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

static int acpi_pm_begin(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);

	/*
	 * Disable and clear GPE status before interrupt is enabled. Some GPEs
	 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
	 * acpi_leave_sleep_state will reenable specific GPEs later
	 */
	acpi_hw_disable_all_gpes();

	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 - Instruct the platform to leave a sleep state.
 *
 *	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
}

/**
 *	acpi_pm_end - Finish up suspend sequence.
 */

static void acpi_pm_end(void)
{
	/*
	 * This is necessary in case acpi_pm_finish() is not called during a
	 * failing transition to a sleep state.
	 */
	acpi_target_sleep_state = ACPI_STATE_S0;
}

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,
	.begin = acpi_pm_begin,
	.prepare = acpi_pm_prepare,
	.enter = acpi_pm_enter,
	.finish = acpi_pm_finish,
	.end = acpi_pm_end,
};

/*
 * 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)
{
	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	65	/**
c697eece	66	* acpi_pm_begin - Set the target system sleep state to the state
e9b3aba8 RW	67	* associated with given @pm_state, if supported.
	68	*/
	69
c697eece	70	static int acpi_pm_begin(suspend_state_t pm_state)
e9b3aba8 RW	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
a3627f67 SL	149	/*
	150	* Disable and clear GPE status before interrupt is enabled. Some GPEs
	151	* (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
	152	* acpi_leave_sleep_state will reenable specific GPEs later
	153	*/
	154	acpi_hw_disable_all_gpes();
	155
1da177e4 LT	156	local_irq_restore(flags);
	157	printk(KERN_DEBUG "Back to C!\n");
	158
e9b3aba8	159	/* restore processor state */
50ad147a	160	if (acpi_state == ACPI_STATE_S3)
1da177e4 LT	161	acpi_restore_state_mem();
1da177e4 LT	162
1da177e4 LT	163	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
	164	}
	165
1da177e4	166	/**
c697eece	167	* acpi_pm_finish - Instruct the platform to leave a sleep state.
1da177e4 LT	168	*
	169	* This is called after we wake back up (or if entering the sleep state
	170	* failed).
	171	*/
	172
e6c5eb95	173	static void acpi_pm_finish(void)
1da177e4	174	{
e9b3aba8	175	u32 acpi_state = acpi_target_sleep_state;
1da177e4	176
1da177e4	177	acpi_disable_wakeup_device(acpi_state);
1dbc1fda	178	acpi_leave_sleep_state(acpi_state);
1da177e4 LT	179
	180	/* reset firmware waking vector */
	181	acpi_set_firmware_waking_vector((acpi_physical_address) 0);
	182
e9b3aba8 RW	183	acpi_target_sleep_state = ACPI_STATE_S0;
e9b3aba8 RW	184
e8b2fd01	185	#ifdef CONFIG_X86
1da177e4 LT	186	if (init_8259A_after_S1) {
	187	printk("Broken toshiba laptop -> kicking interrupts\n");
	188	init_8259A(0);
	189	}
e8b2fd01	190	#endif
1da177e4 LT	191	}
1da177e4 LT	192
c697eece RW	193	/**
	194	* acpi_pm_end - Finish up suspend sequence.
	195	*/
	196
	197	static void acpi_pm_end(void)
	198	{
	199	/*
	200	* This is necessary in case acpi_pm_finish() is not called during a
	201	* failing transition to a sleep state.
	202	*/
	203	acpi_target_sleep_state = ACPI_STATE_S0;
	204	}
	205
eb9289eb SL	206	static int acpi_pm_state_valid(suspend_state_t pm_state)
eb9289eb SL	207	{
e8c9c502	208	u32 acpi_state;
eb9289eb	209
e8c9c502 JB	210	switch (pm_state) {
	211	case PM_SUSPEND_ON:
	212	case PM_SUSPEND_STANDBY:
	213	case PM_SUSPEND_MEM:
	214	acpi_state = acpi_suspend_states[pm_state];
	215
	216	return sleep_states[acpi_state];
	217	default:
	218	return 0;
	219	}
eb9289eb SL	220	}
eb9289eb SL	221
26398a70	222	static struct platform_suspend_ops acpi_pm_ops = {
eb9289eb	223	.valid = acpi_pm_state_valid,
c697eece	224	.begin = acpi_pm_begin,
e2a5b420 AS	225	.prepare = acpi_pm_prepare,
	226	.enter = acpi_pm_enter,
	227	.finish = acpi_pm_finish,
c697eece	228	.end = acpi_pm_end,
1da177e4 LT	229	};
1da177e4 LT	230
296699de RW	231	/*
	232	* Toshiba fails to preserve interrupts over S1, reinitialization
	233	* of 8259 is needed after S1 resume.
	234	*/
1855256c	235	static int __init init_ints_after_s1(const struct dmi_system_id *d)
296699de RW	236	{
	237	printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
	238	init_8259A_after_S1 = 1;
	239	return 0;
	240	}
	241
	242	static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
	243	{
	244	.callback = init_ints_after_s1,
	245	.ident = "Toshiba Satellite 4030cdt",
	246	.matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
	247	},
	248	{},
	249	};
	250	#endif /* CONFIG_SUSPEND */
	251
b0cb1a19	252	#ifdef CONFIG_HIBERNATION
74f270af RW	253	static int acpi_hibernation_start(void)
	254	{
	255	acpi_target_sleep_state = ACPI_STATE_S4;
	256	return 0;
	257	}
	258
a3d25c27 RW	259	static int acpi_hibernation_prepare(void)
	260	{
	261	return acpi_sleep_prepare(ACPI_STATE_S4);
	262	}
	263
	264	static int acpi_hibernation_enter(void)
	265	{
	266	acpi_status status = AE_OK;
	267	unsigned long flags = 0;
	268
	269	ACPI_FLUSH_CPU_CACHE();
	270
	271	local_irq_save(flags);
	272	acpi_enable_wakeup_device(ACPI_STATE_S4);
	273	/* This shouldn't return. If it returns, we have a problem */
	274	status = acpi_enter_sleep_state(ACPI_STATE_S4);
	275	local_irq_restore(flags);
	276
	277	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
	278	}
	279
c7e0831d RW	280	static void acpi_hibernation_leave(void)
	281	{
	282	/*
	283	* If ACPI is not enabled by the BIOS and the boot kernel, we need to
	284	* enable it here.
	285	*/
	286	acpi_enable();
	287	}
	288
a3d25c27 RW	289	static void acpi_hibernation_finish(void)
a3d25c27 RW	290	{
a3d25c27	291	acpi_disable_wakeup_device(ACPI_STATE_S4);
1dbc1fda	292	acpi_leave_sleep_state(ACPI_STATE_S4);
a3d25c27 RW	293
	294	/* reset firmware waking vector */
	295	acpi_set_firmware_waking_vector((acpi_physical_address) 0);
74f270af RW	296
74f270af RW	297	acpi_target_sleep_state = ACPI_STATE_S0;
a3d25c27 RW	298	}
a3d25c27 RW	299
a634cc10 RW	300	static int acpi_hibernation_pre_restore(void)
	301	{
	302	acpi_status status;
	303
	304	status = acpi_hw_disable_all_gpes();
	305
	306	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
	307	}
	308
	309	static void acpi_hibernation_restore_cleanup(void)
	310	{
	311	acpi_hw_enable_all_runtime_gpes();
	312	}
	313
b3dac3b3	314	static struct platform_hibernation_ops acpi_hibernation_ops = {
74f270af RW	315	.start = acpi_hibernation_start,
	316	.pre_snapshot = acpi_hibernation_prepare,
	317	.finish = acpi_hibernation_finish,
a3d25c27 RW	318	.prepare = acpi_hibernation_prepare,
a3d25c27 RW	319	.enter = acpi_hibernation_enter,
c7e0831d	320	.leave = acpi_hibernation_leave,
a634cc10 RW	321	.pre_restore = acpi_hibernation_pre_restore,
a634cc10 RW	322	.restore_cleanup = acpi_hibernation_restore_cleanup,
a3d25c27	323	};
b0cb1a19	324	#endif /* CONFIG_HIBERNATION */
a3d25c27	325
296699de RW	326	int acpi_suspend(u32 acpi_state)
	327	{
	328	suspend_state_t states[] = {
	329	[1] = PM_SUSPEND_STANDBY,
	330	[3] = PM_SUSPEND_MEM,
	331	[5] = PM_SUSPEND_MAX
	332	};
	333
	334	if (acpi_state < 6 && states[acpi_state])
	335	return pm_suspend(states[acpi_state]);
	336	if (acpi_state == 4)
	337	return hibernate();
	338	return -EINVAL;
	339	}
	340
853298bc	341	#ifdef CONFIG_PM_SLEEP
fd4aff1a SL	342	/**
	343	* acpi_pm_device_sleep_state - return preferred power state of ACPI device
	344	* in the system sleep state given by %acpi_target_sleep_state
	345	* @dev: device to examine
	346	* @wake: if set, the device should be able to wake up the system
	347	* @d_min_p: used to store the upper limit of allowed states range
	348	* Return value: preferred power state of the device on success, -ENODEV on
	349	* failure (ie. if there's no 'struct acpi_device' for @dev)
	350	*
	351	* Find the lowest power (highest number) ACPI device power state that
	352	* device @dev can be in while the system is in the sleep state represented
	353	* by %acpi_target_sleep_state. If @wake is nonzero, the device should be
	354	* able to wake up the system from this sleep state. If @d_min_p is set,
	355	* the highest power (lowest number) device power state of @dev allowed
	356	* in this system sleep state is stored at the location pointed to by it.
	357	*
	358	* The caller must ensure that @dev is valid before using this function.
	359	* The caller is also responsible for figuring out if the device is
	360	* supposed to be able to wake up the system and passing this information
	361	* via @wake.
	362	*/
	363
	364	int acpi_pm_device_sleep_state(struct device dev, int wake, int d_min_p)
	365	{
	366	acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
	367	struct acpi_device *adev;
	368	char acpi_method[] = "_SxD";
	369	unsigned long d_min, d_max;
	370
	371	if (!handle \|\| ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
ead77594	372	printk(KERN_DEBUG "ACPI handle has no context!\n");
fd4aff1a SL	373	return -ENODEV;
	374	}
	375
	376	acpi_method[2] = '0' + acpi_target_sleep_state;
	377	/*
	378	* If the sleep state is S0, we will return D3, but if the device has
	379	* _S0W, we will use the value from _S0W
	380	*/
	381	d_min = ACPI_STATE_D0;
	382	d_max = ACPI_STATE_D3;
	383
	384	/*
	385	* If present, _SxD methods return the minimum D-state (highest power
	386	* state) we can use for the corresponding S-states. Otherwise, the
	387	* minimum D-state is D0 (ACPI 3.x).
	388	*
	389	* NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
	390	* provided -- that's our fault recovery, we ignore retval.
	391	*/
	392	if (acpi_target_sleep_state > ACPI_STATE_S0)
	393	acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
	394
	395	/*
	396	* If _PRW says we can wake up the system from the target sleep state,
	397	* the D-state returned by _SxD is sufficient for that (we assume a
	398	* wakeup-aware driver if wake is set). Still, if _SxW exists
	399	* (ACPI 3.x), it should return the maximum (lowest power) D-state that
	400	* can wake the system. _S0W may be valid, too.
	401	*/
	402	if (acpi_target_sleep_state == ACPI_STATE_S0 \|\|
	403	(wake && adev->wakeup.state.enabled &&
	404	adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
	405	acpi_method[3] = 'W';
	406	acpi_evaluate_integer(handle, acpi_method, NULL, &d_max);
	407	/* Sanity check */
	408	if (d_max < d_min)
	409	d_min = d_max;
	410	}
	411
	412	if (d_min_p)
	413	*d_min_p = d_min;
	414	return d_max;
	415	}
853298bc	416	#endif
fd4aff1a	417
f216cc37 AS	418	static void acpi_power_off_prepare(void)
	419	{
	420	/* Prepare to power off the system */
	421	acpi_sleep_prepare(ACPI_STATE_S5);
	422	}
	423
	424	static void acpi_power_off(void)
	425	{
	426	/* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
	427	printk("%s called\n", __FUNCTION__);
	428	local_irq_disable();
9c1c6a1b	429	acpi_enable_wakeup_device(ACPI_STATE_S5);
f216cc37 AS	430	acpi_enter_sleep_state(ACPI_STATE_S5);
	431	}
	432
aafbcd16	433	int __init acpi_sleep_init(void)
1da177e4	434	{
296699de RW	435	acpi_status status;
	436	u8 type_a, type_b;
	437	#ifdef CONFIG_SUSPEND
e2a5b420	438	int i = 0;
1da177e4 LT	439
1da177e4 LT	440	dmi_check_system(acpisleep_dmi_table);
296699de	441	#endif
1da177e4 LT	442
	443	if (acpi_disabled)
	444	return 0;
	445
5a50fe70 FP	446	sleep_states[ACPI_STATE_S0] = 1;
	447	printk(KERN_INFO PREFIX "(supports S0");
	448
296699de	449	#ifdef CONFIG_SUSPEND
5a50fe70	450	for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
1da177e4 LT	451	status = acpi_get_sleep_type_data(i, &type_a, &type_b);
	452	if (ACPI_SUCCESS(status)) {
	453	sleep_states[i] = 1;
	454	printk(" S%d", i);
	455	}
1da177e4	456	}
1da177e4	457
26398a70	458	suspend_set_ops(&acpi_pm_ops);
296699de	459	#endif
a3d25c27	460
b0cb1a19	461	#ifdef CONFIG_HIBERNATION
296699de RW	462	status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
296699de RW	463	if (ACPI_SUCCESS(status)) {
a3d25c27	464	hibernation_set_ops(&acpi_hibernation_ops);
296699de	465	sleep_states[ACPI_STATE_S4] = 1;
f216cc37	466	printk(" S4");
296699de	467	}
a3d25c27	468	#endif
f216cc37 AS	469	status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
	470	if (ACPI_SUCCESS(status)) {
	471	sleep_states[ACPI_STATE_S5] = 1;
	472	printk(" S5");
	473	pm_power_off_prepare = acpi_power_off_prepare;
	474	pm_power_off = acpi_power_off;
	475	}
	476	printk(")\n");
1da177e4 LT	477	return 0;
1da177e4 LT	478	}