1 files changed, 696 insertions, 0 deletions

diff --git a/drivers/acpi/main.c b/drivers/acpi/main.c
new file mode 100644
index 00000000000..d8242772de9
--- /dev/null
+++ b/drivers/acpi/main.c
@@ -0,0 +1,696 @@
+/*
+ * sleep.c - ACPI sleep support.
+ *
+ * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
+ * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
+ * 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 <asm/io.h>
+
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include "sleep.h"
+
+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_physical_address)acpi_wakeup_address);
+
+        }
+        ACPI_FLUSH_CPU_CACHE();
+        acpi_enable_wakeup_device_prep(acpi_state);
+#endif
+        printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
+                acpi_state);
+        acpi_enter_sleep_state_prep(acpi_state);
+        return 0;
+}
+
+#ifdef CONFIG_ACPI_SLEEP
+static u32 acpi_target_sleep_state = ACPI_STATE_S0;
+/*
+ * 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;
+}
+
+/*
+ * According to the ACPI specification the BIOS should make sure that ACPI is
+ * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states.  Still,
+ * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI
+ * on such systems during resume.  Unfortunately that doesn't help in
+ * particularly pathological cases in which SCI_EN has to be set directly on
+ * resume, although the specification states very clearly that this flag is
+ * owned by the hardware.  The set_sci_en_on_resume variable will be set in such
+ * cases.
+ */
+static bool set_sci_en_on_resume;
+
+/**
+ *      acpi_pm_disable_gpes - Disable the GPEs.
+ */
+static int acpi_pm_disable_gpes(void)
+{
+        acpi_disable_all_gpes();
+        return 0;
+}
+
+/**
+ *      __acpi_pm_prepare - Prepare the platform to enter the target state.
+ *
+ *      If necessary, set the firmware waking vector and do arch-specific
+ *      nastiness to get the wakeup code to the waking vector.
+ */
+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;
+}
+
+/**
+ *      acpi_pm_prepare - Prepare the platform to enter the target sleep
+ *              state and disable the GPEs.
+ */
+static int acpi_pm_prepare(void)
+{
+        int error = __acpi_pm_prepare();
+
+        if (!error)
+                acpi_disable_all_gpes();
+        return error;
+}
+
+/**
+ *      acpi_pm_finish - Instruct the platform to leave a sleep state.
+ *
+ *      This is called after we wake back up (or if entering the sleep state
+ *      failed).
+ */
+static void acpi_pm_finish(void)
+{
+        u32 acpi_state = acpi_target_sleep_state;
+
+        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_device(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;
+}
+
+/**
+ *      acpi_pm_end - Finish up suspend sequence.
+ */
+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
+extern void do_suspend_lowlevel(void);
+
+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
+};
+
+/**
+ *      acpi_suspend_begin - Set the target system sleep state to the state
+ *              associated with given @pm_state, if supported.
+ */
+static int acpi_suspend_begin(suspend_state_t pm_state)
+{
+        u32 acpi_state = acpi_suspend_states[pm_state];
+        int error = 0;
+
+        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;
+}
+
+/**
+ *      acpi_suspend_enter - Actually enter a sleep state.
+ *      @pm_state: ignored
+ *
+ *      Flush caches and go to sleep. For STR we have to call arch-specific
+ *      assembly, which in turn call acpi_enter_sleep_state().
+ *      It's unfortunate, but it works. Please fix if you're feeling frisky.
+ */
+static int acpi_suspend_enter(suspend_state_t pm_state)
+{
+        acpi_status status = AE_OK;
+        unsigned long flags = 0;
+        u32 acpi_state = acpi_target_sleep_state;
+
+        ACPI_FLUSH_CPU_CACHE();
+
+        /* Do arch specific saving of state. */
+        if (acpi_state == ACPI_STATE_S3) {
+                int error = acpi_save_state_mem();
+
+                if (error)
+                        return error;
+        }
+
+        local_irq_save(flags);
+        acpi_enable_wakeup_device(acpi_state);
+        switch (acpi_state) {
+        case ACPI_STATE_S1:
+                barrier();
+                status = acpi_enter_sleep_state(acpi_state);
+                break;
+
+        case ACPI_STATE_S3:
+                do_suspend_lowlevel();
+                break;
+        }
+
+        /* If ACPI is not enabled by the BIOS, we need to enable it here. */
+        if (set_sci_en_on_resume)
+                acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1);
+        else
+                acpi_enable();
+
+        /* Reprogram control registers and execute _BFS */
+        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 ]
+         */
+        if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
+                acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
+
+        /*
+         * 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();
+
+        local_irq_restore(flags);
+        printk(KERN_DEBUG "Back to C!\n");
+
+        /* restore processor state */
+        if (acpi_state == ACPI_STATE_S3)
+                acpi_restore_state_mem();
+
+        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 struct platform_suspend_ops acpi_suspend_ops = {
+        .valid = acpi_suspend_state_valid,
+        .begin = acpi_suspend_begin,
+        .prepare = acpi_pm_prepare,
+        .enter = acpi_suspend_enter,
+        .finish = acpi_pm_finish,
+        .end = acpi_pm_end,
+};
+
+/**
+ *      acpi_suspend_begin_old - Set the target system sleep state to the
+ *              state associated with given @pm_state, if supported, and
+ *              execute the _PTS control method.  This function is used if the
+ *              pre-ACPI 2.0 suspend ordering has been requested.
+ */
+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 struct platform_suspend_ops acpi_suspend_ops_old = {
+        .valid = acpi_suspend_state_valid,
+        .begin = acpi_suspend_begin_old,
+        .prepare = acpi_pm_disable_gpes,
+        .enter = acpi_suspend_enter,
+        .finish = 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_set_sci_en_on_resume(const struct dmi_system_id *d)
+{
+        set_sci_en_on_resume = true;
+        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_set_sci_en_on_resume,
+        .ident = "Apple MacBook 1,1",
+        .matches = {
+                DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
+                DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"),
+                },
+        },
+        {
+        .callback = init_set_sci_en_on_resume,
+        .ident = "Apple MacMini 1,1",
+        .matches = {
+                DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
+                DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
+                },
+        },
+        {},
+};
+#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)
+{
+        acpi_target_sleep_state = ACPI_STATE_S4;
+        acpi_sleep_tts_switch(acpi_target_sleep_state);
+        return 0;
+}
+
+static int acpi_hibernation_enter(void)
+{
+        acpi_status status = AE_OK;
+        unsigned long flags = 0;
+
+        ACPI_FLUSH_CPU_CACHE();
+
+        local_irq_save(flags);
+        acpi_enable_wakeup_device(ACPI_STATE_S4);
+        /* This shouldn't return.  If it returns, we have a problem */
+        status = acpi_enter_sleep_state(ACPI_STATE_S4);
+        /* Reprogram control registers and execute _BFS */
+        acpi_leave_sleep_state_prep(ACPI_STATE_S4);
+        local_irq_restore(flags);
+
+        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 and execute _BFS */
+        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");
+        }
+}
+
+static void acpi_pm_enable_gpes(void)
+{
+        acpi_enable_all_runtime_gpes();
+}
+
+static 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_disable_gpes,
+        .restore_cleanup = acpi_pm_enable_gpes,
+};
+
+/**
+ *      acpi_hibernation_begin_old - Set the target system sleep state to
+ *              ACPI_STATE_S4 and execute the _PTS control method.  This
+ *              function is used if the pre-ACPI 2.0 suspend ordering has been
+ *              requested.
+ */
+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)
+                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 struct platform_hibernation_ops acpi_hibernation_ops_old = {
+        .begin = acpi_hibernation_begin_old,
+        .end = acpi_pm_end,
+        .pre_snapshot = acpi_pm_disable_gpes,
+        .finish = acpi_pm_finish,
+        .prepare = acpi_pm_disable_gpes,
+        .enter = acpi_hibernation_enter,
+        .leave = acpi_hibernation_leave,
+        .pre_restore = acpi_pm_disable_gpes,
+        .restore_cleanup = acpi_pm_enable_gpes,
+        .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_SLEEP
+/**
+ *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
+ *              in the system sleep state given by %acpi_target_sleep_state
+ *      @dev: device to examine; its driver model wakeup flags control
+ *              whether it should be able to wake up the system
+ *      @d_min_p: used to store the upper limit of allowed states range
+ *      Return value: preferred power state of the device on success, -ENODEV on
+ *              failure (ie. if there's no 'struct acpi_device' for @dev)
+ *
+ *      Find the lowest power (highest number) ACPI device power state that
+ *      device @dev can be in while the system is in the sleep state represented
+ *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
+ *      able to wake up the system from this sleep state.  If @d_min_p is set,
+ *      the highest power (lowest number) device power state of @dev allowed
+ *      in this system sleep state is stored at the location pointed to by it.
+ *
+ *      The caller must ensure that @dev is valid before using this function.
+ *      The caller is also responsible for figuring out if the device is
+ *      supposed to be able to wake up the system and passing this information
+ *      via @wake.
+ */
+
+int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
+{
+        acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
+        struct acpi_device *adev;
+        char acpi_method[] = "_SxD";
+        unsigned long long d_min, d_max;
+
+        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, we will return D3, but if the device has
+         * _S0W, we will use the value from _S0W
+         */
+        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.state.enabled &&
+             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)) {
+                        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_min_p)
+                *d_min_p = d_min;
+        return d_max;
+}
+
+/**
+ *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
+ *                                  capability of given device
+ *      @dev: device to handle
+ *      @enable: 'true' - enable, 'false' - disable the wake-up capability
+ */
+int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
+{
+        acpi_handle handle;
+        struct acpi_device *adev;
+
+        if (!device_may_wakeup(dev))
+                return -EINVAL;
+
+        handle = DEVICE_ACPI_HANDLE(dev);
+        if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
+                printk(KERN_DEBUG "ACPI handle has no context!\n");
+                return -ENODEV;
+        }
+
+        return enable ?
+                acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
+                acpi_disable_wakeup_device_power(adev);
+}
+#endif
+
+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("%s called\n", __func__);
+        local_irq_disable();
+        acpi_enable_wakeup_device(ACPI_STATE_S5);
+        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(" 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(" 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(" S5");
+                pm_power_off_prepare = acpi_power_off_prepare;
+                pm_power_off = acpi_power_off;
+        }
+        printk(")\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;
+}