[GitHub/mt8127/android_kernel_alcatel_ttab.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;

	error = acpi_sleep_prepare(acpi_target_sleep_state);
	if (error)
		acpi_target_sleep_state = ACPI_STATE_S0;
	else if (!ACPI_SUCCESS(acpi_hw_disable_all_gpes()))
		error = -EFAULT;

	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;
	}

	/* Reprogram control registers and execute _BFS */
	acpi_leave_sleep_state_prep(acpi_state);

	/* 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)
{
	int error;

	error = acpi_sleep_prepare(ACPI_STATE_S4);
	if (error)
		return error;

	if (!ACPI_SUCCESS(acpi_hw_disable_all_gpes()))
		error = -EFAULT;

	return error;
}

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);
	/* Reprogram control registers and execute _BFS */
	acpi_leave_sleep_state_prep(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();
	/* Reprogram control registers and execute _BFS */
	acpi_leave_sleep_state_prep(ACPI_STATE_S4);
}

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);
	acpi_hw_disable_all_gpes();
}

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	{
3c1d2b60	94	int error;
1da177e4	95
3c1d2b60	96	error = acpi_sleep_prepare(acpi_target_sleep_state);
e9b3aba8 RW	97	if (error)
e9b3aba8 RW	98	acpi_target_sleep_state = ACPI_STATE_S0;
3c1d2b60 RW	99	else if (!ACPI_SUCCESS(acpi_hw_disable_all_gpes()))
3c1d2b60 RW	100	error = -EFAULT;
e9b3aba8 RW	101
e9b3aba8 RW	102	return error;
1da177e4 LT	103	}
1da177e4 LT	104
1da177e4 LT	105	/**
1da177e4 LT	106	* acpi_pm_enter - Actually enter a sleep state.
e9b3aba8	107	* @pm_state: ignored
1da177e4	108	*
50ad147a RW	109	* Flush caches and go to sleep. For STR we have to call arch-specific
50ad147a RW	110	* assembly, which in turn call acpi_enter_sleep_state().
1da177e4 LT	111	* It's unfortunate, but it works. Please fix if you're feeling frisky.
	112	*/
	113
	114	static int acpi_pm_enter(suspend_state_t pm_state)
	115	{
	116	acpi_status status = AE_OK;
	117	unsigned long flags = 0;
e9b3aba8	118	u32 acpi_state = acpi_target_sleep_state;
1da177e4 LT	119
	120	ACPI_FLUSH_CPU_CACHE();
	121
	122	/* Do arch specific saving of state. */
50ad147a	123	if (acpi_state == ACPI_STATE_S3) {
1da177e4	124	int error = acpi_save_state_mem();
e9b3aba8 RW	125
	126	if (error) {
	127	acpi_target_sleep_state = ACPI_STATE_S0;
1da177e4	128	return error;
e9b3aba8	129	}
1da177e4 LT	130	}
1da177e4 LT	131
1da177e4 LT	132	local_irq_save(flags);
1da177e4 LT	133	acpi_enable_wakeup_device(acpi_state);
e9b3aba8 RW	134	switch (acpi_state) {
e9b3aba8 RW	135	case ACPI_STATE_S1:
1da177e4 LT	136	barrier();
	137	status = acpi_enter_sleep_state(acpi_state);
	138	break;
	139
e9b3aba8	140	case ACPI_STATE_S3:
1da177e4 LT	141	do_suspend_lowlevel();
1da177e4 LT	142	break;
1da177e4	143	}
872d83d0	144
c95d47a8 RW	145	/* Reprogram control registers and execute _BFS */
	146	acpi_leave_sleep_state_prep(acpi_state);
	147
872d83d0 AP	148	/* ACPI 3.0 specs (P62) says that it's the responsabilty
	149	* of the OSPM to clear the status bit [ implying that the
	150	* POWER_BUTTON event should not reach userspace ]
	151	*/
	152	if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
	153	acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
	154
a3627f67 SL	155	/*
	156	* Disable and clear GPE status before interrupt is enabled. Some GPEs
	157	* (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
	158	* acpi_leave_sleep_state will reenable specific GPEs later
	159	*/
	160	acpi_hw_disable_all_gpes();
	161
1da177e4 LT	162	local_irq_restore(flags);
	163	printk(KERN_DEBUG "Back to C!\n");
	164
e9b3aba8	165	/* restore processor state */
50ad147a	166	if (acpi_state == ACPI_STATE_S3)
1da177e4 LT	167	acpi_restore_state_mem();
1da177e4 LT	168
1da177e4 LT	169	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
	170	}
	171
1da177e4	172	/**
c697eece	173	* acpi_pm_finish - Instruct the platform to leave a sleep state.
1da177e4 LT	174	*
	175	* This is called after we wake back up (or if entering the sleep state
	176	* failed).
	177	*/
	178
e6c5eb95	179	static void acpi_pm_finish(void)
1da177e4	180	{
e9b3aba8	181	u32 acpi_state = acpi_target_sleep_state;
1da177e4	182
1da177e4	183	acpi_disable_wakeup_device(acpi_state);
1dbc1fda	184	acpi_leave_sleep_state(acpi_state);
1da177e4 LT	185
	186	/* reset firmware waking vector */
	187	acpi_set_firmware_waking_vector((acpi_physical_address) 0);
	188
e9b3aba8 RW	189	acpi_target_sleep_state = ACPI_STATE_S0;
e9b3aba8 RW	190
e8b2fd01	191	#ifdef CONFIG_X86
1da177e4 LT	192	if (init_8259A_after_S1) {
	193	printk("Broken toshiba laptop -> kicking interrupts\n");
	194	init_8259A(0);
	195	}
e8b2fd01	196	#endif
1da177e4 LT	197	}
1da177e4 LT	198
c697eece RW	199	/**
	200	* acpi_pm_end - Finish up suspend sequence.
	201	*/
	202
	203	static void acpi_pm_end(void)
	204	{
	205	/*
	206	* This is necessary in case acpi_pm_finish() is not called during a
	207	* failing transition to a sleep state.
	208	*/
	209	acpi_target_sleep_state = ACPI_STATE_S0;
	210	}
	211
eb9289eb SL	212	static int acpi_pm_state_valid(suspend_state_t pm_state)
eb9289eb SL	213	{
e8c9c502	214	u32 acpi_state;
eb9289eb	215
e8c9c502 JB	216	switch (pm_state) {
	217	case PM_SUSPEND_ON:
	218	case PM_SUSPEND_STANDBY:
	219	case PM_SUSPEND_MEM:
	220	acpi_state = acpi_suspend_states[pm_state];
	221
	222	return sleep_states[acpi_state];
	223	default:
	224	return 0;
	225	}
eb9289eb SL	226	}
eb9289eb SL	227
26398a70	228	static struct platform_suspend_ops acpi_pm_ops = {
eb9289eb	229	.valid = acpi_pm_state_valid,
c697eece	230	.begin = acpi_pm_begin,
e2a5b420 AS	231	.prepare = acpi_pm_prepare,
	232	.enter = acpi_pm_enter,
	233	.finish = acpi_pm_finish,
c697eece	234	.end = acpi_pm_end,
1da177e4 LT	235	};
1da177e4 LT	236
296699de RW	237	/*
	238	* Toshiba fails to preserve interrupts over S1, reinitialization
	239	* of 8259 is needed after S1 resume.
	240	*/
1855256c	241	static int __init init_ints_after_s1(const struct dmi_system_id *d)
296699de RW	242	{
	243	printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
	244	init_8259A_after_S1 = 1;
	245	return 0;
	246	}
	247
	248	static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
	249	{
	250	.callback = init_ints_after_s1,
	251	.ident = "Toshiba Satellite 4030cdt",
	252	.matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
	253	},
	254	{},
	255	};
	256	#endif /* CONFIG_SUSPEND */
	257
b0cb1a19	258	#ifdef CONFIG_HIBERNATION
74f270af RW	259	static int acpi_hibernation_start(void)
	260	{
	261	acpi_target_sleep_state = ACPI_STATE_S4;
	262	return 0;
	263	}
	264
a3d25c27 RW	265	static int acpi_hibernation_prepare(void)
a3d25c27 RW	266	{
3c1d2b60 RW	267	int error;
	268
	269	error = acpi_sleep_prepare(ACPI_STATE_S4);
	270	if (error)
	271	return error;
	272
	273	if (!ACPI_SUCCESS(acpi_hw_disable_all_gpes()))
	274	error = -EFAULT;
	275
	276	return error;
a3d25c27 RW	277	}
	278
	279	static int acpi_hibernation_enter(void)
	280	{
	281	acpi_status status = AE_OK;
	282	unsigned long flags = 0;
	283
	284	ACPI_FLUSH_CPU_CACHE();
	285
	286	local_irq_save(flags);
	287	acpi_enable_wakeup_device(ACPI_STATE_S4);
	288	/* This shouldn't return. If it returns, we have a problem */
	289	status = acpi_enter_sleep_state(ACPI_STATE_S4);
c95d47a8 RW	290	/* Reprogram control registers and execute _BFS */
c95d47a8 RW	291	acpi_leave_sleep_state_prep(ACPI_STATE_S4);
a3d25c27 RW	292	local_irq_restore(flags);
	293
	294	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
	295	}
	296
c7e0831d RW	297	static void acpi_hibernation_leave(void)
	298	{
	299	/*
	300	* If ACPI is not enabled by the BIOS and the boot kernel, we need to
	301	* enable it here.
	302	*/
	303	acpi_enable();
c95d47a8 RW	304	/* Reprogram control registers and execute _BFS */
c95d47a8 RW	305	acpi_leave_sleep_state_prep(ACPI_STATE_S4);
c7e0831d RW	306	}
c7e0831d RW	307
a3d25c27 RW	308	static void acpi_hibernation_finish(void)
a3d25c27 RW	309	{
a3d25c27	310	acpi_disable_wakeup_device(ACPI_STATE_S4);
1dbc1fda	311	acpi_leave_sleep_state(ACPI_STATE_S4);
a3d25c27 RW	312
	313	/* reset firmware waking vector */
	314	acpi_set_firmware_waking_vector((acpi_physical_address) 0);
74f270af RW	315
74f270af RW	316	acpi_target_sleep_state = ACPI_STATE_S0;
a3d25c27 RW	317	}
a3d25c27 RW	318
a634cc10 RW	319	static int acpi_hibernation_pre_restore(void)
	320	{
	321	acpi_status status;
	322
	323	status = acpi_hw_disable_all_gpes();
	324
	325	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
	326	}
	327
	328	static void acpi_hibernation_restore_cleanup(void)
	329	{
	330	acpi_hw_enable_all_runtime_gpes();
	331	}
	332
b3dac3b3	333	static struct platform_hibernation_ops acpi_hibernation_ops = {
74f270af RW	334	.start = acpi_hibernation_start,
	335	.pre_snapshot = acpi_hibernation_prepare,
	336	.finish = acpi_hibernation_finish,
a3d25c27 RW	337	.prepare = acpi_hibernation_prepare,
a3d25c27 RW	338	.enter = acpi_hibernation_enter,
c7e0831d	339	.leave = acpi_hibernation_leave,
a634cc10 RW	340	.pre_restore = acpi_hibernation_pre_restore,
a634cc10 RW	341	.restore_cleanup = acpi_hibernation_restore_cleanup,
a3d25c27	342	};
b0cb1a19	343	#endif /* CONFIG_HIBERNATION */
a3d25c27	344
296699de RW	345	int acpi_suspend(u32 acpi_state)
	346	{
	347	suspend_state_t states[] = {
	348	[1] = PM_SUSPEND_STANDBY,
	349	[3] = PM_SUSPEND_MEM,
	350	[5] = PM_SUSPEND_MAX
	351	};
	352
	353	if (acpi_state < 6 && states[acpi_state])
	354	return pm_suspend(states[acpi_state]);
	355	if (acpi_state == 4)
	356	return hibernate();
	357	return -EINVAL;
	358	}
	359
853298bc	360	#ifdef CONFIG_PM_SLEEP
fd4aff1a SL	361	/**
	362	* acpi_pm_device_sleep_state - return preferred power state of ACPI device
	363	* in the system sleep state given by %acpi_target_sleep_state
	364	* @dev: device to examine
	365	* @wake: if set, the device should be able to wake up the system
	366	* @d_min_p: used to store the upper limit of allowed states range
	367	* Return value: preferred power state of the device on success, -ENODEV on
	368	* failure (ie. if there's no 'struct acpi_device' for @dev)
	369	*
	370	* Find the lowest power (highest number) ACPI device power state that
	371	* device @dev can be in while the system is in the sleep state represented
	372	* by %acpi_target_sleep_state. If @wake is nonzero, the device should be
	373	* able to wake up the system from this sleep state. If @d_min_p is set,
	374	* the highest power (lowest number) device power state of @dev allowed
	375	* in this system sleep state is stored at the location pointed to by it.
	376	*
	377	* The caller must ensure that @dev is valid before using this function.
	378	* The caller is also responsible for figuring out if the device is
	379	* supposed to be able to wake up the system and passing this information
	380	* via @wake.
	381	*/
	382
	383	int acpi_pm_device_sleep_state(struct device dev, int wake, int d_min_p)
	384	{
	385	acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
	386	struct acpi_device *adev;
	387	char acpi_method[] = "_SxD";
	388	unsigned long d_min, d_max;
	389
	390	if (!handle \|\| ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
ead77594	391	printk(KERN_DEBUG "ACPI handle has no context!\n");
fd4aff1a SL	392	return -ENODEV;
	393	}
	394
	395	acpi_method[2] = '0' + acpi_target_sleep_state;
	396	/*
	397	* If the sleep state is S0, we will return D3, but if the device has
	398	* _S0W, we will use the value from _S0W
	399	*/
	400	d_min = ACPI_STATE_D0;
	401	d_max = ACPI_STATE_D3;
	402
	403	/*
	404	* If present, _SxD methods return the minimum D-state (highest power
	405	* state) we can use for the corresponding S-states. Otherwise, the
	406	* minimum D-state is D0 (ACPI 3.x).
	407	*
	408	* NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
	409	* provided -- that's our fault recovery, we ignore retval.
	410	*/
	411	if (acpi_target_sleep_state > ACPI_STATE_S0)
	412	acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
	413
	414	/*
	415	* If _PRW says we can wake up the system from the target sleep state,
	416	* the D-state returned by _SxD is sufficient for that (we assume a
	417	* wakeup-aware driver if wake is set). Still, if _SxW exists
	418	* (ACPI 3.x), it should return the maximum (lowest power) D-state that
	419	* can wake the system. _S0W may be valid, too.
	420	*/
	421	if (acpi_target_sleep_state == ACPI_STATE_S0 \|\|
	422	(wake && adev->wakeup.state.enabled &&
	423	adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
	424	acpi_method[3] = 'W';
	425	acpi_evaluate_integer(handle, acpi_method, NULL, &d_max);
	426	/* Sanity check */
	427	if (d_max < d_min)
	428	d_min = d_max;
	429	}
	430
	431	if (d_min_p)
	432	*d_min_p = d_min;
	433	return d_max;
	434	}
853298bc	435	#endif
fd4aff1a	436
f216cc37 AS	437	static void acpi_power_off_prepare(void)
	438	{
	439	/* Prepare to power off the system */
	440	acpi_sleep_prepare(ACPI_STATE_S5);
3c1d2b60	441	acpi_hw_disable_all_gpes();
f216cc37 AS	442	}
	443
	444	static void acpi_power_off(void)
	445	{
	446	/* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
	447	printk("%s called\n", __FUNCTION__);
	448	local_irq_disable();
9c1c6a1b	449	acpi_enable_wakeup_device(ACPI_STATE_S5);
f216cc37 AS	450	acpi_enter_sleep_state(ACPI_STATE_S5);
	451	}
	452
aafbcd16	453	int __init acpi_sleep_init(void)
1da177e4	454	{
296699de RW	455	acpi_status status;
	456	u8 type_a, type_b;
	457	#ifdef CONFIG_SUSPEND
e2a5b420	458	int i = 0;
1da177e4 LT	459
1da177e4 LT	460	dmi_check_system(acpisleep_dmi_table);
296699de	461	#endif
1da177e4 LT	462
	463	if (acpi_disabled)
	464	return 0;
	465
5a50fe70 FP	466	sleep_states[ACPI_STATE_S0] = 1;
	467	printk(KERN_INFO PREFIX "(supports S0");
	468
296699de	469	#ifdef CONFIG_SUSPEND
5a50fe70	470	for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
1da177e4 LT	471	status = acpi_get_sleep_type_data(i, &type_a, &type_b);
	472	if (ACPI_SUCCESS(status)) {
	473	sleep_states[i] = 1;
	474	printk(" S%d", i);
	475	}
1da177e4	476	}
1da177e4	477
26398a70	478	suspend_set_ops(&acpi_pm_ops);
296699de	479	#endif
a3d25c27	480
b0cb1a19	481	#ifdef CONFIG_HIBERNATION
296699de RW	482	status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
296699de RW	483	if (ACPI_SUCCESS(status)) {
a3d25c27	484	hibernation_set_ops(&acpi_hibernation_ops);
296699de	485	sleep_states[ACPI_STATE_S4] = 1;
f216cc37	486	printk(" S4");
296699de	487	}
a3d25c27	488	#endif
f216cc37 AS	489	status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
	490	if (ACPI_SUCCESS(status)) {
	491	sleep_states[ACPI_STATE_S5] = 1;
	492	printk(" S5");
	493	pm_power_off_prepare = acpi_power_off_prepare;
	494	pm_power_off = acpi_power_off;
	495	}
	496	printk(")\n");
1da177e4 LT	497	return 0;
1da177e4 LT	498	}