[mirror_ubuntu-zesty-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 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(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_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;
}

#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);
		}
	}

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