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 static LIST_HEAD(acpi_device_list);
  33 static LIST_HEAD(acpi_bus_id_list);
  34 static DEFINE_MUTEX(acpi_scan_lock);
  35 static LIST_HEAD(acpi_scan_handlers_list);
  36 DEFINE_MUTEX(acpi_device_lock);
  37 LIST_HEAD(acpi_wakeup_device_list);
  38
  39 struct acpi_device_bus_id{
  40         char bus_id[15];
  41         unsigned int instance_no;
  42         struct list_head node;
  43 };
  44
  45 void acpi_scan_lock_acquire(void)
  46 {
  47         mutex_lock(&acpi_scan_lock);
  48 }
  49 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  50
  51 void acpi_scan_lock_release(void)
  52 {
  53         mutex_unlock(&acpi_scan_lock);
  54 }
  55 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  56
  57 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  58 {
  59         if (!handler || !handler->attach)
  60                 return -EINVAL;
  61
  62         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  63         return 0;
  64 }
  65
  66 /*
  67  * Creates hid/cid(s) string needed for modalias and uevent
  68  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  69  * char *modalias: "acpi:IBM0001:ACPI0001"
  70 */
  71 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  72                            int size)
  73 {
  74         int len;
  75         int count;
  76         struct acpi_hardware_id *id;
  77
  78         if (list_empty(&acpi_dev->pnp.ids))
  79                 return 0;
  80
  81         len = snprintf(modalias, size, "acpi:");
  82         size -= len;
  83
  84         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
  85                 count = snprintf(&modalias[len], size, "%s:", id->id);
  86                 if (count < 0 || count >= size)
  87                         return -EINVAL;
  88                 len += count;
  89                 size -= count;
  90         }
  91
  92         modalias[len] = '\0';
  93         return len;
  94 }
  95
  96 static ssize_t
  97 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  98         struct acpi_device *acpi_dev = to_acpi_device(dev);
  99         int len;
 100
 101         /* Device has no HID and no CID or string is >1024 */
 102         len = create_modalias(acpi_dev, buf, 1024);
 103         if (len <= 0)
 104                 return 0;
 105         buf[len++] = '\n';
 106         return len;
 107 }
 108 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 109
 110 /**
 111  * acpi_bus_hot_remove_device: hot-remove a device and its children
 112  * @context: struct acpi_eject_event pointer (freed in this func)
 113  *
 114  * Hot-remove a device and its children. This function frees up the
 115  * memory space passed by arg context, so that the caller may call
 116  * this function asynchronously through acpi_os_hotplug_execute().
 117  */
 118 void acpi_bus_hot_remove_device(void *context)
 119 {
 120         struct acpi_eject_event *ej_event = context;
 121         struct acpi_device *device = ej_event->device;
 122         acpi_handle handle = device->handle;
 123         acpi_handle temp;
 124         struct acpi_object_list arg_list;
 125         union acpi_object arg;
 126         acpi_status status = AE_OK;
 127         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 128
 129         mutex_lock(&acpi_scan_lock);
 130
 131         /* If there is no handle, the device node has been unregistered. */
 132         if (!device->handle) {
 133                 dev_dbg(&device->dev, "ACPI handle missing\n");
 134                 put_device(&device->dev);
 135                 goto out;
 136         }
 137
 138         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 139                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 140
 141         acpi_bus_trim(device);
 142         /* Device node has been unregistered. */
 143         put_device(&device->dev);
 144         device = NULL;
 145
 146         if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
 147                 arg_list.count = 1;
 148                 arg_list.pointer = &arg;
 149                 arg.type = ACPI_TYPE_INTEGER;
 150                 arg.integer.value = 0;
 151                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 152         }
 153
 154         arg_list.count = 1;
 155         arg_list.pointer = &arg;
 156         arg.type = ACPI_TYPE_INTEGER;
 157         arg.integer.value = 1;
 158
 159         /*
 160          * TBD: _EJD support.
 161          */
 162         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 163         if (ACPI_FAILURE(status)) {
 164                 if (status != AE_NOT_FOUND)
 165                         acpi_handle_warn(handle, "Eject failed\n");
 166
 167                 /* Tell the firmware the hot-remove operation has failed. */
 168                 acpi_evaluate_hotplug_ost(handle, ej_event->event,
 169                                           ost_code, NULL);
 170         }
 171
 172  out:
 173         mutex_unlock(&acpi_scan_lock);
 174         kfree(context);
 175         return;
 176 }
 177 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 178
 179 static ssize_t real_power_state_show(struct device *dev,
 180                                      struct device_attribute *attr, char *buf)
 181 {
 182         struct acpi_device *adev = to_acpi_device(dev);
 183         int state;
 184         int ret;
 185
 186         ret = acpi_device_get_power(adev, &state);
 187         if (ret)
 188                 return ret;
 189
 190         return sprintf(buf, "%s\n", acpi_power_state_string(state));
 191 }
 192
 193 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 194
 195 static ssize_t power_state_show(struct device *dev,
 196                                 struct device_attribute *attr, char *buf)
 197 {
 198         struct acpi_device *adev = to_acpi_device(dev);
 199
 200         return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 201 }
 202
 203 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 204
 205 static ssize_t
 206 acpi_eject_store(struct device *d, struct device_attribute *attr,
 207                 const char *buf, size_t count)
 208 {
 209         int ret = count;
 210         acpi_status status;
 211         acpi_object_type type = 0;
 212         struct acpi_device *acpi_device = to_acpi_device(d);
 213         struct acpi_eject_event *ej_event;
 214
 215         if ((!count) || (buf[0] != '1')) {
 216                 return -EINVAL;
 217         }
 218         if (!acpi_device->driver && !acpi_device->handler) {
 219                 ret = -ENODEV;
 220                 goto err;
 221         }
 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         get_device(&acpi_device->dev);
 235         ej_event->device = acpi_device;
 236         if (acpi_device->flags.eject_pending) {
 237                 /* event originated from ACPI eject notification */
 238                 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
 239                 acpi_device->flags.eject_pending = 0;
 240         } else {
 241                 /* event originated from user */
 242                 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
 243                 (void) acpi_evaluate_hotplug_ost(acpi_device->handle,
 244                         ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 245         }
 246
 247         status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
 248         if (ACPI_FAILURE(status)) {
 249                 put_device(&acpi_device->dev);
 250                 kfree(ej_event);
 251         }
 252 err:
 253         return ret;
 254 }
 255
 256 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 257
 258 static ssize_t
 259 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 260         struct acpi_device *acpi_dev = to_acpi_device(dev);
 261
 262         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 263 }
 264 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 265
 266 static ssize_t acpi_device_uid_show(struct device *dev,
 267                                     struct device_attribute *attr, char *buf)
 268 {
 269         struct acpi_device *acpi_dev = to_acpi_device(dev);
 270
 271         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 272 }
 273 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 274
 275 static ssize_t acpi_device_adr_show(struct device *dev,
 276                                     struct device_attribute *attr, char *buf)
 277 {
 278         struct acpi_device *acpi_dev = to_acpi_device(dev);
 279
 280         return sprintf(buf, "0x%08x\n",
 281                        (unsigned int)(acpi_dev->pnp.bus_address));
 282 }
 283 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 284
 285 static ssize_t
 286 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 287         struct acpi_device *acpi_dev = to_acpi_device(dev);
 288         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 289         int result;
 290
 291         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 292         if (result)
 293                 goto end;
 294
 295         result = sprintf(buf, "%s\n", (char*)path.pointer);
 296         kfree(path.pointer);
 297 end:
 298         return result;
 299 }
 300 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 301
 302 /* sysfs file that shows description text from the ACPI _STR method */
 303 static ssize_t description_show(struct device *dev,
 304                                 struct device_attribute *attr,
 305                                 char *buf) {
 306         struct acpi_device *acpi_dev = to_acpi_device(dev);
 307         int result;
 308
 309         if (acpi_dev->pnp.str_obj == NULL)
 310                 return 0;
 311
 312         /*
 313          * The _STR object contains a Unicode identifier for a device.
 314          * We need to convert to utf-8 so it can be displayed.
 315          */
 316         result = utf16s_to_utf8s(
 317                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 318                 acpi_dev->pnp.str_obj->buffer.length,
 319                 UTF16_LITTLE_ENDIAN, buf,
 320                 PAGE_SIZE);
 321
 322         buf[result++] = '\n';
 323
 324         return result;
 325 }
 326 static DEVICE_ATTR(description, 0444, description_show, NULL);
 327
 328 static ssize_t
 329 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 330                      char *buf) {
 331         struct acpi_device *acpi_dev = to_acpi_device(dev);
 332
 333         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 334 }
 335 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 336
 337 static int acpi_device_setup_files(struct acpi_device *dev)
 338 {
 339         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 340         acpi_status status;
 341         acpi_handle temp;
 342         unsigned long long sun;
 343         int result = 0;
 344
 345         /*
 346          * Devices gotten from FADT don't have a "path" attribute
 347          */
 348         if (dev->handle) {
 349                 result = device_create_file(&dev->dev, &dev_attr_path);
 350                 if (result)
 351                         goto end;
 352         }
 353
 354         if (!list_empty(&dev->pnp.ids)) {
 355                 result = device_create_file(&dev->dev, &dev_attr_hid);
 356                 if (result)
 357                         goto end;
 358
 359                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 360                 if (result)
 361                         goto end;
 362         }
 363
 364         /*
 365          * If device has _STR, 'description' file is created
 366          */
 367         status = acpi_get_handle(dev->handle, "_STR", &temp);
 368         if (ACPI_SUCCESS(status)) {
 369                 status = acpi_evaluate_object(dev->handle, "_STR",
 370                                         NULL, &buffer);
 371                 if (ACPI_FAILURE(status))
 372                         buffer.pointer = NULL;
 373                 dev->pnp.str_obj = buffer.pointer;
 374                 result = device_create_file(&dev->dev, &dev_attr_description);
 375                 if (result)
 376                         goto end;
 377         }
 378
 379         if (dev->flags.bus_address)
 380                 result = device_create_file(&dev->dev, &dev_attr_adr);
 381         if (dev->pnp.unique_id)
 382                 result = device_create_file(&dev->dev, &dev_attr_uid);
 383
 384         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 385         if (ACPI_SUCCESS(status)) {
 386                 dev->pnp.sun = (unsigned long)sun;
 387                 result = device_create_file(&dev->dev, &dev_attr_sun);
 388                 if (result)
 389                         goto end;
 390         } else {
 391                 dev->pnp.sun = (unsigned long)-1;
 392         }
 393
 394         /*
 395          * If device has _EJ0, 'eject' file is created that is used to trigger
 396          * hot-removal function from userland.
 397          */
 398         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 399         if (ACPI_SUCCESS(status)) {
 400                 result = device_create_file(&dev->dev, &dev_attr_eject);
 401                 if (result)
 402                         return result;
 403         }
 404
 405         if (dev->flags.power_manageable) {
 406                 result = device_create_file(&dev->dev, &dev_attr_power_state);
 407                 if (result)
 408                         return result;
 409
 410                 if (dev->power.flags.power_resources)
 411                         result = device_create_file(&dev->dev,
 412                                                     &dev_attr_real_power_state);
 413         }
 414
 415 end:
 416         return result;
 417 }
 418
 419 static void acpi_device_remove_files(struct acpi_device *dev)
 420 {
 421         acpi_status status;
 422         acpi_handle temp;
 423
 424         if (dev->flags.power_manageable) {
 425                 device_remove_file(&dev->dev, &dev_attr_power_state);
 426                 if (dev->power.flags.power_resources)
 427                         device_remove_file(&dev->dev,
 428                                            &dev_attr_real_power_state);
 429         }
 430
 431         /*
 432          * If device has _STR, remove 'description' file
 433          */
 434         status = acpi_get_handle(dev->handle, "_STR", &temp);
 435         if (ACPI_SUCCESS(status)) {
 436                 kfree(dev->pnp.str_obj);
 437                 device_remove_file(&dev->dev, &dev_attr_description);
 438         }
 439         /*
 440          * If device has _EJ0, remove 'eject' file.
 441          */
 442         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 443         if (ACPI_SUCCESS(status))
 444                 device_remove_file(&dev->dev, &dev_attr_eject);
 445
 446         status = acpi_get_handle(dev->handle, "_SUN", &temp);
 447         if (ACPI_SUCCESS(status))
 448                 device_remove_file(&dev->dev, &dev_attr_sun);
 449
 450         if (dev->pnp.unique_id)
 451                 device_remove_file(&dev->dev, &dev_attr_uid);
 452         if (dev->flags.bus_address)
 453                 device_remove_file(&dev->dev, &dev_attr_adr);
 454         device_remove_file(&dev->dev, &dev_attr_modalias);
 455         device_remove_file(&dev->dev, &dev_attr_hid);
 456         if (dev->handle)
 457                 device_remove_file(&dev->dev, &dev_attr_path);
 458 }
 459 /* --------------------------------------------------------------------------
 460                         ACPI Bus operations
 461    -------------------------------------------------------------------------- */
 462
 463 static const struct acpi_device_id *__acpi_match_device(
 464         struct acpi_device *device, const struct acpi_device_id *ids)
 465 {
 466         const struct acpi_device_id *id;
 467         struct acpi_hardware_id *hwid;
 468
 469         /*
 470          * If the device is not present, it is unnecessary to load device
 471          * driver for it.
 472          */
 473         if (!device->status.present)
 474                 return NULL;
 475
 476         for (id = ids; id->id[0]; id++)
 477                 list_for_each_entry(hwid, &device->pnp.ids, list)
 478                         if (!strcmp((char *) id->id, hwid->id))
 479                                 return id;
 480
 481         return NULL;
 482 }
 483
 484 /**
 485  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 486  * @ids: Array of struct acpi_device_id object to match against.
 487  * @dev: The device structure to match.
 488  *
 489  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 490  * object for that handle and use that object to match against a given list of
 491  * device IDs.
 492  *
 493  * Return a pointer to the first matching ID on success or %NULL on failure.
 494  */
 495 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 496                                                const struct device *dev)
 497 {
 498         struct acpi_device *adev;
 499         acpi_handle handle = ACPI_HANDLE(dev);
 500
 501         if (!ids || !handle || acpi_bus_get_device(handle, &adev))
 502                 return NULL;
 503
 504         return __acpi_match_device(adev, ids);
 505 }
 506 EXPORT_SYMBOL_GPL(acpi_match_device);
 507
 508 int acpi_match_device_ids(struct acpi_device *device,
 509                           const struct acpi_device_id *ids)
 510 {
 511         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 512 }
 513 EXPORT_SYMBOL(acpi_match_device_ids);
 514
 515 void acpi_free_ids(struct acpi_device *device)
 516 {
 517         struct acpi_hardware_id *id, *tmp;
 518
 519         list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
 520                 kfree(id->id);
 521                 kfree(id);
 522         }
 523         kfree(device->pnp.unique_id);
 524 }
 525
 526 static void acpi_free_power_resources_lists(struct acpi_device *device)
 527 {
 528         int i;
 529
 530         if (device->wakeup.flags.valid)
 531                 acpi_power_resources_list_free(&device->wakeup.resources);
 532
 533         if (!device->flags.power_manageable)
 534                 return;
 535
 536         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 537                 struct acpi_device_power_state *ps = &device->power.states[i];
 538                 acpi_power_resources_list_free(&ps->resources);
 539         }
 540 }
 541
 542 static void acpi_device_release(struct device *dev)
 543 {
 544         struct acpi_device *acpi_dev = to_acpi_device(dev);
 545
 546         acpi_free_ids(acpi_dev);
 547         acpi_free_power_resources_lists(acpi_dev);
 548         kfree(acpi_dev);
 549 }
 550
 551 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 552 {
 553         struct acpi_device *acpi_dev = to_acpi_device(dev);
 554         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 555
 556         return acpi_dev->flags.match_driver
 557                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 558 }
 559
 560 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 561 {
 562         struct acpi_device *acpi_dev = to_acpi_device(dev);
 563         int len;
 564
 565         if (list_empty(&acpi_dev->pnp.ids))
 566                 return 0;
 567
 568         if (add_uevent_var(env, "MODALIAS="))
 569                 return -ENOMEM;
 570         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 571                               sizeof(env->buf) - env->buflen);
 572         if (len >= (sizeof(env->buf) - env->buflen))
 573                 return -ENOMEM;
 574         env->buflen += len;
 575         return 0;
 576 }
 577
 578 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 579 {
 580         struct acpi_device *device = data;
 581
 582         device->driver->ops.notify(device, event);
 583 }
 584
 585 static acpi_status acpi_device_notify_fixed(void *data)
 586 {
 587         struct acpi_device *device = data;
 588
 589         /* Fixed hardware devices have no handles */
 590         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 591         return AE_OK;
 592 }
 593
 594 static int acpi_device_install_notify_handler(struct acpi_device *device)
 595 {
 596         acpi_status status;
 597
 598         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 599                 status =
 600                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 601                                                      acpi_device_notify_fixed,
 602                                                      device);
 603         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 604                 status =
 605                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 606                                                      acpi_device_notify_fixed,
 607                                                      device);
 608         else
 609                 status = acpi_install_notify_handler(device->handle,
 610                                                      ACPI_DEVICE_NOTIFY,
 611                                                      acpi_device_notify,
 612                                                      device);
 613
 614         if (ACPI_FAILURE(status))
 615                 return -EINVAL;
 616         return 0;
 617 }
 618
 619 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 620 {
 621         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 622                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 623                                                 acpi_device_notify_fixed);
 624         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 625                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 626                                                 acpi_device_notify_fixed);
 627         else
 628                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 629                                            acpi_device_notify);
 630 }
 631
 632 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 633 static int acpi_device_probe(struct device * dev)
 634 {
 635         struct acpi_device *acpi_dev = to_acpi_device(dev);
 636         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 637         int ret;
 638
 639         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 640         if (!ret) {
 641                 if (acpi_drv->ops.notify) {
 642                         ret = acpi_device_install_notify_handler(acpi_dev);
 643                         if (ret) {
 644                                 if (acpi_drv->ops.remove)
 645                                         acpi_drv->ops.remove(acpi_dev);
 646                                 acpi_dev->driver = NULL;
 647                                 acpi_dev->driver_data = NULL;
 648                                 return ret;
 649                         }
 650                 }
 651
 652                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 653                         "Found driver [%s] for device [%s]\n",
 654                         acpi_drv->name, acpi_dev->pnp.bus_id));
 655                 get_device(dev);
 656         }
 657         return ret;
 658 }
 659
 660 static int acpi_device_remove(struct device * dev)
 661 {
 662         struct acpi_device *acpi_dev = to_acpi_device(dev);
 663         struct acpi_driver *acpi_drv = acpi_dev->driver;
 664
 665         if (acpi_drv) {
 666                 if (acpi_drv->ops.notify)
 667                         acpi_device_remove_notify_handler(acpi_dev);
 668                 if (acpi_drv->ops.remove)
 669                         acpi_drv->ops.remove(acpi_dev);
 670         }
 671         acpi_dev->driver = NULL;
 672         acpi_dev->driver_data = NULL;
 673
 674         put_device(dev);
 675         return 0;
 676 }
 677
 678 struct bus_type acpi_bus_type = {
 679         .name           = "acpi",
 680         .match          = acpi_bus_match,
 681         .probe          = acpi_device_probe,
 682         .remove         = acpi_device_remove,
 683         .uevent         = acpi_device_uevent,
 684 };
 685
 686 int acpi_device_add(struct acpi_device *device,
 687                     void (*release)(struct device *))
 688 {
 689         int result;
 690         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 691         int found = 0;
 692
 693         if (device->handle) {
 694                 acpi_status status;
 695
 696                 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
 697                                           device);
 698                 if (ACPI_FAILURE(status)) {
 699                         acpi_handle_err(device->handle,
 700                                         "Unable to attach device data\n");
 701                         return -ENODEV;
 702                 }
 703         }
 704
 705         /*
 706          * Linkage
 707          * -------
 708          * Link this device to its parent and siblings.
 709          */
 710         INIT_LIST_HEAD(&device->children);
 711         INIT_LIST_HEAD(&device->node);
 712         INIT_LIST_HEAD(&device->wakeup_list);
 713         INIT_LIST_HEAD(&device->physical_node_list);
 714         mutex_init(&device->physical_node_lock);
 715         INIT_LIST_HEAD(&device->power_dependent);
 716
 717         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 718         if (!new_bus_id) {
 719                 pr_err(PREFIX "Memory allocation error\n");
 720                 result = -ENOMEM;
 721                 goto err_detach;
 722         }
 723
 724         mutex_lock(&acpi_device_lock);
 725         /*
 726          * Find suitable bus_id and instance number in acpi_bus_id_list
 727          * If failed, create one and link it into acpi_bus_id_list
 728          */
 729         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 730                 if (!strcmp(acpi_device_bus_id->bus_id,
 731                             acpi_device_hid(device))) {
 732                         acpi_device_bus_id->instance_no++;
 733                         found = 1;
 734                         kfree(new_bus_id);
 735                         break;
 736                 }
 737         }
 738         if (!found) {
 739                 acpi_device_bus_id = new_bus_id;
 740                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 741                 acpi_device_bus_id->instance_no = 0;
 742                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 743         }
 744         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 745
 746         if (device->parent)
 747                 list_add_tail(&device->node, &device->parent->children);
 748
 749         if (device->wakeup.flags.valid)
 750                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 751         mutex_unlock(&acpi_device_lock);
 752
 753         if (device->parent)
 754                 device->dev.parent = &device->parent->dev;
 755         device->dev.bus = &acpi_bus_type;
 756         device->dev.release = release;
 757         result = device_add(&device->dev);
 758         if (result) {
 759                 dev_err(&device->dev, "Error registering device\n");
 760                 goto err;
 761         }
 762
 763         result = acpi_device_setup_files(device);
 764         if (result)
 765                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 766                        dev_name(&device->dev));
 767
 768         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 769         return 0;
 770
 771  err:
 772         mutex_lock(&acpi_device_lock);
 773         if (device->parent)
 774                 list_del(&device->node);
 775         list_del(&device->wakeup_list);
 776         mutex_unlock(&acpi_device_lock);
 777
 778  err_detach:
 779         acpi_detach_data(device->handle, acpi_bus_data_handler);
 780         return result;
 781 }
 782
 783 static void acpi_device_unregister(struct acpi_device *device)
 784 {
 785         mutex_lock(&acpi_device_lock);
 786         if (device->parent)
 787                 list_del(&device->node);
 788
 789         list_del(&device->wakeup_list);
 790         mutex_unlock(&acpi_device_lock);
 791
 792         acpi_detach_data(device->handle, acpi_bus_data_handler);
 793
 794         acpi_power_add_remove_device(device, false);
 795         acpi_device_remove_files(device);
 796         if (device->remove)
 797                 device->remove(device);
 798
 799         device_del(&device->dev);
 800         /*
 801          * Transition the device to D3cold to drop the reference counts of all
 802          * power resources the device depends on and turn off the ones that have
 803          * no more references.
 804          */
 805         acpi_device_set_power(device, ACPI_STATE_D3_COLD);
 806         device->handle = NULL;
 807         put_device(&device->dev);
 808 }
 809
 810 /* --------------------------------------------------------------------------
 811                                  Driver Management
 812    -------------------------------------------------------------------------- */
 813 /**
 814  * acpi_bus_driver_init - add a device to a driver
 815  * @device: the device to add and initialize
 816  * @driver: driver for the device
 817  *
 818  * Used to initialize a device via its device driver.  Called whenever a
 819  * driver is bound to a device.  Invokes the driver's add() ops.
 820  */
 821 static int
 822 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 823 {
 824         int result = 0;
 825
 826         if (!device || !driver)
 827                 return -EINVAL;
 828
 829         if (!driver->ops.add)
 830                 return -ENOSYS;
 831
 832         result = driver->ops.add(device);
 833         if (result) {
 834                 device->driver = NULL;
 835                 device->driver_data = NULL;
 836                 return result;
 837         }
 838
 839         device->driver = driver;
 840
 841         /*
 842          * TBD - Configuration Management: Assign resources to device based
 843          * upon possible configuration and currently allocated resources.
 844          */
 845
 846         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 847                           "Driver successfully bound to device\n"));
 848         return 0;
 849 }
 850
 851 /**
 852  * acpi_bus_register_driver - register a driver with the ACPI bus
 853  * @driver: driver being registered
 854  *
 855  * Registers a driver with the ACPI bus.  Searches the namespace for all
 856  * devices that match the driver's criteria and binds.  Returns zero for
 857  * success or a negative error status for failure.
 858  */
 859 int acpi_bus_register_driver(struct acpi_driver *driver)
 860 {
 861         int ret;
 862
 863         if (acpi_disabled)
 864                 return -ENODEV;
 865         driver->drv.name = driver->name;
 866         driver->drv.bus = &acpi_bus_type;
 867         driver->drv.owner = driver->owner;
 868
 869         ret = driver_register(&driver->drv);
 870         return ret;
 871 }
 872
 873 EXPORT_SYMBOL(acpi_bus_register_driver);
 874
 875 /**
 876  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 877  * @driver: driver to unregister
 878  *
 879  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 880  * devices that match the driver's criteria and unbinds.
 881  */
 882 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 883 {
 884         driver_unregister(&driver->drv);
 885 }
 886
 887 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 888
 889 /* --------------------------------------------------------------------------
 890                                  Device Enumeration
 891    -------------------------------------------------------------------------- */
 892 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 893 {
 894         struct acpi_device *device = NULL;
 895         acpi_status status;
 896
 897         /*
 898          * Fixed hardware devices do not appear in the namespace and do not
 899          * have handles, but we fabricate acpi_devices for them, so we have
 900          * to deal with them specially.
 901          */
 902         if (!handle)
 903                 return acpi_root;
 904
 905         do {
 906                 status = acpi_get_parent(handle, &handle);
 907                 if (ACPI_FAILURE(status))
 908                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 909         } while (acpi_bus_get_device(handle, &device));
 910         return device;
 911 }
 912
 913 acpi_status
 914 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 915 {
 916         acpi_status status;
 917         acpi_handle tmp;
 918         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 919         union acpi_object *obj;
 920
 921         status = acpi_get_handle(handle, "_EJD", &tmp);
 922         if (ACPI_FAILURE(status))
 923                 return status;
 924
 925         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 926         if (ACPI_SUCCESS(status)) {
 927                 obj = buffer.pointer;
 928                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 929                                          ejd);
 930                 kfree(buffer.pointer);
 931         }
 932         return status;
 933 }
 934 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 935
 936 void acpi_bus_data_handler(acpi_handle handle, void *context)
 937 {
 938
 939         /* TBD */
 940
 941         return;
 942 }
 943
 944 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 945                                         struct acpi_device_wakeup *wakeup)
 946 {
 947         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 948         union acpi_object *package = NULL;
 949         union acpi_object *element = NULL;
 950         acpi_status status;
 951         int err = -ENODATA;
 952
 953         if (!wakeup)
 954                 return -EINVAL;
 955
 956         INIT_LIST_HEAD(&wakeup->resources);
 957
 958         /* _PRW */
 959         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 960         if (ACPI_FAILURE(status)) {
 961                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 962                 return err;
 963         }
 964
 965         package = (union acpi_object *)buffer.pointer;
 966
 967         if (!package || package->package.count < 2)
 968                 goto out;
 969
 970         element = &(package->package.elements[0]);
 971         if (!element)
 972                 goto out;
 973
 974         if (element->type == ACPI_TYPE_PACKAGE) {
 975                 if ((element->package.count < 2) ||
 976                     (element->package.elements[0].type !=
 977                      ACPI_TYPE_LOCAL_REFERENCE)
 978                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 979                         goto out;
 980
 981                 wakeup->gpe_device =
 982                     element->package.elements[0].reference.handle;
 983                 wakeup->gpe_number =
 984                     (u32) element->package.elements[1].integer.value;
 985         } else if (element->type == ACPI_TYPE_INTEGER) {
 986                 wakeup->gpe_device = NULL;
 987                 wakeup->gpe_number = element->integer.value;
 988         } else {
 989                 goto out;
 990         }
 991
 992         element = &(package->package.elements[1]);
 993         if (element->type != ACPI_TYPE_INTEGER)
 994                 goto out;
 995
 996         wakeup->sleep_state = element->integer.value;
 997
 998         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 999         if (err)
1000                 goto out;
1001
1002         if (!list_empty(&wakeup->resources)) {
1003                 int sleep_state;
1004
1005                 sleep_state = acpi_power_min_system_level(&wakeup->resources);
1006                 if (sleep_state < wakeup->sleep_state) {
1007                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
1008                                          "(S%d) by S%d from power resources\n",
1009                                          (int)wakeup->sleep_state, sleep_state);
1010                         wakeup->sleep_state = sleep_state;
1011                 }
1012         }
1013         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1014
1015  out:
1016         kfree(buffer.pointer);
1017         return err;
1018 }
1019
1020 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1021 {
1022         struct acpi_device_id button_device_ids[] = {
1023                 {"PNP0C0C", 0},
1024                 {"PNP0C0D", 0},
1025                 {"PNP0C0E", 0},
1026                 {"", 0},
1027         };
1028         acpi_status status;
1029         acpi_event_status event_status;
1030
1031         device->wakeup.flags.notifier_present = 0;
1032
1033         /* Power button, Lid switch always enable wakeup */
1034         if (!acpi_match_device_ids(device, button_device_ids)) {
1035                 device->wakeup.flags.run_wake = 1;
1036                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1037                         /* Do not use Lid/sleep button for S5 wakeup */
1038                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
1039                                 device->wakeup.sleep_state = ACPI_STATE_S4;
1040                 }
1041                 device_set_wakeup_capable(&device->dev, true);
1042                 return;
1043         }
1044
1045         status = acpi_get_gpe_status(device->wakeup.gpe_device,
1046                                         device->wakeup.gpe_number,
1047                                                 &event_status);
1048         if (status == AE_OK)
1049                 device->wakeup.flags.run_wake =
1050                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1051 }
1052
1053 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1054 {
1055         acpi_handle temp;
1056         acpi_status status = 0;
1057         int err;
1058
1059         /* Presence of _PRW indicates wake capable */
1060         status = acpi_get_handle(device->handle, "_PRW", &temp);
1061         if (ACPI_FAILURE(status))
1062                 return;
1063
1064         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1065                                                            &device->wakeup);
1066         if (err) {
1067                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1068                 return;
1069         }
1070
1071         device->wakeup.flags.valid = 1;
1072         device->wakeup.prepare_count = 0;
1073         acpi_bus_set_run_wake_flags(device);
1074         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1075          * system for the ACPI device with the _PRW object.
1076          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1077          * So it is necessary to call _DSW object first. Only when it is not
1078          * present will the _PSW object used.
1079          */
1080         err = acpi_device_sleep_wake(device, 0, 0, 0);
1081         if (err)
1082                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1083                                 "error in _DSW or _PSW evaluation\n"));
1084 }
1085
1086 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1087 {
1088         struct acpi_device_power_state *ps = &device->power.states[state];
1089         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1090         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1091         acpi_handle handle;
1092         acpi_status status;
1093
1094         INIT_LIST_HEAD(&ps->resources);
1095
1096         /* Evaluate "_PRx" to get referenced power resources */
1097         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1098         if (ACPI_SUCCESS(status)) {
1099                 union acpi_object *package = buffer.pointer;
1100
1101                 if (buffer.length && package
1102                     && package->type == ACPI_TYPE_PACKAGE
1103                     && package->package.count) {
1104                         int err = acpi_extract_power_resources(package, 0,
1105                                                                &ps->resources);
1106                         if (!err)
1107                                 device->power.flags.power_resources = 1;
1108                 }
1109                 ACPI_FREE(buffer.pointer);
1110         }
1111
1112         /* Evaluate "_PSx" to see if we can do explicit sets */
1113         pathname[2] = 'S';
1114         status = acpi_get_handle(device->handle, pathname, &handle);
1115         if (ACPI_SUCCESS(status))
1116                 ps->flags.explicit_set = 1;
1117
1118         /*
1119          * State is valid if there are means to put the device into it.
1120          * D3hot is only valid if _PR3 present.
1121          */
1122         if (!list_empty(&ps->resources)
1123             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1124                 ps->flags.valid = 1;
1125                 ps->flags.os_accessible = 1;
1126         }
1127
1128         ps->power = -1;         /* Unknown - driver assigned */
1129         ps->latency = -1;       /* Unknown - driver assigned */
1130 }
1131
1132 static void acpi_bus_get_power_flags(struct acpi_device *device)
1133 {
1134         acpi_status status;
1135         acpi_handle handle;
1136         u32 i;
1137
1138         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1139         status = acpi_get_handle(device->handle, "_PS0", &handle);
1140         if (ACPI_FAILURE(status)) {
1141                 status = acpi_get_handle(device->handle, "_PR0", &handle);
1142                 if (ACPI_FAILURE(status))
1143                         return;
1144         }
1145
1146         device->flags.power_manageable = 1;
1147
1148         /*
1149          * Power Management Flags
1150          */
1151         status = acpi_get_handle(device->handle, "_PSC", &handle);
1152         if (ACPI_SUCCESS(status))
1153                 device->power.flags.explicit_get = 1;
1154         status = acpi_get_handle(device->handle, "_IRC", &handle);
1155         if (ACPI_SUCCESS(status))
1156                 device->power.flags.inrush_current = 1;
1157
1158         /*
1159          * Enumerate supported power management states
1160          */
1161         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1162                 acpi_bus_init_power_state(device, i);
1163
1164         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1165
1166         /* Set defaults for D0 and D3 states (always valid) */
1167         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1168         device->power.states[ACPI_STATE_D0].power = 100;
1169         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1170         device->power.states[ACPI_STATE_D3].power = 0;
1171
1172         /* Set D3cold's explicit_set flag if _PS3 exists. */
1173         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1174                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1175
1176         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1177         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1178                         device->power.flags.power_resources)
1179                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1180
1181         if (acpi_bus_init_power(device)) {
1182                 acpi_free_power_resources_lists(device);
1183                 device->flags.power_manageable = 0;
1184         }
1185 }
1186
1187 static void acpi_bus_get_flags(struct acpi_device *device)
1188 {
1189         acpi_status status = AE_OK;
1190         acpi_handle temp = NULL;
1191
1192         /* Presence of _STA indicates 'dynamic_status' */
1193         status = acpi_get_handle(device->handle, "_STA", &temp);
1194         if (ACPI_SUCCESS(status))
1195                 device->flags.dynamic_status = 1;
1196
1197         /* Presence of _RMV indicates 'removable' */
1198         status = acpi_get_handle(device->handle, "_RMV", &temp);
1199         if (ACPI_SUCCESS(status))
1200                 device->flags.removable = 1;
1201
1202         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1203         status = acpi_get_handle(device->handle, "_EJD", &temp);
1204         if (ACPI_SUCCESS(status))
1205                 device->flags.ejectable = 1;
1206         else {
1207                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1208                 if (ACPI_SUCCESS(status))
1209                         device->flags.ejectable = 1;
1210         }
1211 }
1212
1213 static void acpi_device_get_busid(struct acpi_device *device)
1214 {
1215         char bus_id[5] = { '?', 0 };
1216         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1217         int i = 0;
1218
1219         /*
1220          * Bus ID
1221          * ------
1222          * The device's Bus ID is simply the object name.
1223          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1224          */
1225         if (ACPI_IS_ROOT_DEVICE(device)) {
1226                 strcpy(device->pnp.bus_id, "ACPI");
1227                 return;
1228         }
1229
1230         switch (device->device_type) {
1231         case ACPI_BUS_TYPE_POWER_BUTTON:
1232                 strcpy(device->pnp.bus_id, "PWRF");
1233                 break;
1234         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1235                 strcpy(device->pnp.bus_id, "SLPF");
1236                 break;
1237         default:
1238                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1239                 /* Clean up trailing underscores (if any) */
1240                 for (i = 3; i > 1; i--) {
1241                         if (bus_id[i] == '_')
1242                                 bus_id[i] = '\0';
1243                         else
1244                                 break;
1245                 }
1246                 strcpy(device->pnp.bus_id, bus_id);
1247                 break;
1248         }
1249 }
1250
1251 /*
1252  * acpi_bay_match - see if a device is an ejectable driver bay
1253  *
1254  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1255  * then we can safely call it an ejectable drive bay
1256  */
1257 static int acpi_bay_match(struct acpi_device *device){
1258         acpi_status status;
1259         acpi_handle handle;
1260         acpi_handle tmp;
1261         acpi_handle phandle;
1262
1263         handle = device->handle;
1264
1265         status = acpi_get_handle(handle, "_EJ0", &tmp);
1266         if (ACPI_FAILURE(status))
1267                 return -ENODEV;
1268
1269         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1270                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1271                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1272                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1273                 return 0;
1274
1275         if (acpi_get_parent(handle, &phandle))
1276                 return -ENODEV;
1277
1278         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1279                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1280                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1281                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1282                 return 0;
1283
1284         return -ENODEV;
1285 }
1286
1287 /*
1288  * acpi_dock_match - see if a device has a _DCK method
1289  */
1290 static int acpi_dock_match(struct acpi_device *device)
1291 {
1292         acpi_handle tmp;
1293         return acpi_get_handle(device->handle, "_DCK", &tmp);
1294 }
1295
1296 const char *acpi_device_hid(struct acpi_device *device)
1297 {
1298         struct acpi_hardware_id *hid;
1299
1300         if (list_empty(&device->pnp.ids))
1301                 return dummy_hid;
1302
1303         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1304         return hid->id;
1305 }
1306 EXPORT_SYMBOL(acpi_device_hid);
1307
1308 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1309 {
1310         struct acpi_hardware_id *id;
1311
1312         id = kmalloc(sizeof(*id), GFP_KERNEL);
1313         if (!id)
1314                 return;
1315
1316         id->id = kstrdup(dev_id, GFP_KERNEL);
1317         if (!id->id) {
1318                 kfree(id);
1319                 return;
1320         }
1321
1322         list_add_tail(&id->list, &device->pnp.ids);
1323 }
1324
1325 /*
1326  * Old IBM workstations have a DSDT bug wherein the SMBus object
1327  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1328  * prefix.  Work around this.
1329  */
1330 static int acpi_ibm_smbus_match(struct acpi_device *device)
1331 {
1332         acpi_handle h_dummy;
1333         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1334         int result;
1335
1336         if (!dmi_name_in_vendors("IBM"))
1337                 return -ENODEV;
1338
1339         /* Look for SMBS object */
1340         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1341         if (result)
1342                 return result;
1343
1344         if (strcmp("SMBS", path.pointer)) {
1345                 result = -ENODEV;
1346                 goto out;
1347         }
1348
1349         /* Does it have the necessary (but misnamed) methods? */
1350         result = -ENODEV;
1351         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1352             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1353             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1354                 result = 0;
1355 out:
1356         kfree(path.pointer);
1357         return result;
1358 }
1359
1360 static void acpi_device_set_id(struct acpi_device *device)
1361 {
1362         acpi_status status;
1363         struct acpi_device_info *info;
1364         struct acpi_pnp_device_id_list *cid_list;
1365         int i;
1366
1367         switch (device->device_type) {
1368         case ACPI_BUS_TYPE_DEVICE:
1369                 if (ACPI_IS_ROOT_DEVICE(device)) {
1370                         acpi_add_id(device, ACPI_SYSTEM_HID);
1371                         break;
1372                 }
1373
1374                 status = acpi_get_object_info(device->handle, &info);
1375                 if (ACPI_FAILURE(status)) {
1376                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1377                         return;
1378                 }
1379
1380                 if (info->valid & ACPI_VALID_HID)
1381                         acpi_add_id(device, info->hardware_id.string);
1382                 if (info->valid & ACPI_VALID_CID) {
1383                         cid_list = &info->compatible_id_list;
1384                         for (i = 0; i < cid_list->count; i++)
1385                                 acpi_add_id(device, cid_list->ids[i].string);
1386                 }
1387                 if (info->valid & ACPI_VALID_ADR) {
1388                         device->pnp.bus_address = info->address;
1389                         device->flags.bus_address = 1;
1390                 }
1391                 if (info->valid & ACPI_VALID_UID)
1392                         device->pnp.unique_id = kstrdup(info->unique_id.string,
1393                                                         GFP_KERNEL);
1394
1395                 kfree(info);
1396
1397                 /*
1398                  * Some devices don't reliably have _HIDs & _CIDs, so add
1399                  * synthetic HIDs to make sure drivers can find them.
1400                  */
1401                 if (acpi_is_video_device(device))
1402                         acpi_add_id(device, ACPI_VIDEO_HID);
1403                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1404                         acpi_add_id(device, ACPI_BAY_HID);
1405                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1406                         acpi_add_id(device, ACPI_DOCK_HID);
1407                 else if (!acpi_ibm_smbus_match(device))
1408                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1409                 else if (list_empty(&device->pnp.ids) &&
1410                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1411                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1412                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1413                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1414                 }
1415
1416                 break;
1417         case ACPI_BUS_TYPE_POWER:
1418                 acpi_add_id(device, ACPI_POWER_HID);
1419                 break;
1420         case ACPI_BUS_TYPE_PROCESSOR:
1421                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1422                 break;
1423         case ACPI_BUS_TYPE_THERMAL:
1424                 acpi_add_id(device, ACPI_THERMAL_HID);
1425                 break;
1426         case ACPI_BUS_TYPE_POWER_BUTTON:
1427                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1428                 break;
1429         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1430                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1431                 break;
1432         }
1433 }
1434
1435 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1436                              int type, unsigned long long sta)
1437 {
1438         INIT_LIST_HEAD(&device->pnp.ids);
1439         device->device_type = type;
1440         device->handle = handle;
1441         device->parent = acpi_bus_get_parent(handle);
1442         STRUCT_TO_INT(device->status) = sta;
1443         acpi_device_get_busid(device);
1444         acpi_device_set_id(device);
1445         acpi_bus_get_flags(device);
1446         device->flags.match_driver = false;
1447         device_initialize(&device->dev);
1448         dev_set_uevent_suppress(&device->dev, true);
1449 }
1450
1451 void acpi_device_add_finalize(struct acpi_device *device)
1452 {
1453         device->flags.match_driver = true;
1454         dev_set_uevent_suppress(&device->dev, false);
1455         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1456 }
1457
1458 static int acpi_add_single_object(struct acpi_device **child,
1459                                   acpi_handle handle, int type,
1460                                   unsigned long long sta)
1461 {
1462         int result;
1463         struct acpi_device *device;
1464         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1465
1466         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1467         if (!device) {
1468                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1469                 return -ENOMEM;
1470         }
1471
1472         acpi_init_device_object(device, handle, type, sta);
1473         acpi_bus_get_power_flags(device);
1474         acpi_bus_get_wakeup_device_flags(device);
1475
1476         result = acpi_device_add(device, acpi_device_release);
1477         if (result) {
1478                 acpi_device_release(&device->dev);
1479                 return result;
1480         }
1481
1482         acpi_power_add_remove_device(device, true);
1483         acpi_device_add_finalize(device);
1484         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1485         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1486                 dev_name(&device->dev), (char *) buffer.pointer,
1487                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1488         kfree(buffer.pointer);
1489         *child = device;
1490         return 0;
1491 }
1492
1493 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1494                                     unsigned long long *sta)
1495 {
1496         acpi_status status;
1497         acpi_object_type acpi_type;
1498
1499         status = acpi_get_type(handle, &acpi_type);
1500         if (ACPI_FAILURE(status))
1501                 return -ENODEV;
1502
1503         switch (acpi_type) {
1504         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1505         case ACPI_TYPE_DEVICE:
1506                 *type = ACPI_BUS_TYPE_DEVICE;
1507                 status = acpi_bus_get_status_handle(handle, sta);
1508                 if (ACPI_FAILURE(status))
1509                         return -ENODEV;
1510                 break;
1511         case ACPI_TYPE_PROCESSOR:
1512                 *type = ACPI_BUS_TYPE_PROCESSOR;
1513                 status = acpi_bus_get_status_handle(handle, sta);
1514                 if (ACPI_FAILURE(status))
1515                         return -ENODEV;
1516                 break;
1517         case ACPI_TYPE_THERMAL:
1518                 *type = ACPI_BUS_TYPE_THERMAL;
1519                 *sta = ACPI_STA_DEFAULT;
1520                 break;
1521         case ACPI_TYPE_POWER:
1522                 *type = ACPI_BUS_TYPE_POWER;
1523                 *sta = ACPI_STA_DEFAULT;
1524                 break;
1525         default:
1526                 return -ENODEV;
1527         }
1528
1529         return 0;
1530 }
1531
1532 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1533                                       void *not_used, void **return_value)
1534 {
1535         struct acpi_device *device = NULL;
1536         int type;
1537         unsigned long long sta;
1538         acpi_status status;
1539         int result;
1540
1541         acpi_bus_get_device(handle, &device);
1542         if (device)
1543                 goto out;
1544
1545         result = acpi_bus_type_and_status(handle, &type, &sta);
1546         if (result)
1547                 return AE_OK;
1548
1549         if (type == ACPI_BUS_TYPE_POWER) {
1550                 acpi_add_power_resource(handle);
1551                 return AE_OK;
1552         }
1553
1554         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1555             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1556                 struct acpi_device_wakeup wakeup;
1557                 acpi_handle temp;
1558
1559                 status = acpi_get_handle(handle, "_PRW", &temp);
1560                 if (ACPI_SUCCESS(status)) {
1561                         acpi_bus_extract_wakeup_device_power_package(handle,
1562                                                                      &wakeup);
1563                         acpi_power_resources_list_free(&wakeup.resources);
1564                 }
1565                 return AE_CTRL_DEPTH;
1566         }
1567
1568         acpi_add_single_object(&device, handle, type, sta);
1569         if (!device)
1570                 return AE_CTRL_DEPTH;
1571
1572  out:
1573         if (!*return_value)
1574                 *return_value = device;
1575
1576         return AE_OK;
1577 }
1578
1579 static int acpi_scan_do_attach_handler(struct acpi_device *device, char *id)
1580 {
1581         struct acpi_scan_handler *handler;
1582
1583         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) {
1584                 const struct acpi_device_id *devid;
1585
1586                 for (devid = handler->ids; devid->id[0]; devid++) {
1587                         int ret;
1588
1589                         if (strcmp((char *)devid->id, id))
1590                                 continue;
1591
1592                         ret = handler->attach(device, devid);
1593                         if (ret > 0) {
1594                                 device->handler = handler;
1595                                 return ret;
1596                         } else if (ret < 0) {
1597                                 return ret;
1598                         }
1599                 }
1600         }
1601         return 0;
1602 }
1603
1604 static int acpi_scan_attach_handler(struct acpi_device *device)
1605 {
1606         struct acpi_hardware_id *hwid;
1607         int ret = 0;
1608
1609         list_for_each_entry(hwid, &device->pnp.ids, list) {
1610                 ret = acpi_scan_do_attach_handler(device, hwid->id);
1611                 if (ret)
1612                         break;
1613
1614         }
1615         return ret;
1616 }
1617
1618 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1619                                           void *not_used, void **ret_not_used)
1620 {
1621         struct acpi_device *device;
1622         unsigned long long sta_not_used;
1623         int ret;
1624
1625         /*
1626          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1627          * namespace walks prematurely.
1628          */
1629         if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1630                 return AE_OK;
1631
1632         if (acpi_bus_get_device(handle, &device))
1633                 return AE_CTRL_DEPTH;
1634
1635         ret = acpi_scan_attach_handler(device);
1636         if (ret)
1637                 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1638
1639         ret = device_attach(&device->dev);
1640         return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1641 }
1642
1643 /**
1644  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1645  * @handle: Root of the namespace scope to scan.
1646  *
1647  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1648  * found devices.
1649  *
1650  * If no devices were found, -ENODEV is returned, but it does not mean that
1651  * there has been a real error.  There just have been no suitable ACPI objects
1652  * in the table trunk from which the kernel could create a device and add an
1653  * appropriate driver.
1654  *
1655  * Must be called under acpi_scan_lock.
1656  */
1657 int acpi_bus_scan(acpi_handle handle)
1658 {
1659         void *device = NULL;
1660         int error = 0;
1661
1662         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1663                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1664                                     acpi_bus_check_add, NULL, NULL, &device);
1665
1666         if (!device)
1667                 error = -ENODEV;
1668         else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1669                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1670                                     acpi_bus_device_attach, NULL, NULL, NULL);
1671
1672         return error;
1673 }
1674 EXPORT_SYMBOL(acpi_bus_scan);
1675
1676 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1677                                           void *not_used, void **ret_not_used)
1678 {
1679         struct acpi_device *device = NULL;
1680
1681         if (!acpi_bus_get_device(handle, &device)) {
1682                 struct acpi_scan_handler *dev_handler = device->handler;
1683
1684                 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1685                 if (dev_handler) {
1686                         if (dev_handler->detach)
1687                                 dev_handler->detach(device);
1688
1689                         device->handler = NULL;
1690                 } else {
1691                         device_release_driver(&device->dev);
1692                 }
1693         }
1694         return AE_OK;
1695 }
1696
1697 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1698                                    void *not_used, void **ret_not_used)
1699 {
1700         struct acpi_device *device = NULL;
1701
1702         if (!acpi_bus_get_device(handle, &device))
1703                 acpi_device_unregister(device);
1704
1705         return AE_OK;
1706 }
1707
1708 /**
1709  * acpi_bus_trim - Remove ACPI device node and all of its descendants
1710  * @start: Root of the ACPI device nodes subtree to remove.
1711  *
1712  * Must be called under acpi_scan_lock.
1713  */
1714 void acpi_bus_trim(struct acpi_device *start)
1715 {
1716         /*
1717          * Execute acpi_bus_device_detach() as a post-order callback to detach
1718          * all ACPI drivers from the device nodes being removed.
1719          */
1720         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1721                             acpi_bus_device_detach, NULL, NULL);
1722         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1723         /*
1724          * Execute acpi_bus_remove() as a post-order callback to remove device
1725          * nodes in the given namespace scope.
1726          */
1727         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1728                             acpi_bus_remove, NULL, NULL);
1729         acpi_bus_remove(start->handle, 0, NULL, NULL);
1730 }
1731 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1732
1733 static int acpi_bus_scan_fixed(void)
1734 {
1735         int result = 0;
1736
1737         /*
1738          * Enumerate all fixed-feature devices.
1739          */
1740         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1741                 struct acpi_device *device = NULL;
1742
1743                 result = acpi_add_single_object(&device, NULL,
1744                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1745                                                 ACPI_STA_DEFAULT);
1746                 if (result)
1747                         return result;
1748
1749                 result = device_attach(&device->dev);
1750                 if (result < 0)
1751                         return result;
1752
1753                 device_init_wakeup(&device->dev, true);
1754         }
1755
1756         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1757                 struct acpi_device *device = NULL;
1758
1759                 result = acpi_add_single_object(&device, NULL,
1760                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1761                                                 ACPI_STA_DEFAULT);
1762                 if (result)
1763                         return result;
1764
1765                 result = device_attach(&device->dev);
1766         }
1767
1768         return result < 0 ? result : 0;
1769 }
1770
1771 int __init acpi_scan_init(void)
1772 {
1773         int result;
1774
1775         result = bus_register(&acpi_bus_type);
1776         if (result) {
1777                 /* We don't want to quit even if we failed to add suspend/resume */
1778                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1779         }
1780
1781         acpi_pci_root_init();
1782         acpi_pci_link_init();
1783         acpi_platform_init();
1784         acpi_csrt_init();
1785         acpi_container_init();
1786
1787         mutex_lock(&acpi_scan_lock);
1788         /*
1789          * Enumerate devices in the ACPI namespace.
1790          */
1791         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1792         if (result)
1793                 goto out;
1794
1795         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1796         if (result)
1797                 goto out;
1798
1799         result = acpi_bus_scan_fixed();
1800         if (result) {
1801                 acpi_device_unregister(acpi_root);
1802                 goto out;
1803         }
1804
1805         acpi_update_all_gpes();
1806
1807  out:
1808         mutex_unlock(&acpi_scan_lock);
1809         return result;
1810 }