kernel/power/main.c

   1 /*
   2  * kernel/power/main.c - PM subsystem core functionality.
   3  *
   4  * Copyright (c) 2003 Patrick Mochel
   5  * Copyright (c) 2003 Open Source Development Lab
   6  *
   7  * This file is released under the GPLv2
   8  *
   9  */
  10
  11 #include <linux/export.h>
  12 #include <linux/kobject.h>
  13 #include <linux/string.h>
  14 #include <linux/resume-trace.h>
  15 #include <linux/workqueue.h>
  16 #include <linux/debugfs.h>
  17 #include <linux/seq_file.h>
  18
  19 #include "power.h"
  20
  21 #define HIB_PM_DEBUG 1
  22 #define _TAG_HIB_M "HIB/PM"
  23 #if (HIB_PM_DEBUG)
  24 #undef hib_log
  25 #define hib_log(fmt, ...)  pr_warn("[%s][%s]" fmt, _TAG_HIB_M, __func__, ##__VA_ARGS__);
  26 #else
  27 #define hib_log(fmt, ...)
  28 #endif
  29 #undef hib_warn
  30 #define hib_warn(fmt, ...) pr_warn("[%s][%s]" fmt, _TAG_HIB_M, __func__, ##__VA_ARGS__);
  31
  32 DEFINE_MUTEX(pm_mutex);
  33 EXPORT_SYMBOL_GPL(pm_mutex);
  34
  35 #ifdef CONFIG_PM_SLEEP
  36
  37 /* Routines for PM-transition notifications */
  38
  39 BLOCKING_NOTIFIER_HEAD(pm_chain_head);
  40 EXPORT_SYMBOL_GPL(pm_chain_head);
  41 //<20130327> <marc.huang> add pm_notifier_count
  42 static unsigned int pm_notifier_count = 0;
  43
  44 int register_pm_notifier(struct notifier_block *nb)
  45 {
  46         //<20130327> <marc.huang> add pm_notifier_count
  47         ++pm_notifier_count;
  48         return blocking_notifier_chain_register(&pm_chain_head, nb);
  49 }
  50 EXPORT_SYMBOL_GPL(register_pm_notifier);
  51
  52 int unregister_pm_notifier(struct notifier_block *nb)
  53 {
  54         //<20130327> <marc.huang> add pm_notifier_count
  55         --pm_notifier_count;
  56         return blocking_notifier_chain_unregister(&pm_chain_head, nb);
  57 }
  58 EXPORT_SYMBOL_GPL(unregister_pm_notifier);
  59
  60 int pm_notifier_call_chain(unsigned long val)
  61 {
  62         //<20130327> <marc.huang> add pm_notifier_count
  63         int ret;
  64         pr_debug("[%s] pm_notifier_count: %u, event = %lu\n", __func__, pm_notifier_count, val);
  65
  66         ret = blocking_notifier_call_chain(&pm_chain_head, val, NULL);
  67
  68         return notifier_to_errno(ret);
  69 }
  70 EXPORT_SYMBOL_GPL(pm_notifier_call_chain);
  71
  72 /* If set, devices may be suspended and resumed asynchronously. */
  73 //<20130327> <marc.huang> disable async suspend/resume, set pm_async_enabled = 0
  74 int pm_async_enabled = 0;
  75
  76 static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr,
  77                              char *buf)
  78 {
  79         return sprintf(buf, "%d\n", pm_async_enabled);
  80 }
  81
  82 static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr,
  83                               const char *buf, size_t n)
  84 {
  85         unsigned long val;
  86
  87         if (kstrtoul(buf, 10, &val))
  88                 return -EINVAL;
  89
  90         if (val > 1)
  91                 return -EINVAL;
  92
  93         pm_async_enabled = val;
  94         return n;
  95 }
  96
  97 power_attr(pm_async);
  98
  99 #ifdef CONFIG_PM_DEBUG
 100 int pm_test_level = TEST_NONE;
 101
 102 static const char * const pm_tests[__TEST_AFTER_LAST] = {
 103         [TEST_NONE] = "none",
 104         [TEST_CORE] = "core",
 105         [TEST_CPUS] = "processors",
 106         [TEST_PLATFORM] = "platform",
 107         [TEST_DEVICES] = "devices",
 108         [TEST_FREEZER] = "freezer",
 109 };
 110
 111 static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr,
 112                                 char *buf)
 113 {
 114         char *s = buf;
 115         int level;
 116
 117         for (level = TEST_FIRST; level <= TEST_MAX; level++)
 118                 if (pm_tests[level]) {
 119                         if (level == pm_test_level)
 120                                 s += sprintf(s, "[%s] ", pm_tests[level]);
 121                         else
 122                                 s += sprintf(s, "%s ", pm_tests[level]);
 123                 }
 124
 125         if (s != buf)
 126                 /* convert the last space to a newline */
 127                 *(s-1) = '\n';
 128
 129         return (s - buf);
 130 }
 131
 132 static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
 133                                 const char *buf, size_t n)
 134 {
 135         const char * const *s;
 136         int level;
 137         char *p;
 138         int len;
 139         int error = -EINVAL;
 140
 141         p = memchr(buf, '\n', n);
 142         len = p ? p - buf : n;
 143
 144         lock_system_sleep();
 145
 146         level = TEST_FIRST;
 147         for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++)
 148                 if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) {
 149                         pm_test_level = level;
 150                         error = 0;
 151                         break;
 152                 }
 153
 154         unlock_system_sleep();
 155
 156         return error ? error : n;
 157 }
 158
 159 power_attr(pm_test);
 160 #endif /* CONFIG_PM_DEBUG */
 161
 162 #ifdef CONFIG_DEBUG_FS
 163 static char *suspend_step_name(enum suspend_stat_step step)
 164 {
 165         switch (step) {
 166         case SUSPEND_FREEZE:
 167                 return "freeze";
 168         case SUSPEND_PREPARE:
 169                 return "prepare";
 170         case SUSPEND_SUSPEND:
 171                 return "suspend";
 172         case SUSPEND_SUSPEND_NOIRQ:
 173                 return "suspend_noirq";
 174         case SUSPEND_RESUME_NOIRQ:
 175                 return "resume_noirq";
 176         case SUSPEND_RESUME:
 177                 return "resume";
 178         default:
 179                 return "";
 180         }
 181 }
 182
 183 static int suspend_stats_show(struct seq_file *s, void *unused)
 184 {
 185         int i, index, last_dev, last_errno, last_step;
 186
 187         last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1;
 188         last_dev %= REC_FAILED_NUM;
 189         last_errno = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1;
 190         last_errno %= REC_FAILED_NUM;
 191         last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1;
 192         last_step %= REC_FAILED_NUM;
 193         seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n"
 194                         "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n",
 195                         "success", suspend_stats.success,
 196                         "fail", suspend_stats.fail,
 197                         "failed_freeze", suspend_stats.failed_freeze,
 198                         "failed_prepare", suspend_stats.failed_prepare,
 199                         "failed_suspend", suspend_stats.failed_suspend,
 200                         "failed_suspend_late",
 201                                 suspend_stats.failed_suspend_late,
 202                         "failed_suspend_noirq",
 203                                 suspend_stats.failed_suspend_noirq,
 204                         "failed_resume", suspend_stats.failed_resume,
 205                         "failed_resume_early",
 206                                 suspend_stats.failed_resume_early,
 207                         "failed_resume_noirq",
 208                                 suspend_stats.failed_resume_noirq);
 209         seq_printf(s,   "failures:\n  last_failed_dev:\t%-s\n",
 210                         suspend_stats.failed_devs[last_dev]);
 211         for (i = 1; i < REC_FAILED_NUM; i++) {
 212                 index = last_dev + REC_FAILED_NUM - i;
 213                 index %= REC_FAILED_NUM;
 214                 seq_printf(s, "\t\t\t%-s\n",
 215                         suspend_stats.failed_devs[index]);
 216         }
 217         seq_printf(s,   "  last_failed_errno:\t%-d\n",
 218                         suspend_stats.errno[last_errno]);
 219         for (i = 1; i < REC_FAILED_NUM; i++) {
 220                 index = last_errno + REC_FAILED_NUM - i;
 221                 index %= REC_FAILED_NUM;
 222                 seq_printf(s, "\t\t\t%-d\n",
 223                         suspend_stats.errno[index]);
 224         }
 225         seq_printf(s,   "  last_failed_step:\t%-s\n",
 226                         suspend_step_name(
 227                                 suspend_stats.failed_steps[last_step]));
 228         for (i = 1; i < REC_FAILED_NUM; i++) {
 229                 index = last_step + REC_FAILED_NUM - i;
 230                 index %= REC_FAILED_NUM;
 231                 seq_printf(s, "\t\t\t%-s\n",
 232                         suspend_step_name(
 233                                 suspend_stats.failed_steps[index]));
 234         }
 235
 236         return 0;
 237 }
 238
 239 static int suspend_stats_open(struct inode *inode, struct file *file)
 240 {
 241         return single_open(file, suspend_stats_show, NULL);
 242 }
 243
 244 static const struct file_operations suspend_stats_operations = {
 245         .open           = suspend_stats_open,
 246         .read           = seq_read,
 247         .llseek         = seq_lseek,
 248         .release        = single_release,
 249 };
 250
 251 static int __init pm_debugfs_init(void)
 252 {
 253         debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO,
 254                         NULL, NULL, &suspend_stats_operations);
 255         return 0;
 256 }
 257
 258 late_initcall(pm_debugfs_init);
 259 #endif /* CONFIG_DEBUG_FS */
 260
 261 #endif /* CONFIG_PM_SLEEP */
 262
 263 #ifdef CONFIG_PM_SLEEP_DEBUG
 264 /*
 265  * pm_print_times: print time taken by devices to suspend and resume.
 266  *
 267  * show() returns whether printing of suspend and resume times is enabled.
 268  * store() accepts 0 or 1.  0 disables printing and 1 enables it.
 269  */
 270 bool pm_print_times_enabled;
 271
 272 static ssize_t pm_print_times_show(struct kobject *kobj,
 273                                    struct kobj_attribute *attr, char *buf)
 274 {
 275         return sprintf(buf, "%d\n", pm_print_times_enabled);
 276 }
 277
 278 static ssize_t pm_print_times_store(struct kobject *kobj,
 279                                     struct kobj_attribute *attr,
 280                                     const char *buf, size_t n)
 281 {
 282         unsigned long val;
 283
 284         if (kstrtoul(buf, 10, &val))
 285                 return -EINVAL;
 286
 287         if (val > 1)
 288                 return -EINVAL;
 289
 290         pm_print_times_enabled = !!val;
 291         return n;
 292 }
 293
 294 power_attr(pm_print_times);
 295
 296 static inline void pm_print_times_init(void)
 297 {
 298         pm_print_times_enabled = !!initcall_debug;
 299 }
 300 #else /* !CONFIG_PP_SLEEP_DEBUG */
 301 static inline void pm_print_times_init(void) {}
 302 #endif /* CONFIG_PM_SLEEP_DEBUG */
 303
 304 struct kobject *power_kobj;
 305 EXPORT_SYMBOL_GPL(power_kobj);
 306
 307 /**
 308  *      state - control system power state.
 309  *
 310  *      show() returns what states are supported, which is hard-coded to
 311  *      'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and
 312  *      'disk' (Suspend-to-Disk).
 313  *
 314  *      store() accepts one of those strings, translates it into the
 315  *      proper enumerated value, and initiates a suspend transition.
 316  */
 317 static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
 318                           char *buf)
 319 {
 320         char *s = buf;
 321 #ifdef CONFIG_SUSPEND
 322         suspend_state_t i;
 323
 324         for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)
 325                 if (pm_states[i].state)
 326                         s += sprintf(s,"%s ", pm_states[i].label);
 327
 328 #endif
 329 #ifdef CONFIG_HIBERNATION
 330         s += sprintf(s, "%s\n", "disk");
 331 #else
 332         if (s != buf)
 333                 /* convert the last space to a newline */
 334                 *(s-1) = '\n';
 335 #endif
 336         return (s - buf);
 337 }
 338
 339 static suspend_state_t decode_state(const char *buf, size_t n)
 340 {
 341 #ifdef CONFIG_SUSPEND
 342         suspend_state_t state = PM_SUSPEND_MIN;
 343         struct pm_sleep_state *s;
 344 #endif
 345         char *p;
 346         int len;
 347
 348         p = memchr(buf, '\n', n);
 349         len = p ? p - buf : n;
 350
 351         /* Check hibernation first. */
 352         if (len == 4 && !strncmp(buf, "disk", len))
 353                 return PM_SUSPEND_MAX;
 354
 355 #ifdef CONFIG_SUSPEND
 356         for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++)
 357                 if (s->state && len == strlen(s->label)
 358                     && !strncmp(buf, s->label, len))
 359                         return s->state;
 360 #endif
 361
 362         return PM_SUSPEND_ON;
 363 }
 364
 365 //<20130327> <marc.huang> merge android kernel 3.0 state_store function
 366 #ifdef CONFIG_MTK_LDVT
 367 static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
 368                            const char *buf, size_t n)
 369 {
 370         suspend_state_t state;
 371         int error;
 372
 373         error = pm_autosleep_lock();
 374         if (error)
 375                 return error;
 376
 377         if (pm_autosleep_state() > PM_SUSPEND_ON) {
 378                 error = -EBUSY;
 379                 goto out;
 380         }
 381
 382         state = decode_state(buf, n);
 383         if (state < PM_SUSPEND_MAX)
 384                 error = pm_suspend(state);
 385         else if (state == PM_SUSPEND_MAX)
 386                 error = hibernate();
 387         else
 388                 error = -EINVAL;
 389
 390  out:
 391         pm_autosleep_unlock();
 392         return error ? error : n;
 393 }
 394 #else //#ifdef CONFIG_MTK_LDVT
 395 static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
 396                const char *buf, size_t n)
 397 {
 398 #ifdef CONFIG_SUSPEND
 399 #ifdef CONFIG_EARLYSUSPEND
 400     suspend_state_t state = PM_SUSPEND_ON;
 401 #else
 402     suspend_state_t state = PM_SUSPEND_STANDBY;
 403 #endif
 404     const char * const *s;
 405 #endif
 406     char *p;
 407     int len;
 408     int error = -EINVAL;
 409
 410     p = memchr(buf, '\n', n);
 411     len = p ? p - buf : n;
 412
 413 #ifdef CONFIG_MTK_HIBERNATION
 414     state = decode_state(buf, n);
 415     hib_log("entry (%d)\n", state);
 416 #endif
 417
 418 #ifdef CONFIG_MTK_HIBERNATION
 419     if (len == 8 && !strncmp(buf, "hibabort", len)) {
 420         hib_log("abort hibernation...\n");
 421         error = mtk_hibernate_abort();
 422         goto Exit;
 423     }
 424 #endif
 425
 426     /* First, check if we are requested to hibernate */
 427     if (len == 4 && !strncmp(buf, "disk", len)) {
 428 #ifdef CONFIG_MTK_HIBERNATION
 429         hib_log("trigger hibernation...\n");
 430 #ifdef CONFIG_EARLYSUSPEND
 431         if (PM_SUSPEND_ON == get_suspend_state()) {
 432             hib_warn("\"on\" to \"disk\" (i.e., 0->4) is not supported !!!\n");
 433             error = -EINVAL;
 434             goto Exit;
 435         }
 436 #endif
 437         if (!pre_hibernate()) {
 438             error = 0;
 439             error = mtk_hibernate();
 440         }
 441 #else // !CONFIG_MTK_HIBERNATION
 442         error = hibernate();
 443 #endif
 444         goto Exit;
 445     }
 446
 447 #ifdef CONFIG_SUSPEND
 448     for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
 449         if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
 450             break;
 451     }
 452     if (state < PM_SUSPEND_MAX && *s) {
 453 #ifdef CONFIG_EARLYSUSPEND
 454         if (state == PM_SUSPEND_ON || valid_state(state)) {
 455             error = 0;
 456             request_suspend_state(state);
 457         } else
 458             error = -EINVAL;
 459 #else
 460         error = enter_state(state);
 461 #endif
 462     }
 463 #endif
 464
 465  Exit:
 466     return error ? error : n;
 467 }
 468 #endif
 469 power_attr(state);
 470
 471 #ifdef CONFIG_PM_SLEEP
 472 /*
 473  * The 'wakeup_count' attribute, along with the functions defined in
 474  * drivers/base/power/wakeup.c, provides a means by which wakeup events can be
 475  * handled in a non-racy way.
 476  *
 477  * If a wakeup event occurs when the system is in a sleep state, it simply is
 478  * woken up.  In turn, if an event that would wake the system up from a sleep
 479  * state occurs when it is undergoing a transition to that sleep state, the
 480  * transition should be aborted.  Moreover, if such an event occurs when the
 481  * system is in the working state, an attempt to start a transition to the
 482  * given sleep state should fail during certain period after the detection of
 483  * the event.  Using the 'state' attribute alone is not sufficient to satisfy
 484  * these requirements, because a wakeup event may occur exactly when 'state'
 485  * is being written to and may be delivered to user space right before it is
 486  * frozen, so the event will remain only partially processed until the system is
 487  * woken up by another event.  In particular, it won't cause the transition to
 488  * a sleep state to be aborted.
 489  *
 490  * This difficulty may be overcome if user space uses 'wakeup_count' before
 491  * writing to 'state'.  It first should read from 'wakeup_count' and store
 492  * the read value.  Then, after carrying out its own preparations for the system
 493  * transition to a sleep state, it should write the stored value to
 494  * 'wakeup_count'.  If that fails, at least one wakeup event has occurred since
 495  * 'wakeup_count' was read and 'state' should not be written to.  Otherwise, it
 496  * is allowed to write to 'state', but the transition will be aborted if there
 497  * are any wakeup events detected after 'wakeup_count' was written to.
 498  */
 499
 500 static ssize_t wakeup_count_show(struct kobject *kobj,
 501                                 struct kobj_attribute *attr,
 502                                 char *buf)
 503 {
 504         unsigned int val;
 505
 506         return pm_get_wakeup_count(&val, true) ?
 507                 sprintf(buf, "%u\n", val) : -EINTR;
 508 }
 509
 510 static ssize_t wakeup_count_store(struct kobject *kobj,
 511                                 struct kobj_attribute *attr,
 512                                 const char *buf, size_t n)
 513 {
 514         unsigned int val;
 515         int error;
 516
 517         error = pm_autosleep_lock();
 518         if (error)
 519                 return error;
 520
 521         if (pm_autosleep_state() > PM_SUSPEND_ON) {
 522                 error = -EBUSY;
 523                 goto out;
 524         }
 525
 526         error = -EINVAL;
 527         if (sscanf(buf, "%u", &val) == 1) {
 528                 if (pm_save_wakeup_count(val))
 529                         error = n;
 530         }
 531
 532  out:
 533         pm_autosleep_unlock();
 534         return error;
 535 }
 536
 537 power_attr(wakeup_count);
 538
 539 #ifdef CONFIG_PM_AUTOSLEEP
 540 static ssize_t autosleep_show(struct kobject *kobj,
 541                               struct kobj_attribute *attr,
 542                               char *buf)
 543 {
 544         suspend_state_t state = pm_autosleep_state();
 545
 546         if (state == PM_SUSPEND_ON)
 547                 return sprintf(buf, "off\n");
 548
 549 #ifdef CONFIG_SUSPEND
 550         if (state < PM_SUSPEND_MAX)
 551                 return sprintf(buf, "%s\n", pm_states[state].state ?
 552                                         pm_states[state].label : "error");
 553 #endif
 554 #ifdef CONFIG_HIBERNATION
 555         return sprintf(buf, "disk\n");
 556 #else
 557         return sprintf(buf, "error");
 558 #endif
 559 }
 560
 561 static ssize_t autosleep_store(struct kobject *kobj,
 562                                struct kobj_attribute *attr,
 563                                const char *buf, size_t n)
 564 {
 565         suspend_state_t state = decode_state(buf, n);
 566         int error;
 567
 568     hib_log("store autosleep_state(%d)\n", state);
 569         if (state == PM_SUSPEND_ON
 570             && strcmp(buf, "off") && strcmp(buf, "off\n"))
 571                 return -EINVAL;
 572
 573         error = pm_autosleep_set_state(state);
 574         return error ? error : n;
 575 }
 576
 577 power_attr(autosleep);
 578 #endif /* CONFIG_PM_AUTOSLEEP */
 579
 580 #ifdef CONFIG_PM_WAKELOCKS
 581 static ssize_t wake_lock_show(struct kobject *kobj,
 582                               struct kobj_attribute *attr,
 583                               char *buf)
 584 {
 585         return pm_show_wakelocks(buf, true);
 586 }
 587
 588 static ssize_t wake_lock_store(struct kobject *kobj,
 589                                struct kobj_attribute *attr,
 590                                const char *buf, size_t n)
 591 {
 592         int error = pm_wake_lock(buf);
 593         return error ? error : n;
 594 }
 595
 596 power_attr(wake_lock);
 597
 598 static ssize_t wake_unlock_show(struct kobject *kobj,
 599                                 struct kobj_attribute *attr,
 600                                 char *buf)
 601 {
 602         return pm_show_wakelocks(buf, false);
 603 }
 604
 605 static ssize_t wake_unlock_store(struct kobject *kobj,
 606                                  struct kobj_attribute *attr,
 607                                  const char *buf, size_t n)
 608 {
 609         int error = pm_wake_unlock(buf);
 610         return error ? error : n;
 611 }
 612
 613 power_attr(wake_unlock);
 614
 615 #endif /* CONFIG_PM_WAKELOCKS */
 616 #endif /* CONFIG_PM_SLEEP */
 617
 618 #ifdef CONFIG_PM_TRACE
 619 int pm_trace_enabled;
 620
 621 static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr,
 622                              char *buf)
 623 {
 624         return sprintf(buf, "%d\n", pm_trace_enabled);
 625 }
 626
 627 static ssize_t
 628 pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr,
 629                const char *buf, size_t n)
 630 {
 631         int val;
 632
 633         if (sscanf(buf, "%d", &val) == 1) {
 634                 pm_trace_enabled = !!val;
 635                 return n;
 636         }
 637         return -EINVAL;
 638 }
 639
 640 power_attr(pm_trace);
 641
 642 static ssize_t pm_trace_dev_match_show(struct kobject *kobj,
 643                                        struct kobj_attribute *attr,
 644                                        char *buf)
 645 {
 646         return show_trace_dev_match(buf, PAGE_SIZE);
 647 }
 648
 649 static ssize_t
 650 pm_trace_dev_match_store(struct kobject *kobj, struct kobj_attribute *attr,
 651                          const char *buf, size_t n)
 652 {
 653         return -EINVAL;
 654 }
 655
 656 power_attr(pm_trace_dev_match);
 657
 658 #endif /* CONFIG_PM_TRACE */
 659
 660 #ifdef CONFIG_FREEZER
 661 static ssize_t pm_freeze_timeout_show(struct kobject *kobj,
 662                                       struct kobj_attribute *attr, char *buf)
 663 {
 664         return sprintf(buf, "%u\n", freeze_timeout_msecs);
 665 }
 666
 667 static ssize_t pm_freeze_timeout_store(struct kobject *kobj,
 668                                        struct kobj_attribute *attr,
 669                                        const char *buf, size_t n)
 670 {
 671         unsigned long val;
 672
 673         if (kstrtoul(buf, 10, &val))
 674                 return -EINVAL;
 675
 676         freeze_timeout_msecs = val;
 677         return n;
 678 }
 679
 680 power_attr(pm_freeze_timeout);
 681
 682 #endif  /* CONFIG_FREEZER*/
 683
 684 static struct attribute * g[] = {
 685         &state_attr.attr,
 686 #ifdef CONFIG_PM_TRACE
 687         &pm_trace_attr.attr,
 688         &pm_trace_dev_match_attr.attr,
 689 #endif
 690 #ifdef CONFIG_PM_SLEEP
 691         &pm_async_attr.attr,
 692         &wakeup_count_attr.attr,
 693 #ifdef CONFIG_PM_AUTOSLEEP
 694         &autosleep_attr.attr,
 695 #endif
 696 #ifdef CONFIG_PM_WAKELOCKS
 697         &wake_lock_attr.attr,
 698         &wake_unlock_attr.attr,
 699 #endif
 700 #ifdef CONFIG_PM_DEBUG
 701         &pm_test_attr.attr,
 702 #endif
 703 #ifdef CONFIG_PM_SLEEP_DEBUG
 704         &pm_print_times_attr.attr,
 705 #endif
 706 #endif
 707 #ifdef CONFIG_FREEZER
 708         &pm_freeze_timeout_attr.attr,
 709 #endif
 710         NULL,
 711 };
 712
 713 static struct attribute_group attr_group = {
 714         .attrs = g,
 715 };
 716
 717 #ifdef CONFIG_PM_RUNTIME
 718 struct workqueue_struct *pm_wq;
 719 EXPORT_SYMBOL_GPL(pm_wq);
 720
 721 static int __init pm_start_workqueue(void)
 722 {
 723         pm_wq = alloc_workqueue("pm", WQ_FREEZABLE, 0);
 724
 725         return pm_wq ? 0 : -ENOMEM;
 726 }
 727 #else
 728 static inline int pm_start_workqueue(void) { return 0; }
 729 #endif
 730
 731 static int __init pm_init(void)
 732 {
 733         int error = pm_start_workqueue();
 734         if (error)
 735                 return error;
 736         hibernate_image_size_init();
 737         hibernate_reserved_size_init();
 738         power_kobj = kobject_create_and_add("power", NULL);
 739         if (!power_kobj)
 740                 return -ENOMEM;
 741         error = sysfs_create_group(power_kobj, &attr_group);
 742         if (error)
 743                 return error;
 744         pm_print_times_init();
 745         return pm_autosleep_init();
 746 }
 747
 748 core_initcall(pm_init);