[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];

static u32 acpi_target_sleep_state = ACPI_STATE_S0;

#ifdef CONFIG_SUSPEND
static struct pm_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;
}

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;
}

/**
 *	acpi_pm_prepare - Do preliminary suspend work.
 *	@pm_state: ignored
 *
 *	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(suspend_state_t pm_state)
{
	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.
 *	@pm_state: ignored
 *
 *	This is called after we wake back up (or if entering the sleep state
 *	failed). 
 */

static int acpi_pm_finish(suspend_state_t pm_state)
{
	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
	return 0;
}

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 pm_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(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_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);
}

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 hibernation_ops acpi_hibernation_ops = {
	.prepare = acpi_hibernation_prepare,
	.enter = acpi_hibernation_enter,
	.finish = acpi_hibernation_finish,
	.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;
}

/**
 *	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;
}

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);
		}
	}

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