linux/drivers/acpi/scan.c
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   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
  20ACPI_MODULE_NAME("scan");
  21#define STRUCT_TO_INT(s)        (*((int*)&s))
  22extern 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
  30static const char *dummy_hid = "device";
  31
  32static LIST_HEAD(acpi_device_list);
  33static LIST_HEAD(acpi_bus_id_list);
  34static DEFINE_MUTEX(acpi_scan_lock);
  35static LIST_HEAD(acpi_scan_handlers_list);
  36DEFINE_MUTEX(acpi_device_lock);
  37LIST_HEAD(acpi_wakeup_device_list);
  38
  39struct acpi_device_bus_id{
  40        char bus_id[15];
  41        unsigned int instance_no;
  42        struct list_head node;
  43};
  44
  45void acpi_scan_lock_acquire(void)
  46{
  47        mutex_lock(&acpi_scan_lock);
  48}
  49EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  50
  51void acpi_scan_lock_release(void)
  52{
  53        mutex_unlock(&acpi_scan_lock);
  54}
  55EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  56
  57int 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
  66int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
  67                                       const char *hotplug_profile_name)
  68{
  69        int error;
  70
  71        error = acpi_scan_add_handler(handler);
  72        if (error)
  73                return error;
  74
  75        acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
  76        return 0;
  77}
  78
  79/*
  80 * Creates hid/cid(s) string needed for modalias and uevent
  81 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  82 * char *modalias: "acpi:IBM0001:ACPI0001"
  83*/
  84static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  85                           int size)
  86{
  87        int len;
  88        int count;
  89        struct acpi_hardware_id *id;
  90
  91        if (list_empty(&acpi_dev->pnp.ids))
  92                return 0;
  93
  94        len = snprintf(modalias, size, "acpi:");
  95        size -= len;
  96
  97        list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
  98                count = snprintf(&modalias[len], size, "%s:", id->id);
  99                if (count < 0 || count >= size)
 100                        return -EINVAL;
 101                len += count;
 102                size -= count;
 103        }
 104
 105        modalias[len] = '\0';
 106        return len;
 107}
 108
 109static ssize_t
 110acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
 111        struct acpi_device *acpi_dev = to_acpi_device(dev);
 112        int len;
 113
 114        /* Device has no HID and no CID or string is >1024 */
 115        len = create_modalias(acpi_dev, buf, 1024);
 116        if (len <= 0)
 117                return 0;
 118        buf[len++] = '\n';
 119        return len;
 120}
 121static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 122
 123static int acpi_scan_hot_remove(struct acpi_device *device)
 124{
 125        acpi_handle handle = device->handle;
 126        acpi_handle not_used;
 127        struct acpi_object_list arg_list;
 128        union acpi_object arg;
 129        acpi_status status;
 130        unsigned long long sta;
 131
 132        /* If there is no handle, the device node has been unregistered. */
 133        if (!handle) {
 134                dev_dbg(&device->dev, "ACPI handle missing\n");
 135                put_device(&device->dev);
 136                return -EINVAL;
 137        }
 138
 139        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 140                "Hot-removing device %s...\n", dev_name(&device->dev)));
 141
 142        acpi_bus_trim(device);
 143        /* Device node has been unregistered. */
 144        put_device(&device->dev);
 145        device = NULL;
 146
 147        if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &not_used))) {
 148                arg_list.count = 1;
 149                arg_list.pointer = &arg;
 150                arg.type = ACPI_TYPE_INTEGER;
 151                arg.integer.value = 0;
 152                acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 153        }
 154
 155        arg_list.count = 1;
 156        arg_list.pointer = &arg;
 157        arg.type = ACPI_TYPE_INTEGER;
 158        arg.integer.value = 1;
 159
 160        /*
 161         * TBD: _EJD support.
 162         */
 163        status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 164        if (ACPI_FAILURE(status)) {
 165                if (status == AE_NOT_FOUND) {
 166                        return -ENODEV;
 167                } else {
 168                        acpi_handle_warn(handle, "Eject failed (0x%x)\n",
 169                                                                status);
 170                        return -EIO;
 171                }
 172        }
 173
 174        /*
 175         * Verify if eject was indeed successful.  If not, log an error
 176         * message.  No need to call _OST since _EJ0 call was made OK.
 177         */
 178        status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 179        if (ACPI_FAILURE(status)) {
 180                acpi_handle_warn(handle,
 181                        "Status check after eject failed (0x%x)\n", status);
 182        } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 183                acpi_handle_warn(handle,
 184                        "Eject incomplete - status 0x%llx\n", sta);
 185        }
 186
 187        return 0;
 188}
 189
 190static void acpi_bus_device_eject(void *context)
 191{
 192        acpi_handle handle = context;
 193        struct acpi_device *device = NULL;
 194        struct acpi_scan_handler *handler;
 195        u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 196
 197        mutex_lock(&acpi_scan_lock);
 198
 199        acpi_bus_get_device(handle, &device);
 200        if (!device)
 201                goto err_out;
 202
 203        handler = device->handler;
 204        if (!handler || !handler->hotplug.enabled) {
 205                ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 206                goto err_out;
 207        }
 208        acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
 209                                  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 210        if (handler->hotplug.mode == AHM_CONTAINER) {
 211                device->flags.eject_pending = true;
 212                kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 213        } else {
 214                int error;
 215
 216                get_device(&device->dev);
 217                error = acpi_scan_hot_remove(device);
 218                if (error)
 219                        goto err_out;
 220        }
 221
 222 out:
 223        mutex_unlock(&acpi_scan_lock);
 224        return;
 225
 226 err_out:
 227        acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
 228                                  NULL);
 229        goto out;
 230}
 231
 232static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
 233{
 234        struct acpi_device *device = NULL;
 235        u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 236        int error;
 237
 238        mutex_lock(&acpi_scan_lock);
 239
 240        acpi_bus_get_device(handle, &device);
 241        if (device) {
 242                dev_warn(&device->dev, "Attempt to re-insert\n");
 243                goto out;
 244        }
 245        acpi_evaluate_hotplug_ost(handle, ost_source,
 246                                  ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
 247        error = acpi_bus_scan(handle);
 248        if (error) {
 249                acpi_handle_warn(handle, "Namespace scan failure\n");
 250                goto out;
 251        }
 252        error = acpi_bus_get_device(handle, &device);
 253        if (error) {
 254                acpi_handle_warn(handle, "Missing device node object\n");
 255                goto out;
 256        }
 257        ost_code = ACPI_OST_SC_SUCCESS;
 258        if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
 259                kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 260
 261 out:
 262        acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
 263        mutex_unlock(&acpi_scan_lock);
 264}
 265
 266static void acpi_scan_bus_check(void *context)
 267{
 268        acpi_scan_bus_device_check((acpi_handle)context,
 269                                   ACPI_NOTIFY_BUS_CHECK);
 270}
 271
 272static void acpi_scan_device_check(void *context)
 273{
 274        acpi_scan_bus_device_check((acpi_handle)context,
 275                                   ACPI_NOTIFY_DEVICE_CHECK);
 276}
 277
 278static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
 279{
 280        u32 ost_status;
 281
 282        switch (type) {
 283        case ACPI_NOTIFY_BUS_CHECK:
 284                acpi_handle_debug(handle,
 285                        "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
 286                ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
 287                break;
 288        case ACPI_NOTIFY_DEVICE_CHECK:
 289                acpi_handle_debug(handle,
 290                        "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
 291                ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
 292                break;
 293        case ACPI_NOTIFY_EJECT_REQUEST:
 294                acpi_handle_debug(handle,
 295                        "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
 296                ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 297                break;
 298        default:
 299                /* non-hotplug event; possibly handled by other handler */
 300                return;
 301        }
 302
 303        acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
 304}
 305
 306static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
 307{
 308        acpi_osd_exec_callback callback;
 309        struct acpi_scan_handler *handler = data;
 310        acpi_status status;
 311
 312        if (!handler->hotplug.enabled)
 313                return acpi_hotplug_unsupported(handle, type);
 314
 315        switch (type) {
 316        case ACPI_NOTIFY_BUS_CHECK:
 317                acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 318                callback = acpi_scan_bus_check;
 319                break;
 320        case ACPI_NOTIFY_DEVICE_CHECK:
 321                acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 322                callback = acpi_scan_device_check;
 323                break;
 324        case ACPI_NOTIFY_EJECT_REQUEST:
 325                acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 326                callback = acpi_bus_device_eject;
 327                break;
 328        default:
 329                /* non-hotplug event; possibly handled by other handler */
 330                return;
 331        }
 332        status = acpi_os_hotplug_execute(callback, handle);
 333        if (ACPI_FAILURE(status))
 334                acpi_evaluate_hotplug_ost(handle, type,
 335                                          ACPI_OST_SC_NON_SPECIFIC_FAILURE,
 336                                          NULL);
 337}
 338
 339/**
 340 * acpi_bus_hot_remove_device: hot-remove a device and its children
 341 * @context: struct acpi_eject_event pointer (freed in this func)
 342 *
 343 * Hot-remove a device and its children. This function frees up the
 344 * memory space passed by arg context, so that the caller may call
 345 * this function asynchronously through acpi_os_hotplug_execute().
 346 */
 347void acpi_bus_hot_remove_device(void *context)
 348{
 349        struct acpi_eject_event *ej_event = context;
 350        struct acpi_device *device = ej_event->device;
 351        acpi_handle handle = device->handle;
 352        int error;
 353
 354        mutex_lock(&acpi_scan_lock);
 355
 356        error = acpi_scan_hot_remove(device);
 357        if (error && handle)
 358                acpi_evaluate_hotplug_ost(handle, ej_event->event,
 359                                          ACPI_OST_SC_NON_SPECIFIC_FAILURE,
 360                                          NULL);
 361
 362        mutex_unlock(&acpi_scan_lock);
 363        kfree(context);
 364}
 365EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 366
 367static ssize_t real_power_state_show(struct device *dev,
 368                                     struct device_attribute *attr, char *buf)
 369{
 370        struct acpi_device *adev = to_acpi_device(dev);
 371        int state;
 372        int ret;
 373
 374        ret = acpi_device_get_power(adev, &state);
 375        if (ret)
 376                return ret;
 377
 378        return sprintf(buf, "%s\n", acpi_power_state_string(state));
 379}
 380
 381static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 382
 383static ssize_t power_state_show(struct device *dev,
 384                                struct device_attribute *attr, char *buf)
 385{
 386        struct acpi_device *adev = to_acpi_device(dev);
 387
 388        return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 389}
 390
 391static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 392
 393static ssize_t
 394acpi_eject_store(struct device *d, struct device_attribute *attr,
 395                const char *buf, size_t count)
 396{
 397        struct acpi_device *acpi_device = to_acpi_device(d);
 398        struct acpi_eject_event *ej_event;
 399        acpi_object_type not_used;
 400        acpi_status status;
 401        u32 ost_source;
 402        int ret;
 403
 404        if (!count || buf[0] != '1')
 405                return -EINVAL;
 406
 407        if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
 408            && !acpi_device->driver)
 409                return -ENODEV;
 410
 411        status = acpi_get_type(acpi_device->handle, &not_used);
 412        if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
 413                return -ENODEV;
 414
 415        mutex_lock(&acpi_scan_lock);
 416
 417        if (acpi_device->flags.eject_pending) {
 418                /* ACPI eject notification event. */
 419                ost_source = ACPI_NOTIFY_EJECT_REQUEST;
 420                acpi_device->flags.eject_pending = 0;
 421        } else {
 422                /* Eject initiated by user space. */
 423                ost_source = ACPI_OST_EC_OSPM_EJECT;
 424        }
 425        ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 426        if (!ej_event) {
 427                ret = -ENOMEM;
 428                goto err_out;
 429        }
 430        acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
 431                                  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 432        ej_event->device = acpi_device;
 433        ej_event->event = ost_source;
 434        get_device(&acpi_device->dev);
 435        status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
 436        if (ACPI_FAILURE(status)) {
 437                put_device(&acpi_device->dev);
 438                kfree(ej_event);
 439                ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
 440                goto err_out;
 441        }
 442        ret = count;
 443
 444 out:
 445        mutex_unlock(&acpi_scan_lock);
 446        return ret;
 447
 448 err_out:
 449        acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
 450                                  ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 451        goto out;
 452}
 453
 454static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 455
 456static ssize_t
 457acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 458        struct acpi_device *acpi_dev = to_acpi_device(dev);
 459
 460        return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 461}
 462static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 463
 464static ssize_t acpi_device_uid_show(struct device *dev,
 465                                    struct device_attribute *attr, char *buf)
 466{
 467        struct acpi_device *acpi_dev = to_acpi_device(dev);
 468
 469        return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 470}
 471static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 472
 473static ssize_t acpi_device_adr_show(struct device *dev,
 474                                    struct device_attribute *attr, char *buf)
 475{
 476        struct acpi_device *acpi_dev = to_acpi_device(dev);
 477
 478        return sprintf(buf, "0x%08x\n",
 479                       (unsigned int)(acpi_dev->pnp.bus_address));
 480}
 481static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 482
 483static ssize_t
 484acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 485        struct acpi_device *acpi_dev = to_acpi_device(dev);
 486        struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 487        int result;
 488
 489        result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 490        if (result)
 491                goto end;
 492
 493        result = sprintf(buf, "%s\n", (char*)path.pointer);
 494        kfree(path.pointer);
 495end:
 496        return result;
 497}
 498static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 499
 500/* sysfs file that shows description text from the ACPI _STR method */
 501static ssize_t description_show(struct device *dev,
 502                                struct device_attribute *attr,
 503                                char *buf) {
 504        struct acpi_device *acpi_dev = to_acpi_device(dev);
 505        int result;
 506
 507        if (acpi_dev->pnp.str_obj == NULL)
 508                return 0;
 509
 510        /*
 511         * The _STR object contains a Unicode identifier for a device.
 512         * We need to convert to utf-8 so it can be displayed.
 513         */
 514        result = utf16s_to_utf8s(
 515                (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 516                acpi_dev->pnp.str_obj->buffer.length,
 517                UTF16_LITTLE_ENDIAN, buf,
 518                PAGE_SIZE);
 519
 520        buf[result++] = '\n';
 521
 522        return result;
 523}
 524static DEVICE_ATTR(description, 0444, description_show, NULL);
 525
 526static ssize_t
 527acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 528                     char *buf) {
 529        struct acpi_device *acpi_dev = to_acpi_device(dev);
 530
 531        return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 532}
 533static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 534
 535static int acpi_device_setup_files(struct acpi_device *dev)
 536{
 537        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 538        acpi_status status;
 539        acpi_handle temp;
 540        unsigned long long sun;
 541        int result = 0;
 542
 543        /*
 544         * Devices gotten from FADT don't have a "path" attribute
 545         */
 546        if (dev->handle) {
 547                result = device_create_file(&dev->dev, &dev_attr_path);
 548                if (result)
 549                        goto end;
 550        }
 551
 552        if (!list_empty(&dev->pnp.ids)) {
 553                result = device_create_file(&dev->dev, &dev_attr_hid);
 554                if (result)
 555                        goto end;
 556
 557                result = device_create_file(&dev->dev, &dev_attr_modalias);
 558                if (result)
 559                        goto end;
 560        }
 561
 562        /*
 563         * If device has _STR, 'description' file is created
 564         */
 565        status = acpi_get_handle(dev->handle, "_STR", &temp);
 566        if (ACPI_SUCCESS(status)) {
 567                status = acpi_evaluate_object(dev->handle, "_STR",
 568                                        NULL, &buffer);
 569                if (ACPI_FAILURE(status))
 570                        buffer.pointer = NULL;
 571                dev->pnp.str_obj = buffer.pointer;
 572                result = device_create_file(&dev->dev, &dev_attr_description);
 573                if (result)
 574                        goto end;
 575        }
 576
 577        if (dev->pnp.type.bus_address)
 578                result = device_create_file(&dev->dev, &dev_attr_adr);
 579        if (dev->pnp.unique_id)
 580                result = device_create_file(&dev->dev, &dev_attr_uid);
 581
 582        status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 583        if (ACPI_SUCCESS(status)) {
 584                dev->pnp.sun = (unsigned long)sun;
 585                result = device_create_file(&dev->dev, &dev_attr_sun);
 586                if (result)
 587                        goto end;
 588        } else {
 589                dev->pnp.sun = (unsigned long)-1;
 590        }
 591
 592        /*
 593         * If device has _EJ0, 'eject' file is created that is used to trigger
 594         * hot-removal function from userland.
 595         */
 596        status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 597        if (ACPI_SUCCESS(status)) {
 598                result = device_create_file(&dev->dev, &dev_attr_eject);
 599                if (result)
 600                        return result;
 601        }
 602
 603        if (dev->flags.power_manageable) {
 604                result = device_create_file(&dev->dev, &dev_attr_power_state);
 605                if (result)
 606                        return result;
 607
 608                if (dev->power.flags.power_resources)
 609                        result = device_create_file(&dev->dev,
 610                                                    &dev_attr_real_power_state);
 611        }
 612
 613end:
 614        return result;
 615}
 616
 617static void acpi_device_remove_files(struct acpi_device *dev)
 618{
 619        acpi_status status;
 620        acpi_handle temp;
 621
 622        if (dev->flags.power_manageable) {
 623                device_remove_file(&dev->dev, &dev_attr_power_state);
 624                if (dev->power.flags.power_resources)
 625                        device_remove_file(&dev->dev,
 626                                           &dev_attr_real_power_state);
 627        }
 628
 629        /*
 630         * If device has _STR, remove 'description' file
 631         */
 632        status = acpi_get_handle(dev->handle, "_STR", &temp);
 633        if (ACPI_SUCCESS(status)) {
 634                kfree(dev->pnp.str_obj);
 635                device_remove_file(&dev->dev, &dev_attr_description);
 636        }
 637        /*
 638         * If device has _EJ0, remove 'eject' file.
 639         */
 640        status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 641        if (ACPI_SUCCESS(status))
 642                device_remove_file(&dev->dev, &dev_attr_eject);
 643
 644        status = acpi_get_handle(dev->handle, "_SUN", &temp);
 645        if (ACPI_SUCCESS(status))
 646                device_remove_file(&dev->dev, &dev_attr_sun);
 647
 648        if (dev->pnp.unique_id)
 649                device_remove_file(&dev->dev, &dev_attr_uid);
 650        if (dev->pnp.type.bus_address)
 651                device_remove_file(&dev->dev, &dev_attr_adr);
 652        device_remove_file(&dev->dev, &dev_attr_modalias);
 653        device_remove_file(&dev->dev, &dev_attr_hid);
 654        if (dev->handle)
 655                device_remove_file(&dev->dev, &dev_attr_path);
 656}
 657/* --------------------------------------------------------------------------
 658                        ACPI Bus operations
 659   -------------------------------------------------------------------------- */
 660
 661static const struct acpi_device_id *__acpi_match_device(
 662        struct acpi_device *device, const struct acpi_device_id *ids)
 663{
 664        const struct acpi_device_id *id;
 665        struct acpi_hardware_id *hwid;
 666
 667        /*
 668         * If the device is not present, it is unnecessary to load device
 669         * driver for it.
 670         */
 671        if (!device->status.present)
 672                return NULL;
 673
 674        for (id = ids; id->id[0]; id++)
 675                list_for_each_entry(hwid, &device->pnp.ids, list)
 676                        if (!strcmp((char *) id->id, hwid->id))
 677                                return id;
 678
 679        return NULL;
 680}
 681
 682/**
 683 * acpi_match_device - Match a struct device against a given list of ACPI IDs
 684 * @ids: Array of struct acpi_device_id object to match against.
 685 * @dev: The device structure to match.
 686 *
 687 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 688 * object for that handle and use that object to match against a given list of
 689 * device IDs.
 690 *
 691 * Return a pointer to the first matching ID on success or %NULL on failure.
 692 */
 693const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 694                                               const struct device *dev)
 695{
 696        struct acpi_device *adev;
 697        acpi_handle handle = ACPI_HANDLE(dev);
 698
 699        if (!ids || !handle || acpi_bus_get_device(handle, &adev))
 700                return NULL;
 701
 702        return __acpi_match_device(adev, ids);
 703}
 704EXPORT_SYMBOL_GPL(acpi_match_device);
 705
 706int acpi_match_device_ids(struct acpi_device *device,
 707                          const struct acpi_device_id *ids)
 708{
 709        return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 710}
 711EXPORT_SYMBOL(acpi_match_device_ids);
 712
 713static void acpi_free_power_resources_lists(struct acpi_device *device)
 714{
 715        int i;
 716
 717        if (device->wakeup.flags.valid)
 718                acpi_power_resources_list_free(&device->wakeup.resources);
 719
 720        if (!device->flags.power_manageable)
 721                return;
 722
 723        for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 724                struct acpi_device_power_state *ps = &device->power.states[i];
 725                acpi_power_resources_list_free(&ps->resources);
 726        }
 727}
 728
 729static void acpi_device_release(struct device *dev)
 730{
 731        struct acpi_device *acpi_dev = to_acpi_device(dev);
 732
 733        acpi_free_pnp_ids(&acpi_dev->pnp);
 734        acpi_free_power_resources_lists(acpi_dev);
 735        kfree(acpi_dev);
 736}
 737
 738static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 739{
 740        struct acpi_device *acpi_dev = to_acpi_device(dev);
 741        struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 742
 743        return acpi_dev->flags.match_driver
 744                && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 745}
 746
 747static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 748{
 749        struct acpi_device *acpi_dev = to_acpi_device(dev);
 750        int len;
 751
 752        if (list_empty(&acpi_dev->pnp.ids))
 753                return 0;
 754
 755        if (add_uevent_var(env, "MODALIAS="))
 756                return -ENOMEM;
 757        len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 758                              sizeof(env->buf) - env->buflen);
 759        if (len >= (sizeof(env->buf) - env->buflen))
 760                return -ENOMEM;
 761        env->buflen += len;
 762        return 0;
 763}
 764
 765static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 766{
 767        struct acpi_device *device = data;
 768
 769        device->driver->ops.notify(device, event);
 770}
 771
 772static acpi_status acpi_device_notify_fixed(void *data)
 773{
 774        struct acpi_device *device = data;
 775
 776        /* Fixed hardware devices have no handles */
 777        acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 778        return AE_OK;
 779}
 780
 781static int acpi_device_install_notify_handler(struct acpi_device *device)
 782{
 783        acpi_status status;
 784
 785        if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 786                status =
 787                    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 788                                                     acpi_device_notify_fixed,
 789                                                     device);
 790        else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 791                status =
 792                    acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 793                                                     acpi_device_notify_fixed,
 794                                                     device);
 795        else
 796                status = acpi_install_notify_handler(device->handle,
 797                                                     ACPI_DEVICE_NOTIFY,
 798                                                     acpi_device_notify,
 799                                                     device);
 800
 801        if (ACPI_FAILURE(status))
 802                return -EINVAL;
 803        return 0;
 804}
 805
 806static void acpi_device_remove_notify_handler(struct acpi_device *device)
 807{
 808        if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 809                acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 810                                                acpi_device_notify_fixed);
 811        else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 812                acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 813                                                acpi_device_notify_fixed);
 814        else
 815                acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 816                                           acpi_device_notify);
 817}
 818
 819static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 820static int acpi_device_probe(struct device * dev)
 821{
 822        struct acpi_device *acpi_dev = to_acpi_device(dev);
 823        struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 824        int ret;
 825
 826        ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 827        if (!ret) {
 828                if (acpi_drv->ops.notify) {
 829                        ret = acpi_device_install_notify_handler(acpi_dev);
 830                        if (ret) {
 831                                if (acpi_drv->ops.remove)
 832                                        acpi_drv->ops.remove(acpi_dev);
 833                                acpi_dev->driver = NULL;
 834                                acpi_dev->driver_data = NULL;
 835                                return ret;
 836                        }
 837                }
 838
 839                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 840                        "Found driver [%s] for device [%s]\n",
 841                        acpi_drv->name, acpi_dev->pnp.bus_id));
 842                get_device(dev);
 843        }
 844        return ret;
 845}
 846
 847static int acpi_device_remove(struct device * dev)
 848{
 849        struct acpi_device *acpi_dev = to_acpi_device(dev);
 850        struct acpi_driver *acpi_drv = acpi_dev->driver;
 851
 852        if (acpi_drv) {
 853                if (acpi_drv->ops.notify)
 854                        acpi_device_remove_notify_handler(acpi_dev);
 855                if (acpi_drv->ops.remove)
 856                        acpi_drv->ops.remove(acpi_dev);
 857        }
 858        acpi_dev->driver = NULL;
 859        acpi_dev->driver_data = NULL;
 860
 861        put_device(dev);
 862        return 0;
 863}
 864
 865struct bus_type acpi_bus_type = {
 866        .name           = "acpi",
 867        .match          = acpi_bus_match,
 868        .probe          = acpi_device_probe,
 869        .remove         = acpi_device_remove,
 870        .uevent         = acpi_device_uevent,
 871};
 872
 873int acpi_device_add(struct acpi_device *device,
 874                    void (*release)(struct device *))
 875{
 876        int result;
 877        struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 878        int found = 0;
 879
 880        if (device->handle) {
 881                acpi_status status;
 882
 883                status = acpi_attach_data(device->handle, acpi_bus_data_handler,
 884                                          device);
 885                if (ACPI_FAILURE(status)) {
 886                        acpi_handle_err(device->handle,
 887                                        "Unable to attach device data\n");
 888                        return -ENODEV;
 889                }
 890        }
 891
 892        /*
 893         * Linkage
 894         * -------
 895         * Link this device to its parent and siblings.
 896         */
 897        INIT_LIST_HEAD(&device->children);
 898        INIT_LIST_HEAD(&device->node);
 899        INIT_LIST_HEAD(&device->wakeup_list);
 900        INIT_LIST_HEAD(&device->physical_node_list);
 901        mutex_init(&device->physical_node_lock);
 902        INIT_LIST_HEAD(&device->power_dependent);
 903
 904        new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 905        if (!new_bus_id) {
 906                pr_err(PREFIX "Memory allocation error\n");
 907                result = -ENOMEM;
 908                goto err_detach;
 909        }
 910
 911        mutex_lock(&acpi_device_lock);
 912        /*
 913         * Find suitable bus_id and instance number in acpi_bus_id_list
 914         * If failed, create one and link it into acpi_bus_id_list
 915         */
 916        list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 917                if (!strcmp(acpi_device_bus_id->bus_id,
 918                            acpi_device_hid(device))) {
 919                        acpi_device_bus_id->instance_no++;
 920                        found = 1;
 921                        kfree(new_bus_id);
 922                        break;
 923                }
 924        }
 925        if (!found) {
 926                acpi_device_bus_id = new_bus_id;
 927                strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 928                acpi_device_bus_id->instance_no = 0;
 929                list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 930        }
 931        dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 932
 933        if (device->parent)
 934                list_add_tail(&device->node, &device->parent->children);
 935
 936        if (device->wakeup.flags.valid)
 937                list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 938        mutex_unlock(&acpi_device_lock);
 939
 940        if (device->parent)
 941                device->dev.parent = &device->parent->dev;
 942        device->dev.bus = &acpi_bus_type;
 943        device->dev.release = release;
 944        result = device_add(&device->dev);
 945        if (result) {
 946                dev_err(&device->dev, "Error registering device\n");
 947                goto err;
 948        }
 949
 950        result = acpi_device_setup_files(device);
 951        if (result)
 952                printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 953                       dev_name(&device->dev));
 954
 955        device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 956        return 0;
 957
 958 err:
 959        mutex_lock(&acpi_device_lock);
 960        if (device->parent)
 961                list_del(&device->node);
 962        list_del(&device->wakeup_list);
 963        mutex_unlock(&acpi_device_lock);
 964
 965 err_detach:
 966        acpi_detach_data(device->handle, acpi_bus_data_handler);
 967        return result;
 968}
 969
 970static void acpi_device_unregister(struct acpi_device *device)
 971{
 972        mutex_lock(&acpi_device_lock);
 973        if (device->parent)
 974                list_del(&device->node);
 975
 976        list_del(&device->wakeup_list);
 977        mutex_unlock(&acpi_device_lock);
 978
 979        acpi_detach_data(device->handle, acpi_bus_data_handler);
 980
 981        acpi_power_add_remove_device(device, false);
 982        acpi_device_remove_files(device);
 983        if (device->remove)
 984                device->remove(device);
 985
 986        device_del(&device->dev);
 987        /*
 988         * Transition the device to D3cold to drop the reference counts of all
 989         * power resources the device depends on and turn off the ones that have
 990         * no more references.
 991         */
 992        acpi_device_set_power(device, ACPI_STATE_D3_COLD);
 993        device->handle = NULL;
 994        put_device(&device->dev);
 995}
 996
 997/* --------------------------------------------------------------------------
 998                                 Driver Management
 999   -------------------------------------------------------------------------- */
1000/**
1001 * acpi_bus_driver_init - add a device to a driver
1002 * @device: the device to add and initialize
1003 * @driver: driver for the device
1004 *
1005 * Used to initialize a device via its device driver.  Called whenever a
1006 * driver is bound to a device.  Invokes the driver's add() ops.
1007 */
1008static int
1009acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
1010{
1011        int result = 0;
1012
1013        if (!device || !driver)
1014                return -EINVAL;
1015
1016        if (!driver->ops.add)
1017                return -ENOSYS;
1018
1019        result = driver->ops.add(device);
1020        if (result)
1021                return result;
1022
1023        device->driver = driver;
1024
1025        /*
1026         * TBD - Configuration Management: Assign resources to device based
1027         * upon possible configuration and currently allocated resources.
1028         */
1029
1030        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1031                          "Driver successfully bound to device\n"));
1032        return 0;
1033}
1034
1035/**
1036 * acpi_bus_register_driver - register a driver with the ACPI bus
1037 * @driver: driver being registered
1038 *
1039 * Registers a driver with the ACPI bus.  Searches the namespace for all
1040 * devices that match the driver's criteria and binds.  Returns zero for
1041 * success or a negative error status for failure.
1042 */
1043int acpi_bus_register_driver(struct acpi_driver *driver)
1044{
1045        int ret;
1046
1047        if (acpi_disabled)
1048                return -ENODEV;
1049        driver->drv.name = driver->name;
1050        driver->drv.bus = &acpi_bus_type;
1051        driver->drv.owner = driver->owner;
1052
1053        ret = driver_register(&driver->drv);
1054        return ret;
1055}
1056
1057EXPORT_SYMBOL(acpi_bus_register_driver);
1058
1059/**
1060 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1061 * @driver: driver to unregister
1062 *
1063 * Unregisters a driver with the ACPI bus.  Searches the namespace for all
1064 * devices that match the driver's criteria and unbinds.
1065 */
1066void acpi_bus_unregister_driver(struct acpi_driver *driver)
1067{
1068        driver_unregister(&driver->drv);
1069}
1070
1071EXPORT_SYMBOL(acpi_bus_unregister_driver);
1072
1073/* --------------------------------------------------------------------------
1074                                 Device Enumeration
1075   -------------------------------------------------------------------------- */
1076static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1077{
1078        struct acpi_device *device = NULL;
1079        acpi_status status;
1080
1081        /*
1082         * Fixed hardware devices do not appear in the namespace and do not
1083         * have handles, but we fabricate acpi_devices for them, so we have
1084         * to deal with them specially.
1085         */
1086        if (!handle)
1087                return acpi_root;
1088
1089        do {
1090                status = acpi_get_parent(handle, &handle);
1091                if (ACPI_FAILURE(status))
1092                        return status == AE_NULL_ENTRY ? NULL : acpi_root;
1093        } while (acpi_bus_get_device(handle, &device));
1094        return device;
1095}
1096
1097acpi_status
1098acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1099{
1100        acpi_status status;
1101        acpi_handle tmp;
1102        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1103        union acpi_object *obj;
1104
1105        status = acpi_get_handle(handle, "_EJD", &tmp);
1106        if (ACPI_FAILURE(status))
1107                return status;
1108
1109        status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1110        if (ACPI_SUCCESS(status)) {
1111                obj = buffer.pointer;
1112                status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1113                                         ejd);
1114                kfree(buffer.pointer);
1115        }
1116        return status;
1117}
1118EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1119
1120void acpi_bus_data_handler(acpi_handle handle, void *context)
1121{
1122
1123        /* TBD */
1124
1125        return;
1126}
1127
1128static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1129                                        struct acpi_device_wakeup *wakeup)
1130{
1131        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1132        union acpi_object *package = NULL;
1133        union acpi_object *element = NULL;
1134        acpi_status status;
1135        int err = -ENODATA;
1136
1137        if (!wakeup)
1138                return -EINVAL;
1139
1140        INIT_LIST_HEAD(&wakeup->resources);
1141
1142        /* _PRW */
1143        status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1144        if (ACPI_FAILURE(status)) {
1145                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1146                return err;
1147        }
1148
1149        package = (union acpi_object *)buffer.pointer;
1150
1151        if (!package || package->package.count < 2)
1152                goto out;
1153
1154        element = &(package->package.elements[0]);
1155        if (!element)
1156                goto out;
1157
1158        if (element->type == ACPI_TYPE_PACKAGE) {
1159                if ((element->package.count < 2) ||
1160                    (element->package.elements[0].type !=
1161                     ACPI_TYPE_LOCAL_REFERENCE)
1162                    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1163                        goto out;
1164
1165                wakeup->gpe_device =
1166                    element->package.elements[0].reference.handle;
1167                wakeup->gpe_number =
1168                    (u32) element->package.elements[1].integer.value;
1169        } else if (element->type == ACPI_TYPE_INTEGER) {
1170                wakeup->gpe_device = NULL;
1171                wakeup->gpe_number = element->integer.value;
1172        } else {
1173                goto out;
1174        }
1175
1176        element = &(package->package.elements[1]);
1177        if (element->type != ACPI_TYPE_INTEGER)
1178                goto out;
1179
1180        wakeup->sleep_state = element->integer.value;
1181
1182        err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1183        if (err)
1184                goto out;
1185
1186        if (!list_empty(&wakeup->resources)) {
1187                int sleep_state;
1188
1189                err = acpi_power_wakeup_list_init(&wakeup->resources,
1190                                                  &sleep_state);
1191                if (err) {
1192                        acpi_handle_warn(handle, "Retrieving current states "
1193                                         "of wakeup power resources failed\n");
1194                        acpi_power_resources_list_free(&wakeup->resources);
1195                        goto out;
1196                }
1197                if (sleep_state < wakeup->sleep_state) {
1198                        acpi_handle_warn(handle, "Overriding _PRW sleep state "
1199                                         "(S%d) by S%d from power resources\n",
1200                                         (int)wakeup->sleep_state, sleep_state);
1201                        wakeup->sleep_state = sleep_state;
1202                }
1203        }
1204        acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1205
1206 out:
1207        kfree(buffer.pointer);
1208        return err;
1209}
1210
1211static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1212{
1213        struct acpi_device_id button_device_ids[] = {
1214                {"PNP0C0C", 0},
1215                {"PNP0C0D", 0},
1216                {"PNP0C0E", 0},
1217                {"", 0},
1218        };
1219        acpi_status status;
1220        acpi_event_status event_status;
1221
1222        device->wakeup.flags.notifier_present = 0;
1223
1224        /* Power button, Lid switch always enable wakeup */
1225        if (!acpi_match_device_ids(device, button_device_ids)) {
1226                device->wakeup.flags.run_wake = 1;
1227                if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1228                        /* Do not use Lid/sleep button for S5 wakeup */
1229                        if (device->wakeup.sleep_state == ACPI_STATE_S5)
1230                                device->wakeup.sleep_state = ACPI_STATE_S4;
1231                }
1232                device_set_wakeup_capable(&device->dev, true);
1233                return;
1234        }
1235
1236        status = acpi_get_gpe_status(device->wakeup.gpe_device,
1237                                        device->wakeup.gpe_number,
1238                                                &event_status);
1239        if (status == AE_OK)
1240                device->wakeup.flags.run_wake =
1241                                !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1242}
1243
1244static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1245{
1246        acpi_handle temp;
1247        acpi_status status = 0;
1248        int err;
1249
1250        /* Presence of _PRW indicates wake capable */
1251        status = acpi_get_handle(device->handle, "_PRW", &temp);
1252        if (ACPI_FAILURE(status))
1253                return;
1254
1255        err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1256                                                           &device->wakeup);
1257        if (err) {
1258                dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1259                return;
1260        }
1261
1262        device->wakeup.flags.valid = 1;
1263        device->wakeup.prepare_count = 0;
1264        acpi_bus_set_run_wake_flags(device);
1265        /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1266         * system for the ACPI device with the _PRW object.
1267         * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1268         * So it is necessary to call _DSW object first. Only when it is not
1269         * present will the _PSW object used.
1270         */
1271        err = acpi_device_sleep_wake(device, 0, 0, 0);
1272        if (err)
1273                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1274                                "error in _DSW or _PSW evaluation\n"));
1275}
1276
1277static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1278{
1279        struct acpi_device_power_state *ps = &device->power.states[state];
1280        char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1281        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1282        acpi_handle handle;
1283        acpi_status status;
1284
1285        INIT_LIST_HEAD(&ps->resources);
1286
1287        /* Evaluate "_PRx" to get referenced power resources */
1288        status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1289        if (ACPI_SUCCESS(status)) {
1290                union acpi_object *package = buffer.pointer;
1291
1292                if (buffer.length && package
1293                    && package->type == ACPI_TYPE_PACKAGE
1294                    && package->package.count) {
1295                        int err = acpi_extract_power_resources(package, 0,
1296                                                               &ps->resources);
1297                        if (!err)
1298                                device->power.flags.power_resources = 1;
1299                }
1300                ACPI_FREE(buffer.pointer);
1301        }
1302
1303        /* Evaluate "_PSx" to see if we can do explicit sets */
1304        pathname[2] = 'S';
1305        status = acpi_get_handle(device->handle, pathname, &handle);
1306        if (ACPI_SUCCESS(status))
1307                ps->flags.explicit_set = 1;
1308
1309        /*
1310         * State is valid if there are means to put the device into it.
1311         * D3hot is only valid if _PR3 present.
1312         */
1313        if (!list_empty(&ps->resources)
1314            || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1315                ps->flags.valid = 1;
1316                ps->flags.os_accessible = 1;
1317        }
1318
1319        ps->power = -1;         /* Unknown - driver assigned */
1320        ps->latency = -1;       /* Unknown - driver assigned */
1321}
1322
1323static void acpi_bus_get_power_flags(struct acpi_device *device)
1324{
1325        acpi_status status;
1326        acpi_handle handle;
1327        u32 i;
1328
1329        /* Presence of _PS0|_PR0 indicates 'power manageable' */
1330        status = acpi_get_handle(device->handle, "_PS0", &handle);
1331        if (ACPI_FAILURE(status)) {
1332                status = acpi_get_handle(device->handle, "_PR0", &handle);
1333                if (ACPI_FAILURE(status))
1334                        return;
1335        }
1336
1337        device->flags.power_manageable = 1;
1338
1339        /*
1340         * Power Management Flags
1341         */
1342        status = acpi_get_handle(device->handle, "_PSC", &handle);
1343        if (ACPI_SUCCESS(status))
1344                device->power.flags.explicit_get = 1;
1345        status = acpi_get_handle(device->handle, "_IRC", &handle);
1346        if (ACPI_SUCCESS(status))
1347                device->power.flags.inrush_current = 1;
1348
1349        /*
1350         * Enumerate supported power management states
1351         */
1352        for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1353                acpi_bus_init_power_state(device, i);
1354
1355        INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1356
1357        /* Set defaults for D0 and D3 states (always valid) */
1358        device->power.states[ACPI_STATE_D0].flags.valid = 1;
1359        device->power.states[ACPI_STATE_D0].power = 100;
1360        device->power.states[ACPI_STATE_D3].flags.valid = 1;
1361        device->power.states[ACPI_STATE_D3].power = 0;
1362
1363        /* Set D3cold's explicit_set flag if _PS3 exists. */
1364        if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1365                device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1366
1367        /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1368        if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1369                        device->power.flags.power_resources)
1370                device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1371
1372        if (acpi_bus_init_power(device)) {
1373                acpi_free_power_resources_lists(device);
1374                device->flags.power_manageable = 0;
1375        }
1376}
1377
1378static void acpi_bus_get_flags(struct acpi_device *device)
1379{
1380        acpi_status status = AE_OK;
1381        acpi_handle temp = NULL;
1382
1383        /* Presence of _STA indicates 'dynamic_status' */
1384        status = acpi_get_handle(device->handle, "_STA", &temp);
1385        if (ACPI_SUCCESS(status))
1386                device->flags.dynamic_status = 1;
1387
1388        /* Presence of _RMV indicates 'removable' */
1389        status = acpi_get_handle(device->handle, "_RMV", &temp);
1390        if (ACPI_SUCCESS(status))
1391                device->flags.removable = 1;
1392
1393        /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1394        status = acpi_get_handle(device->handle, "_EJD", &temp);
1395        if (ACPI_SUCCESS(status))
1396                device->flags.ejectable = 1;
1397        else {
1398                status = acpi_get_handle(device->handle, "_EJ0", &temp);
1399                if (ACPI_SUCCESS(status))
1400                        device->flags.ejectable = 1;
1401        }
1402}
1403
1404static void acpi_device_get_busid(struct acpi_device *device)
1405{
1406        char bus_id[5] = { '?', 0 };
1407        struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1408        int i = 0;
1409
1410        /*
1411         * Bus ID
1412         * ------
1413         * The device's Bus ID is simply the object name.
1414         * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1415         */
1416        if (ACPI_IS_ROOT_DEVICE(device)) {
1417                strcpy(device->pnp.bus_id, "ACPI");
1418                return;
1419        }
1420
1421        switch (device->device_type) {
1422        case ACPI_BUS_TYPE_POWER_BUTTON:
1423                strcpy(device->pnp.bus_id, "PWRF");
1424                break;
1425        case ACPI_BUS_TYPE_SLEEP_BUTTON:
1426                strcpy(device->pnp.bus_id, "SLPF");
1427                break;
1428        default:
1429                acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1430                /* Clean up trailing underscores (if any) */
1431                for (i = 3; i > 1; i--) {
1432                        if (bus_id[i] == '_')
1433                                bus_id[i] = '\0';
1434                        else
1435                                break;
1436                }
1437                strcpy(device->pnp.bus_id, bus_id);
1438                break;
1439        }
1440}
1441
1442/*
1443 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1444 *
1445 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1446 * then we can safely call it an ejectable drive bay
1447 */
1448static int acpi_bay_match(acpi_handle handle)
1449{
1450        acpi_status status;
1451        acpi_handle tmp;
1452        acpi_handle phandle;
1453
1454        status = acpi_get_handle(handle, "_EJ0", &tmp);
1455        if (ACPI_FAILURE(status))
1456                return -ENODEV;
1457
1458        if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1459                (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1460                (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1461                (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1462                return 0;
1463
1464        if (acpi_get_parent(handle, &phandle))
1465                return -ENODEV;
1466
1467        if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1468                (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1469                (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1470                (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1471                return 0;
1472
1473        return -ENODEV;
1474}
1475
1476/*
1477 * acpi_dock_match - see if an acpi object has a _DCK method
1478 */
1479static int acpi_dock_match(acpi_handle handle)
1480{
1481        acpi_handle tmp;
1482        return acpi_get_handle(handle, "_DCK", &tmp);
1483}
1484
1485const char *acpi_device_hid(struct acpi_device *device)
1486{
1487        struct acpi_hardware_id *hid;
1488
1489        if (list_empty(&device->pnp.ids))
1490                return dummy_hid;
1491
1492        hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1493        return hid->id;
1494}
1495EXPORT_SYMBOL(acpi_device_hid);
1496
1497static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1498{
1499        struct acpi_hardware_id *id;
1500
1501        id = kmalloc(sizeof(*id), GFP_KERNEL);
1502        if (!id)
1503                return;
1504
1505        id->id = kstrdup(dev_id, GFP_KERNEL);
1506        if (!id->id) {
1507                kfree(id);
1508                return;
1509        }
1510
1511        list_add_tail(&id->list, &pnp->ids);
1512        pnp->type.hardware_id = 1;
1513}
1514
1515/*
1516 * Old IBM workstations have a DSDT bug wherein the SMBus object
1517 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1518 * prefix.  Work around this.
1519 */
1520static int acpi_ibm_smbus_match(acpi_handle handle)
1521{
1522        acpi_handle h_dummy;
1523        struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1524        int result;
1525
1526        if (!dmi_name_in_vendors("IBM"))
1527                return -ENODEV;
1528
1529        /* Look for SMBS object */
1530        result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
1531        if (result)
1532                return result;
1533
1534        if (strcmp("SMBS", path.pointer)) {
1535                result = -ENODEV;
1536                goto out;
1537        }
1538
1539        /* Does it have the necessary (but misnamed) methods? */
1540        result = -ENODEV;
1541        if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
1542            ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
1543            ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
1544                result = 0;
1545out:
1546        kfree(path.pointer);
1547        return result;
1548}
1549
1550static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1551                                int device_type)
1552{
1553        acpi_status status;
1554        struct acpi_device_info *info;
1555        struct acpi_pnp_device_id_list *cid_list;
1556        int i;
1557
1558        switch (device_type) {
1559        case ACPI_BUS_TYPE_DEVICE:
1560                if (handle == ACPI_ROOT_OBJECT) {
1561                        acpi_add_id(pnp, ACPI_SYSTEM_HID);
1562                        break;
1563                }
1564
1565                status = acpi_get_object_info(handle, &info);
1566                if (ACPI_FAILURE(status)) {
1567                        pr_err(PREFIX "%s: Error reading device info\n",
1568                                        __func__);
1569                        return;
1570                }
1571
1572                if (info->valid & ACPI_VALID_HID)
1573                        acpi_add_id(pnp, info->hardware_id.string);
1574                if (info->valid & ACPI_VALID_CID) {
1575                        cid_list = &info->compatible_id_list;
1576                        for (i = 0; i < cid_list->count; i++)
1577                                acpi_add_id(pnp, cid_list->ids[i].string);
1578                }
1579                if (info->valid & ACPI_VALID_ADR) {
1580                        pnp->bus_address = info->address;
1581                        pnp->type.bus_address = 1;
1582                }
1583                if (info->valid & ACPI_VALID_UID)
1584                        pnp->unique_id = kstrdup(info->unique_id.string,
1585                                                        GFP_KERNEL);
1586
1587                kfree(info);
1588
1589                /*
1590                 * Some devices don't reliably have _HIDs & _CIDs, so add
1591                 * synthetic HIDs to make sure drivers can find them.
1592                 */
1593                if (acpi_is_video_device(handle))
1594                        acpi_add_id(pnp, ACPI_VIDEO_HID);
1595                else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1596                        acpi_add_id(pnp, ACPI_BAY_HID);
1597                else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1598                        acpi_add_id(pnp, ACPI_DOCK_HID);
1599                else if (!acpi_ibm_smbus_match(handle))
1600                        acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1601                else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1602                        acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1603                        strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1604                        strcpy(pnp->device_class, ACPI_BUS_CLASS);
1605                }
1606
1607                break;
1608        case ACPI_BUS_TYPE_POWER:
1609                acpi_add_id(pnp, ACPI_POWER_HID);
1610                break;
1611        case ACPI_BUS_TYPE_PROCESSOR:
1612                acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1613                break;
1614        case ACPI_BUS_TYPE_THERMAL:
1615                acpi_add_id(pnp, ACPI_THERMAL_HID);
1616                break;
1617        case ACPI_BUS_TYPE_POWER_BUTTON:
1618                acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1619                break;
1620        case ACPI_BUS_TYPE_SLEEP_BUTTON:
1621                acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1622                break;
1623        }
1624}
1625
1626void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1627{
1628        struct acpi_hardware_id *id, *tmp;
1629
1630        list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1631                kfree(id->id);
1632                kfree(id);
1633        }
1634        kfree(pnp->unique_id);
1635}
1636
1637void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1638                             int type, unsigned long long sta)
1639{
1640        INIT_LIST_HEAD(&device->pnp.ids);
1641        device->device_type = type;
1642        device->handle = handle;
1643        device->parent = acpi_bus_get_parent(handle);
1644        STRUCT_TO_INT(device->status) = sta;
1645        acpi_device_get_busid(device);
1646        acpi_set_pnp_ids(handle, &device->pnp, type);
1647        acpi_bus_get_flags(device);
1648        device->flags.match_driver = false;
1649        device_initialize(&device->dev);
1650        dev_set_uevent_suppress(&device->dev, true);
1651}
1652
1653void acpi_device_add_finalize(struct acpi_device *device)
1654{
1655        device->flags.match_driver = true;
1656        dev_set_uevent_suppress(&device->dev, false);
1657        kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1658}
1659
1660static int acpi_add_single_object(struct acpi_device **child,
1661                                  acpi_handle handle, int type,
1662                                  unsigned long long sta)
1663{
1664        int result;
1665        struct acpi_device *device;
1666        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1667
1668        device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1669        if (!device) {
1670                printk(KERN_ERR PREFIX "Memory allocation error\n");
1671                return -ENOMEM;
1672        }
1673
1674        acpi_init_device_object(device, handle, type, sta);
1675        acpi_bus_get_power_flags(device);
1676        acpi_bus_get_wakeup_device_flags(device);
1677
1678        result = acpi_device_add(device, acpi_device_release);
1679        if (result) {
1680                acpi_device_release(&device->dev);
1681                return result;
1682        }
1683
1684        acpi_power_add_remove_device(device, true);
1685        acpi_device_add_finalize(device);
1686        acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1687        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1688                dev_name(&device->dev), (char *) buffer.pointer,
1689                device->parent ? dev_name(&device->parent->dev) : "(null)"));
1690        kfree(buffer.pointer);
1691        *child = device;
1692        return 0;
1693}
1694
1695static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1696                                    unsigned long long *sta)
1697{
1698        acpi_status status;
1699        acpi_object_type acpi_type;
1700
1701        status = acpi_get_type(handle, &acpi_type);
1702        if (ACPI_FAILURE(status))
1703                return -ENODEV;
1704
1705        switch (acpi_type) {
1706        case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1707        case ACPI_TYPE_DEVICE:
1708                *type = ACPI_BUS_TYPE_DEVICE;
1709                status = acpi_bus_get_status_handle(handle, sta);
1710                if (ACPI_FAILURE(status))
1711                        return -ENODEV;
1712                break;
1713        case ACPI_TYPE_PROCESSOR:
1714                *type = ACPI_BUS_TYPE_PROCESSOR;
1715                status = acpi_bus_get_status_handle(handle, sta);
1716                if (ACPI_FAILURE(status))
1717                        return -ENODEV;
1718                break;
1719        case ACPI_TYPE_THERMAL:
1720                *type = ACPI_BUS_TYPE_THERMAL;
1721                *sta = ACPI_STA_DEFAULT;
1722                break;
1723        case ACPI_TYPE_POWER:
1724                *type = ACPI_BUS_TYPE_POWER;
1725                *sta = ACPI_STA_DEFAULT;
1726                break;
1727        default:
1728                return -ENODEV;
1729        }
1730
1731        return 0;
1732}
1733
1734static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1735                                       char *idstr,
1736                                       const struct acpi_device_id **matchid)
1737{
1738        const struct acpi_device_id *devid;
1739
1740        for (devid = handler->ids; devid->id[0]; devid++)
1741                if (!strcmp((char *)devid->id, idstr)) {
1742                        if (matchid)
1743                                *matchid = devid;
1744
1745                        return true;
1746                }
1747
1748        return false;
1749}
1750
1751static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1752                                        const struct acpi_device_id **matchid)
1753{
1754        struct acpi_scan_handler *handler;
1755
1756        list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1757                if (acpi_scan_handler_matching(handler, idstr, matchid))
1758                        return handler;
1759
1760        return NULL;
1761}
1762
1763void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1764{
1765        if (!!hotplug->enabled == !!val)
1766                return;
1767
1768        mutex_lock(&acpi_scan_lock);
1769
1770        hotplug->enabled = val;
1771
1772        mutex_unlock(&acpi_scan_lock);
1773}
1774
1775static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1776{
1777        struct acpi_device_pnp pnp = {};
1778        struct acpi_hardware_id *hwid;
1779        struct acpi_scan_handler *handler;
1780
1781        INIT_LIST_HEAD(&pnp.ids);
1782        acpi_set_pnp_ids(handle, &pnp, type);
1783
1784        if (!pnp.type.hardware_id)
1785                goto out;
1786
1787        /*
1788         * This relies on the fact that acpi_install_notify_handler() will not
1789         * install the same notify handler routine twice for the same handle.
1790         */
1791        list_for_each_entry(hwid, &pnp.ids, list) {
1792                handler = acpi_scan_match_handler(hwid->id, NULL);
1793                if (handler) {
1794                        acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1795                                        acpi_hotplug_notify_cb, handler);
1796                        break;
1797                }
1798        }
1799
1800out:
1801        acpi_free_pnp_ids(&pnp);
1802}
1803
1804static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1805                                      void *not_used, void **return_value)
1806{
1807        struct acpi_device *device = NULL;
1808        int type;
1809        unsigned long long sta;
1810        acpi_status status;
1811        int result;
1812
1813        acpi_bus_get_device(handle, &device);
1814        if (device)
1815                goto out;
1816
1817        result = acpi_bus_type_and_status(handle, &type, &sta);
1818        if (result)
1819                return AE_OK;
1820
1821        if (type == ACPI_BUS_TYPE_POWER) {
1822                acpi_add_power_resource(handle);
1823                return AE_OK;
1824        }
1825
1826        acpi_scan_init_hotplug(handle, type);
1827
1828        if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1829            !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1830                struct acpi_device_wakeup wakeup;
1831                acpi_handle temp;
1832
1833                status = acpi_get_handle(handle, "_PRW", &temp);
1834                if (ACPI_SUCCESS(status)) {
1835                        acpi_bus_extract_wakeup_device_power_package(handle,
1836                                                                     &wakeup);
1837                        acpi_power_resources_list_free(&wakeup.resources);
1838                }
1839                return AE_CTRL_DEPTH;
1840        }
1841
1842        acpi_add_single_object(&device, handle, type, sta);
1843        if (!device)
1844                return AE_CTRL_DEPTH;
1845
1846 out:
1847        if (!*return_value)
1848                *return_value = device;
1849
1850        return AE_OK;
1851}
1852
1853static int acpi_scan_attach_handler(struct acpi_device *device)
1854{
1855        struct acpi_hardware_id *hwid;
1856        int ret = 0;
1857
1858        list_for_each_entry(hwid, &device->pnp.ids, list) {
1859                const struct acpi_device_id *devid;
1860                struct acpi_scan_handler *handler;
1861
1862                handler = acpi_scan_match_handler(hwid->id, &devid);
1863                if (handler) {
1864                        ret = handler->attach(device, devid);
1865                        if (ret > 0) {
1866                                device->handler = handler;
1867                                break;
1868                        } else if (ret < 0) {
1869                                break;
1870                        }
1871                }
1872        }
1873        return ret;
1874}
1875
1876static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1877                                          void *not_used, void **ret_not_used)
1878{
1879        struct acpi_device *device;
1880        unsigned long long sta_not_used;
1881        int ret;
1882
1883        /*
1884         * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1885         * namespace walks prematurely.
1886         */
1887        if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1888                return AE_OK;
1889
1890        if (acpi_bus_get_device(handle, &device))
1891                return AE_CTRL_DEPTH;
1892
1893        ret = acpi_scan_attach_handler(device);
1894        if (ret)
1895                return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1896
1897        ret = device_attach(&device->dev);
1898        return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1899}
1900
1901/**
1902 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1903 * @handle: Root of the namespace scope to scan.
1904 *
1905 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1906 * found devices.
1907 *
1908 * If no devices were found, -ENODEV is returned, but it does not mean that
1909 * there has been a real error.  There just have been no suitable ACPI objects
1910 * in the table trunk from which the kernel could create a device and add an
1911 * appropriate driver.
1912 *
1913 * Must be called under acpi_scan_lock.
1914 */
1915int acpi_bus_scan(acpi_handle handle)
1916{
1917        void *device = NULL;
1918        int error = 0;
1919
1920        if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1921                acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1922                                    acpi_bus_check_add, NULL, NULL, &device);
1923
1924        if (!device)
1925                error = -ENODEV;
1926        else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1927                acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1928                                    acpi_bus_device_attach, NULL, NULL, NULL);
1929
1930        return error;
1931}
1932EXPORT_SYMBOL(acpi_bus_scan);
1933
1934static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1935                                          void *not_used, void **ret_not_used)
1936{
1937        struct acpi_device *device = NULL;
1938
1939        if (!acpi_bus_get_device(handle, &device)) {
1940                struct acpi_scan_handler *dev_handler = device->handler;
1941
1942                device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1943                if (dev_handler) {
1944                        if (dev_handler->detach)
1945                                dev_handler->detach(device);
1946
1947                        device->handler = NULL;
1948                } else {
1949                        device_release_driver(&device->dev);
1950                }
1951        }
1952        return AE_OK;
1953}
1954
1955static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1956                                   void *not_used, void **ret_not_used)
1957{
1958        struct acpi_device *device = NULL;
1959
1960        if (!acpi_bus_get_device(handle, &device))
1961                acpi_device_unregister(device);
1962
1963        return AE_OK;
1964}
1965
1966/**
1967 * acpi_bus_trim - Remove ACPI device node and all of its descendants
1968 * @start: Root of the ACPI device nodes subtree to remove.
1969 *
1970 * Must be called under acpi_scan_lock.
1971 */
1972void acpi_bus_trim(struct acpi_device *start)
1973{
1974        /*
1975         * Execute acpi_bus_device_detach() as a post-order callback to detach
1976         * all ACPI drivers from the device nodes being removed.
1977         */
1978        acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1979                            acpi_bus_device_detach, NULL, NULL);
1980        acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1981        /*
1982         * Execute acpi_bus_remove() as a post-order callback to remove device
1983         * nodes in the given namespace scope.
1984         */
1985        acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1986                            acpi_bus_remove, NULL, NULL);
1987        acpi_bus_remove(start->handle, 0, NULL, NULL);
1988}
1989EXPORT_SYMBOL_GPL(acpi_bus_trim);
1990
1991static int acpi_bus_scan_fixed(void)
1992{
1993        int result = 0;
1994
1995        /*
1996         * Enumerate all fixed-feature devices.
1997         */
1998        if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1999                struct acpi_device *device = NULL;
2000
2001                result = acpi_add_single_object(&device, NULL,
2002                                                ACPI_BUS_TYPE_POWER_BUTTON,
2003                                                ACPI_STA_DEFAULT);
2004                if (result)
2005                        return result;
2006
2007                result = device_attach(&device->dev);
2008                if (result < 0)
2009                        return result;
2010
2011                device_init_wakeup(&device->dev, true);
2012        }
2013
2014        if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2015                struct acpi_device *device = NULL;
2016
2017                result = acpi_add_single_object(&device, NULL,
2018                                                ACPI_BUS_TYPE_SLEEP_BUTTON,
2019                                                ACPI_STA_DEFAULT);
2020                if (result)
2021                        return result;
2022
2023                result = device_attach(&device->dev);
2024        }
2025
2026        return result < 0 ? result : 0;
2027}
2028
2029int __init acpi_scan_init(void)
2030{
2031        int result;
2032
2033        result = bus_register(&acpi_bus_type);
2034        if (result) {
2035                /* We don't want to quit even if we failed to add suspend/resume */
2036                printk(KERN_ERR PREFIX "Could not register bus type\n");
2037        }
2038
2039        acpi_pci_root_init();
2040        acpi_pci_link_init();
2041        acpi_platform_init();
2042        acpi_lpss_init();
2043        acpi_container_init();
2044        acpi_memory_hotplug_init();
2045        acpi_dock_init();
2046
2047        mutex_lock(&acpi_scan_lock);
2048        /*
2049         * Enumerate devices in the ACPI namespace.
2050         */
2051        result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2052        if (result)
2053                goto out;
2054
2055        result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2056        if (result)
2057                goto out;
2058
2059        result = acpi_bus_scan_fixed();
2060        if (result) {
2061                acpi_device_unregister(acpi_root);
2062                goto out;
2063        }
2064
2065        acpi_update_all_gpes();
2066
2067        acpi_pci_root_hp_init();
2068
2069 out:
2070        mutex_unlock(&acpi_scan_lock);
2071        return result;
2072}
2073
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