1245 {
1246         struct acpi_hardware_id *hid;
1247
1248         if (list_empty(&device->pnp.ids))
1249                 return dummy_hid;
1250
1251         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1252         return hid->id;
1253 }
1254 EXPORT_SYMBOL(acpi_device_hid);
1255
1256 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1257 {
1258         struct acpi_hardware_id *id;
1259
1260         id = kmalloc(sizeof(*id), GFP_KERNEL);
1261         if (!id)
1262                 return;
1263
1264         id->id = kstrdup(dev_id, GFP_KERNEL);
1265         if (!id->id) {
1266                 kfree(id);
1267                 return;
1268         }
1269
1270         list_add_tail(&id->list, &device->pnp.ids);
1271 }
1272
1273 /*
1274  * Old IBM workstations have a DSDT bug wherein the SMBus object
1275  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1276  * prefix.  Work around this.
1277  */
1278 static int acpi_ibm_smbus_match(struct acpi_device *device)
1279 {
1280         acpi_handle h_dummy;
1281         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1282         int result;
1283
1284         if (!dmi_name_in_vendors("IBM"))
1285                 return -ENODEV;
1286
1287         /* Look for SMBS object */
1288         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1289         if (result)
1290                 return result;
1291
1292         if (strcmp("SMBS", path.pointer)) {
1293                 result = -ENODEV;
1294                 goto out;
1295         }
1296
1297         /* Does it have the necessary (but misnamed) methods? */
1298         result = -ENODEV;
1299         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1300             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1301             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1302                 result = 0;
1303 out:
1304         kfree(path.pointer);
1305         return result;
1306 }
1307
1308 static void acpi_device_set_id(struct acpi_device *device)
1309 {
1310         acpi_status status;
1311         struct acpi_device_info *info;
1312         struct acpi_pnp_device_id_list *cid_list;
1313         int i;
1314
1315         switch (device->device_type) {
1316         case ACPI_BUS_TYPE_DEVICE:
1317                 if (ACPI_IS_ROOT_DEVICE(device)) {
1318                         acpi_add_id(device, ACPI_SYSTEM_HID);
1319                         break;
1320                 }
1321
1322                 status = acpi_get_object_info(device->handle, &info);
1323                 if (ACPI_FAILURE(status)) {
1324                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1325                         return;
1326                 }
1327
1328                 if (info->valid & ACPI_VALID_HID)
1329                         acpi_add_id(device, info->hardware_id.string);
1330                 if (info->valid & ACPI_VALID_CID) {
1331                         cid_list = &info->compatible_id_list;
1332                         for (i = 0; i < cid_list->count; i++)
1333                                 acpi_add_id(device, cid_list->ids[i].string);
1334                 }
1335                 if (info->valid & ACPI_VALID_ADR) {
1336                         device->pnp.bus_address = info->address;
1337                         device->flags.bus_address = 1;
1338                 }
1339                 if (info->valid & ACPI_VALID_UID)
1340                         device->pnp.unique_id = kstrdup(info->unique_id.string,
1341                                                         GFP_KERNEL);
1342
1343                 kfree(info);
1344
1345                 /*
1346                  * Some devices don't reliably have _HIDs & _CIDs, so add
1347                  * synthetic HIDs to make sure drivers can find them.
1348                  */
1349                 if (acpi_is_video_device(device))
1350                         acpi_add_id(device, ACPI_VIDEO_HID);
1351                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1352                         acpi_add_id(device, ACPI_BAY_HID);
1353                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1354                         acpi_add_id(device, ACPI_DOCK_HID);
1355                 else if (!acpi_ibm_smbus_match(device))
1356                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1357                 else if (list_empty(&device->pnp.ids) &&
1358                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1359                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1360                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1361                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1362                 }
1363
1364                 break;
1365         case ACPI_BUS_TYPE_POWER:
1366                 acpi_add_id(device, ACPI_POWER_HID);
1367                 break;
1368         case ACPI_BUS_TYPE_PROCESSOR:
1369                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1370                 break;
1371         case ACPI_BUS_TYPE_THERMAL:
1372                 acpi_add_id(device, ACPI_THERMAL_HID);
1373                 break;
1374         case ACPI_BUS_TYPE_POWER_BUTTON:
1375                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1376                 break;
1377         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1378                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1379                 break;
1380         }
1381 }
1382
1383 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1384                              int type, unsigned long long sta)
1385 {
1386         INIT_LIST_HEAD(&device->pnp.ids);
1387         device->device_type = type;
1388         device->handle = handle;
1389         device->parent = acpi_bus_get_parent(handle);
1390         STRUCT_TO_INT(device->status) = sta;
1391         acpi_device_get_busid(device);
1392         acpi_device_set_id(device);
1393         acpi_bus_get_flags(device);
1394 }
1395
1396 static int acpi_add_single_object(struct acpi_device **child,
1397                                   acpi_handle handle, int type,
1398                                   unsigned long long sta, bool match_driver)
1399 {
1400         int result;
1401         struct acpi_device *device;
1402         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1403
1404         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1405         if (!device) {
1406                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1407                 return -ENOMEM;
1408         }
1409
1410         acpi_init_device_object(device, handle, type, sta);
1411         acpi_bus_get_power_flags(device);
1412         acpi_bus_get_wakeup_device_flags(device);
1413
1414         device->flags.match_driver = match_driver;
1415         result = acpi_device_register(device, acpi_device_release);
1416         if (result) {
1417                 acpi_device_release(&device->dev);
1418                 return result;
1419         }
1420
1421         acpi_power_add_remove_device(device, true);
1422         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1423         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1424                 dev_name(&device->dev), (char *) buffer.pointer,
1425                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1426         kfree(buffer.pointer);
1427         *child = device;
1428         return 0;
1429 }
1430
1431 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1432                                     unsigned long long *sta)
1433 {
1434         acpi_status status;
1435         acpi_object_type acpi_type;
1436
1437         status = acpi_get_type(handle, &acpi_type);
1438         if (ACPI_FAILURE(status))
1439                 return -ENODEV;
1440
1441         switch (acpi_type) {
1442         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1443         case ACPI_TYPE_DEVICE:
1444                 *type = ACPI_BUS_TYPE_DEVICE;
1445                 status = acpi_bus_get_status_handle(handle, sta);
1446                 if (ACPI_FAILURE(status))
1447                         return -ENODEV;
1448                 break;
1449         case ACPI_TYPE_PROCESSOR:
1450                 *type = ACPI_BUS_TYPE_PROCESSOR;
1451                 status = acpi_bus_get_status_handle(handle, sta);
1452                 if (ACPI_FAILURE(status))
1453                         return -ENODEV;
1454                 break;
1455         case ACPI_TYPE_THERMAL:
1456                 *type = ACPI_BUS_TYPE_THERMAL;
1457                 *sta = ACPI_STA_DEFAULT;
1458                 break;
1459         case ACPI_TYPE_POWER:
1460                 *type = ACPI_BUS_TYPE_POWER;
1461                 *sta = ACPI_STA_DEFAULT;
1462                 break;
1463         default:
1464                 return -ENODEV;
1465         }
1466
1467         return 0;
1468 }
1469
1470 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1471                                       void *not_used, void **return_value)
1472 {
1473         struct acpi_device *device = NULL;
1474         int type;
1475         unsigned long long sta;
1476         acpi_status status;
1477         int result;
1478
1479         acpi_bus_get_device(handle, &device);
1480         if (device)
1481                 goto out;
1482
1483         result = acpi_bus_type_and_status(handle, &type, &sta);
1484         if (result)
1485                 return AE_OK;
1486
1487         if (type == ACPI_BUS_TYPE_POWER) {
1488                 acpi_add_power_resource(handle);
1489                 return AE_OK;
1490         }
1491
1492         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1493             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1494                 struct acpi_device_wakeup wakeup;
1495                 acpi_handle temp;
1496
1497                 status = acpi_get_handle(handle, "_PRW", &temp);
1498                 if (ACPI_SUCCESS(status)) {
1499                         acpi_bus_extract_wakeup_device_power_package(handle,
1500                                                                      &wakeup);
1501                         acpi_power_resources_list_free(&wakeup.resources);
1502                 }
1503                 return AE_CTRL_DEPTH;
1504         }
1505
1506         acpi_add_single_object(&device, handle, type, sta, false);
1507         if (!device)
1508                 return AE_CTRL_DEPTH;
1509
1510         device->flags.match_driver = true;
1511
1512  out:
1513         if (!*return_value)
1514                 *return_value = device;
1515
1516         return AE_OK;
1517 }
1518
1519 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1520                                           void *not_used, void **ret_not_used)
1521 {
1522         acpi_status status = AE_OK;
1523         struct acpi_device *device;
1524         unsigned long long sta_not_used;
1525         int type_not_used;
1526
1527         /*
1528          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1529          * namespace walks prematurely.
1530          */
1531         if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
1532                 return AE_OK;
1533
1534         if (acpi_bus_get_device(handle, &device))
1535                 return AE_CTRL_DEPTH;
1536
1537         if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
1538                 /* This is a known good platform device. */
1539                 acpi_create_platform_device(device);
1540         } else if (device_attach(&device->dev) < 0) {
1541                 status = AE_CTRL_DEPTH;
1542         }
1543         return status;
1544 }
1545
1546 static int acpi_bus_scan(acpi_handle handle)
1547 {
1548         void *device = NULL;
1549
1550         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1551                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1552                                     acpi_bus_check_add, NULL, NULL, &device);
1553
1554         if (!device)
1555                 return -ENODEV;
1556
1557         if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1558                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1559                                     acpi_bus_device_attach, NULL, NULL, NULL);
1560
1561         return 0;
1562 }
1563
1564 /**
1565  * acpi_bus_add - Add ACPI device node objects in a given namespace scope.
1566  * @handle: Root of the namespace scope to scan.
1567  *
1568  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1569  * found devices.
1570  *
1571  * If no devices were found, -ENODEV is returned, but it does not mean that
1572  * there has been a real error.  There just have been no suitable ACPI objects
1573  * in the table trunk from which the kernel could create a device and add an
1574  * appropriate driver.
1575  */
1576 int acpi_bus_add(acpi_handle handle)
1577 {
1578         int err;
1579
1580         err = acpi_bus_scan(handle);
1581         if (err)
1582                 return err;
1583
1584         acpi_update_all_gpes();
1585         return 0;
1586 }
1587 EXPORT_SYMBOL(acpi_bus_add);
1588
1589 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1590                                           void *not_used, void **ret_not_used)
1591 {
1592         struct acpi_device *device = NULL;
1593
1594         if (!acpi_bus_get_device(handle, &device)) {
1595                 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1596                 device_release_driver(&device->dev);
1597         }
1598         return AE_OK;
1599 }
1600
1601 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1602                                    void *not_used, void **ret_not_used)
1603 {
1604         struct acpi_device *device = NULL;
1605
1606         if (!acpi_bus_get_device(handle, &device))
1607                 acpi_device_unregister(device);
1608
1609         return AE_OK;
1610 }
1611
1612 int acpi_bus_trim(struct acpi_device *start)
1613 {
1614         /*
1615          * Execute acpi_bus_device_detach() as a post-order callback to detach
1616          * all ACPI drivers from the device nodes being removed.
1617          */
1618         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1619                             acpi_bus_device_detach, NULL, NULL);
1620         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1621         /*
1622          * Execute acpi_bus_remove() as a post-order callback to remove device
1623          * nodes in the given namespace scope.
1624          */
1625         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1626                             acpi_bus_remove, NULL, NULL);
1627         acpi_bus_remove(start->handle, 0, NULL, NULL);
1628         return 0;
1629 }
1630 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1631
1632 static int acpi_bus_scan_fixed(void)
1633 {
1634         int result = 0;
1635         struct acpi_device *device = NULL;
1636
1637         /*
1638          * Enumerate all fixed-feature devices.
1639          */
1640         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1641                 result = acpi_add_single_object(&device, NULL,
1642                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1643                                                 ACPI_STA_DEFAULT, true);
1644                 device_init_wakeup(&device->dev, true);
1645         }
1646
1647         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1648                 result = acpi_add_single_object(&device, NULL,
1649                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1650                                                 ACPI_STA_DEFAULT, true);
1651         }
1652
1653         return result;
1654 }
1655
1656 int __init acpi_scan_init(void)
1657 {
1658         int result;
1659
1660         result = bus_register(&acpi_bus_type);
1661         if (result) {
1662                 /* We don't want to quit even if we failed to add suspend/resume */
1663                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1664         }
1665
1666         acpi_pci_root_init();
1667
1668         /*
1669          * Enumerate devices in the ACPI namespace.
1670          */
1671         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1672         if (result)
1673                 return result;
1674
1675         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1676         if (!result)
1677                 result = acpi_bus_scan_fixed();
1678
1679         if (result)
1680                 acpi_device_unregister(acpi_root);
1681         else
1682                 acpi_update_all_gpes();
1683
1684         return result;
1685 }