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 real_power_state_show(struct device *dev,
 182                                      struct device_attribute *attr, char *buf)
 183 {
 184         struct acpi_device *adev = to_acpi_device(dev);
 185         int state;
 186         int ret;
 187
 188         ret = acpi_device_get_power(adev, &state);
 189         if (ret)
 190                 return ret;
 191
 192         return sprintf(buf, "%s\n", acpi_power_state_string(state));
 193 }
 194
 195 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 196
 197 static ssize_t power_state_show(struct device *dev,
 198                                 struct device_attribute *attr, char *buf)
 199 {
 200         struct acpi_device *adev = to_acpi_device(dev);
 201
 202         return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 203 }
 204
 205 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 206
 207 static ssize_t
 208 acpi_eject_store(struct device *d, struct device_attribute *attr,
 209                 const char *buf, size_t count)
 210 {
 211         int ret = count;
 212         acpi_status status;
 213         acpi_object_type type = 0;
 214         struct acpi_device *acpi_device = to_acpi_device(d);
 215         struct acpi_eject_event *ej_event;
 216
 217         if ((!count) || (buf[0] != '1')) {
 218                 return -EINVAL;
 219         }
 220 #ifndef FORCE_EJECT
 221         if (acpi_device->driver == NULL) {
 222                 ret = -ENODEV;
 223                 goto err;
 224         }
 225 #endif
 226         status = acpi_get_type(acpi_device->handle, &type);
 227         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 228                 ret = -ENODEV;
 229                 goto err;
 230         }
 231
 232         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 233         if (!ej_event) {
 234                 ret = -ENOMEM;
 235                 goto err;
 236         }
 237
 238         ej_event->device = acpi_device;
 239         if (acpi_device->flags.eject_pending) {
 240                 /* event originated from ACPI eject notification */
 241                 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
 242                 acpi_device->flags.eject_pending = 0;
 243         } else {
 244                 /* event originated from user */
 245                 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
 246                 (void) acpi_evaluate_hotplug_ost(acpi_device->handle,
 247                         ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 248         }
 249
 250         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
 251 err:
 252         return ret;
 253 }
 254
 255 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 256
 257 static ssize_t
 258 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 259         struct acpi_device *acpi_dev = to_acpi_device(dev);
 260
 261         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 262 }
 263 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 264
 265 static ssize_t acpi_device_uid_show(struct device *dev,
 266                                     struct device_attribute *attr, char *buf)
 267 {
 268         struct acpi_device *acpi_dev = to_acpi_device(dev);
 269
 270         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 271 }
 272 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 273
 274 static ssize_t acpi_device_adr_show(struct device *dev,
 275                                     struct device_attribute *attr, char *buf)
 276 {
 277         struct acpi_device *acpi_dev = to_acpi_device(dev);
 278
 279         return sprintf(buf, "0x%08x\n",
 280                        (unsigned int)(acpi_dev->pnp.bus_address));
 281 }
 282 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 283
 284 static ssize_t
 285 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 286         struct acpi_device *acpi_dev = to_acpi_device(dev);
 287         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 288         int result;
 289
 290         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 291         if (result)
 292                 goto end;
 293
 294         result = sprintf(buf, "%s\n", (char*)path.pointer);
 295         kfree(path.pointer);
 296 end:
 297         return result;
 298 }
 299 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 300
 301 /* sysfs file that shows description text from the ACPI _STR method */
 302 static ssize_t description_show(struct device *dev,
 303                                 struct device_attribute *attr,
 304                                 char *buf) {
 305         struct acpi_device *acpi_dev = to_acpi_device(dev);
 306         int result;
 307
 308         if (acpi_dev->pnp.str_obj == NULL)
 309                 return 0;
 310
 311         /*
 312          * The _STR object contains a Unicode identifier for a device.
 313          * We need to convert to utf-8 so it can be displayed.
 314          */
 315         result = utf16s_to_utf8s(
 316                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 317                 acpi_dev->pnp.str_obj->buffer.length,
 318                 UTF16_LITTLE_ENDIAN, buf,
 319                 PAGE_SIZE);
 320
 321         buf[result++] = '\n';
 322
 323         return result;
 324 }
 325 static DEVICE_ATTR(description, 0444, description_show, NULL);
 326
 327 static ssize_t
 328 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 329                      char *buf) {
 330         struct acpi_device *acpi_dev = to_acpi_device(dev);
 331
 332         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 333 }
 334 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 335
 336 static int acpi_device_setup_files(struct acpi_device *dev)
 337 {
 338         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 339         acpi_status status;
 340         acpi_handle temp;
 341         unsigned long long sun;
 342         int result = 0;
 343
 344         /*
 345          * Devices gotten from FADT don't have a "path" attribute
 346          */
 347         if (dev->handle) {
 348                 result = device_create_file(&dev->dev, &dev_attr_path);
 349                 if (result)
 350                         goto end;
 351         }
 352
 353         if (!list_empty(&dev->pnp.ids)) {
 354                 result = device_create_file(&dev->dev, &dev_attr_hid);
 355                 if (result)
 356                         goto end;
 357
 358                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 359                 if (result)
 360                         goto end;
 361         }
 362
 363         /*
 364          * If device has _STR, 'description' file is created
 365          */
 366         status = acpi_get_handle(dev->handle, "_STR", &temp);
 367         if (ACPI_SUCCESS(status)) {
 368                 status = acpi_evaluate_object(dev->handle, "_STR",
 369                                         NULL, &buffer);
 370                 if (ACPI_FAILURE(status))
 371                         buffer.pointer = NULL;
 372                 dev->pnp.str_obj = buffer.pointer;
 373                 result = device_create_file(&dev->dev, &dev_attr_description);
 374                 if (result)
 375                         goto end;
 376         }
 377
 378         if (dev->flags.bus_address)
 379                 result = device_create_file(&dev->dev, &dev_attr_adr);
 380         if (dev->pnp.unique_id)
 381                 result = device_create_file(&dev->dev, &dev_attr_uid);
 382
 383         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 384         if (ACPI_SUCCESS(status)) {
 385                 dev->pnp.sun = (unsigned long)sun;
 386                 result = device_create_file(&dev->dev, &dev_attr_sun);
 387                 if (result)
 388                         goto end;
 389         } else {
 390                 dev->pnp.sun = (unsigned long)-1;
 391         }
 392
 393         /*
 394          * If device has _EJ0, 'eject' file is created that is used to trigger
 395          * hot-removal function from userland.
 396          */
 397         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 398         if (ACPI_SUCCESS(status)) {
 399                 result = device_create_file(&dev->dev, &dev_attr_eject);
 400                 if (result)
 401                         return result;
 402         }
 403
 404         if (dev->flags.power_manageable) {
 405                 result = device_create_file(&dev->dev, &dev_attr_power_state);
 406                 if (result)
 407                         return result;
 408
 409                 if (dev->power.flags.power_resources)
 410                         result = device_create_file(&dev->dev,
 411                                                     &dev_attr_real_power_state);
 412         }
 413
 414 end:
 415         return result;
 416 }
 417
 418 static void acpi_device_remove_files(struct acpi_device *dev)
 419 {
 420         acpi_status status;
 421         acpi_handle temp;
 422
 423         if (dev->flags.power_manageable) {
 424                 device_remove_file(&dev->dev, &dev_attr_power_state);
 425                 if (dev->power.flags.power_resources)
 426                         device_remove_file(&dev->dev,
 427                                            &dev_attr_real_power_state);
 428         }
 429
 430         /*
 431          * If device has _STR, remove 'description' file
 432          */
 433         status = acpi_get_handle(dev->handle, "_STR", &temp);
 434         if (ACPI_SUCCESS(status)) {
 435                 kfree(dev->pnp.str_obj);
 436                 device_remove_file(&dev->dev, &dev_attr_description);
 437         }
 438         /*
 439          * If device has _EJ0, remove 'eject' file.
 440          */
 441         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 442         if (ACPI_SUCCESS(status))
 443                 device_remove_file(&dev->dev, &dev_attr_eject);
 444
 445         status = acpi_get_handle(dev->handle, "_SUN", &temp);
 446         if (ACPI_SUCCESS(status))
 447                 device_remove_file(&dev->dev, &dev_attr_sun);
 448
 449         if (dev->pnp.unique_id)
 450                 device_remove_file(&dev->dev, &dev_attr_uid);
 451         if (dev->flags.bus_address)
 452                 device_remove_file(&dev->dev, &dev_attr_adr);
 453         device_remove_file(&dev->dev, &dev_attr_modalias);
 454         device_remove_file(&dev->dev, &dev_attr_hid);
 455         if (dev->handle)
 456                 device_remove_file(&dev->dev, &dev_attr_path);
 457 }
 458 /* --------------------------------------------------------------------------
 459                         ACPI Bus operations
 460    -------------------------------------------------------------------------- */
 461
 462 static const struct acpi_device_id *__acpi_match_device(
 463         struct acpi_device *device, const struct acpi_device_id *ids)
 464 {
 465         const struct acpi_device_id *id;
 466         struct acpi_hardware_id *hwid;
 467
 468         /*
 469          * If the device is not present, it is unnecessary to load device
 470          * driver for it.
 471          */
 472         if (!device->status.present)
 473                 return NULL;
 474
 475         for (id = ids; id->id[0]; id++)
 476                 list_for_each_entry(hwid, &device->pnp.ids, list)
 477                         if (!strcmp((char *) id->id, hwid->id))
 478                                 return id;
 479
 480         return NULL;
 481 }
 482
 483 /**
 484  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 485  * @ids: Array of struct acpi_device_id object to match against.
 486  * @dev: The device structure to match.
 487  *
 488  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 489  * object for that handle and use that object to match against a given list of
 490  * device IDs.
 491  *
 492  * Return a pointer to the first matching ID on success or %NULL on failure.
 493  */
 494 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 495                                                const struct device *dev)
 496 {
 497         struct acpi_device *adev;
 498
 499         if (!ids || !ACPI_HANDLE(dev)
 500             || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
 501                 return NULL;
 502
 503         return __acpi_match_device(adev, ids);
 504 }
 505 EXPORT_SYMBOL_GPL(acpi_match_device);
 506
 507 int acpi_match_device_ids(struct acpi_device *device,
 508                           const struct acpi_device_id *ids)
 509 {
 510         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 511 }
 512 EXPORT_SYMBOL(acpi_match_device_ids);
 513
 514 void acpi_free_ids(struct acpi_device *device)
 515 {
 516         struct acpi_hardware_id *id, *tmp;
 517
 518         list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
 519                 kfree(id->id);
 520                 kfree(id);
 521         }
 522         kfree(device->pnp.unique_id);
 523 }
 524
 525 static void acpi_free_power_resources_lists(struct acpi_device *device)
 526 {
 527         int i;
 528
 529         if (device->wakeup.flags.valid)
 530                 acpi_power_resources_list_free(&device->wakeup.resources);
 531
 532         if (!device->flags.power_manageable)
 533                 return;
 534
 535         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 536                 struct acpi_device_power_state *ps = &device->power.states[i];
 537                 acpi_power_resources_list_free(&ps->resources);
 538         }
 539 }
 540
 541 static void acpi_device_release(struct device *dev)
 542 {
 543         struct acpi_device *acpi_dev = to_acpi_device(dev);
 544
 545         acpi_free_ids(acpi_dev);
 546         acpi_free_power_resources_lists(acpi_dev);
 547         kfree(acpi_dev);
 548 }
 549
 550 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 551 {
 552         struct acpi_device *acpi_dev = to_acpi_device(dev);
 553         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 554
 555         return acpi_dev->flags.match_driver
 556                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 557 }
 558
 559 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 560 {
 561         struct acpi_device *acpi_dev = to_acpi_device(dev);
 562         int len;
 563
 564         if (list_empty(&acpi_dev->pnp.ids))
 565                 return 0;
 566
 567         if (add_uevent_var(env, "MODALIAS="))
 568                 return -ENOMEM;
 569         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 570                               sizeof(env->buf) - env->buflen);
 571         if (len >= (sizeof(env->buf) - env->buflen))
 572                 return -ENOMEM;
 573         env->buflen += len;
 574         return 0;
 575 }
 576
 577 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 578 {
 579         struct acpi_device *device = data;
 580
 581         device->driver->ops.notify(device, event);
 582 }
 583
 584 static acpi_status acpi_device_notify_fixed(void *data)
 585 {
 586         struct acpi_device *device = data;
 587
 588         /* Fixed hardware devices have no handles */
 589         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 590         return AE_OK;
 591 }
 592
 593 static int acpi_device_install_notify_handler(struct acpi_device *device)
 594 {
 595         acpi_status status;
 596
 597         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 598                 status =
 599                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 600                                                      acpi_device_notify_fixed,
 601                                                      device);
 602         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 603                 status =
 604                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 605                                                      acpi_device_notify_fixed,
 606                                                      device);
 607         else
 608                 status = acpi_install_notify_handler(device->handle,
 609                                                      ACPI_DEVICE_NOTIFY,
 610                                                      acpi_device_notify,
 611                                                      device);
 612
 613         if (ACPI_FAILURE(status))
 614                 return -EINVAL;
 615         return 0;
 616 }
 617
 618 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 619 {
 620         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 621                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 622                                                 acpi_device_notify_fixed);
 623         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 624                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 625                                                 acpi_device_notify_fixed);
 626         else
 627                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 628                                            acpi_device_notify);
 629 }
 630
 631 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 632 static int acpi_device_probe(struct device * dev)
 633 {
 634         struct acpi_device *acpi_dev = to_acpi_device(dev);
 635         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 636         int ret;
 637
 638         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 639         if (!ret) {
 640                 if (acpi_drv->ops.notify) {
 641                         ret = acpi_device_install_notify_handler(acpi_dev);
 642                         if (ret) {
 643                                 if (acpi_drv->ops.remove)
 644                                         acpi_drv->ops.remove(acpi_dev,
 645                                                      acpi_dev->removal_type);
 646                                 return ret;
 647                         }
 648                 }
 649
 650                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 651                         "Found driver [%s] for device [%s]\n",
 652                         acpi_drv->name, acpi_dev->pnp.bus_id));
 653                 get_device(dev);
 654         }
 655         return ret;
 656 }
 657
 658 static int acpi_device_remove(struct device * dev)
 659 {
 660         struct acpi_device *acpi_dev = to_acpi_device(dev);
 661         struct acpi_driver *acpi_drv = acpi_dev->driver;
 662
 663         if (acpi_drv) {
 664                 if (acpi_drv->ops.notify)
 665                         acpi_device_remove_notify_handler(acpi_dev);
 666                 if (acpi_drv->ops.remove)
 667                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 668         }
 669         acpi_dev->driver = NULL;
 670         acpi_dev->driver_data = NULL;
 671
 672         put_device(dev);
 673         return 0;
 674 }
 675
 676 struct bus_type acpi_bus_type = {
 677         .name           = "acpi",
 678         .match          = acpi_bus_match,
 679         .probe          = acpi_device_probe,
 680         .remove         = acpi_device_remove,
 681         .uevent         = acpi_device_uevent,
 682 };
 683
 684 int acpi_device_add(struct acpi_device *device,
 685                     void (*release)(struct device *))
 686 {
 687         int result;
 688         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 689         int found = 0;
 690
 691         if (device->handle) {
 692                 acpi_status status;
 693
 694                 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
 695                                           device);
 696                 if (ACPI_FAILURE(status)) {
 697                         acpi_handle_err(device->handle,
 698                                         "Unable to attach device data\n");
 699                         return -ENODEV;
 700                 }
 701         }
 702
 703         /*
 704          * Linkage
 705          * -------
 706          * Link this device to its parent and siblings.
 707          */
 708         INIT_LIST_HEAD(&device->children);
 709         INIT_LIST_HEAD(&device->node);
 710         INIT_LIST_HEAD(&device->wakeup_list);
 711         INIT_LIST_HEAD(&device->physical_node_list);
 712         mutex_init(&device->physical_node_lock);
 713         INIT_LIST_HEAD(&device->power_dependent);
 714
 715         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 716         if (!new_bus_id) {
 717                 pr_err(PREFIX "Memory allocation error\n");
 718                 result = -ENOMEM;
 719                 goto err_detach;
 720         }
 721
 722         mutex_lock(&acpi_device_lock);
 723         /*
 724          * Find suitable bus_id and instance number in acpi_bus_id_list
 725          * If failed, create one and link it into acpi_bus_id_list
 726          */
 727         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 728                 if (!strcmp(acpi_device_bus_id->bus_id,
 729                             acpi_device_hid(device))) {
 730                         acpi_device_bus_id->instance_no++;
 731                         found = 1;
 732                         kfree(new_bus_id);
 733                         break;
 734                 }
 735         }
 736         if (!found) {
 737                 acpi_device_bus_id = new_bus_id;
 738                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 739                 acpi_device_bus_id->instance_no = 0;
 740                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 741         }
 742         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 743
 744         if (device->parent)
 745                 list_add_tail(&device->node, &device->parent->children);
 746
 747         if (device->wakeup.flags.valid)
 748                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 749         mutex_unlock(&acpi_device_lock);
 750
 751         if (device->parent)
 752                 device->dev.parent = &device->parent->dev;
 753         device->dev.bus = &acpi_bus_type;
 754         device->dev.release = release;
 755         result = device_add(&device->dev);
 756         if (result) {
 757                 dev_err(&device->dev, "Error registering device\n");
 758                 goto err;
 759         }
 760
 761         result = acpi_device_setup_files(device);
 762         if (result)
 763                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 764                        dev_name(&device->dev));
 765
 766         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 767         return 0;
 768
 769  err:
 770         mutex_lock(&acpi_device_lock);
 771         if (device->parent)
 772                 list_del(&device->node);
 773         list_del(&device->wakeup_list);
 774         mutex_unlock(&acpi_device_lock);
 775
 776  err_detach:
 777         acpi_detach_data(device->handle, acpi_bus_data_handler);
 778         return result;
 779 }
 780
 781 static void acpi_device_unregister(struct acpi_device *device)
 782 {
 783         mutex_lock(&acpi_device_lock);
 784         if (device->parent)
 785                 list_del(&device->node);
 786
 787         list_del(&device->wakeup_list);
 788         mutex_unlock(&acpi_device_lock);
 789
 790         acpi_detach_data(device->handle, acpi_bus_data_handler);
 791
 792         acpi_power_add_remove_device(device, false);
 793         acpi_device_remove_files(device);
 794         if (device->remove)
 795                 device->remove(device);
 796
 797         device_del(&device->dev);
 798         /*
 799          * Drop the reference counts of all power resources the device depends
 800          * on and turn off the ones that have no more references.
 801          */
 802         acpi_power_transition(device, ACPI_STATE_D3_COLD);
 803         put_device(&device->dev);
 804 }
 805
 806 /* --------------------------------------------------------------------------
 807                                  Driver Management
 808    -------------------------------------------------------------------------- */
 809 /**
 810  * acpi_bus_driver_init - add a device to a driver
 811  * @device: the device to add and initialize
 812  * @driver: driver for the device
 813  *
 814  * Used to initialize a device via its device driver.  Called whenever a
 815  * driver is bound to a device.  Invokes the driver's add() ops.
 816  */
 817 static int
 818 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 819 {
 820         int result = 0;
 821
 822         if (!device || !driver)
 823                 return -EINVAL;
 824
 825         if (!driver->ops.add)
 826                 return -ENOSYS;
 827
 828         result = driver->ops.add(device);
 829         if (result) {
 830                 device->driver = NULL;
 831                 device->driver_data = NULL;
 832                 return result;
 833         }
 834
 835         device->driver = driver;
 836
 837         /*
 838          * TBD - Configuration Management: Assign resources to device based
 839          * upon possible configuration and currently allocated resources.
 840          */
 841
 842         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 843                           "Driver successfully bound to device\n"));
 844         return 0;
 845 }
 846
 847 /**
 848  * acpi_bus_register_driver - register a driver with the ACPI bus
 849  * @driver: driver being registered
 850  *
 851  * Registers a driver with the ACPI bus.  Searches the namespace for all
 852  * devices that match the driver's criteria and binds.  Returns zero for
 853  * success or a negative error status for failure.
 854  */
 855 int acpi_bus_register_driver(struct acpi_driver *driver)
 856 {
 857         int ret;
 858
 859         if (acpi_disabled)
 860                 return -ENODEV;
 861         driver->drv.name = driver->name;
 862         driver->drv.bus = &acpi_bus_type;
 863         driver->drv.owner = driver->owner;
 864
 865         ret = driver_register(&driver->drv);
 866         return ret;
 867 }
 868
 869 EXPORT_SYMBOL(acpi_bus_register_driver);
 870
 871 /**
 872  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 873  * @driver: driver to unregister
 874  *
 875  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 876  * devices that match the driver's criteria and unbinds.
 877  */
 878 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 879 {
 880         driver_unregister(&driver->drv);
 881 }
 882
 883 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 884
 885 /* --------------------------------------------------------------------------
 886                                  Device Enumeration
 887    -------------------------------------------------------------------------- */
 888 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 889 {
 890         acpi_status status;
 891         int ret;
 892         struct acpi_device *device;
 893
 894         /*
 895          * Fixed hardware devices do not appear in the namespace and do not
 896          * have handles, but we fabricate acpi_devices for them, so we have
 897          * to deal with them specially.
 898          */
 899         if (handle == NULL)
 900                 return acpi_root;
 901
 902         do {
 903                 status = acpi_get_parent(handle, &handle);
 904                 if (status == AE_NULL_ENTRY)
 905                         return NULL;
 906                 if (ACPI_FAILURE(status))
 907                         return acpi_root;
 908
 909                 ret = acpi_bus_get_device(handle, &device);
 910                 if (ret == 0)
 911                         return device;
 912         } while (1);
 913 }
 914
 915 acpi_status
 916 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 917 {
 918         acpi_status status;
 919         acpi_handle tmp;
 920         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 921         union acpi_object *obj;
 922
 923         status = acpi_get_handle(handle, "_EJD", &tmp);
 924         if (ACPI_FAILURE(status))
 925                 return status;
 926
 927         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 928         if (ACPI_SUCCESS(status)) {
 929                 obj = buffer.pointer;
 930                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 931                                          ejd);
 932                 kfree(buffer.pointer);
 933         }
 934         return status;
 935 }
 936 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 937
 938 void acpi_bus_data_handler(acpi_handle handle, void *context)
 939 {
 940
 941         /* TBD */
 942
 943         return;
 944 }
 945
 946 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 947                                         struct acpi_device_wakeup *wakeup)
 948 {
 949         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 950         union acpi_object *package = NULL;
 951         union acpi_object *element = NULL;
 952         acpi_status status;
 953         int err = -ENODATA;
 954
 955         if (!wakeup)
 956                 return -EINVAL;
 957
 958         INIT_LIST_HEAD(&wakeup->resources);
 959
 960         /* _PRW */
 961         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 962         if (ACPI_FAILURE(status)) {
 963                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 964                 return err;
 965         }
 966
 967         package = (union acpi_object *)buffer.pointer;
 968
 969         if (!package || package->package.count < 2)
 970                 goto out;
 971
 972         element = &(package->package.elements[0]);
 973         if (!element)
 974                 goto out;
 975
 976         if (element->type == ACPI_TYPE_PACKAGE) {
 977                 if ((element->package.count < 2) ||
 978                     (element->package.elements[0].type !=
 979                      ACPI_TYPE_LOCAL_REFERENCE)
 980                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 981                         goto out;
 982
 983                 wakeup->gpe_device =
 984                     element->package.elements[0].reference.handle;
 985                 wakeup->gpe_number =
 986                     (u32) element->package.elements[1].integer.value;
 987         } else if (element->type == ACPI_TYPE_INTEGER) {
 988                 wakeup->gpe_device = NULL;
 989                 wakeup->gpe_number = element->integer.value;
 990         } else {
 991                 goto out;
 992         }
 993
 994         element = &(package->package.elements[1]);
 995         if (element->type != ACPI_TYPE_INTEGER)
 996                 goto out;
 997
 998         wakeup->sleep_state = element->integer.value;
 999
1000         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1001         if (err)
1002                 goto out;
1003
1004         if (!list_empty(&wakeup->resources)) {
1005                 int sleep_state;
1006
1007                 sleep_state = acpi_power_min_system_level(&wakeup->resources);
1008                 if (sleep_state < wakeup->sleep_state) {
1009                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
1010                                          "(S%d) by S%d from power resources\n",
1011                                          (int)wakeup->sleep_state, sleep_state);
1012                         wakeup->sleep_state = sleep_state;
1013                 }
1014         }
1015         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1016
1017  out:
1018         kfree(buffer.pointer);
1019         return err;
1020 }
1021
1022 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1023 {
1024         struct acpi_device_id button_device_ids[] = {
1025                 {"PNP0C0C", 0},
1026                 {"PNP0C0D", 0},
1027                 {"PNP0C0E", 0},
1028                 {"", 0},
1029         };
1030         acpi_status status;
1031         acpi_event_status event_status;
1032
1033         device->wakeup.flags.notifier_present = 0;
1034
1035         /* Power button, Lid switch always enable wakeup */
1036         if (!acpi_match_device_ids(device, button_device_ids)) {
1037                 device->wakeup.flags.run_wake = 1;
1038                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1039                         /* Do not use Lid/sleep button for S5 wakeup */
1040                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
1041                                 device->wakeup.sleep_state = ACPI_STATE_S4;
1042                 }
1043                 device_set_wakeup_capable(&device->dev, true);
1044                 return;
1045         }
1046
1047         status = acpi_get_gpe_status(device->wakeup.gpe_device,
1048                                         device->wakeup.gpe_number,
1049                                                 &event_status);
1050         if (status == AE_OK)
1051                 device->wakeup.flags.run_wake =
1052                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1053 }
1054
1055 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1056 {
1057         acpi_handle temp;
1058         acpi_status status = 0;
1059         int err;
1060
1061         /* Presence of _PRW indicates wake capable */
1062         status = acpi_get_handle(device->handle, "_PRW", &temp);
1063         if (ACPI_FAILURE(status))
1064                 return;
1065
1066         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1067                                                            &device->wakeup);
1068         if (err) {
1069                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1070                 return;
1071         }
1072
1073         device->wakeup.flags.valid = 1;
1074         device->wakeup.prepare_count = 0;
1075         acpi_bus_set_run_wake_flags(device);
1076         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1077          * system for the ACPI device with the _PRW object.
1078          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1079          * So it is necessary to call _DSW object first. Only when it is not
1080          * present will the _PSW object used.
1081          */
1082         err = acpi_device_sleep_wake(device, 0, 0, 0);
1083         if (err)
1084                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1085                                 "error in _DSW or _PSW evaluation\n"));
1086 }
1087
1088 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1089 {
1090         struct acpi_device_power_state *ps = &device->power.states[state];
1091         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1092         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1093         acpi_handle handle;
1094         acpi_status status;
1095
1096         INIT_LIST_HEAD(&ps->resources);
1097
1098         /* Evaluate "_PRx" to get referenced power resources */
1099         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1100         if (ACPI_SUCCESS(status)) {
1101                 union acpi_object *package = buffer.pointer;
1102
1103                 if (buffer.length && package
1104                     && package->type == ACPI_TYPE_PACKAGE
1105                     && package->package.count) {
1106                         int err = acpi_extract_power_resources(package, 0,
1107                                                                &ps->resources);
1108                         if (!err)
1109                                 device->power.flags.power_resources = 1;
1110                 }
1111                 ACPI_FREE(buffer.pointer);
1112         }
1113
1114         /* Evaluate "_PSx" to see if we can do explicit sets */
1115         pathname[2] = 'S';
1116         status = acpi_get_handle(device->handle, pathname, &handle);
1117         if (ACPI_SUCCESS(status))
1118                 ps->flags.explicit_set = 1;
1119
1120         /*
1121          * State is valid if there are means to put the device into it.
1122          * D3hot is only valid if _PR3 present.
1123          */
1124         if (!list_empty(&ps->resources)
1125             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1126                 ps->flags.valid = 1;
1127                 ps->flags.os_accessible = 1;
1128         }
1129
1130         ps->power = -1;         /* Unknown - driver assigned */
1131         ps->latency = -1;       /* Unknown - driver assigned */
1132 }
1133
1134 static void acpi_bus_get_power_flags(struct acpi_device *device)
1135 {
1136         acpi_status status;
1137         acpi_handle handle;
1138         u32 i;
1139
1140         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1141         status = acpi_get_handle(device->handle, "_PS0", &handle);
1142         if (ACPI_FAILURE(status)) {
1143                 status = acpi_get_handle(device->handle, "_PR0", &handle);
1144                 if (ACPI_FAILURE(status))
1145                         return;
1146         }
1147
1148         device->flags.power_manageable = 1;
1149
1150         /*
1151          * Power Management Flags
1152          */
1153         status = acpi_get_handle(device->handle, "_PSC", &handle);
1154         if (ACPI_SUCCESS(status))
1155                 device->power.flags.explicit_get = 1;
1156         status = acpi_get_handle(device->handle, "_IRC", &handle);
1157         if (ACPI_SUCCESS(status))
1158                 device->power.flags.inrush_current = 1;
1159
1160         /*
1161          * Enumerate supported power management states
1162          */
1163         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1164                 acpi_bus_init_power_state(device, i);
1165
1166         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1167
1168         /* Set defaults for D0 and D3 states (always valid) */
1169         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1170         device->power.states[ACPI_STATE_D0].power = 100;
1171         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1172         device->power.states[ACPI_STATE_D3].power = 0;
1173
1174         /* Set D3cold's explicit_set flag if _PS3 exists. */
1175         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1176                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1177
1178         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1179         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1180                         device->power.flags.power_resources)
1181                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1182
1183         acpi_bus_init_power(device);
1184 }
1185
1186 static void acpi_bus_get_flags(struct acpi_device *device)
1187 {
1188         acpi_status status = AE_OK;
1189         acpi_handle temp = NULL;
1190
1191         /* Presence of _STA indicates 'dynamic_status' */
1192         status = acpi_get_handle(device->handle, "_STA", &temp);
1193         if (ACPI_SUCCESS(status))
1194                 device->flags.dynamic_status = 1;
1195
1196         /* Presence of _RMV indicates 'removable' */
1197         status = acpi_get_handle(device->handle, "_RMV", &temp);
1198         if (ACPI_SUCCESS(status))
1199                 device->flags.removable = 1;
1200
1201         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1202         status = acpi_get_handle(device->handle, "_EJD", &temp);
1203         if (ACPI_SUCCESS(status))
1204                 device->flags.ejectable = 1;
1205         else {
1206                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1207                 if (ACPI_SUCCESS(status))
1208                         device->flags.ejectable = 1;
1209         }
1210 }
1211
1212 static void acpi_device_get_busid(struct acpi_device *device)
1213 {
1214         char bus_id[5] = { '?', 0 };
1215         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1216         int i = 0;
1217
1218         /*
1219          * Bus ID
1220          * ------
1221          * The device's Bus ID is simply the object name.
1222          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1223          */
1224         if (ACPI_IS_ROOT_DEVICE(device)) {
1225                 strcpy(device->pnp.bus_id, "ACPI");
1226                 return;
1227         }
1228
1229         switch (device->device_type) {
1230         case ACPI_BUS_TYPE_POWER_BUTTON:
1231                 strcpy(device->pnp.bus_id, "PWRF");
1232                 break;
1233         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1234                 strcpy(device->pnp.bus_id, "SLPF");
1235                 break;
1236         default:
1237                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1238                 /* Clean up trailing underscores (if any) */
1239                 for (i = 3; i > 1; i--) {
1240                         if (bus_id[i] == '_')
1241                                 bus_id[i] = '\0';
1242                         else
1243                                 break;
1244                 }
1245                 strcpy(device->pnp.bus_id, bus_id);
1246                 break;
1247         }
1248 }
1249
1250 /*
1251  * acpi_bay_match - see if a device is an ejectable driver bay
1252  *
1253  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1254  * then we can safely call it an ejectable drive bay
1255  */
1256 static int acpi_bay_match(struct acpi_device *device){
1257         acpi_status status;
1258         acpi_handle handle;
1259         acpi_handle tmp;
1260         acpi_handle phandle;
1261
1262         handle = device->handle;
1263
1264         status = acpi_get_handle(handle, "_EJ0", &tmp);
1265         if (ACPI_FAILURE(status))
1266                 return -ENODEV;
1267
1268         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1269                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1270                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1271                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1272                 return 0;
1273
1274         if (acpi_get_parent(handle, &phandle))
1275                 return -ENODEV;
1276
1277         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1278                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1279                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1280                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1281                 return 0;
1282
1283         return -ENODEV;
1284 }
1285
1286 /*
1287  * acpi_dock_match - see if a device has a _DCK method
1288  */
1289 static int acpi_dock_match(struct acpi_device *device)
1290 {
1291         acpi_handle tmp;
1292         return acpi_get_handle(device->handle, "_DCK", &tmp);
1293 }
1294
1295 const char *acpi_device_hid(struct acpi_device *device)
1296 {
1297         struct acpi_hardware_id *hid;
1298
1299         if (list_empty(&device->pnp.ids))
1300                 return dummy_hid;
1301
1302         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1303         return hid->id;
1304 }
1305 EXPORT_SYMBOL(acpi_device_hid);
1306
1307 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1308 {
1309         struct acpi_hardware_id *id;
1310
1311         id = kmalloc(sizeof(*id), GFP_KERNEL);
1312         if (!id)
1313                 return;
1314
1315         id->id = kstrdup(dev_id, GFP_KERNEL);
1316         if (!id->id) {
1317                 kfree(id);
1318                 return;
1319         }
1320
1321         list_add_tail(&id->list, &device->pnp.ids);
1322 }
1323
1324 /*
1325  * Old IBM workstations have a DSDT bug wherein the SMBus object
1326  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1327  * prefix.  Work around this.
1328  */
1329 static int acpi_ibm_smbus_match(struct acpi_device *device)
1330 {
1331         acpi_handle h_dummy;
1332         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1333         int result;
1334
1335         if (!dmi_name_in_vendors("IBM"))
1336                 return -ENODEV;
1337
1338         /* Look for SMBS object */
1339         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1340         if (result)
1341                 return result;
1342
1343         if (strcmp("SMBS", path.pointer)) {
1344                 result = -ENODEV;
1345                 goto out;
1346         }
1347
1348         /* Does it have the necessary (but misnamed) methods? */
1349         result = -ENODEV;
1350         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1351             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1352             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1353                 result = 0;
1354 out:
1355         kfree(path.pointer);
1356         return result;
1357 }
1358
1359 static void acpi_device_set_id(struct acpi_device *device)
1360 {
1361         acpi_status status;
1362         struct acpi_device_info *info;
1363         struct acpi_pnp_device_id_list *cid_list;
1364         int i;
1365
1366         switch (device->device_type) {
1367         case ACPI_BUS_TYPE_DEVICE:
1368                 if (ACPI_IS_ROOT_DEVICE(device)) {
1369                         acpi_add_id(device, ACPI_SYSTEM_HID);
1370                         break;
1371                 }
1372
1373                 status = acpi_get_object_info(device->handle, &info);
1374                 if (ACPI_FAILURE(status)) {
1375                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1376                         return;
1377                 }
1378
1379                 if (info->valid & ACPI_VALID_HID)
1380                         acpi_add_id(device, info->hardware_id.string);
1381                 if (info->valid & ACPI_VALID_CID) {
1382                         cid_list = &info->compatible_id_list;
1383                         for (i = 0; i < cid_list->count; i++)
1384                                 acpi_add_id(device, cid_list->ids[i].string);
1385                 }
1386                 if (info->valid & ACPI_VALID_ADR) {
1387                         device->pnp.bus_address = info->address;
1388                         device->flags.bus_address = 1;
1389                 }
1390                 if (info->valid & ACPI_VALID_UID)
1391                         device->pnp.unique_id = kstrdup(info->unique_id.string,
1392                                                         GFP_KERNEL);
1393
1394                 kfree(info);
1395
1396                 /*
1397                  * Some devices don't reliably have _HIDs & _CIDs, so add
1398                  * synthetic HIDs to make sure drivers can find them.
1399                  */
1400                 if (acpi_is_video_device(device))
1401                         acpi_add_id(device, ACPI_VIDEO_HID);
1402                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1403                         acpi_add_id(device, ACPI_BAY_HID);
1404                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1405                         acpi_add_id(device, ACPI_DOCK_HID);
1406                 else if (!acpi_ibm_smbus_match(device))
1407                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1408                 else if (list_empty(&device->pnp.ids) &&
1409                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1410                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1411                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1412                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1413                 }
1414
1415                 break;
1416         case ACPI_BUS_TYPE_POWER:
1417                 acpi_add_id(device, ACPI_POWER_HID);
1418                 break;
1419         case ACPI_BUS_TYPE_PROCESSOR:
1420                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1421                 break;
1422         case ACPI_BUS_TYPE_THERMAL:
1423                 acpi_add_id(device, ACPI_THERMAL_HID);
1424                 break;
1425         case ACPI_BUS_TYPE_POWER_BUTTON:
1426                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1427                 break;
1428         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1429                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1430                 break;
1431         }
1432 }
1433
1434 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1435                              int type, unsigned long long sta)
1436 {
1437         INIT_LIST_HEAD(&device->pnp.ids);
1438         device->device_type = type;
1439         device->handle = handle;
1440         device->parent = acpi_bus_get_parent(handle);
1441         STRUCT_TO_INT(device->status) = sta;
1442         acpi_device_get_busid(device);
1443         acpi_device_set_id(device);
1444         acpi_bus_get_flags(device);
1445         device_initialize(&device->dev);
1446         dev_set_uevent_suppress(&device->dev, true);
1447 }
1448
1449 void acpi_device_add_finalize(struct acpi_device *device)
1450 {
1451         dev_set_uevent_suppress(&device->dev, false);
1452         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1453 }
1454
1455 static int acpi_add_single_object(struct acpi_device **child,
1456                                   acpi_handle handle, int type,
1457                                   unsigned long long sta, bool match_driver)
1458 {
1459         int result;
1460         struct acpi_device *device;
1461         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1462
1463         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1464         if (!device) {
1465                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1466                 return -ENOMEM;
1467         }
1468
1469         acpi_init_device_object(device, handle, type, sta);
1470         acpi_bus_get_power_flags(device);
1471         acpi_bus_get_wakeup_device_flags(device);
1472
1473         device->flags.match_driver = match_driver;
1474         result = acpi_device_add(device, acpi_device_release);
1475         if (result) {
1476                 acpi_device_release(&device->dev);
1477                 return result;
1478         }
1479
1480         acpi_power_add_remove_device(device, true);
1481         acpi_device_add_finalize(device);
1482         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1483         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1484                 dev_name(&device->dev), (char *) buffer.pointer,
1485                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1486         kfree(buffer.pointer);
1487         *child = device;
1488         return 0;
1489 }
1490
1491 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1492                                     unsigned long long *sta)
1493 {
1494         acpi_status status;
1495         acpi_object_type acpi_type;
1496
1497         status = acpi_get_type(handle, &acpi_type);
1498         if (ACPI_FAILURE(status))
1499                 return -ENODEV;
1500
1501         switch (acpi_type) {
1502         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1503         case ACPI_TYPE_DEVICE:
1504                 *type = ACPI_BUS_TYPE_DEVICE;
1505                 status = acpi_bus_get_status_handle(handle, sta);
1506                 if (ACPI_FAILURE(status))
1507                         return -ENODEV;
1508                 break;
1509         case ACPI_TYPE_PROCESSOR:
1510                 *type = ACPI_BUS_TYPE_PROCESSOR;
1511                 status = acpi_bus_get_status_handle(handle, sta);
1512                 if (ACPI_FAILURE(status))
1513                         return -ENODEV;
1514                 break;
1515         case ACPI_TYPE_THERMAL:
1516                 *type = ACPI_BUS_TYPE_THERMAL;
1517                 *sta = ACPI_STA_DEFAULT;
1518                 break;
1519         case ACPI_TYPE_POWER:
1520                 *type = ACPI_BUS_TYPE_POWER;
1521                 *sta = ACPI_STA_DEFAULT;
1522                 break;
1523         default:
1524                 return -ENODEV;
1525         }
1526
1527         return 0;
1528 }
1529
1530 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1531                                       void *not_used, void **return_value)
1532 {
1533         struct acpi_device *device = NULL;
1534         int type;
1535         unsigned long long sta;
1536         acpi_status status;
1537         int result;
1538
1539         acpi_bus_get_device(handle, &device);
1540         if (device)
1541                 goto out;
1542
1543         result = acpi_bus_type_and_status(handle, &type, &sta);
1544         if (result)
1545                 return AE_OK;
1546
1547         if (type == ACPI_BUS_TYPE_POWER) {
1548                 acpi_add_power_resource(handle);
1549                 return AE_OK;
1550         }
1551
1552         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1553             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1554                 struct acpi_device_wakeup wakeup;
1555                 acpi_handle temp;
1556
1557                 status = acpi_get_handle(handle, "_PRW", &temp);
1558                 if (ACPI_SUCCESS(status)) {
1559                         acpi_bus_extract_wakeup_device_power_package(handle,
1560                                                                      &wakeup);
1561                         acpi_power_resources_list_free(&wakeup.resources);
1562                 }
1563                 return AE_CTRL_DEPTH;
1564         }
1565
1566         acpi_add_single_object(&device, handle, type, sta, false);
1567         if (!device)
1568                 return AE_CTRL_DEPTH;
1569
1570         device->flags.match_driver = true;
1571
1572  out:
1573         if (!*return_value)
1574                 *return_value = device;
1575
1576         return AE_OK;
1577 }
1578
1579 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1580                                           void *not_used, void **ret_not_used)
1581 {
1582         acpi_status status = AE_OK;
1583         struct acpi_device *device;
1584         unsigned long long sta_not_used;
1585         int type_not_used;
1586
1587         /*
1588          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1589          * namespace walks prematurely.
1590          */
1591         if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
1592                 return AE_OK;
1593
1594         if (acpi_bus_get_device(handle, &device))
1595                 return AE_CTRL_DEPTH;
1596
1597         if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
1598                 /* This is a known good platform device. */
1599                 acpi_create_platform_device(device);
1600         } else if (device_attach(&device->dev) < 0) {
1601                 status = AE_CTRL_DEPTH;
1602         }
1603         return status;
1604 }
1605
1606 static int acpi_bus_scan(acpi_handle handle)
1607 {
1608         void *device = NULL;
1609
1610         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1611                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1612                                     acpi_bus_check_add, NULL, NULL, &device);
1613
1614         if (!device)
1615                 return -ENODEV;
1616
1617         if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1618                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1619                                     acpi_bus_device_attach, NULL, NULL, NULL);
1620
1621         return 0;
1622 }
1623
1624 /**
1625  * acpi_bus_add - Add ACPI device node objects in a given namespace scope.
1626  * @handle: Root of the namespace scope to scan.
1627  *
1628  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1629  * found devices.
1630  *
1631  * If no devices were found, -ENODEV is returned, but it does not mean that
1632  * there has been a real error.  There just have been no suitable ACPI objects
1633  * in the table trunk from which the kernel could create a device and add an
1634  * appropriate driver.
1635  */
1636 int acpi_bus_add(acpi_handle handle)
1637 {
1638         int err;
1639
1640         err = acpi_bus_scan(handle);
1641         if (err)
1642                 return err;
1643
1644         acpi_update_all_gpes();
1645         return 0;
1646 }
1647 EXPORT_SYMBOL(acpi_bus_add);
1648
1649 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1650                                           void *not_used, void **ret_not_used)
1651 {
1652         struct acpi_device *device = NULL;
1653
1654         if (!acpi_bus_get_device(handle, &device)) {
1655                 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1656                 device_release_driver(&device->dev);
1657         }
1658         return AE_OK;
1659 }
1660
1661 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1662                                    void *not_used, void **ret_not_used)
1663 {
1664         struct acpi_device *device = NULL;
1665
1666         if (!acpi_bus_get_device(handle, &device))
1667                 acpi_device_unregister(device);
1668
1669         return AE_OK;
1670 }
1671
1672 int acpi_bus_trim(struct acpi_device *start)
1673 {
1674         /*
1675          * Execute acpi_bus_device_detach() as a post-order callback to detach
1676          * all ACPI drivers from the device nodes being removed.
1677          */
1678         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1679                             acpi_bus_device_detach, NULL, NULL);
1680         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1681         /*
1682          * Execute acpi_bus_remove() as a post-order callback to remove device
1683          * nodes in the given namespace scope.
1684          */
1685         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1686                             acpi_bus_remove, NULL, NULL);
1687         acpi_bus_remove(start->handle, 0, NULL, NULL);
1688         return 0;
1689 }
1690 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1691
1692 static int acpi_bus_scan_fixed(void)
1693 {
1694         int result = 0;
1695         struct acpi_device *device = NULL;
1696
1697         /*
1698          * Enumerate all fixed-feature devices.
1699          */
1700         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1701                 result = acpi_add_single_object(&device, NULL,
1702                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1703                                                 ACPI_STA_DEFAULT, true);
1704                 device_init_wakeup(&device->dev, true);
1705         }
1706
1707         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1708                 result = acpi_add_single_object(&device, NULL,
1709                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1710                                                 ACPI_STA_DEFAULT, true);
1711         }
1712
1713         return result;
1714 }
1715
1716 int __init acpi_scan_init(void)
1717 {
1718         int result;
1719
1720         result = bus_register(&acpi_bus_type);
1721         if (result) {
1722                 /* We don't want to quit even if we failed to add suspend/resume */
1723                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1724         }
1725
1726         acpi_pci_root_init();
1727
1728         /*
1729          * Enumerate devices in the ACPI namespace.
1730          */
1731         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1732         if (result)
1733                 return result;
1734
1735         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1736         if (!result)
1737                 result = acpi_bus_scan_fixed();
1738
1739         if (result)
1740                 acpi_device_unregister(acpi_root);
1741         else
1742                 acpi_update_all_gpes();
1743
1744         return result;
1745 }