[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / power / suspend.c

/*
 * kernel/power/suspend.c - Suspend to RAM and standby functionality.
 *
 * Copyright (c) 2003 Patrick Mochel
 * Copyright (c) 2003 Open Source Development Lab
 * Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
 *
 * This file is released under the GPLv2.
 */

#include <linux/string.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/syscalls.h>
#include <linux/gfp.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/suspend.h>
#include <linux/syscore_ops.h>
#include <linux/ftrace.h>
#include <trace/events/power.h>

#include "power.h"

const char *const pm_states[PM_SUSPEND_MAX] = {
	[PM_SUSPEND_FREEZE]	= "freeze",
	[PM_SUSPEND_STANDBY]	= "standby",
	[PM_SUSPEND_MEM]	= "mem",
};

static const struct platform_suspend_ops *suspend_ops;

static bool need_suspend_ops(suspend_state_t state)
{
	return !!(state > PM_SUSPEND_FREEZE);
}

static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head);
static bool suspend_freeze_wake;

static void freeze_begin(void)
{
	suspend_freeze_wake = false;
}

static void freeze_enter(void)
{
	wait_event(suspend_freeze_wait_head, suspend_freeze_wake);
}

void freeze_wake(void)
{
	suspend_freeze_wake = true;
	wake_up(&suspend_freeze_wait_head);
}
EXPORT_SYMBOL_GPL(freeze_wake);

/**
 * suspend_set_ops - Set the global suspend method table.
 * @ops: Suspend operations to use.
 */
void suspend_set_ops(const struct platform_suspend_ops *ops)
{
	lock_system_sleep();
	suspend_ops = ops;
	unlock_system_sleep();
}
EXPORT_SYMBOL_GPL(suspend_set_ops);

bool valid_state(suspend_state_t state)
{
	if (state == PM_SUSPEND_FREEZE)
		return true;
	/*
	 * PM_SUSPEND_STANDBY and PM_SUSPEND_MEMORY states need lowlevel
	 * support and need to be valid to the lowlevel
	 * implementation, no valid callback implies that none are valid.
	 */
	return suspend_ops && suspend_ops->valid && suspend_ops->valid(state);
}

/**
 * suspend_valid_only_mem - Generic memory-only valid callback.
 *
 * Platform drivers that implement mem suspend only and only need to check for
 * that in their .valid() callback can use this instead of rolling their own
 * .valid() callback.
 */
int suspend_valid_only_mem(suspend_state_t state)
{
	return state == PM_SUSPEND_MEM;
}
EXPORT_SYMBOL_GPL(suspend_valid_only_mem);

static int suspend_test(int level)
{
#ifdef CONFIG_PM_DEBUG
	if (pm_test_level == level) {
		printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
		mdelay(5000);
		return 1;
	}
#endif /* !CONFIG_PM_DEBUG */
	return 0;
}

/**
 * suspend_prepare - Prepare for entering system sleep state.
 *
 * Common code run for every system sleep state that can be entered (except for
 * hibernation).  Run suspend notifiers, allocate the "suspend" console and
 * freeze processes.
 */
static int suspend_prepare(suspend_state_t state)
{
	int error;

	if (need_suspend_ops(state) && (!suspend_ops || !suspend_ops->enter))
		return -EPERM;

	pm_prepare_console();

	error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
	if (error)
		goto Finish;

	error = suspend_freeze_processes();
	if (!error)
		return 0;

	suspend_stats.failed_freeze++;
	dpm_save_failed_step(SUSPEND_FREEZE);
 Finish:
	pm_notifier_call_chain(PM_POST_SUSPEND);
	pm_restore_console();
	return error;
}

/* default implementation */
void __attribute__ ((weak)) arch_suspend_disable_irqs(void)
{
	local_irq_disable();
}

/* default implementation */
void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
{
	local_irq_enable();
}

/**
 * suspend_enter - Make the system enter the given sleep state.
 * @state: System sleep state to enter.
 * @wakeup: Returns information that the sleep state should not be re-entered.
 *
 * This function should be called after devices have been suspended.
 */
static int suspend_enter(suspend_state_t state, bool *wakeup)
{
	int error;

	if (need_suspend_ops(state) && suspend_ops->prepare) {
		error = suspend_ops->prepare();
		if (error)
			goto Platform_finish;
	}

	error = dpm_suspend_end(PMSG_SUSPEND);
	if (error) {
		printk(KERN_ERR "PM: Some devices failed to power down\n");
		goto Platform_finish;
	}

	if (need_suspend_ops(state) && suspend_ops->prepare_late) {
		error = suspend_ops->prepare_late();
		if (error)
			goto Platform_wake;
	}

	if (suspend_test(TEST_PLATFORM))
		goto Platform_wake;

	/*
	 * PM_SUSPEND_FREEZE equals
	 * frozen processes + suspended devices + idle processors.
	 * Thus we should invoke freeze_enter() soon after
	 * all the devices are suspended.
	 */
	if (state == PM_SUSPEND_FREEZE) {
		freeze_enter();
		goto Platform_wake;
	}

	error = disable_nonboot_cpus();
	if (error || suspend_test(TEST_CPUS))
		goto Enable_cpus;

	arch_suspend_disable_irqs();
	BUG_ON(!irqs_disabled());

	error = syscore_suspend();
	if (!error) {
		*wakeup = pm_wakeup_pending();
		if (!(suspend_test(TEST_CORE) || *wakeup)) {
			error = suspend_ops->enter(state);
			events_check_enabled = false;
		}
		syscore_resume();
	}

	arch_suspend_enable_irqs();
	BUG_ON(irqs_disabled());

 Enable_cpus:
	enable_nonboot_cpus();

 Platform_wake:
	if (need_suspend_ops(state) && suspend_ops->wake)
		suspend_ops->wake();

	dpm_resume_start(PMSG_RESUME);

 Platform_finish:
	if (need_suspend_ops(state) && suspend_ops->finish)
		suspend_ops->finish();

	return error;
}

/**
 * suspend_devices_and_enter - Suspend devices and enter system sleep state.
 * @state: System sleep state to enter.
 */
int suspend_devices_and_enter(suspend_state_t state)
{
	int error;
	bool wakeup = false;

	if (need_suspend_ops(state) && !suspend_ops)
		return -ENOSYS;

	trace_machine_suspend(state);
	if (need_suspend_ops(state) && suspend_ops->begin) {
		error = suspend_ops->begin(state);
		if (error)
			goto Close;
	}
	suspend_console();
	ftrace_stop();
	suspend_test_start();
	error = dpm_suspend_start(PMSG_SUSPEND);
	if (error) {
		printk(KERN_ERR "PM: Some devices failed to suspend\n");
		goto Recover_platform;
	}
	suspend_test_finish("suspend devices");
	if (suspend_test(TEST_DEVICES))
		goto Recover_platform;

	do {
		error = suspend_enter(state, &wakeup);
	} while (!error && !wakeup && need_suspend_ops(state)
		&& suspend_ops->suspend_again && suspend_ops->suspend_again());

 Resume_devices:
	suspend_test_start();
	dpm_resume_end(PMSG_RESUME);
	suspend_test_finish("resume devices");
	ftrace_start();
	resume_console();
 Close:
	if (need_suspend_ops(state) && suspend_ops->end)
		suspend_ops->end();
	trace_machine_suspend(PWR_EVENT_EXIT);
	return error;

 Recover_platform:
	if (need_suspend_ops(state) && suspend_ops->recover)
		suspend_ops->recover();
	goto Resume_devices;
}

/**
 * suspend_finish - Clean up before finishing the suspend sequence.
 *
 * Call platform code to clean up, restart processes, and free the console that
 * we've allocated. This routine is not called for hibernation.
 */
static void suspend_finish(void)
{
	suspend_thaw_processes();
	pm_notifier_call_chain(PM_POST_SUSPEND);
	pm_restore_console();
}

/**
 * enter_state - Do common work needed to enter system sleep state.
 * @state: System sleep state to enter.
 *
 * Make sure that no one else is trying to put the system into a sleep state.
 * Fail if that's not the case.  Otherwise, prepare for system suspend, make the
 * system enter the given sleep state and clean up after wakeup.
 */
static int enter_state(suspend_state_t state)
{
	int error;

	if (!valid_state(state))
		return -ENODEV;

	if (!mutex_trylock(&pm_mutex))
		return -EBUSY;

	if (state == PM_SUSPEND_FREEZE)
		freeze_begin();

	printk(KERN_INFO "PM: Syncing filesystems ... ");
	sys_sync();
	printk("done.\n");

	pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
	error = suspend_prepare(state);
	if (error)
		goto Unlock;

	if (suspend_test(TEST_FREEZER))
		goto Finish;

	pr_debug("PM: Entering %s sleep\n", pm_states[state]);
	pm_restrict_gfp_mask();
	error = suspend_devices_and_enter(state);
	pm_restore_gfp_mask();

 Finish:
	pr_debug("PM: Finishing wakeup.\n");
	suspend_finish();
 Unlock:
	mutex_unlock(&pm_mutex);
	return error;
}

/**
 * pm_suspend - Externally visible function for suspending the system.
 * @state: System sleep state to enter.
 *
 * Check if the value of @state represents one of the supported states,
 * execute enter_state() and update system suspend statistics.
 */
int pm_suspend(suspend_state_t state)
{
	int error;

	if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX)
		return -EINVAL;

	error = enter_state(state);
	if (error) {
		suspend_stats.fail++;
		dpm_save_failed_errno(error);
	} else {
		suspend_stats.success++;
	}
	return error;
}
EXPORT_SYMBOL(pm_suspend);
Commit	Line	Data
a9d70523 RW	1	/*
	2	* kernel/power/suspend.c - Suspend to RAM and standby functionality.
	3	*
	4	* Copyright (c) 2003 Patrick Mochel
	5	* Copyright (c) 2003 Open Source Development Lab
	6	* Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
	7	*
	8	* This file is released under the GPLv2.
	9	*/
	10
	11	#include <linux/string.h>
	12	#include <linux/delay.h>
	13	#include <linux/errno.h>
	14	#include <linux/init.h>
	15	#include <linux/console.h>
	16	#include <linux/cpu.h>
	17	#include <linux/syscalls.h>
5a0e3ad6	18	#include <linux/gfp.h>
dd4c4f17 MG	19	#include <linux/io.h>
	20	#include <linux/kernel.h>
	21	#include <linux/list.h>
	22	#include <linux/mm.h>
	23	#include <linux/slab.h>
6e5fdeed	24	#include <linux/export.h>
dd4c4f17	25	#include <linux/suspend.h>
40dc166c	26	#include <linux/syscore_ops.h>
443772d4	27	#include <linux/ftrace.h>
938cfed1	28	#include <trace/events/power.h>
a9d70523 RW	29
	30	#include "power.h"
	31
	32	const char *const pm_states[PM_SUSPEND_MAX] = {
7e73c5ae	33	[PM_SUSPEND_FREEZE] = "freeze",
a9d70523 RW	34	[PM_SUSPEND_STANDBY] = "standby",
	35	[PM_SUSPEND_MEM] = "mem",
	36	};
	37
2f55ac07	38	static const struct platform_suspend_ops *suspend_ops;
a9d70523	39
7e73c5ae ZR	40	static bool need_suspend_ops(suspend_state_t state)
	41	{
	42	return !!(state > PM_SUSPEND_FREEZE);
	43	}
	44
	45	static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head);
	46	static bool suspend_freeze_wake;
	47
	48	static void freeze_begin(void)
	49	{
	50	suspend_freeze_wake = false;
	51	}
	52
	53	static void freeze_enter(void)
	54	{
	55	wait_event(suspend_freeze_wait_head, suspend_freeze_wake);
	56	}
	57
	58	void freeze_wake(void)
	59	{
	60	suspend_freeze_wake = true;
	61	wake_up(&suspend_freeze_wait_head);
	62	}
	63	EXPORT_SYMBOL_GPL(freeze_wake);
	64
a9d70523	65	/**
55ae4519 RW	66	* suspend_set_ops - Set the global suspend method table.
55ae4519 RW	67	* @ops: Suspend operations to use.
a9d70523	68	*/
2f55ac07	69	void suspend_set_ops(const struct platform_suspend_ops *ops)
a9d70523	70	{
bcda53fa	71	lock_system_sleep();
a9d70523	72	suspend_ops = ops;
bcda53fa	73	unlock_system_sleep();
a9d70523	74	}
a5e4fd87	75	EXPORT_SYMBOL_GPL(suspend_set_ops);
a9d70523 RW	76
	77	bool valid_state(suspend_state_t state)
	78	{
7e73c5ae ZR	79	if (state == PM_SUSPEND_FREEZE)
7e73c5ae ZR	80	return true;
a9d70523	81	/*
7e73c5ae ZR	82	* PM_SUSPEND_STANDBY and PM_SUSPEND_MEMORY states need lowlevel
7e73c5ae ZR	83	* support and need to be valid to the lowlevel
a9d70523 RW	84	* implementation, no valid callback implies that none are valid.
	85	*/
	86	return suspend_ops && suspend_ops->valid && suspend_ops->valid(state);
	87	}
	88
	89	/**
55ae4519	90	* suspend_valid_only_mem - Generic memory-only valid callback.
a9d70523	91	*
55ae4519 RW	92	* Platform drivers that implement mem suspend only and only need to check for
	93	* that in their .valid() callback can use this instead of rolling their own
	94	* .valid() callback.
a9d70523 RW	95	*/
	96	int suspend_valid_only_mem(suspend_state_t state)
	97	{
	98	return state == PM_SUSPEND_MEM;
	99	}
a5e4fd87	100	EXPORT_SYMBOL_GPL(suspend_valid_only_mem);
a9d70523 RW	101
	102	static int suspend_test(int level)
	103	{
	104	#ifdef CONFIG_PM_DEBUG
	105	if (pm_test_level == level) {
	106	printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
	107	mdelay(5000);
	108	return 1;
	109	}
	110	#endif /* !CONFIG_PM_DEBUG */
	111	return 0;
	112	}
	113
	114	/**
55ae4519	115	* suspend_prepare - Prepare for entering system sleep state.
a9d70523	116	*
55ae4519 RW	117	* Common code run for every system sleep state that can be entered (except for
	118	* hibernation). Run suspend notifiers, allocate the "suspend" console and
	119	* freeze processes.
a9d70523	120	*/
7e73c5ae	121	static int suspend_prepare(suspend_state_t state)
a9d70523 RW	122	{
	123	int error;
	124
7e73c5ae	125	if (need_suspend_ops(state) && (!suspend_ops \|\| !suspend_ops->enter))
a9d70523 RW	126	return -EPERM;
	127
	128	pm_prepare_console();
	129
	130	error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
	131	if (error)
	132	goto Finish;
	133
a9d70523	134	error = suspend_freeze_processes();
03afed8b	135	if (!error)
a9d70523 RW	136	return 0;
a9d70523 RW	137
03afed8b TH	138	suspend_stats.failed_freeze++;
03afed8b TH	139	dpm_save_failed_step(SUSPEND_FREEZE);
a9d70523 RW	140	Finish:
	141	pm_notifier_call_chain(PM_POST_SUSPEND);
	142	pm_restore_console();
	143	return error;
	144	}
	145
	146	/* default implementation */
	147	void __attribute__ ((weak)) arch_suspend_disable_irqs(void)
	148	{
	149	local_irq_disable();
	150	}
	151
	152	/* default implementation */
	153	void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
	154	{
	155	local_irq_enable();
	156	}
	157
	158	/**
55ae4519 RW	159	* suspend_enter - Make the system enter the given sleep state.
	160	* @state: System sleep state to enter.
	161	* @wakeup: Returns information that the sleep state should not be re-entered.
a9d70523	162	*
3b5fe852	163	* This function should be called after devices have been suspended.
a9d70523	164	*/
3b5fe852	165	static int suspend_enter(suspend_state_t state, bool *wakeup)
a9d70523 RW	166	{
	167	int error;
	168
7e73c5ae	169	if (need_suspend_ops(state) && suspend_ops->prepare) {
a9d70523 RW	170	error = suspend_ops->prepare();
a9d70523 RW	171	if (error)
ce441011	172	goto Platform_finish;
a9d70523 RW	173	}
a9d70523 RW	174
cf579dfb	175	error = dpm_suspend_end(PMSG_SUSPEND);
a9d70523 RW	176	if (error) {
a9d70523 RW	177	printk(KERN_ERR "PM: Some devices failed to power down\n");
ce441011	178	goto Platform_finish;
a9d70523 RW	179	}
a9d70523 RW	180
7e73c5ae	181	if (need_suspend_ops(state) && suspend_ops->prepare_late) {
a9d70523 RW	182	error = suspend_ops->prepare_late();
a9d70523 RW	183	if (error)
ce441011	184	goto Platform_wake;
a9d70523 RW	185	}
a9d70523 RW	186
08605acc ZR	187	if (suspend_test(TEST_PLATFORM))
	188	goto Platform_wake;
	189
7e73c5ae ZR	190	/*
	191	* PM_SUSPEND_FREEZE equals
	192	* frozen processes + suspended devices + idle processors.
	193	* Thus we should invoke freeze_enter() soon after
	194	* all the devices are suspended.
	195	*/
	196	if (state == PM_SUSPEND_FREEZE) {
	197	freeze_enter();
	198	goto Platform_wake;
	199	}
	200
a9d70523 RW	201	error = disable_nonboot_cpus();
	202	if (error \|\| suspend_test(TEST_CPUS))
	203	goto Enable_cpus;
	204
	205	arch_suspend_disable_irqs();
	206	BUG_ON(!irqs_disabled());
	207
2e711c04	208	error = syscore_suspend();
a9d70523	209	if (!error) {
3b5fe852 MH	210	*wakeup = pm_wakeup_pending();
3b5fe852 MH	211	if (!(suspend_test(TEST_CORE) \|\| *wakeup)) {
a9d70523	212	error = suspend_ops->enter(state);
c125e96f RW	213	events_check_enabled = false;
c125e96f RW	214	}
40dc166c	215	syscore_resume();
a9d70523 RW	216	}
	217
	218	arch_suspend_enable_irqs();
	219	BUG_ON(irqs_disabled());
	220
	221	Enable_cpus:
	222	enable_nonboot_cpus();
	223
	224	Platform_wake:
7e73c5ae	225	if (need_suspend_ops(state) && suspend_ops->wake)
a9d70523 RW	226	suspend_ops->wake();
a9d70523 RW	227
cf579dfb	228	dpm_resume_start(PMSG_RESUME);
a9d70523	229
ce441011	230	Platform_finish:
7e73c5ae	231	if (need_suspend_ops(state) && suspend_ops->finish)
a9d70523 RW	232	suspend_ops->finish();
	233
	234	return error;
	235	}
	236
	237	/**
55ae4519 RW	238	* suspend_devices_and_enter - Suspend devices and enter system sleep state.
55ae4519 RW	239	* @state: System sleep state to enter.
a9d70523 RW	240	*/
	241	int suspend_devices_and_enter(suspend_state_t state)
	242	{
	243	int error;
3b5fe852	244	bool wakeup = false;
a9d70523	245
7e73c5ae	246	if (need_suspend_ops(state) && !suspend_ops)
a9d70523 RW	247	return -ENOSYS;
a9d70523 RW	248
938cfed1	249	trace_machine_suspend(state);
7e73c5ae	250	if (need_suspend_ops(state) && suspend_ops->begin) {
a9d70523 RW	251	error = suspend_ops->begin(state);
	252	if (error)
	253	goto Close;
	254	}
	255	suspend_console();
443772d4	256	ftrace_stop();
a9d70523 RW	257	suspend_test_start();
	258	error = dpm_suspend_start(PMSG_SUSPEND);
	259	if (error) {
	260	printk(KERN_ERR "PM: Some devices failed to suspend\n");
	261	goto Recover_platform;
	262	}
	263	suspend_test_finish("suspend devices");
	264	if (suspend_test(TEST_DEVICES))
	265	goto Recover_platform;
	266
3b5fe852 MH	267	do {
3b5fe852 MH	268	error = suspend_enter(state, &wakeup);
7e73c5ae	269	} while (!error && !wakeup && need_suspend_ops(state)
3b5fe852	270	&& suspend_ops->suspend_again && suspend_ops->suspend_again());
a9d70523 RW	271
	272	Resume_devices:
	273	suspend_test_start();
	274	dpm_resume_end(PMSG_RESUME);
	275	suspend_test_finish("resume devices");
443772d4	276	ftrace_start();
a9d70523 RW	277	resume_console();
a9d70523 RW	278	Close:
7e73c5ae	279	if (need_suspend_ops(state) && suspend_ops->end)
a9d70523	280	suspend_ops->end();
938cfed1	281	trace_machine_suspend(PWR_EVENT_EXIT);
a9d70523 RW	282	return error;
	283
	284	Recover_platform:
7e73c5ae	285	if (need_suspend_ops(state) && suspend_ops->recover)
a9d70523 RW	286	suspend_ops->recover();
	287	goto Resume_devices;
	288	}
	289
	290	/**
55ae4519	291	* suspend_finish - Clean up before finishing the suspend sequence.
a9d70523	292	*
55ae4519 RW	293	* Call platform code to clean up, restart processes, and free the console that
55ae4519 RW	294	* we've allocated. This routine is not called for hibernation.
a9d70523 RW	295	*/
	296	static void suspend_finish(void)
	297	{
	298	suspend_thaw_processes();
a9d70523 RW	299	pm_notifier_call_chain(PM_POST_SUSPEND);
	300	pm_restore_console();
	301	}
	302
	303	/**
55ae4519 RW	304	* enter_state - Do common work needed to enter system sleep state.
55ae4519 RW	305	* @state: System sleep state to enter.
a9d70523	306	*
55ae4519 RW	307	* Make sure that no one else is trying to put the system into a sleep state.
	308	* Fail if that's not the case. Otherwise, prepare for system suspend, make the
	309	* system enter the given sleep state and clean up after wakeup.
a9d70523	310	*/
93e1ee43	311	static int enter_state(suspend_state_t state)
a9d70523 RW	312	{
	313	int error;
	314
	315	if (!valid_state(state))
	316	return -ENODEV;
	317
	318	if (!mutex_trylock(&pm_mutex))
	319	return -EBUSY;
	320
7e73c5ae ZR	321	if (state == PM_SUSPEND_FREEZE)
	322	freeze_begin();
	323
a9d70523 RW	324	printk(KERN_INFO "PM: Syncing filesystems ... ");
	325	sys_sync();
	326	printk("done.\n");
	327
	328	pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
7e73c5ae	329	error = suspend_prepare(state);
a9d70523 RW	330	if (error)
	331	goto Unlock;
	332
	333	if (suspend_test(TEST_FREEZER))
	334	goto Finish;
	335
	336	pr_debug("PM: Entering %s sleep\n", pm_states[state]);
87186475	337	pm_restrict_gfp_mask();
a9d70523	338	error = suspend_devices_and_enter(state);
87186475	339	pm_restore_gfp_mask();
a9d70523 RW	340
	341	Finish:
	342	pr_debug("PM: Finishing wakeup.\n");
	343	suspend_finish();
	344	Unlock:
	345	mutex_unlock(&pm_mutex);
	346	return error;
	347	}
	348
	349	/**
55ae4519 RW	350	* pm_suspend - Externally visible function for suspending the system.
55ae4519 RW	351	* @state: System sleep state to enter.
a9d70523	352	*
55ae4519 RW	353	* Check if the value of @state represents one of the supported states,
55ae4519 RW	354	* execute enter_state() and update system suspend statistics.
a9d70523 RW	355	*/
	356	int pm_suspend(suspend_state_t state)
	357	{
bc25cf50 RW	358	int error;
	359
	360	if (state <= PM_SUSPEND_ON \|\| state >= PM_SUSPEND_MAX)
	361	return -EINVAL;
	362
	363	error = enter_state(state);
	364	if (error) {
	365	suspend_stats.fail++;
	366	dpm_save_failed_errno(error);
	367	} else {
	368	suspend_stats.success++;
2a77c46d	369	}
bc25cf50	370	return error;
a9d70523 RW	371	}
a9d70523 RW	372	EXPORT_SYMBOL(pm_suspend);