target/linux/goldfish/patches-2.6.30/0066-PM-Implement-wakelock-api.patch

   1 From eef7f012d480142a3eccff91e0ae73ecb13220b3 Mon Sep 17 00:00:00 2001
   2 From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
   3 Date: Tue, 9 Sep 2008 22:14:34 -0700
   4 Subject: [PATCH 066/134] PM: Implement wakelock api.
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=utf-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 PM: wakelock: Replace expire work with a timer
  10
  11 The expire work function did not work in the normal case.
  12
  13 Signed-off-by: Arve Hjønnevåg <arve@android.com>
  14 ---
  15  kernel/power/Kconfig    |   19 ++
  16  kernel/power/Makefile   |    1 +
  17  kernel/power/power.h    |    7 +
  18  kernel/power/wakelock.c |  598 +++++++++++++++++++++++++++++++++++++++++++++++
  19  4 files changed, 625 insertions(+), 0 deletions(-)
  20  create mode 100644 kernel/power/wakelock.c
  21
  22 --- a/kernel/power/Kconfig
  23 +++ b/kernel/power/Kconfig
  24 @@ -116,6 +116,25 @@ config SUSPEND_FREEZER
  25
  26           Turning OFF this setting is NOT recommended! If in doubt, say Y.
  27
  28 +config HAS_WAKELOCK
  29 +       bool
  30 +
  31 +config WAKELOCK
  32 +       bool "Wake lock"
  33 +       depends on PM && RTC_CLASS
  34 +       default n
  35 +       select HAS_WAKELOCK
  36 +       ---help---
  37 +         Enable wakelocks. When user space request a sleep state the
  38 +         sleep request will be delayed until no wake locks are held.
  39 +
  40 +config WAKELOCK_STAT
  41 +       bool "Wake lock stats"
  42 +       depends on WAKELOCK
  43 +       default y
  44 +       ---help---
  45 +         Report wake lock stats in /proc/wakelocks
  46 +
  47  config HIBERNATION
  48         bool "Hibernation (aka 'suspend to disk')"
  49         depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
  50 --- a/kernel/power/Makefile
  51 +++ b/kernel/power/Makefile
  52 @@ -6,6 +6,7 @@ endif
  53  obj-$(CONFIG_PM)               += main.o
  54  obj-$(CONFIG_PM_SLEEP)         += console.o
  55  obj-$(CONFIG_FREEZER)          += process.o
  56 +obj-$(CONFIG_WAKELOCK)         += wakelock.o
  57  obj-$(CONFIG_HIBERNATION)      += swsusp.o disk.o snapshot.o swap.o user.o
  58
  59  obj-$(CONFIG_MAGIC_SYSRQ)      += poweroff.o
  60 --- a/kernel/power/power.h
  61 +++ b/kernel/power/power.h
  62 @@ -223,3 +223,10 @@ static inline void suspend_thaw_processe
  63  {
  64  }
  65  #endif
  66 +
  67 +#ifdef CONFIG_WAKELOCK
  68 +/* kernel/power/wakelock.c */
  69 +extern struct workqueue_struct *suspend_work_queue;
  70 +extern struct wake_lock main_wake_lock;
  71 +extern suspend_state_t requested_suspend_state;
  72 +#endif
  73 --- /dev/null
  74 +++ b/kernel/power/wakelock.c
  75 @@ -0,0 +1,598 @@
  76 +/* kernel/power/wakelock.c
  77 + *
  78 + * Copyright (C) 2005-2008 Google, Inc.
  79 + *
  80 + * This software is licensed under the terms of the GNU General Public
  81 + * License version 2, as published by the Free Software Foundation, and
  82 + * may be copied, distributed, and modified under those terms.
  83 + *
  84 + * This program is distributed in the hope that it will be useful,
  85 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  86 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  87 + * GNU General Public License for more details.
  88 + *
  89 + */
  90 +
  91 +#include <linux/module.h>
  92 +#include <linux/platform_device.h>
  93 +#include <linux/rtc.h>
  94 +#include <linux/suspend.h>
  95 +#include <linux/syscalls.h> /* sys_sync */
  96 +#include <linux/wakelock.h>
  97 +#ifdef CONFIG_WAKELOCK_STAT
  98 +#include <linux/proc_fs.h>
  99 +#endif
 100 +#include "power.h"
 101 +
 102 +enum {
 103 +       DEBUG_EXIT_SUSPEND = 1U << 0,
 104 +       DEBUG_WAKEUP = 1U << 1,
 105 +       DEBUG_SUSPEND = 1U << 2,
 106 +       DEBUG_EXPIRE = 1U << 3,
 107 +       DEBUG_WAKE_LOCK = 1U << 4,
 108 +};
 109 +static int debug_mask = DEBUG_EXIT_SUSPEND | DEBUG_WAKEUP;
 110 +module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
 111 +
 112 +#define WAKE_LOCK_TYPE_MASK              (0x0f)
 113 +#define WAKE_LOCK_INITIALIZED            (1U << 8)
 114 +#define WAKE_LOCK_ACTIVE                 (1U << 9)
 115 +#define WAKE_LOCK_AUTO_EXPIRE            (1U << 10)
 116 +#define WAKE_LOCK_PREVENTING_SUSPEND     (1U << 11)
 117 +
 118 +static DEFINE_SPINLOCK(list_lock);
 119 +static LIST_HEAD(inactive_locks);
 120 +static struct list_head active_wake_locks[WAKE_LOCK_TYPE_COUNT];
 121 +static int current_event_num;
 122 +struct workqueue_struct *suspend_work_queue;
 123 +struct wake_lock main_wake_lock;
 124 +suspend_state_t requested_suspend_state = PM_SUSPEND_MEM;
 125 +static struct wake_lock unknown_wakeup;
 126 +
 127 +#ifdef CONFIG_WAKELOCK_STAT
 128 +static struct wake_lock deleted_wake_locks;
 129 +static ktime_t last_sleep_time_update;
 130 +static int wait_for_wakeup;
 131 +
 132 +int get_expired_time(struct wake_lock *lock, ktime_t *expire_time)
 133 +{
 134 +       struct timespec ts;
 135 +       struct timespec kt;
 136 +       struct timespec tomono;
 137 +       struct timespec delta;
 138 +       unsigned long seq;
 139 +       long timeout;
 140 +
 141 +       if (!(lock->flags & WAKE_LOCK_AUTO_EXPIRE))
 142 +               return 0;
 143 +       do {
 144 +               seq = read_seqbegin(&xtime_lock);
 145 +               timeout = lock->expires - jiffies;
 146 +               if (timeout > 0)
 147 +                       return 0;
 148 +               kt = current_kernel_time();
 149 +               tomono = wall_to_monotonic;
 150 +       } while (read_seqretry(&xtime_lock, seq));
 151 +       jiffies_to_timespec(-timeout, &delta);
 152 +       set_normalized_timespec(&ts, kt.tv_sec + tomono.tv_sec - delta.tv_sec,
 153 +                               kt.tv_nsec + tomono.tv_nsec - delta.tv_nsec);
 154 +       *expire_time = timespec_to_ktime(ts);
 155 +       return 1;
 156 +}
 157 +
 158 +
 159 +static int print_lock_stat(char *buf, struct wake_lock *lock)
 160 +{
 161 +       int lock_count = lock->stat.count;
 162 +       int expire_count = lock->stat.expire_count;
 163 +       ktime_t active_time = ktime_set(0, 0);
 164 +       ktime_t total_time = lock->stat.total_time;
 165 +       ktime_t max_time = lock->stat.max_time;
 166 +       ktime_t prevent_suspend_time = lock->stat.prevent_suspend_time;
 167 +       if (lock->flags & WAKE_LOCK_ACTIVE) {
 168 +               ktime_t now, add_time;
 169 +               int expired = get_expired_time(lock, &now);
 170 +               if (!expired)
 171 +                       now = ktime_get();
 172 +               add_time = ktime_sub(now, lock->stat.last_time);
 173 +               lock_count++;
 174 +               if (!expired)
 175 +                       active_time = add_time;
 176 +               else
 177 +                       expire_count++;
 178 +               total_time = ktime_add(total_time, add_time);
 179 +               if (lock->flags & WAKE_LOCK_PREVENTING_SUSPEND)
 180 +                       prevent_suspend_time = ktime_add(prevent_suspend_time,
 181 +                                       ktime_sub(now, last_sleep_time_update));
 182 +               if (add_time.tv64 > max_time.tv64)
 183 +                       max_time = add_time;
 184 +       }
 185 +
 186 +       return sprintf(buf, "\"%s\"\t%d\t%d\t%d\t%lld\t%lld\t%lld\t%lld\t"
 187 +                      "%lld\n", lock->name, lock_count, expire_count,
 188 +                      lock->stat.wakeup_count, ktime_to_ns(active_time),
 189 +                      ktime_to_ns(total_time),
 190 +                      ktime_to_ns(prevent_suspend_time), ktime_to_ns(max_time),
 191 +                      ktime_to_ns(lock->stat.last_time));
 192 +}
 193 +
 194 +
 195 +static int wakelocks_read_proc(char *page, char **start, off_t off,
 196 +                              int count, int *eof, void *data)
 197 +{
 198 +       unsigned long irqflags;
 199 +       struct wake_lock *lock;
 200 +       int len = 0;
 201 +       char *p = page;
 202 +       int type;
 203 +
 204 +       spin_lock_irqsave(&list_lock, irqflags);
 205 +
 206 +       p += sprintf(p, "name\tcount\texpire_count\twake_count\tactive_since"
 207 +                    "\ttotal_time\tsleep_time\tmax_time\tlast_change\n");
 208 +       list_for_each_entry(lock, &inactive_locks, link) {
 209 +               p += print_lock_stat(p, lock);
 210 +       }
 211 +       for (type = 0; type < WAKE_LOCK_TYPE_COUNT; type++) {
 212 +               list_for_each_entry(lock, &active_wake_locks[type], link)
 213 +                       p += print_lock_stat(p, lock);
 214 +       }
 215 +       spin_unlock_irqrestore(&list_lock, irqflags);
 216 +
 217 +       *start = page + off;
 218 +
 219 +       len = p - page;
 220 +       if (len > off)
 221 +               len -= off;
 222 +       else
 223 +               len = 0;
 224 +
 225 +       return len < count ? len  : count;
 226 +}
 227 +
 228 +static void wake_unlock_stat_locked(struct wake_lock *lock, int expired)
 229 +{
 230 +       ktime_t duration;
 231 +       ktime_t now;
 232 +       if (!(lock->flags & WAKE_LOCK_ACTIVE))
 233 +               return;
 234 +       if (get_expired_time(lock, &now))
 235 +               expired = 1;
 236 +       else
 237 +               now = ktime_get();
 238 +       lock->stat.count++;
 239 +       if (expired)
 240 +               lock->stat.expire_count++;
 241 +       duration = ktime_sub(now, lock->stat.last_time);
 242 +       lock->stat.total_time = ktime_add(lock->stat.total_time, duration);
 243 +       if (ktime_to_ns(duration) > ktime_to_ns(lock->stat.max_time))
 244 +               lock->stat.max_time = duration;
 245 +       lock->stat.last_time = ktime_get();
 246 +       if (lock->flags & WAKE_LOCK_PREVENTING_SUSPEND) {
 247 +               duration = ktime_sub(now, last_sleep_time_update);
 248 +               lock->stat.prevent_suspend_time = ktime_add(
 249 +                       lock->stat.prevent_suspend_time, duration);
 250 +               lock->flags &= ~WAKE_LOCK_PREVENTING_SUSPEND;
 251 +       }
 252 +}
 253 +
 254 +static void update_sleep_wait_stats_locked(int done)
 255 +{
 256 +       struct wake_lock *lock;
 257 +       ktime_t now, etime, elapsed, add;
 258 +       int expired;
 259 +
 260 +       now = ktime_get();
 261 +       elapsed = ktime_sub(now, last_sleep_time_update);
 262 +       list_for_each_entry(lock, &active_wake_locks[WAKE_LOCK_SUSPEND], link) {
 263 +               expired = get_expired_time(lock, &etime);
 264 +               if (lock->flags & WAKE_LOCK_PREVENTING_SUSPEND) {
 265 +                       if (expired)
 266 +                               add = ktime_sub(etime, last_sleep_time_update);
 267 +                       else
 268 +                               add = elapsed;
 269 +                       lock->stat.prevent_suspend_time = ktime_add(
 270 +                               lock->stat.prevent_suspend_time, add);
 271 +               }
 272 +               if (done || expired)
 273 +                       lock->flags &= ~WAKE_LOCK_PREVENTING_SUSPEND;
 274 +               else
 275 +                       lock->flags |= WAKE_LOCK_PREVENTING_SUSPEND;
 276 +       }
 277 +       last_sleep_time_update = now;
 278 +}
 279 +#endif
 280 +
 281 +
 282 +static void expire_wake_lock(struct wake_lock *lock)
 283 +{
 284 +#ifdef CONFIG_WAKELOCK_STAT
 285 +       wake_unlock_stat_locked(lock, 1);
 286 +#endif
 287 +       lock->flags &= ~(WAKE_LOCK_ACTIVE | WAKE_LOCK_AUTO_EXPIRE);
 288 +       list_del(&lock->link);
 289 +       list_add(&lock->link, &inactive_locks);
 290 +       if (debug_mask & (DEBUG_WAKE_LOCK | DEBUG_EXPIRE))
 291 +               pr_info("expired wake lock %s\n", lock->name);
 292 +}
 293 +
 294 +static void print_active_locks(int type)
 295 +{
 296 +       unsigned long irqflags;
 297 +       struct wake_lock *lock;
 298 +
 299 +       BUG_ON(type >= WAKE_LOCK_TYPE_COUNT);
 300 +       spin_lock_irqsave(&list_lock, irqflags);
 301 +       list_for_each_entry(lock, &active_wake_locks[type], link) {
 302 +               if (lock->flags & WAKE_LOCK_AUTO_EXPIRE) {
 303 +                       long timeout = lock->expires - jiffies;
 304 +                       if (timeout <= 0)
 305 +                               pr_info("wake lock %s, expired\n", lock->name);
 306 +                       else
 307 +                               pr_info("active wake lock %s, time left %ld\n",
 308 +                                       lock->name, timeout);
 309 +               } else
 310 +                       pr_info("active wake lock %s\n", lock->name);
 311 +       }
 312 +       spin_unlock_irqrestore(&list_lock, irqflags);
 313 +}
 314 +
 315 +static long has_wake_lock_locked(int type)
 316 +{
 317 +       struct wake_lock *lock, *n;
 318 +       long max_timeout = 0;
 319 +
 320 +       BUG_ON(type >= WAKE_LOCK_TYPE_COUNT);
 321 +       list_for_each_entry_safe(lock, n, &active_wake_locks[type], link) {
 322 +               if (lock->flags & WAKE_LOCK_AUTO_EXPIRE) {
 323 +                       long timeout = lock->expires - jiffies;
 324 +                       if (timeout <= 0)
 325 +                               expire_wake_lock(lock);
 326 +                       else if (timeout > max_timeout)
 327 +                               max_timeout = timeout;
 328 +               } else
 329 +                       return -1;
 330 +       }
 331 +       return max_timeout;
 332 +}
 333 +
 334 +long has_wake_lock(int type)
 335 +{
 336 +       long ret;
 337 +       unsigned long irqflags;
 338 +       spin_lock_irqsave(&list_lock, irqflags);
 339 +       ret = has_wake_lock_locked(type);
 340 +       spin_unlock_irqrestore(&list_lock, irqflags);
 341 +       return ret;
 342 +}
 343 +
 344 +static void suspend(struct work_struct *work)
 345 +{
 346 +       int ret;
 347 +       int entry_event_num;
 348 +
 349 +       if (has_wake_lock(WAKE_LOCK_SUSPEND)) {
 350 +               if (debug_mask & DEBUG_SUSPEND)
 351 +                       pr_info("suspend: abort suspend\n");
 352 +               return;
 353 +       }
 354 +
 355 +       entry_event_num = current_event_num;
 356 +       sys_sync();
 357 +       if (debug_mask & DEBUG_SUSPEND)
 358 +               pr_info("suspend: enter suspend\n");
 359 +       ret = pm_suspend(requested_suspend_state);
 360 +       if (debug_mask & DEBUG_EXIT_SUSPEND) {
 361 +               struct timespec ts;
 362 +               struct rtc_time tm;
 363 +               getnstimeofday(&ts);
 364 +               rtc_time_to_tm(ts.tv_sec, &tm);
 365 +               pr_info("suspend: exit suspend, ret = %d "
 366 +                       "(%d-%02d-%02d %02d:%02d:%02d.%09lu UTC)\n", ret,
 367 +                       tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
 368 +                       tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec);
 369 +       }
 370 +       if (current_event_num == entry_event_num) {
 371 +               if (debug_mask & DEBUG_SUSPEND)
 372 +                       pr_info("suspend: pm_suspend returned with no event\n");
 373 +               wake_lock_timeout(&unknown_wakeup, HZ / 2);
 374 +       }
 375 +}
 376 +static DECLARE_WORK(suspend_work, suspend);
 377 +
 378 +static void expire_wake_locks(unsigned long data)
 379 +{
 380 +       long has_lock;
 381 +       unsigned long irqflags;
 382 +       if (debug_mask & DEBUG_EXPIRE)
 383 +               pr_info("expire_wake_locks: start\n");
 384 +       if (debug_mask & DEBUG_SUSPEND)
 385 +               print_active_locks(WAKE_LOCK_SUSPEND);
 386 +       spin_lock_irqsave(&list_lock, irqflags);
 387 +       has_lock = has_wake_lock_locked(WAKE_LOCK_SUSPEND);
 388 +       if (debug_mask & DEBUG_EXPIRE)
 389 +               pr_info("expire_wake_locks: done, has_lock %ld\n", has_lock);
 390 +       if (has_lock == 0)
 391 +               queue_work(suspend_work_queue, &suspend_work);
 392 +       spin_unlock_irqrestore(&list_lock, irqflags);
 393 +}
 394 +static DEFINE_TIMER(expire_timer, expire_wake_locks, 0, 0);
 395 +
 396 +static int power_suspend_late(struct platform_device *pdev, pm_message_t state)
 397 +{
 398 +       int ret = has_wake_lock(WAKE_LOCK_SUSPEND) ? -EAGAIN : 0;
 399 +#ifdef CONFIG_WAKELOCK_STAT
 400 +       wait_for_wakeup = 1;
 401 +#endif
 402 +       if (debug_mask & DEBUG_SUSPEND)
 403 +               pr_info("power_suspend_late return %d\n", ret);
 404 +       return ret;
 405 +}
 406 +
 407 +static struct platform_driver power_driver = {
 408 +       .driver.name = "power",
 409 +       .suspend_late = power_suspend_late,
 410 +};
 411 +static struct platform_device power_device = {
 412 +       .name = "power",
 413 +};
 414 +
 415 +void wake_lock_init(struct wake_lock *lock, int type, const char *name)
 416 +{
 417 +       unsigned long irqflags = 0;
 418 +
 419 +       if (name)
 420 +               lock->name = name;
 421 +       BUG_ON(!lock->name);
 422 +
 423 +       if (debug_mask & DEBUG_WAKE_LOCK)
 424 +               pr_info("wake_lock_init name=%s\n", lock->name);
 425 +#ifdef CONFIG_WAKELOCK_STAT
 426 +       lock->stat.count = 0;
 427 +       lock->stat.expire_count = 0;
 428 +       lock->stat.wakeup_count = 0;
 429 +       lock->stat.total_time = ktime_set(0, 0);
 430 +       lock->stat.prevent_suspend_time = ktime_set(0, 0);
 431 +       lock->stat.max_time = ktime_set(0, 0);
 432 +       lock->stat.last_time = ktime_set(0, 0);
 433 +#endif
 434 +       lock->flags = (type & WAKE_LOCK_TYPE_MASK) | WAKE_LOCK_INITIALIZED;
 435 +
 436 +       INIT_LIST_HEAD(&lock->link);
 437 +       spin_lock_irqsave(&list_lock, irqflags);
 438 +       list_add(&lock->link, &inactive_locks);
 439 +       spin_unlock_irqrestore(&list_lock, irqflags);
 440 +}
 441 +EXPORT_SYMBOL(wake_lock_init);
 442 +
 443 +void wake_lock_destroy(struct wake_lock *lock)
 444 +{
 445 +       unsigned long irqflags;
 446 +       if (debug_mask & DEBUG_WAKE_LOCK)
 447 +               pr_info("wake_lock_destroy name=%s\n", lock->name);
 448 +       spin_lock_irqsave(&list_lock, irqflags);
 449 +       lock->flags &= ~WAKE_LOCK_INITIALIZED;
 450 +#ifdef CONFIG_WAKELOCK_STAT
 451 +       if (lock->stat.count) {
 452 +               deleted_wake_locks.stat.count += lock->stat.count;
 453 +               deleted_wake_locks.stat.expire_count += lock->stat.expire_count;
 454 +               deleted_wake_locks.stat.total_time =
 455 +                       ktime_add(deleted_wake_locks.stat.total_time,
 456 +                                 lock->stat.total_time);
 457 +               deleted_wake_locks.stat.prevent_suspend_time =
 458 +                       ktime_add(deleted_wake_locks.stat.prevent_suspend_time,
 459 +                                 lock->stat.prevent_suspend_time);
 460 +               deleted_wake_locks.stat.max_time =
 461 +                       ktime_add(deleted_wake_locks.stat.max_time,
 462 +                                 lock->stat.max_time);
 463 +       }
 464 +#endif
 465 +       list_del(&lock->link);
 466 +       spin_unlock_irqrestore(&list_lock, irqflags);
 467 +}
 468 +EXPORT_SYMBOL(wake_lock_destroy);
 469 +
 470 +static void wake_lock_internal(
 471 +       struct wake_lock *lock, long timeout, int has_timeout)
 472 +{
 473 +       int type;
 474 +       unsigned long irqflags;
 475 +       long expire_in;
 476 +
 477 +       spin_lock_irqsave(&list_lock, irqflags);
 478 +       type = lock->flags & WAKE_LOCK_TYPE_MASK;
 479 +       BUG_ON(type >= WAKE_LOCK_TYPE_COUNT);
 480 +       BUG_ON(!(lock->flags & WAKE_LOCK_INITIALIZED));
 481 +#ifdef CONFIG_WAKELOCK_STAT
 482 +       if (type == WAKE_LOCK_SUSPEND && wait_for_wakeup) {
 483 +               if (debug_mask & DEBUG_WAKEUP)
 484 +                       pr_info("wakeup wake lock: %s\n", lock->name);
 485 +               wait_for_wakeup = 0;
 486 +               lock->stat.wakeup_count++;
 487 +       }
 488 +       if ((lock->flags & WAKE_LOCK_AUTO_EXPIRE) &&
 489 +           (long)(lock->expires - jiffies) <= 0) {
 490 +               wake_unlock_stat_locked(lock, 0);
 491 +               lock->stat.last_time = ktime_get();
 492 +       }
 493 +#endif
 494 +       if (!(lock->flags & WAKE_LOCK_ACTIVE)) {
 495 +               lock->flags |= WAKE_LOCK_ACTIVE;
 496 +#ifdef CONFIG_WAKELOCK_STAT
 497 +               lock->stat.last_time = ktime_get();
 498 +#endif
 499 +       }
 500 +       list_del(&lock->link);
 501 +       if (has_timeout) {
 502 +               if (debug_mask & DEBUG_WAKE_LOCK)
 503 +                       pr_info("wake_lock: %s, type %d, timeout %ld.%03lu\n",
 504 +                               lock->name, type, timeout / HZ,
 505 +                               (timeout % HZ) * MSEC_PER_SEC / HZ);
 506 +               lock->expires = jiffies + timeout;
 507 +               lock->flags |= WAKE_LOCK_AUTO_EXPIRE;
 508 +               list_add_tail(&lock->link, &active_wake_locks[type]);
 509 +       } else {
 510 +               if (debug_mask & DEBUG_WAKE_LOCK)
 511 +                       pr_info("wake_lock: %s, type %d\n", lock->name, type);
 512 +               lock->expires = LONG_MAX;
 513 +               lock->flags &= ~WAKE_LOCK_AUTO_EXPIRE;
 514 +               list_add(&lock->link, &active_wake_locks[type]);
 515 +       }
 516 +       if (type == WAKE_LOCK_SUSPEND) {
 517 +               current_event_num++;
 518 +#ifdef CONFIG_WAKELOCK_STAT
 519 +               if (lock == &main_wake_lock)
 520 +                       update_sleep_wait_stats_locked(1);
 521 +               else if (!wake_lock_active(&main_wake_lock))
 522 +                       update_sleep_wait_stats_locked(0);
 523 +#endif
 524 +               if (has_timeout)
 525 +                       expire_in = has_wake_lock_locked(type);
 526 +               else
 527 +                       expire_in = -1;
 528 +               if (expire_in > 0) {
 529 +                       if (debug_mask & DEBUG_EXPIRE)
 530 +                               pr_info("wake_lock: %s, start expire timer, "
 531 +                                       "%ld\n", lock->name, expire_in);
 532 +                       mod_timer(&expire_timer, jiffies + expire_in);
 533 +               } else {
 534 +                       if (del_timer(&expire_timer))
 535 +                               if (debug_mask & DEBUG_EXPIRE)
 536 +                                       pr_info("wake_lock: %s, stop expire timer\n",
 537 +                                               lock->name);
 538 +                       if (expire_in == 0)
 539 +                               queue_work(suspend_work_queue, &suspend_work);
 540 +               }
 541 +       }
 542 +       spin_unlock_irqrestore(&list_lock, irqflags);
 543 +}
 544 +
 545 +void wake_lock(struct wake_lock *lock)
 546 +{
 547 +       wake_lock_internal(lock, 0, 0);
 548 +}
 549 +EXPORT_SYMBOL(wake_lock);
 550 +
 551 +void wake_lock_timeout(struct wake_lock *lock, long timeout)
 552 +{
 553 +       wake_lock_internal(lock, timeout, 1);
 554 +}
 555 +EXPORT_SYMBOL(wake_lock_timeout);
 556 +
 557 +void wake_unlock(struct wake_lock *lock)
 558 +{
 559 +       int type;
 560 +       unsigned long irqflags;
 561 +       spin_lock_irqsave(&list_lock, irqflags);
 562 +       type = lock->flags & WAKE_LOCK_TYPE_MASK;
 563 +#ifdef CONFIG_WAKELOCK_STAT
 564 +       wake_unlock_stat_locked(lock, 0);
 565 +#endif
 566 +       if (debug_mask & DEBUG_WAKE_LOCK)
 567 +               pr_info("wake_unlock: %s\n", lock->name);
 568 +       lock->flags &= ~(WAKE_LOCK_ACTIVE | WAKE_LOCK_AUTO_EXPIRE);
 569 +       list_del(&lock->link);
 570 +       list_add(&lock->link, &inactive_locks);
 571 +       if (type == WAKE_LOCK_SUSPEND) {
 572 +               long has_lock = has_wake_lock_locked(type);
 573 +               if (has_lock > 0) {
 574 +                       if (debug_mask & DEBUG_EXPIRE)
 575 +                               pr_info("wake_unlock: %s, start expire timer, "
 576 +                                       "%ld\n", lock->name, has_lock);
 577 +                       mod_timer(&expire_timer, jiffies + has_lock);
 578 +               } else {
 579 +                       if (del_timer(&expire_timer))
 580 +                               if (debug_mask & DEBUG_EXPIRE)
 581 +                                       pr_info("wake_unlock: %s, stop expire "
 582 +                                               "timer\n", lock->name);
 583 +                       if (has_lock == 0)
 584 +                               queue_work(suspend_work_queue, &suspend_work);
 585 +               }
 586 +               if (lock == &main_wake_lock) {
 587 +                       if (debug_mask & DEBUG_SUSPEND)
 588 +                               print_active_locks(WAKE_LOCK_SUSPEND);
 589 +#ifdef CONFIG_WAKELOCK_STAT
 590 +                       update_sleep_wait_stats_locked(0);
 591 +#endif
 592 +               }
 593 +       }
 594 +       spin_unlock_irqrestore(&list_lock, irqflags);
 595 +}
 596 +EXPORT_SYMBOL(wake_unlock);
 597 +
 598 +int wake_lock_active(struct wake_lock *lock)
 599 +{
 600 +       return !!(lock->flags & WAKE_LOCK_ACTIVE);
 601 +}
 602 +EXPORT_SYMBOL(wake_lock_active);
 603 +
 604 +static int __init wakelocks_init(void)
 605 +{
 606 +       int ret;
 607 +       int i;
 608 +
 609 +       for (i = 0; i < ARRAY_SIZE(active_wake_locks); i++)
 610 +               INIT_LIST_HEAD(&active_wake_locks[i]);
 611 +
 612 +#ifdef CONFIG_WAKELOCK_STAT
 613 +       wake_lock_init(&deleted_wake_locks, WAKE_LOCK_SUSPEND,
 614 +                       "deleted_wake_locks");
 615 +#endif
 616 +       wake_lock_init(&main_wake_lock, WAKE_LOCK_SUSPEND, "main");
 617 +       wake_lock(&main_wake_lock);
 618 +       wake_lock_init(&unknown_wakeup, WAKE_LOCK_SUSPEND, "unknown_wakeups");
 619 +
 620 +       ret = platform_device_register(&power_device);
 621 +       if (ret) {
 622 +               pr_err("wakelocks_init: platform_device_register failed\n");
 623 +               goto err_platform_device_register;
 624 +       }
 625 +       ret = platform_driver_register(&power_driver);
 626 +       if (ret) {
 627 +               pr_err("wakelocks_init: platform_driver_register failed\n");
 628 +               goto err_platform_driver_register;
 629 +       }
 630 +
 631 +       suspend_work_queue = create_singlethread_workqueue("suspend");
 632 +       if (suspend_work_queue == NULL) {
 633 +               ret = -ENOMEM;
 634 +               goto err_suspend_work_queue;
 635 +       }
 636 +
 637 +#ifdef CONFIG_WAKELOCK_STAT
 638 +       create_proc_read_entry("wakelocks", S_IRUGO, NULL,
 639 +                               wakelocks_read_proc, NULL);
 640 +#endif
 641 +
 642 +       return 0;
 643 +
 644 +err_suspend_work_queue:
 645 +       platform_driver_unregister(&power_driver);
 646 +err_platform_driver_register:
 647 +       platform_device_unregister(&power_device);
 648 +err_platform_device_register:
 649 +       wake_lock_destroy(&unknown_wakeup);
 650 +       wake_lock_destroy(&main_wake_lock);
 651 +#ifdef CONFIG_WAKELOCK_STAT
 652 +       wake_lock_destroy(&deleted_wake_locks);
 653 +#endif
 654 +       return ret;
 655 +}
 656 +
 657 +static void  __exit wakelocks_exit(void)
 658 +{
 659 +#ifdef CONFIG_WAKELOCK_STAT
 660 +       remove_proc_entry("wakelocks", NULL);
 661 +#endif
 662 +       destroy_workqueue(suspend_work_queue);
 663 +       platform_driver_unregister(&power_driver);
 664 +       platform_device_unregister(&power_device);
 665 +       wake_lock_destroy(&unknown_wakeup);
 666 +       wake_lock_destroy(&main_wake_lock);
 667 +#ifdef CONFIG_WAKELOCK_STAT
 668 +       wake_lock_destroy(&deleted_wake_locks);
 669 +#endif
 670 +}
 671 +
 672 +core_initcall(wakelocks_init);
 673 +module_exit(wakelocks_exit);