[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 <linux/rtc.h>
#include <trace/events/power.h>

#include "power.h"

struct pm_sleep_state pm_states[PM_SUSPEND_MAX] = {
#ifdef CONFIG_EARLYSUSPEND
	[PM_SUSPEND_ON]		= { .label = "on", },
#endif
	[PM_SUSPEND_FREEZE] = { .label = "freeze", .state = PM_SUSPEND_FREEZE },
	[PM_SUSPEND_STANDBY] = { .label = "standby", },
	[PM_SUSPEND_MEM] = { .label = "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);

bool valid_state(suspend_state_t state)
{
	/*
	 * PM_SUSPEND_STANDBY and PM_SUSPEND_MEM states need low level
	 * support and need to be valid to the low level
	 * implementation, no valid callback implies that none are valid.
	 */
	return suspend_ops && suspend_ops->valid && suspend_ops->valid(state);
}

/**
 * suspend_set_ops - Set the global suspend method table.
 * @ops: Suspend operations to use.
 */
void suspend_set_ops(const struct platform_suspend_ops *ops)
{
	suspend_state_t i;

	lock_system_sleep();

	suspend_ops = ops;
	for (i = PM_SUSPEND_STANDBY; i <= PM_SUSPEND_MEM; i++)
		pm_states[i].state = valid_state(i) ? i : 0;

	unlock_system_sleep();
}
EXPORT_SYMBOL_GPL(suspend_set_ops);

/**
 * 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;

#ifdef CONFIG_TOI
	drop_pagecache();
#endif 

	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;
}
EXPORT_SYMBOL_GPL(suspend_devices_and_enter);

/**
 * 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.
 */
//<20130327> <marc.huang> merge from android kernel 3.0 - modify enter_state function to non-static
int enter_state(suspend_state_t state)
{
	int error;

	if (state == PM_SUSPEND_FREEZE) {
#ifdef CONFIG_PM_DEBUG
		if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) {
			pr_warning("PM: Unsupported test mode for freeze state,"
				   "please choose none/freezer/devices/platform.\n");
			return -EAGAIN;
		}
#endif
	} else if (!valid_state(state)) {
		return -EINVAL;
	}
	if (!mutex_trylock(&pm_mutex))
		return -EBUSY;

	if (state == PM_SUSPEND_FREEZE)
		freeze_begin();

	printk(KERN_INFO "PM: Syncing filesystems ... ");
	#if 1
	sys_sync();
	#else /* sys_sync WQ ver2.0 use */
    //[MTK]
    suspend_syssync_enqueue();
    suspend_check_sys_sync_done();
  #endif
	printk("done.\n");

	pr_debug("PM: Preparing system for %s sleep\n", pm_states[state].label);
	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].label);
	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;
}

static void pm_suspend_marker(char *annotation)
{
	struct timespec ts;
	struct rtc_time tm;

	getnstimeofday(&ts);
	rtc_time_to_tm(ts.tv_sec, &tm);
	pr_info("PM: suspend %s %d-%02d-%02d %02d:%02d:%02d.%09lu UTC\n",
		annotation, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
		tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec);
}

/**
 * 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;

	pm_suspend_marker("entry");
	error = enter_state(state);
	if (error) {
		suspend_stats.fail++;
		dpm_save_failed_errno(error);
	} else {
		suspend_stats.success++;
	}
	pm_suspend_marker("exit");
	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>
6fa3eb70	28	#include <linux/rtc.h>
938cfed1	29	#include <trace/events/power.h>
a9d70523 RW	30
	31	#include "power.h"
	32
e89547b8	33	struct pm_sleep_state pm_states[PM_SUSPEND_MAX] = {
6fa3eb70	34	#ifdef CONFIG_EARLYSUSPEND
f29ec40f	35	[PM_SUSPEND_ON] = { .label = "on", },
6fa3eb70	36	#endif
5c95fef6 RW	37	[PM_SUSPEND_FREEZE] = { .label = "freeze", .state = PM_SUSPEND_FREEZE },
	38	[PM_SUSPEND_STANDBY] = { .label = "standby", },
	39	[PM_SUSPEND_MEM] = { .label = "mem", },
a9d70523 RW	40	};
a9d70523 RW	41
2f55ac07	42	static const struct platform_suspend_ops *suspend_ops;
a9d70523	43
7e73c5ae ZR	44	static bool need_suspend_ops(suspend_state_t state)
	45	{
	46	return !!(state > PM_SUSPEND_FREEZE);
	47	}
	48
	49	static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head);
	50	static bool suspend_freeze_wake;
	51
	52	static void freeze_begin(void)
	53	{
	54	suspend_freeze_wake = false;
	55	}
	56
	57	static void freeze_enter(void)
	58	{
	59	wait_event(suspend_freeze_wait_head, suspend_freeze_wake);
	60	}
	61
	62	void freeze_wake(void)
	63	{
	64	suspend_freeze_wake = true;
	65	wake_up(&suspend_freeze_wait_head);
	66	}
	67	EXPORT_SYMBOL_GPL(freeze_wake);
	68
9afc0d8b	69	bool valid_state(suspend_state_t state)
5c95fef6 RW	70	{
	71	/*
	72	* PM_SUSPEND_STANDBY and PM_SUSPEND_MEM states need low level
	73	* support and need to be valid to the low level
	74	* implementation, no valid callback implies that none are valid.
	75	*/
	76	return suspend_ops && suspend_ops->valid && suspend_ops->valid(state);
	77	}
	78
a9d70523	79	/**
55ae4519 RW	80	* suspend_set_ops - Set the global suspend method table.
55ae4519 RW	81	* @ops: Suspend operations to use.
a9d70523	82	*/
2f55ac07	83	void suspend_set_ops(const struct platform_suspend_ops *ops)
a9d70523	84	{
5c95fef6 RW	85	suspend_state_t i;
5c95fef6 RW	86
bcda53fa	87	lock_system_sleep();
5c95fef6	88
a9d70523	89	suspend_ops = ops;
5c95fef6 RW	90	for (i = PM_SUSPEND_STANDBY; i <= PM_SUSPEND_MEM; i++)
	91	pm_states[i].state = valid_state(i) ? i : 0;
	92
bcda53fa	93	unlock_system_sleep();
a9d70523	94	}
a5e4fd87	95	EXPORT_SYMBOL_GPL(suspend_set_ops);
a9d70523	96
a9d70523	97	/**
55ae4519	98	* suspend_valid_only_mem - Generic memory-only valid callback.
a9d70523	99	*
55ae4519 RW	100	* Platform drivers that implement mem suspend only and only need to check for
	101	* that in their .valid() callback can use this instead of rolling their own
	102	* .valid() callback.
a9d70523 RW	103	*/
	104	int suspend_valid_only_mem(suspend_state_t state)
	105	{
	106	return state == PM_SUSPEND_MEM;
	107	}
a5e4fd87	108	EXPORT_SYMBOL_GPL(suspend_valid_only_mem);
a9d70523 RW	109
	110	static int suspend_test(int level)
	111	{
	112	#ifdef CONFIG_PM_DEBUG
	113	if (pm_test_level == level) {
	114	printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
	115	mdelay(5000);
	116	return 1;
	117	}
	118	#endif /* !CONFIG_PM_DEBUG */
	119	return 0;
	120	}
	121
	122	/**
55ae4519	123	* suspend_prepare - Prepare for entering system sleep state.
a9d70523	124	*
55ae4519 RW	125	* Common code run for every system sleep state that can be entered (except for
	126	* hibernation). Run suspend notifiers, allocate the "suspend" console and
	127	* freeze processes.
a9d70523	128	*/
7e73c5ae	129	static int suspend_prepare(suspend_state_t state)
a9d70523 RW	130	{
	131	int error;
	132
7e73c5ae	133	if (need_suspend_ops(state) && (!suspend_ops \|\| !suspend_ops->enter))
a9d70523 RW	134	return -EPERM;
	135
	136	pm_prepare_console();
	137
	138	error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
	139	if (error)
	140	goto Finish;
	141
a9d70523	142	error = suspend_freeze_processes();
03afed8b	143	if (!error)
a9d70523 RW	144	return 0;
a9d70523 RW	145
03afed8b TH	146	suspend_stats.failed_freeze++;
03afed8b TH	147	dpm_save_failed_step(SUSPEND_FREEZE);
a9d70523 RW	148	Finish:
	149	pm_notifier_call_chain(PM_POST_SUSPEND);
	150	pm_restore_console();
	151	return error;
	152	}
	153
	154	/* default implementation */
	155	void __attribute__ ((weak)) arch_suspend_disable_irqs(void)
	156	{
	157	local_irq_disable();
	158	}
	159
	160	/* default implementation */
	161	void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
	162	{
	163	local_irq_enable();
	164	}
	165
	166	/**
55ae4519 RW	167	* suspend_enter - Make the system enter the given sleep state.
	168	* @state: System sleep state to enter.
	169	* @wakeup: Returns information that the sleep state should not be re-entered.
a9d70523	170	*
3b5fe852	171	* This function should be called after devices have been suspended.
a9d70523	172	*/
3b5fe852	173	static int suspend_enter(suspend_state_t state, bool *wakeup)
a9d70523 RW	174	{
	175	int error;
	176
7e73c5ae	177	if (need_suspend_ops(state) && suspend_ops->prepare) {
a9d70523 RW	178	error = suspend_ops->prepare();
a9d70523 RW	179	if (error)
ce441011	180	goto Platform_finish;
a9d70523 RW	181	}
a9d70523 RW	182
cf579dfb	183	error = dpm_suspend_end(PMSG_SUSPEND);
a9d70523 RW	184	if (error) {
a9d70523 RW	185	printk(KERN_ERR "PM: Some devices failed to power down\n");
ce441011	186	goto Platform_finish;
a9d70523 RW	187	}
a9d70523 RW	188
7e73c5ae	189	if (need_suspend_ops(state) && suspend_ops->prepare_late) {
a9d70523 RW	190	error = suspend_ops->prepare_late();
a9d70523 RW	191	if (error)
ce441011	192	goto Platform_wake;
a9d70523 RW	193	}
a9d70523 RW	194
08605acc ZR	195	if (suspend_test(TEST_PLATFORM))
	196	goto Platform_wake;
	197
7e73c5ae ZR	198	/*
	199	* PM_SUSPEND_FREEZE equals
	200	* frozen processes + suspended devices + idle processors.
	201	* Thus we should invoke freeze_enter() soon after
	202	* all the devices are suspended.
	203	*/
	204	if (state == PM_SUSPEND_FREEZE) {
	205	freeze_enter();
	206	goto Platform_wake;
	207	}
	208
a9d70523 RW	209	error = disable_nonboot_cpus();
	210	if (error \|\| suspend_test(TEST_CPUS))
	211	goto Enable_cpus;
	212
	213	arch_suspend_disable_irqs();
	214	BUG_ON(!irqs_disabled());
	215
2e711c04	216	error = syscore_suspend();
a9d70523	217	if (!error) {
3b5fe852 MH	218	*wakeup = pm_wakeup_pending();
3b5fe852 MH	219	if (!(suspend_test(TEST_CORE) \|\| *wakeup)) {
a9d70523	220	error = suspend_ops->enter(state);
c125e96f RW	221	events_check_enabled = false;
c125e96f RW	222	}
40dc166c	223	syscore_resume();
a9d70523 RW	224	}
	225
	226	arch_suspend_enable_irqs();
	227	BUG_ON(irqs_disabled());
	228
	229	Enable_cpus:
	230	enable_nonboot_cpus();
	231
	232	Platform_wake:
7e73c5ae	233	if (need_suspend_ops(state) && suspend_ops->wake)
a9d70523 RW	234	suspend_ops->wake();
a9d70523 RW	235
cf579dfb	236	dpm_resume_start(PMSG_RESUME);
a9d70523	237
ce441011	238	Platform_finish:
7e73c5ae	239	if (need_suspend_ops(state) && suspend_ops->finish)
a9d70523 RW	240	suspend_ops->finish();
	241
	242	return error;
	243	}
	244
	245	/**
55ae4519 RW	246	* suspend_devices_and_enter - Suspend devices and enter system sleep state.
55ae4519 RW	247	* @state: System sleep state to enter.
a9d70523 RW	248	*/
	249	int suspend_devices_and_enter(suspend_state_t state)
	250	{
	251	int error;
3b5fe852	252	bool wakeup = false;
a9d70523	253
7e73c5ae	254	if (need_suspend_ops(state) && !suspend_ops)
a9d70523 RW	255	return -ENOSYS;
a9d70523 RW	256
6fa3eb70 S	257	#ifdef CONFIG_TOI
	258	drop_pagecache();
	259	#endif
	260
938cfed1	261	trace_machine_suspend(state);
7e73c5ae	262	if (need_suspend_ops(state) && suspend_ops->begin) {
a9d70523 RW	263	error = suspend_ops->begin(state);
	264	if (error)
	265	goto Close;
	266	}
	267	suspend_console();
443772d4	268	ftrace_stop();
a9d70523 RW	269	suspend_test_start();
	270	error = dpm_suspend_start(PMSG_SUSPEND);
	271	if (error) {
	272	printk(KERN_ERR "PM: Some devices failed to suspend\n");
	273	goto Recover_platform;
	274	}
	275	suspend_test_finish("suspend devices");
	276	if (suspend_test(TEST_DEVICES))
	277	goto Recover_platform;
	278
3b5fe852 MH	279	do {
3b5fe852 MH	280	error = suspend_enter(state, &wakeup);
7e73c5ae	281	} while (!error && !wakeup && need_suspend_ops(state)
3b5fe852	282	&& suspend_ops->suspend_again && suspend_ops->suspend_again());
a9d70523 RW	283
	284	Resume_devices:
	285	suspend_test_start();
	286	dpm_resume_end(PMSG_RESUME);
	287	suspend_test_finish("resume devices");
443772d4	288	ftrace_start();
a9d70523 RW	289	resume_console();
a9d70523 RW	290	Close:
7e73c5ae	291	if (need_suspend_ops(state) && suspend_ops->end)
a9d70523	292	suspend_ops->end();
938cfed1	293	trace_machine_suspend(PWR_EVENT_EXIT);
a9d70523 RW	294	return error;
	295
	296	Recover_platform:
7e73c5ae	297	if (need_suspend_ops(state) && suspend_ops->recover)
a9d70523 RW	298	suspend_ops->recover();
	299	goto Resume_devices;
	300	}
6fa3eb70	301	EXPORT_SYMBOL_GPL(suspend_devices_and_enter);
a9d70523 RW	302
a9d70523 RW	303	/**
55ae4519	304	* suspend_finish - Clean up before finishing the suspend sequence.
a9d70523	305	*
55ae4519 RW	306	* Call platform code to clean up, restart processes, and free the console that
55ae4519 RW	307	* we've allocated. This routine is not called for hibernation.
a9d70523 RW	308	*/
	309	static void suspend_finish(void)
	310	{
	311	suspend_thaw_processes();
a9d70523 RW	312	pm_notifier_call_chain(PM_POST_SUSPEND);
	313	pm_restore_console();
	314	}
	315
	316	/**
55ae4519 RW	317	* enter_state - Do common work needed to enter system sleep state.
55ae4519 RW	318	* @state: System sleep state to enter.
a9d70523	319	*
55ae4519 RW	320	* Make sure that no one else is trying to put the system into a sleep state.
	321	* Fail if that's not the case. Otherwise, prepare for system suspend, make the
	322	* system enter the given sleep state and clean up after wakeup.
a9d70523	323	*/
6fa3eb70 S	324	//<20130327> <marc.huang> merge from android kernel 3.0 - modify enter_state function to non-static
6fa3eb70 S	325	int enter_state(suspend_state_t state)
a9d70523 RW	326	{
	327	int error;
	328
5c95fef6 RW	329	if (state == PM_SUSPEND_FREEZE) {
	330	#ifdef CONFIG_PM_DEBUG
	331	if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) {
	332	pr_warning("PM: Unsupported test mode for freeze state,"
	333	"please choose none/freezer/devices/platform.\n");
	334	return -EAGAIN;
	335	}
	336	#endif
	337	} else if (!valid_state(state)) {
	338	return -EINVAL;
	339	}
a9d70523 RW	340	if (!mutex_trylock(&pm_mutex))
	341	return -EBUSY;
	342
7e73c5ae ZR	343	if (state == PM_SUSPEND_FREEZE)
	344	freeze_begin();
	345
a9d70523	346	printk(KERN_INFO "PM: Syncing filesystems ... ");
6fa3eb70	347	#if 1
a9d70523	348	sys_sync();
6fa3eb70 S	349	#else /* sys_sync WQ ver2.0 use */
	350	//[MTK]
	351	suspend_syssync_enqueue();
	352	suspend_check_sys_sync_done();
	353	#endif
a9d70523 RW	354	printk("done.\n");
a9d70523 RW	355
e89547b8	356	pr_debug("PM: Preparing system for %s sleep\n", pm_states[state].label);
7e73c5ae	357	error = suspend_prepare(state);
a9d70523 RW	358	if (error)
	359	goto Unlock;
	360
	361	if (suspend_test(TEST_FREEZER))
	362	goto Finish;
	363
e89547b8	364	pr_debug("PM: Entering %s sleep\n", pm_states[state].label);
87186475	365	pm_restrict_gfp_mask();
a9d70523	366	error = suspend_devices_and_enter(state);
87186475	367	pm_restore_gfp_mask();
a9d70523 RW	368
	369	Finish:
	370	pr_debug("PM: Finishing wakeup.\n");
	371	suspend_finish();
	372	Unlock:
	373	mutex_unlock(&pm_mutex);
	374	return error;
	375	}
	376
6fa3eb70 S	377	static void pm_suspend_marker(char *annotation)
	378	{
	379	struct timespec ts;
	380	struct rtc_time tm;
	381
	382	getnstimeofday(&ts);
	383	rtc_time_to_tm(ts.tv_sec, &tm);
	384	pr_info("PM: suspend %s %d-%02d-%02d %02d:%02d:%02d.%09lu UTC\n",
	385	annotation, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
	386	tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec);
	387	}
	388
a9d70523	389	/**
55ae4519 RW	390	* pm_suspend - Externally visible function for suspending the system.
55ae4519 RW	391	* @state: System sleep state to enter.
a9d70523	392	*
55ae4519 RW	393	* Check if the value of @state represents one of the supported states,
55ae4519 RW	394	* execute enter_state() and update system suspend statistics.
a9d70523 RW	395	*/
	396	int pm_suspend(suspend_state_t state)
	397	{
bc25cf50 RW	398	int error;
	399
	400	if (state <= PM_SUSPEND_ON \|\| state >= PM_SUSPEND_MAX)
	401	return -EINVAL;
	402
6fa3eb70	403	pm_suspend_marker("entry");
bc25cf50 RW	404	error = enter_state(state);
	405	if (error) {
	406	suspend_stats.fail++;
	407	dpm_save_failed_errno(error);
	408	} else {
	409	suspend_stats.success++;
2a77c46d	410	}
6fa3eb70	411	pm_suspend_marker("exit");
bc25cf50	412	return error;
a9d70523 RW	413	}
a9d70523 RW	414	EXPORT_SYMBOL(pm_suspend);