/*
   * 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 "internal.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
  ");
  	}
  }
  
  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();

  #endif

  	printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d
  ",
  		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;

  
  /*

   * 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;
  }
  
  /**

   * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.

   */

  static int acpi_pm_freeze(void)

  {

  	acpi_disable_all_gpes();

  	acpi_os_wait_events_complete(NULL);

  	acpi_ec_block_transactions();

  	return 0;
  }
  
  /**

   * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
   */
  static int acpi_pm_pre_suspend(void)
  {
  	acpi_pm_freeze();
  	suspend_nvs_save();
  	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_pm_pre_suspend();

  	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;

  	acpi_ec_unblock_transactions();

  	if (acpi_state == ACPI_STATE_S0)
  		return;

  	printk(KERN_INFO PREFIX "Waking up from system sleep state S%d
  ",
  		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;
  }
  
  /**
   *	acpi_pm_end - Finish up suspend sequence.
   */
  static void acpi_pm_end(void)
  {

  	suspend_nvs_free();

  	/*
  	 * 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;

  	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
  ",
  			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);

  	switch (acpi_state) {
  	case ACPI_STATE_S1:

  		barrier();
  		status = acpi_enter_sleep_state(acpi_state);
  		break;

  	case ACPI_STATE_S3:

  		do_suspend_lowlevel();
  		break;

  	}

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

  	/* 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();

  	/* Allow EC transactions to happen. */

  	acpi_ec_unblock_transactions_early();

  	local_irq_restore(flags);
  	printk(KERN_DEBUG "Back to C!
  ");

  	/* restore processor state */

  	if (acpi_state == ACPI_STATE_S3)

  		acpi_restore_state_mem();

  	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 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,
  };
  
  /**
   *	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_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 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"),
  		},
  	},

  	{},
  };

  #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;
  	unsigned long flags = 0;
  
  	ACPI_FLUSH_CPU_CACHE();
  
  	local_irq_save(flags);

  	/* 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!
  ");
  		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 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,

  };

  /**
   *	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) {

  		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 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_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!
  ");

  		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
  ",
  				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;

  	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!
  ", __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
  ",
  				enable ? "enabled" : "disabled");
  
  	return error;

  }

  #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(KERN_DEBUG "%s called
  ", __func__);

  	local_irq_disable();
  	acpi_enter_sleep_state(ACPI_STATE_S5);
  }

  /*
   * ACPI 2.0 created the optional _GTS and _BFS,
   * but industry adoption has been neither rapid nor broad.
   *
   * Linux gets into trouble when it executes poorly validated
   * paths through the BIOS, so disable _GTS and _BFS by default,
   * but do speak up and offer the option to enable them.
   */
  void __init acpi_gts_bfs_check(void)
  {
  	acpi_handle dummy;
  
  	if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
  	{
  		printk(KERN_NOTICE PREFIX "BIOS offers _GTS
  ");
  		printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
  			"please notify linux-acpi@vger.kernel.org
  ");
  	}
  	if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
  	{
  		printk(KERN_NOTICE PREFIX "BIOS offers _BFS
  ");
  		printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
  			"please notify linux-acpi@vger.kernel.org
  ");
  	}
  }

  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(")
  ");

  	/*
  	 * 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);

  	acpi_gts_bfs_check();

  	return 0;
  }