[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_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_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;

#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_leave(void)
{
	/*
	 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
	 * enable it here.
	 */
	acpi_enable();
}

static void acpi_hibernation_finish(void)
{
	/*
	 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
	 * enable it here.
	 */
	acpi_enable();
	acpi_disable_wakeup_device(ACPI_STATE_S4);
	acpi_leave_sleep_state(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,
	.leave = acpi_hibernation_leave,
	.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_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(&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
2f3f2226 AS	47	acpi_enter_sleep_state_prep(acpi_state);
	48	return 0;
	49	}
	50
296699de	51	#ifdef CONFIG_SUSPEND
26398a70	52	static struct platform_suspend_ops acpi_pm_ops;
1da177e4	53
1da177e4 LT	54	extern void do_suspend_lowlevel(void);
	55
	56	static u32 acpi_suspend_states[] = {
e2a5b420 AS	57	[PM_SUSPEND_ON] = ACPI_STATE_S0,
	58	[PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
	59	[PM_SUSPEND_MEM] = ACPI_STATE_S3,
e2a5b420	60	[PM_SUSPEND_MAX] = ACPI_STATE_S5
1da177e4 LT	61	};
	62
	63	static int init_8259A_after_S1;
	64
e9b3aba8 RW	65	/**
	66	* acpi_pm_set_target - Set the target system sleep state to the state
	67	* associated with given @pm_state, if supported.
	68	*/
	69
	70	static int acpi_pm_set_target(suspend_state_t pm_state)
	71	{
	72	u32 acpi_state = acpi_suspend_states[pm_state];
	73	int error = 0;
	74
	75	if (sleep_states[acpi_state]) {
	76	acpi_target_sleep_state = acpi_state;
	77	} else {
	78	printk(KERN_ERR "ACPI does not support this state: %d\n",
	79	pm_state);
	80	error = -ENOSYS;
	81	}
	82	return error;
	83	}
	84
1da177e4 LT	85	/**
1da177e4 LT	86	* acpi_pm_prepare - Do preliminary suspend work.
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	*/
1da177e4 LT	91
e6c5eb95	92	static int acpi_pm_prepare(void)
1da177e4	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.
1da177e4 LT	161	*
	162	* This is called after we wake back up (or if entering the sleep state
	163	* failed).
	164	*/
	165
e6c5eb95	166	static void acpi_pm_finish(void)
1da177e4	167	{
e9b3aba8	168	u32 acpi_state = acpi_target_sleep_state;
1da177e4	169
1da177e4	170	acpi_disable_wakeup_device(acpi_state);
1dbc1fda	171	acpi_leave_sleep_state(acpi_state);
1da177e4 LT	172
	173	/* reset firmware waking vector */
	174	acpi_set_firmware_waking_vector((acpi_physical_address) 0);
	175
e9b3aba8 RW	176	acpi_target_sleep_state = ACPI_STATE_S0;
e9b3aba8 RW	177
e8b2fd01	178	#ifdef CONFIG_X86
1da177e4 LT	179	if (init_8259A_after_S1) {
	180	printk("Broken toshiba laptop -> kicking interrupts\n");
	181	init_8259A(0);
	182	}
e8b2fd01	183	#endif
1da177e4 LT	184	}
1da177e4 LT	185
eb9289eb SL	186	static int acpi_pm_state_valid(suspend_state_t pm_state)
eb9289eb SL	187	{
e8c9c502	188	u32 acpi_state;
eb9289eb	189
e8c9c502 JB	190	switch (pm_state) {
	191	case PM_SUSPEND_ON:
	192	case PM_SUSPEND_STANDBY:
	193	case PM_SUSPEND_MEM:
	194	acpi_state = acpi_suspend_states[pm_state];
	195
	196	return sleep_states[acpi_state];
	197	default:
	198	return 0;
	199	}
eb9289eb SL	200	}
eb9289eb SL	201
26398a70	202	static struct platform_suspend_ops acpi_pm_ops = {
eb9289eb	203	.valid = acpi_pm_state_valid,
e9b3aba8	204	.set_target = acpi_pm_set_target,
e2a5b420 AS	205	.prepare = acpi_pm_prepare,
	206	.enter = acpi_pm_enter,
	207	.finish = acpi_pm_finish,
1da177e4 LT	208	};
1da177e4 LT	209
296699de RW	210	/*
	211	* Toshiba fails to preserve interrupts over S1, reinitialization
	212	* of 8259 is needed after S1 resume.
	213	*/
1855256c	214	static int __init init_ints_after_s1(const struct dmi_system_id *d)
296699de RW	215	{
	216	printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
	217	init_8259A_after_S1 = 1;
	218	return 0;
	219	}
	220
	221	static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
	222	{
	223	.callback = init_ints_after_s1,
	224	.ident = "Toshiba Satellite 4030cdt",
	225	.matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
	226	},
	227	{},
	228	};
	229	#endif /* CONFIG_SUSPEND */
	230
b0cb1a19	231	#ifdef CONFIG_HIBERNATION
74f270af RW	232	static int acpi_hibernation_start(void)
	233	{
	234	acpi_target_sleep_state = ACPI_STATE_S4;
	235	return 0;
	236	}
	237
a3d25c27 RW	238	static int acpi_hibernation_prepare(void)
	239	{
	240	return acpi_sleep_prepare(ACPI_STATE_S4);
	241	}
	242
	243	static int acpi_hibernation_enter(void)
	244	{
	245	acpi_status status = AE_OK;
	246	unsigned long flags = 0;
	247
	248	ACPI_FLUSH_CPU_CACHE();
	249
	250	local_irq_save(flags);
	251	acpi_enable_wakeup_device(ACPI_STATE_S4);
	252	/* This shouldn't return. If it returns, we have a problem */
	253	status = acpi_enter_sleep_state(ACPI_STATE_S4);
	254	local_irq_restore(flags);
	255
	256	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
	257	}
	258
c7e0831d RW	259	static void acpi_hibernation_leave(void)
	260	{
	261	/*
	262	* If ACPI is not enabled by the BIOS and the boot kernel, we need to
	263	* enable it here.
	264	*/
	265	acpi_enable();
	266	}
	267
a3d25c27 RW	268	static void acpi_hibernation_finish(void)
a3d25c27 RW	269	{
8a0bb736 RW	270	/*
	271	* If ACPI is not enabled by the BIOS and the boot kernel, we need to
	272	* enable it here.
	273	*/
	274	acpi_enable();
a3d25c27	275	acpi_disable_wakeup_device(ACPI_STATE_S4);
1dbc1fda	276	acpi_leave_sleep_state(ACPI_STATE_S4);
a3d25c27 RW	277
	278	/* reset firmware waking vector */
	279	acpi_set_firmware_waking_vector((acpi_physical_address) 0);
74f270af RW	280
74f270af RW	281	acpi_target_sleep_state = ACPI_STATE_S0;
a3d25c27 RW	282	}
a3d25c27 RW	283
a634cc10 RW	284	static int acpi_hibernation_pre_restore(void)
	285	{
	286	acpi_status status;
	287
	288	status = acpi_hw_disable_all_gpes();
	289
	290	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
	291	}
	292
	293	static void acpi_hibernation_restore_cleanup(void)
	294	{
	295	acpi_hw_enable_all_runtime_gpes();
	296	}
	297
b3dac3b3	298	static struct platform_hibernation_ops acpi_hibernation_ops = {
74f270af RW	299	.start = acpi_hibernation_start,
	300	.pre_snapshot = acpi_hibernation_prepare,
	301	.finish = acpi_hibernation_finish,
a3d25c27 RW	302	.prepare = acpi_hibernation_prepare,
a3d25c27 RW	303	.enter = acpi_hibernation_enter,
c7e0831d	304	.leave = acpi_hibernation_leave,
a634cc10 RW	305	.pre_restore = acpi_hibernation_pre_restore,
a634cc10 RW	306	.restore_cleanup = acpi_hibernation_restore_cleanup,
a3d25c27	307	};
b0cb1a19	308	#endif /* CONFIG_HIBERNATION */
a3d25c27	309
296699de RW	310	int acpi_suspend(u32 acpi_state)
	311	{
	312	suspend_state_t states[] = {
	313	[1] = PM_SUSPEND_STANDBY,
	314	[3] = PM_SUSPEND_MEM,
	315	[5] = PM_SUSPEND_MAX
	316	};
	317
	318	if (acpi_state < 6 && states[acpi_state])
	319	return pm_suspend(states[acpi_state]);
	320	if (acpi_state == 4)
	321	return hibernate();
	322	return -EINVAL;
	323	}
	324
853298bc	325	#ifdef CONFIG_PM_SLEEP
fd4aff1a SL	326	/**
	327	* acpi_pm_device_sleep_state - return preferred power state of ACPI device
	328	* in the system sleep state given by %acpi_target_sleep_state
	329	* @dev: device to examine
	330	* @wake: if set, the device should be able to wake up the system
	331	* @d_min_p: used to store the upper limit of allowed states range
	332	* Return value: preferred power state of the device on success, -ENODEV on
	333	* failure (ie. if there's no 'struct acpi_device' for @dev)
	334	*
	335	* Find the lowest power (highest number) ACPI device power state that
	336	* device @dev can be in while the system is in the sleep state represented
	337	* by %acpi_target_sleep_state. If @wake is nonzero, the device should be
	338	* able to wake up the system from this sleep state. If @d_min_p is set,
	339	* the highest power (lowest number) device power state of @dev allowed
	340	* in this system sleep state is stored at the location pointed to by it.
	341	*
	342	* The caller must ensure that @dev is valid before using this function.
	343	* The caller is also responsible for figuring out if the device is
	344	* supposed to be able to wake up the system and passing this information
	345	* via @wake.
	346	*/
	347
	348	int acpi_pm_device_sleep_state(struct device dev, int wake, int d_min_p)
	349	{
	350	acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
	351	struct acpi_device *adev;
	352	char acpi_method[] = "_SxD";
	353	unsigned long d_min, d_max;
	354
	355	if (!handle \|\| ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
ead77594	356	printk(KERN_DEBUG "ACPI handle has no context!\n");
fd4aff1a SL	357	return -ENODEV;
	358	}
	359
	360	acpi_method[2] = '0' + acpi_target_sleep_state;
	361	/*
	362	* If the sleep state is S0, we will return D3, but if the device has
	363	* _S0W, we will use the value from _S0W
	364	*/
	365	d_min = ACPI_STATE_D0;
	366	d_max = ACPI_STATE_D3;
	367
	368	/*
	369	* If present, _SxD methods return the minimum D-state (highest power
	370	* state) we can use for the corresponding S-states. Otherwise, the
	371	* minimum D-state is D0 (ACPI 3.x).
	372	*
	373	* NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
	374	* provided -- that's our fault recovery, we ignore retval.
	375	*/
	376	if (acpi_target_sleep_state > ACPI_STATE_S0)
	377	acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
	378
	379	/*
	380	* If _PRW says we can wake up the system from the target sleep state,
	381	* the D-state returned by _SxD is sufficient for that (we assume a
	382	* wakeup-aware driver if wake is set). Still, if _SxW exists
	383	* (ACPI 3.x), it should return the maximum (lowest power) D-state that
	384	* can wake the system. _S0W may be valid, too.
	385	*/
	386	if (acpi_target_sleep_state == ACPI_STATE_S0 \|\|
	387	(wake && adev->wakeup.state.enabled &&
	388	adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
	389	acpi_method[3] = 'W';
	390	acpi_evaluate_integer(handle, acpi_method, NULL, &d_max);
	391	/* Sanity check */
	392	if (d_max < d_min)
	393	d_min = d_max;
	394	}
	395
	396	if (d_min_p)
	397	*d_min_p = d_min;
	398	return d_max;
	399	}
853298bc	400	#endif
fd4aff1a	401
f216cc37 AS	402	static void acpi_power_off_prepare(void)
	403	{
	404	/* Prepare to power off the system */
	405	acpi_sleep_prepare(ACPI_STATE_S5);
	406	}
	407
	408	static void acpi_power_off(void)
	409	{
	410	/* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
	411	printk("%s called\n", __FUNCTION__);
	412	local_irq_disable();
9c1c6a1b	413	acpi_enable_wakeup_device(ACPI_STATE_S5);
f216cc37 AS	414	acpi_enter_sleep_state(ACPI_STATE_S5);
	415	}
	416
aafbcd16	417	int __init acpi_sleep_init(void)
1da177e4	418	{
296699de RW	419	acpi_status status;
	420	u8 type_a, type_b;
	421	#ifdef CONFIG_SUSPEND
e2a5b420	422	int i = 0;
1da177e4 LT	423
1da177e4 LT	424	dmi_check_system(acpisleep_dmi_table);
296699de	425	#endif
1da177e4 LT	426
	427	if (acpi_disabled)
	428	return 0;
	429
5a50fe70 FP	430	sleep_states[ACPI_STATE_S0] = 1;
	431	printk(KERN_INFO PREFIX "(supports S0");
	432
296699de	433	#ifdef CONFIG_SUSPEND
5a50fe70	434	for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
1da177e4 LT	435	status = acpi_get_sleep_type_data(i, &type_a, &type_b);
	436	if (ACPI_SUCCESS(status)) {
	437	sleep_states[i] = 1;
	438	printk(" S%d", i);
	439	}
1da177e4	440	}
1da177e4	441
26398a70	442	suspend_set_ops(&acpi_pm_ops);
296699de	443	#endif
a3d25c27	444
b0cb1a19	445	#ifdef CONFIG_HIBERNATION
296699de RW	446	status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
296699de RW	447	if (ACPI_SUCCESS(status)) {
a3d25c27	448	hibernation_set_ops(&acpi_hibernation_ops);
296699de	449	sleep_states[ACPI_STATE_S4] = 1;
f216cc37	450	printk(" S4");
296699de	451	}
a3d25c27	452	#endif
f216cc37 AS	453	status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
	454	if (ACPI_SUCCESS(status)) {
	455	sleep_states[ACPI_STATE_S5] = 1;
	456	printk(" S5");
	457	pm_power_off_prepare = acpi_power_off_prepare;
	458	pm_power_off = acpi_power_off;
	459	}
	460	printk(")\n");
1da177e4 LT	461	return 0;
1da177e4 LT	462	}