linux/drivers/acpi/device_pm.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * drivers/acpi/device_pm.c - ACPI device power management routines.
   4 *
   5 * Copyright (C) 2012, Intel Corp.
   6 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
   7 *
   8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9 *
  10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11 */
  12
  13#define pr_fmt(fmt) "ACPI: PM: " fmt
  14
  15#include <linux/acpi.h>
  16#include <linux/export.h>
  17#include <linux/mutex.h>
  18#include <linux/pm_qos.h>
  19#include <linux/pm_domain.h>
  20#include <linux/pm_runtime.h>
  21#include <linux/suspend.h>
  22
  23#include "fan.h"
  24#include "internal.h"
  25
  26/**
  27 * acpi_power_state_string - String representation of ACPI device power state.
  28 * @state: ACPI device power state to return the string representation of.
  29 */
  30const char *acpi_power_state_string(int state)
  31{
  32        switch (state) {
  33        case ACPI_STATE_D0:
  34                return "D0";
  35        case ACPI_STATE_D1:
  36                return "D1";
  37        case ACPI_STATE_D2:
  38                return "D2";
  39        case ACPI_STATE_D3_HOT:
  40                return "D3hot";
  41        case ACPI_STATE_D3_COLD:
  42                return "D3cold";
  43        default:
  44                return "(unknown)";
  45        }
  46}
  47
  48static int acpi_dev_pm_explicit_get(struct acpi_device *device, int *state)
  49{
  50        unsigned long long psc;
  51        acpi_status status;
  52
  53        status = acpi_evaluate_integer(device->handle, "_PSC", NULL, &psc);
  54        if (ACPI_FAILURE(status))
  55                return -ENODEV;
  56
  57        *state = psc;
  58        return 0;
  59}
  60
  61/**
  62 * acpi_device_get_power - Get power state of an ACPI device.
  63 * @device: Device to get the power state of.
  64 * @state: Place to store the power state of the device.
  65 *
  66 * This function does not update the device's power.state field, but it may
  67 * update its parent's power.state field (when the parent's power state is
  68 * unknown and the device's power state turns out to be D0).
  69 *
  70 * Also, it does not update power resource reference counters to ensure that
  71 * the power state returned by it will be persistent and it may return a power
  72 * state shallower than previously set by acpi_device_set_power() for @device
  73 * (if that power state depends on any power resources).
  74 */
  75int acpi_device_get_power(struct acpi_device *device, int *state)
  76{
  77        int result = ACPI_STATE_UNKNOWN;
  78        int error;
  79
  80        if (!device || !state)
  81                return -EINVAL;
  82
  83        if (!device->flags.power_manageable) {
  84                /* TBD: Non-recursive algorithm for walking up hierarchy. */
  85                *state = device->parent ?
  86                        device->parent->power.state : ACPI_STATE_D0;
  87                goto out;
  88        }
  89
  90        /*
  91         * Get the device's power state from power resources settings and _PSC,
  92         * if available.
  93         */
  94        if (device->power.flags.power_resources) {
  95                error = acpi_power_get_inferred_state(device, &result);
  96                if (error)
  97                        return error;
  98        }
  99        if (device->power.flags.explicit_get) {
 100                int psc;
 101
 102                error = acpi_dev_pm_explicit_get(device, &psc);
 103                if (error)
 104                        return error;
 105
 106                /*
 107                 * The power resources settings may indicate a power state
 108                 * shallower than the actual power state of the device, because
 109                 * the same power resources may be referenced by other devices.
 110                 *
 111                 * For systems predating ACPI 4.0 we assume that D3hot is the
 112                 * deepest state that can be supported.
 113                 */
 114                if (psc > result && psc < ACPI_STATE_D3_COLD)
 115                        result = psc;
 116                else if (result == ACPI_STATE_UNKNOWN)
 117                        result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_HOT : psc;
 118        }
 119
 120        /*
 121         * If we were unsure about the device parent's power state up to this
 122         * point, the fact that the device is in D0 implies that the parent has
 123         * to be in D0 too, except if ignore_parent is set.
 124         */
 125        if (!device->power.flags.ignore_parent && device->parent
 126            && device->parent->power.state == ACPI_STATE_UNKNOWN
 127            && result == ACPI_STATE_D0)
 128                device->parent->power.state = ACPI_STATE_D0;
 129
 130        *state = result;
 131
 132 out:
 133        dev_dbg(&device->dev, "Device power state is %s\n",
 134                acpi_power_state_string(*state));
 135
 136        return 0;
 137}
 138
 139static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state)
 140{
 141        if (adev->power.states[state].flags.explicit_set) {
 142                char method[5] = { '_', 'P', 'S', '0' + state, '\0' };
 143                acpi_status status;
 144
 145                status = acpi_evaluate_object(adev->handle, method, NULL, NULL);
 146                if (ACPI_FAILURE(status))
 147                        return -ENODEV;
 148        }
 149        return 0;
 150}
 151
 152/**
 153 * acpi_device_set_power - Set power state of an ACPI device.
 154 * @device: Device to set the power state of.
 155 * @state: New power state to set.
 156 *
 157 * Callers must ensure that the device is power manageable before using this
 158 * function.
 159 */
 160int acpi_device_set_power(struct acpi_device *device, int state)
 161{
 162        int target_state = state;
 163        int result = 0;
 164
 165        if (!device || !device->flags.power_manageable
 166            || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
 167                return -EINVAL;
 168
 169        acpi_handle_debug(device->handle, "Power state change: %s -> %s\n",
 170                          acpi_power_state_string(device->power.state),
 171                          acpi_power_state_string(state));
 172
 173        /* Make sure this is a valid target state */
 174
 175        /* There is a special case for D0 addressed below. */
 176        if (state > ACPI_STATE_D0 && state == device->power.state) {
 177                dev_dbg(&device->dev, "Device already in %s\n",
 178                        acpi_power_state_string(state));
 179                return 0;
 180        }
 181
 182        if (state == ACPI_STATE_D3_COLD) {
 183                /*
 184                 * For transitions to D3cold we need to execute _PS3 and then
 185                 * possibly drop references to the power resources in use.
 186                 */
 187                state = ACPI_STATE_D3_HOT;
 188                /* If D3cold is not supported, use D3hot as the target state. */
 189                if (!device->power.states[ACPI_STATE_D3_COLD].flags.valid)
 190                        target_state = state;
 191        } else if (!device->power.states[state].flags.valid) {
 192                dev_warn(&device->dev, "Power state %s not supported\n",
 193                         acpi_power_state_string(state));
 194                return -ENODEV;
 195        }
 196
 197        if (!device->power.flags.ignore_parent &&
 198            device->parent && (state < device->parent->power.state)) {
 199                dev_warn(&device->dev,
 200                         "Cannot transition to power state %s for parent in %s\n",
 201                         acpi_power_state_string(state),
 202                         acpi_power_state_string(device->parent->power.state));
 203                return -ENODEV;
 204        }
 205
 206        /*
 207         * Transition Power
 208         * ----------------
 209         * In accordance with ACPI 6, _PSx is executed before manipulating power
 210         * resources, unless the target state is D0, in which case _PS0 is
 211         * supposed to be executed after turning the power resources on.
 212         */
 213        if (state > ACPI_STATE_D0) {
 214                /*
 215                 * According to ACPI 6, devices cannot go from lower-power
 216                 * (deeper) states to higher-power (shallower) states.
 217                 */
 218                if (state < device->power.state) {
 219                        dev_warn(&device->dev, "Cannot transition from %s to %s\n",
 220                                 acpi_power_state_string(device->power.state),
 221                                 acpi_power_state_string(state));
 222                        return -ENODEV;
 223                }
 224
 225                /*
 226                 * If the device goes from D3hot to D3cold, _PS3 has been
 227                 * evaluated for it already, so skip it in that case.
 228                 */
 229                if (device->power.state < ACPI_STATE_D3_HOT) {
 230                        result = acpi_dev_pm_explicit_set(device, state);
 231                        if (result)
 232                                goto end;
 233                }
 234
 235                if (device->power.flags.power_resources)
 236                        result = acpi_power_transition(device, target_state);
 237        } else {
 238                int cur_state = device->power.state;
 239
 240                if (device->power.flags.power_resources) {
 241                        result = acpi_power_transition(device, ACPI_STATE_D0);
 242                        if (result)
 243                                goto end;
 244                }
 245
 246                if (cur_state == ACPI_STATE_D0) {
 247                        int psc;
 248
 249                        /* Nothing to do here if _PSC is not present. */
 250                        if (!device->power.flags.explicit_get)
 251                                return 0;
 252
 253                        /*
 254                         * The power state of the device was set to D0 last
 255                         * time, but that might have happened before a
 256                         * system-wide transition involving the platform
 257                         * firmware, so it may be necessary to evaluate _PS0
 258                         * for the device here.  However, use extra care here
 259                         * and evaluate _PSC to check the device's current power
 260                         * state, and only invoke _PS0 if the evaluation of _PSC
 261                         * is successful and it returns a power state different
 262                         * from D0.
 263                         */
 264                        result = acpi_dev_pm_explicit_get(device, &psc);
 265                        if (result || psc == ACPI_STATE_D0)
 266                                return 0;
 267                }
 268
 269                result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);
 270        }
 271
 272 end:
 273        if (result) {
 274                dev_warn(&device->dev, "Failed to change power state to %s\n",
 275                         acpi_power_state_string(target_state));
 276        } else {
 277                device->power.state = target_state;
 278                dev_dbg(&device->dev, "Power state changed to %s\n",
 279                        acpi_power_state_string(target_state));
 280        }
 281
 282        return result;
 283}
 284EXPORT_SYMBOL(acpi_device_set_power);
 285
 286int acpi_bus_set_power(acpi_handle handle, int state)
 287{
 288        struct acpi_device *device;
 289        int result;
 290
 291        result = acpi_bus_get_device(handle, &device);
 292        if (result)
 293                return result;
 294
 295        return acpi_device_set_power(device, state);
 296}
 297EXPORT_SYMBOL(acpi_bus_set_power);
 298
 299int acpi_bus_init_power(struct acpi_device *device)
 300{
 301        int state;
 302        int result;
 303
 304        if (!device)
 305                return -EINVAL;
 306
 307        device->power.state = ACPI_STATE_UNKNOWN;
 308        if (!acpi_device_is_present(device)) {
 309                device->flags.initialized = false;
 310                return -ENXIO;
 311        }
 312
 313        result = acpi_device_get_power(device, &state);
 314        if (result)
 315                return result;
 316
 317        if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) {
 318                /* Reference count the power resources. */
 319                result = acpi_power_on_resources(device, state);
 320                if (result)
 321                        return result;
 322
 323                if (state == ACPI_STATE_D0) {
 324                        /*
 325                         * If _PSC is not present and the state inferred from
 326                         * power resources appears to be D0, it still may be
 327                         * necessary to execute _PS0 at this point, because
 328                         * another device using the same power resources may
 329                         * have been put into D0 previously and that's why we
 330                         * see D0 here.
 331                         */
 332                        result = acpi_dev_pm_explicit_set(device, state);
 333                        if (result)
 334                                return result;
 335                }
 336        } else if (state == ACPI_STATE_UNKNOWN) {
 337                /*
 338                 * No power resources and missing _PSC?  Cross fingers and make
 339                 * it D0 in hope that this is what the BIOS put the device into.
 340                 * [We tried to force D0 here by executing _PS0, but that broke
 341                 * Toshiba P870-303 in a nasty way.]
 342                 */
 343                state = ACPI_STATE_D0;
 344        }
 345        device->power.state = state;
 346        return 0;
 347}
 348
 349/**
 350 * acpi_device_fix_up_power - Force device with missing _PSC into D0.
 351 * @device: Device object whose power state is to be fixed up.
 352 *
 353 * Devices without power resources and _PSC, but having _PS0 and _PS3 defined,
 354 * are assumed to be put into D0 by the BIOS.  However, in some cases that may
 355 * not be the case and this function should be used then.
 356 */
 357int acpi_device_fix_up_power(struct acpi_device *device)
 358{
 359        int ret = 0;
 360
 361        if (!device->power.flags.power_resources
 362            && !device->power.flags.explicit_get
 363            && device->power.state == ACPI_STATE_D0)
 364                ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);
 365
 366        return ret;
 367}
 368EXPORT_SYMBOL_GPL(acpi_device_fix_up_power);
 369
 370int acpi_device_update_power(struct acpi_device *device, int *state_p)
 371{
 372        int state;
 373        int result;
 374
 375        if (device->power.state == ACPI_STATE_UNKNOWN) {
 376                result = acpi_bus_init_power(device);
 377                if (!result && state_p)
 378                        *state_p = device->power.state;
 379
 380                return result;
 381        }
 382
 383        result = acpi_device_get_power(device, &state);
 384        if (result)
 385                return result;
 386
 387        if (state == ACPI_STATE_UNKNOWN) {
 388                state = ACPI_STATE_D0;
 389                result = acpi_device_set_power(device, state);
 390                if (result)
 391                        return result;
 392        } else {
 393                if (device->power.flags.power_resources) {
 394                        /*
 395                         * We don't need to really switch the state, bu we need
 396                         * to update the power resources' reference counters.
 397                         */
 398                        result = acpi_power_transition(device, state);
 399                        if (result)
 400                                return result;
 401                }
 402                device->power.state = state;
 403        }
 404        if (state_p)
 405                *state_p = state;
 406
 407        return 0;
 408}
 409EXPORT_SYMBOL_GPL(acpi_device_update_power);
 410
 411int acpi_bus_update_power(acpi_handle handle, int *state_p)
 412{
 413        struct acpi_device *device;
 414        int result;
 415
 416        result = acpi_bus_get_device(handle, &device);
 417        return result ? result : acpi_device_update_power(device, state_p);
 418}
 419EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 420
 421bool acpi_bus_power_manageable(acpi_handle handle)
 422{
 423        struct acpi_device *device;
 424        int result;
 425
 426        result = acpi_bus_get_device(handle, &device);
 427        return result ? false : device->flags.power_manageable;
 428}
 429EXPORT_SYMBOL(acpi_bus_power_manageable);
 430
 431#ifdef CONFIG_PM
 432static DEFINE_MUTEX(acpi_pm_notifier_lock);
 433static DEFINE_MUTEX(acpi_pm_notifier_install_lock);
 434
 435void acpi_pm_wakeup_event(struct device *dev)
 436{
 437        pm_wakeup_dev_event(dev, 0, acpi_s2idle_wakeup());
 438}
 439EXPORT_SYMBOL_GPL(acpi_pm_wakeup_event);
 440
 441static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used)
 442{
 443        struct acpi_device *adev;
 444
 445        if (val != ACPI_NOTIFY_DEVICE_WAKE)
 446                return;
 447
 448        acpi_handle_debug(handle, "Wake notify\n");
 449
 450        adev = acpi_bus_get_acpi_device(handle);
 451        if (!adev)
 452                return;
 453
 454        mutex_lock(&acpi_pm_notifier_lock);
 455
 456        if (adev->wakeup.flags.notifier_present) {
 457                pm_wakeup_ws_event(adev->wakeup.ws, 0, acpi_s2idle_wakeup());
 458                if (adev->wakeup.context.func) {
 459                        acpi_handle_debug(handle, "Running %pS for %s\n",
 460                                          adev->wakeup.context.func,
 461                                          dev_name(adev->wakeup.context.dev));
 462                        adev->wakeup.context.func(&adev->wakeup.context);
 463                }
 464        }
 465
 466        mutex_unlock(&acpi_pm_notifier_lock);
 467
 468        acpi_bus_put_acpi_device(adev);
 469}
 470
 471/**
 472 * acpi_add_pm_notifier - Register PM notify handler for given ACPI device.
 473 * @adev: ACPI device to add the notify handler for.
 474 * @dev: Device to generate a wakeup event for while handling the notification.
 475 * @func: Work function to execute when handling the notification.
 476 *
 477 * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
 478 * PM wakeup events.  For example, wakeup events may be generated for bridges
 479 * if one of the devices below the bridge is signaling wakeup, even if the
 480 * bridge itself doesn't have a wakeup GPE associated with it.
 481 */
 482acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,
 483                        void (*func)(struct acpi_device_wakeup_context *context))
 484{
 485        acpi_status status = AE_ALREADY_EXISTS;
 486
 487        if (!dev && !func)
 488                return AE_BAD_PARAMETER;
 489
 490        mutex_lock(&acpi_pm_notifier_install_lock);
 491
 492        if (adev->wakeup.flags.notifier_present)
 493                goto out;
 494
 495        status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY,
 496                                             acpi_pm_notify_handler, NULL);
 497        if (ACPI_FAILURE(status))
 498                goto out;
 499
 500        mutex_lock(&acpi_pm_notifier_lock);
 501        adev->wakeup.ws = wakeup_source_register(&adev->dev,
 502                                                 dev_name(&adev->dev));
 503        adev->wakeup.context.dev = dev;
 504        adev->wakeup.context.func = func;
 505        adev->wakeup.flags.notifier_present = true;
 506        mutex_unlock(&acpi_pm_notifier_lock);
 507
 508 out:
 509        mutex_unlock(&acpi_pm_notifier_install_lock);
 510        return status;
 511}
 512
 513/**
 514 * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
 515 * @adev: ACPI device to remove the notifier from.
 516 */
 517acpi_status acpi_remove_pm_notifier(struct acpi_device *adev)
 518{
 519        acpi_status status = AE_BAD_PARAMETER;
 520
 521        mutex_lock(&acpi_pm_notifier_install_lock);
 522
 523        if (!adev->wakeup.flags.notifier_present)
 524                goto out;
 525
 526        status = acpi_remove_notify_handler(adev->handle,
 527                                            ACPI_SYSTEM_NOTIFY,
 528                                            acpi_pm_notify_handler);
 529        if (ACPI_FAILURE(status))
 530                goto out;
 531
 532        mutex_lock(&acpi_pm_notifier_lock);
 533        adev->wakeup.context.func = NULL;
 534        adev->wakeup.context.dev = NULL;
 535        wakeup_source_unregister(adev->wakeup.ws);
 536        adev->wakeup.flags.notifier_present = false;
 537        mutex_unlock(&acpi_pm_notifier_lock);
 538
 539 out:
 540        mutex_unlock(&acpi_pm_notifier_install_lock);
 541        return status;
 542}
 543
 544bool acpi_bus_can_wakeup(acpi_handle handle)
 545{
 546        struct acpi_device *device;
 547        int result;
 548
 549        result = acpi_bus_get_device(handle, &device);
 550        return result ? false : device->wakeup.flags.valid;
 551}
 552EXPORT_SYMBOL(acpi_bus_can_wakeup);
 553
 554bool acpi_pm_device_can_wakeup(struct device *dev)
 555{
 556        struct acpi_device *adev = ACPI_COMPANION(dev);
 557
 558        return adev ? acpi_device_can_wakeup(adev) : false;
 559}
 560
 561/**
 562 * acpi_dev_pm_get_state - Get preferred power state of ACPI device.
 563 * @dev: Device whose preferred target power state to return.
 564 * @adev: ACPI device node corresponding to @dev.
 565 * @target_state: System state to match the resultant device state.
 566 * @d_min_p: Location to store the highest power state available to the device.
 567 * @d_max_p: Location to store the lowest power state available to the device.
 568 *
 569 * Find the lowest power (highest number) and highest power (lowest number) ACPI
 570 * device power states that the device can be in while the system is in the
 571 * state represented by @target_state.  Store the integer numbers representing
 572 * those stats in the memory locations pointed to by @d_max_p and @d_min_p,
 573 * respectively.
 574 *
 575 * Callers must ensure that @dev and @adev are valid pointers and that @adev
 576 * actually corresponds to @dev before using this function.
 577 *
 578 * Returns 0 on success or -ENODATA when one of the ACPI methods fails or
 579 * returns a value that doesn't make sense.  The memory locations pointed to by
 580 * @d_max_p and @d_min_p are only modified on success.
 581 */
 582static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev,
 583                                 u32 target_state, int *d_min_p, int *d_max_p)
 584{
 585        char method[] = { '_', 'S', '0' + target_state, 'D', '\0' };
 586        acpi_handle handle = adev->handle;
 587        unsigned long long ret;
 588        int d_min, d_max;
 589        bool wakeup = false;
 590        bool has_sxd = false;
 591        acpi_status status;
 592
 593        /*
 594         * If the system state is S0, the lowest power state the device can be
 595         * in is D3cold, unless the device has _S0W and is supposed to signal
 596         * wakeup, in which case the return value of _S0W has to be used as the
 597         * lowest power state available to the device.
 598         */
 599        d_min = ACPI_STATE_D0;
 600        d_max = ACPI_STATE_D3_COLD;
 601
 602        /*
 603         * If present, _SxD methods return the minimum D-state (highest power
 604         * state) we can use for the corresponding S-states.  Otherwise, the
 605         * minimum D-state is D0 (ACPI 3.x).
 606         */
 607        if (target_state > ACPI_STATE_S0) {
 608                /*
 609                 * We rely on acpi_evaluate_integer() not clobbering the integer
 610                 * provided if AE_NOT_FOUND is returned.
 611                 */
 612                ret = d_min;
 613                status = acpi_evaluate_integer(handle, method, NULL, &ret);
 614                if ((ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 615                    || ret > ACPI_STATE_D3_COLD)
 616                        return -ENODATA;
 617
 618                /*
 619                 * We need to handle legacy systems where D3hot and D3cold are
 620                 * the same and 3 is returned in both cases, so fall back to
 621                 * D3cold if D3hot is not a valid state.
 622                 */
 623                if (!adev->power.states[ret].flags.valid) {
 624                        if (ret == ACPI_STATE_D3_HOT)
 625                                ret = ACPI_STATE_D3_COLD;
 626                        else
 627                                return -ENODATA;
 628                }
 629
 630                if (status == AE_OK)
 631                        has_sxd = true;
 632
 633                d_min = ret;
 634                wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
 635                        && adev->wakeup.sleep_state >= target_state;
 636        } else {
 637                wakeup = adev->wakeup.flags.valid;
 638        }
 639
 640        /*
 641         * If _PRW says we can wake up the system from the target sleep state,
 642         * the D-state returned by _SxD is sufficient for that (we assume a
 643         * wakeup-aware driver if wake is set).  Still, if _SxW exists
 644         * (ACPI 3.x), it should return the maximum (lowest power) D-state that
 645         * can wake the system.  _S0W may be valid, too.
 646         */
 647        if (wakeup) {
 648                method[3] = 'W';
 649                status = acpi_evaluate_integer(handle, method, NULL, &ret);
 650                if (status == AE_NOT_FOUND) {
 651                        /* No _SxW. In this case, the ACPI spec says that we
 652                         * must not go into any power state deeper than the
 653                         * value returned from _SxD.
 654                         */
 655                        if (has_sxd && target_state > ACPI_STATE_S0)
 656                                d_max = d_min;
 657                } else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) {
 658                        /* Fall back to D3cold if ret is not a valid state. */
 659                        if (!adev->power.states[ret].flags.valid)
 660                                ret = ACPI_STATE_D3_COLD;
 661
 662                        d_max = ret > d_min ? ret : d_min;
 663                } else {
 664                        return -ENODATA;
 665                }
 666        }
 667
 668        if (d_min_p)
 669                *d_min_p = d_min;
 670
 671        if (d_max_p)
 672                *d_max_p = d_max;
 673
 674        return 0;
 675}
 676
 677/**
 678 * acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
 679 * @dev: Device whose preferred target power state to return.
 680 * @d_min_p: Location to store the upper limit of the allowed states range.
 681 * @d_max_in: Deepest low-power state to take into consideration.
 682 * Return value: Preferred power state of the device on success, -ENODEV
 683 * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is
 684 * incorrect, or -ENODATA on ACPI method failure.
 685 *
 686 * The caller must ensure that @dev is valid before using this function.
 687 */
 688int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
 689{
 690        struct acpi_device *adev;
 691        int ret, d_min, d_max;
 692
 693        if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD)
 694                return -EINVAL;
 695
 696        if (d_max_in > ACPI_STATE_D2) {
 697                enum pm_qos_flags_status stat;
 698
 699                stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF);
 700                if (stat == PM_QOS_FLAGS_ALL)
 701                        d_max_in = ACPI_STATE_D2;
 702        }
 703
 704        adev = ACPI_COMPANION(dev);
 705        if (!adev) {
 706                dev_dbg(dev, "ACPI companion missing in %s!\n", __func__);
 707                return -ENODEV;
 708        }
 709
 710        ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(),
 711                                    &d_min, &d_max);
 712        if (ret)
 713                return ret;
 714
 715        if (d_max_in < d_min)
 716                return -EINVAL;
 717
 718        if (d_max > d_max_in) {
 719                for (d_max = d_max_in; d_max > d_min; d_max--) {
 720                        if (adev->power.states[d_max].flags.valid)
 721                                break;
 722                }
 723        }
 724
 725        if (d_min_p)
 726                *d_min_p = d_min;
 727
 728        return d_max;
 729}
 730EXPORT_SYMBOL(acpi_pm_device_sleep_state);
 731
 732/**
 733 * acpi_pm_notify_work_func - ACPI devices wakeup notification work function.
 734 * @context: Device wakeup context.
 735 */
 736static void acpi_pm_notify_work_func(struct acpi_device_wakeup_context *context)
 737{
 738        struct device *dev = context->dev;
 739
 740        if (dev) {
 741                pm_wakeup_event(dev, 0);
 742                pm_request_resume(dev);
 743        }
 744}
 745
 746static DEFINE_MUTEX(acpi_wakeup_lock);
 747
 748static int __acpi_device_wakeup_enable(struct acpi_device *adev,
 749                                       u32 target_state)
 750{
 751        struct acpi_device_wakeup *wakeup = &adev->wakeup;
 752        acpi_status status;
 753        int error = 0;
 754
 755        mutex_lock(&acpi_wakeup_lock);
 756
 757        /*
 758         * If the device wakeup power is already enabled, disable it and enable
 759         * it again in case it depends on the configuration of subordinate
 760         * devices and the conditions have changed since it was enabled last
 761         * time.
 762         */
 763        if (wakeup->enable_count > 0)
 764                acpi_disable_wakeup_device_power(adev);
 765
 766        error = acpi_enable_wakeup_device_power(adev, target_state);
 767        if (error) {
 768                if (wakeup->enable_count > 0) {
 769                        acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
 770                        wakeup->enable_count = 0;
 771                }
 772                goto out;
 773        }
 774
 775        if (wakeup->enable_count > 0)
 776                goto inc;
 777
 778        status = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
 779        if (ACPI_FAILURE(status)) {
 780                acpi_disable_wakeup_device_power(adev);
 781                error = -EIO;
 782                goto out;
 783        }
 784
 785        acpi_handle_debug(adev->handle, "GPE%2X enabled for wakeup\n",
 786                          (unsigned int)wakeup->gpe_number);
 787
 788inc:
 789        if (wakeup->enable_count < INT_MAX)
 790                wakeup->enable_count++;
 791        else
 792                acpi_handle_info(adev->handle, "Wakeup enable count out of bounds!\n");
 793
 794out:
 795        mutex_unlock(&acpi_wakeup_lock);
 796        return error;
 797}
 798
 799/**
 800 * acpi_device_wakeup_enable - Enable wakeup functionality for device.
 801 * @adev: ACPI device to enable wakeup functionality for.
 802 * @target_state: State the system is transitioning into.
 803 *
 804 * Enable the GPE associated with @adev so that it can generate wakeup signals
 805 * for the device in response to external (remote) events and enable wakeup
 806 * power for it.
 807 *
 808 * Callers must ensure that @adev is a valid ACPI device node before executing
 809 * this function.
 810 */
 811static int acpi_device_wakeup_enable(struct acpi_device *adev, u32 target_state)
 812{
 813        return __acpi_device_wakeup_enable(adev, target_state);
 814}
 815
 816/**
 817 * acpi_device_wakeup_disable - Disable wakeup functionality for device.
 818 * @adev: ACPI device to disable wakeup functionality for.
 819 *
 820 * Disable the GPE associated with @adev and disable wakeup power for it.
 821 *
 822 * Callers must ensure that @adev is a valid ACPI device node before executing
 823 * this function.
 824 */
 825static void acpi_device_wakeup_disable(struct acpi_device *adev)
 826{
 827        struct acpi_device_wakeup *wakeup = &adev->wakeup;
 828
 829        mutex_lock(&acpi_wakeup_lock);
 830
 831        if (!wakeup->enable_count)
 832                goto out;
 833
 834        acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
 835        acpi_disable_wakeup_device_power(adev);
 836
 837        wakeup->enable_count--;
 838
 839out:
 840        mutex_unlock(&acpi_wakeup_lock);
 841}
 842
 843/**
 844 * acpi_pm_set_device_wakeup - Enable/disable remote wakeup for given device.
 845 * @dev: Device to enable/disable to generate wakeup events.
 846 * @enable: Whether to enable or disable the wakeup functionality.
 847 */
 848int acpi_pm_set_device_wakeup(struct device *dev, bool enable)
 849{
 850        struct acpi_device *adev;
 851        int error;
 852
 853        adev = ACPI_COMPANION(dev);
 854        if (!adev) {
 855                dev_dbg(dev, "ACPI companion missing in %s!\n", __func__);
 856                return -ENODEV;
 857        }
 858
 859        if (!acpi_device_can_wakeup(adev))
 860                return -EINVAL;
 861
 862        if (!enable) {
 863                acpi_device_wakeup_disable(adev);
 864                dev_dbg(dev, "Wakeup disabled by ACPI\n");
 865                return 0;
 866        }
 867
 868        error = __acpi_device_wakeup_enable(adev, acpi_target_system_state());
 869        if (!error)
 870                dev_dbg(dev, "Wakeup enabled by ACPI\n");
 871
 872        return error;
 873}
 874EXPORT_SYMBOL_GPL(acpi_pm_set_device_wakeup);
 875
 876/**
 877 * acpi_dev_pm_low_power - Put ACPI device into a low-power state.
 878 * @dev: Device to put into a low-power state.
 879 * @adev: ACPI device node corresponding to @dev.
 880 * @system_state: System state to choose the device state for.
 881 */
 882static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev,
 883                                 u32 system_state)
 884{
 885        int ret, state;
 886
 887        if (!acpi_device_power_manageable(adev))
 888                return 0;
 889
 890        ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state);
 891        return ret ? ret : acpi_device_set_power(adev, state);
 892}
 893
 894/**
 895 * acpi_dev_pm_full_power - Put ACPI device into the full-power state.
 896 * @adev: ACPI device node to put into the full-power state.
 897 */
 898static int acpi_dev_pm_full_power(struct acpi_device *adev)
 899{
 900        return acpi_device_power_manageable(adev) ?
 901                acpi_device_set_power(adev, ACPI_STATE_D0) : 0;
 902}
 903
 904/**
 905 * acpi_dev_suspend - Put device into a low-power state using ACPI.
 906 * @dev: Device to put into a low-power state.
 907 * @wakeup: Whether or not to enable wakeup for the device.
 908 *
 909 * Put the given device into a low-power state using the standard ACPI
 910 * mechanism.  Set up remote wakeup if desired, choose the state to put the
 911 * device into (this checks if remote wakeup is expected to work too), and set
 912 * the power state of the device.
 913 */
 914int acpi_dev_suspend(struct device *dev, bool wakeup)
 915{
 916        struct acpi_device *adev = ACPI_COMPANION(dev);
 917        u32 target_state = acpi_target_system_state();
 918        int error;
 919
 920        if (!adev)
 921                return 0;
 922
 923        if (wakeup && acpi_device_can_wakeup(adev)) {
 924                error = acpi_device_wakeup_enable(adev, target_state);
 925                if (error)
 926                        return -EAGAIN;
 927        } else {
 928                wakeup = false;
 929        }
 930
 931        error = acpi_dev_pm_low_power(dev, adev, target_state);
 932        if (error && wakeup)
 933                acpi_device_wakeup_disable(adev);
 934
 935        return error;
 936}
 937EXPORT_SYMBOL_GPL(acpi_dev_suspend);
 938
 939/**
 940 * acpi_dev_resume - Put device into the full-power state using ACPI.
 941 * @dev: Device to put into the full-power state.
 942 *
 943 * Put the given device into the full-power state using the standard ACPI
 944 * mechanism.  Set the power state of the device to ACPI D0 and disable wakeup.
 945 */
 946int acpi_dev_resume(struct device *dev)
 947{
 948        struct acpi_device *adev = ACPI_COMPANION(dev);
 949        int error;
 950
 951        if (!adev)
 952                return 0;
 953
 954        error = acpi_dev_pm_full_power(adev);
 955        acpi_device_wakeup_disable(adev);
 956        return error;
 957}
 958EXPORT_SYMBOL_GPL(acpi_dev_resume);
 959
 960/**
 961 * acpi_subsys_runtime_suspend - Suspend device using ACPI.
 962 * @dev: Device to suspend.
 963 *
 964 * Carry out the generic runtime suspend procedure for @dev and use ACPI to put
 965 * it into a runtime low-power state.
 966 */
 967int acpi_subsys_runtime_suspend(struct device *dev)
 968{
 969        int ret = pm_generic_runtime_suspend(dev);
 970
 971        return ret ? ret : acpi_dev_suspend(dev, true);
 972}
 973EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend);
 974
 975/**
 976 * acpi_subsys_runtime_resume - Resume device using ACPI.
 977 * @dev: Device to Resume.
 978 *
 979 * Use ACPI to put the given device into the full-power state and carry out the
 980 * generic runtime resume procedure for it.
 981 */
 982int acpi_subsys_runtime_resume(struct device *dev)
 983{
 984        int ret = acpi_dev_resume(dev);
 985
 986        return ret ? ret : pm_generic_runtime_resume(dev);
 987}
 988EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume);
 989
 990#ifdef CONFIG_PM_SLEEP
 991static bool acpi_dev_needs_resume(struct device *dev, struct acpi_device *adev)
 992{
 993        u32 sys_target = acpi_target_system_state();
 994        int ret, state;
 995
 996        if (!pm_runtime_suspended(dev) || !adev || (adev->wakeup.flags.valid &&
 997            device_may_wakeup(dev) != !!adev->wakeup.prepare_count))
 998                return true;
 999
1000        if (sys_target == ACPI_STATE_S0)
1001                return false;
1002
1003        if (adev->power.flags.dsw_present)
1004                return true;
1005
1006        ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state);
1007        if (ret)
1008                return true;
1009
1010        return state != adev->power.state;
1011}
1012
1013/**
1014 * acpi_subsys_prepare - Prepare device for system transition to a sleep state.
1015 * @dev: Device to prepare.
1016 */
1017int acpi_subsys_prepare(struct device *dev)
1018{
1019        struct acpi_device *adev = ACPI_COMPANION(dev);
1020
1021        if (dev->driver && dev->driver->pm && dev->driver->pm->prepare) {
1022                int ret = dev->driver->pm->prepare(dev);
1023
1024                if (ret < 0)
1025                        return ret;
1026
1027                if (!ret && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
1028                        return 0;
1029        }
1030
1031        return !acpi_dev_needs_resume(dev, adev);
1032}
1033EXPORT_SYMBOL_GPL(acpi_subsys_prepare);
1034
1035/**
1036 * acpi_subsys_complete - Finalize device's resume during system resume.
1037 * @dev: Device to handle.
1038 */
1039void acpi_subsys_complete(struct device *dev)
1040{
1041        pm_generic_complete(dev);
1042        /*
1043         * If the device had been runtime-suspended before the system went into
1044         * the sleep state it is going out of and it has never been resumed till
1045         * now, resume it in case the firmware powered it up.
1046         */
1047        if (pm_runtime_suspended(dev) && pm_resume_via_firmware())
1048                pm_request_resume(dev);
1049}
1050EXPORT_SYMBOL_GPL(acpi_subsys_complete);
1051
1052/**
1053 * acpi_subsys_suspend - Run the device driver's suspend callback.
1054 * @dev: Device to handle.
1055 *
1056 * Follow PCI and resume devices from runtime suspend before running their
1057 * system suspend callbacks, unless the driver can cope with runtime-suspended
1058 * devices during system suspend and there are no ACPI-specific reasons for
1059 * resuming them.
1060 */
1061int acpi_subsys_suspend(struct device *dev)
1062{
1063        if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1064            acpi_dev_needs_resume(dev, ACPI_COMPANION(dev)))
1065                pm_runtime_resume(dev);
1066
1067        return pm_generic_suspend(dev);
1068}
1069EXPORT_SYMBOL_GPL(acpi_subsys_suspend);
1070
1071/**
1072 * acpi_subsys_suspend_late - Suspend device using ACPI.
1073 * @dev: Device to suspend.
1074 *
1075 * Carry out the generic late suspend procedure for @dev and use ACPI to put
1076 * it into a low-power state during system transition into a sleep state.
1077 */
1078int acpi_subsys_suspend_late(struct device *dev)
1079{
1080        int ret;
1081
1082        if (dev_pm_skip_suspend(dev))
1083                return 0;
1084
1085        ret = pm_generic_suspend_late(dev);
1086        return ret ? ret : acpi_dev_suspend(dev, device_may_wakeup(dev));
1087}
1088EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late);
1089
1090/**
1091 * acpi_subsys_suspend_noirq - Run the device driver's "noirq" suspend callback.
1092 * @dev: Device to suspend.
1093 */
1094int acpi_subsys_suspend_noirq(struct device *dev)
1095{
1096        int ret;
1097
1098        if (dev_pm_skip_suspend(dev))
1099                return 0;
1100
1101        ret = pm_generic_suspend_noirq(dev);
1102        if (ret)
1103                return ret;
1104
1105        /*
1106         * If the target system sleep state is suspend-to-idle, it is sufficient
1107         * to check whether or not the device's wakeup settings are good for
1108         * runtime PM.  Otherwise, the pm_resume_via_firmware() check will cause
1109         * acpi_subsys_complete() to take care of fixing up the device's state
1110         * anyway, if need be.
1111         */
1112        if (device_can_wakeup(dev) && !device_may_wakeup(dev))
1113                dev->power.may_skip_resume = false;
1114
1115        return 0;
1116}
1117EXPORT_SYMBOL_GPL(acpi_subsys_suspend_noirq);
1118
1119/**
1120 * acpi_subsys_resume_noirq - Run the device driver's "noirq" resume callback.
1121 * @dev: Device to handle.
1122 */
1123static int acpi_subsys_resume_noirq(struct device *dev)
1124{
1125        if (dev_pm_skip_resume(dev))
1126                return 0;
1127
1128        return pm_generic_resume_noirq(dev);
1129}
1130
1131/**
1132 * acpi_subsys_resume_early - Resume device using ACPI.
1133 * @dev: Device to Resume.
1134 *
1135 * Use ACPI to put the given device into the full-power state and carry out the
1136 * generic early resume procedure for it during system transition into the
1137 * working state.
1138 */
1139static int acpi_subsys_resume_early(struct device *dev)
1140{
1141        int ret;
1142
1143        if (dev_pm_skip_resume(dev))
1144                return 0;
1145
1146        ret = acpi_dev_resume(dev);
1147        return ret ? ret : pm_generic_resume_early(dev);
1148}
1149
1150/**
1151 * acpi_subsys_freeze - Run the device driver's freeze callback.
1152 * @dev: Device to handle.
1153 */
1154int acpi_subsys_freeze(struct device *dev)
1155{
1156        /*
1157         * Resume all runtime-suspended devices before creating a snapshot
1158         * image of system memory, because the restore kernel generally cannot
1159         * be expected to always handle them consistently and they need to be
1160         * put into the runtime-active metastate during system resume anyway,
1161         * so it is better to ensure that the state saved in the image will be
1162         * always consistent with that.
1163         */
1164        pm_runtime_resume(dev);
1165
1166        return pm_generic_freeze(dev);
1167}
1168EXPORT_SYMBOL_GPL(acpi_subsys_freeze);
1169
1170/**
1171 * acpi_subsys_restore_early - Restore device using ACPI.
1172 * @dev: Device to restore.
1173 */
1174int acpi_subsys_restore_early(struct device *dev)
1175{
1176        int ret = acpi_dev_resume(dev);
1177
1178        return ret ? ret : pm_generic_restore_early(dev);
1179}
1180EXPORT_SYMBOL_GPL(acpi_subsys_restore_early);
1181
1182/**
1183 * acpi_subsys_poweroff - Run the device driver's poweroff callback.
1184 * @dev: Device to handle.
1185 *
1186 * Follow PCI and resume devices from runtime suspend before running their
1187 * system poweroff callbacks, unless the driver can cope with runtime-suspended
1188 * devices during system suspend and there are no ACPI-specific reasons for
1189 * resuming them.
1190 */
1191int acpi_subsys_poweroff(struct device *dev)
1192{
1193        if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1194            acpi_dev_needs_resume(dev, ACPI_COMPANION(dev)))
1195                pm_runtime_resume(dev);
1196
1197        return pm_generic_poweroff(dev);
1198}
1199EXPORT_SYMBOL_GPL(acpi_subsys_poweroff);
1200
1201/**
1202 * acpi_subsys_poweroff_late - Run the device driver's poweroff callback.
1203 * @dev: Device to handle.
1204 *
1205 * Carry out the generic late poweroff procedure for @dev and use ACPI to put
1206 * it into a low-power state during system transition into a sleep state.
1207 */
1208static int acpi_subsys_poweroff_late(struct device *dev)
1209{
1210        int ret;
1211
1212        if (dev_pm_skip_suspend(dev))
1213                return 0;
1214
1215        ret = pm_generic_poweroff_late(dev);
1216        if (ret)
1217                return ret;
1218
1219        return acpi_dev_suspend(dev, device_may_wakeup(dev));
1220}
1221
1222/**
1223 * acpi_subsys_poweroff_noirq - Run the driver's "noirq" poweroff callback.
1224 * @dev: Device to suspend.
1225 */
1226static int acpi_subsys_poweroff_noirq(struct device *dev)
1227{
1228        if (dev_pm_skip_suspend(dev))
1229                return 0;
1230
1231        return pm_generic_poweroff_noirq(dev);
1232}
1233#endif /* CONFIG_PM_SLEEP */
1234
1235static struct dev_pm_domain acpi_general_pm_domain = {
1236        .ops = {
1237                .runtime_suspend = acpi_subsys_runtime_suspend,
1238                .runtime_resume = acpi_subsys_runtime_resume,
1239#ifdef CONFIG_PM_SLEEP
1240                .prepare = acpi_subsys_prepare,
1241                .complete = acpi_subsys_complete,
1242                .suspend = acpi_subsys_suspend,
1243                .suspend_late = acpi_subsys_suspend_late,
1244                .suspend_noirq = acpi_subsys_suspend_noirq,
1245                .resume_noirq = acpi_subsys_resume_noirq,
1246                .resume_early = acpi_subsys_resume_early,
1247                .freeze = acpi_subsys_freeze,
1248                .poweroff = acpi_subsys_poweroff,
1249                .poweroff_late = acpi_subsys_poweroff_late,
1250                .poweroff_noirq = acpi_subsys_poweroff_noirq,
1251                .restore_early = acpi_subsys_restore_early,
1252#endif
1253        },
1254};
1255
1256/**
1257 * acpi_dev_pm_detach - Remove ACPI power management from the device.
1258 * @dev: Device to take care of.
1259 * @power_off: Whether or not to try to remove power from the device.
1260 *
1261 * Remove the device from the general ACPI PM domain and remove its wakeup
1262 * notifier.  If @power_off is set, additionally remove power from the device if
1263 * possible.
1264 *
1265 * Callers must ensure proper synchronization of this function with power
1266 * management callbacks.
1267 */
1268static void acpi_dev_pm_detach(struct device *dev, bool power_off)
1269{
1270        struct acpi_device *adev = ACPI_COMPANION(dev);
1271
1272        if (adev && dev->pm_domain == &acpi_general_pm_domain) {
1273                dev_pm_domain_set(dev, NULL);
1274                acpi_remove_pm_notifier(adev);
1275                if (power_off) {
1276                        /*
1277                         * If the device's PM QoS resume latency limit or flags
1278                         * have been exposed to user space, they have to be
1279                         * hidden at this point, so that they don't affect the
1280                         * choice of the low-power state to put the device into.
1281                         */
1282                        dev_pm_qos_hide_latency_limit(dev);
1283                        dev_pm_qos_hide_flags(dev);
1284                        acpi_device_wakeup_disable(adev);
1285                        acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
1286                }
1287        }
1288}
1289
1290/**
1291 * acpi_dev_pm_attach - Prepare device for ACPI power management.
1292 * @dev: Device to prepare.
1293 * @power_on: Whether or not to power on the device.
1294 *
1295 * If @dev has a valid ACPI handle that has a valid struct acpi_device object
1296 * attached to it, install a wakeup notification handler for the device and
1297 * add it to the general ACPI PM domain.  If @power_on is set, the device will
1298 * be put into the ACPI D0 state before the function returns.
1299 *
1300 * This assumes that the @dev's bus type uses generic power management callbacks
1301 * (or doesn't use any power management callbacks at all).
1302 *
1303 * Callers must ensure proper synchronization of this function with power
1304 * management callbacks.
1305 */
1306int acpi_dev_pm_attach(struct device *dev, bool power_on)
1307{
1308        /*
1309         * Skip devices whose ACPI companions match the device IDs below,
1310         * because they require special power management handling incompatible
1311         * with the generic ACPI PM domain.
1312         */
1313        static const struct acpi_device_id special_pm_ids[] = {
1314                ACPI_FAN_DEVICE_IDS,
1315                {}
1316        };
1317        struct acpi_device *adev = ACPI_COMPANION(dev);
1318
1319        if (!adev || !acpi_match_device_ids(adev, special_pm_ids))
1320                return 0;
1321
1322        /*
1323         * Only attach the power domain to the first device if the
1324         * companion is shared by multiple. This is to prevent doing power
1325         * management twice.
1326         */
1327        if (!acpi_device_is_first_physical_node(adev, dev))
1328                return 0;
1329
1330        acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func);
1331        dev_pm_domain_set(dev, &acpi_general_pm_domain);
1332        if (power_on) {
1333                acpi_dev_pm_full_power(adev);
1334                acpi_device_wakeup_disable(adev);
1335        }
1336
1337        dev->pm_domain->detach = acpi_dev_pm_detach;
1338        return 1;
1339}
1340EXPORT_SYMBOL_GPL(acpi_dev_pm_attach);
1341#endif /* CONFIG_PM */
1342