[mirror_ubuntu-hirsute-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 <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;
}

/**
 *	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;
}

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;

#ifdef CONFIG_SUSPEND
	printk(KERN_INFO PREFIX "(supports");
	for (i = ACPI_STATE_S0; 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);
		}
	}
	printk(")\n");

	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;
	}
#else
	sleep_states[ACPI_STATE_S4] = 0;
#endif

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