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 static DEFINE_MUTEX(acpi_scan_lock);
  56 DEFINE_MUTEX(acpi_device_lock);
  57 LIST_HEAD(acpi_wakeup_device_list);
  58
  59 struct acpi_device_bus_id{
  60         char bus_id[15];
  61         unsigned int instance_no;
  62         struct list_head node;
  63 };
  64
  65 /*
  66  * Creates hid/cid(s) string needed for modalias and uevent
  67  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  68  * char *modalias: "acpi:IBM0001:ACPI0001"
  69 */
  70 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  71                            int size)
  72 {
  73         int len;
  74         int count;
  75         struct acpi_hardware_id *id;
  76
  77         if (list_empty(&acpi_dev->pnp.ids))
  78                 return 0;
  79
  80         len = snprintf(modalias, size, "acpi:");
  81         size -= len;
  82
  83         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
  84                 count = snprintf(&modalias[len], size, "%s:", id->id);
  85                 if (count < 0 || count >= size)
  86                         return -EINVAL;
  87                 len += count;
  88                 size -= count;
  89         }
  90
  91         modalias[len] = '\0';
  92         return len;
  93 }
  94
  95 static ssize_t
  96 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  97         struct acpi_device *acpi_dev = to_acpi_device(dev);
  98         int len;
  99
 100         /* Device has no HID and no CID or string is >1024 */
 101         len = create_modalias(acpi_dev, buf, 1024);
 102         if (len <= 0)
 103                 return 0;
 104         buf[len++] = '\n';
 105         return len;
 106 }
 107 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 108
 109 /**
 110  * acpi_bus_hot_remove_device: hot-remove a device and its children
 111  * @context: struct acpi_eject_event pointer (freed in this func)
 112  *
 113  * Hot-remove a device and its children. This function frees up the
 114  * memory space passed by arg context, so that the caller may call
 115  * this function asynchronously through acpi_os_hotplug_execute().
 116  */
 117 void acpi_bus_hot_remove_device(void *context)
 118 {
 119         struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
 120         struct acpi_device *device = ej_event->device;
 121         acpi_handle handle = device->handle;
 122         acpi_handle temp;
 123         struct acpi_object_list arg_list;
 124         union acpi_object arg;
 125         acpi_status status = AE_OK;
 126         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 127
 128         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 129                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 130
 131         acpi_bus_trim(device);
 132         /* Device node has been released. */
 133         device = NULL;
 134
 135         /* power off device */
 136         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 137         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 138                 printk(KERN_WARNING PREFIX
 139                                 "Power-off device failed\n");
 140
 141         if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
 142                 arg_list.count = 1;
 143                 arg_list.pointer = &arg;
 144                 arg.type = ACPI_TYPE_INTEGER;
 145                 arg.integer.value = 0;
 146                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 147         }
 148
 149         arg_list.count = 1;
 150         arg_list.pointer = &arg;
 151         arg.type = ACPI_TYPE_INTEGER;
 152         arg.integer.value = 1;
 153
 154         /*
 155          * TBD: _EJD support.
 156          */
 157         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 158         if (ACPI_FAILURE(status)) {
 159                 if (status != AE_NOT_FOUND)
 160                         printk(KERN_WARNING PREFIX
 161                                         "Eject device failed\n");
 162                 goto err_out;
 163         }
 164
 165         kfree(context);
 166         return;
 167
 168 err_out:
 169         /* Inform firmware the hot-remove operation has completed w/ error */
 170         (void) acpi_evaluate_hotplug_ost(handle,
 171                                 ej_event->event, ost_code, NULL);
 172         kfree(context);
 173         return;
 174 }
 175 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 176
 177 static ssize_t real_power_state_show(struct device *dev,
 178                                      struct device_attribute *attr, char *buf)
 179 {
 180         struct acpi_device *adev = to_acpi_device(dev);
 181         int state;
 182         int ret;
 183
 184         ret = acpi_device_get_power(adev, &state);
 185         if (ret)
 186                 return ret;
 187
 188         return sprintf(buf, "%s\n", acpi_power_state_string(state));
 189 }
 190
 191 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 192
 193 static ssize_t power_state_show(struct device *dev,
 194                                 struct device_attribute *attr, char *buf)
 195 {
 196         struct acpi_device *adev = to_acpi_device(dev);
 197
 198         return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 199 }
 200
 201 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 202
 203 static ssize_t
 204 acpi_eject_store(struct device *d, struct device_attribute *attr,
 205                 const char *buf, size_t count)
 206 {
 207         int ret = count;
 208         acpi_status status;
 209         acpi_object_type type = 0;
 210         struct acpi_device *acpi_device = to_acpi_device(d);
 211         struct acpi_eject_event *ej_event;
 212
 213         if ((!count) || (buf[0] != '1')) {
 214                 return -EINVAL;
 215         }
 216 #ifndef FORCE_EJECT
 217         if (acpi_device->driver == NULL) {
 218                 ret = -ENODEV;
 219                 goto err;
 220         }
 221 #endif
 222         status = acpi_get_type(acpi_device->handle, &type);
 223         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 224                 ret = -ENODEV;
 225                 goto err;
 226         }
 227
 228         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 229         if (!ej_event) {
 230                 ret = -ENOMEM;
 231                 goto err;
 232         }
 233
 234         ej_event->device = acpi_device;
 235         if (acpi_device->flags.eject_pending) {
 236                 /* event originated from ACPI eject notification */
 237                 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
 238                 acpi_device->flags.eject_pending = 0;
 239         } else {
 240                 /* event originated from user */
 241                 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
 242                 (void) acpi_evaluate_hotplug_ost(acpi_device->handle,
 243                         ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 244         }
 245
 246         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
 247 err:
 248         return ret;
 249 }
 250
 251 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 252
 253 static ssize_t
 254 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 255         struct acpi_device *acpi_dev = to_acpi_device(dev);
 256
 257         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 258 }
 259 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 260
 261 static ssize_t acpi_device_uid_show(struct device *dev,
 262                                     struct device_attribute *attr, char *buf)
 263 {
 264         struct acpi_device *acpi_dev = to_acpi_device(dev);
 265
 266         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 267 }
 268 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 269
 270 static ssize_t acpi_device_adr_show(struct device *dev,
 271                                     struct device_attribute *attr, char *buf)
 272 {
 273         struct acpi_device *acpi_dev = to_acpi_device(dev);
 274
 275         return sprintf(buf, "0x%08x\n",
 276                        (unsigned int)(acpi_dev->pnp.bus_address));
 277 }
 278 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 279
 280 static ssize_t
 281 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 282         struct acpi_device *acpi_dev = to_acpi_device(dev);
 283         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 284         int result;
 285
 286         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 287         if (result)
 288                 goto end;
 289
 290         result = sprintf(buf, "%s\n", (char*)path.pointer);
 291         kfree(path.pointer);
 292 end:
 293         return result;
 294 }
 295 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 296
 297 /* sysfs file that shows description text from the ACPI _STR method */
 298 static ssize_t description_show(struct device *dev,
 299                                 struct device_attribute *attr,
 300                                 char *buf) {
 301         struct acpi_device *acpi_dev = to_acpi_device(dev);
 302         int result;
 303
 304         if (acpi_dev->pnp.str_obj == NULL)
 305                 return 0;
 306
 307         /*
 308          * The _STR object contains a Unicode identifier for a device.
 309          * We need to convert to utf-8 so it can be displayed.
 310          */
 311         result = utf16s_to_utf8s(
 312                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 313                 acpi_dev->pnp.str_obj->buffer.length,
 314                 UTF16_LITTLE_ENDIAN, buf,
 315                 PAGE_SIZE);
 316
 317         buf[result++] = '\n';
 318
 319         return result;
 320 }
 321 static DEVICE_ATTR(description, 0444, description_show, NULL);
 322
 323 static ssize_t
 324 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 325                      char *buf) {
 326         struct acpi_device *acpi_dev = to_acpi_device(dev);
 327
 328         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 329 }
 330 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 331
 332 static int acpi_device_setup_files(struct acpi_device *dev)
 333 {
 334         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 335         acpi_status status;
 336         acpi_handle temp;
 337         unsigned long long sun;
 338         int result = 0;
 339
 340         /*
 341          * Devices gotten from FADT don't have a "path" attribute
 342          */
 343         if (dev->handle) {
 344                 result = device_create_file(&dev->dev, &dev_attr_path);
 345                 if (result)
 346                         goto end;
 347         }
 348
 349         if (!list_empty(&dev->pnp.ids)) {
 350                 result = device_create_file(&dev->dev, &dev_attr_hid);
 351                 if (result)
 352                         goto end;
 353
 354                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 355                 if (result)
 356                         goto end;
 357         }
 358
 359         /*
 360          * If device has _STR, 'description' file is created
 361          */
 362         status = acpi_get_handle(dev->handle, "_STR", &temp);
 363         if (ACPI_SUCCESS(status)) {
 364                 status = acpi_evaluate_object(dev->handle, "_STR",
 365                                         NULL, &buffer);
 366                 if (ACPI_FAILURE(status))
 367                         buffer.pointer = NULL;
 368                 dev->pnp.str_obj = buffer.pointer;
 369                 result = device_create_file(&dev->dev, &dev_attr_description);
 370                 if (result)
 371                         goto end;
 372         }
 373
 374         if (dev->flags.bus_address)
 375                 result = device_create_file(&dev->dev, &dev_attr_adr);
 376         if (dev->pnp.unique_id)
 377                 result = device_create_file(&dev->dev, &dev_attr_uid);
 378
 379         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 380         if (ACPI_SUCCESS(status)) {
 381                 dev->pnp.sun = (unsigned long)sun;
 382                 result = device_create_file(&dev->dev, &dev_attr_sun);
 383                 if (result)
 384                         goto end;
 385         } else {
 386                 dev->pnp.sun = (unsigned long)-1;
 387         }
 388
 389         /*
 390          * If device has _EJ0, 'eject' file is created that is used to trigger
 391          * hot-removal function from userland.
 392          */
 393         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 394         if (ACPI_SUCCESS(status)) {
 395                 result = device_create_file(&dev->dev, &dev_attr_eject);
 396                 if (result)
 397                         return result;
 398         }
 399
 400         if (dev->flags.power_manageable) {
 401                 result = device_create_file(&dev->dev, &dev_attr_power_state);
 402                 if (result)
 403                         return result;
 404
 405                 if (dev->power.flags.power_resources)
 406                         result = device_create_file(&dev->dev,
 407                                                     &dev_attr_real_power_state);
 408         }
 409
 410 end:
 411         return result;
 412 }
 413
 414 static void acpi_device_remove_files(struct acpi_device *dev)
 415 {
 416         acpi_status status;
 417         acpi_handle temp;
 418
 419         if (dev->flags.power_manageable) {
 420                 device_remove_file(&dev->dev, &dev_attr_power_state);
 421                 if (dev->power.flags.power_resources)
 422                         device_remove_file(&dev->dev,
 423                                            &dev_attr_real_power_state);
 424         }
 425
 426         /*
 427          * If device has _STR, remove 'description' file
 428          */
 429         status = acpi_get_handle(dev->handle, "_STR", &temp);
 430         if (ACPI_SUCCESS(status)) {
 431                 kfree(dev->pnp.str_obj);
 432                 device_remove_file(&dev->dev, &dev_attr_description);
 433         }
 434         /*
 435          * If device has _EJ0, remove 'eject' file.
 436          */
 437         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 438         if (ACPI_SUCCESS(status))
 439                 device_remove_file(&dev->dev, &dev_attr_eject);
 440
 441         status = acpi_get_handle(dev->handle, "_SUN", &temp);
 442         if (ACPI_SUCCESS(status))
 443                 device_remove_file(&dev->dev, &dev_attr_sun);
 444
 445         if (dev->pnp.unique_id)
 446                 device_remove_file(&dev->dev, &dev_attr_uid);
 447         if (dev->flags.bus_address)
 448                 device_remove_file(&dev->dev, &dev_attr_adr);
 449         device_remove_file(&dev->dev, &dev_attr_modalias);
 450         device_remove_file(&dev->dev, &dev_attr_hid);
 451         if (dev->handle)
 452                 device_remove_file(&dev->dev, &dev_attr_path);
 453 }
 454 /* --------------------------------------------------------------------------
 455                         ACPI Bus operations
 456    -------------------------------------------------------------------------- */
 457
 458 static const struct acpi_device_id *__acpi_match_device(
 459         struct acpi_device *device, const struct acpi_device_id *ids)
 460 {
 461         const struct acpi_device_id *id;
 462         struct acpi_hardware_id *hwid;
 463
 464         /*
 465          * If the device is not present, it is unnecessary to load device
 466          * driver for it.
 467          */
 468         if (!device->status.present)
 469                 return NULL;
 470
 471         for (id = ids; id->id[0]; id++)
 472                 list_for_each_entry(hwid, &device->pnp.ids, list)
 473                         if (!strcmp((char *) id->id, hwid->id))
 474                                 return id;
 475
 476         return NULL;
 477 }
 478
 479 /**
 480  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 481  * @ids: Array of struct acpi_device_id object to match against.
 482  * @dev: The device structure to match.
 483  *
 484  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 485  * object for that handle and use that object to match against a given list of
 486  * device IDs.
 487  *
 488  * Return a pointer to the first matching ID on success or %NULL on failure.
 489  */
 490 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 491                                                const struct device *dev)
 492 {
 493         struct acpi_device *adev;
 494
 495         if (!ids || !ACPI_HANDLE(dev)
 496             || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
 497                 return NULL;
 498
 499         return __acpi_match_device(adev, ids);
 500 }
 501 EXPORT_SYMBOL_GPL(acpi_match_device);
 502
 503 int acpi_match_device_ids(struct acpi_device *device,
 504                           const struct acpi_device_id *ids)
 505 {
 506         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 507 }
 508 EXPORT_SYMBOL(acpi_match_device_ids);
 509
 510 void acpi_free_ids(struct acpi_device *device)
 511 {
 512         struct acpi_hardware_id *id, *tmp;
 513
 514         list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
 515                 kfree(id->id);
 516                 kfree(id);
 517         }
 518         kfree(device->pnp.unique_id);
 519 }
 520
 521 static void acpi_free_power_resources_lists(struct acpi_device *device)
 522 {
 523         int i;
 524
 525         if (device->wakeup.flags.valid)
 526                 acpi_power_resources_list_free(&device->wakeup.resources);
 527
 528         if (!device->flags.power_manageable)
 529                 return;
 530
 531         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 532                 struct acpi_device_power_state *ps = &device->power.states[i];
 533                 acpi_power_resources_list_free(&ps->resources);
 534         }
 535 }
 536
 537 static void acpi_device_release(struct device *dev)
 538 {
 539         struct acpi_device *acpi_dev = to_acpi_device(dev);
 540
 541         acpi_free_ids(acpi_dev);
 542         acpi_free_power_resources_lists(acpi_dev);
 543         kfree(acpi_dev);
 544 }
 545
 546 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 547 {
 548         struct acpi_device *acpi_dev = to_acpi_device(dev);
 549         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 550
 551         return acpi_dev->flags.match_driver
 552                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 553 }
 554
 555 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 556 {
 557         struct acpi_device *acpi_dev = to_acpi_device(dev);
 558         int len;
 559
 560         if (list_empty(&acpi_dev->pnp.ids))
 561                 return 0;
 562
 563         if (add_uevent_var(env, "MODALIAS="))
 564                 return -ENOMEM;
 565         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 566                               sizeof(env->buf) - env->buflen);
 567         if (len >= (sizeof(env->buf) - env->buflen))
 568                 return -ENOMEM;
 569         env->buflen += len;
 570         return 0;
 571 }
 572
 573 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 574 {
 575         struct acpi_device *device = data;
 576
 577         device->driver->ops.notify(device, event);
 578 }
 579
 580 static acpi_status acpi_device_notify_fixed(void *data)
 581 {
 582         struct acpi_device *device = data;
 583
 584         /* Fixed hardware devices have no handles */
 585         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 586         return AE_OK;
 587 }
 588
 589 static int acpi_device_install_notify_handler(struct acpi_device *device)
 590 {
 591         acpi_status status;
 592
 593         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 594                 status =
 595                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 596                                                      acpi_device_notify_fixed,
 597                                                      device);
 598         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 599                 status =
 600                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 601                                                      acpi_device_notify_fixed,
 602                                                      device);
 603         else
 604                 status = acpi_install_notify_handler(device->handle,
 605                                                      ACPI_DEVICE_NOTIFY,
 606                                                      acpi_device_notify,
 607                                                      device);
 608
 609         if (ACPI_FAILURE(status))
 610                 return -EINVAL;
 611         return 0;
 612 }
 613
 614 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 615 {
 616         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 617                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 618                                                 acpi_device_notify_fixed);
 619         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 620                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 621                                                 acpi_device_notify_fixed);
 622         else
 623                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 624                                            acpi_device_notify);
 625 }
 626
 627 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 628 static int acpi_device_probe(struct device * dev)
 629 {
 630         struct acpi_device *acpi_dev = to_acpi_device(dev);
 631         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 632         int ret;
 633
 634         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 635         if (!ret) {
 636                 if (acpi_drv->ops.notify) {
 637                         ret = acpi_device_install_notify_handler(acpi_dev);
 638                         if (ret) {
 639                                 if (acpi_drv->ops.remove)
 640                                         acpi_drv->ops.remove(acpi_dev);
 641                                 return ret;
 642                         }
 643                 }
 644
 645                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 646                         "Found driver [%s] for device [%s]\n",
 647                         acpi_drv->name, acpi_dev->pnp.bus_id));
 648                 get_device(dev);
 649         }
 650         return ret;
 651 }
 652
 653 static int acpi_device_remove(struct device * dev)
 654 {
 655         struct acpi_device *acpi_dev = to_acpi_device(dev);
 656         struct acpi_driver *acpi_drv = acpi_dev->driver;
 657
 658         if (acpi_drv) {
 659                 if (acpi_drv->ops.notify)
 660                         acpi_device_remove_notify_handler(acpi_dev);
 661                 if (acpi_drv->ops.remove)
 662                         acpi_drv->ops.remove(acpi_dev);
 663         }
 664         acpi_dev->driver = NULL;
 665         acpi_dev->driver_data = NULL;
 666
 667         put_device(dev);
 668         return 0;
 669 }
 670
 671 struct bus_type acpi_bus_type = {
 672         .name           = "acpi",
 673         .match          = acpi_bus_match,
 674         .probe          = acpi_device_probe,
 675         .remove         = acpi_device_remove,
 676         .uevent         = acpi_device_uevent,
 677 };
 678
 679 int acpi_device_add(struct acpi_device *device,
 680                     void (*release)(struct device *))
 681 {
 682         int result;
 683         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 684         int found = 0;
 685
 686         if (device->handle) {
 687                 acpi_status status;
 688
 689                 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
 690                                           device);
 691                 if (ACPI_FAILURE(status)) {
 692                         acpi_handle_err(device->handle,
 693                                         "Unable to attach device data\n");
 694                         return -ENODEV;
 695                 }
 696         }
 697
 698         /*
 699          * Linkage
 700          * -------
 701          * Link this device to its parent and siblings.
 702          */
 703         INIT_LIST_HEAD(&device->children);
 704         INIT_LIST_HEAD(&device->node);
 705         INIT_LIST_HEAD(&device->wakeup_list);
 706         INIT_LIST_HEAD(&device->physical_node_list);
 707         mutex_init(&device->physical_node_lock);
 708         INIT_LIST_HEAD(&device->power_dependent);
 709
 710         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 711         if (!new_bus_id) {
 712                 pr_err(PREFIX "Memory allocation error\n");
 713                 result = -ENOMEM;
 714                 goto err_detach;
 715         }
 716
 717         mutex_lock(&acpi_device_lock);
 718         /*
 719          * Find suitable bus_id and instance number in acpi_bus_id_list
 720          * If failed, create one and link it into acpi_bus_id_list
 721          */
 722         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 723                 if (!strcmp(acpi_device_bus_id->bus_id,
 724                             acpi_device_hid(device))) {
 725                         acpi_device_bus_id->instance_no++;
 726                         found = 1;
 727                         kfree(new_bus_id);
 728                         break;
 729                 }
 730         }
 731         if (!found) {
 732                 acpi_device_bus_id = new_bus_id;
 733                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 734                 acpi_device_bus_id->instance_no = 0;
 735                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 736         }
 737         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 738
 739         if (device->parent)
 740                 list_add_tail(&device->node, &device->parent->children);
 741
 742         if (device->wakeup.flags.valid)
 743                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 744         mutex_unlock(&acpi_device_lock);
 745
 746         if (device->parent)
 747                 device->dev.parent = &device->parent->dev;
 748         device->dev.bus = &acpi_bus_type;
 749         device->dev.release = release;
 750         result = device_add(&device->dev);
 751         if (result) {
 752                 dev_err(&device->dev, "Error registering device\n");
 753                 goto err;
 754         }
 755
 756         result = acpi_device_setup_files(device);
 757         if (result)
 758                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 759                        dev_name(&device->dev));
 760
 761         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 762         return 0;
 763
 764  err:
 765         mutex_lock(&acpi_device_lock);
 766         if (device->parent)
 767                 list_del(&device->node);
 768         list_del(&device->wakeup_list);
 769         mutex_unlock(&acpi_device_lock);
 770
 771  err_detach:
 772         acpi_detach_data(device->handle, acpi_bus_data_handler);
 773         return result;
 774 }
 775
 776 static void acpi_device_unregister(struct acpi_device *device)
 777 {
 778         mutex_lock(&acpi_device_lock);
 779         if (device->parent)
 780                 list_del(&device->node);
 781
 782         list_del(&device->wakeup_list);
 783         mutex_unlock(&acpi_device_lock);
 784
 785         acpi_detach_data(device->handle, acpi_bus_data_handler);
 786
 787         acpi_power_add_remove_device(device, false);
 788         acpi_device_remove_files(device);
 789         if (device->remove)
 790                 device->remove(device);
 791
 792         device_del(&device->dev);
 793         /*
 794          * Drop the reference counts of all power resources the device depends
 795          * on and turn off the ones that have no more references.
 796          */
 797         acpi_power_transition(device, ACPI_STATE_D3_COLD);
 798         put_device(&device->dev);
 799 }
 800
 801 /* --------------------------------------------------------------------------
 802                                  Driver Management
 803    -------------------------------------------------------------------------- */
 804 /**
 805  * acpi_bus_driver_init - add a device to a driver
 806  * @device: the device to add and initialize
 807  * @driver: driver for the device
 808  *
 809  * Used to initialize a device via its device driver.  Called whenever a
 810  * driver is bound to a device.  Invokes the driver's add() ops.
 811  */
 812 static int
 813 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 814 {
 815         int result = 0;
 816
 817         if (!device || !driver)
 818                 return -EINVAL;
 819
 820         if (!driver->ops.add)
 821                 return -ENOSYS;
 822
 823         result = driver->ops.add(device);
 824         if (result) {
 825                 device->driver = NULL;
 826                 device->driver_data = NULL;
 827                 return result;
 828         }
 829
 830         device->driver = driver;
 831
 832         /*
 833          * TBD - Configuration Management: Assign resources to device based
 834          * upon possible configuration and currently allocated resources.
 835          */
 836
 837         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 838                           "Driver successfully bound to device\n"));
 839         return 0;
 840 }
 841
 842 /**
 843  * acpi_bus_register_driver - register a driver with the ACPI bus
 844  * @driver: driver being registered
 845  *
 846  * Registers a driver with the ACPI bus.  Searches the namespace for all
 847  * devices that match the driver's criteria and binds.  Returns zero for
 848  * success or a negative error status for failure.
 849  */
 850 int acpi_bus_register_driver(struct acpi_driver *driver)
 851 {
 852         int ret;
 853
 854         if (acpi_disabled)
 855                 return -ENODEV;
 856         driver->drv.name = driver->name;
 857         driver->drv.bus = &acpi_bus_type;
 858         driver->drv.owner = driver->owner;
 859
 860         ret = driver_register(&driver->drv);
 861         return ret;
 862 }
 863
 864 EXPORT_SYMBOL(acpi_bus_register_driver);
 865
 866 /**
 867  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 868  * @driver: driver to unregister
 869  *
 870  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 871  * devices that match the driver's criteria and unbinds.
 872  */
 873 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 874 {
 875         driver_unregister(&driver->drv);
 876 }
 877
 878 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 879
 880 /* --------------------------------------------------------------------------
 881                                  Device Enumeration
 882    -------------------------------------------------------------------------- */
 883 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 884 {
 885         acpi_status status;
 886         int ret;
 887         struct acpi_device *device;
 888
 889         /*
 890          * Fixed hardware devices do not appear in the namespace and do not
 891          * have handles, but we fabricate acpi_devices for them, so we have
 892          * to deal with them specially.
 893          */
 894         if (handle == NULL)
 895                 return acpi_root;
 896
 897         do {
 898                 status = acpi_get_parent(handle, &handle);
 899                 if (status == AE_NULL_ENTRY)
 900                         return NULL;
 901                 if (ACPI_FAILURE(status))
 902                         return acpi_root;
 903
 904                 ret = acpi_bus_get_device(handle, &device);
 905                 if (ret == 0)
 906                         return device;
 907         } while (1);
 908 }
 909
 910 acpi_status
 911 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 912 {
 913         acpi_status status;
 914         acpi_handle tmp;
 915         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 916         union acpi_object *obj;
 917
 918         status = acpi_get_handle(handle, "_EJD", &tmp);
 919         if (ACPI_FAILURE(status))
 920                 return status;
 921
 922         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 923         if (ACPI_SUCCESS(status)) {
 924                 obj = buffer.pointer;
 925                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 926                                          ejd);
 927                 kfree(buffer.pointer);
 928         }
 929         return status;
 930 }
 931 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 932
 933 void acpi_bus_data_handler(acpi_handle handle, void *context)
 934 {
 935
 936         /* TBD */
 937
 938         return;
 939 }
 940
 941 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 942                                         struct acpi_device_wakeup *wakeup)
 943 {
 944         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 945         union acpi_object *package = NULL;
 946         union acpi_object *element = NULL;
 947         acpi_status status;
 948         int err = -ENODATA;
 949
 950         if (!wakeup)
 951                 return -EINVAL;
 952
 953         INIT_LIST_HEAD(&wakeup->resources);
 954
 955         /* _PRW */
 956         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 957         if (ACPI_FAILURE(status)) {
 958                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 959                 return err;
 960         }
 961
 962         package = (union acpi_object *)buffer.pointer;
 963
 964         if (!package || package->package.count < 2)
 965                 goto out;
 966
 967         element = &(package->package.elements[0]);
 968         if (!element)
 969                 goto out;
 970
 971         if (element->type == ACPI_TYPE_PACKAGE) {
 972                 if ((element->package.count < 2) ||
 973                     (element->package.elements[0].type !=
 974                      ACPI_TYPE_LOCAL_REFERENCE)
 975                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 976                         goto out;
 977
 978                 wakeup->gpe_device =
 979                     element->package.elements[0].reference.handle;
 980                 wakeup->gpe_number =
 981                     (u32) element->package.elements[1].integer.value;
 982         } else if (element->type == ACPI_TYPE_INTEGER) {
 983                 wakeup->gpe_device = NULL;
 984                 wakeup->gpe_number = element->integer.value;
 985         } else {
 986                 goto out;
 987         }
 988
 989         element = &(package->package.elements[1]);
 990         if (element->type != ACPI_TYPE_INTEGER)
 991                 goto out;
 992
 993         wakeup->sleep_state = element->integer.value;
 994
 995         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 996         if (err)
 997                 goto out;
 998
 999         if (!list_empty(&wakeup->resources)) {
1000                 int sleep_state;
1001
1002                 sleep_state = acpi_power_min_system_level(&wakeup->resources);
1003                 if (sleep_state < wakeup->sleep_state) {
1004                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
1005                                          "(S%d) by S%d from power resources\n",
1006                                          (int)wakeup->sleep_state, sleep_state);
1007                         wakeup->sleep_state = sleep_state;
1008                 }
1009         }
1010         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1011
1012  out:
1013         kfree(buffer.pointer);
1014         return err;
1015 }
1016
1017 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1018 {
1019         struct acpi_device_id button_device_ids[] = {
1020                 {"PNP0C0C", 0},
1021                 {"PNP0C0D", 0},
1022                 {"PNP0C0E", 0},
1023                 {"", 0},
1024         };
1025         acpi_status status;
1026         acpi_event_status event_status;
1027
1028         device->wakeup.flags.notifier_present = 0;
1029
1030         /* Power button, Lid switch always enable wakeup */
1031         if (!acpi_match_device_ids(device, button_device_ids)) {
1032                 device->wakeup.flags.run_wake = 1;
1033                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1034                         /* Do not use Lid/sleep button for S5 wakeup */
1035                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
1036                                 device->wakeup.sleep_state = ACPI_STATE_S4;
1037                 }
1038                 device_set_wakeup_capable(&device->dev, true);
1039                 return;
1040         }
1041
1042         status = acpi_get_gpe_status(device->wakeup.gpe_device,
1043                                         device->wakeup.gpe_number,
1044                                                 &event_status);
1045         if (status == AE_OK)
1046                 device->wakeup.flags.run_wake =
1047                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1048 }
1049
1050 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1051 {
1052         acpi_handle temp;
1053         acpi_status status = 0;
1054         int err;
1055
1056         /* Presence of _PRW indicates wake capable */
1057         status = acpi_get_handle(device->handle, "_PRW", &temp);
1058         if (ACPI_FAILURE(status))
1059                 return;
1060
1061         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1062                                                            &device->wakeup);
1063         if (err) {
1064                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1065                 return;
1066         }
1067
1068         device->wakeup.flags.valid = 1;
1069         device->wakeup.prepare_count = 0;
1070         acpi_bus_set_run_wake_flags(device);
1071         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1072          * system for the ACPI device with the _PRW object.
1073          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1074          * So it is necessary to call _DSW object first. Only when it is not
1075          * present will the _PSW object used.
1076          */
1077         err = acpi_device_sleep_wake(device, 0, 0, 0);
1078         if (err)
1079                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1080                                 "error in _DSW or _PSW evaluation\n"));
1081 }
1082
1083 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1084 {
1085         struct acpi_device_power_state *ps = &device->power.states[state];
1086         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1087         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1088         acpi_handle handle;
1089         acpi_status status;
1090
1091         INIT_LIST_HEAD(&ps->resources);
1092
1093         /* Evaluate "_PRx" to get referenced power resources */
1094         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1095         if (ACPI_SUCCESS(status)) {
1096                 union acpi_object *package = buffer.pointer;
1097
1098                 if (buffer.length && package
1099                     && package->type == ACPI_TYPE_PACKAGE
1100                     && package->package.count) {
1101                         int err = acpi_extract_power_resources(package, 0,
1102                                                                &ps->resources);
1103                         if (!err)
1104                                 device->power.flags.power_resources = 1;
1105                 }
1106                 ACPI_FREE(buffer.pointer);
1107         }
1108
1109         /* Evaluate "_PSx" to see if we can do explicit sets */
1110         pathname[2] = 'S';
1111         status = acpi_get_handle(device->handle, pathname, &handle);
1112         if (ACPI_SUCCESS(status))
1113                 ps->flags.explicit_set = 1;
1114
1115         /*
1116          * State is valid if there are means to put the device into it.
1117          * D3hot is only valid if _PR3 present.
1118          */
1119         if (!list_empty(&ps->resources)
1120             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1121                 ps->flags.valid = 1;
1122                 ps->flags.os_accessible = 1;
1123         }
1124
1125         ps->power = -1;         /* Unknown - driver assigned */
1126         ps->latency = -1;       /* Unknown - driver assigned */
1127 }
1128
1129 static void acpi_bus_get_power_flags(struct acpi_device *device)
1130 {
1131         acpi_status status;
1132         acpi_handle handle;
1133         u32 i;
1134
1135         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1136         status = acpi_get_handle(device->handle, "_PS0", &handle);
1137         if (ACPI_FAILURE(status)) {
1138                 status = acpi_get_handle(device->handle, "_PR0", &handle);
1139                 if (ACPI_FAILURE(status))
1140                         return;
1141         }
1142
1143         device->flags.power_manageable = 1;
1144
1145         /*
1146          * Power Management Flags
1147          */
1148         status = acpi_get_handle(device->handle, "_PSC", &handle);
1149         if (ACPI_SUCCESS(status))
1150                 device->power.flags.explicit_get = 1;
1151         status = acpi_get_handle(device->handle, "_IRC", &handle);
1152         if (ACPI_SUCCESS(status))
1153                 device->power.flags.inrush_current = 1;
1154
1155         /*
1156          * Enumerate supported power management states
1157          */
1158         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1159                 acpi_bus_init_power_state(device, i);
1160
1161         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1162
1163         /* Set defaults for D0 and D3 states (always valid) */
1164         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1165         device->power.states[ACPI_STATE_D0].power = 100;
1166         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1167         device->power.states[ACPI_STATE_D3].power = 0;
1168
1169         /* Set D3cold's explicit_set flag if _PS3 exists. */
1170         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1171                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1172
1173         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1174         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1175                         device->power.flags.power_resources)
1176                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1177
1178         acpi_bus_init_power(device);
1179 }
1180
1181 static void acpi_bus_get_flags(struct acpi_device *device)
1182 {
1183         acpi_status status = AE_OK;
1184         acpi_handle temp = NULL;
1185
1186         /* Presence of _STA indicates 'dynamic_status' */
1187         status = acpi_get_handle(device->handle, "_STA", &temp);
1188         if (ACPI_SUCCESS(status))
1189                 device->flags.dynamic_status = 1;
1190
1191         /* Presence of _RMV indicates 'removable' */
1192         status = acpi_get_handle(device->handle, "_RMV", &temp);
1193         if (ACPI_SUCCESS(status))
1194                 device->flags.removable = 1;
1195
1196         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1197         status = acpi_get_handle(device->handle, "_EJD", &temp);
1198         if (ACPI_SUCCESS(status))
1199                 device->flags.ejectable = 1;
1200         else {
1201                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1202                 if (ACPI_SUCCESS(status))
1203                         device->flags.ejectable = 1;
1204         }
1205 }
1206
1207 static void acpi_device_get_busid(struct acpi_device *device)
1208 {
1209         char bus_id[5] = { '?', 0 };
1210         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1211         int i = 0;
1212
1213         /*
1214          * Bus ID
1215          * ------
1216          * The device's Bus ID is simply the object name.
1217          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1218          */
1219         if (ACPI_IS_ROOT_DEVICE(device)) {
1220                 strcpy(device->pnp.bus_id, "ACPI");
1221                 return;
1222         }
1223
1224         switch (device->device_type) {
1225         case ACPI_BUS_TYPE_POWER_BUTTON:
1226                 strcpy(device->pnp.bus_id, "PWRF");
1227                 break;
1228         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1229                 strcpy(device->pnp.bus_id, "SLPF");
1230                 break;
1231         default:
1232                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1233                 /* Clean up trailing underscores (if any) */
1234                 for (i = 3; i > 1; i--) {
1235                         if (bus_id[i] == '_')
1236                                 bus_id[i] = '\0';
1237                         else
1238                                 break;
1239                 }
1240                 strcpy(device->pnp.bus_id, bus_id);
1241                 break;
1242         }
1243 }
1244
1245 /*
1246  * acpi_bay_match - see if a device is an ejectable driver bay
1247  *
1248  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1249  * then we can safely call it an ejectable drive bay
1250  */
1251 static int acpi_bay_match(struct acpi_device *device){
1252         acpi_status status;
1253         acpi_handle handle;
1254         acpi_handle tmp;
1255         acpi_handle phandle;
1256
1257         handle = device->handle;
1258
1259         status = acpi_get_handle(handle, "_EJ0", &tmp);
1260         if (ACPI_FAILURE(status))
1261                 return -ENODEV;
1262
1263         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1264                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1265                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1266                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1267                 return 0;
1268
1269         if (acpi_get_parent(handle, &phandle))
1270                 return -ENODEV;
1271
1272         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1273                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1274                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1275                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1276                 return 0;
1277
1278         return -ENODEV;
1279 }
1280
1281 /*
1282  * acpi_dock_match - see if a device has a _DCK method
1283  */
1284 static int acpi_dock_match(struct acpi_device *device)
1285 {
1286         acpi_handle tmp;
1287         return acpi_get_handle(device->handle, "_DCK", &tmp);
1288 }
1289
1290 const char *acpi_device_hid(struct acpi_device *device)
1291 {
1292         struct acpi_hardware_id *hid;
1293
1294         if (list_empty(&device->pnp.ids))
1295                 return dummy_hid;
1296
1297         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1298         return hid->id;
1299 }
1300 EXPORT_SYMBOL(acpi_device_hid);
1301
1302 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1303 {
1304         struct acpi_hardware_id *id;
1305
1306         id = kmalloc(sizeof(*id), GFP_KERNEL);
1307         if (!id)
1308                 return;
1309
1310         id->id = kstrdup(dev_id, GFP_KERNEL);
1311         if (!id->id) {
1312                 kfree(id);
1313                 return;
1314         }
1315
1316         list_add_tail(&id->list, &device->pnp.ids);
1317 }
1318
1319 /*
1320  * Old IBM workstations have a DSDT bug wherein the SMBus object
1321  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1322  * prefix.  Work around this.
1323  */
1324 static int acpi_ibm_smbus_match(struct acpi_device *device)
1325 {
1326         acpi_handle h_dummy;
1327         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1328         int result;
1329
1330         if (!dmi_name_in_vendors("IBM"))
1331                 return -ENODEV;
1332
1333         /* Look for SMBS object */
1334         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1335         if (result)
1336                 return result;
1337
1338         if (strcmp("SMBS", path.pointer)) {
1339                 result = -ENODEV;
1340                 goto out;
1341         }
1342
1343         /* Does it have the necessary (but misnamed) methods? */
1344         result = -ENODEV;
1345         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1346             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1347             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1348                 result = 0;
1349 out:
1350         kfree(path.pointer);
1351         return result;
1352 }
1353
1354 static void acpi_device_set_id(struct acpi_device *device)
1355 {
1356         acpi_status status;
1357         struct acpi_device_info *info;
1358         struct acpi_pnp_device_id_list *cid_list;
1359         int i;
1360
1361         switch (device->device_type) {
1362         case ACPI_BUS_TYPE_DEVICE:
1363                 if (ACPI_IS_ROOT_DEVICE(device)) {
1364                         acpi_add_id(device, ACPI_SYSTEM_HID);
1365                         break;
1366                 }
1367
1368                 status = acpi_get_object_info(device->handle, &info);
1369                 if (ACPI_FAILURE(status)) {
1370                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1371                         return;
1372                 }
1373
1374                 if (info->valid & ACPI_VALID_HID)
1375                         acpi_add_id(device, info->hardware_id.string);
1376                 if (info->valid & ACPI_VALID_CID) {
1377                         cid_list = &info->compatible_id_list;
1378                         for (i = 0; i < cid_list->count; i++)
1379                                 acpi_add_id(device, cid_list->ids[i].string);
1380                 }
1381                 if (info->valid & ACPI_VALID_ADR) {
1382                         device->pnp.bus_address = info->address;
1383                         device->flags.bus_address = 1;
1384                 }
1385                 if (info->valid & ACPI_VALID_UID)
1386                         device->pnp.unique_id = kstrdup(info->unique_id.string,
1387                                                         GFP_KERNEL);
1388
1389                 kfree(info);
1390
1391                 /*
1392                  * Some devices don't reliably have _HIDs & _CIDs, so add
1393                  * synthetic HIDs to make sure drivers can find them.
1394                  */
1395                 if (acpi_is_video_device(device))
1396                         acpi_add_id(device, ACPI_VIDEO_HID);
1397                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1398                         acpi_add_id(device, ACPI_BAY_HID);
1399                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1400                         acpi_add_id(device, ACPI_DOCK_HID);
1401                 else if (!acpi_ibm_smbus_match(device))
1402                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1403                 else if (list_empty(&device->pnp.ids) &&
1404                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1405                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1406                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1407                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1408                 }
1409
1410                 break;
1411         case ACPI_BUS_TYPE_POWER:
1412                 acpi_add_id(device, ACPI_POWER_HID);
1413                 break;
1414         case ACPI_BUS_TYPE_PROCESSOR:
1415                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1416                 break;
1417         case ACPI_BUS_TYPE_THERMAL:
1418                 acpi_add_id(device, ACPI_THERMAL_HID);
1419                 break;
1420         case ACPI_BUS_TYPE_POWER_BUTTON:
1421                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1422                 break;
1423         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1424                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1425                 break;
1426         }
1427 }
1428
1429 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1430                              int type, unsigned long long sta)
1431 {
1432         INIT_LIST_HEAD(&device->pnp.ids);
1433         device->device_type = type;
1434         device->handle = handle;
1435         device->parent = acpi_bus_get_parent(handle);
1436         STRUCT_TO_INT(device->status) = sta;
1437         acpi_device_get_busid(device);
1438         acpi_device_set_id(device);
1439         acpi_bus_get_flags(device);
1440         device->flags.match_driver = false;
1441         device_initialize(&device->dev);
1442         dev_set_uevent_suppress(&device->dev, true);
1443 }
1444
1445 void acpi_device_add_finalize(struct acpi_device *device)
1446 {
1447         device->flags.match_driver = true;
1448         dev_set_uevent_suppress(&device->dev, false);
1449         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1450 }
1451
1452 static int acpi_add_single_object(struct acpi_device **child,
1453                                   acpi_handle handle, int type,
1454                                   unsigned long long sta)
1455 {
1456         int result;
1457         struct acpi_device *device;
1458         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1459
1460         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1461         if (!device) {
1462                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1463                 return -ENOMEM;
1464         }
1465
1466         acpi_init_device_object(device, handle, type, sta);
1467         acpi_bus_get_power_flags(device);
1468         acpi_bus_get_wakeup_device_flags(device);
1469
1470         result = acpi_device_add(device, acpi_device_release);
1471         if (result) {
1472                 acpi_device_release(&device->dev);
1473                 return result;
1474         }
1475
1476         acpi_power_add_remove_device(device, true);
1477         acpi_device_add_finalize(device);
1478         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1479         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1480                 dev_name(&device->dev), (char *) buffer.pointer,
1481                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1482         kfree(buffer.pointer);
1483         *child = device;
1484         return 0;
1485 }
1486
1487 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1488                                     unsigned long long *sta)
1489 {
1490         acpi_status status;
1491         acpi_object_type acpi_type;
1492
1493         status = acpi_get_type(handle, &acpi_type);
1494         if (ACPI_FAILURE(status))
1495                 return -ENODEV;
1496
1497         switch (acpi_type) {
1498         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1499         case ACPI_TYPE_DEVICE:
1500                 *type = ACPI_BUS_TYPE_DEVICE;
1501                 status = acpi_bus_get_status_handle(handle, sta);
1502                 if (ACPI_FAILURE(status))
1503                         return -ENODEV;
1504                 break;
1505         case ACPI_TYPE_PROCESSOR:
1506                 *type = ACPI_BUS_TYPE_PROCESSOR;
1507                 status = acpi_bus_get_status_handle(handle, sta);
1508                 if (ACPI_FAILURE(status))
1509                         return -ENODEV;
1510                 break;
1511         case ACPI_TYPE_THERMAL:
1512                 *type = ACPI_BUS_TYPE_THERMAL;
1513                 *sta = ACPI_STA_DEFAULT;
1514                 break;
1515         case ACPI_TYPE_POWER:
1516                 *type = ACPI_BUS_TYPE_POWER;
1517                 *sta = ACPI_STA_DEFAULT;
1518                 break;
1519         default:
1520                 return -ENODEV;
1521         }
1522
1523         return 0;
1524 }
1525
1526 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1527                                       void *not_used, void **return_value)
1528 {
1529         struct acpi_device *device = NULL;
1530         int type;
1531         unsigned long long sta;
1532         acpi_status status;
1533         int result;
1534
1535         acpi_bus_get_device(handle, &device);
1536         if (device)
1537                 goto out;
1538
1539         result = acpi_bus_type_and_status(handle, &type, &sta);
1540         if (result)
1541                 return AE_OK;
1542
1543         if (type == ACPI_BUS_TYPE_POWER) {
1544                 acpi_add_power_resource(handle);
1545                 return AE_OK;
1546         }
1547
1548         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1549             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1550                 struct acpi_device_wakeup wakeup;
1551                 acpi_handle temp;
1552
1553                 status = acpi_get_handle(handle, "_PRW", &temp);
1554                 if (ACPI_SUCCESS(status)) {
1555                         acpi_bus_extract_wakeup_device_power_package(handle,
1556                                                                      &wakeup);
1557                         acpi_power_resources_list_free(&wakeup.resources);
1558                 }
1559                 return AE_CTRL_DEPTH;
1560         }
1561
1562         acpi_add_single_object(&device, handle, type, sta);
1563         if (!device)
1564                 return AE_CTRL_DEPTH;
1565
1566  out:
1567         if (!*return_value)
1568                 *return_value = device;
1569
1570         return AE_OK;
1571 }
1572
1573 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1574                                           void *not_used, void **ret_not_used)
1575 {
1576         acpi_status status = AE_OK;
1577         struct acpi_device *device;
1578         unsigned long long sta_not_used;
1579         int type_not_used;
1580
1581         /*
1582          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1583          * namespace walks prematurely.
1584          */
1585         if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
1586                 return AE_OK;
1587
1588         if (acpi_bus_get_device(handle, &device))
1589                 return AE_CTRL_DEPTH;
1590
1591         if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
1592                 /* This is a known good platform device. */
1593                 acpi_create_platform_device(device);
1594         } else if (device_attach(&device->dev) < 0) {
1595                 status = AE_CTRL_DEPTH;
1596         }
1597         return status;
1598 }
1599
1600 /**
1601  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1602  * @handle: Root of the namespace scope to scan.
1603  *
1604  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1605  * found devices.
1606  *
1607  * If no devices were found, -ENODEV is returned, but it does not mean that
1608  * there has been a real error.  There just have been no suitable ACPI objects
1609  * in the table trunk from which the kernel could create a device and add an
1610  * appropriate driver.
1611  */
1612 int acpi_bus_scan(acpi_handle handle)
1613 {
1614         void *device = NULL;
1615         int error = 0;
1616
1617         mutex_lock(&acpi_scan_lock);
1618
1619         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1620                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1621                                     acpi_bus_check_add, NULL, NULL, &device);
1622
1623         if (!device)
1624                 error = -ENODEV;
1625         else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1626                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1627                                     acpi_bus_device_attach, NULL, NULL, NULL);
1628
1629         mutex_unlock(&acpi_scan_lock);
1630         return error;
1631 }
1632 EXPORT_SYMBOL(acpi_bus_scan);
1633
1634 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1635                                           void *not_used, void **ret_not_used)
1636 {
1637         struct acpi_device *device = NULL;
1638
1639         if (!acpi_bus_get_device(handle, &device)) {
1640                 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1641                 device_release_driver(&device->dev);
1642         }
1643         return AE_OK;
1644 }
1645
1646 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1647                                    void *not_used, void **ret_not_used)
1648 {
1649         struct acpi_device *device = NULL;
1650
1651         if (!acpi_bus_get_device(handle, &device))
1652                 acpi_device_unregister(device);
1653
1654         return AE_OK;
1655 }
1656
1657 void acpi_bus_trim(struct acpi_device *start)
1658 {
1659         mutex_lock(&acpi_scan_lock);
1660
1661         /*
1662          * Execute acpi_bus_device_detach() as a post-order callback to detach
1663          * all ACPI drivers from the device nodes being removed.
1664          */
1665         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1666                             acpi_bus_device_detach, NULL, NULL);
1667         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1668         /*
1669          * Execute acpi_bus_remove() as a post-order callback to remove device
1670          * nodes in the given namespace scope.
1671          */
1672         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1673                             acpi_bus_remove, NULL, NULL);
1674         acpi_bus_remove(start->handle, 0, NULL, NULL);
1675
1676         mutex_unlock(&acpi_scan_lock);
1677 }
1678 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1679
1680 static int acpi_bus_scan_fixed(void)
1681 {
1682         int result = 0;
1683
1684         /*
1685          * Enumerate all fixed-feature devices.
1686          */
1687         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1688                 struct acpi_device *device = NULL;
1689
1690                 result = acpi_add_single_object(&device, NULL,
1691                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1692                                                 ACPI_STA_DEFAULT);
1693                 if (result)
1694                         return result;
1695
1696                 result = device_attach(&device->dev);
1697                 if (result < 0)
1698                         return result;
1699
1700                 device_init_wakeup(&device->dev, true);
1701         }
1702
1703         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1704                 struct acpi_device *device = NULL;
1705
1706                 result = acpi_add_single_object(&device, NULL,
1707                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1708                                                 ACPI_STA_DEFAULT);
1709                 if (result)
1710                         return result;
1711
1712                 result = device_attach(&device->dev);
1713         }
1714
1715         return result < 0 ? result : 0;
1716 }
1717
1718 int __init acpi_scan_init(void)
1719 {
1720         int result;
1721
1722         result = bus_register(&acpi_bus_type);
1723         if (result) {
1724                 /* We don't want to quit even if we failed to add suspend/resume */
1725                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1726         }
1727
1728         acpi_pci_root_init();
1729
1730         /*
1731          * Enumerate devices in the ACPI namespace.
1732          */
1733         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1734         if (result)
1735                 return result;
1736
1737         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1738         if (result)
1739                 return result;
1740
1741         result = acpi_bus_scan_fixed();
1742         if (result) {
1743                 acpi_device_unregister(acpi_root);
1744                 return result;
1745         }
1746
1747         acpi_update_all_gpes();
1748         return 0;
1749 }