--- /dev/null
+From 2d4a25785ad1aa51bad967543e1ab20e9ed4a046 Mon Sep 17 00:00:00 2001
+From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
+Date: Tue, 7 Oct 2008 20:48:01 -0700
+Subject: [PATCH 067/134] PM: Implement early suspend api
+
+---
+ kernel/power/Kconfig | 12 +++
+ kernel/power/Makefile | 1 +
+ kernel/power/earlysuspend.c | 178 +++++++++++++++++++++++++++++++++++++++++++
+ kernel/power/power.h | 6 ++
+ 4 files changed, 197 insertions(+), 0 deletions(-)
+ create mode 100644 kernel/power/earlysuspend.c
+
+--- a/kernel/power/Kconfig
++++ b/kernel/power/Kconfig
+@@ -119,6 +119,9 @@ config SUSPEND_FREEZER
+ config HAS_WAKELOCK
+ bool
+
++config HAS_EARLYSUSPEND
++ bool
++
+ config WAKELOCK
+ bool "Wake lock"
+ depends on PM && RTC_CLASS
+@@ -135,6 +138,15 @@ config WAKELOCK_STAT
+ ---help---
+ Report wake lock stats in /proc/wakelocks
+
++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.
++
+ config HIBERNATION
+ bool "Hibernation (aka 'suspend to disk')"
+ depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
+--- a/kernel/power/Makefile
++++ b/kernel/power/Makefile
+@@ -7,6 +7,7 @@ obj-$(CONFIG_PM) += main.o
+ obj-$(CONFIG_PM_SLEEP) += console.o
+ obj-$(CONFIG_FREEZER) += process.o
+ obj-$(CONFIG_WAKELOCK) += wakelock.o
++obj-$(CONFIG_EARLYSUSPEND) += earlysuspend.o
+ obj-$(CONFIG_HIBERNATION) += swsusp.o disk.o snapshot.o swap.o user.o
+
+ obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
+--- /dev/null
++++ b/kernel/power/earlysuspend.c
+@@ -0,0 +1,178 @@
++/* 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,
++};
++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 early_suspend(struct work_struct *work);
++static void late_resume(struct work_struct *work);
++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;
++
++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;
++
++ 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)
++ pos->suspend(pos);
++ }
++ mutex_unlock(&early_suspend_lock);
++
++ if (debug_mask & DEBUG_SUSPEND)
++ pr_info("early_suspend: sync\n");
++
++ sys_sync();
++abort:
++ spin_lock_irqsave(&state_lock, irqflags);
++ if (state == SUSPEND_REQUESTED_AND_SUSPENDED)
++ wake_unlock(&main_wake_lock);
++ spin_unlock_irqrestore(&state_lock, irqflags);
++}
++
++static void late_resume(struct work_struct *work)
++{
++ struct early_suspend *pos;
++ unsigned long irqflags;
++ int abort = 0;
++
++ 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)
++ pos->resume(pos);
++ if (debug_mask & DEBUG_SUSPEND)
++ pr_info("late_resume: done\n");
++abort:
++ mutex_unlock(&early_suspend_lock);
++}
++
++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;
++}
+--- a/kernel/power/power.h
++++ b/kernel/power/power.h
+@@ -230,3 +230,9 @@ extern struct workqueue_struct *suspend_
+ extern struct wake_lock main_wake_lock;
+ extern suspend_state_t requested_suspend_state;
+ #endif
++
++#ifdef CONFIG_EARLYSUSPEND
++/* kernel/power/earlysuspend.c */
++void request_suspend_state(suspend_state_t state);
++suspend_state_t get_suspend_state(void);
++#endif
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