target/linux/goldfish/patches-2.6.30/0067-PM-Implement-early-suspend-api.patch

   1 From 2d4a25785ad1aa51bad967543e1ab20e9ed4a046 Mon Sep 17 00:00:00 2001
   2 From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
   3 Date: Tue, 7 Oct 2008 20:48:01 -0700
   4 Subject: [PATCH 067/134] PM: Implement early suspend api
   5
   6 ---
   7  kernel/power/Kconfig        |   12 +++
   8  kernel/power/Makefile       |    1 +
   9  kernel/power/earlysuspend.c |  178 +++++++++++++++++++++++++++++++++++++++++++
  10  kernel/power/power.h        |    6 ++
  11  4 files changed, 197 insertions(+), 0 deletions(-)
  12  create mode 100644 kernel/power/earlysuspend.c
  13
  14 --- a/kernel/power/Kconfig
  15 +++ b/kernel/power/Kconfig
  16 @@ -119,6 +119,9 @@ config SUSPEND_FREEZER
  17  config HAS_WAKELOCK
  18         bool
  19
  20 +config HAS_EARLYSUSPEND
  21 +       bool
  22 +
  23  config WAKELOCK
  24         bool "Wake lock"
  25         depends on PM && RTC_CLASS
  26 @@ -135,6 +138,15 @@ config WAKELOCK_STAT
  27         ---help---
  28           Report wake lock stats in /proc/wakelocks
  29
  30 +config EARLYSUSPEND
  31 +       bool "Early suspend"
  32 +       depends on WAKELOCK
  33 +       default y
  34 +       select HAS_EARLYSUSPEND
  35 +       ---help---
  36 +         Call early suspend handlers when the user requested sleep state
  37 +         changes.
  38 +
  39  config HIBERNATION
  40         bool "Hibernation (aka 'suspend to disk')"
  41         depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
  42 --- a/kernel/power/Makefile
  43 +++ b/kernel/power/Makefile
  44 @@ -7,6 +7,7 @@ obj-$(CONFIG_PM)                += main.o
  45  obj-$(CONFIG_PM_SLEEP)         += console.o
  46  obj-$(CONFIG_FREEZER)          += process.o
  47  obj-$(CONFIG_WAKELOCK)         += wakelock.o
  48 +obj-$(CONFIG_EARLYSUSPEND)     += earlysuspend.o
  49  obj-$(CONFIG_HIBERNATION)      += swsusp.o disk.o snapshot.o swap.o user.o
  50
  51  obj-$(CONFIG_MAGIC_SYSRQ)      += poweroff.o
  52 --- /dev/null
  53 +++ b/kernel/power/earlysuspend.c
  54 @@ -0,0 +1,178 @@
  55 +/* kernel/power/earlysuspend.c
  56 + *
  57 + * Copyright (C) 2005-2008 Google, Inc.
  58 + *
  59 + * This software is licensed under the terms of the GNU General Public
  60 + * License version 2, as published by the Free Software Foundation, and
  61 + * may be copied, distributed, and modified under those terms.
  62 + *
  63 + * This program is distributed in the hope that it will be useful,
  64 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  65 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  66 + * GNU General Public License for more details.
  67 + *
  68 + */
  69 +
  70 +#include <linux/earlysuspend.h>
  71 +#include <linux/module.h>
  72 +#include <linux/mutex.h>
  73 +#include <linux/rtc.h>
  74 +#include <linux/syscalls.h> /* sys_sync */
  75 +#include <linux/wakelock.h>
  76 +#include <linux/workqueue.h>
  77 +
  78 +#include "power.h"
  79 +
  80 +enum {
  81 +       DEBUG_USER_STATE = 1U << 0,
  82 +       DEBUG_SUSPEND = 1U << 2,
  83 +};
  84 +static int debug_mask = DEBUG_USER_STATE;
  85 +module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
  86 +
  87 +static DEFINE_MUTEX(early_suspend_lock);
  88 +static LIST_HEAD(early_suspend_handlers);
  89 +static void early_suspend(struct work_struct *work);
  90 +static void late_resume(struct work_struct *work);
  91 +static DECLARE_WORK(early_suspend_work, early_suspend);
  92 +static DECLARE_WORK(late_resume_work, late_resume);
  93 +static DEFINE_SPINLOCK(state_lock);
  94 +enum {
  95 +       SUSPEND_REQUESTED = 0x1,
  96 +       SUSPENDED = 0x2,
  97 +       SUSPEND_REQUESTED_AND_SUSPENDED = SUSPEND_REQUESTED | SUSPENDED,
  98 +};
  99 +static int state;
 100 +
 101 +void register_early_suspend(struct early_suspend *handler)
 102 +{
 103 +       struct list_head *pos;
 104 +
 105 +       mutex_lock(&early_suspend_lock);
 106 +       list_for_each(pos, &early_suspend_handlers) {
 107 +               struct early_suspend *e;
 108 +               e = list_entry(pos, struct early_suspend, link);
 109 +               if (e->level > handler->level)
 110 +                       break;
 111 +       }
 112 +       list_add_tail(&handler->link, pos);
 113 +       if ((state & SUSPENDED) && handler->suspend)
 114 +               handler->suspend(handler);
 115 +       mutex_unlock(&early_suspend_lock);
 116 +}
 117 +EXPORT_SYMBOL(register_early_suspend);
 118 +
 119 +void unregister_early_suspend(struct early_suspend *handler)
 120 +{
 121 +       mutex_lock(&early_suspend_lock);
 122 +       list_del(&handler->link);
 123 +       mutex_unlock(&early_suspend_lock);
 124 +}
 125 +EXPORT_SYMBOL(unregister_early_suspend);
 126 +
 127 +static void early_suspend(struct work_struct *work)
 128 +{
 129 +       struct early_suspend *pos;
 130 +       unsigned long irqflags;
 131 +       int abort = 0;
 132 +
 133 +       mutex_lock(&early_suspend_lock);
 134 +       spin_lock_irqsave(&state_lock, irqflags);
 135 +       if (state == SUSPEND_REQUESTED)
 136 +               state |= SUSPENDED;
 137 +       else
 138 +               abort = 1;
 139 +       spin_unlock_irqrestore(&state_lock, irqflags);
 140 +
 141 +       if (abort) {
 142 +               if (debug_mask & DEBUG_SUSPEND)
 143 +                       pr_info("early_suspend: abort, state %d\n", state);
 144 +               mutex_unlock(&early_suspend_lock);
 145 +               goto abort;
 146 +       }
 147 +
 148 +       if (debug_mask & DEBUG_SUSPEND)
 149 +               pr_info("early_suspend: call handlers\n");
 150 +       list_for_each_entry(pos, &early_suspend_handlers, link) {
 151 +               if (pos->suspend != NULL)
 152 +                       pos->suspend(pos);
 153 +       }
 154 +       mutex_unlock(&early_suspend_lock);
 155 +
 156 +       if (debug_mask & DEBUG_SUSPEND)
 157 +               pr_info("early_suspend: sync\n");
 158 +
 159 +       sys_sync();
 160 +abort:
 161 +       spin_lock_irqsave(&state_lock, irqflags);
 162 +       if (state == SUSPEND_REQUESTED_AND_SUSPENDED)
 163 +               wake_unlock(&main_wake_lock);
 164 +       spin_unlock_irqrestore(&state_lock, irqflags);
 165 +}
 166 +
 167 +static void late_resume(struct work_struct *work)
 168 +{
 169 +       struct early_suspend *pos;
 170 +       unsigned long irqflags;
 171 +       int abort = 0;
 172 +
 173 +       mutex_lock(&early_suspend_lock);
 174 +       spin_lock_irqsave(&state_lock, irqflags);
 175 +       if (state == SUSPENDED)
 176 +               state &= ~SUSPENDED;
 177 +       else
 178 +               abort = 1;
 179 +       spin_unlock_irqrestore(&state_lock, irqflags);
 180 +
 181 +       if (abort) {
 182 +               if (debug_mask & DEBUG_SUSPEND)
 183 +                       pr_info("late_resume: abort, state %d\n", state);
 184 +               goto abort;
 185 +       }
 186 +       if (debug_mask & DEBUG_SUSPEND)
 187 +               pr_info("late_resume: call handlers\n");
 188 +       list_for_each_entry_reverse(pos, &early_suspend_handlers, link)
 189 +               if (pos->resume != NULL)
 190 +                       pos->resume(pos);
 191 +       if (debug_mask & DEBUG_SUSPEND)
 192 +               pr_info("late_resume: done\n");
 193 +abort:
 194 +       mutex_unlock(&early_suspend_lock);
 195 +}
 196 +
 197 +void request_suspend_state(suspend_state_t new_state)
 198 +{
 199 +       unsigned long irqflags;
 200 +       int old_sleep;
 201 +
 202 +       spin_lock_irqsave(&state_lock, irqflags);
 203 +       old_sleep = state & SUSPEND_REQUESTED;
 204 +       if (debug_mask & DEBUG_USER_STATE) {
 205 +               struct timespec ts;
 206 +               struct rtc_time tm;
 207 +               getnstimeofday(&ts);
 208 +               rtc_time_to_tm(ts.tv_sec, &tm);
 209 +               pr_info("request_suspend_state: %s (%d->%d) at %lld "
 210 +                       "(%d-%02d-%02d %02d:%02d:%02d.%09lu UTC)\n",
 211 +                       new_state != PM_SUSPEND_ON ? "sleep" : "wakeup",
 212 +                       requested_suspend_state, new_state,
 213 +                       ktime_to_ns(ktime_get()),
 214 +                       tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
 215 +                       tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec);
 216 +       }
 217 +       if (!old_sleep && new_state != PM_SUSPEND_ON) {
 218 +               state |= SUSPEND_REQUESTED;
 219 +               queue_work(suspend_work_queue, &early_suspend_work);
 220 +       } else if (old_sleep && new_state == PM_SUSPEND_ON) {
 221 +               state &= ~SUSPEND_REQUESTED;
 222 +               wake_lock(&main_wake_lock);
 223 +               queue_work(suspend_work_queue, &late_resume_work);
 224 +       }
 225 +       requested_suspend_state = new_state;
 226 +       spin_unlock_irqrestore(&state_lock, irqflags);
 227 +}
 228 +
 229 +suspend_state_t get_suspend_state(void)
 230 +{
 231 +       return requested_suspend_state;
 232 +}
 233 --- a/kernel/power/power.h
 234 +++ b/kernel/power/power.h
 235 @@ -230,3 +230,9 @@ extern struct workqueue_struct *suspend_
 236  extern struct wake_lock main_wake_lock;
 237  extern suspend_state_t requested_suspend_state;
 238  #endif
 239 +
 240 +#ifdef CONFIG_EARLYSUSPEND
 241 +/* kernel/power/earlysuspend.c */
 242 +void request_suspend_state(suspend_state_t state);
 243 +suspend_state_t get_suspend_state(void);
 244 +#endif