sleep.c

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/*
 * sleep.c - ACPI sleep support.
 *
 * Copyright (c) 2005 Alexey Starikovskiy <[email protected]>
 * Copyright (c) 2004 David Shaohua Li <[email protected]>
 * Copyright (c) 2000-2003 Patrick Mochel
 * Copyright (c) 2003 Open Source Development Lab
 *
 * This file is released under the GPLv2.
 *
 */

#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/dmi.h>
#include <linux/device.h>
#include <linux/suspend.h>
#include <linux/reboot.h>
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>

#include <asm/io.h>

#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#include "internal.h"
#include "sleep.h"

static u8 sleep_states[ACPI_S_STATE_COUNT];

static void acpi_sleep_tts_switch(u32 acpi_state)
{
    union acpi_object in_arg = { ACPI_TYPE_INTEGER };
    struct acpi_object_list arg_list = { 1, &in_arg };
    acpi_status status = AE_OK;

    in_arg.integer.value = acpi_state;
    status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
    if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
        /*
         * OS can't evaluate the _TTS object correctly. Some warning
         * message will be printed. But it won't break anything.
         */
        printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
    }
}

static int tts_notify_reboot(struct notifier_block *this,
            unsigned long code, void *x)
{
    acpi_sleep_tts_switch(ACPI_STATE_S5);
    return NOTIFY_DONE;
}

static struct notifier_block tts_notifier = {
    .notifier_call  = tts_notify_reboot,
    .next       = NULL,
    .priority   = 0,
};

static int acpi_sleep_prepare(u32 acpi_state)
{
#ifdef CONFIG_ACPI_SLEEP
    /* do we have a wakeup address for S2 and S3? */
    if (acpi_state == ACPI_STATE_S3) {
        if (!acpi_wakeup_address)
            return -EFAULT;
        acpi_set_firmware_waking_vector(acpi_wakeup_address);

    }
    ACPI_FLUSH_CPU_CACHE();
#endif
    printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
        acpi_state);
    acpi_enable_wakeup_devices(acpi_state);
    acpi_enter_sleep_state_prep(acpi_state);
    return 0;
}

#ifdef CONFIG_ACPI_SLEEP
static u32 acpi_target_sleep_state = ACPI_STATE_S0;
static bool pwr_btn_event_pending;

/*
 * The ACPI specification wants us to save NVS memory regions during hibernation
 * and to restore them during the subsequent resume.  Windows does that also for
 * suspend to RAM.  However, it is known that this mechanism does not work on
 * all machines, so we allow the user to disable it with the help of the
 * 'acpi_sleep=nonvs' kernel command line option.
 */
static bool nvs_nosave;

void __init acpi_nvs_nosave(void)
{
    nvs_nosave = true;
}

/*
 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 * user to request that behavior by using the 'acpi_old_suspend_ordering'
 * kernel command line option that causes the following variable to be set.
 */
static bool old_suspend_ordering;

void __init acpi_old_suspend_ordering(void)
{
    old_suspend_ordering = true;
}

static int acpi_pm_freeze(void)
{
    acpi_disable_all_gpes();
    acpi_os_wait_events_complete();
    acpi_ec_block_transactions();
    return 0;
}

static int acpi_pm_pre_suspend(void)
{
    acpi_pm_freeze();
    return suspend_nvs_save();
}

static int __acpi_pm_prepare(void)
{
    int error = acpi_sleep_prepare(acpi_target_sleep_state);
    if (error)
        acpi_target_sleep_state = ACPI_STATE_S0;

    return error;
}

static int acpi_pm_prepare(void)
{
    int error = __acpi_pm_prepare();
    if (!error)
        error = acpi_pm_pre_suspend();

    return error;
}

static int find_powerf_dev(struct device *dev, void *data)
{
    struct acpi_device *device = to_acpi_device(dev);
    const char *hid = acpi_device_hid(device);

    return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
}

static void acpi_pm_finish(void)
{
    struct device *pwr_btn_dev;
    u32 acpi_state = acpi_target_sleep_state;

    acpi_ec_unblock_transactions();
    suspend_nvs_free();

    if (acpi_state == ACPI_STATE_S0)
        return;

    printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
        acpi_state);
    acpi_disable_wakeup_devices(acpi_state);
    acpi_leave_sleep_state(acpi_state);

    /* reset firmware waking vector */
    acpi_set_firmware_waking_vector((acpi_physical_address) 0);

    acpi_target_sleep_state = ACPI_STATE_S0;

    /* If we were woken with the fixed power button, provide a small
     * hint to userspace in the form of a wakeup event on the fixed power
     * button device (if it can be found).
     *
     * We delay the event generation til now, as the PM layer requires
     * timekeeping to be running before we generate events. */
    if (!pwr_btn_event_pending)
        return;

    pwr_btn_event_pending = false;
    pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
                      find_powerf_dev);
    if (pwr_btn_dev) {
        pm_wakeup_event(pwr_btn_dev, 0);
        put_device(pwr_btn_dev);
    }
}

static void acpi_pm_end(void)
{
    /*
     * This is necessary in case acpi_pm_finish() is not called during a
     * failing transition to a sleep state.
     */
    acpi_target_sleep_state = ACPI_STATE_S0;
    acpi_sleep_tts_switch(acpi_target_sleep_state);
}
#else /* !CONFIG_ACPI_SLEEP */
#define acpi_target_sleep_state ACPI_STATE_S0
#endif /* CONFIG_ACPI_SLEEP */

#ifdef CONFIG_SUSPEND
static u32 acpi_suspend_states[] = {
    [PM_SUSPEND_ON] = ACPI_STATE_S0,
    [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
    [PM_SUSPEND_MEM] = ACPI_STATE_S3,
    [PM_SUSPEND_MAX] = ACPI_STATE_S5
};

static int acpi_suspend_begin(suspend_state_t pm_state)
{
    u32 acpi_state = acpi_suspend_states[pm_state];
    int error = 0;

    error = nvs_nosave ? 0 : suspend_nvs_alloc();
    if (error)
        return error;

    if (sleep_states[acpi_state]) {
        acpi_target_sleep_state = acpi_state;
        acpi_sleep_tts_switch(acpi_target_sleep_state);
    } else {
        printk(KERN_ERR "ACPI does not support this state: %d\n",
            pm_state);
        error = -ENOSYS;
    }
    return error;
}

static int acpi_suspend_enter(suspend_state_t pm_state)
{
    acpi_status status = AE_OK;
    u32 acpi_state = acpi_target_sleep_state;
    int error;

    ACPI_FLUSH_CPU_CACHE();

    switch (acpi_state) {
    case ACPI_STATE_S1:
        barrier();
        status = acpi_enter_sleep_state(acpi_state);
        break;

    case ACPI_STATE_S3:
        error = acpi_suspend_lowlevel();
        if (error)
            return error;
        pr_info(PREFIX "Low-level resume complete\n");
        break;
    }

    /* This violates the spec but is required for bug compatibility. */
    acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);

    /* Reprogram control registers */
    acpi_leave_sleep_state_prep(acpi_state);

    /* ACPI 3.0 specs (P62) says that it's the responsibility
     * of the OSPM to clear the status bit [ implying that the
     * POWER_BUTTON event should not reach userspace ]
     *
     * However, we do generate a small hint for userspace in the form of
     * a wakeup event. We flag this condition for now and generate the
     * event later, as we're currently too early in resume to be able to
     * generate wakeup events.
     */
    if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
        acpi_event_status pwr_btn_status;

        acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);

        if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
            acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
            /* Flag for later */
            pwr_btn_event_pending = true;
        }
    }

    /*
     * Disable and clear GPE status before interrupt is enabled. Some GPEs
     * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
     * acpi_leave_sleep_state will reenable specific GPEs later
     */
    acpi_disable_all_gpes();
    /* Allow EC transactions to happen. */
    acpi_ec_unblock_transactions_early();

    suspend_nvs_restore();

    return ACPI_SUCCESS(status) ? 0 : -EFAULT;
}

static int acpi_suspend_state_valid(suspend_state_t pm_state)
{
    u32 acpi_state;

    switch (pm_state) {
    case PM_SUSPEND_ON:
    case PM_SUSPEND_STANDBY:
    case PM_SUSPEND_MEM:
        acpi_state = acpi_suspend_states[pm_state];

        return sleep_states[acpi_state];
    default:
        return 0;
    }
}

static const struct platform_suspend_ops acpi_suspend_ops = {
    .valid = acpi_suspend_state_valid,
    .begin = acpi_suspend_begin,
    .prepare_late = acpi_pm_prepare,
    .enter = acpi_suspend_enter,
    .wake = acpi_pm_finish,
    .end = acpi_pm_end,
};

static int acpi_suspend_begin_old(suspend_state_t pm_state)
{
    int error = acpi_suspend_begin(pm_state);
    if (!error)
        error = __acpi_pm_prepare();

    return error;
}

/*
 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 * been requested.
 */
static const struct platform_suspend_ops acpi_suspend_ops_old = {
    .valid = acpi_suspend_state_valid,
    .begin = acpi_suspend_begin_old,
    .prepare_late = acpi_pm_pre_suspend,
    .enter = acpi_suspend_enter,
    .wake = acpi_pm_finish,
    .end = acpi_pm_end,
    .recover = acpi_pm_finish,
};

static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
{
    old_suspend_ordering = true;
    return 0;
}

static int __init init_nvs_nosave(const struct dmi_system_id *d)
{
    acpi_nvs_nosave();
    return 0;
}

static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
    {
    .callback = init_old_suspend_ordering,
    .ident = "Abit KN9 (nForce4 variant)",
    .matches = {
        DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
        DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
        },
    },
    {
    .callback = init_old_suspend_ordering,
    .ident = "HP xw4600 Workstation",
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
        DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
        },
    },
    {
    .callback = init_old_suspend_ordering,
    .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
    .matches = {
        DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
        DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
        },
    },
    {
    .callback = init_old_suspend_ordering,
    .ident = "Panasonic CF51-2L",
    .matches = {
        DMI_MATCH(DMI_BOARD_VENDOR,
                "Matsushita Electric Industrial Co.,Ltd."),
        DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
        },
    },
    {
    .callback = init_nvs_nosave,
    .ident = "Sony Vaio VGN-FW21E",
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
        DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
        },
    },
    {
    .callback = init_nvs_nosave,
    .ident = "Sony Vaio VPCEB17FX",
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
        DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
        },
    },
    {
    .callback = init_nvs_nosave,
    .ident = "Sony Vaio VGN-SR11M",
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
        DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
        },
    },
    {
    .callback = init_nvs_nosave,
    .ident = "Everex StepNote Series",
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
        DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
        },
    },
    {
    .callback = init_nvs_nosave,
    .ident = "Sony Vaio VPCEB1Z1E",
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
        DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
        },
    },
    {
    .callback = init_nvs_nosave,
    .ident = "Sony Vaio VGN-NW130D",
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
        DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
        },
    },
    {
    .callback = init_nvs_nosave,
    .ident = "Sony Vaio VPCCW29FX",
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
        DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
        },
    },
    {
    .callback = init_nvs_nosave,
    .ident = "Averatec AV1020-ED2",
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
        DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
        },
    },
    {
    .callback = init_old_suspend_ordering,
    .ident = "Asus A8N-SLI DELUXE",
    .matches = {
        DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
        DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
        },
    },
    {
    .callback = init_old_suspend_ordering,
    .ident = "Asus A8N-SLI Premium",
    .matches = {
        DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
        DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
        },
    },
    {
    .callback = init_nvs_nosave,
    .ident = "Sony Vaio VGN-SR26GN_P",
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
        DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
        },
    },
    {
    .callback = init_nvs_nosave,
    .ident = "Sony Vaio VPCEB1S1E",
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
        DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
        },
    },
    {
    .callback = init_nvs_nosave,
    .ident = "Sony Vaio VGN-FW520F",
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
        DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
        },
    },
    {
    .callback = init_nvs_nosave,
    .ident = "Asus K54C",
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
        DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
        },
    },
    {
    .callback = init_nvs_nosave,
    .ident = "Asus K54HR",
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
        DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
        },
    },
    {},
};
#endif /* CONFIG_SUSPEND */

#ifdef CONFIG_HIBERNATION
static unsigned long s4_hardware_signature;
static struct acpi_table_facs *facs;
static bool nosigcheck;

void __init acpi_no_s4_hw_signature(void)
{
    nosigcheck = true;
}

static int acpi_hibernation_begin(void)
{
    int error;

    error = nvs_nosave ? 0 : suspend_nvs_alloc();
    if (!error) {
        acpi_target_sleep_state = ACPI_STATE_S4;
        acpi_sleep_tts_switch(acpi_target_sleep_state);
    }

    return error;
}

static int acpi_hibernation_enter(void)
{
    acpi_status status = AE_OK;

    ACPI_FLUSH_CPU_CACHE();

    /* This shouldn't return.  If it returns, we have a problem */
    status = acpi_enter_sleep_state(ACPI_STATE_S4);
    /* Reprogram control registers */
    acpi_leave_sleep_state_prep(ACPI_STATE_S4);

    return ACPI_SUCCESS(status) ? 0 : -EFAULT;
}

static void acpi_hibernation_leave(void)
{
    /*
     * If ACPI is not enabled by the BIOS and the boot kernel, we need to
     * enable it here.
     */
    acpi_enable();
    /* Reprogram control registers */
    acpi_leave_sleep_state_prep(ACPI_STATE_S4);
    /* Check the hardware signature */
    if (facs && s4_hardware_signature != facs->hardware_signature) {
        printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
            "cannot resume!\n");
        panic("ACPI S4 hardware signature mismatch");
    }
    /* Restore the NVS memory area */
    suspend_nvs_restore();
    /* Allow EC transactions to happen. */
    acpi_ec_unblock_transactions_early();
}

static void acpi_pm_thaw(void)
{
    acpi_ec_unblock_transactions();
    acpi_enable_all_runtime_gpes();
}

static const struct platform_hibernation_ops acpi_hibernation_ops = {
    .begin = acpi_hibernation_begin,
    .end = acpi_pm_end,
    .pre_snapshot = acpi_pm_prepare,
    .finish = acpi_pm_finish,
    .prepare = acpi_pm_prepare,
    .enter = acpi_hibernation_enter,
    .leave = acpi_hibernation_leave,
    .pre_restore = acpi_pm_freeze,
    .restore_cleanup = acpi_pm_thaw,
};

static int acpi_hibernation_begin_old(void)
{
    int error;
    /*
     * The _TTS object should always be evaluated before the _PTS object.
     * When the old_suspended_ordering is true, the _PTS object is
     * evaluated in the acpi_sleep_prepare.
     */
    acpi_sleep_tts_switch(ACPI_STATE_S4);

    error = acpi_sleep_prepare(ACPI_STATE_S4);

    if (!error) {
        if (!nvs_nosave)
            error = suspend_nvs_alloc();
        if (!error)
            acpi_target_sleep_state = ACPI_STATE_S4;
    }
    return error;
}

/*
 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 * been requested.
 */
static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
    .begin = acpi_hibernation_begin_old,
    .end = acpi_pm_end,
    .pre_snapshot = acpi_pm_pre_suspend,
    .prepare = acpi_pm_freeze,
    .finish = acpi_pm_finish,
    .enter = acpi_hibernation_enter,
    .leave = acpi_hibernation_leave,
    .pre_restore = acpi_pm_freeze,
    .restore_cleanup = acpi_pm_thaw,
    .recover = acpi_pm_finish,
};
#endif /* CONFIG_HIBERNATION */

int acpi_suspend(u32 acpi_state)
{
    suspend_state_t states[] = {
        [1] = PM_SUSPEND_STANDBY,
        [3] = PM_SUSPEND_MEM,
        [5] = PM_SUSPEND_MAX
    };

    if (acpi_state < 6 && states[acpi_state])
        return pm_suspend(states[acpi_state]);
    if (acpi_state == 4)
        return hibernate();
    return -EINVAL;
}

#ifdef CONFIG_PM

int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
{
    acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
    struct acpi_device *adev;
    char acpi_method[] = "_SxD";
    unsigned long long d_min, d_max;

    if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3)
        return -EINVAL;
    if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
        printk(KERN_DEBUG "ACPI handle has no context!\n");
        return -ENODEV;
    }

    acpi_method[2] = '0' + acpi_target_sleep_state;
    /*
     * If the sleep state is S0, the lowest limit from ACPI is D3,
     * but if the device has _S0W, we will use the value from _S0W
     * as the lowest limit from ACPI.  Finally, we will constrain
     * the lowest limit with the specified one.
     */
    d_min = ACPI_STATE_D0;
    d_max = ACPI_STATE_D3;

    /*
     * If present, _SxD methods return the minimum D-state (highest power
     * state) we can use for the corresponding S-states.  Otherwise, the
     * minimum D-state is D0 (ACPI 3.x).
     *
     * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
     * provided -- that's our fault recovery, we ignore retval.
     */
    if (acpi_target_sleep_state > ACPI_STATE_S0)
        acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);

    /*
     * If _PRW says we can wake up the system from the target sleep state,
     * the D-state returned by _SxD is sufficient for that (we assume a
     * wakeup-aware driver if wake is set).  Still, if _SxW exists
     * (ACPI 3.x), it should return the maximum (lowest power) D-state that
     * can wake the system.  _S0W may be valid, too.
     */
    if (acpi_target_sleep_state == ACPI_STATE_S0 ||
        (device_may_wakeup(dev) && adev->wakeup.flags.valid &&
         adev->wakeup.sleep_state >= acpi_target_sleep_state)) {
        acpi_status status;

        acpi_method[3] = 'W';
        status = acpi_evaluate_integer(handle, acpi_method, NULL,
                        &d_max);
        if (ACPI_FAILURE(status)) {
            if (acpi_target_sleep_state != ACPI_STATE_S0 ||
                status != AE_NOT_FOUND)
                d_max = d_min;
        } else if (d_max < d_min) {
            /* Warn the user of the broken DSDT */
            printk(KERN_WARNING "ACPI: Wrong value from %s\n",
                acpi_method);
            /* Sanitize it */
            d_min = d_max;
        }
    }

    if (d_max_in < d_min)
        return -EINVAL;
    if (d_min_p)
        *d_min_p = d_min;
    /* constrain d_max with specified lowest limit (max number) */
    if (d_max > d_max_in) {
        for (d_max = d_max_in; d_max > d_min; d_max--) {
            if (adev->power.states[d_max].flags.valid)
                break;
        }
    }
    return d_max;
}
EXPORT_SYMBOL(acpi_pm_device_sleep_state);
#endif /* CONFIG_PM */

#ifdef CONFIG_PM_SLEEP

int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
{
    struct acpi_device *dev;
    acpi_handle handle;

    if (!device_run_wake(phys_dev))
        return -EINVAL;

    handle = DEVICE_ACPI_HANDLE(phys_dev);
    if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
        dev_dbg(phys_dev, "ACPI handle has no context in %s!\n",
            __func__);
        return -ENODEV;
    }

    if (enable) {
        acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
        acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
    } else {
        acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
        acpi_disable_wakeup_device_power(dev);
    }

    return 0;
}
EXPORT_SYMBOL(acpi_pm_device_run_wake);

int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
{
    acpi_handle handle;
    struct acpi_device *adev;
    int error;

    if (!device_can_wakeup(dev))
        return -EINVAL;

    handle = DEVICE_ACPI_HANDLE(dev);
    if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
        dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
        return -ENODEV;
    }

    error = enable ?
        acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
        acpi_disable_wakeup_device_power(adev);
    if (!error)
        dev_info(dev, "wake-up capability %s by ACPI\n",
                enable ? "enabled" : "disabled");

    return error;
}
#endif  /* CONFIG_PM_SLEEP */

static void acpi_power_off_prepare(void)
{
    /* Prepare to power off the system */
    acpi_sleep_prepare(ACPI_STATE_S5);
    acpi_disable_all_gpes();
}

static void acpi_power_off(void)
{
    /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
    printk(KERN_DEBUG "%s called\n", __func__);
    local_irq_disable();
    acpi_enter_sleep_state(ACPI_STATE_S5);
}

int __init acpi_sleep_init(void)
{
    acpi_status status;
    u8 type_a, type_b;
#ifdef CONFIG_SUSPEND
    int i = 0;

    dmi_check_system(acpisleep_dmi_table);
#endif

    if (acpi_disabled)
        return 0;

    sleep_states[ACPI_STATE_S0] = 1;
    printk(KERN_INFO PREFIX "(supports S0");

#ifdef CONFIG_SUSPEND
    for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
        status = acpi_get_sleep_type_data(i, &type_a, &type_b);
        if (ACPI_SUCCESS(status)) {
            sleep_states[i] = 1;
            printk(KERN_CONT " S%d", i);
        }
    }

    suspend_set_ops(old_suspend_ordering ?
        &acpi_suspend_ops_old : &acpi_suspend_ops);
#endif

#ifdef CONFIG_HIBERNATION
    status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
    if (ACPI_SUCCESS(status)) {
        hibernation_set_ops(old_suspend_ordering ?
            &acpi_hibernation_ops_old : &acpi_hibernation_ops);
        sleep_states[ACPI_STATE_S4] = 1;
        printk(KERN_CONT " S4");
        if (!nosigcheck) {
            acpi_get_table(ACPI_SIG_FACS, 1,
                (struct acpi_table_header **)&facs);
            if (facs)
                s4_hardware_signature =
                    facs->hardware_signature;
        }
    }
#endif
    status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
    if (ACPI_SUCCESS(status)) {
        sleep_states[ACPI_STATE_S5] = 1;
        printk(KERN_CONT " S5");
        pm_power_off_prepare = acpi_power_off_prepare;
        pm_power_off = acpi_power_off;
    }
    printk(KERN_CONT ")\n");
    /*
     * Register the tts_notifier to reboot notifier list so that the _TTS
     * object can also be evaluated when the system enters S5.
     */
    register_reboot_notifier(&tts_notifier);
    return 0;
}