samsung update 1

13 files changed, 2167 insertions, 14 deletions

diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 87f4d24..56afb61 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -18,6 +18,81 @@ config SUSPEND_FREEZER
 
 	  Turning OFF this setting is NOT recommended! If in doubt, say Y.
 
+config PM_WATCHDOG_TIMEOUT
+	bool "PM Watchdog timeout"
+	depends on CPU_EXYNOS4210
+	default y
+	---help---
+	  Enable PM watchdog timer to catch lockup during early_suspend,
+	  late_resume and suspend_finish.
+
+config HAS_WAKELOCK
+	bool
+
+config HAS_EARLYSUSPEND
+	bool
+
+config WAKELOCK
+	bool "Wake lock"
+	depends on PM && RTC_CLASS
+	default n
+	select HAS_WAKELOCK
+	---help---
+	  Enable wakelocks. When user space request a sleep state the
+	  sleep request will be delayed until no wake locks are held.
+
+config WAKELOCK_STAT
+	bool "Wake lock stats"
+	depends on WAKELOCK
+	default y
+	---help---
+	  Report wake lock stats in /proc/wakelocks
+
+config USER_WAKELOCK
+	bool "Userspace wake locks"
+	depends on WAKELOCK
+	default y
+	---help---
+	  User-space wake lock api. Write "lockname" or "lockname timeout"
+	  to /sys/power/wake_lock lock and if needed create a wake lock.
+	  Write "lockname" to /sys/power/wake_unlock to unlock a user wake
+	  lock.
+
+config EARLYSUSPEND
+	bool "Early suspend"
+	depends on WAKELOCK
+	default y
+	select HAS_EARLYSUSPEND
+	---help---
+	  Call early suspend handlers when the user requested sleep state
+	  changes.
+
+choice
+	prompt "User-space screen access"
+	default FB_EARLYSUSPEND if !FRAMEBUFFER_CONSOLE
+	default CONSOLE_EARLYSUSPEND
+	depends on HAS_EARLYSUSPEND
+
+	config NO_USER_SPACE_SCREEN_ACCESS_CONTROL
+		bool "None"
+
+	config CONSOLE_EARLYSUSPEND
+		bool "Console switch on early-suspend"
+		depends on HAS_EARLYSUSPEND && VT
+		---help---
+		  Register early suspend handler to perform a console switch to
+		  when user-space should stop drawing to the screen and a switch
+		  back when it should resume.
+
+	config FB_EARLYSUSPEND
+		bool "Sysfs interface"
+		depends on HAS_EARLYSUSPEND
+		---help---
+		  Register early suspend handler that notifies and waits for
+		  user-space through sysfs when user-space should stop drawing
+		  to the screen and notifies user-space when it should resume.
+endchoice
+
 config HIBERNATE_CALLBACKS
 	bool
 
@@ -65,6 +140,18 @@ config HIBERNATION
 
 	  For more information take a look at <file:Documentation/power/swsusp.txt>.
 
+config FULL_PAGE_RECLAIM
+	bool "Using Full Page Reclaim during Suspend-to-Disk"
+	depends on HIBERNATION
+	default n
+	---help---
+	  Reclaim whole pages if possible before creating hibernation snapshot
+	  image. For reducing snapshot image size, reclaim them.
+
+	  With this config, the size of hibernation snapshot image is
+	  dramatically decreased and small size of hibernation snapshot image
+	  has benefit for fast booting.
+
 config PM_STD_PARTITION
 	string "Default resume partition"
 	depends on HIBERNATION
@@ -227,3 +314,10 @@ config PM_OPP
 config PM_RUNTIME_CLK
 	def_bool y
 	depends on PM_RUNTIME && HAVE_CLK
+
+config SUSPEND_TIME
+	bool "Log time spent in suspend"
+	---help---
+	  Prints the time spent in suspend in the kernel log, and
+	  keeps statistics on the time spent in suspend in
+	  /sys/kernel/debug/suspend_time
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index c5ebc6a..9b224e1 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -8,5 +8,11 @@ obj-$(CONFIG_SUSPEND)		+= suspend.o
 obj-$(CONFIG_PM_TEST_SUSPEND)	+= suspend_test.o
 obj-$(CONFIG_HIBERNATION)	+= hibernate.o snapshot.o swap.o user.o \
 				   block_io.o
+obj-$(CONFIG_WAKELOCK)		+= wakelock.o
+obj-$(CONFIG_USER_WAKELOCK)	+= userwakelock.o
+obj-$(CONFIG_EARLYSUSPEND)	+= earlysuspend.o
+obj-$(CONFIG_CONSOLE_EARLYSUSPEND)	+= consoleearlysuspend.o
+obj-$(CONFIG_FB_EARLYSUSPEND)	+= fbearlysuspend.o
+obj-$(CONFIG_SUSPEND_TIME)	+= suspend_time.o
 
 obj-$(CONFIG_MAGIC_SYSRQ)	+= poweroff.o
diff --git a/kernel/power/consoleearlysuspend.c b/kernel/power/consoleearlysuspend.c
new file mode 100644
index 0000000..a3edcb2
--- /dev/null
+++ b/kernel/power/consoleearlysuspend.c
@@ -0,0 +1,78 @@
+/* kernel/power/consoleearlysuspend.c
+ *
+ * Copyright (C) 2005-2008 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/console.h>
+#include <linux/earlysuspend.h>
+#include <linux/kbd_kern.h>
+#include <linux/module.h>
+#include <linux/vt_kern.h>
+#include <linux/wait.h>
+
+#define EARLY_SUSPEND_CONSOLE	(MAX_NR_CONSOLES-1)
+
+static int orig_fgconsole;
+static void console_early_suspend(struct early_suspend *h)
+{
+	acquire_console_sem();
+	orig_fgconsole = fg_console;
+	if (vc_allocate(EARLY_SUSPEND_CONSOLE))
+		goto err;
+	if (set_console(EARLY_SUSPEND_CONSOLE))
+		goto err;
+	release_console_sem();
+
+	if (vt_waitactive(EARLY_SUSPEND_CONSOLE + 1))
+		pr_warning("console_early_suspend: Can't switch VCs.\n");
+	return;
+err:
+	pr_warning("console_early_suspend: Can't set console\n");
+	release_console_sem();
+}
+
+static void console_late_resume(struct early_suspend *h)
+{
+	int ret;
+	acquire_console_sem();
+	ret = set_console(orig_fgconsole);
+	release_console_sem();
+	if (ret) {
+		pr_warning("console_late_resume: Can't set console.\n");
+		return;
+	}
+
+	if (vt_waitactive(orig_fgconsole + 1))
+		pr_warning("console_late_resume: Can't switch VCs.\n");
+}
+
+static struct early_suspend console_early_suspend_desc = {
+	.level = EARLY_SUSPEND_LEVEL_STOP_DRAWING,
+	.suspend = console_early_suspend,
+	.resume = console_late_resume,
+};
+
+static int __init console_early_suspend_init(void)
+{
+	register_early_suspend(&console_early_suspend_desc);
+	return 0;
+}
+
+static void  __exit console_early_suspend_exit(void)
+{
+	unregister_early_suspend(&console_early_suspend_desc);
+}
+
+module_init(console_early_suspend_init);
+module_exit(console_early_suspend_exit);
+
diff --git a/kernel/power/earlysuspend.c b/kernel/power/earlysuspend.c
new file mode 100644
index 0000000..1c293ce
--- /dev/null
+++ b/kernel/power/earlysuspend.c
@@ -0,0 +1,212 @@
+/* kernel/power/earlysuspend.c
+ *
+ * Copyright (C) 2005-2008 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/earlysuspend.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/rtc.h>
+#include <linux/syscalls.h> /* sys_sync */
+#include <linux/wakelock.h>
+#include <linux/workqueue.h>
+
+#include "power.h"
+
+enum {
+	DEBUG_USER_STATE = 1U << 0,
+	DEBUG_SUSPEND = 1U << 2,
+	DEBUG_VERBOSE = 1U << 3,
+};
+static int debug_mask = DEBUG_USER_STATE;
+module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
+
+static DEFINE_MUTEX(early_suspend_lock);
+static LIST_HEAD(early_suspend_handlers);
+static void sync_system(struct work_struct *work);
+static void early_suspend(struct work_struct *work);
+static void late_resume(struct work_struct *work);
+static DECLARE_WORK(sync_system_work, sync_system);
+static DECLARE_WORK(early_suspend_work, early_suspend);
+static DECLARE_WORK(late_resume_work, late_resume);
+static DEFINE_SPINLOCK(state_lock);
+enum {
+	SUSPEND_REQUESTED = 0x1,
+	SUSPENDED = 0x2,
+	SUSPEND_REQUESTED_AND_SUSPENDED = SUSPEND_REQUESTED | SUSPENDED,
+};
+static int state;
+
+static void sync_system(struct work_struct *work)
+{
+	pr_info("%s +\n", __func__);
+	wake_lock(&sync_wake_lock);
+	sys_sync();
+	wake_unlock(&sync_wake_lock);
+	pr_info("%s -\n", __func__);
+}
+
+void register_early_suspend(struct early_suspend *handler)
+{
+	struct list_head *pos;
+
+	mutex_lock(&early_suspend_lock);
+	list_for_each(pos, &early_suspend_handlers) {
+		struct early_suspend *e;
+		e = list_entry(pos, struct early_suspend, link);
+		if (e->level > handler->level)
+			break;
+	}
+	list_add_tail(&handler->link, pos);
+	if ((state & SUSPENDED) && handler->suspend)
+		handler->suspend(handler);
+	mutex_unlock(&early_suspend_lock);
+}
+EXPORT_SYMBOL(register_early_suspend);
+
+void unregister_early_suspend(struct early_suspend *handler)
+{
+	mutex_lock(&early_suspend_lock);
+	list_del(&handler->link);
+	mutex_unlock(&early_suspend_lock);
+}
+EXPORT_SYMBOL(unregister_early_suspend);
+
+static void early_suspend(struct work_struct *work)
+{
+	struct early_suspend *pos;
+	unsigned long irqflags;
+	int abort = 0;
+	struct timer_list timer;
+	struct pm_wd_data data;
+
+	pm_wd_add_timer(&timer, &data, 30);
+
+	mutex_lock(&early_suspend_lock);
+	spin_lock_irqsave(&state_lock, irqflags);
+	if (state == SUSPEND_REQUESTED)
+		state |= SUSPENDED;
+	else
+		abort = 1;
+	spin_unlock_irqrestore(&state_lock, irqflags);
+
+	if (abort) {
+		if (debug_mask & DEBUG_SUSPEND)
+			pr_info("early_suspend: abort, state %d\n", state);
+		mutex_unlock(&early_suspend_lock);
+		goto abort;
+	}
+
+	if (debug_mask & DEBUG_SUSPEND)
+		pr_info("early_suspend: call handlers\n");
+	list_for_each_entry(pos, &early_suspend_handlers, link) {
+		if (pos->suspend != NULL) {
+			if (debug_mask & DEBUG_VERBOSE)
+				pr_info("early_suspend: calling %pf\n", pos->suspend);
+			pos->suspend(pos);
+		}
+	}
+	mutex_unlock(&early_suspend_lock);
+
+	if (debug_mask & DEBUG_SUSPEND)
+		pr_info("early_suspend: sync\n");
+
+	/* sys_sync(); */
+	queue_work(sync_work_queue, &sync_system_work);
+
+abort:
+	spin_lock_irqsave(&state_lock, irqflags);
+	if (state == SUSPEND_REQUESTED_AND_SUSPENDED)
+		wake_unlock(&main_wake_lock);
+	spin_unlock_irqrestore(&state_lock, irqflags);
+
+	pm_wd_del_timer(&timer);
+}
+
+static void late_resume(struct work_struct *work)
+{
+	struct early_suspend *pos;
+	unsigned long irqflags;
+	int abort = 0;
+	struct timer_list timer;
+	struct pm_wd_data data;
+
+	pm_wd_add_timer(&timer, &data, 30);
+
+	mutex_lock(&early_suspend_lock);
+	spin_lock_irqsave(&state_lock, irqflags);
+	if (state == SUSPENDED)
+		state &= ~SUSPENDED;
+	else
+		abort = 1;
+	spin_unlock_irqrestore(&state_lock, irqflags);
+
+	if (abort) {
+		if (debug_mask & DEBUG_SUSPEND)
+			pr_info("late_resume: abort, state %d\n", state);
+		goto abort;
+	}
+	if (debug_mask & DEBUG_SUSPEND)
+		pr_info("late_resume: call handlers\n");
+	list_for_each_entry_reverse(pos, &early_suspend_handlers, link) {
+		if (pos->resume != NULL) {
+			if (debug_mask & DEBUG_VERBOSE)
+				pr_info("late_resume: calling %pf\n", pos->resume);
+
+			pos->resume(pos);
+		}
+	}
+	if (debug_mask & DEBUG_SUSPEND)
+		pr_info("late_resume: done\n");
+abort:
+	mutex_unlock(&early_suspend_lock);
+
+	pm_wd_del_timer(&timer);
+}
+
+void request_suspend_state(suspend_state_t new_state)
+{
+	unsigned long irqflags;
+	int old_sleep;
+
+	spin_lock_irqsave(&state_lock, irqflags);
+	old_sleep = state & SUSPEND_REQUESTED;
+	if (debug_mask & DEBUG_USER_STATE) {
+		struct timespec ts;
+		struct rtc_time tm;
+		getnstimeofday(&ts);
+		rtc_time_to_tm(ts.tv_sec, &tm);
+		pr_info("request_suspend_state: %s (%d->%d) at %lld "
+			"(%d-%02d-%02d %02d:%02d:%02d.%09lu UTC)\n",
+			new_state != PM_SUSPEND_ON ? "sleep" : "wakeup",
+			requested_suspend_state, new_state,
+			ktime_to_ns(ktime_get()),
+			tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
+			tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec);
+	}
+	if (!old_sleep && new_state != PM_SUSPEND_ON) {
+		state |= SUSPEND_REQUESTED;
+		queue_work(suspend_work_queue, &early_suspend_work);
+	} else if (old_sleep && new_state == PM_SUSPEND_ON) {
+		state &= ~SUSPEND_REQUESTED;
+		wake_lock(&main_wake_lock);
+		queue_work(suspend_work_queue, &late_resume_work);
+	}
+	requested_suspend_state = new_state;
+	spin_unlock_irqrestore(&state_lock, irqflags);
+}
+
+suspend_state_t get_suspend_state(void)
+{
+	return requested_suspend_state;
+}
diff --git a/kernel/power/fbearlysuspend.c b/kernel/power/fbearlysuspend.c
new file mode 100644
index 0000000..1513765
--- /dev/null
+++ b/kernel/power/fbearlysuspend.c
@@ -0,0 +1,153 @@
+/* kernel/power/fbearlysuspend.c
+ *
+ * Copyright (C) 2005-2008 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/earlysuspend.h>
+#include <linux/module.h>
+#include <linux/wait.h>
+
+#include "power.h"
+
+static wait_queue_head_t fb_state_wq;
+static DEFINE_SPINLOCK(fb_state_lock);
+static enum {
+	FB_STATE_STOPPED_DRAWING,
+	FB_STATE_REQUEST_STOP_DRAWING,
+	FB_STATE_DRAWING_OK,
+} fb_state;
+
+/* tell userspace to stop drawing, wait for it to stop */
+static void stop_drawing_early_suspend(struct early_suspend *h)
+{
+	int ret;
+	unsigned long irq_flags;
+
+	spin_lock_irqsave(&fb_state_lock, irq_flags);
+	fb_state = FB_STATE_REQUEST_STOP_DRAWING;
+	spin_unlock_irqrestore(&fb_state_lock, irq_flags);
+
+	wake_up_all(&fb_state_wq);
+	ret = wait_event_timeout(fb_state_wq,
+				 fb_state == FB_STATE_STOPPED_DRAWING,
+				 HZ);
+	if (unlikely(fb_state != FB_STATE_STOPPED_DRAWING))
+		pr_warning("stop_drawing_early_suspend: timeout waiting for "
+			   "userspace to stop drawing\n");
+}
+
+/* tell userspace to start drawing */
+static void start_drawing_late_resume(struct early_suspend *h)
+{
+	unsigned long irq_flags;
+
+	spin_lock_irqsave(&fb_state_lock, irq_flags);
+	fb_state = FB_STATE_DRAWING_OK;
+	spin_unlock_irqrestore(&fb_state_lock, irq_flags);
+	wake_up(&fb_state_wq);
+}
+
+static struct early_suspend stop_drawing_early_suspend_desc = {
+	.level = EARLY_SUSPEND_LEVEL_STOP_DRAWING,
+	.suspend = stop_drawing_early_suspend,
+	.resume = start_drawing_late_resume,
+};
+
+static ssize_t wait_for_fb_sleep_show(struct kobject *kobj,
+				      struct kobj_attribute *attr, char *buf)
+{
+	char *s = buf;
+	int ret;
+
+	ret = wait_event_interruptible(fb_state_wq,
+				       fb_state != FB_STATE_DRAWING_OK);
+	if (ret && fb_state == FB_STATE_DRAWING_OK)
+		return ret;
+	else
+		s += sprintf(buf, "sleeping");
+	return s - buf;
+}
+
+static ssize_t wait_for_fb_wake_show(struct kobject *kobj,
+				     struct kobj_attribute *attr, char *buf)
+{
+	char *s = buf;
+	int ret;
+	unsigned long irq_flags;
+
+	spin_lock_irqsave(&fb_state_lock, irq_flags);
+	if (fb_state == FB_STATE_REQUEST_STOP_DRAWING) {
+		fb_state = FB_STATE_STOPPED_DRAWING;
+		wake_up(&fb_state_wq);
+	}
+	spin_unlock_irqrestore(&fb_state_lock, irq_flags);
+
+	ret = wait_event_interruptible(fb_state_wq,
+				       fb_state == FB_STATE_DRAWING_OK);
+	if (ret && fb_state != FB_STATE_DRAWING_OK)
+		return ret;
+	else
+		s += sprintf(buf, "awake");
+
+	return s - buf;
+}
+
+#define power_ro_attr(_name) \
+static struct kobj_attribute _name##_attr = {	\
+	.attr	= {				\
+		.name = __stringify(_name),	\
+		.mode = 0444,			\
+	},					\
+	.show	= _name##_show,			\
+	.store	= NULL,		\
+}
+
+power_ro_attr(wait_for_fb_sleep);
+power_ro_attr(wait_for_fb_wake);
+
+static struct attribute *g[] = {
+	&wait_for_fb_sleep_attr.attr,
+	&wait_for_fb_wake_attr.attr,
+	NULL,
+};
+
+static struct attribute_group attr_group = {
+	.attrs = g,
+};
+
+static int __init android_power_init(void)
+{
+	int ret;
+
+	init_waitqueue_head(&fb_state_wq);
+	fb_state = FB_STATE_DRAWING_OK;
+
+	ret = sysfs_create_group(power_kobj, &attr_group);
+	if (ret) {
+		pr_err("android_power_init: sysfs_create_group failed\n");
+		return ret;
+	}
+
+	register_early_suspend(&stop_drawing_early_suspend_desc);
+	return 0;
+}
+
+static void  __exit android_power_exit(void)
+{
+	unregister_early_suspend(&stop_drawing_early_suspend_desc);
+	sysfs_remove_group(power_kobj, &attr_group);
+}
+
+module_init(android_power_init);
+module_exit(android_power_exit);
+
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 2981af4..7f6987f 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -13,6 +13,31 @@
 #include <linux/resume-trace.h>
 #include <linux/workqueue.h>
 
+#if defined(CONFIG_CPU_FREQ) && defined(CONFIG_ARCH_EXYNOS4)
+#define CONFIG_DVFS_LIMIT
+#endif
+
+#if defined(CONFIG_CPU_EXYNOS4210)
+#define CONFIG_GPU_LOCK
+#define CONFIG_ROTATION_BOOSTER_SUPPORT
+#endif
+
+#ifdef CONFIG_DVFS_LIMIT
+#include <linux/cpufreq.h>
+#include <mach/cpufreq.h>
+#endif
+
+#ifdef CONFIG_GPU_LOCK
+#include <mach/gpufreq.h>
+#endif
+
+#if defined(CONFIG_CPU_EXYNOS4412) && defined(CONFIG_VIDEO_MALI400MP) \
+		&& defined(CONFIG_VIDEO_MALI400MP_DVFS)
+#define CONFIG_PEGASUS_GPU_LOCK
+extern int mali_dvfs_bottom_lock_push(int lock_step);
+extern int mali_dvfs_bottom_lock_pop(void);
+#endif
+
 #include "power.h"
 
 DEFINE_MUTEX(pm_mutex);
@@ -170,7 +195,11 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
 			   const char *buf, size_t n)
 {
 #ifdef CONFIG_SUSPEND
+#ifdef CONFIG_EARLYSUSPEND
+	suspend_state_t state = PM_SUSPEND_ON;
+#else
 	suspend_state_t state = PM_SUSPEND_STANDBY;
+#endif
 	const char * const *s;
 #endif
 	char *p;
@@ -192,8 +221,15 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
 			break;
 	}
 	if (state < PM_SUSPEND_MAX && *s)
+#ifdef CONFIG_EARLYSUSPEND
+		if (state == PM_SUSPEND_ON || valid_state(state)) {
+			error = 0;
+			request_suspend_state(state);
+		}
+#else
 		error = enter_state(state);
 #endif
+#endif
 
  Exit:
 	return error ? error : n;
@@ -297,6 +333,372 @@ power_attr(pm_trace_dev_match);
 
 #endif /* CONFIG_PM_TRACE */
 
+#ifdef CONFIG_USER_WAKELOCK
+power_attr(wake_lock);
+power_attr(wake_unlock);
+#endif
+
+#ifdef CONFIG_DVFS_LIMIT
+static int cpufreq_max_limit_val = -1;
+static int cpufreq_min_limit_val = -1;
+DEFINE_MUTEX(cpufreq_limit_mutex);
+
+static ssize_t cpufreq_table_show(struct kobject *kobj,
+				struct kobj_attribute *attr,
+				char *buf)
+{
+	ssize_t count = 0;
+	struct cpufreq_frequency_table *table;
+	struct cpufreq_policy *policy;
+	unsigned int min_freq = ~0;
+	unsigned int max_freq = 0;
+	unsigned int i = 0;
+
+	table = cpufreq_frequency_get_table(0);
+	if (!table) {
+		printk(KERN_ERR "%s: Failed to get the cpufreq table\n",
+			__func__);
+		return sprintf(buf, "Failed to get the cpufreq table\n");
+	}
+
+	policy = cpufreq_cpu_get(0);
+	if (policy) {
+	#if 0 /* /sys/devices/system/cpu/cpu0/cpufreq/scaling_min&max_freq */
+		min_freq = policy->min_freq;
+		max_freq = policy->max_freq;
+	#else /* /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min&max_freq */
+		min_freq = policy->cpuinfo.min_freq;
+		max_freq = policy->cpuinfo.max_freq;
+	#endif
+	}
+
+	for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
+		if ((table[i].frequency == CPUFREQ_ENTRY_INVALID) ||
+		    (table[i].frequency > max_freq) ||
+		    (table[i].frequency < min_freq))
+			continue;
+		count += sprintf(&buf[count], "%d ", table[i].frequency);
+	}
+	count += sprintf(&buf[count], "\n");
+
+	return count;
+}
+
+static ssize_t cpufreq_table_store(struct kobject *kobj,
+				struct kobj_attribute *attr,
+				const char *buf, size_t n)
+{
+	printk(KERN_ERR "%s: cpufreq_table is read-only\n", __func__);
+	return -EINVAL;
+}
+
+#define VALID_LEVEL 1
+static int get_cpufreq_level(unsigned int freq, unsigned int *level)
+{
+	struct cpufreq_frequency_table *table;
+	unsigned int i = 0;
+
+	table = cpufreq_frequency_get_table(0);
+	if (!table) {
+		printk(KERN_ERR "%s: Failed to get the cpufreq table\n",
+			__func__);
+		return -EINVAL;
+	}
+
+	for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++)
+		if (table[i].frequency == freq) {
+			*level = i;
+			return VALID_LEVEL;
+		}
+
+	printk(KERN_ERR "%s: %u KHz is an unsupported cpufreq\n",
+		__func__, freq);
+	return -EINVAL;
+}
+
+static ssize_t cpufreq_max_limit_show(struct kobject *kobj,
+					struct kobj_attribute *attr,
+					char *buf)
+{
+	return sprintf(buf, "%d\n", cpufreq_max_limit_val);
+}
+
+static ssize_t cpufreq_max_limit_store(struct kobject *kobj,
+					struct kobj_attribute *attr,
+					const char *buf, size_t n)
+{
+	int val;
+	unsigned int cpufreq_level;
+	int lock_ret;
+	ssize_t ret = -EINVAL;
+
+	mutex_lock(&cpufreq_limit_mutex);
+
+	if (sscanf(buf, "%d", &val) != 1) {
+		printk(KERN_ERR "%s: Invalid cpufreq format\n", __func__);
+		goto out;
+	}
+
+	if (val == -1) { /* Unlock request */
+		if (cpufreq_max_limit_val != -1) {
+			exynos_cpufreq_upper_limit_free(DVFS_LOCK_ID_USER);
+			cpufreq_max_limit_val = -1;
+		} else /* Already unlocked */
+			printk(KERN_ERR "%s: Unlock request is ignored\n",
+				__func__);
+	} else { /* Lock request */
+		if (get_cpufreq_level((unsigned int)val, &cpufreq_level)
+		    == VALID_LEVEL) {
+			if (cpufreq_max_limit_val != -1)
+				/* Unlock the previous lock */
+				exynos_cpufreq_upper_limit_free(
+					DVFS_LOCK_ID_USER);
+			lock_ret = exynos_cpufreq_upper_limit(
+					DVFS_LOCK_ID_USER, cpufreq_level);
+			/* ret of exynos_cpufreq_upper_limit is meaningless.
+			   0 is fail? success? */
+			cpufreq_max_limit_val = val;
+		} else /* Invalid lock request --> No action */
+			printk(KERN_ERR "%s: Lock request is invalid\n",
+				__func__);
+	}
+
+	ret = n;
+out:
+	mutex_unlock(&cpufreq_limit_mutex);
+	return ret;
+}
+
+static ssize_t cpufreq_min_limit_show(struct kobject *kobj,
+					struct kobj_attribute *attr,
+					char *buf)
+{
+	return sprintf(buf, "%d\n", cpufreq_min_limit_val);
+}
+
+static ssize_t cpufreq_min_limit_store(struct kobject *kobj,
+					struct kobj_attribute *attr,
+					const char *buf, size_t n)
+{
+	int val;
+	unsigned int cpufreq_level;
+	int lock_ret;
+	ssize_t ret = -EINVAL;
+
+	mutex_lock(&cpufreq_limit_mutex);
+
+	if (sscanf(buf, "%d", &val) != 1) {
+		printk(KERN_ERR "%s: Invalid cpufreq format\n", __func__);
+		goto out;
+	}
+
+	if (val == -1) { /* Unlock request */
+		if (cpufreq_min_limit_val != -1) {
+			exynos_cpufreq_lock_free(DVFS_LOCK_ID_USER);
+			cpufreq_min_limit_val = -1;
+		} else /* Already unlocked */
+			printk(KERN_ERR "%s: Unlock request is ignored\n",
+				__func__);
+	} else { /* Lock request */
+		if (get_cpufreq_level((unsigned int)val, &cpufreq_level)
+			== VALID_LEVEL) {
+			if (cpufreq_min_limit_val != -1)
+				/* Unlock the previous lock */
+				exynos_cpufreq_lock_free(DVFS_LOCK_ID_USER);
+			lock_ret = exynos_cpufreq_lock(
+					DVFS_LOCK_ID_USER, cpufreq_level);
+			/* ret of exynos_cpufreq_lock is meaningless.
+			   0 is fail? success? */
+			cpufreq_min_limit_val = val;
+		if ((cpufreq_max_limit_val != -1) &&
+			    (cpufreq_min_limit_val > cpufreq_max_limit_val))
+				printk(KERN_ERR "%s: Min lock may not work well"
+					" because of Max lock\n", __func__);
+		} else /* Invalid lock request --> No action */
+			printk(KERN_ERR "%s: Lock request is invalid\n",
+				__func__);
+	}
+
+	ret = n;
+out:
+	mutex_unlock(&cpufreq_limit_mutex);
+	return ret;
+}
+
+power_attr(cpufreq_table);
+power_attr(cpufreq_max_limit);
+power_attr(cpufreq_min_limit);
+#endif /* CONFIG_DVFS_LIMIT */
+
+#ifdef CONFIG_GPU_LOCK
+static int gpu_lock_val;
+DEFINE_MUTEX(gpu_lock_mutex);
+
+static ssize_t gpu_lock_show(struct kobject *kobj,
+					struct kobj_attribute *attr,
+					char *buf)
+{
+	return sprintf(buf, "%d\n", gpu_lock_val);
+}
+
+static ssize_t gpu_lock_store(struct kobject *kobj,
+					struct kobj_attribute *attr,
+					const char *buf, size_t n)
+{
+	int val;
+	ssize_t ret = -EINVAL;
+
+	mutex_lock(&gpu_lock_mutex);
+
+	if (sscanf(buf, "%d", &val) != 1) {
+		pr_info("%s: Invalid mali lock format\n", __func__);
+		goto out;
+	}
+
+	if (val == 0) {
+		if (gpu_lock_val != 0) {
+			exynos_gpufreq_unlock();
+			gpu_lock_val = 0;
+		} else {
+			pr_info("%s: Unlock request is ignored\n", __func__);
+		}
+	} else if (val == 1) {
+		if (gpu_lock_val == 0) {
+			exynos_gpufreq_lock();
+			gpu_lock_val = val;
+		} else {
+			pr_info("%s: Lock request is ignored\n", __func__);
+		}
+	} else {
+		pr_info("%s: Lock request is invalid\n", __func__);
+	}
+
+	ret = n;
+out:
+	mutex_unlock(&gpu_lock_mutex);
+	return ret;
+}
+power_attr(gpu_lock);
+#endif
+
+#ifdef CONFIG_ROTATION_BOOSTER_SUPPORT
+static inline void rotation_booster_on(void)
+{
+	exynos_cpufreq_lock(DVFS_LOCK_ID_ROTATION_BOOSTER, L0);
+	exynos4_busfreq_lock(DVFS_LOCK_ID_ROTATION_BOOSTER, BUS_L0);
+	exynos_gpufreq_lock();
+}
+
+static inline void rotation_booster_off(void)
+{
+	exynos_gpufreq_unlock();
+	exynos4_busfreq_lock_free(DVFS_LOCK_ID_ROTATION_BOOSTER);
+	exynos_cpufreq_lock_free(DVFS_LOCK_ID_ROTATION_BOOSTER);
+}
+
+static int rotation_booster_val;
+DEFINE_MUTEX(rotation_booster_mutex);
+
+static ssize_t rotation_booster_show(struct kobject *kobj,
+					struct kobj_attribute *attr,
+					char *buf)
+{
+	return sprintf(buf, "%d\n", rotation_booster_val);
+}
+
+static ssize_t rotation_booster_store(struct kobject *kobj,
+					struct kobj_attribute *attr,
+					const char *buf, size_t n)
+{
+	int val;
+	ssize_t ret = -EINVAL;
+
+	mutex_lock(&rotation_booster_mutex);
+
+	if (sscanf(buf, "%d", &val) != 1) {
+		pr_info("%s: Invalid rotation_booster on, off format\n", \
+			__func__);
+		goto out;
+	}
+
+	if (val == 0) {
+		if (rotation_booster_val != 0) {
+			rotation_booster_off();
+			rotation_booster_val = 0;
+		} else {
+			pr_info("%s: rotation_booster off request"
+				" is ignored\n", __func__);
+		}
+	} else if (val == 1) {
+		if (rotation_booster_val == 0) {
+			rotation_booster_on();
+			rotation_booster_val = val;
+		} else {
+			pr_info("%s: rotation_booster on request"
+				" is ignored\n", __func__);
+		}
+	} else {
+		pr_info("%s: rotation_booster request is invalid\n", __func__);
+	}
+
+	ret = n;
+out:
+	mutex_unlock(&rotation_booster_mutex);
+	return ret;
+}
+power_attr(rotation_booster);
+#else /* CONFIG_ROTATION_BOOSTER_SUPPORT */
+static inline void rotation_booster_on(void){}
+static inline void rotation_booster_off(void){}
+#endif /* CONFIG_ROTATION_BOOSTER_SUPPORT */
+
+#ifdef CONFIG_PEGASUS_GPU_LOCK
+static int mali_lock_val;
+static int mali_lock_cnt;
+DEFINE_MUTEX(mali_lock_mutex);
+
+static ssize_t mali_lock_show(struct kobject *kobj,
+					struct kobj_attribute *attr,
+					char *buf)
+{
+	return sprintf(buf, "level = %d, count = %d\n",
+			mali_lock_val, mali_lock_cnt);
+}
+
+static ssize_t mali_lock_store(struct kobject *kobj,
+					struct kobj_attribute *attr,
+					const char *buf, size_t n)
+{
+	int val;
+	ssize_t ret = -EINVAL;
+
+	mutex_lock(&mali_lock_mutex);
+
+	if (sscanf(buf, "%d", &val) != 1) {
+		pr_info("%s: Invalid mali lock format\n", __func__);
+		goto out;
+	}
+
+	if (val == 0) {	/* unlock */
+		mali_lock_cnt = mali_dvfs_bottom_lock_pop();
+		if (mali_lock_cnt == 0)
+			mali_lock_val = 0;
+	} else if (val > 0 && val < 4) { /* lock with level */
+		mali_lock_cnt = mali_dvfs_bottom_lock_push(val);
+		if (mali_lock_val < val)
+			mali_lock_val = val;
+	} else {
+		pr_info("%s: Lock request is invalid\n", __func__);
+	}
+
+	ret = n;
+out:
+	mutex_unlock(&mali_lock_mutex);
+	return ret;
+}
+power_attr(mali_lock);
+#endif
+
 static struct attribute * g[] = {
 	&state_attr.attr,
 #ifdef CONFIG_PM_TRACE
@@ -309,6 +711,24 @@ static struct attribute * g[] = {
 #ifdef CONFIG_PM_DEBUG
 	&pm_test_attr.attr,
 #endif
+#ifdef CONFIG_USER_WAKELOCK
+	&wake_lock_attr.attr,
+	&wake_unlock_attr.attr,
+#endif
+#endif
+#ifdef CONFIG_DVFS_LIMIT
+	&cpufreq_table_attr.attr,
+	&cpufreq_max_limit_attr.attr,
+	&cpufreq_min_limit_attr.attr,
+#endif
+#ifdef CONFIG_GPU_LOCK
+	&gpu_lock_attr.attr,
+#endif
+#ifdef CONFIG_PEGASUS_GPU_LOCK
+	&mali_lock_attr.attr,
+#endif
+#ifdef CONFIG_ROTATION_BOOSTER_SUPPORT
+	&rotation_booster_attr.attr,
 #endif
 	NULL,
 };
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 9a00a0a..474d75b 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -245,3 +245,45 @@ static inline void suspend_thaw_processes(void)
 {
 }
 #endif
+
+#ifdef CONFIG_WAKELOCK
+/* kernel/power/wakelock.c */
+extern struct workqueue_struct *suspend_work_queue;
+extern struct wake_lock main_wake_lock;
+extern struct workqueue_struct *sync_work_queue;
+extern struct wake_lock sync_wake_lock;
+extern suspend_state_t requested_suspend_state;
+#endif
+
+#ifdef CONFIG_USER_WAKELOCK
+ssize_t wake_lock_show(struct kobject *kobj, struct kobj_attribute *attr,
+			char *buf);
+ssize_t wake_lock_store(struct kobject *kobj, struct kobj_attribute *attr,
+			const char *buf, size_t n);
+ssize_t wake_unlock_show(struct kobject *kobj, struct kobj_attribute *attr,
+			char *buf);
+ssize_t  wake_unlock_store(struct kobject *kobj, struct kobj_attribute *attr,
+			const char *buf, size_t n);
+#endif
+
+#ifdef CONFIG_EARLYSUSPEND
+/* kernel/power/earlysuspend.c */
+void request_suspend_state(suspend_state_t state);
+suspend_state_t get_suspend_state(void);
+#endif
+
+struct pm_wd_data {
+	struct task_struct *tsk;
+	int timeout;
+};
+#ifdef CONFIG_PM_WATCHDOG_TIMEOUT
+void pm_wd_timeout(unsigned long data);
+void pm_wd_add_timer(struct timer_list *timer, struct pm_wd_data *data,
+			int timeout);
+void pm_wd_del_timer(struct timer_list *timer);
+#else
+static inline void pm_wd_timeout(unsigned long data) { }
+static inline void pm_wd_add_timer(struct timer_list *timer,
+				struct pm_wd_data *data, int timeout) { }
+static inline void pm_wd_del_timer(struct timer_list *timer) { }
+#endif
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 0cf3a27..31338cd 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -16,6 +16,7 @@
 #include <linux/freezer.h>
 #include <linux/delay.h>
 #include <linux/workqueue.h>
+#include <linux/wakelock.h>
 
 /* 
  * Timeout for stopping processes
@@ -82,6 +83,10 @@ static int try_to_freeze_tasks(bool sig_only)
 			todo += wq_busy;
 		}
 
+		if (todo && has_wake_lock(WAKE_LOCK_SUSPEND)) {
+			wakeup = 1;
+			break;
+		}
 		if (!todo || time_after(jiffies, end_time))
 			break;
 
@@ -108,19 +113,25 @@ static int try_to_freeze_tasks(bool sig_only)
 		 * and caller must call thaw_processes() if something fails),
 		 * but it cleans up leftover PF_FREEZE requests.
 		 */
-		printk("\n");
-		printk(KERN_ERR "Freezing of tasks %s after %d.%02d seconds "
-		       "(%d tasks refusing to freeze, wq_busy=%d):\n",
-		       wakeup ? "aborted" : "failed",
-		       elapsed_csecs / 100, elapsed_csecs % 100,
-		       todo - wq_busy, wq_busy);
-
+		if(wakeup) {
+			printk("\n");
+			printk(KERN_ERR "Freezing of %s aborted\n",
+					sig_only ? "user space " : "tasks ");
+		}
+		else {
+			printk("\n");
+			printk(KERN_ERR "Freezing of tasks failed after %d.%02d seconds "
+			       "(%d tasks refusing to freeze, wq_busy=%d):\n",
+			       elapsed_csecs / 100, elapsed_csecs % 100,
+			       todo - wq_busy, wq_busy);
+		}
 		thaw_workqueues();
 
 		read_lock(&tasklist_lock);
 		do_each_thread(g, p) {
 			task_lock(p);
-			if (!wakeup && freezing(p) && !freezer_should_skip(p))
+			if (freezing(p) && !freezer_should_skip(p) &&
+				elapsed_csecs > 100)
 				sched_show_task(p);
 			cancel_freezing(p);
 			task_unlock(p);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 06efa54..a45d501 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1272,6 +1272,79 @@ static unsigned long minimum_image_size(unsigned long saveable)
 	return saveable <= size ? 0 : saveable - size;
 }
 
+#ifdef CONFIG_FULL_PAGE_RECLAIM
+static int is_exist_entry(pgd_t *pgd, int i)
+{
+	pmd_t *pmd;
+
+	pgd = pgd+i;
+
+	if (pgd_none(*pgd))
+		return 0;
+
+	if (pgd_bad(*pgd))
+		return 0;
+
+	pmd = pmd_offset(pgd, 0);
+
+	if (pmd_none(*pmd))
+		return 0;
+
+	if (pmd_bad(*pmd))
+		return 0;
+
+	return 1;
+}
+
+static int show_process_pte_size(void)
+{
+	struct task_struct *p;
+	int i;
+	int count;
+	int tot_count = 0;
+	int kernel_did = 0;
+	int k_count = 0;
+	int task_struct_size = 0;
+
+	read_lock(&tasklist_lock);
+	for_each_process(p) {
+		count = 0;
+		task_struct_size += sizeof(struct task_struct);
+		if (p->comm[0] == '[') {
+			printk(KERN_DEBUG "%s skip\n", p->comm);
+			continue;
+		}
+		if (p->mm == NULL) {
+			printk(KERN_DEBUG "%s skip\n", p->comm);
+			continue;
+		}
+		if (p->mm->pgd == NULL)
+			continue;
+
+		for (i = 0; i < 1536; i++) {
+			if (is_exist_entry(p->mm->pgd, i))
+				count++;
+		}
+		if (!kernel_did) {
+			for (i = 1536; i < 2048; i++) {
+				if (is_exist_entry(p->mm->pgd, i))
+					k_count++;
+			}
+			kernel_did = 1;
+		}
+		printk(KERN_INFO "%s : pgd entry count = %d, size = %d K\n",
+					p->comm, count, (16 + count * 4));
+		tot_count = tot_count + (16 + count * 4);
+	}
+	printk(KERN_INFO "PAGE TABLE ==> total size = %d K , kernel = %d K\n",
+			tot_count, k_count * 4);
+	printk(KERN_INFO "task_struct_size = %d K\n", task_struct_size / 1024);
+	read_unlock(&tasklist_lock);
+
+	return 0;
+}
+#endif /* CONFIG_FULL_PAGE_RECLAIM */
+
 /**
  * hibernate_preallocate_memory - Preallocate memory for hibernation image
  *
@@ -1305,6 +1378,16 @@ int hibernate_preallocate_memory(void)
 	printk(KERN_INFO "PM: Preallocating image memory... ");
 	do_gettimeofday(&start);
 
+#ifdef CONFIG_FULL_PAGE_RECLAIM
+	/* First of all, throw out unnecessary page frames for saving */
+	do {
+		pages = shrink_all_memory(ULONG_MAX);
+		printk(KERN_INFO "\bdone (%lu pages freed)\n", pages);
+	/* shrink all pages */
+	} while (pages);
+	show_process_pte_size();
+#endif
+
 	error = memory_bm_create(&orig_bm, GFP_IMAGE, PG_ANY);
 	if (error)
 		goto err_out;
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 449ccc9..b0073be 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -28,6 +28,9 @@
 #include "power.h"
 
 const char *const pm_states[PM_SUSPEND_MAX] = {
+#ifdef CONFIG_EARLYSUSPEND
+	[PM_SUSPEND_ON]		= "on",
+#endif
 	[PM_SUSPEND_STANDBY]	= "standby",
 	[PM_SUSPEND_MEM]	= "mem",
 };
@@ -125,28 +128,41 @@ void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
 	local_irq_enable();
 }
 
+#if !defined(CONFIG_CPU_EXYNOS4210)
+#define CHECK_POINT printk(KERN_DEBUG "%s:%d\n", __func__, __LINE__)
+#else
+#define CHECK_POINT
+#endif
+
 /**
- *	suspend_enter - enter the desired system sleep state.
- *	@state:		state to enter
+ * suspend_enter - enter the desired system sleep state.
+ * @state: State to enter
+ * @wakeup: Returns information that suspend should not be entered again.
  *
- *	This function should be called after devices have been suspended.
+ * This function should be called after devices have been suspended.
  */
-static int suspend_enter(suspend_state_t state)
+static int suspend_enter(suspend_state_t state, bool *wakeup)
 {
 	int error;
 
+	CHECK_POINT;
+
 	if (suspend_ops->prepare) {
 		error = suspend_ops->prepare();
 		if (error)
 			goto Platform_finish;
 	}
 
+	CHECK_POINT;
+
 	error = dpm_suspend_noirq(PMSG_SUSPEND);
 	if (error) {
 		printk(KERN_ERR "PM: Some devices failed to power down\n");
 		goto Platform_finish;
 	}
 
+	CHECK_POINT;
+
 	if (suspend_ops->prepare_late) {
 		error = suspend_ops->prepare_late();
 		if (error)
@@ -160,12 +176,18 @@ static int suspend_enter(suspend_state_t state)
 	if (error || suspend_test(TEST_CPUS))
 		goto Enable_cpus;
 
+	CHECK_POINT;
+
 	arch_suspend_disable_irqs();
 	BUG_ON(!irqs_disabled());
 
 	error = syscore_suspend();
+
+	CHECK_POINT;
+
 	if (!error) {
-		if (!(suspend_test(TEST_CORE) || pm_wakeup_pending())) {
+		*wakeup = pm_wakeup_pending();
+		if (!(suspend_test(TEST_CORE) || *wakeup)) {
 			error = suspend_ops->enter(state);
 			events_check_enabled = false;
 		}
@@ -199,6 +221,7 @@ static int suspend_enter(suspend_state_t state)
 int suspend_devices_and_enter(suspend_state_t state)
 {
 	int error;
+	bool wakeup = false;
 
 	if (!suspend_ops)
 		return -ENOSYS;
@@ -220,7 +243,10 @@ int suspend_devices_and_enter(suspend_state_t state)
 	if (suspend_test(TEST_DEVICES))
 		goto Recover_platform;
 
-	error = suspend_enter(state);
+	do {
+		error = suspend_enter(state, &wakeup);
+	} while (!error && !wakeup
+		&& suspend_ops->suspend_again && suspend_ops->suspend_again());
 
  Resume_devices:
 	suspend_test_start();
@@ -253,6 +279,40 @@ static void suspend_finish(void)
 	pm_restore_console();
 }
 
+#ifdef CONFIG_PM_WATCHDOG_TIMEOUT
+void pm_wd_timeout(unsigned long data)
+{
+	struct pm_wd_data *wd_data = (void *)data;
+	struct task_struct *tsk = wd_data->tsk;
+
+	pr_emerg("%s: PM watchdog timeout: %d seconds\n",  __func__,
+			wd_data->timeout);
+
+	pr_emerg("stack:\n");
+	show_stack(tsk, NULL);
+
+	BUG();
+}
+
+void pm_wd_add_timer(struct timer_list *timer, struct pm_wd_data *data,
+			int timeout)
+{
+	data->timeout = timeout;
+	data->tsk = get_current();
+	init_timer_on_stack(timer);
+	timer->expires = jiffies + HZ * data->timeout;
+	timer->function = pm_wd_timeout;
+	timer->data = (unsigned long)data;
+	add_timer(timer);
+}
+
+void pm_wd_del_timer(struct timer_list *timer)
+{
+	del_timer_sync(timer);
+	destroy_timer_on_stack(timer);
+}
+#endif
+
 /**
  *	enter_state - Do common work of entering low-power state.
  *	@state:		pm_state structure for state we're entering.
@@ -266,6 +326,8 @@ static void suspend_finish(void)
 int enter_state(suspend_state_t state)
 {
 	int error;
+	struct timer_list timer;
+	struct pm_wd_data data;
 
 	if (!valid_state(state))
 		return -ENODEV;
@@ -291,8 +353,12 @@ int enter_state(suspend_state_t state)
 	pm_restore_gfp_mask();
 
  Finish:
+	pm_wd_add_timer(&timer, &data, 15);
+
 	pr_debug("PM: Finishing wakeup.\n");
 	suspend_finish();
+
+	pm_wd_del_timer(&timer);
  Unlock:
 	mutex_unlock(&pm_mutex);
 	return error;
diff --git a/kernel/power/suspend_time.c b/kernel/power/suspend_time.c
new file mode 100644
index 0000000..d2a65da
--- /dev/null
+++ b/kernel/power/suspend_time.c
@@ -0,0 +1,111 @@
+/*
+ * debugfs file to track time spent in suspend
+ *
+ * Copyright (c) 2011, Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/seq_file.h>
+#include <linux/syscore_ops.h>
+#include <linux/time.h>
+
+static struct timespec suspend_time_before;
+static unsigned int time_in_suspend_bins[32];
+
+#ifdef CONFIG_DEBUG_FS
+static int suspend_time_debug_show(struct seq_file *s, void *data)
+{
+	int bin;
+	seq_printf(s, "time (secs)  count\n");
+	seq_printf(s, "------------------\n");
+	for (bin = 0; bin < 32; bin++) {
+		if (time_in_suspend_bins[bin] == 0)
+			continue;
+		seq_printf(s, "%4d - %4d %4u\n",
+			bin ? 1 << (bin - 1) : 0, 1 << bin,
+				time_in_suspend_bins[bin]);
+	}
+	return 0;
+}
+
+static int suspend_time_debug_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, suspend_time_debug_show, NULL);
+}
+
+static const struct file_operations suspend_time_debug_fops = {
+	.open		= suspend_time_debug_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static int __init suspend_time_debug_init(void)
+{
+	struct dentry *d;
+
+	d = debugfs_create_file("suspend_time", 0755, NULL, NULL,
+		&suspend_time_debug_fops);
+	if (!d) {
+		pr_err("Failed to create suspend_time debug file\n");
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+late_initcall(suspend_time_debug_init);
+#endif
+
+static int suspend_time_syscore_suspend(void)
+{
+	read_persistent_clock(&suspend_time_before);
+
+	return 0;
+}
+
+static void suspend_time_syscore_resume(void)
+{
+	struct timespec after;
+
+	read_persistent_clock(&after);
+
+	after = timespec_sub(after, suspend_time_before);
+
+	time_in_suspend_bins[fls(after.tv_sec)]++;
+
+	pr_info("Suspended for %lu.%03lu seconds\n", after.tv_sec,
+		after.tv_nsec / NSEC_PER_MSEC);
+}
+
+static struct syscore_ops suspend_time_syscore_ops = {
+	.suspend = suspend_time_syscore_suspend,
+	.resume = suspend_time_syscore_resume,
+};
+
+static int suspend_time_syscore_init(void)
+{
+	register_syscore_ops(&suspend_time_syscore_ops);
+
+	return 0;
+}
+
+static void suspend_time_syscore_exit(void)
+{
+	unregister_syscore_ops(&suspend_time_syscore_ops);
+}
+module_init(suspend_time_syscore_init);
+module_exit(suspend_time_syscore_exit);
diff --git a/kernel/power/userwakelock.c b/kernel/power/userwakelock.c
new file mode 100644
index 0000000..a28a8db
--- /dev/null
+++ b/kernel/power/userwakelock.c
@@ -0,0 +1,219 @@
+/* kernel/power/userwakelock.c
+ *
+ * Copyright (C) 2005-2008 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/ctype.h>
+#include <linux/module.h>
+#include <linux/wakelock.h>
+#include <linux/slab.h>
+
+#include "power.h"
+
+enum {
+	DEBUG_FAILURE	= BIT(0),
+	DEBUG_ERROR	= BIT(1),
+	DEBUG_NEW	= BIT(2),
+	DEBUG_ACCESS	= BIT(3),
+	DEBUG_LOOKUP	= BIT(4),
+};
+static int debug_mask = DEBUG_FAILURE;
+module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
+
+static DEFINE_MUTEX(tree_lock);
+
+struct user_wake_lock {
+	struct rb_node		node;
+	struct wake_lock	wake_lock;
+	char			name[0];
+};
+struct rb_root user_wake_locks;
+
+static struct user_wake_lock *lookup_wake_lock_name(
+	const char *buf, int allocate, long *timeoutptr)
+{
+	struct rb_node **p = &user_wake_locks.rb_node;
+	struct rb_node *parent = NULL;
+	struct user_wake_lock *l;
+	int diff;
+	u64 timeout;
+	int name_len;
+	const char *arg;
+
+	/* Find length of lock name and start of optional timeout string */
+	arg = buf;
+	while (*arg && !isspace(*arg))
+		arg++;
+	name_len = arg - buf;
+	if (!name_len)
+		goto bad_arg;
+	while (isspace(*arg))
+		arg++;
+
+	/* Process timeout string */
+	if (timeoutptr && *arg) {
+		timeout = simple_strtoull(arg, (char **)&arg, 0);
+		while (isspace(*arg))
+			arg++;
+		if (*arg)
+			goto bad_arg;
+		/* convert timeout from nanoseconds to jiffies > 0 */
+		timeout += (NSEC_PER_SEC / HZ) - 1;
+		do_div(timeout, (NSEC_PER_SEC / HZ));
+		if (timeout <= 0)
+			timeout = 1;
+		*timeoutptr = timeout;
+	} else if (*arg)
+		goto bad_arg;
+	else if (timeoutptr)
+		*timeoutptr = 0;
+
+	/* Lookup wake lock in rbtree */
+	while (*p) {
+		parent = *p;
+		l = rb_entry(parent, struct user_wake_lock, node);
+		diff = strncmp(buf, l->name, name_len);
+		if (!diff && l->name[name_len])
+			diff = -1;
+		if (debug_mask & DEBUG_ERROR)
+			pr_info("lookup_wake_lock_name: compare %.*s %s %d\n",
+				name_len, buf, l->name, diff);
+
+		if (diff < 0)
+			p = &(*p)->rb_left;
+		else if (diff > 0)
+			p = &(*p)->rb_right;
+		else
+			return l;
+	}
+
+	/* Allocate and add new wakelock to rbtree */
+	if (!allocate) {
+		if (debug_mask & DEBUG_ERROR)
+			pr_info("lookup_wake_lock_name: %.*s not found\n",
+				name_len, buf);
+		return ERR_PTR(-EINVAL);
+	}
+	l = kzalloc(sizeof(*l) + name_len + 1, GFP_KERNEL);
+	if (l == NULL) {
+		if (debug_mask & DEBUG_FAILURE)
+			pr_err("lookup_wake_lock_name: failed to allocate "
+				"memory for %.*s\n", name_len, buf);
+		return ERR_PTR(-ENOMEM);
+	}
+	memcpy(l->name, buf, name_len);
+	if (debug_mask & DEBUG_NEW)
+		pr_info("lookup_wake_lock_name: new wake lock %s\n", l->name);
+	wake_lock_init(&l->wake_lock, WAKE_LOCK_SUSPEND, l->name);
+	rb_link_node(&l->node, parent, p);
+	rb_insert_color(&l->node, &user_wake_locks);
+	return l;
+
+bad_arg:
+	if (debug_mask & DEBUG_ERROR)
+		pr_info("lookup_wake_lock_name: wake lock, %.*s, bad arg, %s\n",
+			name_len, buf, arg);
+	return ERR_PTR(-EINVAL);
+}
+
+ssize_t wake_lock_show(
+	struct kobject *kobj, struct kobj_attribute *attr, char *buf)
+{
+	char *s = buf;
+	char *end = buf + PAGE_SIZE;
+	struct rb_node *n;
+	struct user_wake_lock *l;
+
+	mutex_lock(&tree_lock);
+
+	for (n = rb_first(&user_wake_locks); n != NULL; n = rb_next(n)) {
+		l = rb_entry(n, struct user_wake_lock, node);
+		if (wake_lock_active(&l->wake_lock))
+			s += scnprintf(s, end - s, "%s ", l->name);
+	}
+	s += scnprintf(s, end - s, "\n");
+
+	mutex_unlock(&tree_lock);
+	return (s - buf);
+}
+
+ssize_t wake_lock_store(
+	struct kobject *kobj, struct kobj_attribute *attr,
+	const char *buf, size_t n)
+{
+	long timeout;
+	struct user_wake_lock *l;
+
+	mutex_lock(&tree_lock);
+	l = lookup_wake_lock_name(buf, 1, &timeout);
+	if (IS_ERR(l)) {
+		n = PTR_ERR(l);
+		goto bad_name;
+	}
+
+	if (debug_mask & DEBUG_ACCESS)
+		pr_info("wake_lock_store: %s, timeout %ld\n", l->name, timeout);
+
+	if (timeout)
+		wake_lock_timeout(&l->wake_lock, timeout);
+	else
+		wake_lock(&l->wake_lock);
+bad_name:
+	mutex_unlock(&tree_lock);
+	return n;
+}
+
+
+ssize_t wake_unlock_show(
+	struct kobject *kobj, struct kobj_attribute *attr, char *buf)
+{
+	char *s = buf;
+	char *end = buf + PAGE_SIZE;
+	struct rb_node *n;
+	struct user_wake_lock *l;
+
+	mutex_lock(&tree_lock);
+
+	for (n = rb_first(&user_wake_locks); n != NULL; n = rb_next(n)) {
+		l = rb_entry(n, struct user_wake_lock, node);
+		if (!wake_lock_active(&l->wake_lock))
+			s += scnprintf(s, end - s, "%s ", l->name);
+	}
+	s += scnprintf(s, end - s, "\n");
+
+	mutex_unlock(&tree_lock);
+	return (s - buf);
+}
+
+ssize_t wake_unlock_store(
+	struct kobject *kobj, struct kobj_attribute *attr,
+	const char *buf, size_t n)
+{
+	struct user_wake_lock *l;
+
+	mutex_lock(&tree_lock);
+	l = lookup_wake_lock_name(buf, 0, NULL);
+	if (IS_ERR(l)) {
+		n = PTR_ERR(l);
+		goto not_found;
+	}
+
+	if (debug_mask & DEBUG_ACCESS)
+		pr_info("wake_unlock_store: %s\n", l->name);
+
+	wake_unlock(&l->wake_lock);
+not_found:
+	mutex_unlock(&tree_lock);
+	return n;
+}
+
diff --git a/kernel/power/wakelock.c b/kernel/power/wakelock.c
new file mode 100644
index 0000000..b2e149a
--- /dev/null
+++ b/kernel/power/wakelock.c
@@ -0,0 +1,658 @@
+/* kernel/power/wakelock.c
+ *
+ * Copyright (C) 2005-2008 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/suspend.h>
+#include <linux/syscalls.h> /* sys_sync */
+#include <linux/wakelock.h>
+#ifdef CONFIG_WAKELOCK_STAT
+#include <linux/proc_fs.h>
+#endif
+#include "power.h"
+
+enum {
+	DEBUG_EXIT_SUSPEND = 1U << 0,
+	DEBUG_WAKEUP = 1U << 1,
+	DEBUG_SUSPEND = 1U << 2,
+	DEBUG_EXPIRE = 1U << 3,
+	DEBUG_WAKE_LOCK = 1U << 4,
+};
+static int debug_mask = DEBUG_EXIT_SUSPEND | DEBUG_WAKEUP | DEBUG_SUSPEND;
+module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
+
+#define WAKE_LOCK_TYPE_MASK              (0x0f)
+#define WAKE_LOCK_INITIALIZED            (1U << 8)
+#define WAKE_LOCK_ACTIVE                 (1U << 9)
+#define WAKE_LOCK_AUTO_EXPIRE            (1U << 10)
+#define WAKE_LOCK_PREVENTING_SUSPEND     (1U << 11)
+
+static DEFINE_SPINLOCK(list_lock);
+static LIST_HEAD(inactive_locks);
+static struct list_head active_wake_locks[WAKE_LOCK_TYPE_COUNT];
+static int current_event_num;
+struct workqueue_struct *suspend_work_queue;
+struct workqueue_struct *sync_work_queue;
+struct wake_lock main_wake_lock;
+struct wake_lock sync_wake_lock;
+suspend_state_t requested_suspend_state = PM_SUSPEND_MEM;
+static struct wake_lock unknown_wakeup;
+static struct wake_lock suspend_backoff_lock;
+
+#define SUSPEND_BACKOFF_THRESHOLD	10
+#define SUSPEND_BACKOFF_INTERVAL	10000
+
+static unsigned suspend_short_count;
+
+#ifdef CONFIG_WAKELOCK_STAT
+static struct wake_lock deleted_wake_locks;
+static ktime_t last_sleep_time_update;
+static int wait_for_wakeup;
+
+int get_expired_time(struct wake_lock *lock, ktime_t *expire_time)
+{
+	struct timespec ts;
+	struct timespec kt;
+	struct timespec tomono;
+	struct timespec delta;
+	struct timespec sleep;
+	long timeout;
+
+	if (!(lock->flags & WAKE_LOCK_AUTO_EXPIRE))
+		return 0;
+	get_xtime_and_monotonic_and_sleep_offset(&kt, &tomono, &sleep);
+	timeout = lock->expires - jiffies;
+	if (timeout > 0)
+		return 0;
+	jiffies_to_timespec(-timeout, &delta);
+	set_normalized_timespec(&ts, kt.tv_sec + tomono.tv_sec - delta.tv_sec,
+				kt.tv_nsec + tomono.tv_nsec - delta.tv_nsec);
+	*expire_time = timespec_to_ktime(ts);
+	return 1;
+}
+
+
+static int print_lock_stat(struct seq_file *m, struct wake_lock *lock)
+{
+	int lock_count = lock->stat.count;
+	int expire_count = lock->stat.expire_count;
+	ktime_t active_time = ktime_set(0, 0);
+	ktime_t total_time = lock->stat.total_time;
+	ktime_t max_time = lock->stat.max_time;
+
+	ktime_t prevent_suspend_time = lock->stat.prevent_suspend_time;
+	if (lock->flags & WAKE_LOCK_ACTIVE) {
+		ktime_t now, add_time;
+		int expired = get_expired_time(lock, &now);
+		if (!expired)
+			now = ktime_get();
+		add_time = ktime_sub(now, lock->stat.last_time);
+		lock_count++;
+		if (!expired)
+			active_time = add_time;
+		else
+			expire_count++;
+		total_time = ktime_add(total_time, add_time);
+		if (lock->flags & WAKE_LOCK_PREVENTING_SUSPEND)
+			prevent_suspend_time = ktime_add(prevent_suspend_time,
+					ktime_sub(now, last_sleep_time_update));
+		if (add_time.tv64 > max_time.tv64)
+			max_time = add_time;
+	}
+
+	return seq_printf(m,
+		     "\"%s\"\t%d\t%d\t%d\t%lld\t%lld\t%lld\t%lld\t%lld\n",
+		     lock->name, lock_count, expire_count,
+		     lock->stat.wakeup_count, ktime_to_ns(active_time),
+		     ktime_to_ns(total_time),
+		     ktime_to_ns(prevent_suspend_time), ktime_to_ns(max_time),
+		     ktime_to_ns(lock->stat.last_time));
+}
+
+static int wakelock_stats_show(struct seq_file *m, void *unused)
+{
+	unsigned long irqflags;
+	struct wake_lock *lock;
+	int ret;
+	int type;
+
+	spin_lock_irqsave(&list_lock, irqflags);
+
+	ret = seq_puts(m, "name\tcount\texpire_count\twake_count\tactive_since"
+			"\ttotal_time\tsleep_time\tmax_time\tlast_change\n");
+	list_for_each_entry(lock, &inactive_locks, link)
+		ret = print_lock_stat(m, lock);
+	for (type = 0; type < WAKE_LOCK_TYPE_COUNT; type++) {
+		list_for_each_entry(lock, &active_wake_locks[type], link)
+			ret = print_lock_stat(m, lock);
+	}
+	spin_unlock_irqrestore(&list_lock, irqflags);
+	return 0;
+}
+
+static void wake_unlock_stat_locked(struct wake_lock *lock, int expired)
+{
+	ktime_t duration;
+	ktime_t now;
+	if (!(lock->flags & WAKE_LOCK_ACTIVE))
+		return;
+	if (get_expired_time(lock, &now))
+		expired = 1;
+	else
+		now = ktime_get();
+	lock->stat.count++;
+	if (expired)
+		lock->stat.expire_count++;
+	duration = ktime_sub(now, lock->stat.last_time);
+	lock->stat.total_time = ktime_add(lock->stat.total_time, duration);
+	if (ktime_to_ns(duration) > ktime_to_ns(lock->stat.max_time))
+		lock->stat.max_time = duration;
+	lock->stat.last_time = ktime_get();
+	if (lock->flags & WAKE_LOCK_PREVENTING_SUSPEND) {
+		duration = ktime_sub(now, last_sleep_time_update);
+		lock->stat.prevent_suspend_time = ktime_add(
+			lock->stat.prevent_suspend_time, duration);
+		lock->flags &= ~WAKE_LOCK_PREVENTING_SUSPEND;
+	}
+}
+
+static void update_sleep_wait_stats_locked(int done)
+{
+	struct wake_lock *lock;
+	ktime_t now, etime, elapsed, add;
+	int expired;
+
+	now = ktime_get();
+	elapsed = ktime_sub(now, last_sleep_time_update);
+	list_for_each_entry(lock, &active_wake_locks[WAKE_LOCK_SUSPEND], link) {
+		expired = get_expired_time(lock, &etime);
+		if (lock->flags & WAKE_LOCK_PREVENTING_SUSPEND) {
+			if (expired)
+				add = ktime_sub(etime, last_sleep_time_update);
+			else
+				add = elapsed;
+			lock->stat.prevent_suspend_time = ktime_add(
+				lock->stat.prevent_suspend_time, add);
+		}
+		if (done || expired)
+			lock->flags &= ~WAKE_LOCK_PREVENTING_SUSPEND;
+		else
+			lock->flags |= WAKE_LOCK_PREVENTING_SUSPEND;
+	}
+	last_sleep_time_update = now;
+}
+#endif
+
+
+static void expire_wake_lock(struct wake_lock *lock)
+{
+#ifdef CONFIG_WAKELOCK_STAT
+	wake_unlock_stat_locked(lock, 1);
+#endif
+	lock->flags &= ~(WAKE_LOCK_ACTIVE | WAKE_LOCK_AUTO_EXPIRE);
+	list_del(&lock->link);
+	list_add(&lock->link, &inactive_locks);
+	if (debug_mask & (DEBUG_WAKE_LOCK | DEBUG_EXPIRE))
+		pr_info("expired wake lock %s\n", lock->name);
+}
+
+/* Caller must acquire the list_lock spinlock */
+static void print_active_locks(int type)
+{
+	struct wake_lock *lock;
+	bool print_expired = true;
+
+	BUG_ON(type >= WAKE_LOCK_TYPE_COUNT);
+	list_for_each_entry(lock, &active_wake_locks[type], link) {
+		if (lock->flags & WAKE_LOCK_AUTO_EXPIRE) {
+			long timeout = lock->expires - jiffies;
+			if (timeout > 0)
+				pr_info("active wake lock %s, time left %ld\n",
+					lock->name, timeout);
+			else if (print_expired)
+				pr_info("wake lock %s, expired\n", lock->name);
+		} else {
+			pr_info("active wake lock %s\n", lock->name);
+			if (!(debug_mask & DEBUG_EXPIRE))
+				print_expired = false;
+		}
+	}
+}
+
+static long has_wake_lock_locked(int type)
+{
+	struct wake_lock *lock, *n;
+	long max_timeout = 0;
+
+	BUG_ON(type >= WAKE_LOCK_TYPE_COUNT);
+	list_for_each_entry_safe(lock, n, &active_wake_locks[type], link) {
+		if (lock->flags & WAKE_LOCK_AUTO_EXPIRE) {
+			long timeout = lock->expires - jiffies;
+			if (timeout <= 0)
+				expire_wake_lock(lock);
+			else if (timeout > max_timeout)
+				max_timeout = timeout;
+		} else
+			return -1;
+	}
+	return max_timeout;
+}
+
+long has_wake_lock(int type)
+{
+	long ret;
+	unsigned long irqflags;
+	spin_lock_irqsave(&list_lock, irqflags);
+	ret = has_wake_lock_locked(type);
+	if (ret && (debug_mask & DEBUG_WAKEUP) && type == WAKE_LOCK_SUSPEND)
+		print_active_locks(type);
+	spin_unlock_irqrestore(&list_lock, irqflags);
+	return ret;
+}
+
+static void suspend_backoff(void)
+{
+	pr_info("suspend: too many immediate wakeups, back off\n");
+	wake_lock_timeout(&suspend_backoff_lock,
+			  msecs_to_jiffies(SUSPEND_BACKOFF_INTERVAL));
+}
+
+static void suspend(struct work_struct *work)
+{
+	int ret;
+	int entry_event_num;
+	struct timespec ts_entry, ts_exit;
+
+	if (has_wake_lock(WAKE_LOCK_SUSPEND)) {
+		if (debug_mask & DEBUG_SUSPEND)
+			pr_info("suspend: abort suspend\n");
+		return;
+	}
+
+	entry_event_num = current_event_num;
+	sys_sync();
+	if (debug_mask & DEBUG_SUSPEND)
+		pr_info("suspend: enter suspend\n");
+	getnstimeofday(&ts_entry);
+
+	if (debug_mask & DEBUG_EXIT_SUSPEND) {
+		struct rtc_time tm;
+		rtc_time_to_tm(ts_entry.tv_sec, &tm);
+		pr_info("suspend: enter suspend, "
+			"(%d-%02d-%02d %02d:%02d:%02d.%09lu UTC)\n",
+			tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
+			tm.tm_hour, tm.tm_min, tm.tm_sec, ts_entry.tv_nsec);
+	}
+
+	ret = pm_suspend(requested_suspend_state);
+	getnstimeofday(&ts_exit);
+
+	if (debug_mask & DEBUG_EXIT_SUSPEND) {
+		struct rtc_time tm;
+		rtc_time_to_tm(ts_exit.tv_sec, &tm);
+		pr_info("suspend: exit suspend, ret = %d "
+			"(%d-%02d-%02d %02d:%02d:%02d.%09lu UTC)\n", ret,
+			tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
+			tm.tm_hour, tm.tm_min, tm.tm_sec, ts_exit.tv_nsec);
+	}
+
+	if (ts_exit.tv_sec - ts_entry.tv_sec <= 1) {
+		++suspend_short_count;
+
+		if (suspend_short_count == SUSPEND_BACKOFF_THRESHOLD) {
+			suspend_backoff();
+			suspend_short_count = 0;
+		}
+	} else {
+		suspend_short_count = 0;
+	}
+
+	if (current_event_num == entry_event_num) {
+		if (debug_mask & DEBUG_SUSPEND)
+			pr_info("suspend: pm_suspend returned with no event\n");
+		wake_lock_timeout(&unknown_wakeup, HZ / 2);
+	}
+}
+static DECLARE_WORK(suspend_work, suspend);
+
+static void expire_wake_locks(unsigned long data)
+{
+	long has_lock;
+	unsigned long irqflags;
+	if (debug_mask & DEBUG_EXPIRE)
+		pr_info("expire_wake_locks: start\n");
+	spin_lock_irqsave(&list_lock, irqflags);
+	if (debug_mask & DEBUG_SUSPEND)
+		print_active_locks(WAKE_LOCK_SUSPEND);
+	has_lock = has_wake_lock_locked(WAKE_LOCK_SUSPEND);
+	if (debug_mask & DEBUG_EXPIRE)
+		pr_info("expire_wake_locks: done, has_lock %ld\n", has_lock);
+	if (has_lock == 0)
+		queue_work(suspend_work_queue, &suspend_work);
+	spin_unlock_irqrestore(&list_lock, irqflags);
+}
+static DEFINE_TIMER(expire_timer, expire_wake_locks, 0, 0);
+
+static int power_suspend_late(struct device *dev)
+{
+	int ret = has_wake_lock(WAKE_LOCK_SUSPEND) ? -EAGAIN : 0;
+#ifdef CONFIG_WAKELOCK_STAT
+	wait_for_wakeup = !ret;
+#endif
+	if (debug_mask & DEBUG_SUSPEND)
+		pr_info("power_suspend_late return %d\n", ret);
+	return ret;
+}
+
+static struct dev_pm_ops power_driver_pm_ops = {
+	.suspend_noirq = power_suspend_late,
+};
+
+static struct platform_driver power_driver = {
+	.driver.name = "power",
+	.driver.pm = &power_driver_pm_ops,
+};
+static struct platform_device power_device = {
+	.name = "power",
+};
+
+void wake_lock_init(struct wake_lock *lock, int type, const char *name)
+{
+	unsigned long irqflags = 0;
+
+	if (name)
+		lock->name = name;
+	BUG_ON(!lock->name);
+
+	if (debug_mask & DEBUG_WAKE_LOCK)
+		pr_info("wake_lock_init name=%s\n", lock->name);
+#ifdef CONFIG_WAKELOCK_STAT
+	lock->stat.count = 0;
+	lock->stat.expire_count = 0;
+	lock->stat.wakeup_count = 0;
+	lock->stat.total_time = ktime_set(0, 0);
+	lock->stat.prevent_suspend_time = ktime_set(0, 0);
+	lock->stat.max_time = ktime_set(0, 0);
+	lock->stat.last_time = ktime_set(0, 0);
+#endif
+	lock->flags = (type & WAKE_LOCK_TYPE_MASK) | WAKE_LOCK_INITIALIZED;
+
+	INIT_LIST_HEAD(&lock->link);
+	spin_lock_irqsave(&list_lock, irqflags);
+	list_add(&lock->link, &inactive_locks);
+	spin_unlock_irqrestore(&list_lock, irqflags);
+}
+EXPORT_SYMBOL(wake_lock_init);
+
+void wake_lock_destroy(struct wake_lock *lock)
+{
+	unsigned long irqflags;
+	if (debug_mask & DEBUG_WAKE_LOCK)
+		pr_info("wake_lock_destroy name=%s\n", lock->name);
+	spin_lock_irqsave(&list_lock, irqflags);
+	lock->flags &= ~WAKE_LOCK_INITIALIZED;
+#ifdef CONFIG_WAKELOCK_STAT
+	if (lock->stat.count) {
+		deleted_wake_locks.stat.count += lock->stat.count;
+		deleted_wake_locks.stat.expire_count += lock->stat.expire_count;
+		deleted_wake_locks.stat.total_time =
+			ktime_add(deleted_wake_locks.stat.total_time,
+				  lock->stat.total_time);
+		deleted_wake_locks.stat.prevent_suspend_time =
+			ktime_add(deleted_wake_locks.stat.prevent_suspend_time,
+				  lock->stat.prevent_suspend_time);
+		deleted_wake_locks.stat.max_time =
+			ktime_add(deleted_wake_locks.stat.max_time,
+				  lock->stat.max_time);
+	}
+#endif
+	list_del(&lock->link);
+	spin_unlock_irqrestore(&list_lock, irqflags);
+}
+EXPORT_SYMBOL(wake_lock_destroy);
+
+static void wake_lock_internal(
+	struct wake_lock *lock, long timeout, int has_timeout)
+{
+	int type;
+	unsigned long irqflags;
+	long expire_in;
+
+	spin_lock_irqsave(&list_lock, irqflags);
+	type = lock->flags & WAKE_LOCK_TYPE_MASK;
+	BUG_ON(type >= WAKE_LOCK_TYPE_COUNT);
+	BUG_ON(!(lock->flags & WAKE_LOCK_INITIALIZED));
+#ifdef CONFIG_WAKELOCK_STAT
+	if (type == WAKE_LOCK_SUSPEND && wait_for_wakeup) {
+		if (debug_mask & DEBUG_WAKEUP)
+			pr_info("wakeup wake lock: %s\n", lock->name);
+		wait_for_wakeup = 0;
+		lock->stat.wakeup_count++;
+	}
+	if ((lock->flags & WAKE_LOCK_AUTO_EXPIRE) &&
+	    (long)(lock->expires - jiffies) <= 0) {
+		wake_unlock_stat_locked(lock, 0);
+		lock->stat.last_time = ktime_get();
+	}
+#endif
+	if (!(lock->flags & WAKE_LOCK_ACTIVE)) {
+		lock->flags |= WAKE_LOCK_ACTIVE;
+#ifdef CONFIG_WAKELOCK_STAT
+		lock->stat.last_time = ktime_get();
+#endif
+	}
+	list_del(&lock->link);
+	if (has_timeout) {
+		if (debug_mask & DEBUG_WAKE_LOCK)
+			pr_info("wake_lock: %s, type %d, timeout %ld.%03lu\n",
+				lock->name, type, timeout / HZ,
+				(timeout % HZ) * MSEC_PER_SEC / HZ);
+		lock->expires = jiffies + timeout;
+		lock->flags |= WAKE_LOCK_AUTO_EXPIRE;
+		list_add_tail(&lock->link, &active_wake_locks[type]);
+	} else {
+		if (debug_mask & DEBUG_WAKE_LOCK)
+			pr_info("wake_lock: %s, type %d\n", lock->name, type);
+		lock->expires = LONG_MAX;
+		lock->flags &= ~WAKE_LOCK_AUTO_EXPIRE;
+		list_add(&lock->link, &active_wake_locks[type]);
+	}
+	if (type == WAKE_LOCK_SUSPEND) {
+		current_event_num++;
+#ifdef CONFIG_WAKELOCK_STAT
+		if (lock == &main_wake_lock)
+			update_sleep_wait_stats_locked(1);
+		else if (!wake_lock_active(&main_wake_lock))
+			update_sleep_wait_stats_locked(0);
+#endif
+		if (has_timeout)
+			expire_in = has_wake_lock_locked(type);
+		else
+			expire_in = -1;
+		if (expire_in > 0) {
+			if (debug_mask & DEBUG_EXPIRE)
+				pr_info("wake_lock: %s, start expire timer, "
+					"%ld\n", lock->name, expire_in);
+			mod_timer(&expire_timer, jiffies + expire_in);
+		} else {
+			if (del_timer(&expire_timer))
+				if (debug_mask & DEBUG_EXPIRE)
+					pr_info("wake_lock: %s, stop expire timer\n",
+						lock->name);
+			if (expire_in == 0)
+				queue_work(suspend_work_queue, &suspend_work);
+		}
+	}
+	spin_unlock_irqrestore(&list_lock, irqflags);
+}
+
+void wake_lock(struct wake_lock *lock)
+{
+	wake_lock_internal(lock, 0, 0);
+}
+EXPORT_SYMBOL(wake_lock);
+
+void wake_lock_timeout(struct wake_lock *lock, long timeout)
+{
+	wake_lock_internal(lock, timeout, 1);
+}
+EXPORT_SYMBOL(wake_lock_timeout);
+
+void wake_unlock(struct wake_lock *lock)
+{
+	int type;
+	unsigned long irqflags;
+	spin_lock_irqsave(&list_lock, irqflags);
+	type = lock->flags & WAKE_LOCK_TYPE_MASK;
+#ifdef CONFIG_WAKELOCK_STAT
+	wake_unlock_stat_locked(lock, 0);
+#endif
+	if (debug_mask & DEBUG_WAKE_LOCK)
+		pr_info("wake_unlock: %s\n", lock->name);
+	lock->flags &= ~(WAKE_LOCK_ACTIVE | WAKE_LOCK_AUTO_EXPIRE);
+	list_del(&lock->link);
+	list_add(&lock->link, &inactive_locks);
+	if (type == WAKE_LOCK_SUSPEND) {
+		long has_lock = has_wake_lock_locked(type);
+		if (has_lock > 0) {
+			if (debug_mask & DEBUG_EXPIRE)
+				pr_info("wake_unlock: %s, start expire timer, "
+					"%ld\n", lock->name, has_lock);
+			mod_timer(&expire_timer, jiffies + has_lock);
+		} else {
+			if (del_timer(&expire_timer))
+				if (debug_mask & DEBUG_EXPIRE)
+					pr_info("wake_unlock: %s, stop expire "
+						"timer\n", lock->name);
+			if (has_lock == 0)
+				queue_work(suspend_work_queue, &suspend_work);
+		}
+		if (lock == &main_wake_lock) {
+			if (debug_mask & DEBUG_SUSPEND)
+				print_active_locks(WAKE_LOCK_SUSPEND);
+#ifdef CONFIG_WAKELOCK_STAT
+			update_sleep_wait_stats_locked(0);
+#endif
+		}
+	}
+	spin_unlock_irqrestore(&list_lock, irqflags);
+}
+EXPORT_SYMBOL(wake_unlock);
+
+int wake_lock_active(struct wake_lock *lock)
+{
+	return !!(lock->flags & WAKE_LOCK_ACTIVE);
+}
+EXPORT_SYMBOL(wake_lock_active);
+
+static int wakelock_stats_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, wakelock_stats_show, NULL);
+}
+
+static const struct file_operations wakelock_stats_fops = {
+	.owner = THIS_MODULE,
+	.open = wakelock_stats_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static int __init wakelocks_init(void)
+{
+	int ret;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(active_wake_locks); i++)
+		INIT_LIST_HEAD(&active_wake_locks[i]);
+
+#ifdef CONFIG_WAKELOCK_STAT
+	wake_lock_init(&deleted_wake_locks, WAKE_LOCK_SUSPEND,
+			"deleted_wake_locks");
+#endif
+	wake_lock_init(&main_wake_lock, WAKE_LOCK_SUSPEND, "main");
+	wake_lock_init(&sync_wake_lock, WAKE_LOCK_SUSPEND, "sync_system");
+	wake_lock(&main_wake_lock);
+	wake_lock_init(&unknown_wakeup, WAKE_LOCK_SUSPEND, "unknown_wakeups");
+	wake_lock_init(&suspend_backoff_lock, WAKE_LOCK_SUSPEND,
+		       "suspend_backoff");
+
+	ret = platform_device_register(&power_device);
+	if (ret) {
+		pr_err("wakelocks_init: platform_device_register failed\n");
+		goto err_platform_device_register;
+	}
+	ret = platform_driver_register(&power_driver);
+	if (ret) {
+		pr_err("wakelocks_init: platform_driver_register failed\n");
+		goto err_platform_driver_register;
+	}
+
+	suspend_work_queue = alloc_workqueue("suspend", WQ_HIGHPRI, 0);
+	if (suspend_work_queue == NULL) {
+		ret = -ENOMEM;
+		goto err_suspend_work_queue;
+	}
+
+	sync_work_queue = create_singlethread_workqueue("sync_system_work");
+	if (sync_work_queue == NULL) {
+		ret = -ENOMEM;
+		goto err_sync_work_queue;
+	}
+
+#ifdef CONFIG_WAKELOCK_STAT
+	proc_create("wakelocks", S_IRUGO, NULL, &wakelock_stats_fops);
+#endif
+
+	return 0;
+
+err_sync_work_queue:
+	destroy_workqueue(suspend_work_queue);
+err_suspend_work_queue:
+	platform_driver_unregister(&power_driver);
+err_platform_driver_register:
+	platform_device_unregister(&power_device);
+err_platform_device_register:
+	wake_lock_destroy(&suspend_backoff_lock);
+	wake_lock_destroy(&unknown_wakeup);
+	wake_lock_destroy(&sync_wake_lock);
+	wake_lock_destroy(&main_wake_lock);
+#ifdef CONFIG_WAKELOCK_STAT
+	wake_lock_destroy(&deleted_wake_locks);
+#endif
+	return ret;
+}
+
+static void  __exit wakelocks_exit(void)
+{
+#ifdef CONFIG_WAKELOCK_STAT
+	remove_proc_entry("wakelocks", NULL);
+#endif
+	destroy_workqueue(suspend_work_queue);
+	destroy_workqueue(sync_work_queue);
+	platform_driver_unregister(&power_driver);
+	platform_device_unregister(&power_device);
+	wake_lock_destroy(&suspend_backoff_lock);
+	wake_lock_destroy(&unknown_wakeup);
+	wake_lock_destroy(&sync_wake_lock);
+	wake_lock_destroy(&main_wake_lock);
+#ifdef CONFIG_WAKELOCK_STAT
+	wake_lock_destroy(&deleted_wake_locks);
+#endif
+}
+
+core_initcall(wakelocks_init);
+module_exit(wakelocks_exit);