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
  30/*
  31 * If set, devices will be hot-removed even if they cannot be put offline
  32 * gracefully (from the kernel's standpoint).
  33 */
  34bool acpi_force_hot_remove;
  35
  36static const char *dummy_hid = "device";
  37
  38static LIST_HEAD(acpi_bus_id_list);
  39static DEFINE_MUTEX(acpi_scan_lock);
  40static LIST_HEAD(acpi_scan_handlers_list);
  41DEFINE_MUTEX(acpi_device_lock);
  42LIST_HEAD(acpi_wakeup_device_list);
  43
  44struct acpi_device_bus_id{
  45        char bus_id[15];
  46        unsigned int instance_no;
  47        struct list_head node;
  48};
  49
  50void acpi_scan_lock_acquire(void)
  51{
  52        mutex_lock(&acpi_scan_lock);
  53}
  54EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  55
  56void acpi_scan_lock_release(void)
  57{
  58        mutex_unlock(&acpi_scan_lock);
  59}
  60EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  61
  62int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  63{
  64        if (!handler || !handler->attach)
  65                return -EINVAL;
  66
  67        list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  68        return 0;
  69}
  70
  71int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
  72                                       const char *hotplug_profile_name)
  73{
  74        int error;
  75
  76        error = acpi_scan_add_handler(handler);
  77        if (error)
  78                return error;
  79
  80        acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
  81        return 0;
  82}
  83
  84/*
  85 * Creates hid/cid(s) string needed for modalias and uevent
  86 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  87 * char *modalias: "acpi:IBM0001:ACPI0001"
  88*/
  89static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  90                           int size)
  91{
  92        int len;
  93        int count;
  94        struct acpi_hardware_id *id;
  95
  96        if (list_empty(&acpi_dev->pnp.ids))
  97                return 0;
  98
  99        len = snprintf(modalias, size, "acpi:");
 100        size -= len;
 101
 102        list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
 103                count = snprintf(&modalias[len], size, "%s:", id->id);
 104                if (count < 0 || count >= size)
 105                        return -EINVAL;
 106                len += count;
 107                size -= count;
 108        }
 109
 110        modalias[len] = '\0';
 111        return len;
 112}
 113
 114static ssize_t
 115acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
 116        struct acpi_device *acpi_dev = to_acpi_device(dev);
 117        int len;
 118
 119        /* Device has no HID and no CID or string is >1024 */
 120        len = create_modalias(acpi_dev, buf, 1024);
 121        if (len <= 0)
 122                return 0;
 123        buf[len++] = '\n';
 124        return len;
 125}
 126static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 127
 128static acpi_status acpi_bus_offline_companions(acpi_handle handle, u32 lvl,
 129                                               void *data, void **ret_p)
 130{
 131        struct acpi_device *device = NULL;
 132        struct acpi_device_physical_node *pn;
 133        bool second_pass = (bool)data;
 134        acpi_status status = AE_OK;
 135
 136        if (acpi_bus_get_device(handle, &device))
 137                return AE_OK;
 138
 139        mutex_lock(&device->physical_node_lock);
 140
 141        list_for_each_entry(pn, &device->physical_node_list, node) {
 142                int ret;
 143
 144                if (second_pass) {
 145                        /* Skip devices offlined by the first pass. */
 146                        if (pn->put_online)
 147                                continue;
 148                } else {
 149                        pn->put_online = false;
 150                }
 151                ret = device_offline(pn->dev);
 152                if (acpi_force_hot_remove)
 153                        continue;
 154
 155                if (ret >= 0) {
 156                        pn->put_online = !ret;
 157                } else {
 158                        *ret_p = pn->dev;
 159                        if (second_pass) {
 160                                status = AE_ERROR;
 161                                break;
 162                        }
 163                }
 164        }
 165
 166        mutex_unlock(&device->physical_node_lock);
 167
 168        return status;
 169}
 170
 171static acpi_status acpi_bus_online_companions(acpi_handle handle, u32 lvl,
 172                                              void *data, void **ret_p)
 173{
 174        struct acpi_device *device = NULL;
 175        struct acpi_device_physical_node *pn;
 176
 177        if (acpi_bus_get_device(handle, &device))
 178                return AE_OK;
 179
 180        mutex_lock(&device->physical_node_lock);
 181
 182        list_for_each_entry(pn, &device->physical_node_list, node)
 183                if (pn->put_online) {
 184                        device_online(pn->dev);
 185                        pn->put_online = false;
 186                }
 187
 188        mutex_unlock(&device->physical_node_lock);
 189
 190        return AE_OK;
 191}
 192
 193static int acpi_scan_hot_remove(struct acpi_device *device)
 194{
 195        acpi_handle handle = device->handle;
 196        acpi_handle not_used;
 197        struct acpi_object_list arg_list;
 198        union acpi_object arg;
 199        struct device *errdev;
 200        acpi_status status;
 201        unsigned long long sta;
 202
 203        /* If there is no handle, the device node has been unregistered. */
 204        if (!handle) {
 205                dev_dbg(&device->dev, "ACPI handle missing\n");
 206                put_device(&device->dev);
 207                return -EINVAL;
 208        }
 209
 210        lock_device_hotplug();
 211
 212        /*
 213         * Carry out two passes here and ignore errors in the first pass,
 214         * because if the devices in question are memory blocks and
 215         * CONFIG_MEMCG is set, one of the blocks may hold data structures
 216         * that the other blocks depend on, but it is not known in advance which
 217         * block holds them.
 218         *
 219         * If the first pass is successful, the second one isn't needed, though.
 220         */
 221        errdev = NULL;
 222        acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 223                            NULL, acpi_bus_offline_companions,
 224                            (void *)false, (void **)&errdev);
 225        acpi_bus_offline_companions(handle, 0, (void *)false, (void **)&errdev);
 226        if (errdev) {
 227                errdev = NULL;
 228                acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 229                                    NULL, acpi_bus_offline_companions,
 230                                    (void *)true , (void **)&errdev);
 231                if (!errdev || acpi_force_hot_remove)
 232                        acpi_bus_offline_companions(handle, 0, (void *)true,
 233                                                    (void **)&errdev);
 234
 235                if (errdev && !acpi_force_hot_remove) {
 236                        dev_warn(errdev, "Offline failed.\n");
 237                        acpi_bus_online_companions(handle, 0, NULL, NULL);
 238                        acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 239                                            ACPI_UINT32_MAX,
 240                                            acpi_bus_online_companions, NULL,
 241                                            NULL, NULL);
 242
 243                        unlock_device_hotplug();
 244
 245                        put_device(&device->dev);
 246                        return -EBUSY;
 247                }
 248        }
 249
 250        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 251                "Hot-removing device %s...\n", dev_name(&device->dev)));
 252
 253        acpi_bus_trim(device);
 254
 255        unlock_device_hotplug();
 256
 257        /* Device node has been unregistered. */
 258        put_device(&device->dev);
 259        device = NULL;
 260
 261        if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &not_used))) {
 262                arg_list.count = 1;
 263                arg_list.pointer = &arg;
 264                arg.type = ACPI_TYPE_INTEGER;
 265                arg.integer.value = 0;
 266                acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 267        }
 268
 269        arg_list.count = 1;
 270        arg_list.pointer = &arg;
 271        arg.type = ACPI_TYPE_INTEGER;
 272        arg.integer.value = 1;
 273
 274        /*
 275         * TBD: _EJD support.
 276         */
 277        status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 278        if (ACPI_FAILURE(status)) {
 279                if (status == AE_NOT_FOUND) {
 280                        return -ENODEV;
 281                } else {
 282                        acpi_handle_warn(handle, "Eject failed (0x%x)\n",
 283                                                                status);
 284                        return -EIO;
 285                }
 286        }
 287
 288        /*
 289         * Verify if eject was indeed successful.  If not, log an error
 290         * message.  No need to call _OST since _EJ0 call was made OK.
 291         */
 292        status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 293        if (ACPI_FAILURE(status)) {
 294                acpi_handle_warn(handle,
 295                        "Status check after eject failed (0x%x)\n", status);
 296        } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 297                acpi_handle_warn(handle,
 298                        "Eject incomplete - status 0x%llx\n", sta);
 299        }
 300
 301        return 0;
 302}
 303
 304static void acpi_bus_device_eject(void *context)
 305{
 306        acpi_handle handle = context;
 307        struct acpi_device *device = NULL;
 308        struct acpi_scan_handler *handler;
 309        u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 310
 311        mutex_lock(&acpi_scan_lock);
 312
 313        acpi_bus_get_device(handle, &device);
 314        if (!device)
 315                goto err_out;
 316
 317        handler = device->handler;
 318        if (!handler || !handler->hotplug.enabled) {
 319                ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 320                goto err_out;
 321        }
 322        acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
 323                                  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 324        if (handler->hotplug.mode == AHM_CONTAINER) {
 325                device->flags.eject_pending = true;
 326                kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 327        } else {
 328                int error;
 329
 330                get_device(&device->dev);
 331                error = acpi_scan_hot_remove(device);
 332                if (error)
 333                        goto err_out;
 334        }
 335
 336 out:
 337        mutex_unlock(&acpi_scan_lock);
 338        return;
 339
 340 err_out:
 341        acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
 342                                  NULL);
 343        goto out;
 344}
 345
 346static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
 347{
 348        struct acpi_device *device = NULL;
 349        u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 350        int error;
 351
 352        mutex_lock(&acpi_scan_lock);
 353        lock_device_hotplug();
 354
 355        if (ost_source != ACPI_NOTIFY_BUS_CHECK) {
 356                acpi_bus_get_device(handle, &device);
 357                if (device) {
 358                        dev_warn(&device->dev, "Attempt to re-insert\n");
 359                        goto out;
 360                }
 361        }
 362        acpi_evaluate_hotplug_ost(handle, ost_source,
 363                                  ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
 364        error = acpi_bus_scan(handle);
 365        if (error) {
 366                acpi_handle_warn(handle, "Namespace scan failure\n");
 367                goto out;
 368        }
 369        error = acpi_bus_get_device(handle, &device);
 370        if (error) {
 371                acpi_handle_warn(handle, "Missing device node object\n");
 372                goto out;
 373        }
 374        ost_code = ACPI_OST_SC_SUCCESS;
 375        if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
 376                kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 377
 378 out:
 379        unlock_device_hotplug();
 380        acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
 381        mutex_unlock(&acpi_scan_lock);
 382}
 383
 384static void acpi_scan_bus_check(void *context)
 385{
 386        acpi_scan_bus_device_check((acpi_handle)context,
 387                                   ACPI_NOTIFY_BUS_CHECK);
 388}
 389
 390static void acpi_scan_device_check(void *context)
 391{
 392        acpi_scan_bus_device_check((acpi_handle)context,
 393                                   ACPI_NOTIFY_DEVICE_CHECK);
 394}
 395
 396static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
 397{
 398        u32 ost_status;
 399
 400        switch (type) {
 401        case ACPI_NOTIFY_BUS_CHECK:
 402                acpi_handle_debug(handle,
 403                        "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
 404                ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
 405                break;
 406        case ACPI_NOTIFY_DEVICE_CHECK:
 407                acpi_handle_debug(handle,
 408                        "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
 409                ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
 410                break;
 411        case ACPI_NOTIFY_EJECT_REQUEST:
 412                acpi_handle_debug(handle,
 413                        "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
 414                ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 415                break;
 416        default:
 417                /* non-hotplug event; possibly handled by other handler */
 418                return;
 419        }
 420
 421        acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
 422}
 423
 424static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
 425{
 426        acpi_osd_exec_callback callback;
 427        struct acpi_scan_handler *handler = data;
 428        acpi_status status;
 429
 430        if (!handler->hotplug.enabled)
 431                return acpi_hotplug_unsupported(handle, type);
 432
 433        switch (type) {
 434        case ACPI_NOTIFY_BUS_CHECK:
 435                acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 436                callback = acpi_scan_bus_check;
 437                break;
 438        case ACPI_NOTIFY_DEVICE_CHECK:
 439                acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 440                callback = acpi_scan_device_check;
 441                break;
 442        case ACPI_NOTIFY_EJECT_REQUEST:
 443                acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 444                callback = acpi_bus_device_eject;
 445                break;
 446        default:
 447                /* non-hotplug event; possibly handled by other handler */
 448                return;
 449        }
 450        status = acpi_os_hotplug_execute(callback, handle);
 451        if (ACPI_FAILURE(status))
 452                acpi_evaluate_hotplug_ost(handle, type,
 453                                          ACPI_OST_SC_NON_SPECIFIC_FAILURE,
 454                                          NULL);
 455}
 456
 457/**
 458 * acpi_bus_hot_remove_device: hot-remove a device and its children
 459 * @context: struct acpi_eject_event pointer (freed in this func)
 460 *
 461 * Hot-remove a device and its children. This function frees up the
 462 * memory space passed by arg context, so that the caller may call
 463 * this function asynchronously through acpi_os_hotplug_execute().
 464 */
 465void acpi_bus_hot_remove_device(void *context)
 466{
 467        struct acpi_eject_event *ej_event = context;
 468        struct acpi_device *device = ej_event->device;
 469        acpi_handle handle = device->handle;
 470        int error;
 471
 472        mutex_lock(&acpi_scan_lock);
 473
 474        error = acpi_scan_hot_remove(device);
 475        if (error && handle)
 476                acpi_evaluate_hotplug_ost(handle, ej_event->event,
 477                                          ACPI_OST_SC_NON_SPECIFIC_FAILURE,
 478                                          NULL);
 479
 480        mutex_unlock(&acpi_scan_lock);
 481        kfree(context);
 482}
 483EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 484
 485static ssize_t real_power_state_show(struct device *dev,
 486                                     struct device_attribute *attr, char *buf)
 487{
 488        struct acpi_device *adev = to_acpi_device(dev);
 489        int state;
 490        int ret;
 491
 492        ret = acpi_device_get_power(adev, &state);
 493        if (ret)
 494                return ret;
 495
 496        return sprintf(buf, "%s\n", acpi_power_state_string(state));
 497}
 498
 499static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 500
 501static ssize_t power_state_show(struct device *dev,
 502                                struct device_attribute *attr, char *buf)
 503{
 504        struct acpi_device *adev = to_acpi_device(dev);
 505
 506        return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 507}
 508
 509static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 510
 511static ssize_t
 512acpi_eject_store(struct device *d, struct device_attribute *attr,
 513                const char *buf, size_t count)
 514{
 515        struct acpi_device *acpi_device = to_acpi_device(d);
 516        struct acpi_eject_event *ej_event;
 517        acpi_object_type not_used;
 518        acpi_status status;
 519        u32 ost_source;
 520        int ret;
 521
 522        if (!count || buf[0] != '1')
 523                return -EINVAL;
 524
 525        if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
 526            && !acpi_device->driver)
 527                return -ENODEV;
 528
 529        status = acpi_get_type(acpi_device->handle, &not_used);
 530        if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
 531                return -ENODEV;
 532
 533        mutex_lock(&acpi_scan_lock);
 534
 535        if (acpi_device->flags.eject_pending) {
 536                /* ACPI eject notification event. */
 537                ost_source = ACPI_NOTIFY_EJECT_REQUEST;
 538                acpi_device->flags.eject_pending = 0;
 539        } else {
 540                /* Eject initiated by user space. */
 541                ost_source = ACPI_OST_EC_OSPM_EJECT;
 542        }
 543        ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 544        if (!ej_event) {
 545                ret = -ENOMEM;
 546                goto err_out;
 547        }
 548        acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
 549                                  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 550        ej_event->device = acpi_device;
 551        ej_event->event = ost_source;
 552        get_device(&acpi_device->dev);
 553        status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
 554        if (ACPI_FAILURE(status)) {
 555                put_device(&acpi_device->dev);
 556                kfree(ej_event);
 557                ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
 558                goto err_out;
 559        }
 560        ret = count;
 561
 562 out:
 563        mutex_unlock(&acpi_scan_lock);
 564        return ret;
 565
 566 err_out:
 567        acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
 568                                  ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 569        goto out;
 570}
 571
 572static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 573
 574static ssize_t
 575acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 576        struct acpi_device *acpi_dev = to_acpi_device(dev);
 577
 578        return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 579}
 580static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 581
 582static ssize_t acpi_device_uid_show(struct device *dev,
 583                                    struct device_attribute *attr, char *buf)
 584{
 585        struct acpi_device *acpi_dev = to_acpi_device(dev);
 586
 587        return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 588}
 589static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 590
 591static ssize_t acpi_device_adr_show(struct device *dev,
 592                                    struct device_attribute *attr, char *buf)
 593{
 594        struct acpi_device *acpi_dev = to_acpi_device(dev);
 595
 596        return sprintf(buf, "0x%08x\n",
 597                       (unsigned int)(acpi_dev->pnp.bus_address));
 598}
 599static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 600
 601static ssize_t
 602acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 603        struct acpi_device *acpi_dev = to_acpi_device(dev);
 604        struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 605        int result;
 606
 607        result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 608        if (result)
 609                goto end;
 610
 611        result = sprintf(buf, "%s\n", (char*)path.pointer);
 612        kfree(path.pointer);
 613end:
 614        return result;
 615}
 616static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 617
 618/* sysfs file that shows description text from the ACPI _STR method */
 619static ssize_t description_show(struct device *dev,
 620                                struct device_attribute *attr,
 621                                char *buf) {
 622        struct acpi_device *acpi_dev = to_acpi_device(dev);
 623        int result;
 624
 625        if (acpi_dev->pnp.str_obj == NULL)
 626                return 0;
 627
 628        /*
 629         * The _STR object contains a Unicode identifier for a device.
 630         * We need to convert to utf-8 so it can be displayed.
 631         */
 632        result = utf16s_to_utf8s(
 633                (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 634                acpi_dev->pnp.str_obj->buffer.length,
 635                UTF16_LITTLE_ENDIAN, buf,
 636                PAGE_SIZE);
 637
 638        buf[result++] = '\n';
 639
 640        return result;
 641}
 642static DEVICE_ATTR(description, 0444, description_show, NULL);
 643
 644static ssize_t
 645acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 646                     char *buf) {
 647        struct acpi_device *acpi_dev = to_acpi_device(dev);
 648
 649        return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 650}
 651static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 652
 653static int acpi_device_setup_files(struct acpi_device *dev)
 654{
 655        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 656        acpi_status status;
 657        acpi_handle temp;
 658        unsigned long long sun;
 659        int result = 0;
 660
 661        /*
 662         * Devices gotten from FADT don't have a "path" attribute
 663         */
 664        if (dev->handle) {
 665                result = device_create_file(&dev->dev, &dev_attr_path);
 666                if (result)
 667                        goto end;
 668        }
 669
 670        if (!list_empty(&dev->pnp.ids)) {
 671                result = device_create_file(&dev->dev, &dev_attr_hid);
 672                if (result)
 673                        goto end;
 674
 675                result = device_create_file(&dev->dev, &dev_attr_modalias);
 676                if (result)
 677                        goto end;
 678        }
 679
 680        /*
 681         * If device has _STR, 'description' file is created
 682         */
 683        status = acpi_get_handle(dev->handle, "_STR", &temp);
 684        if (ACPI_SUCCESS(status)) {
 685                status = acpi_evaluate_object(dev->handle, "_STR",
 686                                        NULL, &buffer);
 687                if (ACPI_FAILURE(status))
 688                        buffer.pointer = NULL;
 689                dev->pnp.str_obj = buffer.pointer;
 690                result = device_create_file(&dev->dev, &dev_attr_description);
 691                if (result)
 692                        goto end;
 693        }
 694
 695        if (dev->pnp.type.bus_address)
 696                result = device_create_file(&dev->dev, &dev_attr_adr);
 697        if (dev->pnp.unique_id)
 698                result = device_create_file(&dev->dev, &dev_attr_uid);
 699
 700        status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 701        if (ACPI_SUCCESS(status)) {
 702                dev->pnp.sun = (unsigned long)sun;
 703                result = device_create_file(&dev->dev, &dev_attr_sun);
 704                if (result)
 705                        goto end;
 706        } else {
 707                dev->pnp.sun = (unsigned long)-1;
 708        }
 709
 710        /*
 711         * If device has _EJ0, 'eject' file is created that is used to trigger
 712         * hot-removal function from userland.
 713         */
 714        status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 715        if (ACPI_SUCCESS(status)) {
 716                result = device_create_file(&dev->dev, &dev_attr_eject);
 717                if (result)
 718                        return result;
 719        }
 720
 721        if (dev->flags.power_manageable) {
 722                result = device_create_file(&dev->dev, &dev_attr_power_state);
 723                if (result)
 724                        return result;
 725
 726                if (dev->power.flags.power_resources)
 727                        result = device_create_file(&dev->dev,
 728                                                    &dev_attr_real_power_state);
 729        }
 730
 731end:
 732        return result;
 733}
 734
 735static void acpi_device_remove_files(struct acpi_device *dev)
 736{
 737        acpi_status status;
 738        acpi_handle temp;
 739
 740        if (dev->flags.power_manageable) {
 741                device_remove_file(&dev->dev, &dev_attr_power_state);
 742                if (dev->power.flags.power_resources)
 743                        device_remove_file(&dev->dev,
 744                                           &dev_attr_real_power_state);
 745        }
 746
 747        /*
 748         * If device has _STR, remove 'description' file
 749         */
 750        status = acpi_get_handle(dev->handle, "_STR", &temp);
 751        if (ACPI_SUCCESS(status)) {
 752                kfree(dev->pnp.str_obj);
 753                device_remove_file(&dev->dev, &dev_attr_description);
 754        }
 755        /*
 756         * If device has _EJ0, remove 'eject' file.
 757         */
 758        status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 759        if (ACPI_SUCCESS(status))
 760                device_remove_file(&dev->dev, &dev_attr_eject);
 761
 762        status = acpi_get_handle(dev->handle, "_SUN", &temp);
 763        if (ACPI_SUCCESS(status))
 764                device_remove_file(&dev->dev, &dev_attr_sun);
 765
 766        if (dev->pnp.unique_id)
 767                device_remove_file(&dev->dev, &dev_attr_uid);
 768        if (dev->pnp.type.bus_address)
 769                device_remove_file(&dev->dev, &dev_attr_adr);
 770        device_remove_file(&dev->dev, &dev_attr_modalias);
 771        device_remove_file(&dev->dev, &dev_attr_hid);
 772        if (dev->handle)
 773                device_remove_file(&dev->dev, &dev_attr_path);
 774}
 775/* --------------------------------------------------------------------------
 776                        ACPI Bus operations
 777   -------------------------------------------------------------------------- */
 778
 779static const struct acpi_device_id *__acpi_match_device(
 780        struct acpi_device *device, const struct acpi_device_id *ids)
 781{
 782        const struct acpi_device_id *id;
 783        struct acpi_hardware_id *hwid;
 784
 785        /*
 786         * If the device is not present, it is unnecessary to load device
 787         * driver for it.
 788         */
 789        if (!device->status.present)
 790                return NULL;
 791
 792        for (id = ids; id->id[0]; id++)
 793                list_for_each_entry(hwid, &device->pnp.ids, list)
 794                        if (!strcmp((char *) id->id, hwid->id))
 795                                return id;
 796
 797        return NULL;
 798}
 799
 800/**
 801 * acpi_match_device - Match a struct device against a given list of ACPI IDs
 802 * @ids: Array of struct acpi_device_id object to match against.
 803 * @dev: The device structure to match.
 804 *
 805 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 806 * object for that handle and use that object to match against a given list of
 807 * device IDs.
 808 *
 809 * Return a pointer to the first matching ID on success or %NULL on failure.
 810 */
 811const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 812                                               const struct device *dev)
 813{
 814        struct acpi_device *adev;
 815        acpi_handle handle = ACPI_HANDLE(dev);
 816
 817        if (!ids || !handle || acpi_bus_get_device(handle, &adev))
 818                return NULL;
 819
 820        return __acpi_match_device(adev, ids);
 821}
 822EXPORT_SYMBOL_GPL(acpi_match_device);
 823
 824int acpi_match_device_ids(struct acpi_device *device,
 825                          const struct acpi_device_id *ids)
 826{
 827        return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 828}
 829EXPORT_SYMBOL(acpi_match_device_ids);
 830
 831static void acpi_free_power_resources_lists(struct acpi_device *device)
 832{
 833        int i;
 834
 835        if (device->wakeup.flags.valid)
 836                acpi_power_resources_list_free(&device->wakeup.resources);
 837
 838        if (!device->flags.power_manageable)
 839                return;
 840
 841        for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 842                struct acpi_device_power_state *ps = &device->power.states[i];
 843                acpi_power_resources_list_free(&ps->resources);
 844        }
 845}
 846
 847static void acpi_device_release(struct device *dev)
 848{
 849        struct acpi_device *acpi_dev = to_acpi_device(dev);
 850
 851        acpi_free_pnp_ids(&acpi_dev->pnp);
 852        acpi_free_power_resources_lists(acpi_dev);
 853        kfree(acpi_dev);
 854}
 855
 856static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 857{
 858        struct acpi_device *acpi_dev = to_acpi_device(dev);
 859        struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 860
 861        return acpi_dev->flags.match_driver
 862                && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 863}
 864
 865static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 866{
 867        struct acpi_device *acpi_dev = to_acpi_device(dev);
 868        int len;
 869
 870        if (list_empty(&acpi_dev->pnp.ids))
 871                return 0;
 872
 873        if (add_uevent_var(env, "MODALIAS="))
 874                return -ENOMEM;
 875        len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 876                              sizeof(env->buf) - env->buflen);
 877        if (len >= (sizeof(env->buf) - env->buflen))
 878                return -ENOMEM;
 879        env->buflen += len;
 880        return 0;
 881}
 882
 883static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 884{
 885        struct acpi_device *device = data;
 886
 887        device->driver->ops.notify(device, event);
 888}
 889
 890static acpi_status acpi_device_notify_fixed(void *data)
 891{
 892        struct acpi_device *device = data;
 893
 894        /* Fixed hardware devices have no handles */
 895        acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 896        return AE_OK;
 897}
 898
 899static int acpi_device_install_notify_handler(struct acpi_device *device)
 900{
 901        acpi_status status;
 902
 903        if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 904                status =
 905                    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 906                                                     acpi_device_notify_fixed,
 907                                                     device);
 908        else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 909                status =
 910                    acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 911                                                     acpi_device_notify_fixed,
 912                                                     device);
 913        else
 914                status = acpi_install_notify_handler(device->handle,
 915                                                     ACPI_DEVICE_NOTIFY,
 916                                                     acpi_device_notify,
 917                                                     device);
 918
 919        if (ACPI_FAILURE(status))
 920                return -EINVAL;
 921        return 0;
 922}
 923
 924static void acpi_device_remove_notify_handler(struct acpi_device *device)
 925{
 926        if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 927                acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 928                                                acpi_device_notify_fixed);
 929        else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 930                acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 931                                                acpi_device_notify_fixed);
 932        else
 933                acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 934                                           acpi_device_notify);
 935}
 936
 937static int acpi_device_probe(struct device *dev)
 938{
 939        struct acpi_device *acpi_dev = to_acpi_device(dev);
 940        struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 941        int ret;
 942
 943        if (acpi_dev->handler)
 944                return -EINVAL;
 945
 946        if (!acpi_drv->ops.add)
 947                return -ENOSYS;
 948
 949        ret = acpi_drv->ops.add(acpi_dev);
 950        if (ret)
 951                return ret;
 952
 953        acpi_dev->driver = acpi_drv;
 954        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 955                          "Driver [%s] successfully bound to device [%s]\n",
 956                          acpi_drv->name, acpi_dev->pnp.bus_id));
 957
 958        if (acpi_drv->ops.notify) {
 959                ret = acpi_device_install_notify_handler(acpi_dev);
 960                if (ret) {
 961                        if (acpi_drv->ops.remove)
 962                                acpi_drv->ops.remove(acpi_dev);
 963
 964                        acpi_dev->driver = NULL;
 965                        acpi_dev->driver_data = NULL;
 966                        return ret;
 967                }
 968        }
 969
 970        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
 971                          acpi_drv->name, acpi_dev->pnp.bus_id));
 972        get_device(dev);
 973        return 0;
 974}
 975
 976static int acpi_device_remove(struct device * dev)
 977{
 978        struct acpi_device *acpi_dev = to_acpi_device(dev);
 979        struct acpi_driver *acpi_drv = acpi_dev->driver;
 980
 981        if (acpi_drv) {
 982                if (acpi_drv->ops.notify)
 983                        acpi_device_remove_notify_handler(acpi_dev);
 984                if (acpi_drv->ops.remove)
 985                        acpi_drv->ops.remove(acpi_dev);
 986        }
 987        acpi_dev->driver = NULL;
 988        acpi_dev->driver_data = NULL;
 989
 990        put_device(dev);
 991        return 0;
 992}
 993
 994struct bus_type acpi_bus_type = {
 995        .name           = "acpi",
 996        .match          = acpi_bus_match,
 997        .probe          = acpi_device_probe,
 998        .remove         = acpi_device_remove,
 999        .uevent         = acpi_device_uevent,
1000};
1001
1002int acpi_device_add(struct acpi_device *device,
1003                    void (*release)(struct device *))
1004{
1005        int result;
1006        struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1007        int found = 0;
1008
1009        if (device->handle) {
1010                acpi_status status;
1011
1012                status = acpi_attach_data(device->handle, acpi_bus_data_handler,
1013                                          device);
1014                if (ACPI_FAILURE(status)) {
1015                        acpi_handle_err(device->handle,
1016                                        "Unable to attach device data\n");
1017                        return -ENODEV;
1018                }
1019        }
1020
1021        /*
1022         * Linkage
1023         * -------
1024         * Link this device to its parent and siblings.
1025         */
1026        INIT_LIST_HEAD(&device->children);
1027        INIT_LIST_HEAD(&device->node);
1028        INIT_LIST_HEAD(&device->wakeup_list);
1029        INIT_LIST_HEAD(&device->physical_node_list);
1030        mutex_init(&device->physical_node_lock);
1031        INIT_LIST_HEAD(&device->power_dependent);
1032
1033        new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1034        if (!new_bus_id) {
1035                pr_err(PREFIX "Memory allocation error\n");
1036                result = -ENOMEM;
1037                goto err_detach;
1038        }
1039
1040        mutex_lock(&acpi_device_lock);
1041        /*
1042         * Find suitable bus_id and instance number in acpi_bus_id_list
1043         * If failed, create one and link it into acpi_bus_id_list
1044         */
1045        list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1046                if (!strcmp(acpi_device_bus_id->bus_id,
1047                            acpi_device_hid(device))) {
1048                        acpi_device_bus_id->instance_no++;
1049                        found = 1;
1050                        kfree(new_bus_id);
1051                        break;
1052                }
1053        }
1054        if (!found) {
1055                acpi_device_bus_id = new_bus_id;
1056                strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1057                acpi_device_bus_id->instance_no = 0;
1058                list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1059        }
1060        dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1061
1062        if (device->parent)
1063                list_add_tail(&device->node, &device->parent->children);
1064
1065        if (device->wakeup.flags.valid)
1066                list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1067        mutex_unlock(&acpi_device_lock);
1068
1069        if (device->parent)
1070                device->dev.parent = &device->parent->dev;
1071        device->dev.bus = &acpi_bus_type;
1072        device->dev.release = release;
1073        result = device_add(&device->dev);
1074        if (result) {
1075                dev_err(&device->dev, "Error registering device\n");
1076                goto err;
1077        }
1078
1079        result = acpi_device_setup_files(device);
1080        if (result)
1081                printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1082                       dev_name(&device->dev));
1083
1084        return 0;
1085
1086 err:
1087        mutex_lock(&acpi_device_lock);
1088        if (device->parent)
1089                list_del(&device->node);
1090        list_del(&device->wakeup_list);
1091        mutex_unlock(&acpi_device_lock);
1092
1093 err_detach:
1094        acpi_detach_data(device->handle, acpi_bus_data_handler);
1095        return result;
1096}
1097
1098static void acpi_device_unregister(struct acpi_device *device)
1099{
1100        mutex_lock(&acpi_device_lock);
1101        if (device->parent)
1102                list_del(&device->node);
1103
1104        list_del(&device->wakeup_list);
1105        mutex_unlock(&acpi_device_lock);
1106
1107        acpi_detach_data(device->handle, acpi_bus_data_handler);
1108
1109        acpi_power_add_remove_device(device, false);
1110        acpi_device_remove_files(device);
1111        if (device->remove)
1112                device->remove(device);
1113
1114        device_del(&device->dev);
1115        /*
1116         * Transition the device to D3cold to drop the reference counts of all
1117         * power resources the device depends on and turn off the ones that have
1118         * no more references.
1119         */
1120        acpi_device_set_power(device, ACPI_STATE_D3_COLD);
1121        device->handle = NULL;
1122        put_device(&device->dev);
1123}
1124
1125/* --------------------------------------------------------------------------
1126                                 Driver Management
1127   -------------------------------------------------------------------------- */
1128/**
1129 * acpi_bus_register_driver - register a driver with the ACPI bus
1130 * @driver: driver being registered
1131 *
1132 * Registers a driver with the ACPI bus.  Searches the namespace for all
1133 * devices that match the driver's criteria and binds.  Returns zero for
1134 * success or a negative error status for failure.
1135 */
1136int acpi_bus_register_driver(struct acpi_driver *driver)
1137{
1138        int ret;
1139
1140        if (acpi_disabled)
1141                return -ENODEV;
1142        driver->drv.name = driver->name;
1143        driver->drv.bus = &acpi_bus_type;
1144        driver->drv.owner = driver->owner;
1145
1146        ret = driver_register(&driver->drv);
1147        return ret;
1148}
1149
1150EXPORT_SYMBOL(acpi_bus_register_driver);
1151
1152/**
1153 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1154 * @driver: driver to unregister
1155 *
1156 * Unregisters a driver with the ACPI bus.  Searches the namespace for all
1157 * devices that match the driver's criteria and unbinds.
1158 */
1159void acpi_bus_unregister_driver(struct acpi_driver *driver)
1160{
1161        driver_unregister(&driver->drv);
1162}
1163
1164EXPORT_SYMBOL(acpi_bus_unregister_driver);
1165
1166/* --------------------------------------------------------------------------
1167                                 Device Enumeration
1168   -------------------------------------------------------------------------- */
1169static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1170{
1171        struct acpi_device *device = NULL;
1172        acpi_status status;
1173
1174        /*
1175         * Fixed hardware devices do not appear in the namespace and do not
1176         * have handles, but we fabricate acpi_devices for them, so we have
1177         * to deal with them specially.
1178         */
1179        if (!handle)
1180                return acpi_root;
1181
1182        do {
1183                status = acpi_get_parent(handle, &handle);
1184                if (ACPI_FAILURE(status))
1185                        return status == AE_NULL_ENTRY ? NULL : acpi_root;
1186        } while (acpi_bus_get_device(handle, &device));
1187        return device;
1188}
1189
1190acpi_status
1191acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1192{
1193        acpi_status status;
1194        acpi_handle tmp;
1195        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1196        union acpi_object *obj;
1197
1198        status = acpi_get_handle(handle, "_EJD", &tmp);
1199        if (ACPI_FAILURE(status))
1200                return status;
1201
1202        status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1203        if (ACPI_SUCCESS(status)) {
1204                obj = buffer.pointer;
1205                status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1206                                         ejd);
1207                kfree(buffer.pointer);
1208        }
1209        return status;
1210}
1211EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1212
1213void acpi_bus_data_handler(acpi_handle handle, void *context)
1214{
1215
1216        /* TBD */
1217
1218        return;
1219}
1220
1221static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1222                                        struct acpi_device_wakeup *wakeup)
1223{
1224        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1225        union acpi_object *package = NULL;
1226        union acpi_object *element = NULL;
1227        acpi_status status;
1228        int err = -ENODATA;
1229
1230        if (!wakeup)
1231                return -EINVAL;
1232
1233        INIT_LIST_HEAD(&wakeup->resources);
1234
1235        /* _PRW */
1236        status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1237        if (ACPI_FAILURE(status)) {
1238                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1239                return err;
1240        }
1241
1242        package = (union acpi_object *)buffer.pointer;
1243
1244        if (!package || package->package.count < 2)
1245                goto out;
1246
1247        element = &(package->package.elements[0]);
1248        if (!element)
1249                goto out;
1250
1251        if (element->type == ACPI_TYPE_PACKAGE) {
1252                if ((element->package.count < 2) ||
1253                    (element->package.elements[0].type !=
1254                     ACPI_TYPE_LOCAL_REFERENCE)
1255                    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1256                        goto out;
1257
1258                wakeup->gpe_device =
1259                    element->package.elements[0].reference.handle;
1260                wakeup->gpe_number =
1261                    (u32) element->package.elements[1].integer.value;
1262        } else if (element->type == ACPI_TYPE_INTEGER) {
1263                wakeup->gpe_device = NULL;
1264                wakeup->gpe_number = element->integer.value;
1265        } else {
1266                goto out;
1267        }
1268
1269        element = &(package->package.elements[1]);
1270        if (element->type != ACPI_TYPE_INTEGER)
1271                goto out;
1272
1273        wakeup->sleep_state = element->integer.value;
1274
1275        err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1276        if (err)
1277                goto out;
1278
1279        if (!list_empty(&wakeup->resources)) {
1280                int sleep_state;
1281
1282                err = acpi_power_wakeup_list_init(&wakeup->resources,
1283                                                  &sleep_state);
1284                if (err) {
1285                        acpi_handle_warn(handle, "Retrieving current states "
1286                                         "of wakeup power resources failed\n");
1287                        acpi_power_resources_list_free(&wakeup->resources);
1288                        goto out;
1289                }
1290                if (sleep_state < wakeup->sleep_state) {
1291                        acpi_handle_warn(handle, "Overriding _PRW sleep state "
1292                                         "(S%d) by S%d from power resources\n",
1293                                         (int)wakeup->sleep_state, sleep_state);
1294                        wakeup->sleep_state = sleep_state;
1295                }
1296        }
1297        acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1298
1299 out:
1300        kfree(buffer.pointer);
1301        return err;
1302}
1303
1304static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1305{
1306        struct acpi_device_id button_device_ids[] = {
1307                {"PNP0C0C", 0},
1308                {"PNP0C0D", 0},
1309                {"PNP0C0E", 0},
1310                {"", 0},
1311        };
1312        acpi_status status;
1313        acpi_event_status event_status;
1314
1315        device->wakeup.flags.notifier_present = 0;
1316
1317        /* Power button, Lid switch always enable wakeup */
1318        if (!acpi_match_device_ids(device, button_device_ids)) {
1319                device->wakeup.flags.run_wake = 1;
1320                if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1321                        /* Do not use Lid/sleep button for S5 wakeup */
1322                        if (device->wakeup.sleep_state == ACPI_STATE_S5)
1323                                device->wakeup.sleep_state = ACPI_STATE_S4;
1324                }
1325                device_set_wakeup_capable(&device->dev, true);
1326                return;
1327        }
1328
1329        status = acpi_get_gpe_status(device->wakeup.gpe_device,
1330                                        device->wakeup.gpe_number,
1331                                                &event_status);
1332        if (status == AE_OK)
1333                device->wakeup.flags.run_wake =
1334                                !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1335}
1336
1337static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1338{
1339        acpi_handle temp;
1340        acpi_status status = 0;
1341        int err;
1342
1343        /* Presence of _PRW indicates wake capable */
1344        status = acpi_get_handle(device->handle, "_PRW", &temp);
1345        if (ACPI_FAILURE(status))
1346                return;
1347
1348        err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1349                                                           &device->wakeup);
1350        if (err) {
1351                dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1352                return;
1353        }
1354
1355        device->wakeup.flags.valid = 1;
1356        device->wakeup.prepare_count = 0;
1357        acpi_bus_set_run_wake_flags(device);
1358        /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1359         * system for the ACPI device with the _PRW object.
1360         * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1361         * So it is necessary to call _DSW object first. Only when it is not
1362         * present will the _PSW object used.
1363         */
1364        err = acpi_device_sleep_wake(device, 0, 0, 0);
1365        if (err)
1366                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1367                                "error in _DSW or _PSW evaluation\n"));
1368}
1369
1370static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1371{
1372        struct acpi_device_power_state *ps = &device->power.states[state];
1373        char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1374        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1375        acpi_handle handle;
1376        acpi_status status;
1377
1378        INIT_LIST_HEAD(&ps->resources);
1379
1380        /* Evaluate "_PRx" to get referenced power resources */
1381        status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1382        if (ACPI_SUCCESS(status)) {
1383                union acpi_object *package = buffer.pointer;
1384
1385                if (buffer.length && package
1386                    && package->type == ACPI_TYPE_PACKAGE
1387                    && package->package.count) {
1388                        int err = acpi_extract_power_resources(package, 0,
1389                                                               &ps->resources);
1390                        if (!err)
1391                                device->power.flags.power_resources = 1;
1392                }
1393                ACPI_FREE(buffer.pointer);
1394        }
1395
1396        /* Evaluate "_PSx" to see if we can do explicit sets */
1397        pathname[2] = 'S';
1398        status = acpi_get_handle(device->handle, pathname, &handle);
1399        if (ACPI_SUCCESS(status))
1400                ps->flags.explicit_set = 1;
1401
1402        /*
1403         * State is valid if there are means to put the device into it.
1404         * D3hot is only valid if _PR3 present.
1405         */
1406        if (!list_empty(&ps->resources)
1407            || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1408                ps->flags.valid = 1;
1409                ps->flags.os_accessible = 1;
1410        }
1411
1412        ps->power = -1;         /* Unknown - driver assigned */
1413        ps->latency = -1;       /* Unknown - driver assigned */
1414}
1415
1416static void acpi_bus_get_power_flags(struct acpi_device *device)
1417{
1418        acpi_status status;
1419        acpi_handle handle;
1420        u32 i;
1421
1422        /* Presence of _PS0|_PR0 indicates 'power manageable' */
1423        status = acpi_get_handle(device->handle, "_PS0", &handle);
1424        if (ACPI_FAILURE(status)) {
1425                status = acpi_get_handle(device->handle, "_PR0", &handle);
1426                if (ACPI_FAILURE(status))
1427                        return;
1428        }
1429
1430        device->flags.power_manageable = 1;
1431
1432        /*
1433         * Power Management Flags
1434         */
1435        status = acpi_get_handle(device->handle, "_PSC", &handle);
1436        if (ACPI_SUCCESS(status))
1437                device->power.flags.explicit_get = 1;
1438        status = acpi_get_handle(device->handle, "_IRC", &handle);
1439        if (ACPI_SUCCESS(status))
1440                device->power.flags.inrush_current = 1;
1441
1442        /*
1443         * Enumerate supported power management states
1444         */
1445        for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1446                acpi_bus_init_power_state(device, i);
1447
1448        INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1449
1450        /* Set defaults for D0 and D3 states (always valid) */
1451        device->power.states[ACPI_STATE_D0].flags.valid = 1;
1452        device->power.states[ACPI_STATE_D0].power = 100;
1453        device->power.states[ACPI_STATE_D3].flags.valid = 1;
1454        device->power.states[ACPI_STATE_D3].power = 0;
1455
1456        /* Set D3cold's explicit_set flag if _PS3 exists. */
1457        if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1458                device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1459
1460        /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1461        if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1462                        device->power.flags.power_resources)
1463                device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1464
1465        if (acpi_bus_init_power(device)) {
1466                acpi_free_power_resources_lists(device);
1467                device->flags.power_manageable = 0;
1468        }
1469}
1470
1471static void acpi_bus_get_flags(struct acpi_device *device)
1472{
1473        acpi_status status = AE_OK;
1474        acpi_handle temp = NULL;
1475
1476        /* Presence of _STA indicates 'dynamic_status' */
1477        status = acpi_get_handle(device->handle, "_STA", &temp);
1478        if (ACPI_SUCCESS(status))
1479                device->flags.dynamic_status = 1;
1480
1481        /* Presence of _RMV indicates 'removable' */
1482        status = acpi_get_handle(device->handle, "_RMV", &temp);
1483        if (ACPI_SUCCESS(status))
1484                device->flags.removable = 1;
1485
1486        /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1487        status = acpi_get_handle(device->handle, "_EJD", &temp);
1488        if (ACPI_SUCCESS(status))
1489                device->flags.ejectable = 1;
1490        else {
1491                status = acpi_get_handle(device->handle, "_EJ0", &temp);
1492                if (ACPI_SUCCESS(status))
1493                        device->flags.ejectable = 1;
1494        }
1495}
1496
1497static void acpi_device_get_busid(struct acpi_device *device)
1498{
1499        char bus_id[5] = { '?', 0 };
1500        struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1501        int i = 0;
1502
1503        /*
1504         * Bus ID
1505         * ------
1506         * The device's Bus ID is simply the object name.
1507         * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1508         */
1509        if (ACPI_IS_ROOT_DEVICE(device)) {
1510                strcpy(device->pnp.bus_id, "ACPI");
1511                return;
1512        }
1513
1514        switch (device->device_type) {
1515        case ACPI_BUS_TYPE_POWER_BUTTON:
1516                strcpy(device->pnp.bus_id, "PWRF");
1517                break;
1518        case ACPI_BUS_TYPE_SLEEP_BUTTON:
1519                strcpy(device->pnp.bus_id, "SLPF");
1520                break;
1521        default:
1522                acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1523                /* Clean up trailing underscores (if any) */
1524                for (i = 3; i > 1; i--) {
1525                        if (bus_id[i] == '_')
1526                                bus_id[i] = '\0';
1527                        else
1528                                break;
1529                }
1530                strcpy(device->pnp.bus_id, bus_id);
1531                break;
1532        }
1533}
1534
1535/*
1536 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1537 *
1538 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1539 * then we can safely call it an ejectable drive bay
1540 */
1541static int acpi_bay_match(acpi_handle handle)
1542{
1543        acpi_status status;
1544        acpi_handle tmp;
1545        acpi_handle phandle;
1546
1547        status = acpi_get_handle(handle, "_EJ0", &tmp);
1548        if (ACPI_FAILURE(status))
1549                return -ENODEV;
1550
1551        if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1552                (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1553                (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1554                (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1555                return 0;
1556
1557        if (acpi_get_parent(handle, &phandle))
1558                return -ENODEV;
1559
1560        if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1561                (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1562                (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1563                (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1564                return 0;
1565
1566        return -ENODEV;
1567}
1568
1569/*
1570 * acpi_dock_match - see if an acpi object has a _DCK method
1571 */
1572static int acpi_dock_match(acpi_handle handle)
1573{
1574        acpi_handle tmp;
1575        return acpi_get_handle(handle, "_DCK", &tmp);
1576}
1577
1578const char *acpi_device_hid(struct acpi_device *device)
1579{
1580        struct acpi_hardware_id *hid;
1581
1582        if (list_empty(&device->pnp.ids))
1583                return dummy_hid;
1584
1585        hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1586        return hid->id;
1587}
1588EXPORT_SYMBOL(acpi_device_hid);
1589
1590static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1591{
1592        struct acpi_hardware_id *id;
1593
1594        id = kmalloc(sizeof(*id), GFP_KERNEL);
1595        if (!id)
1596                return;
1597
1598        id->id = kstrdup(dev_id, GFP_KERNEL);
1599        if (!id->id) {
1600                kfree(id);
1601                return;
1602        }
1603
1604        list_add_tail(&id->list, &pnp->ids);
1605        pnp->type.hardware_id = 1;
1606}
1607
1608/*
1609 * Old IBM workstations have a DSDT bug wherein the SMBus object
1610 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1611 * prefix.  Work around this.
1612 */
1613static int acpi_ibm_smbus_match(acpi_handle handle)
1614{
1615        acpi_handle h_dummy;
1616        struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1617        int result;
1618
1619        if (!dmi_name_in_vendors("IBM"))
1620                return -ENODEV;
1621
1622        /* Look for SMBS object */
1623        result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
1624        if (result)
1625                return result;
1626
1627        if (strcmp("SMBS", path.pointer)) {
1628                result = -ENODEV;
1629                goto out;
1630        }
1631
1632        /* Does it have the necessary (but misnamed) methods? */
1633        result = -ENODEV;
1634        if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
1635            ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
1636            ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
1637                result = 0;
1638out:
1639        kfree(path.pointer);
1640        return result;
1641}
1642
1643static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1644                                int device_type)
1645{
1646        acpi_status status;
1647        struct acpi_device_info *info;
1648        struct acpi_pnp_device_id_list *cid_list;
1649        int i;
1650
1651        switch (device_type) {
1652        case ACPI_BUS_TYPE_DEVICE:
1653                if (handle == ACPI_ROOT_OBJECT) {
1654                        acpi_add_id(pnp, ACPI_SYSTEM_HID);
1655                        break;
1656                }
1657
1658                status = acpi_get_object_info(handle, &info);
1659                if (ACPI_FAILURE(status)) {
1660                        pr_err(PREFIX "%s: Error reading device info\n",
1661                                        __func__);
1662                        return;
1663                }
1664
1665                if (info->valid & ACPI_VALID_HID)
1666                        acpi_add_id(pnp, info->hardware_id.string);
1667                if (info->valid & ACPI_VALID_CID) {
1668                        cid_list = &info->compatible_id_list;
1669                        for (i = 0; i < cid_list->count; i++)
1670                                acpi_add_id(pnp, cid_list->ids[i].string);
1671                }
1672                if (info->valid & ACPI_VALID_ADR) {
1673                        pnp->bus_address = info->address;
1674                        pnp->type.bus_address = 1;
1675                }
1676                if (info->valid & ACPI_VALID_UID)
1677                        pnp->unique_id = kstrdup(info->unique_id.string,
1678                                                        GFP_KERNEL);
1679
1680                kfree(info);
1681
1682                /*
1683                 * Some devices don't reliably have _HIDs & _CIDs, so add
1684                 * synthetic HIDs to make sure drivers can find them.
1685                 */
1686                if (acpi_is_video_device(handle))
1687                        acpi_add_id(pnp, ACPI_VIDEO_HID);
1688                else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1689                        acpi_add_id(pnp, ACPI_BAY_HID);
1690                else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1691                        acpi_add_id(pnp, ACPI_DOCK_HID);
1692                else if (!acpi_ibm_smbus_match(handle))
1693                        acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1694                else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1695                        acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1696                        strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1697                        strcpy(pnp->device_class, ACPI_BUS_CLASS);
1698                }
1699
1700                break;
1701        case ACPI_BUS_TYPE_POWER:
1702                acpi_add_id(pnp, ACPI_POWER_HID);
1703                break;
1704        case ACPI_BUS_TYPE_PROCESSOR:
1705                acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1706                break;
1707        case ACPI_BUS_TYPE_THERMAL:
1708                acpi_add_id(pnp, ACPI_THERMAL_HID);
1709                break;
1710        case ACPI_BUS_TYPE_POWER_BUTTON:
1711                acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1712                break;
1713        case ACPI_BUS_TYPE_SLEEP_BUTTON:
1714                acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1715                break;
1716        }
1717}
1718
1719void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1720{
1721        struct acpi_hardware_id *id, *tmp;
1722
1723        list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1724                kfree(id->id);
1725                kfree(id);
1726        }
1727        kfree(pnp->unique_id);
1728}
1729
1730void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1731                             int type, unsigned long long sta)
1732{
1733        INIT_LIST_HEAD(&device->pnp.ids);
1734        device->device_type = type;
1735        device->handle = handle;
1736        device->parent = acpi_bus_get_parent(handle);
1737        STRUCT_TO_INT(device->status) = sta;
1738        acpi_device_get_busid(device);
1739        acpi_set_pnp_ids(handle, &device->pnp, type);
1740        acpi_bus_get_flags(device);
1741        device->flags.match_driver = false;
1742        device_initialize(&device->dev);
1743        dev_set_uevent_suppress(&device->dev, true);
1744}
1745
1746void acpi_device_add_finalize(struct acpi_device *device)
1747{
1748        device->flags.match_driver = true;
1749        dev_set_uevent_suppress(&device->dev, false);
1750        kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1751}
1752
1753static int acpi_add_single_object(struct acpi_device **child,
1754                                  acpi_handle handle, int type,
1755                                  unsigned long long sta)
1756{
1757        int result;
1758        struct acpi_device *device;
1759        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1760
1761        device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1762        if (!device) {
1763                printk(KERN_ERR PREFIX "Memory allocation error\n");
1764                return -ENOMEM;
1765        }
1766
1767        acpi_init_device_object(device, handle, type, sta);
1768        acpi_bus_get_power_flags(device);
1769        acpi_bus_get_wakeup_device_flags(device);
1770
1771        result = acpi_device_add(device, acpi_device_release);
1772        if (result) {
1773                acpi_device_release(&device->dev);
1774                return result;
1775        }
1776
1777        acpi_power_add_remove_device(device, true);
1778        acpi_device_add_finalize(device);
1779        acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1780        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1781                dev_name(&device->dev), (char *) buffer.pointer,
1782                device->parent ? dev_name(&device->parent->dev) : "(null)"));
1783        kfree(buffer.pointer);
1784        *child = device;
1785        return 0;
1786}
1787
1788static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1789                                    unsigned long long *sta)
1790{
1791        acpi_status status;
1792        acpi_object_type acpi_type;
1793
1794        status = acpi_get_type(handle, &acpi_type);
1795        if (ACPI_FAILURE(status))
1796                return -ENODEV;
1797
1798        switch (acpi_type) {
1799        case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1800        case ACPI_TYPE_DEVICE:
1801                *type = ACPI_BUS_TYPE_DEVICE;
1802                status = acpi_bus_get_status_handle(handle, sta);
1803                if (ACPI_FAILURE(status))
1804                        return -ENODEV;
1805                break;
1806        case ACPI_TYPE_PROCESSOR:
1807                *type = ACPI_BUS_TYPE_PROCESSOR;
1808                status = acpi_bus_get_status_handle(handle, sta);
1809                if (ACPI_FAILURE(status))
1810                        return -ENODEV;
1811                break;
1812        case ACPI_TYPE_THERMAL:
1813                *type = ACPI_BUS_TYPE_THERMAL;
1814                *sta = ACPI_STA_DEFAULT;
1815                break;
1816        case ACPI_TYPE_POWER:
1817                *type = ACPI_BUS_TYPE_POWER;
1818                *sta = ACPI_STA_DEFAULT;
1819                break;
1820        default:
1821                return -ENODEV;
1822        }
1823
1824        return 0;
1825}
1826
1827static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1828                                       char *idstr,
1829                                       const struct acpi_device_id **matchid)
1830{
1831        const struct acpi_device_id *devid;
1832
1833        for (devid = handler->ids; devid->id[0]; devid++)
1834                if (!strcmp((char *)devid->id, idstr)) {
1835                        if (matchid)
1836                                *matchid = devid;
1837
1838                        return true;
1839                }
1840
1841        return false;
1842}
1843
1844static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1845                                        const struct acpi_device_id **matchid)
1846{
1847        struct acpi_scan_handler *handler;
1848
1849        list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1850                if (acpi_scan_handler_matching(handler, idstr, matchid))
1851                        return handler;
1852
1853        return NULL;
1854}
1855
1856void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1857{
1858        if (!!hotplug->enabled == !!val)
1859                return;
1860
1861        mutex_lock(&acpi_scan_lock);
1862
1863        hotplug->enabled = val;
1864
1865        mutex_unlock(&acpi_scan_lock);
1866}
1867
1868static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1869{
1870        struct acpi_device_pnp pnp = {};
1871        struct acpi_hardware_id *hwid;
1872        struct acpi_scan_handler *handler;
1873
1874        INIT_LIST_HEAD(&pnp.ids);
1875        acpi_set_pnp_ids(handle, &pnp, type);
1876
1877        if (!pnp.type.hardware_id)
1878                goto out;
1879
1880        /*
1881         * This relies on the fact that acpi_install_notify_handler() will not
1882         * install the same notify handler routine twice for the same handle.
1883         */
1884        list_for_each_entry(hwid, &pnp.ids, list) {
1885                handler = acpi_scan_match_handler(hwid->id, NULL);
1886                if (handler) {
1887                        acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1888                                        acpi_hotplug_notify_cb, handler);
1889                        break;
1890                }
1891        }
1892
1893out:
1894        acpi_free_pnp_ids(&pnp);
1895}
1896
1897static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1898                                      void *not_used, void **return_value)
1899{
1900        struct acpi_device *device = NULL;
1901        int type;
1902        unsigned long long sta;
1903        acpi_status status;
1904        int result;
1905
1906        acpi_bus_get_device(handle, &device);
1907        if (device)
1908                goto out;
1909
1910        result = acpi_bus_type_and_status(handle, &type, &sta);
1911        if (result)
1912                return AE_OK;
1913
1914        if (type == ACPI_BUS_TYPE_POWER) {
1915                acpi_add_power_resource(handle);
1916                return AE_OK;
1917        }
1918
1919        acpi_scan_init_hotplug(handle, type);
1920
1921        if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1922            !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1923                struct acpi_device_wakeup wakeup;
1924                acpi_handle temp;
1925
1926                status = acpi_get_handle(handle, "_PRW", &temp);
1927                if (ACPI_SUCCESS(status)) {
1928                        acpi_bus_extract_wakeup_device_power_package(handle,
1929                                                                     &wakeup);
1930                        acpi_power_resources_list_free(&wakeup.resources);
1931                }
1932                return AE_CTRL_DEPTH;
1933        }
1934
1935        acpi_add_single_object(&device, handle, type, sta);
1936        if (!device)
1937                return AE_CTRL_DEPTH;
1938
1939 out:
1940        if (!*return_value)
1941                *return_value = device;
1942
1943        return AE_OK;
1944}
1945
1946static int acpi_scan_attach_handler(struct acpi_device *device)
1947{
1948        struct acpi_hardware_id *hwid;
1949        int ret = 0;
1950
1951        list_for_each_entry(hwid, &device->pnp.ids, list) {
1952                const struct acpi_device_id *devid;
1953                struct acpi_scan_handler *handler;
1954
1955                handler = acpi_scan_match_handler(hwid->id, &devid);
1956                if (handler) {
1957                        ret = handler->attach(device, devid);
1958                        if (ret > 0) {
1959                                device->handler = handler;
1960                                break;
1961                        } else if (ret < 0) {
1962                                break;
1963                        }
1964                }
1965        }
1966        return ret;
1967}
1968
1969static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1970                                          void *not_used, void **ret_not_used)
1971{
1972        struct acpi_device *device;
1973        unsigned long long sta_not_used;
1974        int ret;
1975
1976        /*
1977         * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1978         * namespace walks prematurely.
1979         */
1980        if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1981                return AE_OK;
1982
1983        if (acpi_bus_get_device(handle, &device))
1984                return AE_CTRL_DEPTH;
1985
1986        if (device->handler)
1987                return AE_OK;
1988
1989        ret = acpi_scan_attach_handler(device);
1990        if (ret)
1991                return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1992
1993        ret = device_attach(&device->dev);
1994        return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1995}
1996
1997/**
1998 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1999 * @handle: Root of the namespace scope to scan.
2000 *
2001 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2002 * found devices.
2003 *
2004 * If no devices were found, -ENODEV is returned, but it does not mean that
2005 * there has been a real error.  There just have been no suitable ACPI objects
2006 * in the table trunk from which the kernel could create a device and add an
2007 * appropriate driver.
2008 *
2009 * Must be called under acpi_scan_lock.
2010 */
2011int acpi_bus_scan(acpi_handle handle)
2012{
2013        void *device = NULL;
2014        int error = 0;
2015
2016        if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2017                acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2018                                    acpi_bus_check_add, NULL, NULL, &device);
2019
2020        if (!device)
2021                error = -ENODEV;
2022        else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
2023                acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2024                                    acpi_bus_device_attach, NULL, NULL, NULL);
2025
2026        return error;
2027}
2028EXPORT_SYMBOL(acpi_bus_scan);
2029
2030static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
2031                                          void *not_used, void **ret_not_used)
2032{
2033        struct acpi_device *device = NULL;
2034
2035        if (!acpi_bus_get_device(handle, &device)) {
2036                struct acpi_scan_handler *dev_handler = device->handler;
2037
2038                if (dev_handler) {
2039                        if (dev_handler->detach)
2040                                dev_handler->detach(device);
2041
2042                        device->handler = NULL;
2043                } else {
2044                        device_release_driver(&device->dev);
2045                }
2046        }
2047        return AE_OK;
2048}
2049
2050static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
2051                                   void *not_used, void **ret_not_used)
2052{
2053        struct acpi_device *device = NULL;
2054
2055        if (!acpi_bus_get_device(handle, &device))
2056                acpi_device_unregister(device);
2057
2058        return AE_OK;
2059}
2060
2061/**
2062 * acpi_bus_trim - Remove ACPI device node and all of its descendants
2063 * @start: Root of the ACPI device nodes subtree to remove.
2064 *
2065 * Must be called under acpi_scan_lock.
2066 */
2067void acpi_bus_trim(struct acpi_device *start)
2068{
2069        /*
2070         * Execute acpi_bus_device_detach() as a post-order callback to detach
2071         * all ACPI drivers from the device nodes being removed.
2072         */
2073        acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2074                            acpi_bus_device_detach, NULL, NULL);
2075        acpi_bus_device_detach(start->handle, 0, NULL, NULL);
2076        /*
2077         * Execute acpi_bus_remove() as a post-order callback to remove device
2078         * nodes in the given namespace scope.
2079         */
2080        acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2081                            acpi_bus_remove, NULL, NULL);
2082        acpi_bus_remove(start->handle, 0, NULL, NULL);
2083}
2084EXPORT_SYMBOL_GPL(acpi_bus_trim);
2085
2086static int acpi_bus_scan_fixed(void)
2087{
2088        int result = 0;
2089
2090        /*
2091         * Enumerate all fixed-feature devices.
2092         */
2093        if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2094                struct acpi_device *device = NULL;
2095
2096                result = acpi_add_single_object(&device, NULL,
2097                                                ACPI_BUS_TYPE_POWER_BUTTON,
2098                                                ACPI_STA_DEFAULT);
2099                if (result)
2100                        return result;
2101
2102                result = device_attach(&device->dev);
2103                if (result < 0)
2104                        return result;
2105
2106                device_init_wakeup(&device->dev, true);
2107        }
2108
2109        if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2110                struct acpi_device *device = NULL;
2111
2112                result = acpi_add_single_object(&device, NULL,
2113                                                ACPI_BUS_TYPE_SLEEP_BUTTON,
2114                                                ACPI_STA_DEFAULT);
2115                if (result)
2116                        return result;
2117
2118                result = device_attach(&device->dev);
2119        }
2120
2121        return result < 0 ? result : 0;
2122}
2123
2124int __init acpi_scan_init(void)
2125{
2126        int result;
2127
2128        result = bus_register(&acpi_bus_type);
2129        if (result) {
2130                /* We don't want to quit even if we failed to add suspend/resume */
2131                printk(KERN_ERR PREFIX "Could not register bus type\n");
2132        }
2133
2134        acpi_pci_root_init();
2135        acpi_pci_link_init();
2136        acpi_processor_init();
2137        acpi_platform_init();
2138        acpi_lpss_init();
2139        acpi_cmos_rtc_init();
2140        acpi_container_init();
2141        acpi_memory_hotplug_init();
2142        acpi_dock_init();
2143
2144        mutex_lock(&acpi_scan_lock);
2145        /*
2146         * Enumerate devices in the ACPI namespace.
2147         */
2148        result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2149        if (result)
2150                goto out;
2151
2152        result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2153        if (result)
2154                goto out;
2155
2156        result = acpi_bus_scan_fixed();
2157        if (result) {
2158                acpi_device_unregister(acpi_root);
2159                goto out;
2160        }
2161
2162        acpi_update_all_gpes();
2163
2164        acpi_pci_root_hp_init();
2165
2166 out:
2167        mutex_unlock(&acpi_scan_lock);
2168        return result;
2169}
2170
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