[mirror_ubuntu-artful-kernel.git] / drivers / acpi / sleep / main.c

/*
 * 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 <asm/io.h>

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

u8 sleep_states[ACPI_S_STATE_COUNT];

#ifdef CONFIG_PM_SLEEP
static u32 acpi_target_sleep_state = ACPI_STATE_S0;
#endif

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)
						virt_to_phys((void *)
							     acpi_wakeup_address));

	}
	ACPI_FLUSH_CPU_CACHE();
	acpi_enable_wakeup_device_prep(acpi_state);
#endif
	acpi_gpe_sleep_prepare(acpi_state);
	acpi_enter_sleep_state_prep(acpi_state);
	return 0;
}

#ifdef CONFIG_SUSPEND
static struct platform_suspend_ops acpi_pm_ops;

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
};

static int init_8259A_after_S1;

/**
 *	acpi_pm_set_target - Set the target system sleep state to the state
 *		associated with given @pm_state, if supported.
 */

static int acpi_pm_set_target(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;
	} else {
		printk(KERN_ERR "ACPI does not support this state: %d\n",
			pm_state);
		error = -ENOSYS;
	}
	return error;
}

/**
 *	acpi_pm_prepare - Do preliminary suspend work.
 *
 *	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_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_pm_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) {
			acpi_target_sleep_state = ACPI_STATE_S0;
			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;
	}

	/* ACPI 3.0 specs (P62) says that it's the responsabilty
	 * 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);

	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;
}

/**
 *	acpi_pm_finish - Finish up suspend sequence.
 *
 *	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_leave_sleep_state(acpi_state);
	acpi_disable_wakeup_device(acpi_state);

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

	acpi_target_sleep_state = ACPI_STATE_S0;

#ifdef CONFIG_X86
	if (init_8259A_after_S1) {
		printk("Broken toshiba laptop -> kicking interrupts\n");
		init_8259A(0);
	}
#endif
}

static int acpi_pm_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_pm_ops = {
	.valid = acpi_pm_state_valid,
	.set_target = acpi_pm_set_target,
	.prepare = acpi_pm_prepare,
	.enter = acpi_pm_enter,
	.finish = acpi_pm_finish,
};

/*
 * Toshiba fails to preserve interrupts over S1, reinitialization
 * of 8259 is needed after S1 resume.
 */
static int __init init_ints_after_s1(const struct dmi_system_id *d)
{
	printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
	init_8259A_after_S1 = 1;
	return 0;
}

static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
	{
	 .callback = init_ints_after_s1,
	 .ident = "Toshiba Satellite 4030cdt",
	 .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
	 },
	{},
};
#endif /* CONFIG_SUSPEND */

#ifdef CONFIG_HIBERNATION
static int acpi_hibernation_start(void)
{
	acpi_target_sleep_state = ACPI_STATE_S4;
	return 0;
}

static int acpi_hibernation_prepare(void)
{
	return acpi_sleep_prepare(ACPI_STATE_S4);
}

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);
	local_irq_restore(flags);

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

static void acpi_hibernation_finish(void)
{
	acpi_leave_sleep_state(ACPI_STATE_S4);
	acpi_disable_wakeup_device(ACPI_STATE_S4);

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

	acpi_target_sleep_state = ACPI_STATE_S0;
}

static int acpi_hibernation_pre_restore(void)
{
	acpi_status status;

	status = acpi_hw_disable_all_gpes();

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

static void acpi_hibernation_restore_cleanup(void)
{
	acpi_hw_enable_all_runtime_gpes();
}

static struct platform_hibernation_ops acpi_hibernation_ops = {
	.start = acpi_hibernation_start,
	.pre_snapshot = acpi_hibernation_prepare,
	.finish = acpi_hibernation_finish,
	.prepare = acpi_hibernation_prepare,
	.enter = acpi_hibernation_enter,
	.pre_restore = acpi_hibernation_pre_restore,
	.restore_cleanup = acpi_hibernation_restore_cleanup,
};
#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
 *	@wake: if set, the device 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 wake, int *d_min_p)
{
	acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
	struct acpi_device *adev;
	char acpi_method[] = "_SxD";
	unsigned 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 ||
	    (wake && adev->wakeup.state.enabled &&
	     adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
		acpi_method[3] = 'W';
		acpi_evaluate_integer(handle, acpi_method, NULL, &d_max);
		/* Sanity check */
		if (d_max < d_min)
			d_min = d_max;
	}

	if (d_min_p)
		*d_min_p = d_min;
	return d_max;
}
#endif

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

static void acpi_power_off(void)
{
	/* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
	printk("%s called\n", __FUNCTION__);
	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(" S%d", i);
		}
	}

	suspend_set_ops(&acpi_pm_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(&acpi_hibernation_ops);
		sleep_states[ACPI_STATE_S4] = 1;
		printk(" S4");
	}
#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");
	return 0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* sleep.c - ACPI sleep support.
	3	*
e2a5b420	4	* Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
1da177e4 LT	5	* Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
	6	* Copyright (c) 2000-2003 Patrick Mochel
	7	* Copyright (c) 2003 Open Source Development Lab
	8	*
	9	* This file is released under the GPLv2.
	10	*
	11	*/
	12
	13	#include <linux/delay.h>
	14	#include <linux/irq.h>
	15	#include <linux/dmi.h>
	16	#include <linux/device.h>
	17	#include <linux/suspend.h>
f216cc37 AS	18
	19	#include <asm/io.h>
	20
1da177e4 LT	21	#include <acpi/acpi_bus.h>
	22	#include <acpi/acpi_drivers.h>
	23	#include "sleep.h"
	24
	25	u8 sleep_states[ACPI_S_STATE_COUNT];
	26
853298bc	27	#ifdef CONFIG_PM_SLEEP
296699de	28	static u32 acpi_target_sleep_state = ACPI_STATE_S0;
853298bc	29	#endif
296699de	30
2f3f2226 AS	31	int acpi_sleep_prepare(u32 acpi_state)
	32	{
	33	#ifdef CONFIG_ACPI_SLEEP
	34	/* do we have a wakeup address for S2 and S3? */
	35	if (acpi_state == ACPI_STATE_S3) {
	36	if (!acpi_wakeup_address) {
	37	return -EFAULT;
	38	}
	39	acpi_set_firmware_waking_vector((acpi_physical_address)
	40	virt_to_phys((void *)
	41	acpi_wakeup_address));
	42
	43	}
	44	ACPI_FLUSH_CPU_CACHE();
	45	acpi_enable_wakeup_device_prep(acpi_state);
	46	#endif
	47	acpi_gpe_sleep_prepare(acpi_state);
	48	acpi_enter_sleep_state_prep(acpi_state);
	49	return 0;
	50	}
	51
296699de	52	#ifdef CONFIG_SUSPEND
26398a70	53	static struct platform_suspend_ops acpi_pm_ops;
1da177e4	54
1da177e4 LT	55	extern void do_suspend_lowlevel(void);
	56
	57	static u32 acpi_suspend_states[] = {
e2a5b420 AS	58	[PM_SUSPEND_ON] = ACPI_STATE_S0,
	59	[PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
	60	[PM_SUSPEND_MEM] = ACPI_STATE_S3,
e2a5b420	61	[PM_SUSPEND_MAX] = ACPI_STATE_S5
1da177e4 LT	62	};
	63
	64	static int init_8259A_after_S1;
	65
e9b3aba8 RW	66	/**
	67	* acpi_pm_set_target - Set the target system sleep state to the state
	68	* associated with given @pm_state, if supported.
	69	*/
	70
	71	static int acpi_pm_set_target(suspend_state_t pm_state)
	72	{
	73	u32 acpi_state = acpi_suspend_states[pm_state];
	74	int error = 0;
	75
	76	if (sleep_states[acpi_state]) {
	77	acpi_target_sleep_state = acpi_state;
	78	} else {
	79	printk(KERN_ERR "ACPI does not support this state: %d\n",
	80	pm_state);
	81	error = -ENOSYS;
	82	}
	83	return error;
	84	}
	85
1da177e4 LT	86	/**
1da177e4 LT	87	* acpi_pm_prepare - Do preliminary suspend work.
1da177e4	88	*
e9b3aba8 RW	89	* If necessary, set the firmware waking vector and do arch-specific
e9b3aba8 RW	90	* nastiness to get the wakeup code to the waking vector.
1da177e4 LT	91	*/
1da177e4 LT	92
e6c5eb95	93	static int acpi_pm_prepare(void)
1da177e4	94	{
e9b3aba8	95	int error = acpi_sleep_prepare(acpi_target_sleep_state);
1da177e4	96
e9b3aba8 RW	97	if (error)
	98	acpi_target_sleep_state = ACPI_STATE_S0;
	99
	100	return error;
1da177e4 LT	101	}
1da177e4 LT	102
1da177e4 LT	103	/**
1da177e4 LT	104	* acpi_pm_enter - Actually enter a sleep state.
e9b3aba8	105	* @pm_state: ignored
1da177e4	106	*
50ad147a RW	107	* Flush caches and go to sleep. For STR we have to call arch-specific
50ad147a RW	108	* assembly, which in turn call acpi_enter_sleep_state().
1da177e4 LT	109	* It's unfortunate, but it works. Please fix if you're feeling frisky.
	110	*/
	111
	112	static int acpi_pm_enter(suspend_state_t pm_state)
	113	{
	114	acpi_status status = AE_OK;
	115	unsigned long flags = 0;
e9b3aba8	116	u32 acpi_state = acpi_target_sleep_state;
1da177e4 LT	117
	118	ACPI_FLUSH_CPU_CACHE();
	119
	120	/* Do arch specific saving of state. */
50ad147a	121	if (acpi_state == ACPI_STATE_S3) {
1da177e4	122	int error = acpi_save_state_mem();
e9b3aba8 RW	123
	124	if (error) {
	125	acpi_target_sleep_state = ACPI_STATE_S0;
1da177e4	126	return error;
e9b3aba8	127	}
1da177e4 LT	128	}
1da177e4 LT	129
1da177e4 LT	130	local_irq_save(flags);
1da177e4 LT	131	acpi_enable_wakeup_device(acpi_state);
e9b3aba8 RW	132	switch (acpi_state) {
e9b3aba8 RW	133	case ACPI_STATE_S1:
1da177e4 LT	134	barrier();
	135	status = acpi_enter_sleep_state(acpi_state);
	136	break;
	137
e9b3aba8	138	case ACPI_STATE_S3:
1da177e4 LT	139	do_suspend_lowlevel();
1da177e4 LT	140	break;
1da177e4	141	}
872d83d0 AP	142
	143	/* ACPI 3.0 specs (P62) says that it's the responsabilty
	144	* of the OSPM to clear the status bit [ implying that the
	145	* POWER_BUTTON event should not reach userspace ]
	146	*/
	147	if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
	148	acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
	149
1da177e4 LT	150	local_irq_restore(flags);
	151	printk(KERN_DEBUG "Back to C!\n");
	152
e9b3aba8	153	/* restore processor state */
50ad147a	154	if (acpi_state == ACPI_STATE_S3)
1da177e4 LT	155	acpi_restore_state_mem();
1da177e4 LT	156
1da177e4 LT	157	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
	158	}
	159
1da177e4 LT	160	/**
1da177e4 LT	161	* acpi_pm_finish - Finish up suspend sequence.
1da177e4 LT	162	*
	163	* This is called after we wake back up (or if entering the sleep state
	164	* failed).
	165	*/
	166
e6c5eb95	167	static void acpi_pm_finish(void)
1da177e4	168	{
e9b3aba8	169	u32 acpi_state = acpi_target_sleep_state;
1da177e4 LT	170
	171	acpi_leave_sleep_state(acpi_state);
	172	acpi_disable_wakeup_device(acpi_state);
	173
	174	/* reset firmware waking vector */
	175	acpi_set_firmware_waking_vector((acpi_physical_address) 0);
	176
e9b3aba8 RW	177	acpi_target_sleep_state = ACPI_STATE_S0;
e9b3aba8 RW	178
e8b2fd01	179	#ifdef CONFIG_X86
1da177e4 LT	180	if (init_8259A_after_S1) {
	181	printk("Broken toshiba laptop -> kicking interrupts\n");
	182	init_8259A(0);
	183	}
e8b2fd01	184	#endif
1da177e4 LT	185	}
1da177e4 LT	186
eb9289eb SL	187	static int acpi_pm_state_valid(suspend_state_t pm_state)
eb9289eb SL	188	{
e8c9c502	189	u32 acpi_state;
eb9289eb	190
e8c9c502 JB	191	switch (pm_state) {
	192	case PM_SUSPEND_ON:
	193	case PM_SUSPEND_STANDBY:
	194	case PM_SUSPEND_MEM:
	195	acpi_state = acpi_suspend_states[pm_state];
	196
	197	return sleep_states[acpi_state];
	198	default:
	199	return 0;
	200	}
eb9289eb SL	201	}
eb9289eb SL	202
26398a70	203	static struct platform_suspend_ops acpi_pm_ops = {
eb9289eb	204	.valid = acpi_pm_state_valid,
e9b3aba8	205	.set_target = acpi_pm_set_target,
e2a5b420 AS	206	.prepare = acpi_pm_prepare,
	207	.enter = acpi_pm_enter,
	208	.finish = acpi_pm_finish,
1da177e4 LT	209	};
1da177e4 LT	210
296699de RW	211	/*
	212	* Toshiba fails to preserve interrupts over S1, reinitialization
	213	* of 8259 is needed after S1 resume.
	214	*/
1855256c	215	static int __init init_ints_after_s1(const struct dmi_system_id *d)
296699de RW	216	{
	217	printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
	218	init_8259A_after_S1 = 1;
	219	return 0;
	220	}
	221
	222	static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
	223	{
	224	.callback = init_ints_after_s1,
	225	.ident = "Toshiba Satellite 4030cdt",
	226	.matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
	227	},
	228	{},
	229	};
	230	#endif /* CONFIG_SUSPEND */
	231
b0cb1a19	232	#ifdef CONFIG_HIBERNATION
74f270af RW	233	static int acpi_hibernation_start(void)
	234	{
	235	acpi_target_sleep_state = ACPI_STATE_S4;
	236	return 0;
	237	}
	238
a3d25c27 RW	239	static int acpi_hibernation_prepare(void)
	240	{
	241	return acpi_sleep_prepare(ACPI_STATE_S4);
	242	}
	243
	244	static int acpi_hibernation_enter(void)
	245	{
	246	acpi_status status = AE_OK;
	247	unsigned long flags = 0;
	248
	249	ACPI_FLUSH_CPU_CACHE();
	250
	251	local_irq_save(flags);
	252	acpi_enable_wakeup_device(ACPI_STATE_S4);
	253	/* This shouldn't return. If it returns, we have a problem */
	254	status = acpi_enter_sleep_state(ACPI_STATE_S4);
	255	local_irq_restore(flags);
	256
	257	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
	258	}
	259
	260	static void acpi_hibernation_finish(void)
	261	{
	262	acpi_leave_sleep_state(ACPI_STATE_S4);
	263	acpi_disable_wakeup_device(ACPI_STATE_S4);
	264
	265	/* reset firmware waking vector */
	266	acpi_set_firmware_waking_vector((acpi_physical_address) 0);
74f270af RW	267
74f270af RW	268	acpi_target_sleep_state = ACPI_STATE_S0;
a3d25c27 RW	269	}
a3d25c27 RW	270
a634cc10 RW	271	static int acpi_hibernation_pre_restore(void)
	272	{
	273	acpi_status status;
	274
	275	status = acpi_hw_disable_all_gpes();
	276
	277	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
	278	}
	279
	280	static void acpi_hibernation_restore_cleanup(void)
	281	{
	282	acpi_hw_enable_all_runtime_gpes();
	283	}
	284
b3dac3b3	285	static struct platform_hibernation_ops acpi_hibernation_ops = {
74f270af RW	286	.start = acpi_hibernation_start,
	287	.pre_snapshot = acpi_hibernation_prepare,
	288	.finish = acpi_hibernation_finish,
a3d25c27 RW	289	.prepare = acpi_hibernation_prepare,
a3d25c27 RW	290	.enter = acpi_hibernation_enter,
a634cc10 RW	291	.pre_restore = acpi_hibernation_pre_restore,
a634cc10 RW	292	.restore_cleanup = acpi_hibernation_restore_cleanup,
a3d25c27	293	};
b0cb1a19	294	#endif /* CONFIG_HIBERNATION */
a3d25c27	295
296699de RW	296	int acpi_suspend(u32 acpi_state)
	297	{
	298	suspend_state_t states[] = {
	299	[1] = PM_SUSPEND_STANDBY,
	300	[3] = PM_SUSPEND_MEM,
	301	[5] = PM_SUSPEND_MAX
	302	};
	303
	304	if (acpi_state < 6 && states[acpi_state])
	305	return pm_suspend(states[acpi_state]);
	306	if (acpi_state == 4)
	307	return hibernate();
	308	return -EINVAL;
	309	}
	310
853298bc	311	#ifdef CONFIG_PM_SLEEP
fd4aff1a SL	312	/**
	313	* acpi_pm_device_sleep_state - return preferred power state of ACPI device
	314	* in the system sleep state given by %acpi_target_sleep_state
	315	* @dev: device to examine
	316	* @wake: if set, the device should be able to wake up the system
	317	* @d_min_p: used to store the upper limit of allowed states range
	318	* Return value: preferred power state of the device on success, -ENODEV on
	319	* failure (ie. if there's no 'struct acpi_device' for @dev)
	320	*
	321	* Find the lowest power (highest number) ACPI device power state that
	322	* device @dev can be in while the system is in the sleep state represented
	323	* by %acpi_target_sleep_state. If @wake is nonzero, the device should be
	324	* able to wake up the system from this sleep state. If @d_min_p is set,
	325	* the highest power (lowest number) device power state of @dev allowed
	326	* in this system sleep state is stored at the location pointed to by it.
	327	*
	328	* The caller must ensure that @dev is valid before using this function.
	329	* The caller is also responsible for figuring out if the device is
	330	* supposed to be able to wake up the system and passing this information
	331	* via @wake.
	332	*/
	333
	334	int acpi_pm_device_sleep_state(struct device dev, int wake, int d_min_p)
	335	{
	336	acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
	337	struct acpi_device *adev;
	338	char acpi_method[] = "_SxD";
	339	unsigned long d_min, d_max;
	340
	341	if (!handle \|\| ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
ead77594	342	printk(KERN_DEBUG "ACPI handle has no context!\n");
fd4aff1a SL	343	return -ENODEV;
	344	}
	345
	346	acpi_method[2] = '0' + acpi_target_sleep_state;
	347	/*
	348	* If the sleep state is S0, we will return D3, but if the device has
	349	* _S0W, we will use the value from _S0W
	350	*/
	351	d_min = ACPI_STATE_D0;
	352	d_max = ACPI_STATE_D3;
	353
	354	/*
	355	* If present, _SxD methods return the minimum D-state (highest power
	356	* state) we can use for the corresponding S-states. Otherwise, the
	357	* minimum D-state is D0 (ACPI 3.x).
	358	*
	359	* NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
	360	* provided -- that's our fault recovery, we ignore retval.
	361	*/
	362	if (acpi_target_sleep_state > ACPI_STATE_S0)
	363	acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
	364
	365	/*
	366	* If _PRW says we can wake up the system from the target sleep state,
	367	* the D-state returned by _SxD is sufficient for that (we assume a
	368	* wakeup-aware driver if wake is set). Still, if _SxW exists
	369	* (ACPI 3.x), it should return the maximum (lowest power) D-state that
	370	* can wake the system. _S0W may be valid, too.
	371	*/
	372	if (acpi_target_sleep_state == ACPI_STATE_S0 \|\|
	373	(wake && adev->wakeup.state.enabled &&
	374	adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
	375	acpi_method[3] = 'W';
	376	acpi_evaluate_integer(handle, acpi_method, NULL, &d_max);
	377	/* Sanity check */
	378	if (d_max < d_min)
	379	d_min = d_max;
	380	}
	381
	382	if (d_min_p)
	383	*d_min_p = d_min;
	384	return d_max;
	385	}
853298bc	386	#endif
fd4aff1a	387
f216cc37 AS	388	static void acpi_power_off_prepare(void)
	389	{
	390	/* Prepare to power off the system */
	391	acpi_sleep_prepare(ACPI_STATE_S5);
	392	}
	393
	394	static void acpi_power_off(void)
	395	{
	396	/* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
	397	printk("%s called\n", __FUNCTION__);
	398	local_irq_disable();
	399	acpi_enter_sleep_state(ACPI_STATE_S5);
	400	}
	401
aafbcd16	402	int __init acpi_sleep_init(void)
1da177e4	403	{
296699de RW	404	acpi_status status;
	405	u8 type_a, type_b;
	406	#ifdef CONFIG_SUSPEND
e2a5b420	407	int i = 0;
1da177e4 LT	408
1da177e4 LT	409	dmi_check_system(acpisleep_dmi_table);
296699de	410	#endif
1da177e4 LT	411
	412	if (acpi_disabled)
	413	return 0;
	414
5a50fe70 FP	415	sleep_states[ACPI_STATE_S0] = 1;
	416	printk(KERN_INFO PREFIX "(supports S0");
	417
296699de	418	#ifdef CONFIG_SUSPEND
5a50fe70	419	for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
1da177e4 LT	420	status = acpi_get_sleep_type_data(i, &type_a, &type_b);
	421	if (ACPI_SUCCESS(status)) {
	422	sleep_states[i] = 1;
	423	printk(" S%d", i);
	424	}
1da177e4	425	}
1da177e4	426
26398a70	427	suspend_set_ops(&acpi_pm_ops);
296699de	428	#endif
a3d25c27	429
b0cb1a19	430	#ifdef CONFIG_HIBERNATION
296699de RW	431	status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
296699de RW	432	if (ACPI_SUCCESS(status)) {
a3d25c27	433	hibernation_set_ops(&acpi_hibernation_ops);
296699de	434	sleep_states[ACPI_STATE_S4] = 1;
f216cc37	435	printk(" S4");
296699de	436	}
a3d25c27	437	#endif
f216cc37 AS	438	status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
	439	if (ACPI_SUCCESS(status)) {
	440	sleep_states[ACPI_STATE_S5] = 1;
	441	printk(" S5");
	442	pm_power_off_prepare = acpi_power_off_prepare;
	443	pm_power_off = acpi_power_off;
	444	}
	445	printk(")\n");
1da177e4 LT	446	return 0;
1da177e4 LT	447	}